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Preload in such cases is important for several reasons. First, a tightened bolt experiences only a small fraction of any external load that will be applied later, so that a fully tightened bolt can (depending on the exact application) sustain a much greater load than a loosely tightened bolt.
Unsprung mass is a consideration in the design of a vehicle's suspension and the materials chosen for its components. Beam axle suspensions, in which wheels on opposite sides are connected as a rigid unit, generally have greater unsprung mass than independent suspension systems, in which the wheels are suspended and allowed to move separately.
In semi-independent suspensions, the wheels of an axle are able to move relative to one another, as in an independent suspension, but the position of one wheel has an effect on the position and attitude of the other wheel. This effect is achieved through the twisting or deflecting of suspension parts under load.
Pull-rod suspension and push-rod suspension refer to a specialised type of automotive suspension system which is largely based on a double-wishbone system, incorporating elements of the commonly used MacPherson strut. [1] In cars, suspension refers to the system by which the vehicle maintains contact between all of its wheels and the ground.
Preload is the pressure exerted on a spring over the distance it is compressed. A higher preload means a stiffer spring and a lower preload results in a softer spring with more travel. This is true if the coilover uses progressive springs. On coilovers with linear springs preload has no effect on spring rate.
The most famous American passenger car application of the torsion bar, was the Chrysler system used beginning with all Chrysler products starting with the 1957 model year in cars such as the Imperial Crown series, Chrysler Windsor, DeSoto Firedome, Dodge Coronet and Plymouth Belevedere although Chrysler's "Torsion-Air" suspension was only for ...