Relatively speaking, the bending strength is relatively abundant. Therefore, the modulus m which plays a major role in bending fatigue strength can be made smaller (for power gear transmission, m2mm). When the diameter of the index circle is constant, the number of teeth of the gear can be made larger, which increases the coincidence degree and improves the smoothness of the gear transmission. It is advantageous to reduce the tooth height and the cogging size, thereby reducing the size and processing amount of the blank, increasing the service life of the tool and reducing the cost. Normally, the number of teeth of the closed-type soft-toothed gear transmission can be taken as: z1=2040.
The generation of multiple alternatives can be implemented by enumeration using a computer program. The alternatives are defined as follows.
The definition of the conventional design steps of the closed soft toothed gear: The selection of one gear design is a set of parameters that satisfy the following conditions: 1 the number of teeth of the small gear is an integer satisfying z1=2040; the number of teeth of the small gear is satisfying z2=uz1 ( An integer of -1,0, 1), where: u is the gear ratio, (-1,0, 1) means that -1,0,1 can be taken; the pinion index circle diameter d1dmin, where: Dmin is the minimum required diameter determined by the preliminary design; the modulus is the standard value, and m2mm (for the power gear transmission); the center distance is an integer; the gear ratio u (or transmission ratio i) relative error absolute value is not greater than 5.
The evaluation criteria of the program are the main basis for the selection of the program. A comprehensive quantitative assessment of the program can be made from the following aspects. The value is determined by considering the degree of emphasis on the performance of various aspects of the gear during actual use and balancing the magnitude difference of each evaluation amount. Obviously, the larger the Cop value, the better the solution.
Conclusion In view of the shortcomings of the conventional gear bearing capacity design process, there is usually only one solution. This paper proposes a multi-scheme design and evaluation method in the conventional design of gears. Compared with the modern optimization design method, the model, process and calculation are much simpler and can obtain better feasible solutions.
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