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公开(公告)号：US11377822B2
公开(公告)日：2022-07-05
申请号：US16330407
申请日：2017-09-08
IPC分类号： E02F9/22
摘要： A first torque control proportional electromagnetic valve (37) is connected through a first torque control line (41) to a third pressure receiving chamber (32D) in a first torque control regulator (32). A second torque control proportional electromagnetic valve (38) is connected through a second torque control line (42) to a third pressure receiving chamber (35D) in a second torque control regulator (35). The first and second torque control proportional electromagnetic valves (37, 38) are controlled by a controller 47. A switching valve (48) is provided between the first torque control line (41) and the second torque control line (42). The switching valve (48) supplies an output pressure of the first torque control proportional electromagnetic valve (37) to the third pressure receiving chamber (35D) in the second torque control regulator (35) at the time of driving hydraulic motors (2B, 2C) for left side and right side traveling.
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公开(公告)号：US11066808B2
公开(公告)日：2021-07-20
申请号：US16320504
申请日：2017-10-31
发明人： Hiroki Takeuchi , Kouji Ishikawa , Shiho Izumi , Shuuichi Meguriya , Tarou Akita
IPC分类号： E02F3/43 , E02F9/22 , F15B11/046 , F15B11/08 , F15B21/02
摘要： A work machine includes: control valves that control flows of a hydraulic operating oil supplied to actuators; operation lever devices that generate hydraulic signals to be output to the corresponding control valves according to an operation; solenoid proportional valves that reduce pressure of the hydraulic signals generated by the corresponding operation lever devices; and a front implement control section that controls the solenoid proportional valves. The work machine further includes: operation signal lines connected to the operation lever devices; signal input lines connected to the control valves; pressure reducing lines provided with the solenoid proportional valves; and selector valves that have a first position that interrupts connection of the operation signal lines and the pressure reducing lines and directly connects the operation signal lines to the signal input lines, and a second position that connects the operation signal lines to the signal input lines via the pressure reducing lines.
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公开(公告)号：US10760246B2
公开(公告)日：2020-09-01
申请号：US16499921
申请日：2018-03-08
发明人： Seiji Hijikata , Kouji Ishikawa , Shinya Imura
摘要： Provided is a work machine capable of regenerating a return hydraulic fluid from a hydraulic actuator while preventing a drag loss of a regeneration hydraulic motor and a hydraulic pump from increasing and preventing the regeneration efficiency of the regeneration hydraulic motor from decreasing. A controller 100 computes a required regeneration hydraulic motor revolution speed from a displacement of a regeneration hydraulic motor 13 and a regeneration flow rate of the regeneration hydraulic motor, computes a required first hydraulic pump revolution speed from a displacement of a first hydraulic pump 15 and a target assist flow rate of the first hydraulic pump, and selects a greater one of the required regeneration hydraulic motor revolution speed and the required first hydraulic pump revolution speed as a target revolution speed of an electric motor 14.
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公开(公告)号：US10526767B2
公开(公告)日：2020-01-07
申请号：US15556103
申请日：2015-09-29
发明人： Seiji Hijikata , Kouji Ishikawa , Shinya Imura
摘要： Provided is a construction machine allowing regeneration of a return hydraulic fluid at the time of both a boom raising operation and a boom lowering operation with a small number of valves, making it possible to secure a satisfactory operability at the time of both the boom raising operation and the boom lowering operation.The construction machine includes: a first hydraulic actuator; a second hydraulic actuator; a tank; and a first hydraulic pump supplying a hydraulic fluid to the second hydraulic actuator, the construction machine further including: a return hydraulic fluid selection device selecting a supply source of a return hydraulic fluid generated at a time of a raising operation or a lowering operation of the first hydraulic actuator and discharging the return hydraulic fluid; a regeneration line supplying the hydraulic fluid discharged from the return hydraulic fluid selection device to a portion between the second hydraulic actuator and the first hydraulic pump to regenerate the hydraulic fluid; a discharge line discharging the hydraulic fluid discharged from the return hydraulic fluid selection device to the tank; and a regeneration/discharge flow rate adjustment device capable of adjusting a flow rate of the hydraulic fluid flowing through the regeneration line and a flow rate of the hydraulic fluid flowing through the discharge line.
