Some solutions to reducing noise of gear reducer

With the sustainable development of the economy and the globalization of the economy, people have increasingly high requirements for the performance of gear reducers. The noise of gear reducers has become an important comprehensive quality control link. The noise control level of gear reducers not only reflects the comprehensive strength of a manufacturing enterprise, but also is directly constrained by relevant environmental regulations. Therefore, how to reduce the noise of gear reducers has always been a hot issue that people are committed to solving.

There are many methods to reduce the noise of gear reducers. Based on the known factors that cause noise in gear reducers, it can be roughly analyzed and discussed from several aspects such as design, manufacturing, installation, and maintenance.

design

Selection of raw materials

The materials used for gears mainly include steel, cast iron, copper alloys, and non-metallic materials. On the premise of meeting the strength requirements, non-metallic materials can be considered for use. With the development of science and technology, the strength of non-metallic materials has greatly improved, and their use can reduce the noise of gear transmission.

In terms of material selection, cast iron has the characteristics of better machinability, high wear resistance, good vibration damping, low noise, and low cost compared to steel, but its strength must be considered to meet the usage requirements. In steel materials, using high-quality low-carbon alloy steel can reduce noise and vibration, but when pairing and combining, it is important to note that the working tooth surface hardness of the small gear is slightly higher than that of the large gear. Under the condition of meeting the strength requirements, it is possible to consider using different materials of gears of different sizes to mesh together, which can also achieve the purpose of noise reduction.

Selection of gear parameters

1) On the premise of meeting the bending fatigue strength, when the center distance is constant, a larger number of teeth should be selected, which can improve the overlap, make the transmission stable, and reduce noise.

On the premise of meeting the transmission requirements, the number of teeth of the large and small gears should be made as prime as possible to disperse and eliminate the impact of gear manufacturing errors on the transmission, and to avoid periodic meshing of certain teeth on the large and small gears, thus making the transmission stable and reducing noise.

2) Adopting a smaller pressure angle can reduce operating noise. Taking into account the impact of strength, the standard value of $%&is usually taken. When the structure allows, priority should be given to using helical gears, which have a significant reduction in vibration and noise compared to spur gears. The general requirement is to select a helix angle between 8 and 20.

3) Under the affordability of users, the accuracy level of gears should be improved as much as possible during design. High precision grade gears generate much less noise than low precision grade gears.

In order to reduce the noise of gear reducers, when selecting backlash, if the transmission is pulsating rotation, a smaller backlash should be selected. For a more balanced load, a slightly larger backlash should be selected.

Selection of tooth structure

1) Under the conditions allowed by the overall structure and design specifications, appropriately increase the tooth width. This can reduce the unit load of the gear, reduce the deformation of the gear, and thus reduce transmission noise.

2) When designing gears, solid structures should be avoided as much as possible and should be designed as web plate structures. Under the condition of meeting the strength, the weight of the gear should be minimized as much as possible. This can reduce the natural frequency of the gear from。