Abstract
An important part of power losses in tractor transmissions is due to the oil they contain. To limit power losses, a reduction in oil level in the tractor drive train is necessary, while still ensuring lubrication of the individual components. In this article, oil flows sufficient for the lubrication of gears and bearings in a full power-shift transmission front box were calculated. After evaluation of individual element power loss in the worst working condition, a thermal balance and the oil flow required to eliminate the produced heat were calculated. Gear lubrication requires about 10 L min-1, while rolling bearings need about 2 L min-1. Two gear jet flow lubrication systems were then evaluated and the most important parameters established for correct nozzle positioning.
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