公开(公告)号：US20230272854A1

公开(公告)日：2023-08-31

申请号：US18026151

申请日：2021-07-30

Applicant: TPR Co., Ltd.

Inventor： Hiroyuki Nagakura ,  Shuichi Inamori ,  Akira Hikone

IPC: F16J9/20 ,  F16J9/06

CPC classification number: F16J9/20 ,  F16J9/06

Abstract: A combination of piston rings assembled to a piston includes a first compression ring, a second compression ring, a third compression ring and an oil ring. When an axial width of the first compression ring is h1(1), an axial width of the second compression ring is h1(2), an axial width of the third compression ring is h1(3) and an axial width of the oil ring is h1(4), h1(1) ≥ h1(2) and h1(1) ≥ h1 (3), and when h1 (TOTAL) = h1 (1) + h1(2) + h1(3) + h1 (4), h1 (TOTAL) ≥ 3.9 mm.