To study automobile chassis and

automobile bodyPrepared by : Rudrik Joshi

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.

Components of chassis

Chassis contains following components:1. Frame2. Front axle3. Rear axle4. Steering system5. Suspension system6. Engine7. Brake system

Classification of chassis

According to its control1. Conventional chassis2. Semi forward chassis3. Full forward chassis

According to fitting of engine:1. Engine at front2. Engine fitted in front but crosswise3. Engine fitted at centre of chassis4. Engine fitted at back

Cont.

According to number of wheels fitted in vehicle and the number of driving wheel:

1. 4 * 2 drive chassis vehicle2. 4 * 4 drive chassis vehicle3. 6 * 2 drive chassis vehicle4. 6 * 4 drive chassis vehicle

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.

Function of frame

The main function of frame are :1. To support the chassis components and the body.2. To withstand static and dynamic loads with undue deflection.

Types of frame

The frames are made of following steel sections:1. Channel section: for long member, good in bending2. Box section : for short member, good in bending and torsion3. Tubular section : good in torsion

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.

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.

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.

Types of body

Thank you