单支撑和双支撑是小型活塞压缩机中2种重要的曲轴支撑方式.从理论分析、模拟计算及实验测试几个方面研究这2种曲轴支撑结构及其设计参数对曲轴的受力和摩擦耗功的影响.研究结果表明:双支撑结构的曲轴受力要优于单支撑结构曲轴;对于单支撑结构曲轴来讲,适当增大下支撑到曲拐的距离L,减小上支撑到曲拐的距离X,是减小曲轴受力和摩擦耗功的有效手段;对于双支撑结构曲轴来讲,其摩擦力和摩擦功耗主要取决于曲拐所受的连杆力大小及零件的工艺情况,如果加工水平较高的话,双支撑结构的摩擦耗功比单支撑要小.%Single support and dual support are two important crankshaft structures in small type piston compressors. In this paper, the effects of the two structures and their parameters on crankshaft force and friction power have been analyzed with the method of theo-retical analysis, simulations, and experiment verifications. The results show that the crankshaft force of dual support structure is better than single support structure. For the single support structure, increasing the distance of L and decreasing the distance of X will be effective to reduce the crankshaft force and friction power. For the dual support structure, the friction force and friction power mainly depends on the connecting force on the crankshaft and the processing level of the compressor. If the processing level is high, the friction power of the dual support structure is less than the single support structure.
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