Cross-belt drive is used to provide reverse direction of rotation to driven shaft as the direction of rotation of driving shaft.
Similar to open-belt drive, let A and B be the pulley centres and CD and EF be the common tangents to the two pulleys as shown in Figure 15.4.
Figure 15.4 Crossed-belt Drive
In Figure 15.4, belt length, L = 2 (Arc GC + CD + Arc DH)
Example 15.2: Two shafts drive are arranged parallel to each other at a distance of 5 m. If the pulley diameters mounted on the shafts are 500 mm and 750 mm. Determine the difference in length of the belts for opposite direction of rotation and same direction of rotation.
Solution:
For opposite direction of rotation crossed-belt drive is used and for same direction of rotation open-belt drive is used.
For open-belt drive:
Difference in length of cross belt and open belt = 12.041 − 11.966 = 0.0743 m
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