Theoretical research into the frictional slipping of wheel-type undercarriage taking into account the limitation of their impact on the soil

摘要

The frictional slipping of the tractor’s wheels causes great damage to the soil fertility. To ensure the minimal disturbance of its structure, it has been proposed to determine the maximum slippage of driving wheels taking into account the value of their permissible pressure on the soil in the horizontal plane. As a result, it has been established that for the substantial reduction of the soil structural damage during the spring agricultural field operations the maximum permissible frictional sliding δmax of the wheel-type undercarriage of tractors classified into drawbar pull categories 5, 3 and 1.4 (drawbar pull based classification approach is used in Ukraine and some other countries) has to be equal to 15%, 12% and 9% respectively. In the summer/autumn period, the values δmax can be greater and, accordingly, be equal to 20%, 16% and 13%. Wheeled tractors in drawbar pull category 5 equipped with single standard tyres can be used for field operations only in the summer/autumn period. For their operation in spring they must certainly be equipped with twin tyres. The implementation of this design solution is appropriate for all wheeled tractors.