专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

21. 发明公开

EP3604827A1 WORKING MACHINE 有权
公开(公告)号：EP3604827A1
公开(公告)日：2020-02-05
申请号：EP17903524.1
申请日：2017-03-29
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： OGAWA, Yuichi , HIJIKATA, Seiji , HOSHINO, Masatoshi , TAKAHASHI, Kiwamu , ISHIKAWA, Kouji
IPC分类号： F15B21/14 , E02F9/22
摘要： 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.

22. 发明公开

EP3480371A1 WORK MACHINE 有权
公开(公告)号：EP3480371A1
公开(公告)日：2019-05-08
申请号：EP17819546.7
申请日：2017-02-28
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： IZUMI, Shiho , NARIKAWA, Ryuu , ISHIKAWA, Kouji , SAKAI, Daito , KUROSE, Takahiko
IPC分类号： E02F3/43 , E02F9/20 , E02F9/26
摘要： Provided is a work machine that is equipped with a control unit (9) that executes area limiting control with respect to a work device (1A). The control unit (9) includes: a position computing section (21) that calculates the position, on an operation plane, of the forward end (first reference point (P1)) of a bucket (1c) and the rear end (second reference point (Q1)) of the bucket (1c); and a first distance computing section (22) that calculates the distances (PC1, QC1) in the operating plane from the first reference point (P1) and the second reference point (Q1) to the target face A to be controlled. When the smaller one of the two distances (PC1, QC1) is equal to or lower than a threshold (T1) during area limiting control, the control unit (9) corrects an operation signal output from an operation lever device (4) so as to reduce the operating speed of a hydraulic actuator (3b) that is an control target of the operation signal.

23. 发明公开

EP3306114A1 WORK MACHINE HYDRAULIC ENERGY REUSING DEVICE 有权
标题翻译：工作机液压能量再利用装置
公开(公告)号：EP3306114A1
公开(公告)日：2018-04-11
申请号：EP16802854.6
申请日：2016-02-23
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： HIJIKATA, Seiji , ISHIKAWA, Kouji , IMURA, Shinya
IPC分类号： F15B21/14 , E02F9/22 , F15B11/00 , F15B11/08 , F15B11/16 , F15B20/00
CPC分类号： E02F9/2217 , B60Y2200/412 , E02F9/2095 , E02F9/2225 , E02F9/2235 , E02F9/2271 , E02F9/2285 , E02F9/2292 , E02F9/2296 , E02F9/268 , F15B11/024 , F15B11/17 , F15B21/14 , F15B2211/20576 , F15B2211/3059 , F15B2211/30595 , F15B2211/3157 , F15B2211/353 , F15B2211/6313 , F15B2211/6316 , F15B2211/7142 , F15B2211/88
摘要： A hydraulic fluid energy regeneration system for a work machine capable of securely maintaining a brake pressure even when a solenoid valve or the like is erroneously rendered open by an electrical failure is provided. The hydraulic fluid energy regeneration system for a work machine, including a first hydraulic actuator; a second hydraulic actuator; and a first hydraulic pump that supplies a hydraulic fluid to the first hydraulic actuator via a first hydraulic line, includes: an upper control valve that is connected to a discharge side on which the hydraulic fluid is discharged from the second hydraulic actuator when an object to be driven by the second hydraulic actuator falls under its own weight, and that can regulate a flow rate of the hydraulic fluid discharged from the second hydraulic actuator; a communication hydraulic line that connects the upper control valve to a hydraulic fluid tank; a lower control valve that is provided in the communication hydraulic line and that can regulate a flow rate of the hydraulic fluid discharged from the upper control valve to the hydraulic fluid tank; and a regeneration hydraulic line that has one end side connected to a branch section between the upper control valve and the lower control valve in the communication hydraulic line and that has an other end side connected to the first hydraulic line.
摘要翻译：本发明提供一种作业机械的液压流体能量再生系统，即使在由于电气故障而误将电磁阀等打开的情况下，也能够可靠地保持制动压力。用于作业机械的液压流体能量再生系统，包括第一液压致动器; 第二液压致动器; 以及经由第一液压管线向所述第一液压致动器供应液压流体的第一液压泵，所述第一液压泵包括：上部控制阀，所述上部控制阀连接至排放侧，在所述排放侧，所述液压流体从所述第二液压致动器排出，由第二液压致动器驱动的第一液压致动器因其自重而下落，并且能够调节从第二液压致动器排出的液压流体的流量; 通信液压管路，其将上部控制阀连接到液压油箱; 下部控制阀，其设置在所述连通油路中，能够调整从所述上部控制阀向所述工作油箱排出的所述工作油的流量; 以及再生液压管线，其一端侧与上述连通油路内的上述上部控制阀与上述下部控制阀之间的分支部连接，另一端侧与上述第一油路连接。

