Starter motors

Claim 2

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, third and fourth electromagnet poles, the third and fourth poles being spaced from the first and second poles in said plane and magnetically connected to the first and second poles by said member, and those portions of the poles presented to the armature being stepped, the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 3

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, a second electromagnet winding, both windings encircling respective poles, a third electromagnet winding, and those portions of the poles presented to the armature being stepped, the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 4

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, a second electromagnet winding, both windings encircling respective poles, a third electromagnet winding, and those portions of the poles presented to the armature being stepped, the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 5

A starter motor as claimed in claim 2, in which the third electromagnet winding encircles said member.

Claim 6

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the eleectromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, wherein the member magnetically interconnecting the poles is arcuate and coaxial with the shaft, and wherein said member is a complete cylinder, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 7

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the eleectromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, wherein the member magnetically interconnecting the poles is arcuate and coaxial with the shaft, and wherein said member is a complete cylinder, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 8

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and a electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein the armature and the poles have associated therewith a non-magnetic spacer which prevents physical contact between the armature and poles and so facilitates movement of the armature away from the poles when the electromagnet is de-energized, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 9

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and a electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein the armature and the poles have associated therewith a non-magnetic spacer which prevents physical contact between the armature and poles and so facilitates movement of the armature away from the poles when the electromagnet is de-energized, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 10

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and en electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein the armature is guided for movement parallel to said shaft by said poles through the intermediary of a non-magnetic spacer, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 11

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and en electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein the armature is guided for movement parallel to said shaft by said poles through the intermediary of a non-magnetic spacer, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 12

A starter motor as claimed in claim 6, wherein the non-magnetic member is a sleeve carried by the armature and engaging the poles.

Claim 13

A starter motor for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein said shaft is a secondary shaft driven by the rotor shaft of the starter motor, and wherein the secondary shaft is driven by the rotor shaft through an epicyclie gear train, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 14

A starter motor for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein said shaft is a secondary shaft driven by the rotor shaft of the starter motor, and wherein the secondary shaft is driven by the rotor shaft through an epicyclie gear train, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 15

A starter motor, for an internal combustion, engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, wherein said shaft is a secondary shaft driven by the rotor shaft of the starter motor, and wherein the field arrangement of the starter motor is a permanent magnet arrangement those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 16

A starter motor, for an internal combustion, engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, wherein said shaft is a secondary shaft driven by the rotor shaft of the starter motor, and wherein the field arrangement of the starter motor is a permanent magnet arrangement those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 17

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft and wherein there is provided a set of electrical contacts controlling energization of the starter motor, the contacts being operated when the armature moves to a predetermined position relative to the remainder of the starter motor, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 18

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft and wherein there is provided a set of electrical contacts controlling energization of the starter motor, the contacts being operated when the armature moves to a predetermined position relative to the remainder of the starter motor, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 19

A starter motor as claimed in claim 10, wherein said set of electrical contacts includes a fixed contact carried by the casing and a movable contact carried by the armature and engageable with the fixed contact.

Claim 20

A starter motor of an internal combustion engine comprising in combination a casing including a cylindrical main portion housing the motor field assembly, a yoke coaxial with the main portion, and an end bracket, the yoke being positioned between the end bracket and the casing main portion, a rotor shaft journalled for rotation in the casing main portion and the end bracket and extending through the yoke, a pair of electromagnet poles carried by the yoke and extending generally diametrically opposite one another towards the rotor shaft, an electromagnet winding encircling each of the poles, a pinion gear wheel carried by the rotor shaft and rotatable therewith, the pinion gear wheel being movable axially relative to the rotor shaft and having an electromagnet armature coupled thereto, a non-magnetic sleeve carried by the armature and slidably engaging said poles so as to guide the armature for movement relative to the poles in a direction parallel to the shaft and resilient means urging the armature and the pinion to a rest position wherein the armature is spaced from the poles, said windings when energized inducing a flow of magnetic flux from one of the poles to the armature across the air gap, through the armature in a direction transverse to the shaft, from the armature back to the other pole, and from the other pole circumferentially within the yoke back to said one pole, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 21

