| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative pressure type booster device improved in mount ing work efficiency. SOLUTION: This negative pressure type booster device 1 is provided with a housing 2, a movable wall 3, a power piston 6, an input member 8, a valve mechanism 9, an output rod 11, an auxiliary movable wall 15 and a diaphragm 16 forming an auxiliary pressure changing chamber 17 between the auxiliary movable wall and itself. In this case, the device is provided with a communicating passage 81 for making a rear chamber 5 communicate with the auxiliary pressure changing chamber 17, and a solenoid valve 20 capable of cutting off the communication of the rear chamber 5 with the auxiliary chamber 17 through the communicating passage 81. |
