Piston and piston ring assemblies
US4669369A · kind A · utility
28Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1985 |
| Grant date | Jun 2, 1987 |
| Priority date | — |
| Expiry date | Jan 14, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05C2253/16
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A two ring piston and piston ring assembly has an upper thin steel compression ring and a lower ring which is thicker than the compression ring and which acts both as a compression ring and an oil control ring. The lower piston ring is made of a material which is more conformable than steel, for example a plastics material, which may be reinforced. In this way, effective sealing is provided using only two piston rings, while the frictional forces between the piston and an associated cylinder are reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.