Exper-imental study of the characteristics of tractor pneumatic tires

Abstract

One of the factors affecting the performance indicators of machine-tractor units is the perfection of the movers, among which the wheeled ones are dominant. Optimization of the parameters of the pneumatic tire as one of the elements of the oscillatory system and the main element of wheeled mover is one of the directions of increasing the efficiency of operation of machine-tractor units. The investigations were carried out with the aim of developing an effective technique for the experimental determination of the elastically damping, deformation, traction characteristics of tractor pneumatic tires, which makes it possible to correctly compare their various variants. In the course of experimental studies, the characteristics of pneumatic tires of size 16.9-30 radial (serial) model F-39 and diagonally parallel (experimental) structures were studied. Facility for testing pneumatic tires (tire tester) allows to perform the determination of the required indicators in real operating conditions. The developed technique of experimental researches allows to define necessary characteristics of pneumatic tires, to carry out comparisons of various variants. The deformation characteristics of pneumatic tires in the general case of their loading show that they experience longitudinal, torsional and radial deformations. The presence in 16.9R30 serial tire in contrast to the 16.9-30DP experimental tire of radial deformation directed from the wheel axis in the zone in front of the contact surface under the driving rolling mode causes large hysteresis losses in it. The experimental traction characteristics of pneumatic tires show a higher efficiency of the diagonal-parallel 16.9-30DP tire and its less slipping, which predetermines less abrasion of the soil with this type of tire. It has been established that the application of the experimental tires