Scroll KOYO bearings during operation, the results to the abnormal heat, vibration and noise suddenly increased, indicating that the rolling KOYO bearings may have been destroyed, and shall promptly check and analyze the reasons. Common failure modes are:
1, the crack and fracture
Material defects and improper heat treatment, with the amount of interference is too large, the combination of poorly designed, such as the bearing surface grooves caused by the stress concentration, etc., will form a ring crack and fracture.
2, fatigue spalling
Scroll KOYO bearings raceway or rolling surface, under alternating load effect of the surface metal of the contact surface was exfoliated, and gradually expand the formation of pits. Continue to operate, will form an area of ??flaking region. Due to improper installation or the local area will enable the bearing of the centerline of the bearing bore and shaft tilt reason to bear a greater load to early fatigue failure.
3, the indentation
When outside durum material KOYO bearings, and the pressure between the rolling element and raceway to the scroll formed on the surface of the indentation. In addition, too much impact load can make the contact surface produce localized plastic deformation and the formation of pits. When the bearing is stationary, even if the load is small, due to the vibration of the surrounding environment will also be uniformly distributed pits formed in the raceway.
4, current corrosion
Current through the bearings, will produce a small spark, resulting in contact with the surface partial annealing pits or black bright spot. In serious condition into the larger pit.
5, wear
Rolling sealed well, so that dust or particulate matter from entering the bearings, or poor lubrication will cause more serious contact surface scratches or wear, and bearing vibration and noise increase.
6, corrosion
 Water or acids, alkalis, salts and other invasive bearings or lubricants, improper selection of the reference bearing corrosion, precision bearings, even if slight corrosion will also allow the bearing scrap.
7, cage damage
Rolling, especially high-speed bearings, cage and rolling element contact or ring at the wear, due to lack of lubricant, so that collision, and even lead to cage fracture.
8, KOYO bearing dust seals
 Life is largely decided by the sealing performance of seal KOYO bearings, now commonly used KOYO bearings, seals for folding type skeleton, it is generally by hand and press-fit cover.
The main disadvantages are: the elastic strength is poor, poor assembly performance, poor sealing performance.
KOYO bearings, dust seals with a hook crimping structure compared with the existing technology has the following advantages:
Good sealing performance, high seal strength, the reason for the skeleton structure of the hook curling effectively increase the flexibility of the ring, the maximum compensation for dental mouth size scattered poor, it is not only rely on the flexibility of the seal elastomers, as well as crimping structure flexibility and strength of the role and improve the fitted cover the pass rate and can be machine pressure, the effective compression.


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