MXPA98004122A - Covered tube with resin and manufacturing method of the same, and fuel tank with reservoired tube - Google Patents

Abstract

The present invention relates to a tube coated with resin, characterized in that a peripheral surface near an end portion of a tube material is masked through a specific length, and a resin coating layer is formed on a non-mask portion. of a surface of the tube material, and the masked portion is made to be an insertion portion to be inserted to leak-proof liquid in an inner diameter portion of another fitting member, wherein a resin bond portion is formed in an end portion of the resin coating layer, and the resin bonding portion is configured to extend along the insertion portion, said resin bond portion has a wedge-shaped cross section with a coating thickness which gradually becomes thinner towards the end portion of the pipe material, and a total coating thickness of the resin bonding portion is made thinner than a thickness of the resin coating layer, the resin bonding portion is configured to fit within the inner diameter portion of another fitting member together with the insertion portion, a projection in the form of a ring is formed around the resin bond portion, an end surface of the ring-shaped projection extends in a direction perpendicular to an axis of the pipe material, whereby said ring-shaped projection serves as a stop for said other adjustment member, which is connected in the insertion portion and in the connection portion of the

Description

COATED TUBE WITH RESIN AND METHOD -FIGURE OF THE SAME, AND FUEL TANK WITH RESIN COATED TUBE DESCRIPTION OF THE INVENTION The present invention relates to a resin-coated tube, used mainly in a fuel filling pipe of a car and the like, and manufacturing method of the Syrian. Figure 7 is a perspective view showing a fuel tank and a fuel filling tube of a car. The fuel tank 1 is located in a lower portion of the bodywork of an automobile, and the fuel filling pipe 2 is installed to connect to the fuel supply portion 3 provided in the internal bodywork plate and tank 1 made out of fuel. In the course of the fuel filling tube 2, an elastic tube 4, formed of an elastic material, such as rubber, is attached and by the elasticity of this elastic tube 4, the error (difference) in the relative position of the portion 3 fuel supply and fuel tank 1 or vibration is arranged to be absorbed.

As material of the fuel filling tube 2, a material which is excellent in corrosion resistance, such as a stainless steel tube is preferable, but a stainless steel tube is expensive and furthermore, it is scarce in processing capacity, such as bending flexibility, and therefore, a tube material made by carrying out a surface treatment such as electrodeposition or cationic electrodeposition coating on the surface of a steel tube which is cheap and has good locking is normal. J ampility, it is used as a fuel filling tube 2 material. The steel tube material like this is used in such a way that it is subject to the bending process or the like, a resin coating layer such as a polyethylene layer is further formed on the surface thereof, and is formed of Such a way that it consists of a tube coated with resin, in such a way that the corrosion resistance of the same can e * be greatly increased. As a method of forming a resin coating layer in a similarly resin-coated tube, for example, is there such a method that after electrostatically bonding a powder-containing material onto the surface of a tube material,? The material of the tube is heated such that the resin material can be melted to form the resin coating layer or there is such a method that a powder resin material is sprayed and bonded to a previously heated pipe material, and then of this, in addition, the tube material is heated to form a resin coating layer. However, in any method mentioned above, the thickness of the resin coating film is thick (not less than 0.3 mm), and if this thick resin coating layer is applied to an end position of the filling tube 2 of fuel, the insertion of the elastic tube 4 becomes difficult, and consequently, it is necessary to mask the peripheral surface near the end portion of the fuel filling tube 2, through a specified length, in such a way that- the resin coating layer may not be formed. Previously, it has been arranged that first, as shown in Figure 8, the masking element 5 formed approximately in a cylindrical (cup-like) configuration of a material such as a heat-resistant rubber, is applied over the portion of the the material 6 of the tube and then, as shown in Figure 9, a powdered resin material is bonded to the remaining part of the surface of the aterial 6 of the tube and subjected to the heat treatment to form a layer 7 of resin coating, and finally, the masking element 5 is removed to complete the fuel filling tube 2, and as shown in Figure 7 and Figures 9, 10, the portion which has been masked is inserted to the inner diameter portion of the elastic tube 4 as a portion 8 of insertion. However, after the insertion portion 8 of the fuel filling tube 2 has been inserted into the inner diameter portion of the elastic tube 4, it frequently occurs that the elastic tube 4 is slightly displaced in the direction of separation of the tube. insertion portion 8 - under the influence of the shrinkage phenomenon of the elastic tube .4 itself, "the vibration of operation of the vehicle or the like, and consequently, as shown in Figure 10, between the end portion of the coating layer 7 of resin and the elastic tube 4, a separation C is produced. In this portion of the gap C, the insertion