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:
Jun. 10, 1997
Filed:
Jun. 07, 1995
Shigeaki Yamamuro, Atsugi, JP;
Unisia Jecs Corporation, Atsugi, JP;
Abstract
A fluid pressure control valve comprises a valve housing slidably accommodating a valve spool which is responsive to an incoming fluid pressure for producing a controlled fluid pressure depending on an axial position of the spool, a biasing member disposed in the valve housing for biasing the spool in a pressure buildup direction, a reaction piston receiving the controlled fluid pressure to generate a reaction acting on the spool to move the spool in a pressure reduction direction, and an electromagnetic solenoid including a solenoid plunger having an outer diameter greater than the spool. The plunger engages the spool to move the spool in the pressure reduction direction by attraction of the solenoid. The biasing member includes a pilot piston engaging the spool and receiving the master-cylinder pressure to push the spool in the pressure buildup direction. A pressure-receiving area of the pilot piston is designed to be greater than that of the reaction piston by a predetermined amplification.