PURPOSE: To prevent a field from being roughened during the turning of a machine body by disconnecting the transmission to a rear wheel on the inner travel side with clutches during the turning and making the rear wheel on the inner travel side freely change the direction and rotate relatively to the machine body with rear wheel support devices.
CONSTITUTION: Front wheels (5L) and (5R) and rear wheels (6L) and (6R) are made steerable and the center of change in direction and rotation of the rear wheels is located on the center of the wheels when viewed in a plane. At the time of turning, the transmission to the rear wheel on the inner travel side is disconnected with clutches (3OL) and (30R) and the rear wheel on the inner travel side is made to freely change the direction and rotate relatively to the machine body with rear wheel support devices (38L) and (38R).
TAMAI TOSHIO
SHIOZAKI TAKAHIDE
SEIKE MICHINORI
KAMIYA HISASHI
SUZUKI TAKASHI
SETOGAWA TETSUO
SUZUKI HIROSHI
