Automobile chassis and automobile body

1. To study automobile chassis and automobile body Prepared by : Rudrik Joshi

2. Chassis Chassis is a French term and was initially used to denote the frame or main structure of a vehicle. The term chassis is now extensively used to denote the complete vehicle except body for the heavy vehicle a separate body.

3. Components of chassis Chassis contains following components: Frame Front axle Rear axle Steering system Suspension system Engine Brake system

4. Classification of chassis According to its control Conventional chassis Semi forward chassis Full forward chassis According to fitting of engine: Engine at front Engine fitted in front but crosswise Engine fitted at centre of chassis Engine fitted at back

5. Cont. According to number of wheels fitted in vehicle and the number of driving wheel: 4 * 2 drive chassis vehicle 4 * 4 drive chassis vehicle 6 * 2 drive chassis vehicle 6 * 4 drive chassis vehicle

6. Frame The frame is the main part of chassis on which the remaining parts of the chassis are mounted. It is a rigid structure that forms a skelton to hold all the major parts together. The engine is mounted on forward end of frame.

7. Function of frame The main function of frame are : To support the chassis components and the body. To withstand static and dynamic loads with undue deflection.

8. Types of frame The frames are made of following steel sections: Channel section: for long member, good in bending Box section : for short member, good in bending and torsion Tubular section : good in torsion

9. Cont. 1. Conventional frame: It is also known as non load carrying frame. Here the load on vehicles are transferred to the suspension by frame. The body is made of wood. Not much suited to resist torsion. 2. Semi integral frame: Rubber body mounts are replaced by relatively stiff mounts so that a part of frame load is transferred to body structure. This frame is heavy.

10. Cont. 3. Integral frame: In this type there is no frame and all assembly are attached to the body. In this, the chassis becomes a sub frame and other sub frames are used for the front and rear suspnsion units.

11. Body Body is the super structure of vehicle. The chassis and body makes the complete vehicle. In larger vehicles, the chassis and body are each made as a separate unit and then bolted together. The body is usually made from a large number of steel pressing which are welded together.

12. Types of body

13. Thank you