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1. Gear trains
UPENDRA KUMAR MALLA

2. WHAT IS gear train
Sometimes, two or more gears are made to mesh with each
other to transmit power from one shaft to another. Such a
combination is called gear train or train of toothed wheels.

3. Types of gear train
Following are the different types of gear trains, depending
upon the arrangement of wheels :
1. Simple gear train,
 2. Compound gear train,
 3. Reverted gear train, and
4. Epicyclic gear train

4. Types of gear train –
Simple Gear Train
 When there is only one gear on each shaft is
known as simple gear train.
 When the distance between the two shafts is
small, the two gears 1 and 2 are made to mesh
with each other to transmit motion from one shaft
to the other.

5. Types of gear train –
Simple Gear Train

6. Types of gear train –
compound Gear Train
 When there are more than one gear on a shaft it
is called a compound train of gear.

7. Types of gear train –
compound Gear Train
 The advantage of a compound train over a simple gear train is that a much
larger speed reduction from the first shaft to the last shaft can be obtained
with small gears. If a simple gear train is used to give a large speed
reduction, the last gear has to be very large.
 Usually for a speed reduction in excess of 7 to 1, a simple train is not used
and a compound train or worm gearing is employed.

8. Types of gear train –
reverted Gear Train
 When the axes of the first gear
(i.e. first driver) and the last gear
(i.e. last driven or follower) are co-
axial, then the gear train is known
as reverted gear train.
 The reverted gear trains are used
in automotive transmissions, lathe
back gears, industrial speed
reducers, and in clocks (where the
minute and hour hand shafts are
co-axial).

9. Types of gear train –
reverted Gear Train

10. Types of gear train –
epicyclic Gear Train
 We have already discussed that in an epicyclic gear train,
the axes of the shafts, over which the gears are mounted,
may move relative to a fixed axis.
The epicyclic gear trains are
useful for transmitting high
velocity ratios with gears of
moderate size in a
comparatively lesser space.
 The epicyclic gear trains are
used in the back gear of
lathe, differential gears of the
automobiles, hoists, pulley
blocks, wrist watches etc.

11. Types of gear train –
epicyclic Gear Train

12. Thanks for watching
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