Automatic decompression valve for an internal combustion engine

Details Automatic decompression valve for an internal combustion engine Automatic decompression valve for an internal combustion engine

1999-10-01

2001-07-03

Wolfe, Willis R. (Department: 3747)

Internal-combustion engines

Starting device

Compression relieving type

Reexamination Certificate

active

06253723

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to an automatic valve for reducing compression during start of a two-stroke internal combustion engine, comprising a movable valve adapted to control a gas flow through an opening in a wall of the combustion chamber of the engine, a resilient means for moving the movable valve to an open position, and a driver actuated by an underpressure and adapted to move the movable valve to a closed position against the action of the resilient means.
The decompression valve according to the invention has the purpose of facilitating the starting of internal combustion engines of the type started either manually by means of a rope starter or the like, or by an electric starter motor. For the intended purpose, a plurality of valve designs adapted to automatic operation have been previously proposed. Such prior art valves are disclosed in, for example, DE 1949541, U.S. Pat. No. 5,050,546 and DE 4403609. It has appeared, however, that the prior art valves known from these publications do not operate satisfactorily and, as far as is known, have therefore not been used in practice.
SUMMARY OF THE INVENTION
It is an object of the present invention to avoid the problems and disadvantages encountered in connection with prior art valve designs and to provide an automatic decompression valve having a good reliability and operability in practical use. The present invention achieves this result by means of a decompression valve of the kind mentioned in the introduction in which the driver includes a cylinder, a piston is movable in the cylinder and connected to the movable valve, a conduit connects the cylinder to a source of underpressure, a one-way valve provided in the conduit for allowing an air flow in a direction a way from the cylinder only, and a leak passage is adapted to allow a small flow of atmospheric air into said cylinder for facilitating opening of the movable valve when the operation of the engine has been stopped.


REFERENCES:
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patent: 3782354 (1974-01-01), Tuckey
patent: 3893440 (1975-07-01), Dooley
patent: 3919991 (1975-11-01), Neschke et al.
patent: 4619228 (1986-10-01), Liu
patent: 5007391 (1991-04-01), Nomoto
patent: 5050546 (1991-09-01), Nomoto
patent: 5211140 (1993-05-01), Hironaka

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