Multi-bladed tail rotor hub design for coriolis relief
US6764280B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2002 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | Sep 11, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C27/82
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A multi-bladed tail rotor assembly is disclosed that provides higher aerodynamic performance, damage tolerant design with 10,000-hour life expectancy, and which requires low maintenance through the use of composites and elastomerics. The tail rotor hub assembly includes two stacked yoke assemblies having multi-bladed teetering rotors, each mounted on a single drive mast. Each yoke assembly includes a yoke hub having a transverse bore therethrough, a bearing assembly disposed within the bore, and retention means for aligning and securing the bearing assembly within the bore. Each bearing assembly includes a trunnion portion having trunnion arms that extend outwardly from a trunnion body portion, and an elastomeric bearing disposed about each trunnion arm. The tail rotor assembly utilizes a composite twist strap flexure to accommodate collective pitch control integral with each rotor blade.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.