Patent · US Expired

Rotor structure, especially for rotary wing aircraft

US4690616A · kind A · utility

16Cited 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	Jul 14, 1986
Grant date	Sep 1, 1987
Priority date	—
Expiry date	Jul 14, 2006

Classification

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

Abstract

A rotor for a rotary wing aircraft has two damping structures on the outs of the blade angle adjustment sleeve. Each damping structure is a sandwich of an elastomeric layer between two stiff cover layers. A two-armed strut passes through the blade neck and is connected at its center in a pivoting manner to the blade root. The threaded outer ends of the two-armed struts pass through the respective sandwich for yieldingly connecting the radially inner end of the blade angle adjustment sleeve to the blade root. By tightening nuts on the threaded strut arms the elastomeric layer may be compressed. Thus, the damping structure performs, in addition to the damping function, a connecting function for the blade angle adjustment sleeve.

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