JP2015094243A - Nozzle plate fitting structure for fuel injection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nozzle plate fitting structure for a fuel injection device in which the number of manufacturing steps for the fuel injection device can be reduced and a manufacturing cost of the fuel injection device can be reduced.SOLUTION: A metallic valve body 5 formed with a fuel injection port 4 comprises a nozzle storing part 8 storing a nozzle plate 3 made of synthetic resin material and coinciding a center 22 of the nozzle plate 3 with a central axis 11 of the valve body 5; an extremity end surface 10 to which the nozzle plate 3 stored in the nozzle plate storing part 8 is abutted; and a caulking protrusion 15 for fixing the nozzle plate 3 against the extremity end side formed with the fuel injection port 4. The nozzle plate 3 is caulked and fixed under a state in which a spring acting part 16 is resiliently deformed at the extremity end side of the valve body 5 by the caulking protrusion 15, and a nozzle hole forming part 18 is always pushed against the extremity end surface 10 of the valve body 5 by a resilient force of the spring action part 16.

Description

  The present invention relates to a structure for mounting a nozzle plate for a fuel injection device (hereinafter abbreviated as “nozzle plate” as appropriate) used to atomize and inject fuel flowing out from a fuel injection port of a fuel injection device. is there.

  An internal combustion engine such as an automobile (hereinafter abbreviated as “engine”) mixes fuel injected from a fuel injection device and air introduced through an intake pipe to form a combustible air-fuel mixture. Qi is burned in the cylinder. In such an engine, it is known that the mixed state of the fuel and air injected from the fuel injection device has a great influence on the performance of the engine, and in particular, the atomization of the fuel injected from the fuel injection device is reduced. It is known to be an important factor that affects engine performance.

  Therefore, conventionally, as shown in FIG. 22, in the fuel injection device 100, a metal nozzle plate 103 is welded to a metal valve body 102 in which a fuel injection port 101 is formed, and is injected from the fuel injection port 101. The fuel atomization is promoted by injecting the fuel into the intake pipe through the nozzle hole 104 formed in the nozzle plate 103 (see Patent Documents 1 and 2).

JP 11-270438 A JP 2011-144731 A

  However, the conventional fuel injection device 100 performs welding using a masking jig in order to prevent welding spatter from entering the nozzle holes 104 of the nozzle plate 103 and blocking the nozzle holes 104 by welding spatter. It was difficult to perform welding efficiently. As a result, the conventional fuel injection device 100 has a large number of manufacturing steps, and it is difficult to reduce the manufacturing cost.

  Thus, the present invention provides a nozzle plate mounting structure for a fuel injection device that can reduce the number of manufacturing steps of the fuel injection device and reduce the manufacturing cost of the fuel injection device.

  As shown in FIGS. 1 to 21, the present invention provides a fuel injection device nozzle plate 3 mounting structure in which nozzle holes 7 for atomizing and injecting fuel flowing out from a fuel injection port 4 of the fuel injection device 1 are formed. It is about. In this invention, the metal valve body 5 in which the fuel injection port 4 is formed accommodates the fuel injection device nozzle plate 3 formed of a synthetic resin material, and the center of the fuel injection device nozzle plate 3. Nozzle plate housing portion 8 for aligning the center axis 22 of the valve body 5 with the central axis 11 of the valve body 5 and a nozzle plate support portion (to which the nozzle plate 3 for a fuel injection device housed in the nozzle plate housing portion 8 is abutted. A front end face 10) and a caulking portion (caulking projections 15, 32, 37, and a ring-shaped projection 41) for fixing the fuel injection nozzle plate 3 to the front end side where the fuel injection port 4 is formed. doing. In the nozzle plate 3 for the fuel injection device, the nozzle hole forming portion 18 in which the nozzle hole 7 is formed and the caulking portions (caulking projections 15, 32, 37 and ring-shaped projection 41) are plastically deformed. And a spring action portion 16 that is caulked and fixed in an elastically deformed state on the tip end side of the valve body 5. When the spring action portion 16 is elastically deformed and fixed to the distal end side of the valve body 5 by the caulking portions (caulking projections 15, 32, 37, and ring-shaped projections 41), The nozzle hole forming portion 18 is always pressed against the nozzle plate support portion (tip surface 10) of the valve body 5.

  According to the present invention, the nozzle plate for a fuel injection device is fixed to the distal end side of the valve body by plastically deforming the caulking portion of the valve body. Therefore, the present invention can reduce the number of manufacturing steps of the fuel injection device and the manufacturing cost of the fuel injection device, as compared with the conventional example in which the metal nozzle plate is welded and fixed to the tip of the metal valve body.

  According to the present invention, the nozzle plate for a fuel injection device has a spring action portion that is fixed to the distal end side of the valve body in a state of being elastically deformed by the caulking portion of the valve body. It is always pressed against the nozzle plate support part of the valve body by elastic force. Therefore, the present invention can absorb the manufacturing error of the nozzle plate for the fuel injection device and the valve body by the elastic deformation of the spring acting portion, and the difference in thermal expansion between the nozzle plate for the fuel injection device and the valve body is elastically deformed by the spring acting portion. The nozzle plate for a fuel injection device can be securely fixed to the tip end side of the valve body.

