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  2. Gama Goat - Wikipedia

    en.wikipedia.org/wiki/Gama_Goat

    The Gama Goat was a six-wheel drive semi-amphibious off-road vehicle originally developed for use by the US military in the Vietnam War.The Goat uses an articulated chassis, so that from distance it appears to be a four-wheel drive vehicle pulling a two-wheel trailer, but it is a single six-wheel vehicle with a four-wheel steering arrangement with the front and rear wheels turning in opposite ...

  3. Kalamazoo Manufacturing Company - Wikipedia

    en.wikipedia.org/wiki/Kalamazoo_Manufacturing...

    A roller chain connected the transmission to the rear axle. Timken roller bearings, 16-inch (410 mm) insulated wheels, and cast iron four-wheel brakes, were standard, adding up to a weight of 895 pounds (406 kg) without a cab. The 57W contained an air-cooled Wisconsin 4-cycle 1-cylinder motor, rated at 9.2 horsepower (6.9 kW).

  4. Semi-trailer - Wikipedia

    en.wikipedia.org/wiki/Semi-trailer

    Many semi-trailers have wheels that are capable of being totally dismounted and are also relocatable [6] (repositionable) to better distribute load to bearing wheel weight factors. [7] Semi-trailers are more popular for transport than full trailers, which have both front and rear axles. Ease of backing is cited as one of the semi's chief ...

  5. Fifth-wheel coupling - Wikipedia

    en.wikipedia.org/wiki/Fifth-wheel_coupling

    A wheel would be placed on the rear frame section of the truck, which at the time had only four wheels, making the additional wheel the "fifth wheel". The trailer needed to be raised so that the trailer's pin would be able to drop into the central hole of the fifth wheel. Fifth wheels were originally not a complete circle and were hand forged.

  6. 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.

  7. Bogie - Wikipedia

    en.wikipedia.org/wiki/Bogie

    In trucking, a bogie is the subassembly of axles and wheels that supports a semi-trailer, whether permanently attached to the frame (as on a single trailer) or making up the dolly that can be hitched and unhitched as needed when hitching up a second or third semi-trailer (as when pulling doubles or triples).