Wheelset bearings

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The wheelset is stored on the bogie or on the frame of a rail vehicle by the wheelset bearing . Wheelset bearings are also known as axle bearings .

In the case of railway vehicles , the wheels are usually firmly connected to the wheelset shaft because of the sinusoidal motion and thus rotate together. Therefore, one speaks here of wheelset and accordingly of wheelset bearings.

The wheelset bearings transfer part of the vehicle mass as wheelset mass from the springs to the wheelset. They guide the wheelset laterally in the frame and also transfer longitudinal forces when the wheelset is driven or braked.

In terms of design, wheelset bearings are designed as plain bearings or roller bearings . Nowadays, slide bearings are almost only found on museum vehicles because of the significantly higher maintenance costs.

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  Wheel set with plain bearings, oil filler pipe, Lasch suspension , and ten-layer leaf springs (at Rungenwagen the dressing type, year 1922 )

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  Wheel set with SKF roller bearings, eight-layer leaf spring with double hook suspension (on Fccs hopper wagons )

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  Open SKF roller bearing on a freight car

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  Open roller bearing of a class NoHAB AA16 locomotive

Hot runner

A defective wheelset bearing that has been damaged by thermal overload is called a hot runner . The preliminary stage of the hot runner is the so-called warm runner.