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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. |
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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. |
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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 ? |
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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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