Lubricant-cooled and wristpin lubricating piston

摘要

A piston for an internal combustion engine including a skirt ( 32 ) and a crown ( 34 ). The skirt includes a top portion ( 48 ) and a cylindrically-shaped wall portion ( 50 ) extending from the top portion defining a skirt cavity ( 82 ). The top portion includes upper and lower surfaces. The lower surface is configured to define a bearing surface ( 72 ) for the wristpin ( 98 ). The crown is coupled to the skirt and includes a lower surface in facing relation to the upper surface. The lower surface of the crown and the upper surface define a lubrication cavity ( 46 ). The top portion includes at least one inlet hole ( 84 ) adapted to supply a lubricant from the skirt cavity to the lubrication cavity. The top portion includes at least one lubrication hole ( 90 ) adapted to supply the lubrication cavity to the bearing surface and the wristpin.