Tractive Performances of Wheel-Type Tractor (I)

Drawbar Test

Abstract

In the drawbar tests of a wheel-type farm tractor, the drawbar pull and the torques of clutch shaft, rear and front axle were measured. This tractor could be driven not only by the rear wheels but also the four wheels.
The drawbar pull by the four wheels driving were larger than that by the rear-wheel-driving on field, but there was no difference between both driving on concrete road.
The torques of rear wheel axles were negative on concrete road, because the speeds of front wheel were larger than the rear wheel, but those were positive on field, because the running resistance increased.
The fluctuations of these torques, especially the clutch shaft, were large when the tractor was running in high speed on concrete road.