Discussion
Identify the gear system shown in the figure below.
Answer: A
The figure shows worm gears: a worm, which is a screw-like shaft with helical threads, drives a toothed wheel (the worm wheel) set at right angles to it, with the axes not intersecting. This gives a large speed reduction in one stage. Herringbone gears are double helical gears with teeth in a V shape on parallel shafts. Helical gears have angled teeth but run on parallel shafts, and spur gears have straight teeth parallel to the axis. None of these has the screw-shaped shaft shown here.
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