FIG. 2 is a diagram schematically showing a usage state of the fuel injection device 1. It is a figure which shows the attachment structure of the nozzle plate which concerns on 1st Embodiment of this invention. 2A is a front view of the front end side of the fuel injection device, and FIG. 2B is a side view of the front end side of the fuel injection device as viewed from the direction indicated by the arrow C1 in FIG. (C) is a front end side sectional view of the fuel injection device cut along the line A1-A1 of FIG. 2 (a), and FIG. 2 (d) is an enlarged view of a D1 portion of FIG. 2 (c). is there. It is a figure which shows the relationship between the nozzle plate which concerns on 1st Embodiment of this invention, and a valve body, and is a figure which shows the state before crimping and fixing a nozzle plate to a valve body. 3A is a front view showing the relationship between the front end side of the valve body and the nozzle plate, and FIG. 3B is a front view of the valve body viewed from the direction indicated by the arrow C2 in FIG. It is a side view which shows the relationship with a nozzle plate, and FIG.3 (c) is a side view which fractures | ruptures partially along the A2-A2 line of Fig.3 (a). It is a figure which shows the valve body which concerns on 1st Embodiment of this invention. 4 (a) is a front view of the valve body, FIG. 4 (b) is a side view of the valve body viewed from the direction indicated by arrow C3 in FIG. 4 (a), and FIG. 4 (c) is FIG. It is a side view of the valve body shown partially broken along the A3-A3 line of (a). It is a figure which shows the nozzle plate which concerns on 1st Embodiment of this invention. 5A is a front view of the nozzle plate, FIG. 5B is a side view of the nozzle plate viewed from the direction indicated by arrow C4 in FIG. 5A, and FIG. 5C is FIG. It is sectional drawing of the nozzle plate cut | disconnected and shown along the A4-A4 line of (a). It is a figure which shows the attachment structure of the nozzle plate which concerns on 2nd Embodiment of this invention. FIG. 6A is a front view of the front end side of the fuel injection device, and FIG. 6B is a side view of the valve body shown in FIG. 6A viewed from the direction of arrow C5. FIG. 6 is a side view partially broken along the line A5-A5 in FIG. 6A, and FIG. 6D is an enlarged view of a portion D2 in FIG. 6C. It is a figure which shows the relationship between the nozzle plate which concerns on 2nd Embodiment of this invention, and a valve body, and is a figure which shows the state before fixing a nozzle plate to a valve body. 7A is a front view showing the relationship between the front end side of the valve body and the nozzle plate, and FIG. 7B is a front view of the valve body viewed from the direction indicated by the arrow C6 in FIG. 7A. It is a side view which shows the relationship with a nozzle plate, FIG.7 (c) is a side view which fractures | ruptures partially along the A6-A6 line of Fig.7 (a). It is a figure which shows the attachment structure of the nozzle plate which concerns on 3rd Embodiment of this invention. 8A is a front view of the front end side of the fuel injection device, and FIG. 8B is a front side view of the front end side of the fuel injection device that is partially broken along the line A7-A7 of FIG. 8A. FIG. 8C is an enlarged view of a portion D3 in FIG. 8B. It is a figure which shows the relationship between the nozzle plate which concerns on 3rd Embodiment of this invention, and a valve body, and is a figure which shows the state before crimping and fixing a nozzle plate to a valve body. FIG. 9A is a front view showing the relationship between the distal end side of the valve body and the nozzle plate, and FIG. 9B is a partially broken view along the line A8-A8 in FIG. 9A. It is a side view. It is a figure which shows the valve body which concerns on 3rd Embodiment of this invention. 10 (a) is a front view of the valve body, and FIG. 10 (b) is a side view of the valve body partially broken along the line A9-A9 of FIG. 10 (a). It is a figure which shows the nozzle plate which concerns on 3rd Embodiment of this invention. 11 (a) is a front view of the nozzle plate, FIG. 11 (b) is a side view of the nozzle plate, and FIG. 11 (c) is cut along the line A10-A10 in FIG. 11 (a). It is sectional drawing of the nozzle plate shown. It is a figure which shows the attachment structure of the nozzle plate which concerns on 4th Embodiment of this invention, and is a figure which shows the modification of 3rd Embodiment. FIG. 12A is a front view of the front end side of the fuel injection device, and FIG. 12B is a front side view of the front end side of the fuel injection device shown partially broken along the line A11-A11 in FIG. FIG. 12C is an enlarged view of a portion D4 in FIG. 12B. It is a figure which shows the attachment structure of the nozzle plate 3 which concerns on 5th Embodiment of this invention, and is a figure which shows the modification of 3rd Embodiment. 13 (a) is a front view of the front end side of the fuel injection device, and FIG. 13 (b) is a front side view of the front end side of the fuel injection device shown partially broken along the line A12-A12 of FIG. 13 (a). FIG. 13C is an enlarged view of a portion D5 in FIG. 13B. It is a figure which shows the relationship between the nozzle plate which concerns on 5th Embodiment of this invention, and a valve body, and is a figure which shows the state before crimping and fixing a nozzle plate to a valve body. FIG. 14A is a front view showing the relationship between the front end side of the valve body and the nozzle plate, and FIG. 14B is a partially broken view along the line A13-A13 in FIG. It is a side view. It is a figure which shows the valve body which concerns on 5th Embodiment of this invention. FIG. 15A is a front view of the valve body, and FIG. 15B is a side view of the valve body partially broken along the line A14-A14 of FIG. 15A. It is a figure which shows the nozzle plate which concerns on 5th Embodiment of this invention. 16 (a) is a front view of the nozzle plate, FIG. 16 (b) is a side view of the nozzle plate, and FIG. 16 (c) is cut along line A15-A15 in FIG. 16 (a). It is sectional drawing of the nozzle plate shown. It is a figure which shows the relationship between the nozzle plate which concerns on 6th Embodiment of this invention, and a valve body, and is a figure which shows the state before crimping and fixing a nozzle plate to a valve body. FIG. 17A is a front view showing the relationship between the distal end side of the valve body and the nozzle plate, and FIG. 17B is a partially broken view along the line A16-A16 in FIG. It is a side view. It is a figure which shows the attachment structure of the nozzle plate which concerns on 6th Embodiment of this invention, and is a figure which shows the modification of 3rd Embodiment. 18 (a) is a front view of the front end side of the fuel injection device, and FIG. 18 (b) is a front side view of the front end side of the fuel injection device shown partially broken along line A17-A17 in FIG. 18 (a). 18 (c) is an enlarged view of a portion D6 in FIG. 18 (b). It is a figure which shows the attachment structure of the nozzle plate which concerns on 7th Embodiment of this invention, and is a figure which shows the modification of 6th Embodiment. FIG. 19A is a front view showing the relationship between the front end side of the valve body and the nozzle plate, and FIG. 19B is a partially broken view along the line A18-A18 in FIG. 19A. It is a side view. It is a figure which shows the relationship between the nozzle plate which concerns on 8th Embodiment of this invention, and a valve body, and is a figure which shows the state before fixing a nozzle plate to a valve body. FIG. 20A is a front view showing the relationship between the tip end side of the valve body and the nozzle plate, and FIG. 20B is a partially broken view along the line A19-A19 in FIG. It is a side view. It is a figure which shows the attachment structure of the nozzle plate which concerns on 8th Embodiment of this invention, and is a figure which shows the modification of 6th Embodiment. FIG. 21A is a front view of the front end side of the fuel injection device, and FIG. 21B is a front side view of the fuel injection device partially broken along the line A20-A20 of FIG. 21A. FIG. 21 (c) is an enlarged view of a portion D7 in FIG. 21 (b). It is a front end side sectional view of a fuel injection device showing the attachment structure of the conventional nozzle plate.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[First Embodiment]
(Fuel injection device)
FIG. 1 is a diagram schematically showing a use state of the fuel injection device 1 (see FIG. 2). As shown in FIG. 1, a port injection type fuel injection device 1 is installed in the middle of an intake pipe 2 of an engine, injects fuel into the intake pipe 2, and introduces air and fuel introduced into the intake pipe 2. To form a combustible mixture.

