| 摘要 |
A fuel delivery pipe capable of reducing a pressure pulsation at the time of a fuel injection due to injection nozzles, preventing vibrations and noises at an underfloor pipe arrangement, and turning down a radiate sound from the fuel delivery pipe, wherein a flexible absorbing wall surface 10 formed on a wall surface of a fuel delivery body 1 is loosened due to internal pressure changes to render internal volume of the fuel delivery body 1 increasable, alpha<SUB>L</SUB>/{square root}{square root over (V determined by sonic speed alpha<SUB>L </SUB>of fuel flowing through the fuel delivery body 1 and the internal volume V of the fuel delivery body 1 is set as 20x10<SUP>3</SUP>(m<SUP>-0.5</SUP>.sec<SUP>-1</SUP>)<=alpha<SUB>L</SUB>/{square root}{square root over (V<=85x10<SUP>3</SUP>(m<SUP>-0.5</SUP>.sec<SUP>-1</SUP>) while a ratio alpha<SUB>L</SUB>/alpha<SUB>H </SUB>of equivalent sonic speed alpha<SUB>H </SUB>in a high frequency area to the sonic speed alpha<SUB>L </SUB>of the fuel is set as alpha<SUB>L</SUB>/alpha<SUB>H</SUB><=0.7, and the cross section shape in a perpendicular direction to an axis of the fuel delivery body 1 is formed in a substantially double side concaved shape, a substantially flask shape, a substantially trapezoid shape, a substantially key shape, and a substantially goggles shape.
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