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  2. False brinelling - Wikipedia

    en.wikipedia.org/wiki/False_brinelling

    Almen found that wheel bearings were damaged before they were used by customers. Furthermore, he found that the bearings were more damaged for long-distance shipping of the cars and that the season of shipping also had an influence. The reason for the damaged bearings were micro-oscillations [17] which occurred due to the shipping. The small ...

  3. Rolling resistance - Wikipedia

    en.wikipedia.org/wiki/Rolling_resistance

    Figure 1 Hard wheel rolling on and deforming a soft surface, resulting in the reaction force R from the surface having a component that opposes the motion. (W is some vertical load on the axle, F is some towing force applied to the axle, r is the wheel radius, and both friction with the ground and friction at the axle are assumed to be negligible and so are not shown.

  4. Rolling contact fatigue - Wikipedia

    en.wikipedia.org/wiki/Rolling_contact_fatigue

    Rolling the wheel continuously causes imperceptible deformations of the plane and, once passed to a subsequent point, the plane returns to its initial state. In the compression phase the plane opposes the motion of the wheel, while in the decompression phase it provides a positive contribution to the motion.

  5. Bearing (mechanical) - Wikipedia

    en.wikipedia.org/wiki/Bearing_(mechanical)

    A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.

  6. Run-out - Wikipedia

    en.wikipedia.org/wiki/Run-out

    In addition, irregular run-out is the result of worn or rough bearings which can manifest itself as either axial or radial run-out. Run-out will be present in any rotating system and, depending on the system, the different forms may either combine increasing total runout, or cancel reducing total runout.

  7. ABEC scale - Wikipedia

    en.wikipedia.org/wiki/ABEC_scale

    The ABEC scale is designed to provide bearing manufacturers dimensional specifications that meet the standards of precision bearings in a specified class. The scale is also used by manufacturers who produce equipment that require bearings must also know the dimensional tolerances to design parts that will accommodate a bearing.

  8. Hot box - Wikipedia

    en.wikipedia.org/wiki/Hot_box

    A hot box is the term used when an axle bearing overheats on a piece of railway rolling stock. [1] The term is derived from the journal-bearing trucks used before the mid-20th century. The axle bearings were housed in a box that used oil-soaked rags or cotton (collectively called "packing") to reduce the friction of the axle against the truck ...

  9. Ball bearing - Wikipedia

    en.wikipedia.org/wiki/Ball_bearing

    Preloading of a pair of bearings in a wheel assembly of an inline skate. There are several common designs of ball bearing, each offering various performance trade-offs. They can be made from many different materials, including stainless steel, chrome steel, and ceramic (silicon nitride, Si 3 N 4). A hybrid ball bearing is a bearing with ceramic ...

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