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VEHICLE AXLES Axles are an important structural component of a wheeled Vehicle . The axles maintain the position of the wheels relative to each other and to the vehicle body. Since for most vehicles the wheels are the only part touching the ground, the axles must bear the weight of the vehicle plus any Cargo , and also any acceleration forces between the vehicle and the ground. In addition to the structural purpose, axles may serve one or more of the following purposes depending on the design of the vehicle.
Structural features Wheel]] A straight axle is a single rigid shaft connecting a wheel on the left side of the vehicle to a wheel on the right side. The axis of rotation fixed by the axle is common to both wheels. Such a design can keep the wheel positions steady under heavy stress, and can therefore support heavy loads. Straight axles are used on Train s, for the rear axles of commercial Truck s, and on heavy duty Off-road vehicles. The axle can be protected and further reinforced by enclosing the length of the axle in a housing. In a split axle design, the wheel on each side is attached to a separate shaft. Modern passenger cars generally have split front and rear axles. This allows Independent Suspension of the left and right wheels, and therefore a smoother ride. It also permits the left and right wheels to rotate at different speeds as the automobile turns, improving traction and extending tire life. A tandem axle is a group of two or more axles situated close together. Trucks designs will use such a configuration to provide a greater weight capacity than a single axle. Semi Trailer s usually have a tandem axle at the rear. Drive axles See Also: Driving wheel An axle that is driven by the engine is called a drive axle. Modern Front Wheel Drive cars typically combine the Transmission and front axle into a single unit called a Transaxle . The drive axle is a split axle with a Differential and Universal Joint s between the two half axles. Each half axle connects to the wheel by use of a Constant Velocity (CV) Joint which allows the wheel assembly to move freely vertically as well as to pivot when making turns. In Rear Wheel Drive cars and trucks, the engine turns a driveshaft which transmits rotational force to a drive axle at the rear of the vehicle. The drive axle may be a Live Axle , but modern automobiles generally use a split axle with a differential. Some simple vehicle designs, such as Go-kart s, may have a single drive wheel. The drive axle is a split axle with only one of the two shafts driven by the engine. Dead axles/lazy axles A dead axle, also called '''lazy axle''', is not part of the drivetrain but is instead free-rotating. The rear axle of a front-wheel drive car may be considered a dead axle. Many trucks and trailers use dead axles for strictly load-bearing purposes. A dead axle located immediately in front of a drive axle is called a '''pusher axle'''. A '''tag axle''' is a dead axle situated behind a drive axle. Some Dump Truck s and trailers are configured with airlift axles, which may be mechanically raised or lowered. The axle is lowered to increase the weight capacity, or to distribute the weight of the cargo over more wheels, for example to cross a weight restricted Bridge . When not needed, the axle is lifted off the ground, to save wear on the tires and axle and increase traction in the remaining wheels. Lifting an axle also makes the vehicle tighten turns better. Several manufacturers offer computer-controlled airlift, so that the dead axles are automacally lowered when the main axle reaches its weight limit. The axles can still be lifted by the press of a button if needed. SEE ALSO
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