# US 12,215,776 B2 · Power transmission device

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- Number: US 12,215,776 B2
- Document ID: US12215776B2
- Status: Granted
- Kind: B2
- Application number: 18/042,046
- Filed: 2021-09-08
- Published: 2023-09-28
- Granted: 2025-02-04
- Earliest claimed: 2020-10-07
- Assignees: JATCO Ltd
- Applicants: JATCO Ltd
- Inventors: Masumi Fujikawa
- Web page: https://patentgrep.com/patent/US12215776B2

## CPC

- F16H 57/0441: {Arrangements of pumps}
- F16H 57/021: Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
- F16H 57/0404: {Lubricant filters}
- F16H 57/0457: {Splash lubrication}
- F16H 57/0483: {Axle or inter-axle differentials}
- F16H 57/0495: {with fixed gear ratio}
- H02K 7/006: {Structural association of a motor or generator with the drive train of a motor vehicle}
- H02K 9/19: for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K 9/26: Structural association of machines with devices for cleaning or drying cooling medium, e.g. with filters
- B60K 2001/001: {one motor mounted on a propulsion axle for rotating right and left wheels of this axle}
- F16H 37/082: {and additional planetary reduction gears}
- F16H 48/08: comprising bevel gears
- F16H 57/0423: {Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes}
- F16H 57/0476: {Electric machines and gearing, i.e. joint lubrication or cooling or heating thereof}
- F16H 57/0479: {Gears or bearings on planet carriers}
- H02K 7/116: with gears
- F16H: GEARING
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- 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

## Abstract

A power transmission device, includes a motor; a gear mechanism connected downstream of the motor; a drive shaft connected downstream of the gear mechanism and disposed passing through an inner periphery of the motor; a pump that sucks oil through a pump inlet; and a plate that includes a facing surface facing the gear mechanism in an axial direction. The pump inlet is disposed adjacent to the plate on a back surface side of the facing surface.

## Claims

### Claim 1

A power transmission device, comprising:
a motor;
a gear mechanism connected downstream of the motor, the gear mechanism including a planetary reduction gear and a differential mechanism;
a drive shaft connected downstream of the gear mechanism and disposed passing through an inner periphery of the motor;
a pump configured to suck oil through a pump inlet;
a plate that includes a facing surface facing the planetary reduction gear and the differential mechanism in an axial direction and that supports the planetary reduction gear and the differential mechanism;
a supporting wall provided on a gear mechanism side of the motor, the supporting wall supporting the motor, wherein
the pump inlet is immersed in oil of an oil storage portion disposed in a first space formed between the plate and the supporting wall, the first space being separated from a second space wherein the planetary gear mechanism and the differential mechanism are disposed and the first space communicating with a third space wherein the motor is disposed through an opening in the supporting wall.

### Claim 2 (depends on 1)

The power transmission device according to claim 1, wherein
the plate is interposed between the motor and the gear mechanism in the axial direction.

### Claim 3 (depends on 1)

The power transmission device according to claim 1, wherein
the pump inlet serves as a suction port of a strainer.

### Claim 4 (depends on 3)

The power transmission device according to claim 3, wherein
a longitudinal direction of a main body portion of the strainer intersects with an axial direction of the motor.

### Claim 5 (depends on 3)

The power transmission device according to claim 3, wherein
the motor includes a rotor and a stator positioned on an outer side in a radial direction of the rotor, and
a main body portion of the strainer overlaps the motor on the outer side in the radial direction.

### Claim 6 (depends on 5)

The power transmission device according to claim 5, wherein
the main body portion of the strainer overlaps the rotor of the motor on the outer side in the radial direction.

### Claim 7 (depends on 5)

The power transmission device according to claim 5, wherein
the main body portion of the strainer does not overlap the gear mechanism in the radial direction.

### Claim 8 (depends on 1)

The power transmission device according to claim 1, further comprising:
a bearing supported by the plate, wherein
the gear mechanism is supported by the plate via the bearing.

### Claim 9 (depends on 1)

The power transmission device according to claim 1, further comprising:
a park pole supported by the plate.