24. 发明公开

EP3203087A1 WORK VEHICLE HYDRAULIC DRIVE SYSTEM 有权
标题翻译：工作车液压驱动系统
公开(公告)号：EP3203087A1
公开(公告)日：2017-08-09
申请号：EP14902957.1
申请日：2014-10-02
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： HIJIKATA, Seiji , ISHIKAWA, Kouji , OOKI, Takatoshi , IMURA, Shinya
IPC分类号： F15B21/14 , E02F9/22
CPC分类号： E02F3/425 , E02F3/32 , E02F9/22 , E02F9/2217 , E02F9/2225 , E02F9/2271 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F15B11/16 , F15B21/14 , F15B2211/20546 , F15B2211/46 , F15B2211/6313 , F15B2211/6326 , F15B2211/6336 , F15B2211/6346 , F15B2211/7053 , F15B2211/71 , F15B2211/88
摘要： When hydraulic fluid discharged from a hydraulic actuator is to be recovered for driving a different hydraulic actuator, the recovery frequency is increased to achieve further energy saving. To this end, a pressure increasing circuit 36 is provided in which a communication pressure increasing valve 12 is disposed in a communication passage 26 that connects a bottom side line 23 of and a rod side line 24 a boom cylinder 4. A recovery control valve 11 is controlled such that, when a first operation unit 5 is operated in a boom lowering direction (own weight falling direction of the boom) and a second operation unit 6 is operated simultaneously, only if the pressure at the bottom side of the boom cylinder 4 is higher than the pressure at the arm cylinder side that is a recovery destination of hydraulic fluid, the recovery control valve 11 is opened to recover the flow rate discharged from the bottom side of the boom cylinder 4 to the arm cylinder side.
摘要翻译：当从液压致动器排出的液压流体被回收用于驱动不同的液压致动器时，回收频率增加以实现进一步的节能。为此设置增压回路36，其中连通增压阀12布置在连接通道26和连杆侧线24的连通通道26中，所述连通通道26连接到动臂缸4的杆侧线24和回收控制阀11 当第一操作单元5在动臂下降方向（动臂的自重下降方向）上被操作并且第二操作单元6被同时操作时，只有当动臂油缸4的底侧处的压力比作为工作油的回收目标的斗杆油缸侧的压力高时，恢复控制阀11打开，恢复从动臂油缸4的底侧向斗杆油缸侧排出的流量。

25. 发明公开

EP2963191A1 HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINERY 有权
标题翻译：液压系统FÜREINE BAUMASCHINE
公开(公告)号：EP2963191A1
公开(公告)日：2016-01-06
申请号：EP15174221.0
申请日：2015-06-29
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： OOKI, Takatoshi , HIJIKATA, Seiji , ISHIKAWA, Kouji
IPC分类号： E02F9/20 , E02F9/22 , E02F9/26 , F15B21/14
摘要： Provided is a hydraulic system for a construction machinery capable of suppressing irregularity in the operation of the front structure not intended by the operator. The hydraulic system comprises: a regeneration motor 55 adapted to be driven by return fluid from a bottom port of a boom cylinder; a regeneration electric motor 54 adapted to convert rotary power of the regeneration motor into electric energy; return fluid control valves adapted to control the flow of the return fluid according to pilot pressure that is led from the pilot hydraulic pressure source 45 in conjunction with an operation on a boom control lever; solenoid valves for return fluid control valve adapted to control the pilot pressures for driving the return fluid control valves; and a malfunction prevention device adapted to be activated by pressure fluctuation caused by malfunction of a solenoid valve for return fluid control valve, for example, and interrupts the delivery of the pilot secondary pressure from the solenoid valve for return fluid control valve to the corresponding return fluid control valve.
摘要翻译：提供一种用于能够抑制操作者不希望的前部结构的操作的不规则性的工程机械的液压系统。液压系统包括：再生电动机55，其适于由来自动臂缸的底部端口的返回流体驱动; 适于将再生电动机的旋转动力转换为电能的再生电动机54; 返回流体控制阀，其适于根据从先导液压源45引导的先导压力结合在动臂控制杆上的操作来控制返回流体的流量; 用于返回流体控制阀的电磁阀，其适于控制用于驱动回流控制阀的先导压力; 以及故障防止装置，其例如适用于由于用于返回流体控制阀的电磁阀的故障引起的压力波动而被启动，并且中断从用于返回流体控制阀的电磁阀到相应回程的先导二次压力的传送流体控制阀。

