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Flip to reveal answersName the components of a belt drive.
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All 4 Flashcards — Pulleys and belts
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Question
Name the components of a belt drive.
Answer
A driver pulley on the input shaft, a driven pulley on the output shaft, a belt running in the grooves of both, and a tensioner or adjustable mounting.
Question
How is a pulley ratio calculated?
Answer
Driven diameter divided by driver diameter. A 40 mm driver turning a 120 mm driven pulley is 3:1 — a third of the speed, about three times the torque.
Question
Give four reasons to choose a belt over gears.
Answer
It spans a gap with two parts, runs quietly with no lubrication, tolerates shafts slightly out of line, and slips under overload instead of shearing a tooth or stalling a motor.
Question
When must a plain belt not be used?
Answer
Where two shafts must stay synchronised, because a belt slips and stretches. An engine camshaft, a sewing machine or a printer needs gears or a toothed timing belt.
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Topic 3.3 hub
Mechanical systems
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