Damage in the form of a rolling bearing
Rolling bearings during operation, if abnormal heat, vibration and noise suddenly increases phenomenon that rolling bearings may have been damaged, and the analysis of the reasons should be checked. Common failure modes include:
1, fatigue spalling
In rolling bearings raceways or rolling surface, due to the action under alternating load the contact surface of the metal surface was flaking, and gradually expand to form pits. If you continue to operate, then the area of flaking area is formed. Due to improper installation or centerline inclined bearing bore and shaft bearings and other reasons will bear a greater burden in the local region and the emergence of early fatigue failure.
2, crack and fracture
Material defects and improper heat treatment, with the amount of interference is too large, improper combination of design, such as a bearing surface grooves caused by stress concentration, crack and fracture formed rings.
3, the indentation
When the outside durum material into the bearing, and pressure between the rolling elements and raceway, the rolling surface can form indentations. In addition, an excessive impact load can also make contact with the surface of local plastic deformation which pits are formed. When the bearing is stationary, even if the load is small, due to the vibration of the surrounding environment will be evenly distributed in the raceway pits are formed.
4, wear
When the rolling bearing seal is not good, so that dust or particulate matter entering the bearing, or poor lubrication will cause more serious contact surface scratches or wear and bearing vibration and noise increases.
5, galvanic corrosion
Current through the bearings, will produce a small spark, leading to the emergence of the contact surface partial annealing pits or black highlights. Into a large pit in serious cases will appear.
6, corrosion
Water or acids, bases, salts and other invasive bearing or lubricant selection inappropriate references from bearing corrosion, rust precision bearings also allow even a slight bearing scrap.
7, the cage damage
Rolling, especially high-speed bearings, due to the lack of lubricant, the retainer and the rolling elements or rings generated at the contact wear, impact, and even lead to cage fracture.
Bearing dust seals
Life sealed bearings to a large extent determined by its sealing performance, is now commonly used as a folding type Bearing seals skeleton, which generally cover fitted by hand pressure, the main drawback is: elastic strength is poor, poor assembly performance, poor sealing performance .
Bearing dust seal with hook bead structure, compared with the prior art has the following advantages:
Good sealing performance, high seal strength, the reason for the hook bead skeleton structure effectively increases the flexibility of the seal rings, the maximum compensation for dental mouth size scattered poor impact, not only by the elastic sealing elastomers, as well as crimping structure produce elasticity and strength, and improve the pass rate capping, and machine pressure, can effectively compress.