COMBINED VEHICLE BRAKE

摘要

A combined vehicle brake having a hydraulically actuable driving brake and an electromechanically actuable parking brake device. In a brake housing, a hydraulic operating pressure space is bounded by a brake piston chargeable with hydraulic pressure medium to carry out normal braking. The brake piston is actuable along a longitudinal axis of the piston, and the parking brake device acts on the brake piston by a gearing converting the rotational movement of an electromechanical actuator into a translation movement and bringing about an actuation of the brake piston in order to carry out parking brake operations and keeping the brake piston in the actuated position. The gearing has a threaded spindle and a threaded nut which are in contact with each other via a plurality of rolling bodies. The frictional moment transmitted by the further axial bearing is higher than the returning torque of the threaded spindle.

主权项

1. A combined vehicle brake which has a hydraulically actuable service brake and an electromechanically actuable parking brake apparatus, a hydraulic service pressure space being delimited in a brake housing by a brake piston which can be loaded with hydraulic pressure medium in order to carry out service brake operations, with the result that the brake piston can be actuated along a piston longitudinal axis in order to achieve a braking action, and the parking brake apparatus acting on the brake piston (6) by a rotational/translational gear mechanism which is driven by an electromechanical actuator and brings about an actuation of the brake piston in order to carry out parking brake operations and stops in the actuated position, the rotational/translational gear mechanism having a threaded spindle and a threaded nut which are in contact with one another via a plurality of rolling bodies, and with an axial bearing, on which the threaded spindle is supported, wherein a further axial bearing is connected in series with the axial bearing, which further axial bearing acts only during the release operation of the parking brake apparatus and is designed in such a way that the frictional moment which is transmitted by the further axial bearing is higher than the retrodriving moment of the threaded spindle which is generated by the rotational/translational gear mechanism.