JP2016075244A - Process of manufacture of fuel delivery pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process of manufacture of fuel delivery pipe capable of restricting a state in which either a plug or a pipe main body is damaged and enabling the plug to be engaged with the pipe main body.SOLUTION: This invention relates to a process of manufacture of a delivery pipe 20 comprising a pipe main body 30 having a fuel flow passage 31 in it and a plug 40 inserted into one end of the pipe main body 30 so as to close the end part of the fuel flow passage 31. The process includes a step for making the pipe main body 30 for forming a plug insertion part 32 having a tapered surface 32A having a larger inner diameter than a diameter D1 of the fuel flow passage 31 and having a larger diameter toward the end side of a pipe-like member 35 at one end part 30A of the pipe-like member 35 to make the pipe main body 30; a plug insertion step for inserting the plug 40 having an outer diameter D3 larger than the diameter D1 into the plug insertion part 32 along the tapered surface 32A; and a sealing step for sealing between an outer peripheral surface 43A of the plug 40 inserted into the plug insertion part 32 and the tapered surface 32A.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a method for manufacturing a fuel delivery pipe.

  2. Description of the Related Art 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 is used (for example, Patent Documents). 1). Patent Document 1 describes a method for manufacturing a delivery pipe in which a plug is press-fitted into one end of a pipe body.

Akira 61-138865

  However, in the method described in Patent Document 1, in order to improve the sealing performance between the plug and the pipe body, it is necessary to increase the press-fitting allowance between the plug and the pipe body. On the other hand, when the press-fitting allowance is increased, the force applied to the plug and the pipe body when the plug is inserted into the pipe body increases, and the plug and the pipe body may be damaged.

  As a method of manufacturing a delivery pipe that can secure a seal between the plug and the pipe body and suppress damage to the plug and the pipe body, the press-fitting allowance is sufficiently reduced with respect to the inner diameter of the pipe-shaped member. A method is conceivable in which a plug having an outer diameter is inserted into the pipe-shaped member and then sealed between the two parts by a sealing means such as brazing. However, in such a method, the plug cannot be positioned in the insertion direction with respect to the pipe-shaped member, and the plug is placed at a predetermined position in the pipe-shaped member in a state before sealing between the two. It is difficult to lock.

  The present invention has been completed based on the above circumstances, and manufacture of a fuel delivery pipe capable of preventing the plug and the pipe main body from being damaged and capable of locking the plug to the pipe main body. It aims to provide a method.

  In order to solve the above problems, a method of manufacturing a fuel delivery pipe comprising: a pipe body having a fuel flow passage therein; and a plug inserted into one end portion of the pipe body and closing the end portion of the fuel flow passage. And at one end of the pipe-shaped member having the same inner diameter as the diameter of the fuel flow passage, the inner diameter is larger than the diameter of the fuel flow passage, and the diameter is increased toward the end side of the pipe-shaped member. Forming a pipe body by forming a plug insertion portion having a tapered surface, and inserting a plug having an outer diameter larger than the diameter of the fuel flow passage into the plug insertion portion along the tapered surface A plug insertion step, and a sealing step of sealing between the outer peripheral surface of the plug inserted into the plug insertion portion and the tapered surface.

  According to the present invention, before the plug is inserted into the pipe body, the plug insertion portion having a tapered surface having a diameter increasing toward the one end portion side is formed. Compared with a method in which a plug is press-fitted into a pipe-shaped member having an inner diameter, a force applied to the plug and the pipe body in the plug insertion process can be reduced, and a situation where the plug and the pipe body are damaged can be suppressed. Further, since the plug insertion portion has a tapered surface, it is easy to insert the plug to a predetermined position along the tapered surface in the plug insertion process, and the tapered surface is used before and during the sealing process. Thus, the plug can be locked to the pipe body.

  The said structure WHEREIN: In the said pipe main body creation process, you may form in the shape which follows the outer peripheral surface of the said plug insertion part.

  According to such a configuration, the plug can be inserted into the plug insertion portion without plastically deforming the plug or / and the pipe body in the plug insertion process, and the force applied to the plug and the pipe body can be further reduced. be able to.

