Piston for reciprocating internal combustion engine

F - Mech Eng,Light,Heat,Weapons – 02 – F

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F02F 3/00 (2006.01) F16J 9/00 (2006.01) F16J 9/14 (2006.01)

Patent

CA 1218908

ABSTRACT OF THE DISCLOSURE A piston for a reciprocating internal combustion engine includes at least one pressure ring installed in an outer surface of the piston main body adjacent to the piston head. The pressure ring has a double-angle butt end construction comprising an outer circumferential surface slidably contacting the inner circumferential wall of the cylinder, a radially extending first butt flat end face, and a side wall facing the combustion chamber side, namely the high-pressure side, of the engine piston chamber. Only a corner portion formed on the combustion chamber side of the pressure ring by the outer circumferential surface, flat end face and side wall is partial- ly cut away to form a notch which is contiguous to the outer circumferential surface, end face and side wall. The pressure ring further includes a radially extending second butt flat end face opposing the first flat end face, and a rib projecting circumferentially from the second flat end face only at a po- sition corresponding to the notch, the rib having a shape which is complementary to that of the notch for being gas- tightly received by the notch when the pressure ring is installed in an outer circumferential groove of the piston main body. - 11 -

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