| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve both of atomization of fuel spray and suppression of attachment of fuel to an inner wall surface of an intake port by combining enhancement of atomization of the injected fuel, and narrow-angle of spray shape, and high penetration.SOLUTION: An axial center of an injection hole from an inlet center of the injection hole 5 toward an outlet center of the injection hole 5 in vertically projecting each injection hole 5 to a plane orthogonal to a valve seat axial center 3c, is inclined at an inward angleβto a direction of a central axis 21a of aggregate spray, with respect to a radial straight line 19 from the valve seat axial center 3c toward the inlet center. Further in each injection hole group 5a, an inward angleβ1 of a central injection hole 5-1 positioned at a central portion of the injection hole group 5a is smaller than an inward angleβ2 of each end injection hole 5-2 positioned at both end portions of the injection hole group 5a. Further a diameter of the central injection hole 5-1 is larger than a diameter of each end injection hole 5-2.</p> |
