An ultra-safe, high ratio planetary transmission, forapplication as a helicopter main rotor final drive, has beendesigned, fabricated and tested. The transmission improvements arereduced weight, reduced noise and improved fail-safety andefficiency. This paper discusses the fabrication, assembly andtesting of the planetary transmission. An existing planetarytransmission utilized a two-stage conventional spur gear designwith fixed internal ring gears. The new double helical planetary(DHP) system design uses a compound planetary arrangement withstaggered planets and high contact ratio gearing in a uniqueconfiguration. Double helical gears in the planet to ring meshesbalance axial tooth forces without axial planet bearing reactions.The spur gear sun to planet meshes are staggered to achieve acompact arrangement. The sun gear is fully floating.
- Edition:
- 06
- Published:
- 10/01/2006
- Number of Pages:
- 14
- File Size:
- 1 file , 520 KB
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