Chassis Frame | Frame Rails | Auto Chassis

Chassis is a French term and was initially used to denote the frame parts or Basic Structure of the vehicle. It is the back bone of the vehicle. A vehicle with out body is called Chassis. The components of the vehicle like Power plant, Transmission System, Axles, Wheels and Tyres, Suspension, Controlling Systems like Braking, Steering etc., and also electrical system parts are mounted on the Chassis frame. It is the main mounting for all the components including the body. So it is also called as Carrying Unit.

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The following main components of the Chassis are:

  • Frame: it is made up of long two members called side members riveted together with the help of number of cross members.
  • Engine or Power plant: It provides the source of power
  • Clutch: It connects and disconnects the power from the engine fly wheel to the transmission system.
  • Gear Box
  • U Joint
  • Propeller Shaft
  • Differential

FUNCTIONS OF THE CHASSIS FRAME:

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1. To carry load of the passengers or goods carried in the body.
2. To support the load of the body, engine, gear box etc.,
3. To withstand the forces caused due to the sudden braking or acceleration
4. To withstand the stresses caused due to the bad road condition.
5. To withstand centrifugal force while cornering

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VARIOUS LOADS ACTING ON THE FRAME:

1. Short duration Load – While crossing a broken patch.
2. Momentary duration Load – While taking a curve.
3. Impact Loads – Due to the collision of the vehicle.
4. Inertia Load – While applying brakes.
5. Static Loads – Loads due to chassis parts.
6. Over Loads – Beyond Design capacity.

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