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. 31, 2011
Filed:
Mar. 27, 2008
Masaya Nakai, Anjo, JP;
Takahiro Kokubu, Anjo, JP;
Masaya Nakai, Anjo, JP;
Takahiro Kokubu, Anjo, JP;
Aisin Aw Co., Ltd., Aichi-ken, JP;
Abstract
In a solenoid valve including a cylindrical sleeve which is formed with an input port, an output port, a drain port and a feedback port, and a spool which is inserted into the sleeve and which is formed with a plurality of lands for closing the individual ports, and a communication portion for communicating the individual ports; an input notch is formed in an end edge of the land located near the input port, while a drain notch is formed in an end edge of the land located near the drain port, and an axial height Hin of the input notch and an axial height Hdr of the drain notch are set so that the proportion α (=Hin/(Hin+Hdr)) of the height Hin to the sum of the heights Hin and Hdr may fall within a range of at least 0.72 (preferably, 0.85) and less than 1.0.