JP2023047168A - fuel tank structure - Google Patents

Abstract

To attach a cap which closes an oil filler port in an openable and closable manner through swinging with high accuracy and reduce the number of components.SOLUTION: A fuel tank structure includes: an oil filler port (63) provided on an upper surface (29a) of a fuel tank (29); and a cap (50) which closes the oil filler port (63) in an openable and closable manner through swinging. An expansion part (60) expanding upward is provided on the upper surface (29a) of the fuel tank (29). The expansion part (60) includes: an upper wall part (61); and a peripheral wall part (62) extending downward from a peripheral edge of the upper wall part (61). The expansion part (60)is joined to the fuel tank (29) at the peripheral wall part (62). The oil filler port (63) is provided at the upper wall part (61). A cap fixing part (70) to which the cap (50) is fixed is provided at the upper wall part (61).SELECTED DRAWING: Figure 6

Description

The present invention relates to a fuel tank structure.

2. Description of the Related Art Conventionally, there is known a fuel tank structure that includes a filler opening that extends upward from the upper surface of a fuel tank and a cap that closes the filler opening (see, for example, Patent Document 1).
Further, there is known a fuel tank structure including a filler opening provided on the upper surface of the fuel tank and a cap that opens and closes the filler opening by swinging (see, for example, Patent Document 2).

JP 2019-137284 A JP-A-5-305888

By the way, when using a cap that can open and close the fuel filler port by swinging, a stay may be attached to the upper surface of the fuel tank according to the height of the fuel filler port, and the cap may be fixed to the stay. In this case, the stay needs to be provided with high accuracy in order to reliably close the fuel filler port with the cap, which increases the difficulty of manufacturing. Also, the number of parts increases by the number of stays.
SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above, and an object of the present invention is to attach a cap that closes a fuel filler port so that it can be opened and closed by swinging with high accuracy, and to reduce the number of parts.

The fuel tank structure is a fuel tank structure including a fuel filler port provided on the upper surface of the fuel tank and a cap that closes the fuel filler port by swinging so as to be openable and closable, and the upper surface of the fuel tank bulges upward. A bulge portion is provided, and the bulge portion includes an upper wall portion and a peripheral wall portion that extends downward from the peripheral edge of the upper wall portion, and the bulge portion is configured such that the peripheral wall portion extends from the fuel tank. The fuel filler port is provided on the upper wall portion, and the cap fixing portion to which the cap is fixed is provided on the upper wall portion.

In the fuel tank structure, it is possible to attach the cap that closes the filler opening so as to be openable and closable by swinging with high precision, and to reduce the number of parts.

1 is a side view of a straddle-type vehicle according to an embodiment of the present invention; FIG. Fig. 2 is a left side view of the front portion of the saddle-ride type vehicle with the vehicle body cover and the like removed to expose the fuel tank; FIG. 4 is a plan view of the upper portion of the fuel tank as seen from above with the cap removed; Fig. 3 is a perspective view of the upper portion of the fuel tank as seen from the side with the cap removed; Fig. 3 is a perspective view of the upper portion of the fuel tank as seen from the side with the cap and tray member removed; FIG. 4 is an exploded perspective view showing parts related to the filler port in the fuel tank structure; It is the perspective view which looked at the swelling part from the downward side. FIG. 4 is a cross-sectional view taken along line VIII-VIII of FIG. 3;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description, 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. In each figure, FR indicates the front of the vehicle body, UP indicates the upper side of the vehicle body, and LH indicates the left side of the vehicle body.

[Embodiment]
FIG. 1 is a side view of a straddle-type vehicle 10 according to an embodiment of the invention.
A straddle-type vehicle 10 includes a body frame 11, a power unit 12 supported by the body frame 11, a front fork 14 supporting a front wheel 13 in a steerable manner, a swing arm 16 supporting a rear wheel 15, and a passenger seat. The vehicle includes a seat 17 .
The saddle-ride type vehicle 10 is a vehicle in which an occupant sits astride a seat 17 . The seat 17 is provided above the rear portion of the body frame 11 .

The body frame 11 includes a head pipe 18 provided at the front end of the body frame 11 , a front frame 19 positioned behind the head pipe 18 , and a rear frame 20 positioned behind the front frame 19 . A front end portion of the front frame 19 is connected to the head pipe 18 .
Seat 17 is supported by rear frame 20 .

