Slanted internal combustion engine

Details Slanted internal combustion engine Slanted internal combustion engine

1999-12-14

2001-10-23

Kamen, Noah P. (Department: 3747)

Internal-combustion engines

Frame construction

Horizontal cylinder

C123S1950HC

Reexamination Certificate

active

06305340

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an internal combustion engine, and more particularly, to an internal combustion engine of which a cylinder axis is slanted.
2. Background Art
Variety of internal combustion engines whose cylinders axes are slanted with respect to a vertical axis have been proposed to reduce the overall height of the engines.
For example, Japanese Patent Application Laid-open No. Toku-Kai-Hei 4-362270 discloses a slanted SOHC (Single Over-Head Cam) internal combustion engine of which a camshaft is provided above the cylinder axis so that the intake and exhaust valve train is disposed at a low position.
Further, Japanese Patent Application Laid-open No. Toku-Kai-Hei 10-280932 proposes a slanted OHC (Over-Head Cam) internal combustion engine, in which intake and exhaust valves are disposed below the cylinder axis, a rocker arm is disposed below the intake and exhaust valves, and a push rod is accommodated in a push rod chamber formed along the lower surface of a cylinder. The push rod is connected at the lower end thereof with a tappet driven by a camshaft disposed in a crankcase.
Generally, a valve train chamber for accommodating a rocker arm is formed above a cylinder head. Accordingly, as shown in the disclosure No. Toku-Kai-Hei 4-362270, in case of an engine whose camshaft is disposed above the cylinder axis, a large diameter of a camshaft sprocket projected above makes it difficult to reduce the overall height of the engine.
On the other hand, as disclosed in Toku-Kai-Hei 10-280932, in case of an engine whose rocker arm is disposed below the intake and exhaust valves, since the rocker arm is supported by a rocker shaft provided in the cylinder head, the valve train chamber encloses at least the lower half of the cylinder head, as a result it is impossible to dispose a spark plug at an optimal position for combustion. Particularly, in case of an air-cooled engine, the positional selection of the spark plug is a big problem for its cooling characteristic.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a slanted internal combustion engine capable of reducing the overall height of the engine and disposing a spark plug at an optimal position in view of the combustion and cooling performance.
An internal combustion engine of which a cylinder is slanted toward a crankcase, comprises intake and exhaust valves provided in a cylinder head and below a combustion chamber and a camshaft provided below the intake and exhaust valves for driving the intake and exhaust valves through a rocker arm.
Further, an air vent is provided at the central part of a casing for accommodating a valve driving mechanism.


REFERENCES:
patent: 4223647 (1980-09-01), Castarede
patent: 4692123 (1987-09-01), Tada et al.
patent: 5884593 (1999-03-01), Immel et al.
patent: 5887563 (1999-03-01), Shudo et al.
patent: 5960751 (1999-10-01), Isoshima
patent: 5992355 (1999-11-01), Shichinohe et al.
patent: 4362270 (1992-12-01), None
patent: 10280932 (1998-10-01), None

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