1、3.重合度的物理意义m=2m=2m=2m=2主动轮基圆啮合线m=2m=2m=2m=2m=2m=2m=2m=2m=2m=2m=2m=2a=1.3的实例m=2m=2局部放大N1N2B1B2Ppb0.3pb1.3pb现演示啮合过程N1N2B1B2Ppb0.3pb1.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb影线表示同时参加啮合的齿廓N1N2B1B2Ppb0.3pb1.3pb影线表示啮合点的
2、轨迹N1N2B1B2Ppb0.3pb1.3pb0.3pb该点已达终止啮合点B2同时有两对齿在啮合的啮合线长度pbN1N2B1B2Ppb0.3pb1.3pb0.3pb只有一对齿在啮合的啮合线长度N1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pb0.7pb单对齿啮合的啮合线长度*重合度a表明了同时参加啮合的齿对数的多少重合度a=1.3表示，在一个基圆齿距内单对齿啮合的啮合线度占70%，两对齿啮合的啮合线度占30%N1N2B1B2Ppb0.3pb1.3pb0.3pb0.7pb 重合度大，表明每对轮齿的受载小，从而提高了齿轮的承载能力。在一般情况下，齿轮传动的重合度愈大愈好。
