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：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：US20210084884A1

公开(公告)日：2021-03-25

申请号：US16904623

申请日：2020-06-18

Applicant: KUBOTA CORPORATION

Inventor： Shinnosuke ISHIKAWA ,  Komei YAMAWAKI ,  Ryo KURATA

IPC: A01M7/00 ,  A01C23/00

Abstract: A traveling vehicle includes a controller to control a posture of a work machine via a connector. The controller observes whether a farm field surface on which the traveling vehicle travels and the work machine maintain a predetermined positional relationship therebetween, and controls the posture of the work machine when a positional relationship between the farm field surface and the work machine changes from the predetermined positional relationship, so that the positional relationship thus changed is reset to the predetermined positional relationship.