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Which is a positive drive?

Which is a positive drive? Correct Answer Timing belt

Explanation:

Positive drive: A drive-in which slip does not occur is known as a positive drive.

In any Flat, Round, or Crossed belt drive, the belt can slip on the surface of the pulley, since there is no projection or tooth-like structure to lock it in place.

Timing Belt has projections all around the inner surface of the belt, so as to restrict the slipping between the belt and the pulley therefore it is a positive drive.

Additional Information

Following is the relation between Belt, Chain and Gear drive.

Particulars Belt drive Chain drive Gear drive

Main element

Pulleys, belt

sprockets, chain

Gear

Slip

Slip may occur

No-slip (Positive drive)

No-slip (Positive drive)

Suitability

For large centre distance

For moderate centre distance

For short centre distance

Space requires

Large

Moderate

Less

Design

Simplest

Simple

Complicated

Life

Less

Moderate

Long

Lubrication

Not required

Require

Require proper

Installation cost

Less

Moderate

More

Use

For low-velocity ratio

For moderate velocity ratio

For high-velocity ratio

Example

Use as the first drive in transmission

Bicycle, Automobile

Gearboxes, automobile

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