Work vehicle
A work vehicle includes a body 1 ; a plurality of travel wheels 2 at front and back portions of the body 1 on each of left and right sides; a plurality of holder mechanisms A held by the body 1 and holding the respective travel wheels 2 in such a manner as to be capable of moving the travel wheels 2 independently of one another relative to the body 1 ; and a plurality of crawler travel devices E attachable to and detachable from the respective holder mechanisms A.
1 . A work vehicle, comprising:
a body;
a plurality of travel wheels at front and back portions of the body on each of left and right sides;
a plurality of holder mechanisms held by the body and holding the respective travel wheels in such a manner as to be capable of moving the travel wheels independently of one another relative to the body;
a plurality of auxiliary wheels disposed at front and back portions of the body on each of the left and right sides and held by the respective holder mechanisms; and
a plurality of crawler travel devices attachable to and detachable from the respective holder mechanisms, each of the crawler travel devices comprising a driving sprocket, a driven sprocket, and a belt wound around the driving sprocket and the driven sprocket,
wherein with each crawler travel device attached to a corresponding one of the holder mechanisms, the driven sprocket is coaxial with a corresponding one of the auxiliary wheels.
2 . The work vehicle according to claim 1 , wherein:
the holder mechanisms each comprise a hydraulic motor configured to drive a corresponding one of the travel wheels, and
the crawler travel devices are each drivable by a corresponding one of the hydraulic motors while the crawler travel device is attached to a corresponding one of the holder mechanisms.
3 . The work vehicle according to claim 2 , wherein:
with each crawler travel device attached to a corresponding one of the holder mechanisms, the driving sprocket is coaxial with a corresponding one of the travel wheels and drivable by a corresponding one of the hydraulic motors.
4 . The work vehicle according to claim 1 , wherein:
the driving sprocket has an axis apart from an outer surface of the belt by a first distance, whereas a corresponding one of the travel wheels has an axis apart from an outer surface of the corresponding travel wheel by a second distance, the first distance is equal to or smaller than the second distance.
5 . The work vehicle according to claim 1 , wherein:
the holder mechanisms each comprise:
a bendable link mechanism; and
an orientation changer configured to change an orientation of the bendable link mechanism independently, and
the bendable link mechanism has a leading end provided with a corresponding one of the travel wheels.
6 . The work vehicle according to claim 5 , wherein:
the orientation changer is a hydraulic cylinder.
7 . The work vehicle according to claim 1 , wherein:
the body comprises:
a back body section; and
a front body section swingable in a left-right direction of the body relative to the back body section,
the front body section holds each holder mechanism holding a front one of the travel wheels, and
the back body section holds each holder mechanism holding a rear one of the travel wheels.