JP2003025857A - Structure for mounting cylindrical body to fuel tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide structure for mounting a resin cylindrical body to a resin fuel tank which can easily mount the cylindrical body to the fuel tank using a mechanical connecting means and can be constituted so that it has sufficient fuel gas low permeability. SOLUTION: An annular receiving member 57 is welded and fixed around an opening of the fuel tank 1. On the inner face of the annular receiving member 57, a locking claw 61 is provided so that it projects inward in the radial direction. It is so constituted that when an outward flange 17 of a mounting pipe 15 is fitted into the annular receiving member 57, the lock claw 61 is engaged covering the other side in the axial direction of the outward flange 17 so as to prevent movement of the outward flange 17 to the other side in the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tubular body mounting structure for mounting a tubular body such as a hose mounting pipe or a valve housing to, for example, a fuel tank for a vehicle.

[0002]

2. Description of the Related Art As a fuel tank structure for an automobile gasoline engine, for example, one shown in FIG. 16 is used. Here, an oil supply gun (not shown) is inserted into a filler pipe b attached to the filler hose a, and gasoline fuel is supplied into the fuel tank d through the filler hose a and the attachment pipe c. The gasoline fuel in the fuel tank d is sent to the engine side by the fuel pump e through the feed hose f, and the surplus gasoline is recovered through the return hose g. A communication pipe h is branched from the upper side of the filler pipe b in the figure, and one end (tip end) in the axial direction of the communication hose i connected to the communication pipe h is connected via a communication hose mounting pipe j. It is connected to the fuel tank d, and one end (tip) on the one side in the axial direction of the mounting pipe j extends into the fuel tank d so as to reach the gasoline level when the tank is full. And for the refueling gun,
An automatic refueling stop mechanism (not shown) is configured to operate by detecting that one end of the mounting pipe j in the axial direction is buried in the liquid gasoline fuel, that is, when the gasoline fuel is full. An evaporation hose m is connected to the upper side of the fuel tank d via rollover valves k, k, and the gasoline fuel gas filled in the fuel tank d is sent to the canister through the evaporation hose m. The rollover valves k, k are closed to prevent liquid gasoline fuel from flowing into the evaporation hose m when the vehicle falls.

By the way, the fuel tank d is often made of a thermoplastic resin because it is lightweight, does not rust, and is easily formed into a predetermined shape. A structure in which an HDPE (high density polyethylene) layer forming a surface layer and a gasoline fuel barrier layer such as PA (polyamide) or EVOH (ethylene vinyl alcohol) are laminated with an adhesive is used. Further, for example, HDPE is often used also in the housing of the mounting pipe c for connecting the filler hose a to the fuel tank d and the rollover valve k. If the mounting pipe c and the housing of the rollover valve k are made of HDPE, a mounting structure as described in JP-A-8-268093, that is, a mounting flange is formed on the mounting pipe c and the housing.
This welding flange is directly connected to the HDPE fuel tank d
It is also possible to adopt a mounting structure in which it is welded and fixed to, for example, in the mounting structure shown in FIG.
Is formed in a relatively long HDPE tubular body integrally formed with a welding flange n at approximately the center in the axial direction, and the inner peripheral surface of the tubular body is axially centered from the upper end in the drawing. A metal cylinder o is provided so as to extend downward.
Then, the mounting pipe c thus configured is connected to the HDP
It is inserted into the opening s of the fuel tank d formed by interposing the gasoline fuel barrier layer r made of PA between the surface layer p and the inner layer q made of E, and the welding flange n and the fuel tank d (HD
The surface layer p) made of PE is welded and fixed.

In some cases, for example, the mounting pipe c itself is made of a gasoline resin low-permeability thermoplastic resin such as PA, and the mounting pipe c is attached to the fuel tank d by welding. Although the PA mounting pipe c and the HDPE fuel tank d cannot be directly welded and fixed to each other, Japanese Patent No. 2715870 and German Patent No. 1
No. 9535413 (DE19535413C1) relates to a mounting structure for mounting a PA cylindrical body at an opening position of a fuel tank made of HDPE. The PA cylindrical body is attached via a mounting member or a mounting material (adhesive layer). A technique of welding at the position of the opening of the fuel tank is disclosed, and a mounting structure using a mounting material for welding as shown in FIG. 18 is adopted. In the mounting structure shown in FIG. 18, a modified PA adhesive layer u compatible with PA is formed by welding on one axial side surface (back surface) of the flange t of the PA mounting pipe c. Opening s of fuel tank d, peripheral surface (HDP
The adhesive layer u is welded to the E-made surface layer p), and the attachment pipe c is attached to the fuel tank d.

[0005]

However, as shown in FIG.
In the mounting structure shown in, gasoline fuel permeates into the gap between the mounting pipe c and the peripheral edge or the peripheral portion of the opening s of the fuel tank d,
Gasoline fuel may leak into the atmosphere through the HDPE flange n having insufficient low permeability (see the arrow in FIG. 17). Also in the mounting structure shown in FIG. 18, the modified PA adhesive layer u is the HD of the fuel tank d.
Since the low gasoline fuel permeability is often inferior to that of the PE material, the gasoline fuel may leak into the atmosphere through the adhesive layer u (see the arrow in FIG. 18).

As another mounting structure, it is conceivable to fix the flange t of the mounting hype c to the fuel tank d by using a screw connection. However, if the screw connection is used, the flange t and the fuel tank d may be cracked when the screw is tightened unless the mounting work is carefully performed.

