Aircraft-Engine Valve Mechanisms

390136

01/01/1939

Event
Pre-1964 SAE Technical Papers
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/390136
Pages
8
Citation
Young, V., "Aircraft-Engine Valve Mechanisms," SAE Technical Paper 390136, 1939, https://doi.org/10.4271/390136.
Additional Details
Publisher
Published
Jan 1, 1939
Product Code
390136
Content Type
Technical Paper
Language
English