NMRV Worm Gear Unit

1. Single stage transmission ratio can be between 5-100, or even higher.
2. It is suitable for the occasions that require high noise in the working environment, such as food processing workshops and precision instrument production workshops.
3. When the motor stops running, the worm gear mechanism prevents the output shaft from reversing, keeping the device in its current position.
4. It can ensure the safety and reliability of the product.
5. Mechanical efficiency can reach a high level.

Direction of transmission

Unlike ordinary gear trains, the direction of transmission (input shaft vs output shaft) is not reversible when using large reduction ratios. This is due to the greater friction involved between the worm and worm-wheel and is especially prevalent when a single start (one spiral) worm is used. This can be an advantage when it is desired to eliminate any possibility of the output driving the input. If a multistart worm (multiple spirals) is used then the ratio reduces accordingly and the braking effect of a worm and worm-gear may need to be discounted, as the gear may be able to drive the worm.

Worm gear configurations in which the gear cannot drive the worm are called self-locking. Whether a worm and gear are self-locking depends on the lead angle, the pressure angle, and the coefficient of friction.

 

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