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1. 发明公开

EP2977620A1 HYDRAULIC DRIVE DEVICE OF CONSTRUCTION MACHINE 有权转让
标题翻译：液压传动装置
公开(公告)号：EP2977620A1
公开(公告)日：2016-01-27
申请号：EP14768311.4
申请日：2014-03-17
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： TAKAHASHI Kiwamu , TSURUGA Yasutaka , TAKEBAYASHI Yoshifumi , MORI Kazushige , NAKAMURA Natsuki
IPC分类号： F15B11/02 , E02F9/22 , F15B11/00 , F15B11/05 , F15B11/17
CPC分类号： 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
摘要： 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 driven 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.
摘要翻译：除了具有两个输出口102a和102b并执行负载感测控制的主泵102之外，还设置了用于分别对悬臂液压缸3a和悬臂液压缸3b进行辅助驱动的负载感测控制的两个辅助泵202和302。当驱动动臂油缸3a或斗杆油缸3b时，选择阀141或241被切换，并且液压油的流动汇合在一起并被供给到动臂油缸3a或斗杆油缸3b。当驱动除动臂油缸3a或斗杆油缸3b以外的致动器时，只有来自主泵的液压油供给致动器。简言之，液压驱动系统被构造成使得具有较高的需求流量并且当同时被驱动时倾向于具有彼此之间的较大负载压力差的两个特定致动器可以利用从分开的输送端口输送的液压流体来驱动。由此，能够抑制压力补偿阀的压力损失造成的浪费的能量消耗，在驱动低要求流量的致动器的情况下，能够在容积效率高的点使用液压泵。

2. 发明公开

EP2636906A1 HYDRAULIC DRIVE SYSTEM ADAPTED FOR USE IN CONSTRUCTION MACHINE AND PROVIDED WITH EXHAUST GAS PURIFICATION DEVICE 有权转让
标题翻译：水ES ES BS INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE INE
公开(公告)号：EP2636906A1
公开(公告)日：2013-09-11
申请号：EP11837948.6
申请日：2011-10-28
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： TAKAHASHI Kiwamu , TSURUGA Yasutaka , YOSHIDA Hajime , TAKEBAYASHI Yoshifumi , MORI Kazushige
IPC分类号： F15B11/00 , E02F9/00 , E02F9/22 , F01N3/023 , F02D29/00 , F02D29/04
CPC分类号： F01N9/002 , E02F9/2235 , E02F9/2285 , E02F9/2296 , F01N3/023 , F01N2590/08 , F02D29/04 , F04B49/002 , F15B11/165 , F15B2211/20523 , F15B2211/20553 , F15B2211/6057 , F15B2211/6058 , F15B2211/633 , F15B2211/653 , F15B2211/665 , F15B2211/6652 , F15B2211/6658
摘要： A hydraulic drive system executing the load sensing control is designed to be capable of efficiently combusting and removing filter deposits inside an exhaust gas purification device (42) by pump output power increasing control when there is no actuator operation, eliminating interference between the actuator operation and the pump output power increasing control even when they are performed at the same time, and achieving these effects with ease and at a low cost. The hydraulic drive system comprises: a solenoid selector valve (46) which selects between tank pressure and delivery pressure of a pilot pump (30) upstream of an engine revolution speed detecting valve (13) and outputs the selected pressure to a shuttle valve (45) ; and a solenoid selector valve (48) which is arranged in a line (12b) leading the output pressure of a differential pressure reducing valve (11) to an LS control valve (17b) and selects between enabling and disabling of the load sensing control. When the exhaust gas purification device (42) needs regeneration, a controller (49) executes switching to make the solenoid selector valve (46) output the delivery pressure of the pilot pump (30) as dummy load pressure and to make the solenoid selector valve (48) disable the load sensing control.
摘要翻译：执行负载检测控制的液压驱动系统被设计成能够在没有执行器操作时通过泵输出功率增加控制来有效地燃烧和去除废气净化装置（42）内的过滤器沉积物，消除致动器操作和即使在同时执行泵输出功率增加控制，并且以低成本容易地实现这些效果。液压驱动系统包括：电磁选择阀（46），其在发动机转速检测阀（13）上游的先导泵（30）的罐压力和输出压力之间进行选择，并将选择的压力输出到梭阀（45））; 以及螺线管切换阀（48），其布置成将减压阀（11）的输出压力引导到LS控制阀（17b）的线（12b）中，并且在启用和禁用负载感测控制之间进行选择。当废气净化装置42需要再生时，控制器49执行切换，使得电磁换向阀46输出先导泵30的输出压力为假负载压力，并使电磁选择阀（48）禁用负载感测控制。

