The bulge of the pulley mainly eliminates the belt slippage when the pulley rotates, because the belt tends to move to the farthest distance from the axis of the pulley due to centrifugal force, and it is only possible when the belt is in the middle of the pulley.
Belt material.
The material used for the belt must be strong enough, flexible and durable, and have a high coefficient of friction and withstand high tension.
The belt used for power transmission is composed of any of the materials listed below.
1. Balata.
Rubber straps are manufactured using rubber straps obtained from trees.
2. Fabric.
The belt is made of canvas or cotton cloth impregnated with rubber and is suitable for warm climates.
3. Canvas.
If the belt is made of cotton, it is called a canvas belt. Canvas belts are cheap, resistant to moisture and can run at high speeds.
These belts can be produced in suitable width, thickness and length, and can be used in warm climates.
4. Rubber.
The rubber belt cannot be used in the presence of grease, nor can it withstand high temperatures. In rubber belts, fabric is first used for manufacturing, and then rubber materials are coated on it.
5. Leather.
Generally, the common material used for belts is leather because they can withstand moderate temperatures and are relatively low cost.
However, belts are not suitable for high-temperature applications because the shape and size of the belt may change due to high temperatures.
However, the belt has a high coefficient of friction and high power transmission capability.
The ends of the belt can be connected together by riveting, lacing or gluing.
In the process of connecting the ends of the belt, the ends of the belt are first overlapped and riveted with suitable rivets, or the ends of the belt are butted, and then the shoelaces are threaded.
However, due to the improved methods available, leather and rubber belts are produced by gluing methods. This will give the belt joint the highest strength.
