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  2. Caster - Wikipedia

    en.wikipedia.org/wiki/Caster

    However, the larger the diameter of a caster wheel, the higher the caster support arm must be. Either the base of a low-hanging object must be lifted higher above the wheels, or the casters must hang out to the sides straddling the low-hanging supported object. While rotating around the vertical shaft, swivel caster wheels sweep out a space.

  3. Ball transfer unit - Wikipedia

    en.wikipedia.org/wiki/Ball_transfer_unit

    However, casters recognise a trail, meaning that the wheels had to align before directional change could be achieved. Ball transfer units can also be used in a non-inverted ball down position as a type of caster, however this use is restricted by load-bearing limitations and the type of floor.

  4. Wheel hub assembly - Wikipedia

    en.wikipedia.org/wiki/Wheel_hub_assembly

    A roller bearing between the axle hub and axle shaft ensures easy rotation of the non-drive wheels. On the axle side, it is mounted to the holding bracket from the chassis; on the disc side, the wheel is mounted to the bolts of the WHA. When replacing, a wheel hub assembly should be torqued to the vehicle's specifications to prevent failure. [1]

  5. Rolling-element bearing - Wikipedia

    en.wikipedia.org/wiki/Rolling-element_bearing

    A cylindrical roller bearing. Roller bearings are the earliest known type of rolling-element-bearing, dating back to at least 40 BC. Common roller bearings use cylinders of slightly greater length than diameter. Roller bearings typically have a higher radial load capacity than ball bearings, but a lower capacity and higher friction under axial ...

  6. Thrust bearing - Wikipedia

    en.wikipedia.org/wiki/Thrust_bearing

    Thrust ball bearings, composed of bearing balls supported in a ring, can be used in low-thrust applications where there is little axial load. Cylindrical thrust roller bearings consist of small cylindrical rollers arranged flat with their axes pointing to the axis of the bearing. They give very good carrying capacity and are cheap, but tend to ...

  7. Tapered roller bearing - Wikipedia

    en.wikipedia.org/wiki/Tapered_roller_bearing

    Tapered roller bearings were a breakthrough at the end of the 19th century because bearings used in wheel axles had not changed much since ancient times. They consisted of a cylindrical seat on the frame and part of the axle enclosed in a case or box that held a lubricant.

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    Get answers to your AOL Mail, login, Desktop Gold, AOL app, password and subscription questions. Find the support options to contact customer care by email, chat, or phone number.

  9. Roller coaster wheel assembly - Wikipedia

    en.wikipedia.org/wiki/Roller_coaster_wheel_assembly

    Running wheels (also known as road wheels or tractor wheels): positioned on the top of the rail, bearing the weight of the train. Side friction wheels: positioned on a horizontal plane, either inside or outside of the rails. These hug the sides of the rail, keeping the train centered.

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