Rolling bearing type selection and load capacity analysis

1. Main factors for selecting rolling bearing types
Bearing load: Bearing load is one of the most important considerations when selecting bearing types. The size, direction and nature of the load will directly affect the life and performance of the bearing. Ball bearings are usually suitable for light, medium and relatively stable loads, while roller bearings are more suitable for heavy loads and large impact loads due to their larger contact area and higher load-bearing capacity. When selecting bearings, it is necessary to comprehensively consider factors such as bearing load capacity, wear resistance and stability according to the load conditions in actual working conditions to select the most suitable bearing type.
Speed: Speed ​​is also one of the factors that need to be considered when selecting bearing types. When the speed is high, the bearing needs to withstand greater centrifugal force and friction, so bearings with the same inner diameter and smaller outer diameter should be selected to reduce friction and wear. In addition, high-speed bearings also need to consider their self-aligning performance and lubrication method to ensure the stability and reliability of the bearing.
Precision and rigidity: The precision and rigidity of the bearing have an important impact on its performance and service life. High-precision bearings have low friction, low vibration and low noise during operation, which can improve the precision and stability of mechanical equipment. Bearings with good rigidity can withstand greater deformation and impact, improving the load-bearing capacity and safety of mechanical equipment. When selecting bearings, it is necessary to select suitable bearing types and precision grades according to the accuracy and rigidity requirements of mechanical equipment.
Axial movement and installation space: When selecting bearings, factors of axial movement and installation space need to be considered. When the bearing needs to be able to move and displace along the axial direction, a cylindrical roller bearing with no flange on the inner ring or outer ring can be selected. When the radial or axial dimensions of the installation part are limited, it is necessary to select bearings of corresponding sizes to ensure that the bearing can be installed smoothly and work normally.

2. Load-bearing capacity analysis
Rated dynamic load and rated static load: The load-bearing capacity of rolling bearings refers to the expected life and maximum static load capacity of the bearing that can work normally under specific conditions. Rated dynamic load and rated static load are important indicators for evaluating the bearing load-bearing capacity. Rated dynamic load refers to the expected life of the bearing that can work normally under certain speed and load conditions. Rated static load refers to the maximum load that the bearing can withstand in a stationary state. When selecting bearings, it is necessary to select bearings with sufficient load-bearing capacity according to the load conditions in actual working conditions.
Fatigue limit: The expected life of a rolling bearing that can work normally under cyclic load, also known as fatigue life. Fatigue limit is an important indicator for evaluating the fatigue performance of bearings. When the cyclic load on the bearing exceeds its fatigue limit, the bearing will suffer fatigue damage, resulting in failure of the mechanical equipment. Therefore, when selecting bearings, it is necessary to comprehensively consider the fatigue limit of the bearing and the cyclic load conditions in actual working conditions to ensure that the bearing has sufficient fatigue life.
Bearing type and size: Different types of rolling bearings have different load-bearing capacities. For example, the axial load-bearing capacity of angular contact ball bearings increases with the increase of the nominal contact angle, while tapered roller bearings have greater radial and axial load-bearing capacity due to their special structure. In addition, the size of the bearing also directly affects its load-bearing capacity. Large-diameter bearings can usually withstand greater loads, but they will also increase the weight and cost of mechanical equipment. Therefore, when selecting bearings, it is necessary to select suitable bearing types and sizes based on the load conditions in actual working conditions and the requirements of mechanical equipment.
Bearing accuracy and clearance: The accuracy and clearance of the bearing also have a certain impact on its load-bearing capacity. High-precision bearings have low friction, low vibration, and low noise during operation, which can improve the accuracy and stability of mechanical equipment. The appropriate clearance can ensure the flexibility and reliability of the bearing during operation. When selecting bearings, it is necessary to select the appropriate bearing accuracy grade and clearance range according to the accuracy and stability requirements of the mechanical equipment. At the same time, it is also necessary to pay attention to the installation and commissioning process of the bearing to ensure that the accuracy and clearance of the bearing meet the design requirements.

Sealed Needle Roller Bearings

It is a supporting roller bearing with a rear wall outer ring, and the roller can roll directly on the raceway and can withstand large loads. The outer surface of the outer ring of the roller is cylindrical. The two ends are sealed, and the outer ring, needle roller cage assembly, and sealing ring form a complete unit. Synthetic rubber seals are selected on both sides to ensure long-term lubrication, prolong the service life of the product, and improve work efficiency.