Improving pneumatic tires for wheeled tractors

Abstract

The article is devoted to the development of an effective technique for determining the optimal combination of parameters of the internal structure of tractor pneumatic tires. One of the factors affecting the performance indicators of machine-tractor units is the perfection of the propulsors, among which the wheels are dominant. Optimization of the parameters of pneumatic tire as one of the links of oscillatory system and the main element of wheel propulsion is one of the directions of increasing the efficiency of operation of machine and tractor units. The research was carried out with the aim of developing an effective technique for determining the elastically damping, deformation, and 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 the size 16.9-30 of radial and diagonal-parallel structures were studied. Tire tester allows to perform determination of the required indicators in real operating conditions. The developed research methodology allows to determine the necessary characteristics of pneumatic tires, perform comparisons of various options. 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 16.9-30DP reduces the sealing effect of the unit on the soil. It has been established that the application of the experimental tires 16.9-30DP reduces the compaction of the unit on the soil. The increase in tractive resistance along the wheel is 47,5 % and 27,9 %, respectively, with production and experimental tires The optimal parameters of diagonal-parallel tire were determined: the ply lamination is 6, the cord inclination to the meridian in the widest place is 33,4о, the internal air pressure is 0,0995 MPa.