Abstract
Objetivou-se com o presente trabalho avaliar o desempenho operacional de um trator agrícola operando com pneus novos e desgastados em três condições de lastragem e três pressões de inflação dos pneus. O experimento foi realizado na unidade experimental pertencente ao Departamento de Zootecnia da Universidade Federal de Lavras, apresentando teor de água do solo de 25,6% e 14,97 T ha-1 de matéria seca no momento da realização dos testes. Utilizou-se um trator 4x2 TDA, com potência de 65,62 kW (88 HP) no motor. Os pneus foram do tipo R1, com as seguintes características: diagonal (dianteiros: 12.4-24; traseiros: 18.4-30), sendo que, a altura média das garras dos pneus novos foi de 30 e 35 mm para os pneus dianteiros e traseiros respectivamente, enquanto os pneus desgastados as garras mediram 18 mm e 4,5 mm, respectivamente. O delineamento experimental foi de blocos casualizados, em esquema fatorial 2x3x3, com 18 tratamentos e 3 repetições. Os resultados evidenciaram vantagens para o trator quando equipado com pneus novos. A patinagem foi maior quando usado pneus novos devido ao aumento da força e potência na barra de tração.
Highlights
The incorrect inflation pressure is the factor that most contributes to the development of premature damage and wear
The results showed that the reduction on total ballast from 51.28 kN to 43.01 kN caused a reduction of 14.5% in spinning and 15% in the traction coefficient
The experiment was conducted in 54 randomized plots in a 2x3x3 factorial design, totaling 18 treatments and 3 repetitions
Summary
The incorrect inflation pressure is the factor that most contributes to the development of premature damage and wear. Overloading and inflation pressure below the specification results in greater bending on the sides, causing the tread area to present premature and uneven wear. For pressures above specification causes deficient bending of the tread area, resulting in an increase of wear on the central part of the tire. According to Yanai et al (1999), tire characteristics that affect operational performance of the tractor are construction type, tread area configuration, wheel width and the diameter and normal load on drive wheels. Among the soil properties that affect the efficiency and operating performance of an agricultural tractor, those most important are soil texture, moisture and surface conditions, depending on each type of existing ground cover (GABRIEL FILHO et al, 2004; SALVADOR et al, 2009)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
