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English: Diagram showing a side view and underside of a conventional 18-wheeler semi-trailer truck with an enclosed cargo space. The underside view shows the arrangement of the 18 tires (wheels). Shown in blue in the underside view are the axles, drive shaft, and differentials.
A cab over semi-tractor. Tractor with an end-dump trailer. A FAW semi-trailer truck in China. A semi-trailer truck[ 1] (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 .
History. The M915 is the namesake and basis of a tactical truck series, although it is not tactical itself. It is a commercial type conventional 6x4 rear wheel drive 14-ton semi-tractor designed for use on improved roads. A powered front axle and other tactical equipment are not needed for this role, allowing a lighter and simpler truck.
It was founded as Brockway Carriage Works in 1875 by William Brockway. His son George Brockway later turned the carriages into a truck manufacturer in 1909. The first trucks were high-wheelers. During World War I, Brockway built 587 Class B Liberty Trucks for the military. After the war they produced a new range from 1-ton to 5-tons.
The fifth-wheel coupling provides the link between a semi-trailer and the towing truck, tractor unit, leading trailer or dolly. The coupling consists of a kingpin, a 2-or- -inch-diameter (50.8 or 88.9 mm) vertical steel pin protruding from the bottom of the front of the semi-trailer, and a horseshoe-shaped coupling device called a fifth wheel ...
1950. In 1950 the next generation of tactical trucks were being developed. Sizes were rationalized, with 1⁄4 and 3⁄4 -ton 4x4s and 21⁄2, 5, and 10-ton 6x6s. Trucks were military standard designs, 6x6 trucks used common cabs and similar fender and hood styles. [ 14] M422 1⁄4 -ton 4x4. M38A1 1⁄4 -ton 4x4. M274 1⁄2 -ton 4x4.
Semi-trailer. A tractor unit pulling a semi-trailer. A truck pulling a semitrailer using a trailer dolly. A semi-trailer is a trailer without a front axle. The combination of a semi-trailer and a tractor truck is called a semi-trailer truck (also known simply as a "semi-trailer", "tractor trailer", or "semi" in the United States ). [ 1]
M916 truck, tractor, Light Equipment Transporter (LET), 6 × 6 w/winch – M915 (truck) M917 truck chassis, 8 × 6 (for 20-ton dump truck) – M915 (truck) M918 truck chassis, 6 × 6 (for 1500 gal bituminous distributor) – M915 (truck)