Piston bearing structure for fluid pressure cylinder
US9388902B2 · kind B2 · utility
13Cited by
33References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 24, 2012 |
| Grant date | Jul 12, 2016 |
| Priority date | — |
| Expiry date | Feb 24, 2032 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B15/1452
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A piston bearing structure for a fluid pressure cylinder includes one seal ring which is housed in a housing groove of a piston and is held in sliding contact with a cylinder tube and two backup wear rings which is housed in a housing groove of a piston, is held in sliding contact with a cylinder tube and sandwiches the seal ring. The backup wear ring includes a pressure relief groove which faces the housing groove and extends over the backup ring portion and the wear ring portion, and the pressure relief groove allows opposite sides of the backup wear ring to communicate between the piston and the cylinder tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.