Influence of Sealing Technology of Thin Wall Bearing on Noise
Release time:
2023/01/14
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Thin-walled bearing noise is an important pollution source of the environment and an important indicator that the bearing industry needs to control. Over the past 10 years, China's bearing industry has done a lot of work in reducing bearing noise, greatly improving the level of bearing noise reduction, especially the noise limit of angular contact ball bearings for household appliances, office machinery, instruments and meters is more obvious, but there is still a certain gap compared with foreign countries, The problem highlighted by users is "noise". In other words, the bearing will make irregular sudden noises, even squeals, during its operation. The bearing noise is affected by many and complex factors. It needs to be analyzed and studied from the overall design of the bearing, the bearing components - inner ring, outer ring, cage, rolling element and lubricating oil (grease). Then, let's understand the impact of thin-walled bearing sealing technology on the noise!
The causes and prevention methods of thin wall bearing corrosion are summarized as follows.
1. Metal surface roughness (battery corrosion with poor oxygen concentration).
2. Chemical composition and structure of metal materials.
3. Composition and pH value of solution in contact with metal surface;
4. Ambient temperature and humidity.
5. Various environmental media in contact with metal surface.
6. Human perspiration is also the cause of angular contact ball bearing corrosion, and its pH value is 5~6. Therefore, in order to prevent the sweat on the hands from rusting, the installation and manufacturer should wear gloves, and do not touch the rolling bearing with hands at will.
Thin wall bearing noise reduction sealing technology:
1. Noise reduction technology:
The noise of thin-walled bearings is an important pollution source of the environment and an important indicator for the control of the bearing industry, especially the noise limit of bearings for household appliances, office machinery, instruments and meters is more obvious. In the past ten years, China's bearing industry has done a lot of work in reducing bearing noise, which has greatly improved the level of bearing noise reduction. However, compared with foreign countries, there is still a certain gap, and users report that the prominent problem is "noise". That is to say, the bearing will make irregular sudden sound, even scream during operation. The basic content of bearing noise technology is to analyze the materials used in bearing components, processing technology, and even the equipment and process materials used in the project. Because of the many and complex factors affecting bearing noise, it is necessary to analyze and study the overall design of bearing, bearing components - inner ring, outer ring, cage, rolling element and lubricating oil (grease).
2. Sealing technology
The developed thin-walled bearings are equipped with corresponding sealing devices at both ends. On the other hand, in order not to damage the bearing, protect the bearing from external dust and harmful gases entering the bearing cavity. The common ones are rubber or engineering plastic sealing rings, as well as steel plate sealing rings (or dust caps). One of their functions is to protect the grease (oil) inside the bearing from loss in use and ensure that the bearing is in a lubricating state. The sealing structure is various and the sealing effect is different. When there is a gap between the seal ring and the bearing, it is called non-contact seal. The smaller the gap, the better the sealing effect. However, when the allowable shaft speed area is small and there is no gap between the seal ring and the bearing, it is called contact seal. The larger the contact area of the contact lip of the seal ring, the better the sealing effect. The sealing technology is mainly to research and develop the corresponding sealing device used in different situations, And the compatibility of the sealing ring material with the corresponding lubricating grease. Apply anti-rust oil to prevent rolling bearing from rusting
1. Immersion method: some small rolling bearings adopt the method of immersing anti-rust grease and attaching anti-rust grease on its surface. The oil film thickness can be achieved by controlling the temperature or viscosity of the anti-rust grease.
2. Brushing method: when brushing, it shall be evenly applied on the surface of rolling bearing, and attention shall be paid to avoid accumulation and missed coating.
3. Spray method: dipping method is not suitable for oiling some large antirust substances. Solvent diluted antirust oil or thin antirust oil shall be used for spray method. Perfect fire prevention and labor protection measures shall be taken for this method. Generally, filtered compressed air with a pressure of about 0.7Mpa is used to spray to the air purification place.
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