Two pump power steering system
US5257670A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1991 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Sep 27, 2011 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62D5/32
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An apparatus provides hydraulic fluid for power steering assistance for steering a vehicle. A valve controls flow of hydraulic fluid from a first, engine driven, pump and a second, wheel driven, pump. The valve includes a valve housing and a valve member. The valve member is movable relative to the valve housing in response to a pressure differential in the hydraulic fluid from the first pump. The valve member in one range of relative positions provides a first flow passage from the first pump toward a steering valve, provides a variable second flow passage from the first pump toward the steering valve, and blocks hydraulic fluid flow from the second pump toward the steering valve. The first and second flow passages are in fluid parallel. The valve member in a control position provide a third flow passage from the second pump to the steering valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.