Section 17 Strength and Durability of Gears - SDP/SI

ELEMENTS OF METRIC GEAR TECHNOLOGY
I
4.1
4.0
3.9
3.8
3.7
3.6
x = –0.2
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x = –0.3
x = –0.4
x = –0.5
Standard Pressure Angle
α n = 20°
Addendum h a = 0.850 m
Dedendum h f = 1.038 m
Corner Radius of Tool
γ = 0.12 m
Spiral Angle β m = 35°
Metric
0 10
3.7
3.6
R
T
1
2
3
3.5
3.4
x = –0.1
3.5
3.4
4
Radial Tooth Profile Factor (Form Factor) YFO
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
x = 0.2
x = 0.3
x = 0.4
x = 0.1
x = 0
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
5
6
7
8
9
2.4
x = 0.5
2.4
10
2.3
2.2
2.3
2.2
11
2.1
2.0
12 13 14 15 16 17 18 19 20 25 30 35 40 45 50 60 80 100
2.1
2.0
200 400 ∞
Equivalent Spur Gear Number of Teeth, z v
Fig. 17-9 Radial Tooth Profile Factor for Spiral Bevel Gear
12
13
14
15
T-175
A