JP2016084058A - Manufacturing method of fuel oil feed pipe for automobile and fuel oil feed pipe for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a fuel oil feed pipe for an automobile which has a large strength of a pouring part of the fuel oil feed pipe for an automobile and can be easily manufactured, and to provide the fuel oil feed pipe for the automobile.SOLUTION: A process for forming an inlet part 12 of a fuel oil feed pipe 10 for an automobile includes a process of expanding a diameter of a tip part of a metallic pipe and a process of folding and entering the tip part of the pipe of which the diameter is expanded by a prescribed length with a folding jig formed in a curved shape with a curved inner surface and forming a fuel oil feed pipe inlet part inside wall 15 for an automobile on the inside of the pipe. Further, a process of adhering the fuel oil feed pipe inlet part inside wall 15 for the automobile onto the fuel oil feed pipe inlet part outside wall 16 for the automobile on the tip part of the pipe of which the diameter is expanded and a process of forming a screw part 13 on an overlapped part of the fuel oil feed pipe inlet part inside wall 15 for the automobile and the fuel oil feed pipe inlet part outside wall 16 for the automobile are provided.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for manufacturing a fuel supply pipe for a vehicle in which a double wall is formed at an inlet portion of a fuel supply pipe for a vehicle for injecting fuel from a fuel supply port to a fuel tank for the vehicle, and a fuel supply pipe for a vehicle.

As shown in FIG. 11, a vehicle fuel supply pipe 110 is attached in order to inject fuel from a vehicle body fuel supply port provided in the vehicle body into a vehicle fuel tank.
Fuel is injected into the fuel supply pipe 110 for automobiles by inserting the tip portion 141 of the fuel supply gun 140 into the injection port 111.

  At this time, since the fuel supply gun 140 and the injection port 111 of the automobile fuel supply pipe 110 are in contact with each other, the strength of the injection port 111 is required. Further, a screw portion for attaching the tank cap to the inlet 111 is necessary. Furthermore, there is one in which a retainer 120 is provided inside the inlet 112 of the automobile fuel supply pipe 110 (see, for example, Patent Document 1).

For this reason, as shown in FIG. 12, there is a type in which an inlet portion 212 of an automobile fuel supply pipe 210 is folded inward to be doubled (see, for example, Patent Document 2). In this case, the diameter of the tip of the pipe forming the fuel fuel supply pipe 210 for automobiles is increased, and the portion to be folded back is further reduced in diameter and then bent inward to double the inlet portion 212 and the inlet portion. The inlet 211 at the tip of 212 is formed in a double manner. A screw part 224 for attaching a tank cap is also formed at the inlet 211.
For this reason, the process of forming the injection port 211 is complicated, time-consuming, and cost is increased.

  For this reason, as shown in FIG. 13, there is a type in which a retainer 313 is attached to the inner surface of the inlet portion 312 of the automobile fuel supply pipe 310 to improve the strength of the inlet portion 312 (see, for example, Patent Document 3). However, in this case, the inlet 311 portion is single because the tip of the retainer 313 is not covered, and the strength is low.

JP 2009-18755 A JP-A-9-39591 JP 2001-47875 A

SUMMARY OF THE INVENTION Accordingly, the present invention is to provide a method for manufacturing an automobile fuel supply pipe and an automobile fuel supply pipe, which have a large strength at the injection port of the automobile fuel supply pipe and are easy to manufacture.

In order to solve the above problems, the present invention of claim 1 is directed to a method for manufacturing a fuel refueling pipe for an automobile, in which fuel is injected into a fuel tank from a vehicle body refueling port formed on a vehicle body outer surface.
The step of forming the inlet portion of the fuel supply pipe for automobiles includes the step of expanding the diameter of the tip portion of the metal pipe,
The end of the expanded pipe is bent into a curved shape with a curved inner surface with which the tip of the pipe comes into contact. Forming an inner wall of the fuel supply pipe inlet;
The fuel fuel pipe inlet outside the automobile is formed outside the inlet of the fuel fuel pipe inlet for the automobile, at the tip of the pipe made of metal, facing the inner wall and the outer periphery of the fuel fuel pipe inlet. Overlaying the inner wall of the fuel fuel pipe inlet for the automobile, expanding the diameter of the inner wall of the fuel fuel pipe inlet for the automobile, and closely contacting the outer wall of the fuel fuel pipe inlet of the automobile;
An automobile fuel supply pipe manufacturing method including a step of forming a threaded portion in a portion where an inner wall of an automobile fuel supply pipe inlet and an outer wall of an automobile fuel supply pipe entrance overlap each other.

