vinoth auto ppt
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Module 2: Power Train
“Getting the Power to the Pavement”
MAE 442 – Automotive En ineerin 2006
Eric Klang
The Rock 2005
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Drive Train Outline
2.1 Couplers
2.2 Transmissions
2.3 Differentials2.4 Bearings
2.5 Axels
2.6 Brakes
MAE 442 – Automotive En ineerin 2006
Grease Fitting Locations
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2.1 Couplers
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2.1 Couplers
• Needs:
– Start and Stop
– Shift gears
• Solutions:
– Mechanical Coupler (clutch)
– Fluid Coupler (torque converter)
– Electrical Coupler (generator)
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2.1.1 Clutches
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2.1.1 Clutches
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2.1.1 Clutch Operation
MAE 442 – Automotive Engineering 2006
Engine Disengaged
With Transmission
Clutch pedal in
Engine Engaged
With Transmission
Clutch pedal out
Eric Klang
Eric Klang
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2.1.1 Clutches
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2.1.1 Clutches
Torque equations for clutches
dD
MAE 442 – Automotive Engineering 2006
F = spring force (normal to surface)
m = friction coefficient
N = number of surfaces (= 2 for most cars)
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2.1.1 Clutches
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2.1.1 Clutch References
• http://auto.howstuffworks.com/clutch.htm
• Automotive Engineering Fundamentals
• MAE 442 Student Projects: – Automotive Clutches
– Clutch Assembly
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2.1.2 Torque Converters
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2.1.2 Torque Converters
Turbine, Stator and Pump
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2.1.2 Torque Converters
Pump (driver) Turbine (driven)
Stator
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2.1.2 Torque Converters
References
• http://auto.howstuffworks.com/torque-
converter.htm
• Automotive Engineering 2006Fundamentals
• MAE 442 Student Projects:
– None Yet
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2.2 Transmissions
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2.2 Transmission Outline
2.2.1 Gears
2.2.2 Manual Transmissions2.2.3 Automatic Transmissions
2.2.4 CVT’s
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2.2.1 Gears
• Spur
• Rack and pinion
• Internal
• Helical
• Herringbone
• Bevel
• Miter
• Worm
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2.2.1 Gear Ratio
• Small = Pinion
• Large = Gear• Input vs. Output
• GR = dout /din
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2.2.1 Gear Terminology
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2.2.1 Gear Terminology
Gears mesh if Pitch and Pressure Angle match
Note: dout /din = Nout /Nin = GR
MAE 442 – Automotive Engineering 2006
Pitch = N/dN = Number of Teeth
d = Diameter of Pitch Circle
Pressure AngleThrough Pitch Point
Tangent to Base Circle
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2.2.1 Gear Pressure Angle
• Lower angle = more efficiency
• Higher angle = more clearance
• 20o
& 25o
standard
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2.2.1 Gear Animations
1. gear_teeth_contact.mov
2. involute_curve.mov
3. spur_gear.mov
4. helical_gears.mov
5. bevel_gears.mov
6. worm_gears.mov
7. herringbone_gears.mov
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2.2.2 Manual Transmissions
MAE 442 – Automotive Engineering 2006
Theoretical World Real World
Jetta Transmission Removal
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2.2.2 Manual Transmissions
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2.2.2 Manual Transmissions
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2.2.2 Manual Transmissions
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2.2.2 Manual Transmissions
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2.2.2 Manual Transmissions
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2.2.2 Synchronizers
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2.2.3 Automatic Transmissions
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2.2.3 Automatic Transmissions
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2.2.3 Automatic Transmissions
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2.2.3 Automatic Transmissions
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2.2.3 Automatic Transmissions
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2.2.3 Automatic Transmissions
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2.2.4 CVT References
• CVT.ppt
• CVT Project.pdf
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Homework 2.1
1. Problem 6
MAE 442 – Automotive Engineering 2006
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