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公开(公告)号：EP4056834A1
公开(公告)日：2022-09-14
申请号：EP19951589.1
申请日：2019-11-06
发明人： OHIRA, Masayuki , UMEDA, Naoki , TAMAKI, Seiji , SATO, Takashi , OIZUMI, Takashi
IPC分类号： F02F1/00
摘要： 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.
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公开(公告)号：EP4450795A1
公开(公告)日：2024-10-23
申请号：EP22928887.3
申请日：2022-11-16
申请人： TPR CO., LTD.
发明人： ABE, Yushi , UMEDA, Naoki , OHIRA, Masayuki , HIKONE, Akira
摘要： 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.
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