  FIG. 2 is a view showing the front end side of the fuel injection device 1 to which the fuel injection device nozzle plate 3 (hereinafter abbreviated as a nozzle plate) is attached.

  As shown in FIG. 2, in the fuel injection device 1, a nozzle plate 3 made of a synthetic resin material is attached to the distal end side of a metal valve body 5 in which a fuel injection port 4 is formed. In the fuel injection device 1, the needle valve 6 is opened and closed by a solenoid (not shown). When the needle valve 6 is opened, fuel in the valve body 5 is injected from the fuel injection port 4. The fuel injected from the port 4 passes through the nozzle holes 7 of the nozzle plate 3 and is injected outside. The nozzle plate 3 is injection molded using a synthetic resin material such as PPS, PEEK, POM, PA, PES, PEI, and LCP.

(Nozzle plate mounting structure)
Hereinafter, based on FIG. 2 thru | or FIG. 5, the attachment structure of the nozzle plate 3 which concerns on this embodiment is demonstrated.

  As shown in FIGS. 2 to 4, the valve body 5 has a circular shape when viewed from the front side, and a nozzle plate accommodating portion 8 for accommodating the nozzle plate 3 is formed on the distal end side. The nozzle plate housing portion 8 includes four circular arc walls 12 formed at equal intervals along the outer peripheral edge of the distal end surface 10 of the valve body 5 (around the central axis 11 of the valve body 5), and this adjacent circle. And an anti-rotation groove 13 formed between the arcuate walls 12 and 12.

  As shown in FIGS. 3 and 4, the arc-shaped wall 12 accommodates the arm portion 14 of the nozzle plate 3 on the radially inner side. The arcuate wall 12 is formed such that the protruding height from the tip surface 10 (nozzle plate support portion) of the valve body 5 is smaller than the plate thickness of the nozzle plate 3. Further, each arcuate wall 12 is integrally formed with a caulking projection (caulking portion) 15 at an end portion of the anti-rotation groove side 13.

