However, due to the difficulty of processing and production cost, the sealing groove of the bearing ring is generally no longer processed after turning and heat treatment. 2, the structure in Fig. The inner ring of the bearing has a sealing groove. The sealing structure shown in Figure 1 belongs to a sealing groove contact type sealing structure. The difference from the groove contact seal structure in Fig. However, due to the simple processing of the dust cover and the low gap cost, the cost is about 70% of the nitrile rubber seal, so it is often used in some occasions where the sealing requirements are not high. If the sealing effect of the outer lip of the sealing ring is considered, it can also be called a three-lip or multi-lip seal. 4 is a non-contact rubber sealing structure.
The fit interference mentioned here is a key technical parameter that not only affects the anti-leakage and sealing performance of the bearing, but also affects the size of the friction torque. Therefore, the non-contact dust cover sealing structure with the lowest production cost is generally adopted (as shown in Figure 5). The seal structure in Figure 2 belongs to the inner and outer diameter contact seal structure.
Equipped with a labyrinth sealing structure with a long sealing circuit, such as the light-contact type Figure 1 structure or the non-contact type Figure 4 sealing structure. But the advantage is that the outer diameter of the inner ring can be grinded to greatly improve the dimensional processing accuracy and reduce the roughness, and this sealing structure is sealed through the contact of the sealing ring lip with the outer diameter of the inner ring, and is not normally sealed The influence of the axial positioning of the ring has nothing to do with the machining accuracy of the axial dimension of the seal groove of the outer ring of the bearing. Compared with the groove contact sealing structure of Fig.
The sealing ring and the sealing groove form a labyrinth shape. 5 is the same non-contact sealing structure as the structure of Fig. Such as motorcycle wheel bearings, washing machines, water pumps and other home appliance motor bearings are greased, which require high dustproof, waterproof, and greaseproof requirements. Therefore, it is generally ensured that the radial direction has a better contact state, and the axial direction allows non-contact state. Luxury ceiling fan motor bearings are the ones with the lowest requirements for sealing performance among the above-mentioned types of bearings. Because the 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 Wheel Bearings factory the low speed, it is normal The work is generally only a few hundred revolutions per minute, and the centrifugal force of the grease is very small, which is not easy to cause grease leakage
Tags: Wheel Bearings factory
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