Transmission error analysis of helical gears for any load condition (practical calculation program for windows PC and application)

摘要

Recently, the gear noise reduction of car transmission, especially for light load condition, is of increasing importance due to the unsparing needs of silence. Since the transmission error is the exciting source of gear noise, the purpose of this study, is to establish an effective method to analyze the transmission error of helical gears with any 3-D tooth surface cutting error for any load condition including light load. The shaft misalignment due to the assembly errors, and the variable shaft deflection caused by the transmitted torque, are also considered. This paper introduces an exact transmission error analysis method of helical gears, in consideration of the nonlinear tooth separation phenomenon at light load condition. As a result, a practical program for Windows personal computer to calculate the transmission error, is also developed. By using this program, the gear designer can find the optimum shape of tooth surface, and the gear producer can evaluate the quality of his manufactured gears. For confirming the proposed analysis method and the calculation program, the tooth contact pattern of several gear pairs are measured and compared with the calculated result. Especially, it is clarified that the transmission performance of the helicoid bias-in tooth surface modification is better than that of the helicoid bias-out tooth surface modification.