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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.:

US 10947973 B1

PDFFull Text
Date of Patent:
Mar. 16, 2021

Filed:

Jul. 14, 2016

Variable capacity oil pump

Applicant:

Hitachi Automotive Systems, Ltd., Hitachinaka, JP;

Inventors:

Atsushi Naganuma, Atsugi, JP;

Hideaki Ohnishi, Atsugi, JP;

Assignee:

HITACHI AUTOMOTIVE SYSTEMS, LTD., Ibaraki, JP;

Attorney:

Foley & Lardner LLP

Primary Examiner:

Theresa Trieu

Int. Cl.
CPC ...
F03C 2/00 (2006.01); F03C 4/00 (2006.01); F04C 2/00 (2006.01); F04C 14/22 (2006.01); F04C 2/344 (2006.01); F04C 14/28 (2006.01); F01M 1/02 (2006.01); F04C 14/24 (2006.01); F04C 15/00 (2006.01);
U.S. Cl.
CPC ...
F04C 14/226 (2013.01); F01M 1/02 (2013.01); F04C 2/344 (2013.01); F04C 2/3442 (2013.01); F04C 14/22 (2013.01); F04C 14/24 (2013.01); F04C 14/28 (2013.01); F04C 15/008 (2013.01); F04C 15/0065 (2013.01); F01M 2001/0238 (2013.01); F01M 2001/0246 (2013.01); F04C 2210/14 (2013.01); F04C 2240/811 (2013.01);
Abstract

A variable displacement oil pump includes: a pump constituting section; a movable member; an urging mechanism; a control hydraulic chamber group; a drain mechanism arranged to discharge the oil from a specific one control hydraulic chamber of the control hydraulic chamber group; and a control valve which into which the oil of an upstream side that is discharged from the discharge portion, or the oil from the control hydraulic chamber is introduced as a control hydraulic pressure, which is arranged to supply the oil of the upstream side that is discharged from the discharge portion to the specific one control hydraulic chamber, or to discharge the oil from the specific one control hydraulic chamber by the drain mechanism to regulate the pressure of the specific one control hydraulic chamber.

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