The main reasons for the noise of the gear reducer may vary. When gears work, the noise and vibration caused by the rotation of the gears are considered a big problem. However, since noise problems tend to happen due to several causes in combination, it is very difficult to identify the cause. The following ways help to reduce the noise of gear reducer.
1. Gear reducer maintenance
Many scholars regard the change of gear tooth stiffness in gear transmission as the primary factor of gear vibration and noise. Use the gear shape modification method to minimize the dynamic load and speed fluctuation to achieve the purpose of noise reduction. This approach proved to be a more useful approach in practice.
2. Technical parameter optimization
Based on years of research, it is proposed that the optimized gear parameters helps to significantly reduce the gear noise of the reducer. Parameters include the displacement coefficient, tooth height coefficient, pressure angle, center distance and biting impact velocity. For example, the meshing impact velocity will be optimized and the gear manufacturing processes will be upgraded to reduce the impact of the pitch circle, thus reducing the gear noise of the reducer.
3. Control the quality of raw materials
High-quality raw materials are the prerequisite for the production of high-quality products. 40Cr and 45 steel are used for gear production in our company. Raw materials are subject to strict chemical composition inspection and grain size measurement after they arrive at the factory.
4. Control the gear precision
The basic requirements of gear precision: Verified by practice, the gear precision must be controlled in GB10995-887~8 grade and the line speed must be higher than 20m/s gear. Its purpose is to adjust the heat treatment deformation in time to improve the quality of the tooth profile processing.
5. Loose parts
During installation, due to the looseness of individual components, the system is not positioned properly and will generate noise. Looseness also exerts an extra force on mechanical components, which compromises the lubrication film thickness, increases wear and shortens service life. Therefore, the noise reduction process should proceed from the design structure and try to stabilize the connection of various institutions.
6. Transmission parts are damaged
During the installation, the transmission parts are damaged due to improper operation, resulting in inaccurate and unstable motion. High-speed moving parts may cause vibration and noise due to oil-film vibration caused by the damage or artificial movement imbalance. These reasons must be taken care of and avoided during the installation process. Damaged parts that cannot be repaired must be replaced to offer a stable noise level.
7. Timely lubrication and proper use of oil
Unreasonable lubrication and incorrect use of grease will cause immeasurable damage to the gear unit. At high speeds, the friction of the gear tooth surface will generate a lot of heat energy. If the lubrication is improper, it will cause damage to the gear teeth, affecting the accuracy, and the noise will increase. The design requires the gear pair to have a proper clearance (backlash between the nonworking tooth surfaces of the meshing teeth to compensate for thermal deformation and storage grease). The correct use and selection of lubricating grease can make the operation of the system safe and effective, delay the deterioration trend, and stabilize the noise level.
