Fiber reinforced/epoxy matrix composite helicopter rotor torque tube
US4568246A · kind A · utility
9Cited by
7References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1983 |
| Grant date | Feb 4, 1986 |
| Priority date | — |
| Expiry date | Mar 22, 2003 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64C27/48
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A composite torque tube for a helicopter rotor hub is described. The torque tube contains upper and lower load bearing surfaces connected by two sidewall portions. Both the sidewall and load bearing portions contain filament wound glass fiber reinforced epoxy resin such fibers having a .+-.45.degree. orientation. The upper and lower load bearing portions additionally contain a plurality of multiaxially oriented plies of continuous unidirectionally oriented graphite fibers interleaved with the glass fibers so as to produce a torque tube with crack resistance, damage tolerance, light weight, strength and integrity inspectability.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.