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公开(公告)号：US20230051323A1
公开(公告)日：2023-02-16
申请号：US17840679
申请日：2022-06-15
申请人： KUBOTA CORPORATION
发明人： Kohei NAGAO , Yuji FUKUDA , Ryota HAMAMOTO
IPC分类号： E02F9/22
摘要： A hydraulic system for a working machine includes a traveling motor to output power to a traveling device in the working machine, a first detector to detect a physical quantity that changes in accordance with a traveling state of the working machine and that is detected at intervals of a predetermined period, and a controller to execute automatic shift-down to automatically reduce a rotational speed of the traveling motor to a first speed stage when the rotational speed of the traveling motor is in a second speed stage higher than the first speed stage. The controller is configured or programmed to determine a tendency or degree of change in the physical quantity, based on values of the physical quantity detected at intervals of the predetermined period by the first detector.
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公开(公告)号：US20240026648A1
公开(公告)日：2024-01-25
申请号：US18374772
申请日：2023-09-29
申请人： KUBOTA CORPORATION
发明人： Yuji FUKUDA , Kohei NAGAO , Hiroaki NAKAGAWA , Ryota HAMAMOTO
IPC分类号： E02F9/22 , F16H61/448 , F16H61/4157 , F16H61/444 , F16H61/421 , F16H61/02
CPC分类号： E02F9/2246 , E02F9/226 , E02F9/2253 , E02F9/2296 , F16H61/448 , F16H61/4157 , F16H61/444 , F16H61/421 , F16H61/0206
摘要： A working machine includes a prime mover, a traveling device, a traveling motor, a traveling pump, a circulation fluid passage, a traveling switching valve shiftable between a first state corresponding to a first speed of a hydraulic motor and a second state corresponding to a second speed of the hydraulic motor, a brake, an actuation valve configured to output the hydraulic pressure applied to the traveling pump, and change the hydraulic pressure output therefrom, and a controller configured or programmed to control the traveling switching valve, the brake and the actuation valve, and being capable of activating a first mode. The controller is configured or programmed to, when activating the first mode, shift the brake into a braking state, shift the traveling switching valve into the second state, and control the actuation valve so as to set the hydraulic pressure output from the actuation valve to a predetermined pressure.
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公开(公告)号：US20230228062A1
公开(公告)日：2023-07-20
申请号：US18075917
申请日：2022-12-06
申请人： KUBOTA CORPORATION
发明人： Ryota HAMAMOTO , Kazuki UEDA , Daiki ABE
CPC分类号： E02F9/2228 , E02F9/2004 , E02F9/2246 , E02F9/2253 , E02F9/2267 , E02F9/2285 , E02F9/2292
摘要： A working machine includes a controller that performs shift shock reduction control when shift-down switching from a second state to a first state, in which a motor speed can be increased up to a first maximum speed lower than a second maximum speed available in the second state, is performed. The controller includes a first processor configured to, based on a drop amount that is a difference between target and actual numbers of revolutions of a prime mover, compute a first reduction amount for reducing an amount of hydraulic fluid supply from a traveling pump to a traveling motor, a second processor configured to compute a second reduction amount based on a degree of straight traveling of a machine body, and a reduction controller configured to, based on the first or second reduction amount, whichever is larger in absolute value, perform the shift shock reduction control.
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公开(公告)号：US20230193595A1
公开(公告)日：2023-06-22
申请号：US18074177
申请日：2022-12-02
申请人： KUBOTA CORPORATION
发明人： Kazuki UEDA , Yuji FUKUDA , Ryota HAMAMOTO
CPC分类号： E02F9/2253 , E02F9/2267 , E02F9/2004 , F15B15/18 , E02F9/2285 , E02F9/2292 , E02F9/2296
摘要： In a working machine, a controller decreases a supply amount of hydraulic fluid from a travel pump to a travel motor based on a travel state of a machine body when a speed-change instruction is issued by operating a switch. When a speed-increase operation is performed, the controller switches the travel switching valve from the first state to the second state in a prior period lasting up to when the supply amount to the travel motor starts decreasing, in a restoration period in which the supply amount to the travel motor after being decreased is being restored, or in an after-restoration period in which the supply amount has been restored.
