渐开线标准直齿圆柱齿轮的传动和加工Transmission.pptx

渐开线标准直齿圆柱齿轮的传动和加工Transmissionandmachiningofinvolutestandardstraightcylindricalgears主讲人：张瑞静

目录CONTENTS1234渐开线齿轮的正确啮合条件Correctmeshingconditionsforinvolutegears渐开线齿轮的连续传动条件Continuoustransmissionconditionsofinvolutegears渐开线齿轮的加工Machiningofinvolutegears根切现象与最少齿数Undercuttingphenomenonandminimumnumberofteeth

1渐开线齿轮的正确啮合条件CorrectmeshingconditionsforinvolutegearsONE

一、渐开线齿轮的正确啮合条件Correctmeshingconditionsforinvolutegears正确啮合是指齿轮副在传动时保证不出现重叠或侧隙过大而引起卡死或冲击现象，各轮齿依次啮合互不干扰，实现连续顺利传动。Correctmeshingreferstoensuringthatthegearpairdoesnotoverlaporhaveexcessivebacklashduringtransmission,causingjammingorimpact.Theteethofeachgearmeshinsequencewithoutinterferingwitheachother,achievingcontinuousandsmoothtransmission.

一、渐开线齿轮的正确啮合条件CorrectmeshingconditionsforinvolutegearsPb1=Pb2Abletoengagecorrectly能正确啮合Pb1Pb2Unabletoengagecorrectly不能正确啮合Pb1Pb2Unabletoengagecorrectly不能正确啮合从外观看齿1比齿2小从外观看齿1比齿2大

一、渐开线齿轮的正确啮合条件Correctmeshingconditionsforinvolutegears渐开线齿轮的正确啮合条件:Correctmeshingconditionsforinvolutegears:Pb1=Pb2Pb=πcosαπm1cosα1=πm2cosα2●模数相等，m=m1m2Equalmodulus,m=m1m2●分度圆上的齿形角相等，α1=α2Thetoothshapeanglesontheindexingcircleareequal,α1=α2

2渐开线齿轮的连续传动条件ContinuoustransmissionconditionsofinvolutegearsTWO

二、渐开线齿轮的连续传动条件Continuoustransmissionconditionsofinvolutegears前一对轮齿尚未结束啮合，后继的一对轮齿已进入啮合状态。Thepreviouspairofteethhasnotyetfinishedmeshing,andthesubsequentpairofteethhasenteredameshingstate.

二、渐开线齿轮的连续传动条件Continuoustransmissionconditionsofinvolutegears两轮连续传动的条件为B1B2≥PbTheconditionfortwowheelcontinuoustransmissionisB1B2≥Pb

二、渐开线齿轮的连续传动条件Continuoustransmissionconditionsofinvolutegears一对齿轮的重合度:ε=B1B2/PbTheconditionfortwowheelcontinuoustransmissionisε=B1B2≥Pb一对齿轮的连续传动条件是:ε≥1Thecontinuoustransmissionconditionsforapairofgearsare:ε≥one从理论上讲，重合度为ε=1，齿轮副就能保证连续传动，但齿轮制造和安装有误差，实际上必须使重合度ε1才能可靠保证传动的连续性。Intheory,thedegreeofoverlapisε=