JP2007032474A - Fuel injection valve-mounting structure and fuel supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure for inexpensively mounting a fuel injection valve in a fuel pipe to achieve high positioning accuracy. <P>SOLUTION: The mounting structure 10 is provided for mounting the fuel injection valve 6 in the fuel pipe which supplies fuel to the fuel injection valve 6. It comprises a cylindrical fuel supply port 14 branching from the pipe body of the fuel pipe for the fuel injection valve 6 to be inserted into the inner periphery side, and a rotation restricting part 40 for restricting the peripheral rotation of the fuel injection valve 6 with a protruded portion 30 of the fuel injection valve 6 fitted to a recessed portion 16 of the fuel supply port 14. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an attachment structure for attaching a fuel injection valve to a fuel pipe for supplying fuel to the fuel injection valve, and a fuel supply system.

  2. Description of the Related Art A technique for attaching a fuel injection valve to a fuel pipe in order to supply fuel through a fuel pipe to a fuel injection valve for injecting fuel into an engine intake passage or a combustion chamber is known. For example, in the technique disclosed in Patent Document 1, the fuel injection valve is fitted to the fuel pipe by fitting the fuel injection valve into a cylindrical fuel supply port branched from the pipe main body of the fuel pipe.

  In recent years, fuel injection valves having a plurality of injection holes with different injection directions have been widely used for the purpose of improving fuel consumption. When such a fuel injection valve is attached to the fuel pipe, it is necessary to position the fuel injection valve and regulate the rotation of the fuel injection valve in the circumferential direction. Therefore, in the technique disclosed in Patent Document 1, planar portions are formed at two locations facing each other on the inner peripheral surface of the fuel supply port, and the two planar portions of the fuel injection valve are sandwiched and fitted between these planar portions. The rotation of the fuel injection valve is restricted.

Japanese Utility Model Publication No. 60-173675

However, the technique disclosed in Patent Document 1 is difficult to process because a flat portion must be formed on the inner peripheral surface of the fuel supply port. Further, in the rotation restriction by the plane portion to the plane portion, the maximum rotation angle of the fuel injection valve that can be generated by the gap between the plane portions facing each other becomes large, and it is difficult to accurately perform the rotation restriction.
An object of the present invention is to provide a structure capable of obtaining a high positioning accuracy by attaching a fuel injection valve to a fuel pipe at a low cost, and a fuel supply system in which the fuel injection valve is attached to the fuel pipe by the structure. .

  The fuel injection valve mounting structure according to any one of claims 1 to 9 includes a fuel injection valve inserted into a fuel supply port, a protrusion provided on one of the fuel supply ports, a fuel injection valve, and a fuel supply. A rotation restricting portion that restricts rotation of the fuel injection valve in the circumferential direction by fitting with a recess or hole provided on the other side of the mouth is provided. In the configuration including such a rotation restricting portion, any one of the projecting portion, the recessed portion, and the hole portion can be formed in the fuel supply port by a simple and low-cost processing method such as press processing. Further, in order to achieve the rotation restriction of the fuel injection valve by fitting the protrusion and the recess or hole, the maximum rotation angle of the fuel injection valve that can be generated by the gap between the protrusion and the recess or hole is This is smaller than the conventional structure in which the flat portion of the fuel injection valve is sandwiched between the flat portions of the fuel supply port. As mentioned above, according to invention of Claims 1-9, a fuel injection valve can be attached to fuel piping at low cost, and a high positioning accuracy can be obtained.

According to the second aspect of the invention, in the axial direction of the fuel injection valve and the fuel supply port, the rotation restricting portion is located closer to the injection hole side of the fuel injection valve than the seal between the fuel injection valve and the fuel supply port. Therefore, it is possible to reliably prevent the fuel supplied from the fuel pipe to the fuel injection valve from leaking outside.
According to the invention described in claim 3, the rotation restricting portion in the axial direction of the fuel injection valve and the fuel supply port is located closer to the fuel inlet side of the fuel injection valve than the seal between the fuel injection valve and the fuel supply port. . For example, in this configuration, in the conventional fuel injection valve, by adding any one of a protrusion, a recess, and a hole to the fuel inlet side of the seal portion between the fuel supply port, the overall length is substantially the same as the conventional one. A fuel injection valve and a fuel supply port having an axial length can be realized.

  According to the fourth aspect of the present invention, for example, by pressing the inner peripheral surface of the material to be the fuel supply port, a recess opening in the inner peripheral surface of the fuel supply port can be easily and inexpensively formed. . Further, for example, when the positional relationship between the rotation restricting portion and the seal as in the invention described in claim 3 is adopted, the supply fuel from the fuel pipe to the fuel injection valve leaks out from the formation portion of the recess. It can be surely prevented.

