Vacuum brake assister for vehicles - has rubber elastic membrane with annular axial relief groove on symmetry axis of valve piston

摘要

A vacuum brake assistor for vehicles has an assistor housing with a rubber elastic membrane (13). This transfers the brake force to the activating piston of the main cylinder via a connecting rod. The membrane is contained in an axial bore hole, on one side of which lies the valve piston and on the other lies the connecting rod head flange. The surface (27) of the rubber elastic membrane facing the valve piston has an annular axial relief groove (31), the middle point of which lies on the axis of symmetry of the valve piston (10). ADVANTAGE - Improved functional security.