Spur Gear vs Helical Gear vs Bevel Gear vs Worm Gear: Difference and Comparison

Key Takeaways

  1. A spur gear features straight teeth aligned with the gear axis, transmitting motion efficiently.
  2. A helical gear possesses slanted teeth, offering smoother operation by distributing the load across multiple teeth.
  3. A bevel gear with conical teeth and intersecting axes is ideal for changing direction between non-parallel shafts.
  4. A worm gear is a screw-like gear engaging with a toothed wheel and provides substantial reduction ratios.

What is Spur Gear?

A spur gear is a cylindrical gear with teeth that are parallel to the gear’s axis. It is the simplest type of gear.


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It provides high-power transmission and is easy to manufacture but cannot be quiet due to the straight teeth engagement. It is used in applications where precision and efficiency are not critical.

What is Helical Gear?

Helical gears have teeth inclined at an angle to the gear’s axis. This angled tooth arrangement allows for smoother operation as compared to spur gears.

These gears distribute the load over multiple teeth, which reduces wear and enhance efficiency. They are used in high-precision and power-type transmission applications, such as automotive transmission.

What is a Bevel Gear?

Bevel gears have teeth that are conically shaped and mounted on intersecting axes. They transmit motion and power between non-parallel shafts at right angles.

They can be straight-toothed (straight angle) or have curved teeth (spiral bevel), offering options for load capacities and smoothness of operation.

What is Worm Gear?

A worm gear consists of a screw-like gear meshing with a toothed wheel. It provides high gear reduction ratios and is often used to transmit motion between perpendicular shafts.

These gears offer self-locking capabilities, which prevents back driving. This feature makes them suitable for applications where the equipment must hold its position without additional braking mechanisms.

Difference Between Spur Gear, Helical Gear, Bevel Gear and Worm Gear

  1. Spur gear consists of straight teeth parallel to the gear axis; helical gear has slanted teeth at an angle to the gear axis; bevel equipment has conical teeth on intersecting axis at right angles; worm gear has screw-like teeth engaging with the worm wheel’s teeth.
  2. Spur gears can produce more noise; helical gears offer smoother operation; bevel gears provide quieter motion, while worm gears can be noisy.
  3. Spur gears concentrate load on a limited number of teeth; helical gears distribute load across multiple teeth, reducing wear; bevel gears distribute the load over larger contact areas, while worm gears spread the load over various teeth, enhancing strength.
  4. Spur and helical gears are used for parallel shafts; bevel bags are suitable for perpendicular shafts with varying angles, while worm gears often transmit motion between non-parallel shafts.
  5. Spur gears are used in low-speed applications where noise is not a concern; helical gears are standard in automotive transmissions and industrial machinery; bevel gears are used in gearboxes, different drives and steering systems, while worm gears are used in conveyor systems, lifts and situations requiring position locking.

Comparison Between Spur Gear, Helical Gear, Bevel Gear and Worm Gear

ParametersSpur GearHelical GearBevel GearWorm Gear
Tooth arrangementStraight teeth parallel to the gear axisSlanted teeth at an angle at gear axisConical teeth on intersecting axis at right anglesScrew-like teeth engaging with the worm wheel’s teeth
NoiseMore noiseSmooth operationQuieterNoisy
Load distributionOn a limited number of teethAcross multiple teethOver larger contact areasOver multiple teeth
Shaft orientationParallel shaftsParallel shaftsPerpendicular shafts with varying anglesNon-parallel shafts
ApplicationsLow-speed applicationsAutomotive transmissions and industrial machineryGearboxes, different drives and steering systemsConveyor systems, lifts and situations requiring position locking
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