part of transmission and transaxle

1. Automotive
Transmission
K vector foundation’16
Manual transmission and Transaxle

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Back to history
-Purpose
-Origin
-Development

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Improved design

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Types of gears
Spur gear Spur rack gear Helical gear
Helical rack Spiral Bevel gear Straight Bevel gear

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-Spur gear

8. -Helical gear

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Spur Gears
Advantages
•They are cheap and easy to design and
manufacture
•They can transmit a large amount of power
Disadvantages
•They are slow gear speed
•They produce a lot of noise when they operate at high speed
•They wear at high rate

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Helical gears
Advantages
•They Operate smoothly and quietly
•They wear at low rate
• The longer teeth increasing contact area for
higher loads.
Disadvantages
•They are expensive compared with the spur gears
•They produce more heat
• Lateral force (lose power)

11. Types of meshing
External meshing

12. Internal meshing

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Gear Train
R inc. T inc. V dec.

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16. Final Gear Ratio
 Not just one ratio, but multiplied ratios
 Constant product ratio X The speed ratio

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As differential ratio is constant in each car so we
can change speed by changing the gear ratio in the
transmission system
Gear ratio
1st 2.97:1
2nd 2.07:1
3rd 1.43:1
4th 1.00:1
5th 0.84:1
6th 0.56:1
reverse -3.38:1
Note: the gear ratio is one ratio in transaxle while 2
multiplied ratios in manual transmission

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Manual Transmission

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-input shaft
-output shaft
-counter shaft
-gears
-Synchronizer
Main components
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Manual Transmission Gearbox
GEARBOX

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First gear (reduction) : Smallest gear in input to
largest gear in output so has the loosest ratio

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2nd gear (reduction)

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3rd gear (reduction)

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4th gear (direct shift): the speed of input shaft =
that of output shaft

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5th gear (overdrive)

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Reverse

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29. Synchronizer

30. Video 1

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Manual Transaxle
Gearbox

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38. Video 2

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Trans. (RWD) vs Transaxle (FWD)

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Transmission
2 ratios + the differential
ratio
Transaxle
1 ratio + axle ratio
Note: All ratios are multiplied to get the final drive ratio

41. RWD FWD
 Better weight
distribution
 Bear more load (exert
more torque)
 Understeering
 Less Energy lose
 Less Expensive
(less moving
particles)
 Oversteering
Relative comparison
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43. Shifting Mechanism
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