A pitch change apparatus (61a) is provided for a propeller assembly having a row of propeller blades (62a) which rotate around an axis of the assembly. The pitch change apparatus comprises a hydraulic actuator (63a) for angular displacement of propellers of the propeller assembly. The hydraulic actuator has a piston (81) and cylinder (80) arrangement which defines fine (82) and coarse (83) fluid chambers. Increasing the volume of the fine chamber at the expense of the coarse chamber results in angular displacement of the propellers to a finer pitch. Increasing the volume of the coarse chamber at the expense of the fine chamber results in angular displacement of the propellers to a coarser pitch. The pitch change apparatus (61a) further comprises one or more fine hydraulic lines (68a') carrying hydraulic fluid to and from the fine chamber (82), and a coarse hydraulic line (68a'') carrying hydraulic fluid to and from the coarse chamber (83). The apparatus further comprises a pressure-sensing check valve (85) which fluidly isolates the coarse chamber (83) from the coarse hydraulic line (68a'') if the pressure in the coarse hydraulic line (68a'') falls below a threshold pressure.


    Access

    Download


    Export, share and cite



    Title :

    Pitch change apparatus


    Additional title:

    Blattverstellungsvorrichtung
    Appareil de changement de pas


    Contributors:

    Publication date :

    2018-01-10


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    B64C AEROPLANES , Flugzeuge / B64D Ausrüstung für Flugzeuge , EQUIPMENT FOR FITTING IN OR TO AIRCRAFT



    Propeller assembly pitch change apparatus

    SWIFT ANDREW / MORGAN ANTONY | European Patent Office | 2018

    Free access

    Pitch change linkage

    SCHNEIDER GERARD MICHAEL / PETSCH LAWRENCE MICHAEL | European Patent Office | 2023

    Free access

    PITCH CHANGE LINKAGE

    SCHNEIDER GERARD MICHAEL / PETSCH LAWRENCE MICHAEL | European Patent Office | 2021

    Free access

    Pitch change apparatus for counter-rotating propellers

    GLYNN CHRISTOPHER CHARLES / ZATORSKI DAREK TOMASZ / YEAGER DONALD SCOTT et al. | European Patent Office | 2016

    Free access

    PITCH CHANGE APPARATUS FOR COUNTER-ROTATING PROPELLERS

    GLYNN CHRISTOPHER CHARLES / ZATORSKI DAREK TOMASZ / YEAGER DONALD SCOTT et al. | European Patent Office | 2019

    Free access