The front fork 14 is supported by a head pipe 18 so as to be steerable left and right. The front wheel 13 is supported by an axle 13 a provided at the lower end of the front fork 14 . A steering handle 21 gripped by a passenger is attached to the upper end of the front fork 14 .

The swing arm 16 is supported by a pivot shaft 22 supported by the vehicle body frame 11 . The pivot shaft 22 is a shaft extending horizontally in the vehicle width direction. A pivot shaft 22 is inserted through the front end of the swing arm 16 . The swing arm 16 swings up and down around the pivot shaft 22 .
The rear wheel 15 is supported by an axle 15 a provided at the rear end of the swing arm 16 .

Power unit 12 is arranged between front wheel 13 and rear wheel 15 and supported by body frame 11 .
Power unit 12 is an internal combustion engine. The power unit 12 includes a crankcase 23 and a cylinder portion 24 that houses reciprocating pistons. An exhaust device 25 is connected to the exhaust port of the cylinder portion 24 .
The output of power unit 12 is transmitted to rear wheels 15 by a driving force transmission member that connects power unit 12 and rear wheels 15 .

The straddle-type vehicle 10 also includes a front fender 26 that covers the front wheels 13 from above, a rear fender 27 that covers the rear wheels 15 from above, a step 28 on which the passenger puts his or her feet, and a fuel for storing the fuel used by the power unit 12. and a tank 29 .
A front fender 26 is attached to the front fork 14 . The rear fender 27 and step 28 are provided below the seat 17 . The fuel tank 29 is supported by the vehicle body frame 11 .

The straddle-type vehicle 10 is a motorcycle. The front frame 19 includes a pair of left and right main frames 31 extending backward from the head pipe 18 , a pair of left and right pivot frames 32 extending downward from the rear end of the main frame 31 , and a down frame extending downward from the head pipe 18 . A frame 33 and a pair of left and right lower frames 34 extending rearward from the lower end of the down frame 33 and connected to the lower end of the pivot frame 32 are provided.
The rear frame 20 includes a pair of left and right seat frames 35 extending rearward from the rear portion of the main frame 31 and a pair of left and right sub-frames 36 extending rearward and upward from the pivot frame 32 and connected to the seat frames 35 .

The power unit 12 is arranged between the main frame 31 and the lower frame 34 and between the down frame 33 and the pivot frame 32 and supported by the front frame 19 .
The fuel tank 29 is arranged between the head pipe 18 and the seat 17 above the main frame 31 . Fuel tank 29 is supported by main frame 31 .
A headlight 37 that illuminates the front is arranged in front of the head pipe 18 .

The saddle-ride type vehicle 10 includes a vehicle body cover 30 that covers a vehicle body composed of a vehicle body frame 11 and the like. The vehicle body cover 30 includes a pair of left and right front covers 41 that cover the left and right sides of the headlight 37 from the front, a pair of left and right side covers 42 that cover the front portion of the vehicle body from the outside in the vehicle width direction behind the front cover 41, A tank cover 43 that covers the vehicle body from the outside and above in the vehicle width direction behind the side cover 42, and a pair of left and right covers 44 that cover the vehicle body from the outside in the vehicle width direction behind the side cover 42 and below the tank cover 43. prepared for the front of the

FIG. 2 is a left side view of the front portion of the saddle-ride type vehicle 10 with the vehicle body cover 30 and the like removed to expose the fuel tank 29. As shown in FIG.
The fuel tank structure includes a fuel tank 29 , a cap 50 that openably closes a filler port 63 ( FIG. 3 ) described later, and a tray member 51 that receives fuel spilled around the filler port 63 .

FIG. 3 is a top plan view of the upper portion of the fuel tank 29 with the cap 50 removed. FIG. 4 is a side perspective view of the upper portion of the fuel tank 29 with the cap 50 removed. FIG. 5 is a side perspective view of the upper portion of the fuel tank 29 with the cap 50 and the tray member 51 removed. FIG. 6 is an exploded perspective view showing parts related to the filler port 63 in the fuel tank structure.

2 to 6, the top surface 29a of the fuel tank 29 is provided with a bulging portion 60 that bulges upward from the top surface 20a.
The bulging portion 60 includes an upper wall portion 61 located above the upper surface 29 a and a peripheral wall portion 62 extending downward from the entire periphery of the upper wall portion 61 .
The upper wall portion 61 is substantially circular in plan view. The peripheral wall portion 62 has an annular shape in plan view.

