FIGURE 9.1 below shows a torque converter used in automatic transmissions - NSC Mechanical Technology Automotive - Question 9 - 2021 - Paper 1
Question 9
FIGURE 9.1 below shows a torque converter used in automatic transmissions. Answer the questions that follow.
9.1.1 Label parts A–E in FIGURE 9.1 above.
9.1.2 State... show full transcript
Worked Solution & Example Answer:FIGURE 9.1 below shows a torque converter used in automatic transmissions - NSC Mechanical Technology Automotive - Question 9 - 2021 - Paper 1
Step 1
9.1.1 Label parts A–E in FIGURE 9.1 above.
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Answer
A. Turbine
B. Casing / housing
C. Pump / Impeller
D. Turbine shaft / output shaft
E. Stator
Step 2
9.1.2 State THREE functions of a torque converter.
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Answer
It multiplies engine torque automatically according to road and engine speeds.
It transfers drive from the engine to the transmission, acting like a flywheel to keep the engine running during idle strokes.
It dampens torsional vibrations of the engine, contributing to smoother operation and gear changing.
Step 3
9.1.3 When is maximum torque multiplication obtained in a torque converter?
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Maximum torque multiplication occurs when there is the largest speed difference between the impeller and turbine, typically at rest when the vehicle just starts to move.
Step 4
9.2 Explain how forward overdrive is obtained in an epicyclic gear train.
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Forward overdrive is achieved by locking the sun gear with the planet carrier as the driving member, while the annulus acts as the driven component. This setup allows for increased speed of the output shaft relative to the input shaft.
Step 5
9.3.1 What do the following gearshift lever positions on an automatic transmission refer to?
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Answer
P refers to Park.
Step 6
9.3.2 What do the following gearshift lever positions on an automatic transmission refer to?
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R refers to Reverse.
Step 7
9.3.3 What do the following gearshift lever positions on an automatic transmission refer to?
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D refers to Drive.
Step 8
9.4 In which TWO gearshift lever positions, P, R, N, D, 1 or 2, is it possible to start the engine fitted with an automatic transmission?
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The engine can be started in positions P (Park) and N (Neutral).
