COLLAPSIBLE STEERING COLUMN क्या होता है? || COLLAPSIBLE स्टीयरिंग कॉलम क्या होता है?

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Collapsible Steering Column
 A collapsible steering column is a necessity in automotive vehicles because if no such
a mechanism exists at the time of crash or compression at the front of the vehicle the steering
may go through or into someone causing serious damage.
 Collapsible steering columns consist of mechanisms on the long shaft that connects the
steering wheel to the steering gearbox.
Mechanism 1: Plastic Shear Pins (Ball Jacket Type)
 The collapsible design is composed of an inner and an outer sleeve, pressed tightly together
with a number of steel bearings in between.
 These steel bearings are pressed into the metal sleeves and are held in place with strong
Plastic Shear Pins which is designed to shatter when a specific level of pressure is applied.  In the event of a frontal impact, the steel bearings between the sleeves break free from the
pins, allowing the inner sleeve to be moved further into the outer sleeve in telescopic
fashion before enough pressure is achieved to ram the whole steering column into the
driver.
 Mechanism 2: Mesh Type
 The steel bearings can be replaced with a ‘mesh’ design that folds in a concertina fashion
when an impact is received

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