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. 发明授权

US10221871B2 Construction machinery 有权
公开(公告)号：US10221871B2
公开(公告)日：2019-03-05
申请号：US15422152
申请日：2017-02-01
申请人： Hitachi Construction Machinery Co., Ltd. , Takako Satake
发明人： Shinya Imura , Hidetoshi Satake , Kouji Ishikawa , Seiji Hijikata , Takatoshi Ooki , Shinji Nishikawa
IPC分类号： F15B13/06 , F15B21/00 , E02F9/12 , E02F9/22 , F15B21/14 , F15B11/20 , E02F9/20
摘要： The Construction machinery includes at least two actuators, a main pump that generates hydraulic energy for driving the actuators, control valves disposed between the main pump and the actuators, a hydraulic pump motor driven by the generator motor that generates energy to be added to the hydraulic energy, and a controller that reduces hydraulic energy generated by the main pump when the hydraulic pump motor driven by the generator-motor generates energy. The construction machinery further comprises changeover valves that selectively change a location at which the energy from the hydraulic pump motor driven by the generator-motor is to be added according to the actuators. The controller changes a reduction rate of the hydraulic energy generated by the main pump depending on a specific actuator to which the energy is to be added.

2. 发明授权

US12031298B2 Work machine 有权
公开(公告)号：US12031298B2
公开(公告)日：2024-07-09
申请号：US17275757
申请日：2020-01-22
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： Takatoshi Ooki
IPC分类号： E02F9/22 , B62D5/09 , B62D5/28 , B62D5/30 , E02F9/24 , E02F9/26 , F15B20/00
CPC分类号： E02F9/225 , B62D5/091 , B62D5/28 , B62D5/30 , E02F9/24 , F15B20/00 , E02F9/26
摘要： The present invention provides a work machine including a steering device that is very responsive to switching operations. The work machine includes: a proportional solenoid valve for outputting a first pilot pressure oil with a pressure responding to a steering signal; a solenoid valve for outputting a second pilot pressure oil with a predetermined pressure while the steering signal is outputted from the steering device; a switching valve capable of switching to a first state of outputting the first pilot pressure oil to a directional control valve and a second state of outputting the second pilot pressure oil to the directional control valve, while the first pilot pressure oil is outputted from the proportional solenoid valve and the second pilot pressure oil is outputted from the solenoid valve in parallel; and a controller to switch the switching valve from the first state to the second state in a case where a malfunction is detected in a main circuit ranging from the steering device to the directional control valve via the proportional solenoid valve and the switching valve of the first state.

3. 发明授权

US10301793B2 Hydraulic drive system for work machine 有权
公开(公告)号：US10301793B2
公开(公告)日：2019-05-28
申请号：US15516089
申请日：2014-10-02
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Seiji Hijikata , Kouji Ishikawa , Takatoshi Ooki , Shinya Imura
IPC分类号： E02F9/22 , E02F3/42 , F15B21/14 , F15B11/16 , E02F3/32
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.

4. 发明授权

US10161108B2 Hydraulic fluid energy recovery system for work 有权
公开(公告)号：US10161108B2
公开(公告)日：2018-12-25
申请号：US15023867
申请日：2014-01-28
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 , E02F9/20 , F15B11/08 , F15B13/04 , F15B13/044 , E02F3/32
摘要： Provided is a hydraulic fluid energy recovery system for a work machine equipped with a hydraulic pump, a hydraulic actuator for driving the work machine, an operating device for operating the hydraulic actuator, and a regenerating device for recovering a return fluid flowing back from the hydraulic actuator. The hydraulic fluid energy recovery system includes: a fluid line for allowing the return fluid from the hydraulic actuator to flow through the line; a section for branching the fluid line into a plurality of fluid lines; a recovery circuit that serves as one of the branch fluid lines and includes the regenerating device; a discharge circuit that serves as the other of the branch fluid lines and discharges the return fluid to a tank; a flow control device disposed in the discharge circuit so as to be able to control a flow rate of the return fluid; an operation amount detector for detecting the operation amount on the operating device; and a control device configured to acquire the operation amount detected by the operation amount detector, calculate a target discharge flow rate of the return fluid flowing through the discharge circuit, and calculate a target regeneration flow rate of the return fluid flowing through the recovery circuit, the control device thereby controlling the flow control device according to the target discharge flow rate and also controlling the regenerating device according to the target regeneration flow rate.

5. 发明授权

US10669695B2 Hydraulic driving device for working machine 审中-公开
公开(公告)号：US10669695B2
公开(公告)日：2020-06-02
申请号：US16327150
申请日：2018-01-31
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Masamichi Ito , Takatoshi Ooki
IPC分类号： F15B21/14 , E02F9/22 , F15B11/05
摘要： There is provided a hydraulic driving device for working machine having operability handling a change in burden weight in a front working device due to a loaded burden and the like when the working machine that accumulates energy in an accumulator and recovers and regenerates the energy performs an operation of lowering the front working device. A hydraulic driving device 5 includes a main pump 101, a boom cylinder 3, a tank 20, a flow rate control valve 6, an accumulator 300, a first differential pressure control valve 201, and a second differential pressure control valve 202. The first differential pressure control valve 201 is located between the boom cylinder 3 and the accumulator 300. The first differential pressure control valve 201 performs control on discharge oil from the boom cylinder 3 such that a differential pressure between before and after the flow rate control valve 6 becomes a target differential pressure. The second differential pressure control valve 202 is located between the accumulator 300 and the tank 20. The second differential pressure control valve 202 performs control on the discharge oil such that a differential pressure between an upstream pressure and a downstream pressure of the flow rate control valve 6 and the first differential pressure control valve 201 becomes the target differential pressure. The first and the second differential pressure control valves 201 and 202 are configured such that the target differential pressure increases according to an increase in pressure of the discharge oil.

