1. Channel one-sided limit position falling off
　　Channel mainly in the one-sided limit position falling off from flaking of the junction of Raceway and ribs have a serious band. Produce is due to bearing installation are not in place or during the working of sudden axial acceleration load. Response is to ensure that the bearings are mounted in place or the free side bearing outer ring fit to a clearance fit, with a view to make bearings bearing overload compensation.
2. Channeling flaking is symmetric in circumference location
　　Symmetric location ring around cycle as with flaking, spalling performance, patrons circle is circumferential symmetrical position to peel (that is, the short axis of the ellipse), mainly because it produces the shell-hole separation of two half-ellipse is too large or shell hole structure, this performance is particularly evident in the camshaft bearings for motorcycle. While press bearing into the large side of the ellipse shell holes or in two separate case when fastening, make the bearing outer ring ellipse, in the short axis clearance significantly lower or even negative clearance. Bearings under load, the inner ring rotation peripheral signs of falling off, only on the short axis of the outer ring of symmetric location signs of falling off. This is the main reason for early failure of the bearing, the bearing failure by documenting that the roundness of the bearing outer diameter has changed from the original 0.8 μ m for process control 27 μ m. This value is much larger than the radial clearance values. Therefore, it is certain that the bearing is severely deformed and-clearance work, faces early exceptions on the rapid wear and spalling. 'S response is to improve accuracy or shell holes as much as possible in the shell-hole two separated structures.
3. Raceways inclined peeling
　　Face is inclined to peel on rings in the bearing zone, description of bearings under tilted work, when when the slope angle reaches or exceeds a critical state, early rapid wear of abnormal formation and easy to peel. Mainly because the installation had a negative, shaft deflection, the precision axle journal and the shell holes and low, take countermeasures to ensure the bearing mounting hole quality improve shoulder, shoulder axial runout accuracy.
4. Ring fracture
　　Rings typically have fewer failure, often caused by sudden overloads. Causation is complex, such as bearing raw material defects (bubbles, shrinkage), forging defect (fire), heat treatment defects (overheating), processing defects (partial burns or micro-cracks on the surface), host a defect (poor poor installation, lubrication, instantaneous overload), once with load shock load or high vibration is likely to make the ring fracture. Take countermeasures in order to avoid overload impact loads, select the appropriate interference, improve precision, use conditions and strengthened bearings of quality control in the manufacturing process.
5. Cage fracture
　　Cage fracture belonging to the occasional unusual failure mode. Its causes mainly in the following five areas:
　　　a． Cage of abnormal loads. As installed not in place, and tilt, and had Ying volume had large, easy caused tour gap reduced, increased friction health hot, surface softened, premature appeared exception peeling, as peeling of extended, peeling foreign body into keep frame Pocket Hole in the, led to keep frame running block and produced attached load, increased has keep frame of wear, so deterioration of cycle role, will may caused keep frame break.
　　　b． Poor lubrication mainly refers to the bearing operation is a lean, easy to form adhesive wear, surface deterioration, adhesive wear tore into cages, cages produce an exception loading, it is possible to keep breaking.
　　　c． Cage fracture caused by intrusion of foreign bodies from is a common pattern. External hard foreign body penetration of retainer wear with the exception of the additional load, may also cause the cage fracture.
　　　d． Cage fracture caused by creep phenomenon is one of the reasons. Phenomenon called creep means a slip ring, in the mating surfaces without sufficient interference, loads to move around due to the slide, ring shaft or housing in a circumferential direction deviation of the position. Creep-once, coupled with significant wear, wear powder can come into bearing, forming abnormal wear--roller flaking – cage wear and additional load, and may result in cage fracture.
　　　e． Cage material defects (such as cracks, large effects of metallic inclusions and shrinkage, bubbles) and riveting defects (short nails or nails, pad in half cage surface voids, grave rivet hurt), which may result in cage fracture. Responses to be strictly controlled in the manufacturing process.

 


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