Operating unit for an electrohydraulic braking system

US6808238B2 · kind B2 · utility

Assignee

• Continental Teves AG & Co. OHG · DE

Inventors

• Peter Drott · Frankfurt am Main, DE
• Horst Krämer · Ginsheim-Gustavsburg, DE
• Jan Hoffmann · Rosbach, DE
• Holger Kranlich · Karben, DE

Key dates

• Filing date: Sep 27, 2002
• Grant date: Oct 26, 2004
• Expiry date: Sep 27, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T11/20
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

The present invention relates to an operating unit for an electrohydraulic braking system of the ‘brake-by-wire’ type, which is designed as a tandem master cylinder having a first and a second piston biased by each one resetting spring in opposition to the actuating direction. The first pressure chamber of the tandem master cylinder is connected to a hydraulic chamber defined by a simulator element. The simulator element also defines a simulator chamber accommodating a simulator spring and connected to a pressure fluid supply reservoir. A valve device is provided which closes or opens the hydraulic connection between the simulator chamber and the pressure fluid supply reservoir. To disclose an operating unit that permits being manufactured at low costs and allows easy bleeding, according to the present invention, the simulator element is formed of a hydraulic simulator piston and the valve device is provided by a seal arranged at the second piston and by the mouth area of a channel designed in the range of movement of the seal, the said channel forming the hydraulic connection.