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19 条记录 (耗时 0.019 秒)

    Construction Machine
    1.
    发明申请
    Construction Machine 有权

    公开(公告)号：US20220364337A1

    公开(公告)日：2022-11-17

    申请号：US17765570

    申请日：2020-09-30

    申请人： Hitachi Construction Machinery Co., Ltd.

    发明人： Juri SHIMIZU ,  Kenji HIRAKU ,  Hiromasa TAKAHASHI ,  Teppei SAITOH

    IPC分类号： E02F9/26 ,  E02F9/22 ,  E02F3/43 ,  E02F3/42

    摘要： A construction machine that makes it possible for an operator to linearly push a bucket simply by operating an arm in a pushing direction is provided. A controller 50 is configured to, in a case where a straight locus is selected by a bucket locus selecting device 52, calculate a constant flow rate ratio α according to a boom initial angle that is an angle of a boom 2 sensed by a boom angle sensor 33 at a time point when an arm 4 is operated in a pushing direction by an operation device 51, and control the delivery flow rate of a first hydraulic pump 12 such that a hydraulic fluid is discharged from a cap chamber 1a of a boom cylinder 1 at a flow rate Qb obtained by multiplying a flow rate Qa of a flow supplied to a cap chamber 3a of an arm cylinder 3 by the flow rate ratio α while the arm 4 is operated in the pushing direction by the operation device 51 and there is not an instruction for operation of the boom 2.

    Work Machine Driving Device
    2.
    发明申请
    Work Machine Driving Device 有权
    工作机械驱动装置

    公开(公告)号：US20160208459A1

    公开(公告)日：2016-07-21

    申请号：US14915344

    申请日：2014-11-07

    申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.

    发明人： Hiromasa TAKAHASHI

    IPC分类号： E02F9/22 ,  E02F3/42 ,  F15B11/17 ,  E02F3/43

    CPC分类号： E02F3/435 ,  E02F9/2207 ,  E02F9/2235 ,  E02F9/2289 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/17 ,  F15B2211/20561 ,  F15B2211/20569 ,  F15B2211/20576 ,  F15B2211/27 ,  F15B2211/30595 ,  F15B2211/71

    摘要： Provided is a work machine driving device which can reduce unnecessary switching control of switching valves. The present invention is configured so that at least two closed-circuit hydraulic pumps 2a to 2f can be connected in a closed loop to any one of hydraulic actuators 7a to 7c, 10c through electromagnetic switching valves 12, in which a controller 16 includes a priority order calculating circuit 31 which calculates the allocation of the closed-circuit hydraulic pumps 2a to 2f to the hydraulic actuators 7a to 7c, 10c according to operation of operation levers 17a, 17b and a priority order map 32 determining priority connection relationships between the closed-circuit hydraulic pumps 2a to 2f and the hydraulic actuators 7a to 7c, 10c, and the priority order calculating circuit 31 selects and allocates an unallocated closed-circuit hydraulic pump 2a to 2f when the number of closed-circuit hydraulic pumps 2a to 2f to be allocated increases.

    摘要翻译： 提供了可以减少开关阀的不必要的开关控制的作业机驱动装置。 本发明被构造成使得至少两个闭路液压泵2a至2f可以通过电磁切换阀12以闭环方式连接到液压致动器7a至7c，10c中的任何一个，其中控制器16包括优先级 根据操作杆17a，17b的操作，计算闭锁液压泵2a〜2f向液压致动器7a〜7c，10c的分配的顺序计算电路31以及确定闭路液压泵2a〜 电动液压泵2a〜2f以及液压致动器7a〜7c，10c，优先顺序运算电路31选择并分配闭路液压泵2a〜2f的数量为未​​分配的闭路液压泵2a〜2f 分配增加。

    Construction Machine
    4.
    发明申请
    Construction Machine 有权

    公开(公告)号：US20210246634A1

    公开(公告)日：2021-08-12

    申请号：US17056288

    申请日：2019-05-20

    申请人： Hitachi Construction Machinery Co., Ltd.

    发明人： Juri SHIMIZU ,  Kenji HIRAKU ,  Hiromasa TAKAHASHI ,  Teppei SAITOU ,  Shouhei SUGIKI

    IPC分类号： E02F9/22

    摘要： An object of the present invention is to provide a construction machine capable of suppressing lugging down of an engine irrespective of contents of operation of an operator and the load state of a hydraulic actuator. A controller 50 includes: a demanded torque estimating section 50c configured to estimate demanded torque as torque demanded from an engine 9 by the first hydraulic pump on the basis of a demanded velocity of a first hydraulic actuator 1 and a load pressure on the first hydraulic actuator; a demanded velocity limiting section 50d configured to, in a case in which a demanded torque change rate as a change rate of the demanded torque exceeds a predetermined change rate, limit the demanded velocity such that the demanded torque change rate becomes equal to or lower than the predetermined change rate; and a command calculating section 50e configured to calculate a delivery flow rate of the first hydraulic pump on the basis of the demanded velocity of the first hydraulic actuator, the demanded velocity being limited by the demanded velocity limiting section.

    WORK MACHINE
    5.
    发明申请
    WORK MACHINE 审中-公开

    公开(公告)号：US20180238028A1

    公开(公告)日：2018-08-23

    申请号：US15752980

    申请日：2016-08-29

    申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.

