| 摘要 |
A brake booster device for use in a brake system of vehicles is provided with a partition member dividing the interior of the booster shell into front and rear chambers and a piston movable bodily with the partition member within the booster shell. A control valve body is carried on the piston to move toward and away from the rear surface of the piston through a predetermined amount. An air valve member is received within the piston for relative movement thereto and is urged by a compression spring to be moved rearwardly. When the brake pedal is stepped on, the air valve member is forwardly moved by an input rod relative to the piston, whereby the control valve member leads the atmospheric pressure to the rear chamber thereby to move the partition member and the piston forwardly from a home position. When the brake pedal is released, on the contrary, the control valve leads a negative pressure from the front chamber to the rear chamber thereby to permit the partition member and the piston to move rearwardly to the home position by the force of a return spring. The movement of the piston operates a master cylinder through an output rod to generate braking power.
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