Abstract
An engineering calculation model is introduced for point-contact elastohydrodynamic lubrication analysis of spiral bevel gears. This model can analyze transient lubrication characteristics of spiral bevel gears. The influence of the angle between the lubricant entrainment and the minor axis of the contact ellipse is included in this model. The contact parameters of the spiral bevel gear are calculated, which will change with time during the meshing process. The variation of lubricant film thickness during the meshing process of spiral bevel gears is unraveled. Due to the influence of entrainment velocity, the oil film thickness at the out mesh side is smaller than that at the enter mesh side under the same contact force. It is evident that the higher the pressure is, the larger the contact area will be. Meanwhile, the thickness of the oil film is reduced, and the oil film distribution in the contact area is relatively uniform. Taking helicopter main transmission spiral bevel gears as an example, this study finally calculates the distribution characteristics of the oil film thickness of the spiral bevel gear, and solves the lubrication performance of the spiral bevel gear under different working conditions.
Highlights
An engineering calculation model is introduced for point-contact elastohydrodynamic lubrication analysis of spiral bevel gears
Based on the numerical calculation method of the circular contact elastohydrodynamic lubrication (EHL) model provided by V enner[34], the coordinate transformation method is used in the oil film distribution equation, and the angle between the entraining velocity and the minor axis of Hertzian ellipse is considered
An engineering calculation model is introduced for point-contact EHL analysis of spiral bevel gears
Summary
The variation of the thickness and pressure of the lubricating oil film during the meshing of the spiral bevel gear is analyzed, and the effects of different working conditions and surface parameters on oil film thickness are calculated. Masjedi et al.[31,32] performed a large number of numerical calculations and fitted the calculation results into a mixed lubrication empirical formula suitable for engineering applications Based on these studies, expressions are derived to predict the central and minimum film thickness. In the EHL analysis of the tooth surface of the spiral bevel gear, the entrainment velocity of the meshing point is inconsistent with the minor-axis of the contact ellipse, and there is an included angle θ (Fig. 1)
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