| 摘要 |
PROBLEM TO BE SOLVED: To provide an injector for a fuel injection device of high functionality and low cost by compatibly materializing improvement of sealing performance and workability of an adhesion end surface of a plurality of body members. SOLUTION: Part of an upper end surface of a valve body B3 constructing the injector I is dug down to form a recess part 81 having a roughly circle outer shape and to open a low pressure passage 35 on the recess part 81. An annular groove 82 is formed on a lower end surface of a plate member B2 to almost overlap an outer circumference edge of the recess part 81. When the plate member B2 and the valve body B are butted, the outer circumference edge part of the valve body B3 and sealing surfaces 91, 92, and a flat surface of the plate member B2 adhere, the recess part 81 and the annular groove 82 communicate and a small space part surrounding a high pressure introducing passage 2 and a control pressure chamber 51 with a predetermined interval is formed. Predetermined bearing pressure is secured by the small space part and the small space part can function as a leak fuel passage. COPYRIGHT: (C)2006,JPO&NCIPI
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