# US 2016/0355083 A1 · In-wheel motor drive device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2016/0355083 A1
- Document ID: US20160355083A1
- Status: Published application
- Kind: A1
- Application number: 15/102,334
- Filed: 2014-11-18
- Published: 2016-12-08
- Earliest claimed: 2013-12-17
- Assignees: Ntn Corporation
- Applicants: Ntn Corporation
- Inventors: Masaru KURODA; Tomohisa UOZUMI; Kenichi SUZUKI
- Web page: https://patentgrep.com/patent/US20160355083A1

## CPC

- B60K 7/0007: {the motor being electric}
- B60K 7/00: Disposition of motor in, or adjacent to, traction wheel
- B60K 17/046: {with planetary gearing having orbital motion}
- F16C 19/06: with a single row or balls
- F16C 19/186: {with three raceways provided integrally on parts other than race rings, e.g. third generation hubs}
- F16C 35/063: Fixing them on the shaft (with interposition of an element F16C35/07)
- F16H 1/32: in which the central axis of the gearing lies inside the periphery of an orbital gear
- H02K 1/22: Rotating parts of the magnetic circuit
- H02K 1/28: Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K 7/003: {Couplings; Details of shafts (means for mounting rotors on shafts H02K1/28)}
- H02K 7/08: Structural association with bearings
- H02K 7/116: with gears
- H02K 15/00: Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K 15/14: Casings; Enclosures; Supports
- B60K 11/02: with liquid cooling
- B60K 2001/006: {the electric motors}
- B60K 2007/0038: {the motor moving together with the wheel axle}
- B60K 2007/0092: {the motor axle being coaxial to the wheel axle}
- B60L 2220/44: Wheel Hub motors, i.e. integrated in the wheel hub
- B60Y 2306/03: Lubrication
- F16C 2326/02: Wheel hubs or castors
- 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
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16H: GEARING
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

An in-wheel motor drive device includes: a motor part; a speed reduction part; a wheel bearing part; and a casing, the motor part including: a stator, which is fixed to the casing; a rotation shaft of a motor, which is rotatably supported on the casing through intermediation of a plurality of rolling bearings; and a rotor, which is mounted to the rotation shaft of the motor, the rotation shaft of the motor being configured to rotationally drive an input shaft of a speed reducer, the speed reduction part being configured to reduce a speed of rotation of the input shaft of the speed reducer to transmit the rotation to an output shaft of the speed reducer, the wheel bearing part being connected to the output shaft of the speed reducer, the rotation shaft of the motor being made of case hardening steel and subjected to carburizing, quenching, and tempering.

## Claims

### Claim 1

An in-wheel motor drive device, comprising:
a motor part;
a speed reduction part;
a wheel bearing part; and
a casing,
the motor part comprising:
a stator, which is fixed to the casing;
a rotation shaft of a motor, which is rotatably supported on the casing through intermediation of a plurality of rolling bearings; and
a rotor, which is mounted to the rotation shaft of the motor,
the rotation shaft of the motor in the motor part being configured to rotationally drive an input shaft of a speed reducer in the speed reduction part,
the speed reduction part being configured to reduce a speed of rotation of the input shaft of the speed reducer to transmit the rotation to an output shaft of the speed reducer,
the wheel bearing part being connected to the output shaft of the speed reducer,
the rotation shaft of the motor being made of case hardening steel and subjected to carburizing, quenching, and tempering as heat treatment.

### Claim 2 (depends on 1)

The in-wheel motor drive device according to claim 1,
wherein the rotation shaft of the motor comprises a flange portion configured to hold one end of the rotor in an axial direction of the rotor,
wherein the rotation shaft of the motor further comprises a clamping member to be brought into contact with another end of the rotor,
wherein the rotor is clamped by the flange portion and the clamping member to be mounted to the rotation shaft of the motor, and
wherein the flange portion comprises a low-hardness portion for adjustment of unbalance.

### Claim 3 (depends on 2)

The in-wheel motor drive device according to claim 2, wherein the low-hardness portion is subjected to anti-carburizing treatment.

### Claim 4 (depends on 2)

The in-wheel motor drive device according to claim 2, wherein the rotation shaft of the motor having the rotor mounted thereto has a permissible residual specific unbalance of from 0.5 to 5 after the adjustment of unbalance.

### Claim 5 (depends on 2)

The in-wheel motor drive device according to claim 2, wherein the clamping member is made of a material different from a material for the rotation shaft of the motor.

### Claim 6 (depends on 5)

The in-wheel motor drive device according to claim 5, wherein the clamping member is made of austenitic stainless steel.