Patent Number: 6,253,723

Title: Automatic decompression valve for an internal combustion engine

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

Inventors: Edlund; Dag (Huskvarna, SE), Engman; Thomas (Mullsjo, SE)

Assignee: Aktiebolaget Electrolux

International Classification: F01L 13/08 (20060101); F02B 067/10 ()

Expiration Date: 07/03/2018