# US 2024/0253448 A1 · In-wheel motor

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- Number: US 2024/0253448 A1
- Document ID: US20240253448A1
- Status: Published application
- Kind: A1
- Application number: 18/496,181
- Filed: 2023-10-27
- Published: 2024-08-01
- Earliest claimed: 2023-01-30
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Keita IMAI; Kiichi YOKOYAMA; Hiroki MONJI; Yusuke UETA; Tatsuya SAKAI
- Web page: https://patentgrep.com/patent/US20240253448A1

## CPC

- B60K 7/0007: {the motor being electric}
- H02K 7/116: with gears
- H02K 9/19: for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- B60K 2007/0038: {the motor moving together with the wheel axle}
- Y02T 10/64: Electric machine technologies in electromobility
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An in-wheel motor having a case including a motor case, a motor cover, and a reduction gear case, wherein the oil pump includes a pump chamber formed in the motor cover, a pump cover attached to the motor cover and closing the pump chamber, It has a pump shaft that penetrates the pump cover, a drive gear that is attached to the pump shaft and arranged inside the pump chamber, and a driven gear that meshes with the drive gear and is arranged inside the pump chamber, the pump shaft is attached to the input shaft of the reduction gear, the pump cover is bolted to the motor cover from the inside of the case, and the pump cover is integrally formed with a positioning structure for determining the position of the pump shaft.

## Claims

### Claim 1

An in-wheel motor comprising:
a motor mounted inside a wheel;
a reduction gear including an input shaft attached to a rotor shaft of the motor and configured to transmit power of the motor to the wheel;
a case housing the motor and the reduction gear; and
an oil pump disposed in the case, the case including a motor case housing the motor, a motor cover attached to the motor case, and a reduction gear case attached to an opposite side of the motor case from the motor cover and housing the reduction gear, wherein:
the oil pump includes
a pump chamber in the motor cover,
a pump cover attached to the motor cover and closing the pump chamber,
a pump shaft extending through the pump cover,
a drive gear attached to the pump shaft and disposed in the pump chamber, and
a driven gear meshing with the drive gear and disposed in the pump chamber;
the pump shaft is attached to an input shaft of the reduction gear;
the pump cover is bolted to the motor cover from inside the case; and
a positioning structure that positions the pump shaft is molded integrally with the pump cover.

### Claim 2 (depends on 1)

The in-wheel motor according to claim 1, wherein the positioning structure includes a boss portion through which the pump shaft is inserted, and the positioning structure supports the pump shaft via a bearing attached to an inner peripheral surface of the boss portion.

### Claim 3 (depends on 1)

The in-wheel motor according to claim 1, wherein the motor cover includes a housing portion having a tubular shape, protruding toward inside of the case in an axial direction, and housing the pump cover, the in-wheel motor further comprising:
a bearing attached to inside of the housing portion and configured to rotatably support the rotor shaft; and
a resolver attached to outside of the housing portion and configured to detect the number of rotations of the rotor shaft.