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Toroidal traction drive continuously variable transmissions (CVTs) for automobiles have adopted the latest automatic transmission technology, including torque converters, wet clutch systems and hydraulic systems. Therefore CVT fluids must function as conventional automatic transmission fluids as well as traction fluids. The performance of an automatic transmission fluid is mainly dependent upon the additive technology, while the traction performance and low-temperature viscosity are strongly dependent on the base fluid. Thus, the optimal traction fluid for automotive applications is a high-traction base fluid containing additives appropriate for conventional automatic transmission fluid. However, a higher traction tends to result in a higher low-temperature viscosity. In order to resolve this contradiction, several new traction base fluids with either two naphthene rings or a polycyclic structure hydrocarbon were synthesized. The carbon numbers of these base fluids are 14 to 18.

This paper describes a study of the effects of two cycle engine oil composition on biodegradability and engine performance. With increasing interest in environmental protection, it becomes important to develop an oil that would not harm the environment. Desirable requirement was the development of a biodegradable oil with performance suitable for outboard engines, motorcycles, chain saws, and all other types of two-cycle engines. In addition to biodegradability, two key points for the development of this oil were the selection of a base oil that provided outstanding thermal stability and the blending of ashless dispersants that offered excellent high-temperature cleanliness. The developed oil which is formulated with properly selected esters and dispersants showed better performance than current biodegradable oils in every practical use.

In addition to the performances of the ceramic materials themselves, development of joining technologies of ceramic wheels with metal shafts is very important for putting ceramic rotors into practical use. Though silicon nitride has excellent strength at high temperature and is best suited as the ceramic wheel material, the corresponding bonding technology for its use in turbo-chargers has not been totally successful to this point in time. This report presents the brazing technology of the ceramic rotors, which were successfully developed and first introduced into the market in 1985. Currently there are two types of ceramic rotors(Fig. 1) being manufactured using the same brazing technology as described herein. The major points are as follows: 1. A chemical bond has been developed as an approach for achieving the rotor's practical use. 2. Application of active brazing needed no standard metallizing process for bonding silicon nitride to the metal shaft. 3.