Therefore, according to the present invention, the tubular body can be easily attached to the fuel tank by using the mechanical coupling means, and further, the tubular body can be configured to have a sufficient low fuel gas permeability. An object is to provide a structure for mounting a resin cylindrical body on a resin fuel tank.

[0008]

In order to achieve this object, a tubular body mounting structure for a fuel tank according to the present invention has a structure in which an axial portion of a tubular body made of resin is provided at an opening of a fuel tank made of resin. A tubular body mounting structure for the fuel tank, wherein the tubular body is attached to the fuel tank, and the tubular body is attached to the fuel tank, and the retaining means is formed on the tubular body and protrudes radially outward.
Receiving means provided around the opening of the fuel tank, into which the retaining means of the tubular body is fitted, and when the retaining means of the tubular body is fitted into the receiving means, Stopper means for preventing movement of the tubular body toward the other axial side or removal movement, which is located in the movement path of the retaining means to the other axial side, and the fuel tank and the tubular body. And a sealing means for hermetically sealing the space. In many cases, the retaining means comes into contact with, for example, the surface of the fuel tank (the other side in the axial direction) when it is fitted into the receiving means, and serves to position the tubular body on one side in the axial direction (direction of the fuel tank). Function. It is often the case that one side of the tubular body in the axial direction is formed as an insertion portion and this insertion portion is inserted into the opening of the fuel tank to attach the tubular body to the fuel tank. Can be secured. The retaining means is formed, for example, at the other axial end of the insertion portion, and the insertion portion can be inserted into the opening until the retaining means (removal positioning means) contacts the surface of the fuel tank. The other axial side of the tubular body is usually formed as a hose or tube connection or nipple. By applying the tubular body mounting structure of the present invention, it is composed of a resin-made fuel tank and a resin-made tubular body attached to the opening of the fuel tank by connecting one side in the axial direction. In the fuel tank structure, retaining means that projects radially outward is formed in the tubular body, and in the fuel tank, the retaining means for the tubular body is provided around the opening. Receiving means to be fitted is provided, and further, when the retaining means of the tubular body is fitted into the receiving means, the receiving means is located in a movement path to the other side in the axial direction of the retaining means, Fuel tank structure provided with stopper means for preventing movement or removal movement of the tubular body toward the other side in the axial direction, and sealing means for hermetically sealing between the fuel tank and the tubular body Is configured.

[0009] Usually, the fuel tank is formed in a laminated structure having a surface layer made of HDPE and a fuel gas barrier layer, and the tubular body (including the one having a square cross-section orthogonal to the axial direction) is HDPE. Since it is not necessary to consider the weldability with, it is formed of a resin material having low fuel gas permeability including a retaining means. The retaining means is formed in a tubular body,
In many cases, an integrally formed outward flange is preferable from the viewpoint of simplifying the structure.

The receiving means is formed, for example, in an annular body (including a square shape) surrounding the opening, and the retaining means or the outward flange (including a square shape) has no gap or almost no gap. It is preferable to configure it so as to be fitted therein in order to secure a stable mounting structure. For convenience of molding the fuel tank, the receiving means is usually manufactured separately from the fuel tank and is fixed around the opening prior to mounting the tubular body. As a method of fixing the receiving means, welding around the opening of the fuel tank can be adopted. In this case, as a material of the receiving means, a resin material excellent in weldability to the fuel tank, for example, HDPE. Is usually used. Further, in order to fix it more firmly, as a method of fixing the receiving means, insert molding may be performed around the opening of the fuel tank. In this case, as the material of the receiving means, a resin material having higher rigidity than HDPE can be used in order to secure a higher retaining function for the retaining means.

The stopper means is usually engaged with the retaining means, the outward flange or the outward projecting portion so as to move the retaining means, the outward flange or the outward projecting portion to the other side in the axial direction or the disengagement movement. Block. For example, the stopper means is located on the movement path to the other side in the axial direction by covering the other side surface (surface) in the axial direction of the retaining means, the outward flange or the outward protruding portion, and the stopper means, the outward flange or The movement of the outwardly protruding portion toward the other side in the axial direction or the dislodged movement is prevented. The stopper means is used as a locking claw, and the locking claw is snap-engaged with the retaining means fitted in the receiving means to be positioned in the movement path of the retaining means to the other side in the axial direction. However, the structure of the stopper means can be simplified. More specifically,
The locking claw is pressed by the retaining means that is fitted into the receiving means, deforms and moves radially outward, and when the retaining means is fitted into the receiving means, the movement path of the retaining means toward the other side in the axial direction. It is configured so as to elastically return inward in the radial direction so as to be located at. The deformed movement and elastic return of the locking claw includes, for example, the case where the locking claw moves due to the deformed movement and elastic return of the claw support. Alternatively, the stopper means is attached in a state in which the retaining means is fitted into the receiving means and then inserted into the receiving means, and is positioned in the moving path so as to cross the moving path of the retaining means in the other axial direction. (For example, passing on the other axial side surface of the retaining means), for example, as a locking pin, the fitting resistance of the retaining means may be reduced. Further, the retaining means is an outwardly projecting portion that is formed at a predetermined position in the circumferential direction of the cylindrical body and projects outward in the radial direction, and the stopper means is formed at a predetermined position in the circumferential direction of the annular body as the receiving means. As an inward protruding portion that protrudes inward in the radial direction, the outward protruding portion is housed in the annular body, and the cylindrical body is arranged so that the outward protruding portion corresponds to or matches the circumferential position of the inward protruding portion. When the outward protruding portion is fitted into the annular body by rotating the, the inward protruding portion is located on the moving path of the outward protruding portion to the other side in the axial direction (for example, the outward protruding portion as the retaining means). It is configured so as to cover the other side surface in the axial direction), and the fitting resistance of the retaining means can be reduced, and the mounting work can be simplified.

