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GEARS
BY
PA
TR
I CK
CO
ME
L L A
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SPUR GEARS
Simple gear, just a disc/cylinder with spikey teeth jutting out from the radius.
In spur gears teeth suddenly meet at a line contact across their entire width, causing stress and noise.
Spur gears make a characteristic whine at high speeds.
Spur gears are used for low speed applications and those situations where noise control is not a problem.
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WORM GEARS
Screw-like gear. Cylinder with spiraling ridges down the inside.
A worm gear is usually meshed with a spur gear or a helical gear
The worm can always drive the spur, but if the spur is too small, it cant always push the worm
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CROWN GEARS
Bevel that looks like a crown
Crown gears are a particular form of bevel gear whose teeth project at right angles to the plane of the wheel; in their orientation the teeth resemble the points on a crown.
A crown gear can only mesh perfectly with another bevel gear, although crown gears are sometimes meshed with spurs
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ROTARY TO LINEAR MOTION
Using a gear’s rotation to move a meshed object forward/backward
Mechanical linear actuators typically operate by conversion of rotary motion into linear motion.
A screw, wheel, and music-box are all linear actuators that convert rotary motion to linear motion