Rotary exhaust valve for two-stroke engine

摘要

A two-stroke engine with a rotary exhaust valve being provided in the vicinity of the exhaust part of the engine; the rotary exhaust valve rotates in a contrary direction to the rotating direction of the engine crank and at a speed equal to one-half that of the crank. During final exhaust stage, the exhaust passage is closed so as to prevent the fresh fuel gas from being exhausted before being burned.