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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 10801532 B1

PDFFull Text
Date of Patent:
Oct. 13, 2020

Filed:

Mar. 29, 2017

Work machine

Applicant:

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

Inventors:

Yuichi Ogawa, Tsuchiura, JP;

Seiji Hijikata, Tsukuba, JP;

Masatoshi Hoshino, Tsuchiura, JP;

Kiwamu Takahashi, Moriyama, JP;

Kouji Ishikawa, Kasumigaura, JP;

Assignee:

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

Attorney:

Crowell & Moring LLP

Primary Examiner:

Michael Leslie

Int. Cl.
CPC ...
F15B 21/14 (2006.01); E02F 9/22 (2006.01); E02F 9/20 (2006.01); E02F 3/42 (2006.01); E02F 3/43 (2006.01); F15B 11/10 (2006.01); F15B 1/02 (2006.01); E02F 3/32 (2006.01); F15B 21/047 (2019.01); F15B 21/044 (2019.01); F15B 21/08 (2006.01); F15B 1/033 (2006.01);
U.S. Cl.
CPC ...
F15B 21/14 (2013.01); E02F 3/32 (2013.01); E02F 3/425 (2013.01); E02F 3/435 (2013.01); E02F 9/2004 (2013.01); E02F 9/22 (2013.01); E02F 9/2217 (2013.01); E02F 9/2225 (2013.01); E02F 9/2246 (2013.01); E02F 9/2267 (2013.01); E02F 9/2271 (2013.01); E02F 9/2285 (2013.01); E02F 9/2292 (2013.01); F15B 1/024 (2013.01); F15B 11/10 (2013.01); F15B 21/044 (2013.01); F15B 21/047 (2013.01); F15B 21/087 (2013.01); E02F 9/2296 (2013.01); F15B 1/033 (2013.01); F15B 2201/51 (2013.01); F15B 2211/20523 (2013.01); F15B 2211/20546 (2013.01); F15B 2211/20576 (2013.01); F15B 2211/212 (2013.01); F15B 2211/275 (2013.01); F15B 2211/3116 (2013.01); F15B 2211/329 (2013.01); F15B 2211/41527 (2013.01); F15B 2211/575 (2013.01); F15B 2211/625 (2013.01); F15B 2211/633 (2013.01); F15B 2211/635 (2013.01); F15B 2211/6306 (2013.01); F15B 2211/6309 (2013.01); F15B 2211/6316 (2013.01); F15B 2211/6355 (2013.01); F15B 2211/7053 (2013.01); F15B 2211/85 (2013.01); F15B 2211/853 (2013.01); F15B 2211/857 (2013.01);
Abstract

A work machine including: a hydraulic cylinderconfigured to drive a work implement; a control valveconfigured to connect a delivery line of a hydraulic pumpswitchingly to a bottom fluid chamber and a rod fluid chamber of the hydraulic cylinderand a tank; a pilot pumpconfigured to output a pilot pressure to drive the control valve; an engineconfigured to drive the hydraulic pumpand the pilot pump; and an accumulatorconfigured to accumulate a return hydraulic fluid from the hydraulic cylinderis provided with: a bypass lineconfigured to connect the bottom fluid chamber of the hydraulic cylinderand a delivery lineof the hydraulic pumpby bypassing the control valveand be provided with the accumulatorthereon; a pressure-accumulation control valveprovided between the bottom fluid chamber of the hydraulic cylinderand the accumulator; a release control valveprovided between the accumulatorand the delivery line; and a hydraulic system controllerconfigured to open the release control valveif an engine revolution speed N becomes lower than a set value Ns.

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