Helical Gear

Plastic Helical Gears

Helical gears are quieter and operate more efficiently than spur gears. The teeth of a helical gear are cut at an angle to the gear face so that they gradually mesh as the gear rotates. The tangent to the helix angle varies in proportion to the thrust load. A helical gear is an excellent choice for high thrust because it produces far less friction and requires fewer bearings.

In addition to higher load capacity, helical gears are quieter and have less friction than spur gears. Since helical gears mesh in small increments, they are better suited for large loads and are also more efficient in high speed and high load applications. They are also a good choice for conveyor belts and elevators, and they can be used with parallel or non-parallel shafts.

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Features of Plastic Helical Gears:

Plastic helical gears, having their teeth cut at an angle, are widely used. The meshing between a helical gear and a worm is smoother and quieter than spur gears since the teeth on helical gears are specially cut at an angle, so when two teeth on the gear system engage, it starts a contact on one end of the tooth which gradually spreads with the gear rotation, until the time when both the tooth are fully engaged.


Type Helical Gear
Module M0.1 – M2.0
Material Polyacetal (POM) / Nylon
Bore Ø1.40mm/ Ø1.90mm/ Ø2.05mm/ Ø2.40mm/ Ø2.55mm / Ø2.90mm/ Ø3.05mm (Flexible)
Outer Diameter Ø10.0mm – Ø50.0mm (Flexible)
Face Width (L) 2.0mm – 10.0mm (Flexible)

A gear is a toothed wheel designed to transmit force to another gear or toothed component. The teeth of a gear can be shaped to minimize wear, vibration, and noise and maximize power transmission efficiency. Gears of differing sizes are often used in pairs for a mechanical advantage, allowing the torque of the driving gear to produce an enormous torque in the driven gear at a lower speed or a smaller torque at a higher rate.

The Advantages of Plastic Helical Gears:

  1. Plastic helical gears are easily molded into various shapes, giving them a more comprehensive range of configurations.
  2. Plastic helical gears are less expensive and are lighter in weight.
  3. Plastic helical gears are chemical and corrosion-resistant.
  4. Plastic helical gears have a quieter and smoother operation and more efficient drive geometry.
  5. Plastic helical gears are inherent self-lubricating.

While plastic helical gears offer these many advantages over metal gears, their practical use requires proper design and engineering to account for possible dimensional and property variations over the expected range of operating conditions.

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Helical Gear Video