The sealing means may be, for example, an annular rubber sealing member that hermetically seals between the surface of the fuel tank and the retaining means of the cylindrical body or the outward flange. However, the opening is formed by integrally forming an annular projecting portion projecting and opening inside the tank at a predetermined position of the fuel tank, and the insertion portion formed on one axial side of the tubular body is When the tubular body is attached to the fuel tank by being inserted into the annular protrusion, for example, an annular rubber seal member as a sealing means is arranged between the annular protrusion and the insertion part to dispose the tubular body and the fuel. Airtightness may be provided between the tank and the tank to ensure airtightness and stability of the mounting structure. Both ends of the annular protrusion in the axial direction are open.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
It will be described with reference to FIGS.

FIG. 1 shows a configuration of a gasoline fuel tank side of a first mounting structure form in which the tubular body mounting structure of the present invention is applied to a connection between a gasoline fuel tank of an automobile and a filler hose mounting pipe. FIG. 2 is a sectional view, FIG. 2 is a front view of a filler hose mounting pipe, FIG. 3 is a perspective view of an annular receiving member and a locking claw, and FIG.

The gasoline fuel tank 1 is formed by blow molding, and has an HDPE surface layer (an axially other side surface layer) 3
And an EVOH gasoline fuel barrier layer 7 is interposed between the inner layer 5 and the inner layer 5 (one layer in the axial direction) by using an adhesive.
It has a laminated structure with a thickness of 0 mm. An annular protrusion 9 is integrally formed in the fuel tank 1 so as to protrude and open inside the fuel tank 1, and the formation of the annular protrusion 9 forms an opening in the fuel tank 1.

When the annular protruding portion 9 is formed so as to protrude toward the inside or the inside of the tank, as shown in FIG. 5, the inner peripheral surface B of the annular protruding portion A is a mold C during blow molding.
It is formed by being pressed against (5-1 in FIG. 5). Therefore, unevenness or waviness is unlikely to occur on the inner peripheral surface B, and if the rotary sword D is used to form the axial one side opening 11 in the bottom portion E of the annular protruding portion A to configure the annular protruding portion 9 (FIG. 5). 5-
2) Since the inner peripheral surface 13 has a good flatness of smoothness, when the sealing means is pressed against the annular projecting portion 9 to seal it, the disadvantage of insufficient gasoline fuel sealing does not occur.

Filler hose mounting pipe 15 (cylindrical body)
Is an outward flange 17 (removal preventing means) slightly closer to the other side (outer end side or hose connection side) in the axial direction than the center in the axial direction.
A hose having one side (inside) in the axial direction with respect to the position of the outward flange 17 as an insertion portion 19, and the other side in the axial direction is fitted and connected with a filler hose a (see FIG. 16) on the outside. It is configured as the connection portion 21. Therefore, the outward flange 17 is formed at the other axial end position of the insertion portion 19. Resin such as PA, PPS (polyphenylene sulfide) or POM (polyacetal) can be used for the mounting pipe 15. The hose connecting portion 21 is formed of an insertion end portion 23 and an insertion retaining portion 25 on one side (inner side) in the axial direction with respect to the insertion end portion 23, and the insertion end portion 23 is the other axial direction of the mounting pipe 15. A tapered insertion outer peripheral surface 27 that gradually expands in diameter from one side end toward one axial side, and the mounting pipe 15 from one axial end of this tapered insertion outer peripheral surface 27.
And a cylindrical insertion outer peripheral surface 29 extending in the same diameter toward one side in the axial direction, the insertion retaining portions 25 are formed side by side in the axial direction and gradually expand toward the one side in the axial direction. A first retaining outer surface 31 and a second retaining outer surface 33 each having a right-angled triangular cross section and having a tapered outer peripheral surface, and the first retaining outer surface 33.
A first tubular retaining outer peripheral surface 35 formed between the retaining outer surface 31 and the second retaining outer surface 33 and extending in the same diameter.
And a second tubular retaining outer peripheral surface 37 formed on one axial side of the second retaining outer surface 33 and extending in the same diameter for a long time.
And are equipped with.

When the filler hose a is fitted into the hose connecting portion 21 of the mounting pipe 15, the insertion end portion 23 crosses over the two first and second retaining outer surfaces 31 and 33 and comes into contact with the outward flange 17. The tip end (the one end in the axial direction) of the filler hose a is relatively pushed into the hose connection portion 21. The filler hose a has a first retaining outer surface 3
The first and second retaining outer surfaces 33 sufficiently enter one axial side of the retaining outer surface 33 to secure firm retaining against the filler hose a. Such a retaining structure of the hose connecting portion 21 is suitable when the filler hose a is a resin hose having a relatively large rigidity.

