What Is Worm Gearbox

Worm Gearbox

Worm gears are an old style of gear, and a model of one of the six easy machines. Generally, a worm gear is a screw butted up against what looks as if a trendy spur tools with barely angled and curved teeth.

Worm gears and helical gears are the two main types of gears that are widely used in several Industrial applications. Conventionally one would go for a helical gearbox design over a worm gearbox. But advances in the worm gearbox design has not only closed the efficiency gap but has also given worm gearboxes a competitive edge over helical gearbox.

Worm Gearbox

A worm gear is a gear which includes a shaft with a spiral thread that engages with and drives a toothed wheel. Worm gears are an antique fashion of
gear, and a model of one of the six easy machines. Basically, a worm gear is a screw butted up in opposition to what looks as if a widespread spur gear
with barely angled and curved teeth.

It modifications the rotational motion via way of means of ninety degrees, and the aircraft of motion additionally modifications because of the location of the worm on the worm wheel (or simply “the wheel”). They are commonly constructed from a metallic bug and a brass wheel.

A worm gear – or worm drive as it’s miles occasionally related to – is a specific gear composition. A screwworm – interlocks with a gear/wheel just like a spur gear. The set-up lets in the equipment operator to outline rotational speed. The set-up additionally lets in for a better force to be transmitted.

How the Worm gear works?

Here you can get Worm gear working. Worm gear are used within large equipment as well as in things in the home. In their purest form, worm gears are seen in the tuning mechanism of an acoustic guitar.

When power is applied to the worm, it rotates against the wheel, transferring power to the worm wheel, causing the wheel to thrust against the load. This set-up allows the determination of speed, and for high torque to be transmitted. A worm gear is designed to bear loads that are otherwise known to produce high shock. They are vastly known for the low noise levels and their relatively low maintenance. The worm gear is also used as a brake system.

An electric motor or engine applies rotational power via to the worm. The worm rotates against the wheel, and the screw face pushes on the teeth of the wheel. The wheel is pushed against the load.

The Different Types Of Worm Gear

There are basically 3 types of worm gear – Non-throated, single-throated and double-throated.

  • The non-throated worm gear is an out-and-out worm that does not include a grooved mechanism. 
  • A single-throated worm includes curved helical teeth being blanketed across the worm. 
  • The double-throated worm gear has curved teeth on each the gear plus the worm screw.

Worm Gear Uses

Worm gears can be seen in several mechanisms and devices. They are used within large equipment as well as in things in the home. In their purest form, worm gears are seen in the tuning mechanism of an acoustic guitar.

The first one is the high reduction ratio. A worm gear can have a massive reduction ratio with little effort – all one must do is add circumference to the wheel. Thus you can use it to either greatly increase torque or greatly reduce speed. It will typically take multiple reductions of a conventional gearset to achieve the same reduction level of a single worm gear – meaning users of worm gears have fewer moving parts and fewer places for failure.

A second reason to use a worm gear is the inability to reverse the direction of power. Because of the friction between the worm and the wheel, it is virtually impossible for a wheel with force applied to it to start the worm moving.


  • The use of a worm screw reduced this effect. Further worm drive development led to recirculating ball bearings to reduce frictional forces, which transmitted some steering force to the wheel.
  • This aids vehicle control and reduces wear that could cause difficulties in steering precisely.
  • Worm drives are a compact means of substantially decreasing speed and increasing torque.
  • Small electric motors are generally high-speed and low-torque; the addition of a worm drive increases the range of applications that it may be suitable for, especially when the worm drive’s compactness is considered.
  • Worm drives are used in presses, rolling mills, conveying engineering, mining industry machines, on rudders, and worm drive saws. In addition, milling heads and rotary tables are positioned using high-precision duplex worm drives with adjustable backlash.
  • Worm gears are used on many lift/elevator and escalator-drive applications due to their compact size and the non-reversibility of the gear.


No comments yet. Why don’t you start the discussion?

Leave a Reply