Contact Fatigue and Strength Evaluation of Traction Drive Rollers.

Abstract

As the traction drive works under the high traction oil, in small slip ratio, and sometime accompanied with skew, the surface fatigue failures of the traction drive rollers are different to that of gears and bearings. In this research, fatigue tests of traction rollers are performed under the conditions of different load, slip ratio and skew angle. The effects of running condition on the fatigue lives of traction rollers are clarified considering the surface crack growth and wear. A higher slip ratio will make a lower fatigue life, but skew will lead to a higher fatigue strength because of the severe surface wear, which diminishes tile surface crack length, and the mechanics condition, which makes surface crack grow difficultly. For evaluation of the effects of such as slip ratio and skew on the fatigue strength of traction rollers, a new method is put forward in which the relationship between the surface temperature index and fatigue life is used instead of S-N curve.