6. 发明授权

US09926950B2 Hydraulic system for construction machinery 有权
公开(公告)号：US09926950B2
公开(公告)日：2018-03-27
申请号：US14753374
申请日：2015-06-29
申请人： HITACHI CONSTRUCTION MACHINERY CO., LTD.
发明人： Takatoshi Ooki , Seiji Hijikata , Kouji Ishikawa
IPC分类号： F16D31/02 , F15B20/00 , F15B11/024 , F15B15/14 , E02F9/20 , E02F9/22 , E02F9/26 , F15B21/14
CPC分类号： F15B20/007 , E02F9/2095 , E02F9/2217 , E02F9/2285 , E02F9/2296 , E02F9/268 , F15B11/024 , F15B15/14 , F15B20/002 , F15B21/14 , F15B2211/20546 , F15B2211/3058 , F15B2211/31 , F15B2211/40515 , F15B2211/415 , F15B2211/41527 , F15B2211/6355 , F15B2211/7053 , F15B2211/8623 , F15B2211/8626 , F15B2211/88
摘要： A hydraulic system for construction machinery is capable of suppressing irregularity in the operation of the front structure not intended by the operator, and includes a regeneration motor adapted to be driven by return fluid from a bottom port of a boom cylinder; a regeneration electric motor converting rotary power into electric energy; return fluid control valves controlling the flow of the return fluid according to a pilot pressure related to an operation of a boom control lever; and a malfunction prevention device adapted to be activated by pressure fluctuation caused by malfunction of a solenoid valve for the return fluid control valve that interrupts the delivery of a pilot secondary pressure from the solenoid valve to the corresponding return fluid control valve.

7. 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.

8. 发明授权

US10184228B2 Hydraulic driving device of work machine 有权
公开(公告)号：US10184228B2
公开(公告)日：2019-01-22
申请号：US15447836
申请日：2017-03-02
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Masamichi Ito , Takatoshi Ooki , Kiwamu Takahashi
IPC分类号： F15B21/14 , E02F9/22 , F15B1/04 , F15B11/08 , F15B13/02 , F15B13/04 , F15B11/024 , E02F3/32
摘要： 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.

9. 发明授权

US10030361B2 Construction machine 有权
公开(公告)号：US10030361B2
公开(公告)日：2018-07-24
申请号：US15119879
申请日：2014-04-03
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Seiji Hijikata , Kouji Ishikawa , Takatoshi Ooki , Shinya Imura
IPC分类号： F16D31/02 , E02F9/12 , F15B21/14 , E02F9/22 , E02F9/20 , F15B11/08 , F15B13/02 , F15B21/08 , E02F3/32
摘要： A controller sets a target flow rate of a regenerative hydraulic motor at zero or a low flow rate within an extent in which hydraulic pressure in a regeneration hydraulic line does not become negative pressure when a detected pressure PS detected by a pressure sensor is lower than a first set value previously set by overload relief valves, sets the target flow rate of the regenerative hydraulic motor at a value corresponding to the detected pressure when the detected pressure is higher than or equal to the first set value, and controls the revolution speed of a generator/motor in such a manner that a flow rate through the regenerative hydraulic motor equals the target flow rate. With such features, excellent operability equivalent to that in the conventional technology can be secured.

10. 发明授权

US09926951B2 Energy regeneration system for construction machine 有权
公开(公告)号：US09926951B2
公开(公告)日：2018-03-27
申请号：US14771589
申请日：2014-07-24
申请人： Hitachi Construction Machinery Co., Ltd.
发明人： Takatoshi Ooki , Seiji Hijikata
IPC分类号： F15B21/14 , E02F9/12 , E02F9/20 , E02F9/22
CPC分类号： F15B21/14 , E02F9/123 , E02F9/2075 , E02F9/2217 , E02F9/2285 , E02F9/2296 , F15B2211/7058
摘要： Energy regeneration system does not affect operation of a hydraulic actuator except when a relief valve is operating, by connecting an actuator hydraulic line to a regeneration hydraulic motor with a small pressure loss during regeneration, and ensures holding pressure when the energy cannot be regenerated. A first valve device disposed between actuator hydraulic lines and a regeneration hydraulic motor, has a throttle passage capable of increasing pressure in the higher pressure side actuator hydraulic line to a set pressure of the relief valves. A second valve device disposed in parallel with the first valve device between the actuator hydraulic lines and the regeneration hydraulic motor, is switched from a close to an open position by pressure between the first valve device and the regeneration hydraulic motor when pressure between the first valve device and the regeneration hydraulic motor increases to approach the set pressure of the swing relief valve.

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