US3760692A — Axial piston type machine

Claim 1

Independent Claim 178 words

In an axial piston-type machine comprising a main frame, a drive shaft mounted in said frame for rotation about an axis, a drive flange attached to said shaft and rotatable therewith, a frame pivotable with respect to the drive shaft about an axis, a cylinder block mounted in said pivotable frame for rotation about an axis intersecting the axis of the drive shaft, axial pistons mounted in cylinders in the cylinder block, first connecting means between the drive flange and the pistons, and second connecting means rotatably connecting said flange and said cylinder block, the improvement comprising: in all positions of pivotal movement said pivotal axis being outside the axes of rotation of the shaft and the cylinder block; and said second connecting means comprising two toothed members, a first connected to the cylinder block for rotation therewith and a second connected to the drive flange for rotation therewith, the teeth of said members engaging each other at a point of mesh, said point being located on the plane bisecting the angle between the two axes of rotation.

Claim 2

Dependent Claim 178 words

In an axial piston-type machine comprising a main frame, a drive shaft mounted in said frame for rotation about an axis, a drive flange attached to said shaft and rotatable therewith, a frame pivotable with respect to the drive shaft about an axis, a cylinder block mounted in said pivotable frame for rotation about an axis intersecting the axis of the drive shaft, axial pistons mounted in cylinders in the cylinder block, first connecting means between the drive flange and the pistons, and second connecting means rotatably connecting said flange and said cylinder block, the improvement comprising: in all positions of pivotal movement said pivotal axis being outside the axes of rotation of the shaft and the cylinder block; and said second connecting means comprising two toothed members, a first connected to the cylinder block for rotation therewith and a second connected to the drive flange for rotation therewith, the teeth of said members engaging each other at a point of mesh, said point being located on the plane bisecting the angle between the two axes of rotation.

Claim 3

Dependent Claim 55 words

In a machine as set forth in claim 1, wherein each of said members has a toroidal surface, said teeth extending from the respective surfaces, and including means connecting said frames for providing said pivotal movement of the pivotal frame and a rolling movement of the toroidal surfaces on each other during said pivotal movement.

Claim 4

Dependent Claim 30 words

In a machine as set forth in claim 1, including gearing means interconnecting the frames and controlling the pivotal position of the pivotal frame with respect to the main frame.

Claim 5

Dependent Claim 84 words

In a machine as set forth in claim 3, wherein said surface of the first member is formed about a first center and said surface of the second member is formed about a second center, and said gearing means is an angle bisecting mechanism by which - in a section along a tangential plane - the first center is pivotable about the second center through an angle which is at least approximately equal to one-half the total angle of pivot of the pivotal frame.

Claim 6

Dependent Claim 51 words

In a machine as set forth in claim 4, wherein said means for providing said pivotal movement includes a side bar articulated to the main frame and to the pivotal frame, and said gearing means includes two pinions of equal size and each having teeth positioned coaxial with the respective centers.

Claim 7

Dependent Claim 73 words

In a machine as set forth in claim 5, wherein said gearing means includes two trunnions with each pinion being mounted on a respective trunnion, said pinions having teeth only on a portion of their peripheries with the remainder of the peripheries being cylindrical, said side bar fitting over the two pinions, said trunnions, pinions and side bar defining part of an oil passageway communicating between said cylinder block and said main frame.

Claim 8

Dependent Claim 59 words

In a machine as set forth in claim 1, wherein said first connecting means includes piston rods articulated to said flange in a plane, and said cylinder block axis intersects the drive shaft axis at a point which, at time of maximum pivot of the pivotable frame is positioned at the cylinder block side of the last mentioned plane.

Claim 9

Dependent Claim 26 words

In a machine as set forth in claim 7, wherein the side of said flange adjacent the cylinder block has a surface which is spherically convex.

Claim 10

Dependent Claim 86 words

In a machine as set forth in claim 8, wherein said first connecting means includes spherical mounts on each of the piston rods and the flange has spherical sockets therein, said sockets each having an axis that is normal to said convex surface and an enlargement extending from the equator of the sphere of the mount, and including a bearing metal ring for each socket and receivable in the enlargement of the respective socket, each ring having an opening larger in diameter than the respective piston.

