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2. Wheel hub assembly - Wikipedia

   en.wikipedia.org/wiki/Wheel_hub_assembly

   The hub assembly is located between the brake drums or discs and the drive axle. A wheel is bolted on it. Depending on the construction, the end of the hub comes equipped with the splined teeth. They mate the teeth on the axle shaft. The axle hub spins along with the wheels bolted to it and provide power to the wheels in order to rotate.

3. Semi-trailer - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer

   Generally speaking, most North American type trailers use two axles with dual-tire hubs totaling 8 wheels, while most European type trailers use three axles with single-tire hubs totaling 6 wheels, with one of the axles being able to be lifted for lighter loads and saving on tire, brake, and axle wear.

4. Semi-trailer truck - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_truck

   Conventional style cab tractor A cab-over semi-tractor Tractor with an end-dump trailer A FAW semi-trailer truck in China A semi-trailer truck (also known by a wide variety of other terms – see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel. Other terms There are a ...

5. Centreless wheel - Wikipedia

   en.wikipedia.org/wiki/Centreless_wheel

   The Skatecycle is a device similar to a caster board, but with hubless wheels and a 2-axis twisting axle replacing the function of the casters. The central axle connects two standing platforms surrounded by 9" polyurethane hubless wheels, giving said wheels the appearance of stirrups. In order to move the unit, the rider rotates their feet ...

6. Axle - Wikipedia

   en.wikipedia.org/wiki/Axle

   The overall assembly can carry more weight than a semi-floating or non-floating axle assembly because the hubs have two bearings riding on a fixed spindle. A full-floating axle can be identified by a protruding hub to which the axle shaft flange is bolted. The semi-floating axle setup is commonly used on half-ton and lighter 4×4 trucks in the ...

7. S-cam - Wikipedia

   en.wikipedia.org/wiki/S-cam

   Generally speaking, a tractor trailer requires more brakes than a typical vehicle, so making the brakes as simple and as cost effective as possible is very important. [ citation needed ] S-cams are very efficient at keeping brakes maintained because as the brake pad wears, the S-cam rotates more and causes the pads to further.