Combination formula vehicle brake with ball screw transmission mechanism

The utility model relates to the box -like vehicle brake of a species group with but hydraulic actuating's service brake ware and the parking braking device that can electromechanically operate. The utility model discloses a technical problem that will solve lies in, improves the known application of ball screw transmission mechanism in vehicle brake, realizes simple automatic installation to and mind cycle time. Suggestd to the solution: provide spring element (10) the bifilar helix type, design the difference according to portion's section through following mode: in intermediate part section (22), set up an unit promptly in the transmission thread groove, the unit does not hinder the matching of the transmission thread groove that the mode of spring element (10) submitting to with elasticity and spiral coiled basically, is provided with on at least one tip of these external spring element (10) support section (24), the support section is compared with intermediate part section (22) to be had great transvers