Power transmission device for helicopter
AssigneeAdvanced Technology Institute of Commuter-Helicopter, Ltd.
InventorsTatsuhiko Goi, Nobuyuki Yamauchi
Life of this patent
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Abstract
The engines which have output shafts connected to traction speed change mechanisms via freewheel clutches are decelerated or accelerated at a desired speed change ratio and then rotate and drive a collector gear and a main rotor shaft. A part of output torque of the engines is diverted into gears to drive and rotate accessories and a tail rotor. Such an arrangement is useful for a power transmission for a helicopter in that it enables the speed of rotation of the main rotor to be varied while the speed of rotation of the engines is kept constant.
Claims3
A power transmission device for a helicopter, the device comprising:
- a traction speed change mechanism having a continuously variable speed change ratio, connected to an output shaft of an engine,
- a first sun gear connected to an output shaft of the traction speed change mechanism,
- a first planetary gear in mesh with the circumference of the first sun gear, and Journaled by a housing,
- a second sun gear connected to the output shaft of the engine,
- a second planetary gear in mesh with the circumference of the second sun gear,
- a ring gear of which inside teeth are in mesh with the first planetary gear and the second planetary gear,
- a carrier which picks up orbital motion of the second planetary gear to drive a collector gear, and
- a main rotor shaft which is directly connected to the collector gear to drive and rotate a main rotor.
Dependencies are inferred from the claim text.