Bearing basic knowledge and exception handling

Generally inside the bearing inner ring, outer ring, rolling elements and cage composed of four parts. For sealed bearings, further comprising a lubricant and a seal of two parts. Bearing at work, able to withstand the radial load or axial load, at a certain rotational speed, it will produce radial runout or axial runout. According to the working conditions of the bearing used to choose different types of bearings, bearing in order to better play the function, and can extend bearing life.
Life of roll bearings performance, because different purposes, in the required period to maintain their performance. Even though the correct bearing for a particular purpose will, after some time, noise, vibration increases, resulting in decline in accuracy due to wear, grease aging, fatigue, peeling rolling surface can no longer be used. Until these bearings can not be used in a broad sense during the bearing life. Each of them is known as: noise life, wear life, the grease life, the rolling fatigue life and so on.
Why bearing damage? Only a part of the bearing damage in practical applications. Most bearing applications over the life of the machine or the device itself. Bearing damage for many reasons - more than the anticipated load, non-tight seal with or caused by too small bearing clearance and so on. Any one factor has its special form of damage, and will leave special signs of damage. Therefore, to view damage to the bearings, in most cases you can find its possible factors, and based on these findings, the measures taken to prevent recurrence.
Generally speaking, a third of the bearing damage causes damage based on fatigue, another third reason is poor lubrication, the other one-third of contaminants into the bearing or improper installation process. Bearing damage is also associated with different forms of industrial relevance. For example, the electronics industry on the indoor temperature is higher, which requires fans must twenty-four hours operation, the fan bearings are mostly due to material fatigue caused damage; while the pulp and paper industry is mostly due to poor lubrication or bearing damage caused by pollution. Why bearing will fail prematurely? .
    Improper assembly
All kinds of bearing failure in advance, 16% were due to improper assembly and not caused by the use of assembly tools. Some devices require the use of mechanical, hydraulic or heating method for proper and efficient installation and removal. Using special tools and techniques for professional assembly, is to achieve the maximum extension of the machine running time another solution.
Improper lubrication
Although you can install a variety of "maintenance free" sealed bearings, bearings fail prematurely but there are still 36% is due to the incorrect application of grease technology and improper use. Any improper lubrication of the bearings will inevitably fail in advance of normal life. Since the bearing is usually the most difficult mechanical handling equipment part lubrication problem occurs infrequently.
Pollution
Bearings are precision parts, if the bearings and grease contamination will not operate effectively. In addition, as has been marked with grease maintenance-free sealed bearings all use only a small portion of the bearing, so all the early failure of the bearing at least 14% is due to problems caused by pollution.
Fatigue.
If the machine becomes overloaded, use or improper maintenance, the bearings will be affected, leading to premature failure of the bearing, 34% were due to fatigue caused by. Since the bearing in the maintenance of inappropriate or excessive stress would be given "early warning", so the equipment operator or maintenance personnel to observe the operation of the bearing performance anomalies. Why bearings require lubrication? In theory, a good lubrication in the ideal working conditions, the bearing life will always be met, of course, is simply not possible, but if the correct lubrication of bearings, bearing the longest working life. Bearing lubrication to reduce friction and wear within the bearing to prevent the sticking, its lubricating effect is as follows:
1, reducing friction and wear. Constituting the bearing rings, rolling elements and the mutual contact portion of the holder form a film, even in the case of heavy load, but also to prevent the metal contacts, reducing friction and wear.
2, the fatigue life.
Fatigue life of the rolling bearing, the rolling contact surface of the rotary good lubrication, is extended; otherwise, oil viscosity lubricant film thickness of the well bottom, is shortened.
3, the discharge frictional heat and cooling.
Circulating oil to the oil discharge method and the like can be generated by friction heat, the heat coming from the external cooling. Prevent bearing overheating, prevent oil itself aging. .
4, other.
Prevent dust and debris inside the bearing, or to prevent rust, corrosion effect.