Hydraulic braking system for road vehicles, in particular passenger cars

US5988768A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Ernst-Dieter Schaefer · Neckartenzlingen, DE
• Eberhardt Schunck · Landau, DE
• Andreas Kaessmann · Gerlingen, DE

Key dates

• Filing date: Jun 15, 1998
• Grant date: Nov 23, 1999
• Expiry date: Jun 15, 2018

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T13/686
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A brake system that includes a power-actuated service brake and an auxiliary brake that is actuated by muscle power. To achieve a desired characteristic curve of the pedal when the service brake is actuated, a path simulator is provided in a master cylinder. This path simulator has compression springs disposed in a pressure chamber. The pressure chamber is defined by a floating piston with a seat valve, which controls a pressure fluid-carrying connection of the pressure chamber to a pressure fluid reservoir of the master cylinder. The function of the seat valve is dependent on the stroke of a rod piston, which can displace pressure fluid from a first pressure chamber when the auxiliary brake is actuated. The path simulator is active if pressure fluid is not displaced from the first pressure chamber during the actuation of the service brake and therefore the seat valve assumes its open position.