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Helical gears

  1. Why use a helical gear rather than a spur gear?
  2. Can a damaged parallel helical gear be easily replaced by another?
  3. What applications are crossed-axe helical gears used for?
  4. How do you use crossed-axe helical gears?
  5. How to determine whether a gear is right or left angled?

 

1. Why use a helical gear rather than a spur gear?

The angled teeth of this type of a helical gear engage more gradually and the increased number of teeth engaged at the same time means a more continuous drive.

 

It also means that helical gears run smoother and more quietly than spur gears.

 

 

 

2. Can a damaged parallel helical gear be easily replaced by another?

parallel helical gearHPC gear reducers are designed to produce a lower speed on the output compared to the input.

 

A left angled helical gear is designed to mesh with a right angled helical gear with exactly the same pressure angle.

 

As the helix angle is not standardised, it can vary from one manufacturer to another. Standard HPC gears have a helix angle of 17°45”. As the angle has a direct effect on the PCD (Pitch Circle Diameter), a parallel helical gear from HPC is not necessarily interchangeable with that from another manufacturer.

 

3. What applications are crossed-axe helical gears used for?

crossed-axe helical gearsThis type of gear produces a change of direction of the rotational forces. There is a progressive meshing due to the angle of the teeth and the number of teeth engaged at any one time is high, which assures a continuous drive. A change of direction is thus obtained and is smoother and quieter than would be obtained from using bevel gears.

 

 

 

 

4. How do you use crossed-axe helical gears?

crossed-axe helical gearsA right angled helical crossed gear meshes with another right angled gear. The relatively low efficiency due to the axial forces generated, can cause the assembly to overheat but this can be easily reduced by good lubrication.

 

 

5. How to determine whether a gear is right or left angled?

This can be done visually.  Lay the gear flat on a table and look at the teeth. If they go up towards the right, the gear is right angled; if they go up towards the left, the gear is left angled.

Technical files


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