JP2019064321A - Resin fuel tank - Google Patents

Abstract

To provide a resin fuel tank which can effectively protect a barrier sheet layer to an external force.SOLUTION: A resin fuel tank includes a resin fuel tank body 35 provided so that an upper half body 45 and a lower half body 46 are joined to each other, a barrier sheet layer 36 which is provided on an inner surface of the fuel tank body 35 and reduces permeation of a fuel from the fuel tank body 35, and a front attachment stay 37 and rear attachment stays 38L and 38R which allow the fuel tank body 35 to be mounted on a vehicle body, where the front attachment stay 37 and rear attachment stays 38L and 38R are provided on the fuel tank body 35 at a position that is separated in a vertical direction with respect to an upper joint surface 47c and a lower joint surface 48c where the upper half body 45 and the lower half body 46 are joined to each other.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a resin fuel tank.

  Conventionally, a resin fuel tank main body provided by joining an upper half and a lower half, a barrier sheet layer provided on substantially the entire inner surface of the fuel tank main body, and reducing fuel permeation, and a fuel tank main body Patent Document 1 discloses a resin fuel tank provided with a mounting stay for mounting the frame. In Patent Document 1, the mounting stay extends outward from the junction of the upper half and the lower half.

Unexamined-Japanese-Patent No. 2007-314072

However, in the above-described conventional resin fuel tank, since the mounting stay is continuous with the junction of the upper half and the lower half, the deflection of the mounting stay caused by the external force is the barrier sheet layer in the vicinity of the junction It is thought to affect the
The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to effectively protect a barrier sheet layer against an external force in a resin fuel tank.

  The present invention relates to a fuel tank body (35, 235) made of resin and provided by joining an upper half (45, 245) and a lower half (46, 246), and the fuel tank body (35, 235) A barrier sheet layer (36) provided on the inner surface of the fuel tank to reduce fuel permeation from the fuel tank body (35, 235), and an attachment stay (37, 38L) for attaching the fuel tank body (35, 235) to a vehicle body , 38R, 237), the mounting stay (37, 38L, 38R, 237) is a combination of the upper half (45, 245) and the lower half (46, 246). It is characterized in that the fuel tank body (35, 235) is provided at a position separated in the vertical direction with respect to the joint surfaces (47c, 48c, 247c, 248c) to be joined.

In the above invention, a plurality of the attachment stays (37, 38L, 38R) may be provided, and the plurality of attachment stays (37, 38L, 38R) may be separated from each other in the vertical and longitudinal directions.
In the above invention, the mounting stays (37, 38L, 38R) may be provided on the upper half (45) and the lower half (46), respectively.

Furthermore, in the above invention, the mounting stays (37, 38L, 38R) are provided at the front mounting stay (37) provided at the front of the fuel tank body (35) and at the rear of the fuel tank body (35). And a rear mounting stay (38L, 38R) provided, the front mounting stay (37) is provided at the left and right central portions of the upper half body (45), and the rear mounting stay (38L, 38R) A pair may be provided on the left and right of the lower half (46).
In the above invention, the mounting stay (37, 38L, 38R) includes a mounting hole (72, 82) through which a fixing tool (39a, 39b) fixed to the vehicle body is inserted, and the mounting stay (37) , 38L, 38R) may be provided with fragile portions (71a, 71b, 83b) in the vicinity of the mounting holes (72, 82).

In the above invention, the fragile portions (71a, 71b, 83b) are grooves provided around the attachment holes (72, 82). According to this configuration, the fragile portion can be compactly provided at a position far from the bonding surface, and the external force acting on the bonding surface from the mounting stay can be reduced, so that the barrier sheet layer can be protected.
Further, in the above invention, the joint surfaces (47c, 48c) are provided on flange portions (47, 48) extending outward of the fuel tank main body (35), and the attachment stays (37, 38L, 38R) ) May include ribs (74, 83) extending from the flanges (47, 48).

According to the resin fuel tank of the present invention, the resin fuel tank main body provided by joining the upper half and the lower half, and the inner surface of the fuel tank main body, the fuel from the fuel tank main body A barrier sheet layer for reducing permeation, and a mounting stay for mounting the fuel tank main body to the vehicle body, the mounting stay being vertically separated from the joint surface where the upper half and the lower half are joined together and joined Positioned on the fuel tank body in position.
According to this configuration, the mounting stay is provided on the fuel tank main body at a position vertically separated from the bonding surface between the upper half and the lower half. The influence of external force can be suppressed. Therefore, the barrier sheet layer can be effectively protected against external force.

Further, a plurality of mounting stays may be provided, and the plurality of mounting stays may be separated from each other in the vertical direction and the front-rear direction. According to this configuration, the external force acting on the fuel tank main body from the plurality of mounting stays can be dispersed in a wide range of the fuel tank main body. Therefore, the barrier sheet layer can be effectively protected against external force.
In the above invention, the mounting stays may be provided on the upper half and the lower half, respectively. According to this configuration, the external force that acts on the fuel tank main body from the plurality of mounting stays is dispersed to the upper half and the lower half. Therefore, the barrier sheet layer can be effectively protected against external force.

Furthermore, in the above invention, the mounting stay includes a mounting stay provided at the front of the fuel tank main body and a rear mounting stay provided at the rear of the fuel tank main body, and the front mounting stay includes the left and right of the upper half. The rear mounting stays may be provided in the center portion, and a pair of rear mounting stays may be provided on the left and right of the lower half. According to this configuration, the external force is dispersed in the front-rear direction from the front mounting stay at the front of the fuel tank body and the rear mounting stay at the rear of the fuel tank body, and is dispersed to the upper and lower halves. Acting on the joint surface. Therefore, the barrier sheet layer can be effectively protected. Further, since the front mounting stay and the left and right rear mounting stays are supported at three points, the fuel tank main body can be firmly mounted effectively with the minimum configuration.
In the above invention, the mounting stay may include a mounting hole through which a fixing tool fixed to the vehicle body is inserted, and the mounting stay may include a fragile portion in the vicinity of the mounting hole. According to this configuration, when an excessive external force is applied, the fragile portion of the mounting stay at a position separated from the joint surface is broken earlier than the joint surface. Therefore, the barrier sheet layer in the fuel tank body can be protected.

In the above invention, the fragile portion may be a groove provided around the mounting hole. According to this configuration, the fragile portion can be compactly provided at a position far from the bonding surface, and the external force acting on the bonding surface from the mounting stay can be reduced, so that the barrier sheet layer can be protected.
In the above invention, the joint surface may be provided on a flange portion extending outward of the fuel tank main body, and the mounting stay may include a rib extending from the flange portion. According to this configuration, the strength and rigidity of the mounting stay can be increased by the flange portion and the rib. Therefore, the fuel tank main body can be firmly supported by the mounting stay.

FIG. 1 is a perspective view of a front portion of a motorcycle according to a first embodiment of the present invention as viewed from the rear left side. It is the perspective view which looked at the fuel tank from the upper left side. FIG. 2 is a cross-sectional view of a fuel tank cut at the center of the vehicle width. It is a left view which shows the state which divided | segmented the fuel tank. It is a schematic diagram which shows the manufacturing process of a fuel tank main body. FIG. 2 is a cross-sectional view showing a configuration of a fuel tank in a plate thickness direction. It is sectional drawing of the part to which an upper half body and a lower half body are joined in a plane part. FIG. 8 is a cross-sectional view showing a state before bonding in FIG. It is the perspective view which looked at the front attachment stay from upper left side. It is XX sectional drawing of FIG. It is the perspective view which looked at the rear attachment stay from the left back side. It is XII-XII sectional drawing of FIG. It is a XIII-XIII sectional view of FIG. It is sectional drawing explaining a process of a nozzle | cap | die mounting cylinder part. It is the figure which looked at the peripheral part of the inner side protrusion part of the nozzle | cap | die fixation part from the inner side of the fuel tank main body. It is sectional drawing which shows the attachment state of the nozzle | cap | die when there is a dimensional error. It is the perspective view which looked at the attachment structure of the fuel tank in a 2nd embodiment from the upper left side. It is a schematic diagram which looked at the attachment structure of a fuel tank from the front side.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description, the directions such as front, rear, left, right and up and down are the same as the directions with respect to the vehicle body unless otherwise specified. Further, a symbol FR shown in each drawing indicates the front of the vehicle body, a symbol UP indicates the upper portion of the vehicle body, and a symbol LH indicates the left side of the vehicle body.

FIG. 1 is a perspective view of a front portion of a motorcycle according to a first embodiment of the present invention as viewed from the rear left side.
In the motorcycle 1, an engine 10 as a power unit is supported by a vehicle body frame F, and a steering system 11 supporting the front wheels 2 in a steerable manner is steerably supported at the front end of the vehicle body frame F and supports a rear wheel (not shown) Swing arm (not shown) is provided on the rear side of the vehicle body frame F. The motorcycle 1 is a saddle-ride type vehicle in which a seat 13 on which a driver sits is provided above a rear portion of a vehicle body frame F.

