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21. 发明授权

US10066368B2 Hydraulic fluid energy recovery apparatus for work machine 有权
公开(公告)号：US10066368B2
公开(公告)日：2018-09-04
申请号：US14761384
申请日：2014-01-16
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： Seiji Hijikata , Hidetoshi Satake , Shinya Imura , Shinji Nishikawa
IPC分类号： F15B11/024 , E02F9/22 , F15B11/08 , F15B21/14 , E02F9/20
摘要： The hydraulic fluid energy recovery apparatus includes a fluid communication line for holding a bottom-side hydraulic fluid chamber and a rod-side hydraulic fluid chamber of a hydraulic cylinder in fluid communication with each other, a fluid communication valve connected to the fluid communication line for adjusting the pressure and/or flow rate of a hydraulic fluid passing through the fluid communication line in a manner that allows for adjustment of a degree of opening of the fluid communication valve, first pressure detecting means for detecting a signal indicative of pressure at the bottom-side hydraulic fluid chamber of the hydraulic cylinder, an amount-of-operation detecting means for detecting an amount of operation of the operating means, and a control device for capturing the signal of pressure at the bottom-side hydraulic fluid chamber of the hydraulic cylinder detected by the first pressure detecting means.

22. 发明申请

US20150247305A1 CONSTRUCTION MACHINERY 有权
标题翻译：建筑机械
公开(公告)号：US20150247305A1
公开(公告)日：2015-09-03
申请号：US14377580
申请日：2013-02-05
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： Shinya Imura , Hidetoshi Satake , Kouji Ishikawa , Seiji Hijikata , Tomoaki Kaneta
IPC分类号： E02F9/22 , F15B11/024 , F15B15/14 , E02F9/20
CPC分类号： E02F9/2292 , E02F9/2075 , E02F9/2095 , E02F9/2217 , E02F9/2242 , E02F9/2296 , F15B11/024 , F15B15/14 , F15B21/14 , F15B2211/20515 , F15B2211/2053 , F15B2211/20546 , F15B2211/20569 , F15B2211/20576 , F15B2211/31558 , F15B2211/41518 , F15B2211/88
摘要： Provided is construction machinery that is capable of greatly reducing the amount of fuel consumption by making effective use of recovered energy. The construction machinery has a first hydraulic pump 3 for discharging hydraulic oil for driving an actuator 6, a second hydraulic pump 9, a second prime mover 7 for driving the second hydraulic pump 9, energy storage device 8 for storing energy for driving the second prime mover 7, and a hydraulic oil supply circuit 10 including a hydraulic oil switching section 11c that accepts the hydraulic oil discharged from the first hydraulic pump and the hydraulic oil discharged from the second hydraulic pump and supplies either the mixture of the accepted hydraulic oils or a selected one of the accepted hydraulic oils to the actuator 6. The construction machinery includes a control device 20 that, when the drive efficiency of the second hydraulic pump 9 and/or the amount of energy stored in the energy storage device 8 is higher than a preselected setting value, outputs a switch command to the hydraulic oil switching section 11c and outputs a drive command to the second prime mover 7.
摘要翻译：提供能够通过有效利用回收能量大大减少燃料消耗量的工程机械。施工机械具有用于排出用于驱动致动器6的液压油的第一液压泵3，用于驱动第二液压泵9的第二液压泵9，第二原动机7，用于存储用于驱动第二主泵的能量的储能装置8 动力装置7和液压油供给回路10，其具备：液压油切换部11c，其接受从第一液压泵排出的液压油和从第二液压泵排出的液压油，并将所接收的液压油或所选择的可接受的液压油中的一个被提供给致动器6.工程机械包括控制装置20，当第二液压泵9的驱动效率和/或存储在能量存储装置8中的能量的量高于将选择的设定值输出到液压油切换部11c，并向第2原动机7输出驱动指令。

23. 发明授权

US12043983B2 Construction machine 有权
公开(公告)号：US12043983B2
公开(公告)日：2024-07-23
申请号：US17908040
申请日：2021-04-07
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Seiji Hijikata , Yasutaka Tsuruga , Kenji Hiraku , Masatoshi Hoshino
IPC分类号： E02F9/22 , E02F9/20 , E02F9/26 , F15B1/04 , F15B11/024 , F15B13/06 , F15B21/14 , E02F3/32
CPC分类号： E02F9/2228 , E02F9/2004 , E02F9/2217 , E02F9/2235 , E02F9/2267 , E02F9/2271 , E02F9/2275 , E02F9/2296 , E02F9/26 , F15B1/04 , F15B11/024 , F15B13/06 , F15B21/14 , E02F3/32 , E02F9/2292 , F15B2211/6306 , F15B2211/6654
摘要： An object of the present invention is to provide a construction machine that can use the return oil from a hydraulic actuator effectively. For this purpose, a controller computes a flow rate of the return oil from a first hydraulic actuator on the basis of an operation signal from a first operation device, computes a flow rate of oil to be supplied to a second hydraulic actuator on the basis of an operation signal from a second operation device, sets smaller one of the flow rate of the return oil and the flow rate of the oil to be supplied, as a regeneration flow rate that is a flow rate of oil to be regenerated in the second hydraulic actuator, sets a flow rate obtained by subtracting the regeneration flow rate from the flow rate of the return oil, as a recovery flow rate that is a flow rate of oil to be recovered to a pressure accumulating device, adjusts an opening degree of a first control valve 2 such that a flow rate of oil supplied from the first hydraulic actuator to the pressure accumulating device coincides with the recovery flow rate, and adjusts an opening degree of a second control valve such that a flow rate of oil supplied from the first hydraulic actuator to the second hydraulic actuator coincides with the regeneration flow rate.