The fuel filler port 63 is formed in a vertically extending cylindrical shape by bending the inner peripheral portion of a hole formed in the upper wall portion 61 .
An inner peripheral portion of the fuel filler port 63 is an opening penetrating through the upper wall portion 61 in the vertical direction. The fuel filler port 63 is provided at the center of the upper wall portion 61 in plan view. Fuel is injected into the fuel tank 29 through the filler port 63 .

An upper surface 29 a of the fuel tank 29 is provided with an opening 29 b having an inner diameter substantially equal to the outer diameter of the peripheral wall portion 62 .
A lower end portion of the peripheral wall portion 62 is fitted into the opening portion 29b. The bulging portion 60 is joined to the fuel tank 29 by a weld bead 64 that goes around along the inner circumference of the opening 29b. The weld bead 64 welds the inner periphery of the opening 29 b and the outer periphery of the lower end of the peripheral wall 62 .

FIG. 7 is a perspective view of the bulging portion 60 as seen from below. FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG.
3 to 8, a cylindrical member 66, a reinforcing member 67, a fixing nut 68, and a connecting member 69 are attached to the lower surface of the bulging portion 60 so as to extend downward with respect to the filler port 63. As shown in FIGS. The lower surface side of the bulging portion 60 is the side of the bulging portion 60 located inside the fuel tank 29 .

The tubular member 66 is a cylinder that opens upward and downward. The tubular member 66 is a cylinder with a diameter larger than that of the fuel filler port 63 . The cylindrical member 66 is provided in a substantially coaxial positional relationship with the fuel filler port 63 . The cylindrical member 66 is fixed to the bulging portion 60 by welding the upper end portion to the lower surface of the upper wall portion 61 .
The reinforcing member 67 is a plate-like member that connects the outer circumference of the tubular member 66 and the lower surface of the upper wall portion 61 to reinforce the fixation of the tubular member 66 .
When refueling, a refueling nozzle at a refueling station or the like is inserted into the refueling port 63 and the tubular member 66 . A tubular member 66 regulates the position of the fuel nozzle within the fuel tank 29 .
A stopper member (not shown) is provided at the lower end of the cylindrical member 66 to restrict downward movement of the fuel nozzle.

The upper wall portion 61 is provided with a plurality of (three in the present embodiment) fixing holes 61 a passing through the upper wall portion 61 . The fixing hole portion 61 a is arranged around the fuel filler port 63 .
The fixing nut 68 is arranged directly below each fixing hole 61a in a coaxial positional relationship with the fixing hole 61a. The fixed nut 68 is a weld nut welded to the lower surface of the upper wall portion 61 .
A female screw portion of the fixing nut 68 is exposed upward from the fixing hole portion 61a.
The fixing hole portion 61a and the fixing nut 68 constitute a cap fixing portion 70 to which the cap 50 is fixed.

The connecting member 69 is a pipe wired in the space inside the bulging portion 60 . Connection member 69 is provided around fuel filler port 63 .
One end portion 69a of the connection member 69 penetrates the peripheral wall portion 62 from within the bulging portion 60 and protrudes laterally outward. The other end portion 69b of the connection member 69 penetrates the upper wall portion 61 from within the bulging portion 60 and protrudes upward and outward. The one end portion 69a and the other end portion 69b are connected to the bulging portion 60 by welding.
The one end portion 69a is a pipe connection portion to which one end of the pipe 71 is connected. A pipe 71 extends downward from the bulging portion 60, and the other end of the pipe 71 is connected to a canister (not shown). This canister contains an adsorbent such as activated carbon in a case, and adsorbs evaporated fuel in the fuel tank 29 .

The tray member 51 includes a bottom wall portion 51a and a tray peripheral wall portion 51b extending upward from the peripheral edge of the bottom wall portion 51a.
The bottom wall portion 51a is substantially circular in plan view. The tray peripheral wall portion 51b is an annular wall portion provided around the entire circumference of the bottom wall portion 51a.

The tray member 51 is attached to the upper surface of the bulging portion 60 . Specifically, the tray member 51 has the bottom wall portion 51 a attached to the top wall portion 61 of the bulging portion 60 .
The bottom wall portion 51a of the tray member 51 includes a tray opening portion 51c fitted to the outer circumference of the fuel filler port 63, a second opening portion 51d penetrating the bottom wall portion 51a, and extending upward from the bottom wall portion 51a. A cylindrical boss portion 51e is provided. The second opening 51 d and the boss 51 e are provided around the fuel filler port 63 .
The fuel filler port 63 is exposed upward from the tray opening 51c. The other end 69b of the connecting member 69 is exposed upward from the second opening 51d.