  According to the first aspect of the present invention, in the method of manufacturing a fuel supply pipe for an automobile in which fuel is injected into the fuel tank from the vehicle body filler opening formed on the outer surface of the vehicle body, the step of forming the inlet portion of the fuel supply pipe for the automobile is a metal A step of expanding a diameter of a tip portion of the pipe made of metal. For this reason, the diameter-enlarged inlet portion of the automobile fuel supply pipe can be formed continuously and integrally from the main body portion of the automobile fuel supply pipe.

  A fuel refueling pipe inlet for automobiles is inserted by bending a predetermined length inside the pipe with a bending jig formed into a curved surface with a curved inner surface with which the pipe tip abuts. Forming the inner wall of the part. For this reason, the bending jig is pressed against the tip portion of the pipe whose diameter has been expanded, so that the tip portion of the pipe is deformed by the curved curved portion of the bending jig, and a predetermined length is formed inside the pipe. Can be folded, and the inner wall of the fuel fuel inlet for the automobile can be formed.

On the outer wall of the fuel fuel pipe inlet for the automobile formed on the outside of the inlet of the fuel fuel pipe for the automobile, at the distal end portion of the metal pipe facing the inner wall of the inlet of the fuel fuel pipe for the automobile, The vehicle fuel supply pipe inlet inner wall is overlapped to expand the diameter of the vehicle fuel supply pipe inlet inner wall so as to closely contact the vehicle fuel supply pipe inlet outer wall.

For this reason, the fuel supply pipe inlet inner wall of the automobile and the fuel supply pipe inlet outer wall of the automobile are continuously integrated, and the vehicle fuel supply pipe inlet inner wall of the automobile fuel supply pipe inlet outer wall There is no gap between the inner wall of the inlet of the fuel fuel pipe for the automobile and the outer wall of the inlet of the fuel fuel pipe for the automobile, so that no crevice corrosion occurs and the inlet of the fuel fuel pipe for the automobile. The strength of the part and the inlet can be increased. Even if the fuel gun comes into contact with the inlet of the fuel supply pipe for automobiles, the inlet has sufficient strength and does not deform.

A step of forming a threaded portion in a portion where the inner wall of the fuel fuel pipe inlet portion of the automobile and the outer wall of the fuel fuel pipe inlet portion of the automobile overlap each other; For this reason, the tank cap can be easily fitted by being fitted into the threaded portion, and the strength of the threaded portion can be improved and the tank cap can be stably held.

  The present invention of claim 2 includes the steps of overlapping the fuel supply pipe inlet inner wall of the automobile, expanding the diameter of the fuel fuel pipe inlet inner wall, and closely contacting the fuel fuel pipe inlet outer wall of the automobile. This is a method of manufacturing an automobile fuel supply pipe, which is a step of bringing both the inner wall of the inlet part of the fuel supply pipe for the automobile and the outer wall of the inlet part of the fuel supply pipe for the automobile into an enlarged diameter.

In the second aspect of the present invention, the step of stacking the fuel supply pipe inlet inner wall of the automobile, expanding the diameter of the fuel fuel pipe inlet inner wall, and closely contacting the fuel fuel pipe inlet outer wall of the automobile In this step, both the fuel supply pipe inlet inner wall of the automobile and the fuel fuel pipe inlet outer wall of the automobile are in close contact with each other while expanding the diameter. For this reason, the fuel fuel pipe inlet inner wall of the automobile can be strongly pressed against the inner surface of the outer wall of the fuel fuel pipe inlet of the automobile, and the inner wall of the fuel fuel pipe inlet of the automobile and the outer side of the fuel fuel pipe inlet of the automobile. There are no gaps between the walls and no crevice corrosion occurs.

