Hydraulic braking system for automobiles

US6446435B1 · kind B1 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Karl-Heinz Willmann · Glückstadt, DE
• Dietmar Baumann · Hemmingen, DE
• Hardy Haas · Ditzingen, DE
• Stephane Schmit · Moyeuvre-Grande, FR
• Herbert Vollert · Lambach, DE
• Andreas Reppich · Leonberg, DE

Key dates

• Filing date: Apr 10, 2000
• Grant date: Sep 10, 2002
• Expiry date: Apr 10, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B11/005
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a vehicle hydraulic brake system with electrohydraulic brake boosting by a piston pump. In order to reduce pressure pulsations on an intake side of the multi-piston pump, the brake system embodies a multi-piston pump, for example, as a six-piston pump with stepped pistons that are driven with an alternating phase shift of 30° and 90° in relation to one another. The phase shift of the drive of the stepped pistons is selected so that the intake volume flows have a uniform phase shift, by which the total intake volume flow of the multi-piston pump has a reduced amplitude of the pressure pulsation, which reduces the repercussions on a master cylinder.