Claims
- 1. A pressure-regulating system for a hydraulic circuit, comprising at least one generator of fluid under pressure, a hydraulic motor and a reservoir of fluid under low pressure and including a solenoid valve controlled by a computer and comprising an electrical coil and a sliding magnetic core controlling a slide which slides in a bore provided in a body, said slide defining two chambers arranged on either side of the slide in said bore, said slide comprising a hydraulic cell determining a reaction force opposing the force generated by said coil, said cell being connected to one of said chambers as long as the solenoid valve is not energized, elastic means returning said slide and said core to a rest position, wherein said chambers are in connection with said source by means of a conduit when the solenoid valve is not energized, and a normally closed valve being located between one of said chambers and the reservoir so as to isolate the hydraulic circuit under pressure from the reservoir when the solenoid valve is not energized.
- 2. The pressure-regulating system according to claim 1, wherein said cell comprises a blind bore made in said slide, while a needle bearing on said body closes said cell substantially sealingly, and a radial duct putting the cell in communication with a groove provided on a periphery of said slide.
- 3. The pressure-regulating system according to claim 1, wherein said elastic means comprises a spring seated in one of said chambers.
- 4. The pressure-regulating system according to claim 1, wherein said elastic means comprises a set of springs of different stiffnesses arranged telescopically in one of said chambers.
- 5. The pressure-regulating system according to claim 1, wherein said normally closed valve is opened when the solenoid valve is energized and communicates said chambers with said reservoir.
Priority Claims (1)
Number |
Date |
Country |
Kind |
90 04701 |
Apr 1990 |
FRX |
|
Parent Case Info
This is a divisional of abandoned application Ser. No. 07/674,472 filed Mar. 25, 1991, abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (4)
Number |
Date |
Country |
227209 |
Jul 1987 |
EPX |
3119445 |
Feb 1982 |
DEX |
2503893 |
Apr 1982 |
FRX |
211409 |
Sep 1988 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
674472 |
Mar 1991 |
|