heavy truck

  • 800.00 Rs.
  • Published date: August 7, 2016
    • Lahora, Barpeta, Assam, India

Heavy-duty trucks are assembled from component parts. Each truck manufacturer usually builds its own cabs, and a few also build their own engines, transmissions, axles, and other major components. In most cases, however, the major components (and many of the other components) are built by other companies and are shipped to the truck assembly plant. In most plants, the trucks move along an assembly line as components are added by different groups of workers at successive workstations. The truck starts with a frame assembly that acts as the "backbone" of the truck and finishes with the completed, fully operational vehicle being driven off the end of the assembly line under its own power. Today's most recognized form of heavy-duty truck, the tractor-trailer, or semi truck, was commercially developed in the 1910s. Some truck designers believed tractors, motor trucks designed only to pull separable trailers, could make truck operation profitable. If tractors easily connected to trailers, the more costly motorized tractors could remain busy hauling full trailers, while leaving less expensive trailers idle during loading or unloading. In 1911, truck designer Charles Martin built a gasoline powered tractor to pull modified horse-drawn commercial wagons. His most significant innovation, however, was the fifth wheel coupler. A round plate with a central hole, it attached to the top of tractor frames to connect and support trailers. Buyers converted wagons into semi-trailers by raising them with jacks and removing their front axles. Lowering and locking a trailer's bottom mounted kingpin into a tractor's fifth wheel coupled the vehicles. Martin's Rocking Fifth Wheel handled the period's rough roads. It allowed tractor-trailers to bend when turning, but also accommodated the ups and downs of uneven surfaces. Nearly every truck manufacturer purchased Martin's popular device.

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