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公开(公告)号：US20180106018A1
公开(公告)日：2018-04-19
申请号：US15555685
申请日：2016-03-11
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Masatoshi HOSHINO , Yasutaka TSURUGA , Kiwamu TAKAHASHI , Seiji HIJIKATA
CPC classification number: E02F9/2235 , E02F3/32 , E02F9/2225 , E02F9/2246 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F02D29/04 , F02D2200/101 , F02D2200/50 , F15B11/10 , F15B11/166 , F15B2211/20523 , F15B2211/20553 , F15B2211/30 , F15B2211/329 , F15B2211/355 , F15B2211/633 , F15B2211/6336 , F15B2211/6355 , F15B2211/6652 , F15B2211/7053 , F15B2211/851 , F16H61/475
Abstract: The invention provides a construction machine in which the load torque at the time of engine start-up can be reduced even when the engine stops against the will of the operator. A hydraulic excavator includes a control device (35) having a pump displacement control section (37) and an unload control section (38). The pump displacement control section (37) makes the displacement of a hydraulic pump (16) variable to a minimum displacement by controlling a regulator device (20) when the speed of an engine (14) detected by a speed sensor (41) becomes equal to or less than a preset low speed N3 at the time of driving of the engine (14). The unload control section (40) controls an unloading valve (24) to the open position at the time of start-up of the engine (14).
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公开(公告)号：US20210340731A1
公开(公告)日：2021-11-04
申请号：US16330407
申请日：2017-09-08
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Kiwamu TAKAHASHI , Kouji ISHIKAWA , Yasutaka TSURUGA , Masatoshi HOSHINO , Seiji HIJIKATA
IPC: E02F9/22
Abstract: A first torque control proportional electromagnetic valve (37) is connected through a first torque control line (41) to a third pressure receiving chamber (32D) in a first torque control regulator (32). A second torque control proportional electromagnetic valve (38) is connected through a second torque control line (42) to a third pressure receiving chamber (35D) in a second torque control regulator (35). The first and second torque control proportional electromagnetic valves (37, 38) are controlled by a controller 47. A switching valve (48) is provided between the first torque control line (41) and the second torque control line (42). The switching valve (48) supplies an output pressure of the first torque control proportional electromagnetic valve (37) to the third pressure receiving chamber (35D) in the second torque control regulator (35) at the time of driving hydraulic motors (2B, 2C) for left side and right side traveling.
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公开(公告)号：US20190186106A1
公开(公告)日：2019-06-20
申请号：US16327928
申请日：2017-03-29
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Yuichi OGAWA , Seiji HIJIKATA , Masatoshi HOSHINO , Kiwamu TAKAHASHI , Kouji ISHIKAWA
Abstract: 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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公开(公告)号：US20180087243A1
公开(公告)日：2018-03-29
申请号：US15447836
申请日：2017-03-02
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Masamichi ITO , Takatoshi OOKI , Kiwamu TAKAHASHI
CPC classification number: E02F9/2225 , E02F3/32 , E02F9/22 , E02F9/2217 , E02F9/2232 , E02F9/2267 , E02F9/2271 , E02F9/2285 , E02F9/2296 , F15B1/027 , F15B1/04 , F15B11/024 , F15B11/08 , F15B13/026 , F15B13/0401 , F15B21/14 , F15B2211/20546 , F15B2211/212 , F15B2211/30535 , F15B2211/3111 , F15B2211/3133 , F15B2211/40561 , F15B2211/40569 , F15B2211/41554 , F15B2211/465 , F15B2211/50545 , F15B2211/50581 , F15B2211/57 , F15B2211/7053 , F15B2211/7128 , F15B2211/761 , F15B2211/88
Abstract: To keep operability of a hydraulic actuator excellent even in a state pressure has been sufficiently accumulated in a pressure accumulator. In a hydraulic driving device of a work machine including a hydraulic actuator, a tank, a flow control valve, and a pressure accumulator, there are further provided with a first pressure compensation valve that is for controlling difference between front and back pressures of the flow control valve constant and a second pressure compensation valve that is arranged between the pressure accumulator and the tank and is for controlling difference between front and back pressures of the flow control valve and the first pressure compensation valve constant.
