公开(公告)号：US20250003485A1

公开(公告)日：2025-01-02

申请号：US18753114

申请日：2024-06-25

Applicant: Kubota Corporation

Inventor： Tetsuo YAMAGUCHI ,  Komei YAMAWAKI ,  Mizuki UENO

IPC: F16H61/08 ,  F16H59/36 ,  F16H59/38 ,  F16H59/46 ,  F16H59/68 ,  F16H59/70 ,  F16H59/72 ,  F16H61/06 ,  F16H61/30

Abstract: A control system to control an operation of a power transmission of a work vehicle includes a storage to store data indicating a relationship between a ratio between a rotational speed of a predetermined component on a power transmission path to transmit the rotation of the planetary transmission to wheels and a rotational speed of the internal combustion engine, and switching points at which the transmission gear of the planetary transmission is switched, and a controller to control the hydraulic clutch mechanism to perform switching of the transmission gear. Where the transmission gear is switched when the ratio changes to reach a first value corresponding to a first switching point or after the ratio reaches the first value, the controller controls the hydraulic clutch mechanism so as to start hydraulic fluid charging to perform switching of the transmission gear before the ratio reaches the first value.

公开(公告)号：US20210259147A1

公开(公告)日：2021-08-26

申请号：US17173227

申请日：2021-02-11

Applicant: KUBOTA CORPORATION

Inventor： Tetsuo YAMAGUCHI ,  Takudai MATSUDA

IPC: A01B63/10 ,  A01B59/06 ,  A01B63/118 ,  A01B76/00

Abstract: A work vehicle includes a lifting mechanism to control at least one of a height and a posture of a work machine connected to the work vehicle. The lifting mechanism is able to control at least one of the height and the posture by using a hydraulic drive. The work vehicle includes an oil-temperature acquirer to acquire an oil temperature to be used for the hydraulic drive, a maximum oil amount setter to set a maximum oil amount according to the oil temperature acquired by the oil-temperature acquirer, the maximum oil amount being a maximum value of a supply amount of oil used to drive the hydraulic drive, and a hydraulic drive controller to control the hydraulic drive below the maximum oil amount set by the maximum oil amount setter.

公开(公告)号：US20210164561A1

公开(公告)日：2021-06-03

申请号：US16950328

申请日：2020-11-17

Applicant: KUBOTA CORPORATION

Inventor： Hitoshi AZUMA ,  Tetsuo YAMAGUCHI ,  Shinji OHARA

IPC: F16H61/06 ,  F16D48/02 ,  F16H59/56

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：US20220196128A1

公开(公告)日：2022-06-23

申请号：US17514284

申请日：2021-10-29

Applicant: KUBOTA CORPORATION

Inventor： Tetsuo YAMAGUCHI ,  Ryoma IWASE ,  Komei YAMAWAKI

IPC: F16H47/04 ,  F16H61/431

Abstract: A work vehicle includes an engine, a speed changing apparatus that includes a hydrostatic stepless speed changing mechanism and is configured to subject motive power transmitted from the engine to speed changing and output the motive power, a travelling apparatus configured to travel on the motive power received from the speed changing apparatus, a speed detector configured to detect a speed of the travelling apparatus, a pressure detector configured to detect a hydraulic pressure in a closed circuit of the hydrostatic stepless speed changing mechanism, and a controller.

公开(公告)号：US20240167565A1

公开(公告)日：2024-05-23

申请号：US18380224

申请日：2023-10-16

Applicant: KUBOTA CORPORATION

Inventor： Tetsuo YAMAGUCHI ,  Ryoma IWASE

IPC: F16H61/431 ,  F16H47/04

CPC classification number: F16H61/431 ,  F16H47/04

Abstract: An electromagnetic valve control device includes a control signal generator to, through feedback control involving an environmental coefficient, generate a control signal intended for at least one electromagnetic valve and corresponding to a target electric current value, a coefficient determiner to determine an environmental coefficient during a learning period from a start of a driver operation to an end of a predetermined time, and an operation limiter to limit respective operations of the at least one electromagnetic valve and a gear transmission during the learning period.

公开(公告)号：US20240167549A1

公开(公告)日：2024-05-23

申请号：US18503414

申请日：2023-11-07

Applicant: KUBOTA CORPORATION

Inventor： Tetsuo YAMAGUCHI ,  Ryoma IWASE ,  Tomonari TSUCHIDA

IPC: F16H37/08

CPC classification number: F16H37/084 ,  F16H2037/0886

Abstract: A continuously variable powertrain device for a work vehicle includes a continuously variable transmission to output a continuously shifted motive power while continuously varying a speed of a motive power received from an engine, a planetary transmission to receive the motive power from the engine and the continuously shifted motive power and to output a compound motive power, a planetary clutch to switch a shift level of the planetary transmission a forward-reverse direction switch to receive the compound motive power and to output either a forward motive power or a reverse motive power, rotation detectors, and a powertrain controller.

