TWO-STROKE INTERNAL COMBUSTION ENGINE Russian patent published in 1994 - IPC

FIELD: engine engineering. SUBSTANCE: pistons of the engine has under- piston spaces coupled with outlet of a by-pass passage through an additional valve. The passage is made of an additional cylinder with axis inclined to axis of the cylinder and located coaxially to an outlet port wherein an additional piston is received for reciprocation. The piston has axial dummy opening conjugated with a guide rod positioned within the additional cylinder from the side of the outlet of the by-pass passage and provided with axial opening coupled with the under-piston spaces. EFFECT: enhanced efficiency. 2 dwg