专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明公开

EP4036408A1 ELECTRIC HYDRAULIC WORKING MACHINE 审中-公开
公开(公告)号：EP4036408A1
公开(公告)日：2022-08-03
申请号：EP19946733.3
申请日：2019-09-24
申请人： Hitachi Construction Machinery Tierra Co., Ltd.
发明人： TAKAHASHI Kiwamu , KIHARA Seiichi , OGAWA Yuichi , ISHII Takeshi
IPC分类号： F04B49/06 , F15B11/00
摘要： In a hydraulic drive system used for an electrically driven hydraulic work machine that drives a hydraulic pump by an electric motor and supplies a hydraulic fluid to plural actuators to carry out work, the power consumption of the hydraulic pump is kept from exceeding a value decided in advance. For this purpose, a controller calculates target power to be consumed by the hydraulic pump on the basis of the capacity of the hydraulic pump, the delivery pressure of the hydraulic pump sensed by a pressure sensor, and a target revolution speed of the electric motor, and limits the target revolution speed of the electric motor in such a manner that the target power falls within a range of the maximum allowable power.

2. 发明公开

EP3995632A1 CONSTRUCTION MACHINERY 审中-实审
公开(公告)号：EP3995632A1
公开(公告)日：2022-05-11
申请号：EP20870184.7
申请日：2020-06-12
申请人： Hitachi Construction Machinery Tierra Co., Ltd.
发明人： ISHII Takeshi , TAKAHASHI Kiwamu
IPC分类号： E02F9/20 , E02F9/22
摘要： A construction machine is provided which is capable of detecting an operation state of an operation device even if the idle rotation speed for a prime mover is set to a low value and is capable of setting the idle rotation speed for the prime mover to a low value. A hydraulic excavator includes an operation device that generates a pilot pressure corresponding to an operation amount of an operation lever and switches a control valve with the generated pilot valve, and a controller that controls an electric motor such that the rotation speed of the electric motor becomes an idle rotation speed set in advance when a no-operation state of the operation device continues. The hydraulic excavator further includes a hydraulic pressure signal line that is connected between the discharge side of a pilot pump and a tank and in which the control valve is interposed, a fixed restrictor provided between the discharge side of the pilot pump and the control valve in the hydraulic pressure signal line, and pressure sensors that individually detect the hydraulic pressures on the upstream side and the downstream side of the fixed restrictor. The controller detects an operation state of the operation device on the basis of results of detection of the pressure sensors.

3. 发明授权

EP3396071B1 COMPACT CONSTRUCTION MACHINE 有权
公开(公告)号：EP3396071B1
公开(公告)日：2020-07-29
申请号：EP16878055.9
申请日：2016-09-07
申请人： Hitachi Construction Machinery Tierra Co., Ltd.
发明人： SETAKI, Masashi , TANAKA, Tomoyuki , KAWAMOTO, Junya
IPC分类号： E02F9/00 , B60K15/05 , E05B83/34

4. 发明公开

EP3591239A1 HYDRAULIC DRIVE DEVICE FOR CONSTRUCTION MACHINE 有权
公开(公告)号：EP3591239A1
公开(公告)日：2020-01-08
申请号：EP18908261.3
申请日：2018-03-28
申请人： Hitachi Construction Machinery Tierra Co., Ltd.
发明人： TAKAHASHI Kiwamu , MAEHARA Taihei , ISHII Takeshi
IPC分类号： F15B11/05 , E02F9/22
摘要： Even where the differential pressure across a directional control valve associated with each actuator is very small, flow dividing control of the plurality of directional control valves can be performed stable, and even where a demanded flow rate suddenly changes at the time of transition from composite action to single action or the like, a sudden change of the flow rate of hydraulic fluid to be supplied to each actuator is prevented to implement superior combined operability. Further, the meter-in loss of the directional control valves can be reduced to implement a high energy efficiency. To this end, a plurality of pressure compensating valves 7a, 7b and 7c for controlling such that the pressure in the downstream side of the meter-in opening of a plurality of directional control valves 6a, 6b and 6c becomes equal to the highest load pressure are individually arranged in the downstream side of meter-in openings of the plurality of directional control valves 6a, 6b and 6c, and demanded flow rates for the directional control valves 6a, 6b and 6c are calculated from input amounts of operation levers. Besides, the meter-in pressure loss of a predetermined directional control valve is calculated from the demanded flow rates for and meter-in opening areas of the directional control valves 6a, 6b and 6c, and the set pressure of the unloading valve 15 is controlled using the value of the meter-in pressure loss.

