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Most control arms form the lower link of a suspension. Control arms play a crucial role in the suspension system of a vehicle. They help to keep the wheels aligned and maintain proper tire contact with the road, which is essential for safety and stability. [1] The inboard (chassis) end of a control arm is attached by a single pivot, usually a ...
Twin I-Beam diagram; each lower control arm is attached to the opposite side of the vehicle (F)rame, so the arc described by the suspension travel of the (L)eft lower control arm, for example, results in less camber change than if the (L)eft lower control arm was attached to the left side of the (F)rame
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.
In the attached photograph of a double-wishbone suspension, the knuckle is shown attached to the upper control arm at the top and the lower control arm at the bottom. The wheel assembly is shown attached to the knuckle at its center point.
This was the case in the BMC Mini of 1959 and its many derivatives, where the lower control arm carried no vertical loading, so the joint needed an anti-rattle spring, while the top joint, comprising identical parts, was always in compression due to spring (rubber cone) and damper loads, and so was not fitted with a spring.
Diagram showing a lower tie bar. A lower tie bar is an alloy/steel bar that ties the lower suspension pick-up points of a vehicle (with an independent suspension [1]) together. It increases chassis rigidity by bracing the left and right lower-control-arm sheet metal mounting points.
Trailing-arm designs in live axle setups often use just two or three links and a Panhard rod to locate the wheel laterally. A trailing arm design can also be used in an independent suspension arrangement. Each wheel hub is located only by a large, roughly triangular arm that pivots at one point, ahead of the wheel. Seen from the side, this arm ...
A link differs from a control arm because it can only control one of the degrees of freedom by itself. In the attached photo of a 5-link live axle suspension, the different types of links can be seen. These links work in tandem with the coil springs, dampers, and sway bar to control all six degrees of freedom of the axle. The upper links ...