Module 2: Power Train

1
Module 2 Power Train
Eric Klang
The Rock 2005

• Getting the Power to the Pavement

MAE 442 Automotive Engineering 2006
2
Vehicle Layout
Rear engine / rear wheel drive
Mid engine / four wheel drive
Front engine / front wheel drive
Front engine / rear wheel drive
MAE 442 Automotive Engineering 2006
3
Drive Train Outline

• 2.1 Couplers
• 2.2 Transmissions
• 2.3 Differentials
• 2.4 Bearings
• 2.5 Axels
• 2.6 Brakes

Grease Fitting Locations
MAE 442 Automotive Engineering 2006
4
2.1 Couplers
MAE 442 Automotive Engineering 2006
5
2.1 Couplers

• Needs
• Start and Stop
• Shift gears
• Solutions
• Mechanical Coupler (clutch)
• Fluid Coupler (torque converter)
• Electrical Coupler (generator)

MAE 442 Automotive Engineering 2006
6
2.1.1 Clutches
MAE 442 Automotive Engineering 2006
7
2.1.1 Clutches
MAE 442 Automotive Engineering 2006
8
2.1.1 Clutch Operation
Engine Disengaged With Transmission Clutch pedal
in
Eric Klang
Engine Engaged With Transmission Clutch pedal out
Eric Klang
MAE 442 Automotive Engineering 2006
9
2.1.1 Clutches
MAE 442 Automotive Engineering 2006
10
2.1.1 Clutches
d
F spring force (normal to surface) m friction
coefficient N number of surfaces ( 2 for most
cars)
D
Torque equations for clutches
MAE 442 Automotive Engineering 2006
11
2.1.1 Clutches
MAE 442 Automotive Engineering 2006
12
2.1.1 Clutch References

• http//auto.howstuffworks.com/clutch.htm
• Automotive Engineering Fundamentals
• MAE 442 Student Projects
• Automotive Clutches
• Clutch Assembly

MAE 442 Automotive Engineering 2006
13
2.1.2 Torque Converters
MAE 442 Automotive Engineering 2006
14
2.1.2 Torque Converters
Turbine, Stator and Pump
MAE 442 Automotive Engineering 2006
15
2.1.2 Torque Converters
Turbine (driven)
Pump (driver)
Stator
MAE 442 Automotive Engineering 2006
16
2.1.2 Torque ConvertersReferences

• http//auto.howstuffworks.com/torque-converter.htm
  
• Automotive Engineering 2006 Fundamentals
• MAE 442 Student Projects
• None Yet

MAE 442 Automotive Engineering 2006
17
2.2 Transmissions
MAE 442 Automotive Engineering 2006
18
2.2 Transmission Outline

• 2.2.1 Gears
• 2.2.2 Manual Transmissions
• 2.2.3 Automatic Transmissions
• 2.2.4 CVTs

MAE 442 Automotive Engineering 2006
19
2.2.1 Gears

• Spur
• Rack and pinion
• Internal
• Helical
• Herringbone
• Bevel
• Miter
• Worm

MAE 442 Automotive Engineering 2006
20
2.2.1 Gear Ratio

• Small Pinion
• Large Gear
• Input vs. Output
• GR dout /din

MAE 442 Automotive Engineering 2006
21
2.2.1 Gear Terminology
MAE 442 Automotive Engineering 2006
22
2.2.1 Gear Terminology
Pitch N/d N Number of Teeth d Diameter
of Pitch Circle
Pressure Angle Through Pitch Point Tangent to
Base Circle

• Gears mesh if Pitch and Pressure Angle match
• Note dout /din Nout /Nin GR

MAE 442 Automotive Engineering 2006
23
2.2.1 Gear Pressure Angle

• Lower angle more efficiency
• Higher angle more clearance
• 20o 25o standard

MAE 442 Automotive Engineering 2006
24
2.2.1 Gear Animations

• gear_teeth_contact.mov
• involute_curve.mov
• spur_gear.mov
• helical_gears.mov
• bevel_gears.mov
• worm_gears.mov
• herringbone_gears.mov

MAE 442 Automotive Engineering 2006
25
2.2.2 Manual Transmissions
Real World
Theoretical World
Jetta Transmission Removal
MAE 442 Automotive Engineering 2006
26
2.2.2 Manual Transmissions
MAE 442 Automotive Engineering 2006
27
2.2.2 Manual Transmissions
MAE 442 Automotive Engineering 2006
28
2.2.2 Manual Transmissions
MAE 442 Automotive Engineering 2006
29
2.2.2 Manual Transmissions
MAE 442 Automotive Engineering 2006
30
2.2.2 Manual Transmissions
MAE 442 Automotive Engineering 2006
31
2.2.2 Synchronizers
MAE 442 Automotive Engineering 2006
32
2.2.3 Automatic Transmissions
MAE 442 Automotive Engineering 2006
33
2.2.3 Automatic Transmissions
MAE 442 Automotive Engineering 2006
34
2.2.3 Automatic Transmissions
MAE 442 Automotive Engineering 2006
35
2.2.3 Automatic Transmissions
MAE 442 Automotive Engineering 2006
36
2.2.3 Automatic Transmissions
MAE 442 Automotive Engineering 2006
37
2.2.3 Automatic Transmissions
MAE 442 Automotive Engineering 2006
38
2.2.4 CVT References

• CVT.ppt
• CVT Project.pdf

MAE 442 Automotive Engineering 2006
39
Homework 2.1

• Problem 6

MAE 442 Automotive Engineering 2006
40
(No Transcript)