5. 发明公开

EP3581715A1 CONSTRUCTION MACHINE 有权
公开(公告)号：EP3581715A1
公开(公告)日：2019-12-18
申请号：EP18808876.9
申请日：2018-05-31
申请人： Hitachi Construction Machinery Tierra Co., Ltd.
发明人： KIMURA, Hitoshi , KAWAMOTO, Junya , MAEDA, Kohei , YUNOUE, Masayuki
IPC分类号： E02F9/20 , E02F9/16 , E02F9/26
摘要： A controller (27) mounted on a small-sized hydraulic excavator (1) includes an engine restart section (27E) that restarts an engine (10) when a horn switch operation determining section (27B) determines that a horn switch (14) is operated and a gate lock lever position determining section (27C) determines that a gate lock lever (16) is at a lock position in a case where a restart standby time determining section (27A) determines that restart standby time (T2) does not yet elapse after the engine (10) is automatically stopped by an idling stop function, and a power supply stopping section (27F) that stops an electric power supply of a vehicle body (2, 3) when the restart standby time determining section (27A) determines that the restart standby time (T2) has elapsed.

6. 发明公开

EP3514029A1 HYBRID WORK MACHINE 有权
公开(公告)号：EP3514029A1
公开(公告)日：2019-07-24
申请号：EP16916291.4
申请日：2016-09-16
申请人： Hitachi Construction Machinery Tierra Co., Ltd.
发明人： YOSHIDA, Hajime , NOGUCHI, Shuuhei , ISHII, Motoaki
IPC分类号： B60W10/08 , B60K6/485 , B60W10/06 , B60W20/13 , E02F9/00
摘要： To achieve saving of fuel consumption and noise reduction by adopting a hybrid type and miniaturizing an engine and to ensure safe and reliable battery charging in a case in which a charge amount of a battery is quite insufficient, a hydraulic work machine includes: a gate lock sensor (28); a forced charging switch (41); a work machine monitor (43) that notifies an operator that a charging rate of a battery (33) falls to be lower than a critical charging rate; and a machine controller (46). The machine controller (46) actuates a generator motor (31) as a generator to forcedly charge the battery (33) when a gate lock lever (26) is operated to a lock position (D), an engine control dial (12) designates a low idle engine speed, and the forced charging switch (41) is operated.

7. 发明授权

EP3006744B1 HYDRAULIC DRIVE DEVICE FOR CONSTRUCTION MACHINERY 有权转让
公开(公告)号：EP3006744B1
公开(公告)日：2019-06-12
申请号：EP14804940.6
申请日：2014-04-21
申请人： Hitachi Construction Machinery Tierra Co., Ltd.
发明人： TAKAHASHI Kiwamu , TSURUGA Yasutaka , TAKEBAYASHI Yoshifumi , MORI Kazushige , NAKAMURA Natsuki
IPC分类号： F15B11/02 , E02F9/22 , F15B11/17 , F15B11/00 , E02F3/32 , E02F3/42

9. 发明授权

EP3121453B1 HYDRAULIC DRIVE APPARATUS FOR CONSTRUCTION MACHINERY 有权转让
公开(公告)号：EP3121453B1
公开(公告)日：2019-03-13
申请号：EP14886607.2
申请日：2014-12-02
申请人： Hitachi Construction Machinery Tierra Co., Ltd.
发明人： TAKAHASHI Kiwamu , MORI Kazushige , TAKEBAYASHI Yoshifumi , NAKAMURA Natsuki
IPC分类号： F15B11/02 , E02F9/22 , F15B11/00 , F15B11/05 , F15B11/17

10. 发明授权

EP2540915B1 ELECTRICAL CONSTRUCTION MACHINE 有权转让
公开(公告)号：EP2540915B1
公开(公告)日：2019-02-20
申请号：EP10846173.2
申请日：2010-12-01
申请人： Hitachi Construction Machinery Tierra Co., Ltd.
发明人： YUNOUE Masayuki , NOGUCHI Akira
IPC分类号： E02F9/00 , E02F9/22 , E02F9/20 , E02F9/08 , B60K11/08

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