# US 12,594,825 B2 · In-wheel motor driving device

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- Number: US 12,594,825 B2
- Document ID: US12594825B2
- Status: Granted
- Kind: B2
- Application number: 18/382,752
- Filed: 2023-10-23
- Published: 2024-07-04
- Granted: 2026-04-07
- Earliest claimed: 2022-12-28
- 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/US12594825B2

## CPC

- B60K 7/00: Disposition of motor in, or adjacent to, traction wheel
- B60K 7/0007: {the motor being electric}
- B60K 17/046: {with planetary gearing having orbital motion}
- B60B 27/0073: {characterised by sealing means}
- B60K 17/043: {Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel}
- B60K 2007/0038: {the motor moving together with the wheel axle}
- B60K 2007/0061: {the motor axle being parallel to the wheel axle}
- B60K 2007/0092: {the motor axle being coaxial to 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
- B60B: VEHICLE WHEELS (making wheels or wheel parts by rolling B21H1/00, by forging, hammering or pressing B21K1/28); CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An in-wheel motor drive device includes: a motor case housing a motor provided in a wheel of a drive wheel; a reduction gear case housing a reduction gear; and a plurality of fastening bolts for fastening the motor case and the reduction gear case. Further, among the plurality of fastening bolts, a pair of fastening bolts facing each other across a stator coil end portion of the motor is arranged on a same straight line in a radial direction orthogonal to an axis direction of the motor.

## Claims

### Claim 1

An in-wheel motor drive device comprising:
a motor case housing a motor provided in a drive wheel;
a reduction gear case housing a reduction gear for decelerating a rotation of the motor and outputting the decelerated rotation from an output shaft to the drive wheel; and
a plurality of fastening bolts for fastening the motor case and the reduction gear case in a state where a mating surface of the motor case and a mating surface of the reduction gear case are combined,
wherein among the plurality of fastening bolts, a pair of fastening bolts facing each other across a stator coil end portion of the motor is arranged on a same straight line in a radial direction orthogonal to an axis direction of the motor, and
wherein a sealing material is provided between the mating surface of the motor case and the mating surface of the reduction gear case and on an inner side of one of the pair of fastening bolts in the radial direction, the one of the pair of fastening bolts being provided on an inner side of the stator coil end portion in the radial direction.