Chassis Flashcards
A chassis has to withstand what types of loads ?
Static and dynamic
What are the negative effects of a rectangular frame?
Sagging- bending action causing frame to bend
Road shocks- shocks caused by vehicle motion or impacts
What is lozenging?
Rectangular frames is pushed into a parallelogram shape
What is twisting?
One corner of the frame is deflected
What does the flat frame offer?
Little resistance to bending and twisting
What does the channel frame offer?
Excellent resistance to bending
Resistance increases as depth of section increases
What does tubular frame offer?
Excellent resistance to torsion
Resistance increases as diameter is increased
What does a box frame offer?
Good resistance to both bending and torsion
What are the Advantages and disadvantages of the light truck frame?
Great strength
Very poor resistance to torsion
What does a box frame section need to be?
Extremely Rigid at mourning points for body and main components
What do you use in areas of high stress?
Gusset plates
What are the 5 types of frames ?
Light truck frame Box section frame Backbone frame Energy absorbing frame Frameless frame
What benefits do frameless frames offer (monocoque)
Gives a stiff, light construction , suitable for mass construction
What are body shells made by?
Spot welding the panels or building a space frame
What is a space frame?
Skelton of high structural strength on which is mounted the body panels
What is the purpose of a front sub frame?
Supports engine, transmission and suspension components
What is the purpose of a rear sub frame?
Supports the suspension
How is it mounted and what does it reduce?
Can be rubber mounted and reduces noise and vibration
What is a disadvantage of sub frames? I
Difficult to repair
When do we carry out chassis checks?
Routine maintenance
After a vehicle accident
In accordance with the maintenance schedule
What do we check for on the chassis?
Fractured, cracked or deformed members
Cracked welds
Advanced corrosion
Severe corrosion
What are insecure flitch plates ?
Used to reinforce chassis and give resistance to bending