# US 4,395,980 A · Overhead cam shaft type V-engine for vehicles

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- Number: US 4,395,980 A
- Document ID: US4395980A
- Status: Granted
- Kind: A
- Application number: 06/236,603
- Filed: 1981-02-20
- Granted: 1983-08-02
- Earliest claimed: 1980-02-26
- Assignees: Yamaha Hatsudoki Kabushiki Kaisha
- Inventors: Nobuyoshi Tominaga; Nobuyoshi Kurai; Hajime Ueno; Sadahide Suzuki
- Web page: https://patentgrep.com/patent/US4395980A

## CPC

- F01L 1/024: {Belt drive}
- F01L 1/053: overhead type
- F02B 61/02: for driving cycles
- F02B 75/22: with cylinders in V, fan, or star arrangement
- F02B 2075/027: {four}
- F02B 2075/1808: {two}
- F02B 2275/08: Endless member is a chain
- F02B 2275/20: SOHC [Single overhead camshaft]
- F01L: CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G)

## Abstract

A motorcycle carries a multiple cylinder overhead cam shaft V-type engine whose cylinders are inclined in the plane of longitudinal (forward) movement of the vehicle. One cylinder (preferably the forward cylinder) is laterally offset to the right, and the other is laterally offset to the left. An overhead cam shaft is provided for each cylinder, and is driven by a drive located on the respective cylinder on the outside, in the direction of offset. An ignition plug and its cord are mounted on the opposite side, whereby to be shielded from obstacles by structure associated with the neighboring cylinder.

## Claims

### Claim 1

In combination with a wheeled vehicle having a forward direction of motion, an overhead cam-shaft V-type engine comprising a front and rear cylinder, said cylinders being inclined to the vertical and parallel to a vertical plane which includes the said direction, when the vehicle is upright, said cylinders being laterally offset relative to said direction, oppositely from one another; an overhead cam shaft on each cylinder; cam shaft drive means disposed along each respective cylinder on the outside thereof in the direction of the respective offset; an ignition plug and cord respective to each cylinder mounted thereto on the opposite side thereof, whereby structure associated with each cylinder projects laterally beyond the ignition plug of the other cylinder and thereby protects it from striking obstacles.

### Claim 2 (depends on 1)

A combination according to claim 1 in which said vehicle includes a frame which at least partially shields the front ignition plug.

### Claim 3 (depends on 1)

A combination according to claim 1 in which the vehicle is a motorcycle, and the front cylinder is offset to the right, whereby when a motorcyclist on the left walks his cycle forwardly, the rear plug is protected by the structure associated with the forward cylinder, and the forward plug is inherently protected because of the side clearance the motorcyclist will provide for himself.

### Claim 4 (depends on 1)

A combination according to claim 1 in which a cooling passage is formed beneath said cam shaft and in communication with said plug on the side of the front cylinder opposite from said cam shaft drive means.