3. 发明公开

EP4194619A1 WORK MACHINE 审中-实审
公开(公告)号：EP4194619A1
公开(公告)日：2023-06-14
申请号：EP21930336.9
申请日：2021-12-08
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： KUMAGAI Kento , IMURA Shinya , TSURUGA Yasutaka , CHIBA Takaaki , AMANO Hiroaki , NISHIKAWA Shinji , NARAZAKI Akihiro , SUGIYAMA Genroku , YAMAMOTO Shinjiro
IPC分类号： E02F9/20 , F15B11/00 , F15B11/02
摘要： The invention of the present application intends to provide a work machine that can ensure high operability by preventing abrupt actuation of an actuator and a shock to a machine body by use of a bleed-off function at the time of starting of the actuator and that can improve the energysaving performance by reducing a bleed-off flow rate after the starting of the actuator. For this purpose, a controller opens a bleed-off valve at a timing at which an operation device is being operated and before a flow rate of a hydraulic pump starts increasing, and closes the bleed-off valve at a timing at which the operation device is being operated and after the flow rate of the hydraulic pump has started increasing.

4. 发明公开

EP3428456A1 CONSTRUCTION MACHINERY 有权
公开(公告)号：EP3428456A1
公开(公告)日：2019-01-16
申请号：EP16891898.5
申请日：2016-03-11
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： HOSHINO Masatoshi , TSURUGA Yasutaka , TAKAHASHI Kiwamu , HIJIKATA Seiji
IPC分类号： F15B11/00 , E02F9/22
摘要： 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).

5. 发明公开

EP3392511A1 CONSTRUCTION MACHINERY 有权
公开(公告)号：EP3392511A1
公开(公告)日：2018-10-24
申请号：EP16875442.2
申请日：2016-12-05
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： KOBAYASHI Hiroyuki , SAKAMOTO Hiroshi , TSURUGA Yasutaka
IPC分类号： F15B11/04 , E02F9/20 , F15B11/08
CPC分类号： E02F9/2228 , E02F9/20 , E02F9/2267 , E02F9/2271 , E02F9/2285 , F15B11/04 , F15B11/08 , F15B2211/30525 , F15B2211/526 , F15B2211/6653
摘要： A construction machine that can ensure an initial response that varies in accordance with a hydraulic actuator in a similar fashion to a case of adopting a hydraulic pilot-type operation device is provided. A controller 100 of a hydraulic excavator outputs a command current for driving the corresponding solenoid proportional valve (i.e. some of solenoid proportional valves 41a, 41b, 42a to 42d, 43a to 43d, 44a and 44b) in response to an operation signal from an electric lever-type work operation device 2a or 2b, and includes a correction function to correct the command current such that the command current is higher than a target current corresponding to an operation amount of the operation device for preset predetermined time at a time of starting to operate the operation device from a neutral position thereof. This correction function corrects only the command current to the bucket solenoid proportional valves 44a and 44b.

