Claims
- 1. Hydraulic brake system with brake slip control and traction slip control, said system of the type including a master brake cylinder which is connected to a pressure fluid reservoir, at least one wheel brake cylinder associated with a driven wheel, a brake line from the master brake cylinder to the wheel brake cylinder, an inlet valve in the brake line, a low-pressure accumulator, a return line from the wheel brake cylinder to the low-pressure accumulator, an outlet valve in the return line, a self-priming pump, a pressure chamber in a housing, a cut-off valve in the brake line between the master brake cylinder and the inlet valve, a pressure line from the pressure chamber to the brake line between the cut-off valve and the inlet valve, a pressure valve between the pressure chamber and the pressure line, a first suction line between the low-accumulator and the pressure chamber, a second suction line between the pressure fluid reservoir and the pressure chamber, a change-over valve in the second suction line, comprising:
- a first suction valve between the low-pressure accumulator and the pressure chamber, a second suction valve between the change-over valve and the pressure chamber, wherein said first and second suction valves are arranged in the pump housing.
- 2. Hydraulic brake system as claimed in claim 1, wherein at least one of the suction valves has a valve seat on the housing, and the other suction valve has its valve seat on a movable piston.
- 3. Hydraulic brake system as claimed in claim 1, wherein the pressure chamber is substantially cylindrical and is defined at each axial end by one of said first and second suction valves.
- 4. Hydraulic brake system as claimed in claim 1, wherein the closure member of the second suction valve is acted upon in the opening direction by the pressure in the second suction line on a larger surface than the closure member of the second suction valve is acted upon by the pressure in the first suction line.
- 5. Hydraulic brake system as claimed in claim 1, wherein further including a valve spring is interposed between the closure members of the two suction valves for acting upon both closure members in the direction so as to close.
- 6. Hydraulic brake system as claimed in claim 5, wherein the closure member of the second suction valve is acted upon by a compression spring which counteracts the valve spring and is weaker than the valve spring.
- 7. Hydraulic brake system as claimed in claim 1, wherein the closure members of both suction valves are balls.
Priority Claims (2)
Number |
Date |
Country |
Kind |
43 24 689.3 |
Jul 1993 |
DEX |
|
43 26 389.5 |
Aug 1993 |
DEX |
|
Parent Case Info
This application is the U.S. national-phase application of PCT International Appl Ser. No. PCT/EP94/02350.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/EP94/02350 |
7/16/1994 |
|
|
4/15/1996 |
4/15/1996 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO95/03198 |
2/2/1995 |
|
|
US Referenced Citations (23)
Foreign Referenced Citations (15)
Number |
Date |
Country |
3218960 |
Nov 1983 |
DEX |
3326329 |
Feb 1984 |
DEX |
3439408 |
Jul 1986 |
DEX |
3742824 |
Jul 1989 |
DEX |
4009640 |
Jun 1991 |
DEX |
4027794 |
Mar 1992 |
DEX |
4031533 |
Apr 1992 |
DEX |
4133391 |
Apr 1993 |
DEX |
2305378 |
Dec 1990 |
JPX |
844817 |
Jul 1981 |
SUX |
8101176 |
Apr 1981 |
WOX |
WO8809278 |
Dec 1988 |
WOX |
WO9205990 |
Apr 1992 |
WOX |
WO9209464 |
Jun 1992 |
WOX |
WO9308053 |
Apr 1993 |
WOX |
Non-Patent Literature Citations (3)
Entry |
Patent Abstracts of Japan, vol. 15, No. 89 (M-1088) Mar. 4, 1991. |
Search Report of the German Patent Office for Appln No. P4324689.3. |
English Translation of International Preliminary Examination Report for Appln PCT/EP/94/02350. |