| 摘要 |
PROBLEM TO BE SOLVED: To provide a pulled type beat harvester adapted for a harvest in the bad situations of a farm field condition.SOLUTION: A system 31 is so constituted by adopting a clawler unit driven by hydraulic motors 21L and 21R in place of the conventional wheels that the outputs (the resolution speed) of hydraulic motors 21L and 21R are controlled on the basis of the traction to act on a hitch 23 on the basis of the outputs (or the revolution speeds) of the hydraulic motors 21L and 21R. As a result, a pulled type beat harvester to be pulled by a tractor can be adapted for a harvester in the situations of a bad farm field condition. |
