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. 25, 2014
Filed:
Apr. 21, 2011
Tsutomu Furuhashi, West Bloomfield, MI (US);
Rebecca Spence, Novi, MI (US);
Joseph Lubinski, South Lyon, MI (US);
Dhyana Ramamurthy, Novi, MI (US);
Kaoru Oda, Toyokawa, JP;
Tsutomu Furuhashi, West Bloomfield, MI (US);
Rebecca Spence, Novi, MI (US);
Joseph Lubinski, South Lyon, MI (US);
Dhyana Ramamurthy, Novi, MI (US);
Kaoru Oda, Toyokawa, JP;
DENSO International America, Inc., Southfield, MI (US);
DENSO CORPORATION, Kariya-shi, JP;
Abstract
A pump may have a first chamber and a solenoid coil to control movement of a first valve member. A second chamber may have a second valve member to control fluid moving into a third chamber. A first fluid passageway may link the first and second chambers, a second passageway may link second and third chambers and a third passageway may link third and fourth chambers. After pressurizing the third chamber causing fluid to flow into and leave a fourth chamber, the third chamber depressurizes due to downward movement of a plunger. Upon depressurization with a solenoid coil energized, second valve member floats and then moves against a valve seat. While the second valve member is moving toward the valve seat, the solenoid coil is de-energized causing the first valve member to move and strike the second valve member when the second valve member is moving at maximum velocity.