In this content, you can learn about introduction of gear train and types of gear train and rope drive and it's advantages.
GEAR TRAIN
For transmitting the power from one shaft to other shaft, sometime we require two or more gears or the combination of gear. The combination is called gear train or train of toothed wheels. It becomes more necessary, when we want to obtain large speed reduction in a small space.
Types of Gear Train
(1) Simple Gear Train
(2) Compound Gear Train
(3) Riverted Gear Train
(4) Epicyclic Gear Train
or Planetary Gear Train
Types of Gear Train in details:-
(1) Simple Gear Train:-
When there is only one gear on each shaft then the arrangement is known as simple gear train.
In this arrangement two external gears of a pair moves always in opposite directions and all odd numbered gears moves in same direction as well as even-numbered gears in the opposite directions.
As in above figure, gears 1, 3, 5 moves in counter clockwise direction where as 2 , 4 moves in clockwise direction.
(2) Compound Gear Train:-
When the gear train in which the intermediate shaft consist more than one gear. It is called a compound train of gear.
In this type, some of the intermediate shaft i.e., other than the input and output shaft, carry more than one gear as shown in figure.
(3) Riverted Gear Train:-
If the axis of the first and last wheels of a compound gear train are the same i.e., co-axial is called river tedgeartrain. It is used in clock and in simple lathes where back gear is used.
(4) Epicyclic Gear Train:-
Those gear train which having relative motion of axes is called an epicyclic gear train. In this epicyclic gear train at least one of the gear also moves relative to the frame. It is also known as Planetary Gear Train.
Consider two gears S and T , the axes of which is connected by an arm . The arm is fixed, the wheel S and T form a simple gear train. But if the wheel T is fixed so that the arm can rotate about the axis of T, the wheel S move ground T . Therefore, it is an epicyclic gear train. Usually S is known as epicyclic wheel.
Rope Drive
Where there a large amount of power is to be transmitted from one pulley to another within a considerable distance then the rope driver is used.
The use of flat belt is limited within a pulley distance of 8 meter apart. But if a large amount of power is to be transmitted then their needs a excessive increase in belt cross-section. It may be noted that friction grip in case of rope drive is more than that in V-drive.
The rope drive are classified into two types:-
(1) Fibre Rope
(2) Wire Rope
Rope drives are usually preferred for long centre distances between the shafts, ropes being cheaper as compared to belts.
Advantages of Rope Drives:-
1. It gives smooth, steady and quiet service.
2. They are little affected by outdoor condition.
3. They give high Mechanical efficiency.
4. The shaft may be out of strict alignment.
5. The power may be taken off in any direction.
Conclusion:-
You have learnt about introduction of gear train and it's types and rope drive and it's advantages in theory of machine.
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