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    Hydraulic Drive System for Construction Machine
    1.
    发明申请
    Hydraulic Drive System for Construction Machine 有权
    施工机械液压驱动系统

    公开(公告)号：US20150377258A1

    公开(公告)日：2015-12-31

    申请号：US14767480

    申请日：2014-03-17

    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

    Inventor： Kiwamu TAKAHASHI ,  Yasutaka TSURUGA ,  Yoshifumi TAKEBAYASHI ,  Kazushige MORI ,  Natsuki NAKAMURA

    IPC: F15B11/16 ,  F15B11/17

    CPC classification number: F15B11/166 ,  E02F3/325 ,  E02F9/2239 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/17 ,  F15B2211/20553 ,  F15B2211/20576 ,  F15B2211/253 ,  F15B2211/2656 ,  F15B2211/30535 ,  F15B2211/30595 ,  F15B2211/6658 ,  F15B2211/7135 ,  F15B2211/7142 ,  F15B2211/88

    Abstract: In addition to a main pump 102 having two delivery ports 102a and 102b and performing the load sensing control, two subsidiary pumps 202 and 302 for the load sensing control for respectively performing assist driving on a boom cylinder 3a and an arm cylinder 3b are provided. When driving the boom cylinder 3a or the arm cylinder 3b, a selector valve 141 or 241 is switched and flows of hydraulic fluid are merged together and supplied to the boom cylinder 3a or the arm cylinder 3b. When driving actuators other than the boom cylinder 3a or the arm cylinder 3b, only the hydraulic fluid from the main pump is supplied to the actuators. In short, the hydraulic drive system is configured so that two specific actuators having great demanded flow rates and tending to have a great load pressure difference between each other when driving at the same time can be driven with hydraulic fluid delivered from separate delivery ports. With this configuration, wasteful energy consumption due to pressure loss in a pressure compensating valve can be suppressed, and in cases of driving an actuator of a low demanded flow rate, the hydraulic pump can be used at a point where the volume efficiency is high.

    Abstract translation: 除了具有两个输送口102a和102b并执行负载感测控制的主泵102之外，还提供了用于分别在动臂缸3a和臂缸3b上执行辅助驱动的负载感测控制的两个辅助泵202和302。 当驱动动臂缸3a或臂缸3b时，选择阀141或241被切换并且液压流体的流动被合并在一起并供给到动臂缸3a或臂缸3b。 当驱动除了动臂缸3a或臂缸3b之外的致动器时，仅将来自主泵的液压流体供给到致动器。 简而言之，液压驱动系统被构造成使得具有很大要求流量并且倾向于在同时驱动时彼此之间具有很大负载压力差的两个特定致动器可以由从单独的输送口输送的液压流体驱动。 由此，能够抑制因压力补偿阀的压力损失引起的浪费的能量消耗，在驱动低要求流量的致动器的情况下，可以在体积效率高的点使用液压泵。

    HYDRAULIC DRIVE SYSTEM FOR CONSTRUCTION MACHINE
    3.
    发明申请
    HYDRAULIC DRIVE SYSTEM FOR CONSTRUCTION MACHINE 有权
    液压驱动系统

    公开(公告)号：US20170037601A1

    公开(公告)日：2017-02-09

    申请号：US15038179

    申请日：2014-12-02

    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

    Inventor： Kiwamu TAKAHASHI ,  Kazushige MORI ,  Yoshifumi TAKEBAYASHI ,  Natsuki NAKAMURA

    IPC: E02F9/22 ,  F15B11/17 ,  F15B13/06 ,  E02F3/42

    CPC classification number: E02F9/2271 ,  E02F3/325 ,  E02F3/425 ,  E02F3/964 ,  E02F9/2235 ,  E02F9/2239 ,  E02F9/2267 ,  E02F9/2282 ,  E02F9/2285 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/163 ,  F15B11/165 ,  F15B11/17 ,  F15B13/06 ,  F15B2211/20546 ,  F15B2211/20576 ,  F15B2211/255 ,  F15B2211/30565 ,  F15B2211/3111 ,  F15B2211/3116

