INTERNAL COMBUSTION ENGINE Russian patent published in 1994 - IPC

FIELD: engine engineering. SUBSTANCE: engine has crank-chamber blowing, crankshaft 6 with webs 7 and counter-weights positioned on them. Toroidal groove 12 is provided on edge of each counter- weight in plane of its rotation from the side of inlet opening 11. Generatrix of the groove is made of an arc 13 in plane passing through rotation axis of the counter- weight and restricted by side surface 14 of the counter- weight from the one side and face plane 15 from the other side. Point of intersection of arc 13 with face plane 15 is located at a distance from axis of counter-weight rotation which is no less than minimum distance from the edge of inlet opening 11 to axis of rotation of the counter-weight. EFFECT: enhanced efficiency. 3 cl, 3 dwg