EHL Oil Film Thickness Analysis of VH-CATT Cylindrical Gear
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Abstract
Variable hyperbolic circular arc tooth trace ( VH-CATT ) cylindrical gear can be used in high-speed and heavy-duty occasions because of its good transmission performance and bearing capacity. In order to analyze the influence of different working conditions on the oil film thickness, the tooth surface contact mathematical model of VH-CATT cylindrical gear is constructed, and the tooth surface contact point and main curvature of VH-CATT cylindrical gear system are calculated. Based on EHL theory, the minimum oil film thickness and central oil film thickness model of VH-CATT cylindrical gear EHL are constructed, and the distribution of oil film thickness on the tooth surface of VH-CATT cylindrical gear and the variation law of minimum oil film thickness and central oil film thickness in one meshing cycle are analyzed. The results show that as the input speed increases, the entrainment speed increases, and the corresponding oil film thickness increases significantly. When the input torque becomes larger, the decreasing trend of oil film thickness is much smaller than the amplitude of torque change. This study provides a theoretical basis for predicting gear life and calculating wear.
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