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Chapter 7

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Helicopter main rotor gearbox

Helicopter main rotor gearbox

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  • Mercury is used as the weight to move shoes out.
  • Similar in operation to other centrifugal clutches.Engagement 29000 to 33300 RPMSprings retract shoes at shut down
  • Each A frame has a spherical bearing at the apex.Four deck fittings are used. Each fitting contains one spherical bearing that the A frames attach to.The isolation mount is made from layers of elastomer and metal. The isolation mount limits the fore & aft movement.
  • Spike indicates movement of MGB beyond design limits if it is not attached.

Transcript

  • 1. Chapter 7Main Rotor Transmission
  • 2. Introduction • Main rotor speeds operated in the 300 – 500 RPM range • Piston engine output speeds 2800 – 3200 RPM • Turbine engine output speeds 6000 – 20000 RPMBCIT Aerospace Author: Steve Mullis
  • 3. Purpose • Primary – Reduce engine RPM • Secondary – Change drive directionBCIT Aerospace Author: Steve Mullis
  • 4. ConfigurationsBCIT Aerospace Author: Steve Mullis
  • 5. ConfigurationsBCIT Aerospace Author: Steve Mullis
  • 6. ConfigurationsBCIT Aerospace Author: Steve Mullis
  • 7. ConfigurationsBCIT Aerospace Author: Steve Mullis
  • 8. Engine to MGB couplings Bell 47 – Gear with adapter plateBCIT Aerospace Author: Steve Mullis
  • 9. Engine to MGB couplings Hiller 12 – Flexible rubber and steel couplingBCIT Aerospace Author: Steve Mullis
  • 10. Engine to MGB couplings Belt driven systemBCIT Aerospace Author: Steve Mullis
  • 11. Engine to MGB couplings Driveshaft with flexible couplingsBCIT Aerospace Author: Steve Mullis
  • 12. Engine to MGB couplings • Consists of – Shaft – Two greased flexible couplings • Allows for momentary misalignment between the MGB & engineBCIT Aerospace Author: Steve Mullis
  • 13. Engine to MGB couplings Installed between the overrunning clutch and the MGBBCIT Aerospace Author: Steve Mullis
  • 14. Engine to MGB couplings Gimbal ring and liaison tube to provide engine to MGB alignment and support Driveshaft with flexible couplings to deliver engine power to MGBBCIT Aerospace Author: Steve Mullis
  • 15. Engine to MGB couplingsBCIT Aerospace Author: Steve Mullis
  • 16. MaintenanceBCIT Aerospace Author: Steve Mullis
  • 17. Clutches • Required for aircraft with recip. engines and fixed power turbine engines • Disengages the MGB from engine during startingBCIT Aerospace Author: Steve Mullis
  • 18. Clutches Centrifugal force locks clutch with frictionBCIT Aerospace Author: Steve Mullis
  • 19. ClutchesBCIT Aerospace Author: Steve Mullis
  • 20. ClutchesBCIT Aerospace Author: Steve Mullis
  • 21. Clutches • Belt tensioners – R22, R44 – Increases tension on the belts – Engaged by pilot – Mechanical – Lever – Electrical – linear actuatorBCIT Aerospace Author: Steve Mullis
  • 22. Freewheels • Prevent the rotor from turning the engine • One-way drive device • Sprag type is the most common in North AmericaBCIT Aerospace Author: Steve Mullis
  • 23. FreewheelsBCIT Aerospace Author: Steve Mullis
  • 24. Freewheels Sprags have the shape of a peanut or figure-eightBCIT Aerospace Author: Steve Mullis
  • 25. SpragBCIT Aerospace Author: Steve Mullis
  • 26. FreewheelsBCIT Aerospace Author: Steve Mullis
  • 27. Freewheels • Bell 206 – Located on the PTO of the engine gearbox – Lubrication supplied from MGB oil system – Airframe part – Drives tail rotor driveBCIT Aerospace Author: Steve Mullis
  • 28. FreewheelsBCIT Aerospace Author: Steve Mullis
  • 29. Freewheels • MD 500 – Located between the engine PTO and the engine driveshaft – Self contained splash lubrication – Hand packed front bearingBCIT Aerospace Author: Steve Mullis
  • 30. FreewheelsBCIT Aerospace Author: Steve Mullis
  • 31. FreewheelsBCIT Aerospace Author: Steve Mullis
  • 32. TorquemeterBCIT Aerospace Author: Steve Mullis
  • 33. TorquemeterBCIT Aerospace Author: Steve Mullis
  • 34. Rotor BrakeBCIT Aerospace Author: Steve Mullis
  • 35. Rotor BrakeBCIT Aerospace Author: Steve Mullis
  • 36. MaintenanceBCIT Aerospace Author: Steve Mullis
  • 37. MountsBCIT Aerospace Author: Steve Mullis
  • 38. MountsBCIT Aerospace Author: Steve Mullis
  • 39. MountsBCIT Aerospace Author: Steve Mullis
  • 40. MountsBCIT Aerospace Author: Steve Mullis
  • 41. MountsBCIT Aerospace Author: Steve Mullis
  • 42. Mounts “A” Frames Isolation Mount Deck FittingsBCIT Aerospace Author: Steve Mullis
  • 43. Mounts Fig. 7-31 Spike & isolation mount system used on the Bell 206BCIT Aerospace Author: Steve Mullis
  • 44. MountsBCIT Aerospace Author: Steve Mullis
  • 45. MountsBCIT Aerospace Author: Steve Mullis
  • 46. MountsBCIT Aerospace Author: Steve Mullis
  • 47. TransmissionsBCIT Aerospace Author: Steve Mullis
  • 48. TransmissionsBCIT Aerospace Author: Steve Mullis
  • 49. TransmissionsBCIT Aerospace Author: Steve Mullis
  • 50. TransmissionsBCIT Aerospace Author: Steve Mullis
  • 51. TransmissionsBCIT Aerospace Author: Steve Mullis
  • 52. TransmissionsBCIT Aerospace Author: Steve Mullis
  • 53. TransmissionsBCIT Aerospace Author: Steve Mullis
  • 54. TransmissionsBCIT Aerospace Author: Steve Mullis
  • 55. TransmissionsBCIT Aerospace Author: Steve Mullis
  • 56. TransmissionsBCIT Aerospace Author: Steve Mullis
  • 57. TransmissionsBCIT Aerospace Author: Steve Mullis