Several common types of rolling bearings with their own seals

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