Belt Drive
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06-10-2010, 09:09 AM


A belt is a looped strip of flexible material, used to mechanically link two or more rotating shafts.
They may be used as a source of motion, to efficiently transmit power, or to track relative movement. Belts are looped over pulleys.
In a two pulley system, the belt can either drive the pulleys in the same direction, or the belt may be crossed, so that the direction of the shafts is opposite.

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30-08-2013, 02:58 PM


.ppt   BELT DRIVES.ppt (Size: 294.5 KB / Downloads: 28)

Functions of belts

Transmit motion between shafts that are located at a considerable distance from each other
They are not used for exact fixed speed ratio
They are very flexible
distance or
the angle between the two shafts.

Selection of V-Belts

Power to be transmitted
Speed of the small or large pulley
Speed ratio
Field of application.
Approximate distance between the centres of the two pulleys

Steps of V-belts Selection:

Determine the service factor Based application, table (5.2).
Obtain the design power from the equation:
Design power = transmitted power x service factor
Select a suitable belt size from fig.(5.3)

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