The tray member 51 also includes a pipe-shaped connection portion 51f extending outward from the tray peripheral wall portion 51b.
One end of the drain pipe 72 is connected to the connecting portion 51f. The drain pipe 72 extends downward from the tray member 51, and the other end of the drain pipe 72 opens downward.
Fuel spilled from the fuel nozzle onto the tray member 51 and water accumulated in the tray member 51 flow from the connecting portion 51f to the drain pipe 72 and are discharged from the other end of the drain pipe 72 to the outside.

2 and 6, the cap 50 includes a cap body 50a that closes the filler port 63 from above, and a support member 50b that swingably supports the cap body 50a.
The cap 50 is circular in plan view from above.
The support member 50b has a ring shape surrounding the cap 50 from the outer peripheral side in plan view from above.

The cap main body 50a is swingably supported by a swing shaft 50c provided at the rear portion of the support member 50b. The swing shaft 50c is a shaft extending in the vehicle width direction, and the cap body 50a swings up and down around the swing shaft 50c.
In FIG. 2, the filler port 63 is closed by the cap main body 50a. As indicated by a phantom line in FIG. 2, when the cap body 50a is opened by swinging rearward and upward about the swing shaft 50c, the fuel filler port 63 is exposed upward.

3 to 6 and 8, the support member 50b has a first mounting portion 50d and a second mounting portion 50e extending downward.
The first attachment portion 50d is positioned in front of the cap body 50a. The second attachment portion 50e is positioned behind the cap body 50a.
The cap 50 is placed over the tray member 51 from above.
The cap 50 is attached to the upper wall portion 61 of the bulging portion 60 via the support member 50b.
The first attachment portion 50d of the support member 50b passes through the inside of the boss portion 51e of the tray member 51 and comes into contact with the upper wall portion 61 of the swelling portion 60. As shown in FIG.
The second mounting portion 50e of the support member 50b passes through the second opening 51d of the tray member 51 and contacts the upper wall portion 61 of the bulging portion 60. As shown in FIG.
The first mounting portion 50d and the second mounting portion 50e may contact the upper wall portion 61 via the bottom wall portion 51a of the tray member 51 instead of directly contacting the upper wall portion 61. FIG.

The cap 50 is fastened to the cap fixing portion 70 of the upper wall portion 61 by a plurality of cap fixing tools 75 inserted through the support member 50b from above. The cap fixture 75 is, for example, a bolt and is screwed onto the fixing nut 68 .
One of the cap fasteners 75 is inserted through the first mounting portion 50d of the support member 50b from above and fastened to the front cap fixing portion 70. As shown in FIG.
Another cap fixing member 75 is inserted through the second attachment portion 50e of the support member 50b from above and fastened to the cap fixing portion 70 on the rear side. A pair of left and right cap fixtures 75 are provided.
The tray member 51 is sandwiched between the support member 50 b of the cap 50 and the upper wall portion 61 of the bulging portion 60 .

The cap body 50 a has a passage (not shown) that connects the inside of the fuel tank 29 and the other end 69 b of the connecting member 69 . Evaporated fuel in the fuel tank 29 flows from the passage to the connection member 69 and then to the canister through the pipe 71 .

1 and 2, the fuel tank 29 is covered with a tank cover 43 from above and from the left and right sides. The cap 50 is exposed upward from a cover opening (not shown) provided on the upper surface of the tank cover 43 .
The tray member 51 and the bulging portion 60 are covered and hidden from the outside by the tank cover 43 .

In the fuel tank 29, since the fuel filler port 63 is provided in the swelling portion 60 having the peripheral wall portion 62, the fuel filler port 63 can be provided at a high position. Since the cap 50 that swings to open and close is fixed to the bulging portion 60 like the filler port 63, the positional accuracy of the filler port 63 and the cap 50 can be increased. Therefore, the cap 50 can satisfactorily block the filler port 63 .

The bulging portion 60 is formed by pressing a metal plate using a mold. Further, the fuel filler port 63 and the fixing hole portion 61a are also formed by press working. As a result, the shape of the bulging portion 60 and the positions of the fuel filler port 63 and the fixing hole portion 61a can be precisely determined, so that the fuel filler port 63 can be satisfactorily closed by the cap 50. FIG.

