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:
Mar. 03, 2020
Filed:
Dec. 20, 2016
Showa Corporation, Gyoda-shi, JP;
Toshio Nishikawa, Haga-gun, JP;
Showa Corporation, Gyoda-shi, JP;
Abstract
An embodiment provides a vane pump device. In the vane pump device, vane grooves of a rotor include columnar grooves which accommodate oil, and support the vanes. An inner-plate low pressure side recess portion and an inner-plate high pressure supply region are provided along a rotation direction of the rotor. The inner-plate low pressure side recess portion supplies oil to the columnar grooves at a first pressure, and the inner-plate high pressure supply region supplies oil at a second pressure higher than the first pressure. A size from an inner-plate low pressure side recess portion downstream end to an inner-plate high pressure side through-hole upstream end in the rotation direction is different from that from an inner-plate high pressure side recess portion downstream end to an inner-plate low pressure side recess portion upstream end in the rotation direction.