| 摘要 |
PROBLEM TO BE SOLVED: To provide an injector which reduces the rate of change of a fuel injection amount even if the contact part of a valve member is worn, in a structure where the contact part of the valve member is seated on the conical surface of a valve body in a protruded curved shape. SOLUTION: The valve body 12 comprises, on an inner peripheral wall, the conical surface 13 reduced in diameter toward an injection hole 14 side in fuel flow direction. The valve member 20 comprises, at the injection hole 14 side end part, the contact part 21 seated on the conical surface 13. The contact surface of the contact part 21 seated on the conical surface 13 is formed in the protruded curved shape 22 forming a part of a spherical surface. The center O of the radius r of the protruded curved shape 22 is positioned on the side of the valve member 20 apart from the center axis 100 thereof as viewed from the contact position of the protruded curved shape 22 coming into contact with the conical surface 13. The radius of the protruded curved shape 22 of the contact part 21 is not determined by a seat diameter ds and the seat angleθof the conical surface 13, and the radius center is set larger than the spherical surface on the center axis 100. A cylindrical surface 23 is extended from the end of the protruded curved shape on the upstream side of fuel to an anti-injection hole side along the center axis 100 of the valve member 20. COPYRIGHT: (C)2004,JPO
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