The vehicle body frame F includes a head pipe portion 14, a pair of left and right main frames 15, 15, a down frame 16, a pair of left and right pivot frames (not shown), and a pair of left and right seat frames 17, 17 (left seat frame (Not shown) and a pair of left and right sub-frames (not shown).
The head pipe portion 14 is provided at the front end of the vehicle body frame F.
The main frames 15, 15 extend rearward from the head pipe portion 14 rearward.
The down frame 16 extends downward from the position below the main frames 15, 15 in the head pipe portion 14, and bends rearward of the front wheel 2 to extend rearward.
The pivot frame extends downward from the rear end of the main frames 15 and 15 and is connected to the rear end of the down frame 16.
The seat frames 17, 17 extend rearward from the rear end of the main frames 15, 15.
The sub-frame extends rearward and upward from the pivot frame and is connected to the rear of the seat frames 17.

The steering system 11 includes a steering shaft 20 pivotally supported by the head pipe portion 14, a top bridge 21 fixed to the upper end of the steering shaft 20, a bottom bridge 22 fixed to the lower end of the steering shaft 20, and a top bridge 21. And a pair of left and right front forks 23, 23 supported by the bottom bridge 22, and a steering handle 24 fixed to the top bridge 21.
The front wheel 2 is pivotally supported by lower end portions of the front forks 23, 23. The front fender 25 is supported by the bottom bridge 22.

The engine 10 is located below the main frames 15, 15, and is disposed between the down frame 16 and the pivot frame in the vehicle longitudinal direction.
The seat 13 is disposed above the seat frames 17, 17 and supported by the seat frames 17, 17.
The fuel tank 30 (resin tank) is disposed above the main frames 15, 15 along the main frames 15, 15 and supported by the main frames 15, 15. The fuel tank 30 is disposed between the head pipe portion 14 and the seat 13 in the longitudinal direction of the vehicle. The front end of the seat 13 covers the upper surface of the rear of the fuel tank 30 from above.

FIG. 2 is a perspective view of the fuel tank 30 as viewed from the upper left side.
As shown in FIG. 1 and FIG. 2, the top surface of the front of the fuel tank 30 is provided with a filler opening 31. A tank cap 32 is attached to the filler port 31, and the filler port 31 is closed by the tank cap 32.
Attached to the fuel tank 30 is a tray 33 surrounding the filler opening 31 from the periphery. The tray 33 is disposed between the lower end of the tank cap 32 and the upper surface of the fuel tank 30.
The tray 33 is provided with a drain pipe 33a extending downward. The fuel spilled at the time of refueling or the like is received by the tray 33 and drained downward from the drain pipe 33a.

FIG. 3 is a cross-sectional view of the fuel tank 30 cut at the center of the vehicle width. FIG. 4 is a left side view showing the fuel tank 30 divided.
Referring to FIGS. 2 to 4, the fuel tank 30 includes a resin fuel tank main body 35 (tank main body) and a barrier sheet layer 36 provided on substantially the entire inner surface of the fuel tank main body 35.
The barrier sheet layer 36 is formed of a material having a fuel permeability smaller than that of the material of the fuel tank body 35. The barrier sheet layer 36 prevents fuel such as gasoline stored in the fuel tank 30 from permeating the fuel tank 30 and leaking to the outside.

A front mounting stay 37 (mounting stay) protruding forward is provided at an upper portion of a front portion of the fuel tank main body 35.
The front portion of the fuel tank body 35 is fixed to the upper surface of the rear portion of the head pipe portion 14 by a tank fixture 39a (a fixture, see FIG. 1) which is inserted into the front mounting stay 37 from above.
At the lower part of the rear portion of the fuel tank main body 35, a pair of left and right rear mounting stays 38L and 38R (mounting stays) are provided.
The main frames 15, 15 are provided at the rear with tank stays 15a, 15a (FIG. 1) extending upward.
The rear portion of the fuel tank main body 35 is fixed to the tank stays 15a, 15a by tank fixing members 39b, 39b (fixing members, see FIG. 1) which are respectively inserted into the rear mounting stays 38L, 38R from the outside in the vehicle width direction.

The fuel tank main body 35 is provided with a cylindrical injection portion 40 for fuel injection (for liquid injection) in the upper part of the front. The cylindrical injection portion 40 is a cylinder extending in the vertical direction, and the upper end portion of the cylindrical injection portion 40 forms an oil supply port 31.
The cylindrical injection portion 40 is made of the same resin material as that of the fuel tank body 35, and is integrally formed with the fuel tank body 35.
As shown in FIG. 2, a metal cap 41 (not shown in FIGS. 3 and 4) is attached to the cylindrical injection portion 40. The base 41 is fixed to the upper surface of the fuel tank main body 35 by a plurality of base fixing tools 42 (fixing tools) inserted from above.
In addition, the fuel tank main body 35 has a pump mounting opening 44 to which the fuel pump 43 is attached on the lower surface.

  The fuel tank main body 35 includes an upper half 45 (divided body, one divided body) which constitutes an upper portion of the fuel tank main body 35 and a lower half 46 (divided body, which constitutes a lower portion of the fuel tank main body 35). And the other divided body). The fuel tank main body 35 is formed in a tank shape by joining the upper half 45 and the lower half 46.

The upper half body 45 is formed in the shape of a case whose lower surface opens downward. The peripheral edge portion of the opening on the lower surface of the upper half 45 is an upper joint 47 (flange portion) joined to the lower half 46. When viewed from the side of the vehicle, the upper joint portion 47 includes a flat portion 47a that extends substantially horizontally at the rear, and a slope portion 47b that is inclined with respect to the flat portion 47a and extends forward and upward.
The front mounting stay 37 is provided at the front end of the upper half 45. The cylindrical injection portion 40 is provided on the upper surface of the front of the upper half 45.

The lower half 46 is formed in the shape of a case whose upper surface opens upward. The peripheral edge portion of the opening on the upper surface of the lower half body 46 is a lower joint portion 48 (flange portion) joined to the upper half body 45. In the vehicle side view, the lower joint portion 48 includes a flat portion 48a parallel to the flat portion 47a and a slope portion 48b parallel to the slope portion 47b. The flat portion 47a is joined to the flat portion 48a, and the sloped portion 47b is joined to the sloped portion 48b.
The rear mounting stays 38 </ b> L and 38 </ b> R are provided at the rear of the lower half 46. The pump mounting opening 44 is provided on the lower surface of the lower half 46.

Specifically, the upper half 45 and the lower half 46 are formed by the lower bonding surface of the upper bonding portion 47 of the upper half 45 and the lower bonding of the lower half 46. It integrates by welding in the part which the lower side joint surface 48c (joining surface) comprised by the upper surface of the part 48 unites.
The barrier sheet layer 36 includes an upper barrier sheet layer 36 a (one barrier sheet layer) coupled to the inner surface of the upper half 45 and a lower barrier sheet layer 36 b (the other barrier coupled to the inner surface of the lower half 46). Sheet layer).

FIG. 5 is a schematic view showing a manufacturing process of the fuel tank main body 35. As shown in FIG.
Referring to FIG. 5, a plurality of materials constituting barrier sheet layer 36 are supplied to die 51 for extrusion molding, and sheet-like formed body 50 is extruded from die 51.
The formed body 50 is shaped by the vacuum forming machine 52 into a shape along the inner surface of the fuel tank main body 35. The shaped barrier sheet layer 36 is trimmed at its peripheral portion by a trimming die (not shown).
The trimmed barrier sheet layer 36 is set in an injection molding die 53 for molding the fuel tank body 35 and integrated with the fuel tank body 35 when the fuel tank body 35 is injection molded. That is, the barrier sheet layer 36 is bonded to the inner surface of the fuel tank main body 35 by insert molding.

Here, the upper barrier sheet layer 36a and the lower barrier sheet layer 36b are formed separately.
The upper barrier sheet layer 36 a is bonded to the upper half 45 during injection molding of the upper half 45, and the lower barrier sheet layer 36 b is bonded to the lower half 46 during injection molding of the lower half 46. Ru.
Thereafter, the upper joint surface 47 c and the lower joint surface 48 c are melted by heating, and the upper joint surface 47 c and the lower joint surface 48 c are pressure-bonded to integrate the upper half 45 and the lower half 46. Ru.

FIG. 6 is a cross-sectional view showing the configuration of the fuel tank 30 in the plate thickness direction.
The fuel tank 30 is configured in six layers by one layer of the fuel tank main body 35 and the barrier sheet layer 36 configured of five layers.
The barrier sheet layer 36 includes a barrier layer 55, adhesive layers 56, 56 provided on both sides of the barrier layer 55, and outer layers 57a, 57b adhered to both sides of the barrier layer 55 via the adhesive layers 56, 56. .

The material of the fuel tank main body 35 is, for example, high density polyethylene (HDPE).
The barrier layer 55 is made of a material that is less likely to transmit fuel than high density polyethylene. The barrier layer 55 is made of, for example, an ethylene-vinyl alcohol copolymer (EVOH).
The outer layers 57a and 57b are made of the same material as the fuel tank main body 35, and are made of, for example, high density polyethylene.

