BRAKE BOOSTER FOR A VEHICLE, CAPABLE OF PREVENTING THE NOISE OR TAPPING SOUND IN THE OPERATION OF A BREAK BOOSTER

摘要

PURPOSE: A brake booster for a vehicle is provided to reduce the noise or tapping sound in the contacting between a key and a rear cell by firstly contacting the key to a rear sealing member when a plunger goes backs.;CONSTITUTION: A brake booster for a vehicle comprises a casing, a diaphragm, a power piston, a valve body(30), a key(40) and a sealing member. A front cell and rear cell are combined to seal the casing. The diaphragm divides the inside of the casing into a constant pressure room and a variable pressure room. The power generated due to the pressure difference of the variable pressure room and constant pressure room is transmitted to the power piston. The valve body passes through the central part of the diaphragm by sliding. The valve body is projected to outside through the open central part of the rear cell. The plunger is installed in one end of the valve body in inside to move back and forth. The plunger controls the air injection to the variable pressure room. The key is installed in one side of the valve body. The key limits the reciprocating motion range of the plunger. The sealing member is arranged in the outside of the valve body.;COPYRIGHT KIPO 2011