6.1.4 Steering knuckle
The steering knuckle is the link between the suspension arms and the wheel. A schematic view of this part is shown in Figure 6.4. Generally, such part is called axle journal. However, in case if the axle journal is mounted on a steering wheel suspension, then it is called a steering knuckle. In case if the wheels are not steered, then the name "axle journal" remains.
The knuckle is steering, because it is turning. It also participates in the process of changing the direction of movement. It is to the steering knuckle that the steering linkage elements or steering rods are attached (these elements are described in detail in the "Steering" chapter). The steering knuckle is a massive part, because it absorbs all shocks and vibrations from the road.
The design of the steering knuckles depends on the type of vehicle drive. Thus, in case if the drive is combined (when the wheels are both steered and traction at the same time, which is typical for front-wheel drive cars), then the steering knuckle will have a through hole for the outer part of the drive shaft, as shown in Figure 6.4. In case if the wheels are only steerable, then the steering knuckle will have a support axle with a tapered section, as, for example, shown in Figure 6.7.
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