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Gear train
09
18
17
• Touseef
Haidar
• Arham
saleem
• Muhammad
Asghar
Gear
Gear trains
Types of gear
train
Gears are basically power transmation
machine equipment . you can transmit power
from one element of the machine to the
other element of the machine by using the
gears
Two or more gears are made to mesh with
each other to transmit the power from one
shaft to another shaft .such as the
combination is called Gear train /toothed
wheels.
The nature of the train used depend opon
the velocity ratio required and relative
position of the axes of the shaft.
A gear train may be consist of spur bevel and
spiral gear.
The different types of gear train depending
upon the arrangment on the wheel.
there are four types of gear train.
Simple gear train
compound gear trai
Reverted gear train
Epicylic gear train
In the first three types of the gear train. The
axes of the shafts over which the gears are
mounted are fixed relative to the each other.
But in the case of the epicyclic gear train
the axes of the shafts on which the gear are
mounted may move relative to a fixed axis .
There is only one gear on each shaft.it is
called the simple gear train.
when the distance between the two shafts is
small the two gears1 and 2 are made to mesh
with each other to transmit motion from one
shaft to the other.since the gear 1 drives the
gear 2.therefore gear 1 is call driver.
the gear two is called driven /follower.
It may be noted that the motion of the
driven gear is opposite to the motion of
driving gear.
v
A
B
GEAR 'A' GEAR 'B'
(Idler gear)
The only function of the idler gear is to change the
direction of rotation. It has no affect on the gear
ratio. The teeth on the gears must all be the same
size
use
1) to connect gears where a large centre distance
is required
2) To obtain the desired direction of Motion of the
driven gears (clockwise or anti clockwise)
Speed ratio
the speed ratio of the gear train is the ratio of
speed of the driver to the speed of the driven
and ratio of speed any pair of the gears in mesh
is the inverse of their number of the teeth.
Train value
it may be noted that ratio of the speed of the
driver or follower to the speed of the speed of
the driver is known as train value of the gear
train
Gear train
when there are more than one gear on a
shaft.it is called compound gear .
these gears are useful in bridging over the
space between the driver and driven.
GEAR 'A'
GEAR 'B'
GEAR 'C'
GEAR 'D'
Compound Gears
A
C
B
D
Output
Input
Compound gears are simply a chain of simple gear trains
with the input of the second being the output of the first. A
chain of two pairs is shown below. Gear B is the output of
the first pair and gear C is the input of the second pair.
Gears B and C are locked to the same shaft and revolve at
the same speed.
In the compound gear train.the gear A is the driving
gear mounted on shaft A,gear 1, gear 2and 3 are
compound gear which are mounted on shaft on shaft
B.the gears 4 and 5 are also compound gear which
are mounted on shaft C and the gear 6 is the driver
gear mounted on shaft D.
Gear train
Gear train
Have a nice day !!!
Good bye !!!

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Gear train

  • 4. Gears are basically power transmation machine equipment . you can transmit power from one element of the machine to the other element of the machine by using the gears
  • 5. Two or more gears are made to mesh with each other to transmit the power from one shaft to another shaft .such as the combination is called Gear train /toothed wheels.
  • 6. The nature of the train used depend opon the velocity ratio required and relative position of the axes of the shaft. A gear train may be consist of spur bevel and spiral gear.
  • 7. The different types of gear train depending upon the arrangment on the wheel. there are four types of gear train. Simple gear train compound gear trai Reverted gear train Epicylic gear train
  • 8. In the first three types of the gear train. The axes of the shafts over which the gears are mounted are fixed relative to the each other. But in the case of the epicyclic gear train the axes of the shafts on which the gear are mounted may move relative to a fixed axis .
  • 9. There is only one gear on each shaft.it is called the simple gear train. when the distance between the two shafts is small the two gears1 and 2 are made to mesh with each other to transmit motion from one shaft to the other.since the gear 1 drives the gear 2.therefore gear 1 is call driver. the gear two is called driven /follower. It may be noted that the motion of the driven gear is opposite to the motion of driving gear.
  • 10. v A B GEAR 'A' GEAR 'B' (Idler gear)
  • 11. The only function of the idler gear is to change the direction of rotation. It has no affect on the gear ratio. The teeth on the gears must all be the same size use 1) to connect gears where a large centre distance is required 2) To obtain the desired direction of Motion of the driven gears (clockwise or anti clockwise)
  • 12. Speed ratio the speed ratio of the gear train is the ratio of speed of the driver to the speed of the driven and ratio of speed any pair of the gears in mesh is the inverse of their number of the teeth. Train value it may be noted that ratio of the speed of the driver or follower to the speed of the speed of the driver is known as train value of the gear train
  • 14. when there are more than one gear on a shaft.it is called compound gear . these gears are useful in bridging over the space between the driver and driven.
  • 15. GEAR 'A' GEAR 'B' GEAR 'C' GEAR 'D' Compound Gears A C B D Output Input Compound gears are simply a chain of simple gear trains with the input of the second being the output of the first. A chain of two pairs is shown below. Gear B is the output of the first pair and gear C is the input of the second pair. Gears B and C are locked to the same shaft and revolve at the same speed.
  • 16. In the compound gear train.the gear A is the driving gear mounted on shaft A,gear 1, gear 2and 3 are compound gear which are mounted on shaft on shaft B.the gears 4 and 5 are also compound gear which are mounted on shaft C and the gear 6 is the driver gear mounted on shaft D.
  • 19. Have a nice day !!!