Figure 15.2 shows flat belt and V-belt. In the flat belt drive, rim of pulley is slightly crowned which helps to keep the belt running centrally on the pulley rim as shown in Figure 15.2(a). For the V-belt drive, grooves are made on rim of pulley for wedging action. The belt does not touch the bottom of the groove as shown in Figure 15.2(b). Owing to wedging action, V-belts need little adjustment and transmit more power, without slip, as compared to flat belts. In multiple V-belt system, more than one belt on the pulleys can be used to increase the power transmission capacity.
Figure 15.2 Type of Belt Cross-Sections: (a) Flat Belt and (b) V-Belt
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