HYDRAULIC PRESSURE-OPERATED STYLE SHIELDING VALVE AND HYDRAULIC PRESSURE TYPE VEHICLE BRAKING DEVICE

摘要

The invention relates to a hydraulically actuated stop valve (10) serving as a suction valve positioned between a master brake cylinder and the suction side of a supply pump of an antiskid braking system for motor vehicles. According to the invention, the stop valve (10) is provided with a closing element (20) having a valve lifter (24). Said closing element passes through a ring-shaped actuating element (26) and engages with a rocking element (34) configured as a spring washer which rests on a ring-shaped swivel bearing (40). When pressure is applied to the actuating element (26) it presses down an outer edge of the rocking element. As a result, one half of the actuating element (26) carries out a turning movement in the opposite direction, which movement closes the stop valve (10). The advantages of this stop valve (10) are that it is cost-effective, consists of only a limited number of components and can be used in a hydraulic brake system for motor vehicles. The invention also relates to a hydraulic brake system for motor vehicles comprising a master brake cylinder (48), wheel brake cylinders (54) supplied with brake pressure by said master brake cylinder (48), pressure build-up and pressure cut-back valve systems (60, 62) assigned to said wheel brake cylinders, one self-priming supply pump (66) for each braking circuit, a suction valve (74) positioned between the master brake cylinder and an inlet (64) of the supply pump (66) which is connected to the pressure build-up and pressure cut-back valve systems (60, 62), and a reversing valve (56) positioned between an outlet of the supply pump (66) and the master brake cylinder (48). This hydraulic brake system for motor vehicles is characterized in that a second suction valve (44, 44a) is mounted parallel to the suction valve (74) and allows for better filling of the supply pump (66).