Hydraulic vehicle braking system

US6186602A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolf-Dieter Jonner · Freising, DE
• Ortwin Engfer · Stuttgart, DE
• Anton Van Zanten · Ditzingen, DE
• Jürgen Binder · Lahr (Eifel), DE
• Martin Pfau · Rutesheim, DE
• Eberhardt Schunck · Landau, DE
• Andreas Kaessmann · Gerlingen, DE
• Juergen Hachtel
• Ulrich Gottwick · Stuttgart, DE
• Michael Schubert · Coburg, DE

Key dates

• Filing date: Dec 4, 1998
• Grant date: Feb 13, 2001
• Expiry date: Dec 4, 2018

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T13/168
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A hydraulic vehicle brake system in which normal service brake operation can be carried out by using external hydraulic energy, and in the event of a lack of external hydraulic energy, auxiliary brake operation by muscle power is possible, with a hydraulic transmission that comes from a master cylinder that can be actuated by means of the brake pedal. The external hydraulic energy is stored, for example, in an accumulator with a gas buffer, which can lead to a gas content in the hydraulic fluid for the service brake operation. The system includes a dual-circuit master cylinder associated with those wheel brakes of a vehicle axle that make a higher contribution to the vehicle deceleration and at the same time, cylinder/piston devices are installed between these wheel brakes and their associated service brake valves for the purpose of preventing hydraulic fluid from getting into these wheel brakes from the external energy source. The advantage is that neither gas nor air is carried into the wheel brakes where it could lead to the formation of bubbles in the event of a pressure drop and would be disadvantageous for an auxiliary brake operation by the master cylinder. The cylinder/pist…