Accession Number : ADA298641

Title :   Influence of Tooth Profile Modification on Spur Gear Dynamic Tooth Strain.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Oswald, Fred B. ; Townsend, Dennis P.

PDF Url : ADA298641

Report Date : JUN 1995

Pagination or Media Count : 11

Abstract : This paper presents results of dynamic strain gage measurements performed on the NASA gear-noise rig. The experiments were part of a joint research program between NASA and the U.S. Army Research Laboratory to advance the technology of rotorcraft transmissions. Tests were performed on six sets of low contact ratio spur gears with different tooth profile modifications. Results presented include static and dynamic measurements of gear tooth strain taken over a matrix of operating conditions. The results demonstrate that a well-designed tooth profile modification can significantly reduce dynamic loads in spur gears, especially for gears which operate at high speed and under high torque. The two parabolic modifications tested were not as effective as linear modifications, possibly because the modification zone was too long. (MM)

Descriptors :   *TRANSMISSION GEARS, *ROTARY WING AIRCRAFT, *MACHINERY NOISE, *GEAR TEETH, MODIFICATION, STIFFNESS, HELICOPTERS, STRAIN GAGES, DYNAMIC LOADS, TORQUE.

Subject Categories : Helicopters
      Machinery and Tools
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE