Modern Army Helicopters utilize single- or two-stage hydraulic actuator rod seals that must be capable of operating over the temperature range of -65F to +275F. These actuators are usually exposed to a high concentration of dust during take off and/or landing maneuvers and during very low level hover maneuvers. The rotor control actuators are subjected to a large number of small amplitude feedback cycles caused by the load imposed by each rotor blade. Helicopter actuators exposed to the environment desribed have not provided the desired reliability, maintainability, or safety. The objective of this program was to investigate and develop new and improved multiple cascaded seal configurations for hydraulic systems and actuators, thereby favorably impacting hydraulic system reliability, maintainability, safety, and cost by significantly reducing seal system leakage. The program clearly demonstrated the superiority of the multiple cascaded seal over the single-stage seal and provided data that can be used as a guideline for selection of the optimum number of seals in a given installation. (DePo)


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    Title :

    Hydraulic system seal development


    Additional title:

    Entwicklungen auf dem Gebiet der Dichtungen fuer Hydrauliksysteme


    Contributors:

    Published in:

    Publication date :

    1981


    Size :

    335 Seiten


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English




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