  As shown in FIGS. 3 and 4, the caulking protrusion 15 is circular so that the protrusion height from the tip surface 10 of the valve body 5 is larger than the plate thickness of the nozzle plate 3 and a sufficient caulking allowance is generated. It is formed integrally with the arcuate wall 12. Further, as shown in FIG. 2, the caulking protrusion 15 is bent (plastically deformed) toward the anti-rotation groove 13, whereby the spring action portion 16 of the nozzle plate 3 engaged with the anti-rotation groove 13. The distal end side is pressed toward the distal end surface 10 of the valve body 5, and the spring action portion 16 of the nozzle plate 3 is caulked and fixed to the distal end surface 10 of the valve body 5 while being elastically deformed (bending deformation). At this time, as shown in FIG. 2 (d), a gap is formed between the spring action portion 16 that is caulked and fixed by the caulking projection 15 and the tip surface 10 of the valve body 5. The pressing force generated by the elastic deformation of the spring acting portion 16 of the nozzle plate 3 is not limited to the nozzle plate 3 and the valve body, even if the assembly accuracy of the nozzle plate 3 to the valve body 5 and the temperature change in the usage environment are taken into consideration. 5 (capability of preventing leakage of fuel from between the back surface 17 of the nozzle hole forming portion 18 and the front end surface 10 of the valve body 5) can be ensured.

  As shown in FIG. 4A, when the anti-rotation groove 13 is formed as a pair along the X-axis direction when a virtual plane orthogonal to the central axis 11 of the valve body 5 is an XY plane, A pair is formed along the direction, and the cantilever-like spring action portion 16 of the nozzle plate 3 is engaged. The pair of anti-rotation grooves 13 formed along the X-axis direction are formed so as to be symmetrical with respect to the central axis 11 of the valve body 5. Further, the pair of anti-rotation grooves 13 formed along the Y-axis direction are formed so as to be positioned symmetrically with respect to the central axis 11 of the valve body 5. Further, as shown in FIG. 3, the anti-rotation groove 13 prevents the nozzle plate 3 from moving around the central axis 11 of the valve body 5 when the spring action portion 16 of the nozzle plate 3 is engaged. (Stop rotation).

  As shown in FIGS. 2 to 5, the nozzle plate 3 is a plate-like body that is accommodated in a nozzle plate accommodating portion 8 formed on the distal end side of the valve body 5, and includes an arm portion 14 and a nozzle hole forming portion 18. The back surface 17 comes into contact with the front end surface 10 (nozzle plate support portion) of the valve body 5. The nozzle plate 3 includes a nozzle hole forming portion 18 in which a plurality of nozzle holes 7 are formed, cantilever-like spring action portions 16 formed at four locations around the nozzle hole forming portion 18 at equal intervals, And four arm portions 14 located between the adjacent spring action portions 16 and 16 and formed at equal intervals around the nozzle hole forming portion 18.

  As shown in FIG. 5, the nozzle hole forming portion 18 is positioned so as to face the fuel injection port 4 of the valve body 5 when the nozzle plate 3 is accommodated in the nozzle plate accommodating portion 8 of the valve body 5. It is formed, and a mortar-like (inverted truncated cone) recess 20 is formed at the center (see FIGS. 2 and 3). A plurality of nozzle holes 7 are formed in the bottom wall 21 of the recess 20 of the nozzle hole forming portion 18. A plurality of nozzle holes 7 are formed at equal intervals around the center 22 of the recess 20 (the center 22 of the nozzle plate 3), and atomize the fuel injected from the fuel injection port 4 of the valve body 5. ing. In the present embodiment, six nozzle holes 7 are formed at equal intervals in the nozzle hole forming portion 18. However, the present invention is not limited to this, and a required number of nozzle holes 7 are formed according to the use conditions. The nozzle holes 7 are not limited to a mode in which a plurality of nozzle holes 7 are formed at equal intervals in the nozzle hole forming section 18, and a plurality of nozzle holes 7 may be formed at unequal pitches in the nozzle hole forming section 18.

  As shown in FIG. 5, the spring action portion 16 is formed in a substantially rectangular shape in plan view, and is engaged with the detent groove 13 of the valve body 5. The spring acting portion 16 is entirely thinner than the nozzle hole forming portion 18 so that the back surface 23 side is positioned by retracting a predetermined dimension (step size) h from the nozzle hole forming portion 18 and the back surface 17 of the arm portion 14. Is formed. In addition, the spring action portion 16 has a groove 24 formed at the connection portion with the nozzle hole forming portion 18, and the connection portion with the nozzle hole formation portion 18 is thinner than the other portions. The groove 24 of the spring action portion 16 has a circular cross section perpendicular to the groove (cross section cut along line A4-A4 in FIG. 5A), and is formed over the entire width direction of the spring action portion 16. ing. Such a spring action part 16 can be easily bent and deformed by the thinned connection part (the part where the groove 24 is formed) with the nozzle hole forming part 18 and can be elastically deformed as a whole. In addition, the spring action part 16 does not project the radially outer end to the radially outer side of the valve body 5 when the nozzle plate 3 is housed in the nozzle plate housing part 8 of the valve body 5. .