    Abstract: An object to achieve favorable operability, in a combined operation that involves a specific actuator and involves a great difference in load pressure and when an operation of an operating unit for the specific actuator is a fine operation, by reducing energy consumption arising from wasted restricting pressure loss of a pressure compensating valve and by flexibly varying a flow rate of a hydraulic fluid supplied to the specific actuator depending on the load pressure. To achieve this object, a boom cylinder (3a) is provided with an open center type flow control valve (6a) that controls a hydraulic fluid from a main pump (202) and a closed center type flow control valve (6i) that controls a hydraulic fluid from a main pump (102). The main pump (102) is subject to load sensing control. The flow control valve (6a) is opened to control a supply flow rate up to an intermediate zone of an operating range of an operating unit for the boom cylinder (3a). Both the flow control valves (6a) and (6i) are opened to control the supply flow rate after the intermediate zone.

    Abstract translation: 实现有利的可操作性的目的是，在涉及特定致动器的组合操作中并且涉及负载压力的巨大差异，并且当特定致动器的操作单元的操作是精细操作时，通过减少由浪费的限制压力引起的能量消耗 压力补偿阀的损失以及根据负载压力灵活地改变供给到特定致动器的液压流体的流量。 为了实现该目的，动臂油缸（3a）设置有开式中心型流量控制阀（6a），其控制来自主泵（202）的液压流体和控制中压式流量控制阀（6i）的闭合中心型流量控制阀 来自主泵（102）的液压流体。 主泵（102）经受负载感测控制。 流量控制阀（6a）被打开以控制供给流量直到动臂缸（3a）的操作单元的操作范围的中间区域。 打开流量控制阀（6a）和（6i）以控制中间区域之后的供给流量。

    HYDRAULIC DRIVE SYSTEM FOR CONSTRUCTION MACHINE
    4.
    发明申请
    HYDRAULIC DRIVE SYSTEM FOR CONSTRUCTION MACHINE 审中-公开
    液压驱动系统

    公开(公告)号：US20160333900A1

    公开(公告)日：2016-11-17

    申请号：US15030383

    申请日：2014-11-26

    Applicant: Hitachi Construction Machinery Co., Ltd.

    Inventor： Kiwamu TAKAHASHI ,  Yasutaka TSURUGA ,  Kazushige MORI ,  Yoshifumi TAKEBAYASHI ,  Natsuki NAKAMURA ,  Yasuharu OKAZAKI ,  Kenji YAMADA

    IPC: F15B13/06 ,  F15B11/16 ,  E02F9/22 ,  F15B11/17

    CPC classification number: F15B13/06 ,  E02F3/325 ,  E02F9/2235 ,  E02F9/2267 ,  E02F9/2292 ,  E02F9/2296 ,  F15B11/161 ,  F15B11/17 ,  F15B2211/20507 ,  F15B2211/20523 ,  F15B2211/20546 ,  F15B2211/20553 ,  F15B2211/20576 ,  F15B2211/253 ,  F15B2211/255 ,  F15B2211/2656 ,  F15B2211/50554 ,  F15B2211/6355 ,  F15B2211/67

    Abstract: The object is to make it possible to efficiently utilize rated output torque of the prime mover by performing total torque control with high precision through precise detection of absorption torque of the other hydraulic pump by use of a purely hydraulic structure and feedback of the absorption torque to the one hydraulic pump's side. For this purpose, the hydraulic drive system is equipped with: a torque feedback circuit 112v which is supplied with delivery pressure of a main pump 202 and load sensing drive pressure, modifies the delivery pressure of the main pump 202 to achieve a characteristic simulating the absorption torque of the main pump 202, and outputs the modified pressure; and a torque feedback piston 112f which is supplied with output pressure of the torque feedback circuit and controls displacement of a main pump 102 so as to decrease the displacement of the main pump 102 and thereby decrease maximum torque T12max as the output pressure increases. The torque feedback circuit 112v includes first and second variable pressure reducing valves 112g and 112q.