  According to the third aspect of the present invention, the end of the continuous portion of the pipe portion where the inner wall of the fuel fuel pipe inlet for the automobile and the outer wall of the fuel fuel pipe inlet for the automobile overlap each other is expanded in a funnel shape. This is a method for manufacturing a fuel supply pipe for automobiles in which an inlet for a fuel supply pipe for automobiles is formed.

According to the third aspect of the present invention, the end of the continuous portion of the pipe portion where the inner wall of the fuel fuel pipe inlet for the automobile and the outer wall of the fuel fuel pipe inlet for the automobile overlap each other is expanded in a funnel shape. An inlet for the fuel refueling pipe was formed. For this reason, it is easy to insert the tip of the fuel gun into the inlet of the fuel supply pipe for automobiles, and the strength of the inlet can be improved.

  In the present invention of claim 4, the metal is made of stainless steel, and the stainless steel is added to ferritic stainless steel with any one kind of Ti, Nb or Zr, or a combination of two or more kinds. Is a method for manufacturing a fuel supply pipe for automobiles in an amount of 0.1 to 0.8% by weight based on ferritic stainless steel.

In the present invention of claim 4, any one type or a combination of two or more types of Ti, Nb or Zr is added to the ferritic stainless steel, and the addition amount is 0.1 to 0. 0 relative to the ferritic stainless steel. Stainless steel that is 8% by weight was used. For this reason, when processing the inlet portion of the fuel supply pipe for automobiles, the stainless steel pipe is not cracked and processing is easy.

The present invention according to claim 5 is a bending jig having a curved curved inner surface with which the tip of the pipe that forms the inner wall of the inlet portion of the fuel supply pipe for an automobile of the expanded pipe is curved. In the step of bending the inner side wall of the fuel fuel pipe inlet part for the automobile into a predetermined length inside the outer wall of the fuel pipe inlet part, the tip of the inner side wall of the fuel fuel pipe inlet part for the automobile is the fuel fuel pipe inlet part for the automobile It is a manufacturing method of the fuel supply pipe for motor vehicles which does not contact the inner surface of an outer wall.

According to the fifth aspect of the present invention, there is provided a bending jig having a curved curved inner surface with which the tip of the pipe that forms the inner wall of the inlet portion of the fuel supply pipe for an automobile of the expanded pipe is curved. In the step of bending the inner side wall of the fuel fuel pipe inlet part for the automobile into a predetermined length inside the outer wall of the fuel pipe inlet part, the tip of the inner side wall of the fuel fuel pipe inlet part for the automobile is the fuel fuel pipe inlet part for the automobile Do not touch the inner surface of the outer wall. For this reason, the step of inserting the inner wall of the inlet of the fuel fuel pipe for the automobile into a predetermined length inside the outer wall of the inlet of the fuel fuel pipe for the automobile is a smooth process. The inner surface and the tip of the inner wall of the fuel oil pipe inlet for the automobile are not damaged, and the rust prevention can be improved.

A sixth aspect of the present invention is a metal fuel supply pipe for automobiles for injecting fuel into a fuel tank from a vehicle body refueling port formed on the outer surface of the vehicle body.
The inlet part of the fuel supply pipe for automobile is composed of the outer wall of the inlet part of the outer part of the fuel supply pipe for automobile and the inner part of the inlet part of the inner part of the fuel supply pipe for automobile formed by bending the outer side wall of the inlet part of the fuel supply pipe for automobile. The inner wall of the inlet of the fuel fuel pipe for the automobile and the outer wall of the inlet of the fuel fuel pipe for the automobile are integrally formed from one continuous pipe, and the inlet of the fuel fuel pipe for the automobile. The vehicle outer fuel supply pipe is characterized in that the outer side wall and the automobile fuel supply pipe inlet inner wall are in close contact with each other and have a threaded portion formed therein.