When the filler hose a is a flexible one, for example, a rubber hose, as shown in FIG.
The hose connecting portion 41 of 9 is attached to the other end in the axial direction of the annular projection 4
3 is provided so as to have an outer peripheral surface 45 of the same diameter, and the filler hose a is fitted, and then the filler hose a is fixed to the hose connection portion 41 with a tightening band (not shown) or the like. . The annular protrusion 43 prevents the tightening band or the like from coming off. The annular projection 43 is attached to the mounting pipe 39.
From the other end in the axial direction to the one side in the axial direction, and a tapered outer peripheral surface 47, and one end in the axial direction of the tapered outer peripheral surface 47 from one end in the axial direction of the mounting pipe 39. A radial outer end circumferential surface 49 extending in the same diameter toward the side,
The radial outer end peripheral surface 49 is composed of a diameter-reducing taper-shaped outer peripheral surface 51 which is abruptly reduced in diameter from one end in the axial direction toward one side in the axial direction of the mounting pipe 39. Since the annular protrusion 43 has no acute angle portion, the flexible filler hose a is less likely to be damaged during mounting. The structure of the mounting pipe 39 other than the hose connecting portion 41 is the mounting pipe 15
And PA, PPS or POM can be used for this mounting pipe 39.

The insertion portion 19 of the mounting pipe 15 is formed so as to have a diameter substantially the same as the inner diameter of the annular protruding portion 9 or an outer diameter slightly smaller than the inner diameter of the annular protruding portion 9. It has two annular receiving grooves 53. An annular seal member 55 (sealing means) is fitted in each of the annular receiving grooves 53, and the annular seal member 55 is attached.
When the insertion portion 19 is inserted into the annular protrusion 9,
The insertion portion 19 and the annular protruding portion 9 are hermetically sealed so that gasoline fuel gas does not pass between the insertion portion 19 and the annular protruding portion 9. As a material of the annular seal member 55, for example, FKM (fluorine rubber), NBR (nitrile rubber), NBR / PVC (nitrile rubber / polyvinyl chloride) or FVMQ (fluorosilicone rubber) can be used.

On the surface of the fuel tank 1, a ring-shaped annular receiving member 57 (receiving means) is welded and fixed around the annular protruding portion 9. The annular receiving member 57 is made of a fuel made of HDPE. It is made of HDPE, which has excellent weldability to the surface of the tank 1. Annular receiving member 5
7 is formed so as to have an inner diameter substantially the same as the outer diameter of the outward flange 17 of the mounting pipe 15, and at the four circumferentially equally spaced positions of the annular receiving member 57, the inner surface 59 is axially centered. A locking claw 61 is provided on the other side so as to project radially inward. Locking claw 61
On both sides in the circumferential direction of the
A notch 63 is formed to a depth exceeding the depth, and a pawl support portion 65 which is separated from the annular receiving members 57 on both sides and which can be elastically deformed radially outward is formed, and the other side surface (front surface) 67 of the locking pawl 61 in the axial direction is formed. Is inclined inward in the radial direction from the other axial end surface (front end surface) 69 of the pawl support portion 65 toward the one axial side and extends substantially orthogonal to the axial direction. It is formed so as to substantially intersect the side surface (back surface) 71 at the radially inner end position.

To attach the mounting pipe 15 to the fuel tank 1, the insertion portion 19 is inserted into the annular protrusion 9 until the outward flange 17 is fitted into the annular receiving member 57 and abuts on the surface of the fuel tank 1. . Outward flange 1
7 is fitted into the annular receiving member 57, the locking claw 61 contacts one axial side surface (back surface) of the outward flange 17, but when the outward flange 17 is further pushed, the locking claw 61 is locked. Since the other side surface 67 in the direction is inclined radially inward toward one side in the axial direction, the side surface 67 is pushed outward in the radial direction, and the claw support portion 65 is deformed and moved outward in the radial direction.
Therefore, the outward flange 17 pushes the locking claw 61 away and fits into the annular receiving member 57 (4 in FIG. 4).
1). Since the height of the annular receiving member 57 to the locking claw 61 is formed to be substantially the same as the thickness of the outward flange 17, when the outward flange 17 contacts the surface of the fuel tank 1, the locking claw 61 is formed. Elastically returns to project inward in the radial direction and is covered with the other axial side surface (front surface) of the outward flange 17 to engage or snap-engage with the outward flange 17, and the axial direction of the outward flange 17 The movement to the other side, that is, the escape from the annular receiving member 57 is prevented. Note that reference numeral 73 in the figure is a check valve that releasably closes the axial one side opening 11 of the mounting pipe (15 or the like). In addition, the mounting pipe may be provided after the filler hose a is fitted into the hose connection portion, or the filler hose a.
Is attached to the fuel tank 1 to form a fuel tank structure.

The mounting pipe 39 shown in FIG. 6 is also mounted on the fuel tank 1 in the same form as the first mounting structure.

FIG. 7 is a sectional view showing a second mounting structure according to the present invention.