  According to the fifth aspect of the present invention, for example, by pressing the material to be the fuel supply port, a hole that penetrates between the outer peripheral surfaces of the fuel supply port can be easily and inexpensively formed. Further, even if the through-hole portion is provided in the fuel supply port, the fuel supplied from the fuel pipe to the fuel injection valve can be supplied by adopting the positional relationship between the rotation restricting portion and the seal as in the second aspect of the invention. It is possible to reliably prevent leakage from the hole forming portion to the outside.

  According to the sixth aspect of the present invention, for example, by subjecting the material to be the fuel supply port to press working, it is possible to easily and inexpensively form the protruding portion that protrudes inward in the radial direction of the fuel supply port. Further, for example, even when the positional relationship between the rotation restricting portion and the seal as in the invention described in claim 2 is adopted, or when the positional relationship between the rotation restricting portion and the seal as in the invention according to claim 3 is adopted. The fuel supplied from the fuel pipe to the fuel injection valve can be reliably prevented from leaking outside.

According to the invention described in claim 7, since the rotation restricting portion is provided at one location between the fuel injection valve and the fuel supply port, a protrusion different from the normal one is fitted in the recess or the hole. It is possible to prevent a mounting error that greatly shifts the position of the fuel injection valve in the circumferential direction.
According to the eighth aspect of the present invention, since the rotation restricting portion is provided at a plurality of locations between the fuel injection valve and the fuel supply port, the contact area between the fuel injection valve and the fuel supply port is increased and the fuel injection is performed. The valve positioning accuracy is further increased.

  According to the ninth aspect of the invention, since the intervals between the plurality of rotation restricting portions arranged in the circumferential direction of the fuel injection valve and the fuel supply port are different, the fuel injection valve is different from the fuel supply port. When the circumferential position of is shifted, the fuel injection valve cannot be attached to the fuel supply port. Therefore, it is possible to prevent an attachment error such that a protrusion different from the normal one is fitted in the recess or the hole and the circumferential position of the fuel injection valve is shifted.

  According to the fuel supply system of the invention described in claim 10, since the plurality of fuel injection valves are respectively attached to the common fuel pipe by the mounting structure according to claim 8 or 9, the fuel injection valve is excellent in positioning accuracy. And an inexpensive system can be realized. Further, according to the invention described in claim 10, since the arrangement forms of the plurality of rotation restricting portions are different for each mounting structure, fuels different from normal ones are provided to the plurality of fuel supply ports branched from the common fuel pipe. It is possible to prevent a mounting error such that the injection valve is mounted.

According to the fuel supply system of the eleventh aspect of the invention, since a predetermined number of fuel injection valves are attached to the plurality of fuel pipes by the attachment structure according to the eighth or ninth aspect, the positioning accuracy of the fuel injection valves is determined. It is possible to realize an inexpensive system excellent in the above. Further, according to the invention described in claim 11, since the arrangement form of the plurality of rotation restricting portions in each mounting structure is different for each corresponding fuel pipe, another fuel is supplied to the fuel supply port branched from each fuel pipe. It is possible to prevent an attachment error such that a fuel injection valve corresponding to the fuel supply port branched from the pipe is attached.
In the case of manufacturing a plurality of fuel systems in which a plurality of fuel injection valves are attached to a predetermined fuel pipe by the attachment structure according to claim 8 or 9, the arrangement of a plurality of rotation restricting portions in each attachment structure is provided. The form may be different for each fuel system.

Hereinafter, a plurality of embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 2 shows a fuel supply system 2 according to the first embodiment of the present invention. In the fuel supply system 2, a plurality of fuel injection valves 6 are attached to a common fuel pipe 4 by a characteristic structure 10 and fuel is supplied to each fuel injection valve 6.

  The fuel pipe 4 forms a fuel conveyance path 12 in a pipe body 11 having a long circular tube shape. The pipe body 11 connected to the fuel pump via the fuel introduction pipe 13 conveys the fuel pressure-fed from the fuel pump through the fuel conveyance path 12, and stores it as necessary. A fuel supply port 14 for supplying the fuel in the fuel conveyance path 12 to each fuel injection valve 6 is branched from a plurality of locations in the tube axis direction of the tube body 11. Each fuel supply port 14 is formed in a cylindrical shape protruding from the pipe body 11 to the outer peripheral side, and communicates each inner hole with the fuel transport path 12.