A starter motor of an internal combustion engine comprising in combination a casing including a cylindrical main portion housing the motor field assembly, a yoke coaxial with the main portion, and an end bracket, the yoke being positioned between the end bracket and the casing main portion, a rotor shaft journalled for rotation in the casing main portion and the end bracket and extending through the yoke, a pair of electromagnet poles carried by the yoke and extending generally diametrically opposite one another towards the rotor shaft, an electromagnet winding encircling each of the poles, a pinion gear wheel carried by the rotor shaft and rotatable therewith, the pinion gear wheel being movable axially relative to the rotor shaft and having an electromagnet armature coupled thereto, a non-magnetic sleeve carried by the armature and slidably engaging said poles so as to guide the armature for movement relative to the poles in a direction parallel to the shaft and resilient means urging the armature and the pinion to a rest position wherein the armature is spaced from the poles, said windings when energized inducing a flow of magnetic flux from one of the poles to the armature across the air gap, through the armature in a direction transverse to the shaft, from the armature back to the other pole, and from the other pole circumferentially within the yoke back to said one pole, those portions of the poles presented to the armature being stepped, and the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 22

A starter motor for an internal combustion engine, comprising in combination: a casing including a cylindrical main portion, a yoke portion, and an end portion, the yoke portion being positioned between the end portion and the casing main portion, an electric motor having an armature and a field assembly with poles disposed in said casing main portion, a shaft journalled for rotation by said electric motor in the end portion and extending through the yoke portion, a separate pair of electromagnet poles carried by the yoke portion and extending generally diametrically opposite one another towards the shaft, a separate electromagnet winding encircling at least one of the separate poles, a pinion gear wheel carried by the shaft and rotatable therewith, the pinion gear wheel being movable axially relative to the shaft and having a separate electromagnet armature coupled thereto, means for guiding the separate armature for movement relative to the separate poles in a direction parallel to the shaft, said separate armature entering an area between said separate poles as said separate armature moves the pinion towards an operative position, resilient means urging the separate armature and the pinion to a rest position wherein the separate armature is spaced from the separate poles, said separate electromagnet winding when energized inducing a flow of magnetic flux from one of the separate poles to the separate armature across an air gap, through the separate armature in a direction transverse to the shaft, from the separate armature back to the other separate pole, and from the other separate pole circumferentially within the yoke portion back to said one separate pole so as to attract said separate armature and effect a controlled movement of said separate armature in said direction parallel to said shaft, those portions of the separate poles presented to the separate armature being stepped, and the periphery of the separate armature being shaped to mate with the stepped form of the separate poles.

Claim 23

A starter motor for an internal combustion engine, comprising in combination: a casing including a cylindrical main portion, a yoke portion, and an end portion, the yoke portion being positioned between the end portion and the casing main portion, an electric motor having an armature and a field assembly with poles disposed in said casing main portion, a shaft journalled for rotation by said electric motor in the end portion and extending through the yoke portion, a separate pair of electromagnet poles carried by the yoke portion and extending generally diametrically opposite one another towards the shaft, a separate electromagnet winding encircling at least one of the separate poles, a pinion gear wheel carried by the shaft and rotatable therewith, the pinion gear wheel being movable axially relative to the shaft and having a separate electromagnet armature coupled thereto, means for guiding the separate armature for movement relative to the separate poles in a direction parallel to the shaft, said separate armature entering an area between said separate poles as said separate armature moves the pinion towards an operative position, resilient means urging the separate armature and the pinion to a rest position wherein the separate armature is spaced from the separate poles, said separate electromagnet winding when energized inducing a flow of magnetic flux from one of the separate poles to the separate armature across an air gap, through the separate armature in a direction transverse to the shaft, from the separate armature back to the other separate pole, and from the other separate pole circumferentially within the yoke portion back to said one separate pole so as to attract said separate armature and effect a controlled movement of said separate armature in said direction parallel to said shaft, those portions of the separate poles presented to the separate armature being stepped, and the periphery of the separate armature being shaped to mate with the stepped form of the separate poles.

Claim 24

A starter motor as claimed in claim 13, wherein said separate pair of poles lie in a common plane transverse to the axis of said shaft.

Claim 25

A starter motor as claimed in claim 13, wherein said separate poles extend radially towards said shaft.

Claim 26

A starter motor as claimed in claim 15, wherein the separate poles present part cylindrical surfaces to the shaft and the separate armature includes a part cylindrical portion which can be received between the poles.

Claim 27

A starter motor as claimed in claim 13, wherein there is provided an electromagnet winding for each electromagnet pole.

Claim 28

A starter motor as claimed in claim 13, wherein there are provided third and fourth electromagnetic windings and two pair of separate poles, where all four windings encircle respective poles.