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公开(公告)号：US10480442B2
公开(公告)日：2019-11-19
申请号：US16218597
申请日：2018-12-13
IPC分类号： F02D41/22 , F02D41/00 , F02D41/04 , F02D41/26 , F02D29/04 , F02D29/02 , G07C5/00 , G07C5/08 , E02F9/26 , E02F9/20 , E02F3/32
摘要： An object of the present invention is to provide a working machine and a working machine monitoring system using the same which is capable of improving the accuracy in determining fuel property. The working machine is provided with an engine operation parameter acquisition module (1041) that acquires an engine operation parameter representing the operation state of an engine mounted on the working machine; a refueling time acquisition module (1011) that acquires a refueling time when the working machine is supplied with fuel; and a fuel property determination module (1014) that determines the property of the fuel based on a comparison result of the time when the engine operation parameter changes, with the refueling time.
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公开(公告)号：US10344458B2
公开(公告)日：2019-07-09
申请号：US15554118
申请日：2016-06-01
发明人： Seiji Hijikata , Kouji Ishikawa , Shinya Imura
摘要： A hydraulic drive system 100A for a work machine includes: a boom cylinder 4; an arm cylinder 8; a hydraulic pump device 51; a control valve 5; a regenerative device 61; a first operation device 41; a second operation device 42; a sensor device 71; and a controller 27. The sensor device 71 includes at least one of pressure sensors 23, 24, 25, and 26. The controller 27 includes an abnormality detection part 142 and a first control part. The abnormality detection part 142 determines whether or not the sensor device 71 is abnormal. If the sensor device 71 is abnormal, the first control part controls the regenerative device 61 such that the hydraulic fluid returning from the boom cylinder 4 is not supplied to the arm cylinder 8 even if the values measured by the sensor device 71 satisfy regenerative conditions.
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公开(公告)号：US10309079B2
公开(公告)日：2019-06-04
申请号：US15120559
申请日：2015-04-14
摘要： An object of the present invention is to provide a hydraulic control system for a work machine that is capable of reducing the loss caused by flow division while reducing a decrease in the speed of a hydraulic actuator due to a combined operation. The hydraulic control system for a work machine includes a first hydraulic actuator, one hydraulic pump, a second hydraulic actuator, and another hydraulic pump. The hydraulic control system further includes operating instruction detection means and pump flow control means. The operating instruction detection means detects that operating instructions are issued to the first hydraulic actuator and the second hydraulic actuator. The pump flow control means individually adjusts the delivery flow rate of the one hydraulic pump and the another hydraulic pump in accordance with operation amounts designated by the operating instructions for the first and second hydraulic actuators. When the first and second hydraulic actuators are simultaneously operated, the pump flow control means increases the delivery flow rate of the one hydraulic pump to a higher rate than when the first hydraulic actuator is operated and the second hydraulic actuator is not operated.
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公开(公告)号：US10301793B2
公开(公告)日：2019-05-28
申请号：US15516089
申请日：2014-10-02
发明人： Seiji Hijikata , Kouji Ishikawa , Takatoshi Ooki , Shinya Imura
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.
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公开(公告)号：US10161108B2
公开(公告)日：2018-12-25
申请号：US15023867
申请日：2014-01-28
发明人： Seiji Hijikata , Kouji Ishikawa , Takatoshi Ooki , Shinya Imura
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.
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公开(公告)号：US09890518B2
公开(公告)日：2018-02-13
申请号：US14431062
申请日：2013-10-15
发明人： Kensuke Sato , Tsuyoshi Nakamura , Kouji Ishikawa
IPC分类号： E02F9/22 , F15B21/14 , E02F9/20 , F15B11/024
CPC分类号： E02F9/2217 , E02F9/2075 , E02F9/2095 , E02F9/2221 , E02F9/2282 , E02F9/2285 , E02F9/2296 , F15B11/024 , F15B21/14 , F15B2011/0246 , F15B2211/20515 , F15B2211/20569 , F15B2211/20576 , F15B2211/3058 , F15B2211/40515 , F15B2211/41527 , F15B2211/41563 , F15B2211/6313 , F15B2211/6316 , F15B2211/88
摘要： During boom-midair lowering operation in which a front work implement 130 can be turned under the self-weight of a boom 131, a hydraulic pump/motor 7 is operated as a motor to operate a generator/electric motor 10 as a generator. Power generation operation is performed by the hydraulic fluid discharged from a bottom-side chamber 5b of a boom cylinder 5 to recover positional energy. During jack-up in which the front work implement 130 cannot be turned under the self-weight of the boom 131, the generator/electric motor 10 is operated as an electric motor to operate the hydraulic pump/motor 7 as a pump. The jack-up is performed by supplying the hydraulic fluid from the bottom-side chamber 5b to rod-side chamber 5a of the boom cylinder 5 without supplying the hydraulic fluid from the main pump 2 to the rod-side chamber 5a of the boom cylinder 5.
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