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:
Oct. 10, 1978
Filed:
Aug. 16, 1977
Naosuke Masuda, Higashi-Matsuyama, JP;
Jidosha Kiki Co., Ltd., Tokyo, JP;
Abstract
An hydraulic braking pressure control unit for a vehicle includes a first valve member installed at an intermediate point in a flow passage providing communication between the rear brake system of a tandem master cylinder and rear wheel cylinders, the valve member is adapted to open and close the passage, and a proportioning valve is normally urged in one direction to keep the valve member away from its seat to establish communication between the tandem master cylinder and the rear wheel cylinders. The proportioning valve is adapted, when the braking pressure is supplied from the tandem master cylinder, to reduce the braking pressure at a predetermined rate and supply the reduced braking pressure to the rear wheel cylinders. A passage is provided for communication between passages formed upstream and downstream of the proportioning valve, and a second valve member is arranged to open and close the communicating passage. The second valve member has a passage formed on its side facing the opening direction for the flow of the braking pressure for the rear brake system of the tandem master cylinder and also has a passage formed on its side facing the closing direction for the flow of the braking pressure for the front brake system of the tandem master cylinder. The second valve member is in the closed position when it is subjected to the braking pressures of both the rear and front brake systems.