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. 14, 1991
Filed:
Nov. 02, 1989
Akira Suzuki, Aichi, JP;
Katsuya Tanaka, Aichi, JP;
Aisin AW Kabushiki Kaisha, , JP;
Abstract
A pressure control valve has a valve sleeve, a spool valve mounted for sliding in the valve sleeve in response to a load by an electromagnet, a spring load, and an output pressure feedback load, and the electromagnet portion capable of moving the spool valve. The spool valve has an oil passage capable of feeding back the output pressure, the feedback oil passage being formed diagonally in the land portion. A periphery of an end surface of the land portion, or the same of the supply port, output port, or the exhaust port of the sleeve is provided with a cutout. Output pressure generated at the output port is transmitted through the feedback oil passage, thereby damping and stabilizing the operation of the spool valve. Since the cutout is formed as described above, a rapid pressure change due to the movement of the spool valve can be eliminated, preventing generation of buzz.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile