9.1 FIGURE 9.1 below shows a lockup torque converter. Answer the questions that follow.
9.1.1 State TWO functions of the clutch friction surface A.
9.1.2 State TWO... show full transcript
Worked Solution & Example Answer:9.1 FIGURE 9.1 below shows a lockup torque converter - NSC Mechanical Technology Automotive - Question 9 - 2022 - Paper 1
Step 1
State TWO functions of the clutch friction surface A.
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Answer
The lock-up clutch improves efficiency by reducing energy losses.
It prevents slip, ensuring that power from the engine is efficiently transmitted to the transmission.
Step 2
State TWO functions of stator B.
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The stator redirects oil back to the impeller.
It increases the engine torque by allowing optimal fluid flow.
Step 3
Explain how the lockup clutch engages in the torque converter.
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The lockup clutch engages when oil pressure in the torque converter increases with engine speed. The pressurized oil is directed to the lock-up clutch piston, which pushes the friction plate against the clutch friction surface attached to the housing. Once engaged, the friction plate connects the impeller to the turbine, causing them to rotate as one unit.
Step 4
Identify the part of an automatic gearbox shown in FIGURE 9.2.
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The part shown is the double epicyclic gear train.
Step 5
How forward and reverse gear selections are obtained using the configuration in FIGURE 9.2?
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Forward gear selections are obtained through three forward ratios, while reverse gear is achieved by selecting the one reverse ratio available in the gearbox configuration.
Step 6
Describe TWO methods of cooling the hydraulic transmission fluid in an automatic transmission.
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The hydraulic transmission fluid is circulated through an oil cooler at the radiator.
The airflow over the transmission sump helps with cooling by allowing heat exchange.
Step 7
State TWO differences between the construction of a manual transmission and the construction of an automatic transmission.
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Answer
A manual transmission has a less complex design compared to an automatic transmission, which is more mechanically intricate.
A manual utilizes a clutch when changing gears, whereas an automatic transmission uses a torque converter.
