Patent ID: 8616348

Claim:
A combined vehicle brake, which comprises: a hydraulically actuated service brake and an electromechanically actuated parking brake device, a hydraulic operating pressure chamber in a brake housing defined by a brake piston, which for performing service braking actions is configured to be acted upon by hydraulic pressure fluid to actuate the brake piston along a piston longitudinal axis in order to produce a braking action, the parking brake device acting on the brake piston by means of a transmission, wherein the transmission translates a rotary motion of an electromechanical actuator into a translational motion and actuates the brake piston in order to perform parking brake actions and to keep the brake piston in an actuated position, the transmission comprising a screw spindle and a spindle nut, which are in contact with one another by way of multiple rolling elements, wherein the rolling elements are arranged to move between two stops in a thread of the spindle nut, and a spring element arranged between the rolling elements and one of the stops, said spring element allowing the rolling elements to slide in no-load actuation of the transmission and allowing the rolling elements to roll when the transmission is actuated under load, wherein the stops comprise two helical segment-shaped locking elements, the diameter of each helical segment-shaped locking element before pressing being greater than the diameter of the thread of the spindle nut and which after pressing are frictionally positioned in the spindle nut due to an elastic deformation.