PROBLEM TO BE SOLVED: To provide a working machine that alleviates disturbance of a field by a rear wheel inside vehicle turning, reduces shake and vibration of connected working apparatus etc., and improves operability.SOLUTION: The working machine includes a traveling vehicle body 2 furnished with a motor 20, front wheels 10 and rear wheels 11, a drivers seat 31, a steering wheel 34, a steering mechanism (86I etc.) to change the direction of the front wheels 10 in conjunction with the operation of the steering wheel 34, a seedling plant part 4 attached to the rear side of the traveling vehicle body 2 by a lifting and lowering link apparatus 3, a means 102 for detecting the number of revolutions of the motor, and a controller 163 furnished with a control function B for intermittently engaging and disengaging drive force of the rear wheel 11 inside vehicle turning in conjunction with the steering mechanism (86I etc.). The controller 163 has a correction function C that reduces the ratio of engaging time of engaging and disengaging period of a side clutch of the rear wheel 11 inside vehicle turning of the control function B when the number of revolutions detected by the means 102 for detecting the number of revolutions of the motor is a prescribed value or above.COPYRIGHT: (C)2011,JPO&INPIT【課題】旋回内側の後輪による圃場の荒らしが軽減できると共に、連結されている作業装置などの揺れや振動を低減し、操作性を向上させる作業機の提供である。【解決手段】原動機20を備えた走行車体2と、前輪10及び後輪11と、操縦席31と、操向ハンドル34と、操向ハンドル34の操作に連動して前輪10の向きを変更できるステアリング機構(86Iなど)と、走行車体2の後側に昇降リンク装置3により装着された苗植付部4と、原動機の回転数検出手段102と、ステアリング機構(86Iなど)に連動して旋回内側の後輪11の駆動力を断続的に入切する制御機能Bを備えた制御装置163とを備えた作業機であって、制御装置163は、原動機回転数検出手段102により検出される回転数が所定値以上である場合に制御機能Bの旋回内側の後輪11のサイドクラッチの入切周期の入り時間の割合を減少させる補正機能Cを有する。【選択図】図15
