At present, deep groove ball bearings used in motorcycles, home appliances motors and luxury ceiling fans industries usually design different sealing structures according to the mounting position or working conditions of the bearing.

For example, the single-sided sealed motorcycle engine case bearing is lubricated by splash lubrication by the engine oil in the engine when the engine is working. This splash lubrication method not only forms a certain oil pressure in the engine cavity and the bearing cavity, but also has a certain flow speed of the oil, which is not conducive to the anti-leakage seal of the bearing. Therefore, the requirements for the anti-leakage sealing performance of this type of bearing are very high, and the bearing must adopt a contact seal structure.

Comparing the groove contact sealing structure and the inner and outer diameter contact sealing structure, due to the following four advantages of the structure: (1) The inner ring has no sealing groove, and the processing cost is lower; (2) The sealing ring lip and the ground inner and outer Diameter fit interference is smaller; (3) The friction torque is smaller under the same sealing effect; (4) Under the same friction torque and the same oil pressure inside the seal ring, the contact surface of the seal ring lip and the inner ring is not easy Disengagement, which is very beneficial for sealing under pressure on the inside of the bearing seal ring.

Therefore, it is more common for motorcycle engine box bearings to adopt inner and outer diameter contact sealing structures. The fit interference mentioned here is a key technical parameter that not only affects the oil leakage and sealing performance of the bearing, but also affects the size of the friction torque.

Such as motorcycle wheel bearings, washing machines, water pumps and other home appliance motor bearings are lubricated with grease, which requires higher requirements in terms of dustproof, waterproof and greaseproof, so contact seal structures are generally used. However, because the sealing performance requirements of motorcycle engine bearings are not so high, the matching interference between the sealing ring lip and the inner ring is relatively small, especially for home appliance motor bearings, in order to minimize the friction torque of the bearing , To reduce the vibration, noise and temperature rise of the bearing, the interference is generally small, and it is often called the light contact seal structure at this time.

Industrial sewing machine bearings are also lubricated with grease, and there are no special requirements for oil and water resistance. However, due to the problem of more dust in the installation environment of the bearing and the use environment of the sewing machine, the dustproof and sealing performance of the bearing is relatively high. It is equipped with a labyrinth sealing structure with a long sealing circuit, such as a light contact structure or a non-contact sealing structure.

Luxury ceiling fan motor bearings are the ones with the lowest requirements for sealing performance among the above-mentioned types of bearings. Because luxury ceiling fans are installed in the home, the working environment is better, and the requirements for dust and water resistance are not high; at the same time, due to the low speed The work is generally only a few hundred revolutions per minute, and the centrifugal force on the grease is very small, which is not easy to cause grease leakage. Therefore, the non-contact dust cover sealing structure with the lowest production cost is generally adopted.

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