# US 2023/0068720 A1 · Work vehicle

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- Number: US 2023/0068720 A1
- Document ID: US20230068720A1
- Status: Published application
- Kind: A1
- Application number: 17/897,651
- Filed: 2022-08-29
- Published: 2023-03-02
- Earliest claimed: 2021-08-31
- Assignees: Kanzaki Kokyukoki Mfg. Co., Ltd.
- Applicants: Kanzaki Kokyukoki Mfg. Co., Ltd.
- Inventors: Akihiro IMA; Koji KIYOOKA
- Web page: https://patentgrep.com/patent/US20230068720A1

## CPC

- B60K 17/14: the motor of fluid or electric gearing being disposed in, or adjacent to, traction wheel
- A01D 69/02: electric
- B60K 1/02: comprising more than one electric motor
- B60K 7/0007: {the motor being electric}
- B60K 17/043: {Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel}
- B62D 11/04: by means of separate power sources
- A01D 34/66: with two or more cutters
- A01D 2101/00: Lawn-mowers
- B60K 17/046: {with planetary gearing having orbital motion}
- B60K 2007/0061: {the motor axle being parallel to the wheel axle}
- B60Y 2200/223: Ridable lawn mowers
- F16H 63/345: {using friction brakes, e.g. a band brakes}
- 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
- A01D: HARVESTING; MOWING
- B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M)
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- F16H: GEARING

## Abstract

A work vehicle includes a main body frame and left and right axle drive devices that drive left and right rear wheels. The axle drive devices include left and right electric motors that are housed and fixed in a motor housing that is fixed to the main body frame and left and right gear mechanisms that are housed in gear housings that are fixed to left and right ends of the motor housing and are connected to the respective electric motors to transmit power. A motor shaft of each of the electric motors rotates the corresponding wheel via the corresponding axle-integrated rotating member including the axle. The motor shaft is also arranged to overlap, along the axial direction, with an inner portion of a circumscribing circle of a maximum outer diameter portion of the corresponding axle-integrated rotating member.

## Claims

### Claim 1

A work vehicle comprising:
a main body frame; and
left and right axle drive devices that drive left and right rear wheels via left and right axles, respectively,
wherein the two axle drive devices include left and right electric motors that are housed and fixed in a motor housing that is fixed to the main body frame, and left and right gear mechanisms that are housed in gear housings that are fixed to left and right ends of the motor housing, and are connected to the respective electric motors to transmit power,
the left and right axles are connected at output sides of the two gear mechanisms, and
each of motor shafts of the two electric motors rotates the corresponding wheel via an axle-integrated rotating member including the axle, the motor shaft being arranged to overlap, along an axle direction, with an inner portion of a circumscribing circle of a maximum outer diameter portion of the axle-integrated rotating member.

### Claim 2 (depends on 1)

The work vehicle according to claim 1, wherein
the motor shafts of the two electric motors are arranged to overlap with each other along an axial direction.

### Claim 3 (depends on 1)

The work vehicle according to claim 1, wherein
each of the motor shafts of the two electric motors is arranged to overlap, along the axle direction, with the inner portion of the circumscribing circle of the maximum outer diameter portion of the corresponding axle.

### Claim 4 (depends on 3)

The work vehicle according to claim 3, wherein
each of the motor shafts of the two electric motors is arranged coaxially with the corresponding axle.

### Claim 5 (depends on 1)

The work vehicle according to claim 1, wherein
the two gear housings are fixed to the main body frame by a fastening member inserted vertically with respect to the main body frame, and
the main body frame or the gear housing is formed with an elongated hole which is long in a left-right direction and into which the fastening member is inserted.