| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fuel injection nozzle capable of suitably improving a property of a fuel spray injected under extremely low pressure in pilot injection and initial injection, when a flow mode of fuel changes in response to a needle lift quantity. Ž<P>SOLUTION: This fuel injection nozzle 1 has a nozzle body 2 provided with a sack part 26 of a semispherical surface shape and a nozzle port 27 communicating with the sack part 26, and a needle 3 freely slidably stored in the nozzle body 2. A first chamfer part R1 is formed in an upstream side part positioned on the upstream side of a fuel flow out of an inlet of the nozzle port 27, and a second chamfer part R2 having a curved surface radius smaller than the first chamfer part R1, is formed in a downstream side part positioned on the downstream side of the fuel flow out of the inlet of the nozzle port 27. The nozzle port 27 is arranged so that the downstream side part becomes an upper end part of the sack part 26. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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