Helical Gear Manufacturer

A helical gear has teeth in form of helix around the gear. Two such gears may be used to connect two parallel shafts in place of spur gears. The helixes may be right handed on one gear and left handed on the other. 

The pitch surfaces are cylindrical as in spur gearing, but the teeth instead of being parallel to the axis, wind around the cylinders helically like screw threads. • The teeth of helical gears with parallel axis have line contact, as in spur gearing. This provides gradual engagement and continuous contact of the engaging teeth.

Terminology of helical gear: 
1. Pitch circle. It is an imaginary circle which by pure rolling action, would give the same motion as the actual gear. 
 2. Pitch circle diameter. It is the diameter of the pitch circle. The size of the gear is usually specified by the pitch circle diameter. It is also called as pitch diameter. 
3. Pitch point. It is a common point of contact between two pitch circles. 
4. Pitch surface. It is the surface of the rolling discs which the meshing gears have replaced atthe pitch circle.

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