机械设计基础4第4章齿轮机构-重合度课件

3.重合度的物理意义3.重合度的物理意义1m=2m=2m=2m=22m=2m=2主动轮基圆啮合线m=2m=2主动轮基圆啮合线3m=2m=2m=2m=24m=2m=2m=2m=25m=2m=2m=2m=26m=2m=2m=2m=27m=2m=2m=2m=28m=2m=2a=1.3的实例m=2m=2a=1.3的实例9m=2m=2局部放大m=2m=2局部放大10N1N2B1B2Ppb0.3pb1.3pb现演示啮合过程N1N2B1B2Ppb0.3pb1.3pb现演示啮合过程11N1N2B1B2Ppb0.3pb1.3pbN1N2B1B2Ppb0.3pb1.3pb12N1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pb13N1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pb14N1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pb15N1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pb16N1N2B1B2Ppb0.3pb1.3pb影线表示同时参加啮合的齿廓N1N2B1B2Ppb0.3pb1.3pb影线表示同时参加啮17N1N2B1B2Ppb0.3pb1.3pb影线表示啮合点的轨迹N1N2B1B2Ppb0.3pb1.3pb影线表示啮合点的轨18N1N2B1B2Ppb0.3pb1.3pb0.3pb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该点已达19N1N2B1B2Ppb0.3pb1.3pb0.3pb只有一对齿在啮合的啮合线长度N1N2B1B2Ppb0.3pb1.3pb0.3pb只有一对20N1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pb21N1N2B1B2Ppb0.3pb1.3pb0.3pb0.7pb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%N1N2B1B2Ppb0.3pb1.3pb0.3pb0.7p22N1N2B1B2Ppb0.3pb1.3pb0.3pb0.7pb

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。N1N2B1B2Ppb0.3pb1.3pb0.3pb0.7p233.重合度的物理意义3.重合度的物理意义24m=2m=2m=2m=225m=2m=2主动轮基圆啮合线m=2m=2主动轮基圆啮合线26m=2m=2m=2m=227m=2m=2m=2m=228m=2m=2m=2m=229m=2m=2m=2m=230m=2m=2m=2m=231m=2m=2a=1.3的实例m=2m=2a=1.3的实例32m=2m=2局部放大m=2m=2局部放大33N1N2B1B2Ppb0.3pb1.3pb现演示啮合过程N1N2B1B2Ppb0.3pb1.3pb现演示啮合过程34N1N2B1B2Ppb0.3pb1.3pbN1N2B1B2Ppb0.3pb1.3pb35N1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pb36N1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pb37N1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pb38N1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pb39N1N2B1B2Ppb0.3pb1.3pb影线表示同时参加啮合的齿廓N1N2B1B2Ppb0.3pb1.3pb影线表示同时参加啮40N1N2B1B2Ppb0.3pb1.3pb影线表示啮合点的轨迹N1N2B1B2Ppb0.3pb1.3pb影线表示啮合点的轨41N1N2B1B2Ppb0.3pb1.3pb0.3pb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该点已达42N1N2B1B2Ppb0.3pb1.3pb0.3pb只有一对齿在啮合的啮合线长度N1N2B1B2Ppb0.3pb1.3pb0.3pb只有一对43N1N2B1B2Ppb0.3pb1.3pb0.3pbN1N2B1B2Ppb0.3pb1.3pb0.3pb44N1N2B1B2Ppb0.3pb1.3pb0.3pb0.7pb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.