The barrier sheet layer 36 is coupled to the inner surface of the fuel tank main body 35 via the outer layer 57 a on the fuel tank main body 35 side. The barrier sheet layer 36 is bonded to the inner surface of the fuel tank main body 35 through the outer layer 57a made of the same material as the fuel tank main body 35, so the adhesion to the fuel tank main body 35 is high and the fuel tank main body 35 is firmly Combined.
In the barrier sheet layer 36, the outer layer 57b is exposed in the fuel tank body 35 to be in contact with the fuel. Thus, direct contact of the fuel with the barrier layer 55 is prevented.

FIG. 7 is a cross-sectional view of a portion where the upper half 45 and the lower half 46 are joined in the flat portions 47a and 48a.
The upper joint portion 47 is formed in a flange shape projecting from the outer surface of the upper half 45 to the outside of the fuel tank main body 35. The upper joint 47 is provided over the entire circumference of the upper half 45.
The width W1 of the upper joint portion 47 is larger than the thickness t1 of the side wall 45a (wall) of the upper half 45.
A pressing surface 47 d parallel to the upper bonding surface 47 c is formed on the top surface of the tip of the flange-like upper bonding portion 47.

The upper half 45 further includes a peripheral rib 47 e extending upward from the top of the tip end surface of the upper joint 47. The peripheral rib 47 e is provided over substantially the entire circumference of the upper half 45.
The pressing surface 47 d is a bottom surface of the groove 58 formed between the peripheral rib 47 e and the outer surface of the upper half 45.
The upper half 45 is pressed against the lower joint surface 48c of the lower half 46 by the pressing jig J1 engaged with the groove 58 and pressing the pressing surface 47d.
The pressing surface 47d overlaps the upper bonding surface 47c in the pressing direction P of the pressing jig J1. For this reason, the upper joint surface 47c can be directly pressed by the pressing jig J1, and the pressure bonding can be performed favorably.

The lower joint portion 48 is formed in a flange shape projecting from the outer surface of the lower half body 46 to the outside of the fuel tank main body 35. The lower joint 48 is provided over the entire circumference of the lower half 46.
The width W2 of the lower joint 48 is larger than the thickness t2 of the side wall 46a (wall) of the lower half 46.
A pressing surface 48 d parallel to the lower bonding surface 48 c is formed on the lower surface of the tip of the flange-shaped lower bonding portion 48.

The lower half 46 also includes a peripheral rib 48 e extending downward from the lower portion of the tip end surface of the lower joint 48. The peripheral rib 48 e is provided over substantially the entire circumference of the lower half 46.
The pressing surface 48 d is a bottom surface of the groove 59 formed between the peripheral rib 48 e and the outer surface of the lower half 46.
The lower half 46 is pressed against the upper joint surface 47c of the upper half 45 by a pressing jig J2 which engages with the groove 59 and presses the pressing surface 48d.
The pressing surface 48d overlaps the lower bonding surface 48c in the pressing direction P of the pressing jig J2. Therefore, the lower bonding surface 48c can be directly pressed by the pressing jig J2, and the pressure bonding can be performed satisfactorily.
The pressing direction P is the joining direction of the upper half 45 and the lower half 46.

An edge of the upper barrier sheet layer 36a is provided in the vicinity of the upper bonding surface 47c, and a bent portion 61 which bends toward the outside of the fuel tank main body 35 is formed on the edge.
The bending portion 61 bends substantially at right angles with respect to the main body portion 36 a 1 of the upper barrier sheet layer 36 a along the inner surface of the upper half 45.

Specifically, the bent portion 61 is embedded in the inner surface of the upper half 45 at a position spaced upward by a distance D from the upper joint surface 47 c. The bent portion 61 extends to the outside of the fuel tank main body 35 in parallel with the upper joint surface 47 c.
The bending portion 61 is disposed between the pressing surface 47 d and the upper bonding surface 47 c in the pressing direction P. The length of the bent portion 61 is smaller than the thickness t1 of the side wall 45a.

An edge of the lower barrier sheet layer 36b is provided in the vicinity of the lower bonding surface 48c, and a bent portion 62 which bends toward the outside of the fuel tank main body 35 is formed at the edge.
The bending portion 62 bends substantially at right angles with respect to the main body portion 36 b 1 of the lower barrier sheet layer 36 b along the inner surface of the lower half 46.

Specifically, the bent portion 62 is embedded in the inner surface of the lower half 46 at a position spaced downward by a distance D from the lower joint surface 48 c. The bent portion 62 extends to the outside of the fuel tank main body 35 in parallel with the lower joint surface 48 c.
The bending portion 62 is disposed between the pressing surface 48 d and the lower bonding surface 48 c in the pressing direction P. The length of the bent portion 62 is smaller than the thickness t2 of the side wall 46a.

The bent portions 61 and 62 are formed by cutting the bent portion of the peripheral portion of the formed body 50 formed during shaping by the vacuum forming machine 52 (FIG. 5) with the cutting edge of the trimming die (see paragraph 0023). It is formed by trimming. At the tips of the bent portions 61 and 62, cut surfaces 61a and 62a trimmed in the thickness direction of the bent portions 61 and 62 by the cutting edge are formed. Thus, the bent portions 61 and 62 can be easily formed, and the bent portions 61 and 62 can be formed with high accuracy.
The bent portions 61 and 62 are embedded in the upper half 45 and the lower half 46 when the upper half 45 and the lower half 46 are formed by the injection molding die 53 (FIG. 5). Thus, the bent portions 61 and 62 can be easily embedded.

FIG. 8 is a cross-sectional view showing a state before bonding in FIG.
As shown in FIG. 8, in the state before bonding, the upper bonding portion 47 is formed thick in the pressing direction P by an amount of the crimping margin L1 and the melting margin L2.
Similarly, the lower bonding portion 48 is formed thick in the pressing direction P by the amount of the crimping margin L1 and the melting margin L2 before bonding.

The melting margin L2 is a portion which is melted when the upper joint portion 47 and the lower joint portion 48 are heated to the portion of the crimping margin L1, and is not left in the finished product of the fuel tank main body 35.
The crimping margin L1 is a portion to be crimped at the time of welding, and a part of the crimping margin L1 protrudes from the upper joint surface 47c and the lower joint surface 48c due to pressure, and the protruding portions 63 and 63 (FIG. 7) Become.

The bent portions 61 and 62 of the barrier sheet layer 36 are vertically separated from the outer protruding portion 63.
In the first embodiment, the bent portions 61 and 62 of the barrier sheet layer 36 are vertically separated from the upper bonding surface 47 c and the lower bonding surface 48 c, respectively, and the upper bonding surface 47 c and the lower bonding surface It is not welded to 48c. Thus, when welding between the upper bonding surface 47c and the lower bonding surface 48c, it is not necessary to control welding of the upper barrier sheet layer 36a and the lower barrier sheet layer 36b, so the upper half 45 and the lower half 46 can be easily welded.
Further, there is a region where the barrier sheet layer 36 does not exist between the bent portion 61 and the bent portion 62, but since this region is small, permeation of fuel from this region to the outside is allowed.

  As shown in FIG. 8, the upper joint portion 47 and the lower joint portion 48 respectively have projecting portions that extend from the ends of the peripheral ribs 47 e and 48 e in the pressing direction P to the tip of the melting margin L2. The length of the protrusion portion is a protrusion dimension L3. The projection dimension L3 is a length in a direction orthogonal to the upper joint surface 47c and the lower joint surface 48c. For example, the protrusion dimension L3 may be a length from the pressing surfaces 47d and 48d to the tip of the melting margin L2.

As shown in FIG. 4, when moving the upper half 45 and the lower half 46 in the pressing direction P along with welding, the flat portion 47a of the upper joint 47 and the flat portion 48a of the lower joint 48 are parallel. In this state, the size of the gap G between the upper joint surface 47c and the lower joint surface 48c is equal at any place. That is, the gap G between the plane portion 47a and the plane portion 48a and the gap G between the sloped portion 47b and the sloped portion 48b are equal in size. Here, the gap G is a gap in the pressing direction P. Therefore, the pressing force in the pressing direction P can be uniformly applied to the entire upper joint portion 47 and the lower joint portion 48.
Further, the projection dimension L3 is equal over the entire circumference of the upper joint portion 47 and the entire circumference of the lower joint surface 48c.

Since the slopes 47b and 48b are inclined with respect to the pressing direction P, the pressing force acting on the slopes 47b and 48b at the time of welding is smaller than the pressing force acting on the flat portions 47a and 48a.
In the first embodiment, referring to FIG. 7, the widths W3 (portions of phantom lines in FIG. 7) of the upper joint 47 and the lower joint 48 in the slopes 47b and 48b (FIG. 4) are , And the widths W1 and W2 of the flat portions 47a and 47a.
As a result, the areas of the upper joint surface 47c and the lower joint surface 48c at the slopes 47b and 48b decrease, and the surface pressure of the slopes 47b and 48b due to the pressing force in the pressing direction P increases. As a result, the surface pressure acting on the entire upper joint 47 and lower joint 48 can be made uniform, and welding can be performed satisfactorily.

