The role of the cage in the INA universal joint bearing


The use factor mainly refers to whether the installatio […]

The use factor mainly refers to whether the installation adjustment, use and maintenance, maintenance and repair meet the technical requirements. According to the technical requirements for installation, use, maintenance and maintenance of universal joint bearings, monitor and inspect the load, speed, working temperature, vibration, noise and lubrication conditions of the INA bearing in operation, and find the cause immediately if the abnormality is found. Adjust to make it back to normal. The installation condition is one of the primary factors in the use factors. The bearing is often caused by improper installation, which causes the stress state between the various parts of the bearing to change. The bearing runs in an abnormal state and ends its service life early. The main internal factors are Refers to the three major factors that determine the quality of the bearing, such as structural design, manufacturing process and material quality.


The metallurgical quality of bearing materials used to be the main factor affecting the early failure of universal joint bearings. With the progress of metallurgical technology (such as vacuum degassing of bearing steel, etc.), the quality of raw materials has been improved. The proportion of raw material quality factors in bearing failure analysis has dropped significantly, but it is still one of the main factors affecting INA bearing failure. The proper selection of materials is still a factor that must be considered in bearing failure analysis.

Bearings are of two types, with and without cages. Among them, large bearings are generally required to withstand larger loads, often without a cage, but are filled with rolling elements between the inner and outer raceways. And most of the small and medium-sized rolling bearings are with cages.


In the process of INA bearing processing, how do the outer ring, inner ring, rolling element and cage of universal joint bearing fit together? Simply put, first put the inner and outer rings of the bearing, put the inner ring aside, then put the rolling elements (put aside), then adjust the position of the rolling elements, and finally, put the cage. Now everyone knows that the cage is involved in the processing of the bearing. So what is the main role of the bearing cage?


The role of the cage is:
1. Guide and drive the rolling elements to roll on the correct raceway;
2. The cage separates the rolling elements at equal distances and is evenly distributed on the circumference of the raceway to prevent collision and friction between the rolling elements during work;
3. In a separable bearing, the rolling element and a ferrule are combined to prevent the rolling element from falling off.


Bearings are called windows, which are used to isolate and guide the rolling elements. The pocket gap allows the cage to have a certain amount of movement in the radial and axial directions, and the total amount of movement in the radial direction is called the cage gap. There are many structural types and complex shapes in the roller cage. There are many equidistant pockets on the cage. The shapes of the pockets are spherical, round, elliptical, rectangular and toothed. The size of the pockets is larger than the size of the rolling elements. The difference between the two is the pocket gap. Sometimes the window of the bearing cage The connecting part between is called the lintel, which plays the role of connecting and increasing the strength of the cage.


The manufacture of INA bearings generally involves multiple processing procedures such as forging, heat treatment, turning, grinding and assembly. The rationality, advancement and stability of each processing technology will also affect the life of the bearing. Among them, the heat treatment and grinding processes that affect the quality of the finished universal joint bearing are often more directly related to the failure of the bearing. In recent years, studies on the deteriorating layer of the bearing working surface have shown that the grinding process is closely related to the bearing surface quality.


The main task of INA bearing service life analysis is to find out the main factors causing bearing failure based on a large number of background materials, analysis data and failure modes, so as to propose improvement measures to extend the service life of the bearing and avoid universal joints. Sudden early failure of the bearing occurred.

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