  The said structure WHEREIN: In the said pipe main body preparation process, the said plug insertion part may be formed by carrying out the plastic deformation of the one end part of the said pipe-shaped member toward a radial direction outer side.

  According to such a structure, while using an existing pipe-shaped member, a plug insertion part can be formed suitably with a simple process.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to protect a plug and a pipe main body, in the state before sealing between a plug and a pipe main body, the fuel delivery pipe of which a plug can be latched in the inside of a pipe main body. A manufacturing method can be provided.

The perspective view which shows typically the structure of a motor vehicle provided with the fuel supply apparatus of Embodiment 1. FIG. The fragmentary sectional view which shows the structure of the fuel delivery pipe with which the fuel supply apparatus of FIG. Sectional drawing which shows the tool for forming a plug insertion part, and a pipe-shaped member in a pipe main body preparation process Sectional drawing which shows the aspect which forms a plug insertion part using the tool of FIG. 3 in a pipe main body preparation process. Sectional drawing which shows the plug and pipe main body before being inserted in a plug insertion part in a plug insertion process The perspective view which shows the state by which the plug was latched by the plug insertion part in the plug insertion process. Sectional drawing which shows the plug and pipe main body before being inserted in a plug insertion part in the plug insertion process of Embodiment 2. Sectional drawing which shows the plug and pipe main body before being inserted in a plug insertion part in the plug insertion process 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 FIG. 2, the delivery pipe 20 includes a pipe body 30 having a fuel flow passage 31 therein, a plug 40 inserted into one end portion 30 </ b> A of the pipe body 30 and closing the end portion of the fuel flow passage 31, It has. In FIG. 2, only the pipe body 30 and the plug 40 are shown in cross section.

  The delivery pipe 20 is provided with a plurality (four in this embodiment) of injector mounting portions 21 arranged on the outer peripheral surface of the pipe body 30 at predetermined intervals along the axial direction (longitudinal direction) of the pipe body 30. ing. Each injector mounting portion 21 has a cylindrical shape, and the inside thereof is connected to the pipe body 30 so as to communicate with the fuel flow passage 31. An injector 22 provided in the engine is attached to the open end of the injector attachment portion 21.

  The pipe body 30 is made of metal such as steel, stainless steel, aluminum, or copper, and is a tubular member whose axis L1 extends linearly as shown in FIG. The pipe body 30 has a circular shape in cross section, a fuel flow passage 31 having a diameter D1 is formed therein, and an end face 33 (hereinafter referred to as a pipe body side end face 33) located on the one end 30A side is a fuel flow. An annular shape having an inner diameter D2 larger than the diameter D1 of the passage 31 is formed (see FIG. 6). The pipe body 30 has a plug insertion portion 32 (described later) formed at one end portion 30 </ b> A, and the end portion 30 </ b> A side is sealed by assembling the plug 40 to the plug insertion portion 32. In addition, the pipe body 30 is formed with an inlet 23 connected to the fuel supply pipe P <b> 2 at the other end, and fuel is introduced from the other end through the inlet 23. Further, a pressure sensor (not shown) is connected to the pipe body 30, and the pressure of the fuel supplied to the delivery pipe 20 is measured, and the malfunction of the engine 17 due to abnormal pressurization or abnormal decompression of the fuel is detected. It is possible to suppress the occurrence.

  The plug 40 is made of metal and has a bowl shape (bottom cylindrical shape) having an outer diameter D3 larger than the diameter D1 of the fuel flow passage 31 as shown in FIG. 5 (D3> D1). In the present embodiment, the outer diameter D3 of the plug 40 is the outer diameter of an end surface 41 (hereinafter referred to as the plug-side end surface 41) located on the side opposite to the bottom surface portion 42 described later. The plug 40 may be a so-called bowl-shaped plug, or may be formed by press-molding a disk-shaped member. The plug 40 may be made of a material that is more easily plastically deformed than the pipe body 30. According to the manufacturing method of the present embodiment, the plug 40 is particularly preferably damaged in such a case. The situation can be suppressed.