6. 发明公开

EP3076027A1 HYDRAULIC DRIVE DEVICE FOR CONSTRUCTION MACHINE 有权转让
标题翻译： HYDRAULISCHE ANTRIEBSVORRICHTUNGFÜREINE BAUMASCHINE
公开(公告)号：EP3076027A1
公开(公告)日：2016-10-05
申请号：EP14866109.3
申请日：2014-11-26
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： TSURUGA Yasutaka , TAKAHASHI Kiwamu , OKAZAKI Yasuharu , NOBEZAWA Hiroyuki , YAMADA Kenji
IPC分类号： F15B11/02 , E02F9/22 , F15B11/00
CPC分类号： E02F9/2235 , E02F3/325 , E02F9/2228 , E02F9/2232 , E02F9/2267 , E02F9/2292 , E02F9/2296 , F15B11/17 , F15B13/025 , F15B13/026 , F15B13/0803 , F15B20/007 , F15B2211/20523 , F15B2211/20546 , F15B2211/20553 , F15B2211/20576 , F15B2211/25 , F15B2211/6652 , F15B2211/6655
摘要： It is an object of the present invention to accurately detect the absorption torque of the other of two hydraulic pumps by a purely hydraulic structure and feed the absorption torque to one of the two hydraulic pumps, thereby to accurately perform a total torque control, effectively utilize a rated output torque of a prime mover, and enhance mountability. To achieve the object, there are provided: a torque feedback circuit 31 to which the delivery pressure of a first hydraulic pump 1a and a load sensing drive pressure are introduced, which modifies the delivery pressure of a second hydraulic pump 1b to provide a characteristic simulating the absorption torque of the second hydraulic pump 1b, and which outputs the modified pressure; and torque feedback pistons 32a, 32b to which the output pressure of the torque feedback circuit 31 is introduced, and which control the capacity of the first hydraulic pump 1a to decrease the capacity of the first hydraulic pump 1a and decrease a maximum torque T1max as the output pressure becomes higher. The torque feedback circuit 31 includes pressure dividing restrictor parts 34a, 34b, pressure dividing valves 35a, 35b, and relief valves 37a, 37b.
摘要翻译：本发明的目的是通过纯水力结构精确地检测两个液压泵中的另一个的吸收扭矩，并将吸收扭矩馈送到两个液压泵中的一个，从而精确地执行总转矩控制，有效地利用原动机的额定输出转矩，并增强了安装性。为了实现该目的，提供了一种扭矩反馈电路31，第一液压泵1a的输送压力和负载感测驱动压力被引入到该扭矩反馈电路31，该第二液压泵1b的输送压力改变第二液压泵1b的输送压力，以提供模拟的特性第二液压泵1b的吸收转矩，并输出修正压力; 以及引入扭矩反馈回路31的输出压力的扭矩反馈活塞32a，32b，并且控制第一液压泵1a的容量，以降低第一液压泵1a的容量，并将最大转矩T1max减小为输出压力变高。扭矩反馈回路31包括分压限制部34a，34b，分压阀35a，35b，溢流阀37a，37b。

7. 发明公开

EP2662576A1 HYDRAULIC DRIVE OF WORK MACHINE EQUIPPED WITH CRAWLER-TYPE TRAVELING DEVICE 有权转让
标题翻译：水疗师ANTRIEB EINER ARBEITSMASCHINE MIT EINER RAUPENLAUFVORRICHTUNG
公开(公告)号：EP2662576A1
公开(公告)日：2013-11-13
申请号：EP12732178.4
申请日：2012-01-05
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： MORI Kazushige , TSURUGA Yasutaka , TAKAHASHI Kiwamu , TAKEBAYASHI Yoshifumi
IPC分类号： F15B11/05 , E02F9/22 , F15B11/08 , F15B11/16
CPC分类号： E02F9/2267 , E02F3/325 , E02F3/964 , E02F9/02 , E02F9/2225 , E02F9/2228 , E02F9/2232 , E02F9/2235 , E02F9/2271 , E02F9/2285 , E02F9/2292 , E02F9/2296 , E02F9/267 , F04B17/03 , F15B11/163 , F15B11/165 , F15B13/026 , F15B19/002 , F15B2211/20523 , F15B2211/20546 , F15B2211/20553 , F15B2211/30535 , F15B2211/3111 , F15B2211/3116 , F15B2211/323 , F15B2211/355 , F15B2211/522 , F15B2211/528 , F15B2211/5756 , F15B2211/6054 , F15B2211/7058 , F15B2211/7135 , F15B2211/782
摘要： A hydraulic drive system for a working machine including a track device of crawler type is provided. The track device of crawler type travels with hydraulic fluid supplied from at least one hydraulic pump to right and left track motors. The hydraulic drive system is capable of easily correcting skew traveling for straight line traveling without having to replace a track motor or other large-size device and without having to specially modify a main circuit.
A traveling test is conducted upon shipment from a factory. If skew is noted during the test, a plug 65b disposed on the side of a valve opening-side pressure receiving portion 28b (or 28d) of a pressure compensating valve 27b (or 27d) for track whichever is lower in speed is removed and, instead, an adjusting mechanism-mounted plug 37 is mounted. An adjusting pin 37b of the adjusting mechanism-mounted plug 37 is operated so as to strengthen a biasing force of a target compensating differential pressure adjusting spring 36b. An opening in the pressure compensating valve 27b (or 27d) is thereby corrected in an opening direction and a flow rate to a left track motor 6 (or 8) is thereby adjusted to be equal to that of a right track motor 8 (or 6).
摘要翻译：提供了一种用于包括履带式履带装置的作业机械的液压驱动系统。履带式履带装置由从至少一个液压泵供给到左右履带马达的液压油运行。液压驱动系统能够容易地校正直线行进的偏斜行进，而不必更换轨道马达或其他大尺寸装置，而无需专门改装主回路。从工厂出货时进行旅行测试。如果在测试期间发生偏斜，则移除设置在速度较低者的轨道的压力补偿阀27b（或27d）的开阀侧压力接收部分28b（或28d）侧的塞子65b，相反，安装有调节机构的插头37。操作调整机构安装插头37的调节销37b，以加强目标补偿压差调节弹簧36b的偏置力。因此，压力补偿阀27b（或27d）中的开口在打开方向上被校正，并且向左轨道电动机6（或8）的流量被调节为与右轨道电动机8（或6））。

