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公开(公告)号：US20250135813A1
公开(公告)日：2025-05-01
申请号：US18386105
申请日：2023-11-01
Applicant: KUBOTA CORPORATION
Inventor： Yuji FUKUDA , Ryota HAMAMOTO
Abstract: A working vehicle includes a hitch, operation switch(es) to be operated to attach/detach the attachment to/from the hitch, a receiver to receive a signal from a transmitter in/on the attachment, and a controller to perform a process based on the identification information in the signal. The hitch includes a latching mechanism operable in a latching state and an unlatching state, and a latch actuator to actuate the latching mechanism while the operation switch(es) is being operated. The controller is configured or programmed to, when the operation switch(es) is operated continuously for a first period or more or a second period or more, determine that the attachment is allowed to be detached or is attached and start the process, the first period being time taken for the latching mechanism to switch to the unlatching state, the second period being time taken for the latching mechanism to switch to the latching state.
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公开(公告)号：US20240337092A1
公开(公告)日：2024-10-10
申请号：US18131423
申请日：2023-04-06
Applicant: KUBOTA CORPORATION
Inventor： Ryota HAMAMOTO , Yuji FUKUDA , Tomoyuki NOGUCHI , Kohei NAGAO
CPC classification number: E02F9/2228 , E02F3/96 , E02F9/2004 , E02F9/2025 , E02F9/2267 , E02F9/26 , F15B15/20 , F15B19/00 , E02F9/2285 , E02F9/2292 , E02F9/2296 , F15B2211/426
Abstract: A working machine includes a controller to: select one of pieces of operation characteristics information corresponding to respective work attachments stored in a memory that corresponds to a work attachment attached to an attachment mount portion and fluidly connected to a hydraulic fluid port; and control, based on the selected one of the pieces of operation characteristics information, the speed of switching of a work-attachment-drive control valve when starting the work attachment and/or when stopping the work attachment.
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公开(公告)号：US20240336301A1
公开(公告)日：2024-10-10
申请号：US18748978
申请日：2024-06-20
Applicant: KUBOTA CORPORATION
Inventor： Yuji FUKUDA , Kohei NAGAO
CPC classification number: B62D11/04 , E02F3/3414 , E02F9/2004 , E02F9/2235 , E02F9/2253 , E02F9/2292 , E02F9/2296 , F15B15/02 , F16H61/47
Abstract: A working machine includes a first rotation detector to detect a first rotation speed of the left traveling motor, a second rotation detector to detect a second rotation speed of the right traveling motor, and a controller to perform automatic deceleration to automatically reduce the first rotation speed and the second rotation speed both set at respective second speed stages by shifting a speed stage of each of the first rotation speed and the second rotation speed to a first speed stage that is lower than the second speed stage. During straight traveling of a machine body of the working machine, the controller determines a straight-traveling threshold serving as a deceleration threshold for judging whether to perform the automatic deceleration based on the first rotation speed or the second rotation speed.
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公开(公告)号：US20230383499A1
公开(公告)日：2023-11-30
申请号：US18233010
申请日：2023-08-11
Applicant: KUBOTA CORPORATION
Inventor： Yuji FUKUDA , Jun TOMITA , Ryota HAMAMOTO , Ryosuke KINUGAWA , Yoshimitsu TANAKA
IPC: E02F9/22 , E02F9/02 , E02F9/24 , F16H61/456 , B62D55/06
CPC classification number: E02F9/2253 , E02F9/02 , E02F9/2275 , E02F9/2292 , E02F9/24 , F16H61/456 , B62D55/06 , B62D11/04
Abstract: A working machine is provided, which includes a machine body, a prime mover, a pair of traveling devices, a pair of traveling motors to be switched between a first speed and a second speed higher than the first speed, a pair of traveling pumps driven by the prime mover to supply operation fluid to the pair of traveling motors, respectively, a controller configured to automatically shift down the pair of traveling motors from the second speed to the first speed, a mode switch configured for an operator to select an ON position allowing the controller to automatically shift down the first traveling motor from the second speed to the first speed and an OFF position preventing the controller to automatically shift down the first traveling motor from the second speed to the first speed, and a display to display that the operator selects the ON position of the mode switch.
