Kamewa Ab

Sven-Ola Andersson

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 irrespective of faults in any of the two pressure-medium sources and irrespective of faults in any of the high-pressure seals of the two pressure-medium chambers.

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Kristinehamn, Sweden

Sven-Ola Andersson