Claim 29

A starter motor as claimed in claim 13, further including a member magnetically interconnecting the separate poles the member being arcuate and coaxial with the shaft.

Claim 30

A starter motor as claimed in claim 19, wherein said member is a part of a cylinder.

Claim 31

A starter motor as claimed in claim 13, wherein the separate armature is carried by a part moving with the pinion gear wheel so that the separate armature is guided for movement parallel with the shaft, by the pinion and said part.

Claim 32

A starter motor as claimed in claim 13, wherein a part is provided for magnetically interconnecting the separate poles, the part being a portion of the casing of the starter motor.

Claim 33

A starter motor as claimed in claim 22, wherein the member is an integral portion of the casing.

Claim 34

A starter motor as claimed in claim 22, wherein said member is a part constituting a portion of the starter motor casing when secured to the remainder of the casing.

Claim 35

A starter motor as claimed in claim 13, wherein a member is provided for magnetically interconnecting the separate poles and includes a separate component secured to the casing of the starter motor.

Claim 36

A starter motor as claimed in claim 25, wherein the component is secured to the casting by the fastening device which secure the poles to the member.

Claim 37

A starter motor as claimed in claim 13, wherein that region of the casing of the starter motor adjacent the separate poles is non-magnetic material and includes a member magnetically interconnecting the separate poles, the member being a separate component secured to the casing.

Claim 38

A starter motor as claimed in claim 27, wherein at least one of the poles is integral with said member which magnetically interconnects the poles.

Claim 39

A starter motor as claimed in claim 13, wherein said shaft is the rotor shaft of the electric motor.

Claim 40

A starter motor as claimed in claim 13, wherein said shaft is a secondary shaft driven by the rotor shaft of the electric motor.

Claim 41

A starter motor as claimed in claim 30, wherein the secondary shaft is driven by said rotor shaft through gear wheels.

Claim 42

A starter motor as claimed in claim 13, wherein said yoke is trapped in position by the end portion and the casing main portion.

Claim 43

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnetic, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and those portions of the poles presented to the armature are stepped, the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 44

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnetic, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and those portions of the poles presented to the armature are stepped, the periphery of the armature being shaped to mate with the stepped form of the poles.

Claim 45

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and said armature is of frusto-conical form, said poles being of mating frusto-conical form.

Claim 46

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and said armature is of frusto-conical form, said poles being of mating frusto-conical form.

Claim 47

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, with the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, third and fourth electromagnet poles, the third and fourth poles being spaced from the first and second poles in said plane, and being magnetically connected to the first and second poles by said member, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 48

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, with the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, third and fourth electromagnet poles, the third and fourth poles being spaced from the first and second poles in said plane, and being magnetically connected to the first and second poles by said member, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 49

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, a second electromagnet winding, both windings encircling respective poles, and, a third electromagnet winding, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 50

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, a second electromagnet winding, both windings encircling respective poles, and, a third electromagnet winding, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 51

A starter motor as claimed in claim 36 in which the third electromagnet winding encircles said member.

Claim 52

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically intercommenting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, the member magnetically interconnecting the poles being arcuate and coaxial with the shaft, and said member being a complete cylinder, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 53

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically intercommenting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, the member magnetically interconnecting the poles being arcuate and coaxial with the shaft, and said member being a complete cylinder, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 54

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein the armature and the poles have associated therewith a nonmagnetic spacer which prevents physical contact between the armature and the poles and so facilitates movement of the armature away from the poles when the electromagnet is de-energized, the armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 55

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein the armature and the poles have associated therewith a nonmagnetic spacer which prevents physical contact between the armature and the poles and so facilitates movement of the armature away from the poles when the electromagnet is de-energized, the armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 56

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first and second poles lie in a common plane transverse to the axis of said shaft, and wherein the armature is guided for movement parallel to said shaft by said poles through the intermediary of a non-magnetic member, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 57

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first and second poles lie in a common plane transverse to the axis of said shaft, and wherein the armature is guided for movement parallel to said shaft by said poles through the intermediary of a non-magnetic member, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 58

A starter motor as claimed in claim 40 wherein the non-magnetic member is a sleeve carried by the armature and engaging the poles.

Claim 59

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein said shaft is a secondary shaft driven by the rotor shaft of the starter motor, the secondary shaft being driven by the rotor shaft through an epicyclic gear train, and said armature being of frusto-conical form, said poles being of mating frusto-conical form.

