滚针轴承的设计计算

NA系列滚针轴承的设计计算,,,,,,,,

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一、已知条件,,,,,,,,

轴承型号,NA4822,轴承外径(D),140,轴承内径(d),110,轴承游隙(Gr)min,,0.050

滚针内径(Fw),120,轴承宽度(B),30,装配倒角rsmin,1.1,轴承游隙(Gr)max,,0.090

二、分步设计计算,,,,,,,,

1.主参数优化,,,,,,,,

1.1滚针直径的选择：KDmin（D-Fw）≤Dw≤KDmax（D-Fw）,,,,,,,,

,KDmin为：,0.25,KDmax为：,0.36,Dwmin为：,5,Dwmax为：,7.2

根据标准滚针的尺寸和本轴承用滚针的约束条件选择滚针为：,,,,,Dw：,6,Dwp为：,126

1.2滚针长度的确定：B-KLmax*Dw≤Lw≤B-KLmin*Dw,,,,,,,,

,KLmin为：,0.8,KLmax为：,2.1,Dwmin为：,17.4,Dwmax为：,25.2

根据标准滚针的尺寸和本轴承用滚针的约束条件选择滚针为：,,,,,Lw:,21.8,Lwe为：,19.6

1.3滚针个数的确定：π*Dwp/(K2max*Dw)≤Z≤π*Dwp/(K2min*Dw),,,,,,,,

,K2min为：,1.55,K2max为：,1.9,Dwmin为：,34.72286617,Dwmax为：,42.56351337

根据设计经验、以往范列和轴承用钢球的特性确定钢球个数为：,,,,,Z：,,42,

1.4轴承径向额定动载荷的：Cr=bm*fc*(Lwe)7/9*Z3/4*Dwe29/27；,,,,,,,,

材料和加工质量修正系数bm:,,,1.1,几何形状、制造精度和材料系数fc:,,,73.42,

,将各项参数值代入动载荷的计算公式得：,,,Cr：(kN),92.37,,,

1.5轴承径向额定静载荷的：Cor=44*(1-Dwe/Dwp)*Z*Lwe*Dwe,,,,,,,,

,将各项参数值代入静载荷的计算公式得：,,,Cor：(kN),206.98,,,

1.6圆弧修正线母线修型滚针的设计,,,,,,,,

,测量点t1:t1=rmin,,0.4,,Qmax:Qmax=Cr/Z,,,2.20

,t:t=0.15(Lw-2t1),,3.2,δ:δ=3.85*10-5Qmax0.9/(Lw-2t1)0.8,,,,0.003

,Rc:Rc=((Lw-2r)2-(Lw-2*t1-2*t)2)/8/δ,,,,8442.436176,,,

2.套圈设计,,,,,,,,

2.1内外圈滚道直径di、De的确定：di=Fw；De=Fw+2*Dw,,,,,,,,

,内沟直径di:,,120,di允差：,-0.015/-0.030,,Fw允差：,+0.058/+0.036

,外沟直径De:,,132,De允差：,+0.051/+0.023,,,

2.2外圈滚道宽度E的确定：E=Lc=Lw+ε,,,,E:,22,,E允差：,+0.010

2.3挡边宽度C2：C2=0.5*(B-E),,,,C2:,4,,C2允差：,-0.1

2.4套圈挡边直径：D2=Dpw+KD2*Dw,,,,,,,,

,KD2的值为：,,0.35,外圈挡边直径D2：,128.1,D2允差：,,+0.010

2.5内圈两端锥面宽度a2:a2=C2-0.18*Dw,,,,a2:,2.9,,a2允差：,-0.1

2.6内圈两端锥面半锥角β=11°20′,,,,,,,,

2.7内圈滚道宽度E1的确定：E1=B-2*a2,,,,E1:,24.2,,,

2.8内圈锥面直径d3:d3=di-0.4*a2,,,,d3:,119.6,,d3允差：,±0.1

2.9套圈润滑油孔、润滑油槽的确定：,,,,,,,,

,孔位置an:,15,an允差：,±0.1,孔直径dy:,5,dy允差：,+0.30

,槽半径R:,7,R允差：,+0.50,槽深h:,1,an允差：,±0.1

2.10越程槽尺寸,,,mmax:,1,m1max:,0.5,,

2.11装配倒角r与非装配倒角：,,,,,,,,

,由rsmin值为：,1.1,,,,,,

,rsmax,径向：,2.5,装配倒角r,径向：,2,r3:,0.8

,,轴向：,4,,轴向：,2,r8:,0.5

2.6标志中心圆直径(Dk）的确定：Dk=((D-2*r径向max)+(D2max+2*r3)/2,,,,,,,,

,D2max为：,128.11,代入参数Dk为：,,132.4,,,

2.7标志面有效宽度(hw）的确定：hw=((D-2*r径向max)-(D2max+2*r3))/2,,,,,,,,

,,,代入参数hw为：,,2.6,,,

2.8标志字体高hz查表9为：,,,,1.5,,,,

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3.M型保持架设计,,,,,,,,

3.1保持架中心圆直径Dcp:Dcp=Dpw,,,,Dcp:,126,,Dcp允差：,±0.025

3.2保持架钢板厚度Sc:Sc=0.25*Dw,,,,Sc:,1.5,,Sc允差：,±0.05

3.3保持架外径Dc:Dc=Dcp+Sc,,,,Dc:,127.5,,Dc允差：,-0.250

3.4保持架内径Dc1:Dc1=Dcp-0.75*Dw,,,,Dc1:,121.5,,Dc允差：,+0.250

3.5保持架宽度Bc:Bc=Lw+(0.6～1.8)*Dw,,,,Bc:,29,,Bc允差：,-0.2/-0.55

3.6保持架窗孔圆周宽度bc:bc=Dw+0.1,,,,bc:,6.1,,bc允差：,+0.05

3.7保持架窗孔长度Lc:Lc=Lw+0.1,,,,Lc:,21.9,,Lc允差：,+0.01

3.8窗孔端部至保持架断面宽度Sb:Sb=0.5(Bc-Lc),,,,Sb：,3.55,,Sb允差：,-0.1

3.9斜梁夹角2β统一取为80°,,,,,,,,

3.10内横梁窗孔宽度bc2:bc2=(Dc1+2Sc)*sincos-1(((Dc1+2Sc)2+Dcp2-Dw2)/(2*Dcp*(Dc1+2Sc)))+0.05,,,,,,,,

,,代入参数bc2:,,5.82,,,bc2允差：,+0.05

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