US4262224A — Oil cooling for an electrical generator

Claim 1

Independent Claim 372 words

Oil cooled electric generator and rectifier combination for association with an engine having a pressurized lubrication circuit (37, 38, 39) comprising a generator housing (12); a stator housing (27) located within said generator housing; a stator including an armature core (16) and an armature winding (15) and further including an exciter core (14) and a field winding on the exciter core, the exciter core being spaced from the armature core leaving a gap, the stator being positioned within the stator housing (27); a bearing (22) mounted within the generator housing (12); a shaft (18, 55) rotatable in the bearing; a claw-pole rotor (17) mounted on said shaft and rotatable within the gap between the armature core (16) and the exciter core (14); a rectifier assembly (19, 21) including at least one diode rectifier (19) and a support plate (21) therefor; cooling means to cool the generator and the rectifier assembly, connected to the pressurized lubrication circuit wherein the generator housing defines at least one oil space (42) adjacent an end wall of the exciter core (14) to permit direct contact of the oil supplied by the pressurized lubrication circuit and the exciter core, and wherein at least one of said housings (12, 27) is formed with at least one annular groove extending around the respective housing, or housings, and in fluid communication with said pressurized lubrication circuit for the flow of oil thereabout; at least one oil supply passageway (3, 4, 21, 63) in fluid communication with said pressurized lubrication circuit connected to and furnishing pressurized oil from said circuit to said bearing; oil duct means (23, 41) connecting said oil space and said oil supply passageways to said lubricating circuit to establish said oil flow connection from said pressurized lubrication circuit; wherein the support plate (21) defines a subdivision within said generator housing (12), said oil space (42) being located to one side of said support plate, the other side of said support plate, within said housing, defining a dry chamber (47); and wherein the at least one rectifier (19) is located within said dry space, the oil from the pressurized lubricating circuit cooling the support plate at the side remote from the location of the at least one rectifier diode.

Claim 2

Dependent Claim 372 words

Oil cooled electric generator and rectifier combination for association with an engine having a pressurized lubrication circuit (37, 38, 39) comprising a generator housing (12); a stator housing (27) located within said generator housing; a stator including an armature core (16) and an armature winding (15) and further including an exciter core (14) and a field winding on the exciter core, the exciter core being spaced from the armature core leaving a gap, the stator being positioned within the stator housing (27); a bearing (22) mounted within the generator housing (12); a shaft (18, 55) rotatable in the bearing; a claw-pole rotor (17) mounted on said shaft and rotatable within the gap between the armature core (16) and the exciter core (14); a rectifier assembly (19, 21) including at least one diode rectifier (19) and a support plate (21) therefor; cooling means to cool the generator and the rectifier assembly, connected to the pressurized lubrication circuit wherein the generator housing defines at least one oil space (42) adjacent an end wall of the exciter core (14) to permit direct contact of the oil supplied by the pressurized lubrication circuit and the exciter core, and wherein at least one of said housings (12, 27) is formed with at least one annular groove extending around the respective housing, or housings, and in fluid communication with said pressurized lubrication circuit for the flow of oil thereabout; at least one oil supply passageway (3, 4, 21, 63) in fluid communication with said pressurized lubrication circuit connected to and furnishing pressurized oil from said circuit to said bearing; oil duct means (23, 41) connecting said oil space and said oil supply passageways to said lubricating circuit to establish said oil flow connection from said pressurized lubrication circuit; wherein the support plate (21) defines a subdivision within said generator housing (12), said oil space (42) being located to one side of said support plate, the other side of said support plate, within said housing, defining a dry chamber (47); and wherein the at least one rectifier (19) is located within said dry space, the oil from the pressurized lubricating circuit cooling the support plate at the side remote from the location of the at least one rectifier diode.

Claim 3

Dependent Claim 26 words

Generator according to claim 1, wherein a plurality of annular grooves are provided, said grooves being formed in the outer wall of the stator housing (27).

