Why are the train wheels designed to be conical with one side of the wheel having a greater circumference than the other?

The wheels on each side of a train car are connected with a metal rod called an axle. This is where the wheels’ geometry comes in. To help the wheels stay on the track their shape is usually slightly conical. This means that the inside of the wheel has a larger circumference than the outside of the wheel.

What causes hunting oscillation?

A classical hunting oscillation is a swaying motion of a railway vehicle (often called truck hunting or bogie hunting) caused by the coning action on which the directional stability of an adhesion railway depends. It arises from the interaction of adhesion forces and inertial forces.

What is coning of wheels and canting of rails?

On curve outer wheel have to travel greater distances than inner wheels due to centrifugal force the axle moves towards outer rail and due to coning the diameter of wheels on outer rail increases and decreases on inner rails. This helps to cover greater distance than inner wheels without adverse effect.

Which of the following component of a railway track establishes the transverse ties for the rails?

Rail sleepers
Rail sleepers are an important part of railway components. In general, they are also called railroad ties, railway ties or crossties. In order to keep the correct distance of gauge, the rail sleeper usually lays between the two rail tracks.

Why does my house shake when a train goes by?

As the train moves along thetrack, the result is an oscillating force at each wheel/track contact, and this is transmitted to the ground at each sleeper/ground contact. It’s this force that shakes the ground.

Do locomotives have differentials?

Trains however do not have differentials. If they did, there would be a risk of them falling off their tracks! Trains have fixed wheelsets, but still must navigate turns.

What are the disadvantages of coning of wheels?

Disadvantages of Coning of Wheel

• The pressure on the horizontal component of force near the inner edge of outer rail has a tendency to wear the rail quickly.
• The horizontal component has to turn the rail outwards and hence the gauge may be widened.

What are the advantage of coning of wheels?

Advantages of Coning of Wheels Reduce the wear and tear of the wheel flanges and rails, which is due to the rubbing action of flanges with inside faces of rail head. Provide possibilities of lateral movement of the axle with its wheels on rail curves.

How long do railroad tracks last?

Train rails last anywhere from 3 to 100+ years. Curves wear out a lot faster than straight sections of track do. On a really busy section of railroad, the curves could be replaced every two to three years. On a lightly used section of track, or a siding, you could easily find rail made in the 1920’s, or even earlier.

On what factors does the mode of distribution of load on the track depends upon?

On what factors does the mode of distribution of load on the track depends upon? Explanation: The load acting on the track is distributed to the sleepers, ballast and the formation. Consequently Stiffness of rail and elasticity of bed are the factors which govern the mode of distribution of load.

What is equivalent conicity of lateral wheelset displacement?

The equivalent conicity is determined by the rolling radius difference due to lateral wheelset displacement. The rolling radius difference is dependent on the contact angle between wheel and rail and on the local curvatures of wheel and rail profiles.

Why are the wheels of a car made of conical shape?

To overcome this challenge, the wheels instead of being in a cylindrical shape are made in a conical shape. The smaller surface area of the wheel faces outwards, and the larger surface area faces inwards of the axle. Why choose this way?

How do train wheels rotate?

A lot of thought went into designing the train wheels. The wheels are fixed on the axle in unison. This means if the left wheel rotates by X degrees then even the right wheel rotates by the same. The complication arises when the train is making a turn. You can’t expect it to travel in a straight line always, can you?

How do you find the rolling radius difference?

Generally, the rolling radius difference is a non-linear function of the lateral displacement y of a wheelset, which from geometrical considerations (Figure 2) can be written as: ∆=ryy2()γ , (2) where γ is the wheel conicity.

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