8. 发明公开

EP4190979A1 WORK MACHINE 审中-公开
公开(公告)号：EP4190979A1
公开(公告)日：2023-06-07
申请号：EP21933268.1
申请日：2021-12-17
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： HOSHINO Masatoshi , HIJIKATA Seiji , TSURUGA Yasutaka , YAGISAWA Ryou , FURUKAWA Shou
IPC分类号： E02F9/22 , F02D29/04
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.

9. 发明公开

EP4101995A1 CONSTRUCTION MACHINE 审中-实审
公开(公告)号：EP4101995A1
公开(公告)日：2022-12-14
申请号：EP21882786.3
申请日：2021-10-18
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： HIJIKATA Seiji , TSURUGA Yasutaka , HOSHINO Masatoshi , YAGISAWA Ryou
IPC分类号： E02F9/22 , F15B11/00 , F15B11/02 , F15B11/042 , F15B21/14
摘要： The present invention provides a construction machine equipped with a pressure accumulation device that accumulates return oil from an actuator, and that can implement both improvement in fuel efficiency with enhancement in workability. To achieve the foregoing, a controller sets an actuator upper limit output power that is an upper limit for an output power of the actuator according to a work mode selected by a work mode selection device, and controls a first control valve and a second control valve such that a sum of an output power of a hydraulic pump and an output power of the pressure accumulation device does not exceed the actuator upper limit output power.

10. 发明公开

EP3361007A1 CONSTRUCTION MACHINERY 审中-公开
公开(公告)号：EP3361007A1
公开(公告)日：2018-08-15
申请号：EP16853639.9
申请日：2016-10-05
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： NARIKAWA Ryu , MORIKI Hidekazu , TSURUGA Yasutaka , SAKAMOTO Hiroshi , IZUMI Shiho
IPC分类号： E02F3/43 , E02F9/20 , E02F9/22 , F02D29/00 , F02D29/04
摘要： A hydraulic excavator includes: a hydraulic pump (2) driven by power generated by an engine (22); a work device (50) that operates by a plurality of hydraulic cylinders (5, 6, 7) driven by power generated by the hydraulic pump; an actuator control section (303) that controls the boom cylinder (5) in such a manner that a tip end of a bucket (10) is located on or above a target surface; a control point position calculation section (301) that calculates a bucket claw tip position on the basis of angle sensors (30 to 33); and a power generator control section (305, 310) that imposes more limitations on output power ranges of the engine (22) and the hydraulic pump (2) when a distance between the claw tip position and the target surface is equal to or smaller than a threshold D than those when the distance between the claw tip position and the target surface is larger than the threshold D.

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