JP2016065496A - Fuel delivery pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel delivery pipe capable of increasing a size accuracy at an injector fixing part while assuring a connecting strength between an injector fixing part and a main pipe.SOLUTION: A fuel delivery pipe 20 comprises a main pipe 30 having a main pipe hole 31 formed inside and an injector fixing part 40 arranged at an outer peripheral surface 32 of the main pipe 30. The injector fixing part 40 has a cylindrical part 41 with one end part 42 being released at its bottom part. The cylindrical part 41 has an injector that can be fixed at one end part 42 and at the same time it has a cylindrical part open hole 44 passing through its side wall 43 in inward or outward direction. The main pipe 30 has a main pipe side open hole 33 passing through its outer peripheral surface 32 in inward or outward direction so as to communicate with each of the main pipe hole 31 and the cylindrical part side open hole 44, an outer peripheral surface 34 in the main pipe 30 where the main pipe side open hole 33 is formed to be recessed inside the main pipe 30 in compliance with an outer peripheral surface 45A at a location where the cylindrical part open hole 44 in the cylindrical part 41 is formed.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a fuel delivery pipe.

  Conventionally, in an internal combustion engine or the like, a fuel delivery pipe (hereinafter referred to as “delivery pipe”) that distributes fuel supplied from a fuel supply pipe to injectors provided in each cylinder has been used (for example, patents). Reference 1). In the configuration disclosed in Patent Document 1, a branch hole is formed on the outer peripheral surface of the main pipe, and a bottom surface of a cylindrical tube portion (injector mounting portion) having a cylindrical shape is connected to the portion where the branch hole is formed. The branch hole is connected to the injector through the branching cylinder portion, so that the fuel is distributed from the delivery pipe to the injector.

JP 2002-195125 A

  By the way, such an internal combustion engine employs various engine layouts. Among them, the mounting position of the injector must be shifted to the outside in the radial direction with respect to the main pipe from the center position of the diameter in the main pipe, in other words, the offset position must be offset. There is a layout.

  As a delivery pipe corresponding to the offset type engine layout, a configuration in which the outer peripheral surface of the side wall of the injector mounting portion and the outer peripheral surface of the main pipe are joined instead of the bottom surface of the cylindrical injector mounting portion. In such a configuration, it is necessary to join the outer peripheral surface of the curved side wall and the outer peripheral surface of the main pipe. Compared with the case where the flat bottom surface and the outer peripheral surface of the main pipe are joined, the injector mounting portion There is a concern that the bonding strength between the injector mounting portion and the main pipe may be reduced due to the reduction of the bonding area between the main pipe and the main pipe.

  As a measure to ensure the bonding strength between the injector mounting portion and the main pipe, the applicant of the present application has recessed the outer peripheral surface of the side wall of the injector mounting portion inwardly in a shape that follows the shape of the outer peripheral surface of the main pipe. We have developed a joint that can join the main part and main pipe in surface contact.

  However, in the configuration in which the outer peripheral surface of the side wall of the injector mounting portion is recessed inward, the shape of the injector mounting portion becomes complicated, and there is room for improvement in terms of increasing the dimensional accuracy of the injector mounting portion. If the dimensional accuracy of the injector mounting portion is deteriorated, the sealing performance between the injector mounting portion and the injector may be deteriorated.

  The present invention has been completed based on the above situation, and provides a fuel delivery pipe capable of increasing the dimensional accuracy of the injector mounting portion while ensuring the bonding strength between the injector mounting portion and the main pipe. The purpose is to do.

