US 11,920,591 B2
Electric oil pump
Koji Higuchi, Zama (JP); Yutaka Hashimoto, Zama (JP); Yoshiyuki Maki, Tokyo (JP); and Kohei Kubo, Tokyo (JP)
Assigned to NIDEC TOSOK CORPORATION, Kanagawa (JP); and KYB CORPORATION, Tokyo (JP)
Appl. No. 17/290,305
Filed by NIDEC TOSOK CORPORATION, Zama (JP); and KYB CORPORATION, Tokyo (JP)
PCT Filed Sep. 20, 2019, PCT No. PCT/JP2019/036985
§ 371(c)(1), (2) Date Apr. 30, 2021,
PCT Pub. No. WO2020/095552, PCT Pub. Date May 14, 2020.
Claims priority of application No. 2018-211217 (JP), filed on Nov. 9, 2018.
Prior Publication US 2022/0034315 A1, Feb. 3, 2022
Int. Cl. F04C 2/10 (2006.01); F04C 11/00 (2006.01); F04C 13/00 (2006.01); F04C 15/06 (2006.01)
CPC F04C 2/102 (2013.01) [F04C 11/008 (2013.01); F04C 13/002 (2013.01); F04C 15/06 (2013.01); F04C 2210/206 (2013.01); F04C 2240/40 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An electric oil pump comprising:
a motor including a motor shaft extending along a central axis extending in an axial direction;
a pump assembly including a vane pump which is on one side of the motor in the axial direction and is driven by the motor via the motor shaft to suction and discharge oil; and
an inverter which is on another side of the motor in the axial direction to drive the motor; wherein
the motor includes:
a rotor which is rotatable together with the motor shaft;
a stator which is on a side outward from the rotor in a radial direction that intersects the axial direction; and
a motor housing which houses the rotor and the stator;
the pump assembly includes a pump body that is connected to one side of the motor housing in the axial direction;
the vane pump is housed within the pump body;
the motor housing includes:
a suction port through which the vane pump suctions oil from outside;
a discharge port through which the vane pump discharges oil to outside;
a suction oil passage leads from the suction port to the vane pump; and
a discharge oil passage leads from the vane pump to the discharge port;
the suction oil passage and the discharge oil passage include:
an axial oil passage extending from the pump assembly towards the motor in the axial direction; and
a radial oil passage extending in the radial direction and leading to the suction port or the discharge port;
the axial oil passage overlaps the stator when viewed along the radial direction;
the motor housing includes a flat surface portion in a portion of an outer peripheral shape thereof;
the flat surface includes a first surface which extends in parallel to the axial direction; and
the suction port and the discharge port are located on the first surface.