BALLASTING AND DUAL TIRES USING OF WHEELED AGRICULTURAL TRACTORS UNDER THE CONDITIONS OF FULFILLING AGRO-ECOLOGICAL STANDARDS FOR SOIL INTERACTION

Abstract

The article presents an analytical approach to the implementation of ballasting and dual tires using of agricultural wheeled tractors, which is based on the unconditional fulfilment of agro-ecological standards of tires soil interaction. The necessity of harmonizing the indicators of the position of the centre of gravity of the tractor, the footprint area of the front and rear tires ratio, as well as their load capacity is shown. The need to use equal flotation in tractor’s tires during single and double use has been proven, which determines the need to maintain the position of the centre of gravity during ballasting. The method of selecting the mass of ballast weights for installation in the rear wheel discs and the front linkage system of the tractor, as well as the ballast weight system, which makes it possible to ensure the maximum possible weight of the tractor to meet the agro-ecological requirements regarding the maximum pressure on the soil, is proposed. The perspective of dual tires using to reduce the maximum pressure of the tractor on the soil is shown, and the high efficiency of ballasting the tractor on dual tires is also proven. The example shows the possibility of increasing the part of the territory of Ukraine where it is possible to operate the tractor without violating agro-ecological norms by 20-40% due to the use of dual tires. The possibility of increasing the efficiency of the tractor up to 1.5 times due to ballasting and doubling of tires has also been proven. The obtained data are based on 20 calculation variants of the tractor with different degrees of ballasting and the use of different tire doubling schemes.