Coning of Wheels in Railway

Coning of Wheels

The art of providing an outward slope of 1 in 20 to the treads of wheels of rolling stock is known as coning of wheels.

Different Types of Bearings
Different Types of Bearings

The coning of wheels is provided to keep the vehicle in the central position with respect to the track and helps the vehicle to move smoothly on the straight and curved track.

In the case of a straight and level track (which shown in the figure:1), the flanges of wheels have an equal perimeter.

Coning of Wheels - For Straight Track

But in the case of curved track, the situation will be different which shown in the figure:2. In this situation, the outer rail has to cover a greater distance than that of the inner rail. Also, due to the action of centrifugal force on a curve, the vehicle has a tendency to move out towards the outer rail.

Coning of Wheels - For Curved Track

To overcome this, the circumference of the flange of outer wheel is made greater than that of the inner wheel and this helps the outer wheel to travel a longer distance than the inner wheel.

The object of Providing Coning of Wheels

Coning of wheels is done to achieve the following object:
1. To reduce the wear and tear of the wheel flanges and rails.
2. To prevent lateral movement of trains.
3. To prevent the wheels from slipping to some extent.

Read more:

Hogged, Buckling, And Tilting of Rails

Creep of Rails