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In an
automobile A car, or an automobile, is a motor vehicle with wheels. Most definitions of cars state that they run primarily on roads, Car seat, seat one to eight people, have four wheels, and mainly transport private transport#Personal transport, peopl ...
, the wheel spindle, sometimes called simply the spindle, is the part of the suspension system that carries the hub for the wheel and attaches to the upper and lower control arms. Spindles are carried by steering knuckles or "uprights". Although the terms "steering knuckle" and "upright" are sometimes used interchangeably with "spindle", they all refer to different parts.


Design

There are several considerations when designing a spindle. Loads and forces need to be considered. Tolerance to vertical and horizontal forces greater than those due to 5 times the acceleration of gravity, approximately 50 meters per second squared, are sometimes considered desirable.


Non-driven wheel

The main forces on a non-driven wheel are braking and turning forces.


Driven wheel

The main forces on a driven wheel include forward and reverse propulsion in addition to braking and turning forces.


See also

* Front axle assembly *
List of auto parts This is a list of auto parts, which are manufactured components of automobiles. This list reflects both fossil-fueled cars (using internal combustion engine An internal combustion engine (ICE or IC engine) is a heat engine in which the c ...
* Pintle * Stub axle


References


List of Spindles/Uprights available in Australia suitable for Race, Modified and Individuality Constructed Vehicles
Automotive suspension technologies {{automotive-part-stub