Upright (automobile)
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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 Suspension or suspended may refer to: Science and engineering * Car suspension * Cell suspension or suspension culture, in biology * Guarded suspension, a software design pattern in concurrent programming suspending a method call and the calling ...
system that carries the hub for the wheel and attaches to the upper and lower
control arm 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 mo ...
s. Spindles are carried by
steering knuckle 300px, Double Wishbone Suspension In automotive suspension, a steering knuckle or upright is that part which contains the wheel hub or spindle, and attaches to the suspension and steering components. The terms ''spindle'' and ''hub'' are someti ...
s 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 Turning radius was a longstanding problem with wagons, dictated by the distance between the front wagon wheels and the bed of the wagon—namely, the point where the rotating wheels collide with the side of the wagon when turning. Many earlier de ...
*
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 A pintle is a pin or bolt, usually inserted into a gudgeon, which is used as part of a pivot or hinge. Other applications include pintle and lunette ring for towing, and pintle pins securing casters in furniture. Use Pintle/gudgeon sets have ...
*
Stub axle A stub axle or stud axle is either one of two front axles in a rear-wheel drive vehicle, or one of the two rear axles in a front-wheel drive vehicle. In a rear-wheel drive vehicle this axle is capable of angular movement about the kingpin for steer ...


References


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