Mechanism of the servocontrol of the type having two pistons in tandem, which can be used in particular as a brake booster a depression in a hydropneumatic control of the brakes of a motor vehicle

摘要

P & this mechanism is composed essentially of two pistons 3, 4 arranged in tandem, in a housing or cylinder formed of two shells 1, 2, of two diaphragms 7 and 8 and a valve 5. It can be mounted between a brake pedal acting on the control rod 22 and a master - cylinder is actuated by the pusher 17, a vacuum supplied by the intake manifold or a vacuum pump being applied by the pipe 16. In order to reduce the axial dimension of the mechanism, the pistons 3 and 4 are made of pressed sheet metal and the protuberance 20 forming the recess 18 in the front shell 1 can fit into the cylindrical part 3b of the front piston 3 at the end of the advance of the pistons. / p