26. 发明公开

EP1637718A1 ENGINE CONTROL DEVICE FOR CONSTRUCTION MACHINE 失效转让
标题翻译： MOTORSTEUERVORRICHTUNGFÜRBAUMASCHINE
公开(公告)号：EP1637718A1
公开(公告)日：2006-03-22
申请号：EP04746748.5
申请日：2004-06-24
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： NAKAMURA, Kazunori , ARAI, Yasushi , KOWATARI, Yoichi , ISHIKAWA, Kouji , KARASAWA, Hideo
IPC分类号： F02D41/04 , F02D41/14
CPC分类号： F02D31/007 , F02D41/12
摘要： An engine control system includes pressure sensors (73, 74), position sensors (75, 76), pressure sensors (77, 78), a target revolution speed modification value computing unit (90), and a modification value adder (70r). A target revolution speed NR2 for use in control is computed based on changes of status variables such that the target revolution speed NR2 increases from the target revolution speed NR1 applied from an input unit (71), and then moderately returns to the target revolution speed NR1. In accordance with the computed target revolution speed NR2 for use in control, a target fuel injection amount FN1 is computed and a fuel injection amount is controlled. As a result, a drop of an engine revolution speed attributable to an abrupt increase of an engine load can be suppressed without sacrificing the work efficiency, and lowering of durability caused by an excessive increase of the engine revolution speed can be prevented.
摘要翻译：发动机控制系统包括压力传感器（73,74），位置传感器（75,76），压力传感器（77,78），目标转速修正值计算单元（90）和修正值加法器（70r）。根据状态变量的变化，计算目标转速NR2，使得目标转速NR2从从输入单元（71）施加的目标转速NR1增加，然后适度地返回到目标转速NR1 。根据用于控制的计算出的目标转速NR2，计算出目标燃料喷射量FN1，控制燃料喷射量。结果，可以在不牺牲工作效率的情况下抑制归因于发动机负载突然增加的发动机转速的下降，并且可以防止由于发动机转速过大而引起的耐久性降低。

27. 发明授权

EP2963191B1 HYDRAULIC SYSTEM FOR CONSTRUCTION MACHINERY 有权
公开(公告)号：EP2963191B1
公开(公告)日：2020-11-11
申请号：EP15174221.0
申请日：2015-06-29
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： OOKI, Takatoshi , HIJIKATA, Seiji , ISHIKAWA, Kouji
IPC分类号： E02F9/20 , E02F9/22 , E02F9/26 , F15B21/14

28. 发明授权

EP3273072B1 CONSTRUCTION APPARATUS 有权
公开(公告)号：EP3273072B1
公开(公告)日：2019-11-27
申请号：EP15885381.2
申请日：2015-03-16
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： HIJIKATA, Seiji , ISHIKAWA, Kouji , TSURUGA, Yasutaka , HOSHINO, Masatoshi , TAKAHASHI, Kiwamu
IPC分类号： F15B21/14 , F15B11/08 , E02F9/22

29. 发明公开

EP3517789A1 HYDRAULIC ENERGY RECOVERY DEVICE FOR WORK MACHINE 有权
公开(公告)号：EP3517789A1
公开(公告)日：2019-07-31
申请号：EP16913636.3
申请日：2016-09-23
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： HIJIKATA, Seiji , ISHIKAWA, Kouji , IMURA, Shinya
IPC分类号： F15B21/14 , E02F9/22 , F15B11/00 , F15B11/024
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.

30. 发明公开

EP3483348A1 WORK MACHINE 有权
公开(公告)号：EP3483348A1
公开(公告)日：2019-05-15
申请号：EP17823797.0
申请日：2017-02-28
申请人： Hitachi Construction Machinery Co., Ltd
发明人： IZUMI, Shiho , MEGURIYA, Shuuichi , NARIKAWA, Ryuu , ISHIKAWA, Kouji , AKITA, Tarou
IPC分类号： E02F9/20 , E02F3/43 , F02D29/02 , F02D29/04
摘要： A work machine (1) having a controller (40) that can perform area limiting control, the work machine further includes a machine control ON/OFF switch (17) that alternatively selects an ON position permitting execution of the area limiting control and an OFF position prohibiting execution of the area limiting control. The controller (40) has an engine control section (63) that performs automatic idling control when a predetermined period of time (T1) has elapsed after a point in time when all of operation levers (1, 23) have attained a neutral state. The engine control section (63) is configured to execute the automatic idling control during when the switch (17) is in the OFF position and not to execute the automatic idling control during when the switch (17) is in the ON position.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式