Actuation system for a controllable pitch propeller
US6811376B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2002 |
| Grant date | Nov 2, 2004 |
| Priority date | — |
| Expiry date | Oct 12, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63H3/082
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A propeller control system provides for actuation through supply pressure only. A transfer bearing thereby requires only a single land. The supply pressure is metered at a pitch change valve within the rotating propeller shaft downstream of the transfer bearing to provide hydraulic pressure for actuation and control. A feather override mode is provided by energizing a feathering solenoid. The increased supply pressure changes the hydraulic force balance of the pitch change valve to allow the increased supply pressure into a Coarse Pitch chamber and simultaneously allow fluid within the Fine Pitch chamber to flow to drain pressure. The flow to drain changes the hydraulic balance on the Pitch Change Actuator Piston to drive a pitch link attached to each propeller blade and thereby change the pitch thereof towards coarse pitch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.