Non-metallic piston rings with controlled expansion pressure
US4629200A · kind A · utility
28Cited by
0References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 6, 1984 |
| Grant date | Dec 16, 1986 |
| Priority date | — |
| Expiry date | Aug 6, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S277/946
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A piston ring formed from a plastics material and having a maximum pressure against the associated cylinder of between 0.10 and 1.50 MN/m.sup.2 and preferably 0.50 MN/m.sup.2. One possible material for such piston rings is polyetheretherketone. The benefits obtained are greater conformability which leads to a reduction in the number of piston rings which need be used for a particular piston. This in turn reduces friction so increasing the performance of the associated engine. Acceptable wear rates and ability to withstand operating temperatures have been found in these piston rings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.