Main cylinder arrangement, for vehicle brake unit, has main cylinder with first chamber connected to suction side of pump and to hydraulic reservoir, which is connected to pump by second suction path

摘要

The arrangement (10) has a main cylinder (12) with a first chamber (14), which is acted on by a first piston (38). A hydraulic fluid reservoir (70) is connected to the first chamber by a line (104,106,108,128), in which a first valve (132) is arranged, which is open if the piston is in its rest position. A pump (148) is connected to the first chamber on its suction side. The line forms a first suction path for the pump, while a parallel suction line forms a second suction path for the pump, which connects the reservoir to the suction side of the pump. A second valve (134) is arranged in the second suction line, which is open if the pump draws hydraulic fluid from the reservoir.