  A plurality of fuel injection valves 6 are provided so as to be inserted into the inner peripheral side of the corresponding fuel supply port 14. As shown in FIG. 1, the fuel injection valve 6 has a fuel inlet 20 at one end in the axial direction into which fuel supplied from the fuel pipe 4 flows through the fuel supply port 14. The fuel injection valve 6 has a plurality of injection holes 21 at the other end in the axial direction for injecting fuel flowing into the fuel inlet 20 in accordance with the operation of the needle valve. In the fuel injection valve 6, a thick annular plate-like flange portion 22 is formed on the injection hole 21 side of the fuel inlet 20, and an outer peripheral surface 23 of the flange portion 22 is an inner peripheral surface 15 of the fuel supply port 14. Is fitted almost coaxially. In the fuel injection valve 6, a cylindrical seal receiving portion 24 is formed on the fuel inlet 20 side of the flange portion 22, and an O-ring as a seal is provided between the seal receiving portion 24 and the fuel supply port 14. 25 is interposed. Further, the nozzle portion 26 forming the injection hole 21 in the fuel injection valve 6 is attached to a corresponding intake pipe or cylinder of the internal combustion engine, whereby fuel is injected from each injection hole 21 into the intake pipe or cylinder. It has become so. Here, the fuel injection from each nozzle hole 21 is controlled by operating the needle valve in accordance with the drive power supplied to the terminal of the connector portion 27.

  As shown in FIGS. 1 and 3, a protrusion 30 is formed integrally with the flange portion 22 of the fuel injection valve 6. In the present embodiment, one protrusion 30 is provided for each fuel injection valve 6 so as to protrude radially outward from the outer peripheral surface 23 of the flange portion 22. In addition, a recess 16 into which the protrusion 30 is fitted is formed at one location corresponding to the protrusion 30 in the fuel supply port 14. As shown in FIGS. 1 and 4, the recess 16 is recessed radially outward from the inner peripheral surface 15 of the fuel supply port 14. Here, the recessed portion 16 is fitted to the flange portion 22 on the opening end surface 17 side of the fuel supply port 14 on the side opposite to the pipe main body 11 and the contact portion of the O-ring 25 on the inner peripheral surface 15. The fitting surface portion 18 is opened. Thus, when the fuel injection valve 6 is inserted into the fuel supply port 14 and attached, the protrusion 30 can be fitted into the recess 16 from the opening end face 17 side. As shown in FIG. 5, the recess 16 has substantially the same width as the protrusion 30 in the circumferential direction of the fuel supply port 14. Thus, the recess 16 holds the protrusion 30 from both sides in the circumferential direction of the fuel injection valve 6 and locks the protrusion 30 outside the outline of the inner peripheral surface 15 of the fuel supply port 14.

  As described above, in the first embodiment, the recess 16 of the fuel supply port 14 sandwiches and locks the protrusion 30 of the fuel injection valve 6 from both sides in the circumferential direction, so that the rotation of the fuel injection valve 6 in the circumferential direction is restricted. Thus, the fuel injection valve 6 can be positioned. That is, in the first embodiment, as shown in FIGS. 1 and 5, the rotation restricting portion 40 that restricts the rotation of the fuel injection valve 6 is constituted by the protrusion 30 of the fuel injection valve 6 and the recess 16 of the fuel supply port 14. Has been. Particularly in the first embodiment, the maximum rotation angle θ of the fuel injection valve 6 that can be generated by the gap 42 between the protrusion 30 and the recess 16 as shown in FIG. 6 is the fuel injection valve 44 in the conventional structure as shown in FIG. Is smaller than the maximum rotation angle Θ of the fuel injection valve 44 that can be generated by the gap 48 between the flat portion 45 of the fuel supply port 46 and the flat portion 47 of the fuel supply port 46. In short, in the first embodiment, the fuel injection valve 6 is difficult to rotate as compared with the conventional structure. The widths g and G of the gaps 42 and 48 shown in FIGS. 6 and 7 satisfy the relationship g = G, and the maximum diameters d and D of the fuel injection valves 6 and 44 shown in FIGS. 6 and 7 are d = D. Satisfy the relationship. Further, in FIGS. 6 and 7, the widths g and G of the gaps 42 and 48 are drawn larger than the actual width for easy understanding.

Further, the fuel supply port 14 having the concave portion 16 of the first embodiment can be easily and inexpensively formed by pressing the inner peripheral surface 151 of the cylindrical material 141, for example, as shown by the white arrow in FIG. Can be formed.
According to the above, it is possible to obtain high positioning accuracy by attaching the fuel injection valve 6 to the fuel pipe 4 at a low cost.

  Furthermore, in the first embodiment, only one protrusion 30 is provided on the fuel injection valve 6, and the recess 16 is provided at one location of the fuel supply port 14 corresponding to the protrusion 30. That is, since the rotation restricting portion 40 including the protrusion 30 and the recess 16 is provided at one location between the fuel injection valve 6 and the fuel supply port 14, the fuel injection valve 6 with respect to the fuel supply port 14. It is possible to prevent a mounting error that greatly shifts the circumferential position. The first embodiment that produces this effect is particularly effective when a predetermined injection direction is set in each of the plurality of injection holes 21 of the fuel injection valve 6.

