5. Bearing maintenance
Wheel and flange profiles are subject to wear for a variety of reasons:
in the tapered part of the bearing, friction in contact with adhesion, which leads to deterioration of the surface finish through deformation and removal of material;
braking force, when applied by means of brake shoes rubbing on the wheel profile;
parasitic axle movements, particularly yawing, which accentuate wear, but do not significantly degrade the slope value;
crossing curves in the track, which, if accompanied by guiding contact on the flange, cause wear and therefore thinning of the flange;
the crossing of switches and crossings, which causes contact between the inner face of the flange and the guide rail
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Bearing maintenance
Railway rolling stock and the environment
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