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. 16, 1988
Filed:
Jul. 24, 1986
Namio Watanabe, Saitama, JP;
Akebono Brake Industry Co., Ltd., Tokyo, JP;
Akebono Research and Development Centre Ltd., Saitama, JP;
Abstract
A brake system with a hydraulic booster type braking hydraulic pressure generator includes a hydraulic pressure control device for controlling pressure in a first brake channel of a hydraulic pressure source, the control depends on a force exerted on a brake pedal. A hydraulic pressure generating device generates the hydraulic pressure of a second brake channel proportional to the hydraulic pressure in the first brake channel; and a fail-safe fluid chamber is capable of generating fail-safe hydraulic pressure in response to the motion of a piston depending on the force exerted on the brake pedal. A switch valve device is interposed between the fail-safe fluid chamber and a reservoir opens while receiving the hydraulic pressure of the first brake channel during brake application; and a hydraulic cylinder device generates braking hydraulic pressure of the first brake channel by either the hydraulic pressure generated at the fail-safe fluid chamber or the hydraulic pressure of the hydraulic pressure control device. In addition, a first valve of a normally-open type is disposed between the output side of the hydraulic pressure control device and an input chamber formed at one end of the power piston; and a second valve is disposed between the input chamber and a reservoir, with the first and second valves controlled by a signal from a control circuit detecting a skidding state of the wheels of a vehicle.