离合器摩擦副表面温度对摩擦因数的影响

The Influence of Friction Surface Temperature on Friction Coefficient of Clutch Friction Pair

通过对某型离合器摩擦副的摩擦学小样试验,研究了离合器在结合的滑动摩擦过程中,摩擦面温度对离合器摩擦材料摩擦因数的影响。采用扫描电子显微镜(SEM),分析了样件的摩擦表面形貌,探讨了产生影响的机制,并从摩擦因数角度探讨了微车离合器起步发抖和烧蚀的主要原因。微车离合器摩擦材料摩擦因数随着摩擦面温度先升高,然后趋于稳定,最后再降低,其稳定工作的温度区间为130～220℃;在摩擦面温度较低的工况下,摩擦因数较低,微车起步时,离合器传递的扭矩不足以克服道路阻力,引起微车起步发抖的现象;而在摩擦面温度过高的工况下,离合过程中,摩擦因数较低,传递扭矩效率低,导致离合器滑磨时间过长,引起烧蚀现象。

Through the tribological sample test of a certain type of clutch friction pair,the effects of friction surface temperature on the friction coefficient of the micro - car clutch friction material were studyed. The morphology of wear surface was analyzed with scanning electron microscopy （SEM）, and the mechanism of friction coefficient change was discussed. The the main reasons for ablation and started shaking were analyzed based on friction coefficient. The friction coefficient of micro-car clutch friction material increases with the friction surface temperature firstly, then tends to stabilization and at last decreases, the stable working temperature range is 130 -220 ℃. When surface temperature of micro-car clutch is low, the torque transferred by clutch is not sufficient to overcome the road resistance of micro-car starting for the friction coefficient is small, which results in start shaking phenomenon for the micro-car. When surface temperature of friction material is higher, the friction material has low friction coefficient during clutching, which results in low torque transfer efficiency, long slipping friction time and the clutch ablation.