Patent · US Expired

Rotor structure, especially for a rotary wing aircraft

US4778343A · kind A · utility

19Cited by

9References

5Claims

0Family size

Assignee

Messerschmitt-Boelkow-Blohm Gesellschaft mit beschraenkter Haftung · DE

Inventors

Michael Hahn · San Francisco, US
Gerald Kuntze-Fechner · Waakirchen, DE

Key dates

Filing date	Sep 29, 1987
Grant date	Oct 18, 1988
Priority date	—
Expiry date	Sep 29, 2007

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB64C27/51
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

In order to avoid a negative coupling between blade lead-lag movements and lade angle adjustment movements in a helicopter rotor, the angle (.beta.) between a control rod (5) for the blade angle adjustment and an effective damping plane (M) of the rotor is increased as compared to the respective angle in conventional rotors. This increase of the angle (.beta.) is accomplished by arranging a damping device (9) having the effective plane (M) for suppressing blade lead-lag movements in such a way on a blade angle control sleeve (4), that the effective plane (M) of the damping device (9) encloses an angle (.alpha.) with the lead-lag plane of the rotor.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.