IP Library › Granted Patent US 12674453
Granted Patent B2
US 12674453 · App. 18/730,026 · Granted Jul 7, 2026

Pump assembly

Inventor: Shoichi Takada (Takahashi, JP)
Assignee: Sumitomo Electric Sintered Alloy, Ltd.
F04C11/008F04C2/102F04C2/344F04C15/008H02K9/193F04C2240/40
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Quick Facts
Patent No.
US 12674453
App. No.
18/730,026
Granted
Jul 7, 2026
Kind
B2
Abstract

A pump assembly includes an axial gap motor including a stator, a motor rotor, and a motor shaft, and a pump including a pump rotor configured to be rotated by the motor rotor and a pump housing configured to house the pump rotor. The stator includes a yoke having an annular shape, and a plurality of teeth disposed on a first surface of the yoke. The pump is disposed in an internal space surrounded by the plurality of teeth. The pump housing has a passage space formed in an interior of the pump housing, and a leak passage opened from the passage space toward the motor rotor.

Claims (29)

1 . A pump assembly comprising:

an axial gap motor including a stator, a motor rotor, and a motor shaft; and

a pump including a pump rotor configured to be rotated by the motor rotor and a pump housing configured to house the pump rotor,

wherein the stator includes

a yoke having an annular shape, and

a plurality of teeth disposed on a first surface of the yoke,

wherein the pump is disposed in an internal space surrounded by the plurality of teeth, and

wherein the pump housing has

a passage space formed in an interior of the pump housing, and

a leak passage opened from the passage space toward the motor rotor.

2 . The pump assembly according to claim 1 ,

wherein the pump housing has a through hole communicating with the interior and an outside of the pump housing,

wherein a portion of the motor shaft is disposed in the interior of the pump housing by extending through the through hole, and

wherein the leak passage is formed of a gap between the through hole and the motor shaft.

3 . The pump assembly according to claim 1 ,

wherein the pump has an inlet port and an outlet port,

wherein the inlet port and the outlet port are arranged in a first direction as viewed from the pump rotor, and

wherein the first direction is a direction along an axis of the motor shaft and is a direction away from the motor rotor.

4 . The pump assembly according to claim 1 ,

wherein the axial gap motor includes a motor housing, and

wherein the motor housing has a drain passage communicating with an interior and an outside of the motor housing.

5 . The pump assembly according to claim 1 ,

wherein the pump is an internal gear pump including an external gear and an internal gear, and

wherein the external gear is the pump rotor.

6 . The pump assembly according to claim 1 ,

wherein the pump is a vane pump, and

wherein the pump rotor includes a plurality of vanes.

7 . The pump assembly according to claim 3 ,

wherein the pump housing has a return passage configured to allow communication between the internal space and the inlet port.