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MacPherson strut suspension, track control arm coloured dark blue. In automotive suspension, a control arm, also known as an A-arm, is a hinged suspension link between the chassis and the suspension upright or hub that carries the wheel. In simple terms, it governs a wheel's vertical travel, allowing it to move up or down when driving over ...
As such, push-rod suspension systems allow for much greater high-speed stability, much lower levels of body-roll, and a much lower centre of gravity for the vehicle. [7] For pull-rod suspension systems, the only difference is the orientation of the rocker arms. In a push-rod system, the rocker arms are placed at the highest point in the assembly.
Although each tyre still moves in an arc as in a standard swing-axle suspension, the lower control arms effectively are lengthened by attaching the axle pivot point to the bottom of the opposite frame rail (i.e., the left lower control arm pivots on the right frame rail and vice versa).
A single wishbone or A-arm can also be used in various other suspension types, such as variations of the MacPherson strut. The upper arm is usually shorter to induce negative camber as the suspension jounces (rises), and often this arrangement is titled an "SLA" or "short, long arms" suspension. When the vehicle is in a turn, body roll results ...
The assembly can be further simplified, if needed, by substituting an anti-roll bar (torsion bar) for the radius arm. [14] For those reasons, it has become almost ubiquitous with low cost manufacturers. Furthermore, it offers an easy method to set suspension geometry. [15] Many modern versions replace the lower control arm with a wishbone.
This needs a pair of arms longitudinally separated. Front view: The arms have to control camber, particularly the way that the camber changes as the wheel moves up (into jounce, or bump) and down into rebound or droop. Side view: The arms have to transmit traction and braking loads, usually accomplished via a longitudinal link.
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