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A tandem axle is defined as two or more consecutive axles whose centers are spaced more than 40 inches (102 cm) but not more than 96 inches (244 cm) apart. [10] Axles spaced less than 40 inches (102 cm) apart are considered a single axle. [11] In effect, the formula reduces the legal weight limit for shorter trucks with fewer axles (see table below
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 ...
The relationship between axle weight and spacing, known as the Federal Bridge Gross Weight Formula, is designed to protect bridges. [36] A standard 18-wheeler consists of three axle groups: a single front (steering) axle, the tandem (dual) drive axles, and the tandem trailer axles. Federal weight limits for NN traffic are: [37]
A ladder frame with beam axles is used. There is a single front axle on semi-elliptical leaf springs. The base rear suspension is a Mack tandem with two powered axles, a single rear drive axle with an undriven pusher axle is available. Wheelbases are from 174 to 203 inches (440 to 520 cm) A set-back front axle is used.
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).
A multi-axle bus is a bus or coach that has more than the conventional two axles (known as a twin-axle bus), usually three (known as a tri-axle bus), or more rarely, four (known as a quad-axle bus). Extra axles are usually added for legal axle load restriction reasons, or to accommodate different vehicle designs such as articulation, or rarely ...