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  • 12月 18, 2020
  • News

Today’s machining accessories planetary gearbox products are becoming more and more competitive. Noise is one of the main performance indicators of planetary gearboxes. We must explore the causes of planetary gearbox noise sources in terms of the design and maintenance of gearboxes.
The influence of gear parameters and structural design on noise; The greater the overlap, the less noise; In other words, the more teeth pairs involved in meshing, the smoother the gear drive. Therefore, noise reduction and improved carrying capacity are of great significance.
Gear accuracy level is an important symbol of noise level, for standard series gear reducers, the noise value of gear is determined by the manufacturing accuracy of gear. The higher the flank accuracy, the denser the contact marks on the meshed flank, and the less noise there is on the entire flank. In contrast, the lower the gear accuracy, the smaller the contact marks on its meshing flanks, and when the contact width is not fully engaged, the operation is not smooth, and even has an impact. Increase the value of noise.
The impact and noise generated by the pitting of the flanks, and after a certain period of time on the carrier wheel, the transmission gear often appears small pieces of metal fall off near the flank joints, forming a hemp point, i.e. pitting. Because the hard-toothed gear has the advantages of large carrying capacity, small size, light weight and good transmission performance. Although hard wheel is not easy to corrode, it is widely used. But it’s not easy to run after pitting. The pitting of the tooth surface increases rapidly as the working time increases. Evolution into diffuse corrosion causes mutual damage between teeth, increasing working noise and shock. At the same time, the metal debris falling after impact will also accelerate the wear of the flanks, making the gear transmission uneven and making noise.
Noise caused by gear processing error: The noise caused by gear processing error is mainly caused by the accumulation of pitch and profile error. The uneven thickness of the teeth is caused by the non-fit of the blank swing shaft when the teeth are made and the swing shaft when the gears are working. The profile error of the roller is mainly due to the error in manufacture, blade grinding and installation of the roller, resulting in the tooth prism, profile asymmetry, root cutting and subsequent processing correction, resulting in uneven transmission. Pulsation, root cutting, and teething are produced, resulting in noise.
Noise caused by the inner ring gear and planetary frame processing error, and radial run-out error has the greatest effect on the floating amount of floating parts. Therefore, the radial run-out of the inner ring gear should be strictly controlled. Damage to the inner ring gear due to improper selection of the machining and heat treatment process. In the heat treatment process, the change of the parameters such as profile, lead orientation and pitch is also one of the important reasons for noise. In the process of processing the planetary wheel frame, the position deviation of the planetary axle directly affects the side gap of the gear sub. The necessary side gaps are important to ensure that the gearbox is operating normally, lubricating, thermal expansion and cold shrinkage are not blocked, but the side gaps pass through the assembly to produce shock and noise during positive and reverse conversions.
In heavy-duty gear transmission, the elastic variant of the flank causes noise, and the heavy-duty gear, especially the hard-flank gear, has great elastic deformation and poor running performance, and the gear is engaged in meshing shock caused by load deformation, which produces noise. The assembly error causes noise, and the geometric accuracy of the assembly is not up to the design requirements. Noise caused by vibration of the drive system, or by loose individual parts during assembly. This caused the system to be incorrectly located. Engage in an abnormal position. The motion of the shaft system produces vibration and noise.
Improper maintenance of the whole machine causes noise and wear on the flanks when the gears are engaged. In the long-term use of the process, if lubrication, cooling is not sufficient, poor oil cleaning, will accelerate wear. In severe wear, the accuracy of the gears decreases. The deceleration opportunity produces noise.
In short, tell you that the noise source of the planetary gearbox is related to the design, manufacture, installation accuracy and maintenance of the whole machine, in an attempt to improve transmission smoothness and reduce noise.

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