Next, the structure of the front mounting stay 37 and the rear mounting stays 38L and 38R will be described.
FIG. 9 is a perspective view of the front mounting stay 37 as viewed from the upper left side. FIG. 10 is a cross-sectional view taken along line X-X of FIG.
9 and 10, the front mounting stay 37 is provided at the center of the fuel tank main body 35 in the width direction (vehicle width direction) at the front end of the upper half 45 and in front of the fuel inlet 31. To position.
The front mounting stay 37 includes a vertical wall 70 extending upward from the front edge of the upper surface of the upper half 45, a plate-like front extension 71 extending forward from the upper end of the vertical wall 70, and a front extension The mounting hole 72 which penetrates the protrusion part 71 up and down in the plate | board thickness direction is provided.

The vertical wall portion 70 is formed in a plate shape extending upward along the front edge of the upper surface of the upper half 45. The rear surface of the vertical wall 70 is connected to the upper surface of the front end of the upper half 45 by rear ribs 73, 73.
The rear surface ribs 73 are provided in a pair at the left and right side edge portions of the rear surface of the vertical wall portion 70. The trailing edges of the rear surface ribs 73, 73 fall rearward toward the filler port 31 side.

  The front extension portion 71 extends forward and upward. The lower surface of the front extension 71 is connected to the front of the vertical wall 70 by the reinforcing ribs 74 and 74 (ribs). The reinforcing ribs 74, 74 extend downward from the left and right side edges of the front extension 71, and the rear end is connected to the left and right side edges of the front surface of the vertical wall portion 70. The front edges of the reinforcing ribs 74, 74 are inclined rearward as viewed from the side of the vehicle. The lower ends 74 a of the reinforcing ribs 74, 74 are connected to the upper portion of the flange-like upper joint 47. The reinforcing ribs 74, 74 extend from the upper joint portion 47 to the lower surface of the front extension 71.

The mounting hole 72 is a round hole. The mounting hole 72 is provided between the left and right reinforcing ribs 74 in the front extension 71.
A cylindrical collar member 75 having anti-vibration properties is fitted in the mounting hole 72, and the tank fixture 39a is inserted into the hole of the collar member 75 from above. The tank fixture 39a is a bolt.
The tank fixture 39a fastens the front mounting stay 37 to the vehicle body frame F (FIG. 1) via the collar member 75.

As shown in FIG. 10, the vertical wall portion 70 of the front mounting stay 37 extends upward from the upper surface of the upper half 45 spaced upward with respect to the upper joint surface 47c and the lower joint surface 48c. That is, the front mounting stay 37 is integrally provided on the upper half 45 at a position vertically separated from the upper joint surface 47 c and the lower joint surface 48 c.
Thereby, the external force transmitted to the upper half 45 through the front mounting stay 37 is dispersed to the upper surface portion of the upper half 45 without concentrating on the upper joint surface 47 c and the lower joint surface 48 c. Therefore, the influence of external force on the barrier sheet layer 36 in the vicinity of the upper bonding surface 47c and the lower bonding surface 48c can be reduced, and the barrier sheet layer 36 can be effectively protected.

An upper surface groove 71 a extending in the width direction of the fuel tank main body 35 is provided between the mounting hole 72 and the vertical wall portion 70 on the upper surface of the front extension 71.
Further, on the lower surface of the front extension 71, a lower surface groove 71b extending in the front-rear direction is provided between the attachment hole 72 and the front end of the front extension 71.

In the portion where the upper surface groove 71a and the lower surface groove 71b are provided, the plate thickness of the front extension portion 71 becomes smaller, and the strength of the front extension portion 71 becomes smaller. That is, the upper surface groove 71a and the lower surface groove 71b are weak portions that reduce the strength of the front extension portion 71. The strength of the front extension 71 is lowered at the upper surface groove 71 a and the lower surface groove 71 b provided around the mounting hole 72.
When an excessive external force acts on the front mounting stay 37, the front mounting stay 37 is first broken at the periphery of the upper surface groove 71a and the lower surface groove 71b, and a part of the external force is absorbed by the front mounting stay 37. Ru. For this reason, it can suppress that excessive external force is transmitted to the barrier sheet layer 36 via the front attachment stay 37, and the barrier sheet layer 36 can be protected.

FIG. 11 is a perspective view of the rear mounting stay 38L as viewed from the left rear side. 12 is a cross-sectional view taken along line XII-XII of FIG. Since the rear mounting stays 38L and 38R are provided symmetrically in the left-right direction, the rear mounting stay 38L will be described in detail here to simplify the description of the rear mounting stay 38R.
Referring to FIGS. 11 and 12, the rear mounting stay 38 </ b> L is provided at the left edge of the rear of the lower half 46. The rear mounting stay 38R is provided at the right edge of the rear of the lower half 46.
The rear mounting stay 38L includes a side wall 80 extending downward from the side edge of the lower surface of the lower half 46, and a cylindrical portion 81 integrally provided at the lower end of the side wall 80.

The side wall portion 80 is formed in a plate shape facing the vehicle width direction of the motorcycle 1, and in a side view, is formed in an inverted triangle shape which is tapered downward.
The cylindrical portion 81 is formed in a cylindrical shape that protrudes outward in the vehicle width direction from the lower end portion of the side wall portion 80. The cylindrical portion 81 includes a mounting hole 82 that passes through the rear mounting stay 38L in the vehicle width direction.
A pair of reinforcing ribs 83, 83 (ribs) connecting the upper portion of the cylindrical portion 81 and the lower surface of the lower half 46 vertically is provided on the outer surface of the side wall portion 80. The reinforcing ribs 83, 83 are provided in a pair, spaced apart from each other in the front-rear direction.
A portion of the upper end portion 83 a of the reinforcing rib 83, 83 is connected to the lower portion of the flange-like lower joint portion 48. The reinforcing ribs 83, 83 extend from the lower joint portion 48 to the cylindrical portion 81.

Referring to FIGS. 1 and 11, a cylindrical collar member 84 having anti-vibration properties is fitted into the mounting hole 82, and the tank fastener 39b is inserted into the hole of the collar member 84 from the outside in the vehicle width direction. Ru. The tank fixture 39b is a bolt.
The tank fixture 39b fastens the rear mounting stay 38L to the tank stays 15a and 15a via the collar member 84.

As shown in FIG. 12, the side wall portion 80 of the rear mounting stay 38L extends downward from the lower surface of the lower half 46 spaced downward with respect to the upper joint surface 47c and the lower joint surface 48c. That is, the rear mounting stay 38L is integrally provided on the lower half 46 at a position vertically separated from the upper joint surface 47c and the lower joint surface 48c.
Thereby, the external force transmitted to the lower half 46 via the rear mounting stay 38L is dispersed to the lower surface portion of the lower half 46 without being concentrated on the upper joint surface 47c and the lower joint surface 48c. Therefore, the influence of external force on the barrier sheet layer 36 in the vicinity of the upper bonding surface 47c and the lower bonding surface 48c can be reduced, and the barrier sheet layer 36 can be effectively protected.

In the vicinity of the outer periphery of the cylindrical portion 81 at the lower end portions of the reinforcing ribs 83, 83, grooves 83b, 83b which are recessed inward in the vehicle width direction are provided.
In the portions where the grooves 83b, 83b are provided, the plate thickness of the reinforcing ribs 83, 83 becomes smaller, and the strength of the rear mounting stay 38L becomes smaller. That is, the grooves 83b and 83b are weak portions that reduce the strength of the rear mounting stay 38L. The strength of the rear mounting stay 38L decreases at the portions of the grooves 83b and 83b provided around the mounting hole 82.
When an excessive external force acts on the rear attachment stay 38L, the rear attachment stay 38L is first broken at the periphery of the grooves 83b and 83b, and a part of the external force is absorbed by the rear attachment stay 38L. For this reason, it can suppress that excessive external force is transmitted to the barrier sheet layer 36 via the rear attachment stay 38L, and can protect the barrier sheet layer 36.

With reference to FIGS. 1 to 3, the front mounting stay 37 and the rear mounting stays 38 </ b> L and 38 </ b> R are disposed apart from each other in the front-rear direction and the vertical direction.
Specifically, the front mounting stay 37 is provided at the top of the front end of the upper half 45, and the rear mounting stays 38 </ b> L and 38 </ b> R are provided at the bottom rear of the lower half 46. That is, the front mounting stay 37 and the rear mounting stays 38L and 38R are provided separately from each other in the front-rear direction and the vertical direction and divided into the upper half 45 and the lower half 46. Thus, the external force acting on the fuel tank main body from the front mounting stay 37 and the rear mounting stays 38L and 38R can be dispersed in a wide range of the fuel tank main body. Therefore, stress concentration on the barrier sheet layer 36 in the vicinity of the upper bonding surface 47c and the lower bonding surface 48c can be suppressed, and the barrier sheet layer 36 can be effectively protected.

