Control system for propeller with controllable pitch
US4781533A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1986 |
| Grant date | Nov 1, 1988 |
| Priority date | — |
| Expiry date | Sep 30, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63H2003/088
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An actuating system for a controllable pitch propeller comprises a hydraulic servomotor arranged in the propeller hub and being connected mechanically to the propeller blades. Pressure medium is delivered to the servomotor, under the control of a control valve, from a pressure-medium source, which is connected to a stationary pressure-medium chamber which embraces a rotatable shaft connected to the propeller and which is sealed against the outer surface of the shaft and communicates, via a radial pressure-medium channel in the shaft, with an axial pressure-medium channel located in the shaft and extending to the hydraulic servomotor. The system further comprises an additional stationary pressure-medium chamber which embraces the shaft and seals against the outer surface thereof and which, via an additional radial pressure-medium channel in the shaft communicates with the axial pressure-medium channel in the shaft. The system also comprises an additional pressure-medium source, and each of the two pressure-medium sources can be connected alternatively to any one of the two pressure-medium chambers, whereby the actuating system can be operated in a substantially unchanged manner irre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.