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In this study, we have developed two type of low friction seal rings (S/R). The first of developed product is textured seal ring. The surface textures with the side of seal ring are designed by using numerical analysis of hydrodynamic, and attempt to reduce the friction coefficient by lubrication improvement of sliding surface. Low friction effect is confirmed by friction torque and oil film thickness measurement, and it was discussed from analysis and experiments. The second is outer sliding type seal ring. This seal ring is unaffected by the environmental factors, it is possible to a pressure-receiving area reduction by changing the sliding surface from the side to the outer. Friction characteristics and sealing performance have been evaluated by the sliding test. Also both developed seal rings were confirmed that the low-torque effect compared to conventional one (T-shaped cross section seal ring) is obtained.

The conversion of a structural or non structural component to a different material such as magnesium, involves proper knowledge of the operating conditions, material properties, as well as the manufacturing processes. The present paper addresses some design aspects related to components produced using the high pressure die casting process. Simply converting from an aluminum die casting alloy to a magnesium alloy using an existing tool may appear very attractive to designers in the first place due to the apparent cost savings and short transition time involved. Although one can not generalize that this procedure is common practice, it is being employed. However, the final product may not represent an optimized design considering weight reduction and structural performance requirements. When directly converting a component to a new material, some design specifications and operating conditions may inadvertently be overlooked.