# US 11,994,201 B2 · Power transmission device for work vehicle

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- Number: US 11,994,201 B2
- Document ID: US11994201B2
- Status: Granted
- Kind: B2
- Application number: 17/525,262
- Filed: 2021-11-12
- Published: 2022-06-30
- Granted: 2024-05-28
- Earliest claimed: 2020-12-28
- Assignees: Kubota Corporation
- Applicants: Kubota Corporation
- Inventors: Tomonari Tsuchida; Atsuro Hayami; Hiroyuki Sadamoto; Keitaro Morinaga; Kazuhiro Wada; Rikuto Araki; Ryoma Iwase; Tomoyuki Tanaka; Takahiro Matsuo; Hiroyuki Aikawa
- Web page: https://patentgrep.com/patent/US11994201B2

## CPC

- F16H 57/021: Shaft support structures, e.g. partition walls, bearing eyes, casing walls or covers with bearings
- F16H 57/0409: {characterised by increasing efficiency, e.g. by reducing splash losses}
- 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 57/0494: {with variable gear ratio or for reversing rotary motion}
- F16H: GEARING

## Abstract

A power transmission device for a work vehicle includes a transmission case, a gear transmission housed in the transmission case and configured to transmit power to a travel device, and a transmission gear provided in the gear transmission in a state of sitting in lubricating oil stored in an internal space of the transmission case, the transmission case being provided with a wall part supporting a support shaft of the transmission gear in a state of being adjacent to the transmission gear, and the wall part being provided with a cover part protruding toward the outer periphery of the transmission gear from the wall part and covering the transmission gear.

## Claims

### Claim 1

A power transmission device for a work vehicle, comprising:
a transmission case;
a gear transmission housed in the transmission case and configured to transmit power to a travel device; and
a transmission gear provided in the gear transmission in a state of sitting in lubricating oil stored in an internal space of the transmission case,
wherein the transmission case is provided with a wall supporting a support shaft of the transmission gear while being adjacent to the transmission gear,
the wall is provided with a cover protruding from the wall toward an outer periphery of the transmission gear and covering the transmission gear such that the cover inhibits the spreading of lubricating oil, when agitated, to the lubricating oil stored in other regions of the internal space of the transmission case,
the cover is provided below the transmission gear in a state of sitting in the lubricating oil stored in the internal space of the transmission case, and
the wall is a separate member from the transmission case, such that the wall is removably coupled to the inside of the transmission case.

### Claim 2 (depends on 1)

The power transmission device according to claim 1, wherein the cover is arc-shaped as viewed in a direction of an axis of the support shaft.

### Claim 3 (depends on 1)

The power transmission device according to claim 1, wherein the cover is integrally molded with the wall.

### Claim 4 (depends on 1)

The power transmission device according to claim 1, wherein the wall is provided with a shaft support configured to support the support shaft of the transmission gear in a state where the support shaft is disposed through the shaft support.

### Claim 5

A power transmission device for a work vehicle, comprising:
a transmission case;
a gear transmission housed in the transmission case and configured to transmit power to a travel device; and
a plurality of transmission gears provided in the gear transmission in a state of sitting in lubricating oil stored in an internal space of the transmission case,
wherein the transmission case is provided with a wall supporting a support shaft of each of the plurality of transmission gears while being adjacent to the plurality of transmission gears, and
the wall is provided with a continuous recess in which the plurality of transmission gears sit, and
the transmission case is provided with a cover protruding from the wall toward an outside of the recess and circumferentially covering a region of the plurality of transmission gears, the region being located outside of the recess.

### Claim 6 (depends on 5)

The power transmission device according to claim 5, wherein the cover protrudes from a region of the wall, the region extending along a periphery of the recess.

### Claim 7

A power transmission device for a work vehicle, comprising:
a transmission case;
a gear transmission housed in the transmission case and configured to transmit power to a travel device; and
a transmission gear provided in the gear transmission in a state of sitting in lubricating oil stored in an internal space of the transmission case,
wherein the transmission case is provided with a wall supporting a support shaft of the transmission gear while being adjacent to the transmission gear,
the wall is provided with a cover protruding from the wall toward an outer periphery of the transmission gear and covering the transmission gear such that the cover inhibits the spreading of lubricating oil, when agitated, to the lubricating oil stored in other regions of the internal space of the transmission case, and
a position of an oil surface of the lubricating oil and a position of the support shaft are the same.