| 摘要 |
PURPOSE:To reduce the formation of vapor and permit the superior injection by setting the ratio between the sum of the flow passage areas of two holes as the branched flow passages of a branched-flow member and the flow passage area of an injection hole into the range of a specific value. CONSTITUTION:A branched-stream member 8 onto which the flow passages for allowing the flow of fuel jetted from an injection hole 62 to branch-flow are formed is installed at the edge part of a body 6. The flow passage of the branched-flow member 8 is formed at the position corresponding to the injection hole 62, and the inlet for the fuel flow supplied from the injection hole 62 is formed in the form in which each part of two circles are superposed each other. The flow passage is branched as two holes 81 having each certain diameter, in a prescribed angle from the inlet in the branched-flow member 8, and opened at two positions at the edge part for the outer space. When the flow passage area of the injection hole is set S1, and the sum of the flow passage areas of two holes as the flow passages of the branched-flow member is set S2, the following relation between the surface areas S2/S1 is satisfied: 6<=S2/S1<=8.
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