The Visual Contact Analysis And Control Of Spiral Bevel Gearing

Spiral bevel gear, hypoid bevel gear(shorted spiral bevel gear) are mainly used for transmitting motion and power between two intersecting axes of the space. It is widely used in the power transmissions structure of automobile, aircraft, heavy machinery and other machines, because of strong bearing capacity, smooth transmission, low noise, long life, compact construction and high reliability.The transmission quality, service life and vibration noise of spiral bevel gear was mainly measured by the shape, position, size of contact area(contact patch) in the process of transmission, because of the complexity of the tooth surface shape and the particularity of cutting method. Installation error and tooth error are main factors that affect the contact area of spiral bevel gear. There are always many kinds of errors during installation including shaft angle error, the axis spacing error, locating distance error. Besides, there is also a tooth error that lies in the cutting process and the heat treatment deformation, so the real tooth will be different from theoretical one, the real tooth contact condition can’t be shown effectively by theoretical tooth contact analysis. Therefore, it is meaningful to study a more accurate and more reasonable contact analysis method of real tooth. On the other hand, installation error, tooth errors and some other factors have affected the shape of contact area. It is necessary to study the installation position to optimize contact area.This paper is mainly about a research of “real” tooth that uses space meshing theory, numerical analysis, topology, and computer graphics. Firstly, based on "basic machine model", the numerical optimization methods is used for reversing real tooth after acquired real spiral bevel gear tooth digital characteristics. Then, reverse tooth is calculated by a set of theoretical tooth machining adjustment parameters and machine tool parameters. Real tooth is replaced by the reverse one. Furthermore, spiral bevel gear visualize three-dimensional model is built that based on OCC. Two methods is studied for the theoretical tooth contact analysis, one apply the traditional meshing theoretical and other one apply surface intersection; The deviation of installation position is optimized for controlling contact area; Two kinds of 3D and 2D visualization methods is used for human-computer interaction. Finally, “real” tooth contact analysis software is written that based on OCC in Microsoft VC ++. The result is tested by the experiment which is done on the YK9560 integrated CNC spiral bevel gear rolling inspection machine.