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公开(公告)号：US20230212835A1
公开(公告)日：2023-07-06
申请号：US18000882
申请日：2021-06-02
发明人： Masahiro KAWAMOTO
CPC分类号： E02F3/435 , E02F3/425 , E02F9/123 , E02F9/2228 , E02F9/2292 , E02F9/2296 , E02F9/2235 , E02F9/26 , F15B11/17 , E02F3/963
摘要： A confluence control part of a slewing-type construction machine controls a confluence switch valve such that the confluence switch valve is switched to a suspension state when a slewing and boom raising manipulation action is performed. A pump capacity control part of the slewing-type construction machine executes a capacity control when the slewing and boom raising manipulation action is performed, the capacity control including regulating a first pump capacity and a second pump capacity respectively in such a manner that the first pump capacity increases and the second pump capacity decreases as an operating pressure difference resulting from the subtraction of a slewing operating pressure from a boom operating pressure increases, and the first pump capacity decreases and the second pump capacity increases as the operating pressure difference decreases.
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公开(公告)号：US20210277630A1
公开(公告)日：2021-09-09
申请号：US17177269
申请日：2021-02-17
发明人： Natsuki YUMOTO , Masahiro KAWAMOTO
IPC分类号： E02F9/22
摘要： Provided is a hydraulic drive apparatus of a work machine capable of reducing a surge pressure. The hydraulic drive apparatus includes a control valve interposed between the hydraulic pump and a hydraulic actuator, an operation device moving the control valve in response to an actuator operation, an unload valve, an unload operation valve changing a pilot pressure of the unload valve in response to an input of an unload operation command, a target pressure calculation part, and an unload operation command part. The target pressure calculation part calculates a target pressure that increases with an increase in the holding pressure of the hydraulic actuator. The unload operation command part inputs an unload operation command to the unload operation valve to make the pump pressure of the hydraulic pump follow the target pressure.
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公开(公告)号：US20240011248A1
公开(公告)日：2024-01-11
申请号：US18252262
申请日：2021-10-26
CPC分类号： E02F9/2296 , E02F9/2292 , E02F9/123
摘要： A speed compensation part included in a construction machine executes a feedback control of regulating an opening degree of a second control valve to an opening degree obtained by subtracting a correction amount from a second target opening degree of the second control valve, when a combined manipulation is performed and a preset load determination condition is satisfied. The correction amount is calculated by the speed compensation part so as to be larger as a speed difference between a first target speed and a first actual speed becomes larger, the first target speed being a target speed of a first actuator and determined on the basis of a manipulation amount of a first instructive manipulation, the first actual speed being an actual speed of the first actuator.
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