COUPLINGS and Clutches Machinery's Handbook, 31st Edition
2527
Cast-iron Friction Clutches
For sizes not given below: a = 2 D b = 4to8 D c = 2 1 ∕ 4 D t = 1 1 ∕ 2 D e = 3 ∕ 8 D h = 1 ∕ 2 D s = 5 ∕ 16 D , nearly k = 1 ∕ 4 D Note: The angle φ of the cone may be from 4 to 10 degrees
t
k
φ
e
e
a
D
D
b
c
s
a
e
h
e
D
a 2 2
b
c
t
e
h
s
k
1
4-8
1 1 2 2 3 3 3 4 4 4 5 5 6 6 6 7 7 7 8 8 9
2 1 ∕
1 ∕ 7 ∕ 1 ∕ 5 ∕ 3 ∕ 3 ∕ 1 ∕ 1 ∕ 7 ∕ 1 ∕ 5 ∕ 3 ∕ 3 ∕ 1 ∕ 1 ∕ 7 ∕ 1 ∕ 5 ∕
3 ∕ 1 ∕ 5 ∕ 5 ∕ 3 ∕ 7 ∕
1 ∕ 5 ∕ 3 ∕ 7 ∕
5 ∕ 3 ∕ 1 ∕ 5 ∕ 5 ∕ 5 ∕ 3 ∕ 7 ∕ 7 ∕
1 ∕ 5 ∕ 3 ∕ 7 ∕ 1 ∕ 9 ∕ 5 ∕
4
2
8 2 8 8 4 8
2 8 4 8
16
4
5-10
1 1 ∕ 1 1 ∕ 1 3 ∕ 2 1 ∕ 2 1 ∕ 2 3 ∕ 2 3 1 ∕ 3 1 ∕ 3 3 ∕ 4 1 ∕ 4 1 ∕ 4 3 ∕ 3 4 5 1 ∕ 5 1 ∕ 5 3 ∕ 5
2 3 4 5 5 6 7 7 8 9 9
1 ∕
7 ∕ 3 ∕
4 2 4 4 2 4 4 2 4 4 2 4 4 2 4
2
8 8
8
8 2 8 8 8 4 8 8
16
3 6-12
4 8
8
7-14
3
1 ∕
2
16
4 8-16
1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 3
4 1 ∕
2
2
9-18 10-20 11-22 12-24 13-26 14-28 15-30 16-32 17-34 18-36 19-38 20-40 21-42 22-44 23-46 24-48
4 5 5 6 6 7 7 8 8 9 9
1 ∕
1 ∕ 1 ∕ 3 ∕ 1 ∕ 5 ∕ 3 ∕ 7 ∕ 1 ∕ 1 ∕ 3 ∕ 1 ∕ 5 ∕ 3 ∕ 7 ∕
2
8 4 8 2
8 4 8 2 8 4
16
1 1 1 1 1 1 1 1 1 1 2 2 2 2
5 ∕ 1 ∕
8 4 4 8
8
1 ∕
11 ∕
2
16
6 3 ∕
1 ∕ 1 ∕ 3 ∕ 3 ∕ 5 ∕ 3 ∕ 3 ∕ 7 ∕
3 ∕
8 4 8 8 2 8 4 4
4
1 1 1 1 1 1 1 1 1 1 1 1
1 ∕
3 ∕ 7 ∕ 1 ∕
13 ∕
2
8
16
7 ∕
8
4 8
8
1 ∕
1 ∕ 1 ∕ 3 ∕ 3 ∕ 1 ∕ 1 ∕ 5 ∕ 3 ∕ 3 ∕ 7 ∕
15 ∕
2
2
8
4 4 8 8 2 2 8 4 4 8
16
1 1 1 1 1 1 1 1 1
1 1 ∕
1 ∕
1 ∕
1 ∕ 1 ∕ 3 ∕ 1 ∕ 5 ∕ 3 ∕ 7 ∕ 1 ∕
2
2 4 4 4 4 8
8 4 8 2
8 4 8 2 8 4
16
10 10
1 ∕ 3 ∕
8
1 ∕
2
16
10
11 1 ∕
8
4
10 11 11
11 12 13
1 ∕
3 ∕
2
8
16
3 ∕
4 8
8
1 ∕
1 ∕ 1 ∕
2
4 4
8
16
6
12
13 1 ∕
2
2
Frictional Coefficients for Clutch Calculations.— While the frictional coefficients used by designers of clutches differ somewhat and depend upon variable factors, the following values may be used in clutch calculations: For greasy leather on cast iron about 0.20 or 0.25, leather on metal that is quite oily 0.15; metal and cork on oily metal 0.32; the same on dry metal 0.35; metal on dry metal 0.15; disk clutches having lubricated surfaces 0.10. Formulas for Cone Clutches.— In cone clutch design, different formulas have been de- veloped for determining the horsepower transmitted. These formulas, at first sight, do not seem to agree, there being a variation due to the fact that in some of the formulas the friction clutch surfaces are assumed to engage without slip, whereas, in others, some al- lowance is made for slip. The following formulas include both of these conditions:
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