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公开(公告)号：US20220333352A1
公开(公告)日：2022-10-20
申请号：US17640947
申请日：2020-11-02
发明人： Kento KUMAGAI , Shinya IMURA , Yasutaka TSURUGA , Takaaki CHIBA , Hiroaki AMANO , Shinji NISHIKAWA , Akihiro NARAZAKI , Genroku SUGIYAMA
摘要： Provided is a work machine which can achieve both of excellent operability when an operator manually operates a machine body or a work device and an accuracy of control of the machine body or the work device when a controller performs automatic control. The controller is configured to, in a case where the automatic control function selector switch gives an instruction to disable the automatic control function, adjust an opening amount of a bleed-off valve to a maximum opening amount or an opening amount corresponding to input amounts of control levers, and in a case where the automatic control function selector switch gives the instruction to enable the automatic control function, adjust the opening amount of the bleed-off valve, in at least part of an operation region of the control levers, so as to be smaller than the opening amount with the instruction to disable the automatic control function being given.
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公开(公告)号：US20220290406A1
公开(公告)日：2022-09-15
申请号：US17637533
申请日：2021-03-12
发明人： Kento KUMAGAI , Shinya IMURA , Yasutaka TSURUGA , Takaaki CHIBA , Hiroaki AMANO , Shinji NISHIKAWA , Akihiro NARAZAKI
IPC分类号： E02F9/22 , E02F9/26 , E02F9/20 , F15B13/044 , F15B13/02
摘要： A work machine that can keep the control accuracy of actuators irrespective of temperature variation of a hydraulic operating fluid that passes through flow rate controllers that control the flow rates of supply to the actuators is provided. For this purpose, the flow rate controllers each have a valve body that is disposed on a main hydraulic line connecting a delivery line of a hydraulic pump and the actuator and that moves according to an operation pressure from a solenoid proportional pressure reducing valve, a sampling hydraulic line that branches from the main hydraulic line, and a temperature sensor set on the sampling hydraulic line. The controller is configured to correct a command electrical signal to the solenoid proportional pressure reducing valve according to a signal from the temperature sensor.
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公开(公告)号：US20210340731A1
公开(公告)日：2021-11-04
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：US20210317636A1
公开(公告)日：2021-10-14
申请号：US17268717
申请日：2019-07-11
IPC分类号： E02F9/22 , F15B11/028 , F15B11/042 , F15B11/044 , F15B19/00
摘要： A construction machine that precisely enables derivation of the operation characteristics of hydraulic actuators in a high-velocity area with less calibration operation is provided. A controller (10) has a calibration mode in which the controller (10) derives operation characteristics (α(xs)) representing a relation among a spool position (xs) of a meter-in valve (8a1), an operation velocity (Va) of a hydraulic actuator (4a), and a differential pressure (ΔP) across the meter-in valve (8a1), and is configured to, in a case where the spool position (xs) of the meter-in valve (8a1) has changed in a direction to increase the opening area of the meter-in valve (8a1) in the calibration mode, output a command signal to increase the opening area of a bleed-off valve (8b1) to a bleed-off solenoid proportional pressure-reducing valve (8b2) as a command signal to reduce the differential pressure (ΔP).
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公开(公告)号：US20210254309A1
公开(公告)日：2021-08-19
申请号：US17252129
申请日：2019-03-28
发明人： Kento KUMAGAI , Shinya IMURA , Genroku SUGIYAMA , Katsuaki KODAKA , Yasutaka TSURUGA , Takaaki CHIBA
IPC分类号： E02F9/22
摘要： A work machine capable of driving each actuator more speedily and more accurately by ensuring high operability in a case of operator's manual operation, while accurately supplying a hydraulic fluid at a target flow rate to the actuator without depending on a load fluctuation in a case of automatic control over a machine body in response to a command input from a controller is provided.
