-Contacting seal is the seal of their relative motion part touch and has no gaps sealed. Placing soft material within the SKF bearings cap direct contacts with the axis of rotation from the role. The seal due to direct contact seal and fit, large friction at work, heat, cause poor lubrication, contact surface wear, resulting in the sealing effect and performance degradation. Therefore, it applies only to working conditions of medium and low speed. -Contacting seal commonly used blankets to seal, Cup seals and other structural forms, apply to different occasions. According to SKF bearing working conditions and working environment on the degree of sealing requirements, design is often integrated use of various seal types in order to achieve better seal effect. -Contacting seal has a thin blanket of soft materials, rubber, leather, Cork and other; or placing good wear resistance of rigid material (such as strengthening graphite, bronze, cast iron, etc) direct contact with the axis of rotation for sealing. Here are several common structure:
In SKF bearing cover Shang issued trapezoid slot, will fine blankets by standard made ring (size is unlikely to Shi) or with shaped (size larger Shi), placed in trapezoid structure in the to and axis key collection contact, or in SKF bearing cover Shang opened gap placed felt ring oil seal then with also a parts pressure in felt ring oil seal Shang, to adjustment blankets and axis of key collection degree, thus improve sealed effect. This sealed structure is simple, but friction is large, sliding speed is less than 4m/s~5m/s-only place. Shaft surface in contact with felt ring seals such as when polished and high quality blankets, available to the sliding velocity up to 7m/s~8M/s points.
Lip seal in the SKF bearing cap, place a lip seal rings made with oil-resistant rubber, lived on bend elastic rubber ring and attach the spiral spring coil fastened and tight on the shaft, so that role. Lip seal installed in a steel casing, and cover more precisely assembled. Lip type seal ring direction towards the sealed parts of the sealing lip. That if main is to seal oil, sealed lip should with SKF bearing (towards within); if main is to prevent outside real immersed, is sealed lip should carrying SKF bearing (towards outside), if two a role are to has, best using sealed lip reverse placed of two a lip shaped sealed ring, it available to contact surface sliding speed is less than 10m/s (Dang axis neck is fine car of) or is less than 15m/s (Dang axis neck is polished of) Department. Axis shall be the best contact with the lip type seal ring after hardening of the Department, to enhance the wear resistance.
Sealing ring is a ring with a gap seals within the ring groove, putting it in the sleeve, sleeve and Groove turning, seal ring gap is reached the elasticity after arriving in tight hole on the wall of the static, you can play the role of sealing. Various hardened and polished contact surfaces are required. Seal rings manufactured with wear resistant White cast iron containing chromium, sliding speed is less than 100m/s can be used at all. In the context of sliding speed of 60M/s~80m/s, bronze manufacture seal rings can also be used.
Non-contact seal is the seal does not contact its relative motion of the parts, and have appropriate clearance seal. Use-contact seals, always sliding friction at the contact. Using non-contact seal, will be able to avoid this drawback. This form of seal, almost no friction heat generated in the work, no wear, especially suitable for high speed and high temperature applications. Commonly used are non-contact seal gap, maze and washers-various different structural forms, respectively, applied to different occasions. Non-contact sealing of gaps as small as possible is preferred.



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