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US 6,668,703 B2Granted
Piston with oil trap
OwnerChristopher Gambleinventor
Life of this patent
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Abstract
A piston for a combustion engine having an oil ring groove on the exterior of the piston which communicates via oil holes with an oil trap extending around the interior of the piston. The oil trap captures lubricant on the downward stroke and pumps lubricant to the piston and cylinder walls on the upward stroke. An oil ring assembly having a wiper, expander and oil ring sections may be provided in the oil ring groove. A bridge may also be provided to support the cylinder head.
Claims9
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.
4 more elements
Dependencies are inferred from the claim text.