US4395980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overhead cam shaft type V-engine for vehicles
Assignee: Yamaha Motor Co Ltd
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Filing: 1981-02-20
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Granted: 1983-08-02
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Expires: 2001-02-20
Abstract
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.
Inventors
- 👤 Nobuyoshi Tominaga
- 👤 Nobuyoshi Kurai
- 👤 Hajime Ueno
- 👤 Sadahide Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:50
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/02; F01L1/024; F01L1/04; F01L1/047; F01L1/053; F02; F02B; F02B61/00; F02B61/02; F02B75/00; F02B75/16; F02B75/18; F02B75/22; F02B75/02; F02B2075/022; F02B2075/027; F02B2075/1804; F02B2075/1808; F02B2275/00; F02B2275/08; F02B2275/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
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
Dependent Claim
125 words
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 3
Dependent Claim
22 words
A combination according to claim 1 in which said vehicle includes a frame which at least partially shields the front ignition plug.
Claim 4
Dependent Claim
64 words
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 5
Dependent Claim
37 words
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.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |