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http://dx.doi.org/10.5307/JBE.2009.34.2.071

Analysis of Drawbar Load Acting on Tractor Engine at Maximum Drawbar Power  

Kim, S.C. (KSAM, Dept. of Biosysems and Biomaterials Science and Engineering, and Institute for Agricultural and Life Sciences, Seoul National University)
Kim, K.U. (KSAM, Dept. of Biosysems and Biomaterials Science and Engineering, and Institute for Agricultural and Life Sciences, Seoul National University)
Kim, D.C. (Technical Center Tongyang Moolsan Co.)
Publication Information
Journal of Biosystems Engineering / v.34, no.2, 2009 , pp. 71-76 More about this Journal
Abstract
This study was conducted to investigate the load acting on a tractor engine when it delivers the maximum power at drawbar. The results of the drawbar tests on the 5 locally-made and 14 imported tractors conducted at NIAE in 2004, and the 15 tractors tested at OECD test stations in foreign countries were analyzed and presented by the torque load ratio, defined as a ratio of the engine torque load caused by drawbar pull to its full-load capacity, as a function of pull speed. The NIAE test results showed that the torque load ratio increased from 20 to 80% with pull speed less than 5 km/h. At speeds faster than 5 km/h, it was 80${\sim}$110% regardless of the pull speed. However, the OECD test results showed that the torque load ratio was evaluated mostly to be 70${\sim}$90% in the entire pull speed range. The same trend was also shown for the maximum drawbar load. The difference in the torque load ratio may be attributable to bias-ply tires for locally-made and some imported tractors. It is also suggested that the input torque load may be increased safely up to 120% of the full load capacity of the tractor engine for an accelerated life test of tractor transmissions.
Keywords
Drawbar-load of tractor; Full-load performance;
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