名 称中心距蜗杆头数蜗轮齿数齿形角模数传动比齿数比蜗轮变位系数蜗杆直径系数蜗杆轴向齿距蜗杆导程蜗杆分度圆直径蜗杆齿顶圆直径蜗杆齿根圆直径顶隙渐开线蜗杆齿根圆直径蜗杆齿顶高蜗杆齿根高蜗杆齿高蜗杆导程角渐开线蜗杆基圆导程角蜗杆齿宽蜗轮分度圆直径蜗轮喉圆直径蜗轮齿根圆直径蜗轮齿顶高蜗轮齿根高蜗轮齿高蜗轮咽喉母圆半径代 号az1z2amiux2qpapzd1da1df1cdb1ha1hf1h1rrbb1d2da2df2ha2hf2h2rg2蜗轮齿宽蜗轮齿宽角蜗杆轴向齿厚蜗杆法向齿厚蜗轮齿厚蜗杆节圆直径蜗杆节圆直径b2θsasnstd1'd2'计 算 关 系 式a=(d1+d2+2x2m)/2说 明按规定选取按规定选取按传动比确定aa=20。或an=20。m=ma=mn/cosri=n1/n2u=Z2/Z1当蜗杆主动时,i=ux2=a/m-(d1+d2)/2mq=d1/mpa=πmpz=πmz1d1=mqda1=d1+2ha1=d1+2ha*mdf1=d1-2hf1=da-2(ha*m+c)c=c*mdb1=d1.tgr/tgrb=mz1/tgrbha1=ha*m=1/2(da1-d1)hf1=(ha*+c*)m=1/2(da1-df1)h1=hf1+ha1=1/2(da1+df1)tgr=mz1/d1=z1/qcosrb=cosr.cosan见表11－4d2=mz2=2a-d1-2x2.mda2=d2+2ha2df2=d2-2ha2ha2=1/2(da2-d2)=m(ha*+x2)hf2=1/2(d2-df2)=m(ha*-x2+c*)h2=ha2+hf2=1/2(da2-df2)rg2=a-1/2(da2)按蜗杆类型确定按规定选取蜗杆为主动，按规定选取按规定选取按规定按规定由设计确定由设计确定θ=2arcsin(b2/d1)sa=1/2(πm)sn=sa.cosr按蜗杆节圆处轴向齿槽宽ea'确定d1'=d1+2x2m=m(q+2x2)d2'=d2
