Patent ID: 8523627

Claim:
A drive mechanism for a model helicopter, comprising: a battery powered motor comprising a toothed motor shaft; a main rotor, having a main shaft aligned with the motor shaft; and a reduction gear assembly comprising: a base, being passed through by the toothed motor shaft; three first gears, arranged around and meshed with the toothed motor shaft and on the base; three second gears, being smaller than the first gears in diameter and separately coaxially fixed on the first gears; three third gears, separately coaxially fixed on the second gears; and three fourth gears, being smaller than the third gears in diameter and separately coaxially fixed on the third gears; wherein the fourth gears are meshed with a main gear, and four shafts, which are axially parallel to the toothed motor shaft, separately axially pass through the fourth gears, the third gears, the second gears, and the first gears.