Claim 11

Dependent Claim 59 words

In a machine as set forth in claim 9, wherein each piston is a sheet metal body of cylindrical basic shape and having a pair of rolled-up corrugations defining a semicylindrical socket at the interior of the body and a flanged rim at the base of said socket, each piston rod having a ball received in the respective socket.

Claim 12

Dependent Claim 48 words

In a machine as set forth in claim 1, wherein said second connecting means comprises a bevel beamed joint (known per se) having two cones, one cone being on the flange and the other cone being on the cylinder block, said pivotable axis being located in said plane.

Claim 13

Dependent Claim 29 words

An axial piston-type machine as claimed in claim 11, characterized in that the bevel beamed joint is a cylinder beamed joint, i.e., the cone apex is in the infinite.

Claim 14

Dependent Claim 52 words

An axial piston-type machine as claimed in claim 12, characterized in that the pivotal axis is displaced laterally with respect to the flange axis so that the inner dead center position of the pistons remains approximately unchanged in all pivotal positions of the pivotable frame for minimum dead volume in the cylinders.

Claim 15

Dependent Claim 38 words

In a machine as set forth in claim 13, wherein the teeth on the flange define a circle positioned relatively close to said first connecting means at the flange, said pivotal axis being substantially tangential to said circle.

Claim 16

Dependent Claim 44 words

In a machine as set forth in claim 14, including a pair of spaced trunnions mounted on said pivotable axis and forming the pivotal mount, said machine defining passageways for oil communication to said cylinder block, part of said passageways being in said trunnions.

Claim 17

Dependent Claim 31 words

In a machine as set forth in claim 11, wherein the teeth are weakly tapering with the tooth flanks being increasingly inclined with respect to each other towards the distal ends.

Claim 18

Dependent Claim 33 words

An axial piston-type machine as claimed in claim 11, characterized in that the generating angle of the cones of the bevel beamed joint is an obtuse angle, such as for example of 120*.

Claim 19

Dependent Claim 22 words

An axial piston-type machine as claimed in claim 1, characterized in that the bevel beamed joint is a bevel beamed edge joint.

Claim 20

Dependent Claim 124 words

In an axial piston-type machine comprising a bearing member, a drive shaft having a drive flange and mounted in said bearing member, a pivotable frame pivotable with respect to said drive shaft, a cylinder block mounted in said pivotable frame, axial pistons slideable in said cylinder block, and piston rods pivotably connecting said drive flange and said pistons, and drive connection means between said drive flange and said cylinder block, the improvement comprising: said bearing member having a fluid connection; said pivotable frame having a fluid passage; side bars connecting said pivotable frame with said bearing member, at least one of said side bars having a fluid passage between the fluid connection provided on the bearing member and said passage in the pivotable frame.

Claim 21

Dependent Claim 124 words

In an axial piston-type machine comprising a bearing member, a drive shaft having a drive flange and mounted in said bearing member, a pivotable frame pivotable with respect to said drive shaft, a cylinder block mounted in said pivotable frame, axial pistons slideable in said cylinder block, and piston rods pivotably connecting said drive flange and said pistons, and drive connection means between said drive flange and said cylinder block, the improvement comprising: said bearing member having a fluid connection; said pivotable frame having a fluid passage; side bars connecting said pivotable frame with said bearing member, at least one of said side bars having a fluid passage between the fluid connection provided on the bearing member and said passage in the pivotable frame.

Claim 22

Dependent Claim 47 words

In an axial piston-type machine as claimed in claim 19, wherein said bearing member having fluid connection ports for high and low pressure fluid in a plane surface thereon, said bearing member with said plane surface being affixed to another plane surface provided with corresponding connection ports.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-09-24	1977-03-26	1977-09-25	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-09-24	1981-03-26	1981-09-25	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-09-24	1985-03-26	1985-09-25	$7700.00	Window Closed / Lapsed

Axial piston type machine

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