Master cylinder device with booster device

摘要

A master cylinder device with a brake booster device of an input rod pulling type is provided which is easy to assemble and in which the brake booster device and the master cylinder device therefor can be assembled independently of each other. The brake booster device is constructed so that a booster is partitioned by a diaphragm into a constant pressure chamber and a variable pressure chamber and that a piston secured to the diaphragm incorporates therein a valve mechanism for changing over the variable pressure chamber into communication with the constant pressure chamber or into communication with the atmosphere. The master cylinder device is constructed so that a master piston is inserted in a master cylinder formed in a cylinder body and that the pressurized brake fluid is delivered when a piston rod connected to the master piston is pulled toward the passenger room of the vehicle. The brake booster device is connected with the master cylinder device by bringing a front shell of the booster into abutting engagement with the rear end surface of the cylinder body, and the output rod of the brake booster device is connected by a joint means with the piston rod of the master cylinder device.