  In order to solve the above-described problems, a fuel delivery pipe according to the present invention includes a main pipe in which a main pipe hole through which fuel passes is formed, and an injector mounting portion that is disposed on an outer peripheral surface of the main pipe and for mounting the injector. The injector mounting portion includes a cylindrical portion having a bottomed cylindrical shape with one end opened, and the cylindrical portion is configured such that the injector can be attached to the one end and a side wall thereof is provided. A main pipe having a cylindrical part side through-hole penetrating inward and outward directions, the main pipe communicating with the main pipe hole and the cylindrical part side through hole, respectively, and penetrating the outer peripheral surface in the inner and outer direction. The outer peripheral surface of the portion where the main pipe side through hole is formed in the main pipe follows the outer peripheral surface of the portion of the cylindrical portion where the cylindrical portion side through hole is formed. Recessed inward of main pipe Characterized in that it comprises.

  According to the present invention, the outer peripheral surface of the main pipe where the main pipe-side through hole is formed has a concave shape following the outer peripheral surface of the cylindrical portion where the cylindrical portion-side through hole is formed. Thus, the outer peripheral surface of the portion where the main pipe side through hole is formed and the outer peripheral surface of the portion where the cylindrical portion side through hole is formed can be joined in a surface contact state. And even if it is a case where the main pipe and the injector mounting portion are configured so as to be surface contactable, since the cylindrical portion has a bottomed cylindrical shape, compared to the injector mounting portion in which the outer peripheral surface of the side wall is recessed, The injector mounting portion can be a simple shape. As a result, it is possible to improve the dimensional accuracy of the injector mounting portion while securing the bonding strength between the injector mounting portion and the main pipe.

  In the above configuration, the fuel delivery pipe is attached to the cylinder head via a bolt, and at least a part of the fuel delivery pipe is connected to the main pipe and has a bolt hole through which the bolt is inserted. A bolt mounting portion that allows the main pipe to be mounted to the cylinder head by fastening the bolt to the cylinder head via the first mounting portion; and the injector mounting portion is connected to the one end of the cylindrical portion. The bolt mounting portion has a cylindrical portion insertion hole through which the cylindrical portion is inserted, and the cylindrical portion is inserted into the cylindrical portion insertion hole. The outer peripheral surface of the side wall and the inner peripheral surface of the insertion hole for the cylindrical portion may be joined, and the edge of the flange portion and the insertion hole for the cylindrical portion may be joined. .

  According to such a configuration, it is possible to sufficiently secure the bonding area between the bolt mounting portion and the injector mounting portion, and it is possible to ensure the bonding strength between the bolt mounting portion and the injector mounting portion.

  In the above configuration, the fuel delivery pipe is attached to the cylinder head via a bolt, and at least a part of the fuel delivery pipe is connected to the main pipe and has a bolt hole through which the bolt is inserted. A bolt mounting portion that allows the main pipe to be attached to the cylinder head by fastening the bolt to the cylinder head via the main head, and the main pipe side through-hole is formed on the outer peripheral surface of the main pipe. And the bolt mounting portion is joined to the surface located on the opposite side of the surface on which the main pipe side through hole is formed in the direction orthogonal to the axial direction of the main pipe. May be.

  When the main pipe and the injector mounting part are joined, deformation such as bending may occur in the main pipe. According to such a configuration, the main pipe and the injector mounting part are opposite to each other on the surface opposite to the joining surface of the main pipe and the injector mounting part. Since the bolt mounting portion is joined, such deformation can be offset between the opposite surfaces. For this reason, the main pipe can be hardly deformed in a direction orthogonal to the axial direction thereof.

  ADVANTAGE OF THE INVENTION According to this invention, the fuel delivery pipe which can improve the dimensional accuracy of an injector attachment part can be provided, ensuring the joint strength of an injector attachment part and a main pipe.

The perspective view which shows typically the structure of the fuel supply apparatus of Embodiment 1. FIG. The perspective view which shows the fuel delivery pipe with which the fuel supply apparatus of FIG. 1 is provided Fig. 2 is a side view of the fuel delivery pipe of Fig. 2. Cross-sectional view cut along line IV-IV in FIG. Longitudinal sectional view cut along line VV in FIG. Cross-sectional view showing a fuel delivery pipe provided in the fuel supply device of Embodiment 2 A longitudinal sectional view showing a fuel delivery pipe provided in the fuel supply device of Embodiment 3

<Embodiment 1>
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing a configuration of an automobile provided with a fuel supply device 10 of the present embodiment. The fuel supply device 10 is mounted on the vehicle body 15 of the automobile 14 and supplies fuel from the fuel tank 16 to the engine 17. The fuel supply device 10 includes a fuel supply pump 11, a filter 12, a pressure adjustment device 13, a fuel transfer pipe P1, a fuel supply pipe P2, a fuel return pipe P3, a fuel delivery pipe (hereinafter referred to as “delivery pipe”). 20).

