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The unsprung mass (colloquially unsprung weight) of a vehicle is the mass of the suspension, wheels or tracks (as applicable), and other components directly connected to them. This contrasts with the sprung mass (or weight) supported by the suspension, which includes the body and other components within or attached to it.
Sprung and unsprung mass are shown Sprung mass (or sprung weight ), in a vehicle with a suspension , such as an automobile , motorcycle , or a tank , is the portion of the vehicle's total mass that is supported by the suspension, including in most applications approximately half of the weight of the suspension itself.
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One advantage for a comfortable ride was the reduction in unsprung weight, as the kingpins and steering gear were inboard of the suspension, and not thus counted as sprung mass. This in turn led to 'synchronous' behaviour in many cars with this suspension, where the natural frequency of the front wheel suspension, unusually for the time ...
The mass of the beam is part of the unsprung weight of the vehicle, hurting ride quality. The need for lateral location devices such as a Panhard rod or Watt's linkage adds more unsprung weight and partially offsets the beam axle's advantages in terms of simplicity, space efficiency, and cost.
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Accelerometer Based Systems: These use an accelerometer to measure the relative motion of the sprung mass, corrected (sometimes) for the unsprung mass. Examples of these are the early ARAN systems (Canada) and the ARRB Roughometer (Australia).
An inboard brake is an automobile technology wherein the disc brakes are mounted on the chassis of the vehicle, rather than directly on the wheel hubs. Its main advantages are twofold: a reduction in the unsprung weight of the wheel hubs, as this no longer includes the brake discs and calipers; and braking torque is applied directly to the chassis, rather than being transferred to it through ...