Теоретичне дослідження умов максимально допустимого буксування рушіїв колісних енергетичних засобів

Abstract

Goal. Determination of the maximum allowable skidding of wheel drives, provided there is no cut and the manifestation of such a level of its displacement by the tire grips, which does not exceed the specified strength limit. Methods. Are based on the use of sections of the theory of traction dynamics of a tractor, which consider the rolling process of an elastic traction wheel on a deformed soil surface. Theoretical calculations of the obtained analytical regularities were carried out in the MathCad 15.0 software environment. The initial data were the parameters of the typical soil environment of the south of Ukraine and the design parameters of tractors of traction classes 1.4 and 3, which are most common in this area. Results. An analytical dependence has been developed that allows you to determine the maximum permissible level of skidding of wheeled power vehicles, taking into account the shear strength limit of the soil medium. According to the calculations, it was established that the maximum allowable value of wheel drive towing significantly depends on the condition of the agrotechnical background on which the tractor moves. A quantitative characteristic of this condition is the coefficient of rolling resistance of the wheel drive. No less significant influence on the value of the maximum permissible skidding of the drivers of wheeled power vehicles is exerted by the angle of the position of the ground grip on the tire in relation to its longitudinal axis of symmetry. Conclusions. Theoretical studies have established that the greater the coefficient of rolling resistance of a wheeled vehicle on this or that agrotechnical background, the smaller the maximum permissible value of its skidding should be, with a more economical impact on the soil environment. Compared to a tractor of traction class 1.4 (MTZ-892), the use of a power tool of traction class 3 (XTZ-17221) is possible with higher values of the maximum permissible towing. The results of mathematical modeling prove that with an increase in the value of the angle of placement (inclination) of the ground grip to the longitudinal axis of symmetry of the wheel drive, the maximum permissible level of its skidding should be lower.