Fuel injection valve
A technology of fuel injection valve and fuel, which is applied in the direction of fuel injection device, special fuel injection device, charging system, etc. It can solve the problem of shrinking cavity flow path area, achieve the effect of increasing the degree of freedom and promoting atomization
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Example Embodiment
[0034] Embodiment 1
[0035] figure 1 Is a cross-sectional view along the axis of the fuel injection valve according to the first embodiment of the present invention. figure 1 The upper end of the fuel injection valve flows downward. In the figure, a cylindrical fixed iron core 2 is fixed to the upper end of the magnet tube 1. The magnetic tube 1 and the fixed iron core 2 are coaxially arranged. The magnet tube 1 is pressed into the downstream end of the fixed iron core 2 and welded.
[0036] A valve seat 3 and an orifice plate 4 are fixed at the lower end of the magnetic tube 1. The nozzle plate 4 is provided with a plurality of nozzle holes 5 for injecting fuel. The nozzle hole 5 penetrates the nozzle hole plate 4 in the plate thickness direction.
[0037] The orifice plate 4 is inserted into the magnet tube 1 in a state of being fixed to the downstream end surface of the valve seat 3 by the first welding part 4a, and then fixed to the magnet tube 1 by the second welding part 4...
Example Embodiment
[0072] Embodiment 2
[0073] Next, Image 6 It is a cross-sectional view of the valve seat 3, the nozzle orifice plate 4, and the valve ball 6 of the fuel injection valve according to the second embodiment of the present invention and a plan view showing the central part of the nozzle plate 4 (viewed from the valve ball 6 side along the arrow VI The figure of the part exposed in the fuel flow path) the figure shown in combination, Figure 7 Is to Image 6 An enlarged cross-sectional view of part Ⅶ, Figure 8 Is to Image 6 The enlarged top view of section VIII.
[0074] In the first embodiment, the convex portion 4c is provided in the center of the nozzle orifice plate 4, while in the second embodiment, the center of the nozzle orifice 4 is flat. In addition, in the second embodiment, the tip portion of the valve ball 6 is provided with a flat portion 6b parallel to (or substantially parallel) to the injection orifice plate 4. The flat portion 6b faces the center of the upstream e...
Example Embodiment
[0080] Embodiment 3
[0081] Next, Picture 9 It is an enlarged cross-sectional view showing the injection hole 5 of the fuel injection valve according to Embodiment 3 of the present invention. In the third embodiment, in the flow path of the injection hole main body 5a, a cylindrical portion 5f having the smallest cross-sectional area is provided between the inlet and the outlet of the injection hole main body 5a. The other structure is the same as the first embodiment.
[0082] In such a fuel injection valve, since the flow rate of the fuel in the nozzle hole 5 depends on the cross-sectional area of the cylindrical portion 5f, the flow rate deviation caused by the position deviation of the nozzle hole main body 5a and the large diameter portion 5b can be suppressed.
[0083] The injection hole main body 5a of the second embodiment may be provided with a cylindrical portion 5f. That is, Embodiments 2 and 3 can be combined.
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