Helical gearing

Table of contents

  • What is helical gearing?
  • Where is helical gearing used?
  • Advantages and disadvantages of helical gearing
 

What is helical gearing?

Helical gears are suitable for conveying highly viscous media. With helical gearing, the teeth no longer run in a straight line in alignment, but at an oblique angle to it. Helical gearing is particularly suitable for transmitting high torques. Especially in the polymer sector, where highly viscous melts have to be conveyed at high pressures, helical gearing is the first choice.

Due to the wandering engagement point from one side to the other, which is created by the rotation of the shafts, this type of gearing has low pulsation. Especially in (highly) viscous polymer applications, this ensures very uniform polymer delivery. In addition, undesirable vibrations in pipelines of upstream and downstream aggregates, etc. can be avoided as a result.

 

Where is helical gearing used?

Helical gearing is mainly used as standard gearing in polymer pumps where a volume flow with as little pulsation as possible is required. Due to its properties, helical gearing ensures consistently high product quality. This gearing can also be used for applications with differential pressures up to 250 bar.

Operating parameters

Viscosities:
Medium to high viscosities
Differential pressure:
250 bar
Volumetric efficiency:
high
Pulsation:
Less pulsation than the spur gearing
 

Pro & Contra

Pro helical gearing:

With helical toothing, the feed behavior is improved because the entire tooth space does not have to be filled at once, but the feed area moves from one side to the other. The noise level is also significantly lower than with straight toothing.

  •     Improved feed behavior
  •     Lower noise development
  •     Higher torque
  •     Higher pressure

Contra helical gearing:

Unlike spur gearing, helical gearing also generates axial forces. However, the acting forces vary depending on the helix angle and the differential pressure. The higher the differential pressure, the higher the axial thrust.

Use of helical gearing at WITTE:

Other types of gearing