Machine Drawing

Pulleys 143

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12

65

40

50

132138

145

f 36

18

(a)

X

X

KEYWAY, 8 4 ́

f 36

(^2020)

X

X

18

12

f

264

f

(^100) f^80
f

276

f

290

65

X-X

Fig. 9.1 Pulley with arms

Flat belts are used when the centre distance between the two shafts is more. However,

V-belts are preferred when the shafts are located closer. The V-belt drive is relatively slip free.

It is used for transmission ratios upto and above 15:1 without tension pulleys. The contact

area between the belt and pulley can be increased and thus the power transmission can also be

enhanced.