| 摘要 |
PROBLEM TO BE SOLVED: To excellently atomize fuel even at either of full load time and partial load time by forming an inner hole of a jet needle in a taper shape whose diameter expands toward the input side from the protrusively exposed side of the jet needle. SOLUTION: An inner hole 10 of a jet needle 4 opens only on the lower end side being the needle jet side. This inner hole 10 is formed in a taper shape so that a diameter expands toward the input side from the protrusively exposed side of the jet needle 4. An angelθof a gradient of the inner hole 10 is properly set according to specifications or the like of an engine. Plural nozzles 2 are vertically arranged in a row along a peripheral wall of the jet needle 4 in the intake air passage downstream. Therefore, fuel taken in the inner hole 10 increases quadratic curve-like as throttle opening becomes large. Therefore, even when a throttle is fully opened, a sufficient quantity of fuel can be taken in the lower end of the inner hole 10.
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