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Learn how ball bearings work to make it more useful

Time:2020.03.25  Source:Roller Bearings Suppliers


Bearings can be divided into two types of sliding bearings and rolling bearings, and deep groove ball bearings are the most widely used, most widely used and most common type of rolling bearings. Deep groove ball bearings are relatively simple in structure and easy to mass produce, so it is less difficult to achieve high manufacturing accuracy. People's life has the shadow of deep groove ball bearings everywhere. For example, high-end mountain bikes now require ball bearings to support axles and spokes, ensure speed and rotation accuracy, and reduce rotor wear. This article discusses the application of ball bearings in people's daily life from the aspects of composition principle and motion realization. Understanding how ball bearings work can make the most of its functions.Industrial ball bearings are just as important as civilian ball bearings.

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Although the ball bearing has a low bearing capacity, it has low friction and high limit speed. In actual use, its radial clearance can be appropriately enlarged to increase its axial bearing capacity. Therefore, ball bearings are widely used in general machinery in life. People can easily find the shadow of deep groove ball bearings in mountain bikes and yo-yos, and even playful children know a little about deep groove ball bearings. The author is exactly a mountain bike enthusiast and understands the importance of different bearings to the performance of mountain bikes.Click here for bearing measurement chart.

As the precision machinery around us, the correct selection of different types of bearings on the performance of mountain bikes can not be ignored. Similarly, all kinds of machines in life require appropriate bearings, which requires us to have a considerable understanding of bearings.

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How ball bearings work

When the ball bearing works, half of the inner ring rotates and the outer ring does not move, and the rolling elements roll between the inner and outer rings. At this time, the cages evenly separate the rolling elements to reduce friction and wear between the rolling elements. The cage also plays a role in distributing the rolling equidistantly, thus reducing the friction and wear between the rolling elements. The rolling body not only rotates around its own axis, but also revolves along the raceway of the ring and the axis of the bearing, and while rolling, it is accompanied by a fixed slip. The rolling body changes the friction between the relatively moving surfaces into rolling friction.

After understanding the movement of the above-mentioned ball bearings during work, the instantaneous force analysis was performed on the ball bearings.

When the ball bearing is stationary, the contact surface between the rolling element and the inner and outer ring is subjected to static load, while the outer ring raceway surface is locally cyclic or statically stressed. When the rolling element is at the lowest point, the rolling element, the inner ring and the outer ring show the maximum stress. When the deep groove ball bearing starts to work and the inner ring rotates coaxially but the outer ring does not move, the rolling element generates frictional force along the raceway of the ferrule.The rolling body and the inner ring are in contact immediately before and after the contact, and the contact surface will produce a cyclic interaction. Become stressed. It can be seen that the ball bearing bears different effects when it is stationary and in motion, so in actual assembly, it is necessary to distinguish between the rated static load and the rated dynamic load of the bearing.

From the above analysis, it can be known that ball bearings mainly bear the radial load on the contact surface, but under certain circumstances can also bear the radial load and the axial load at the same time, but its axial load capacity is relatively small. When it only bears radial load, the contact angle is zero. When there is axial force, the contact angle is greater than zero. Therefore, deep groove ball bearings with large radial clearance have the performance of angular contact bearings, which can increase the axial bearing capacity.

In summary, in general, ball bearings are not impact resistant and cannot withstand heavy loads, but the friction coefficient is small and the limiting speed is high.

After the ball bearing is assembled, the axial displacement in both directions of the housing or the shaft is limited within the range of axial clearance, so the ball bearing can be positioned in both directions. It is worth mentioning that the ball bearing has a certain self-aligning ability. For example, when the bearing is inclined to the casing hole by 10 ′, the entire structure can still work normally without considering the impact on the bearing life.

Of course, the modified bodies based on the basic type of ball bearings also have similar working principles, but in order to meet the needs of certain mechanical movements, people have given them more functions. For example: deep groove ball bearing with stop groove, when the stop ring is installed in the stop groove, the position of the bearing is determined in the housing, thereby simplifying the bearing positioning mechanism. Single row deep groove ball bearings 623-2RS; Double row deep groove ball bearings 4200.

The deep groove ball bearing with rubber seal is based on the ordinary deep groove ball bearing, and a rubber seal with a skeleton is added. The modified deep groove ball bearing is greatly improved in water resistance, dust resistance and sealing reliability. These bearings are widely used in low-noise machinery. A deep groove ball bearing with a dust cap is equipped with a dust cover on the outer processing groove of the rib on the basic structure. These bearings are usually used once, so the right amount of grease is important for their assembly. Therefore, it is frequently used in poorly lubricated and dusty environments, and can work for a long time without maintenance.

Conclusion: Although the bearing is small, it is very important. In the process of mechanical assembly, only by profoundly understanding the composition and working principle of various types of bearings can its functions be maximized.

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