Bearing operation trajectory and method of loading

Source: China Bearing Network Time: 2017-12-31

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Bearing operation track and load method summary: bearing transformation inner ring outer ring raceway rollover roll touch operation track track track surface is abnormally known load condition bearing condition Know the negative radial load to accept the axial load to accept the moment load bearing pole rigidity equal view bearing can add accidental load liquid dynamic pressure bearing common shaft shell with shaft bearing a transition, inner ring and outer ring raceway surface; due to rolling The body is a roll touch; therefore, the work track is a dark surface; the work track attached to the raceway surface is not attributed to the abnormality; thus the load condition can be known; therefore, in the case of removing the bearing; please pay close attention to and investigate the raceway Face track.
If you carefully investigate the trajectory of the work, you will know that you only bear the radial load; accept the large axial load; accept the moment load; or have the pole rigidity inequality on the bearing housing. Can check whether the bearing can be accidentally added. Whether the load and equipment errors can be too large, etc.; and become the clue to trace the cause of bearing damage. The trajectory of the deep groove ball bearing produced under different load conditions.
(a) is a general working trajectory that can only accept radial loads when the inner ring rotates.
The work trajectory shown in (c)-(h) has a bad influence on the bearing; most of the service life is relatively short.
The working track of the roller bearing is also the same (i) is the outer ring working track when the cylindrical roller bearing used in the inner ring rotating load is correctly added with radial load.
(j) is the opposite of the inner ring and the outer ring; the deflection of the shaft is large; the working track of the raceway surface; the shading occurs at the exit of the load ring in the longitudinal direction; the working track is skewed; the double-row cone The roller bearing rotates the inner ring.
(K) indicates that the working track of the outer ring is only responsible for the radial load. L indicates the trajectory only when the axial load is applied. When the inner ring and the outer ring are relatively skewed and only receive radial load, the working track is violated. Orientation (m) of 180 degrees on the two track surfaces.
Stainless steel hybrid ceramic bearing stainless steel hybrid ceramic bearing summary: For many years ceramic materials have been engaged in bearing research engineers interested in information ceramic bearings generally think of thorough ceramics work without smooth bearings early many jobs gather high temperature environment ceramic bearings to study air turbine engine bearings The current bearing demand continues to improve the smooth system. The development work will be gathered in the steel raceway ceramic ball to form a hybrid bearing hybrid bearing. The machine tool liquid dynamic pressure bearing is usually used for shaft shaft matching for many years; ceramic materials have been the most engaged engineers in bearing research. Interested in the material. The term "ceramic bearing" generally makes people think that the work made entirely of ceramics is red and hot without the use of smooth bearings. Many of the early work will focus on the study of all-ceramic bearings in high temperature environments; For example, air turbine engine bearings. The current bearing is still continuing; but the demand for improved smooth systems. The development work has been concentrated in steel ferrules or hybrid bearings composed of raceways and ceramic balls. Hybrid bearings are now available. The machine tool spindle is used in such an urgent need; and Its use more widely.
There are many kinds of ceramic materials; their composition, microscopic arrangement and function are different. It has been proved that silicon nitride materials have the best physical and mechanical induction functions for bearings. The current annual output of silicon nitride balls worldwide In the millions of grains.
The most important features of hybrid ceramic bearings compared to all types of all-steel bearings are:
1. The speed of the work is improved; because the density of the silicon nitride ball is low, the centrifugal force is reduced.
2. Increased rigidity; because the elastic modulus of silicon nitride is 50% larger than that of bearing steel.
3. Heat reduction; because silicon nitride ball has a small friction coefficient and good motion function.
4, better thermal stability; because the thermal expansion coefficient of silicon nitride is one-third of steel.
5. The rendering flexibility is greater; due to the silicon nitride data function, the bearing painter can convert different parameters without thinking about the effects.
When applied to machine tools; these features make the yield and processing accuracy improved; the quality of the product is improved. Traditionally, smooth equipment for high-speed spindle bearings generally uses oil-air or oil mist smooth system; The function of the bearing. On the other hand; the hybrid bearing can safely choose the grease smooth. For the machine tool builder; the elimination of the oil-gas smooth system can significantly reduce the cost.
Hybrid ceramic bearings for use in aircraft engines are also under development. Air turbine engines operate at high speeds; centrifugal forces on the balls in their bearings; often become a major factor limiting the maximum engine speed. Low-density nitriding The hybrid bearing of the silicon ball provides the possibility of working at higher speeds; in addition, the internal heat of the bearing is less; the component can be significantly reduced.
The most common way to mix ceramic bearings is an angular touch ball bearing with a silicon nitride ball; this type of bearing can effectively operate at high speeds with both radial and axial loads. However, axial loads can only be applied from one direction. Therefore, these bearings are generally paired with equipment and preloaded to ensure the correct touch angle. The angular touch ball bearing and the deep groove ball bearing have larger opening at one end; therefore, the reinforced phenolic resin cage is generally used. Some hybrid bearing products are in the data. Although it only turns the steel ball into a silicon nitride ball; on the other hand, the dimensions of the channel are also improved to optimize the bearing function. Other types of ceramic balls can be used for special occasions; like external bearings and gyros Bearing.

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