What is the difference in structure between waterproof bearings and ordinary bearings?

What is the difference in structure between waterproof bearings and ordinary bearings?

The main differences in structure between waterproof bearings and ordinary bearings include sealing design, material selection, and lubrication methods. ‌

Sealing design: Waterproof bearings usually have a sealing ring fastened between the inner and outer rings on one or both sides of the bearing. The inner side of the 

sealing ring is in the shape of a ring groove, and a spring ring is fitted on the wall of the sealing ring groove near the inner ring of the bearing. This design provides 

better sealing for waterproof bearings, effectively preventing water or dirt from entering the interior of the bearing and protecting lubricating grease and rolling 

elements. In contrast, ordinary bearings have poor sealing performance and are easily affected by external environments.

Material selection: Waterproof bearing materials usually have better corrosion resistance and wear resistance, and commonly used materials include stainless steel 

or plastic. These materials can effectively resist moisture and corrosion, extending the service life of bearings. However, ordinary bearings often use ordinary steel, 

which may rust when exposed to moisture.

Lubrication method: Waterproof bearings are generally designed with a closed lubrication system, where the grease stays inside the bearing for a longer period of 

time, reducing the need for regular lubrication. Ordinary bearings require regular addition of lubricating oil to maintain their normal operation.

Structural complexity: Due to the need for good sealing and water resistance of waterproof bearings, their internal structural design may be more complex than 

ordinary bearings.