公开(公告)号：US20240328121A1

公开(公告)日：2024-10-03

申请号：US18741365

申请日：2024-06-12

Applicant: KUBOTA CORPORATION ,  KYB CORPORATION

Inventor： Hiroshi HORII ,  Syunsuke FUKUDA

IPC: E02F9/22

CPC classification number: E02F9/2267 ,  E02F9/2285

Abstract: The control valve includes a valve body; a spool hole formed in the valve body; a spool slidably fitted in the spool hole; a pilot chamber into which a pilot fluid to actuate the spool is led; a discharge passage to discharge a hydraulic fluid to an outside of the valve body; a spiral groove to communicate with the discharge passage, the spiral groove being formed in a spiral shape on an outer periphery of the spool; and at least one axial groove to cause the pilot chamber and the spiral groove to communicate with each other, the axial groove being formed along an axial direction of the spool on an inner surface of the spool hole.

公开(公告)号：US20230324944A1

公开(公告)日：2023-10-12

申请号：US18205190

申请日：2023-06-02

Applicant: KUBOTA CORPORATION ,  KYB CORPORATION

Inventor： Hiroshi HORII ,  Tetsuya AOKI ,  Hirotaka KOBAYASHI

IPC: G05G5/06 ,  G05G5/05

CPC classification number: G05G5/05 ,  G05G5/065 ,  E02F9/2004 ,  G05G2505/00

Abstract: A neutral return mechanism includes an interlocking shaft to be pushed and pulled in an axial direction in conjunction with a swinging operation of an operation member; a housing member to support the interlocking shaft such that the interlocking shaft is movable in the axial direction and accommodate the interlocking shaft such that one of opposite end portions thereof protrudes; a neutral return spring to return the interlocking shaft from a post-movement position to an initial position, the neutral return spring being accommodated in the housing member such that the neutral return spring extends in the axial direction of the interlocking shaft, wherein the housing member includes a supported portion between a spring accommodation portion in which the neutral return spring is accommodated and a protrusion opening through which the interlocking shaft protrudes, the supported portion being supported at a bracket member.

公开(公告)号：US20240328119A1

公开(公告)日：2024-10-03

申请号：US18738273

申请日：2024-06-10

Applicant: KUBOTA CORPORATION

Inventor： Hiroshi HORII ,  Hiroya MORI

IPC: E02F9/22

CPC classification number: E02F9/2228 ,  E02F9/226

Abstract: A hydraulic system of a working machine includes a hydraulic actuator to be driven with a hydraulic fluid; a solenoid proportional valve to control the hydraulic actuator in accordance with a current that is supplied; and a controller to control the current that is supplied to the solenoid proportional valve. The controller changes a dither amplitude of the current that is supplied to the solenoid proportional valve in accordance with a temperature of the hydraulic fluid.

公开(公告)号：US20240328117A1

公开(公告)日：2024-10-03

申请号：US18738248

申请日：2024-06-10

Applicant: KUBOTA CORPORATION

Inventor： Hiroshi HORII ,  Hiroya MORI

IPC: E02F9/22 ,  F15B13/04 ,  F15B13/044

CPC classification number: E02F9/2203 ,  E02F9/2285 ,  F15B13/0401 ,  F15B13/044 ,  E02F9/2292 ,  E02F9/2296 ,  F15B2211/327

Abstract: A hydraulic system of a working machine includes a hydraulic actuator to be driven by a hydraulic fluid, a control valve to perform a switching operation for switching a flow rate of the hydraulic fluid supplied to the hydraulic actuator, and a controller to control the control valve. The control valve includes a solenoid and performs the switching operation in accordance with a current supplied to the solenoid. The controller supplies, to the solenoid, a shift current for causing the control valve to perform the switching operation and intermittently supplies a standby current when the shift current is not supplied, the standby current having a current value smaller than the shift current and within a range in which the control valve does not perform the switching operation.

公开(公告)号：US20230114311A1

公开(公告)日：2023-04-13

申请号：US18080364

申请日：2022-12-13

Applicant: KUBOTA CORPORATION

Inventor： Hiroshi HORII

IPC: E02F9/08 ,  B60K15/04

Abstract: To ease work of transferring a fuel from a fuel supply tank to a fuel tank, a fuel supply guide to be used to supply the fuel by using the fuel supply tank to the fuel tank having a tank body for storing the fuel and a fuel supply port on the upper side of the tank body includes a support member provided on an upper portion of the fuel tank, and a body member projecting from the support member in a direction away from the fuel supply port as the body member extends upward and projecting higher than the fuel supply port. The body member is capable of receiving the fuel supply tank by an upper portion thereof to support the fuel supply tank.

