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Clutches &
Bands
Types of Friction
 Static Friction
 The friction that keeps the clutch from slipping
 Clutch material responsible for d...
What affects the C.O.F.
 Disc design
 Application time
 Reduces parasitic
drag
 Discs specific to ATF
type
Turning Clutch
Holds two rotating
components together
Clutch Drum
Piston O-ring
Piston Return
Spring
Snap Ring
Friction
Di...
Holding Clutch
Holds components to
transmission case Steel Plate
Friction
Disc
Snap Ring
Flange
Flange
Snap
Ring
Piston Re...
Multiplate Clutch Operation
6
Return Spring
Fluid
Pressure
Released
Check Ball
Drum Seal
Piston
Piston
CylinderInput
Shaft...
Centrifugal Fluid Pressure
Canceling C1 Clutch
C3 ClutchC2 Clutch
Chamber BChamber A
C1 ClutchPiston
Return Springs
 Diaphragm/Bellevelle
 Coil Spring
 Multiple Coil Springs
 Wave Plate
Snap Rings
 Selective
 Holds friction and
steels in drum
 Sets clutch pack
clearance
 Wave
 Used to hold
clutches in ...
Clutch Pack Clearance
 Use feeler gage to
check clearance
between pressure
plate and snap ring
 Rule of thumb!
 .005 pe...
Clutch Pack Clearance
 Use dial indicator to
check clearance
 Rule of thumb!
 .005 per disc
Correcting Clutch Pack
Clearance
 Most common
 Selective snap rings
 2nd most common
 Selective steels
 3rd most comm...
Clutch Pack Assembly
 Soak frictions prior to
install!
 Verify rotation of discs if
directional
 Lube piston seals and
...
Holding Devices
Multiplate Clutch
• Holds two rotating
components together
Brake
• Holds components to
transmission case
O...
Brake Band Components
Outer Spring
Direct Clutch
Drum
Piston Rod
Inner Spring
Servo
Piston
Cover
Second Coast
Brake Band
Band Types
 Flex Band (a)
 Inexpensive
 Conforms to drum
 Rigid Band
 Strong
 Good heat sink
 Double-Wrap Rigid Ban...
Brake Band Operation
Apply Pin
Servo Piston
Apply Pin
Servo Piston
Return Spring
Anchor Pin
Direction of
Drum Rotation
Bra...
Band Adjustment
Adjustable Anchor Pin Selective Servo Pin
Apply Lever length
 Make sure levers
don’t get mixed up!
 Lever length controls
apply time and force
 Strut length may
...
One-Way Sprag Clutch
Holds components in
one direction only
L1
One-Way Roller Clutch
Rollers
Springs
Outer Race
Inner Race
Mechanical Diode
One-WayClutchtheWRONGWAY
End Clutches and Bands
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012 Clutches & Bands

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Clutches and bands

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012 Clutches & Bands

  1. 1. Clutches & Bands
  2. 2. Types of Friction  Static Friction  The friction that keeps the clutch from slipping  Clutch material responsible for degree of static friction  Dynamic Friction  The friction created by the ATF and clutch plates as they engage  ATF and clutch disc material responsible for this friction
  3. 3. What affects the C.O.F.  Disc design  Application time  Reduces parasitic drag  Discs specific to ATF type
  4. 4. Turning Clutch Holds two rotating components together Clutch Drum Piston O-ring Piston Return Spring Snap Ring Friction Disc Steel Plate Pressure Plate Snap Ring
  5. 5. Holding Clutch Holds components to transmission case Steel Plate Friction Disc Snap Ring Flange Flange Snap Ring Piston Return Spring Piston O-ring
  6. 6. Multiplate Clutch Operation 6 Return Spring Fluid Pressure Released Check Ball Drum Seal Piston Piston CylinderInput Shaft Fluid Pressure Applied Seal Discs Ring Gear Plates Seal Piston Piston Check Ball
  7. 7. Centrifugal Fluid Pressure Canceling C1 Clutch C3 ClutchC2 Clutch Chamber BChamber A C1 ClutchPiston
  8. 8. Return Springs  Diaphragm/Bellevelle  Coil Spring  Multiple Coil Springs  Wave Plate
  9. 9. Snap Rings  Selective  Holds friction and steels in drum  Sets clutch pack clearance  Wave  Used to hold clutches in drum  Acts as a cushion spring as well  Internal  Goes inside a component  External  Goes outside a component
  10. 10. Clutch Pack Clearance  Use feeler gage to check clearance between pressure plate and snap ring  Rule of thumb!  .005 per disc
  11. 11. Clutch Pack Clearance  Use dial indicator to check clearance  Rule of thumb!  .005 per disc
  12. 12. Correcting Clutch Pack Clearance  Most common  Selective snap rings  2nd most common  Selective steels  3rd most common  Selective pressure plates
  13. 13. Clutch Pack Assembly  Soak frictions prior to install!  Verify rotation of discs if directional  Lube piston seals and drum  Twist piston after install…it should spin!  Wave spring first if equipped  Air check before you install & after!
  14. 14. Holding Devices Multiplate Clutch • Holds two rotating components together Brake • Holds components to transmission case One-way Clutch • Holds components in one direction only
  15. 15. Brake Band Components Outer Spring Direct Clutch Drum Piston Rod Inner Spring Servo Piston Cover Second Coast Brake Band
  16. 16. Band Types  Flex Band (a)  Inexpensive  Conforms to drum  Rigid Band  Strong  Good heat sink  Double-Wrap Rigid Band (b)  More flexible than rigid yet strong  Has better holding power than rigid
  17. 17. Brake Band Operation Apply Pin Servo Piston Apply Pin Servo Piston Return Spring Anchor Pin Direction of Drum Rotation Brake Band AppliedNot Applied
  18. 18. Band Adjustment Adjustable Anchor Pin Selective Servo Pin
  19. 19. Apply Lever length  Make sure levers don’t get mixed up!  Lever length controls apply time and force  Strut length may differ as well
  20. 20. One-Way Sprag Clutch Holds components in one direction only L1
  21. 21. One-Way Roller Clutch Rollers Springs Outer Race Inner Race
  22. 22. Mechanical Diode
  23. 23. One-WayClutchtheWRONGWAY
  24. 24. End Clutches and Bands

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