Work machine

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 10801532
APP PUB NO 20190186106A1
SERIAL NO

16327928

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A work machine including: a hydraulic cylinder 20 configured to drive a work implement 3; a control valve 22 configured to connect a delivery line of a hydraulic pump 21 switchingly to a bottom fluid chamber and a rod fluid chamber of the hydraulic cylinder 20 and a tank; a pilot pump 23 configured to output a pilot pressure to drive the control valve 22; an engine 24 configured to drive the hydraulic pump 21 and the pilot pump 23; and an accumulator 26 configured to accumulate a return hydraulic fluid from the hydraulic cylinder 20 is provided with: a bypass line 41 configured to connect the bottom fluid chamber of the hydraulic cylinder 20 and a delivery line 21a of the hydraulic pump 21 by bypassing the control valve 22 and be provided with the accumulator 26 thereon; a pressure-accumulation control valve 27 provided between the bottom fluid chamber of the hydraulic cylinder 20 and the accumulator 26; a release control valve 28 provided between the accumulator 26 and the delivery line 21a; and a hydraulic system controller 30 configured to open the release control valve 28 if an engine revolution speed N becomes lower than a set value Ns.

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First Claim

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Family

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Patent Owner(s)

Patent OwnerAddress
HITACHI CONSTRUCTION MACHINERY CO LTD16-1 HIGASHIUENO 2-CHOME TAITO-KU TOKYO 110-0015

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hijikata, Seiji Tsukuba, JP 44 184
Hoshino, Masatoshi Tsuchiura, JP 77 1221
Ishikawa, Kouji Kasumigaura, JP 159 1336
Ogawa, Yuichi Tsuchiura, JP 118 745
Takahashi, Kiwamu Moriyama, JP 78 336

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7.5 Year Payment $3600.00 $1800.00 $900.00 Apr 13, 2028
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