公开(公告)号：US20210123212A1

公开(公告)日：2021-04-29

申请号：US17076282

申请日：2020-10-21

Applicant: KUBOTA CORPORATION

Inventor： Masahiro TOYAMA ,  Ryuki NISHIMOTO ,  Yuji FUKUDA ,  Kohei NAGAO ,  Ryota HAMAMOTO ,  Hiroaki NAKAGAWA

IPC: E02F9/22 ,  E02F9/20

Abstract: A working machine includes a hydraulic device, an operation valve to supply operation fluid to operate the hydraulic device and to vary the operation fluid to be supplied to the hydraulic device, an operation device having an operation member supported swingably, the operation device being configured to output an operation signal in accordance with an operation amount of the operation member, and a controller including a swing calculator to calculate an evaluation value representing a degree of swinging of the operation member, and a control signal generator to generate a control signal based on the evaluation value and the operation signal.

公开(公告)号：US20220018094A1

公开(公告)日：2022-01-20

申请号：US17487676

申请日：2021-09-28

Applicant: KUBOTA CORPORATION

Inventor： Ryuki NISHIMOTO ,  Teruhiko IWAMOTO ,  Tsutomu AIZAWA ,  Makoto NOGUCHI

IPC: E02F9/22 ,  F15B11/16

Abstract: The working machine includes a traveling device, a traveling motor, a hydraulic pump including a swashplate, a prime mover to drive the hydraulic pump, a first servo-cylinder to set an angle of the swashplate, a charge pump to supply pilot fluid to the first servo-cylinder, a switching valve shiftable between a traveling position to supply the pilot fluid from the charge pump to the first servo-cylinder and a neutral position to stop the pilot fluid supply to the first servo-cylinder, a switching operation member operable to select either a traveling mode or a neutral mode, and a controller to shift the switching valve between the traveling position and the neutral position. The controller holds the switching valve at the neutral position after the switching operation member is operated to select the traveling mode until a rotation speed of the prime mover becomes not less than a first predetermined rotation speed.

公开(公告)号：US20240052597A1

公开(公告)日：2024-02-15

申请号：US18231856

申请日：2023-08-09

Applicant: KUBOTA CORPORATION

Inventor： Kohei NAGAO ,  Yuji FUKUDA ,  Ryuki NISHIMOTO

IPC: E02F9/22 ,  F15B13/06

CPC classification number: E02F9/2228 ,  E02F9/2285 ,  F15B13/06 ,  E01H1/056

Abstract: A hydraulic system for a working machine includes first and second hydraulic actuators actuated by hydraulic fluid delivered by a hydraulic pump, a first flow rate controller to control a first supply flow rate of hydraulic fluid supplied to the first hydraulic actuator to match a first required flow rate, a second flow rate controller to control a second supply flow rate of hydraulic fluid supplied to the second hydraulic actuator to match a second required flow rate, and a special flow rate control system to, if a sum of the first and second required flow rates is greater than a maximum delivery flow rate of the hydraulic pump, reduce the first supply flow rate to allow the second supply flow rate to approach the second required flow rate.

公开(公告)号：US20180180068A1

公开(公告)日：2018-06-28

申请号：US15854134

申请日：2017-12-26

Applicant: KUBOTA CORPORATION

Inventor： Yuji FUKUDA ,  Keigo HONDA ,  Ryosuke KINUGAWA ,  Ryuki NISHIMOTO ,  Yuji YAMASHITA ,  Daisuke SAKURAI

IPC: F15B13/02 ,  E02F9/22 ,  F15B1/26 ,  E02F3/34 ,  F15B1/02

CPC classification number: F15B13/021 ,  E02F3/3414 ,  E02F9/2203 ,  E02F9/2207 ,  E02F9/2217 ,  E02F9/2267 ,  F15B1/02 ,  F15B1/26 ,  F15B11/08 ,  F15B21/0427 ,  F15B2201/411 ,  F15B2211/30565 ,  F15B2211/3127 ,  F15B2211/31558 ,  F15B2211/329 ,  F15B2211/625 ,  F15B2211/635 ,  F15B2211/66 ,  F15B2211/6658 ,  F15B2211/8613 ,  F15B2211/8616 ,  F15B2215/30 ,  F16L55/04

Abstract: A hydraulic system for a working machine includes a hydraulic actuator having a first fluid chamber and a second fluid chamber, an accumulator, an outputting fluid tube to output an operation fluid, and a switching valve to be switched between a first position and a second position. The first position allows the first fluid chamber and the second fluid chamber to be communicated with the outputting fluid tube and thereby allowing a floating operation. The second position allows the first fluid chamber and the accumulator to be communicated with each other, allows the second fluid chamber and the outputting fluid tube to be communicated with each other, and thereby allows an anti-vibration operation.

