Hydraulic pressure control valve
US5645107A · kind A · utility
7Cited by
1References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1995 |
| Grant date | Jul 8, 1997 |
| Priority date | — |
| Expiry date | Nov 17, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86662
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A hydraulic pressure control valve includes a cylindrical valve body and a valve spool coaxially fitted therein, each having oil grooves and lands alternately provided on and along the respective peripheral inside and outside surfaces, the opposing oil grooves and lands having throttles therebetween whose throttling extent, are changeable in accordance with a relative angular displacement between the valve body and the valve spool such that the flow of a working oil is concentrated in wider throttles. Thus noise due to cavitation is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.