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Gear

Gears are toothed cylindrical wheels used for mechanical power transmission from one rotating shaft to another. Power transmission also done by belts, chains, hydraulic and electrical systems. If the distances of power transmission is large, belts and chains can be used. But when a compact, then the best option is gear drives. The gear drive is very efficient and competitive for transmission of power with high torque and high speed. The amount of torque transmitted through the gears depends on the number of teeth and the size of the gears. Higher the gear ratio, higher the torque An additional benefits of gear drives is quick reversibility.

Types of Gears

According to the tooth profiles.

·         Spur Gears

·         Helical Gears

·         Bevel Gears

·         Worm Gears

·         Spiral Gears

·         Rack and pinion

·         Planetary Gears (Epicyclic gearing)

Function of a Gear Box 

Gear box is to vary the speed of a machine depends on Torque.

Power is the function of speed and torque. In other words, power is product of torque and speed (P = TV) of the shaft. By varying the sizes of gears, the torque and speed of driven member can be changed.

Types of Gearbox

1.    Sliding mesh type gearbox

2.    Constant-mesh type gearbox

3.    Synchromesh gearbox

4.    Epicyclic (or) Planetary gearbox

Types of Gear Trains

1.    Simple Gear Train

2.    Compound Gear Train

3.    Reverted Gear Train

4.    Epicyclic Gear Train (or) Planetary gear trains

·         Simple epicyclic gear trains

·         Compound epicyclic gear trains