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Flip to reveal answersName the seven gear systems in the guide.
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All 4 Flashcards — Gears
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Question
Name the seven gear systems in the guide.
Answer
Spur, bevel, rack and pinion, worm and wheel, ratchet and pawl, idler, and compound.
Question
How is a gear ratio calculated?
Answer
Teeth on the driven gear divided by teeth on the driver. A 10-tooth driver into a 40-tooth driven gear is 4:1 — a quarter the speed, about four times the torque.
Question
What does an idler gear change?
Answer
The direction of the output, so it turns the same way as the input, and it bridges a gap between shafts. It does not change the overall ratio.
Question
Why is a worm and wheel used in a hoist or a tuning peg?
Answer
It gives a very large reduction in one step and cannot be back-driven, so the load holds wherever it stops.
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Topic 3.3 hub
Mechanical systems
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