  According to the present invention of claim 6, in the metal fuel supply pipe for a vehicle for injecting fuel into the fuel tank from the vehicle body fuel supply port formed on the outer surface of the vehicle body, the inlet portion of the fuel supply pipe for the vehicle is an outer vehicle fuel. The fuel supply pipe inlet portion outer wall and the inner vehicle fuel supply pipe inlet portion inner wall formed by bending inward from the vehicle fuel supply pipe inlet outer wall are formed in a double layer. For this reason, the intensity | strength of the inlet part of the fuel supply pipe | tube for motor vehicles can be improved, and a tank cap and a fueling gun can be hold | maintained stably.

Since the inner wall of the inlet part of the fuel fuel pipe for the automobile and the outer wall of the inlet part of the fuel fuel pipe for the automobile are integrally formed from one continuous pipe, the inner wall of the inlet part of the fuel fuel pipe for the automobile and the fuel fuel pipe for the automobile It is easy to manufacture the outer wall of the inlet part, and there is no gap between the inner wall of the inlet part of the fuel supply pipe for automobiles and the outer wall of the inlet part of the fuel oil pipe for automobiles. It is possible to improve the strength and rust prevention of the fuel filler pipe inlet.

The outer wall of the automobile fuel supply pipe inlet and the inner wall of the automobile fuel supply pipe inlet are in close contact with each other. For this reason, the fuel supply pipe inlet inner wall and the fuel supply pipe inlet outer wall of the automobile fuel supply pipe inlet and the vehicle fuel supply pipe inlet inner wall are continuously integrated with each other. There is no gap between the inner wall of the inlet of the fuel supply pipe for the automobile and the outer wall of the inlet of the fuel supply pipe for the automobile, and no crevice corrosion occurs. The strength of the inlet can be increased. Even if the fuel gun comes into contact with the inlet of the fuel supply pipe for automobiles, the inlet has sufficient strength and does not deform.

Since the threaded part is formed in the part where the inner wall of the fuel fuel pipe inlet for the automobile and the outer wall of the fuel fuel inlet for the automobile are in close contact, the tank cap can be fitted into the threaded part of the inlet and easily attached The strength of the threaded portion can be improved at the double formed inlet, and the tank cap can be held stably.

In the seventh aspect of the present invention, the tip of the continuous portion of the inner wall of the inlet portion of the fuel fuel pipe inlet and the outer side wall of the inlet portion of the fuel fuel pipe for the automobile is expanded in a funnel shape. It is a fuel refueling pipe for automobiles having an inlet.

In the present invention of claim 7, the tip of the continuous portion of the inner wall of the inlet portion of the fuel fuel pipe inlet and the outer wall of the inlet portion of the fuel fuel pipe for the automobile is expanded in a funnel shape to Since the injection port is formed, it is easy to insert the tip of the fuel gun into the injection port of the automobile fuel supply pipe, and the strength of the injection port can be improved.

  In the present invention of claim 8, the metal is made of stainless steel, and the stainless steel is ferritic stainless steel added with one or more of Ti, Nb or Zr, and the added amount Is a fuel refueling pipe for automobiles in an amount of 0.1 to 0.8% by weight based on ferritic stainless steel.

In the present invention of claim 8, any one type or a combination of two or more types of Ti, Nb or Zr is added to the ferritic stainless steel, and the addition amount is 0.1 to 0. 0 relative to the ferritic stainless steel. Stainless steel that is 8% by weight was used. For this reason, when processing the inlet part of the fuel supply pipe for automobiles, the inlet part of the fuel supply pipe for automobiles can be obtained in which the stainless steel pipe is not broken.

The inner wall of the inlet of the fuel fuel pipe for the automobile is enlarged at the tip of the metal pipe facing the inner wall of the inlet of the fuel fuel pipe for the automobile, and is closely attached to the outer wall of the inlet of the fuel fuel pipe for the automobile. The vehicle fuel supply pipe inlet inner wall and the vehicle fuel supply pipe inlet outer wall are continuously integrated, and the vehicle fuel supply pipe inlet inner wall is connected to the vehicle fuel supply pipe inlet. It can press strongly against the inner surface of the outer side wall, and there is no gap between the inner wall of the inlet of the fuel supply pipe for the automobile and the outer wall of the inlet of the fuel supply pipe for the automobile. Rust and strength can be increased.

