A modified geometry of face-milled spiral bevel gears withuniform and tapered teeth that provides a localized bearingcontact, reduces the level of noise and increases the strength ofthe teeth has been developed. The modified geometry is based onapplication of specially developed machine-tool settings and thegeneration of the gears is accomplished by application of thecommercially available equipment and tools.
The main ideas proposed are the followings:
(1) The optimization of the geometry is based on the localsynthesis of the gear tooth surfaces that provides: (i) a localizedbearing contact in the longitudinal and across the surfacedirections, (ii) a reduced level of transmission errors of aparabolic type, and (iii) the desired magnitude of the major axisof the instantaneous contact ellipse. The optimization is achievedby the mismatch of the surfaces of the generating tools.
(2) The increase in tooth strength is due to the inherentincrease in the total tooth contact ratio produced by the optimizedgeometry. The stress analysis is based on solid modeling of thetooth and finite element analysis.
(3) The theory developed was tested by a Tooth Contact Analysis(TCA) computer program. Prototypes of the gears with tapered teethwere manufactured and vibration, noise and stresses have beenmeasured experimentally. In comparison with the existing design,the level of noise was reduced by up to 18 decibels, at the spiralbevel meshing frequencies, and the vibration levels were reduced by50%. The total stress level for the gear set was reduced enough topermit an increase in the maximum operating torque level.
- Edition:
- 97
- Published:
- 11/01/1997
- Number of Pages:
- 17
- File Size:
- 1 file , 880 KB
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