The propulsion system has a hydraulic drive 3 connecting a first propulsor 1 co-axial with a second propulsor 2, in operation the drive exerts a torque on the first propulsor and an equal and opposite torque on the second propulsor. Also claimed is a propulsor having contra-rotating first and second propulsors 1,2 with a hydraulic drive 3 which develops a pure action-reaction torque pair between the propulsors and zero net torque-to-ground. A first unit 4 transfers oil from a stationary frame into a rotating frame of the first propulsor at a higher pressure such that most of the thrust developed is reacted internally using fluid forces within the first unit. A second unit 5 transfers oil back into the stationary frame from a rotating frame of the second propulsor at a lower pressure such that most of the thrust developed is reacted internally using fluid forces within the second unit. A set of bearings 21,22 ensures the axes of the two propulsors remain aligned and capable of carrying any residual thrust loads left after the oil-transfer units 4,5 have subtracted most of these thrusts.


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    Title :

    Contra-rotating hydraulic drive system for propulsion


    Contributors:

    Publication date :

    2024-04-17


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B64D Ausrüstung für Flugzeuge , EQUIPMENT FOR FITTING IN OR TO AIRCRAFT / B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING



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