portion 8 where the resin coating layer 7 is not formed (material surface 6 of the tube) is exposed to the outside, and in addition, the water can easily enter the separation C and consequently, the possibility that the fuel filling tube 2 may suffer corrosion of the portion of the separation. The present invention can solve this problem, and the object of the invention is to provide a resin coated tube and method of manufacturing thereof in which the presence of corrosion in the insertion portion can be prevented and also * provide a fuel tank that has a high durability and reliability against corrosion in the insertion portion of the fuel filler tube. This object can be obtained according to the present invention by providing a tube coated with resin in do < -where a peripheral surface near an end portion of a tube material is masked through a specific length, and a resin coating layer is formed on a remaining portion of a tube material surface, and the masked portion is in such a way that it consists of an insertion portion to be inserted strongly into an inner diameter portion of another adjustment element, the resin coating layer has its extreme pressurized function and in that portion, a resin bonding portion. which extends along the insertion portion and is capable of being adjusted to the inner diameter portion of another adjustment element together with the insertion portion is formed. According to the resin-coated tube described above, when the insertion portion of the resin coating tube is inserted to the inner diameter portion of another adjustment element, the portion of resin bond formed to the end portion of the resin coating layer is adjusted to the inner diameter portion of another adjustment element together with the insertion portion, such that the resin bond portion can overlap to another adjustment element. Accordingly, even if another adjustment element moves slightly in the direction of separation of the insertion portion of the resin-coated tube, the insertion portion to which the resin coating layer is not formed is not exposed to the resin. outside, in such a way that the presence of corrosion in the insertion part can be prevented. In addition, the object of the invention can be obtained by providing a method of manufacturing a resin-coated tube which comprises a masking step for adjusting a masking element on an end portion of a tube material, the masking element is formed approximately in a cylindrical configuration and having a mold working portion provided in an inner diameter portion on an inlet side thereof, a coating step for forming a resin coating layer on a remaining portion of a surface of the tube material , and a molding step for sliding the masking member in the axial direction toward a portion on which the resin coating layer is formed, to pressurize an end portion of the resin coating layer, by the mold working portion. of the masking element, and to form a resin binding portion which extends throughout of the insertion portion and has the ability to be adjusted to the inner diameter portion of another adjustment portion together with the insertion portion.

According to the method of manufacturing a tube covered with resin, does it mention? When the masking element is slid towards the resin coating layer formed on the tube material, the mold working portion of the masking element is pressed onto the end portion of the resin coating layer, in accordance with the invention. such that the resin binding portion can be formed uniformly and easily by the entire circumference of the end portion of the resin coating layer and consequently, the presence of corrosion in the insertion portion of the tube can be prevented. coated with resin safely. Furthermore, the object of the invention can be obtained by providing a method of manufacturing a resin-coated tube which comprises a masking step for adjusting a masking element on an end portion of a tube material, the masking element. it is formed approximately in a cylindrical configuration from an elastic material and has a press fit portion with an internal diameter to be adjusted by pressurization on the periphery of the tube material, a coating step to form a layer of coating on a remaining portion of a surface of the material of the tube and a step of molding to slide the masking element in the xial direction towards a portion on which the resin coating layer is formed, to pressurize a extreme portion of the resin coating layer by allowing the press fit portion of the masking element run over the end portion of the resin coating layer and form a bonding portion of the resin which extends along the insertion portion and has the ability to be adjusted in an inner diameter portion of another portion of fit together with the insertion portion. According to the method of manufacturing a resin-coated tube mentioned above, by sliding the masking element towards the resin coating layer formed on the tube material, the end portion of the resin coating layer is pressurized and extended scarcely by the pressure adjusting portion of the masking element, such that the bonding portion of the resin can be formed sparingly, uniformly and easily across the entire circumference of the end portions of the resin coating layer. With this method, since it is not necessary to form a special configuration for the press fit portion of the masking element, the configuration of the masking element can be made simple. Also, the object of the invention can be obtained by the provision of a fuel tank with a resin coated tube comprising a resin-coated tube of this invention as a fuel filler