| 摘要 |
PROBLEM TO BE SOLVED: To prevent the undesired opening/closing actions of a valve by the fuel pressure near the valve opening pressure in the valve structure of an electronic unit injector. SOLUTION: This valve structure is provided with a main body. A conical face 412 is provided on a bore, and the conical face 412 is extended at the first acute angle 463 against the axis 27. A needle valve is provided with a steam section 433 and a head section 435, the head section 435 is provided with the first conical face 465 expanded outward in the axial direction from the stem section 433 at the second acute angle 467 larger than the first acute angle 463, and the first conical face 465 is terminated by the first edge 469 having the diameter sealably coupled with the conical face 465 when the needle valve is closed. The head section 435 is provided with the second face terminated by the second edge 477 extended outward in the axial direction from the first edge 469 and having the diameter larger than the diameter of the first edge 469, and the head section 435 is also provided with a conical face extended outward in the axial direction from the second edge.
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