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公开(公告)号：US20200032485A1
公开(公告)日：2020-01-30
申请号：US16491264
申请日：2018-05-18
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Seiji HIJIKATA , Yasutaka TSURUGA , Kouji ISHIKAWA , Kiwamu TAKAHASHI , Masatoshi HOSHINO
Abstract: A hydraulic circuit (11) of a hydraulic excavator (1) is provided with a main hydraulic circuit (11A) including a boom cylinder (5D), a pilot hydraulic circuit (11B) for operating the boom cylinder (5D) and a recovery hydraulic circuit (11C) including an accumulator (29). In this case, the recovery hydraulic circuit (11C) is provided with a recovery control valve (31) that recovers pressurized oil discharged from the boom cylinder (5D) to the accumulator (29), a main supply control valve (34) for supplying pressurized oil accumulated in the accumulator (29) to the main hydraulic circuit (11A) and a pilot supply control valve (37) for supplying pressurized oil accumulated in the accumulator (29) to the pilot hydraulic circuit (11B).
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Patent Agency Ranking
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
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。
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公开(公告)号：US20210131452A1
公开(公告)日：2021-05-06
申请号：US16492368
申请日：2018-05-18
Applicant: Hitachi Construction Machinery Co., Ltd.
Inventor： Kiwamu TAKAHASHI , Seiji HIJIKATA , Masatoshi HOSHINO , Yuichi OGAWA , Kouji ISHIKAWA
Abstract: A controller (45) is provided with an elapse time measuring section (47A) that measures an elapse time (tx) elapsed since an initial use of an accumulator (29) based upon a reset signal from a reset switch (44), a number-of-operations measuring section (47B) that measures a number of operations of the accumulator (29), that is, a number (N) of boom lowering operations after a reset, based upon a detection signal from an accumulator side pressure sensor (39), a gas permeation amount estimating section (47C) that estimates an estimation gas permeation amount (Qloss) of the accumulator (29), a sealed gas pressure estimating section (47D) that finds an estimation sealed gas pressure (Pgs) of a gas chamber (29B) of the accumulator (29), and an accumulator degradation determining section (47E) that determines a degradation condition of the accumulator (29) and outputs the determination result.
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公开(公告)号：US20170089038A1
公开(公告)日：2017-03-30
申请号：US15376863
申请日：2016-12-13
Applicant: HITACHI CONSTRUCTION MACHINERY CO., LTD.
Inventor： Kiwamu TAKAHASHI , Shingo KISHIMOTO , Yoshifumi TAKEBAYASHI , Kazushige MORI , Natsuki NAKAMURA
CPC classification number: E02F9/207 , E02F3/325 , E02F3/964 , E02F9/2095 , E02F9/2235 , E02F9/2296 , F04B35/04 , F15B11/16 , F15B11/165 , F15B13/06 , F15B2211/20515 , F15B2211/20538 , F15B2211/20546 , F15B2211/255 , F15B2211/30555 , F15B2211/6055 , F15B2211/6309 , F15B2211/6313 , F15B2211/6651 , F15B2211/6652 , F15B2211/71 , F15B2211/76
Abstract: An electrically-operated hydraulic work machine drives an actuator with a hydraulic pump driven by an electric motor and exercises load sensing control by controlling the rotation speed of the electric motor. The useful life of an electrical storage device, which is an electrical power source for the electric motor, is increased by suppressing the horsepower consumption of the hydraulic pump. This prolongs the operating time of the electrically-operated hydraulic work machine, and reduces the size of the electric motor. A controller exercises load sensing control over a variable displacement main pump by controlling the rotation speed of the electric motor, and provides the main pump with a torque control device that reduces the delivery rate of the main pump when the delivery pressure of the main pump increases, or provides the controller with a control algorithm that performs the same function as the torque control device.
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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
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。
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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
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。
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