Hydraulic vehicle brake system with an anti-skid system

• US 5,403,076 A
• Filed: 01/05/1994
• Issued: 04/04/1995
• Est. Priority Date: 03/24/1993
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Meyer, Michael-Raymond, Binder, Juergen, Van Zanten, Anton, Altmann, Rainer, Lauer, Rainer
• Primary Examiner(s): Oberleitner, Robert J.
• Assistant Examiner(s): Young, Lee W.
• Application Number:
  US08/177,484
• Time in Patent Office: 454 Days
• Field of Search: 303/100, 303/111, 303/3, 303/10, 303/15, 303/20, 364/426.02
• US Class Current: 303/125
• CPC Class Codes: B60T 8/4881 having priming means
• CPC Class Codes: B60T 8/489 using separate traction control modulators

Abstract

A hydraulic motor vehicle brake system with dual brake circuits having an anti-skid system and is also further developed to improve vehicle tracking by ways of automatic braking, especially during cornering. During automatic braking, an auxiliary pressure source delivers a pressure medium to an anti-skid system to supply the wheel brakes. For this purpose a separating piston for each brake circuit is located between the auxiliary pressure source and the anti-skid system. For the purpose of keeping costs low, the two separating pistons are accommodated in an integral cylinder with a blind bore.

Claims

1. A hydraulic vehicle brake system having a dual-circuit main brake cylinder, a reservoir for the main brake cylinder, first and second brake circuits for wheel brakes of a motor vehicle, an anti-skid system associated with the wheel brakes that has brake pressure modulation valve arrangements and a recirculating pump (13, 14) for each brake circuit, an automatic braking system in cooperation with the anti-skid system, at least one 2/2-way valve (324, 328, 357) for each brake circuit between said dual circuit main brake cylinder, the reservoir and the anti-skid system, said at least one 2/2-way valve for each brake circuit is connected with said brake cylinder and reservoir and, connected to the anti-skid system, an integral cylinder (301):

a uniform diameter cylinder bore in said integral cylinder a separating piston displaceably disposed in said cylinder bore for each brake circuit, said separating pistons separate a secondary chamber from a primary chamber in said cylinder bore, said integral cylinder includes a separating piston restoring spring for each piston, and said automatic braking system includes a common auxiliary pump (49) for both brake circuits, wherein during automatic brake operation the auxiliary pump supplies pressure to displace the separating pistons and close the 2/2-way valves (324, 328,

     357), and a control device for controlling the anti-skid system to avoid a danger of wheel locking, and the automatic braking system for automatic braking, the cylinder bores of the two separating pistons (314, 315;

345,

     346) are oriented on the same axis, and embodied as a blind bore (303;

     344) and accommodated in a common integral cylinder (301;

     341);

that an end opening (304;

     344), of the blind bore (302;

     342) is sealed with a lid (305);

that both separating pistons (314, 315;

345,

     346) are disposed oriented toward each other with their primary-side ends (316;

349,

     350) between separating piston restoring springs (317,

     318); and

that an auxiliary pressure connection (313) is disposed in the integral cylinder (301;

     341), which discharges between the separating pistons, and is supplied from said auxiliary pump (49).

2. The hydraulic vehicle brake system of claim 1 in which the separating pistons (314, 315;

345,

     346) are embodied in a manner of pistons and are disposed between two brake circuits (I, II) for their hydraulic separation.