Transmission In Maruti cars
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This document summarizes different types of vehicle transmissions, including manual, automatic, and auto-manual transmissions. It describes the key components of a manual transmission like the clutch, gearbox, differential, and drive shaft. Automatic transmissions are introduced as having no clutch and providing smoother gear shifts. An auto-manual transmission is described as automatically operating the clutch and commanding engine torque for gear shifts. Advanced features like detent pins for smoother gear changes are also summarized. The document concludes with a case study of repairing a fifth gear slippage issue in an SX4 vehicle.
![Name of Institution REVERSE SHIFT
PREVENTION
21
The cubic projection on the gear shift and select
lever is blocked by the projection of reverse shift
limit yoke when gear shift control lever is
shifted from 5th position to reverse position.
1. Gear shift and select lever
2. Reverse shift limit yoke
[A] : 5th
[B] : Reverse
[C] : 4th
As cubic projection of gear shift and select
lever pushes the reverse shift limit yoke, the
yoke rotates and pushes the cubic projection
of the lever toward the neutral position.
Gear is shifted into 4th position if gear shift
and select lever is still pushed toward
reverse position. Reverse shift limit yoke
returns to original position by spring force.](https://image.slidesharecdn.com/summerinternppt-131027013222-phpapp01d-141013151011-conversion-gate02/85/Transmission-In-Maruti-cars-21-320.jpg)
Transmission In Maruti cars
- 1. Name of Institution 1 Submitted By: Asha Kumari B.Tech. Semester VII MAE A PRESENTATION ON SUMMER TRAINING IN
- 2. Name of Institution CONTENTS Introduction Types of transmission Manual Transmission Components Automatic Transmission Auto Manual Transmission Advance Features Case study 2
- 3. Name of Institution TYPES OF TRANSMISSION Available in 4 types: Manual Transmission Automatic Transmission Auto-manual Transmission Continuous variable Transmission 3
- 4. Name of Institution MANUAL TRANSMISSION • Driver-operated clutch &a gear selector. • Parts of transmission system: ― Clutch ― Gear Box/Transaxle ― Differential ― Drive Shaft/Axle ― Transfer Gear Box • Advantages • Defects ― Abnormal noise ― Gear Engagement & Disengagement Problems ― Gear Jumping Out ― Oil Leakage 4
- 5. Name of Institution GEAR BOX 5 Front wheel Drive/transaxle Rear wheel Drive
- 6. Name of Institution REVERSE GEAR SHAFT Reverse gear shaft is generally located in the gear box above the input shaft. The reverse idler gear is located on this shaft. The idler gear is meshed with the reverse gear to reverse the motion of the vehicle. 6 Output shaft reverse gear Reverse Gear Shaft Countershaft reverse gear Countershaft Input Shaft Idler Gear
- 7. Name of Institution DIFFERENTIAL ASSEMBLY It is contained in the transmission unit in case of a transaxle. It is connected to the countershaft. The drive from the countershaft is transmitted to the differential and is then further transmitted to the drive shaft and then to the wheel. 7
- 8. GEAR SHIFT LEVERName of Institution The gear shift lever is present inside the drive compartment of the vehicle . The purpose of a gear shift lever is enable the driver to select different gears during the drive. The car may have 4 or 5 forward gears and a reverse gear which can be selected as per the driving needs . Gear shift lever mechanism is of 2 types 1. Direct shift type 2. Indirect shift type Direct Shift Indirect shift
- 9. Name of Institution SYNCHROMESH MECHANISM The synchromesh mechanism is used in the process of gear selection i.e. to mesh the desired gear with the main shaft . The speed of rotation of different set of gears is different due to different gear ratios. When the vehicle is in neutral there is a speed difference between main shaft and the gears. To synchronize the speeds of the main shaft and the desired gear the synchromesh mechanism is used. 9
- 10. Name of Institution SHIFT FORK 10 The shift fork is connected to the gear shift shaft, it is used to engage the hub assembly with the selected gear The shift fork is connected to the gear shift lever by the shift shaft When the gear is selected the corresponding shift forks which are connected to the shift shaft also move. During a gear change one shift fork moves one hub assembly away from the gear and another shift fork moves the hub assembly for the newly selected gear.
- 11. TRANSFER GEAR BOX Name of Institution The transfer gear box is controlled by the driver, the control is located in the vehicle compartment it is either in the form of a transfer lever or a button. The transfer gear box connects the drive from the engine to the second propeller shaft which transmits power to the front wheels of the vehicle. 11 The function of the transfer gear box is to distribute the torque generated in the engine to all four wheels of the vehicle.
