IKO one-way bearing fit and load type relationship

When choosing a fit, first consider the type of load the ferrule is subjected to. Usually the types of ferrules subjected to loads are as follows:

1 fixed load

The resultant radial load acting on the ferrule is carried by the local area of ​​the ferrule raceway and transmitted to the opposite area of ​​the shaft or IKO one-way bearing housing. This load is called a fixed load. The fixed load is characterized by a synthetic radial load vector that is relatively stationary with the ferrule. The ferrule and the synthetic radial load do not rotate or rotate at the same speed are fixed loads. A looser fit can be used for the ferrules that are subjected to a fixed load.

2 rotating load

The resultant radial load acting on the ferrule rotates in the circumferential direction of the raceway and is sequentially carried by various parts. This load is called a rotational load.

The rotational load is characterized by a synthetic radial load vector that rotates relative to the ferrule. There are three cases of rotating loads:

(1) The load direction is fixed and the ferrule is rotated;

(2) The load vector rotates and the ferrule is stationary;

(3) The load vector and the ferrule rotate at different speeds.

3 swing load and variable load

Sometimes the direction and size of the load cannot be accurately determined. For example, in a high-speed rotating machine, in addition to the load bearing the fixed weight of the rotor, there is also a rotating load caused by the unbalanced mass, if the rotating load is more than the fixed load. Larger, the resultant load is still a rotating load; and if the rotating load is much smaller than the fixed load, the resultant load is the oscillating load. Both the rotational and oscillating loads are constantly changing in size and direction. In the variable working state, some of the ferrules may be loaded with a load, but a fixed load, and a swing load. This type of load is called an indefinite load.

The oscillating load and the indefinite load should be treated in the same way as the rotating load. The loose fit will cause the mating surface to be damaged.

A transition fit or an interference fit should be selected for the ferrule and shaft or seat bore that rotates relative to the direction of the load. When the interference size is IKO one-way bearing under load, the ferrule does not produce “creeping” on the mating surface of the shaft or the seat hole. When the load is very light, or the ferrule is occasionally rotated at a low speed under heavy load, a transition fit may be used, and the shaft surface should have a higher hardness and a smaller surface roughness.

For heavy loads, it is usually better than the combination of light and normal loads. The heavier the load, the greater the fit should be.

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Regular maintenance of IKO outer spherical bearing equipment

When inspecting the IKO bearing equipment for regular inspection, operation, and removal of the outer spherical bearing when the peripheral parts are replaced, it is necessary to judge whether the bearing parts can be reused or not, and whether the use condition is good or bad. Also carefully investigate and record the removed bearings and appearance. In order to clarify and investigate the remaining amount of lubricant, the bearings should be cleaned well after sampling. If the bearing is found to be damaged or abnormal, please find out the cause according to the phenomenon of bearing damage and formulate countermeasures. In addition, the inspection results, if there are the following defects, the outer spherical bearing can no longer be used, need to replace the new bearing.

The actual life that can be achieved before the bearing is damaged is caused by the wear and damage of the IKO bearing, which is usually not caused by fatigue, but by wear bearings, erosion, seal damage and other reasons. However, whether in laboratory tests or in actual use, it can be clearly seen that under the same working conditions, the outer spherical bearing has the same appearance. In general, one-third of the bearing damage is caused by fatigue damage. Another third of the bearings are due to poor lubrication, and the other third is due to contaminants entering the bearing or improperly installed.

Improve the rotation accuracy of the bearing and reduce the vibration and noise of the IKO bearing. Tests have confirmed that the improvement of the rotation accuracy of the outer spherical bearing, the vibration and the noise reduction are all related to the significant reduction of the circular deviation of the ferrule. This creates good conditions for improving the bearing capacity of the complete bearing. In addition, bearing-to-rolling bearings can improve the bearing capacity of bearings if they are super-finished in addition to the crown. Super-precision greatly improves the working performance and service life of the bearing. Because of the many functions and effects, the super-fine finishing is more and more favored by the finishing of the bearing ring.

Cleaning of the bearing: When disassembling the outer spherical bearing for inspection, first record the appearance of the bearing, confirm the residual amount of the lubricant, and after sampling the lubricant for inspection, wash the IKO bearing. As a cleaning agent, gasoline and kerosene are commonly used. Bearing inspection and judgment: In order to judge whether the removed bearing can be used, it should be checked after the bearing is cleaned. Check the raceway surface, the rolling surface, the state of the mating surface, the wear of the cage, the increase of the bearing clearance, and the damage and abnormality that are irrelevant in dimensional accuracy. Purpose of bearing lubrication: The purpose of lubrication of rolling bearings is to reduce the internal friction and wear of the bearings and prevent burnt sticking.

It is hoped that the shaft lubrication will be opened before the installation, and the grease will be directly filled without cleaning. The lubricating oil is lubricated and does not need to be cleaned normally. However, for instrument or high-speed IKO bearings, it should be cleaned with clean oil to remove the rust inhibitor applied to the outer spherical bearing.

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