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(((Bevel gears are used to transfer drive through an angle of 900, . If…
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number of teeth, they are called mitre gears.
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In a simple Gear Train, very high or very low Gear Ratios can be achieved by combining very
large and very small cogs, or by using a worm and wheel.
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is easily calculated, because the worm has
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For example, if the wheel gear has 60 teeth and the worm
gear has one tooth, then Velocity Ratio is 1/60 = 1:60
• A worm and wheel can be seen in everyday use in gear box systems, where large loads are to
be lifted, e.g. bridge lifting mechanism.
• Its major advantage lies in the fact that the worm is always the drive gear, as mentioned
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attached to the same shaft. In actual fact, it is a combination
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• If there is an odd number of gears in the Gear Train, the output rotation will be the same
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• If there is an even number, the output will rotate in the opposite direction to the input.
A pulley wheel is a mechanism which helps move or lift objects. Like most wheels, pulley wheels spin
or rotate on an axis. The centre of a pulley wheel features a groove. Nested in this groove is a rope,
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Chains and sprockets provide direct drive with no slippage. They are usually used on bicycles,
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A lever is a rigid rod, pivoted about a fixed point or axis, which is known as a fulcrum.
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The Cam and Follower is a device which can convert rotary motion (circular motion) into
linear motion (motion in a straight line).
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Gears rotate on a central axis and work with other gears to transmit turning force
• The teeth of one gear mesh (or engage) with the teeth of another, as depicted below
Gears are used to transmit turning force
• They can also change the amount of force, speed and direction of rotation