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Automobile's hub bearing seals are the key functional parts that are mounted to 4 driving shaft wheels to prevent muddy water and foreign substances that flow into the wheel bearing, which ensure air tightness of bearing parts and maximize driving efficiency through smooth operation. Especially, design structure of bearing seal, which is the core part of driving wheel, and abrasion characteristics of its rubber material have direct relationship with durability of driving wheel parts and driving efficiency. In this study, we modified the design for existing seal's lip area to minimize the maximum stress applied to bearing seal's lip area which will ensure seal's performance, and to improve durability. After this, we manufactured prototype and carried out seal's performance evaluation.

The possibility of applying two types of raw materials which have transition elements such as B and Nb was investigated to develop new bearings which have metallurgical characteristics and fatigue resistance enhanced for advanced automotive transmissions which are known to supply severe lubrication environments. Those results were compared with the results of typical low carbon chromium steel which is widely used for the automotive transmission. Thrust type rolling contact fatigue testers were used for the evaluation of fatigue life of steel grades, and each specimen was tested under clean and contaminated lubrication environment. As a result, the microalloyed forging steels have shown the behavior of stabilized austenitic grain superior to comparative grade at high temperature regions. On the other hand, the test steels have shown a large amount of non-metallic microscopic inclusion or carbide segregation on near surface below the flaking.