What is the seal types of sealed rolling bearing?

The role of the sealing of sealed rolling bearing:
1) Prevent the loss of internal lubricant;
2) Prevent the intrusion of external dust, moisture and impurities

Types of sealed rolling bearing seals: 1) contact seal; 2) non-contact seal; 3) combined seal.

A. Contact seal-suitable for low speed, in order to prevent wear, the surface roughness of the contact is required to be less than R1.6 ～ 0.8

sealed rolling bearing Seals and shafts are in direct contact with the felt ring sealing characteristics: simple structure, low price but easy to wear Application: v <= 4-5m / s, the sealing performance of the leather cup in grease lubrication occasions with low working temperature: the effect is better than the felt ring Standard parts, high-speed and easy to heat applications: n Low, low temperature working grease or oil lubrication occasions Place a lip seal ring made of oil-resistant rubber in the bearing cover, relying on the elastic force of the bent rubber With the tightening effect of the additional ring-shaped coil spring, it is tightly sleeved on the shaft so as to play a sealing role.

The direction of the sealing lip of the lip-shaped sealing ring should be toward the sealing part. That is, if the main purpose is to sealed rolling bearing seal the oil, the sealing lip should face the bearing (inward); if the main purpose is to prevent foreign objects from entering, the sealing lip should face away from the bearing (outward); if both are required, it is best to use Two lip-shaped sealing rings with sealing lips placed in reverse. sealed rolling bearing Lip seals can be used in applications where the sliding speed of the contact surface is less than 10m / s (when the journal is refined) or less than 15m / s (when the journal is polished).

B. Non-contact seal: use a small gap filled with grease to play a sealing role combined seal.

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