# US 10,480,640 B2 · Power transmission device

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- Number: US 10,480,640 B2
- Document ID: US10480640B2
- Status: Granted
- Kind: B2
- Application number: 15/543,089
- Filed: 2016-03-02
- Published: 2018-01-11
- Granted: 2019-11-19
- Earliest claimed: 2015-03-04
- Assignees: Honda Lock Mfg. Co., Ltd.
- Applicants: Honda Lock Mfg. Co., Ltd.
- Inventors: Hiroyuki Kouzuma; Kohei Hirotani
- Web page: https://patentgrep.com/patent/US10480640B2

## CPC

- F16H 57/12: Arrangements for adjusting or for taking-up backlash not provided for elsewhere
- B60K 26/02: of initiating means or elements
- B60K 26/021: {with means for providing feel, e.g. by changing pedal force characteristics}
- F16H 1/16: comprising worm and worm-wheel
- G05G 1/30: Controlling members actuated by foot
- G05G 1/46: Means, e.g. links, for connecting the pedal to the controlled unit
- G05G 5/03: Means for enhancing the operator's awareness of arrival of the controlling member at a command or datum position; Providing feel, e.g. means for creating a counterforce (arrangements for indicating the position of the controlling member G05G1/015)
- B60K 2026/023: {with electrical means to generate counter force or torque}
- B60Y 2306/09: Reducing noise
- B60Y 2400/702: Worm gearings
- F16H 2057/127: {using springs}
- 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
- G05G: CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY ("Bowden" or like mechanisms F16C1/10; gearings or mechanisms not peculiar to this purpose F16H; speed changing or reversing mechanisms for gearings conveying rotary motion F16H59/00 - F16H63/00)
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY

## Abstract

This power transmission device includes a motor, a worm connected to a rotating shaft of the motor, and a worm wheel engaged with the worm and disposed at an operation pedal side with respect to the worm, wherein a biasing member which biases the motor in a direction in which the worm and the worm wheel come in contact with each other when the motor is driven is disposed between the motor and a housing.

## Claims

### Claim 1

A power transmission device which transmits power to an operation portion, comprising:
a motor having a motor case disposed in a housing,
a worm connected to a rotating shaft of the motor, and
a worm wheel engaged with the worm and disposed at an operation portion side with respect to the worm,
wherein a biasing member is disposed at the one side with respect to engagement portions of the worm and the worm wheel; said biasing member being operable to bias one side of a worm wheel side and a worm side in a direction in which the worm and the worm wheel come in contact with each other when the motor is driven;
wherein said housing comprises a first restriction wall located on one end side in a rotating shaft direction with respect the motor case, and a second restriction wall located on the other side in the rotating shaft direction with respect to the motor case;
wherein the biasing member is located between the first restriction wall and the motor case at a position spaced away from the worm such that one end of the biasing member is in direct contact with the first restriction wall and the other end of the biasing member is in direct contact with the motor case;
wherein the biasing member is separate from the motor; and
wherein the biasing member is arranged around the rotating shaft such that a gap is formed between periphery of the rotating shaft and the biasing member.

### Claim 2 (depends on 1)

The power transmission device according to claim 1, further comprising a power transmission part disposed between the worm wheel and the operation portion to bias the operation portion toward an initial position, and
a clutch mechanism configured to allow the worm wheel and the power transmission part to be in a connected state when the motor is driven and also to allow the worm wheel and the power transmission part to be in a disconnected state when the motor is stopped and the operation portion is returned by a biasing force of the power transmission part.

### Claim 3 (depends on 1)

The power transmission device according to claim 1, wherein the biasing member is interposed between the motor case and the housing in which the motor is accommodated such that the motor case is separated from the first restriction wall by the biasing member.

### Claim 4 (depends on 1)

The power transmission device according to claim 1, wherein the biasing member biases the worm in a longitudinal direction of the worm such that tooth portions of the worm and worm wheel are in contact and a backlash in the engagement portions is filled.