Next, the mounting structure of the base 41 will be described.
13 is a cross-sectional view taken along line XIII-XIII of FIG.
As shown in FIG. 13, the base 41 is engaged with and attached to the cylindrical injection portion 40. Further, the base 41 is fixed to a base fixing portion 91 (fixed portion) provided on the upper surface of the fuel tank main body 35 by a base fixing tool 42. A seal member 92 is interposed between the base 41 and the cylindrical injection portion 40.

The cylindrical injection portion 40 integrally includes a mouthpiece mounting cylindrical portion 93 extending upward from the upper surface of the upper half 45 and a tank inner cylindrical portion 94 extending inside the fuel tank main body 35.
The cylindrical injection portion 40 is integrally formed with the fuel tank main body 35 at the time of injection molding with the mold 53 of FIG. 5.
The mouthpiece mounting cylinder 93 includes a base end 95 extending upward from the upper surface of the upper half 45, and an upper portion 96 (a part covered by the fitting portion) located above the base end 95. Although the proximal end 95 and the upper portion 96 are provided coaxially, the outer diameter of the proximal end 95 is larger than the outer diameter of the upper portion 96.
An annular seal groove 96 a recessed inward in the radial direction is provided on the outer peripheral portion of the upper portion 96 of the mouthpiece mounting cylindrical portion 93.

The inner peripheral surface 93a of the mouthpiece mounting cylinder 93 has the same diameter over the entire length.
The tip end surface 93b of the mouthpiece mounting cylinder 93 is flat. Chamfers are provided on the inner edge and the outer edge of the tip end surface 93b.
A step is formed on the upper and lower intermediate portions of the outer peripheral surface 93 c of the mouthpiece mounting cylindrical portion 93 due to the difference in outer diameters of the base end portion 95 and the upper portion 96.

FIG. 14 is a cross-sectional view for explaining the processing of the die attachment cylindrical portion 93. As shown in FIG.
After the injection molding with the die 53 of FIG. 5 is performed on the die attachment cylindrical portion 93, the finishing portion 90 shown in FIG. 14 is finished with high accuracy by machining. Machining is, for example, milling.
Specifically, the finishing portion 90 is the outer peripheral surface 93 c, the tip end surface 93 b, and the inner peripheral surface 93 a of the upper portion 96 including the seal groove 96 a.

The mouthpiece fixing portion 91 includes an outer projecting portion 97 projecting upward from the upper surface of the upper half 45 and an inner projecting portion 98 (projecting portion) projecting inward of the fuel tank main body 35. The outer projecting portion 97 and the inner projecting portion 98 are formed by projecting the resin constituting the fuel tank main body 35.
Further, the mouthpiece fixing portion 91 includes a nut 99 embedded in the outer protruding portion 97 and the inner protruding portion 98.
Specifically, the base fixing portion 91 includes a hole 100 recessed downward from the flat upper surface of the outer protrusion 97, and the nut 99 is embedded below the hole 100. The threaded portion 99 a of the nut 99 is exposed upward from the hole 100. A chamfered portion 99 b is provided on the outer peripheral portion of the lower end of the nut 99.

Since the mouthpiece fixing portion 91 includes the inward protruding portion 98, the embedded length of the nut 99 can be secured large, and the nut 99 can be firmly coupled to the fuel tank main body 35.
The tip end surface 98a of the inner protrusion 98 is formed in a hemispherical convex shape, and has a smooth curved surface.

FIG. 15 is a view of the periphery of the inner projecting portion 98 of the mouthpiece fixing portion 91 as viewed from the inside of the fuel tank main body 35.
With reference to FIGS. 2, 13 and 15, a plurality of base fixing parts 91 are provided on a concentric circle centering on the cylindrical injection part 40 at substantially equal intervals.
The barrier sheet layer 36 is also provided on the inner protrusion 98. The barrier sheet layer 36 provided on the inner protrusion 98 is a smooth curved surface portion 36c along the tip end surface 98a. For this reason, it is possible to prevent stress concentration on the barrier sheet layer 36 provided in the inner projecting portion 98, and the barrier sheet layer 36 can be firmly adhered to the inner surface of the fuel tank main body 35.
In addition, the barrier sheet layer 36 includes a folded portion 36 d extending toward the inside of the fuel tank main body 35 around the base end of the tank inner cylindrical portion 94. The folded back portion 36 d is formed in an annular shape along the outer peripheral portion of the base end portion of the tank inner cylindrical portion 94, and is coupled to the outer peripheral portion of the tank inner cylindrical portion 94.

The mouthpiece fixing tool 42 includes a mouthpiece fixing bolt 101 (bolt) fastened to a nut 99 of the mouthpiece fixing portion 91, and a collar 102 through which a screw portion of the mouthpiece fixing bolt 101 is inserted.
The collar 102 includes a cylindrical portion 102 a fitted in the hole 100 of the mouthpiece fixing portion 91 and a flange portion 102 b protruding from the cylindrical portion 102 a.

The base 41 includes a tubular skirt 110 covering the outer peripheral surface 93 c of the base mounting cylindrical portion 93, an inner cylindrical portion 111 fitted with the inner peripheral surface 93 a of the base mounting cylindrical portion 93, and an upper edge of the skirt 110. An end surface 112 connecting the upper edge of the inner cylindrical portion 111 and a plate-like stay 113 extending radially outward from the lower end of the skirt 110 are provided.
The skirt portion 110, the end surface portion 112, and the inner cylindrical portion 111 are integrally provided by bending a metal plate. The stay portion 113 is joined to the skirt portion 110.
The base 41 is made of metal and has higher strength than the cylindrical injection portion 40. For this reason, the cylindrical injection part 40 can be protected from the fueling nozzle inserted in the fueling port 31 at the time of the fueling in a fueling place etc.

At the inner peripheral portion of the inner cylindrical portion 111, a female screw portion 111a is provided, with which the screw portion of the outer periphery of the tank cap 32 (FIG. 1) is screwed. The inner cylindrical portion 111 is provided over substantially the entire length of the inner peripheral surface 93 a of the mouthpiece mounting cylindrical portion 93.
The end surface portion 112 extends radially outward from the upper edge of the inner cylindrical portion 111. The end surface portion 112 is formed in an annular shape coaxial with the cylindrical injection portion 40 in the axial direction of the mouthpiece 41.
The end surface portion 112 covers the tip end surface 93 b of the mouthpiece mounting cylindrical portion 93 from above. A space is provided between the end surface portion 112 and the tip end surface 93 b.

The skirt portion 110 is bent downward from the outer peripheral portion of the tip end surface 93 b and extends downward in parallel with the inner cylindrical portion 111.
The skirt portion 110 includes a fitting portion 115 fitted to the portion of the upper portion 96 in the outer circumferential surface 93 c, and a large diameter portion 116 covering the portion of the proximal end 95 in the outer circumferential surface 93 c.
The inner circumferential surface of the fitting portion 115 is in close contact with the outer circumferential surface 93 c of the upper portion 96. A seal member 92 is provided in the seal groove 96 a of the upper portion 96. The seal member 92 is compressed and deformed between the seal groove 96 a and the fitting portion 115 to seal between the upper portion 96 and the skirt portion 110.

The large diameter portion 116 of the skirt portion 110 extends downward from the fitting portion 115 to the vicinity of the upper surface of the upper half 45. The large diameter portion 116 is formed to have an inner diameter and an outer diameter larger than that of the fitting portion 115.
The large diameter portion 116 is provided larger in diameter than the fitting portion 115 so as to be separated from the outer peripheral surface 93 c of the mouthpiece mounting cylindrical portion 93.
Specifically, the large diameter portion 116 includes a parallel portion 117 parallel to the fitting portion 115 and an enlarged diameter portion 118 whose diameter gradually increases from the fitting portion 115 to the parallel portion 117.
The parallel portion 117 is provided in parallel with the proximal end 95 of the mouthpiece mounting cylinder 93 and covers the proximal end 95 from the outside. A gap S1 is formed between the parallel portion 117 and the proximal end 95 in the radial direction.

With reference to FIGS. 2 and 13, the stay portion 113 of the mouthpiece 41 has a plurality of attachment portions 119 extending radially outward from the outer peripheral portion of the large diameter portion 116 toward the respective mouthpiece fixing portions 91, and the adjacent attachment portions And a connecting portion 120 for connecting the portions 119 and 119 in the circumferential direction.
The mounting portion 119 is provided with a fixing hole 121 through which the mouthpiece fixing tool 42 is inserted. Specifically, the collar 102 of the mouthpiece fixture 42 is inserted into the fixing hole 121.
The fixing hole 121 is formed to have a diameter larger than the outer diameter of the collar 102 so that the mouthpiece 41 can move by a predetermined distance with respect to the mouthpiece fixture 42. An adjustment gap S2 is formed between the inner periphery of the fixing hole 121 and the outer periphery of the collar 102.
In addition, the stay portion 113 is provided with a peripheral rib 122 (rib) rising from the peripheral edge thereof. The peripheral rib 122 is provided on the entire circumference of the stay portion 113 along the attachment portion 119 and the connection portion 120.