1, showing an embodiment of the present invention, is a cross-sectional view of an inlet portion of an automobile fuel supply pipe. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention, and is a cross-sectional view of a pipe member before manufacturing an inlet portion of an automobile fuel supply pipe in an automobile fuel supply pipe manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention, and is a cross-sectional view of a state in which a tip portion of an automobile fuel supply pipe is enlarged in a manufacturing process of an automobile fuel supply pipe. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, and is a cross-sectional view of a state in which, after a diameter of a tip portion of a pipe member is expanded, a tip end side of the expanded diameter portion is bent inward in a manufacturing process of an automobile fuel supply pipe. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, and is a cross-sectional view of a state in which a diameter of a diameter-enlarged portion is folded inward and an outer diameter-enlarged portion in a manufacturing process of an automobile fuel supply pipe. It is. 1 illustrates an embodiment of the present invention, in an automobile fuel supply pipe manufacturing process, in a state in which a diameter of a diameter-enlarged portion is folded inward and a diameter-enlarged portion on the outside of the expanded-diameter portion. It is sectional drawing of the state which expanded the diameter of the injection port part of the fuel fuel supply pipe for funnels. FIG. 1 shows an embodiment of the present invention, and in a manufacturing process of a fuel supply pipe for an automobile, a fuel for an automobile in a state where the diameter is expanded by combining a portion where the distal end side of the enlarged diameter portion is bent inward and an outer portion thereof. It is sectional drawing of the state which formed the thread part in the inlet_port | entrance part of the oil supply pipe | tube. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention, and is a cross-sectional view of a jig used in a step of expanding a tip end portion of a pipe member in a manufacturing process of an automobile fuel supply pipe. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, and is a cross-sectional view of a jig used in a process of bending the distal end side of an enlarged diameter portion inward in a manufacturing process of an automobile fuel supply pipe. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 illustrates an embodiment of the present invention, and is a cross-sectional view of a jig used in a process of expanding the diameter of a flange portion of a pipe member in a manufacturing process of an automobile fuel supply pipe. It is sectional drawing of the inlet_port | entrance part of the conventional fuel supply pipe for motor vehicles. It is sectional drawing of the inlet_port | entrance part of the other conventional fuel supply pipe for motor vehicles. It is sectional drawing of the inlet_port | entrance part of the other conventional fuel supply pipe for motor vehicles.

  The present invention relates to a method for manufacturing an inlet portion 12 of an automobile fuel supply pipe 10 for injecting fuel into an automobile fuel tank from a vehicle body filling port provided in the body of the automobile, and an automobile fuel supply pipe manufactured by the manufacturing method. 10. The fuel supply pipe 10 for automobiles is made of metal and can be formed of stainless steel having a composition described later.

As shown in FIG. 1, the front end portion of the fuel supply pipe 10 for an automobile is formed in a cylindrical shape from the injection port 11 attached to a vehicle body fuel supply port (not shown) formed on the outer surface of the vehicle body and the injection port 11. The inlet portion 12 is provided. The vehicle fuel supply pipe 10 includes a vehicle fuel supply pipe inclined surface portion 17 whose diameter is gradually reduced from the front end of the inlet portion 12, and a vehicle fuel supply pipe main body portion connected to a fuel tank (not shown). 18.

The inlet portion 12 of the automobile fuel supply pipe 10 is formed of an automobile fuel supply pipe inlet inner wall 15 and an automobile fuel supply pipe inlet outer wall 16 that are formed in close contact with each other. .
A screw part 13 of the fuel supply pipe 10 for the automobile is formed at the inlet 12 of the fuel supply pipe 10 for the automobile so as to protrude in a spiral shape. A tank cap (not shown) attached to the inlet 11 of the automobile fuel supply pipe 10 is screwed to the screw portion 13 of the automobile fuel supply pipe 10.

