Slide exhaust control valve for fuel injected two-stroke cycle engines and process for using same
AssigneePerformance Industries, Inc.
InventorEyvind Boyesen
Life of this patent
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Abstract
A sliding exhaust control valve for two-stroke cycle engines is disclosed. This valve actuates at least partially through the exhaust passage and delays flow from the combustion chamber through the exhaust passage during the expansion stroke of the piston while permitting full opening of the exhaust passage and giving complete blow down before the scavenging cycle of the engine. Also disclosed is a mechanical linkage mechanism between the slide valve and the crankshaft and cam controlled actuation means to provide precise control of the exhaust valve throughout the engine cycle.
Claims23
In a two-stroke cycle internal combustion engine having an air intake passage, an exhaust port leading to an exhaust passage, a piston reciprocating in continuous cycles between top and bottom dead center positions in a cylinder, said piston being interconnected with a rotatable crankshaft, at least one transfer passage providing compressed air to a combustion chamber above the piston, and valve means within the exhaust passage adapted to control flow through the exhaust passage, the improvement in said valve means comprising
- a slide valve member which actuates at least partially through said exhaust passage;
- actuating means for said valve member to move said valve member between an extended position closest to said cylinder and a retracted position;
- and
- said actuating means being in timed relation with said crankshaft rotation and piston movement to move said valve member from said extended position toward said retracted position after the upper edge of said piston passes downward below the upper edge of the exhaust port, and to move said valve member from said retracted position toward said extended position when said piston is near its bottom dead center position.
In a two-stroke cycle internal combustion engine including a cylinder, a combustion chamber in the cylinder, an exhaust port spaced from and below the upper end of the combustion chamber leading to an exhaust passage, and a piston carried within said combustion chamber for reciprocation between top and bottom dead center positions, said piston being interconnected with a rotatable crankshaft and functioning as a valve member to open and close said exhaust port, and valve means within the exhaust passage adapted to control flow through the exhaust passage, the improvement comprising
- said valve means comprising a slide valve element which actuates at least partially through said exhaust passage;
- actuating means for said valve element to move said valve element between an extended position, restricting fluid flow through said exhaust passage, and a retracted position, providing free fluid flow through said exhaust passage;
- and
- said actuating means being in timed relation with said crankshaft rotation and piston movement to move said valve element from an extended position toward a retracted position as the piston passes downward, and to move said valve element from the retracted position toward the extended position when said piston is near its bottom dead center position.
Dependencies are inferred from the claim text.