# US 10,119,594 B2 · Balancer device of engine and motorcycle

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- Number: US 10,119,594 B2
- Document ID: US10119594B2
- Status: Granted
- Kind: B2
- Application number: 15/296,613
- Filed: 2016-10-18
- Published: 2017-04-27
- Granted: 2018-11-06
- Earliest claimed: 2015-10-27
- Assignees: Suzuki Motor Corporation
- Applicants: Suzuki Motor Corporation
- Inventors: Kohei Tsukamoto; Shintaro Yagi; Tomoyuki Oda
- Web page: https://patentgrep.com/patent/US10119594B2

## CPC

- F16F 15/264: {Rotating balancer shafts (F16F15/262 takes precedence)}
- F02B 61/02: for driving cycles
- F16F 15/265: {Arrangement of two or more balancer shafts (F16F15/267 takes precedence)}
- F16F 2232/02: Rotary
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)

## Abstract

There is provided a balancer device of an engine. The balancer device is configured to reduce rotation vibrations of the engine. A crankshaft is disposed on a mating surface of a crank case divided into an upper case and a lower case. A balancer shaft is disposed below the crankshaft. A balancer housing accommodates therein the balancer shaft. The balancer shaft is disposed on a mating surface between the lower case and the balancer housing.

## Claims

### Claim 1

A balancer device of an engine, configured to reduce rotation vibrations of the engine, the balancer device comprising:
a crankshaft disposed on a mating surface of a crank case divided into an upper case and a lower case;
a balancer shaft disposed below the crankshaft; and
a balancer housing accommodating therein the balancer shaft,
wherein the balancer shaft is disposed on a mating surface between the lower case and the balancer housing, and
wherein the balancer shaft is disposed at an opposite side to a side stand configured to support a vehicle body with respect to the right-left direction.

### Claim 2 (depends on 1)

The balancer device according to claim 1, wherein the upper case, the lower case and the balancer housing are fastened together by a fastening bolt.

### Claim 3 (depends on 1)

The balancer device according to claim 1, wherein the balancer housing is formed to cover the balancer shaft.

### Claim 4 (depends on 1)

The balancer device according to claim 1, wherein the balancer shaft is disposed at one side of the engine in a right-left direction of the engine and an oil passage extending in a front-rear direction of the engine is provided at the other side of the engine.

### Claim 5 (depends on 1)

A motorcycle comprising the balancer device according to claim 1.

### Claim 6

A balancer device of an engine, configured to reduce rotation vibrations of the engine, the balancer device comprising:
a crank case having an opening at a side thereof;
a crankshaft disposed in the crank case;
a balancer shaft disposed below the crankshaft;
a clutch cover attached to cover the opening of the crank case; and
a balancer housing accommodating therein the balancer shaft,
wherein
at least a part of the balancer shaft is positioned within the opening such that the part of the balancer is visible through the opening as seen in an orthographic side view from the outside of the engine in a state where the clutch cover is detached from the crank case,
a bearing configured to support the balancer shaft is positioned at an inner side of the opening of the crank case, as seen from a side of the engine, and
the bearing is formed by the crank case and the balancer housing.

### Claim 7 (depends on 6)

The balancer device according to claim 6, wherein the balancer shaft is disposed at the same side as a clutch with respect to a right-left direction of the engine.

### Claim 8 (depends on 6)

The balancer device according to claim 6, wherein an end portion of the crankshaft is provided with a primary drive gear configured to drive the balancer shaft.

### Claim 9 (depends on 6)

A motorcycle comprising the balancer device according to claim 6.