知搜-全球专利检索

  1. Login
  2. Sign Up

Search Results

25 records (took 0.019 seconds)

    Construction Machine
    1.
    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

    Applicant: Hitachi Construction Machinery Co., Ltd.

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

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

    Abstract: 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
    2.
    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

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Hiromasa TAKAHASHI ,  Kenji HIRAKU ,  Juri SHIMIZU ,  Shohei SUGIKI

    IPC: E02F9/22 ,  F15B20/00

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

    Abstract: 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
    3.
    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

    Applicant: Hitachi Construction Machinery Co., Ltd.

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

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

    CPC classification number: F16K11/07 ,  E02F9/2289 ,  F15B11/08 ,  F16H61/4104

    Abstract: 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.

    Working Machine
    4.
    发明申请
    Working Machine 审中-公开
    工作机

    公开(公告)号：US20160177539A1

    公开(公告)日：2016-06-23

    申请号：US14978702

    申请日：2015-12-22

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Kenji HIRAKU ,  Teppei SAITOH

    IPC: E02F3/42 ,  E02F9/22 ,  E02F3/43 ,  F15B11/10

    CPC classification number: E02F3/425 ,  E02F3/435 ,  E02F9/2239 ,  E02F9/2242 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/10 ,  F15B2211/20576 ,  F15B2211/56 ,  F15B2211/785 ,  Y02P80/13

    Abstract: Closed circuit lines (33, 43, 53, 63) for connecting hydraulic cylinders (17, 18, 19) and closed circuit pumps (31, 41, 51, 61) are provided with a charge pressure adjustment apparatus (75) via a charge line (72) to variably adjust the pressure in the charge line (72). An operating device (12) for operating the hydraulic cylinders (17, 18, 19) and the charge pressure adjustment apparatus (75) are connected to a control device (81). In the case of extending the hydraulic cylinders (17, 18, 19), the control device (81) increases a set pressure of the charge pressure adjustment apparatus (75) to be high to increase the pressure in the bottom side of the hydraulic cylinders (17, 18, 19) in accordance with an operating amount of the operating device (12).

    Abstract translation: 用于连接液压缸（17,18,19）和闭路泵（31,41,51,61）的闭路线路（33,43,53,63）经由充电器设置有充气压力调节装置（75） 线路（72）以可变地调节充电线（72）中的压力。 用于操作液压缸（17,18,19）和充气压力调节装置（75）的操作装置（12）连接到控制装置（81）。 在延伸液压缸（17,18,19）的情况下，控制装置（81）使加压压力调节装置（75）的设定压力升高，以增加液压缸底侧的压力 （17,18,19），根据操作装置（12）的操作量。

    Construction Machine
    5.
    发明申请
    Construction Machine 有权

    公开(公告)号：US20230085648A1

    公开(公告)日：2023-03-23

    申请号：US17909085

    申请日：2021-04-07

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Seiji HIJIKATA ,  Yasutaka TSURUGA ,  Kenji HIRAKU ,  Masatoshi HOSHINO

    IPC: E02F9/22 ,  F15B1/04 ,  F15B13/02 ,  F15B1/26

    Abstract: The object of the present invention resides in provision of a construction machine in which a hydraulic cylinder can be driven in a high efficiency by an accumulator. To this end, the construction machine including: a hydraulic cylinder; a first accumulator that accumulates return fluid from the hydraulic cylinder with a first set pressure; a tank that stores hydraulic fluid therein; a first hydraulic pump that delivers the hydraulic fluid sucked from the tank; a hydraulic actuator that is driven by the first hydraulic pump; and a second accumulator that accumulates return fluid from the hydraulic actuator with a second set pressure, includes a first control valve placed in a first hydraulic line that connects the first accumulator and the hydraulic cylinder to each other, and a second control valve placed in a second hydraulic line that connects the second accumulator and the hydraulic cylinder to each other. The second set pressure is set to a value higher than that of the first set pressure.

    Construction Machine
    6.
    发明申请
    Construction Machine 有权

    公开(公告)号：US20220074170A1

    公开(公告)日：2022-03-10

    申请号：US17417812

    申请日：2020-02-12

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Takamasa KAI ,  Juri SHIMIZU ,  Kenji HIRAKU ,  Hiromasa TAKAHASHI ,  Teppei SAITOU

    IPC: E02F9/22 ,  E02F9/20 ,  F15B13/02 ,  F15B13/04

    Abstract: To provide a construction machine that has a hydraulic system mounted thereon in which a closed-circuit pump, and an open-circuit pump and a proportional valve are arranged as a pair, and that makes it possible to use an unused open-circuit pump or proportional valve to accelerate the speed of a single rod hydraulic cylinder when the single rod hydraulic cylinder and a hydraulic motor are driven simultaneously. A controller (51) controls a cap-side selector valve (46) and a rod-side selector valve (47) such that a particular open-circuit pump (15) not connected to a single rod hydraulic cylinder (3) is connected to the single rod hydraulic cylinder, and controls an opening area of a particular proportional valve (49) provided on a flow line that connects a delivery port of the particular open-circuit pump to a tank, when the single rod hydraulic cylinder and a hydraulic motor (7) are driven simultaneously.

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

    公开(公告)号：US20190218750A1

    公开(公告)日：2019-07-18

    申请号：US16338519

    申请日：2017-11-16

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Teppei SAITOH ,  Kenji HIRAKU ,  Juri SHIMIZU ,  Hiromasa TAKAHASHI

    IPC: E02F9/22 ,  F15B20/00 ,  E02F3/36

    Abstract: This construction machine includes a first hydraulic drive device that is driven by a first prime mover and a second hydraulic drive device that is driven by a second prime mover. The first hydraulic drive device has a first closed circuit that connects a first hydraulic actuator and a first closed-circuit pump and a first assist flow path that connects the first closed circuit and a first open-circuit pump and that supplies pressure oil from the first open-circuit pump to the first closed circuit. The second hydraulic drive device is provided with a second closed circuit that connects a second hydraulic actuator and a second closed-circuit pump. The present invention also includes a first emergency flow path that branches from the first assist flow path and connects to the second closed circuit and that supplies pressure oil from the first open-circuit pump to the second closed circuit.

    Construction Machine
    9.
    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

    Applicant: Hitachi Construction Machinery Co., Ltd.

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

    IPC: E02F9/22

    Abstract: 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
    10.
    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

    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

    Inventor： Yuki AKIYAMA ,  Kenji HIRAKU ,  Hiromasa TAKAHASHI

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

    Abstract: 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.

Patent Agency Ranking