As described above, according to the embodiment to which the present invention is applied, the fuel tank structure consists of the fuel filler port 63 provided on the upper surface 29a of the fuel tank 29 and the cap 50 that opens and closes the fuel filler port 63 by swinging. The upper surface 29a of the fuel tank 29 is provided with a bulging portion 60 that bulges upward. The peripheral wall portion 62 of the bulging portion 60 is joined to the fuel tank 29, the fuel filler port 63 is provided on the upper wall portion 61, and the cap fixing portion 70 to which the cap 50 is fixed is provided on the upper side. It is provided on the wall portion 61 .
According to this configuration, since the fuel filler port 63 and the cap fixing portion 70 are provided on the upper wall portion 61 of the bulging portion 60, the positional accuracy of the fuel filler port 63 and the cap fixing portion 70 can be increased. Therefore, the cap 50 that closes the fuel filler port 63 by swinging can be attached to the fuel tank 29 with high accuracy. Moreover, since the cap 50 can be fixed to the bulging portion 60 without using a dedicated stay or the like, the number of parts can be reduced.

Moreover, the peripheral wall portion 62 is joined to the inner peripheral portion of the opening 29b provided in the upper surface 29a.
With this configuration, the peripheral wall portion 62 is joined to the inner peripheral portion of the opening 29 b of the fuel tank 29 , so that the bulging portion 60 can be firmly fixed to the fuel tank 29 . Therefore, even if the fuel tank is subjected to an impact, deformation of the bulging portion 60 can be reduced, and the fuel filler port 63 can be satisfactorily closed by the cap 50 .

A connecting member 69 to which a pipe 71 extending outward from the fuel tank 29 is connected is provided, and the connecting member 69 is joined to the bulging portion 60 .
According to this configuration, the connecting member 69 can be provided with a simple structure using the bulging portion 60 .

A tray member 51 is attached to the upper wall portion 61 to receive fuel spilled around the fuel filler port 63 .
According to this configuration, the tray member 51 can be attached near the fuel filler port 63 with a simple structure.

Furthermore, the tray member 51 is sandwiched between the cap 50 and the upper wall portion 61 .
According to this configuration, by sandwiching the tray member 51 between the cap 50 and the upper wall portion 61, the tray member 51 can be fixed with a simple structure.

A pipe 71 is a pipe that connects the fuel tank 29 and a canister that adsorbs evaporated fuel in the fuel tank 29 . One end 69 a and the other end 69 b of are connected to the bulging portion 60 .
According to this configuration, by arranging the connection member 69 in the bulging portion 60, the connection member 69 can be protected, and the appearance of the connection member 69 can be improved by preventing the connection member 69 from standing out.

Further, the cap 50 includes a cap body 50 a that closes the fuel filler port 63 and a support member 50 b that supports the cap body 50 a so as to swing.
According to this configuration, by fixing the support member 50b to the cap fixing portion 70, the positional accuracy between the fuel filler port 63 and the support member 50b can be increased. Therefore, the cap main body 50a that is swingably supported by the support member 50b can satisfactorily close the fuel filler port 63. As shown in FIG.

In addition, the above-described embodiment shows one mode to which the present invention is applied, and the present invention is not limited to the above-described embodiment.
In the above embodiment, the fuel tank structure mounted on the saddle type vehicle 10, which is a motorcycle, has been described as an example, but the present invention is not limited to this, and the present invention is applicable to vehicles other than motorcycles. The present invention can also be applied to a vehicle and a fuel tank structure mounted on a vehicle other than the vehicle.

[Configuration supported by the above embodiment]
The above embodiment supports the following configurations.

(Configuration 1) In a fuel tank structure including a fuel filler port provided on the top surface of the fuel tank and a cap that opens and closes the fuel filler port by swinging, the top surface of the fuel tank has a bulge that bulges upward. A protruding portion is provided, and the protruding portion includes an upper wall portion and a peripheral wall portion extending downward from a peripheral edge of the upper wall portion, and the peripheral wall portion of the protruding portion is joined to the fuel tank. The fuel tank structure is characterized in that the fuel filler port is provided on the upper wall portion, and a cap fixing portion to which the cap is fixed is provided on the upper wall portion.
According to this configuration, since the fuel filler port and the cap fixing portion are provided on the upper wall portion of the bulging portion, it is possible to increase the positional accuracy of the fuel filler port and the cap fixing portion. Therefore, it is possible to attach the cap to the fuel tank with a high degree of accuracy so that it can be opened and closed by swinging to close the filler port. Moreover, since the cap can be fixed to the bulging portion without using a dedicated stay or the like, the number of parts can be reduced.