公开(公告)号：US20250084610A1

公开(公告)日：2025-03-13

申请号：US18882767

申请日：2024-09-12

Applicant: KUBOTA CORPORATION

Inventor： Ken OMAE ,  Ryuki NISHIMOTO ,  Ken UNO

IPC: E02F3/43 ,  E02F9/22

Abstract: A work vehicle includes a memory configured to store first information corresponding to a reference direction which is a standard of an implement direction, and second information corresponding to a reference height which is a standard of an arm height, an input device configured to receive an instruction to perform automatic control for changing the implement direction and the arm height respectively to the reference direction and the reference height, and control circuitry configured to control the hydraulic circuit so that the arm height and the implement direction respectively approach the reference height and the reference direction in response to the instruction received by the input device. The control circuitry is configured to control a hydraulic circuit so that during the automatic control, the implement direction is changed to the reference direction when the arm height reaches a target height which is greater than the reference height.

公开(公告)号：US20200048868A1

公开(公告)日：2020-02-13

申请号：US16432042

申请日：2019-06-05

Applicant: KUBOTA CORPORATION

Inventor： Ryuki NISHIMOTO ,  Yuji FUKUDA ,  Jun TOMITA

IPC: E02F9/22 ,  F15B11/10 ,  F15B13/04 ,  F15B13/042

Abstract: A hydraulic system includes a control device to reduce a first movement speed to be lower than a second movement speed, the first movement speed being a speed at which a spool of a first control valve moves from a first supply position to a first stop position under a state where a second control valve is in the second supply position, the second movement speed being a speed at which the spool moves from the first supply position to the first stop position under a state where the second control valve is in the second stop position. The first supply position allows operation fluid to be supplied to a hydraulic actuator. The first stop position prevents the operation fluid from being supplied to the hydraulic actuator. The second stop position prevents the operation fluid from being supplied to a first fluid tube coupling a hydraulic pump to the hydraulic actuator.

公开(公告)号：US20250109573A1

公开(公告)日：2025-04-03

申请号：US18900252

申请日：2024-09-27

Applicant: Kubota Corporation

Inventor： Daiki ABE ,  Yuki BUNRYO ,  Ryuki NISHIMOTO

IPC: E02F9/22

Abstract: A working machine includes a pump actuated by power from a prime mover to deliver hydraulic fluid, a working unit including a working device and an attachment to perform work upon actuation, by hydraulic fluid, of actuator(s) included in the working device and/or the attachment, a solenoid valve to change a flow rate of hydraulic fluid to the actuator(s) based on a control signal, a controller to input the control signal into the valve, an accelerator to input a target rotation speed of the prime mover, and a rotation speed sensor to detect an actual rotation speed of the prime mover. The controller is configured or programmed to, during high-load work, if a decrease in actual rotation speed relative to the target rotation speed reaches a threshold or greater, change the control signal based on the actual rotation speed to limit the flow rate of hydraulic fluid to the actuator(s).

公开(公告)号：US20250084611A1

公开(公告)日：2025-03-13

申请号：US18884118

申请日：2024-09-13

Applicant: KUBOTA CORPORATION

Inventor： Ken OMAE ,  Ryuki NISHIMOTO ,  Ken UNO

IPC: E02F3/43 ,  E02F9/22 ,  E02F9/26

Abstract: A work vehicle includes a processor configured to: calculate a first posture parameter representing a start arm height and a second posture parameter representing a start implement direction; acquire a first reference parameter that is a second posture parameter associated with the first posture parameter representing the start arm height in first relational data; obtain a measurement value of the arm height; acquire a second reference parameter that is a second posture parameter associated with the first posture parameter representing the measurement value in the first relational data; determine a target direction when the arm height is the measurement value such that a difference between the second posture parameter representing the target direction and the second posture parameter representing the start implement direction is equal to a difference between the second reference parameter and the first reference parameter; and control such that the implement direction approaches the target direction.

公开(公告)号：US20200056520A1

公开(公告)日：2020-02-20

申请号：US16661448

申请日：2019-10-23

Applicant: KUBOTA CORPORATION

Inventor： Ryuki NISHIMOTO ,  Keisuke MIURA ,  Ryosuke KINUGAWA

IPC: F01N3/023 ,  B01D46/42

Abstract: A working machine includes a manual switch, a filter to catch particulate matters included in exhaust gas that is exhausted from a prime mover, a first cleaning controller to perform automatic cleaning that automatically combusts the particulate matters when a deposits amount of the particulate matters caught by the filter is a first deposits amount threshold or more, a second cleaning controller to perform manual cleaning that combusts the particulate matters based on a command of the manual switch when the deposits amount is equal to or more than a second deposits amount threshold that is larger than the first deposits amount threshold, and a third cleaning controller to perform assist cleaning that combusts the particulate matters based on the command of the manual switch when the deposits amount is equal to or more than the first deposits amount threshold and smaller than the second deposits amount threshold.