Here, an example of an assembly procedure of the mouthpiece 41 to the fuel tank main body 35 will be described.
As shown in FIG. 13, the base 41 is inserted in the axial direction of the base mounting cylindrical portion 93 so as to sandwich the base mounting cylindrical portion 93 between the skirt portion 110 and the inner cylindrical portion 111, and the base mounting cylinder It is attached to the part 93.
The base 41 is positioned in the axial direction of the base mounting cylindrical portion 93 by the attachment portions 119 of the stay portion 113 being in contact with the upper surface of each base fixing portion 91.

The collar 102 is inserted from above into the fixing hole 121 of the stay portion 113, and is set in the hole portion 100 of the mouthpiece fixing portion 91. The lower end of the collar 102 abuts on the upper surface of the nut 99.
When the mouthpiece fixing bolt 101 is fastened to the nut 99, the peripheral edge portion of the fixation hole 121 of the stay portion 113 is sandwiched between the flange portion 102 b of the collar 102 and the upper surface of the mouthpiece fixing portion 91. Thus, the cap 41 is fastened to the cap fixing portion 91 of the fuel tank main body 35 by the cap fixing bolt 101.

  In the first embodiment, the cap 41 is fastened to the fuel tank main body 35 by the cap fixing bolt 101 in a state of being inserted into the cap mounting cylinder 93. Therefore, when removing the base 41 at the time of maintenance or the like, the base 41 can be easily removed from the base attachment cylindrical portion 93 by removing the base fixing bolt 101 and pulling out the base 41. Further, since the base 41 is not crimped to the base attachment cylindrical portion 93, it can be attached to the base attachment cylindrical portion 93 by reuse of the removed base 41.

FIG. 16 is a cross-sectional view showing the mounting state of the base 41 when there is a dimensional error.
A manufacturing dimensional tolerance is set in the mouthpiece mounting cylinder 93. In FIG. 16, the outer diameter of the upper portion 96 of the mouthpiece mounting cylinder 93 is the minimum value of the dimensional tolerance, and the inside diameter of the mouthpiece mounting cylinder 93 is the maximum value of the dimensional tolerance.
As shown in FIG. 16, when the actual dimension of the mouthpiece mounting cylinder 93 is shifted with respect to the central value of the tolerance, the axis 41 a of the mouthpiece 41 is with respect to the axis C passing the center of the mouthpiece mounting cylinder 93. It can assemble | attach in the state shifted to the radial direction of the nozzle | cap | die attachment cylinder part 93. As shown in FIG.

In the present embodiment, the adjustment gap S2 (FIG. 13) is provided between the inner periphery of the fixing hole 121 of the base 41 and the outer periphery of the collar 102 of the base fixture 42, and the large diameter portion 116 and the base A gap S1 (FIG. 13) is provided between the end 95 in the radial direction. Here, the size is approximately the same as the adjustment gap S2 and the gap S1.
Thus, the mouthpiece 41 can be moved in the radial direction of the mouthpiece mounting cylinder 93 by an amount corresponding to the adjustment gap S2 and the space S1, and can be fixed by the mouthpiece fixing bolt 101 in that state. For this reason, the nozzle 41 can be attached to the mouthpiece mounting cylinder 93 while allowing dimensional tolerance in manufacturing of the mouthpiece mounting cylinder 93.
Here, the gap S1 is set so that the gap S1 does not become 0 even when the base 41 is moved by the adjustment gap S2. That is, a gap S1 is always formed between the large diameter portion 116 and the cylindrical injection portion 40.

As described above, according to the first embodiment to which the present invention is applied, the resin fuel tank 30 is provided with the resin fuel tank main body provided by joining the upper half 45 and the lower half 46. 35 and a barrier sheet layer 36 provided on the inner surface of the fuel tank main body 35 to reduce the permeation of fuel from the fuel tank main body 35, the edge of the barrier sheet layer 36 has an upper half 45 and a lower half The edge of the barrier sheet layer 36 is provided in the vicinity of the upper joint surface 47 c and the lower joint surface 48 c where the two 46 are joined together and the end of the barrier sheet layer 36 bends 61, 62 bent toward the outside of the fuel tank body 35. The bent portions 61 and 62 are embedded in the fuel tank main body 35 at positions separated from the upper joint surface 47 c and the lower joint surface 48 c.
According to this configuration, since the bent portions 61 and 62 bent toward the outside of the fuel tank main body 35 are embedded in the fuel tank main body 35, the edge of the barrier sheet layer 36 is firmly coupled to the fuel tank main body 35 , It is hard to receive the influence at the time of joining of upper side joint side 47c and lower side joint side 48c. Furthermore, the bent portions 61 and 62 are at positions separated from the upper joint surface 47c and the lower joint surface 48c, and are not joined at the upper joint surface 47c and the lower joint surface 48c. As a result, there is no need to manage the bonding of the barrier sheet layer 36 when bonding the upper bonding surface 47c and the lower bonding surface 48c, so the resin fuel tank 30 can be easily manufactured.

The bent portions 61 and 62 of the barrier sheet layer 36 extend outside the fuel tank main body 35 in parallel with the upper bonding surface 47 c and the lower bonding surface 48 c, respectively. According to this configuration, the surfaces of the bent portions 61 and 62 are perpendicular to the bonding direction of the upper bonding surface 47c and the lower bonding surface 48c, and thus occur when the upper half 45 and the lower half 46 are bonded. You can receive the power efficiently.
Further, the width W1 of the upper bonding portion 47 including the upper bonding surface 47c at the end surface is larger than the thickness t1 of the side wall 45a of the fuel tank main body 35, and the lower bonding portion 48 including the lower bonding surface 48c at the end surface. The width W2 is larger than the thickness t2 of the side wall 46a of the fuel tank body 35. According to this configuration, a large area can be secured for the upper bonding surface 47c and the lower bonding surface 48c, so that the bonding strength between the upper bonding surface 47c and the lower bonding surface 48c can be increased.

Furthermore, the upper joint 47 and the lower joint 48 are formed in a flange shape projecting to the outside of the fuel tank main body 35, and the upper joint 47 and the lower joint 48 are the upper joint 47 and the lower joint. The pressing surfaces 47 d and 48 d are pressed when the pressure 48 is pressed, and the pressing surfaces 47 d and 48 d overlap the upper bonding surface 47 c and the lower bonding surface 48 c in the pressing direction P. According to this configuration, in the portions where the pressing surfaces 47d and 48d overlap the upper bonding surface 47c and the lower bonding surface 48c in the pressing direction P, the pressing force of the pressing surfaces 47d and 48d is the upper bonding surface 47c and the lower bonding surface. It can be transmitted directly to 48c. For this reason, it can join firmly.
Further, the barrier sheet layer 36 includes an upper barrier sheet layer 36a provided on the upper half 45 which is one divided body, and a lower barrier sheet layer 36b provided on the lower half 46 which is the other divided body. The bent portion 61 of the upper barrier sheet layer 36 a and the bent portion 62 of the lower barrier sheet layer 36 b are embedded in the fuel tank main body 35 in a state of being separated from each other. According to this configuration, the bending portion 61 and the bending portion 62 are not bonded to each other at the upper bonding surface 47 c and the lower bonding surface 48 c. For this reason, since it is not necessary to control joining of the barrier sheet layer 36 in joining the upper joint surface 47c and the lower joint surface 48c, the fuel tank 30 can be easily manufactured.

Further, the barrier sheet layer 36 is one in which outer layers 57a and 57b, which are layers of high density polyethylene, are adhered to both surfaces of the barrier layer 55, which is a layer of ethylene vinyl alcohol copolymer, via adhesive layers 56 and 56, respectively. The barrier sheet layer 36 is bonded to the inner surface of the high density polyethylene fuel tank body 35 through the outer layer 57a. According to this configuration, in the barrier sheet layer 36, the outer layer 57a, which is a layer of high density polyethylene, is bonded to the inner surface of a high density polyethylene fuel tank main body 35 made of the same material as the outer layer 57a. Therefore, the barrier sheet layer 36 can be firmly bonded to the inner surface of the fuel tank body 35.
In addition, cut surfaces 61a and 62a trimmed in the thickness direction by a cutting edge are formed at the tips of the bent portions 61 and 62. Therefore, the dimensional accuracy of the bent portions 61 and 62 can be improved, and the bent portions 61 and 62 can be appropriately embedded in the fuel tank main body 35.

