JSS2 Basic Technology Lesson Note on Belt and Chain Drives

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TOPIC: BELT AND CHAIN DRIVES.

Period ONE:  Belt and Chain drives.

Content:  Definition, examples/types of belt and chain drives, belt tensioning.

• Drives
• Belt drive
• Types of belt drive
• Belt tensioning
• Application of belt drive
• Chain drive
• Application of chain drive
• Difference between chain drive and gear drive

Drives:  Drives are devices used to transmit rotary motion from one shaft to another.

The drive mechanism is used in transmitting power from one location to another

There are three types of drives:

1. Belt and pulley drive
2. Chain drives
3. Gear drives

Belt drive

This is a device used to transfer power/motion from one shaft to another shaft parallel to it and at some distance away. Belt drives are often used in place of chain drive when slip is not so important to be taken into consideration. Hence, belt cannot provide positive drive because slip occurs from time to time.

Types of belt drive

There are two types of belt drive based on the shape of the belt:

1. Straight (flat) belt
2. V- shaped belt

Belt can be lapped over the groove pulley in two styles. This includes:

1. Straight belt lap: Here the two pulleys join by the belt rotate in the same direction.
2. Cross belt lap: Here the two pulleys join by the belt rotate in opposite

 Belt tensioning

Sometimes, a belt in use is slack and may be slipping over the pulley. Such belts that are not taut do not transmit motion/power effectively thereby wasting energy. This could be prevented by tensioning the belt drive.

To tension a belt, another pulley (wheel called the idler) mounted on a separate shaft is used.

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