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A trend in automotive parts development is the pursuit of long life, high quality and reliability. The increase in service life of automotive wheel bearings, by improving the rolling contact fatigue (RCF) life of bearing steels, was investigated. Conventional studies of bearing steels and heat treatments have dealt with quenching and tempering (Q/T) in 52100 steel. This study is a new trial to increase the strength of bearing steels by special austempering in phases after general Q/T heat treatments.

The idle vibration of steering system should be improved for better N.V.H performance of vehicles. The fundamental solution for the idle vibration is the separation of steering column frequency from resonance of body structure. Therefore, design of high stiffness steering system is very important. In this paper, design process for high stiffness steering system using light weight magnesium alloy and final results improved about 10 dB level are presented.