tube. According to the fuel tank with resin coating tube described above, since a tube coated with resin with a high corrosion resistance in the connecting portion of the tube is applied as a fuel filler tube, the durability and the Reliability of the entire fuel tank is improved. BRIEF DESCRIPTION OF THE DRAWINGS A preferred embodiment of the present invention will be made clearer by means of the following description with reference to the accompanying drawings, in which: Figures IA to IC show a first embodiment of the present invention, and IA is an II figure showing the masking step, IB is a figure showing the coating e a, and IC is a figure showing the molding step; Figure 2A is a front view of the masking element and Figure 2B is a vertical cross-sectional view of the masking element shown by the arrow IIB-IIB in Figure 2A; Figure 3 is a figure showing the state where the insertion portion of the fuel filler tube is inserted into the elastic tube; Figure 4 is an enlarged figure of the portion IV in Figure 3; Figures 5A to * 5C show a second embodiment of the present invention and 5A is a figure showing the masking step, 5B is a figure showing the coating step, and 5C is a figure showing the molding step; Figure 6 is an enlarged figure of portion VI in Figure 5C; Figure 7 is a perspective view showing a fuel tank and a fuel filling tube of a car; Figure 8 is a figure showing the state where, in the prior art, the masking element is fitted over the end portion of the tube material; "Figure 9 is a figure showing the state where, in the prior art. , the resin coating layer is formed on the remaining portion of the surface of the tube material, Figure 10 is a figure showing the problems in the prior art, the preferred embodiments of the present invention will be described below with reference to The drawings Figures 1A to IC show a first embodiment of the method of manufacturing a resin-coated tube according to the present invention, and show the process for providing, while forming a resin coating layer on the surface of a fuel filling tube 2 shown in Figure 1, an insertion portion 8 wherein a resin coating layer is not formed, in the portion end of the fuel filler tube 2. As material of the fuel filling tube 2, similar to that of the prior art, a tube material 6 in which a surface treatment such as electrodeposition or cationic electrodeposition is carried out on the surface of a material Cheap steel tube with a good pt < > ceases Biity is used. In addition, at the end portion of the tube material 6, a separation retaining portion 10, whose outer diameter expands like a ring, has been previously formed. The masking element 11 for forming an insertion portion 8 by masking the peripheral surface near the end portion of the tube material 6 through a specified length is carried out in approximately a cylindrical (cup-like) configuration ) when using a material such as a heat resistant rubber, as is also shown in Figures 2A, 2B. In the inner diameter portion of the masking member 11, a mold working portion 12, a press fit portion 13 and a recess portion 14 are formed in order from the inlet side. The internal diameter of the pressurized portion 13 is manufactured in such a way that it is of a size that the pipe material 6 can be adjusted slightly by pressurization, and the internal diameter of the recess portion 14 is enlarged from such that the retention portion 10 of the separation at the end portion of the tube material 6;; can produce lib-ie. In addition, the mold working portion 12 is formed as a taper whose inner diameter expands outwards in the axial direction, and the taper or divergence angle thereof adjusts to approximately 30, and depending on the cases, the Angle can also be adjusted to be a smaller angle or a larger angle. The length of the insertion portion 8 formed in the end portion of the tube material 6 is determined by the depth of the masking element 11, that is, the length from the end surface 15 to the bottom surface 16 of the masking element 11. Further, the length in the axial direction of the recess portion 14 must be sufficiently longer than the length of the retention portion 10 of the separation of the material 6 from the tube, but in a case where the retention portion 10 of the - »separation is not provided to tube material 6, it is possible for the recess portion 14 to be omitted and the press fit portion 13 to be formed longer by the corresponding length. In order to form the resin coating layer 7 on the surface of the material 6 of the tube, first, as a masking step shown in Figure 1A, the masking element 11 fits over the end portion of the tube material 6 . At this time, the pipe material 6 is not inserted into the innermost portion of the masking element 11, but is stopped at a position a little before the position where the end portion of the pipe material 6 is brought into contact with the lower surface 16 of the masking element 11. This position is the initial adjustment position of the masking element 11. Further, if the position and length of the recess portion 14 are pre-adjusted in such a way that the position in time when the retaining portion 10 of the separation of the material 6 from the tube reaches the stage portion between the press fit portion 13 and the recess portion 14 of the masking element 11 when pulling the material 6 from the tube afterwards, once the material 6 of the tube is inserted to the innermost portion of the masking element 11, it can be the initial setting position, the deduction of the initial setting position becomes extreme easily easy and improves the operation performance.

