The efficiency of the wheel doubling in the tractor of traction class 5

The purpose of the study: comparative assessment of traction and agrotechnological indicators of undercarriage systems in the wheeled tractors of class 5 with double and single tires and with different structures and dimensions. The research me thod, which allows to obtain all indicators for assessing the contact of tires with the supporting base in accordance with the standards recommended for this type of research work, as well as industry and developed methods, is experimental involvinga specially developed tire tester. The defining quality of tires are the high traction and coupling indicators with minimal impact on the soil, providing such a density of addition after the passage of the mobile aggregate that would correspond to the optimal conditions for the development of various crops. It has been found that: tires of different dimensions and internal structure have a different level of impact on the soil base, but with the single complete set of wheels with them, the undercarriage systems of the mobile energy devices do not meet the requirements of GOST 26955-86;with a larger contact area with a supporting base, the 33R-32 tire has the maximum pressure value higher than the 30.5R-32 tire has, due to the high pressure unevenness in its width; reduction of the negative impact on the soil base of the propulsion unit devices of traction class 5 is possible when they are equipped with double wheels; the results of traction tests of the K-701M tractor with double wheels on the fallow show the increase in the nominal traction effort from 55,0 to 66,0 kN, the slipping of the propulsion units decreases, the values of the maximum power on the hook and traction efficiency increase by almost 8,7% while reducing fuel consumption by 4,3%.