| 摘要 |
PROBLEM TO BE SOLVED: To reduce a stress in a communication part with a communication hole in the inner wall of a main pipe hole in a delivery pipe communicating the main pipe hole and an injector fitting part with the communication hole. SOLUTION: The cross sectional shape of the main pipe hole 11 is set to an approximately elliptical shape where a major diameter shaft 11L and a minor diameter shaft 11S cross at right angles with each other. The main pipe hole 11 is set to approximately elliptical so that the extensional deformation in the major diameter direction of the inner wall of the main pipe hole 11 is suppressed and the stress in the communication part with the communication hole 18 is reduced. |
