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### Gear train

1. GEAR TRAIN UN IT-4
2. INTRODUCTION GEAR TRAIN It’s a combination of wheels by means of which motion is transmitted from one shaft to another shaft
3. . Application
4. Introduction Velocity Ratio AND Train Value Of Gear Train TRAIN VALUE Positive value of train value indicates both driver and driven rotates in same direction Negative value of train value indicates driver and driven rotates in opposite direction
5. GEAR TRAINS Simple Gear Train Ordinary Gear Train Epicyclic Gear Train . Compound Gear Train . Simple Epicyclic Gear Train Non-Reverted Gear Train Reverted Gear Train Compound Epicyclic Gear Train
6. SIMPLE GEAR TRAIN . When there is only one gear on each shaft. Gear 1 is called Driver Gear 2 is called Driven or Follower NI TI = N2T2
7. PROBLEM Two parallel shafts are connected by a simple gear train. The speed of the driving gear and the driven gear is 360 rpm and 120 rpm respectively. The number of teeth on the driving gear is 30. Determine i) Speed ratio ii) The Train Value iii) Number of teeth on the driven or Follower
8. IDLE or INTERMEDIATE GEAR TRAIN .
9. . . IDLE or INTERMEDIATE GEAR TRAIN Its clear that from above ‘ intermediate gears do not affect the velocity Ratio’ NI TI = N2T2 N2 T2 = N3T3 N3 T3 = N4T4
10. Compound Gear Train .
11. .
12. COMPOUND GEAR TRAIN . ADVANTAGES 1. Larger speed ratio can be obtained with smaller gears 2. Different gears can be used in order to suit the given conditions. 3. Motion can be transmitted in the round bends and corners
13. . COMPOUND GEAR TRAIN
14. . PROBLEM
15. . PROBLEM
16. . PROBLEM
17. . PROBLEM
18. REVERTED GEAR TRAIN .
19. The centre distance between the shaft of gears 1 and 2 and 3 and 4 are the same REVERTED GEAR TRAIN
20. . .
21. EPICYCLIC GEAR TRAIN A gear train that consists of one or more outer gears rotating around a central gear. Epicylic gear trains are also known as planetary gear trains.
22. APPLICATIONS
23. TYPES TYPES 1. SIMPLE EPICYCLIC GEAR TRAIN 2. COMPOUND EPICYCLIC GEAR TRAIN
24. SIMPLE EPICYCLIC GEAR TRAIN When only one gear on each shaft in any epicyclic gear train is called simple epicyclic gear train
25. COMPOUND EPICYCLIC GEAR TRAIN When there are more than one gear on a shaft in any epicyclic gear train is called as compound epicyclic gear train
26. METHODS TO FIND VELOCITY RATIO 1. Tabulation Method 2. Algebraic or Formula Method
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