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A structural one-part epoxy adhesive with excellent adhesive properties and durability was developed for aluminum alloy, which is regarded as a material suitable for reducing the body weight of automobiles. As a result of investigations of surface treatment, the oxide layer, surface finishing, and adhesion properties of aluminum alloy, it was found that adhesion durability varies widely depending on the surface condition of the aluminum alloy. It was also learned that by subjecting the aluminum alloy to surface treatments such as etching, adhesion durability was greatly improved. It is expected that the use of aluminum alloy in automobiles will become widespread in the future. Undoubtedly, these adhesion technologies will become an extremely effective technique for joining automotive body panels made of aluminum alloy.

The simulated calculation of a fuel injection system is now possible by the use of a computer. However, this calculation does not seem completely satisfactory. In the conventional methods of calculation, separate calculation equations must be used when a void (the absence of oil) occurs in the injection system. Furthermore, the boundary condition equations applied at both ends of a high-pressure pipe were believed to be inadequate. In this paper, several improvements are attempted. A quantity that varies from positive to negative value is used as the fundamental variable in the calculations. Also, experiments were made using a test apparatus with a transparent boundary part for both observation and measurement. Moreover, incorporating the fundamental variable, the boundary condition equations were made applicable both to the state of compression and a void condition.

Conventional analyses are concerned with an overflow type of pump. However, in this paper, the bypass control type of pump is analyzed, and this analysis includes a fuel tank, an oil pipe, and a feed chamber, which until now have scarcely been analyzed. The potential energy and fluid resistance of oil pipes are considered, and in the high-pressure pipe, the fluid resistance is considered. In conventional analyses, when a void appeared in the fuel injection system, it was necessary to substitute a different equation, and the treatment on the volume of void was believed to be unsatisfactory. In this paper, improvements on these points have been attempted. When simulating a fuel injection system, it is necessary to determine such physical characteristics as the compressibility of fuel oil, the specific weight of fuel oil, the sonic velocity of fuel oil, the flow coefficient, etc.