Next, as the coating step shown in Figure IB, on the remaining portion of the surface of the tube material 6, the resin coating layer 7 is formed. As mentioned above, the resin coating layer 7 is formed by such a process that after the pulverized resin material such as polyethylene has been electrostatically bonded onto the surface of the tube material 6, the tube material 6 is heated to melt the resin material, or such process, that after the pipe material 6 has been previously heated, the pulverized resin material is sprayed and bonded thereto, and thereafter, the pipe material 6 is further heated to melt the resin material. Thus, if the resin coating layer 7 is formed by melting the pulverized resin material, such as a molding step shown in Figure IC, the masking element 11 is depressed in the x direction. from the initial adjustment position to the portion where the queen coating layer 7 is formed, while the resin coating layer 7 is still hot and soft, to slide the masking element 11 until the end portion of the tube material 6 touches the lower surface 16 of the masking element 11. Consequently, the masking element 11 moves from the initial adjustment position by a distance S, and at the same time, the end portion of the layer 7 of resin coating , is pressurized by the working portion 12 of the mold of the masking element 11. Accordingly, the end portion of the resin coating layer 7, which is still soft, is formed by pressurization to be configured as a taper of the working portion 12 of the mold and in this portion, the union portion 17 of the resin is formed with a cross-section similar to a wedge, the thickness of which of coating gradually grows thinner toward the end portion of the tube material 6. In addition, around the basic portion of the resin bond portion 17, a ring-like and ring-like projection 18 is formed, the resin material driven by the masking element 11. Finally, when the masking element 11 it is removed after the resin coating layer 7 has hardened, the fuel filling tube 2 is completed as a resin coated tube. Then, as shown in Figure 3, the insertion section 8 of the fuel filler tube 2 is inserted into the elastic tube 4 made of rubber. At that time, as shown in Figure 4 on an enlarged scale, the binding portion 17 of the resin formed in the end portion of the resin coating layer 7 is adjusted by pressurizing it to the inner diameter portion. of the elastic tube 4 as a wedge and the ring-like projection 18 touches the end surface of the elastic tube 4. Thus, when the insertion portion 8 of the fuel filler tube 2 is inserted into the elastic tube 4, the bonding portion 17 of the resin formed in the end portion of the resin coating layer 7 fits into the portion of the resin. inner diameter of the elastic tube 4 together with the insertion portion 8, and the bonding portion 17 of the resin overlaps the elastic tube 4, and consequently, if the elastic tube 4 is somewhat displaced in the direction of separation of the direction 8 of insertion of the fuel filling tube 2 under the influence of the contraction of the elastic tube 4 itself, the vibration of operation of the vehicle or the like, does not arise that the insertion portion 8 on which the layer 7 of The resin coating is not formed, it is exposed to the outside and consequently, the presence of corrosion of the portion 8 and insertion is completely prevented. In this first embodiment, the binding portion 17 of the resin is formed by sliding the masking element 11 briefly after the thermal molding of the resin coating layer 7., to form, by pressurizing, the end portion of the resin coating layer 7 with the mold working portion 12 of the masking element 11 and consequently, the bonding portion 17 of the resin can be formed in a uniform manner and easy through the entire circumference of the end portion of the resin coating layer 7, and consequently, the presence of corrosion of the insertion portion 8 of the fuel filler tube 2 can be reliably prevented. In this way, the material of the masking element 11 is not limited to a heat-resistant rubber. Another material is also available, if it is a material which has a certain resistance to heat and a certain resistance to intermittent periodic work and to which the resin material fuid can not easily adhere. In addition, if a grease, a mold release agent or the like are applied to the masking element 11, the adhesion of the resin material can effectively be prevented. Furthermore, even after the resin coating layer 7 has cooled and hardened after the thermal molding of the resin coating layer 7, if a work is such that only the end portion of the coating layer 7 is carried out. of resin, it is heated again to soften in such a way that the masking element 11 can be adjusted and can be slid, the bonding portion 17 of the resin can be formed by pressurization subsequently. Further, in such a way that for example, the masking element 11 is formed of a metal with a good heat retention property, and this metal masking element 11 is heated and pressed on the end portion of the layer 7 of hardened resin coating, the bonding portion 17 of the resin can also be formed by pressurization, while the end portion of the resin coating layer 7 is softened by the heat of the masking element 11.

