The Evaluation of Efficiency of Roller Free-Wheel Mechanisms Through Computation and Experiments

Roller free-wheel mechanisms operate in machine drives when high turn-on frequencies and large dynamic loads are involved. The evaluation of efficiency of such mechanisms is usually limited to calculating maximum normal or tangential stresses occurring in contact areas between the rollers and the inner sprocket gear. Other important parameters, such as life of the mechanism, are not normally evaluated. A study of the impact of the external cage fatigue strength on reliability of roller free-wheel mechanisms is performed using the computation-and-experiment approach. The confidence range of runs to failure is adopted as the factor under examination; the fatigue safety factor is considered as an independent factor. It is established that the effect of the fatigue safety factor on the lower limit of runs to failure is characterized by a dependence close to exponential. It is shown that the required efficiency of roller free-wheel mechanisms is guaranteed when the fatigue safety factor of the external cage falls within the 1.5–2.0 range. Further increase of fatigue strength safety leads to an additional increase of material consumption and the weight of the mechanism, without significant increase in safety. The results of the study can be used for forecasting operational life of roller free-wheel mechanisms.

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