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NTN bearing failure form and countermeasures

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When the NTN bearing is pressed into the elliptical housing hole or the two halves are fastened; the bearing outer ring is elliptical; the clearance in the short axis direction is significantly reduced or even negative. The bearing is under load. The inner ring rotates with circumferential shedding marks; the outer ring only shows signs of shedding in the symmetrical orientation of the short axis; this is the primary cause of the early failure of the bearing. The bearing is inspected and marked; the NTN bearing outer diameter roundness It has changed from 0. 8μm controlled by the original process to 27μm; this value is much larger than the radial clearance value.
Therefore, the NTN bearing can be operated under severe deformation and negative clearance; the working surface is easy to form an abnormal sharp wear and fall early; the adopted countermeasure is to improve the machining accuracy of the outer casing hole or to use the outer casing hole instead. Separate layout. The raceway is skewed off on the bearing working surface with a skewed off-loop; it clarifies that the bearing is working under skew conditions; when the skew angle reaches or exceeds the critical condition; it is easy to form an abnormally sharp wear and fall off early. The reason is mainly because the device is bad, the shaft has deflection, and the accuracy of the journal and the shell hole is lower. The countermeasures are adopted to ensure the quality of the NTN bearing device and improve the axial runout accuracy of the shoulder and the shoulder.
a. Abnormal load of the cage. If the device is not in place, skewed, excessive interference is easy to form clearance reduction; increase conflict heat generation; appearance softening; premature occurrence of abnormal shedding; followed by the expansion of shedding; shedding foreign matter into the cage pocket Incurs the cage operation block and additional load; the wear of the cage is aggravated; the deterioration of the cycle effect; the cage crack can be formed.
b. The poor smoothness mainly means that the NTN bearing operation is in a lean state; it is easy to form adhesive wear; the appearance of the work is deteriorated; the tearing material caused by adhesive wear is easy to enter the cage; the cage is subjected to an abnormal load; and the cage can be cracked.
c. The intrusion of foreign objects is a common form of cracking failure of the cage. The intrusion of foreign hard foreign objects increases the wear of the cage and the abnormal additional load; it can also cause the cage to crack.
d. The creep appearance is also one of the reasons for the cracking of the cage. The so-called creep multi-finger slewing surface; in the case of lack of interference in the cooperation surface; the load point moves in the surrounding direction because of the sliding; The appearance of the shaft or the casing facing away from the circumferential direction. Once the creep occurs, the cooperating surface is obviously worn; the wear powder has the ability to enter the inside of the NTN bearing; the process of forming the abnormal wear and rolling off the cage wear and the additional load; so that the cage can be constructed Cracking.
e. Disadvantages of cage data (such as cracks, large foreign metal inclusions, shrinkage cavities, air bubbles) and riveting defects (nails, studs or two halves of the cage contact surface; severe riveting) can constitute cage cracking Adopting countermeasures is to strictly control the production process.

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