Motor vehicle brake system comprising a parking brake function and electromechanical wheel brake for such a motor vehicle brake system

Abstract

The present invention relates to a motor vehicle brake system, having at least one first and at least one second electromechanical wheel brake (10), which each comprise an electric actuator for generating an actuating force and a self-boosting device for automatically boosting the actuating force generated by the actuator in order to press a friction element against a rotatable component (14) of the wheel brake (10) that is to be braked, wherein each self-boosting device comprises a wedge (18), which is supported against an associated abutment (22) and has at least one wedge face (20, 20′) disposed at an angle of slope (α). In order to realize a parking brake function, the self-boosting device of the first wheel brake comprises at least one wedge face (20), which is used to boost the force in brake operations during forward travel, and the self-boosting device of the second wheel brake comprises at least one wedge face (20′), which is used to boost the force in braking operations during reverse travel. In many embodiments, the angle of slope (α) of the said wedge faces (20, 20′) is so selected that the wheel brakes (10) in any case with normally prevailing coefficients of friction μ are self-locking. In the parking brake function the friction element of the first wheel brake, by utilizing the wedge face (20) used to boost the force in braking operations during forward travel, and the friction element of the second wheel brake, by utilizing the wedge face (20′) used to boost the force in braking operations during reverse travel, are clamped against the component of the wheel brake (10) that is to be braked. The invention also relates to an electromechanical brake for such a motor vehicle brake system.

Dependencies are inferred from the claim text.