Optimization of design parameters of radial tires of propellers of combine harvesters
The article is devoted to the solution of an important scientific and practical problem - optimization of the tire shell design parameters of the leading wheels of combine harvesters of high productivity, operating in conditions with low bearing capacity. Optimization of the parameters of the pneumatic tire, as a link in the oscillatory system and the main element of the wheel propulsion, is one of the directions for improving the functioning of combine harvesters. One of the factors affecting the performance indicators of combine harvesters is the perfection of wheeled propellers. Their agrotechnical properties can be improved due to a rational choice of tire parameters depending on the type of rolling surface, which will also help to reduce fuel consumption. On the basis of the abovementioned, the aim of this paper is to investigate the effect on the performance of combine harvesters of the characteristics of the tires used on the driving wheels and to improve their agrotechnical properties by optimizing the parameters of the pneumatic tires. The description, methods and results of experimental studies using specially designed and providing reliable results of devices for determining deformations of the inner and outer shells of the tire relative to the rim in the circumferential and radial directions, as well as contact pressures and stresses in the soil are described. On the basis of theoretical and experimental studies of the work of combine harvesters of high productivity, the influence of the parameters of the pneumatic tires of the driving wheels on the performance of them has been established. The optimum combination of design parameters of the experimental pneumatic tire of a radial design for grain harvesters is determined. The results of the research will make it possible to develop recommendations for the selection of optimal parameters for pneumatic tires that contribute to improving the performance of grain harvesters used under various operating conditions by bundling their driving wheels with radial-type tires.