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IKO bearing fatigue life in general sense refers to a certain technical conditions (structure, process, coordination, installation, clearance and lubrication of rolling bearings, etc.) running in the host state until the actual use, the rolling surface fatigue and bearing the host can not meet the requirements of inner, outer ring (shaft, seat) relative the rotation number -- gross total revolutions. When the bearing turns more approximately constant or is known, the fatigue life can be used with the total revolutions corresponding operation always expressed in hours, in addition, it should also be noted:
(1), factors affecting the fatigue life of IKO bearing very much, not all be estimated or by standard test conditions and to be eliminated, which caused a very discrete IKO bearing fatigue life, so the expression parameters of bearing fatigue life is rated life of L10, in the ISO R281 standard for L10 meaning clear the following:
"The number of enough the same batch of bearing, the rated life of L10 use Revolution (or at a constant engine speed when expressed in hours, the number of bearing 90% can reach or exceed the speed in the fatigue spalling occurred before (or hours)". So far, all countries in the world to comply with the above provisions.
In some countries USA etc., use the concept of median life. The median life LM refers to a group of the same IKO bearing fatigue life, namely the IKO bearing in 50% before fatigue spalling can reach or exceed the total revolution, or at a certain speed work from time to time, median life LM not a number of bearing life of the arithmetic mean value. General median life LM is about 5 times of the rated life.
(2), the concept of life ratings apply only to a sufficient number of a number of IKO bearing, but not for the individual IKO bearing.
In the measurement of IKO bearing radial clearance should pay attention to the following matters:
1 possible using special instruments measurement method;
2 by measuring the skill hand push method for measuring the requirements of measuring higher. This method of measurement error is large, especially when clearance of marginalized, easy to cause the error, at this time, should be the instrument measured;
3 feeler, should be operated according to the provisions of the standard, shall not be used on the roller from the examiner rolling measurement methods of the past;
4 the measurement process, should ensure that the ball fell into the ditch; closed type bearings in front of the closed measurement; when a Dutch instrument, measuring value should be less loading induced increase in clearance;
5 for multi row IKO bearing, the requirements of qualified each clearance, clearance from each column of the arithmetic mean as the IKO bearing radial clearance.