US 12,421,964 B2Granted

Electric oil pump

AssigneeHangzhou Quadrant Technology Co., Ltd.

InventorsLiping Wang, Guojun Zhang, Ruinan Wang, Hezhao Hua, Yi Zhao, Zhixue Lu

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Abstract

An electric oil pump, including a pump housing, a fixed shaft in the pump housing, an inner gear eccentrically and rotatably connected to the fixed shaft, an outer gear coaxially connected to the fixed shaft and rotatably arranged in the pump housing, the outer gear is located at an outer periphery of the inner gear and engaged with the inner gear, a motor rotor fixedly connected to an outer periphery of the outer gear, and a motor stator at an outer periphery of the motor rotor, the motor stator is fixedly connected to the pump housing. A projection area of the motor stator, a projection area of the motor rotor, a projection area of the outer gear, a projection area of the inner gear and a projection area of the fixed shaft on a plane through an axis of the fixed shaft at least partially overlap.

Claims11

Dependent claims

An electric oil pump, comprising:

a pump housing,
a fixed shaft in the pump housing,
an inner gear, the inner gear is eccentrically and rotationally connected to the fixed shaft,
an outer gear, the outer gear is coaxially connected to the fixed shaft and rotatably arranged in the pump housing, the outer gear is located at an outer periphery of the inner gear and meshed with the inner gear,
a motor rotor, the motor rotor is fixedly connected to an outer periphery of the outer gear,
a motor stator at an outer periphery of the motor rotor, the motor stator is fixedly connected to the pump housing,
a bearing, wherein an outer circle of the motor rotor is integrally formed with a neck to match with the bearing, the outer gear is rotationally connected to a first end of the fixed shaft by virtue of the bearing, and a second end of the fixed shaft is connected to the pump housing,
wherein an oil outlet is formed in a side wall of the pump housing, and an oil inlet is defined at a bottom of the pump housing.

5 more elements

An electric oil pump, comprising:

a pump housing,
a fixed shaft in the pump housing,
an inner gear, the inner gear is eccentrically and rotationally connected to the fixed shaft,
an outer gear, the outer gear is coaxially connected to the fixed shaft and rotatably arranged in the pump housing, the outer gear is located at an outer periphery of the inner gear and meshed with the inner gear,
a motor rotor, the motor rotor is fixedly connected to an outer periphery of the outer gear,
a motor stator at an outer periphery of the motor rotor, the motor stator is fixedly connected to the pump housing,
an upper cover fixedly connected to the outer gear, and
a bearing, wherein a second end of the fixed shaft is rotationally connected to the pump housing by virtue of the bearing, a first end of the fixed shaft is coaxially connected to the outer gear through the upper cover,
wherein an oil outlet is formed in a side wall of the pump housing, and an oil inlet is defined at a bottom of the pump housing.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/801,900Filed 13 Aug 2024
Priority: CN 202311034365.117 Aug 2023
Published: US 2025/0059972 A120 Feb 2025
Granted: 23 Sep 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification19 codes

F04C 2/102
Of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member: the two members rotating…
H02K 7/116
Structural association with clutches, brakes, gears, pulleys or mechanical starters: with gears
F01P 5/12
Pumping liquid coolant; Arrangements of coolant pumps: pump-driving arrangements
F04C 2/086
Details specially related to intermeshing engagement type machines or pumps: carter