# US 12,181,037 B2 · Rotary driving device

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- Number: US 12,181,037 B2
- Document ID: US12181037B2
- Status: Granted
- Kind: B2
- Application number: 17/646,728
- Filed: 2022-01-03
- Published: 2022-07-14
- Granted: 2024-12-31
- Earliest claimed: 2021-01-13
- Assignees: Toyota Jidosha Kabushiki Kaisha; Aisin Corporation
- Applicants: Toyota Jidosha Kabushiki Kaisha; Aisin Corporation
- Inventors: Yuki Katayama; Kazuyuki Sakaguchi; Hiroshi Ieiri
- Web page: https://patentgrep.com/patent/US12181037B2

## CPC

- F16H 57/043: {within rotary parts, e.g. axial channels or radial openings in shafts}
- B60K 6/445: Differential gearing distribution type
- F16H 57/0018: {Shaft assemblies for gearings (camshafts with single track cams F16H53/02)}
- F16H 57/021: Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
- F16H 57/0424: {Lubricant guiding means in the wall of or integrated with the casing, e.g. grooves, channels, holes}
- F16H 57/0441: {Arrangements of pumps}
- F16H 57/045: {Lubricant storage reservoirs, e.g. reservoirs in addition to a gear sump for collecting lubricant in the upper part of a gear case}
- B60Y 2200/91: Electric vehicles
- 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

The rotary driving device includes a shaft which has one end and the other end in the axial direction and is provided with an oil passage through which lubricating oil flows from one end to the other end, a transmission case accommodating the shaft therein, and a bearing arranged at the other end of the shaft in the transmission case and rotatably supporting the shaft. The shaft includes an end surface located on the other end in the axial direction. The transmission case includes an opposing surface facing the end surface with a gap therebetween in the axial direction. One of the end surface and the opposing surface is provided with a groove so as to generate a negative pressure on the other end when the shaft rotates.

## Claims

### Claim 1

A rotary driving device comprising:
a shaft which has one end and the other end in an axial direction and is provided with an oil passage through which lubricating oil flows from the one end to the other end;
a transmission case accommodating the shaft therein; and
a bearing arranged at the other end of the shaft and rotatably supporting the shaft,
the shaft including an end surface located on the other end in the axial direction,
the transmission case including an opposing surface facing the end surface with a gap therebetween in the axial direction, and
one of the end surface and the opposing surface being provided with a groove so as to generate a negative pressure on the other end when the shaft rotates to suck the lubricating oil through the oil passage towards the other end.

### Claim 2 (depends on 1)

The rotary driving device according to claim 1, wherein
the transmission case includes an opposing wall facing the other end of the shaft in the axial direction,
an inner surface of the opposed wall is provided with an annular member which is coaxial with a central axis of the shaft, and
the opposing surface is formed by a surface of the annular member facing the end surface of the shaft in the axial direction.

### Claim 3 (depends on 1)

The rotary driving device according to claim 1, wherein
the groove is provided as a plurality of grooves, and
the plurality of grooves are provided around a central axis of the shaft in a radial pattern.

### Claim 4 (depends on 1)

The rotary driving device according to claim 1, wherein the groove is curved toward an outer peripheral edge of the opposing surface.

### Claim 5 (depends on 1)

The rotary driving device according to claim 1, wherein
the opposing surface is an annular member which is coaxial with a central axis of the shaft, and
the gap formed between the end surface of the shaft and the annular member in the axial direction along the central axis.