Continental Teves, Ag and Company Ohg

Itt Manufacturing Enterprises, Inc.

Horst Kr&auml;mer

Peter Drott

Hans-J&ouml;rg Feigel

Jan Hoffmann

Michael Vogt

Jose Gonzales

Holger Kranlich

Thorsten Neu

Karlheinz Haupt

Uwe Kley

Hans J&ouml;rg Feigel

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.

Operating unit for an electrohydraulic braking system

Actuation device for an electrohydraulic braking system

The present invention relates to a brake force booster for automotive vehicles which includes a booster housing whose interior space is subdivided by a movable wall into a working chamber and a vacuum chamber, and a control housing which carries the movable wall and in which a control valve is arranged for controlling a pressure differential that acts upon the movable wall, the said control valve being operable by an operating rod by way of a valve piston and by an electromagnet. According to the present invention, the brake force booster is characterized in that the electromagnet is actuatable in dependence on the relative displacement between the valve piston and the control housing detected by a sensor. This arrangement makes possible a very simple control of a brake assist function because the signal of the sensor can be used both for the activation and the deactivation of the electromagnet. This means that the brake assist function can be triggered and/or terminated only on the basis of the signals of one single sensor.

Brake power booster and a method for controlling the same

The present invention relates to a brake force booster for automotive vehicles with a booster housing having its interior space subdivided by a movable wall into a vacuum chamber and a working chamber, and with a control valve which controls a pressure differential that acts upon the movable wall and is accommodated in a control housing that carries the movable wall, the said control valve being comprised of at least two concentrically arranged sealing seats and a valve member which defines in the control housing a pneumatic chamber that can be acted upon by the pneumatic pressure that prevails in the working chamber wherein the valve member includes at least two sealing lips of different diameters which define the pneumatic chamber in the control housing, and that the effective pneumatic surface of the chamber which is influenced by the difference in diameters is generally in conformity with the pneumatic surface defined between the two sealing seats.

Power assisted brake for motor vehicles

A braking pressure boosting device is suggested, in particular for automotive vehicles, which includes a boost sensor for sensing or identifying the point of maximum boosting of the braking pressure boosting device. By using the boost sensor, ad signal is generated reporting the point of maximum boosting. This invention permits the manufacture of high-performance braking force boosting devices requiring minimal space and opens up new potential for economizing.

Braking force boosting device, in particular for automotive vehicles

A brake power booster for automotive vehicles includes a control valve that is operable by an electromagnet irrespective of an actuating rod displacing a valve piston, the electromagnet actuating a third sealing seat which permits ventilation of the working chamber. The valve member of the control valve has passages which allow a pneumatic pressure compensation. To eliminate a pneumatic force component which counteracts the force generated by the electromagnet, the passages are provided radially outside the area delimited by the electromagnetically operable sealing seat on the sealing surface of the valve member.

Growing community of inventors

Ginsheim-Gustavsburg, Germany

Horst Krämer

Growing community of inventors

Ginsheim-Gustavsburg, Germany

Horst Kr&auml;mer

Horst Krämer