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:
1. Frame
2. Front axle
3. Rear axle
4. Steering system
5. Suspension system
6. Engine
7. Brake system
4. Classification of chassis
According to its control
1. Conventional chassis
2. Semi forward chassis
3. Full forward chassis
According to fitting of engine:
1. Engine at front
2. Engine fitted in front but crosswise
3. Engine fitted at centre of chassis
4. Engine fitted at back
5. Cont.
According to number of wheels fitted in vehicle and the number of driving
wheel:
1. 4 * 2 drive chassis vehicle
2. 4 * 4 drive chassis vehicle
3. 6 * 2 drive chassis vehicle
4. 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 :
1. To support the chassis components and the body.
2. To withstand static and dynamic loads with undue deflection.
8. Types of frame
The frames are made of following steel sections:
1. Channel section: for long member, good in bending
2. Box section : for short member, good in bending and torsion
3. 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.
