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A Gear Train is a combination of gears used to transmit motion from one shaft to another. It is required to obtain large speed reduction within a small space.
TYPE OF GEAR TRAIN
(i) Simple gear train: In this each shaft support one gear.
(ii) Compound gear train: In this each shaft support two gear wheels except first and last.
(iii) Reverted gear train: In this driving and the driven gear coaxial or coincident.
(iv) Planetary and epicyclic gear train
It is also possible that in a gear train, the axes of some of the wheels are not fixed but rotate around the axes of other wheels with which they mesh. Such trains are known as planetary or epicyclic gear trains. Epicyclic gear trains are useful to transmit very high velocity ratios with gear of smaller sizes in a lesser space.
SIMPLE GEAR TRAIN
Train value =
Speed Ratio =
COMPOUND GEAR TRAIN
EPICYCLIC GEAR TRAIN