  As shown in FIG. 5, the arm portion 14 has an arc shape in which the shape of the radially outer end 25 follows the radially inner surface 26 of the arc-shaped wall 12 of the valve body 5. The radius R1 of the end 25 is formed to be slightly smaller than the radius R2 of the radial inner surface 26 of the arcuate wall 12. Since such arm portions 14 are formed at four locations around the center 22 of the nozzle plate 3 at equal intervals, when the nozzle plate 3 is accommodated in the nozzle plate accommodating portion 8 of the valve body 5, the valve body 5 The arc-shaped wall 12 prevents the radial movement, and the center 22 of the nozzle plate 3 and the center axis 11 of the valve body 5 are aligned. In addition, the arm part 14 is separated from the side surface of the adjacent spring action part 16 by the notch groove 27 on both sides. Therefore, the spring action part 16 is flexibly deformed (elastically deformed) independently while being supported in a cantilever shape by the nozzle hole forming part 18.

  In the nozzle plate 3 formed as described above, the spring action portion 16 is engaged with the rotation preventing groove 13 and the arm portion 14 is engaged with the radial inner surface 12 side of the arcuate wall 12 of the valve body 5. Thus, the valve body 5 is accommodated in a state of being positioned in the nozzle plate accommodating portion 8 (a state in which the valve body 5 is prevented from rotating and the center 22 is aligned with the central axis 11 of the valve body 5). (See FIGS. 3 to 5). Next, the caulking projections 15 of the valve body 5 are bent (plastically deformed) toward the anti-rotation groove 13 by a caulking tool (not shown), so that the spring action portion 16 of the nozzle plate 3 is connected to the nozzle hole forming portion 18. The connecting portion is bent and deformed (elastically deformed) into a cantilever shape, and is fixed in a state where the distal end side of the spring action portion 16 is pushed toward the distal end surface 10 (nozzle plate support portion) of the valve body 5 (FIG. 2). At this time, the spring action part 16 is elastically deformed to be less than the step size h between the back face 17 of the arm part 14 and the nozzle hole forming part 18 and the back face 23 of the spring action part 16. It is fixed by caulking so that a gap is formed between the two. As a result, the arm portion 14 and the back surface 17 of the nozzle hole forming portion 18 are pressed against the distal end surface 10 of the valve body 5 by the elastic force of the spring action portion 16. In the present embodiment, the spring action portion 16 and the arm portion 14 are formed at four locations around the nozzle hole forming portion 18, but the present invention is not limited to this and is formed at two or more locations. In addition, among the plurality of spring acting portions 16, the width dimension of one spring acting portion 16 is different from the width dimension of the other spring acting portions 16 and is engaged with the one spring acting portion 16 with a slight gap. By forming the anti-rotation groove 13 in the valve body 5, it is possible to prevent an error in assembly in the rotational direction when the nozzle plate 3 and the valve body 5 are assembled. Moreover, although the attachment structure of the nozzle plate 3 which concerns on this embodiment illustrated the aspect which a clearance gap produces between the spring action part 16 fixed by the protrusion 15 for crimping, and the front end surface 10 of the valve body 5 (FIG. 2 ( d)), but not limited thereto, the assembly accuracy of the nozzle plate 3 and the valve body 5 and the influence of temperature change in the usage environment (the influence caused by the difference in thermal expansion between the nozzle plate 3 and the valve body 5), etc. 16 can be absorbed by the elastic deformation of the nozzle hole 18, and the back surface 17 of the nozzle hole forming portion 18 can be pressed against the front end surface 10 of the valve body 5 by the elastic force of the spring acting portion 16. As long as leakage from between the front end surfaces 10 of the valve body 5 can be prevented, the front end side of the spring acting portion 16 contacts the caulking projection 15 and the front end surface 10 of the valve body 5. It may be.

(Effect of 1st Embodiment)
According to the mounting structure of the nozzle plate 3 according to the present embodiment as described above, the nozzle plate 3 is fixed to the distal end side of the valve body 5 by plastically deforming the caulking protrusion 15 of the valve body 5. Therefore, the mounting structure of the nozzle plate 3 according to the present embodiment can reduce the number of manufacturing steps of the fuel injection device 1 compared with the conventional example in which the metal nozzle plate is welded and fixed to the tip of the metal valve body. The manufacturing cost of the injection device 1 can be reduced.

  Further, according to the mounting structure of the nozzle plate 3 according to the present embodiment, the nozzle plate 3 is caulked and fixed to the distal end side of the valve body 5 in a state where the spring acting portion 16 is elastically deformed. The back surface 17 of the nozzle hole forming portion 18 is always pressed against the tip surface 10 (nozzle plate support portion) of the valve body 5 by the elastic force of the spring action portion 16. Therefore, the mounting structure of the nozzle plate 3 according to the present embodiment can absorb the manufacturing error between the nozzle plate 3 and the valve body 5 by the elastic deformation of the spring action portion 16 and can compensate for the thermal expansion difference between the nozzle plate 3 and the valve body 5. It can be absorbed by the elastic deformation of the spring action part 16, and the nozzle plate 3 can be reliably fixed to the tip side of the valve body 5.

[Second Embodiment]
6 to 7 are views showing a mounting structure of the nozzle plate 3 according to the second embodiment of the present invention, and are views showing a modification of the first embodiment.

