Diaphragm type vacuum augmenter for automobile hydraulic braking

The utility model refers to a vehicle braking device, in detail is a diaphragm type vacuum booster used in vehicle hydraulic braking. It aims at the defect existed in the vacuum booster of existing vehicle brake system, which further causes the imperfection in vehicle braking performance. It includes front shell and rear shell. The rear shell has a control valve assembly in it with center of the control valve assembly has a push rod with return spring; a control valve piston is connected in front end of the push rod; a rubber reaction disc is provided in the leading end of the control valve piston; a diaphragm seat is installed in the rear shell; a brake master cylinder push rod with return spring on it passes through the front shell; the return spring installed on the brake master cylinder push rod is a diaphragm type spring. In the utility model, a butterfly diaphragm seat spring is used to replace a screw type cylindrical spring, which not only reduces the axial dimension, but also cuts the loss of pedal f