PROBLEM TO BE SOLVED: To provide a driving control device for a work vehicle capable of preventing application of a large load on an engine while avoiding insufficiency of driving force (torque) for running, and capable of carrying out that accurately.SOLUTION: The driving control device is provided with a retaining means 56 for retaining movement to a low speed side of an operation part 7Ma for capacity change in a variable capacity type hydraulic motor 7M of a hydrostatic continuously variable transmission 7 for running by operation force of operating movement to a high speed side, an operation force adjusting means 58 for changing and adjusting the operation force of the retaining means 56, and a control means 79 for changing and adjusting a command value of commanding the operation force adjusting means so as to maintain the operation part 7Ma in a set target position. The control means 79 changes and adjusts the command value commanding the operation force adjusting means 58 in a state of not increasing the command value such that the operation part 7Ma exceeds a set upper limit, and if it is distinguished that it is in a standard driving condition, the set upper limit is corrected on the basis of a command value of when maintaining the operation part 7Ma in the set target position.COPYRIGHT: (C)2010,JPO&INPIT【課題】走行用の駆動力(トルク)の不足を避けながら、エンジンに大きな負荷が掛からないようにすることができ、しかも、そのことを的確に行うことができる作業車の走行制御装置を提供する。【解決手段】走行用の静油圧式無段変速装置7の可変容量型の油圧モータ7Mにおける容量変更用の操作部7Maが低速側に移動するのを高速側に移動操作する操作力にて保持する保持手段56と、保持手段56の操作力を変更調整する操作力調整手段58と、操作部7Maを設定目標位置に維持させるように操作力調整手段に指令する指令値を変更調整する制御手段79とが設けられ、制御手段79が、操作部7Maを設定上限値を超えて指令値を増加させない形態で、操作力調整手段58に指令する指令値を変更調整し、且つ、基準走行状態であることを判別すると、操作部7Maを設定目標位置に維持させるときの指令値に基づいて設定上限値を補正する。【選択図】図4
