The basic concept of bearing fretting life

Source: China Bearing Network Time: 2014-05-21

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The bearing is in a non-working condition; because of the effect of the oscillating load outside the bearing itself; the rolling element in the bearing is slightly slipped adjacent to the outer surface of the raceway in its touch area; then the wear is formed, and the oscillation imparts a touch to the surface metal molecule. "Energy"; and oxygen molecules take advantage of the chemical effects of the escaping metal molecules and the newly exposed active surface metals; then they form the corrosion of the metal; this appearance is called fretting abrasion; it is characterized by the appearance of the raceway Isometrically spaced from the roll; contoured with the roll {HotTag}; the appearance of the pit is sometimes bright; sometimes the worn metal particles are brownish red.
Fretting wear often occurs in bearings used in multi-speed gearbox clutches, hoists and cranes, coal shovel and backup generators.
When the pits that occur during fretting abrasion are expanded to a certain extent; the operation of the bearing will cause an unacceptable oscillation or impact to cause failure; the total number of hours in which the bearing is in a non-working condition and can withstand a certain oscillating load , called the fretting abrasive life of the bearing.
For the bearings used in the above clutches; the fretting life is often shorter than the fatigue life; so it is necessary to check.

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