  The fuel supply pump 11 pressurizes the fuel inside the fuel tank 16. The pressurized fuel is transferred from the fuel tank 16 to the engine 17 through the fuel transfer pipe P1. The transferred fuel is filtered by the filter 12 and sent to the fuel supply pipe P <b> 2 via the pressure adjusting device 13. The pressure of the fuel when supplied to the fuel supply pipe P <b> 2 is adjusted by the pressure adjusting device 13. A part of the fuel sent to the fuel supply pipe P2 is supplied to the engine 17 by the delivery pipe 20 connected to the fuel supply pipe P2, and the remaining fuel is returned to the fuel tank 16 through the fuel return pipe P3. It is.

  Here, the fuel broadly includes gasoline, high-concentration alcohol-containing fuel, or mixed fuel of gasoline and alcohol. As the alcohol, for example, methanol, ethanol, butanol and propanol can be used.

  As shown in FIGS. 2 and 4, the delivery pipe 20 is disposed in a main pipe 30 in which a main pipe hole 31 through which fuel passes is formed and an outer peripheral surface 32 of the main pipe 30, and an injector mounting portion 40 for mounting the injector. And. The delivery pipe 20 is configured by joining a main pipe 30 and a separate injector mounting portion 40. Here, “joining” means joining these members together by, for example, brazing or welding. In addition, the joining aspect of the main pipe 30 and the injector attachment part 40 is demonstrated later.

  As shown in FIG. 2, the delivery pipe 20 is configured such that the injector insertion portion 40 is connected to the elongated main pipe 30 so that the insertion direction of the injector (the axial direction of the injector attachment portion 40) is orthogonal to the delivery pipe 20. Yes. The delivery pipe 20 is configured such that a plurality of injector mounting portions 40 are arranged along the axial direction (longitudinal direction) of the main pipe 30. The delivery pipe 20 is configured such that each of the injector mounting portions 40 has a radius of the main pipe 30 on the outer side in the radial direction (side, lower side in FIG. 4) than the center position of the diameter in the main pipe 30 according to the layout of the engine 17. They are arranged at positions shifted by substantially the same distance (specifically, the distance obtained by subtracting the depth of the recess 34 from the radius of the main pipe 30). The delivery pipe 20 can be attached to the cylinder head 17A in such a posture that the lower side in FIG. 3 is located on the cylinder head 17A side. The lower side in FIG. Is described as a side.

  The injector mounting portion 40 is made of metal, and as shown in FIG. 5, a cylindrical portion 41 having a bottomed cylindrical shape with one end portion 42 (corresponding to one end portion described in the claims) opened, And a flange portion 46 extending outward from one end portion 42 of the cylindrical portion 41. The injector mounting portion 40 has a straight shape with no irregularities in the height direction of the cylindrical portion 41, and is formed by press molding.

  As shown in FIG. 5, the cylindrical portion 41 has a cylindrical portion-side through hole 44 that can be fitted with an injector (not shown) at one end portion 42 and that penetrates the side wall 43 inward and outward. Yes. A tapered surface 42A is formed on the one end portion 42 of the cylindrical portion 41 such that the inner diameter increases toward the end side (lower side in FIG. 5). In a state where the injector is attached to the injector attachment portion 40 (cylindrical portion 41), the space between the inner peripheral surface of the cylindrical portion 41 and the injector is sealed with a sealing member such as an O-ring. The fuel that has flowed into the cylindrical portion 41 is supplied to the injector of the engine 17.

