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They often consist of at least 3 wheels per assembly, but can contain more. The typical arrangement of the wheels are: 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 ...
In January 1964, David R. Snoeyenbos, while working for General Motors Corporation, revised the design of the air caster, and filed a patent for a “reversible air bearing support”. [4] General Motors Corporation manufactured air casters, or “air bearings” for several years, then sold the rights to Snoeyenbos, who moved to Decatur ...
In particular, the air bearings are designed for lowest air consumption with the highest stiffness. High-accelerated Doppler drive The High-accelerated Doppler drive supports and guides a carbon fiber mirror (surface 500 mm × 250 mm ) with an acceleration of up to 300 m/s 2 and a flexible movement profile with high precision.
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.
Caster angle and trail both influence the steering, albeit in different ways: caster tends to add damping, while trail adds "feel" and returnability. The caster wheel on shopping carts are an extreme case – the system is undamped but stable, as the wheel oscillates around the "correct" path. The construction has relatively high trail, but no ...
Especially in steam days, wheel arrangement was an important attribute of a locomotive because there were many different types of layout adopted, each wheel being optimised for a different use (often with only some being actually "driven"). Modern diesel and electric locomotives are much more uniform, usually with all axles driven.