Why is there noise in planetary deceleration opportunities
Why is there noise in planetary deceleration? What is the solution? Traditionally, the three main factors that measure the performance of a gearbox are the load-bearing capacity and operating accuracy of fatigue life, but these factors often overlook transmission noise. The competition for reducer products in the modern mechanical processing industry is becoming increasingly fierce. Noise is an important performance indicator for the quality of planetary reducer products. Let's take a look at its solution.
(1) The influence of the parameters and structural design of the core components of the planetary reducer gear on noise; When a pair of gears is driven. The greater their overlap, the lower the noise generated. Of course, the smaller the overlap, the higher the noise. This means that the number of teeth simultaneously engaged by gears increases, which is of great significance for improving the stability of gear transmission, reducing noise, and improving load-bearing capacity.
(2) Gear accuracy level is an important indicator of noise level; For standard series planetary reducers, the manufacturing accuracy of the gears determines their noise level. The higher the gear accuracy, the denser the contact marks on the meshing tooth surface, and the denser the contact marks on the entire tooth surface, resulting in lower noise. On the contrary, the lower the gear accuracy, the smaller the contact marks on its meshing tooth surface, and the gear cannot fully mesh within its contact width, resulting in unstable operation, even impact, and increased noise levels.
(3) Impact and noise generated by tooth surface pitting; After running the transmission gear under load for a period of time, small pieces of metal often fall off near the pitch line of the tooth surface, causing pitting corrosion. The hard tooth surface gears of planetary reducers have the advantages of large load-bearing capacity, small volume, light weight, and good transmission quality. It is widely used, although hard faced gears are not prone to pitting. But once pitting occurs, it is difficult to break in. As the working time increases, the pitting on the tooth surface will rapidly expand. Developing into expansion pitting corrosion. The tooth profiles are mutually damaged, increasing work noise and impact. But the metal debris falling from the impact accelerates the wear of the tooth surface, making the transmission of the gear unstable and producing noise.
(4) Gear machining errors are prone to generating noise; The noise caused by gear machining errors is mainly caused by accumulated pitch error and tooth profile error. The cumulative error of tooth pitch is due to the non coincidence of the rotation axis of the tooth blank and the gear during gear manufacturing, resulting in uneven tooth thickness of the gear. Tooth shape errors are mainly caused by manufacturing, grinding, and installation errors of hobs, resulting in asymmetric tooth edges and profiles, insufficient undercutting, and subsequent machining corrections, resulting in unstable gear transmission. Pulsation, undercutting, and teething occur, resulting in noise.