Question 2
Fig. 4: A unit of automobile Transmission System
Use the sketch in fig. 4 to answer the questions in 12 (a)
- (i) What is the name of the unit?
(ii) State two functions of the unit in the system.
(iii) Name the part labelled N.
(iv) Name the component of the transmission system which is
mounted to the part labelled N.
(b) State three causes of oil leakage in rear axle.
Observation
In this section of the paper, the candidates’ performance was very satisfactory. However, questions 12, 14 and 15 (a), though very lucid and straight-forward as well, were not adequately answered by many candidates. Their solutions are accordingly given below.
Solution
(a) (i) The Name of the Unit
Life Rear axle/Final drive unit
(ii) Functions of the Unit in Automobile Transmission System
It accommodates half-shaft.
It transmits drive to the road wheels.
It provides differential to the road wheels.
It provides casing for lubricating oil.
It accommodates the final drive gears.
It accommodates the braking system.
It accommodates the suspension system.
It carries the rear weight of the vehicle.
It accommodates the road wheels.
(iii) N: Driver coupling (Companion flange)
(iv) The Part to Which N is Mounted
Propeller shaft
(b) Causes of Oil Leakage in Rear Axle
Worn or broken seal
Cracked housing
Damaged gasket
Loose bolts