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. 07, 2001
Filed:
Oct. 07, 1999
James C. Potter, Novi, MI (US);
Eaton Corporation, Cleveland, OH (US);
Abstract
A variable force solenoid operated pressure control valve for controlling an hydraulically operated actuator in a fluid pressure circuit. The valve has a spool in a straight spool bore with fluid pressure chambers at opposite ends. One spool end has a rod press fitted therein with the rod extending through the fluid pressure chamber and operatively contacting the solenoid armature. The rod creates an area differential on the spool ends for providing an axial spool force proportional to the pressure in the fluid chambers which are each connected by a metering passage in the spool to a recess on the spool which is continuously connected to a control pressure port. A supply port is connected to the recess by a first valving land on the spool and an exhaust port is connected to the recess by a second valving land on the spool. The metering passages serve to attenuate transients.