Design Methods And FEM Analysis Of Beveloid Gears With Crossed Axis

Beveloid gear transmission with crossed axes is a special involute gear transmission, which have a small angle between axes of active and passive gear. It is applied extensively in the drive train system of ships such as cruises, etc. This kind of gears’design process is very complex because there are many geometric parameters, and the intension cannot be calculated by the current formulas of involute cylindrical gears. Therefore, a design method for beveloid gear with crossed axes is introduced and finite element method is presented to analysis the bending stress and contact stress of a pair of beveloid gears with crossed axes.First of all, the theory of engagement and main geometric parameters of beveloid gear with crossed axes is introduced briefly, the method which must ensure the installation parameters and apply to any transmission layout form is educed in great detail. This method has advantages compared with traditional method. Two pairs of beveloid gears with crossed axes is designed base on the method and one pair of them as research object of this paper.In the second place, the paper uses the principle of coordinate transformation to build the mathematical model of beveloid gear tooth surface based on the meshing relationship between beveloid gear and its imaginary rack. The spatial points of beveloid gear is calculated according to the mathematical model. The tooth surface is generated through the spatial points, and then3D solid model is generated with Pro/Engineering and provided to the FEM.In the last place, the3D solid model is imported into ANSYS software and establish FEM model of beveloid gear. We can get the maximum value and position of contact stress and bending stress of this gear pair from the finite element analysis results. The results can be used to direct the optimal design of gears.