Patent ID: 6257180
Filing Date: 2001-07-10
Classification: F02B

Abstract:
In a two stroke internal combustion engine comprising an elongate power cylinder having a piston operatively connected to a drive shaft through a connecting rod and mounted for reciprocating movement therein between a top dead center position adjacent a first end of said power cylinder and a bottom dead center position adjacent a second end of said power cylinder, an air inlet adjacent said first end of said power cylinder interconnecting said power cylinder with a source of compressed air, an automatic pressure-responsive valve mounted within said air inlet, and an exhaust outlet positioned away from said second end of said power cylinder a sufficient distance such that said exhaust outlet is entirely exposed only when said piston is at said bottom dead center position and is at least partially blocked by said piston at all other times, a method of conducting a two stroke cycle within said power cylinder comprising the steps of:a. compressing a charge of air;b. admitting said charge of compressed air into said power cylinder in response to a pressure differential across said pressure responsive valve created by the downwardly moving piston, exposing said exhaust outlet, said charge of compressed air being admitted while said exhaust outlet is at least partially exposedc. compressing said air in the power cylinder by the upwardly moving piston with exhaust port closed and while adding fuel to said charge of air during such compression to create a compressed air/fuel mixture;d. combusting said air/fuel mixture to drive said piston downward through said power cylinder; ande. ventilating combustion products from said power cylinder at the instant that said piston begins to expose said exhaust port during a downstroke of said piston and simultaneously with admitting fresh, cool, compressed air into said power cylinder to create an airflow along a longitudinal axis of said power cylinder from said air inlet to said exhaust outlet; whereby the creation of an airflow along a longitudinal axis of said power cylinder from said air inlet to said exhaust outlet cools said power cylinder as such air travels from said air inlet to said exhaust outlet.