Claim 60

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein said shaft is a secondary shaft driven by the rotor shaft of the starter motor, the secondary shaft being driven by the rotor shaft through an epicyclic gear train, and said armature being of frusto-conical form, said poles being of mating frusto-conical form.

Claim 61

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, wherein said shaft is a secondary shaft driven by the rotor shaft of the starter motor, the field arrangement of the starter motor being a permanent magnet arrangement, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 62

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, wherein said shaft is a secondary shaft driven by the rotor shaft of the starter motor, the field arrangement of the starter motor being a permanent magnet arrangement, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 63

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein there is provided a set of electrical contacts controlling energization of the starter motor, the contacts being operated when the armature moves to a predetermined position relative to the remainder of the starter motor, the armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 64

A starter motor, for an internal combustion engine, comprising an electric motor, a shaft rotated by said motor, a pinion gear wheel carried by said shaft, the pinion gear wheel being rotated with the shaft, and being axially movable relative thereto between an operative position and a rest position, and an electromagnet comprising an armature coupled to the pinion gear wheel and guided for movement parallel to the shaft, first and second electromagnet poles spaced apart around said shaft, the first and second poles being spaced from the armature in the rest position thereof in the direction of movement of the armature, a member magnetically interconnecting the first and second poles, and an electromagnet winding which when energized induces a flow of magnetic flux in the flux path of the electromagnet, the flux path of the electromagnet being from the first pole to the armature, within the armature laterally relative to said shaft, from the armature to the second pole, and from the second pole within said member back to the first pole, wherein said first and second poles lie in a common plane transverse to the axis of said shaft, and wherein there is provided a set of electrical contacts controlling energization of the starter motor, the contacts being operated when the armature moves to a predetermined position relative to the remainder of the starter motor, the armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 65

A starter motor as claimed in claim 44, wherein said set of electrical contacts includes a fixed contact carried by the casing and a movable contact carried by the armature and engageable with the fixed contact.

Claim 66

A starter motor for an internal combustion engine comprising in combination a casing including a cylindrical main portion housing the motor field assembly, a yoke co-axial with the main portion, and an end bracket, the yoke being positioned between the end bracket and the casing main portion, a rotor shaft journalled for rotation in the casing main portion and the end bracket and extending through the yoke, a pair of electromagnet poles carried by the yoke and extending generally diametrically opposite one another towards the rotor shaft, an electromagnet winding encircling each of the poles, a pinion gear wheel carried by the rotor shaft and rotatable therewith, the pinion gear wheel being movable axially relative to the rotor shaft and having an electromagnet armature coupled thereto, a non-magnetic sheelve carried by the armature and slidably engaging said pole so as to guide the armature for movement relative to the poles in a direction parallel to the shaft and resilient means urging the armature and the pinion to a rest position wherein the armature is spaced from the poles, said windings when energized inducing a flow of magnetic flux from one of the poles to the armature across the air gap, through the armature in a direction transverse to the shaft, from the armature back to the other pole, and from the other pole circumferentially within the yoke back to said one pole, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 67

A starter motor for an internal combustion engine comprising in combination a casing including a cylindrical main portion housing the motor field assembly, a yoke co-axial with the main portion, and an end bracket, the yoke being positioned between the end bracket and the casing main portion, a rotor shaft journalled for rotation in the casing main portion and the end bracket and extending through the yoke, a pair of electromagnet poles carried by the yoke and extending generally diametrically opposite one another towards the rotor shaft, an electromagnet winding encircling each of the poles, a pinion gear wheel carried by the rotor shaft and rotatable therewith, the pinion gear wheel being movable axially relative to the rotor shaft and having an electromagnet armature coupled thereto, a non-magnetic sheelve carried by the armature and slidably engaging said pole so as to guide the armature for movement relative to the poles in a direction parallel to the shaft and resilient means urging the armature and the pinion to a rest position wherein the armature is spaced from the poles, said windings when energized inducing a flow of magnetic flux from one of the poles to the armature across the air gap, through the armature in a direction transverse to the shaft, from the armature back to the other pole, and from the other pole circumferentially within the yoke back to said one pole, said armature being of frusto-conical form, and said poles being of mating frusto-conical form.

