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.

公开(公告)号：US20250109722A1

公开(公告)日：2025-04-03

申请号：US18851051

申请日：2023-02-07

Applicant: TPR Co., Ltd.

Inventor： Hiroyuki Nagakura ,  Shuichi Inamori ,  Kiyoyuki Kawai

IPC: F02F5/00 ,  F02F3/00 ,  F16J9/12

Abstract: A piston unit adapted to reciprocate in a cylinder includes a piston and a top land member attached to the piston. The piston includes a first portion including a piston end at one end surface side and fitted with the top land member. The first portion has a smaller outer diameter than a second portion such that there is a step therebetween. The second portion is the other portion of the piston than the first portion. The top land member has a groove wall forming surface opposed to a step surface that connects the outer circumferential surface of the first portion and the outer circumferential surface of the second portion. The first ring groove is defined by the groove wall forming surface, the step surface, and the outer circumferential surface of the first portion.

公开(公告)号：US12000491B2

公开(公告)日：2024-06-04

申请号：US18026144

申请日：2021-07-30

Applicant: TPR Co., Ltd.

Inventor： Hiroyuki Nagakura ,  Shuichi Inamori ,  Akira Hikone

IPC: F16J9/06 ,  F16J9/20

CPC classification number: F16J9/06 ,  F16J9/20 ,  F16J9/203

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)≥3.1 mm.

公开(公告)号：US12117084B2

公开(公告)日：2024-10-15

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.

公开(公告)号：US20230358313A1

公开(公告)日：2023-11-09

申请号：US18026144

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)≥3.1 mm.