    发明人： Yuki AKIYAMA ,  Kenji HIRAKU ,  Hiromasa TAKAHASHI

    IPC分类号： E02F9/22 ,  F04B49/06 ,  F04B49/08 ,  E02F9/26

    摘要： A work machine that can detect abnormality such as a malfunction and wear and tear of each of hydraulic pumps including control equipment with high precision and that can reduce equipment cost is provided. A controller 9 according to the present invention includes a volumetric-transfer-efficiency-calculating section 94 that calculates a volumetric transfer efficiency ηC representing a transfer efficiency of hydraulic oil between a hydraulic cylinder 11 and hydraulic pumps 21 to 23 on the basis of a target discharge flow rate calculated by a target-discharge-flow-rate-calculating section 932 and the speed of the hydraulic cylinder 11 that is detected by a speed sensor 28, and an abnormality decision section 95 that decides whether any one of the hydraulic pumps 21 to 23 is abnormal on the basis of the volumetric transfer efficiency ηC calculated by the volumetric-transfer-efficiency-calculating section 94.

    Construction Machine
    7.
    发明申请
    Construction Machine 审中-公开

    公开(公告)号：US20190078594A1

    公开(公告)日：2019-03-14

    申请号：US16084882

    申请日：2017-06-26

    申请人： Hitachi Construction Machinery Co., Ltd.

    发明人： Teppei SAITOH ,  Juri SHIMIZU ,  Kenji HIRAKU ,  Hiromasa TAKAHASHI ,  Shouhei SUGIKI

    IPC分类号： F15B20/00 ,  E02F9/24 ,  F15B11/02 ,  F15B11/08 ,  E02F9/22

    摘要： Provided is a construction machine capable of detecting a stuck-open state of a surplus flow control valve in real time during operation without involving a reduction in the operational speed. The construction machine is equipped with: a surplus flow control valve control section configured to output a closing command to a first surplus flow control valve at the operation start when an operation amount signal of an operation lever device is detected; a pump delivery control section configured to output a delivery flow rate command to an adjustment section of an open circuit pump; an assist valve control section configured to continue to output a closing command from before to an assist valve; a sticking detection determination section configured to compare a pressure signal with a previously set threshold value and determining that the surplus flow control valve is in a stuck-open state when the pressure signal is less than the threshold value and determining that the surplus flow control valve is normal when the pressure signal exceeds the threshold value; and a stop signal generating section configured to input therein a sticking determination signal, output in the case of a stuck-open state a control signal maintaining a closed state of the assist valve to the assist valve control section, and output in the case of a normal state a control signal causing the assist valve to perform an opening operation to the assist valve control section.

    Drive System for Construction Machine
    8.
    发明申请
    Drive System for Construction Machine 有权

    公开(公告)号：US20180251960A1

    公开(公告)日：2018-09-06

    申请号：US15848051

    申请日：2017-12-20

    申请人： Hitachi Construction Machinery Co., Ltd.

    发明人： Hiromasa TAKAHASHI ,  Kenji HIRAKU ,  Juri SHIMIZU ,  Shohei SUGIKI

    IPC分类号： E02F9/22 ,  F15B20/00

    CPC分类号： E02F9/2232 ,  E02F9/2235 ,  E02F9/2296 ,  F15B20/00 ,  F15B2211/20515 ,  F15B2211/30595 ,  F15B2211/6654 ,  F15B2211/7056 ,  F15B2211/7142

    摘要： A drive system for a construction machine capable of appropriately controlling a distribution flow rate to each hydraulic actuator and improving operability by an operator is provided. A flow rate distribution section that computes a distribution flow rate of a hydraulic fluid supplied to each of a plurality of hydraulic actuators on the basis of a demanded flow rate, sets, within a distributable region set for computing a range of a distributable flow rate that is a flow rate of the hydraulic fluid suppliable to each of at least two hydraulic actuators driven by a combined operation among the plurality of hydraulic actuators from a plurality of hydraulic pump devices for the at least two hydraulic actuators, a distribution region for computing a range of the distribution flow rate of the hydraulic fluid actually supplied to each of the at least two hydraulic actuators, and computes the distribution flow rate in such a manner that the distribution flow rate falls within the distribution region and a ratio among the distribution flow rates of the plurality of hydraulic actuators is equal to a ratio among the demanded flow rates of the plurality of hydraulic actuators.

    Work Machine
    9.
    发明申请
    Work Machine 审中-公开

    公开(公告)号：US20180135764A1

    公开(公告)日：2018-05-17

    申请号：US15577847

    申请日：2016-02-25

    申请人： Hitachi Construction Machinery Co., Ltd.

    发明人： Juri SHIMIZU ,  Teppei SAITOH ,  Kenji HIRAKU ,  Yuki AKIYAMA ,  Hiromasa TAKAHASHI

    IPC分类号： F16K11/07 ,  F16H61/4104 ,  F15B11/08

    CPC分类号： F16K11/07 ,  E02F9/2289 ,  F15B11/08 ,  F16H61/4104

    摘要： A work machine includes a closed circuit system in which there is provided a flushing valve. The flushing valve is equipped with: a valve main body; a spool which can select, in accordance with a position where the spool is arranged in the valve main body, connection between a first flow line and a third flow line, connection between a second flow line and the third flow line, or interruption of the connection between the first flow line, the second flow line, and the third flow line; a first liquid chamber that is provided inside the valve main body and into which a hydraulic working fluid from the first flow line flows; a first piston pressurizing the hydraulic working fluid having flowed into the first liquid chamber and moving the spool to a position where the second flow line and the third flow line are connected together, by the hydraulic pressure of the first liquid chamber; a second liquid chamber that is provided inside the valve main body and into which the hydraulic working fluid from the second flow line flows; and a second piston pressurizing the hydraulic working fluid having flowed into the second liquid chamber and moving the spool to a position where the first flow line and the third flow line are connected together, by the hydraulic pressure of the second liquid chamber.