Disassembly Skills And Maintenance Methods Of Ntn Bearing
Disassembly Skills And Maintenance Methods Of Ntn Bearing
2022-01-04
Bearing Heat Treatment Technology And Equipment
Bearing Heat Treatment Technology And Equipment
2022-01-04

Non Contact Sealing Of Rolling Bearing

Non Contact Sealing 

Common non-contact seals include gap seal, oil slinger seal and labyrinth seal. Due to the gap, in addition to the oil slinger seal, the non-contact seal is mostly used for grease lubrication. In order to improve the reliability of Non Contact Sealing seals, various seals can be combined.

Because there is no friction at the sealing gap of the non-contact sealing device except the internal friction of the lubricant, the non-contact seal will not be worn, used for a long time and will not produce obvious temperature rise. It can be applied to places with high speed. However, the sealing clearance shall not be too large, otherwise the sealing effect is very poor.

Non contact seal of bearing support:

1. Clearance seal: simple structure, which can meet the sealing requirements under general Non Contact Sealing conditions. Selection of clearance e, D ≤ 50mm, e = 0.25 ~ 0.40mm; d>50mm,e=0.25~0.6mm。

2. Groove sealing: after the groove is filled with grease, it is difficult for dust to invade. There are two forms: ring groove and spiral groove. There are Non Contact Sealing generally 3 ring grooves. Groove width b = 3 ~ 5mm; Groove depth t = 4 ~ 5mm.

3. Labyrinth seal: when the labyrinth is filled with grease, the sealing effect is better than that of groove seal. Labyrinth seals can be divided into radial and axial forms. Selection of Non Contact Sealing radial and axial clearance: D ≤ 50mm, a = 0.20 ~ 0.30mm, B = 1.0 ~ 1.5mm; d=50~200mm,a=0.30~0.50mm,b=1.5~2.0mm。

Non Contact Sealing Of Rolling Bearing

4. Inclined labyrinth seal: it is used when the shaft deflection is large,

and the inclined surface of the curved road can swing with the center. Better sealing effect can be achieved after Non Contact Sealing filling lubricating grease in the curved path of inclined labyrinth seal.

5. Stamping steel sheet labyrinth seal: a synthetic labyrinth seal composed of stamping steel sheets. The Non Contact Sealing stamping steel sheets can be fitted on the shaft or shell without axial fastening, and the structure is simple. If the labyrinth of stamping steel sheet is filled with grease, it has better sealing effect.

6. Oil slinger seal: during oil lubrication, open a groove on the shaft or install a ring to throw out the oil to be lost radially and flow back to the oil pool through the oil collecting Non Contact Sealing chamber and oil hole on the bearing cover. An oil slinger can also be installed close to the bearing, which is often used in combination with the gap seal.

Abnormal load of cage. If the installation is not in place, the inclination and the interference amount are too large, it is easy to Non Contact Sealing reduce the clearance, aggravate the friction and heat generation, soften the surface, and premature abnormal spalling.

With the expansion of spalling, the spalling foreign matter enters the Non Contact Sealing cage pocket, resulting in the operation block of the cage and additional load, which intensifies the wear of the cage. Such a deteriorated cyclic effect may cause the cage fracture.

Cage material defects and riveting defects may cause cage fracture. The countermeasures are to strictly control in the manufacturing process. The invasion of foreign matters is a common mode of cage fracture failure. Due to the intrusion of foreign hard foreign matters, the wear of cage and abnormal additional load may also lead to cage fracture.

Poor lubrication mainly refers to that the shaft is in poor oil state, which is easy to form adhesive wear and deteriorate the working surface state. The tears caused by adhesive wear are easy to enter the cage, resulting in abnormal load on the cage, which may cause cage fracture.

Bearing plays an important role in the field of machinery. Bearing can not only be used in machinery, but also be made into some craft toys. Bearing has had a great impact on our life.

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