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Under high-temperature conditions, the piston pin is subjected to significant cyclic impact loads. Moreover, because the piston pin swings only through a small angle within the pin bore, it is difficult to form a stable lubricating oil film, resulting in poor lubrication. Consequently, the piston pin must possess adequate stiffness, strength, and wear resistance. Its mass should be kept as low as possible, and the fit between the pin and the pin bore should provide an appropriate clearance while ensuring excellent surface quality. In general, the stiffness of the piston pin is particularly critical; if the pin bends or deforms, it may lead to damage to the piston pin seat.

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　　Under high-temperature conditions, the piston pin is subjected to significant cyclic impact loads. Moreover, because the piston pin swings only through a small angle within the pin bore, it is difficult to form a lubricating oil film, resulting in poor lubrication. Consequently, the piston pin must possess adequate stiffness, strength, and wear resistance. Its mass should be kept as low as possible, and the fit between the pin and the pin bore should provide an appropriate clearance while ensuring good surface quality. In general, the stiffness of the piston pin is particularly critical; if the pin bends or deforms, it may lead to damage to the piston pin seat.

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