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In-depth analysis of the causes of reducer noise

时间:2018-12-11 15:33   tags: products information  

        Gear reducer noise should be accurately called gear transmission noise, which refers to the noise radiated by the gear body vibration caused by mutual collision or friction when the meshing gear pair or gear set is in transmission.
  In the gear system, according to different mechanisms, noise can be divided into acceleration noise and self-sounding noise.On the one hand, when the gear teeth mesh, the gear generates a great acceleration due to the impact and will cause disturbances in the surrounding medium. The sound radiation generated by this disturbance is called the acceleration noise of the gear.On the other hand, under the action of the dynamic meshing force of the gears, the components of the system will vibrate, and the sound radiation produced by these vibrations is called self-sounding noise.
        For open gear transmission, acceleration noise is directly radiated from the impact of gear teeth, and self-sounding noise is radiated from the wheel body, transmission shaft, etc.For closed gear transmission, acceleration noise is first radiated into the air and lubricating oil in the gear box, and then radiated through the gear box.The self-humming noise is caused by the vibration of the gear body through the transmission shaft to cause the support to vibrate, and then radiates through the vibration of the gearbox box wall.Generally speaking, self-sounding noise is the main sound source of closed gear transmission.Therefore, the noise intensity of the gear system is not only related to the dynamic excitation force of the gear tooth meshing, but also related to the wheel body and the transmission shaft.The structure, dynamic characteristics, and dynamic meshing force transmission characteristics between bearings and boxes are related.
  The commonly used steels for manufacturing gear reducers are quenched and tempered steel, quenched steel, carburized and quenched steel and nitrided steel.The strength of cast steel is slightly lower than that of forged steel, and it is often used for larger gears; gray cast iron has poor mechanical properties and can be used in light-load open gear transmissions; ductile cast iron can partially replace steel to make gears; plastic gears are often used In places where light load and low noise are required, the paired gears generally use steel gears with good thermal conductivity.
  The development of gear theory and manufacturing technology will further study the mechanism of gear tooth damage, which is the basis for establishing a reliable strength calculation method, and the theoretical basis for improving the load-carrying capacity of gears and extending the life of gears; the development is represented by the arc tooth profile. New tooth profile; research on new gear materials and new technology for manufacturing gears; research on the elastic deformation of gears, manufacturing and installation errors and the distribution of temperature fields, and modify gear teeth to improve the smoothness of gear operation, and when fully loaded Increase the contact area of ​​the gear teeth, thereby improving the load-carrying capacity of the gear.Friction, lubrication theory and lubrication technology are the basic work in the research of gears. Research on the theory of elastohydrodynamic lubrication, popularize the use of synthetic lubricating oil and appropriately add extreme pressure additives to the oil, which can not only improve the bearing capacity of the tooth surface, but It can also improve transmission efficiency.