Coaxial twin-rotor type helicopter
US6293492A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 1, 1999 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | Sep 1, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C27/52
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A one-man helicopter 1 in which a drive transmission 10 that transmits driving force to upper and lower rotors 5 and 6 comprises first and second planet gear mechanisms 100 and 200 provided with a common carrier 104. When the common carrier 104 is rotated by a motor 301, a differential motion is generated between the two planet gear mechanisms. This results in the rotors being rotated at different velocities, which can be used to control yaw. A fore-and-aft swing mechanism 400 and right-and-left swing mechanism 500 depend from the lower end of a vertical shaft 41 on which the rotors are supported. Moving a stick 8 forward or backward, or to either side, tilts the vertical shaft 41 in the same direction. When the stick 8 is not subjected to a controlling force, the vertical shaft 41 reverts automatically to its original vertical state. This configuration makes it possible to realize a coaxial twin-rotor type helicopter having a compact, structurally simple control mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.