| 摘要 |
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 to 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. <IMAGE> |
