double sealed ball bearings

Deep groove ball bearing with seals or shields

Single row deep groove ball bearings with seals or shields are particularly versatile, have low friction and are optimized for low noise and low vibration, which enables high rotational speeds. They accommodate radial and axial loads in both directions, are easy to mount, and require less maintenance than many other bearing types. The integral sealing can significantly prolong bearing service life because it keeps lubricant in the bearings and contaminants out.Integral sea

ling prolongs bearing service life

Simple, versatile and robust design

Low friction and high-speed capability

Accommodate radial and axial loads in both directions

Require little maintenance

Knowledge and introduction of bearings    :                                                                                                 

Double sealed ball bearings are a type of deep groove ball bearing that features two sets of seals on both sides of the bearing, providing enhanced protection against contaminants and lubricant leakage. Here's a detailed introduction to double sealed ball bearings:

1. Functionality:

• Double sealed ball bearings are designed to retain lubricant within the bearing and prevent contaminants such as dust, water, and other harmful particles from entering the bearing gap. This helps to extend the service life of the bearing and reduces the need for frequent maintenance .

2. Seal Types:

• Non-contact Seals (ZZ): These seals have a gap between the seal and the rotating inner ring, which reduces friction and allows the bearing to operate at higher speeds. However, they offer less protection against contaminants .

• Contact Seals (LLU): These seals have a direct contact with the inner ring, providing better sealing against contaminants but with slightly higher friction and lower speed capabilities compared to non-contact seals .

• Low Torque Seals (LLH): Similar to contact seals but with a specially designed lip to prevent foreign matter penetration and offer low torque operation .

• There are different types of seals used in double sealed ball bearings:

3. Performance:

• Double sealed ball bearings offer good performance in terms of dust proofing and water proofing. Non-contact seals provide better high-speed capabilities, while contact seals offer better sealing against contaminants .

4. Lubrication:

• Double sealed ball bearings are typically pre-lubricated with grease at the factory. The choice of grease is important for the bearing's performance and can be selected based on the operating conditions. For example, Timken uses Mobil Polyrex EM grease, which is suitable for a wide range of temperatures and provides protection against rust and corrosion .

5. Temperature Range:

• The allowable temperature range for double sealed ball bearings depends on the lubricant used. For instance, Mobil Polyrex EM grease allows operation from -29°C to 177°C .

6. Applications:

• Double sealed ball bearings are used in various applications where environmental protection is crucial, such as electric motors, automotive wheels, and industrial equipment where contamination or water exposure is a concern .

7. Maintenance:

• Due to the sealed nature of these bearings, they require less frequent relubrication and maintenance, which can be advantageous in hard-to-reach or inaccessible areas .

In summary, double sealed ball bearings offer a reliable solution for applications that demand protection from environmental contaminants while maintaining efficient operation. The choice between different seal types depends on the specific requirements for speed, torque, and sealing effectiveness.

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