Patent ID: 8196505
Filing Date: 2012-06-12
Classification: B60T

Abstract:
1. A brake booster comprising: a casing divided into a constant pressure chamber and a variable pressure chamber by a diaphragm, the casing having a through-hole in one side thereof; a power piston attached to the diaphragm; a disc-shaped stem coupled to a center of the power piston and having a through-hole; a plunger interposed between the stem and an input shaft connected to a brake pedal, the plunger pressing or releasing the stem by means of reciprocation of the input shaft; and an air intake valve having a vacuum passage through which the constant pressure chamber communicates with the variable pressure chamber, wherein the air intake valve is inserted into the diaphragm and the power piston so as to be in close contact with the casing through-hole, and wherein the air intake valve regulates air flowing from an atmosphere into the variable pressure chamber and air flowing from the variable pressure chamber into the constant pressure chamber by reciprocation of the input shaft.