Section 17 Strength and Durability of Gears - SDP/SI
Section 17 Strength and Durability of Gears - SDP/SI
Section 17 Strength and Durability of Gears - SDP/SI
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ELEMENTS OF METRIC GEAR TECHNOLOGY<br />
<strong>17</strong>.5.6 Examples Of Worm Mesh <strong>Strength</strong> Calculation<br />
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Table <strong>17</strong>-35A Worm <strong>and</strong> Worm Gear Design Details<br />
No. Item Symbol Unit Worm Worm Gear<br />
m x mm<br />
degree<br />
2<br />
20°<br />
1<br />
2<br />
3<br />
4<br />
5<br />
6<br />
7<br />
8<br />
9<br />
10<br />
11<br />
12<br />
13<br />
14<br />
Axial Module<br />
Normal Pressure Angle<br />
No. <strong>of</strong> Threads, No. <strong>of</strong> Teeth<br />
Pitch Diameter<br />
Lead Angle<br />
Diameter Factor<br />
Tooth Width<br />
Manufacturing Method<br />
Surface Roughness<br />
Revolutions per Minute<br />
Sliding Speed<br />
Material<br />
Heat Treatment<br />
Surface Hardness<br />
α n<br />
z w , z 2<br />
d<br />
γ<br />
Q<br />
b<br />
n<br />
vs<br />
mm<br />
degree<br />
mm<br />
rpm<br />
m/s<br />
1<br />
28<br />
14<br />
( )<br />
4.08562<br />
Grinding<br />
3.2 µ m<br />
1500<br />
2.205<br />
S45C<br />
Induction Hardening<br />
HS 63 … 68<br />
40<br />
80<br />
–––<br />
20<br />
Hobbing<br />
12.5 µ m<br />
37.5<br />
Al BC2<br />
–––<br />
–––<br />
I<br />
R<br />
T<br />
1<br />
2<br />
3<br />
4<br />
5<br />
6<br />
Table <strong>17</strong>-35B Surface <strong>Strength</strong> Factors <strong>and</strong> Allowable Force<br />
No. Item Symbol Unit Worm Gear<br />
1 Axial Module<br />
m x<br />
2<br />
mm<br />
2 Worm Gear Pitch Diameter<br />
d 2<br />
80<br />
11 Allowable Tangential Force<br />
F t lim kgf<br />
83.5<br />
3 Zone Factor<br />
Z<br />
1.5157<br />
4 Sliding Speed Factor<br />
K v<br />
0.49<br />
5 Rotating Speed Factor<br />
K n<br />
0.66<br />
6 Lubricant Factor<br />
Z L<br />
1.0<br />
7 Lubrication Factor<br />
Z M<br />
1.0<br />
8 Surface Roughness Factor<br />
Z R<br />
1.0<br />
9 Contact Factor<br />
K C<br />
1.0<br />
10 Allowable Stress Factor<br />
S C lim<br />
0.67<br />
7<br />
8<br />
9<br />
10<br />
11<br />
12<br />
13<br />
14<br />
15<br />
T-193<br />
A
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