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Gear Train

This document defines and describes different types of gear trains: 1) A gear train transmits power from one shaft to another using two or more meshing gears. There are four main types: simple, compound, reverted, and epicyclic. 2) A simple gear train has only one gear on each shaft. A compound gear train has more than one gear on a shaft to bridge space between driver and driven gears. 3) A reverted gear train has coaxial first and last gears, causing the first gear to drive the last in the same direction. An epicyclic gear train allows the gear axes to move relative to a fixed axis, like in a planet gear system.

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अman अmit
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766 views7 pages

Gear Train

This document defines and describes different types of gear trains: 1) A gear train transmits power from one shaft to another using two or more meshing gears. There are four main types: simple, compound, reverted, and epicyclic. 2) A simple gear train has only one gear on each shaft. A compound gear train has more than one gear on a shaft to bridge space between driver and driven gears. 3) A reverted gear train has coaxial first and last gears, causing the first gear to drive the last in the same direction. An epicyclic gear train allows the gear axes to move relative to a fixed axis, like in a planet gear system.

Uploaded by

अman अmit
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Gear Train

Gear Train
 Definition:
When 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’.

 Types of gear trains:


1. Simple gear train,
2. Compound gear train,
3. Reverted gear train, and
4. Epicyclic gear train.
Simple gear train
 Definition:
When there is only one gear
on each shaft as shown in
fig., it is known as simple
gear train.

When the distance between


two shafts is small, the two
gears 1 and 2 are made to
mesh with each other to
transmit motion from one
shaft to other as shown in fig.
Since the gear 1 drives 2,
therefore gear 1 is called the
driver and the gear 2 is called
Compound gear train
 Definition:
When there are more than one gear
a shaft as shown in fig., it is known
as compound gear train.

Compound gear trains are useful


in bridging over the space between
the driver and the driven.
Reverted gear train
 Definition:
When the axes of the first gear
and the last gear are co-axial, then
the gear train is known as
reverted gear train as shown in
figure.

Here the gear 1 drives the gear 2 in


the opposite direction.
S i n c e t h e g e a r 2 a n d 3 f o r m a
compound gear and the gear 3 will
rotate in the same direction as of
gear 2.
the gear 3 will drive the gear 4 in the
same direction as of gear 1.
hence the motion of the first gear
Epicyclic gear train
In an epicyclic gear train, the axes
of the shafts, over which the gears
are mounted, may move relative to
a fixed axis.
A simple epicyclic gear train is
shown in figure.
When a gear 1 and arm 3 and gear
2 and arm 3 have a common axis.
If the arm is fixed, the gear train is
simple and gear 1 can drive gear 2
or vice-versa, but is gear 1 is fixed
and the arm is rotated about the
axis then the gear 2 is forced to
rotate upon and around the gear 1.
Such a motion is called epicyclic.
 Compound Epicyclic gear train-sun and
planet gear

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