Steering device, steering system, and work vehicle

A steering device for operating a work vehicle, the steering device comprising:

• a support part;
• a base member rotatably supported by the support part;
• a lever rotatably supported by the support part or the base member;
• a biasing member interposed between the lever and the base member, the biasing member being configured to bias the lever to a predetermined position with respect to the base member;
• a transmission mechanism connecting part configured to be connected to a transmission mechanism configured to transmit rotation based on a rotation angle of a coupling shaft of the work vehicle to the base member;
• and
• a restriction part configured to restrict rotation of the lever when an angle of the lever with respect to the base member reaches a predetermined angle, the restriction part including
• a contact part configured to be movable, the lever coming into contact with the contact part when reaching the predetermined angle,
• a position detection part configured to detect a position of the contact part, and
• a drive part configured to drive the contact part.

A work vehicle comprising:

• a first frame;
• a second frame configured to rotate with respect to the first frame;
• a hydraulic cylinder configured to drive the second frame with respect to the first frame;
• a console box disposed on a side of an operator seat of the work vehicle;
• a support part fixed to the console box;
• a base member rotatably supported with respect to the support part;
• a lever supported by the support part or the base member so as to be rotatable with respect to the base member;
• a transmission mechanism including a link, the transmission mechanism being connected to the base member, the transmission mechanism being configured to transmit a rotation state of the second frame with respect to the first frame to the base member, the transmission mechanism being configured to convert the rotation state of the second frame with respect to the first frame to a rotation state of the base member with respect to the support part;
• a controller configured to output an adjustment signal for the hydraulic cylinder based on a rotating operation of the lever with respect to the base member;
• and
• an adjustment part configured to adjust an operation of hydraulic cylinder by the adjustment signal output from the controller.