NEMESIS of aircraft valve mechanism is false motion, Mr. Young believes. False motion in valve gear, he explains, is any motion of parts other than the theoretical, and it affects any part of the mechanism from the valve to the cam, since high loadings can be encountered which far exceed the calculated stresses. The result often is failure, either partial or complete, he contends, and illustrates this point by diagrams of actual valve motion under operating conditions. Emphasis is placed on other effects from the same cause, such as high seating velocities.In a discussion of the hydraulic lash adjuster, the author stresses its effect on seating velocities and maintenance of fixed timing, referring particularly to air-cooled radial engines.The importance of reduced operating temperatures of the valves is pointed out in regard to increased strength, and to improved fatigue and corrosion resistance.


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    Title :

    Aircraft-Engine Valve Mechanisms


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    Pre-1964 SAE Technical Papers ; 1906



    Publication date :

    1939-01-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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