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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 9145860 B1

PDFFull Text
Date of Patent:
Sep. 29, 2015

Filed:

Aug. 20, 2010

High-pressure fuel supply pump

Applicants:

Satoshi Usui, Hitachinaka, JP;

Shigenori Tahara, Hitachinaka, JP;

Kenichiro Tokuo, Hitachinaka, JP;

Masashi Nemoto, Hitachinaka, JP;

Akihiro Munakata, Hitachinaka, JP;

Masayuki Suganami, Iwaki, JP;

Tatsuo Kawano, Hitachinaka, JP;

Inventors:

Satoshi Usui, Hitachinaka, JP;

Shigenori Tahara, Hitachinaka, JP;

Kenichiro Tokuo, Hitachinaka, JP;

Masashi Nemoto, Hitachinaka, JP;

Akihiro Munakata, Hitachinaka, JP;

Masayuki Suganami, Iwaki, JP;

Tatsuo Kawano, Hitachinaka, JP;

Assignee:

Hitachi Automotive Systems, Ltd., Hitachinaka-shi, JP;

Attorney:

Foley & Lardner LLP

Primary Examiner:

Thomas Moulis

Int. Cl.
CPC ...
F02M 55/02 (2006.01); F02M 59/46 (2006.01); F02M 59/10 (2006.01); F02M 59/36 (2006.01); F02M 37/00 (2006.01); F02M 55/04 (2006.01); F02M 63/02 (2006.01); F02M 63/00 (2006.01); F02M 69/04 (2006.01);
U.S. Cl.
CPC ...
F02M 59/462 (2013.01); F02M 37/0041 (2013.01); F02M 37/0052 (2013.01); F02M 55/04 (2013.01); F02M 59/102 (2013.01); F02M 59/368 (2013.01); F02M 63/029 (2013.01); F02M 63/0001 (2013.01); F02M 63/0265 (2013.01); F02M 69/046 (2013.01); F02M 2200/02 (2013.01);
Abstract

A high-pressure fuel supply pump which has no probability of discontinuity of a thin film of fuel at a sliding portion even when the fuel is not needed to be compressed to a high pressure is obtained. Two low-pressure fuel ports are provided on the high-pressure fuel supply pump in addition to a high-pressure discharge port to a high-pressure fuel capacity chamber. One of the two low-pressure fuel ports is connected to a low-pressure fuel capacity chamber and remaining one is connected to a low-pressure fuel supply pump. Accordingly, the interior of the high-pressure fuel supply pump is always filled with fresh fuel even in a mode in which a high-pressure fuel injecting valve does not inject fuel and only a low-pressure fuel injection valve injects fuel, so that a temperature rise of a plunger and a cylinder is prevented and locking of the plunger and the cylinder can be prevented.

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