148 Module 13 • Chain drives 13.3 The applications/uses of chain drives
Chain drives are not as flexible as belt drives but are stronger and more efficient, because no slipping occurs.
• Chain drives transmit power or motion from the driving to the driven sprocket, especially where centre distances between the two are too big for gear usage.
• Chain drives are used where a positive transmission is required.
• Chain drives are used where tension in the drive is high (belts will slip) e.g. timing chain of a motor vehicle (see illustration below).
Figure 13.4 Timing chain mechanism
13.4 Advantages and disadvantages of chain drives compared to gears and belt drives
General advantages of chain drives
• Transmission of power in chain drives is not achieved by friction. • Relatively high speeds can be maintained, the drive is compact. It can operate in both directions.
• It is not affected by cold, heat or moisture. • Power transmission in chain drives can take place over a wide field. • Chain drives deliver a positive acceleration ratio, because the chain does not slip.
Advantages of a chain drive over belt drives
• Te chain drive is absolutely direct and no slipping occurs. • Chain drives do no slip or creep (unlike belts), they maintain a positive speed ratio between the driving and driven sprockets.
• Chain drives have an efficiency of 98% (no energy loss because of friction) and maintain a positive speed ratio over their entire life.
• Chain drives are little affected by heat, dust or dirt that ensures a long lifespan.
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