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. 10, 1992
Filed:
Apr. 25, 1990
Yoshiki Takai, Kanagawa, JP;
Teruhiko Mochizuki, Kanagawa, JP;
Atsugi Unisia Corporation, Kanagawa, JP;
Abstract
A variable discharge pump comprises a plurality of pumping units, each pumping unit including an outlet port discharging a particular volumetric discharge of working fluid, a plurality of outlet passages respectively communicating the outlet ports of each of the pumping units. Each of the outlet passages includes a supply passage provided for supplying the working fluid to a driven apparatus and a reflux passage provided for returning the working fluid to a working fluid reservoir, both being branched from the outlet passage. The variable discharge pump also includes an electromagnetic valve associated with the outlet passages for selectively switching a plurality of flow passages for the working fluid supplied from each of the outlet ports to either the supply passage or the reflux passage so as to provide a plurality of different volumetric discharges by combination of the particular volumetric discharges from each of the outlet ports and includes a plurality of check valves provided in each of the supply passages so as to prevent back-flow of the working fluid.