微型活塞空气压缩机（简称空压机）的摩擦功率占总功率的45～50％,因此,降低其摩擦功率对降低空压机的轴功率有较大的潜力。活塞和气缸装配间隙直接影响空压机的摩擦功率。实验表明,ZO40、ZO25型空压机中装配间隙由0.11mm增加到0.14mm时,其轴功率下降14.85％。 文中讨论了保持空压机最佳功率的装配间隙的实验和理论计算。 Micro-piston air compressor (hereinafter referred to as air compressor) frictional power of 45% to 50% of the total power, therefore, to reduce its frictional power to reduce air compressor shaft power has greater potential. Piston and cylinder assembly clearance directly affects the frictional power of air compressor. Experiments show that, ZO40, ZO25 air compressor assembly clearance increased from 0.11mm to 0.14mm, the shaft power decreased 14.85%. The experimental and theoretical calculation of the assembly clearance to maintain the best power of air compressor is discussed in this paper.