Damage in the form of rolling bearings
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Damage in the form of rolling bearings
Rolling bearings during operation , if abnormal heat, vibration and noise sudden increase of the phenomenon , indicating that the rolling bearings may have been damaged, should be checked and analyze the reasons. Common failure modes are:
1 , fatigue spalling
Rolling bearings raceways or rolling surface , due to the role of alternating load the contact surface of the metal surface was flaking , and gradually expand to form pits. If you continue to run , then peel off the area to form the area . Due to improper installation or tilt the centerline of the housing bore and shaft bearings and other reasons make the local area to withstand greater loads and early fatigue damage.
2 , crack and fracture
Material defects and improper heat treatment , with too much interference , improper combination of design, such as the bearing surface with grooves caused by stress concentration , will form rings crack and break.
3 , indentation
When outside material into the bearing durum and pressure between the rolling element and raceway, make rolling surface indentation . Furthermore , excessive impact loads can also make local plastic deformation of the contact surface and a recess is formed . When the bearing is stationary, even if the load is small, the vibration of the surrounding environment will be uniformly distributed in the raceway formed pits .
4 , wear
When the rolling bearing sealing well, so that dust or particulate matter from entering the bearings , or poor lubrication , the contact surface will cause serious scratches or wear, and bearing vibration and noise increase.
5 , galvanic corrosion
Current through the bearings, will produce a small spark, leading to the emergence of the contact surface pits partial annealing or black highlights. Serious cases into large pits will appear.
6 , corrosion
Water or acids, bases , salts and other invasive bearing or lubricant from the bearing references improper selection of rust, corrosion precision bearings also allow even a slight bearing scrap.
7 , the cage damage
Rolling , especially high-speed bearings , because the lack of lubricant , the retainer rings and rolling elements or contacts generated at the wear , impact, and even lead to cage fracture .
Bearing dust seals
Sealed bearings life to a large extent determines its sealing performance, are commonly used for the folding-type bearings seals skeleton, it is generally fitted cap by hand pressure, the main disadvantages are: elastic strength is poor, poor assembly performance, poor sealing performance .
Bearing dust seal with hook crimping structure, compared with the prior art has the following advantages:
Good sealing performance, high seal strength because the skeleton structure of the hook bead effectively increase the flexibility of the seal rings, the size of the maximum astigmatic difference compensation dental mouth impact, not only by the resilient sealing elastomer bead structure produced there flexibility and strength, and improve the pass rate cap installed, and machine pressure, can effectively compress.
