Hydraulische Fahrzeugbremse mit Feststelleinrichtung und Verfahren zum Betreiben derselben

摘要

A hydraulic vehicle brake (10) has a hydraulic chamber (16) in which a brake piston (18) can slide in a sealing manner along an axis (A). The brake piston (18) acts upon a friction member and can be pushed by hydraulic pressure fed into the hydraulic chamber (16) into an actuation position in which it presses the friction member against a rotor (brake disk, brake drum, etc.). To enable the brake (10) to be used also as a parking brake, besides its function as a hydraulic service brake, a spindle/nut arrangement (24) driven by an electric motor (42) and extending coaxially to the axis (A) of the brake piston (18) is provided. The nut (30) of the spindle/nut arrangement (24) is secured against rotation and by rotating the spindle (26) can be moved along the axis (A) either up to or away from the brake piston (18), depending on the direction of rotation. In order to obtain a compact and economic design, the output shaft (46) of the electric motor (42) extends from the side of the electric motor (42) away from the brake piston (18) in a parallel direction to the axis (A), from which it is laterally spaced apart. Moreover, a reducing gear (44) with a reducing ratio in the order of 200:1 is connected between the electric motor (42) and the spindle (26), the electric motor (42) and the reducing gear (44) being designed as subassemblies (40) that can be handled separately.