  As shown in FIG. 5, the plug 40 includes a bottom surface portion 42, a side surface portion 43 rising from the outer periphery of the bottom surface portion 42, and a recess 44 formed by the bottom surface portion 42 and the side surface portion 43. The side surface portion 43 is formed as a tapered surface having an outer peripheral surface 43A that expands radially outward as the distance from the bottom surface portion 42 increases. When the outer diameter of the side surface portion 43 on the bottom surface portion 42 side is D4, the taper of the outer peripheral surface 43A is (large diameter: outer diameter D3 of the plug-side end surface 41: small diameter: outer diameter D4 on the bottom surface portion 42 side) / (side surface. The height of the portion 43) is set to have a taper ratio of about 1/20. In other words, the outer peripheral surface 43A is a surface having an angle θ1 with respect to the insertion direction of the plug 40 into the pipe body 30 (the direction of the axis L1 of the pipe body 30). Further, the plug 40 is formed by bending a metal, so that a connecting portion 45 between the bottom surface portion 42 and the side surface portion 43 has a curved surface shape corresponding to the plate thickness. With such a configuration, the plug 40 has a shape that tapers toward the bottom surface portion 42 as a whole. The plug 40 is inserted into the plug insertion portion 32 of the pipe body 30 with the bottom surface portion 42 facing the fuel flow passage 31 side.

  Then, an example of the manufacturing method of the fuel delivery pipe 20 of this embodiment is demonstrated. In the method for manufacturing the fuel delivery pipe 20 according to the present embodiment, a pipe body creating process, a plug inserting process, and a sealing process are sequentially performed.

(Pipe body creation process)
In the pipe body creation step, as shown in FIGS. 3 and 4, at one end portion 35A of the pipe-shaped member 35 having the same inner diameter as the diameter D1 of the fuel flow passage 31, an inner diameter D1 larger than the diameter D1 of the fuel flow passage 31 is obtained. A plug insertion portion 32 having a tapered surface 32 </ b> A that increases in diameter toward the end side of the pipe-shaped member 35 is formed along with D <b> 2.

  Specifically, first, as shown in FIG. 3, a pipe-like member 35 having an inner peripheral surface 38 having the same inner diameter as the diameter D <b> 1 of the fuel flow passage 31 is prepared over the entire length. As the pipe-like member 35, an existing steel pipe or the like having a predetermined length can be used. A tool 36 for forming the plug insertion portion 32 is prepared. The tool 36 has an outer shape in which the tip end portion extends the side surface portion 43 of the plug 40 to both sides in the axial direction. In other words, the tip of the tool 36 has a taper of about 1/20, the tip of which has a diameter of D4 or less, and the base of which has a diameter of D3 or more. Shape. The tip of the tool 36 is preferably made of a material that is more difficult to plastically deform than the pipe-shaped member 35.

  Subsequently, the tool 36 is inserted into the pipe-shaped member 35 from the one end portion 35A side (the side opposite to the side where the fuel flow passage 31 is formed later) (see FIG. 3). When the outer peripheral surface 43A of the tool 36 contacts the inner peripheral surface 38 of the pipe-shaped member 35, a force is applied to the one end portion 35A of the pipe-shaped member 35 from the inner peripheral surface 38 side via the tool 36. The one end 35A is plastically deformed radially outward over the entire circumference.

  Further, as shown in FIG. 4, the tool 36 is inserted to a predetermined position with respect to the pipe-shaped member 35, and the pipe body 30 is plastically deformed following the outer shape of the tool 36, thereby The inner peripheral surface 38 of the portion 35A is formed to follow the outer peripheral surface 43A of the plug 40. In other words, the inner peripheral surface of the plug insertion portion 32 is a tapered surface 32A having a taper ratio (about 1/20) similar to that of the outer peripheral surface 43A of the plug 40, and the inner diameter D2 of the pipe body side end surface 33 is It is formed so as to substantially match the outer diameter D3 (D2 = D3). In other words, the tapered surface 32A is formed as a surface that is continuous with an angle θ2 with respect to the inner peripheral surface 38 of the pipe-shaped member 35 (the surface constituting the subsequent fuel flow passage 31). In the present embodiment, the angle θ2 is the same as the angle θ1 formed between the outer peripheral surface 43A of the plug 40 and the axis L1 direction of the pipe body 30 (θ2 = θ1). When the pipe body 30 (plug insertion portion 32) is formed in a desired shape, the tool 36 is pulled out from the pipe body 30. Thus, the creation of the pipe body 30 is completed.