Furthermore, in this first embodiment, the working portion 12 of the mold of the aspergating member 11 is formed as a taper, but it may or may not be formed in a manner similar to a taper. For example, it can be formed as a ladder, to make the inside diameter thereof a little larger than that of the press fit portion 13. In that case, when the masking element 11 slides and the end portion of the resin coating layer 7 is formed by pressurization, a bonding portion 17 of the resin is formed whose coating thickness is thinner than that of the layer 7 resin coating and is constant. Thus, the binding portion 17 of the resin should be formed in such a way that it can be adjusted in (overlap) to the portion of the. inner diameter of the elastic tube 4 together with the insertion portion 8. On the other hand, Figures 5A to 5C show a second embodiment of the method of manufacturing a tube coated with resin according to the present invention. The tube material 6 shown in these figures is similar to that of the first embodiment and the masking element lia to form the insertion portion 8a by masking the peripheral surface near the end portion of this tube material 6 through a specific length is also formed approximately in a cylindrical form from an elastic material such as a heat resistant rubber, similar to that of the first embodiment. In the inner diameter portion of the masking element a, a press fit portion 13a and a recess portion 14a are formed in order from the inlet side, but the working portion 12 of the mold which is provided in the masking element. 11 of the first mode is not formed. The internal diameter of the pressure adjusting portion 13a is manufactured in such a way that it is of a size that can be slightly adjusted by pressurization on the periphery of the tube material 6 and the internal diameter of the recess portion 14a is enlarged by such that the retaining portion 10 of the separation of the end portion of the tube material 6__ can be free In this embodiment, the length of the insertion portion 8a formed in the end portion of the tube material 6 is also determined by the depth of the masking element Ia, that is, the length of the surface of the end 15a to the lower surface 16a of the masking element Ia In order to form a layer 7a of resin coating on the surface of the tube material 6, First, as a masking step shown in Figure 5A, the masking element Ia fits over the end portion of the tube material 6. At this time, the 6 to the tube is not inserted to the innermost portion of the masking element lia, but stops at a position a little before the position where the end portion of the tube material 6 touches the lower surface 16a of the masking element lia. This position is the initial setting position of the masking element lia. Next, as a coating step shown in Figure 5B, on the resting portion of the surface of the tube material 6, the resin coating layer 7a is formed by melting in a manner similar to that of the first embodiment. Then, if the resin coating layer 7a has been formed, such as a molding step shown in Figure 5C, the masking element lia is pressed, while the resin coating layer 7a is still hot and soft, in the direction from the initial adjustment position to the position where the resin coating layer 7a is formed and the masking member Ia slides to a position where the end portion of the tube material 6 touches the bottom surface 16a of the masking element lia. Consequently, the masking element lia moves from the initial adjustment position by a distance Sa, and as shown in Figure 6, on an enlarged scale, the press fit portion 13a of the masking element 11 runs on the end portion of the resin coating layer 7a and consequently, the end portion of the layer 7a of resin coating, the. which is still soft, is laminated by the pressure-adjusting pressure of the pressure-fitting portion 13a, and in this portion, the bonding portion 17a of the resin is formed which extends sparingly toward the end portion of the material 6 of tube. The thickness of the coating of this bonding portion 17a of the resin gradually grows thinner towards the end portion of the tube material 6, and around the basic portion of the bonding portion 17a of the resin, a projection is formed 18a resembles a collar and resembles a ring with the resin material driven by the masking element lia. In addition, the masking element to which it can be elastically deformed, is slightly enlarged in such a way that the internal and external diameter thereof run on the resin joining portion 17a. Here, if the internal diameter of the pressure adjusting portion 13a of the masking element lia is too narrow in relation to the external diameter of the material 6 of the tube, the resin coating layer 7a is completely separated simultaneously with the sliding of the tube. masking element lia. Accordingly, it is important to set the internal diameter of the press fitting portion 13a 'of the masking element Ia such that the slid masking member I can run over the resin coating layer 7a to barely extend the coating layer 7a of resin. Finally, when the masking element Ia is removed after the resin coating layer 7a has hardened, the fuel filling tube 2a as a resin coated pipe is completed. Then, the insertion portion 8a of this fuel filling tube 2a inserts the elastic tube 4 shown in Figure 7, the resin binding portion 17a is adjusted by pressurization to the inner diameter portion of the elastic tube 4. together with the