Patent attributes
A load control structure for a work vehicle comprises: set rotation speed detection device for detecting a set rotation of an engine of the work vehicle; actual rotation speed detection device that senses an actual rotational speed of the engine; continuously variable speed change device that receives power from an engine of the work vehicle; speed change position detecting device for detecting a speed change operation position of the continuously variable speed change device; operating device for speed-shifting the continuously variable speed change device; control device for controlling the operation of the operating device; wherein the control device calculates a drop amount of the actual engine rotation speed from the set rotation speed based on the detected information from the set rotation speed detection device and the actual rotation speed detection device, and sets a limit operation position for the continuously variable speed change device based on the calculated drop amount and a correlation data that correlates the actual engine rotation speeds with operating positions of the continuously variable speed change device, and controls the operating device such that the operating position of the continuously variable speed change device moves to the limit operating position based on the set limit operating position and detected information from the speed change position detecting device, and wherein the control device has command device for commanding a change of the correlation data.