- 12. Name of Institution 12
- 13. AUTOMATIC TRANSMISNSamIeO of NInstitution Automatic transmission or A/T has no clutch. Available in SX4, Vitara, A-Star Benefits: ―Smoother gear shifts ― Ideal for congested city driving ― Less tiring to the driver ― Adds comfort to driving 13
- 14. Name of Institution SPECIFICATION 81-40LS 3-element, 1-step, 2-phase with lock-up mechanism 2.0 2400 +/- 150 rpm Forward 4-speed, rev. 1-speed, Ravigneau planetary gear 1st 2.875 Front sun gear 24 2nd 1.568 Rear sun gear 30 3rd 1.000 Long pinion gear 20 4th 0.697 Short pinion gear 19 Rev 2.300 Ring gear 69 14 Primary Final P R N D 3 2 L Type Type Capacity Gear ratio Position Lubricant Oil pump Lubrication Cooling type Type Drive Type Transmission Shift mechanism One way clutch 1.023 4.277 Direct cable shifting Neutral, output shaft fixed, engine start Reverse Neutral, output shaft free, engine start Forward 1st <--->2nd<--->3rd<--->4th automatic shift Forward 1st <--->2nd<--->3rd (<---4th) automatic shift Forward 1st <--->2nd(<---3rd) automatic shift Forward 1st (<---2nd<---3rd) fixed Radiator-assisted cooling (water cooling) 5.8 litres Type Control components Reduction ratio 3 sets 3 sets Internal involute gear (non-crescent) Engine-driving Type Type Stall torque ratio Stall speed Torque converter Forced pumping type by oil pump SUZUKI ATF 3317 or MOBIL 3309 2 sets Number of teeth Wet type multi-plate clutch Wet type multi-plate brake
- 15. FUNCTION OF COMPONENTS Name of Institution 15 Symbol Part name Function C1 Forward clutch Meshes intermediate shaft with front sun gear C2 Direct clutch Meshes input shaft with planetary carrier C3 Reverse clutch Meshes intermediate shaft with rear sun gear B1 O/D & 2nd brake Fixes rear sun gear B2 Second brake Fixes rear sun gear B3 1st & reverse brake Fixes planetary carrier F1 One-way clutch No.1 Prevents rear sun gear form turning counterclockwise when B2 is active F2 One-way clutch No.2 Prevents planetary carrier from turning counterclockwise 1.Input shaft 2.Front sun gear 3.Rear sun gear 4.Planetary long pinion 5.Planetary short pinion 6.Planetary carrier 7.Ring gear 8.Counter drive gear 9.Counter driven gear 10.Differential drive pinion
- 16. Name of Institution ELECTRONIC CONTROL Valve Body Components Solenoid Operation Input / Output Table Control Details 16 S2 S1 SLT ST SL Solenoid Operation
- 17. Name of Institution AMT – OVERVIEW This system automatically manages the clutch and the gear engagement of a traditional mechanical gearbox (as in the image at right), it's an add-on kit that usually doesn't require important modifications to the vehicle/transmission It’s main functions are: —To automatically Operate the Vehicle Clutch during the vehicle Start up (pick-up) and during the gearshift maneuvers; — To automatically command the Engine Torque during gearshift maneuvers avoiding the Drivers action on the acclerator pedal; —To decide the Gear ratio in order to properly manage the Vehicle Drive. 17
- 18. Name of Institution BENEFITS 18 Fuel consumption Comfort: • No clutch pedal • Easy to use gearshift lever • No need to release the accelerator pedal during the gearshift Fun to drive: • Power-train still under driver control • “Perfect” gearshift in all conditions Safe: • Avoid the “wrong gearshift” • Avoid the engine stalls Durability increase of: • Clutch • Synchronizer
- 19. Name of Institution ADVANCE FEATURES For gear shifting mechanism “Detent Pin” technology is being used for reduced friction, smoother gear shift & better gear shift feel Functions of Detent pin — Location and positioning of the required gearshift position; — Locking in place once the gearshift position has been located — Ensuring precise and secure gearshift by means of a defined gearshift resistance; — Communicating a positive gearshift feel to the driver and a clear sensation that the gear has been engaged 19
- 20. Name of Institution DIAGONAL SHIFT ASSISTANCE Gear shift pattern Gear shift mechanism has been changed from rod type to cable type mechanism for smooth gear shift Weight for New reverse gear actuation mechanism has been reduced by 150gm making lightest in all MSIL models 20
- 21. Name of Institution REVERSE SHIFT PREVENTION 21 The cubic projection on the gear shift and select lever is blocked by the projection of reverse shift limit yoke when gear shift control lever is shifted from 5th position to reverse position. 1. Gear shift and select lever 2. Reverse shift limit yoke [A] : 5th [B] : Reverse [C] : 4th As cubic projection of gear shift and select lever pushes the reverse shift limit yoke, the yoke rotates and pushes the cubic projection of the lever toward the neutral position. Gear is shifted into 4th position if gear shift and select lever is still pushed toward reverse position. Reverse shift limit yoke returns to original position by spring force.
- 22. Name of Institution CASE STUDY Model Mileage Vehicle System SX4 VDI 3664 kms Transmission Problem: fifth gear slippage in SX4-D vehicle Action Taken: • 5th gear snap ring was found damaged. • It caused improper meshing between fifth gear and its counter gear, which caused chipping off or deep scoring on the gears. • All the affected parts( Gear, countershaft 5th, Gear,input Shaft 5th, Circlip, Hub Assy, 5th Speed Sync, Bearing,5th Gear Needle , Ring, Synchronizer) were replaced. 22
- 23. Name of Institution THANK YOU!! 23
Editor's Notes
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