  The attachment structure of the nozzle plate 3 according to the present embodiment shown in FIGS. 6 to 7 is different from the shape of the spring action portion 16 according to the first embodiment in the shape of the spring action portion 16 of the nozzle plate 3. The configuration is the same as the mounting structure of the nozzle plate 3 according to the first embodiment.

  That is, in this embodiment, the spring action portion 16 of the nozzle plate 3 is formed with the inclined surface 30 for caulking so as to chamfer the upper portions of the side surfaces 28, 28, and is plastically deformed by a caulking tool (not shown). The caulking projection 15 presses the caulking inclined surface 30.

  According to the mounting structure of the nozzle plate 3 according to the present embodiment, the same effect as the effect of the mounting structure of the nozzle plate 3 according to the first embodiment can be obtained.

[Third Embodiment]
8 to 11 are views showing a mounting structure of the nozzle plate 3 according to the third embodiment of the present invention.

  As shown in FIGS. 8 to 10, in this embodiment, the valve body 5 has a ring-shaped protrusion 31 as the nozzle plate accommodating portion 8 formed in an annular shape along the radially outer edge of the tip surface 10. The caulking projections 32 (caulking portions) are integrally formed at three positions in the circumferential direction of the tip end surface 31 a of the ring-shaped projection 31. The caulking protrusions 32 are formed at three positions at equal intervals on the tip surface 31 a of the ring-shaped protrusion 31.

  As shown in FIGS. 8 to 11, the nozzle plate 3 has three spring action portions 16 formed at equal intervals on the outer peripheral side of the nozzle hole forming portion 18, and the spring action portions 16 are paired with the caulking projections 32. It is designed to be located correspondingly. The nozzle plate 3 has three arm portions 14 formed at equal intervals on the outer peripheral side of the nozzle hole forming portion 18, and is arranged so that the arm portion 14 is positioned between the adjacent spring action portions 16 and 16. ing. The arm portion 14 is formed in an arc shape in which the radially outer end edge 25 is fitted to the inner peripheral surface 33 of the ring-shaped protrusion 31 of the valve body 5 with a slight gap. The central axis 11 of the valve body 5 is aligned. The spring acting portion 16 is formed in an arc shape such that the shape of the radially outer end 16a (tip) follows the inner peripheral surface 33 of the ring-shaped protrusion 31, and the radially outer end 16a is a ring-shaped protrusion. A sufficient gap (a gap enough to absorb elastic deformation and thermal expansion of the spring acting portion 16) is formed between the inner peripheral surface 33 of 31. In addition, the spring action part 16 has a groove 24 formed in the connection part with the nozzle hole forming part 18 and the connection part with the nozzle hole formation part 18 is deformed, like the spring action part 16 of the first embodiment. Thinned to make it easier. Moreover, the spring action part 16 is separated from the adjacent arm parts 14 and 14 by the cut grooves 27 on both sides, and can be flexibly deformed (elastically deformed) independently.

  The nozzle plate 3 configured as described above is accommodated in the nozzle plate accommodating portion 8 on the distal end side of the valve body 5, and the position of the spring acting portion 16 is adjusted so as to correspond to the caulking protrusion 32 on a one-to-one basis. After that (see FIG. 9), when the caulking protrusion 32 of the valve body 5 is bent (plastically deformed) inward in the radial direction of the valve body 5 by a caulking tool (not shown), the spring action portion 16 is plastically deformed. The caulking projection 32 is bent and deformed (elastically deformed), and is fixed in a state in which the distal end side of the spring action portion 16 is pushed toward the distal end surface 10 (nozzle plate support portion) of the valve body 5 (FIG. 8). At this time, the spring acting portion 16 is elastically deformed to be smaller than the step size h between the back surface 23 and the back surface 17 of the nozzle hole forming portion 18 so that a gap is formed between the tip end surface 10 of the valve body 5. They are fixed (see FIG. 8C and FIG. 9B). The nozzle plate 3 is always pressed against the distal end surface 10 of the valve body 5 by the elastic force of the spring acting portion 16 and is securely fixed to the distal end side of the valve body 5.

  According to the mounting structure of the nozzle plate 3 according to the present embodiment as described above, the same effect as that of the mounting structure of the nozzle plate 3 according to the first embodiment can be obtained.

[Fourth Embodiment]
FIG. 12 is a view showing a mounting structure of the nozzle plate 3 according to the fourth embodiment of the present invention, and is a view showing a modification of the third embodiment.

  As shown in FIG. 12, the mounting structure of the nozzle plate 3 according to the present embodiment has a detent projection at the radially outer side end (tip) 25 of one arm portion 14 among the three arm portions 14. 34 is formed in a protruding manner, and a non-rotating groove 35 that engages with the anti-rotating projection 34 is formed in the ring-shaped projection 31. Other configurations are the same as the mounting structure of the nozzle plate 3 according to the third embodiment. It is the same.

  According to the mounting structure of the nozzle plate 3 according to the present embodiment having such a configuration, the nozzle plate 3 is caulked and fixed to the distal end side of the valve body 5 in a state where the nozzle plate 3 is accurately and simply positioned with respect to the valve body 5. Can do.

