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公开(公告)号：US09845873B2
公开(公告)日：2017-12-19
申请号：US15266232
申请日：2016-09-15
Applicant: TPR CO., LTD.
Inventor： Noriaki Ayuzawa , Atsushi Nakazawa , Masahide Hama , Toshiyuki Shibuya
Abstract: A combination oil ring includes a pair of upper and lower side rails and a spacer expander arranged there between, the spacer expander including a plurality of upper pieces and lower pieces alternately arranged in a circumferential direction with the pieces axially and circumferentially apart from each other, a coupling piece coupling pieces adjacent to each other, and flange portions formed standing at inner circumferential-side end portions of the upper pieces and the lower pieces so as to press the side rails, and a through hole being formed in the flange portions, wherein side rail support portions that project axially are formed at portions in the circumferential direction of outer circumferential-side end portions of the upper pieces and the lower pieces.
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公开(公告)号：US20220145990A1
公开(公告)日：2022-05-12
申请号：US17608176
申请日：2020-12-17
Applicant: TPR Co., Ltd.
Inventor： Atsushi Nakazawa , Satoshi Minemura , Masahide Hama
Abstract: In a surface of a wire, a first side surface forming an outer circumferential surface in a piston ring includes a tapered surface and a protruding surface, the protruding surface is divided into a first part and a second part by a first virtual surface extending from the tapered surface, and the first part includes a top and is formed in a protruding shape.
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公开(公告)号：US10072755B2
公开(公告)日：2018-09-11
申请号：US15266270
申请日：2016-09-15
Applicant: TPR CO., LTD.
Inventor： Noriaki Ayuzawa , Atsushi Nakazawa , Masahide Hama , Toshiyuki Shibuya
Abstract: A combination oil ring includes a pair of upper and lower side rails and a spacer expander arranged there between, the spacer expander including a plurality of upper pieces and lower pieces alternately arranged in a circumferential direction with the pieces axially and circumferentially apart from each other, a coupling piece coupling pieces adjacent to each other, and flange portions formed standing at inner circumferential-side end portions of the upper pieces and the lower pieces so as to press the side rails, and a through hole being formed in the flange portions, wherein side rail support portions that project axially are formed at portions in the circumferential direction of outer circumferential-side end portions of the upper pieces and the lower pieces.
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公开(公告)号：US11603929B2
公开(公告)日：2023-03-14
申请号：US17608176
申请日：2020-12-17
Applicant: TPR Co., Ltd.
Inventor： Atsushi Nakazawa , Satoshi Minemura , Masahide Hama
Abstract: In a surface of a wire, a first side surface forming an outer circumferential surface in a piston ring includes a tapered surface and a protruding surface, the protruding surface is divided into a first part and a second part by a first virtual surface extending from the tapered surface, and the first part includes a top and is formed in a protruding shape.
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