Claim 68

A starter motor for an internal combustion engine, comprising in combination: a casing including a cylindrical main portion, a yoke portion, and an end portion, the yoke portion being positioned between the end portion and the casing main portion, an electric motor having an armature and a field assembly with poles disposed in said casing main portion, a shaft journalled for rotation by said electric motor in the end portion and extending through the yoke portion, a separate pair of electromagnet poles carried by the yoke portion and extending generally diametrically opposite one another towards the shaft, a separate electromagnet winding encircling at least one of the separate poles, a pinion gear wheel carried by the shaft and rotatable therewith, the pinion gear wheel being movable axially relative to the shaft and having a separate electromagnet armature coupled thereto, means for guiding the separate armature for movement relative to the separate poles in a direction parallel to the shaft, said separate armature entering an area between said separate poles as said separate poles as said separate armature moves the pinion towards an operative position, resilient means urging the separate armature and the pinion to a rest position wherein the separate armature is spaced from the separate poles, said separate electromagnet winding when energized inducing a flow of magnetic flux from one of the separate poles to the separate armature across an air gap, through the separate armature in a direction transverse to the shaft, from the separate armature back to the other separate pole, and from the other separate pole circumferentially within the yoke portion back to said one separate pole so as to attract said separate armature and effect a controlled movement of said separate armature in said direction parallel to said shaft, said separate armature being of frusto-conical form, and those portions of said separate poles presented to said separate armature being of mating frusto-conical form.

Claim 69

A starter motor for an internal combustion engine, comprising in combination: a casing including a cylindrical main portion, a yoke portion, and an end portion, the yoke portion being positioned between the end portion and the casing main portion, an electric motor having an armature and a field assembly with poles disposed in said casing main portion, a shaft journalled for rotation by said electric motor in the end portion and extending through the yoke portion, a separate pair of electromagnet poles carried by the yoke portion and extending generally diametrically opposite one another towards the shaft, a separate electromagnet winding encircling at least one of the separate poles, a pinion gear wheel carried by the shaft and rotatable therewith, the pinion gear wheel being movable axially relative to the shaft and having a separate electromagnet armature coupled thereto, means for guiding the separate armature for movement relative to the separate poles in a direction parallel to the shaft, said separate armature entering an area between said separate poles as said separate poles as said separate armature moves the pinion towards an operative position, resilient means urging the separate armature and the pinion to a rest position wherein the separate armature is spaced from the separate poles, said separate electromagnet winding when energized inducing a flow of magnetic flux from one of the separate poles to the separate armature across an air gap, through the separate armature in a direction transverse to the shaft, from the separate armature back to the other separate pole, and from the other separate pole circumferentially within the yoke portion back to said one separate pole so as to attract said separate armature and effect a controlled movement of said separate armature in said direction parallel to said shaft, said separate armature being of frusto-conical form, and those portions of said separate poles presented to said separate armature being of mating frusto-conical form.

Claim 70

A starter motor as claimed in claim 47 wherein said separate pair of poles lie in a common plane transverse to the axis of the shaft.

Claim 71

A starter motor as claimed in claim 47 wherein said separate poles extend radially towards said shaft.

Claim 72

A starter motor as claimed in claim 47 wherein there is provided an electromagnet winding for each electromagnet pole.

Claim 73

A starter motor as claimed in claim 47 wherein there are provided third and fourth electromagnet windings and two pairs of separate poles, where all four windings encircle respective poles.

Claim 74

A starter motor as claimed in claim 47, further including a member magnetically interconnecting the separate poles the member being arcuate and coaxial with the shaft.

Claim 75

A starter motor as claimed in claim 52 wherein said member is a part of a cylinder.

Claim 76

A starter motor as claimed in claim 47 wherein the separate armature is carried by a part moving with the pinion gear wheel so that the separate armature is guided for movement parallel to the shaft by the pinion and said part.

Claim 77

A starter motor as claimed in claim 47 wherein a part is provided magnetically interconnecting the separate poles, the part being a portion of the casing of the starter motor.

Claim 78

A starter motor as claimed in claim 55, wherein the member is an integral portion of the casing.

Claim 79

A starter motor as claimed in claim 55 wherein said member is a part constituting a portion of the starter motor casing when secured to the remainder of the casing.

Claim 80

A starter motor as claimed in claim 47 wherein a member is provided for magnetically interconnecting the separate poles and includes a separate component secured to the casing of the starter motor.

Claim 81

A starter motor as claimed in claim 58 wherein the component is secured to the casing by the fastening devices which secure the poles to the member.

Claim 82

A starter motor as claimed in claim 47 wherein that region of the casing of the starter motor adjacent the separate poles is non-magnetic material and includes a member magnetically interconnecting the separate poles, the member being a separate component secured to the casing.