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Car Steering Column

The automotive steering column is a device intended primarily for connecting the steering wheel to the steering mechanism.

A steering column may also perform the following secondary functions:

energy dissipation management in the event of a frontal collision;

provide mounting for: the multi-function switch, column lock, column wiring, column shroud(s), transmission gear selector, gauges or other instruments as well as the electro motor and gear units found in EPAS and SbW systems;

offer (height and/or length) adjustment to suit driver preference

Steering lock

Modern vehicles are fitted with a steering lock which is an anti-theft device. It is fitted to the steering column usually below the steering wheel. The lock is combined with the ignition switch and engaged and disengaged either by a mechanical ignition key or electronically from the vehicle's electronic control unit. These locks were introduced on many General Motor products in 1969 drastically reducing thefts of these GM models,[1] and on Ford, Chrysler, and AMC products in 1970.

Collapsible column

A common device to enhance car safety is the collapsible steering column. This is designed to collapse in the event of a collision to protect the driver from harm. The column can collapse after impact with a tolerance ring inserted between the inner shaft of the steering column and the external housing. The wavelike protrusions on the circumference of the tolerance ring act as a spring to hold the two parts in place in normal driving conditions. At a specific level of force, for example in the event of a collision, the tolerance ring allows the inner shaft to slip inside the housing, so the column can collapse, absorbing energy from the impact.

In virtually all modern vehicles, the lower section of the inner shaft is articulated with universal joints which helps control movement of the column in a frontal impact, and also gives engineers freedom in mounting the steering gear itself.

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