Question

field application of worm and worm wheel

Answer 1

Worm and Worm wheel application can be seen all around us.

anything we want to lift.

few simple examples are collected below.

1. Shutter lifting mechanism at opining and closing times at stores.

2. Gate opening mechanism.

3.Lifts: Worm screws are also used in lifts or screw conveyors

These devices contain a wide, fixed or variable pitch helical screw which rotates inside a housing, moving the product from the input to the output end. See thispresentation for further details.

 

4.Automotive steering systems

One of the steering systems of a car has a worm screw as its basic component. In these systems, the worm screw constantly engages with a spur gear. The screw connects to the steering wheel through a “steering column”, and the wheel does so to the steering arm. Thanks to this mechanism, for each turn of the steering wheel, the car’s wheel turns by a certain angle which depends on the gear ratio in use.

 

5.Speed reducers

Worm drive speed reducers are widely used across various industrial applications since they offer significant gear ratios in small spaces. On the other hand,transmission of the movement is performed at 90°, which allows for the transmission to be performed at a right angle.



As a drawback, worm screw speed reducers are subjected to greater frictiondue to their sliding, which causes highoperation temperatures and greaterenergy expenditures.

While we are discussing worm drive types, we can name a few, such as the helical worm, sectional screw flights, paddle screw, hourglass worm screw and long pitch worm screw, among others.

 

6.Engagement between the worm screw and the worm gear

There are 3 major characteristics for the proper engagement between the two components of a worm drive:

The gear ratio: it is important to measure the ratio of the angular speed of the screw (driving gear) and the worm gear (driven gear).The angle of the helix: the helices of the screw and the worm gear must have the same orientation, while the sum of their helix angles must equal the angle between the shafts.Distance between the centres: the base cylinders must be tangential to each other. It means that the distance between centres of the worm gear will be equal to the semisum of their diameters.