Power steering system
US5253729A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 1991 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Nov 20, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86654
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A steering system rotary valve having relatively rotatable spool and sleeve members and including first and second valve groups for controlling the amount of fluid feed to a power cylinder responsive to spool/sleeve rotation and including third and fourth valve groups for controlling feed pressure of fluid discharged from a pump, is provided with blocks arranged between the first and second valve groups and between the third and fourth valve groups to interrupt communication between these groups and also is provided with a variable throttle valve on the downstream side of the third and fourth valve groups so that pressure acting on all the valve groups is substantially equalized to provide uniform pressure on the entire circumference of the spool and the sleeve thereby preventing these members from becoming pressure deformed during the course of rotary valve operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.