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Topology of modified helical gears and Tooth Contact Analysis (TCA) programThe contents of this report covers: (1) development of optimal geometries for crowned helical gears; (2) a method for their generation; (3) tooth contact analysis (TCA) computer programs for the analysis of meshing and bearing contact of the crowned helical gears; and (4) modelling and simulation of gear shaft deflection. The developed method for synthesis was used to determine the optimal geometry for a crowned helical pinion surface and was directed to localize the bearing contact and guarantee favorable shape and a low level of transmission errors. Two new methods for generation of the crowned helical pinion surface are proposed. One is based on the application of a tool with a surface of revolution that slightly deviates from a regular cone surface. The tool can be used as a grinding wheel or as a shaver. The other is based on a crowning pinion tooth surface with predesigned transmission errors. The pinion tooth surface can be generated by a computer-controlled automatic grinding machine. The TCA program simulates the meshing and bearing contact of the misaligned gears. The transmission errors are also determined. The gear shaft deformation was modelled and investigated. It was found that the deflection of gear shafts has the same effect as gear misalignment.
Document ID
19890013549
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Litvin, Faydor L. (Illinois Univ. Chicago, IL, United States)
Zhang, Jiao (Illinois Univ. Chicago, IL, United States)
Date Acquired
September 5, 2013
Publication Date
April 1, 1989
Publication Information
Publisher: NASA
Subject Category
Mechanical Engineering
Report/Patent Number
NASA-CR-4224
NAS 1.26:4224
AD-A213170
AVSCOM-TR-89-C-002
E-4626
Accession Number
89N22920
Funding Number(s)
CONTRACT_GRANT: NAG3-655
PROJECT: RTOP 505-63-51
PROJECT: DA PROJ. 1L1-62209-A-47-A
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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