Patent ID: 7762227
Filing Date: 2010-07-27
Classification: F02F

Abstract:
1. A coolable piston for internal combustion engines comprising: a head portion extending along a longitudinal axis with a crown and an annular wall extending away from said crown along said longitudinal axis, said annular wall unitary and integrally-formed with respect to said crown and defining at least one ring groove for receiving a piston ring; a first shoulder in said annular wall defined between a first inner diameter of said annular wall and a second diameter of said annular wall; a second shoulder in said annular wall adjacent to said first shoulder along said longitudinal axis and defined between said second inner diameter of said annular wall and a third diameter of said annular wall; a collar formed on a distal end of said annular wall and flanged over to project radially inwardly from said distal end; an annular rib extending from said crown and within said annular wall and thereby defining an annular cavity with said annular wall, said annular cavity extending along said longitudinal axis from a first end closed by said crown to a second end at said distal end of said annular wall; first and second pin bosses disposed at a distal end of said annular rib spaced from said crown, said first and second pin bosses for receiving a pin for connecting rod; an annular notch formed in said annular rib and substantially opposing said first shoulder along said longitudinal axis; a ring member closing said second end of said annular cavity, said ring member releasably engaged with both of said annular rib and said annular wall for servicing, said ring member having an inner periphery supported against movement along said longitudinal axis by being received in said annular notch, said ring member having an outer periphery disposed between said first shoulder and said second shoulder along said longitudinal axis; and a locking ring disposed in said collar against said second shoulder and supporting said outer periphery of said ring member against movement along said longitudinal axis.