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:
Nov. 09, 2021
Filed:
Feb. 06, 2017
Hitachi Automotive Systems, Ltd., Hitachinaka, JP;
HITACHI ASTEMO, LTD., Hitachinaka, JP;
Abstract
Variable displacement pump has first control hydraulic chambergiving force to cam ringin direction that decreases volume variation of each pump chamberby internal pressure, second control hydraulic chambergiving force to cam ring in direction that increases volume variation of each pump chamber by internal pressure, first seal surfaceformed on both end surfaces of cam ring, which are in sliding-contact with both opposing inside surfaces of pump bodyand cover member, and sealing gap between each pump chamber and first control hydraulic chamber, and second seal surfacesealing gap between each pump chamber and second control hydraulic chamber at outlet section side. Radial direction width Wof second seal surface is greater than that Wof first seal surface. Increase in weight of the pump can be suppressed while suppressing increase in pump control pressure against intention of control.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile