Epicyclic
Gear train :-
In case of Epicyclic
Gear train, the axis of shafts on which gears are mounted may have a
relative motion between them, unlike other gear trains.
This gives advantage that,
very high or low velocity ratio can be obtained compared to simple and compound
gear trains; in the small space.
In above sketch, if gears
A and B are rotating and arm RS is fixed, then it behaves like simple gear
train.
However, when Arm C rotates and gear A is
fixed, then train becomes epicyclic. It is also known as planetary gear train.
Diagram:-
Applications-
Differential gears of the
automobiles,
back gear of lathe,
hoists, pulley blocks
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