Rotary, viscoelastic drag elastic-return and damping device for a rotorcraft rotor blade
US5141398A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1990 |
| Grant date | Aug 25, 1992 |
| Priority date | — |
| Expiry date | Oct 19, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C27/51
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
The invention relates to a drag elastic-return and damping device (28) for a blade, and a rotor head including it. The device (28) comprises a connecting rod (30) connected to the blade and transmitting its drag movements to a rotary member (29) for elastic return with incorporated damping whose outer armature (32) it causes to rotate about a coaxial inner armature (31) in order to shear at least one thin collar (33) of a viscoelastic elastomer about its axis (B). The connecting rod (30) is coupled by way of rotational joints (43, 44) to a sleeve (15) for attaching the blade to the hub (1), and to a lever (34) of the outer armature (32). The member (29) is supported at the periphery of the hub (1), between two adjacent blades, or in the sleeve for attaching an adjacent blade such that the corresponding connecting rod is mounted as an inter-blade tie. On the rotor head, each blade is articulated with the hub (1) by a spherical laminated thrust block (5).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.