Engineering student Association of Tumsar

Guess which type of pump is it ?

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Ram Jhula Nagpur

A gear or cogwheel is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part to transmit torque. Geared devices can change the speed, torque, and direction of a power source. Gears almost always produce a change in torque, creating a mechanical advantage, through their gear ratio, and thus may be considered a simple machine. The teeth on the two meshing gears all have the same shape.[1] Two or more meshing gears, working in a sequence, are called a gear train or a transmission. A gear can mesh with a linear toothed part, called a rack, thereby producing translation instead of rotation.

The gears in a transmission are analogous to the wheels in a crossed, belt pulley system. An advantage of gears is that the teeth of a gear prevent slippage.

When two gears mesh, if one gear is bigger than the other, a mechanical advantage is produced, with the rotational speeds, and the torques, of the two gears differing in proportion to their diameters.

In transmissions with multiple gear ratios—such as bicycles, motorcycles, and cars—the term "gear" as in "first gear" refers to a gear ratio rather than an actual physical gear. The term describes similar devices, even when the gear ratio is continuous rather than discrete, or when the device does not actually contain gears, as in a continuously variable transmission.[2]

Contents [hide]
1 History
2 Comparison with drive mechanisms
3 Types
3.1 External vs internal gears
3.2 Spur
3.3 Helical
3.3.1 Skew gears
3.4 Double helical
3.5 Bevel
3.6 Spiral bevels
3.7 Hypoid
3.8 Crown
3.9 Worm
3.10 Non-circular
3.11 Rack and pinion
3.12 Epicyclic
3.12.1 Sun and planet
3.13 Harmonic gear
3.14 Cage gear
3.15 Magnetic gear
4 Nomenclature
4.1 General nomenclature
4.2 Helical gear nomenclature
4.3 Worm gear nomenclature
4.4 Tooth contact nomenclature
4.5 Tooth thickness nomenclature
4.6 Pitch nomenclature
5 Backlash
6 Shifting of gears
7 Tooth profile
8 Gear materials
9 Standard pitches and the module system
10 Manufacture
11 Gear box designing
11.1 Procedure for a stepwise solution
11.2 Speed chart
11.3 Gear box diagram
11.4 Inspection
12 Gear model in modern physics
13 Gear mechanism in natural world
14 See also
15 References
16 Further reading
17 External links

bevel gear