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vol.34 número8Determinação da tensão de água em solo agrícola usando um sensor de dissipação de calorAvaliação de duas variedades de cana-de-açúcar submetidas a diferentes tempos de armazenamento índice de autoresíndice de assuntospesquisa de artigos
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Pesquisa Agropecuária Brasileira

versão impressa ISSN 0100-204Xversão On-line ISSN 1678-3921

Resumo

YANAI, Kiyoshi et al. Operational performance of a tractor with and without the use of wheel assist drive. Pesq. agropec. bras. [online]. 1999, vol.34, n.8, pp.1427-1434. ISSN 1678-3921.  http://dx.doi.org/10.1590/S0100-204X1999000800015.

The factors that may have influence on tractor performance are several, inclusive tire load and inflation pressure. These factors were studied in field conditions (surface not disturbed), under four tire load, four inflation pressure with and without the use of the mechanical front wheel assist drive. A randomized complete block design with three replications was used. The tractor under evalution was submitted to a constant drawbar pull by other tractor linked with a load cell. The results showed the significant influence of load tire on the rear wheel slip and on coefficient of traction, which increased with the decreasing of the load tires. The inflation pressure influenced significantly the slip, the forward velocity and drawbar power without to show a general tendency in the behaviour. The use of mechanical front wheel assist drive showed significant advantages to the some prior parameters. The interactive effects of load tire and inflation pressure indicated that some combinations were more favourable to develop major velocity and minor slip. The characteristics concerning to engine performance (fuel consumption and speed engine) were not influenced by neither factors and/or their interactive.

Palavras-chave : ballast; agricultural tractor; drawbar.

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