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Gear transmission system
- 1. Gear Transmission System Prepared by: 10BME009HUN RAJU 10BME033 PRAJAPATI ANKIT 10BME043 TEJANI ANKIT 10BME058 PRAJAPATI JIGAR
- 2. Contents • Functions ofTransmission • Need of Transmission • Type of Gear Transmission • Sliding mesh type gear box • Constant Mesh Type Gear Box • Synchromesh Gear Box • Epicyclic Gear Box • Wilson Gear Box • Borg Warner Gear Box
- 3. Function of Transmission 1.At low speeds, the torque produced by an IC engine is very high, which increases with increase of speed, peaks at some optimum speed and starts decreasing beyond that. 2. The transmission also provides a neutral position so that the engine and the road wheels are disconnected even with the clutch in the engaged position. 3. A means to back the car by reversing the direction of rotation of the drive is also provided by the transmission.
- 4. Need of Transmission •Variation of resistance to the vehicle motion at various speeds • Variation of tractive effort of the vehicle available at various speeds
- 5. Types of GearTransmission Manual Sliding Mesh Type Of Gear Box Constant Mesh Gear Box Synchromesh Gear Box Automatic Epicyclic Gear Box Wilson Gear Box Borg Warner Gear Box
- 6. Sliding Mesh TypeOf Gear Box It is simplest type of gear box out of the available gear box Gears are changed by sliding one gear on the other At a time only one gear is meshing with another gear
- 7. Sliding Mesh TypeGear Box Sliding mesh type gear box in neutral position
- 8. Sliding Mesh TypeOf Gear Box
- 9. Sliding Mesh TypeOf Gear Box
- 10. Sliding Mesh TypeOf Gear Box
- 11. Sliding Mesh TypeOf Gear Box
- 12. Sliding Mesh TypeOf Gear Box
- 13. Sliding Mesh TypeOf Gear Box
- 14. Constant Mesh TypeGear Box In this type of gear box, all the gears are in constant mesh with the corresponding gears on the lay-shaft The gears on the main shaft which is splined, are free The dog clutches are provided which are free to slide on the main shaft The gear on the main shaft are, however, fixed
- 15. Constant Mesh TypeGear Box
- 16. Double Declutching For smoothengagement of the dog clutches, it is necessary that speed of main shaft gear and the sliding dog must be equal To obtain lower gear the speed of the clutch shaft, lay shaft and main shaft gear must be increased this is done by Declutching
- 17. Procedure For DoubleDeclutching The clutch is disengaged and the gear is brought to neutral Then the clutch is engaged and accelerator pedal pressed to increased the speed of the main shaft gears After this the clutch is again disengaged and the gear moved to the required lower gear and clutch is again engaged As the clutch is disengaged twice in this process, it is called Double Declutching
- 18. Synchromesh Gear Box Theworking of above gear is similar to constant mesh type gear, but in the former there is one definite improvement over the latter There is the provision of synchromesh device which avoids the necessity of double de-clutching The parts which ultimately are to be engaged, are first brought into frictional contact which equalizes their speed, after which these may be engaged smoothly
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- 20. Epicyclic Gear Box Anepicyclic gear box contains two, three or even four epicyclic or planetary gear sets. • A simple gear set has a sun gear, about which planet turn around. • These planet gears are carried by a carrier and a shaft and are also in mesh internally with a ring gear, which is also called annulus or internal gear sometimes. • Different torque ratios i.e. speed ratios are obtained by making any one of the parts, viz, the sun gear, the planet gear and the annulus stationary.
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- 23. Wilson Gear Box •Various gear ratios are obtained as follws: Direct Gear: This is done by locking S1 to A by applying the clutch C. In this position we get a solid drive and direct gear is obtained Third gear: S1 is held stationary by means of brake B1. In this position, arm A1 is coupled to ring R2 and arm A2 is coupled to ring R1
- 24. Wilson Gear Box Secondgear: Brake B2 is applied to keep the ring R2 stationary. The sun gear S2 is already fixed to the engine shaft A. Arm A2 is also coupled to the ring R1 First gear: Brake B3 is applied to obtain the low gear Reversed gear: Brake B4 is applied which holds the ring R4 stationary
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- 26. Borg Warner GearBox It is simply a combination of the torque converter and epicyclic gear trains The turbine of the torque converter drives the ring gear of the first gear train through e free wheel The drive to the ring gear of the second gear train is then taken from the planet carrier of the first train so that the two act in series