Scientific paper ID 49 : 2005/1

One of the most important purposes of the mechanical practice is to predict the fatigue life and the operating resource of the real details. This task is difficult and it demands labor-intensive and power consuming mode tests. That is why, the engineers continuously search for analytical methods for prediction the fatigue life of metals and details. In this paper is presented an analytical method for evaluation of a minimal resource of the spur gears of the traction reducer of the main engine. It is an attempt for conservative valuation of the spectrum of the loading on the spur gears by means of the surface hardness.