  In addition, in the first embodiment, the recess 16 is provided on the opening end surface 17 side of the fuel supply port 14 with respect to the O-ring 25 and the seal receiving portion 24 that contacts the O-ring 25 in the fuel injection valve 6. Also, a protrusion 30 is provided on the nozzle hole 21 side. As a result, the rotation restricting portion 40 including the recess 16 and the protrusion 30 is positioned closer to the injection hole 21 than the O-ring 25 between the fuel injection valve 6 and the fuel supply port 14. It is possible to reliably prevent the fuel leakage from the location to the outside of the fuel supply port 14.

(Second embodiment)
As shown in FIG. 9, the second embodiment of the present invention is a modification of the first embodiment, and the description of the components that are substantially the same as those of the first embodiment will be omitted by attaching the same reference numerals. .
In the mounting structure 50 of the second embodiment, the protrusion 51 is provided so as to protrude radially outward from the outer peripheral surface 55 a of the backup ring 55 provided at the formation end 54 of the fuel inlet 20 of the fuel injection valve 52. Yes. Further, in the mounting structure 50, the concave portion 53 of the fuel supply port 56 is provided at a location away from the opening end surface 17 of the fuel supply port 56 toward the pipe body 11, and the inner periphery of the fuel supply port 56 does not open to the end surface 17. Opened only on the surface 15. Therefore, in order to insert and attach the fuel injection valve 52 to the fuel supply port 56, for example, the protrusion 51 provided so as to be relatively displaceable with respect to the fuel injection valve 52 is once displaced radially inward to change the fuel injection valve 52. After the tube body 11 is pushed into the fuel supply port 56, the projecting portion 51 is displaced radially outward by a spring force or the like and fitted into the recess 53. In the rotation restricting portion 58 composed of the fitted protrusion 51 and the recessed portion 53, the recess 53 holds the protrusion 51 not only from both sides in the circumferential direction of the fuel injection valve 52 but also from both sides in the axial direction of the fuel injection valve 52. Lock. In the mounting structure 50, the seal receiving portion 24 formed on the nozzle hole 21 side with respect to the backup ring 55 of the fuel injection valve 52 and the fitting formed on the opening end surface 17 side with respect to the concave portion 53 of the fuel supply port 56. An O-ring 25 is interposed between the surface portion 18.

In such a second embodiment, the fuel injection valve 52 can be attached to the fuel pipe 4 at low cost by the same principle as in the first embodiment, and high positioning accuracy can be obtained. It is possible to prevent a mounting error that shifts the circumferential position of the.
Furthermore, in the second embodiment, the rotation restricting portion 58 including the recess 53 and the protrusion 51 is positioned on the fuel inlet 20 side of the O-ring 25 between the fuel injection valve 52 and the fuel supply port 56, and the recess 53 opens only on the inner peripheral surface 15 of the fuel supply port 56. Therefore, it is possible to reliably prevent the fuel from leaking from the location where the recess 53 is formed to the outside of the fuel supply port 56.

  In addition, in the second embodiment, in the conventional fuel injection valve, the fuel injection valve 52 is formed by adding the protrusion 51 on the fuel inlet side of the O-ring between the fuel supply port and the fuel injection valve. The axial lengths of 52 and the fuel supply port 56 can be set to substantially the same length as the conventional fuel injection valve.

(Third embodiment)
As shown in FIGS. 10-12, 3rd embodiment of this invention is a modification of 1st embodiment, and demonstrates by attaching | subjecting the same code | symbol to the component substantially the same as 1st embodiment. Is omitted.
In the mounting structure 60 of the third embodiment, a hole 64 is formed in one place of the fuel supply port 62 corresponding to the protrusion 30 instead of the recess 16. The hole 64 penetrates between the outer peripheral surfaces 15 and 65 of the fuel supply port 62, and opens to the opening end surface 17 of the fuel supply port 62, the fitting surface portion 18 of the inner peripheral surface 15, and the outer peripheral surface 65. is doing. Thus, when the fuel injection valve 6 is inserted into the fuel supply port 62 and attached, the protrusion 30 can be fitted into the hole 64 from the opening end surface 17 side of the fuel supply port 62. Further, as shown in FIG. 11, the hole 64 has substantially the same width as the protrusion 30 in the circumferential direction of the fuel supply port 62. Thus, the hole 64 holds the protrusion 30 from both sides of the fuel injection valve 6 in the circumferential direction, and locks the protrusion 30 outside the outline of the inner peripheral surface 15 of the fuel supply port 62.

