| 摘要 |
<p>Disclosed is a hydraulic four-wheel-drive work vehicle such that at least either a first hydraulic motor unit or a second hydraulic motor unit, which drives first wheels at one of the longitudinal locations or second wheels at the other longitudinal location, respectively, is of the variable displacement type, and that a pertinent displacement adjustment mechanism is actuated by manual operation or by an electric motor on the basis of the turning radius difference between the first wheels and the second wheels. In this hydraulic four-wheel-drive work vehicle, a control device which performs actuation control of the electric motor comprises a normal mode wherein the electric motor is actuated according to manual operation or according to the turning radius difference, and a raised torque mode wherein the displacement volume of the variable displacement hydraulic motor is fixed to a first displacement value which is higher than a reference displacement value. In a case where a drive source is in operation, and where the vehicle is in an idling state such that a pump displacement adjustment mechanism is in a neutral state, the raised torque mode is started. When the vehicle speed reaches a first speed, the normal mode is started.</p> |
