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:
Oct. 13, 1992
Filed:
Mar. 07, 1991
Hideo Konishi, Saitama, JP;
Junkichi Odai, Saitama, JP;
Jidosha Kiki Co., Ltd., Tokyo, JP;
Abstract
A device for improving the starting response of a vane pump and for reducing the power loss during a high speed operation of the pump. The vane pump includes a rotor formed with slits, in which slits vanes are slidably disposed. To drive the respective vanes into abutment against a cam ring, a pair of plates which hold the rotor and the cam ring sandwiched therebetween are formed with a plurality of arcuate grooves, into which a discharged oil is introduced. Rather than providing a narrow groove formed in the same plate as that in which the arcuate grooves are formed to provide a communication therebetween, an annular groove is formed in the lateral surface of the rotor to replace the narrow groove or in addition to the narrow groove, and is constructed so that the narrow groove is interrupted by the vanes as the vanes retract, the annular groove providing a communication between the arcuate grooves when a respective vane is driven radially outwardly.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile