Large spherical roller bearing failure case details

The spherical roller bearing is used in a wind turbine main shaft bearing, it is understood that the large spherical roller bearing in the process of using bear a large axial load, resulting in partial load spherical roller bearing, bearing of a complete set of to the heart, causing shaft raceway surface spalling, eventually lead to bearing failure. Below the bearing network ( Hereinafter referred to as:) To share, the spherical roller bearing under the condition of partial load failure. 1, spherical roller bearing failure, macro the partial load side near the gearbox spherical roller bearing, marked as A side; On the other side near the blade, marked B side. On both sides of outer ring raceway surface A side there are shallow flaking and crush marks, area of surface color, its surface side face by diameter weeks to run the wear trace; The other side of the raceway surface circumferential marks of wear and tear and multiple axial indentation, as shown in figure 1 a. Outer diameter surface micro corrosion trace, as shown in figure 1 b. Figure 1 self-aligning roller bearing outer ring section morphology on both sides of inner ring raceway surface more than A side there is peeling, rolling serious; B side running wear trace is not obvious; On both ends of the guard there extrusion and wear trace, as shown in figure 2 a shows. And the inner surface micro corrosion marks, as shown in figure 2 b. Figure 2 failure of bearing inner ring section morphology of bearing inner ring raceway A side spalling observed, peeling off in this direction arrow from A side guard outside side along the axial direction inward extension, as shown in figure 3. Figure 3 bearing inner ring and flaky morphology. A side roller working surface spalling, rolling, surface discoloration. B side roller at both ends and the middle area there weeks to run the wear trace, as shown in figure 4. Figure 4 failure part bearing roller shape. A cage pocket hole is A lot of trace metal debris and deep extrusion and wear print operation, part of the pocket hole edge edge phenomenon; B there is very little scrap metal cage pocket aperture, squeeze traces and operating the wear trace is lighter, as shown in figure 5. Figure 5 the failure bearing cage pocket hole 2, result in spherical roller bearing failure cause analysis of partial load 1) Self-aligning roller bearing in the installation and use if large axial load, making unilateral raceway bearing is bigger, easy to produce bearing jammed, rotation is not flexible, unable to adverse effects such as heart, lead to bearing failure. 2) The spherical roller bearing outer ring, inner ring of A roll spalling, severe crush, inner ring peeling consists of A lateral edge axial extension inward, and there is A side roller rolling surface is peeling, wear and tear, and the side of the cage RCC is serious, that bearing in use by large axial load, causing partial load, bearing on one side of the raceway bearing is bigger, the other side of raceway bearing is small, can't get to the heart, causing bearing ring A side raceway and the side roller working surface fatigue spalling, eventually lead to bearing failure. 3) By the bearing inner ring diameter surface axial spacing micro corrosion marks, bearing vibration is larger in the process of operation or cooperate with spindle surface is not quite close together, contact surface as a tiny reciprocating swing, micro convex body surface oxidation and wear off, produce micro corrosion. 4) In addition, the bearing outer ring two quenched tempered troostite organizations do not conform to the requirements of the standard, the improper heat treatment technology that the outer race, the unqualified troostite organization, reduce the service life of bearing. 5) Rolling serious peeling, bearing didn't stop running after peeling, continue to operate for a period of time, until the bearing temperature, temperature detector alarm. 3, spherical roller bearing failure reasons mainly spherical roller bearing in use process under high axial load, making unilateral raceway bearing is bigger, lead to bearing load. A complete set of bearing in the process of operation, not the heart, causing bearing ring raceway and roller working surface fatigue spalling, lead to bearing failure, slant of the spherical roller bearings, bearing is the main reason for the failure, because of improper heat treatment can, unqualified troostite organization bearing outer ring, reduce the service life of the bearing.