Desempenho operacional de um trator agrícola em função da lastragem, pressão de insuflagem e da vida útil do pneu

Abstract

Mounted on a wheeled chassis, the agricultural tractor is a self-propelled vehicle which wheels main functions is to offer support tractors, support, guidance and self-locomotion, in addition to being responsible for generating tractive effort. Among the different characteristics of the tires that affect the operational performance of the tractor are the inflation pressure, normal load on the drive wheels and the conditions of wear claws. This study aimed to evaluate the operational performance of operating an agricultural tractor with new tires and worn in conditions of weights and three inflation pressures of tires. The experiment was conducted at the experimental unit of the Department of Animal Science, Federal University of Lavras, with soil moisture an average of 25.69% and 14.97 t ha-1 dry matter at the time of testing. We used a tractor 4x2 TDA, with an output of 65.62 kW (88 HP) engine. The tires were of the type R1, with the following features: diagonal (front: 12,4-24 rear: 18,4-30), and the average height of the clutches of the new tire was 30 and 35 mm for front and rear tires respectively, while the old tires claws 18 and measured 4.5 mm, respectively. The experimental design was randomized blocks arranged in a 2x3x3 factorial arrangement, with 18 treatments and 3 replications. The results for the different parameters, strength and power in the drawbar, coefficient of traction and fuel consumption showed advantages for the tractor equipped with new tires. The slip was greater when used new tires due to increased strength and power in the drawbar. When using new or worn tires, different levels of weights and inflation pressure are more favorable to the development of greater strength and power at the drawbar, and lower fuel consumption.