Rotor brake and windmilling lubrication system for geared turbofan engine
US7849668B2 · kind B2 · utility
32Cited by
11References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 25, 2006 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | Sep 22, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF05D2270/09
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A journal bearing provides lubrication to planetary gears during windmilling operation of a fan section. A primary oil pump provides oil from an oil supply during driven operation of the fan and a secondary oil pump driven by a generator provides oil during windmilling operation of the fan. The generator acts as a dynamic brake when the aircraft is grounded to prevent windmilling. A switch selects between the primary and secondary oil pump and controls the brake application.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.