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Configurations. The formula is defined as follows: A × B / C or A × B * C with: A = number of wheels (twin-mounted tires count as one wheel) B = number of driven wheels / = the fore of the rear axles is steered (pusher axle) * = the rearmost of the rear axles is steered (tag axle) C = number of steered wheels
A tandem axle is a group of two or more axles situated close together. Truck designs use such a configuration to provide a greater weight capacity than a single axle. Semi-trailers usually have a tandem axle at the rear. Axles are typically made from SAE grade 41xx steel or SAE grade 10xx steel.
Most of the traits of the RR configuration are shared with the mid-engine rear-wheel-drive, or MR. Placing the engine near the driven rear wheels allows for a physically smaller, lighter, less complex, and more efficient drivetrain, since there is no need for a driveshaft , and the differential can be integrated with the transmission, commonly ...
More driven axles were needed, for better grip, but also a heavier load capacity which itself required an additional axle. This led to designs favouring the 6×4 layout with only the non-steering rear axles driven. 4×4 was largely ignored at first, at least from the major truck makers. [ 3 ]
A United States Navy Oshkosh MTVR, a six-wheel drive military truck with full-time all-wheel drive and super-single tires on all axles. Six-wheel drive (6WD or 6×6) is an all-wheel drive drivetrain configuration of three axles with at least two wheels on each axle capable of being driven simultaneously by the vehicle's engine.
This is an example of a "dead axle". A "live axle" not only connects two wheels, but also drives them. A beam axle, rigid axle, or solid axle is a dependent suspension design in which a set of wheels is connected laterally by a single beam or shaft. Beam axles were once commonly used at the rear wheels of a vehicle, but historically, they have ...
For road vehicles with more than two axles (e.g. some trucks), the wheelbase is the distance between the steering (front) axle and the centerpoint of the driving axle group. In the case of a tri-axle truck, the wheelbase would be the distance between the steering axle and a point midway between the two rear axles. [1]
Most eight-wheel drive trucks have two front and two rear axles, with only the front pair steering. Occasionally a single front and three rear (tridem) axles are seen, an example being the Oshkosh M1070 tank transporter. In such configurations, the frontmost and rearmost axle usually steer. [3] Other wheel groupings include that of the ZIL-135.
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