| 摘要 |
<p>PURPOSE: To surely provide fixed connection over a long period by forming a press head park of a point end spherical press seat surface, annular flange part providing a space in an axial center direction from the seat surface to come into contact with a built in rout and a conical surface continued to the seat surface to the annular flange part to be tapered toward the point end. CONSTITUTION: By any cause, when a branch pipe 3 is tilted a little and eccentrically placed from a direction of the axial center (x), by tightening torque through screwing a tightening nut 5, an annular flange part 3' is pressed, to slide a spherical surface of a press head part 6 in a rotational surface of a pressure receiving seat surface 2 before a surface pressure in a seal surface rises, consequently by correcting tilting the branch pipe 3 and its eccentricity to a prescribed position, a uniform surface pressure in the seal surface is obtained to perform sure supply of superhigh pressure fuel without causing a leak of fuel. Since a radius of curvatureθof a seat surface 6' in the press head part is set to a value represented by a formula o.4D<=γ<=10D relating to a diameter D of the branch pipe 3, the press head part 6 comes into opposed contact in an optimum range relating to pressure receiving seat surface.</p> |
