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Control Arm Explained

Posted on 3/15/2016 10:16:47 AM

The control arm,known as an A-arm and located in automotive suspension,is a hinged suspension link between the chassis and the suspension upright or hub that carries the wheel.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 and forth; this motion is constrained by a separate link or radius rod.This is in contrast to the wishbone. Wishbones are triangular and have two widely spaced inboard bearings. These constrain the outboard end of the wishbone from moving back and forth, controlling two degrees of freedom, and without requiring additional links.Most control arms form the lower link of a suspension. A few designs use them as the upper link, usually with a lower wishbone. The additional radius rod is then attached to the upper arm.

Right now there are some popular control arms which is applicatiton to Mercede-Benz,Audi,BMW are on hot sale in the market.

Mercedes-Benz Lower Control Arms 2043308011

Mercedes-Benz Front-Lower Control Arms 2213307707

Mercedes-Benz Control Arms 2213307807


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