Date: 2013-08-22

SKF bearing non-contact seals

Commonly used non-contact seal gap seal, oil seals and labyrinth seal and other forms. Because of the gap, addition to the Slinger seal, non-contact seal for grease lubrication applications. To improve sealing reliability of seals can be combined.
　　Due to the non-contact type sealing devices seal service, in addition to the friction in the lubricant, it does not appear any other friction and, therefore, non-contact seals do not wear, use a long time does not produce significant temperature rise, could be applied to high speed. But sealing the gap can not be too large, otherwise the sealing effect is very poor.
　　SKF bearing part of the non-contact seals:
　　1. clearance seal: simple in structure, can meet the General conditions of the sealing requirements. Selection of gap e d ≤ 50mm,e=0.25~0.40mm;d>50mm,e=0.25~0.6mm.
　　2. grooved seals: the Groove fill grease made it difficult for dust intrusion, ring and spiral groove in two forms. Ring Groove 3. Slot width b=3~5mm; groove depth t=4~5mm.
　　3. the labyrinth seal: curved road after filling grease when maze, sealed its sealing effect of Groove. Radial and axial labyrinth seals can be divided into two forms. Radial and axial clearance of choice: 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.
　　4. diagonal labyrinth seal: for shaft deflection is large, the curve Road ramp with Center swing. Labyrinth seal diagonally in the curvature of the road fill grease good sealing effect can be achieved.
　　5. the stamped sheet steel seal: synthesis of labyrinth seal by pressed steel plates, pressed steel pieces must be combined with load on the shaft or on the casing, do not need to be axial fastening, simple structure. In pressed steel filling grease in the curvature of the road, which has good sealing effect.
　　6. the Slinger seal of oil lubrication, the shaft out of the Groove, or put a ring, radial outward to drain oil out through SKF bearing cap on the oil and the oil hole oil flow back into the tank. Can also be close to the bearing mounted a Slinger, this structure is often cracks and seals the joint.  

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