Patent ID: 7591134
Filing Date: 2009-09-22
Classification: B60T

Abstract:
1. A vacuum booster ( 1 ) of a brake device ( 50 ) including: a master cylinder ( 10 ) having a piston ( 13 a ) slidably fitted in a cylinder ( 12 a ) having a port ( 48 a ) communicating with a reservoir ( 46 ), so that the port ( 48 a ) is closed by forward movement of the piston ( 13 a ) to transmit liquid pressure from the cylinder ( 12 a ); the vacuum booster ( 1 ) to boost a force for operating a brake to push and move the piston ( 13 a ); a wheel cylinder ( 51 ) supplied with the liquid pressure from the master cylinder ( 10 ) to operate a braking unit ( 52 ) of each of the wheels ( 54 ); and an liquid pressure generating unit ( 53 ) to pump and supply brake liquid stored in the reservoir ( 46 ) to the wheel cylinder ( 51 ) through the port ( 48 a ) by using a pump ( 63 a ), wherein the vacuum booster comprising: a booster shell ( a partition member ( a valve piston ( an input member ( a valve mechanism ( an output member ( reaction applying means ( stop position shifting means (