Patent ID: 6668703
Filing Date: 2003-12-30
Classification: F02F

Abstract:
A piston for an internal combustion engine of the type being reciprocal within a cylinder comprising:(a) a generally cylindrical side wall having a head and defining an interior cavity having an interior wall; (b) an annular compression ring groove in said side wall; (c) an annular oil ring groove in said side wall; (d) an oil trap disposed in said cavity opposite said oil ring groove having a bottom surface extending to capture oil; (e) at least one aperture extending through said side wall at said oil ring groove whereby lubricant is captured as the piston reciprocates in one direction and is pumped through said aperture to said oil trap as the piston reciprocates in the opposite direction; and (f) said oil trap comprising an annular member having a bottom surface which extends from said interior wall of said cavity upwardly at an acute angle.