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





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



2.1 Couplers

MAE 442 – Automotive Engineering 2006



2.1 Couplers

• Needs:

– Start and Stop

– Shift gears

• Solutions:

– Mechanical Coupler (clutch)

– Fluid Coupler (torque converter)

– Electrical Coupler (generator)




2.1.1 Clutches




2.1.1 Clutches




2.1.1 Clutch Operation


Engine Disengaged

With Transmission

Clutch pedal in

Engine Engaged

With Transmission

Clutch pedal out

Eric Klang

Eric Klang



2.1.1 Clutches




2.1.1 Clutches

Torque equations for clutches

dD


F = spring force (normal to surface)

m = friction coefficient

N = number of surfaces (= 2 for most cars)



2.1.1 Clutches




2.1.1 Clutch References

• http://auto.howstuffworks.com/clutch.htm

• Automotive Engineering Fundamentals

• MAE 442 Student Projects: – Automotive Clutches

– Clutch Assembly


http://auto.howstuffworks.com/clutch.htm

http://auto.howstuffworks.com/clutch.htm



2.1.2 Torque Converters





Turbine, Stator and Pump





Pump (driver) Turbine (driven)

Stator





References

• http://auto.howstuffworks.com/torque-

converter.htm

• Automotive Engineering 2006Fundamentals

• MAE 442 Student Projects:

– None Yet


http://auto.howstuffworks.com/torque-converter.htm






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2.2 Transmissions



2.2 Transmission Outline

2.2.1 Gears

2.2.2 Manual Transmissions2.2.3 Automatic Transmissions

2.2.4 CVT’s




2.2.1 Gears

• Spur

• Rack and pinion

• Internal

• Helical

• Herringbone

• Bevel

• Miter

• Worm




2.2.1 Gear Ratio

• Small = Pinion

• Large = Gear• Input vs. Output

• GR = dout /din




2.2.1 Gear Terminology




2.2.1 Gear Terminology

Gears mesh if Pitch and Pressure Angle match

Note: dout /din = Nout /Nin = GR


Pitch = N/dN = Number of Teeth

d = Diameter of Pitch Circle

Pressure AngleThrough Pitch Point

Tangent to Base Circle



2.2.1 Gear Pressure Angle

• Lower angle = more efficiency

• Higher angle = more clearance

• 20o

& 25o

standard




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




2.2.2 Manual Transmissions


Theoretical World Real World

Jetta Transmission Removal























2.2.2 Synchronizers




2.2.3 Automatic Transmissions
























2.2.4 CVT References

• CVT.ppt

• CVT Project.pdf




Homework 2.1

1. Problem 6




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