Hydraulic system for motor vehicle
US5802848A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 1997 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Aug 28, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01P7/044
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A motor vehicle hydraulic system including a power steering pump, a reservoir, a steering assist fluid motor, and a second fluid motor for a radiator cooling fan. A flow control valve remote from the power steering pump divides the total fluid flow from the power steering pump into a high flow branch and a low flow branch. Fluid circulates in the low flow branch at a substantially constant flow rate for a proportional control valve for the steering assist fluid motor and returns to the reservoir through an unrestricted tubular boss on the reservoir. Fluid in the high flow branch issues as a jet stream from a nozzle on the reservoir into a venturi passage submerged in fluid in the reservoir. The venturi passage is connected to an inlet port of the power steering pump. The jet stream aspirates fluid from the reservoir into the venturi passage. The kinetic energy of the jet stream is converted into superatmospheric pressure at the inlet port of the power steering pump to suppress cavitation. Fluid from the low flow branch dwells in the reservoir for a time duration adequate for natural release therefrom of any entrained gas bubbles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.