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What are train wheels parts called?

The assembly of the axles and wheels is called a wheelset. We produce narrow and standard gauge wheelsets for the full range of domestic railway cars, from high-speed cars to on-site factory rail cars, as well as export goods. Our annual production capacity is 10,000 pairs.



A train wheel is part of a complex assembly called a wheelset, and each component has a specific technical name. The Tread is the slightly conical surface that actually makes contact with the rail; its cone shape is vital for "self-steering" the train around curves. On the inner side of the wheel is the Flange, a raised edge that prevents the train from derailing by keeping the wheels locked between the rails. The central portion that connects to the axle is the Hub (or "boss"). Some wheels are "monobloc" (one single piece of steel), while others use a separate Tyre (a replaceable steel ring around the perimeter) to allow for easier maintenance when the surface wears down. These wheels are press-fitted onto the Axle, a solid steel shaft that ensures both wheels rotate at exactly the same speed. The entire unit sits within a Bogie (or truck) undercarriage, which uses Bearings to reduce friction and allow the heavy assembly to spin smoothly under the weight of the train.

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A bogie in the UK, or a railroad truck, wheel truck, or simply truck in North America, is a structure underneath a railway vehicle (wagon, coach or locomotive) to which axles (hence, wheels) are attached through bearings. In Indian English, bogie may also refer to an entire railway carriage.

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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. (They also have a flange, or raised edge, on the inner side to prevent the train from falling off the tracks.)

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Squeal is generated from lateral slip between wheel and low rail. Further, it is understood that squeal occurrence is dependent on the friction behaviour in combination with the size and direction of the forces acting in the contact patch; more specifically, the presence of the so-called 'stick?slip loop.

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