公开(公告)号：US20240166211A1

公开(公告)日：2024-05-23

申请号：US18511522

申请日：2023-11-16

Applicant: KUBOTA CORPORATION

Inventor： Tetsuo YAMAGUCHI ,  Ryoma IWASE ,  Tomonari TSUCHIDA

IPC: B60W30/182 ,  B60W30/14 ,  B60W40/12 ,  F16H47/04

CPC classification number: B60W30/182 ,  B60W30/143 ,  B60W40/12 ,  F16H47/04 ,  B60W2510/0283 ,  B60W2510/0638 ,  B60W2510/1015 ,  B60W2720/10

Abstract: A work vehicle includes a controller configured or programmed to include an input revolutions number calculator to calculate an input revolutions number, and a vehicle speed controller switchable between a first vehicle-speed control mode and a second vehicle-speed control mode. In the first vehicle-speed control mode, the vehicle speed controller is configured or programmed to control a vehicle speed of the work vehicle based on a value detected by an input rotation sensor. In the second vehicle-speed control mode, the vehicle speed controller is configured or programmed to control the vehicle speed based on a value calculated by the input revolutions number calculator.

公开(公告)号：US20240167566A1

公开(公告)日：2024-05-23

申请号：US18511508

申请日：2023-11-16

Applicant: KUBOTA CORPORATION

Inventor： Tetsuo YAMAGUCHI ,  Ryoma IWASE

IPC: F16H61/70 ,  B60K17/02 ,  B60K17/10 ,  B60K17/356 ,  F16H47/04 ,  F16H59/44

CPC classification number: F16H61/702 ,  B60K17/02 ,  B60K17/10 ,  B60K17/356 ,  F16H47/04 ,  F16H59/44 ,  B62D49/06 ,  F16H2200/2035

Abstract: A work vehicle includes a restrainer vehicle speed setter to set a restrainer vehicle speed, and a switch restrainer to permit switching of the forward/backward travel switching device while a detected vehicle speed is lower than the restrainer vehicle speed and prevent switching of the forward/backward travel switching device while the detected vehicle speed is a high speed not lower than the restrainer vehicle speed.

公开(公告)号：US20240167562A1

公开(公告)日：2024-05-23

申请号：US18379335

申请日：2023-10-12

Applicant: KUBOTA CORPORATION

Inventor： Tetsuo YAMAGUCHI ,  Ryoma IWASE

IPC: F16H61/02 ,  F16H47/04 ,  F16H59/70

CPC classification number: F16H61/0206 ,  F16H47/04 ,  F16H59/70 ,  F16H59/40

Abstract: An electromagnetic valve control device includes a current gear ratio obtainer to obtain a current gear ratio as a ratio of an output revolutions number of a driver and an output revolutions number of a transmission, a current electric current value obtainer to obtain a current electric current value as a value of an electric current to be inputted to a first electromagnetic valve or a second electromagnetic valve, and a switching controller to, based on the current electric current value and a gear ratio difference as a difference between a target gear ratio and the current gear ratio, perform electromagnetic valve switching control to switch between use of the first electromagnetic valve to control a pump swash plate and use of the second electromagnetic valve to control the pump swash plate.

公开(公告)号：US20240167550A1

公开(公告)日：2024-05-23

申请号：US18503409

申请日：2023-11-07

Applicant: KUBOTA CORPORATION

Inventor： Tetsuo YAMAGUCHI ,  Ryoma IWASE

IPC: F16H47/04 ,  F16H59/40 ,  F16H59/70 ,  F16H59/72 ,  F16H61/16 ,  F16H61/70

CPC classification number: F16H47/04 ,  F16H59/40 ,  F16H59/70 ,  F16H59/72 ,  F16H61/16 ,  F16H61/702 ,  F16H2059/683

Abstract: A continuously variable powertrain device for a work vehicle includes a hydraulic static transmission to output a continuously shifted motive power while continuously varying a velocity of a motive power received from an engine, a planetary transmission to receive the motive power from the engine and the continuously shifted motive power and to output a compound motive power, a pressure detector to detect a hydraulic pressure in a closed circuit of the hydraulic static transmission, a planetary clutch mechanism to switch a shift level of the planetary transmission, and a powertrain controller to control actuation of the hydraulic static transmission and the planetary transmission based on a shift command.