The gasoline fuel tank 75 is formed by blow molding, and like the gasoline fuel tank 1, the HDPE
EV using adhesive between the surface layer 3 and the inner layer 5 made of
About 10 mm with an OH gasoline fuel barrier layer 7 interposed
However, unlike the fuel tank 1, the opening 77 is formed by simply providing an opening. The fuel tank 75 and the fuel tank 1 have the same structure except the structure of the opening 77. Filler hose attachment pipe 7 attached to the gasoline fuel tank 75
9 (cylindrical body), like the mounting pipe 15, has an outward flange 81 slightly to the other axial side from the center in the axial direction, and one axial side from the outward flange 81 position is the insertion portion. The fuel tank 7 is configured as 83.
Since the opening 77 of 5 is a simple opening, the annular accommodation groove 87 is formed in the one axial side surface (back surface) 85 of the outward flange 81.
2 are formed concentrically, and an annular seal member 89 (sealing means) is fitted into each of the annular receiving grooves 87. The annular seal member 89 seals between the fuel tank 75 and the outward flange 81 so that gasoline fuel gas does not pass therethrough. The mounting pipe 79 has the same configuration and material as the mounting pipe 15 except for the positions where the annular sealing member and the annular housing groove are arranged. The outward flange 81 of the mounting pipe 79 is fitted into the annular receiving member 57 having the same structure as that used in the first mounting structure mode and brought into contact with the surface of the fuel tank 75, and the insertion portion of the mounting pipe 79 is inserted. By inserting 83 into the opening 77, the locking claw 6
A second mounting structure form or a fuel tank structure can be configured in which 1 covers the other side surface (front surface) in the axial direction of the outward flange 81 and is engaged or snap-engaged. The material of the annular seal member 89 is, for example, FKM, NBR, NB.
R • PVC or FVMQ can be used.

FIG. 8 is a sectional view showing a third mounting structure according to the present invention.

The gasoline fuel tank 91 is formed by blow molding, and like the gasoline fuel tank 1, the HDPE
EV using adhesive between the surface layer 3 and the inner layer 5 made of
About 10 mm with an OH gasoline fuel barrier layer 7 interposed
It has a laminated structure of thickness. In the fuel tank 91,
The annular projecting portion 9 is formed so as to project and open inside the fuel tank 91, and the formation of the annular projecting portion 9 constitutes an opening portion in the fuel tank 91.

The annular receiving member 93 (receiving means) fixed to the opening of the fuel tank 91 has a different fixing structure from the annular receiving member 57 used in the first mounting structure, but the other structures are annular. It is the same as the receiving member 57. A ring-shaped annular receiving member 93 is integrally formed at one axial end thereof with an annular embedding portion 95 that extends slightly to one axial side.
The radial outer peripheral surface and the inner peripheral surface of 5 are formed with ridges 97 over the entire circumference at the other axial end and one axial end of the annular embedding portion 95, respectively. The annular receiving member 93 is
The annular embedding portion 95 is insert-molded and attached to the fuel tank 91 so that the surface layer 3 formed in an annular shape around the opening is embedded and fixed in a thick portion.

The mounting pipe used here has the same structure as the mounting pipe 15 used in the first mounting structure, and the outwardly facing flange 17 of the mounting pipe 15 is used.
Is fitted into the annular receiving member 93, and the fuel tank 91
Of the mounting pipe 15 and the insertion portion 19 of the mounting pipe 15 is inserted into the annular protruding portion 9, so that the locking claw 61 covers or engages with the other side surface of the outward flange 17 in the axial direction in the axial direction. A third mounting structure or fuel tank structure can be constructed.

Since the annular receiving member 93 is not attached by welding to the fuel tank 91, a resin material having high rigidity, such as PA or POM, can be used, but the fuel tank 91 and the mounting pipe 15 are sealed. If the moldability is sufficient, HDPE having excellent moldability can be used.

FIG. 9 is an exploded perspective view showing a fourth mounting structure according to the present invention, FIG. 10 is a plan view showing the fourth mounting structure, and FIG. 11 is a sectional view showing the fourth mounting structure. is there.

Fourth mounting structure form (fuel tank structure)
Uses the gasoline fuel tank 1 and the filler hose mounting pipe 15 having the same configuration as that used in the first mounting structure, but the receiving means into which the outward flange 17 of the mounting pipe 15 is fitted and The stopper means is different from that of other mounting structure forms. Here, as the receiving means, a ring-shaped annular receiving member 99, which is welded and fixed around the annular protruding portion 9 and is long or tall in the axial direction, is used. The annular receiving member 99 is HDPE. The fuel tank 1 is made of HDPE having excellent weldability to the surface. The annular receiving member 99 is the outward flange 1 of the mounting pipe 15.
7 has an inner diameter substantially equal to the outer diameter of 7, and the side wall or the peripheral wall 101 of the annular receiving member 99 has
A pin receiving window 103 is formed at a radially symmetrical position. Each of the pin receiving windows 103 is formed by removing a predetermined position in the axial direction of the side wall 101, here, an axial center part, by a predetermined length along the circumferential direction, here about one quarter of the entire circumference, That is, it is formed at a predetermined position in the axial direction of the side wall 101 by being opened by a predetermined length along the circumferential direction, and the edge surfaces 1 of the pin receiving window 103 on both sides in the circumferential direction.
05 is located almost on a straight line. The distance between the axial one end (the surface of the fuel tank 1) of the annular receiving member 99 and the axial one side edge 107 of each pin receiving window 103, that is, the height of the pin receiving window 103 up to the axial one side edge 107. The thickness is substantially equal to the thickness of the outward flange 17 of the mounting pipe 15. On the edge surface 105 on one radial side of each pin receiving window 103,
A step portion, that is, the engaging portion 10 from the center in the radial direction to the outer end.
9 is formed, the step surface of the engaging portion 109, that is, the engaging surface 111 is orthogonal to the edge surface 105, and the step surface 113 is substantially parallel to the edge surface 105.

