Nixon & Vanderhye P.C.
Fuel injection device
In an injection hole set, primary and secondary injection holes are formed to satisfy the following relationship: γ≤θt1+θt2−0.87×P{circumflex over ( )}0.52, where γ (deg) is an injection-hole-to-injection-hole angle, which is an angle formed between a primary central axis of the primary injection hole and a secondary central axis of the secondary injection hole; θt1 (deg) is a primary taper angle, which is an angle formed between outlines of a primary injection hole inner wall of the primary injection hole in a cross section of the primary injection hole inner wall; θt2 (deg) is a secondary taper angle, which is an angle formed between outlines of a secondary injection hole inner wall of the secondary injection hole in a cross section of the secondary injection hole inner wall; and P (MPa) is an average pressure of the fuel in a fuel passage at a time of injecting the fuel from the injection holes.
DENSO CORPORATION
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Noritsugu
Kato