  The main pipe 30 is made of a metal such as steel, stainless steel, aluminum, or copper, and is a tubular member whose axis extends linearly as shown in FIGS. 2 and 3. The main pipe 30 has a circular shape in a cross-sectional view in a portion other than a portion where a concave portion 34 and a bolt attachment portion joint portion 35 described later are formed. And as shown in FIG. 1, as for the main pipe 30, the one end part side is connected to the fuel supply pipe P2, and the other end part side is sealed. Further, a pressure sensor (not shown) is connected to the main pipe 30 and the pressure of the fuel supplied to the delivery pipe 20 is measured, and an engine 17 malfunction due to abnormal fuel pressure or pressure reduction occurs. Can be suppressed.

  As shown in FIG. 5, the main pipe 30 has a main pipe side through-hole 33 that penetrates the outer peripheral surface 32 in the inner and outer directions. The main pipe side through hole 33 is formed on the side of the main pipe 30 (the side having an angle of 90 ° with respect to the cylinder head 17A side) in a state where the main pipe 30 is attached to the cylinder head 17A. The main pipe side through hole 33 communicates with the main pipe hole 31 and the cylindrical part side through hole 44 in a state where the injector mounting portion 40 is attached to the main pipe 30. With such a configuration, the fuel that has flowed into the main pipe hole 31 from the fuel supply pipe P2 is distributed from each injector mounting part 40 to the injector via the main pipe side through hole 33 and the cylindrical part side through hole 44.

  As shown in FIGS. 4 and 5, the main pipe 30 has an outer peripheral surface 34 where the main pipe side through-hole 33 is formed recessed inwardly of the other outer peripheral surface 32. In other words, the outer peripheral surface 34 where the main pipe side through-hole 33 is formed is a concave portion that is partially recessed from the other outer peripheral surface 32 (hereinafter, the outer peripheral surface 34 is also referred to as the concave portion 34). . The concave portion 34 has a shape that follows the outer peripheral surface 45A of the cylindrical portion 41 where the cylindrical portion side through hole 44 is formed. Specifically, the recess 34 is formed in a curved surface that is curved in an arc shape along the axial direction of the main pipe 30 with the main pipe side through hole 33 as the center. The recess 34 is formed by pressing a part of the peripheral wall of the cylindrical main pipe 30.

  Further, as shown in FIG. 4, the outer peripheral surface 32 of the main pipe 30 has a bolt mounting portion, which will be described later, on a surface located on the opposite side to the surface where the main pipe side through hole 33 is formed in the direction orthogonal to the axial direction. A bolt mounting portion joint portion 35 to be joined to 50 is provided. The main pipe 30 has an outer peripheral surface that is recessed inward from the other outer peripheral surface in the joint 35 for the bolt attachment portion. The concave portion 34 and the bolt attachment portion joint portion 35 are provided on the outer peripheral surface 32 of the main pipe 30 at positions shifted from each other along the axial direction of the main pipe 30, and the concave portion and the main pipe side joint portion overlap each other. Compared to the provided configuration, the diameter of the main pipe hole 31 is partially prevented from becoming extremely narrow. As shown in FIG. 3, the bolt attachment portion joint portion 35 has a flat surface in which the bottom surface of the recess shape extends along the plate surface of the main pipe joint portion 54 of the bolt attachment portion 50. The bolt attachment portion joint portion 35 is formed by pressing a part of the peripheral wall of the main pipe 30 and is formed together with the recess portion 34 when the recess portion 34 is pressed.

  The delivery pipe 20 is configured to be attached to the cylinder head 17A via a bolt, has a bolt hole 51 through which the bolt is inserted, and fastens the bolt to the cylinder head 17A via the bolt hole 51. Thus, a bolt mounting portion 50 for mounting the main pipe 30 to the cylinder head 17A is provided.

