# US 11,994,170 B2 · Differential gear

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- Number: US 11,994,170 B2
- Document ID: US11994170B2
- Status: Granted
- Kind: B2
- Application number: 17/672,191
- Filed: 2022-02-15
- Published: 2022-06-02
- Granted: 2024-05-28
- Earliest claimed: 2017-09-08
- Assignees: Kanzaki Kokyukoki Mfg. Co., Ltd.
- Applicants: Kanzaki Kokyukoki Mfg. Co., Ltd.
- Inventors: Toshiyuki Fukuda
- Web page: https://patentgrep.com/patent/US11994170B2

## CPC

- F16D 1/08: with clamping hub; with hub and longitudinal key
- F16H 48/12: without gears having orbital motion
- F16H 48/38: Constructional details (the outer casing comprising the differential and supporting input and output shafts F16H57/037)
- B60K 17/165: {provided between independent half axles (B60K17/18, B60K17/20 take precedence)}
- F16H 48/08: comprising bevel gears
- F16H 2048/382: {Methods for manufacturing differential gearings}
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- 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

## Abstract

A differential gear includes a holder which is provided between first and second pinion gears in a differential case and through which a differential pinion shaft is inserted. An insertion hole is radially formed in the differential pinion shaft. The holder is formed with a fixing hole facing the insertion hole when the differential pinion shaft is inserted through the holder. Due to insertion of a fixing pin through the fixing hole and the insertion hole, the differential pinion shaft and the holder are relatively non-rotatable. Due to the holder being held between first and second side gears, relative rotation of the holder with respect to the differential case is restricted, and the differential pinion shaft is non-rotatable relative to the differential case.

## Claims

### Claim 1

A differential gear comprising:
a gear;
a differential case to which the gear is fixed on an outer peripheral surface so as to be integrally rotatable;
a differential pinion shaft that is inserted through a shaft support hole formed in the differential case and that is housed in the differential case such that an axial direction is along a direction perpendicular to a rotation axis of the differential case;
first and second pinion gears rotatably supported about an axis of the differential pinion shaft around both ends of the differential pinion shaft inside the differential case; and
first and second side gears that are disposed inside the differential case at a predetermined space, mesh with the first and second pinion gears, and are housed in the differential case so as to be rotatable with reference to an identical rotation axis to the differential case, wherein
a bulging portion having a flat surface perpendicular to the rotation axis of the differential case is provided at a central part of the differential pinion shaft, and the flat surface is brought into direct or indirect contact with an inner surface of at least one of the first and second side gears,
wherein an end surface and an opposite end surface of a fixing pin inserted in the fixing hole respectively face the first and second side gears,
the bulging portion is a holder through which the differential pinion shaft is inserted, and which has the flat surface on an end surface, and
stepped portions in which an outer peripheral end is reduced in a thickness direction are formed on both left and right side surfaces of the holder.