  As described above, in the third embodiment, the hole 64 of the fuel supply port 62 holds and locks the protrusion 30 of the fuel injection valve 6 from both sides in the circumferential direction, so that the rotation of the fuel injection valve 6 in the circumferential direction is prevented. The fuel injection valve 6 can be positioned by restriction. That is, in the third embodiment, as shown in FIGS. 10 to 12, the rotation restricting portion 66 that restricts the rotation of the fuel injection valve 6 is formed from the protrusion 30 of the fuel injection valve 6 and the hole 64 of the fuel supply port 62. It is configured. Further, in the third embodiment, as in the first embodiment, the maximum rotation angle of the fuel injection valve 6 that can be generated by the gap between the protrusion 30 and the hole 64 is set to the maximum rotation of the fuel injection valve 44 having the conventional structure. It can be made smaller than the angle Θ.

Further, the fuel supply port 62 having the hole portion 64 of the third embodiment can be easily and inexpensively formed by punching a cylindrical material by press working, for example.
According to the above, it is possible to obtain high positioning accuracy by attaching the fuel injection valve 6 to the fuel pipe 4 at a low cost.

  Furthermore, in the third embodiment, a hole 64 is provided at one location of the fuel supply port 62 corresponding to the only protrusion 30 provided in the fuel injection valve 6. That is, since the rotation restricting portion 66 including the protrusion 30 and the hole 64 is provided at one location between the fuel injection valve 6 and the fuel supply port 62, the circumferential position of the fuel injection valve 6 is large. It is possible to prevent mounting errors that may be shifted.

  In addition, in the third embodiment, the rotation restricting portion 66 including the hole portion 64 and the protrusion 30 is positioned on the injection hole 21 side with respect to the O-ring 25 between the fuel injection valve 6 and the fuel supply port 62. Therefore, it is possible to reliably prevent the fuel from leaking from the formation portion of the hole 64 to the outside of the fuel supply port 62.

(Fourth embodiment)
As shown in FIGS. 13 and 14, the fourth embodiment of the present invention is a modification of the third embodiment, and components that are substantially the same as those of the third embodiment are denoted by the same reference numerals. Is omitted.
In the mounting structure 70 of the fourth embodiment, the hole 73 of the fuel supply port 72 does not open to the opening end surface 17 of the fuel supply port 72 but opens only to the outer peripheral surfaces 15 and 65 of the fuel supply port 72. . Therefore, in order to insert the fuel injection valve 6 into the fuel supply port 72 and attach the fuel injection valve 6, for example, the protrusion 30 provided so as to be relatively displaceable with respect to the fuel injection valve 6 is once displaced inward in the radial direction. After the tube body 11 is pushed into the fuel supply port 72, the protrusion 30 is displaced radially outward by a spring force or the like and fitted into the hole 73. Alternatively, the protrusion 30 is fitted into the hole 73 by snap fitting while pushing the fuel injection valve 6 toward the pipe body 11 in the fuel supply port 72. In the rotation restricting portion 74 composed of the fitted protrusion 30 and the hole 73, the hole 73 holds the protrusion 30 not only from both sides in the circumferential direction of the fuel injection valve 6 but also from both sides in the axial direction of the fuel injection valve 6. And lock.

  In such a fourth embodiment, the fuel injection valve 6 can be attached to the fuel pipe 4 at a low cost by the same principle as in the third embodiment, and high positioning accuracy can be obtained. It is possible to prevent a mounting error that shifts the circumferential position of the. Furthermore, in the fourth embodiment, it is possible to reliably prevent the fuel from leaking from the location where the hole 73 is formed to the outside of the fuel supply port 72 by the same principle as in the third embodiment.

(Fifth embodiment)
As shown in FIG. 15, the fifth embodiment of the present invention is a modification of the first embodiment, and the description of the components that are substantially the same as those of the first embodiment will be omitted by attaching the same reference numerals. .
In the mounting structure 80 of the fifth embodiment, two protrusions 30 are integrally formed on the flange portion 22 of the fuel injection valve 82. Each protrusion 30 protrudes radially outward from the asymmetric position with respect to the central axis O of the flange portion 22, whereby the intervals W ₁ and W ₂ between the protrusions 30 arranged in the circumferential direction of the fuel injection valve 82 are set. For example, as shown in FIG. Further, the interval W ₁ (W ₂ ) between the protrusions 30 in the mounting structure 80 of the present embodiment is different for each mounting structure 80 as shown in comparison with, for example, FIGS. 15B and 16. Yes.

  In the mounting structure 80 of the fifth embodiment as described above, the recesses 16 are provided at two locations corresponding to the two protrusions 30 in the fuel supply port 84, and each recess 16 and each protrusion 30 are in a one-to-one relationship. By fitting, rotation of the fuel injection valve 82 in the circumferential direction is restricted. That is, in the fifth embodiment, the rotation restricting portion 40 composed of the recess 16 and the protrusion 30 is provided at two locations between the fuel injection valve 82 and the fuel supply port 84, and thereby the fuel injection The contact area between the valve 82 and the fuel supply port 84 is increased. Therefore, the fuel injection valve 82 can be attached to the fuel pipe 4 at low cost, and higher positioning accuracy can be obtained.