The upper bonding surface 47c and the lower bonding surface 48c are the flat portions 47a and 48a perpendicular to the pressure bonding direction (pressing direction P) of the upper bonding surface 47c and the lower bonding surface 48c, and the flat portions 47a and 48a. The upper joint portion 47 and the lower joint portion 48 provided with inclined upper surface 47c and lower joint surface 48c at their end faces are formed into a flange shape projecting to the outside of the fuel tank main body 35. The upper joint portion 47 and the lower joint portion 48 have pressing surfaces 47d and 48d which are pressed when the upper joint surface 47c and the lower joint surface 48c are pressure-bonded, and the upper joint portion in the slope portions 47b and 48b The width W3 of the lower bonding portion 47 is smaller than the widths W1 and W2 of the upper bonding portion 47 and the lower bonding portion 48 in the flat portions 47a and 48a.
According to this configuration, the slopes 47b and 48b receive a smaller crimping force than the flats 47a and 48a perpendicular to the crimping direction (pressing direction P) during crimping, but the width of the slopes 47b and 48b Since W3 is smaller than the widths W1 and W2 of the flat portions 47a and 48a, the surface pressure of the slope portions 47b and 48b is sufficiently large. Therefore, the entire upper joint surface 47c and the lower joint surface 48c can be well joined.

Further, according to the first embodiment to which the present invention is applied, the resin fuel tank 30 includes the resin fuel tank main body 35 provided by joining the upper half 45 and the lower half 46; A barrier sheet layer 36 provided on the inner surface of the fuel tank main body 35 to reduce the permeation of fuel from the fuel tank main body 35, and a front mounting stay 37 and rear mounting stays 38L, 38R for mounting the fuel tank main body 35 to a vehicle body Prepare. The front mounting stay 37 and the rear mounting stays 38L and 38R are vertically separated from the upper joint surface 47c and the lower joint surface 48c where the upper half 45 and the lower half 46 are joined together and joined. The fuel tank main body 35 is provided.
According to this configuration, the front mounting stay 37 and the rear mounting stays 38L and 38R are vertically separated from the upper joint surface 47c and the lower joint surface 48c of the upper half 45 and the lower half 46, respectively. Being provided in the fuel tank main body 35, it is possible to suppress the influence of external forces from the front mounting stay 37 and the rear mounting stays 38L, 38R on the barrier sheet layer 36 in the vicinity of the upper joint surface 47c and the lower joint surface 48c. Therefore, the barrier sheet layer 36 can be effectively protected against external force.

The front mounting stay 37 and the rear mounting stays 38L and 38R are separated from each other in the vertical direction and the front-rear direction. According to this configuration, the external force acting on the fuel tank main body 35 from the plurality of front mounting stays 37 and the rear mounting stays 38L and 38R can be dispersed in a wide range of the fuel tank main body 35. Therefore, the barrier sheet layer 36 can be effectively protected against external force.
The front mounting stay 37 and the rear mounting stays 38L and 38R are separately provided in the upper half 45 and the lower half 46. According to this configuration, the external force acting on the fuel tank body 35 from the front mounting stay 37 and the rear mounting stays 38L and 38R is dispersed to the upper half 45 and the lower half 46. Therefore, the barrier sheet layer 36 can be effectively protected against external force.

Further, the mounting stay includes a front mounting stay 37 provided at the front of the fuel tank main body 35 and rear mounting stays 38L and 38R provided at the rear of the fuel tank main body 35. The rear mounting stays 38 </ b> L and 38 </ b> R are provided at left and right center portions of the half 45, and a pair of rear mounting stays 38 </ b> L and 38 </ b> R are provided on the left and right of the lower half 46. According to this configuration, the external force is dispersed in the front-rear direction from the front mounting stay 37 at the front of the fuel tank main body 35 and the rear mounting stays 38L and 38R at the rear of the fuel tank main body 35 It disperses in the lower half 46 and acts on the upper joint surface 47c and the lower joint surface 48c. Therefore, the barrier sheet layer 36 can be effectively protected. Further, since the front mounting stay 37 and the left and right rear mounting stays 38L and 38R are supported at three points, the fuel tank main body 35 can be effectively and firmly mounted with the minimum configuration.
Further, the front mounting stay 37 has a mounting hole 72 through which the tank fixing tool 39a fixed to the vehicle body frame F is inserted. The front mounting stay 37 has an upper surface groove 71a as a fragile portion in the vicinity of the mounting hole 72. And a lower surface groove 71b. Further, the rear mounting stays 38L, 38R are provided with mounting holes 82 through which the tank fasteners 39b fixed to the vehicle body frame F are inserted, and the rear mounting stays 38L, 38R are grooves as fragile portions in the vicinity of the mounting holes 82. 83b and 83b are provided. According to this configuration, when an excessive external force is applied, the upper mounting grooves 37a of the front mounting stay 37 and the left and right rear mounting stays 38L, 38R located away from the upper joint surface 47c and the lower joint surface 48c. The lower groove 71b and the grooves 83b and 83b are broken earlier than the upper joint surface 47c and the lower joint surface 48c. Therefore, the barrier sheet layer 36 in the fuel tank body 35 can be protected.

The fragile portion is an upper surface groove 71a, a lower surface groove 71b, and grooves 83b, 83b provided around the attachment holes 72, 82. According to this configuration, the fragile portion can be compactly provided at a position far from the upper joint surface 47c and the lower joint surface 48c, and the upper joint surfaces 47c and the upper joint surfaces 47c and 38R from the left and right rear mounting stays 38L, 38R. Since the external force acting on the lower bonding surface 48c is reduced, the barrier sheet layer 36 can be protected.
Further, the upper joint surface 47 c is provided at the upper joint portion 47 which is a flange portion extending outward of the fuel tank main body 35, and the front mounting stay 37 includes a reinforcing rib 74 extending from the upper joint portion 47. According to this configuration, the strength and rigidity of the front mounting stay 37 can be increased by the upper joint portion 47 and the reinforcing rib 74. Therefore, the fuel tank main body 35 can be firmly supported by the front mounting stay 37.
The lower joint surface 48 c is provided at the lower joint portion 48 which is a flange portion extending outward of the fuel tank main body 35, and the rear attachment stays 38 L and 38 R are reinforcing ribs extending from the lower joint portion 48. 83 and 83 are provided. According to this configuration, the strength and rigidity of the rear mounting stays 38L and 38R can be increased by the lower joint portion 48 and the reinforcing ribs 83 and 83. Therefore, the fuel tank main body 35 can be firmly supported by the rear mounting stays 38L and 38R.

Furthermore, according to the first embodiment to which the present invention is applied, the fuel tank 30 made of resin has a fuel tank main body 35 made of resin and a cylindrical cylinder made of resin for injecting liquid provided in the fuel tank main body 35. The fuel tank main body 35 is provided with the injection portion 40 and the mouth ring 41 engaged with the cylindrical injection portion 40 and covering the inner peripheral surface 93 a, the tip end surface 93 b and the outer peripheral surface 93 c of the cylindrical injection portion 40. And a mouthpiece fixing portion 91 to which the mouthpiece fixing tool 42 for fixing the fuel tank body 35 is fixed. The base 41 includes an annular skirt portion 110 covering the outer circumferential surface 93 c, and the skirt portion 110 includes a fitting portion 115 fitted on the upper portion 96 of the outer circumferential surface 93 c at its upper portion and is larger than the fitting portion 115 The base 41 has a large diameter portion 116 at the lower portion thereof, the base 41 includes a stay portion 113 extending radially outward from the large diameter portion 116, and the fixing hole 121 through which the base fixing tool 42 is inserted is a stay. Provided in the unit 113;
According to this configuration, the mouthpiece 41 engaged with the cylindrical injection portion 40 is the mouthpiece of the fuel tank main body 35 by the mouthpiece fixing tool 42 inserted into the fixing hole 121 of the stay portion 113 extending from the large diameter portion 116 As it is fixed to the fixing portion 91, the mounting and demounting of the mouthpiece fixing tool 42 makes it easy to mount and dismount the cylindrical injection portion 40. Further, the base 41 has a large diameter portion 116 having a diameter larger than that of the fitting portion 115, and the gap S1 between the large diameter portion 116 and the outer peripheral surface 93c of the cylindrical injection portion 40 It can move together. Thereby, even if there is a dimensional error in manufacturing the cylindrical injection portion 40, the error can be absorbed by the movement of the die 41. For this reason, the nozzle 41 can be attached and detached while allowing dimensional error in manufacturing of the cylindrical injection portion 40.

The fixing hole 121 is larger in diameter than the mouthpiece fixture 42 so that the mouthpiece 41 can be moved relative to the cylindrical injection portion 40 in the radial direction of the cylindrical injection portion 40 by a predetermined distance. According to this configuration, the mouthpiece 41 can move the movable portion of the fixing hole 121 with respect to the mouthpiece fixture 42 in the radial direction of the cylindrical injection portion 40. For this reason, the nozzle 41 can be attached and detached while allowing dimensional error in manufacturing of the cylindrical injection portion 40.
Further, a barrier sheet layer 36 is provided on the inner surface of the fuel tank main body 35 to reduce the permeation of the fuel stored in the fuel tank main body 35, and the base fixing portion 91 is a nut embedded in the surface of the fuel tank main body 35. 99, the mouthpiece fixing tool 42 is the mouthpiece fixing bolt 101 screwed to the nut 99, and the nut 99 is embedded in the inward projecting portion 98 projecting to the inside of the fuel tank main body 35, and the tip of the inward projecting portion 98 The surface 98a is hemispherical convex. According to this configuration, since the tip end surface 98a of the inner protrusion 98 has a hemispherical convex shape, stress concentration on the barrier sheet layer 36 provided on the tip end surface 98a of the inner protrusion 98 can be prevented. The degree of freedom of the arrangement of the part 91 can be improved.

