Double-sided bearing with seal can not only save grease, but also prevent dust and other impurities from entering the bearing and keep the rollers rotating in a clean environment. This kind of bearing is mainly used in the use of poor environment, inconvenient repair and maintenance occasions.

Dustproof cover is pure metal sheet stamping parts, generally fixed on the outer ring, and the inner and outer diameter of the inner ring has a proper gap, not allowed to contact the cage in the bearing.

Now the commonly used structural form is the roll edge type dustproof cover. After the bearing is filled with grease, the dustproof cover is pressed. The dustproof cover is fixed in the tooth of the outer ring by mold deformation. The general dust cover can no longer be removed after being pressed. If you take it off, the dust caps will be useless. Because there is a gap between the inner diameter of the dustproof cover and the inner ring of the bearing, the grease can not be completely sealed in the bearing, nor can it be too small dust or foreign matter in the outside, so the sealing effect is smaller. Because the dust cover is pressed in the bearing, the dust cover will rarely fall off, the sealing structure is firm, and the heat dissipation is better than the contact seal.

Bearing seal ring form is more, the most common is a steel plate strengthened rubber seal form (skeleton type), divided into contact and non-contact type. Non-contact sealing ring and dust cover sealing form is similar, the inner diameter of the sealing ring and the outer diameter of the bearing inner ring have the appropriate clearance amount, can prevent most of the grease leakage and large particles of dust into the bearing; Contact sealing ring, as the name implies, is the inner diameter of the sealing ring has contact with the outer diameter of the inner ring. This way can effectively prevent the leakage of grease and prevent the external dust and liquid from entering the bearing, but because there is contact, it will produce some heat and will wear seriously.

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