(Arrangement 2) The fuel tank structure according to Arrangement 1, wherein the peripheral wall portion is joined to an inner peripheral portion of an opening provided in the upper surface.
According to this configuration, since the peripheral wall portion is joined to the inner peripheral portion of the opening of the fuel tank, the bulging portion can be firmly fixed to the fuel tank. Therefore, even if the fuel tank is subjected to an impact, deformation of the bulging portion can be reduced, and the fuel filler port can be satisfactorily closed by the cap.

(Arrangement 3) A fuel tank structure according to Arrangement 1 or 2, wherein a connection member is provided to which a pipe extending outward from the fuel tank is connected, and the connection member is joined to the bulging portion. .
According to this configuration, the connection member can be provided with a simple structure using the bulging portion.

(Arrangement 4) The fuel tank structure according to any one of arrangements 1 to 3, wherein a tray member for receiving fuel spilled around the filler port is attached to the upper wall portion.
According to this configuration, the tray member can be attached near the fuel filler port with a simple structure.

(Configuration 5) The fuel tank structure according to configuration 4, wherein the tray member is sandwiched between the cap and the upper wall portion.
According to this configuration, the tray member can be fixed with a simple structure by sandwiching the tray member between the cap and the upper wall portion.

(Configuration 6) The pipe is a pipe that connects the fuel tank and a canister that adsorbs evaporated fuel in the fuel tank, and the connection member is a pipe that is routed in the bulging portion. The fuel tank structure according to configuration 3, wherein one end and the other end of are connected to the bulging portion.
According to this configuration, by arranging the connection member in the bulging portion, the connection member can be protected, and the appearance of the connection member can be improved by suppressing the conspicuousness of the connection member.

(Arrangement 7) The cap includes a cap body that closes the fuel filler port, and a support member that supports the cap body so as to be swingable, and the support member is fixed to the cap fixing portion. 7. A fuel tank structure according to any one of configurations 1 to 6.
According to this configuration, by fixing the support member to the cap fixing portion, it is possible to increase the positional accuracy between the filler port and the support member. Therefore, the fuel filler port can be satisfactorily closed by the cap body that is swingably supported by the support member.

29 fuel tank 29a upper surface 29b opening 50 cap 50a cap main body 50b support member 51 tray member 60 swelling portion 61 upper wall portion 62 peripheral wall portion 63 fuel filler port 69 connecting member 69a one end portion 69b other end portion 70 cap fixing portion 71 pipe

Claims (7)

A fuel tank structure comprising: a fuel filler port (63) provided on the top surface (29a) of a fuel tank (29);
The upper surface (29a) of the fuel tank (29) is provided with a bulging portion (60) that bulges upward,
The bulging portion (60) includes an upper wall portion (61) and a peripheral wall portion (62) extending downward from the peripheral edge of the upper wall portion (61),
The peripheral wall portion (62) of the bulging portion (60) is joined to the fuel tank (29),
The fuel filler port (63) is provided in the upper wall portion (61),
A fuel tank structure, wherein a cap fixing portion (70) to which the cap (50) is fixed is provided on the upper wall portion (61). 2. A fuel tank structure according to claim 1, wherein said peripheral wall portion (62) is joined to an inner peripheral portion of an opening (29b) provided in said upper surface (29a). A connection member (69) is provided to which a pipe (71) extending outward from the fuel tank (29) is connected, and the connection member (69) is joined to the bulging portion (60). 3. The fuel tank structure according to claim 1 or 2. 4. A fuel tank structure according to any one of claims 1 to 3, wherein a tray member (51) for receiving fuel spilling around said filler port (63) is attached to said upper wall portion (61). 5. A fuel tank structure according to claim 4, wherein said tray member (51) is sandwiched between said cap (50) and said upper wall portion (61). The pipe (71) is a pipe that connects the fuel tank (29) and a canister that adsorbs evaporated fuel in the fuel tank (29),
The connecting member (69) is a pipe routed in the bulging portion (60),
4. The fuel tank structure according to claim 3, wherein one end (69a) and the other end (69b) of the connecting member (69) are connected to the bulging portion (60). The cap (50) includes a cap body (50a) that closes the filler port (63), and a support member (50b) that rockably supports the cap body (50a),
The fuel tank structure according to any one of claims 1 to 6, wherein the support member (50b) is fixed to the cap fixing portion (70).

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