  Such an attachment structure of the nozzle plate 3 according to the present embodiment can obtain the same effect as the attachment structure of the nozzle plate 3 according to the first embodiment.

[Fifth Embodiment]
FIGS. 13 to 16 are views for explaining the mounting structure of the nozzle plate 3 according to the fifth embodiment of the present invention, and are diagrams showing modifications of the third embodiment.

  The attachment structure of the nozzle plate 3 according to the present embodiment shown in FIGS. 13 to 16 is different from the shape of the spring action portion 16 according to the third embodiment in the shape of the spring action portion 16 of the nozzle plate 3, and the valve body 5. The shape of the nozzle plate accommodating portion 8 is different from the shape of the nozzle plate accommodating portion 8 according to the third embodiment, but the other configuration is the same as the mounting structure of the nozzle plate 3 according to the third embodiment.

  That is, in the present embodiment, the spring action portion 16 of the nozzle plate 3 is formed with the inclined surface 36 for caulking so as to chamfer the upper portion of the radially outer end (tip) 16a. When the projection (caulking portion) 37 is plastically deformed by a caulking tool (not shown), the caulking inclined surface 36 is plastically deformed toward the tip surface 10 (nozzle plate support portion) of the valve body 5 by the caulking projection 37. The whole is bent and deformed (elastically deformed) so that a gap is formed between the front end surface 10 of the valve body 5 (see FIG. 13C).

  In the present embodiment, the valve body 5 has an arcuate wall 38 that engages the radial outer end 25 of the arm portion 14 of the nozzle plate 3 with a slight gap corresponding to the arm portion 14 of the nozzle plate 3. Three places are formed. The caulking protrusion 37 is formed between the adjacent arc-shaped walls 38 and 38 via the slit 40. The caulking projections 37 are formed at three equal intervals corresponding to the three spring operating portions 16 of the nozzle plate 3 and are separated from the arcuate wall 38, so that they are in the vicinity of the root (the tip of the valve body 5. It can be bent from the vicinity of the surface 10), and the caulking inclined surface 36 of the nozzle plate 3 can be reliably pressed.

  According to the mounting structure of the nozzle plate 3 according to the present embodiment, the same effect as the effect of the mounting structure of the nozzle plate 3 according to the third embodiment can be obtained.

  In addition, in the mounting structure of the nozzle plate 3 according to the present embodiment, like the mounting structure of the nozzle plate 3 according to the fourth embodiment, the nozzle plate 3 rotates around the radially outer end (tip) 25 of the arm portion 14 of the nozzle plate 3. A stop protrusion 34 may be formed, and a rotation stop groove 35 that engages with the rotation stop protrusion 34 may be formed in the arcuate wall 38 of the valve body 5 (see FIG. 12).

[Sixth Embodiment]
FIGS. 17 and 18 are views for explaining the mounting structure of the nozzle plate 3 according to the sixth embodiment of the present invention, and show a modification of the mounting structure of the nozzle plate 3 according to the third embodiment. is there. Note that in the description of the present embodiment, the description overlapping that of the third embodiment is omitted.

  As shown in FIG. 17, in a state before the nozzle plate 3 is caulked and fixed to the valve body 5, the protruding height of the ring-shaped protrusion 41 that is the nozzle plate housing portion 8 (the ring-shaped protrusion from the tip surface 10 of the valve body 5 41) is a dimension including the caulking allowance, and the protrusion height is sufficiently larger than the plate thickness dimension of the nozzle plate 3.

  Further, as shown in FIG. 17, the nozzle plate 3 is accommodated in the nozzle plate accommodating portion 8, and the entire circumference on the tip side of the ring-shaped protrusion 41 is caulked so as to fall down inward in the radial direction. The spring action portion 16 of the plate 3 is fixed to the valve body 5 in a state where the spring action portion 16 is bent and deformed (elastically deformed) less than the step size h between the tip surface 10 of the valve body 5 and the back surface 23 of the spring action portion 16 ( FIG. 17B and FIG. 18C). That is, in the present embodiment, the ring-shaped protrusion 41 uses a portion that is plastically deformed on the tip side as a caulking protrusion (caulking portion).

  Further, as shown in FIGS. 17 and 18, the nozzle plate 3 is formed with a caulking relief groove 42 on the radially outer side of the arm portion 14. Thereby, the nozzle plate 3 is caulked and fixed to the valve body 5 in a state where the spring acting portion 16 is elastically deformed mainly by the ring-shaped projection (caulking projection) 41. That is, in the present embodiment, the spring action portion 16 of the nozzle plate 3 is reliably fixed to the valve body 5 by the ring-shaped protrusion (caulking protrusion) 41.

  According to the mounting structure of the nozzle plate 3 according to the present embodiment as described above, the same effect as that obtained by the mounting structure of the nozzle plate 3 according to the third embodiment can be obtained.

[Seventh Embodiment]
FIG. 19 is a view for explaining the attachment structure of the nozzle plate 3 according to the seventh embodiment of the present invention, and is a view showing a modification of the sixth embodiment.

