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GEARS AND GEAR SYSTEMS

V. Ryan © 2010-16

 
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Gears can be found in many machines in a workshop or factory and at home they are often an important part of mechanical devices. In a car the gears help the driver to increase and decrease speed as he/she changes the gears with the gear stick.

Can you name and describe a mechanical device with gears, that you or your friends use ?

 The gears shown below are called spur gears because they mesh together. Gear ‘A’ is called the ‘driver’ because this is turned by a motor. As gear ‘A’ turns it meshes with gear ‘B’ and it begins to turn as well. Gear ‘B’ is called the ‘driven’ gear.

 
 

 

 
Gear ‘A’ has 30 teeth and gear ‘B’ has 20 teeth. If gear ‘A’ turns one revolution, how many times will gear ‘B’ turn ?


Which gear revolves the fastest ?
 

 

When gear 'A' completes one revolution gear 'B' turns 1.5 revolutions (1½ times)

 
You should have also found the gear ‘B’ revolves the fastest. A basic rule of gears is - if a large gear (gear ‘A’) turns a small gear (gear ‘B’) the speed increases.
On the other hand, if a small gear turns a large gear the opposite happens and the speed decreases.
 
 
 

 

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