GEAR

What is a gear...?

A circular or cylindrical component, having tooth on its periphery which is used to transmit power from one shaft to another is called a gear. Gears are used to transmit motion from one shaft to another or between a shaft and a slide. This is accomplished by successively engaging teeth.

Gears use no intermediate link or connector and transmit the motion by direct contact. In this method, the surface of two bodies make a tangential contact. The two bodies have either a rolling or a sliding motion along the tangent at the point of contact. No motion is possible along common normal as that will either break the contact or one body will tend to penetrate into the other.

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CLASSIFICATION OF GEARS

Gears can be classified according to the relative positions of their shaft axes are as follows--

1.   Parallel shafts

(a) Spur gears

Fig-1.a.1

Fig-1.a.2

(b) Spur rack and pinion

Fig-1.b

(c) Helical gears or Helical spur gears

Fig- 1.c

(d) Double helical and Herringbone gears

Fig -1.d

2. Intersecting shafts

(a) Straight bevel gears

Fig- 2.a.1

Fig-2.a.2

(b) Spiral bevel gears

Fig-2.b

(c) Zerol bevel gears

Fig-2.c

3. Some other types of gears

(a) Crossed helical gears

Fig-3.a

(b) Worm gears

Fig-3.b

(c) Hypoid gears

Fig-3.c

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