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:
Aug. 31, 2004
Filed:
Oct. 01, 2002
Keita Nakano, Itami, JP;
Sumitomo (SEI) Brake Systems, Inc., Mie, JP;
Abstract
A hydraulic pressure control device is provided which is capable of pressure reduction and pressure increase by electronic control without changing over hydraulic circuits, and which is reliable and simple in structure. A vehicle brake device using such a control device is also provided. A pressure chamber and an offset spring are provided in a hydraulic pressure control valve. A spool valve is moved to a position corresponding to brake operating force, thereby changing over connections between the output port and the discharge port and between the output port and the input port, and adjusting the degrees of opening of valve portions. In this manner, the hydraulic pressure at the output port to a value corresponding to the brake operating force is controlled.