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Study the cross-sectional view of a double epicyclic gear system in FIGURE 9.1 below - NSC Mechanical Technology Automotive - Question 9 - 2022 - Paper 1
Question 9
Study the cross-sectional view of a double epicyclic gear system in FIGURE 9.1 below. Answer the questions that follow. **FIGURE 9.1** 9.1.1 Label parts A–F. 9.1.... show full transcript
Worked Solution & Example Answer:Study the cross-sectional view of a double epicyclic gear system in FIGURE 9.1 below - NSC Mechanical Technology Automotive - Question 9 - 2022 - Paper 1
Step 1
Step 2
Describe, in detail, the operation of the gear system in FIGURE 9.1 when low gear ratio/gear reduction is obtained
Answer
In a double epicyclic gear system, the operation relies on the interaction between the sun gears, planetary gears, and the ring gear. When low gear ratio is desired, the following occurs:
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Input Drive: The input shaft (part A) is engaged, driving the sun gears (part E).
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Planetary Gear Action: As the sun gears rotate, the planetary gears (part F) walk around the stationary annulus (part C), which is held stationary by the brake band (part B).
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Output Motion: The planetary carrier (part D) facilitates the rotation of the output main shaft. Due to the arrangement, the output shaft rotates more slowly compared to the input shaft, achieving the desired low gear ratio.
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Gear Reduction: The gear reduction occurs as the speed of the input decreases while the torque is effectively increased, maximizing the system's efficiency for heavy-duty applications.