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:
May. 10, 2011
Filed:
May. 18, 2007
Kanehisa Nagasaki, Ichinomiya, JP;
Ryo Ishibashi, Kariya, JP;
Kanehisa Nagasaki, Ichinomiya, JP;
Ryo Ishibashi, Kariya, JP;
Denso Corporation, Kariya, JP;
Abstract
In an electromagnetic hydraulic pressure control valve of an N/L type, an electromagnetic actuator provides a force to a spool, which is slidably received in a valve housing, in a valve opening direction for opening an input port of the valve housing. A return spring provides a force to the spool in the valve closing direction. A constriction is provided to constrict a flow passage cross sectional area in a fluid passage, which extends from the input port to a hydraulic servo. A negative pressure port opens in a direction generally perpendicular to a flow direction of a fluid at a location, at which a fluid velocity of the fluid is accelerated by the constriction. A negative pressure guide passage communicates between the negative pressure port and a feedback chamber defined in the valve housing.