Análise de desempenho em tração de rodado simples e duplo em um trator agrícola

Abstract

A major problem of agricultural tractor during several operations in which it is used is the difficulty of working in various moisture conditions and soil types affect your ability to traction force, slip and fuel consumption. What has been observed is that with increased contact surface between the tire of the tractor and the ground, there is the possibility of reductions in slippage, since it compensates with its increased weight on the wheels. Considering the importance of agricultural tractors and characteristics of pneumatic tires to develop traction force and the fluctuation in the soil, this study aimed at comparing the use of single and dual tires on the rear axle of a tractor equipped with front wheel assist (FWA ) with different tire inflation pressures internal to the tractor and shot at a fixed pressure of the external configuration of dual tires, to assess performance in traction, using as parameters to assess the strength available: the drawbar pull, fuel consumption, the slip. Were also assessed indirectly by the pressure applied by the treads to the ground, weight transfer, forward kinematics, drawbar power, traction efficiency, dynamic coefficient of traction. It was found that the use of dual tires increases the contact surface of the tire with the soil may reach 13% increase from the surface, there are increments of 4.35% in the traction force on the use of dual tires in relation to the single increases in 7.5% of the available power at the drawbar when used double wheels at a pressure of 138 kPa. There was no difference in the slip to both axles. It was also found that the use of dual tires led to the highest efficiency in the drawbar that for the single, with the highest efficiency of 72.8%. The treatment produced the best results in this analysis was to run the setup dual tires with the pressure of 138 kPa.