Piston ring and engine
US10634249B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 10, 2015 |
| Grant date | Apr 28, 2020 |
| Priority date | — |
| Expiry date | Nov 13, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C16/26
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A piston ring in which carbon films with film qualities optimized to be adapted to required performance are formed on an outer circumferential sliding surface and top and bottom surfaces thereof with good productivity is provided, and a high-performance engine which employs the piston ring is also provided. In the piston ring, a carbon film is formed on an outer circumferential sliding surface and top and bottom surfaces. The carbon film contains a stacking of at least two types of carbon film layers with different film qualities, and a thickness ratio of the two types of carbon film layers is different between the outer circumferential sliding surface and the top and bottom surfaces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.