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

F - Mech Eng,Light,Heat,Weapons

01

L

F01L 13/08 (2006.01) F02N 99/00 (2010.01)

Patent

CA 2282992

An automatic valve for reducing compression in order to facilitate starting of a two-stroke internal combustion engine comprises a movable valve means (25) adapted to control a gas flow through an opening (16) provided in a wall of the combustion chamber of the engine. A spring (27) is adapted to move the valve means (25) to an open position, and a drive means actuated by an underpressure is adapted to move the valve means (25) to a closed position against the action of the spring (27). According to the invention, the drive means comprises a cylinder (18), a piston (19) movable in said cylinder (18) and connected to said valve means (25), and a conduit (22) connecting said cylinder (18) to a source of underpressure. A one-way valve (23) is provided in said conduit (22) for allowing an air flow in a direction from said cylinder (18) only, and a leak passage (30) is adapted tc allow a small flow of air into said cylinder (18) for facilitating the opening of said valve means (25) when the operation of the engine has been stopped.

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