Solution of bearing fatigue damage and cause analysis

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    Part I: Analysis of bearing fatigue damage:
1), bearing a material fatigue phenomenon from the start using the guide, this period is the length of the speed and bearing, the size of the load, lubric ation cleanliness relationship.
2), fatigue load surface shear stress periodicity formed after a period of time, these shear stress caused a small crack skull, and then gradually extend to the surface, when rolling after these split skull, then some split block off, forming the so-called "peeling phenomenon", then continue to expand with the stripping, bearing damage unusable.thin section bearing
5), before the complete destruction of the bearing, it provides users found enough time, do not ignore the existence of such a friction, it will make the ride slowed down, so that greater consumption of long-distance physical slower.
If the surface roughness is slight, the lubricant film with appropriate thickness, then the probability of surface stress generated quite low, which is why the appropriate choice oil suitable for lubrication reasons, however, if the press ure load over film pu value (fatigue load limits, such as excessive speed, high pressure shock), the fatigue of the material will come sooner or later.
4) bicycle bearing the initial stage of damage, it may only rotation is difficult to feel, and the sense of pitting late discovery rotation, a sense of pitting, the bearings are not can not be used, but in each forward beads and bowls and shaft profile to greater wear and more serious damage, because the bike is a low speed and high pressure type bearing, so even if the surface stripping is serious, nor is it unusable, but an invisible silent drain your power, your feelings may only feel that the car does not know why bad riding ring true.
3) above, bearing the description of fatigue, which was originally below the surface, although the initial peeling usually very slight, but with the increase of stress and the increase of the crack block, resulting in the peeling area of ​​spread, the damage situation usually maintained for a long period of time, the stage is visible in the increase in noise and vibration.
Part II: Bearing damage causes and solutions:
Any improper lubrication of the bearings, are inevitable failure in advance, due to the bearing hub in the plastic is not easy assembly and disassembly of parts, the innate use of incorrect grease without the use of the late replacement grease or grease occur carbonation deterioration of pollution does not promptly replaced, that your hub is very difficult to have a long enough life and good lubrication.
2), bearing in advance the causes of damage of the two improper assembly
Although you can install the "free" plastic seal bearing, but still in the early failure of bearings percentile 36 is caused due to incorrect grease technology.
The past, we also have a large number of errors to buy and the price is quite expensive to use this type of grease, such as SKF purchase LGMT-2 Lithium grease, which i s a low-torque, low-friction motor oil , which most trumpet skf bearing, when the price is very expensive, 200 g packaging prices as high as 60, but only 110 so that the viscosity of the oil-bearing for high load, extreme pressure, reciprocating motion the ability is poor, according to the use of the bicycle axis, which should be a low-speed, high extreme pressure because a lot of pressure is concentrated in only a small bearing will produce a greater pressure, and the impact of jumping, so we later chose to SKF s LGEP-2 synthesis of lithium-based grease, and this price is also expensive (155 yuan), but its viscosity up to 200, high load, high water, high anti-rust, high vibration, while the low torque not as good as LGMT-2 away from the friction index, but perfectly suited to bike around the central axis and the car first bowl of the group (today we have some old models of hubs, such as rm40 repair the use LGEP-2 lubrication).big ball bearing
Bicycle use with forest we encounter the small size of most of them are deep groove ball bearings, such as 609,6000,6001,6200 for small-scale industrial motor stator and rotor bearing such a small bearing at the time of purchase is usually pre-installed is a low viscosity, high lubricity broad-spectrum grease.
Improper 1), bearing in advance the causes of damage one of the lubrication
Damage to another up to 16 percentage reason is the improper assembly of the error or loading of violence, makes those bearing smooth pan bowl surface percussion flawed when loaded.

To Peilin Ka tight axis, prevent bushings friction phenomena generated (this phenomenon will be in the high-speed rotating machinery and instantly generate high temperatures caused by the lubricants dry out and even lead to the heat and get stuck, resulting in shutdown), so the bearing inner pan and the outer bowl (also known as indust rial bearing box) using a phenomenon of "interference", the popular pan large axis than the inner, or outer bowl than loading large objects, such Guo Ying needs a lot of power can be loaded income, while percussion require great strength, which can cause bearing damage in the process of knocking, so the industrial Bearings are usually heated, hydraulic jacking into such a load on the bearing.
Bicycle use is plastic sealed deep groove ball bearings, such bearings are most afraid of tap (needle roller bearings and bearing slightly stronger resistance to percussion), and also not use the heating load, but due to bicycle bearing the interference is very small, even hand put the Ru Peilin bearing hubs such as Qing Hao, so use plastic hammer typing is a relatively safe, but the top into the scapegoat thing is a very flat surface, use of static press, such as a vise to compress is the best way.roller bearing co