Patent ID: 7686737

Claim:
A load control structure for a work vehicle comprising: set rotation speed detection means for detecting a set rotation of an engine of the work vehicle; actual rotation speed detection means that senses an actual rotational speed of the engine; continuously variable speed change device that receives power from the engine of the work vehicle; speed change position detecting means for detecting a speed change operation position of the continuously variable speed change device; operating means for speed-shifting the continuously variable speed change device; control means for controlling the operation of the operating means; operation speed setting means for setting an operation speed at which the continuously variable speed change device is operated; wherein the control means 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 means and the actual rotation speed detection means, 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 means 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 means, and wherein the control means controls the operation of the operating means such that the continuously variable speed change device is operated by the operating means at the operation speed set by the operation speed setting means.