  As shown in FIG. 2, the bolt mounting portion 50 is a metal plate-like member, and includes a bolt hole 51 and a cylindrical portion insertion hole 52 that passes through the cylindrical portion 41 so as to penetrate the plate surface. Is formed. The bolt hole 51 and the cylindrical portion insertion hole 52 are arranged side by side along the axial direction of the main pipe 30 on the side of the main pipe 30. Further, the bolt mounting portion 50 is disposed at a position corresponding to each of the injector mounting portions 40. The plurality of bolt mounting portions 50 are arranged in parallel so that the bolt holes 51 and the cylindrical portion insertion holes 52 are aligned on a straight line parallel to the axial direction of the main pipe 30.

  Further, the bolt mounting portion 50 rises from a flat plate-like fastening surface portion 53 in which the bolt hole 51 and the cylindrical portion insertion hole 52 are formed, and from one end portion of the fastening surface portion 53 to the bolt mounting portion joint portion 35 of the main pipe 30. A main pipe joint 54 that is extended and joined to the main pipe 30 and a reinforcing portion 55 that reinforces the fastening surface 53 by rising from the other end of the fastening surface 53 are provided. And the bolt attachment part 50 is made into the simple shape which the junction part 54 for main pipes, the fastening surface part 53, and the reinforcement part 55 continue in a U shape, and is formed by press-molding a board | plate material.

  The fastening surface portion 53 is fixed to the engine 17 by inserting a bolt into the bolt hole 51 from one plate surface (surface opposite to the cylinder head 17A) and fastening the bolt to the cylinder head 17A. Is done. On the other hand, as shown in FIG. 5, the cylindrical portion 41 of the injector mounting portion 40 is inserted into the fastening surface portion 53 from the other plate surface (the surface on the cylinder head 17A side) side through the cylindrical portion insertion hole 52. The flange portion 46 of the injector mounting portion 40 is locked to the plate surface. When a reaction force is received from the cylinder side during injector injection, a force acts on the fastening surface portion 53 toward the upper side in FIG. 5 (on the side opposite to the cylinder head 17A) via the injector mounting portion 40. 50 has a reinforcing portion 55 and is joined to the main pipe 30 and the injector mounting portion 40 so that deformation or the like hardly occurs.

  As shown in FIG. 3, the main pipe joint portion 54 has a flat plate shape, and one plate surface is joined to the bolt attachment portion joint portion 35 of the main pipe 30. According to such a configuration, regardless of the plate thickness of the bolt mounting portion 50, it is possible to secure a bonding area with the bolt mounting portion bonding portion 35 by setting the area of the plate surface to a desired size. it can.

Then, the joining aspect of the main pipe 30 and the injector attachment part 40, the injector attachment part 40 and the bolt attachment part 50, and the main pipe 30 and the bolt attachment part 50 is each demonstrated.
As shown in FIGS. 4 and 5, the main pipe 30 and the injector mounting portion 40 are joined in a state where the concave portion 34 and the outer peripheral surface 45 of the side wall 43 of the injector mounting portion 40 are in surface contact. Specifically, the location where the main tube side through hole 33 is formed in the main tube 30 and the location where the cylinder portion side through hole 44 is formed in the cylindrical portion 41 are the main tube side through hole 33 and the cylindrical portion side through hole. It joins in the area | region which surrounds the hole 44 over a perimeter. Note that the main pipe side through hole 33 and the cylindrical part side through hole 44 may be collectively formed after the main pipe 30 and the injector mounting part 40 are joined.

  As shown in FIG. 5, the injector mounting portion 40 and the bolt mounting portion 50 are configured such that the cylindrical portion 41 is inserted into the cylindrical portion insertion hole 52 and the outer peripheral surface 45 of the side wall 43 and the inner periphery of the cylindrical portion insertion hole 52. While the surface 52A is joined, the flange portion 46 and the hole edge portion 52B of the cylindrical portion insertion hole 52 are joined. In other words, the injector mounting portion 40 and the bolt mounting portion 50 are assembled in such a manner that the fastening surface portion 53 of the bolt mounting portion 50 presses the flange portion 46 of the injector mounting portion 40 from above. When a reaction force is received from the cylinder side during the injector injection, a force acts on the injector mounting portion 40 upward in FIG. 5 (on the side opposite to the cylinder head 17A). Thus, the floating of the injector mounting portion 40 can be suitably suppressed.