    Abstract translation: 目的是通过使用纯水力结构和吸收扭矩的反馈来精确地检测另一液压泵的吸收扭矩，通过高精度地执行总转矩控制来有效地利用原动机的额定输出转矩 一个液压泵的一侧。 为此，液压驱动系统配备有：被供应主泵202的输送压力和负载感测驱动压力的扭矩反馈电路112v，改变主泵202的输送压力，以实现模拟吸收的特性 主泵202的转矩，输出修正压力; 以及扭矩反馈活塞112f，其被提供有扭矩反馈回路的输出压力并控制主泵102的位移，以便减小主泵102的位移，从而随着输出压力的增加而减小最大转矩T12max。 扭矩反馈电路112v包括第一和第二可变减压阀112g和112q。

    Hydraulic Drive System for Construction Machine
    5.
    发明申请
    Hydraulic Drive System for Construction Machine 有权
    施工机械液压驱动系统

    公开(公告)号：US20150330415A1

    公开(公告)日：2015-11-19

    申请号：US14763000

    申请日：2013-11-15

    Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.

    Inventor： Kiwamu TAKAHASHI ,  Shingo KISHIMOTO ,  Yoshifumi TAKEBAYASHI ,  Kazushige MORI ,  Natsuki NAKAMURA

    IPC: F15B11/16 ,  F15B13/02

    CPC classification number: F15B11/165 ,  E02F9/2232 ,  E02F9/2253 ,  E02F9/2285 ,  E02F9/2296 ,  F15B11/163 ,  F15B11/168 ,  F15B13/026 ,  F15B2211/20553 ,  F15B2211/253 ,  F15B2211/30535 ,  F15B2211/329 ,  F15B2211/40515 ,  F15B2211/428 ,  F15B2211/50536 ,  F15B2211/6058 ,  F15B2211/6355 ,  F15B2211/67 ,  F15B2211/7135

    Abstract: An object of the invention is to achieve a travel speed known in the art during travelling operation, improve energy efficiency by reducing energy loss, and obtain favorable travel operability less susceptible to effects from variations in a travel load and changes in a pump delivery pressure when travelling operation is performed through operation of a travel lever over a half stroke range or less. A variable restrictor valve 80 is disposed in parallel with a flow sensing valve 50 of an engine speed sensing valve unit 13. A travel pilot pressure is adapted to act in an opening direction of the variable restrictor valve 80. The variable restrictor valve 80 is set to have a continuously increasing opening area from a full closure to a maximum with an increasing travel pilot pressure. Travel flow control valves 6d and 6e have an opening area that allows a predetermined flow rate QT required for traveling to be obtained even when a target LS differential pressure is decreased to a second specified value Pa3 when the travel lever is fully operated. In a first half of a spool stroke, the travel flow control valves 6d and 6e have an opening area approximate to an opening area of comparative example 1.

    Abstract translation: 本发明的一个目的是在行驶中实现本领域已知的移动速度，通过减少能量损失来提高能量效率，并获得较不易受行驶负载变化和泵输送压力变化影响的良好行驶操作性能 行驶操作通过行程杆在半冲程范围以下的操作来进行。 可变节流阀80与发动机速度检测阀单元13的流量检测阀50平行设置。行驶先导压力适于沿可变节流阀80的打开方向作用。可变节流阀80被设定 随着行驶先导压力的增加，开启面积从全封闭到不断增加。 行程流量控制阀6d和6e具有开口面积，即使当行程杆完全操作时目标LS差压降低到第二规定值Pa3时，也能够获得行驶所需的预定流量QT。 行程流量控制阀6d和6e在滑阀冲程的前半部分中具有与比较例1的开口面积近似的开口面积。

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