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Independent wheel suspension:
Independent wheel suspension means that each wheel has its own suspension. That is to say, each wheel has its own control arm and each wheel can spring in and out independently of the others. The control arms are attached to the subframe, also called a rear axle carrier. Vehicles with a rigid rear axle or a semi-independent rear axle therefore do not have control arms or a subframe at the rear. It is more expensive to produce because it contains more materials, but the two major advantages are: better road holding and better comfort. Newer cars are increasingly being equipped with independent wheel suspension.
In the image below, the rear axle of a car with independent (rear) wheel suspension is shown.
On the left and right sides, in reality the coil springs are mounted on the control arms, but they are not visible in the image now.
The control arms 8 and reaction control arms 4 and 5 move with the suspension when the wheel compresses or rebounds. Compression or rebound on the left side has no effect on the compression and rebound on the right side. The left side can, for example, be fully compressed, while the right side is still in the rest position. With a rigid or semi-independent rear axle, the left side and the right side are connected to each other. When the left wheel compresses, this also affects the spring travel of the right wheel, and vice versa.
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