Piston ring
AssigneeRiken
InventorsHayato Sasaki, Takashi Ono, Toshikatsu Hayashi, Kouhei Sugimoto
Life of this patent
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Abstract
Disclosed is a piston ring that, in an engine where high temperature is reached in the vicinity of the piston ring, is capable of sustaining an excellent effect of preventing aluminum cohesion over a prolonged period of time. The piston ring having a resin-based coating formed on at least one of an upper surface and a lower surface of a piston ring body, the resin-based coating including a first resin-based coating containing plate-like filler having a mean particle diameter of 2 μm to 20 μm and an aspect ratio of 20 to 200 and a second resin-based coating located under the first resin-based coating and containing hard particles having a mean particle diameter of 0.01 μm to 1 μm.
Claims8
A piston ring having a resin-based coating formed on at least one of an upper surface and a lower surface of a piston ring body, wherein
- the resin-based coating comprises a first resin-based coating containing a plate-like filler having a mean particle diameter of 2 μm to 20 μm and an aspect ratio of 20 to 200, and a second resin-based coating located closer to the piston ring body than the first resin-based coating and containing hard particles having a mean particle diameter of 0.01 μm to 1 μm,
- a surface immediately under the second resin-based coating has a plateau structure having plateau portions and valley portions,
- a mean width of the valley portions is approximately the same as the mean particle diameter of the hard particles in the second resin-based coating, and
- some of the hard particles are inserted in the valley portions of the plateau structure and protrude from the surface of the plateau portions.
Dependencies are inferred from the claim text.