This paper describes the work performed to reduce 1st order gear mesh vibration which was the root cause of an excessive gear "whine". It includes a discussion for introduction of an unmodified involute profile (except for a short tip relief to smooth the tooth entry and exit into the mesh), inspection charts, significance of a statistical sample size for validation, vibration measurements, and correlation of tooth profiles to vibration results. While many articles on gear noise reduction focus on introducing profile modifications, this paper describes one helical gear application where an improvement was achieved by the elimination of profile modification.
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