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The inboard (chassis) end of a control arm is attached by a single pivot, usually a rubber bushing. It can thus control the position of the outboard end in only a single degree of freedom, maintaining the radial distance from the inboard mount. Although not deliberately free to move, the single bushing does not control the arm from moving back ...
The twist-beam provided a cost saving of €100 per car compared to multi-link rear suspension, [4] although the version used in the 2009–2018 Opel Astra also employed a Watts linkage at a cost of €20 to address the drawbacks and provide a competitive and cost-effective rear suspension.
The leading arm / trailing arm swinging arm, fore-aft linked suspension system, together with in-board front brakes, had a much smaller unsprung weight than existing coil spring or leaf designs. The interconnection transmitted some of the force deflecting a front wheel up over a bump, to push the rear wheel down on the same side.
For this reason, push-rod suspension rarely sees usage in production cars due to its many drawbacks and compromises. One major drawback of push-rod suspension is the cost. In production model vehicles, it is most important for the company to remain profitable, and as such, the most cost effective designs are most commonly used.
The shock absorber and coil spring mount to the wishbones to control vertical movement. Double wishbone designs allow the engineer to carefully control the motion of the wheel throughout suspension travel, controlling such parameters as camber angle , caster angle , toe pattern, roll center height, scrub radius , scuff ( mechanical abrasion ...
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 ...