Hydraulic brake system for automotive vehicles

US4803840A · kind A · utility

Assignee

• Alfred Teves GmbH · DE

Inventors

• Wolfram Seibert · Darmstadt, DE
• Norbert Ocvirk · Offenbach, DE
• Guenter Trach · Offenbach, DE
• Otto Determann · Darmstadt, DE
• Horst Becker · Frankfurt am Main, DE

Key dates

• Filing date: Jan 23, 1987
• Grant date: Feb 14, 1989
• Expiry date: Jan 23, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S303/04
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A hydraulic brake system is described including a tandem master cylinder whose working chambers are connected by separate brake lines to pressure control valves of a brake slip control apparatus, having the wheel brakes connected downstream of the control valves. A pump unit including a pump communicates with the brake lines through pressure lines and non-return valves. Upon activation of the brake slip control apparatus, the drive of the pump is activated whereupon the pump feeds pressure fluid by way of the non-return valves into the brake line and the working chamber of the master cylinder. The fluid is under a pressure which is in excess of the maximum braking pressure attainable by actuation of the tandem master cylinder. For the purpose of pressure control, the tandem master cylinder includes central valves designed as control valves, by virtue of which the pressure in the working chambers is kept at the pressure level predetermined by an actuating force at the brake pedal.