Patent ID: 8347842
Filing Date: 2013-01-08
Classification: F02F

Abstract:
1. A piston for an internal combustion engine, comprising: a head portion having an annular wall extending along a central longitudinal axis between a crown at an upper proximal end and a lower distal end; a first shoulder in said annular wall, said first shoulder extending between a first inner diameter of said annular wall and a second inner diameter of said annular wall; a second shoulder in said annular wall adjacent said first shoulder, said second shoulder extending between said second inner diameter of said annular wall and a third inner diameter of said annular wall; a collar formed on said lower distal end of said annular wall and flanged over to project radially inwardly toward said central longitudinal axis; an annular rib depending from said crown within said annular wall and providing an annular cavity between said annular rib and said annular wall, said annular cavity extending along said central longitudinal axis from a first end closed by said crown to an open second end; first and second pin bosses provided at a distal end of said annular rib; an annular channel formed in said annular rib; a ring member at least partially closing said second end of said annular cavity and being supported against movement along said longitudinal axis by an inner periphery of said ring member received in said annular channel and having an outer periphery disposed between said first shoulder and said second shoulder; 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 central longitudinal axis.