(Plug insertion process)
In the plug insertion step, the plug 40 having an outer diameter D3 larger than the diameter D1 of the fuel flow passage 31 is inserted into the plug insertion portion 32 along the tapered surface 32A.

  Specifically, the plug 40 is assembled to a tool (not shown) that fits into the recess 44 of the plug 40, and the tool 36 is brought close to the pipe body 30, whereby the plug 40 is moved in the direction of the axis L <b> 1 of the pipe body 30. Is inserted into the plug insertion portion 32. At this time, the plug 40 has a tapered shape, and the plug insertion portion 32 has the tapered surface 32 </ b> A, so that the plug 40 can be easily inserted into the plug insertion portion 32.

  The plug 40 is inserted into the plug insertion portion 32, and when the outer peripheral surface 43A of the plug 40 abuts against the tapered surface 32A of the plug insertion portion 32 as shown by a two-dot chain line in FIG. The insertion of the plug 40 into the plug insertion portion 32 is stopped when 41 is substantially flush with the pipe body side end surface 33. Then, the plug 40 is inserted into a predetermined position of the plug insertion portion 32 in such a manner that the plug 40 itself and the pipe body 30 are not plastically deformed. In a state where the plug 40 is inserted at a predetermined position, the outer peripheral surface 43A is locked to the tapered surface 32A, thereby restricting insertion of the plug 40 toward the fuel flow passage 31 side. . In other words, the tapered surface 32A functions as a stopper that restricts the movement of the plug 40. At this time, since the plug 40 and the pipe body 30 are in surface contact with each other, for example, burrs and the like are less likely to occur compared to a configuration in which a corner portion of the plug hits an angle with respect to an inner peripheral surface of the pipe body.

  For example, when the plug 40 is held in a posture in which the longitudinal direction thereof coincides with the horizontal direction although the plug 40 or the pipe body 30 is not plastically deformed, the plug 40 is caused by its own weight. Push into the pipe body 30 to the extent that it does not come off the plug insertion part 32. Then, the outer peripheral surface 43 </ b> A of the plug 40 is locked to the tapered surface 32 </ b> A, so that the plug 40 is assembled to the pipe body 30. In other words, the tapered surface 32 </ b> A functions as a temporary fixing portion that temporarily fixes the plug 40 and the pipe body 30 before the sealing step of permanently fixing the plug 40 and the pipe body 30 as described later. With the plug 40 assembled to the pipe body 30, the fitting between the tool and the plug 40 is released, and the insertion into the plug insertion portion 32 of the plug 40 is completed.

(Sealing process)
In the sealing step, the gap between the outer peripheral surface 43A of the plug 40 inserted into the plug insertion portion 32 and the tapered surface 32A is sealed. Specifically, the outer peripheral surface 43A of the plug 40 and the taper surface 32A of the plug insertion portion 32 are brazed. The sealing step can be performed with the pipe body 30 in a posture in which the direction of the axis L1 coincides with the horizontal direction. According to such an aspect, not only between the plug 40 and the pipe main body 30 but also other components of the delivery pipe 20 assembled to each other (for example, between the pipe main body 30 and the injector mounting portion 21 and the like). , And can be suitably brazed together. The sealing step may be performed with the pipe body 30 in a posture in which the direction of the axis L1 coincides with the vertical direction and the one end 30A side is directed upward. Thus, the plug 40 can be suitably locked to the pipe body 30.

