What is helical gearing?

Helical gearings are suitable for pumping highly viscous media. With helical gearing, the teeth no longer run in a straight line in alignment, but at an 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 caused by the shaft rotation, this tooth system has a low pulsation. Especially in high-viscosity polymer applications, this ensures very uniform polymer feeding. In addition, unwanted vibrations in pipelines of upstream and downstream units, etc. can be avoided.


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. The helical gearing ensures a simultaneously high product quality through its properties. This tooth system can be used for applications with differential pressures up to 250 bar.

Operating parameters

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

Pro & Contra

Pro helical gearing:

With helical gearing, the feeding behaviour is improved because the entire tooth gap does not have to be filled at once, but the feeding range moves from one side to the other. The noise level is also significantly lower than with spur gearing.

  • Improved feeding behaviour
  • Less noise
  • Higher torque
  • Higher pressure

Contra helical gearing:

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

Use of helical gearing at WITTE:

Other types of gearing