公开(公告)号：US12292118B2

公开(公告)日：2025-05-06

申请号：US18839495

申请日：2022-11-16

Applicant: TPR Co., Ltd.

Inventor： Yushi Abe ,  Naoki Umeda ,  Masayuki Ohira ,  Akira Hikone

IPC: F16J9/20

Abstract: An outer circumferential surface of a piston ring has a cut surface forming a notched portion between an outer circumferential end surface and a lower surface, the cut surface including a first surface between the outer circumferential end surface and a bottom portion, and a second surface between the bottom portion and the lower surface. The second surface is inclined away from a central axis of the piston ring as it extends toward a crank chamber side, an angle of inclination of the second surface with respect to the bottom portion being greater than or equal to 50° and less than or equal to 85°. When an axial width of the piston ring is h1 and a distance in an axial direction between a connecting portion between the cut surface and the outer circumferential end surface and a connecting portion between the cut surface and the lower surface is H, H/h1 is greater than or equal to 0.2 and less than or equal to 0.4.

公开(公告)号：US11680537B2

公开(公告)日：2023-06-20

申请号：US17770749

申请日：2019-11-06

Applicant: TPR Co., Ltd. ,  TPR Industry Co., Ltd.

Inventor： Masayuki Ohira ,  Naoki Umeda ,  Seiji Tamaki ,  Takashi Sato ,  Takashi Oizumi

IPC: F02F1/00 ,  F02F1/20

CPC classification number: F02F1/004

Abstract: The present invention addresses the problem of providing a cylinder liner or a cylinder bore, which can reduce not only friction on a sliding surface but also oil consumption. In a piston sliding direction of the cylinder bore, grooves of a second sliding region positioned on the side of crankcase have a higher groove area ratio at a depth of 0.3 μm than grooves of a first sliding region positioned on the side of combustion chamber, and the groove area ratio is in a specific range, whereby friction and oil consumption can be reduced.

公开(公告)号：US20250116331A1

公开(公告)日：2025-04-10

申请号：US18839495

申请日：2022-11-16

Applicant: TPR Co., Ltd.

Inventor： Yushi Abe ,  Naoki Umeda ,  Masayuki Ohira ,  Akira Hikone

IPC: F16J9/20

Abstract: An outer circumferential surface of a piston ring has a cut surface forming a notched portion between an outer circumferential end surface and a lower surface, the cut surface including a first surface between the outer circumferential end surface and a bottom portion, and a second surface between the bottom portion and the lower surface. The second surface is inclined away from a central axis of the piston ring as it extends toward a crank chamber side, an angle of inclination of the second surface with respect to the bottom portion being greater than or equal to 50° and less than or equal to 85°. When an axial width of the piston ring is h1 and a distance in an axial direction between a connecting portion between the cut surface and the outer circumferential end surface and a connecting portion between the cut surface and the lower surface is H, H/h1 is greater than or equal to 0.2 and less than or equal to 0.4.

公开(公告)号：US20220372929A1

公开(公告)日：2022-11-24

申请号：US17770749

申请日：2019-11-06

Applicant: TPR Co., Ltd. ,  TPR Industry Co., Ltd.

Inventor： Masayuki Ohira ,  Naoki Umeda ,  Seiji Tamaki ,  Takashi Sato ,  Takashi Oizumi

IPC: F02F1/00

Abstract: The present invention addresses the problem of providing a cylinder liner or a cylinder bore, which can reduce not only friction on a sliding surface but also oil consumption. In a piston sliding direction of the cylinder bore, grooves of a second sliding region positioned on the side of crankcase have a higher groove area ratio at a depth of 0.3 μm than grooves of a first sliding region positioned on the side of combustion chamber, and the groove area ratio is in a specific range, whereby friction and oil consumption can be reduced.