  As shown in FIGS. 3 and 4, the main pipe 30 and the bolt attachment portion 50 are joined in a state where the bolt attachment portion joint portion 35 and the main pipe joint portion 54 are in surface contact. The main pipe 30 and the bolt mounting portion 50 are joined at a location located on the opposite side of the joint location between the main pipe 30 and the injector mounting portion 40 (cylindrical portion 41) in the direction orthogonal to the axial direction of the main pipe 30. ing. Here, since the main pipe 30 is also joined to the injector mounting portion 40, the main pipe 30 has one surface that is joined by joining the injector mounting portion 40 and the bolt mounting portion 50 as described above. While being indirectly bonded to the bolt mounting portion 50 via the injector mounting portion 40, the other surface (the surface on which the bolt mounting portion bonding portion 35 is provided) is directly bonded to the bolt mounting portion 50. It can be said that.

Then, the effect | action and effect of this embodiment are demonstrated.
According to the present embodiment, the outer peripheral surface 34 of the main pipe 30 where the main pipe side through hole 33 is formed follows the outer peripheral surface 45A of the cylindrical portion 41 where the cylindrical portion side through hole 44 is formed. Since it is the recessed part 34, it joins in the state which made the surface contact of the outer peripheral surface 34 of the location in which the main pipe side through-hole 33 was formed, and the outer peripheral surface 45A of the location in which the cylindrical part side through-hole 44 was formed. be able to. And even if it is a case where the main pipe 30 and the injector attachment part 40 are comprised so that surface contact is possible, since the cylindrical part 41 makes bottomed cylindrical shape, it is in the injector attachment part made into the shape where the outer peripheral surface of the side wall was dented. In comparison, the injector mounting portion 40 can be formed into a simple shape. As a result, it is possible to increase the dimensional accuracy of the injector mounting portion 40 while ensuring the bonding strength between the injector mounting portion 40 and the main pipe 30.

  Temporarily, when forming the injector attachment part in which the outer peripheral surface of a side wall is dented, it is possible to form it by, for example, performing the process which dents a side wall with respect to the press-molded cylindrical member. . However, when such processing is performed, the dimensional accuracy is likely to be reduced as compared with the case of forming only by press molding. In particular, in order to ensure the sealing performance with the injector, the dimensional accuracy of the inner diameter of the injector mounting portion becomes a problem. However, in the process of recessing the side wall, the side wall is deformed along the radial direction of the injector mounting portion. Thus, it becomes difficult to obtain the dimensional accuracy of the inner diameter. Further, in the injector mounting portion in which the outer peripheral surface of the side wall is recessed, it is necessary to secure a portion for mounting the injector on the opening end side from the portion forming the recessed shape, and the side wall is formed in a straight shape. There is a concern that the height dimension of the injector mounting portion will be larger than in the case of the above. In this case, the shape becomes more difficult to press-mold. On the other hand, in the present embodiment, the cylindrical portion 41 having a bottomed cylindrical shape can be formed by press molding, and it is not necessary to perform another processing or increase the height dimension as described above. . For this reason, the dimensional accuracy of the injector mounting portion 40, particularly the dimensional accuracy of the inner diameter, can be increased as compared with the injector mounting portion in which the outer peripheral surface of the side wall is recessed.

  In the present embodiment, the bolt mounting portion 50 and the injector mounting portion 40 are configured such that the cylindrical portion 41 is inserted into the cylindrical portion insertion hole 52 and the outer peripheral surface 45 of the side wall 43 and the inner periphery of the cylindrical portion insertion hole 52. While the surface 52A is joined, the flange portion 46 and the hole edge portion 52B of the cylindrical portion insertion hole 52 are joined. For this reason, the joining area between the bolt mounting part 50 and the injector mounting part 40 can be sufficiently secured, and the joining strength between the bolt mounting part 50 and the injector mounting part 40 can be secured.

