Rotor assembly with high lock-number blades
US10472057B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 2017 |
| Grant date | Nov 12, 2019 |
| Priority date | — |
| Expiry date | May 14, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C2027/7255
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An aircraft rotor assembly has a central hub and a plurality of rotor blades coupled to the hub for rotation with the hub about an axis, each blade having a Lock number of approximately 5 or greater. A lead-lag pivot for each blade is formed by a flexure coupling the associated blade to the hub. Each pivot is a radial distance from the axis and allows for in-plane lead-lag motion of the associated blade relative to the hub, each pivot allowing for in-plane motion from a neutral position of at least 1 degree in each of the lead and lag directions. Elastic deformation of the flexure produces a biasing force for biasing the associated blade toward the neutral position, and the biasing force is selected to achieve a first in-plane frequency of greater than 1/rev for each blade.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.