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GEARBOX
MAIN POINTS

 Define Gearbox

 Why is manual gearbox ?

 obtaining Speeds in gearbox

 synchronized gear box
MAIN POINTS

 Define Gearbox

 Why is manual gearbox ?

 obtaining Speeds in gearbox

 synchronized gear box
DEFINE GEARBOX

  A gearbox is a collection of mechanical components that
deliver maximum power from an engine by managing a series
  of gear ratios that in turn operate a transmission. These
components include: a gear selector, fork, collar, dog teeth and
                          a gear set.
MAIN POINTS

 Define Gearbox

 Why is manual gearbox ?

 obtaining Speeds in gearbox

 synchronized gear box
WHY IS MANUAL GEARBOX ?


 Manual transmission gearboxes are the
simplest types of gearboxes and involve the
manual movement of a sliding gear along the
gearbox's main shaft using a shifter.
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 car's
 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.
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
MAIN POINTS

 Define Gearbox

 Why is manual gearbox ?

 obtaining Speeds in gearbox

 synchronized gear box
NEUTRAL POSITION:-
 In this case the movable gear
stick position isn't Dovetailed with
the layshaft and the output torque
from the gearbox is zero.
FIRST SPEED:-
 In this case the movable gear stick
position at which the main shaft
where the first gear(the bigest
diameter) it is dovetailed with the
smallest one the lay shaft and this is
to get the bigest gear ratio and
maximize the output torque resulting
in mimimize the output speed.
SECOND SPEED :-
 In this case the second gear (smaller
than the first one) is dovetailed with a
gear on the lay shaft (biger than which
used in the first speed) to obtain a gear
ratio less than the first one which
mean less torque and higher speed
THIRD SPEED:-
FORTH SPEED:-
THE REVERSE SPEED: -
 In this case a idler gear is used
intermediate between the first gear and the
one on the lay shaft to guarantee that the
motion in the reverse dirction
THE REVERSE SPEED: -
MAIN POINTS

 Define Gearbox

 Why is manual gearbox ?

 obtaining Speeds in gearbox

 synchronized gear box
SYNCHRONIZED GEAR
       BOX
SYNCHRONIZER
             COMPONENTS
The Synchronizer is made up of the speed
gear, synchronizer ring, synchronizer keys ,key
springs, clutch hub, and hub sleeve
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 is
installed between the speed gear and the output shaft, allowing the gear to rotate
freely on the shaft

 2-The synchronizer ring – also called a blocker ring – is made of brass and is
installed on the conical portion of the gear. Narrow grooves are cut in the inside area
of the synchronizer ring to provide the necessary clutch action of the gear. Three
equally spaced slots are cut on the outside surface for the synchronizer keys to fit
into.
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 hub
to hold the synchronizer keys in place against the hub sleeve.
 4-The clutch hub is fit to the output shaft on splines and is secured
by a snap ring
 5-Three synchronizer keys are installed in the three equally spaced
slots in the clutch hub and are aligned with the slots in the
synchronizer ring.
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 hub
splines, engaging the spline teeth of the speed gear. An internal
groove cut in the center of the hub sleeve splines centers the hub
sleeve. The hub sleeve is indexed by the three spring loaded
synchronizer keys
Which are:-
 THE SYHCHRONIZATION
PHASE IS DONE ON THREE
         PHASES
SYNCHRONIZED GEAR
       SHIFT –FIRST STAGE
 When the transmission is in
neutral, the synchronizer key
detents hold the hub sleeve in
the neutral position
Gearbox
SECOND STAGE

 The taper of the sleeve spline pushes against the taper of the ring
teeth to exert more pressure on the gear cone
Gearbox
THIRD STAGE

 When the speed of the hub sleeve and the gear become equal the
hub sleeve engages the splines of the gear
Gearbox
Gearbox
Gearbox
Gearbox
Gearbox

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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 that deliver maximum power from an engine by managing a series of gear ratios that in turn operate a transmission. These components 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 the simplest types of gearboxes and involve the manual movement of a sliding gear along the gearbox's 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 car's 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 gear stick position isn't Dovetailed with the layshaft and the output torque from the gearbox is zero.
  • 11. FIRST SPEED:-  In this case the movable gear stick position at which the main shaft where the first gear(the bigest diameter) it is dovetailed with the smallest one the lay shaft and this is to get the bigest gear ratio and maximize the output torque resulting in mimimize the output speed.
  • 12. SECOND SPEED :-  In this case the second gear (smaller than the first one) is dovetailed with a gear on the lay shaft (biger than which used in the first speed) to obtain a gear ratio less than the first one which mean less torque and higher speed
  • 15. THE REVERSE SPEED: -  In this case a idler gear is used intermediate between the first gear and the one on the lay shaft to guarantee that the motion in the reverse dirction
  • 17. MAIN POINTS  Define Gearbox  Why is manual gearbox ?  obtaining Speeds in gearbox  synchronized gear box
  • 19. SYNCHRONIZER COMPONENTS The Synchronizer is made up of the speed gear, synchronizer ring, synchronizer keys ,key springs, 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 is installed between the speed gear and the output shaft, allowing the gear to rotate freely on the shaft  2-The synchronizer ring – also called a blocker ring – is made of brass and is installed on the conical portion of the gear. Narrow grooves are cut in the inside area of the synchronizer ring to provide the necessary clutch action of the gear. Three equally spaced slots are cut on the outside surface for the synchronizer keys to fit into.
  • 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 hub to hold the synchronizer keys in place against the hub sleeve.  4-The clutch hub is fit to the output shaft on splines and is secured by a snap ring  5-Three synchronizer keys are installed in the three equally spaced slots in the clutch hub and are aligned with the slots in the synchronizer 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 hub splines, engaging the spline teeth of the speed gear. An internal groove cut in the center of the hub sleeve splines centers the hub sleeve. The hub sleeve is indexed by the three spring loaded synchronizer keys
  • 23. Which are:- THE SYHCHRONIZATION PHASE IS DONE ON THREE PHASES
  • 24. SYNCHRONIZED GEAR SHIFT –FIRST STAGE  When the transmission is in neutral, the synchronizer key detents hold the hub sleeve in the neutral position
  • 26. SECOND STAGE  The taper of the sleeve spline pushes against the taper of the ring teeth to exert more pressure on the gear cone
  • 28. THIRD STAGE  When the speed of the hub sleeve and the gear become equal the hub sleeve engages the splines of the gear