Claim 4

Dependent Claim 75 words

Generator according to claim 1, wherein the grooves extend around the respective wall of the housing in parallel planes perpendicular to the axis of rotation of said shaft; and axially extending connecting grooves (28, 32) are formed in the housing to interconnect said circumferentially extending grooves (26, 29, 31, 33), the axially extending connecting grooves being alternately located at diametrically opposed positions within the respective housing to provide for counter-flow of oil in adjacent grooves.

Claim 5

Dependent Claim 36 words

Generator according to claim 1, wherein separate oil duct means (23, 41) are provided for said oil space (42) and for the bearing, respectively, to provide oil to the bearing direct from said pressurized lubricating circuit.

Claim 6

Dependent Claim 16 words

Generator according to claim 1, wherein the support plate is formed with cooling fins (21', 21").

Claim 7

Dependent Claim 57 words

Generator according to claim 1, wherein said generator housing further comprises a bearing block located at one axial end of the housing, the bearing (22) being positioned within said bearing block; and wherein the oil duct means connecting the oil space and the oil supply passageways to the pressurized lubricating circuit is located adjacent said bearing block.

Claim 8

Dependent Claim 71 words

Generator according to claim 6, further including an attachment flange (58) to attach the generator to a support, the attachment flange being located adjacent to the bearing block, and formed with at least a portion of said oil duct means and oil supply passageways, the distribution of pressurized oil within said generator to, respectively, said oil space (42) and said bearing (22) being effected by intersecting passageways positioned within said flange.

Claim 9

Dependent Claim 66 words

Generator according to claim 1, further comprising a bearing block (54) retaining the bearing (22, 52, 53) therein; said bearing block being formed with a plurality of circumferentially positioned lobes (63); and wherein said oil duct means (64, 66) connecting the bearing to the pressurized lubricating circuit comprises bores formed in respective ones of said lobes to supply oil to, and drain oil from said bearing.

Claim 10

Dependent Claim 91 words

Generator according to claim 8, further comprising an attachment flange (58) to attach the generator to a support, the attachment flange and said bearing block being secured together; the attachment flange being formed with attachment means (61) to attach the generator to said support in a desired position, the respective plurality of lobes permitting placement of the oil duct means (64, 66) to extend in an essentially vertical direction and permit drainage of oil by gravity regardless of the orientation of the attachment means with respect to an essentially vertical direction.

Claim 11

Dependent Claim 24 words

Generator according to claim 1, wherein the bearing (22) comprises a composite bearing array including a roller bearing (53) and a ball bearing (52).

Claim 12

Dependent Claim 31 words

Generator according to claim 1, further comprising a shaft connection to connect the shaft (18) retaining the rotor to an external drive shaft, said shaft connection comprising a conical connection (56).

Claim 13

Dependent Claim 17 words

Generator according to claim 11, wherein said shaft connection is positioned between the bearing and the rotor.

Claim 14

Dependent Claim 19 words

Generator according to claim 1, wherein the rotor (17) is connected to the shaft (18) by a shrink fit.

Claim 15

Dependent Claim 54 words

Generator according to claim 1, wherein the bearing (22) comprises the combination of a ball bearing (52) and a roller bearing (53) axially spaced from each other, the spacing and load bearing and running characteristics of the ball bearing and the roller bearing, respectively, being matched to provide for essentially equal wear and lifetime.

Claim 16

Dependent Claim 40 words

Generator according to claim 1, further comprising a bearing block (54) within which the bearing (22) is positioned; and wherein said oil duct means includes at least one longitudinal groove (69) formed in the bearing block and adjacent the bearing.

Claim 17

Dependent Claim 22 words

Generator according to claim 15, further including at least one circumferential groove (67) formed in the bearing block and adjacent the bearing.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-04-13	1984-10-13	1985-04-14	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-04-13	1988-10-13	1989-04-14	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-04-13	1992-10-13	1993-04-14	$7700.00	Window Closed / Lapsed

Oil cooling for an electrical generator

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