直齿圆柱齿轮结构设计

直齿圆柱齿轮结构设计

传递功率P=15KW 输入转速r=1460r/min 传动比i=3单向运转，有轻微冲击，单

σ F lim 2 = 415MPa安全系数 许用齿根应力 取SF=1.4

[σ ] = σ FlimSF

[σ ]F 1 = 316MPa [σ ]F 2 = 296MPaYFS1=4.06 YFS2=3.96

(2)验算齿根应力 复合齿形系数 由表 3-6 ,经线性插值 2 KT 1 2 × 1.5 × 9.8 × 10 4 × 4.06 YFS 1 = MPa bd 1 m 70 × 70 × 2 YFS 1 3.96 = 121.8 × MPa YFS 2 4.06 F1

齿根应力

σ F 1=

σ F 1 = 121.8MPa σ F 2 = 118.8MPa

σ F 2 =σ

由于 σ F 1 < [σ ]F 1 , σ F 2 < [σ ]F 2 ,故 弯曲疲劳强度足 够 4 齿轮几何尺寸的确定 齿顶圆直径 d a 由《机械零件设计手册》得 h*a =1 c* = 0.25

d a1 = d1 + 2ha1 = Z 1 + 2ha m = (35 + 2 × 1) × 2 = 74(mm) d a 2 = d 2 + 2ha 2 = Z 2 + 2ha m = (105 + 2 × 1) × 2 = 214(mm)齿距 齿根高 齿顶高 齿根圆直径 d p = 2×3.14=6.28(mm)

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d a1 =74mm d a 2 =214mmp=6.28mm s=3.14mm hf=2.5mm ha=2mm h=4.5mm df1=65mm df2=205mm

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h f = h a + c m = 2.5(mm)ha = h a m = 1 × 2 = 2(mm)f

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d f 1 = d 1 2h f = 70 2 × 2.5 = 65(mm) d f 2 = d 2 2h f = 210 2 × 2.5 = 205(mm)