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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 10280593 B1

PDFFull Text
Date of Patent:
May. 07, 2019

Filed:

May. 16, 2014

Hydraulic fluid energy regeneration device for work machine

Applicant:

Hitachi Construction Machinery Co., Ltd., Taito-ku, Tokyo, JP;

Inventors:

Seiji Hijikata, Tuskuba, JP;

Kouji Ishikawa, Kasumigaura, JP;

Takatoshi Ooki, Kasumigaura, JP;

Shinya Imura, Toride, JP;

Assignee:

Hitachi Construction Machinery Co., Ltd., Tokyo, JP;

Attorney:

Crowell & Moring LLP

Primary Examiner:

Abiy Teka

Int. Cl.
CPC ...
F15B 21/14 (2006.01); E02F 9/22 (2006.01); F15B 11/16 (2006.01); F15B 13/06 (2006.01); F15B 21/08 (2006.01); E02F 9/20 (2006.01); F04B 49/00 (2006.01); E02F 3/32 (2006.01);
U.S. Cl.
CPC ...
E02F 9/2217 (2013.01); E02F 9/2095 (2013.01); E02F 9/2232 (2013.01); E02F 9/2235 (2013.01); E02F 9/2242 (2013.01); E02F 9/2292 (2013.01); E02F 9/2296 (2013.01); F04B 49/00 (2013.01); F15B 11/16 (2013.01); F15B 13/06 (2013.01); F15B 21/087 (2013.01); F15B 21/14 (2013.01); E02F 3/32 (2013.01); F15B 2211/20515 (2013.01); F15B 2211/20523 (2013.01); F15B 2211/20546 (2013.01); F15B 2211/20576 (2013.01); F15B 2211/255 (2013.01); F15B 2211/61 (2013.01); F15B 2211/6309 (2013.01); F15B 2211/6313 (2013.01); F15B 2211/6316 (2013.01); F15B 2211/6652 (2013.01); F15B 2211/6654 (2013.01);
Abstract

Provided is a hydraulic fluid energy regeneration device for a work machine, including: a regeneration hydraulic motor driven by discharged return hydraulic fluid; a first hydraulic pump mechanically connected to the regeneration hydraulic motor; a second hydraulic pump that delivers an hydraulic fluid for driving a first hydraulic actuator and/or a second hydraulic actuator; a junction line that allows the hydraulic fluid delivered by the second hydraulic pump to be joined; a second regulator that regulates the delivery flow rate of the second hydraulic pump; and a first regulator that regulates the flow rate of the hydraulic fluid coming from the first hydraulic pump and flowing through the junction line. A control unit includes: a first computing part that calculates a demanded pump flow rate in accordance with the input target replacement command for the second hydraulic pump, the first computing part further outputting a control command to the first regulator in such a manner that the flow rate of the hydraulic fluid coming from the first hydraulic pump and flowing through the junction line equals to or lower than the demanded pump flow rate; and a second computing part that subtracts from the demanded pump flow rate the flow rate of the hydraulic fluid coming from the first hydraulic pump to obtain a target pump flow rate, the second computing part further outputting a control command to the second regulator in such a manner that the calculated target pump flow rate is attained.

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