Hydraulic brake system for motor vehicles

US5167442A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Norbert Alaze · Markgröningen, DE
• Friedrich Megerle · Cologne, DE
• Werner Wilde · Schwieberdingen, DE
• Guenter Kaes · Stuttgart, DE

Key dates

• Filing date: Nov 6, 1991
• Grant date: Dec 1, 1992
• Expiry date: Nov 6, 2011

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S303/901
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A structurally simplified brake system which increases its functional reliability. The brake system has a brake pressure line extending between a master brake cylinder and a wheel brake. A shutoff valve is connected in parallel with a pressure limiting valve disposed in the brake line. A high-pressure pump toward the wheel brake side is capable of feeding pressure fluid into the line when the shutoff valve is closed. If a response pressure of the pressure limiting valve is exceeded, the pressure fluid can be diverted back to the master cylinder. The shutoff valve has a valve seat toward the wheel brake and a closing member toward the master cylinder which closing member is capable, by the action of a magnetic force on an armature of engaging the valve seat. A compression spring is disposed between the armature and the closing member and in the valve closing position exerts a closing force, adapted to the response pressure, upon the closing member. The shutoff valve and the pressure limiting valve are thus attained in a single valve unit.