Vehicle hydraulic brake system

US5927824A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Arnold Pahl · Markgröningen, DE
• Wolf-Dieter Jonner · Freising, DE
• Norbert Alaze · Markgröningen, DE
• Helmut Pueschel · Erbach, DE
• Thomas Isella · Markgröningen, DE
• Guenther Schmidt · Tauberbischofsheim, DE
• Karl-Heinz Willmann · Glückstadt, DE
• Rolf Hummel · Steinenbronn, DE
• Elmar Mueller · Ehningen, DE
• Johann Herr · Leinfelden, DE
• Roland Holzmann · Heubach, DE
• Guenter Dzierzawa · Amberg, DE
• Martin Moehle · Steinheim, DE
• Guenter Krenz · Steinheim, DE
• Erika Mank · Ludwigsburg, DE
• Hans-Juergen Herderich · Weingarten, DE

Key dates

• Filing date: Sep 29, 1997
• Grant date: Jul 27, 1999
• Expiry date: Sep 29, 2017

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T11/232
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A vehicle hydraulic brake system having brake pressure modulation valve assemblies, between a dual-circuit master cylinder and wheel brakes of vehicle wheels. The pump device is embodied as a low-pressure pump with the brake pressure modulation valve assemblies be assigned a first and second return pump and that in the automatic braking mode the first pressure chamber is made to communicate with a first return pump and the second pressure chamber is made to communicate with the second return pump, on the inlet side in both cases. The low-pressure pump, in the automatic braking mode, generates charge pressure for the return pumps that is substantially below a maximum brake pressure, and the return pumps generate the maximum projected brake pressure and serve, in the additionally possible anti-lock mode, to return pressure fluid from the wheel brakes to the master cylinder. The vehicle brake system is an inexpensive low-pressure pump that offers a high possible capacity of the return pumps in the automatic braking mode.