What are the common types of self-contained seals for rolling bearings?

Structure, function, advantages and disadvantages: Non-contact steel dust cover sealing device is the most commonly used one. It is suitable for high speed, with proper sealing space, poor dustproof and anti-grease leakage performance.
Non-contact method: single lip seal
Structure, function, advantages and disadvantages: the combination of steel plate and rubber non-contact sealing device, the outer ring of the inner ring has a grooved spear and a sealing lip to form a labyrinth seal. It is suitable for high speed, suitable for sealing and occupying space, and its dustproof and anti-grease leakage performance is general.
Non-contact method: double lip seal
Structure, function, advantages and disadvantages: Non-contact double-shoulder sealing device with steel plate and rubber is the most commonly used one. The performance is similar to the RU type.
Contact method: radial seal
Structure, function, advantages and disadvantages: the combination of steel plate and rubber contact "B" -shaped sealing device, the single lip structure is the most commonly used one. High speed and dynamic performance are average, and other performance is better.
Contact method: axial seal
Structure, function, advantages and disadvantages: the combination of steel plate and rubber contact type sealing device, double lip structure, one lip and the inner ring outer diameter surface edge slightly contact, the other lip and the inner ring end face form a labyrinth seal. All performances are better.