Rotary servovalve
US4460016A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 1982 |
| Grant date | Jul 17, 1984 |
| Priority date | — |
| Expiry date | Mar 19, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86662
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A rotary servovalve for a power steering system is provided wherein a plurality of orifices are established by a plurality of axial extending lands formed on the internal surface of a valve sleeve and the circumferential surface of a rotor received therein. As the rotor rotates relative to the sleeves, the orifices control the pressure and the flow of fluid supplied from a pump to a power cylinder of the steering system and from the power cylinder to a reservoir. Each of the lands on the rotor is formed at each of its circumferential edges with a chamfer which has a third slope for preventing the generation of cavitation and hissing noise, in addition to first and second slopes for offering an optimum steering feeling to a vehicular driver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.