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公开(公告)号：US20230044116A1
公开(公告)日：2023-02-09
申请号：US17844071
申请日：2022-06-20
申请人： Kubota Corporation
发明人： Daiki ABE , Ryota HAMAMOTO , Yuki BUNRYO
摘要： A method for controlling a work vehicle includes driving a first hydraulic pump and a second hydraulic pump by an engine to supply hydraulic fluid to a first hydraulic motor and a second hydraulic motor, respectively, to drive a first traveling device and a second traveling device, respectively. An operation state of a direction input device to operate a traveling direction of the work vehicle is detected. Based on the operation state detected, whether or not a traveling state of the work vehicle is a turning state. When it is determined that the traveling state is the turning state, a rotation command to decrease a target rotational speed of the engine from a first rotational speed to a second rotational speed is output.
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公开(公告)号：US20220120057A1
公开(公告)日：2022-04-21
申请号：US17551687
申请日：2021-12-15
申请人： KUBOTA CORPORATION
发明人： Yuji FUKUDA , Ryosuke KINUGAWA , Ryota HAMAMOTO , Jun TOMITA
摘要： A working machine includes a prime mover, a traveling pump to be driven by the prime mover to output operation fluid, a traveling motor to be driven by the operation fluid outputted from the traveling pump and to change a motor speed between a first speed and a second speed higher than the first speed, a machine body on which the prime mover, the traveling pump, and the traveling motor are arranged, a traveling switching valve to be switched between a first state allowing the traveling motor to rotate at the first speed and a second state allowing the traveling motor to rotate at the second speed, and a controller to reduce a revolving speed of the prime mover based on a traveling condition of the machine body in switching the traveling switching valve between an accelerating state to switch the traveling switching valve from the first state to the second state and a decelerating state to switch the traveling switching valve from the second state to the first state.
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公开(公告)号：US20200318320A1
公开(公告)日：2020-10-08
申请号：US16838266
申请日：2020-04-02
申请人： KUBOTA CORPORATION
发明人： Yuji FUKUDA , Jun TOMITA , Ryota HAMAMOTO , Ryosuke KINUGAWA , Yoshimitsu TANAKA
IPC分类号： E02F9/22 , E02F9/02 , B62D55/06 , E02F9/24 , F16H61/456
摘要： A working machine includes a pair of traveling devices, a pair of traveling motors having a first speed and a second speed higher than the first speed, a pair of traveling pumps to supply operation fluid to the traveling motors, a connector fluid tube connecting the traveling motors and the traveling pumps, a traveling-pump pressure detector to detect a traveling-pump pressure that is pressure generated in the connector fluid tube, a revolving speed detector to detect a prime-mover revolving speed, a third storage to store a second decelerating judgment table representing a relation between the prime-mover revolving speed and a second decelerating judgment pressure, and a controller having: an automatic decelerator portion to perform an automatic deceleration process for reducing a speed of the traveling motor, and a differential pressure calculator portion to calculate a traveling differential pressure between one traveling pump pressure and another traveling pump pressure.
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公开(公告)号：US20200263393A1
公开(公告)日：2020-08-20
申请号：US16793364
申请日：2020-02-18
申请人： KUBOTA CORPORATION
发明人： Yuji FUKUDA , Ryosuke KINUGAWA , Ryota HAMAMOTO , Jun TOMITA
IPC分类号： E02F9/22
摘要： A working machine includes a prime mover, a traveling pump to be driven by the prime mover to output operation fluid, a traveling motor to be driven by the operation fluid outputted from the traveling pump and to change a motor speed between a first speed and a second speed higher than the first speed, a machine body on which the prime mover, the traveling pump, and the traveling motor are arranged, a traveling switching valve to be switched between a first state allowing the traveling motor to rotate at the first speed and a second state allowing the traveling motor to rotate at the second speed, and a controller to reduce a revolving speed of the prime mover based on a traveling condition of the machine body in switching the traveling switching valve between an accelerating state to switch the traveling switching valve from the first state to the second state and a decelerating state to switch the traveling switching valve from the second state to the first state.
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