  As shown in FIG. 19, the nozzle plate 3 mounting structure according to the present embodiment has a detent 43 on the radially outer end (tip) 25 of one arm portion 14 among the three arm portions 14. The other structure is the same as the mounting structure of the nozzle plate 3 according to the sixth embodiment except that the ring-shaped protrusion 41 is formed with a rotation-preventing groove 44 that engages with the rotation-preventing protrusion 43. It is.

  According to the mounting structure of the nozzle plate 3 according to the present embodiment having such a configuration, the nozzle plate 3 is caulked and fixed to the distal end side of the valve body 5 in a state where the nozzle plate 3 is accurately and simply positioned with respect to the valve body 5. Can do.

  Such an attachment structure of the nozzle plate 3 according to the present embodiment can obtain the same effect as the attachment structure of the nozzle plate 3 according to the sixth embodiment.

[Eighth Embodiment]
20 and 21 are views for explaining the mounting structure of the nozzle plate 3 according to the eighth embodiment of the present invention, and are diagrams showing a modification of the sixth embodiment.

  As shown in FIGS. 20 and 21, in the nozzle plate 3 mounting structure according to the present embodiment, the shape of the nozzle plate 3 is different from the shape of the nozzle plate 3 according to the sixth embodiment. This is the same as the nozzle plate 3 mounting structure according to the sixth embodiment. That is, in this embodiment, the nozzle plate 3 has six spring action portions 16 formed at equal intervals around the nozzle hole forming portion 18 and no arm portion 14 (see FIGS. 17 and 18). ).

  According to the mounting structure of the nozzle plate 3 according to the present embodiment, when the ring-shaped projection (caulking projection) 41 is plastically deformed so as to be tilted radially inward by a caulking tool (not shown), six springs are provided. Since the action portion 16 is elastically deformed by the ring-shaped protrusion 41 and is fixed to the tip surface 10 of the valve body 5, the force with which the nozzle hole forming portion 18 of the nozzle plate 3 is pressed against the tip surface 10 of the valve body 5. Is larger than the mounting structure of the nozzle plate 3 according to the sixth embodiment.

  Such an attachment structure of the nozzle plate 3 according to the present embodiment can obtain the same effect as the attachment structure of the nozzle plate 3 according to the sixth embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Fuel injection device, 3 ... Nozzle plate (nozzle plate for fuel injection devices), 4 ... Fuel injection port, 5 ... Valve body, 7 ... Nozzle hole, 8 ... Nozzle plate accommodating part, 10 ... ... tip surface (nozzle plate support part), 11 ... central axis, 15, 32, 37 ... caulking projection (caulking part), 16 ... spring acting part, 18 ... nozzle hole forming part, 22 ... center , 41 ... Ring-shaped protrusion (caulking part)

Claims (6)

In the mounting structure of the nozzle plate for the fuel injection device in which the nozzle hole for atomizing the fuel flowing out from the fuel injection port of the fuel injection device is formed,
The metal valve body in which the fuel injection port is formed accommodates the fuel injection device nozzle plate formed of a synthetic resin material, and includes a center of the fuel injection device nozzle plate and a central axis of the valve body. A nozzle plate housing portion for centering the nozzle plate, a nozzle plate support portion against which the nozzle plate for the fuel injection device housed in the nozzle plate housing portion is abutted, and the fuel injection port for forming the nozzle plate for fuel injection. A caulking portion to be fixed to the distal end side,
The nozzle plate for the fuel injection device is fixed by caulking in a state in which the nozzle hole forming portion in which the nozzle hole is formed and the caulking portion are elastically deformed toward the distal end side of the valve body by plastic deformation. A spring acting part,
When the spring acting portion is elastically deformed and fixed to the distal end side of the valve body by the caulking portion, the nozzle hole forming portion is always pressed against the nozzle plate support portion of the valve body. Yes,
A fuel injection nozzle plate mounting structure. A plurality of the spring action portions are formed around the nozzle hole forming portion,
A plurality of the caulking portions are formed corresponding to the spring action portions,
The nozzle plate mounting structure for a fuel injection device according to claim 1. A plurality of the spring action portions are formed around the nozzle hole forming portion,
The nozzle plate housing portion is formed so as to surround the fuel injection device nozzle plate, and has the caulking portion at least in part.
The nozzle plate mounting structure for a fuel injection device according to claim 1. The nozzle plate for the fuel injection device is engaged with a rotation-preventing groove formed so that a part of the spring acting portion is partially cut away from the nozzle plate housing portion, and the nozzle plate for the fuel injection device is arranged around the central axis of the valve body. It is designed to be positioned and fixed in a locked state.
The nozzle injection plate mounting structure for a fuel injection device according to claim 1 or 2. The fuel injection device nozzle plate is formed with a non-rotating protrusion that is engaged with a non-rotating groove formed so as to partially cut out the nozzle plate housing portion, and the non-rotating protrusion is formed into the non-rotating groove. To be positioned and fixed in a state of being prevented from rotating around the central axis of the valve body,
The nozzle plate mounting structure for a fuel injection device according to any one of claims 1 to 3. The spring acting portion has an inclined surface pressed against the caulking portion plastically deformed, and is pressed against the nozzle plate support portion with an inclined component force acting on the inclined surface.
The nozzle plate mounting structure for a fuel injection device according to any one of claims 1 to 5.

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