PROBLEM TO BE SOLVED: To improve operability for straight-running and turning in a running vehicle comprising: a straight-running gear shift device for transmitting power to a right and a left running units supporting a running machine body and a turning gear shift device for transmitting power reversely.SOLUTION: In a steering box 20 with a built-in turning input shaft 72 to be turned by a turning operation tool, a gear shift controller 81 to be turned by the turning input shaft 72 is enabled to turn freely on a gear shift axis X perpendicular to the turning input shaft, and a turning controller 82 to be turned by the turning input shaft 72 is enabled to turn freely on a turning axis Y perpendicular to both the axis of the turning input haft and the gear shift axis X. Both they are associated with the turning operation tool as turn with inclination on the individual axes through a main gear shift lever input shaft 85 associated with the gear shift operation tool, and the speed of the straight-running gear shift device is changed by the inclined turn of the gear shift controller through a gear shift output shaft 86, and the speed of the turning gear shift device is changed by the turn of the turning controller by the turning input shaft through a turning output shaft 104.COPYRIGHT: (C)2009,JPO&INPIT【課題】走行機体を支持する左右の走行部に動力伝達する直進走行用変速装置と,動力を逆回転伝達する旋回走行用変速装置とを備えた走行車両において,直進及び旋回走行の操作性を小型の機構にて向上する。【解決手段】前記旋回用操作具にて回転する旋回入力軸72を内蔵するステアリングボックス20内に,前記旋回入力軸にて回転する変速制御体81と旋回制御体82とを,変速制御体が前記旋回入力軸に直交する変速軸線Xの回りに回転自在し,旋回制御体が前記旋回入力軸の軸線及び前記変速軸線Xに直交する旋回軸線Yの回りに回転自在に設け,これらの両方を,前記変速用操作具に連動する主変速レバー入力軸85を介してその軸線回りに傾き回転し,前記変速制御体の傾き回転にて変速出力軸86を介して直進走行用変速装置を変速作動し,前記旋回制御体の前記旋回入力軸による回転にて旋回出力軸104を介して旋回走行用変速装置を変速作動する。【選択図】図5
