Piston ring for engine and machining method of piston ring
US11788622B2 · kind B2 · utility
0Cited by
3References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 10, 2021 |
| Grant date | Oct 17, 2023 |
| Priority date | — |
| Expiry date | Nov 10, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D7/04
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A piston ring for an engine may include a piston ring body. The piston ring body may include a working surface, a lower surface, an upper surface, and an inner surface. An area of the working surface and/or the lower surface which is close to an outer circumferential lower edge of the piston ring body is not provided with a nitride layer, the outer circumferential lower edge is formed with a chamfer, the chamfer does not have a nitride layer, and an additional area of the piston ring has a nitride layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.