The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 05, 2002
Filed:
Sep. 25, 2000
William John Penninger, Niles, MI (US);
John Edmund Mackiewicz, Niles, MI (US);
Robert Bosch Corporation, Broadview, IL (US);
Abstract
A hydraulic system ( ) having a pump ( ) for sequentially supplying a brake booster ( ) and a steering gear ( ) with hydraulic fluid to an assist in effecting a brake application and/or a steering application. The brake booster ( ) has a housing ( ) with a chamber ( ) therein connected to a first bore ( ) which retains a piston ( ) connected to a master cylinder ( ) and a second bore ( ) which retains a control valve ( ). The second bore ( ) has an inlet port ( ) connected to the pump ( ) for receiving supply hydraulic fluid, an outlet port ( ) connected to the steering gear ( ) and a return port ( ) connected to the pump ( ). Linkage ( ) responsive to an input member ( ) moves the control valve ( ) to initially terminate communication from the second bore ( ) to the return port ( ) and direct the flow of a first portion of the supply hydraulic fluid to the chamber ( ) to effect a brake application while a second portion thereof is communicated to the steering gear ( ). A regulator ( ) is connected to the pump ( ) for receiving and directing the flow of supply hydraulic fluid to the inlet port ( ) of the housing ( ) of the booster ( ). The regulator ( ) responds to a preset hydraulic fluid pressure in the first portion of the supply hydraulic fluid by metering the flow of the supply pressurized hydraulic fluid to the inlet port ( ) of the brake booster and thereafter directly communicating a corresponding portion of the supply hydraulic fluid through a port ( ) to the steering gear ( ). The regulator ( ) on metering the supply hydraulic fluid to the inlet port ( ) establishing a maximum limit for the hydraulic pressure in that portion of the supply hydraulic fluid presented to the control chamber ( ) and to a chamber ( ) in an associated accumulator ( ).