| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel injection nozzle 1 capable of improving the concentricity of a valve body 2 and a needle 3. SOLUTION: The needle 3 is slidably supported on an inner circumference surface of a center hole 9 at a longitudinal direction center part 3a thereof, and an upper end part (needle head 3b) is slidably inserted in an inner circumference of a cylinder 4. The cylinder 4 is slidably inserted in an upper end part inner circumference of the center hole 9 with keeping minute clearance, and is pressed against a lower end surface of a plate 7 by being energized by a spring 5 to form a pressure control chamber 16 between the lower end surface of the plate 7 and an upper end surface of the needle head 3b. Consequently, the concentricity of the valve body 2 and the needle 3 can be improved since the needle head 3b can be positioned in a radial direction in relation to the valve body 2 via the cylinder 4 and also an intermediate part 3b of the needle 3 can be positioned in the radial direction in relation to the valve body 2. COPYRIGHT: (C)2008,JPO&INPIT
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