US 2019/0195363 A1Published application

Piston ring

AssigneeRiken

InventorsHiroshi SHIMIZU, Daisuke NAKAMURA

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Abstract

A piston ring has an annular body including an inner circumferential surface, an outer circumferential surface and first and second side surfaces connecting the inner circumferential surface and the outer circumferential surface, and a joint section. The joint section includes a first protrusion portion, a first reception portion, a second protrusion portion, a second reception portion, a first male portion, a first female portion, a second male portion and a second female portion. The first male portion includes a first mating surface and a first contact surface located adjacent the first mating surface and including either an inclined surface or a curved surface. The second male portion includes a second mating surface and a second contact surface located adjacent the second mating surface including either an inclined surface or a curved surface.

Claims21

Dependent claims

A piston ring comprising:

an annular body including an inner circumferential surface, an outer circumferential surface and first and second side surfaces connecting the inner circumferential surface and the outer circumferential surface;
and
a joint section including first and second joint ends opposed to each other and formed in the body,
wherein the joint section comprises:
a first protrusion portion located adjacent the first side surface and that protrudes from the first joint end toward the second joint end and a first reception portion that receives the first protrusion portion in the second joint end;
a second protrusion portion located adjacent the second side surface and that protrudes from the second joint end toward the first joint end, and a second reception portion that receives the second protrusion portion in the first joint ends;
a first male portion that protrudes from the second protrusion portion toward the second reception portion, and a first female portion that receives the first male portion in the second reception portion;
and
a second male portion that protrudes from the second reception portion toward the second protrusion portion, and a second female portion that receives the second male portion in the second protrusion portion,
wherein the first male portion includes a first mating surface and a first contact surface located adjacent the first mating surface, the first contact surface including either an inclined surface with respect to the first mating surface or a curved surface having a convex shape so that a front end of the first male portion is tapered, and
wherein the second male portion includes a second mating surface configured to contact the first mating surface, and a second contact surface located adjacent the second mating surface, the second contact surface including either an inclined surface with respect to the second mating surface or a curved surface having a convex shape so that a front end of the second male portion is tapered.

8 more elements

A piston ring comprising:

an annular shaped body having a separable joint section and configured to detachably connect around a piston body;
a first joint end of the joint section including a first male portion and a first reception portion, wherein the first male portion comprises:
a first mating surface located adjacent the first reception portion;
a first end portion extending in a circumferential direction of the annular shaped body;
and
a first contact surface located between the first mating surface and the first end portion, the first contact surface tapered from the first end portion back towards the first mating surface;
and
a second joint end of the joint section configured to detachably connect to the first joint end and including a second male portion and a second reception portion, wherein the second male portion comprises:
a second mating surface located adjacent the second reception portion and configured to abut against the first mating surface when the second joint end is connected to the first joint end;
a second end portion extending toward the first reception portion;
and
a second contact surface located between the second mating surface and the second end portion, the second contact surface tapered from the second end portion back towards the second mating surface,
wherein the second contact surface is configured to slidingly contact the first contact surface to provide an initial point of contact between the second joint end and the first joint end when the annular shaped body is connected around the piston body.

10 more elements

Dependencies are inferred from the claim text.