Study on sliding friction torque and interfacial thermal behaviour of friction torque limiter

To study the effect of torque and temperature on the performance of a sliding friction pair of a friction torque limiter (FTL), the calculation model of FTL sliding friction torque and a transient thermal model were established, the temperature evolution law and influencing factors on the FTL sliding friction interface were analysed, and the thermal fatigue life of the friction disc under extreme working conditions was determined. The results show that the thermal ring generated by sliding friction leads to a non-uniform radial temperature distribution of friction pairs. As sliding friction proceeds, the hot ring moves from the middle radial inner diameter, and the temperature rise increasers with the increase of the friction coefficient, spring force, and sliding speed of the friction pair. In contrast, the temperature rise decreases with an increase in the friction coefficient of the spline pair. The fatigue life of the friction disc under extreme sliding friction conditions is 961 stress cycles.