9.1 A vehicle is fitted with an automatic gearbox - NSC Mechanical Technology Automotive - Question 9 - 2023 - Paper 1
Question 9
9.1 A vehicle is fitted with an automatic gearbox. Explain how the following problems are solved:
9.1.1 The vehicle needs to be towed over a long distance
9.1.2 Sli... show full transcript
Worked Solution & Example Answer:9.1 A vehicle is fitted with an automatic gearbox - NSC Mechanical Technology Automotive - Question 9 - 2023 - Paper 1
Step 1
The vehicle needs to be towed over a long distance
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Answer
To tow a vehicle with an automatic gearbox over a long distance, the drive shaft must be disconnected. This can be accomplished by either removing the propeller shaft or using a flatbed tow truck. If utilizing a mobile jack, ensure the drive wheels are lifted off the ground.
Step 2
Slippage occurs inside a torque converter
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If slippage occurs within the torque converter, it is essential to identify the cause. The torque converter may need to be repaired or replaced, and topping up the transmission fluid may also be necessary to ensure proper function.
Step 3
The automatic gearbox oil overheats
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Overheating of the automatic gearbox oil can occur due to various reasons. The first step is to use an oil cooler to regulate the temperature. Regular topping up of the oil levels can also help prevent overheating.
Step 4
Gearshift lever position is selected before starting the vehicle
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Before starting the vehicle, it's crucial to ensure that the gearshift lever is positioned in either the 'Park (P)' or 'Neutral (N)' settings. This prevents potential damage to the transmission and ensures safe starting.
Step 5
Identify the correct type of oil to use in the gearbox
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The appropriate type of oil to use in the gearbox is automatic transmission fluid (ATF), which is specifically designed for the lubrication and operation of automatic transmissions.
Step 6
The driving member that is driven by the crankshaft
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The driving member that is driven by the crankshaft in a torque converter is known as the pump.
Step 7
It is splined to the gearbox input shaft
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The component splined to the gearbox input shaft is called the turbine.
Step 8
It increases the torque under load
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The part that increases the torque under load is referred to as the stator.
Step 9
Which component of the valve body is directly connected to the gear lever in an automatic transmission?
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The component of the valve body that is directly connected to the gear lever in an automatic transmission is called the manual valve.
Step 10
State TWO advantages of the epicyclic gear system in the transmission of a motor vehicle.
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Two advantages of the epicyclic gear system include:
It provides a variation in torque, allowing for smoother acceleration.
The design is compact, which saves space and adds efficiency to the overall vehicle design.
Step 11
Identify the gear system in FIGURE 9.5 above.
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The gear system in FIGURE 9.5 is identified as a double epicyclic gear system.
Step 12
Explain, in the CORRECT sequence, how reverse gear is obtained in this gear system.
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To obtain reverse gear in the system shown in FIGURE 9.5, the brake band locks the annulus 1. The input shaft, which is connected to the engine, drives the sun gears. As the planet gear rotates around the sun gears, it causes the output shaft to turn in reverse direction, engaging the reverse gear.
Step 13
Which component circulates the oil through an automatic gearbox?
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The component responsible for circulating oil through an automatic gearbox is the oil pump.
