Chassis

Question 1

A chassis has to withstand what types of loads ?

Answer 1

Static and dynamic

Question 2

What are the negative effects of a rectangular frame?

Answer 2

Sagging- bending action causing frame to bend

Road shocks- shocks caused by vehicle motion or impacts

Question 3

What is lozenging?

Answer 3

Rectangular frames is pushed into a parallelogram shape

Question 4

What is twisting?

Answer 4

One corner of the frame is deflected

Question 5

What does the flat frame offer?

Answer 5

Little resistance to bending and twisting

Question 6

What does the channel frame offer?

Answer 6

Excellent resistance to bending

Resistance increases as depth of section increases

Question 7

What does tubular frame offer?

Answer 7

Excellent resistance to torsion

Resistance increases as diameter is increased

Question 8

What does a box frame offer?

Answer 8

Good resistance to both bending and torsion

Question 9

What are the Advantages and disadvantages of the light truck frame?

Answer 9

Great strength

Very poor resistance to torsion

Question 10

What does a box frame section need to be?

Answer 10

Extremely Rigid at mourning points for body and main components

Question 11

What do you use in areas of high stress?

Answer 11

Gusset plates

Question 12

What are the 5 types of frames ?

Answer 12

Light truck frame 
Box section frame 
Backbone frame 
Energy absorbing frame 
Frameless frame

Question 13

What benefits do frameless frames offer (monocoque)

Answer 13

Gives a stiff, light construction , suitable for mass construction

Question 14

What are body shells made by?

Answer 14

Spot welding the panels or building a space frame

Question 15

What is a space frame?

Answer 15

Skelton of high structural strength on which is mounted the body panels

Question 16

What is the purpose of a front sub frame?

Answer 16

Supports engine, transmission and suspension components

Question 17

What is the purpose of a rear sub frame?

Answer 17

Supports the suspension

Question 18

How is it mounted and what does it reduce?

Answer 18

Can be rubber mounted and reduces noise and vibration

Question 19

What is a disadvantage of sub frames? I

Answer 19

Difficult to repair

Question 20

When do we carry out chassis checks?

Answer 20

Routine maintenance

After a vehicle accident

In accordance with the maintenance schedule

Question 21

What do we check for on the chassis?

Answer 21

Fractured, cracked or deformed members
Cracked welds
Advanced corrosion
Severe corrosion

Question 22

What are insecure flitch plates ?

Answer 22

Used to reinforce chassis and give resistance to bending