Then, the effect of this embodiment is demonstrated.
According to the present embodiment, before the plug 40 is inserted into the pipe body 30, the plug insertion portion 32 having the tapered surface 32A having a large diameter toward the one end portion 30A is formed. Compared with the method in which the plug 40 is press-fitted into the pipe-like member 35 having the same inner diameter without any continuous, the force applied to the plug 40 or the pipe body 30 in the plug insertion process is reduced, so that the plug 40 or the pipe body 30 The situation where it breaks can be suppressed. In addition, since the plug insertion portion 32 has the tapered surface 32A, it is easy to insert the plug 40 up to a predetermined position along the tapered surface 32A in the plug insertion step, and the taper surface before and during the sealing step. The plug 40 can be locked to the pipe body 30 by using the surface 32A.

  Further, according to the present embodiment, in the pipe body creation step, the tapered surface 32A of the plug insertion portion 32 is formed to follow the outer peripheral surface 43A of the plug 40, and therefore the plug 40 and / or the pipe body 30 in the plug insertion step. The plug 40 can be inserted into the plug insertion portion 32 without plastically deforming, and the force applied to the plug 40 and the pipe body 30 can be further reduced.

  Further, according to the present embodiment, in the pipe body creating step, the plug insertion portion 32 is formed by plastically deforming the one end portion 35A of the pipe-shaped member 35 outward in the radial direction. 35 can be used, and the plug insertion portion 32 can be suitably formed by a simple process.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. The manufacturing method of the fuel delivery pipe 120 of this embodiment differs in the shape of the plug insertion part 132 in a pipe main body preparation process compared with the manufacturing method of the fuel delivery pipe 20 of the said embodiment. In addition, the description which overlaps about the structure, an effect | action, and effect similar to above-described embodiment is abbreviate | omitted.

  In the present embodiment, in the pipe body creation step, the tool 36 is inserted into the pipe-like member 35 to a position where the insertion dimension is about half that of the first embodiment, and the pipe body 130 is inserted into the outer shape of the tool 36. The inner peripheral surface of the plug insertion portion 132 is formed to be slightly smaller than the outer peripheral surface 43A of the plug 40 by plastic deformation following the above. In other words, the inner peripheral surface of the plug insertion portion 132 is tapered (about 1/20) to the same extent as the outer peripheral surface 43A of the plug 40 (θ2 = θ1), while the inner diameter D2 of the pipe body side end surface 33 is It is formed to be smaller than the outer diameter D3 (D2 <D3).

  In this embodiment, in the plug insertion process, when the outer peripheral surface 43A of the plug 40 abuts against the tapered surface 132A of the plug insertion portion 132, the insertion of the plug 40 into the plug insertion portion 132 is not stopped, and the plug 40 is further removed. Press fit into the pipe body 130. Then, the one end 30A of the pipe body 130 is plastically deformed outward in the radial direction, and the plug 40 itself is also plastically deformed in the diameter reducing direction. When the plug side end surface 41 of the plug 40 is inserted to a position that is substantially flush with the pipe body side end surface 33 of the pipe body 130, the insertion (press-fit) of the plug 40 into the plug insertion portion 32 is stopped. Then, although the plug 40 itself and the pipe main body 30 are plastically deformed, the plug 40 has a mode in which the press-fitting allowance is reduced as compared with the case where the plug insertion portion 132 is not formed, that is, the plug insertion process. , The force applied to the plug 40 and the pipe main body 130 is inserted into a predetermined position of the plug insertion portion 132 in a manner in which the force is reduced.

  In the present embodiment, the plug insertion portion 132 is formed in the pipe body creation process, and the plug 40 is press-fitted into the pipe body 130 in the plug insertion process. Therefore, the manufacturing process of the delivery pipe 120 is divided into two stages. As a result, the pipe body 130 is plastically deformed. For this reason, it is possible to prevent the pipe main body 130 from being damaged only in the plug insertion process, as compared with the case where the pipe-shaped member 35 is plastically deformed. Further, in the plug insertion process, it is possible to reduce the force applied to the plug 40 as compared with the case where the plug 40 is press-fitted into the pipe-like member 35, and the situation where the plug 40 is damaged can be suppressed.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. The manufacturing method of the fuel delivery pipe 220 of the present embodiment is different from the manufacturing method of the fuel delivery pipes 20 and 120 of the above-described embodiment in the method of forming the plug insertion portion 232 in the pipe body creation process. In addition, the description which overlaps about the structure, an effect | action, and effect similar to above-described embodiment is abbreviate | omitted.

