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Design, Generation, Stress Analyhsis and Test of Low-Noise, Increased Strength Face-Milled Spiral Bevel Gears
97FTM15
A modified geometry of face-milled spiral bevel gears with uniform and tapered teeth that provides a localized bearing contact, reduces the level of noise and increases the strength of the teeth has been developed. The modified geometry is based on application of specially developed machine-tool settings and the generation of the gears is accomplished by application of the commercially available equipment and tools. The main ideas proposed are the followings: (1) The optimization of the geometry is based on the local synthesis of the gear tooth surfaces that provides: (i) a localized bearing contact in the longitudinal and across the surface directions, (ii) a reduced level of transmission errors of a parabolic type, and (iii) the desired magnitude of the major axis of the instantaneous contact ellipse. The optimization is achieved by the mismatch of the surfaces of the generating tools. (2) The increase in tooth strength is due to the inherent increase in the total tooth contact ratio produced by the optimized geometry. The stress analysis is based on solid modeling of the tooth and finite element analysis. (3) The theory developed was tested by a Tooth Contact Analysis (TCA) computer program. Prototypes of the gears with tapered teeth were manufactured and vibration, noise and stresses have been measured experimentally. In comparison with the existing design, the level of noise was reduced by up to 18 decibels, at the spiral bevel meshing frequencies, and the vibration levels were reduced by 50%. The total stress level for the gear set was reduced enough to permit an increase in the maximum operating torque level.
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