Furthermore, a plurality of base fixing parts 91 are provided at substantially equal intervals on concentric circles centering on the cylindrical injection part 40. According to this configuration, since the external force acting on the mouthpiece fixing portion 91 is effectively dispersed, stress concentration around the cylindrical injection portion 40 can be reduced.
Further, the base 41 includes a peripheral rib 122 which rises from the peripheral edge of the stay portion 113, and the peripheral rib 122 is continuous across the plurality of fixing holes 121 provided around the skirt portion 110. As a result, the strength and rigidity of the base 41 can be improved, and the cylindrical injection portion 40 can be effectively protected by the base 41.

The large diameter portion 116 also includes a parallel portion 117 parallel to the fitting portion 115 and an enlarged diameter portion 116 whose diameter gradually increases from the fitting portion 115 to the parallel portion 117. According to this configuration, the gap S1 between the parallel portion 117 and the outer peripheral surface 93c of the cylindrical injection portion 40 can be easily managed. Further, the rigidity of the skirt portion 110 can be improved by the enlarged diameter portion 116, and the cylindrical injection portion can be effectively protected by the mouth ring 41.
Moreover, the cylindrical injection | pouring part 40 equips the part (upper part 96) which the fitting part 115 of the nozzle | cap | die 41 fits, and the finishing process part 90 finished by machining. According to this configuration, the portion of the cylindrical injection portion 40 to which the fitting portion 115 of the mouthpiece 41 is fitted can be machined with high accuracy. The dimensional error caused by the machining can be absorbed by the movement of the die 41.

Further, the cylindrical injection portion 40 has a proximal end 95 covered by the large diameter portion 116 of the mouth ring 41, and the outer diameter of the proximal end 95 is a portion covered by the fitting portion 115 in the cylindrical injection portion 40 The diameter is larger than the outer diameter of (upper part 96). According to this configuration, the proximal end 95 of the cylindrical injection portion 40 can be enlarged to correspond to the large diameter portion 116 of the mouthpiece 41, and the strength and rigidity of the cylindrical injection portion 40 can be improved.
In addition, a seal member 92 is interposed between the fitting portion 115 of the base 41 and the outer peripheral surface 93 c of the cylindrical injection portion 40. According to this configuration, when the dimensional error is absorbed by the movement of the base 41, the sealability between the fitting portion 115 and the outer peripheral surface 93c of the cylindrical injection portion 40 can be secured by the bending of the seal member 92.

Second Embodiment
The second embodiment to which the present invention is applied will be described below with reference to FIGS. 17 and 18. In the second embodiment, parts that are the same as in the first embodiment are given the same reference numerals, and descriptions thereof will be omitted.
In the second embodiment, the structure of the mounting stay is modified from the first embodiment in accordance with the vehicle body frame F2.

FIG. 17 is a perspective view of the mounting structure of the fuel tank 230 in the second embodiment as viewed from the upper left side. FIG. 18 is a schematic view of the mounting structure of the fuel tank 230 as viewed from the front side.
The motorcycle 201 includes a vehicle body frame F2 and a fuel tank 230. The other parts of the motorcycle 201 are not shown in FIG. 17, but the motorcycle 201 is configured in the same manner as the motorcycle 1.
The vehicle body frame F 2 includes a head pipe portion 14, a main frame 215 extending rearward and downward from the head pipe portion 14, a down frame 16, and a seat frame 217 extending rearward from the main frame 215.
The main frame 215 is provided with tank support parts 215a, 215a that project to the left and right on the side.

The fuel tank 230 includes a fuel tank body 235 and a barrier sheet layer 36 (see FIG. 3).
The fuel tank main body 235 is disposed to straddle the main frame 215 from the upper side to the left side, and is supported by the main frame 215.
The fuel tank body 235 includes an upper portion 235a disposed above the main frame 215, and a pair of left and right side portions 235b and 235b extending downward from the upper portion 235a through the left and right sides of the main frame 215.

The fuel tank main body 235 is formed in a tank shape by joining the upper half 245 and the lower half 246 at joint surfaces 247c and 248c.
In the upper half body 245, front attachment stays 237 and 237 (attachment stays) are provided on the inner side surfaces of the side portions 235b and 235b in which the tank support portions 215a and 215a are fitted. The front portion of the fuel tank body 235 is attached to the tank supports 215a, 215a.
The front mounting stays 237, 237 are spaced upward from the joint surfaces 247c, 248c.
For this reason, it can suppress that the external force from the front attachment stay 237,237 influences the barrier sheet layer 36 of joint surface 247c, 248c vicinity. Therefore, the barrier sheet layer 36 can be effectively protected against external force.

  The upper half 245 includes a rear mounting stay 238 extending rearward from the rear end. The rear portion of the fuel tank body 235 is fixed to the vehicle body frame F2 by a tank fixing member 239 which is inserted into the rear mounting stay 238 from above.

The above embodiment shows one aspect to which the present invention is applied, and the present invention is not limited to the above embodiment.
In the above embodiment, the upper half 45 and the lower half 46 are described as an example of the divided body constituting the fuel tank main body 35, but the present invention is not limited to this, and the fuel tank The main body 35 may be divided into three or more halves. For example, the lower half 46 may be joined to the upper half composed of two divided bodies to form a fuel tank body.
In the above embodiment, the motorcycle 1 has been described as an example of the saddle-ride type vehicle, but the present invention is not limited to this, and the resin fuel tank of the present invention has two front wheels or two rear wheels. The present invention is applicable to all straddle-type vehicles such as three-legged straddle-type vehicles and straddle-type vehicles equipped with four or more wheels. The present invention may be applied to resin fuel tanks other than vehicles.

30,230 Fuel tank (plastic fuel tank)
35, 235 Fuel tank main body 36 Barrier sheet layer 37, 237 Front mounting stay (mounting stay)
38L, 38R Rear mounting stay (mounting stay)
39a, 39b Tank fixing device (fixing device)
45,245 upper half 46,246 lower half 47 upper joint (flange)
47c Upper joint surface (joint surface)
48 Lower joint (flange)
48c Lower joint surface (joint surface)
71a Upper surface groove (fragile part, groove)
71b Bottom groove (fragile part, groove)
72, 82 mounting hole 74, 74 reinforcing rib (rib)
83, 83 Reinforcement rib (rib)
83b, 83b groove (fragile part)

Claims (7)

A resin-made fuel tank main body (35, 235) provided by joining an upper half (45, 245) and a lower half (46, 246) and an inner surface of the fuel tank (35, 235) A barrier sheet layer (36) for reducing the permeation of fuel from the fuel tank body (35, 235), and a mounting stay (37, 38L, 38R, 237) for attaching the fuel tank body (35, 235) to a vehicle body. In the resin fuel tank provided with
The attachment stays (37, 38L, 38R, 237) are joint surfaces (47c, 48c, 247c, 248c) where the upper half (45, 245) and the lower half (46, 246) are joined together. And a resin fuel tank provided in the fuel tank body (35, 235) at a position spaced apart in the vertical direction. A plurality of the mounting stays (37, 38L, 38R) are provided,
The resin fuel tank according to claim 1, wherein the plurality of mounting stays (37, 38L, 38R) are separated from each other in the vertical direction and the front-rear direction.   The resin fuel tank according to claim 1 or 2, wherein the mounting stays (37, 38L, 38R) are respectively provided on the upper half (45) and the lower half (46). The mounting stays (37, 38L, 38R) are a front mounting stay (37) provided at the front of the fuel tank body (35), and a rear mounting stay (36) provided at the rear of the fuel tank body (35). 38L and 38R),
The front mounting stay (37) is provided at the left and right central portions of the upper half (45),
The resin fuel tank according to any one of claims 1 to 3, wherein the rear mounting stays (38L, 38R) are provided in a pair on the left and right of the lower half (46). The mounting stay (37, 38L, 38R) includes a mounting hole (72, 82) through which a fixing tool (39a, 39b) fixed to the vehicle body is inserted.
5. The mounting stay (37, 38L, 38R) according to any one of claims 1 to 4, characterized in that a fragile portion (71a, 71b, 83b) is provided in the vicinity of the mounting hole (72, 82). Resin fuel tank.   The resin fuel tank according to claim 5, wherein the fragile portion (71a, 71b, 83b) is a groove provided around the attachment hole (72, 82). The joint surfaces (47c, 48c) are provided on flange portions (47, 48) extending outward of the fuel tank body (35),
The resin fuel tank according to any one of claims 1 to 6, wherein the mounting stay (37, 38L, 38R) comprises a rib (74, 83) extending from the flange portion (47, 48). .

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