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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 bumps, into potholes, or otherwise reacting to the irregularities of a ...
The Klann linkage is a planar mechanism designed to simulate the gait of legged animal and function as a wheel replacement, a leg mechanism. The linkage consists of the frame, a crank , two grounded rockers , and two couplers all connected by pivot joints .
The lowered pivot point and longer arm length reduce the change in camber and the effect is far less hazardous than powered swing axles for the rear wheels listed above, where the pivot point is approximately on the same side frame rail. [6] The Twin I-Beam suspension includes an additional radius arm link on each side to control caster. [7]
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. They also have to control caster. Note that brake torques also have to be ...
Because the wheels are not constrained to remain perpendicular to a flat road surface in turning, braking, and varying load conditions, control of the wheel camber is an important issue. Swinging-arm was common in small cars that were sprung softly, and could carry large loads, because the camber is independent of load.
The wheel and tire assembly attach to the hub or spindle of the knuckle where the tire/wheel rotates while being held in a stable plane of motion by the knuckle/suspension assembly. 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.
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The rear wheels are located transversely by top links and wheel carriers (green) and lower links (cyan). The top link is the driving half-shaft with a universal joint at each end. The lower link pivots adjacent to the differential casing at its inboard end and where it meets the wheel carrier at the wheel hub casting (violet) at its outboard end.