Patent ID: 6343469
Filing Date: 2002-02-05
Classification: B60T

Abstract:
In a hydraulic system having a pump for sequentially supplying a brake booster with supply hydraulic fluid to assist in effecting a brake application and supplying a steering system with supply hydraulic fluid to assist in a steering application, said brake booster having a housing with a control chamber connected to a first bore with a piston therein and a second bore with a control valve therein, said piston being connected to a master cylinder, said second bore having an inlet port connected to said pump for receiving supply hydraulic fluid, an outlet port connected to the steering gear and a return port connected to a reservoir of said pump, linkage means responsive to an input member for moving said control valve to initially terminate communication between said second bore and said reservoir by way of said return port and thereafter restricting the flow of said supply hydraulic fluid presented to said inlet port by flowing a first portion to said control chamber while directing the flow of a second portion of said supply hydraulic fluid to said steering gear, said first portion of said supply hydraulic fluid acting said piston to provide a master cylinder with an operational force to produce a brake application in wheels of a vehicle, said hydraulic system being characterized by regulator means connected to said pump for receiving and directing the flow of said supply hydraulic fluid to said inlet port of said housing of said booster, said regulator means responding to a preset hydraulic fluid pressure in said first portion of said supply hydraulic fluid presented to said chamber by metering the flow of said supply hydraulic fluid to said inlet port of said brake booster and thereafter directly communicating a corresponding portion of said supply hydraulic fluid to said steering gear, said regulator means on metering the flow of said supply hydraulic fluid to said inlet port establishing a maximum limit for the hydraulic pressure in said first portion of said supply hydraulic fluid as presented to said control chamber.