Gear transmission has a wide range of applications in a variety of machinery. It has many advantages compared to belt drives, chain drives, worm gear drives, etc. For example, the transmission has a wide speed range, large transmission power, reliable transmission, compact structure, long service life, and a constant instantaneous transmission ratio, but one of its disadvantages is high noise. So, how to effectively reduce the noise of the gear transmission, the author discusses as follows: First, the material of the choice of gears are generally carbon steel, forged steel, cast steel, cast iron and non-metallic materials (such as nylon, cloth plastic). In order to reduce the noise of the gear transmission, non-metallic materials may be boldly used as the material of choice for gears in some places where the strength requirements are not high. In particular, with the gradual deepening of the research and development of non-metallic materials by Chinese science and technology workers, the strength and precision of parts made of non-metallic materials will gradually increase, and it will be increasingly favored by mechanical design workers. At the same time, it is also possible in a pair of meshed gears that one gear is made of non-metallic material and the other gear is still made of metal material. Generally, non-metallic materials for pinions and metal materials for gears can reduce the noise of gear transmission. Second, when selecting gear parameters, gear parameters should be used to reduce the noise of gear transmission. When selecting the number of gear teeth, the number of teeth should be good. That is, after the center distance is determined, the modulus should be reduced as much as possible while satisfying the bending fatigue strength. Since d=mz, when the pitch circle diameter d of the gear is constant, the smaller the modulus m is, the more the number of teeth z is, and the overlap factor is increased, thereby reducing the noise of the gear transmission. At the same time, the processing costs of the gears are reduced due to the reduced module. On the other hand, when it is not possible to reduce the module of the gear, helical gears should be considered first, which can also increase the overlap factor and reduce the noise of the gear transmission. The choice of helix angle in the helical gear transmission is very demanding, because the helix angle is smaller and the advantages of helical gear transmission are not reflected. The larger the helix angle, the corresponding increase in axial force, so the general requirements The helix angle is between 8-20. In practical applications, under the condition of small transmission power, the helix angle can be slightly larger than 16 and this is more effective in reducing noise, and it can not cause large temperature rise (because the helix angle is larger, the axial direction Increasing the force will increase the useless work and generate high temperatures. Again, China's standard pressure angle for general-purpose gear transmission is α = 20, but for high-speed gear transmissions with a coefficient of convergence close to 2, it is recommended to use a gear with a gear height coefficient of 1 to 1.2 and a pressure angle of 16 to 18. Doing can increase the flexibility of gear teeth and reduce the noise of gear transmission. Third, the structural aspects of the gear should avoid the use of solid structures, but should be designed as a web structure. That is, as long as the strength meets the requirements, the gear should be as light as possible. This allows the natural frequency of the gear to be reduced, thereby reducing the meshing noise. Fourth, assembly assembly quality has a greater impact on gear transmission noise. The assembly of the left and right rotary gears that are machined from the same machine will help to reduce the meshing noise of the gears. Before assembly, special attention should be paid to cleaning the burrs of the gear end face, because the end face burrs directly generate noise during the meshing process, and if necessary, noise reduction edges can be made between the tooth profiles. 5. The running-in of the simulated work situation still fails to meet the above requirements. When the five conditions improve the accuracy of gear processing, running-in of the simulated work situation is the most effective and cheapest method. When running, apply the grinding paste to the meshing area, then rotate it forward for 10 to 20 hours, then reverse the same time. When running, care should be taken not to allow the abrasive to enter the bearing area, so as to avoid bearing wear. After running, the equipment should be cleaned, leaving no abrasive paste and grinding debris. In short, when gears are used for rotation, practical and effective methods must be adopted in the design, manufacture and installation of gears, which can reduce the noise of gear transmission. It is of great significance to improve the working environment and physical health of workers. Author: Heilongjiang College of Agricultural Economics
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