The inlet 11 of the automobile fuel supply pipe 10 is formed in an integral and continuous double manner by bending the automobile fuel supply pipe inlet inner wall 15 from the automobile fuel supply pipe inlet outer wall 16. The strength is large. Further, the inlet 11 is formed with a funnel-like tip, and the tip of the fuel gun is easily inserted.

Next, a method of manufacturing the inlet portion 12 of the automobile fuel supply pipe 10 will be described with reference to FIGS. 2 to 10 by taking a stainless steel pipe member 20 as an example. In addition to the stainless steel pipe member 20, an iron pipe member 20 can also be used.
First, as shown in FIG. 2, a stainless steel pipe member 20 is used. The pipe member 20 includes one or more of Ti, Nb or Zr added to ferritic stainless steel, and the added amount is 0.1 to 0.8% by weight with respect to the ferritic stainless steel. It is preferable to use stainless steel. When this stainless steel is used, when the tip portion of the pipe member 20 is processed, the stainless steel pipe member 20 is not broken, and the processing is easy.

Next, as shown in FIG. 3, a diameter expanding step is performed so that the diameter of the tip of the pipe member 20 is increased. The diameter expansion step is performed by inserting the first diameter expansion jig 30 shown in FIG. 8 from the tip of the pipe member 20. While holding the first diameter expanding jig 30 by the holding portion 32, it is inserted from the tip of the pipe member 20, and the inner diameter of the pipe member 20 is expanded by the tapered surface 31 of the first diameter expanding jig 30. Expand the diameter.

The diameter expansion is performed for a predetermined length from the tip of the pipe member 20 to form the first diameter expansion portion 21. The first enlarged-diameter portion 21 can be formed with a double inlet portion 12 by folding an automobile fuel supply pipe 10 to be described later, and has a length capable of inserting a retainer or the like. . A funnel-shaped inclined surface portion 25 whose diameter is gradually reduced is formed between the first diameter-expanded portion 21 and the portion of the pipe member 20 where the diameter is not increased. The inclined surface portion 25 of the pipe member 20 forms the inclined surface portion 17 of the automobile fuel supply pipe 10.

Next, as shown in FIG. 4, a step of bending the distal end portion of the pipe member 20 whose diameter has been expanded inside the pipe member 20 is performed. In this step, a bending jig 40 shown in FIG. 9 is used. The bending jig 40 has a bending surface 41 in which a central portion is recessed inward and a corner of the recessed portion is curved. When the tip of the expanded pipe member 20 is brought into contact with the inner surface of the bending surface 41 to hold the holding portion 42 of the bending jig 40 and pressed downward, the expanded pipe member The tip of 20 is bent along the bending surface 41 to form a bent portion 22 that is bent inside the pipe member 20.

At this time, the curvature radius R of the bending surface 41 is preferably about 1 to 8 mm. Within this range, the tip portion of the pipe member 20 can be bent without breaking. In this bent range, the tip of the bent portion 22 of the pipe member 20 can be prevented from coming into contact with the inner surface of the inlet portion of the fuel supply pipe for automobiles. Moreover, the front-end | tip of the bending part 22 of the pipe member 20 may contact the inner surface of the fuel supply pipe inlet part for motor vehicles.

For this reason, the process of inserting the bent portion 22 of the pipe member 20 into the first enlarged diameter portion 21 of the pipe member 20 by bending a predetermined length is smooth, and the outer wall of the inlet portion of the fuel oil pipe for the automobile after manufacture The inner surface of 16 and the tip of the inner wall 15 of the fuel supply pipe inlet for the automobile are not damaged, and the rust prevention can be improved. The bent portion 22 of the pipe member 20 forms an automobile fuel supply pipe inlet inner wall 15, and faces the outer side of the automobile fuel supply pipe inlet inner wall 15 of the first enlarged diameter portion 21 of the pipe member 20. The part forms the outer wall 16 of the fuel fuel inlet for the automobile.

