Piston ring
AssigneeRiken
InventorsDaisuke Sato, Shuichi Kamura
Life of this patent
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Abstract
Provided is a piston ring excellent in peeling resistance, wear resistance, and thermal conductivity. A piston ring 1 includes: an annular main body 2 having a pair of side faces 2a and 2b, an outer peripheral face 2d, and an inner peripheral face 2c; and a hard coating 11 provided on the outer peripheral face 2d. When a width of the main body 2 in a first direction D1 perpendicular to the pair of side faces 2a and 2b is set to h1 mm, a width of the hard coating 11 in the first direction D1 is set to W mm, and a thickness of the hard coating 11 in a second direction D2 perpendicular to the outer peripheral face 2d is set to L mm, the following Formula (1) is satisfied: 0.003≤(L·h1)/W≤0.151.
Claims12
A piston ring comprising:
- an annular main body having a pair of side faces, an outer peripheral face, and an inner peripheral face;
- and
- a coating film provided on the outer peripheral face,
- wherein a thermal conductivity σ of the coating film is lower than that of the main body, and the thermal conductivity σ of the coating film is 5 W/m·K or more,
- wherein a thickness of the coating film from a vertex of the coating film in a second direction to a position 0.3 mm away from the vertex ranges from 3 μm or more to 10 μm or less, and
- wherein the piston ring satisfies a following Formula (1) when a width of the main body in a first direction perpendicular to the pair of side faces is set to h1 mm, a width of the coating film in the first direction is set to W mm, and the thickness of the coating film in the second direction perpendicular to the outer peripheral face is set to L mm
- 0.003≤(L·h1)/W≤0.151 (1).
Dependencies are inferred from the claim text.