Spiral bevel gear is a kind of space gear widely used in various high-speed and heavy-duty intersecting shaft and staggered shaft transmission, especially in aircraft, ships, precision machine tools, construction machinery, vehicle transmission and other industries. Therefore, the design and manufacture of spiral bevel gear has occupied a very important position in the machinery industry. When the spiral bevel gear is meshed correctly, the big wheel and the small wheel should have the same pressure angle, but also the same spiral angle with the same size and opposite direction. In the transmission process of spiral bevel gear, only the spiral angle at the meshing part in the middle of the gear is the designed standard spiral angle, while it is approximate in other parts. Strictly speaking, the most reasonable meshing can not be guaranteed in principle.
Although the research on spiral bevel gear at home and abroad has made remarkable achievements, it has not fundamentally solved the problems caused by the unequal spiral angle in the direction of tooth direction and line. It is only based on tooth shape correction, tooth surface grinding and cutter head adjustment to reduce noise, improve contact area and improve stability. Therefore, it is very important to solve the problem of unequal helix angle at different meshing points in spiral bevel gear transmission. As a new type of gear transmission, logarithmic spiral bevel gear has more advantages than traditional spiral bevel gear. The logarithmic spiral bevel gear ensures the meshing transmission with equal spiral angle and improves the transmission accuracy and stability of the transmission spiral bevel gear in the transmission process. Logarithmic spiral bevel gear, its meshing and transmission principle, parameter design method and processing technology are analyzed and studied, a relatively complete theoretical system is also established, and the solid parts of logarithmic spiral bevel gear are successfully processed.
Due to the complex surface shape of logarithmic spiral bevel gear, its machining process is more difficult than that of general bevel gear. The logarithmic spiral bevel gear processed according to the generation method should first adjust the processing parameters of the machine tool according to the generation principle to process the large wheel, and then cut the small wheel according to the conjugate principle of spiral bevel gear. In this way, there is a certain machining error between the actually machined logarithmic spiral bevel gear tooth surface and the theoretical tooth surface, that is, the tooth surface deviation. The actual meshing point of the tooth surface deviates from the theoretical meshing point, and the meshing characteristics of the actually machined gear pair deviate from the requirements of the theoretical design, which affects the actual meshing transmission of the spiral bevel gear, and the ideal gear pair can be obtained only by trial cutting for many times. In order to reduce the tooth surface deviation, the most economical and applicable method is to use the laser scanning equipment to collect the discrete data points of the tooth surface, so as to obtain the normal deviation of the mesh points of the tooth surface, and obtain the correction amount of the machine tool adjustment parameters through numerical analysis, so as to obtain the best machine tool adjustment parameters.