  Further, in the present embodiment, on the outer peripheral surface 32 of the main pipe 30, the portion where the main pipe side through-hole 33 is formed and the cylindrical portion 41 are joined, and the main pipe side penetration is performed in a direction orthogonal to the axial direction of the main pipe 30. The bolt attachment portion joint 35 and the bolt attachment portion 50 located on the opposite side of the surface on which the hole 33 is formed are joined. When the main pipe 30 and the injector mounting portion 40 are joined, deformation such as bending may occur in the main pipe 30, but according to such a configuration, the side opposite to the joint surface between the main pipe 30 and the injector mounting portion 40 is produced. Since the main pipe 30 and the bolt mounting portion 50 are joined at the surface, such deformation can be offset between the opposite surfaces. For this reason, the main pipe 30 can be made difficult to be deformed in a direction orthogonal to the axial direction thereof.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. The fuel delivery pipe 120 of the present embodiment is different from the fuel delivery pipe 20 of the above embodiment in the manner of joining the main pipe 130 and the bolt mounting portion 150. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned embodiment is abbreviate | omitted.

  In the main pipe 130, a surface facing the fastening surface portion 53 (a surface located on the cylinder head 17 </ b> A side) is a bolt attachment portion joint portion 135 that is joined to the bolt attachment portion 150 in the outer peripheral surface 32. The joint portion 135 for the bolt attachment portion is not recessed as in the above-described embodiment, and has a curved surface like the other portions of the outer peripheral surface 32.

  The main pipe joint portion 154 extends from the fastening surface portion 53 to the bolt attachment portion joint portion 135, and an extended end surface 154A located on the opposite side of the fastening surface portion 53 is a curved surface that follows the shape of the outer peripheral surface 32 of the main pipe 130. It has a shape. In other words, the bolt mounting portion 150 has a plate shape, the bolt hole 51 is formed on the plate surface, and the side surface 154 </ b> A has a curved surface shape following the shape of the outer peripheral surface 32 of the main pipe 130.

  According to such a configuration, the bolt mounting portion 150 can be reduced in size as compared with the case where the main pipe joint is extended to the side of the main pipe. Further, when the main pipe joint is extended to the lower surface of the main pipe, the extension end face 154A and the outer peripheral surface 32 of the main pipe 130 are joined as compared with the configuration in which the extension end face is flat. The area can be increased, and the bonding strength between the bolt mounting portion 154 and the main pipe 130 can be increased.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. The fuel delivery pipe 220 of this embodiment differs from the fuel delivery pipes 20 and 120 of the above embodiment in the arrangement configuration of the plurality of injector mounting portions 240. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned embodiment is abbreviate | omitted.

  In the delivery pipe 220, each of the injector mounting portions 240 has a radius of the main pipe 230 on both sides (lower side and upper side in FIG. 7) on the radially outer side than the center position of the diameter in the main pipe 230 according to the layout of the engine 17. Are shifted by a distance approximately equal to the distance (specifically, a distance obtained by subtracting the depth of the recess 34 from the radius of the main pipe 230). In other words, in the above-described embodiment, the configuration in which each of the injector mounting portions 40 is joined to the same side of the main pipe 30 is illustrated. However, in this embodiment, each of the injector mounting portions 240 is connected to the main pipe 230. It is set as the structure joined to the both sides, respectively.