insert portion 8a to overlap the ring-like projection 18a touches the end surface of the elastic tube 4. Thus, since the binding portion 17a of the resin is pressurized to the inner diameter portion of the elastic tube 4 in an overlapping manner together with the insertion portion 8a of the fuel filling tube 2a, even if the tube 4 elastic is somewhat displaced in the direction of separation of the insertion portion 8a of the fuel filling tube 2a, under the influence of the contraction of the elastic tube 4 itself, the vibration of operation of the vehicle or the like, it does not appear that the Insertion portion 8a on which the resin coating layer 7a is not formed, is exposed to the exterior and, accordingly, "the presence of corrosion of the insertion portion 8a can be completely prevented. In this second embodiment, since the resin binding portion 17a is formed in such a manner that the masking element a is slid briefly after the thermal form of the resin coating layer 7a, and the end portion of the Resin coating layer 7a spans scarcely in the press fit portion 13a of the masking element Ia, the resin binding portion 17a can be formed sparsely, uniformly and easily throughout the circumference of the end portion of the resin. the resin coating layer 7a. In this way, it is not necessary to provide a working portion of the mold 12 in the inner diameter portion of the masking element lia, similarly to that provided in the masking element 11 of the first embodiment, and consequently, the shape of the element masking lia can be made simple. further, some configurations are different than that of the first embodiment and that of the second embodiment to pressurize the binding portion of the resin at the end portion of the resin coating layer. In brief, the point of the present invention is that by sliding the masking element in the axial direction of the tube material 6, the end portion of the resin coating layer is molded by pressurization with the masking element and the connecting portion of the masking element. resin which can be adjusted in the inner diameter portion of another adjustment element together with the insertion portion, is formed in the end portion of the resin coating layer. Also, according to the fuel tank 1 that equips a resin coating tube described in the first embodiment and the second embodiment as its fuel filling tube 2a, since the tube coated with resin with a high resistance to corrosion in the connecting portion (8 or 8a) of the tube is applied as a fuel filler tube, the durability and reliability of the entire fuel tank 1 are greatly improved.

Claims (4)

1. CLAIMS 1. A resin coated tube, characterized in that a peripheral surface near an end portion of a tube material is masked through a specific length, and a resin coating layer is formed on a remaining portion of a surface of the tube material, and the masked portion is made in such a way that it consists of one insertion portion to be inserted strongly into an inner diameter portion of the other adjustment element, the resin coating layer has its end portion pressurized, and in that portion, a binding portion of the resin that extends along the insertion portion and is capable of being adjusted to the inner diameter portion of the other adjustment member together with the insertion portion is formed. A method of manufacturing a tube coated with resin, characterized in that it comprises: - a masking step for adjusting a masking element on an end portion of a tube material, the masking element is formed approximately in a cylindrical configuration and has a mold working portion provided in an inner diameter portion on an inlet side thereof; a coating step for forming a resin coating layer on a remaining portion of a surface of the tube material; and a molding step for sliding the masking member in the axial direction towards a portion on which the resin coating layer is formed, to pressurize an end portion of the resin coating layer by the working portion of the mold of the resin. masking element and to form a bonding portion of the resin which extends along the insertion portion and is capable of being adjusted to an inner diameter portion of another adjustment portion together with the insertion portion. 3. A method of manufacturing a resin-coated tube, characterized in that it comprises: a masking step for adjusting a masking element on an end portion of a tube material, the masking element is formed approximately in a cylindrical configuration from a elastic material and has a press fit portion with an internal diameter to be adjusted by pressurization on the periphery of the tube material; a coating step for forming a resin coating layer on a remaining portion of a material surface of the tube; and a molding step for causing the masking element to be displaced in the axial direction toward a portion on which the resin coating layer is formed, to resurface an end portion of the resin coating layer by allowing the portion The pressure adjustment of the masking element runs on the end portion of the resin coating layer and to form a bonding portion of the resin, which extends along the insertion portion and has the ability to to be adjusted in an inner diameter portion of another adjustment portion together with the insertion portion. 4. The fuel tank with a resin-coated tube characterized in that it comprises a tube coated with resin described according to claim 1, as a filling tube of combus tibie.