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  • 1. GEARBOX
  • 2. MAIN POINTS Define Gearbox Why is manual gearbox ? obtaining Speeds in gearbox synchronized gear box
  • 3. MAIN POINTS Define Gearbox Why is manual gearbox ? obtaining Speeds in gearbox synchronized gear box
  • 4. DEFINE GEARBOX A gearbox is a collection of mechanical components thatdeliver maximum power from an engine by managing a series of gear ratios that in turn operate a transmission. Thesecomponents include: a gear selector, fork, collar, dog teeth and a gear set.
  • 5. MAIN POINTS Define Gearbox Why is manual gearbox ? obtaining Speeds in gearbox synchronized gear box
  • 6. WHY IS MANUAL GEARBOX ? Manual transmission gearboxes are thesimplest types of gearboxes and involve themanual movement of a sliding gear along thegearboxs main shaft using a shifter.
  • 7. WHY IS MANUAL GEARBOX ?  Although The manual gearbox is rare in modern cars, but is considered superior in sports cars. The ability to select any desired gear at will gives the driver a greater degree of control over the cars behavior than with most other types of gearboxes.  Manual gearboxes are also the least expensive to purchase and so are considered favorable in economy cars.
  • 8. PURPOSE• Transmissions use different gear ratios to multiply engine torque, helping the car to accelerate quicker at low speeds. Torque multiplication is directly related to the number of teeth on the input gear vs the output gear.• the gearbox allows the engine to use less fuel while providing more power
  • 9. MAIN POINTS Define Gearbox Why is manual gearbox ? obtaining Speeds in gearbox synchronized gear box
  • 10. NEUTRAL POSITION:- In this case the movable gearstick position isnt Dovetailed withthe layshaft and the output torquefrom the gearbox is zero.
  • 11. FIRST SPEED:- In this case the movable gear stickposition at which the main shaftwhere the first gear(the bigestdiameter) it is dovetailed with thesmallest one the lay shaft and this isto get the bigest gear ratio andmaximize the output torque resultingin mimimize the output speed.
  • 12. SECOND SPEED :- In this case the second gear (smallerthan the first one) is dovetailed with agear on the lay shaft (biger than whichused in the first speed) to obtain a gearratio less than the first one whichmean less torque and higher speed
  • 13. THIRD SPEED:-
  • 14. FORTH SPEED:-
  • 15. THE REVERSE SPEED: - In this case a idler gear is usedintermediate between the first gear and theone on the lay shaft to guarantee that themotion in the reverse dirction
  • 16. THE REVERSE SPEED: -
  • 17. MAIN POINTS Define Gearbox Why is manual gearbox ? obtaining Speeds in gearbox synchronized gear box
  • 18. SYNCHRONIZED GEAR BOX
  • 19. SYNCHRONIZER COMPONENTSThe Synchronizer is made up of the speedgear, synchronizer ring, synchronizer keys ,keysprings, clutch hub, and hub sleeve
  • 20. H OW D O E S S Y N C H RO N I Z A T I O N WO R K S ? 1-The speed gear is mounted on the output shaft. A needle roller bearing isinstalled between the speed gear and the output shaft, allowing the gear to rotatefreely on the shaft 2-The synchronizer ring – also called a blocker ring – is made of brass and isinstalled on the conical portion of the gear. Narrow grooves are cut in the inside areaof the synchronizer ring to provide the necessary clutch action of the gear. Threeequally spaced slots are cut on the outside surface for the synchronizer keys to fitinto.
  • 21. H OW D O E S S Y N C H RO N I Z A T I O N WO R K S ? 3-Two key springs are installed, one on each side of the clutch hubto hold the synchronizer keys in place against the hub sleeve. 4-The clutch hub is fit to the output shaft on splines and is securedby a snap ring 5-Three synchronizer keys are installed in the three equally spacedslots in the clutch hub and are aligned with the slots in thesynchronizer ring.
  • 22. H OW D O E S S Y N C H RO N I Z A T I O N WO R K S ? 6-The hub sleeve has internal splines that slip over the clutch hubsplines, engaging the spline teeth of the speed gear. An internalgroove cut in the center of the hub sleeve splines centers the hubsleeve. The hub sleeve is indexed by the three spring loadedsynchronizer keys
  • 23. Which are:- THE SYHCHRONIZATIONPHASE IS DONE ON THREE PHASES
  • 24. SYNCHRONIZED GEAR SHIFT –FIRST STAGE When the transmission is inneutral, the synchronizer keydetents hold the hub sleeve inthe neutral position
  • 25. SECOND STAGE The taper of the sleeve spline pushes against the taper of the ringteeth to exert more pressure on the gear cone
  • 26. THIRD STAGE When the speed of the hub sleeve and the gear become equal thehub sleeve engages the splines of the gear