Rolled metal piston ring
US4214762A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1978 |
| Grant date | Jul 29, 1980 |
| Priority date | — |
| Expiry date | Aug 3, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/924
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A rolled steel oil control piston ring for internal combustion engines is of generally U-shaped cross section with a pair of opposed rigid sidewalls projecting inwardly of the ring from a central peripheral wall thereof. A pair of flat-faced solid scraper rims formed by closed pleats rolled from the peripheral wall extend outwardly of the ring. The ring is made by rolling flat strip steel stock through a series of profiled rollers. Pleats are formed in the central portion by the profiled rollers and the pleats are closed on themselves to provide the solid scraper rims. The finished strip is then punched to provide the vent openings in the peripheral wall, and coiled and cut to form individual piston rings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.