As the stopper means, a connecting portion 115 curved along the outer periphery of the side wall 101 forming the edge surface 105 on the other side in the radial direction, and left and right extending in parallel at both ends of the connecting portion 115. A stopper member 119 composed of a pair of stopper pins (locking pins) 117 is used, and the interval between the stopper pins 117 is formed to be substantially equal to the interval between the edge surfaces 105 of the respective pin receiving windows 103. . An engaging portion 121 protruding inward is formed at the tip of each stopper pin 117, and the rear surface of the engaging portion 121, that is, the engaging surface 123, is substantially orthogonal to the stopper pin 117. The protrusion amount of the locking portion 121 from the stopper pin 117 is substantially equal to the step amount of the engaging portion 109.

In order to attach the mounting pipe 15 to the fuel tank 1, the outward flange 17 is fitted into the annular receiving member 99 and brought into contact with the surface of the fuel tank 1, and the insertion portion 19 of the mounting pipe 15 is attached to the annular protruding portion 9. Insert inside. After that, the stopper member 119 abuts at least once on the outer surface of the side wall 101 portion where the connecting portion 115 forms the edge surface 105 on the other side, and the stopper pin 117 passes through the pin receiving window 103 along the edge surface 105 to form an annular shape. It is in a state of being inserted into the receiving member 99, and the locking portion 121.
The engaging surface 123 is assembled to the annular receiving member 99 so that the engaging surface 123 engages with the engaging surface 111 of the engaging portion 109.
At the time of assembly, both stopper pins 117 are elastically deformed so as to open slightly when the engaging portion 121 passes through the edge surface 105, but when the engaging portion 121 reaches the engaging portion 109, both stopper pins 117 are released. It elastically returns along the edge surfaces 105 on both sides in the circumferential direction, the locking portion 121 is fitted into the engaging portion 109, and the locking surface 123 and the engaging surface 111 are brought into an engaged state. The intermediate portion of the stopper pin 117 passes through the inside of the pin receiving window 103 and passes over the other side surface in the axial direction of the outward flange 17, engages with the outward flange 17, and the other axial direction of the outward flange 17. The movement toward the side, that is, the movement away from the annular receiving member 99 is prevented. The axial length of the pin receiving window 103, that is, the height, is formed to be substantially the same as or slightly larger than the thickness of the stopper pin 117. Further, similarly to the one-side edge surface 105, the other-side edge surface 105 is also provided with the engaging portion 109, and thus the engaging surface 111 and the step surface 113, so that the stopper member 119 is provided on the one side in the radial direction. And the other side can be inserted into the annular receiving member 99.

FIG. 12 is an exploded perspective view showing a fifth mounting structure form according to the present invention, FIG. 13 is a view for explaining a construction process of the fifth mounting structure form, and FIG. 14 is a cross section of the fifth mounting structure form. Is a figure

Fifth mounting structure form (fuel tank structure)
Uses a gasoline fuel tank 1 having the same configuration as that used in the first mounting structure, but the filler hose mounting pipe, and the receiving means and the stopper means are different from those in other mounting structures. Are different.
Here, the attachment pipe 125 (cylindrical body) has an outward flange 127 in which the shape of the outward flange 17 of the attachment pipe 15 used in the first attachment structure is changed, and the outward flange 127 is Formed by removing the outer peripheral portion of the radially outwardly symmetric position of the outward flange 17,
The flange portion where the outer peripheral portion remains is an outward protruding portion 12
9 (disengagement prevention means). That is, the outwardly projecting portion 129 is formed by forming a portion further projecting outward in the radial direction at a predetermined radial position of the outward flange 127, here at a radial symmetrical position.
The mounting pipe 125 is the first except for the shape of the outward flange.
It has the same structure and material as the mounting pipe 15 of the mounting structure form. Further, as the receiving means, a ring-shaped annular receiving member 131, which is welded and fixed around the annular protruding portion 9, is used. The annular receiving member 131 is attached to the surface of the fuel tank 1 made of HDPE. Is formed of HDPE, which has excellent weldability. The annular receiving member 131 is formed to have an inner diameter substantially the same as the outer diameter of the outward projecting portion 129 of the mounting pipe 125, and is integrally formed on the other side from the axial center of the inner surface 133 at the radially symmetrical position. It has an inward protruding portion 135 formed as stopper means. A gap or a gap having a shape substantially equal to the planar shape of the radially outward portion of the outwardly projecting portion 129 of the mounting pipe 125 is provided between the radially outward ends of the inwardly projecting portions 135 and between the radially outward ends thereof, respectively. 137 is formed. The inner diameter of the inward protruding portion 135 is substantially equal to the outer diameter of the small diameter portion 139 from which the outer peripheral portion of the outward flange 127 is removed, and the inward protruding portion 1 of the annular receiving member 131.
The height up to 35 is approximately equal to the thickness of the outward flange 127.

In order to attach the mounting pipe 125 to the fuel tank 1, the respective outward projecting portions 129 are provided with a gap or a space between the radially outward ends of the inward projecting portions 135 and between the radially outward ends thereof. 137 (1 in FIG. 13
3-1: In FIG. 13, only the mounting pipe 125 and the annular receiving member 131 are shown), the outward flange 127 is housed in the annular receiving member 131, and the insertion portion 19 of the mounting pipe 125 is inserted into the annular protruding portion 9. (13- of FIG. 13
2). Then, since an abutting portion (not shown) is formed on one axial side surface (back surface) of the inward protruding portion 135, until the side end of the outward protruding portion 129 abuts on this abutting portion. Rotate the mounting pipe 125 (13- in FIG. 13).
3). Then, the inward protruding portion 135 covers and engages with the outward protruding portion 129, and prevents the outward flange 127 from moving toward the other side in the axial direction, that is, from coming off from the annular receiving member 131.