The controller controls a plurality of auxiliary flow controllers in such a manner that supply flow rates to a plurality of directional control valves from hydraulic pumps fluctuate in response to load fluctuations of a plurality of hydraulic actuators in a case in which an instruction on invalidation of an area limiting control function is issued, and controls the plurality of auxiliary flow controllers in such a manner that the supply flow rates to the plurality of directional control valves from the hydraulic pumps do not fluctuate in response to the load fluctuations of the plurality of hydraulic actuators in a case in which an instruction on validation of the area limiting control function is issued.-
公开(公告)号：US20190338494A1
公开(公告)日：2019-11-07
申请号：US16074132
申请日：2016-11-17
IPC分类号： E02F9/22 , E02F3/43 , F15B11/028 , F15B11/044 , F15B11/17 , F15B11/08
摘要： The construction machine includes: a work implement driven by a first hydraulic actuator and a second hydraulic actuator; a first directional control valve controlling a flow rate and a direction of a hydraulic fluid supplied to the first hydraulic actuator; a first speed-up directional control valve provided in a second pump line and controlling a flow rate and a direction of a hydraulic fluid supplied to the first hydraulic actuator; a second directional control valve controlling a flow rate and a direction of a hydraulic fluid supplied to the second hydraulic actuator; an excavation load sensor that detects an excavation load imposed on the work implement; and a first speed-up control section that drives the first speed-up directional control valve, and the first speed-up control section is configured to control a driving amount of the first speed-up directional control valve in response to the excavation load.
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公开(公告)号：US20240344297A1
公开(公告)日：2024-10-17
申请号：US18683384
申请日：2022-10-31
发明人： Kento KUMAGAI , Shinya IMURA , Yasutaka TSURUGA , Takaaki CHIBA , Shinjirou YAMAMOTO , Hiroaki AMANO , Shinji NISHIKAWA , Akihiro NARAZAKI
IPC分类号： E02F9/22
CPC分类号： E02F9/2235 , E02F9/2296
摘要： The present invention intends to provide a work machine that can execute speed control of an actuator and torque control of a swing motor by a simple configuration at the time of combined operation to simultaneously drive the swing motor and the other actuator. For this purpose, a controller calculates a pump target flow rate on the basis of an actuator target flow rate and a swing target flow rate and calculates a target meter-in opening area of an actuator directional control valve on the basis of the actuator target flow rate, a pump pressure, and an actuator meter-in pressure. The controller calculates target torque of the swing motor on the basis of the input amount of operation devices and output values of posture sensors and calculates a swing target meter-out pressure on the basis of the target torque and a swing meter-in pressure. The controller calculates a target meter-out opening area of a swing directional control valve on the basis of the swing target meter-out pressure and a swing meter-out pressure.
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公开(公告)号：US20230323635A1
公开(公告)日：2023-10-12
申请号：US18023784
申请日：2021-12-17
IPC分类号： E02F9/22
CPC分类号： E02F9/2235 , E02F9/2246 , E02F9/2296
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.
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公开(公告)号：US20230323634A1
公开(公告)日：2023-10-12
申请号：US18025085
申请日：2021-12-15
IPC分类号： E02F9/22 , E02F9/20 , F15B13/044 , F15B15/26
CPC分类号： E02F9/2203 , E02F9/2296 , E02F9/2004 , F15B13/044 , F15B15/26 , E02F9/2285 , E02F9/2292 , F15B2211/426
摘要： The object of the invention of the present application resides in provision of a work machine that can be improved in operability at start of an action of a hydraulic actuator in a fine operation in which an operation lever is operated by a small amount. To this end, on the basis of a signal from a first timing sensor and a signal from a second timing sensor, a machine body controller controls, before the first timing is sensed, the pump delivery flow rate to a minimum delivery flow rate, controls, after the first timing is sensed but before the second timing is sensed, the pump delivery flow rate to a predetermined delivery flow rate that is greater than the minimum delivery flow rate, and controls, after the second timing is sensed, the pump delivery flow rate to a delivery flow rate according to an operation amount of the operation lever.
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公开(公告)号：US20230184265A1
公开(公告)日：2023-06-15
申请号：US17910521
申请日：2021-07-13
IPC分类号： F15B11/042 , E02F9/22 , E02F9/20 , F15B21/08
CPC分类号： F15B11/0423 , E02F9/2228 , E02F9/2282 , E02F9/2004 , E02F9/2296 , F15B21/082 , F15B21/087 , E02F3/435
摘要： A work machine includes: a hydraulic actuator that is driven by a hydraulic fluid from a hydraulic pump; an open-center directional control valve that is arranged on a center bypass line, and controls a flow of the hydraulic fluid to be supplied to the hydraulic actuator; a CB cut valve arranged between a directional control valve and a hydraulic working fluid tank on the center bypass line; and a machine controller that controls an opening of the CB cut valve. The machine controller restricts the opening of the CB cut valve when operation on the hydraulic actuator is in a fine operation state in which the operation on the hydraulic actuator is within a predetermined range representing a region of fine operation, and the fine operation state is continued longer than a predetermined period, and fully opens the CB cut valve otherwise.
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