What is the difference between sealed deep groove ball bearings and open ones?

There are significant differences in design and application between sealed deep groove ball bearings and open deep groove ball bearings.

Sealed deep groove ball bearings are usually equipped with rubber or metal sealing rings, which can effectively seal the inside of the bearing to prevent grease leakage and external dust and moisture from entering. This design extends bearing life and is especially suitable for dusty, high-humidity or corrosive environments. Because the inside of the bearing is relatively closed, sealed bearings are usually more effective at maintaining good lubrication, reducing friction and wear, while also limiting the loss of lubricant.

In contrast, open deep groove ball bearings have no external seals or dust covers, leaving the rolling elements and lubricant inside the bearing exposed to the outside environment. This design makes the bearings easier to lubricate and maintain, but also makes the bearings susceptible to external contaminants, which may shorten the bearing's life or require more frequent maintenance. Open bearings are typically used in environments with higher levels of cleanliness or where frequent lubrication and maintenance are required.

In terms of operating characteristics, slightly more friction and heat may be generated due to the encumbrance of the sealed bearing design, which may affect its maximum operating speed. Open bearings may have a slightly higher maximum operating speed due to the lack of sealing structure limitations. However, open bearings operating in contaminated environments require more frequent cleaning and maintenance to ensure proper operation and long-term reliability.

Therefore, the choice of sealed or open deep groove ball bearings depends on the specific application requirements, especially considering the cleanliness and contamination level of the working environment and the frequency of bearing maintenance requirements. Sealed bearings are suitable for harsh working environments that require long-term stable operation and less maintenance, while open bearings are more suitable for environments with higher cleanliness requirements or frequent maintenance.