# US 10,479,207 B2 · Arrangement structure of wheel drive system

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- Number: US 10,479,207 B2
- Document ID: US10479207B2
- Status: Granted
- Kind: B2
- Application number: 15/741,867
- Filed: 2015-07-07
- Published: 2018-08-02
- Granted: 2019-11-19
- Earliest claimed: 2015-07-07
- Assignees: Nissan Motor Co., Ltd.
- Applicants: Nissan Motor Co., Ltd.
- Inventors: Hiroyuki Nakayama; Yukio Mizukoshi
- Web page: https://patentgrep.com/patent/US10479207B2

## CPC

- B60L 7/16: for vehicles comprising converters between the power source and the motor
- B60K 1/00: Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00)
- B60K 1/02: comprising more than one electric motor
- B60K 7/00: Disposition of motor in, or adjacent to, traction wheel
- B60K 7/0007: {the motor being electric}
- B60K 2007/0038: {the motor moving together with the wheel axle}
- B60K 2007/0061: {the motor axle being parallel to the wheel axle}
- B60L 2210/44: Current source inverters
- B60L 2220/44: Wheel Hub motors, i.e. integrated in the wheel hub
- B60L 2240/423: Torque
- B60Y 2400/61: Arrangements of controllers for electric machines, e.g. inverters
- B60Y 2400/81: Braking systems
- F16D 2127/04: for manual operation
- 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
- 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
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

An arrangement structure of a wheel drive system comprising a tire wheel and a drive unit for driving the tire wheel, wherein the tire wheel includes a brake part arranged to a hollow space of the tire wheel, the drive unit includes a motor and an inverter for driving the motor, the inverter includes a power module for supplying power to the motor and a bus bar for supplying power supplied from outside the tire wheel to the power module, and the bus bar is arranged to the brake part side than the power module.

## Claims

### Claim 1

An arrangement structure of a wheel drive system comprising:
a tire wheel; and
a drive unit for driving the tire wheel,
wherein the tire wheel includes a brake part arranged in a hollow space of the tire wheel,
the drive unit includes a motor and an inverter for driving the motor,
the inverter includes a power module for supplying power to the motor, and a bus bar which transmits power supplied from an outside of the tire wheel to the power module, and
the bus bar is arranged between the brake part and the power module.

### Claim 2 (depends on 1)

The arrangement structure of the wheel drive system according to claim 1, wherein the bus bar is plate-shaped.

### Claim 3 (depends on 1)

The arrangement structure of the wheel drive system according to claim 1 comprising:
a reduction gear for transmitting power of the motor to the tire wheel,
wherein the inverter is arranged adjacent to the reduction gear,
at least a part of the bus bar is arranged near the reduction gear, and
the bus bar is arranged between the power module and the reduction gear.

### Claim 4 (depends on 1)

The arrangement structure of the wheel drive system according to claim 1, comprising:
a reduction gear for transmitting power of the motor to the tire wheel; and
a partition arranged between the reduction gear and the inverter,
wherein the inverter is arranged near the reduction gear via the partition,
at least a part of the bus bar is in contact with the partition, and
the bus bar and the partition are arranged between the power module and the reduction gear.

### Claim 5 (depends on 1)

The arrangement structure of the wheel drive system according to claim 1, comprising:
a reduction gear for transmitting power of the motor to the tire wheel;
a partition arranged between the reduction gear and the inverter; and
an insulator arranged between the partition and the inverter and formed with a high heat-conductivity member,
wherein the bus bar, the insulator and the partition are arranged between the power module and the reduction gear.

### Claim 6 (depends on 1)

The arrangement structure of the wheel drive system according to claim 1, comprising:
a reduction gear for transmitting power of the motor to the tire wheel;
a partition arranged between the reduction gear and the inverter; and
a conductor arranged between the partition and the inverter and formed with a high heat-conductivity member,
wherein
at least one part of the bus bar is covered with an insulating member, and
the bus bar, the conductor and the partition are arranged between the power module and the reduction gear.

### Claim 7 (depends on 1)

The arrangement structure of the wheel drive system according to claim 1, comprising:
a reduction gear for transmitting power of the motor to the tire wheel,
wherein the reduction gear includes a lubricating oil, and
the bus bar is arranged between the power module and the reduction gear.

### Claim 8 (depends on 1)

The arrangement structure of the wheel drive system according to claim 1, comprising:
a reduction gear for transmitting power of the motor to the tire wheel,
wherein the inverter is arranged adjacent to the reduction gear, and
the bus bar is arranged between the power module and the reduction gear.

### Claim 9 (depends on 1)

The arrangement structure of the wheel drive system according to claim 1,
wherein a space is formed between the power module and the bus bar to dissipate heat of the power module.

### Claim 10 (depends on 1)

The arrangement structure of the wheel drive system according to claim 1,
wherein the inverter includes a case for housing the power module and the bus bar,
the case includes a fastening part fastened by a fastening member and an unfastened part not fastened by the fastening member, and
the power module is arranged in a space surrounded by the unfastened part.

### Claim 11 (depends on 1)

The arrangement structure of the wheel drive system according to claim 1, comprising:
a reduction gear for transmitting power of the motor to the tire wheel,
wherein the inverter includes a smoothing capacitor electrically connected to the bus bar and is arranged near the reduction gear,
at least one part of the bus bar is an inverter component closest to the reduction gear, and
the smoothing capacitor is arranged above the at least one part of the bus bar.

### Claim 12 (depends on 1)

The arrangement structure of the wheel drive system according to claim 1,
wherein the inverter includes a drive circuit for driving the power module, and a case for housing the power module, the bus bar, and the drive circuit, and
the drive circuit is attached to a surface of the case.

### Claim 13 (depends on 1)

The arrangement structure of the wheel drive system according to claim 1, wherein the inverter is arranged outward in a vehicle-width direction relative to a position of the motor.