Patent ID: 6895853
Filing Date: 2005-05-24
Classification: B60T

Abstract:
1. In a tandem brake booster having a housing formed by a front shell that is joined to a rear shell to create an interior cavity that is divided by a first diaphragm assembly and a second diaphragm assembly and thereby isolate a first chamber from a second chamber and a third chamber from a fourth chamber, said first and second diaphragm assemblies being separated from each other by a partition member, said first and third chambers being connected to constantly receive a fluid having a first pressure while said second and fourth chambers are selectively connected to receive either the fluid having the first pressure or fluid having a second pressure as a function of the operation of valve means, said valve controls the communication of fluid at said second pressures to said second and fourth chambers to create a pressure differential across said first and second diaphragm assemblies with the first fluid in the first and third chambers to develop an output force and thereby effect a brake application, said partition member being characterized by a disc with a cylindrical body extending from a ledge formed on a peripheral surface of the disc and a flange located on said cylindrical body between said ledge and an end face of the cylindrical body, said flange being formed with alternate radial sections and ramped sections, said radial sections engaging said rear shell to locate said partition member within said interior cavity while said ramped sections define a first portion of a flow path for communication of fluid between said second and fourth chambers.