Selection of optimal manufacuturing tollerance level for a RV reducer under the contrasint of transmission reliability

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (2) : 7-15.

SU Yuewen1，GUO Caixia1，WANG Canjun1，ZHU Aibin2

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Abstract

Manufacturing error is the key factor affecting the transmission accuracy of RV reducer. On the basis of the gear tooth contact analysis method, a new gear tooth contact equation for two-stage transmission of involute gear and cycloidal pin gear is constructed to evaluate the influence mechanism of various manufacturing errors on transmission error of RV reducer considering tooth profile modification, machining error and assembly error. The prediction model of transmission error for cycloid pinwheel mechanism with different manufacturing errors is obtained to calculate the the sensitivities of various manufacturing errors for the transmission error. Sensitivities are also used as the basis for the selection of tolerance levels IT5 or IT6. According to different tolerance levels, manufacturing errors are expressed as Gaussian random numbers. Furthermore the reliability of the RV reducer without interference is analyzed and the distribution of transmission errors are obtained through random sampling errors under each group of error samples. The results show that the position error of the pin and the cumulative pitch error of the cycloid gear have the greatest influence on the transmission error, the eccentricity error of involute gear and crank shaft has little influence, and the influence of the pin radius error is the least. When the machining errors with lower sensitivity are set to IT6 and the ones with higher sensitivity are IT5, the transmission error accuracy requirements when all machining errors are IT5 can be obtained, the reliability is 98%, and the machining cost is lower. It can be as the basis for the manufacturing tolerance selection and the cost control of RV reducer.

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RV reducer / manufacturing errors / transmission errors / tooth contact analysis

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SU Yuewen1，GUO Caixia1，WANG Canjun1，ZHU Aibin2. Selection of optimal manufacuturing tollerance level for a RV reducer under the contrasint of transmission reliability[J]. Journal of Vibration and Shock, 2023, 42(2): 7-15

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