各歯の精度のばらつきを考慮した歯車振動設計

概要

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As the acoustic power of noise radiated from gear transmission is far smaller, by ten to hundred thousands times, than the transmitting power of the gearing, even a deviation of tooth flank shape in several micrometers already has a very big influence on the running noise of the transmission. Gears are in general manufactured under the tolerance limit specified by designers, but the detail of geometrical shape of each tooth flank is not the same. In addition to this, the alignment of gear shafts in operation is changed by clearance of the bearings and elastic deformation of the system. The scattering in the shape of tooth flanks and the change of the alignment give a considerable influence on the nature of vibration excitation caused by tooth meshing. In practice the detail of the figure of each tooth flank of a gear is not usually same and the exact status of gear shaft alignment is not known. These make the prediction of gear noise extremely difficult. This paper proposes a method of data analysis for vibration excitation due to tooth meshing of gears for predicting running noise of gears. This method brings a good correlation between the calculated vibration excitation and gear noise of an automatic transmission of a passengers car. Basing on this method, a procedure to design silent gears, considering manufacturing capability of the work, is proposed.
一般社団法人日本機械学会の論文
1991-12-25