| 摘要 |
PROBLEM TO BE SOLVED: To weaken a collision of an opening and closing valve at the time of low fuel pressure and to prevent deformation and damage of the opening and closing valve and a valve seat. SOLUTION: In this injector having a valve spring 11a for pressing an opening and closing valve 11 to a valve seat 22 demarcating an outlet 12a of a leak hole 12 of a pressure control chamber 10, and a spring seat 33 for supporting the pressing reaction force of the valve spring on the opposite side to the outlet of the leak hole, the spring seat is movable in the elongation and shrinkage direction of the valve spring, and the position is switched to plural positions. The position of the spring seat is changed to vary the spring force, whereby at the time of low fuel pressure, the spring force is lowered to weaken a collision of the opening and closing valve and the valve seat at the time of injector valve closing, thereby preventing deformation and damage.
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