Accession Number : ADA290187

Title :   Computerized Design and Generation of Low-Noise Helical Gears with Modified Surface Topology.

Descriptive Note : Technical memo.,

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

Personal Author(s) : Litvin, F. L. ; Chen, N. X. ; Lu, J. ; Handschuh, R. F.

PDF Url : ADA290187

Report Date : AUG 1994

Pagination or Media Count : 33

Abstract : An approach for design and generation of low-noise helical gears with localized bearing contact is proposed. The approach is applied to double circular arc helical gears and modified involute helical gears. The reduction of noise and vibration is achieved by application of a predesigned parabolic function of transmission errors that is able to absorb a discontinuous linear function of transmission errors caused by misalignment. The localization of the bearing contact is achieved by the mismatch of pinion-gear tooth surfaces. Computerized simulation of meshing and contact of the designed gears demonstrated that the proposed approach will produce a pair of gears that has a parabolic transmission error function even when misalignment is present. Numerical examples for illustration of the developed approach are given.

Descriptors :   *COMPUTER AIDED DESIGN, *GEARS, *MACHINERY NOISE, *LOW NOISE, COMPUTERIZED SIMULATION, VIBRATION, SHAPE, TRANSMITTANCE, SURFACES, TOPOLOGY, LINEARITY, PARABOLAS, NOISE REDUCTION, MISALIGNMENT, FUNCTIONS(MATHEMATICS), HELIXES, TRANSMISSIONS(MECHANICAL).

Subject Categories : Acoustics
      Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE