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. 27, 1979
Filed:
Nov. 02, 1977
Hiroshi Takeshita, Chiryu, JP;
Takashi Nagashima, Toyota, JP;
Aisin Seiki Kabushiki Kaisha, Kariya, JP;
Abstract
An improved hydraulic brake control assembly for automotive vehicles having a proportioning valve for regulating the hydraulic pressure applied to the rear wheel brakes from a master brake cylinder in accordance with vehicular load. A control device responsive to vehicular deceleration and hydraulic pressure from the master brake cylinder controls the proportioning valve by a slidable piston of the control device applying an urging force on the proportioning valve varied in response to the hydraulic pressure applied to the slidable piston. The hydraulic pressure from the master brake cylinder applied to the slidable piston is modified by first valve, a second pressure-sensitive valve and an orifice. The first valve controls admission of the hydraulic pressure to the slidable piston in response to predetermined vehicular deceleration, the orifice and the second valve being in parallel, the hydraulic pressure normally being supplied to the slidable piston through the orifice. The normally-closed second valve is opened when a predetermined hydraulic pressure difference is reached on opposing sides of the orifice for supplying the hydraulic pressure to the slidable piston without pressure throttling by the orifice. The proportioning valve therefore operates to provide a proper hydraulic pressure to the rear wheel brakes in accordance with different vehicular loads and braking applications.