In a car, the spindle is a part of the suspension system that carries the hub for the wheel and attaches to the upper and lower control arms. The spindle is referred to as an upright in UK-built vehicles and in areas dominated by cars designed for the UK, like Australia, New Zealand etc.
There are several considerations when designing a spindle. Loads and forces need to be considered. Vertical and horizontal forces greater than those due to 5 times the acceleration of gravity, that is, about 50 meters per second, are sometimes considered desirable.
A broken or bent spindle changes a vehicle’s suspension system alignment angles. Any damage due to impact or part failure makes driving unsafe, and the spindle needs to be repaired immediately. Repairing a spindle is a physically-demanding project because of the weight of the parts involved.
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