By the way, the outward projecting portion is formed asymmetrically in the radial direction, for example, the outward projecting portion 141 is formed only at one position in the circumferential direction, and the other portion of the outward flange 143 is formed in the small diameter portion 145. If the inwardly projecting portion is configured to correspond to the outwardly projecting portion 141 provided asymmetrically, for example, the inwardly projecting portion 147 is continuously formed on the inner surface 133, and one end of the inwardly projecting portion 147 in the circumferential direction is formed. A gap 1 for accommodating the radially outer portion of the outward projecting portion 141 between the other ends.
By forming 49 and providing an abutting portion at the center of the inward protruding portion 147 in the circumferential direction (see FIG. 15), the mounting pipe 15
Whichever side 1 is rotated, the outward protruding portion 141 can be properly fitted into the annular receiving member 153. That is, no matter which side the mounting pipe 151 is rotated, the outward protruding portion 141 and the inward protruding portion 147 are rotated.
Can be engaged so as not to be released by a slight rotation of the mounting pipe 151. Further, if the outwardly projecting portion is formed symmetrically in the radial direction when the contact portion is not formed, the outwardly projecting portion and the inwardly projecting portion can be properly, that is, if the mounting pipe is rotated by approximately 180 degrees. It becomes impossible to engage them stably. Therefore, rotational positioning of the mounting pipe is difficult. However, if the outwardly projecting portion is formed asymmetrically in the radial direction, for example, as shown in FIG. 15, by rotating the mounting pipe 151 by approximately 180 degrees, the outwardly projecting portion 141 and the inwardly projecting portion 141 are rotated. Attach the protruding portion 147 to the mounting pipe 1.
The fitting pipe 151 can be engaged most appropriately so as not to be easily released by the rotation of 51, so that the rotational positioning of the mounting pipe 151 becomes easy.

The components of the first mounting structure form (fuel tank structure) to the fifth mounting structure form (fuel tank structure) can be applied to other mounting structure forms (fuel tank structure). is there. For example, the structure of the hose connecting portion 41 of the mounting pipe 39 shown in FIG. 6 is the mounting pipes 15, 79 of the second mounting structure form (fuel tank structure) to the fifth mounting structure form (fuel tank structure). It is applicable to 125 and 151. Further, for example, the annular accommodation groove 87 at the opening 77 of the fuel tank 75 and the outward flange 81 of the mounting pipe 79 in the second mounting structure form (fuel tank structure).
The configuration of the annular seal member 89 is such that the fuel tanks 1, 91 and the mounting pipes 15, 1 of the third mounting structure form (fuel tank structure) to the fifth mounting structure form (fuel tank structure) are used.
25 and 151 are applicable. Further, for example, the third
In the mounting structure form (fuel tank structure) of No. 5, the annular embedding portion 95 of the annular receiving member 93 and the fuel tank 91 (fixing structure by insert molding) have the fourth mounting structure form (fuel tank structure) and the fifth mounting structure form (fuel tank structure). It is applicable to the fuel tank 1 and the annular receiving members 99, 131, 153 of the mounting structure form (fuel tank structure).

[0040]

As described above, if the tubular body mounting structure for a fuel tank according to the present invention is used, the tubular body can be attached to the fuel tank by a simple operation without lowering the low fuel permeability. You can

In addition, in the tubular body mounting structure for a fuel tank according to the present invention, the tubular body can always be firmly attached to the fuel tank regardless of the material of the tubular body. It also has the advantage of widening the range.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a gasoline fuel tank side of a first mounting structure form in which a tubular body mounting structure for a fuel tank of the present invention is applied to a connection between a gasoline fuel tank of an automobile and a filler hose mounting pipe. Is.

FIG. 2 is a front view of a filler hose mounting pipe.

FIG. 3 is a perspective view of an annular receiving member and a locking claw.

FIG. 4 is a diagram illustrating a process of configuring a first mounting structure form.

FIG. 5 is a diagram illustrating a process of forming an annular protrusion.

FIG. 6 is a cross-sectional view showing a first mounting structure form when the configuration of the hose connecting portion of the mounting pipe is changed.

FIG. 7 is a cross-sectional view showing a second mounting structure form according to the present invention.

FIG. 8 is a cross-sectional view showing a third mounting structure form according to the present invention.

FIG. 9 is an exploded perspective view showing a fourth mounting structure form according to the present invention.

FIG. 10 is a plan view showing a fourth mounting structure form.

FIG. 11 is a cross-sectional view showing a fourth mounting structure form.

FIG. 12 is an exploded perspective view showing a fifth mounting structure form according to the present invention.

FIG. 13 is a diagram illustrating a process of configuring a fifth mounting structure form.

FIG. 14 is a cross-sectional view of a fifth mounting structure form.

FIG. 15 is a view showing a modified example of the fifth mounting structure form.

FIG. 16 is a diagram schematically showing a fuel tank structure for a gasoline engine of an automobile.

FIG. 17 is a cross-sectional view showing a conventional mounting structure for a tubular body.

FIG. 18 is a cross-sectional view showing another conventional mounting structure for a tubular body.

