Structure and classification of KOYO imported bearings

Due to the different working conditions of various machines, KOYO bearings have various requirements in terms of load capacity, structure and performance. The KOYO imported bearings developed on the basis of plain bearings are based on rolling friction instead of sliding friction. Generally, two ferrules, a set of rolling elements and a cage are used for versatility, standardization and serialization. A very high degree of mechanical basics. To this end, KOYO bearings need to have a variety of structures. However, the most basic structure consists of the inner ring, the outer ring, the rolling elements and the cage.

The role of various parts in the bearing is:

For a radial bearing, the inner ring is usually tightly fitted to the shaft and operates with the shaft. The outer ring is usually in a transitional fit with the bearing housing or the mechanical housing bore to provide support. However, in some cases, there is also an outer ring running, the inner ring is fixed to support or the inner ring and the outer ring are simultaneously operated. For a thrust bearing, a shaft ring that fits tightly with the shaft and moves together, and a seat ring that is in a transitional fit with the bearing housing or the mechanical housing bore and serves as a support. The rolling elements (steel balls, rollers or needles) are normally arranged in the bearing between the two ferrules by means of a cage for rolling motion. The shape, size and number of the bearings directly affect the bearing capacity and performance of the bearing. In addition to the uniform separation of the rolling elements, the cage can also function to guide the rotation of the rolling elements and improve the lubrication performance inside the bearing.

1. According to KOYO imported bearing structure type classification

(1) Bearings are classified according to their load direction or nominal contact angle:

1) Radial bearing----Mainly used for bearing KOYO bearings with radial load, the nominal contact angle is from 0 to 45. According to the nominal contact angle, it is divided into: radial contact bearing----the radial bearing with the nominal contact angle of 0: the radial angular contact bearing---the radial bearing with the nominal contact angle greater than 0 to 45.

2) Thrust bearings----Mainly used for bearing KOYO bearings with axial load, the nominal contact angle is greater than 45 to 90. According to the nominal contact angle, it is divided into: axial contact bearing----the thrust bearing with the nominal contact angle of 90: thrust angular contact bearing----the thrust bearing with the nominal contact angle greater than 45 but less than 90.

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INA imported bearings damage regular maintenance measures

Rolling bearings, if there is no choice of mistakes can be used correctly, can be used for a long time before the life of INA bearings, in this case, the damage state is peeling.

On the other hand, there are accidental early damage, and early damage that cannot be used, as the cause of the early damage, there is insufficient consideration of the use of scare lubrication, and further foreign matter intrusion, error and shaft of INA imported bearing assembly The deflection is large, and the research on the shaft and the bearing housing is not enough. It can be said that these reasons overlap with each other.

Therefore, in order to fully understand the machine used in the bearing, the conditions of use, and the structure of the outer ring of the INA bearing, if the situation before and after the accident can be clarified, combined with the damage of the bearing and various reasons, it can be prevented. The same kind of accident happened again.

The equipment is inspected regularly, the operation inspection and the bearings removed during the replacement of the peripheral parts are inspected, and the second time is judged whether it can be used again or the use condition is better or worse. The bearings and appearance of the INA bearings that have been removed should be carefully investigated and recorded. In order to clarify and investigate the remaining amount of lubricant, the bearings should be cleaned well after sampling.

Next, check the condition of the raceway surface, the rolling surface and the mating surface, and the wear state of the cage, etc., for damage and abnormality.

Judging whether INA imported bearings can be used again, it is necessary to consider the degree of bearing damage, machine performance, importance, operating conditions, inspection cycle, etc. If the bearing is found to be damaged or abnormal, the contents of the injury section will be identified and the countermeasures will be developed. In addition, the inspection results, if there are the following defects, the bearings can no longer be used, need to replace the new INA bearings.

a. Cracks and fragments appear in any of the inner and outer rings, rolling elements, and cages.

b. Any one of the inner and outer rings and the rolling elements are peeled off.

c. The raceway surface, the ribs, and the rolling elements have significant jamming.

d. The cage is worn out or the rivets are loose.

e. The raceway surface, rolling elements are rusted and flawed.

f. There are significant indentations and marks on the rolling surface and the rolling elements.

g. There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.

h. Superheated and discolored.

i. Grease seal bearing seals and dust cover damage are serious.

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