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Mechanical Clutches

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  1. 1. Presented By – 12/2001 1
  2. 2. Clutches    A clutch is a mechanical device that provides for  the transmission of power (and therefore usually  motion) from one component (the driving  member) to another (the driven member) when  engaged, but can be disengaged. In the simplest application, clutches connect and  disconnect two rotating shafts (drive shafts or  line shafts). In these devices, one shaft is  typically attached to a motor or other power unit  (the driving member) while the other shaft (the  driven member) provides output power for work.  While typically the motions involved are rotary,  linear clutches are also possible. In a torque-controlled drill, for instance, one shaft  is driven by a motor and the other drives a drill  chuck. The clutch connects the two shafts so  that they may be locked together and spin at the  same speed (engaged), locked together but  spinning at different speeds (slipping), or  unlocked and spinning at different speeds  (disengaged). 2
  3. 3. Location of Clutches  Rear wheel drive     Front engine Rear engine Mid engine Front wheel drive 3
  4. 4. Construction Of Clutches Coil spring pressure plate (cover and pressure plate) 4
  5. 5. Splines to input shaft Of transmission  44-3  Construction of  the Clutch Clutch Disk or Friction Disk 5
  6. 6. Pilot Bushing or bearing 6
  7. 7.  Construction  of the Clutch Pressure plate & cover bolt to flywheel Flywheel bolts to crankshaft If there is a chance you will be reusing When unbolting pressure plate from the pressure plate, make alignment marks flywheel, remove bolts evenly as not to to flywheel to maintain proper balance bend the cover. REMEMBER, this is BEFORE removal pressure. under high spring 7
  8. 8. Pilot bushing or bearing in center of flywheel or crankshaft, supports the end of input shaft (friction disk) splined to transmission Input shaft (throw-out bearing T/O bearing) allows to push on rotating clutch fingers Bolted to Crank Bolted to flywheel - Applies the spring force to clamp the friction disk to the flywheel (clutch fork) pushes T/O bearing to release 8 rotating clutch
  9. 9. Pressure Plate Releases friction disk from flywheel Moves pressure Plate right T/O bearing Pivots 9
  10. 10. Clutch terms  Clutch disengaged Clutch pedal is in or down  Clutch engaged Clutch pedal is out or up What would it mean if someone said the clutch pedal Is engaged? Make sure you know if you are talking about the clutch or the clutch pedal !!! 10
  11. 11. Throw out Bearing (release bearing)  Slides on transmission input shaft bearing retainer 11
  12. 12. Clutches READ ON 12
  13. 13. Slipping clutch 13
  14. 14. Clutch Linkage  Can be very complicated Have the right amount of movement and direction without too much pedal pressure Wear Motor mounts Spring to pull T/O bearing away Has to be lubricated 14
  15. 15. Clutch fork T/O bearing hooks here Fulcrum point 15
  16. 16. Hydraulic clutch    Uses master cylinder and slave cylinder Uses brake fluid Must be bleed 16
  17. 17. Hydraulic clutch     Service just like you would hydraulic brakes No complicated linkage Can easily control mechanical advantage with piston sizes Self lubricating No motor mount problems 17
  18. 18. Slave cylinder Some are adjustable for free-play and some not 18
  19. 19. Cable clutch    No complicated linkage Flexibility No motor mount problems 19
  20. 20. Friction disks   Often made of asbestos Must be put in only one way Usually marked Clutch won’t release if wrong 20
  21. 21. Friction disks  Cushion springs Waved metal between clutch half's Dampen clutch engagement 21
  22. 22. Friction disks  Torsional springs Can be spring or rubber Dampen power impulses from crankshaft 22
  23. 23. Torsional Springs Has pins to limit amount of twist. Springs try to keep it centered between pins. Springs sometimes get weak and start rattling or fall out 23
  24. 24. Clutch disks Friction material isn’t very thick. Minimum thickness around .012” 12/2001 24
  25. 25. Types of Clutches (pressure plates)  Coil spring 9 spring 12 spring  3 fingers for T/O bearing to push on 25
  26. 26. Diaphragm-Spring Clutches 26
  27. 27. Diaphragm-Spring Clutches 27
  28. 28. Centrifugal Clutch  The faster the RPM, the harder the clutch disk is squeezed 28
  29. 29. Multi-plate Clutch 29
  30. 30. Conical Clutch 30
  31. 31. Clutch Safety Switch   Prevents from cranking with clutch engaged Some standard transmissions won’t let you take the key out and lock the steering column with out the transmission in reverse Prevents steering lock while moving forward 31
  32. 32. Checking pressure plate for warpage 32
  33. 33. Clutch Disk Replacement  Very wise to: Have flywheel surfaced (even with no runout or hot spots) Replace pilot bushing or bearing Replace T/O bearing Replace pressure plate (cover, plate springs) 33
  34. 34. Clutch Disk Replacement  Very wise to inspect & replace as necessary: Clutch fork & pivot Input shaft bearing retainer on transmission (where T/O bearing slides) Linkage, cable or hydraulic components Motor mounts Flywheel ring gear 34
  35. 35. Universal clutch alignment tool  Select end that fits tight in pilot bushing or bearing 35
  36. 36. Universal clutch alignment tool 36
  37. 37. Universal clutch alignment tool 37
  38. 38. Clutch Alignment tools (pilot shaft) 38