# US 12,181,032 B2 · Transmission device

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- Number: US 12,181,032 B2
- Document ID: US12181032B2
- Status: Granted
- Kind: B2
- Application number: 18/283,541
- Filed: 2021-03-26
- Published: 2024-05-16
- Granted: 2024-12-31
- Earliest claimed: 2021-03-26
- Assignees: Musashi Seimitsu Industry Co., Ltd.
- Applicants: Musashi Seimitsu Industry Co., Ltd.
- Inventors: Ryosuke Asai; Shinya Matsuoka; Kazuma Oyaizu
- Web page: https://patentgrep.com/patent/US12181032B2

## CPC

- F16H 37/082: {and additional planetary reduction gears}
- F16H 48/08: comprising bevel gears
- F16H 48/40: characterised by features of the rotating cases
- F16H 57/037: Gearboxes for accommodating differential gearings (rotating cases for differential gearings F16H48/40)
- F16H 57/0483: {Axle or inter-axle differentials}
- 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 2001/001: {one motor mounted on a propulsion axle for rotating right and left wheels of this axle}
- B60Y 2200/91: Electric vehicles
- B60Y 2400/73: Planetary gearings
- B60Y 2410/10: Housings
- F16H 48/38: Constructional details (the outer casing comprising the differential and supporting input and output shafts F16H57/037)
- F16H 57/0402: {Cleaning of lubricants, e.g. filters or magnets}
- F16H 57/0423: {Lubricant guiding means mounted or supported on the casing, e.g. shields or baffles for collecting lubricant, tubes or pipes}
- F16H 57/0457: {Splash lubrication}
- F16H: GEARING
- 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

## Abstract

Provided is a transmission device including a differential case. The differential case is configured to be divided into first and second cases defining therebetween a mechanism chamber housing a differential mechanism therein and capable of storing an oil at a bottom part of the mechanism chamber. Two or more planetary gears are pivotally supported by a carrier of a gear reducer in the vicinity of large-diameter gear parts and pivotally supported by the differential case in the vicinity of small-diameter gear parts. The second case is held between the first case and the carrier coupled to the first case, whereby the second case is fixed to the first case.

## Claims

### Claim 1

A transmission device comprising a transmission unit,
the transmission unit comprising a gear reducer and a differential device whose differential case receives an output of the gear reducer, and being housed in a transmission case,
the gear reducer comprising:
a sun gear;
a ring gear arranged concentrically to the sun gear and fixed to the transmission case; and
two or more planetary gears integrally including large-diameter gear parts meshing with the sun gear and small-diameter gear parts meshing with the ring gear,
the differential case being configured to be divided into first and second cases defining therebetween a mechanism chamber housing a differential mechanism therein and capable of storing an oil at a bottom part of the mechanism chamber,
the two or more planetary gears being pivotally supported by a carrier of the gear reducer in the vicinity of the large-diameter gear parts and pivotally supported by the differential case in the vicinity of the small-diameter gear parts,
the second case being held between the first case and the carrier coupled to the first case, whereby the second case is fixed to the first case,
wherein the differential mechanism comprises:
paired side gears rotatably supported by the differential case;
two or more pinion gears meshing with the paired side gears; and
a pinion shaft rotatably supporting the pinion gears on the differential case,
wherein the first case is provided with a pinion shaft supporting part supporting the pinion shaft, and
wherein the planetary gears are pivotally supported by the first case in the vicinity of the small-diameter gear parts thereof.

### Claim 2 (depends on 1)

The transmission device according to claim 1,
wherein at least one of mutually-facing surfaces of the carrier and the first case includes a recess part depressed in an axial direction, and
wherein the second case is held between the carrier and the first case while being fitted to the recess part.