What is Bearings

Bearing is an important part of contemporary mechanical equipment. Its main function is to support the mechanical rotating body, reduce the friction coefficientduring its movement, and ensure its rotation accuracy 

Characteristics of bearing steel

1. Contact fatigue strength

Under the action of cyclic load, the contact surface of the bearing is prone to fatigue damage, that is, cracking and peeling, which is the main damage mode of the bearing. Therefore, in order to improve the service life of the bearing, the bearing steel must have a high contact fatigue strength.

2. Wear resistance

When the bearing is working, not only rolling friction but also sliding friction will occur between the rings, rolling elements and cage, which will cause the bearing parts to wear continuously. In order to reduce the wear of bearing parts, maintain the stability of bearing precision, and extend the service life, bearing steel should have good wear resistance.

3. Hardness

Hardness is one of the important qualities of bearing quality, which has a direct impact on contact fatigue strength, wear resistance and elastic limit. The hardness of the bearing steel under the condition of use generally needs to reach HRC61~65, so that the bearing can obtain high contact fatigue strength and wear resistance.

4. Anti-rust performance

In order to prevent bearing parts and finished products from being corroded and rusted during processing, storage and use, it is required that the bearing steel should have good rust resistance.

5. Processing performance

In the production process of bearing parts, they have to go through many cold and hot processing processes. In order to meet the requirements of small quantity, high efficiency and high quality, bearing steel should have good processing performance. For example, cold and hot forming properties, machinability, hardenability, etc.

In addition to the above basic requirements, bearing steel should also meet the requirements of proper chemical composition, uniform internal structure, less non-metallic inclusions, internal surface defects conforming to standards, and surface decarburization layer not exceeding the specified concentration.

The role of bearings

In terms of its function, it should be a support, that is, it is used to support the shaft literally, but this is only part of its function. The essence of support is to be able to bear radial loads. It can also be understood that it is used to fix the shaft. Bearing quick and easy automatic selection is included. It is to fix the shaft so that it can only achieve rotation, while controlling its axial and radial movement. A motor won't work at all without bearings. Because the shaft may move in any direction, and the motor is required to only rotate when it is working. Theoretically speaking, it is impossible to achieve the function of transmission. Not only that, but the bearing will also affect the transmission. In order to reduce this influence, good lubrication must be achieved on the bearing of the high-speed shaft. Some bearings themselves have been lubricated, called pre-lubricated bearings, and Most of the bearings must have lubricating oil, which is responsible for the high-speed operation, which not only increases energy consumption due to friction, but also easily damages the bearings. It is one-sided to say that sliding friction is converted into rolling friction, because there is something called a sliding bearing.

Matters needing attention in the use of bearings

1. Improve lubrication quality, control oil pressure, temperature and flow, and strengthen oil filtration.

2. Use fuel and lubricating oil that meet the regulations.

3. To control the temperature state of the diesel generator set, it is unfavorable to work under the condition of overcooling and overheating. In cold weather, the diesel engine should be preheated before starting, and the crankshaft should be turned by hand to allow the oil to enter the friction surface.

4. The surface quality and geometry of bearings and journals should be strictly guaranteed.

5. The bearing clearance should be appropriate. If the generator set is too large, it will cause impact. If it is too small, it will cause poor lubrication and may burn tiles.

How to ensure reliable operation of bearings

Generally speaking, the following points should be paid attention to from the perspective of use:

1. The bearing clearance should be appropriate, if it is too large, it will cause impact, if it is too small, it will cause poor lubrication and may burn tiles;

2. The surface quality and geometry of bearings and journals should be strictly guaranteed;

3. Improve lubrication quality, control oil pressure, temperature and flow, and strengthen oil filtration;

4. Use compliant fuel and lubricating oil.

In order to make the bearing fully play and maintain its due performance for a long time, it is necessary to do a good job in regular maintenance (regular inspection). It is very important to improve productivity and economy to find faults early and prevent accidents before they happen through appropriate periodic inspections.

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