Through the above contact characteristic control methods and contact area analysis methods, we can easily obtain the desired contact area shape. However, there is no consensus in the industry on the design method of ideal contact area shape.
There are many transmission performance indexes of spiral bevel gear. Considering the wide application of spiral bevel gear in automobile axle, the most prominent problem is vibration and noise. In the optimal design of the contact area, we focus on the relationship between the shape of the contact area and meshing vibration and noise. In the process of spiral bevel gear transmission, the internal excitation of the gear will be caused by the change of the number of meshing teeth, the load deformation of the gear and the manufacturing error of the tooth surface, resulting in vibration and noise. The internal excitation generated in the meshing process of spiral bevel gear is an important index to evaluate its dynamic meshing performance.
Therefore, in order to control the vibration and noise of spiral bevel gear, the internal excitation in the meshing process of spiral bevel gear should be reduced from the source. When the basic parameters of the spiral bevel gear pair are the same, the different position and shape of the meshing mark will inevitably lead to the difference of the internal excitation of the spiral bevel gear. Therefore, the influence of the meshing mark difference on the internal excitation of the gear should be carefully analyzed and considered in the design process of the spiral bevel gear. The internal excitation of spiral bevel gear meshing mainly includes three forms: meshing stiffness excitation, error excitation and meshing impact excitation. The error excitation mainly considers the influence of spiral bevel gear machining and installation errors on the meshing vibration and noise of spiral bevel gear. Therefore, the internal excitation under the theoretical meshing impression difference of spiral bevel gear itself is analyzed, and the error excitation is not considered.
Due to the complexity of the tooth surface structure of spiral bevel gear, it is difficult to quantitatively analyze the internal excitation in the meshing contact transmission process by using the theoretical analysis method. The contact finite element method is usually used.