24. 发明授权

US12018458B2 Construction machine 有权
公开(公告)号：US12018458B2
公开(公告)日：2024-06-25
申请号：US17802745
申请日：2021-04-07
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Seiji Hijikata , Yasutaka Tsuruga , Kenji Hiraku , Masatoshi Hoshino
IPC分类号： E02F9/22 , F15B11/028 , F15B11/08
CPC分类号： E02F9/2217 , E02F9/2221 , E02F9/2285 , F15B11/028 , F15B11/08 , B60Y2200/412
摘要： It is an object of the present invention to provide a construction machine capable of efficiently driving a hydraulic cylinder by an accumulator. Thus, the construction machine includes a first control valve disposed in a first hydraulic fluid line connecting a bottom-side fluid chamber of a hydraulic cylinder with an accumulator, and a second control valve disposed in a second hydraulic fluid line connecting a rod-side fluid chamber of the hydraulic cylinder with a tank. The construction machine further includes a third control valve disposed in a third hydraulic fluid line connecting the rod-side fluid chamber with the accumulator, and a fourth control valve disposed in a fourth hydraulic fluid line connecting a line part of the first hydraulic fluid line, which connects the bottom-side fluid chamber with the third control valve, and a line part of the third hydraulic fluid line, which connects the rod-side fluid chamber with the third control valve, with each other.

25. 发明授权

US11946226B2 Work machine 有权
公开(公告)号：US11946226B2
公开(公告)日：2024-04-02
申请号：US18023784
申请日：2021-12-17
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Masatoshi Hoshino , Seiji Hijikata , Yasutaka Tsuruga , Ryou Yagisawa , Shou Furukawa
IPC分类号： E02F9/22 , F15B11/16
CPC分类号： E02F9/2235 , E02F9/2246 , E02F9/2296 , F15B11/165 , F15B2211/2658 , F15B2211/275 , F15B2211/633 , F15B2211/6651 , F15B2211/6652
摘要： Provided is a work machine capable of achieving both low fuel consumption and ensuring of workability. The work machine is configured to, in a state where an output of an engine or hydraulic pump has increased to an increase threshold (S12: Yes) with the rotational speed being at a first rotational speed (S11: Yes), raise the rotational speed from the first rotational speed to a second rotational speed (S13); in a process of raising the rotational speed to the second rotational speed, output, to a regulator, a signal instructing reduction in the discharge rate (S14) so as to keep the output of the engine or hydraulic pump constant; and after the rotational speed has reached the second rotational speed, output, to the regulator, a signal instructing increase in the discharge rate (S16) so as to make the output of the engine or hydraulic pump have a value corresponding to a request load.

26. 发明授权

US10995475B2 Construction machine 有权
公开(公告)号：US10995475B2
公开(公告)日：2021-05-04
申请号：US16491264
申请日：2018-05-18
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Seiji Hijikata , Yasutaka Tsuruga , Kouji Ishikawa , Kiwamu Takahashi , Masatoshi Hoshino
IPC分类号： E02F9/22 , F15B11/08 , F15B21/14
摘要： 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).

27. 发明授权

US10787790B2 Work machine 有权
公开(公告)号：US10787790B2
公开(公告)日：2020-09-29
申请号：US15754693
申请日：2016-09-15
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Shinya Imura , Seiji Hijikata
IPC分类号： E02F9/22 , F15B21/08 , E02F9/26 , F15B11/024 , F15B21/14 , E02F9/20
摘要： Regeneration control is exercised and energy saving is realized even when an abnormality occurs to pressure sensors for hydraulic actuators. A work machine includes: a hydraulic pump (41b) that supplies a hydraulic fluid to a second hydraulic actuator (34); a regeneration circuit (47) that regenerates a return hydraulic fluid from a first hydraulic actuator (32) between the second hydraulic actuator (41b) and the hydraulic pump (41b); a discharge circuit (46) that discharges the return hydraulic fluid from the first hydraulic actuator (32) to a tank; a regeneration amount regulation device (45) that regulates a proportion of a flow rate of the return hydraulic fluid flowing to the regeneration circuit (47) and a flow rate of the return hydraulic fluid flowing to the discharge circuit (46); a controller (100) that controls the regeneration amount regulation device (45); a first operation amount sensor (53a) that detects an operation amount of the first operation device (51); and a first hydraulic actuator speed computing unit (111) that computes a speed of the first hydraulic actuator (32). The controller (111) controls the regeneration amount regulation device on the basis of the operation amount detected by the first operation amount sensor (53a) and the speed computed by the first hydraulic actuator speed computing unit (111).