[Explanation of symbols]

1, 75, 91 Fuel tank 9 Annular protrusion (opening) 15, 39, 79, 125, 151 Filler hose mounting pipe (cylindrical body) 17, 81 Outward flange (retaining means) 57, 93, 99, 131, 153 Annular receiving member (receiving means) 55, 89 Annular sealing member (sealing means) 61 Locking claw (stopper means) 77 Opening 119 Stopper member (stopper means) 129, 141 Outward protruding portion (retaining means) 135,147 Inward projection (stopper member)

Claims (15)

[Claims] 1. An attachment of a tubular body to a fuel tank, wherein one side of an axial direction of a resin tubular body is connected to an opening of a resin fuel tank, and the tubular body is attached to the fuel tank. And a retaining means formed on the tubular body and protruding outward in the radial direction, and the retaining means for the tubular body fitted around the opening of the fuel tank. When the receiving means and the retaining means of the tubular body are fitted into the receiving means, the receiving means is located in the movement path to the other axial side of the retaining means, and the other axial direction of the tubular body. A tubular body mounting structure for a fuel tank, comprising: stopper means for preventing movement to the side; and sealing means for hermetically sealing between the fuel tank and the tubular body. 2. A fuel tank in which an insertion portion formed on one axial side of a resin tubular body is inserted into an opening of the resin fuel tank and the tubular body is attached to the fuel tank. A tubular body mounting structure for the fuel tank, the retaining means formed on the tubular body at the other axial end of the insertion portion, the retaining means protruding radially outward, and the opening of the fuel tank. Receiving means provided around the receiving means for fitting the retaining means of the tubular body, and the other axial direction of the retaining means when the retaining means of the tubular body is fitted in the receiving means. A stopper means for preventing the tubular body from moving to the other side in the axial direction, which is located in the moving path to the side, and the fuel tank and the insertion portion of the tubular body and / or the retaining means. Sealing means for hermetically sealing the space between Tubular body structure for mounting a fuel tank characterized by and. 3. The tubular body mounting to a fuel tank according to claim 1, wherein the fuel tank is formed in a laminated structure having a surface layer made of HDPE and a fuel gas barrier layer. Construction. 4. The tubular body for a fuel tank according to claim 1, wherein the tubular body is made of a resin material having a low fuel gas permeability including the retaining means. Body mounting structure. 5. The fuel tank is formed in a laminated structure having a surface layer made of HDPE and a fuel gas barrier layer, and the tubular body is made of a resin material having low fuel gas permeability including the retaining means. It is formed, The cylindrical body attachment structure to the fuel tank according to claim 1 or 2 characterized by things. 6. The tubular body mounting structure for a fuel tank according to claim 1, wherein the retaining means is an outward flange formed on the tubular body. 7. The tubular body mounting structure for a fuel tank according to claim 1, wherein the receiving means is an annular body surrounding the opening. 8. The structure for attaching a tubular body to a fuel tank according to claim 1 or 2, wherein the receiving means is fixed around the opening of the fuel tank. 9. The structure for attaching a tubular body to a fuel tank according to claim 8, wherein the receiving means is fixed by welding around the opening of the fuel tank. 10. The structure for attaching a tubular body to a fuel tank according to claim 8, wherein the receiving means is insert-molded and fixed around the opening of the fuel tank. 11. The stopper means is a locking claw, and the locking claw is snap-engaged with the retaining means fitted in the receiving means, so that the retaining means extends toward the other side in the axial direction. The tubular body mounting structure for a fuel tank according to claim 1 or 2, wherein the tubular body mounting structure is located on a moving path. 12. The stopper means is a locking claw, and the locking claw is deformed and moved radially outward by being pushed by the retaining means fitted in the receiving means, and the retaining means receives the retaining means. When fitted into the means,
The tubular body mounting structure for a fuel tank according to claim 1 or 2, wherein the tubular structure is elastically returned inward in the radial direction so as to be positioned in a movement path to the other side in the axial direction of the retaining means. 13. The stopper means is mounted in a state where the retaining means is fitted into the receiving means and then inserted into the receiving means, and the stopper means traverses a movement path of the retaining means to the other side in the axial direction. The tubular body mounting structure for a fuel tank according to claim 1 or 2, wherein the tubular body mounting structure is located on this moving path. 14. The retaining means is an outwardly protruding portion that is formed at a predetermined position in the circumferential direction of the cylindrical body and projects outward in the radial direction, and the stopper means is a predetermined direction in the circumferential direction of the annular body. A radially inwardly projecting portion formed at a position, the outwardly projecting portion being housed in the annular body, and the outwardly projecting portion corresponding to a circumferential position of the inwardly projecting portion. When the tubular body is rotated so that the outwardly projecting portion is fitted into the annular body, the inwardly projecting portion serves as a movement path to the other axial side of the outwardly projecting portion. The tubular body mounting structure for a fuel tank according to claim 7, wherein the tubular body mounting structure is located. 15. The opening is formed by integrally forming an annular protrusion that protrudes into the inside of the fuel tank and is opened at a predetermined position of the fuel tank. The seal means is inserted into the annular protrusion and attached to the fuel tank, and the sealing means is disposed at least between the annular protrusion and the insertion portion, and the sealing means allows the tubular body and the fuel tank to be connected. The airtightness between is secured,
The structure for mounting a tubular body on a fuel tank according to claim 2, wherein