NASA LogoNTRSNTRS - NASA Technical Reports ServerSearchmore_vertCollectionsAboutNewsHelpLogin Back to ResultsInfluence of linear profile modification and loading conditions on the dynamic tooth load and stress of high contact ratio gearsA computer simulation for the dynamic response of high-contact-ratio spur gear transmissions is presented. High contact ratio gears have the potential to produce lower dynamic tooth loads and minimum root stress but they can be sensitive to tooth profile errors. The analysis presented examines various profile modifications under realistic loading conditions. The effect of these modifications on the dynamic load (force) between mating gear teeth and the dynamic root stress is presented. Since the contact stress is dependent on the dynamic load, minimizing dynamic loads will also minimize contact stresses. It is shown that the combination of profile modification and the applied load (torque) carried by a gear system has a significant influence on gear dynamics. The ideal modification at one value of applied load will not be the best solution for a different load. High-contact-ratio gears were found to require less modification than standard low-contact-ratio gears. High-contact-ratio gears are more adversely affected by excess modification than by under modification. In addition, the optimal profile modification required to minimize the dynamic load (hence the contact stress) on a gear tooth differs from the optimal modification required to minimize the dynamic root (bending) stress. Computer simulation can help find the design tradeoffs to determine the best profile modification to satisfy the conflicting constraints of minimizing both the load and root stress in gears which must operate over a range of applied loads.Document ID19900013480Acquisition SourceLegacy CDMSDocument TypeConference PaperAuthorsLee, Chinwai*(Memphis State Univ. TN., United States)*Lin, Hsiang Hsi*(Memphis State Univ. TN., United States)*Oswald, Fred B.*(NASA Lewis Research Center Cleveland, OH., United States)*Townsend, Dennis P.*(NASA Lewis Research Center Cleveland, OH, United States)*Date AcquiredSeptember 6, 2013Publication DateJanuary 1, 1990Subject CategoryMechanical EngineeringReport/Patent NumberAVSCOM-TM-90-C-004E-5384AD-A224492NASA-TM-103136NAS 1.15:103136Meeting InformationMeeting: ASME Mechanism ConferenceLocation: Chicago, ILCountry: United StatesStart Date: September 16, 1990End Date: September 19, 1990Accession Number90N22796Funding Number(s)PROJECT: RTOP 505-63-51Distribution LimitsPublicCopyrightWork of the US Gov. Public Use Permitted.Available DownloadsNameType19900013480.pdfSTIcloud_downloadcontent_copyvisibilityRelated RecordsThere are no records associated with this record.visibility_offNo Preview Available
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