公开(公告)号：US11248668B2

公开(公告)日：2022-02-15

申请号：US16950328

申请日：2020-11-17

Applicant: KUBOTA CORPORATION

Inventor： Hitoshi Azuma ,  Tetsuo Yamaguchi ,  Shinji Ohara

IPC: F16D48/06 ,  F16H61/06 ,  B60K23/08

Abstract: A working vehicle includes a first hydraulic clutch connected to the first traveling shaft, a second hydraulic clutch connected to the first traveling shaft separately from the first hydraulic clutch, a first gear mechanism to transmit, to a second traveling shaft, power from the first hydraulic clutch when the first hydraulic clutch is engaged and not to transmit, to the second traveling shaft, power from the first hydraulic clutch when the first hydraulic clutch is disengaged, and a second gear mechanism to transmit, to the second traveling shaft, power from the second hydraulic clutch when the second hydraulic clutch is engaged and not to transmit, to the second traveling shaft, power from the second hydraulic clutch when the second hydraulic clutch is disengaged.

公开(公告)号：US11247557B2

公开(公告)日：2022-02-15

申请号：US16893490

申请日：2020-06-05

Applicant: KUBOTA CORPORATION

Inventor： Hitoshi Azuma ,  Tetsuo Yamaguchi ,  Shinji Ohara ,  Yoshihiko Kuroshita ,  Michita Kono

IPC: B60K17/28 ,  B60K17/02 ,  B60K17/10 ,  F16D67/04 ,  B60K25/06

Abstract: A working vehicle includes a PTO shaft to transmit power of a propulsion shaft, a PTO clutch including a first rotor to be rotated by the power of the propulsion shaft, a second rotor to transmit the power to the PTO shaft, a press to be moved by a pressure of operation fluid between an engaging side on which the first rotor is engaged with the second rotor and a disengaging side, and a PTO brake to brake the PTO shaft when the press is positioned on the disengaging side, a control valve to control the pressure of the operation fluid to be applied to the PTO clutch, a rate setter to set a reducing rate at which the pressure of the operation fluid is reduced, and a controller to control the control valve based on the reducing rate.

公开(公告)号：US11739501B2

公开(公告)日：2023-08-29

申请号：US17341472

申请日：2021-06-08

Applicant: KUBOTA CORPORATION

Inventor： Hitoshi Azuma

IPC: E02F9/20 ,  E02F9/22

CPC classification number: E02F9/2083 ,  E02F9/2062 ,  E02F9/2079 ,  E02F9/2253

Abstract: A working vehicle includes a prime mover, a traveling device, a traveling clutch switchable between an engaged state to transmit, to the traveling device, power provided from the prime mover and a disengaged state to interrupt the power transmitting to the traveling device, an automatic switching controller to switch the traveling clutch from the disengaged state to the engaged state, and a status detector to detect at least either a status of the prime mover or a status of the traveling device. The automatic switching controller changes a switching speed of the traveling clutch switched from the disengaged state to the engaged state based on the status detected by the status detector.

公开(公告)号：US11674593B2

公开(公告)日：2023-06-13

申请号：US17496333

申请日：2021-10-07

Applicant: KUBOTA CORPORATION

Inventor： Hitoshi Azuma ,  Michita Kono ,  Hiroshi Sota

IPC: F16H61/16 ,  F16H59/36 ,  F16H61/32 ,  F16H3/00

CPC classification number: F16H61/16 ,  F16H59/36 ,  F16H61/32 ,  F16H2003/008 ,  F16H2306/24

Abstract: A working vehicle includes: a vehicle body; a linkage device configured to link a working device to the vehicle body; a prime mover provided on the vehicle body; a traveling device configured to cause the vehicle body to travel; a transmission device configured to transmit power from the prime mover to the traveling device and perform a speed change process to change a speed of the vehicle body; an increase-in-speed detection device configured to detect an increase in speed of the vehicle body; and a speed change restraint unit configured such that, during the speed change process performed by the transmission device, when the increase in speed detected by the increase-in-speed detection device has become equal to or greater than a threshold, the speed change restraint unit stops the speed change process performed by the transmission device.

公开(公告)号：US11268614B2

公开(公告)日：2022-03-08

申请号：US16893491

申请日：2020-06-05

Applicant: KUBOTA CORPORATION

Inventor： Yoshihiko Kuroshita ,  Tetsuo Yamaguchi ,  Michita Kono ,  Hitoshi Azuma ,  Shinji Ohara

IPC: F16H61/16 ,  B60K17/02 ,  F16H59/54 ,  F16H61/21

Abstract: A working vehicle includes a traveling clutch to be switched between an engaging state and a disengaging state, a brake to brake the traveling device according to an operation of a brake operator, and a controller to perform a braking control to perform the braking, and an auto-switching controller to switch the traveling clutch from the engaging state to the disengaging state. The controller performs a first processing to switch the traveling clutch from the engaging state to the disengaging state when the brake operator is operated in a case where the auto-switching control is valid and a vehicle speed is less than a threshold, and a second processing to prevent the traveling clutch from being switched from the engaging state to the disengaging state even when the brake operator is operated in a case where the vehicle speed is equal to or higher than the threshold.