Further in the fifth embodiment, the interval W ₁ between projections 30 in the circumferential direction of the fuel injection valve 82, W _2, or spacing W ₁ between the rotation regulating portion 40 formed of projections 30 and recesses 16, W ₂ is a phase Different. Therefore, when the circumferential position of the fuel injection valve 82 is shifted from the fuel supply port 84, the fuel injection valve 82 cannot be attached to the fuel supply port 84. Therefore, it is possible to prevent a mounting error such that the protrusion 30 different from the normal one is locked in the recess 16 of the fuel supply port 84 and the circumferential position of the fuel injection valve 82 is shifted. In addition, in the fifth embodiment, the interval W ₁ (W ₂ ) between the protrusions 30 is different for each attachment structure 80, so that the arrangement form of the rotation restricting portion 40 including the protrusions 30 and the recesses 16 is the attachment structure 80. Each one has a different shape. Therefore, it is possible to prevent an installation error such that a different fuel injection valve 82 is attached to each of the plurality of fuel supply ports 84 branched from the common fuel pipe 4.

(Sixth embodiment)
As shown in FIGS. 17 and 18, the sixth embodiment of the present invention is a modification of the fifth embodiment, and components that are substantially the same as those of the fifth embodiment are denoted by the same reference numerals. Is omitted.
The fuel supply system 86 of the sixth embodiment includes a plurality of fuel pipes (two in the example of FIG. 17), and a predetermined number of fuel injection valves 82 are attached to the fuel pipes 87 and 88, respectively. . The mounting structure 89 of each fuel injection valve 82 is configured to set about interval W ₁ between projections 30 (W ₂₎ is equivalent to the mounting structure 80 of the fifth embodiment except for the different. Differences Here, the interval W ₁ between projections 30 at each mounting structure 89 (W ₂₎ is equal to each other in the corresponding fuel pipe is same mounting structure 89 together, and the corresponding fuel each pipe as shown in FIG. 18 is doing. 18A shows an example of the attachment structure 89 corresponding to the fuel pipe 87, and FIG. 18B shows an example of the attachment structure 89 corresponding to the fuel pipe 88.

According to such a sixth embodiment, the interval W ₁ (W ₂ ) between the protrusions 30 in each mounting structure 89 is different for each corresponding fuel pipe, so that the rotation restricting portion 40 in each mounting structure 89 is different. Are different for each corresponding fuel pipe. Therefore, it is possible to prevent an attachment error such that the attachment valve 82 to the fuel supply port 84 branched from another fuel pipe is attached to the fuel supply port 84 branched from each fuel pipe 87, 88. .

(Seventh embodiment)
As shown in FIGS. 19 and 20, the seventh embodiment of the present invention is a modification of the second embodiment, and the same reference numerals are given to substantially the same components as those in the second embodiment. Is omitted.
In the mounting structure 90 of the seventh embodiment, the backup ring 55 of the fuel injection valve 91 is formed with a recess 92 that is recessed radially inward from the outer peripheral surface 55a of the backup ring 55 instead of the protrusion 51. The recess 92 is open to the outer peripheral surface 55 a of the backup ring 55 and both end surfaces 55 b and 55 c in the axial direction of the backup ring 55.
Further, in the mounting structure 90, a protrusion 94 is formed in the fuel supply port 93 instead of the recess 53. The protrusion 94 protrudes radially inward from the pipe body 11 side of the inner peripheral surface 15 of the fuel supply port 93 with respect to the contact portion with the O-ring 25.

  As described above, since the recess 92 is open to the backup rings 55b and 55c, when the fuel injection valve 91 is inserted into the fuel supply port 93 and attached, the recess 92 is externally fitted from the opening end face 17 side to the protrusion 94. Is possible. Further, as shown in FIG. 20, the concave portion 92 has substantially the same width as the fitting portion of the protrusion 94 in the circumferential direction of the fuel injection valve 91. As a result, the projecting portion 94 locks the inner surface portion 95 in such a manner that it is sandwiched by the inner surface portion 95 of the recess 92 from both sides in the circumferential direction of the fuel injection valve 91 within the contour of the inner peripheral surface 15 of the fuel supply port 93. .