  When the main pipe 230 and the injector mounting portion 240 are joined, deformation such as bending may occur in the main pipe 230. According to the configuration of the present embodiment, the joint surface between the main pipe 230 and the injector mounting portion 240 is the main pipe 230. Therefore, it is possible to cancel such deformation between the opposite surfaces. For this reason, the main pipe 230 can be made difficult to be deformed in a direction perpendicular to the axial direction thereof.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention, and further, within the scope not departing from the gist of the invention other than the following. Various modifications can be made.
(1) In the above-described embodiment, the description has been given using the delivery pipe whose main pipe has a circular cross-sectional shape, but is not limited thereto. For example, the cross-sectional shape of the main pipe of the delivery pipe may be a polygon.

(2) In the above embodiment, the injector mounting portion and the bolt mounting portion are formed by press molding. However, the method of forming the injector mounting portion and the bolt mounting portion is not limited to this. For example, the injector mounting portion and / or the bolt mounting portion may be formed by bending a plate material.

(3) In the above embodiment, the concave portion and the bolt mounting portion are exemplified by press working, but the method of forming the concave portion is not limited to this. For example, you may shape | mold the recessed shape which concerns on a recessed part and a bolt attachment part simultaneously with the shaping | molding of a main pipe.

17A ... cylinder head, 20, 120, 220 ... fuel delivery pipe, 30, 130, 230 ... main pipe, 31 ... main pipe hole, 32 ... outer peripheral surface, 33 ... main pipe side through hole, 34 ... main pipe side through hole are formed The outer peripheral surface of the part, the concave portion, 35 ... the joint portion for the bolt attachment portion (the surface located on the side opposite to the surface where the main pipe side through hole is formed), 40, 240 ... the injector attachment portion, 41 ... the cylindrical portion, 42 ... One end part (one end part), 43 ... side wall, 44 ... outer peripheral surface, 44A ... outer peripheral surface where the cylindrical part side through-hole is formed, 46 ... flange part, 50 ... bolt mounting part, 51 ... bolt hole, 52 ... Cylinder part insertion hole

Claims (3)

A main pipe formed inside with a main pipe hole for passing fuel;
An injector mounting portion that is disposed on the outer peripheral surface of the main pipe and for mounting the injector;
The injector mounting portion includes a cylindrical portion having a bottomed cylindrical shape with one end opened,
The cylindrical portion has a cylindrical portion side through-hole formed by penetrating the side wall in the inner and outer directions, while allowing the injector to be attached to the one end portion.
The main pipe has a main pipe side through-hole formed in such a manner as to communicate with the main pipe hole and the cylindrical portion side through-hole, and through the outer peripheral surface in the inner and outer directions,
An outer peripheral surface of the main pipe where the main pipe side through-hole is formed is recessed inward of the main pipe in a shape that follows an outer peripheral surface of the cylindrical portion where the cylindrical part-side through hole is formed. A fuel delivery pipe characterized by A fuel delivery pipe attached to the cylinder head via a bolt,
At least a portion is connected to the main pipe, and has a bolt hole for inserting the bolt, and by fastening the bolt to the cylinder head through the bolt hole, the main pipe is connected to the cylinder head. A bolt mounting portion that can be mounted on
The injector mounting portion has a flange portion extending outward from the one end portion of the cylindrical portion,
The bolt mounting portion has a cylindrical portion insertion hole for inserting the cylindrical portion,
The cylindrical portion is inserted into the cylindrical portion insertion hole, the outer peripheral surface of the side wall and the inner peripheral surface of the cylindrical portion insertion hole are joined, and the flange edge of the cylindrical portion insertion hole The fuel delivery pipe according to claim 1, wherein the portions are joined. A fuel delivery pipe attached to the cylinder head via a bolt,
At least a portion is connected to the main pipe, and has a bolt hole for inserting the bolt, and by fastening the bolt to the cylinder head through the bolt hole, the main pipe is connected to the cylinder head. A bolt mounting portion that can be mounted on
In the outer peripheral surface of the main pipe, the portion where the main pipe side through hole is formed and the cylindrical portion are joined, and the surface where the main pipe side through hole is formed in a direction orthogonal to the axial direction of the main pipe The fuel delivery pipe according to claim 1 or 2, wherein a surface located on the opposite side and the bolt mounting portion are joined.

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