Vehicle suspension system
US4978135A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 1989 |
| Grant date | Dec 18, 1990 |
| Priority date | — |
| Expiry date | Sep 6, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60G2800/014
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vehicle suspension system includes a liquid piston-cylinder device connected between the vehicle body and a wheel. A liquid pump is provided in a liquid passage which connects the liquid piston-cylinder device to a reservoir in which hydraulic liquid is reserved, and feeds under pressure the hydraulic liquid in the reservoir through the liquid passage. A control valve controls the flow of the hydraulic liquid through the liquid passage, thereby controlling feed and discharge of the hydraulic liquid to and from the liquid piston-cylinder device in order to control the properties of the suspension. An accumulator is connected to the liquid passage between the liquid pump and the control valve and accumulates the hydraulic liquid under pressure. A return passage connects the reservoir to the liquid passage between the liquid pump and the control valve and is provided with an on-off valve which opens and closes the return passage. The on-off valve closes the return passage when the ignition switch is turned off.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.