Next, as shown in FIG. 5, a process is performed in which the bent portion 22 bent inside the pipe member 20 is pressed by the first enlarged diameter portion 21 of the opposing pipe member 20 on the outer peripheral side. This uses the first diameter expansion jig 30 shown in FIG. When the first diameter increasing jig 30 is inserted inside the bent portion 22, the bent portion 22 in which the tapered surface 31 of the first diameter expanding jig 30 is bent inward is opposed to the outer peripheral side of the bent portion 22. It is possible to press against the first diameter-expanded portion 21 of the pipe member 20 whose diameter has been increased.

Then, the bent portion 22 and the first enlarged portion 21 of the pipe member 20 with the enlarged diameter facing each other are overlapped, and both are further enlarged to form the second enlarged portion 23. The second enlarged diameter portion 23 of the pipe member 20 forms the inlet portion 12 of the automobile fuel supply pipe 10. The second enlarged diameter portion 23 can form a screw portion 13 for attaching a tank cap (not shown) as will be described later. An injection port 11 into which a fuel gun is inserted is formed in a flange shape at the tip where the screw portion 13 is formed. At this time, only the bent portion 22 can be expanded in diameter and brought into close contact with the second expanded diameter portion 23.

For this reason, the first expanded diameter portion 21 of the expanded pipe member 20 facing the bent portion 22 is formed in close contact with each other, and the fuel supply pipe inlet inner wall 15 for the automobile and the fuel supply pipe inlet for the automobile are formed. A part outer wall 16 can be formed.
Then, the fuel supply pipe inlet inner wall 15 for the automobile and the fuel supply pipe inlet outer wall 16 for the automobile fuel supply pipe are continuously integrated with each other, and the fuel supply pipe inlet inner wall 15 of the car fuel supply pipe inlet outside the vehicle fuel supply pipe inlet. The inner surface of the wall 16 can be strongly pressed. As a result, there is no gap between the fuel supply pipe inlet inner wall 15 for the automobile and the fuel supply pipe inlet outer wall 16 for the automobile, and no crevice corrosion occurs, and the inlet 12 of the automobile fuel supply pipe 10 The strength of the inlet 11 can be increased. Even if the fuel gun comes into contact with the inlet 11 of the automobile fuel filler pipe 10, the inlet 11 has sufficient strength and does not deform.

Next, as shown in FIG. 6, the second enlarged-diameter portion 23, which is a portion where the inner wall 15 of the fuel fuel pipe inlet of the automobile and the outer wall 16 of the fuel fuel pipe inlet of the automobile overlap, is shown in FIG. 10. The holding part 38 of the second diameter expansion jig 36 is held, the insertion part 37 is inserted, and the tip of the second diameter expansion part 23 is inserted into the second diameter expansion jig 36 as shown in FIG. The flange bent portion 39 is expanded in a funnel shape to form the flange portion 24. As shown in FIG. 1, the flange portion 24 serves as the inlet 11 of the automobile fuel supply pipe 10. It is easy to insert the tip of the fuel gun into the inlet 11 and the strength of the inlet 11 can be improved.

Next, as shown in FIG. 7, a step of forming a screw portion 26 in the second enlarged diameter portion 23 is performed. As a result, as shown in FIG. 1, the threaded portion 13 can be formed in a portion where the inner wall 15 of the automotive fuel supply pipe inlet and the outer wall 16 of the automotive fuel supply pipe inlet overlap.

DESCRIPTION OF SYMBOLS 10 Automobile fuel supply pipe 11 Inlet 12 Inlet part 13 Screw part 15 Automobile fuel supply pipe inlet inner wall 16 Automobile fuel supply pipe inlet outer wall 20 Pipe member 40 Bending jig 41 Bending surface

Claims (8)

