公开(公告)号：US11313466B2

公开(公告)日：2022-04-26

申请号：US16555573

申请日：2019-08-29

Applicant: GM Global Technology Operations LLC

Inventor： Balakrishna Chinta ,  John B Fisher ,  Zheng Ma

IPC: F16J9/20 ,  F16J1/08 ,  F16J1/00 ,  F02F5/00

Abstract: A piston assembly for an internal combustion engine of a motor includes a piston head having an outer diameter surface spaced a first distance from the longitudinal axis and an annular surface spaced a second distance from the longitudinal axis, with the second distance being less than the first distance. Upper and lower walls extend between the annular surface and the outer diameter surface so as to define an annular groove in the outer diameter surface. A piston ring is received within the annular groove and includes an inner diameter surface facing the annular surface of the piston head. The inner diameter surface of the piston ring and the annular surface of the piston head cooperate with one another to define a plurality of pockets angularly spaced from one another about the longitudinal axis and configured to receive oil.