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:
Mar. 09, 1999
Filed:
Aug. 22, 1997
Richard Lee Harbaugh, South Bend, IN (US);
Robert Bosch Technology Corporation, Broadview, IL (US);
Abstract
A brake system (10) having a proportioning device (18) through which a first fluid pressure is communicated to a first brake circuit and a second fluid pressure is communicated to a second brake circuit. The proportioning device (18) has a housing (90) with a first bore (204) connected with a first passage (98) for receiving the first fluid pressure and with a second passage (100) for receiving the second fluid pressure. A first piston (210) located in the first bore (204) of the housing (90) separates the first passage (98) from the second passage (100). The first piston (210) responds to a higher fluid pressure of the first and second fluid pressures by moving in the first bore (204) to providing additional fluid pressure to a lower fluid pressure of the first and second fluid pressures to substantially equalize the first and second fluid pressures supplied to the first and second brakes circuits for effecting said brake application. A second piston (110) located in a second bore (104) of the housing (90) separates the first passage (98) from the second passage (100). The second piston (110) responds to a pressure differential between the first and second fluid pressures to interrupt communication to the first or second brake circuit correspondingly connected to the lower fluid pressure while opening communication (124,126) with a reservoir (96) for the lower fluid pressure to prevent loss of fluid from the brake system.