In a method of manufacturing a fuel refueling pipe for an automobile that injects fuel into a fuel tank from a vehicle body refueling port formed on the outer surface of the vehicle body,
The step of forming the inlet portion of the fuel supply pipe for automobiles includes the step of expanding the diameter of the tip portion of the metal pipe,
The tip of the pipe whose diameter has been expanded is bent to a predetermined length inside the pipe by a bending jig formed into a curved shape with a curved inner surface with which the tip of the pipe abuts. A step of forming an inner wall of the fuel fuel inlet for the automobile,
The fuel supply pipe for automobiles formed on the outer side of the inlet part of the fuel supply pipe for automobiles at the distal end portion of the metal pipe facing the inner wall and the outer peripheral side of the entrance part of the fuel supply pipe for automobiles. The step of overlapping the automobile fuel supply pipe inlet inner wall on the inlet outer wall, expanding the diameter of the automobile fuel oil pipe inlet inner wall, and closely contacting the automobile fuel supply pipe inlet outer wall When,
The manufacturing method of the fuel supply pipe for motor vehicles which has the process of forming a screw part in the part which the said fuel fuel supply pipe inlet_port | entrance inner part for the said vehicle and the fuel fuel supply pipe | tube inlet part outer side wall which adhered closely overlap.   The step of laminating the inner wall of the inlet of the fuel fuel pipe for the automobile, expanding the inner wall of the inlet of the fuel fuel pipe for the automobile, and contacting the outer wall of the inlet of the fuel fuel pipe for the automobile 2. The method of manufacturing a fuel oil pipe for an automobile according to claim 1, which is a step of closely adhering both the inner wall of the fuel oil inlet and the outer wall of the fuel oil inlet of the automobile.   The tip of the continuous portion of the pipe portion that overlaps the inner wall of the inlet of the fuel fuel pipe for the automobile and the outer wall of the inlet of the fuel fuel pipe for the automobile is expanded in a funnel shape to The manufacturing method of the fuel supply pipe for motor vehicles of Claim 1 or Claim 2 in which the injection | pouring part was formed.   The metal is made of stainless steel, and the stainless steel is added to the ferritic stainless steel with at least one of Ti, Nb or Zr, or a combination of two or more. The method for manufacturing a fuel supply pipe for an automobile according to any one of claims 1 to 3, wherein the content is 0.1 to 0.8% by weight. A bending jig formed in a curved surface with a curved inner surface with which the tip of the pipe abuts that forms the inner wall of the inlet portion of the automobile fuel filler pipe of the expanded pipe, In the step of bending the inner wall of the fuel fuel pipe inlet for the automobile into a predetermined length inside the outer wall, the tip of the inner wall of the fuel fuel pipe inlet for the automobile is the inlet of the fuel fuel pipe for the automobile. The manufacturing method of the fuel supply pipe for motor vehicles as described in any one of Claim 1 thru | or 4 which does not contact the inner surface of an outer wall. In a metal fuel refueling pipe for automobiles that injects fuel from a vehicle body refueling port formed on the outer surface of the vehicle body to a fuel tank,
The inlet portion of the automobile fuel fuel supply pipe includes an outer wall of the outer fuel fuel pipe inlet portion of the automobile, and an inner fuel fuel pipe inlet of the inner automobile formed by bending inwardly from the outer wall of the inlet portion of the automobile fuel oil pipe. The automobile fuel supply pipe inlet inner wall and the automobile fuel supply pipe inlet outer wall are integrally formed from a single continuous pipe, and the automobile fuel supply pipe inlet outer wall is formed integrally with the automobile. An automobile fuel oil supply pipe, wherein an outer wall of the fuel oil supply pipe inlet part and an inner wall of the automobile fuel oil supply pipe inlet part are in close contact with each other, and a screw groove is formed. The fuel fuel pipe inlet portion of the automobile fuel oil supply pipe and the front end of the continuous portion of the outer wall of the fuel fuel pipe inlet part of the automobile are expanded in a funnel shape to form an injection part of the fuel fuel pipe for automobile Item 7. A fuel supply pipe for automobiles according to Item 6.   The metal is made of stainless steel, and the stainless steel is added to the ferritic stainless steel with at least one of Ti, Nb or Zr, or a combination of two or more. The fuel oil supply pipe for automobiles according to claim 6 or 7, wherein the content is 0.1 to 0.8% by weight.