  Thus, in the seventh embodiment, the protrusion 94 of the fuel supply port 93 that is sandwiched from both circumferential sides of the fuel injection valve 91 by the inner surface 95 of the recess 92 of the fuel injection valve 91 locks the inner surface 95. The fuel injection valve 91 can be positioned by restricting the rotation of the fuel injection valve 91 in the circumferential direction. That is, in the seventh embodiment, as shown in FIGS. 19 and 20, the rotation restricting portion 96 that restricts the rotation of the fuel injection valve 91 is composed of a recess 92 of the fuel injection valve 91 and a protrusion 94 of the fuel supply port 93. Has been. Furthermore, in the seventh embodiment, similarly to the first embodiment, the maximum rotation angle of the fuel injection valve 91 that can be generated by the gap between the recess 92 and the projection 94 is set to the maximum rotation angle of the fuel injection valve 44 of the conventional structure. It can be made smaller than Θ.

In addition, the fuel supply port 93 having the protrusion 94 of the seventh embodiment can be easily and inexpensively formed by, for example, compressing and molding the inner peripheral surface side of a cylindrical material by pressing.
According to the above, it is possible to obtain high positioning accuracy by attaching the fuel injection valve 91 to the fuel pipe 4 at low cost.

  Furthermore, in the seventh embodiment, a protrusion 94 is provided at one location of the fuel supply port 93 corresponding to the only recess 92 provided in the fuel injection valve 91. That is, since the rotation restricting portion 96 including the concave portion 92 and the protrusion 94 is provided at one location between the fuel injection valve 91 and the fuel supply port 93, the circumferential position of the fuel injection valve 91 is greatly shifted. Such attachment mistakes can be prevented.

  In addition, in the seventh embodiment, the rotation restricting portion 96 composed of the recess 92 and the protrusion 94 is located on the fuel inlet 20 side with respect to the O-ring 25 between the fuel injection valve 91 and the fuel supply port 93. Therefore, it is possible to reliably prevent the fuel leakage from the fuel supply port 93 and to reduce the axial lengths of the fuel injection valve 91 and the fuel supply port 93 according to the same principle as in the second embodiment. The length can be set substantially the same as the injection valve.

Although a plurality of embodiments of the present invention have been described above, the present invention should not be construed as being limited to those embodiments.
For example, in the first to seventh embodiments, the axial lengths of the fuel injection valve and the fuel supply port may be set to lengths other than those shown in the drawings.

  Further, in the fifth and sixth embodiments, each protrusion 30 and each recess 16 may be provided at a location according to the second embodiment. Furthermore, in the fifth and sixth embodiments, each recess 16 may be replaced with a hole 64 according to the third or fourth embodiment. Furthermore, in the fifth and sixth embodiments, each protrusion 30 may be replaced with a recess 92 according to the seventh embodiment, and each recess 16 may be replaced with a protrusion 94 according to the seventh embodiment.

  Furthermore, in the fifth and sixth embodiments, three or more protrusions 30 and recesses 16 may be provided. In this case, it is desirable to make the intervals between the rotation restricting portions 40 different in the one fuel injection valve 82. Further, in this case, in the fifth embodiment, it is desirable that the arrangement form of the protrusions 30 is different for each mounting structure 80. In the sixth embodiment, the arrangement form of the protrusions 30 is different for each fuel supply system. It is desirable to make them different.

  In addition, in 5th embodiment, you may set the space | interval between each rotation control part 40 equally by some or all the attachment structures 80 of the fuel supply system 10. FIG. Here, when manufacturing a plurality of fuel supply systems 10 in which the intervals between the rotation restricting portions 40 are the same in all the mounting structures 80, the intervals between the rotation restricting portions 40 are changed for each fuel supply system 10. You may do it.

It is a fragmentary sectional side view which shows the attachment structure of the fuel injection valve by 1st embodiment. 1 is a perspective view showing a fuel supply system according to a first embodiment. It is a top view which shows the fuel injection valve by 1st embodiment. It is the longitudinal cross-sectional view (A) and bottom view (B) which show the fuel supply port by 1st embodiment. It is the VV sectional view taken on the line of FIG. It is a schematic diagram for demonstrating the effect | action of the attachment structure of the fuel injection valve by 1st embodiment. It is a schematic diagram for demonstrating the effect | action of a conventional structure. It is a mimetic diagram for illustrating the manufacturing method of the fuel supply port by a first embodiment. It is a fragmentary sectional side view which shows the attachment structure of the fuel injection valve by 2nd embodiment. It is a fragmentary sectional side view which shows the attachment structure of the fuel injection valve by 3rd embodiment. It is the XI-XI sectional view taken on the line of FIG. It is a XII arrow line view of FIG. It is a fragmentary sectional side view which shows the attachment structure of the fuel injection valve by 4th embodiment. It is a XIV arrow line view of FIG. It is the cross-sectional view (A) which shows the attachment structure of the fuel injection valve by 5th embodiment, and the schematic diagram for demonstrating the arrangement | positioning form of the rotation control part in the said attachment structure. It is a schematic diagram for demonstrating the arrangement | positioning form of the rotation control part in the attachment structure of the fuel injection valve by 5th embodiment. It is a perspective view which shows the some fuel supply system by 6th embodiment. It is a schematic diagram for demonstrating the arrangement | positioning form of the rotation control part in the attachment structure of the fuel injection valve by 6th embodiment. It is a fragmentary sectional side view which shows the attachment structure of the fuel injection valve by 7th embodiment. FIG. 20 is a sectional view taken along line XX in FIG. 19.

