Illustrate one type of a constant velocity joint and explain its operation

1) a) State FOUR advantages of worm and worm wheel final drive over crown wheel and pinion type. (4 marks)
b) With the aid of a diagram, explain the operation of a two speed final drive unit used in some vehicles. (16 marks)
2) a) List any FOUR requirements of a brake servo unit fitted in a motor vehicle. (4 marks)
b) With the aid of a diagram, explain the operation of a vacuum brake servo unit. (16 marks)
3) a) With the aid of a graph, explain the effect of using single Hooke’s universal joint to transmit a drive through an angle. Suggest a solution to the problem. (10 marks)
b) Illustrate one type of a constant velocity joint and explain its operation. (10 marks)
4) a) State the meaning of the following as applied to steering:
i. Centre point steering
ii. Positive roll radius
iii. Negative roll radius (6 marks)
b) Illustrate Negative roll radius and explain its effect on stability of a vehicle. (14 marks)

 

 

 

 

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