Patent ID: 7273441
Filing Date: 2007-09-25
Classification: F16H,Y10T

Abstract:
1. A work vehicle having a speed change arrangement comprising: ground contact means; an engine supported by the ground contact means; power train provided between the engine and the ground contact means, the power train transmitting power to the ground contact means; a speed change device provided to the power train; an accelerator operating member for controlling the accelerator for the engine; rotational speed sensing means that senses an actual rotational speed of the engine; automatic speed change means for shifting the speed change device to a higher speed position if a difference between a set rotational speed of the engine set by the accelerator operating member and the actual engine rotational speed is less than a first set value, and for shifting the speed change device to a lower speed position if the difference between the set rotational speed of the engine set by the accelerator operating member and the actual engine rotational speed is greater than a second set value which is greater than the first set value; adjusting means for changing the first and second set values.