28. 发明授权

US10526768B2 Hydraulic energy regeneration system for work machine 有权
公开(公告)号：US10526768B2
公开(公告)日：2020-01-07
申请号：US15755964
申请日：2016-09-23
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Seiji Hijikata , Kouji Ishikawa , Shinya Imura
IPC分类号： E02F9/22 , F15B11/16 , F15B1/02 , F15B1/027 , F15B11/024 , E02F9/26 , F15B21/14
摘要： A hydraulic energy regeneration system for a work machine for boosting a pressure of a return hydraulic fluid of a hydraulic cylinder and regenerating the hydraulic fluid, prevents a bottom pressure from reaching an overload relief set pressure and suppresses a changeover shock to ensure favorable operability.The hydraulic energy regeneration system for the work machine, includes: a communication pressure boost passage that can boost a pressure of a discharge-side hydraulic fluid by communicating a discharge side and a suction side of the hydraulic cylinder with each other during an own weight fall of a driven body; a communication pressure boost valve that is disposed in the communication pressure boost passage and that can regulate one of or both of a pressure and a flow rate of the communication pressure boost passage; a reuse-side line and a reuse control valve or a regeneration-side line and a regeneration control valve that can regenerate a hydraulic fluid discharged from the hydraulic cylinder during the own weight fall of the driven body; and a controller. The controller is configured to reduce an opening degree of the communication pressure boost valve in response to an increase of the discharge-side pressure of the hydraulic cylinder right after the discharge-side pressure reaches a preset high load set pressure, and gradually reduces the opening degree of the communication pressure boost valve with passage of time.

29. 发明授权

US10280593B2 Hydraulic fluid energy regeneration device for work machine 有权
公开(公告)号：US10280593B2
公开(公告)日：2019-05-07
申请号：US15120545
申请日：2014-05-16
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Seiji Hijikata , Kouji Ishikawa , Takatoshi Ooki , Shinya Imura
IPC分类号： F15B21/14 , E02F9/22 , F15B11/16 , F15B13/06 , F15B21/08 , E02F9/20 , F04B49/00 , E02F3/32
摘要： Provided is a hydraulic fluid energy regeneration device for a work machine, including: a regeneration hydraulic motor driven by discharged return hydraulic fluid; a first hydraulic pump mechanically connected to the regeneration hydraulic motor; a second hydraulic pump that delivers an hydraulic fluid for driving a first hydraulic actuator and/or a second hydraulic actuator; a junction line that allows the hydraulic fluid delivered by the second hydraulic pump to be joined; a second regulator that regulates the delivery flow rate of the second hydraulic pump; and a first regulator that regulates the flow rate of the hydraulic fluid coming from the first hydraulic pump and flowing through the junction line. A control unit includes: a first computing part that calculates a demanded pump flow rate in accordance with the input target replacement command for the second hydraulic pump, the first computing part further outputting a control command to the first regulator in such a manner that the flow rate of the hydraulic fluid coming from the first hydraulic pump and flowing through the junction line equals to or lower than the demanded pump flow rate; and a second computing part that subtracts from the demanded pump flow rate the flow rate of the hydraulic fluid coming from the first hydraulic pump to obtain a target pump flow rate, the second computing part further outputting a control command to the second regulator in such a manner that the calculated target pump flow rate is attained.

30. 发明授权

US10273658B2 Construction machine 有权
公开(公告)号：US10273658B2
公开(公告)日：2019-04-30
申请号：US15506894
申请日：2015-03-16
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： Seiji Hijikata , Kouji Ishikawa , Yasutaka Tsuruga , Masatoshi Hoshino , Kiwamu Takahashi
IPC分类号： F16D31/02 , E02F9/22 , F15B1/02 , F15B13/043 , F15B21/14 , F15B13/042 , E02F9/20
摘要： The construction machine includes: a control valve that switchingly supplies hydraulic fluid from a hydraulic pump to a hydraulic actuator; a control valve drive device that supplies pilot secondary hydraulic fluid to the control valve in accordance with an operation of an operation lever device; a pilot hydraulic pump that supplies pilot primary hydraulic fluid to the control valve drive device; a pressure accumulation device that recovers return hydraulic fluid returned from the hydraulic actuator. The construction machine further includes: a check valve provided in a line between the pilot hydraulic pump and the control valve drive device; a pressure reducing valve that supplied the hydraulic fluid accumulated in the pressure accumulation device; a flow rate reduction device; and a controller that controls the flow rate reduction device in accordance with the pressure in the line between the check valve and the control valve drive device.

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