PROBLEM TO BE SOLVED: To promptly judge the largeness of dashing quantity by measuring dashing phenomena and the largeness thereof by the rotational strain of a PTO shaft.SOLUTION: The tractor equipped with a rotary tiller 25 linked to the rear part of a machine body so as to be freely lifted and lowered, and a plurality of tilling tines 29 installed in a tilling shaft 33 interlocked with the rotary tiller 25 so as to rotate normally by receiving a driving force of the PTO shaft 62 at the machine body side in the rotary tiller 25 is further equipped with a torque-measuring means 71 for measuring the rotary torque of the PTO shaft 62, and a controlling part 42 for outputting the braking force to a brake mechanisms 60 and 60 of the machine body based on the change of the rotary torque when lowering the rotary tiller 25 from a non-operation state to an operation state.COPYRIGHT: (C)2010,JPO&INPIT【課題】ダッシング現象およびその大きさをPTO軸の回転ひずみによって測定することによりダッシング量の大きさをいち早く判定しようとする。【解決手段】機体後部にロータリ耕耘装置25を昇降自在に連結し、該ロータリ耕耘装置25には機体側PTO軸62の駆動力を受けて正転連動する耕耘軸33に複数の耕耘爪29を設けたトラクタにおいて、前記PTO軸62の回転トルクを測定するトルク測定手段71を設け、ロータリ耕耘装置25が非作業状態から作業状態へ降下する際の回転トルクの変動に基づいて機体のブレーキ機構60,60に制動出力する制御部42を設ける。【選択図】 図5