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公开(公告)号：US20230203789A1
公开(公告)日：2023-06-29
申请号：US17946047
申请日：2022-09-16
Applicant: Kubota Corporation
Inventor： Yuji FUKUDA , Hiroaki NAKAGAWA , Ryota HAMAMOTO , Yasuhiro NISHIDA , Daiki ABE
CPC classification number: E02F9/226 , F01P7/044 , E02F9/2296
Abstract: A control method for a fan of a work vehicle includes supplying, when an engine is started, a first current to a solenoid of a variable relief valve such that the hydraulic fluid flows by a first flow rate, supplying, when a rotational speed of the engine becomes larger than a first rotational speed threshold value, a second current larger than the first current to the solenoid such that the hydraulic fluid flows by a second flow rate smaller than the first flow rate to reduce the rotational speed of the fan, and supplying, when the rotational speed of the engine becomes larger than a second rotational speed threshold value that is larger than the first rotational speed threshold value, a current to the solenoid to change the rotational speed of the fan, the current corresponding to a temperature of liquid flowing in the work vehicle.
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Patent Agency Ranking
公开(公告)号：US20230051323A1
公开(公告)日：2023-02-16
申请号：US17840679
申请日：2022-06-15
Applicant: KUBOTA CORPORATION
Inventor： Kohei NAGAO , Yuji FUKUDA , Ryota HAMAMOTO
IPC: E02F9/22
Abstract: 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：US20220341130A1
公开(公告)日：2022-10-27
申请号：US17861915
申请日：2022-07-11
Applicant: KUBOTA CORPORATION
Inventor： Masahiro TOYAMA , Yuji FUKUDA
Abstract: A working machine comprises an operation member for operating a hydraulic device via a control valve. An oscillation calculator acquires a specific value corresponding to a feature representing oscillation of the operation member when the feature appears in variation of an control signal output according to an operation amount of the operation member within one of a sequence of predetermined periods, and calculates an evaluation value representing a degree of oscillation of the operation member by adding up the specific value or values obtained within one or more of the predetermined periods. A control signal generator generates a control signal for controlling the control valve based on the operation signal. The control signal generator decreases a value of the control signal per a unit value of the operation signal as the evaluation value gradually increases with the elapse of one or more of the sequence of the predetermined periods.
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公开(公告)号：US20220341128A1
公开(公告)日：2022-10-27
申请号：US17860279
申请日：2022-07-08
Applicant: KUBOTA CORPORATION
Inventor： Yuji FUKUDA , Kazuyoshi ARII
Abstract: A hydraulic system for a work machine, which includes a first hydraulic pump to deliver operation fluid, a second hydraulic pump to deliver pilot fluid, a first hydraulic actuator configured to control flow rate of the operation fluid based on the pilot pressure applied to the pressure receivers, a manual operator configured to operate the first hydraulic actuator, having an operation lever to move toward both directions, operation valves to change pressure of the pilot fluid in accordance with movement of the operation lever, and a discharge fluid tube to drain the pilot fluid from the operation valves. The hydraulic system includes an actuating valve in the discharge fluid tube and configured to reduce pressure of the pilot fluid in the discharge fluid tube.
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公开(公告)号：US20220298754A1
公开(公告)日：2022-09-22
申请号：US17833549
申请日：2022-06-06
Applicant: KUBOTA CORPORATION
Inventor： Yuji FUKUDA , Keigo HONDA
Abstract: A control valve of hydraulic system for a working machine is provided, which includes a main body and a spool. The main body includes first, second, third, fourth and fifth ports, and first second, third, fourth and fifth inner fluid paths connected to the first, second, third, fourth and fifth ports, respectively. The spool is configured to move between a neutral position and a communicating position allowing fluid communication between the second inner fluid path and the fifth inner fluid path or between the first inner fluid path and the fifth inner fluid path. The spool includes a communicating hole configured to allow the fluid communication between the second port and the fourth port, or between the first port and the fourth port, when the spool is in a position between the communicating position and the neutral position.
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公开(公告)号：US20200048859A1
公开(公告)日：2020-02-13
申请号：US16430969
申请日：2019-06-04
Applicant: KUBOTA CORPORATION
Inventor： Daiki ABE , Yuji FUKUDA , Yuya KONISHI , Keigo HONDA , Hiroya HANANO , Jun TOMITA
Abstract: A hydraulic system for a working machine, includes an operation member, an operation valve to change an output pressure of an operation fluid in accordance with operation of the operation member, a hydraulic device to be activated by the operation fluid outputted from the operation valve, a first fluid tube coupling the operation valve to the hydraulic device, and a bleed circuit connected to the first fluid tube and configured to output the operation fluid in the first fluid tube. The first fluid tube includes a first section fluid tube arranged in a section between the operation valve and a coupling portion coupling the first fluid tube to the bleed circuit, and a second section fluid tube arranged in a section between the coupling portion and the hydraulic device, the second section fluid tube having an inner diameter different from an inner diameter of the first section fluid tube.
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