Explanation of symbols

2,86 Fuel supply system, 4,87,88 Fuel piping, 6,52,82,91 Fuel injection valve, 10, 50, 60, 70, 80, 89, 90 Mounting structure, 11 Pipe body, 14, 56, 62, 72, 84, 93 Fuel supply port, 15 Inner peripheral surface, 16, 53, 92 Recessed portion, 17 Open end surface, 18 Fitting surface portion, 20 Fuel inlet, 21 Injection hole, 22 Flange portion, 23 Outer peripheral surface, 24 Seal Receiving portion, 25 O-ring (seal), 30, 51, 94 protrusion, 40, 58, 66, 74, 96 rotation restricting portion, 42 clearance, 55 backup ring, 55a outer peripheral surface, 64 hole portion, 65 outer peripheral surface, 95 Inner surface, 141 Cylindrical material, 151 Inner circumferential surface, W ₁ , W ₂ spacing, θ Maximum rotation angle

Claims (11)

An attachment structure for attaching the fuel injection valve to a fuel pipe for supplying fuel to the fuel injection valve,
A fuel supply port branched from the pipe body of the fuel pipe, and the fuel injection valve is inserted on the inner peripheral side;
A circumferential direction of the fuel injection valve by fitting a protrusion provided on one of the fuel injection valve and the fuel supply port and a recess or a hole provided on the other of the fuel injection valve and the fuel supply port. A rotation restricting portion that restricts rotation to
A fuel injection valve mounting structure comprising: The fuel injection valve has an injection hole for injecting fuel supplied from the fuel pipe through the fuel supply port,
2. The rotation restricting portion in the axial direction of the fuel injection valve and the fuel supply port is located closer to the injection hole than a seal between the fuel injection valve and the fuel supply port. The fuel injection valve mounting structure described in 1. The fuel injection valve has a fuel inlet into which fuel supplied from the fuel pipe flows through the fuel supply port,
2. The rotation restricting portion in the axial direction of the fuel injection valve and the fuel supply port is located on the fuel inlet side with respect to a seal between the fuel injection valve and the fuel supply port. The fuel injection valve mounting structure described in 1.   The said rotation control part consists of the said protrusion which protrudes to the radial direction outer side of the said fuel injection valve, and the said recessed part opened to the internal peripheral surface of the said fuel supply port, Any one of Claims 1-3 characterized by the above-mentioned. The fuel injection valve mounting structure according to claim 1.   The rotation restricting portion includes the protrusion protruding outward in the radial direction of the fuel injection valve, and the hole penetrating between an inner peripheral surface and an outer peripheral surface of the fuel supply port. The fuel injection valve mounting structure according to any one of claims 1 to 3.   The said rotation control part consists of the said protrusion which protrudes to the radial inside of the said fuel supply port, and the said recessed part opened to the outer peripheral surface of the said fuel injection valve, The any one of Claims 1-3 characterized by the above-mentioned. The fuel injection valve mounting structure according to one item.   The fuel injection valve mounting structure according to any one of claims 1 to 6, wherein the rotation restricting portion is provided at one location between the fuel injection valve and the fuel supply port.   The fuel injection valve mounting structure according to claim 1, wherein the rotation restricting portion is provided at a plurality of locations between the fuel injection valve and the fuel supply port.   The plurality of rotation restricting portions are arranged in a form aligned in a circumferential direction of the fuel injection valve and the fuel supply port, and intervals between the rotation restricting portions are different from each other. Mounting structure of fuel injection valve. A fuel supply system for supplying fuel from a common fuel pipe to a plurality of fuel injection valves,
Each of the fuel injection valves is attached to the common fuel pipe by the attachment structure according to claim 8 or 9,
The fuel supply system, wherein the plurality of rotation restricting portions are arranged differently for each of the mounting structures. A fuel supply system for supplying fuel from a plurality of fuel pipes to a set number of fuel injection valves,
Each of the fuel injection valves is attached to the corresponding fuel pipe by the mounting structure according to claim 8 or 9,
The fuel supply system according to claim 1, wherein an arrangement form of the plurality of rotation restricting portions in each of the attachment structures is different for each corresponding fuel pipe.

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