Analysis of the appearance of bearing fatigue damage

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Analysis of the appearance of bearing fatigue damage

Source: China Bearing Network Time: 2017-12-11
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The length of the moment that the bearing is presented from the beginning of the application of the first data is the speed of the bearing; the load is large.
Exhaustion is the result of the periodic presentation of the shear stress under the surface of the load; after a period of time; these shear stresses cause a slender cranium; then gradually extend to the outer surface; when the rolling element passes through the split cranium; Falling; constitutes the so-called "peeling appearance"; then the situation continues to expand with the skin; the bearing is damaged.
The above is a depiction of bearing fatigue; it begins to occur below the surface; although the initial stripping condition is generally very slender; but with the addition of stress and the increase of cracks; the extension of the stripping area; this damage generally remains very long A period of time; its remarkable period of time is when noise and sensation are added.
The bicycle bearing is in the beginning of the damage; it can only be felt when changing; it is found to have a pockmark in the later stage of the transformation; but it has a pockmark; the bearing is not incapable; only the beads and the shaft are traveled each time. Both the bowl and the shaft file have more wear and more severe damage; because the bicycle is a low-speed high-pressure type bearing method; therefore, even if the appearance of skin peeling is severe; it is not overwhelming; it is invisible and consumes you. The power of yours; and your feelings can only be that the car does not know why it is not good enough to ride.
Therefore, before the bearing is completely damaged; it provides the discovery moment that the operator satisfies; do not ignore the existence of such conflict; it will reduce the speed of riding; let the long-distance force cost more and slower.
If the roughness of the appearance is slender; if the lubricant film has the proper thickness; then the probability of external stress generation is properly low; this is why it is appropriate to properly select the appropriate oil for lubrication; however; if the pressure load exceeds The pu value of the oil film (the fatigue load limit value; such as excessive speed; excessive pressure impact); then the fatigue of the data will come sooner or later.
The reason for the early damage of the bearing - (lubrication is not appropriate)
Although it can be equipped with "protection-free" rubber-sealed bearings; however, the premature failure of the bearings still has a percentage of 36 because of the incorrect use of grease skills.
Any bearing that is not properly lubricated; failure to avoid early failure; because the bearing is the part of the hub that is not easy to assemble and disassemble; and the innate grease is used innately; and the grease is not replaced in later use; perhaps in the grease It will not be replaced in time after the carbonization and pollution change; then it is difficult for your hub to meet the long life and excellent lubrication.
The bicycles used in bicycles nowadays encounter small standard bearings that are mostly deep groove balls; such as 609; 6000; 6001; 6200; these are industrially used for the stator and rotor of small-scale motors; Such small Peeling is generally pre-installed with low viscosity; high-lubricity broad-spectrum grease.
In the past, we used to buy and use the most expensive greases of this kind; for example, we used the SKF LGMT-2 to form lithium-based grease; this is a low-torque, low-conflict small motor. Lubricating oil; also used in most small skf Palin; the price is still very expensive; the price of 200 grams of packaging is up to 60 yuan; but the viscosity of this oil is only 110; for high load; extreme pressure Reciprocating ability is poor; and according to the use of the bicycle shaft; this should be a low speed; high extreme pressure (because a lot of pressure will only be concentrated on a few fine Palin; and the impact will occur more Great pressure); So we later selected SKF's LGEP-2 to form lithium base grease; this is expensive (155 yuan); however, its viscosity reaches 200; high load; high waterproof; high rust resistance; Although it is not as good as LGMT-2 in the low torque conflict indicator, it is completely suitable for the front and rear axles and the front bowl of the bicycle (today we have some old hubs; if the rm40 correction is LGEP-2 lubrication).
Reasons for early damage to the bearing - (not properly installed)
Another reason for the damage is up to 16%; this is not the installation; and the fault is perhaps a violent loading method; so that the Palin is now hitting the surface of the bowl.
In order to make the Palin card tightly axis; avoid the occurrence of the sleeve conflicting image (this kind of appearance will occur when the high-speed transformation of the machine is high; the formation of lubricating oil burns and even causes the heat to rise and jam; form a stop); The bowl and the outer bowl (also known as the bearing box in the industry) use an "overweight" appearance; in a nutshell, the shaft is larger than the inner one; perhaps the outer bowl is larger than the load; this kind of interference requires a lot of strength to dry up Into such; the loading requires a great effort to strike the Palin; this will form the damage of the Palin in the process of tapping; therefore, the industrial large bearings generally use heating; hydraulic jacking and other methods.
Bicycles use glued deep groove ball bearings; such bearings are most afraid of knocking (the needles of Palin and Da Pei Lin are slightly more resistant to percussion); and they are not used for heating; but because of the bicycle Palin's over-profit is very good. 踔寥缜 琅嗔 琅嗔 琅嗔 目 目 目 杂 杂 杂 凰 凰 凰 凰 凰 凰 凰 凰 凰 凰 凰 凰 凰 凰 凰 凰 凰 那 那 那 那 那 那 那 那 那 那 那 那降 砻妫 砻妫 褂 褂 褂 褂 褂 褂 褂 褂 褂 褂 褂 褂 褂 褂 褂 褂 褂 褂 褂
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