公开(公告)号：US20230112211A1

公开(公告)日：2023-04-13

申请号：US18079628

申请日：2022-12-12

Applicant: KUBOTA CORPORATION

Inventor： Hiroshi HORII

IPC: E02F9/22 ,  E02F9/20 ,  E02F3/32 ,  E02F3/42 ,  E02F3/43 ,  F15B13/02 ,  F15B15/00 ,  F15B13/06

Abstract: A working machine includes a machine body, a first hydraulic actuator mounted on the machine body, a first control valve that controls the first hydraulic actuator, a controller that controls the first control valve, and a second hydraulic actuator that is different from the first hydraulic actuator. When the second hydraulic actuator and the first hydraulic actuator are operated in combination, the controller reduces the amount of change in the flow rate of a hydraulic fluid supplied from the first control valve to the first hydraulic actuator with respect to changes in a manipulation amount to operate the first hydraulic actuator to a value smaller than that when the first hydraulic actuator is solely operated.

公开(公告)号：US20190309500A1

公开(公告)日：2019-10-10

申请号：US16448684

申请日：2019-06-21

Applicant: KUBOTA CORPORATION

Inventor： Hiroshi HORII

IPC: E02F9/26 ,  E02F9/20 ,  B60R1/00 ,  E02F9/24

Abstract: A working machine includes an operation device to conduct operations of the working machine, a control device to control the working machine between an operation allowable state and an operation restriction state, the operation allowable state allowing the working machine to be operated, the operation restriction state restricting the operations conducted by the operation device in comparison with the operation allowable state. The working machine includes a display device having a display portion and an input operation portion. The control device performs control under the operation restriction state when a predetermined input operation is conducted through the input operation portion.

公开(公告)号：US20220298744A1

公开(公告)日：2022-09-22

申请号：US17836111

申请日：2022-06-09

Applicant: KUBOTA CORPORATION

Inventor： Hiroshi HORII

IPC: E02F3/96 ,  E02F3/43 ,  E02F9/22

Abstract: A working machine includes a machine body, a dozer, a boom, an arm, a working tool, a boom cylinder, and an arm cylinder. The working machine also includes an arm crowd restricting unit and a crowd restriction releasing unit. The arm crowd restricting unit imposes a restriction on a stroke of the arm cylinder in an arm crowd direction so that a swing track of a distal end portion of the working tool is spaced from the boom cylinder. The crowd restriction releasing unit releases the restriction on the stroke of the arm cylinder to enable the arm to swing to an end of a swing range in the arm crowd direction when the boom is at a swing position at which the working tool in an operating position close to a working-tool dump position is disposed in a vicinity of a blade.

公开(公告)号：US20210285183A1

公开(公告)日：2021-09-16

申请号：US17332049

申请日：2021-05-27

Applicant: KUBOTA CORPORATION

Inventor： Hiroshi HORII

IPC: E02F3/43 ,  E02F3/32 ,  E02F9/20

Abstract: A working machine includes a machine body, a support bracket protruding forward from the machine body, a swing bracket pivotally supported by the support bracket to be capable of horizontally pivoting, a boom pivotally supported by the swing bracket to be capable of pivoting up and down, a swing sensor configured to detect a position of the swing bracket, and a controller configured to acquire a detection signal from the swing sensor and to control a swinging movement defined as a pivotal movement of the swing bracket. The controller includes a swinging stopper unit to stop the swinging movement when the swing bracket in the pivotal movement reaches a center position at which the boom is orientated in a forward direction of the machine body.

公开(公告)号：US20210270003A1

公开(公告)日：2021-09-02

申请号：US17325826

申请日：2021-05-20

Applicant: KUBOTA CORPORATION

Inventor： Hiroshi HORII ,  Hiroya MORI ,  Atsushi MATSUMOTO

IPC: E02F3/32 ,  E02F9/22 ,  E02F9/26 ,  F15B15/16

Abstract: A working machine, in which a detection device for detecting a swing position of a supported member is prevented from being damaged, includes a support member pivotally supporting the supported member via a pivot, and a cylinder telescopically moved by extension and contraction movement of its piston rod with respect to its cylinder tube by hydraulic fluid flowing through a fluid passage formed in the piston rod. The cylinder tube is pivotally supported by a first end portion of the support member, and the piston rod is pivotally supported by a second end portion of the support member. The detection device for detecting a telescopic movement state of the cylinder is provided between the cylinder and the support member.