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1. Channel unilateral limit position spalling
Channel one-sided limit position flaking mainly in the channel wall at the junction of serious spalling ring band. Causes the bearings installed in place or sudden axial overload during operation. Take measures to ensure that the bearing mounted in place or the free side bearing outer ring with clearance fit instead, in order to be compensated bearing overload bearing.
2. Channel spalling was symmetrical positions in the circumferential direction
The symmetrical position peeling performance around the ring with flaking in the inner ring, while the outer ring was weeks flaking to the symmetrical position (ie, the direction of the short axis of the ellipse), its causes too large oval shell hole or pore structure of two halves separate housing this motorcycle is particularly evident in the performance of the camshaft bearing. The bearing outer ring bearings pressed into oval large shell hole or two solid tight semi-split shell, oval, in the direction of the short axis clearance is significantly reduced or even negative clearance. Bearing in the effect of the load, the rotating inner ring generated circumferential traces to the peeling, the outer ring only symmetrical positions in the minor axis direction of flaking traces. This is the main reason for early failure of the bearing, the piece inspection showed that the bearing failure, the bearing outer diameter roundness from the original process control the 0.8μm become 27μm. This value is much larger than the value of the radial clearance. Therefore, you can be sure the bearing is severely deformed and negative clearance work, work surface and early formation of a sharp abnormal wear and spalling. Take countermeasures to improve the the shell hole machining accuracy or do not use as much as possible the separation structure of the two halves of the shell hole.
3. Raceways inclined spalling
In the bearing surface is inclined spalling endless belt, the bearings are to work in an inclined state, and when the inclination angle reaches or exceeds the critical state, and early formation of abnormal rapid wear and spalling. The main cause of poor installation, shaft deflection, low precision of the journal and the shell hole, to take measures to ensure the the bearing mounting quality and shaft shoulder, axial runout accuracy of the hole shoulder.
4. Ferrule fracture
Ferrule fracture failure generally rare, often sudden overload cause. Causes are more complex, such as bearings defective material (bubbles shrinkage), forging defects (overfiring), heat-treated defects (overheating), processing defects (partial burns or surface micro-cracks), host defects (poor installation, poor lubrication, instantaneous overload), are likely to make the ferrule fracture, once trained to set out to shock loads or excessive vibration. Take countermeasures to avoid overload shock loads, select the appropriate amount of interference, improve installation accuracy, to improve the conditions of use, and to enhance the quality of the bearing manufacturing process control.
5. Cage fracture
Cage fracture is sporadic non-normal failure mode. Causes the following five areas:
a. The retainer abnormal loads. Such as the installation is not in place, tilt, excessive interference could easily lead to the reduced clearance exacerbated friction and heat, surface softening, premature abnormal flaking, with the extension of peeling, flaking foreign matter into the cage pockets, leading to maintain The frame operation block and generating the additional load, aggravate the wear of the holder, thus deteriorating the loop effect, it may cause the cage fracture.
b. Poor lubrication mainly refers bearing operation in a lean state, easy to form the adhesive wear, the state of deterioration of the working surface, adhesive wear and tear was easy to enter the holder, so that the holder to produce abnormal load, it is possible to cause the cage fracture.
c. Foreign intrusion caused by the to cage fracture failure of the common mode. Due to the intrusion of foreign hard foreign, exacerbated the retainer wear and generate the abnormal additional load, and also may lead to cage fracture.
d. The creep phenomenon is caused by the keep the rack fracture one of the reasons. Called creep multi ferrule sliding phenomenon, in the case of mating surfaces insufficient amount of interference due to the sliding of the load point is moved to the circumferential direction, resulting in the ferrule relative to the shaft or housing in the circumferential direction position deviation phenomenon. Creep Once generated, the mating surfaces significant wear, abrasion powder entering the bearing inside the process of the formation of abnormal wear - raceway spalling - cage wear and additional load, and even may cause cage fracture.
e. Retainer material defects (such as cracks, large pieces of different metal inclusions, shrinkage, bubbles) and riveting defects (missing nails, mat nail or two half-cage combination of surface voids, serious riveting injury) are likely to cause cage fracture . Take countermeasures to be strictly controlled in the manufacturing process.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7926CTYNDBLP4 NSK | 130 | 180 | 24 |
| 7924A5TYNDBLP4 NSK | 120 | 165 | 22 |