Method for producing piston rings
US9352427B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 2, 2012 |
| Grant date | May 31, 2016 |
| Priority date | — |
| Expiry date | Mar 10, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49284
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method for producing a recessed steel piston ring provided with a wear-resistant layer includes generating a main body that has a recess on the running surface side and that, in the region where a lower flank of the main body transitions into the running surface is worked so that a chamfer is created, providing the running surface and at least portions of the chamfer with at least one wear-resistant layer, nitriding the circumferential surface and the lower and upper flanks of the main body that are not provided with the wear-resistant layer so that a section having a defined width and having no nitride layer remains on the flank adjacent the chamfer, and removing the at least one wear-resistant layer to such an extent that a substantially sharp, but unnitrided functional edge is created in the region where the lower flank transitions into the running surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.