PISTON SEALING FOR INTERNAL COMBUSTION ENGINE (VERSIONS) Russian patent published in 2010 - IPC F02F5/00 

FIELD: engines and pumps.

SUBSTANCE: piston sealing includes upper (4) and lower (5) compression rings installed in piston groove (3), between which there located is sealing ring (6) the outer diametre of which is equal to outer diametre of rings (4) and (5). In internal cavity of piston groove (3) there located is piston ring expander (7) the surface of outer diametre of which is borne against surfaces of inner diametres of rings (4) and (5). In upper and lower part of piston ring expander (7) there made are annular flanges entering annular cavities at the bottom of piston groove (3). Inner diametre of ring (6) is supported on projection of the surface of outer diametre of expander (7). As per version 2, between rings (4) and (5) there located are at least two sealing rings (6) separated from each other with intermediate compression ring (8). The surface of outer diametre of piston ring expander 7 is borne against surfaces of inner diametres of compression rings (4), (5) and (8), and its annular flanges enter the appropriate annular cavities at the bottom of piston groove (3). As per versions 1 and 2, in piston groove (3) above ring (4) there installed is stepped flexible split ring (9) with a gap relative to cylinder (1), and its step bears against inner space of annular flange made on upper flange of piston groove (3).

EFFECT: increasing compression, power and service life of engine, reducing fuel and oil flow, and improving its environmental characteristics.

4 cl, 2 dwg