Patent ID: 7302796
Filing Date: 2007-12-04
Classification: B60T

Abstract:
1. An hydraulic brake booster for a automobile hydraulic system comprising a boost cylinder, a boost piston and a boost chamber, wherein the boost piston works in a bore in a body, the boost piston being adapted to apply an output force to an output rod in response to a pressure applied to the boost chamber by a control valve, wherein the control valve is in turn responsive to an input force from an input rod, the input rod being characterized in that movement of the input rod in a forward operating direction up to a prescribed point so as to prevent fluid from a radial high pressure supply port from entering the boost chamber at least when the booster is in an inoperative position, wherein the inoperative position comprises the supply port securely covered by a boost piston ball, such that any added movement of the input rod in a forward operating direction lowers the pressure in the boost chamber which enable the external pressure of the pressurized fluid to lift the boost piston ball and uncover the supply port so as to allow pressurized fluid into the boost chamber from an accumulator.