  In the present embodiment, in the pipe body forming step, the taper surface 232A of the plug insertion portion 232 is replaced with the outer peripheral surface 43A of the plug 40 by a processing method of cutting the inner peripheral surface of the pipe-shaped member 35 instead of a processing method of plastic deformation. It is formed to follow the shape.

  In this embodiment, since the pipe body 30 is not plastically deformed in the pipe body creation process, the force acting on the pipe body 230 is reduced not only in the plug insertion process but also in the pipe body creation process, or The force can be prevented. For this reason, the situation where the pipe main body 230 is damaged suitably can be suppressed.

<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 embodiment, the description has been made using the delivery pipe whose pipe body has a circular cross-sectional shape, but the present invention is not limited thereto. For example, the cross-sectional shape of the pipe body of the delivery pipe may be a polygon. And in such a case, what is necessary is just to set the external shape of a plug suitably according to the cross-sectional shape of a pipe main body.
(2) In the above embodiment, the plug has a bowl shape, but the plug may have a shallow dish shape or a column shape. When the plug has a shallow dish shape, the corner formed on the edge of the plug may be brought into contact with the tapered surface of the plug insertion portion in the plug insertion step.
(3) In the above embodiment, the delivery pipe manufacturing method in which one end of the pipe body is sealed with a plug is exemplified, but the present invention is not limited to this. For example, you may apply to the manufacturing method of the delivery pipe which seals the both ends of a pipe main body with a plug.
(4) In the above embodiment, the method of making the taper rate of the taper surface of the plug insertion portion substantially coincide with the taper rate of the outer peripheral surface of the plug in the pipe body creating step is exemplified, but the present invention is not limited to this. For example, the taper rate of the taper surface of the plug insertion portion is made smaller than the taper rate of the outer peripheral surface of the plug (θ2 <θ1), and the plugs are press-fitted in the plug insertion process, thereby reducing the taper rate of both surfaces. A method of matching may be used.
(5) In the above-described embodiment, the plug and the pipe body are brazed in the sealing step, but the sealing means is not limited to brazing. For example, the plug and the pipe main body may be sealed by welding or may be sealed via another adhesive layer.

20, 120, 220 ... Fuel delivery pipe, 30, 130, 230 ... Pipe body, 30A ... One end, 31 ... Fuel flow path, 32, 132, 232 ... Plug insertion part, 32A, 132A, 232A ... Tapered surface, 35 ... Pipe-shaped member, 35A ... One end, 40 ... Plug, 43A ... Outer peripheral surface

Claims (3)

A fuel delivery pipe manufacturing method comprising: a pipe body having a fuel flow passage therein; and a plug inserted into one end portion of the pipe body and closing the end portion of the fuel flow passage,
A tapered surface having an inner diameter larger than the diameter of the fuel flow passage at one end portion of the pipe-shaped member having the same inner diameter as the diameter of the fuel flow passage and having a diameter larger toward the end side of the pipe-like member. Forming a pipe body by forming a plug insertion portion having a pipe body,
A plug insertion step of inserting a plug having an outer diameter larger than the diameter of the fuel flow passage into the plug insertion portion along the tapered surface;
A method for manufacturing a fuel delivery pipe, comprising: a sealing step for sealing between the outer peripheral surface of the plug inserted into the plug insertion portion and the tapered surface.   2. The method of manufacturing a fuel delivery pipe according to claim 1, wherein, in the pipe body creating step, an inner peripheral surface of the plug insertion portion is formed to follow an outer peripheral surface of the plug.   3. The fuel according to claim 1, wherein, in the pipe body creating step, the plug insertion portion is formed by plastically deforming one end portion of the pipe-shaped member toward a radially outer side. Delivery pipe manufacturing method.

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