JPH10258785A - Fuel tank inner structure for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the splash of fuel poured from a tube filler into a fuel tank and prevent the leakage from the tube filler by integrally forming an oil feed guide in a downward recess part in a part opposed to an opening of the oil feed tube filler provided in the fuel tank. SOLUTION: A downward recess part 15 of a tank inner 16 of a fuel tank is so formed that a part to be the top in the center is projected into a roof shape along a tank rail 17 in the fuel tank and the bending degree of a bend surface 21 of the downward recess part 15 in a part opposed to the opening part 13a in the bottom end of a tube filler 13 and a bend surface 22 in a part not opposed to the opening part 13a are formed differently. That is to say, the bending degree of the bend surface 21 of the oil feed part is set to large and formed into a sharply curved shape to the left/right by a press working, etc., so as to prevent the splash in feeding the oil and let the fuel smoothly flow in both sides of the downward recess part 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank inner structure of a motorcycle, and more particularly to a fuel tank inner structure in a case where a fuel tank is mounted across a tank rail provided on a frame.

[0002]

2. Description of the Related Art A motorcycle fuel tank has a tank outer having an upper surface on which a tube filler serving as a fuel filler is mounted to form an outer surface of the tank, and a groove-shaped downward facing curved lower surface of the tank along the vehicle longitudinal direction. The tank is formed so as to straddle the tank rail of the frame by the downward recess.

[0003] The fuel tank is mounted on the frame by a rubber cylindrical locking portion protruding outward on the lower side of both sides of the tank rail, and provided on both side walls of the downward recessed portion of the tank inner in the front of the vehicle body. The fitting is performed by fitting a U-shaped receiving portion that opens to the front side and fixing the flange at the rear end of the tank to the cross pipe of the frame.

The U-shaped receiving portion is attached to both side walls of the downward concave portion via rectangular plate-like patches, and has a downwardly curved cross-sectional shape corresponding to a cylindrical locking portion projecting substantially horizontally. Both side walls of the left and right inner surfaces of the concave portion are formed on substantially vertical surfaces. The upper surface of the tank inner connecting the left and right vertical walls of such a tank inner has to be lowered in order to increase the capacity, the curved surface becomes loose, the curved surface is bent or greatly curved at both ends, and the central portion is a curved surface almost flat. Become.

[0005]

However, if the upper surface of the tank inner is a nearly flat curved surface, the fuel poured into the fuel tank from the refueling nozzle inserted in the tube filler facing this surface is flat. There was a risk that it would bounce off the top of the nearby tank inner and overflow from the tube filler. In this case, if the tube filler is shortened and its lower surface is provided as far as possible away from the upper surface of the tank inner, the leakage of fuel scattered from the tube filler can be prevented to some extent. Due to the necessity of providing an air pool for fuel expansion and absorption at the time of fuel filling, the tube filler cannot be shortened to some extent or more.

The present invention has been made in view of the above circumstances, and has as its object to provide a fuel tank inner structure in which fuel poured into a fuel tank from a tube filler does not rebound and overflow from the tube filler. And

[0007]

In order to achieve the above object, according to the present invention, a tank inner of a fuel tank is provided with:
In a fuel tank inner structure which forms a groove-shaped downward concave portion having a curved cross-sectional shape for mounting the fuel tank across one tank rail provided on a frame,
In a portion of the downward concave portion facing an opening of a refueling tube filler provided in the fuel tank, a refueling guide for preventing rebound of fuel at the time of refueling is formed integrally with the downward concave portion. To provide a motorcycle fuel tank inner structure.

According to the above configuration, even when the distance between the lower end of the opening of the tube filler and the upper surface of the tank inner is short,
The fuel poured into the fuel tank flows along the refueling guide while being guided by a refueling guide formed in a portion of the downward recessed portion facing the opening of the tube filler. As a result, in the portion of the tank inner opposed to the opening of the tube filler, the fuel poured into the fuel tank vigorously does not hit the flat surface and bounce off, and the poured fuel overflows from the tube filler. It can be prevented from coming out.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment,
The refueling guide is formed such that the inclination of the left-right curved surface in the portion facing the opening is substantially steeper than the inclination of the left-right curved surface in the portion not facing the opening. Features.

With this configuration, the fuel poured into the fuel tank is guided to the steeply inclined left and right curved surface formed in the portion of the downward concave portion facing the opening of the tube filler, and is distributed to both sides thereof. Flows along the curved surface.
As a result, in the portion of the tank inner facing the opening of the tube filler, the fuel poured into the fuel tank vigorously does not hit the flat surface and bounce off, and the poured fuel overflows from the tube filler. Can be prevented.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a motorcycle having a fuel tank inner structure according to one embodiment of the present invention. FIG.
FIG. 2 is a partial explanatory view showing a tank inner of a fuel tank of the motorcycle of FIG. 1. FIG. 3 is an explanatory diagram showing a positional relationship between a tank inner of the fuel tank of FIG. 2 and a refueling nozzle inserted.

As shown in FIG. 1, the motorcycle 10 has a fuel tank 11 in the upper front portion of the center of the vehicle body, and a pair of right and left flasher lights 12 in the front and rear portions of the vehicle body, respectively. Only one side is shown).

As shown in FIG. 2, a fuel tank 11 is provided with a tube filler 13 serving as an oil supply port at the center of the upper surface in the width direction, and has a tank outer 14 forming an outer surface of the tank.
And a tank inner 16 that forms a groove-shaped downward recess 15 (see FIG. 3) having a curved cross section along the vehicle front-rear direction on the lower surface of the tank, and the downward recess 15 forms a frame of the motorcycle 10. It is mounted so as to straddle the tank rail 17. Tube filler 13
, So that most of them are buried inside the fuel tank 11,
For example, it is attached to the tank outer 14 by bead welding. The tank outer 14 and the tank inner 16
Are joined along the joining surface 140 by, for example, seam welding.

The attachment of the fuel tank 11 to the frame
A rubber cylindrical locking portion (not shown) protruding outwardly below both sides of the tank rail 17 is provided with a tank inner 1.
6 are provided on both side walls of the downward concave portion 15, and are fitted with laterally U-shaped receiving portions 19 that open toward the front of the vehicle body, and the flange at the rear end of the fuel tank 11 is fixed to the cross pipe of the frame. (Not shown). One tank rail 17 passing substantially in the center in the vehicle width direction is inclined downward from the front end to the rear end of the fuel tank 11 (FIG. 1).
reference). Along with this, the downward recess 15 of the fuel tank bottom surface is also inclined downward from the front end to the rear end of the fuel tank 11.

As shown in FIG. 3, the downward recessed portion 15 of the tank inner 16 has a central upper portion in the fuel tank 1.
1 protrudes along the tank rail 17 in a ridge shape. The curved surface 21 of the downward concave portion 15 in the portion (oil supply portion) facing the opening 13a at the lower end of the tube filler 13 and the curved surface 22 of the portion not facing the opening 13a are formed with different degrees of curvature. ing. That is, the curved surface 21 of the refueling portion is narrowed down by press working or the like so as to have a large degree of curvature and to be steeply inclined to the left and right in order to prevent rebound from occurring at the time of refueling and smoothly flow the fuel into both sides of the downward recess 15. It is formed. The curved surface 21 facing the opening 13a is continuous with the curved surface 22 not facing the opening 13a by the connecting surface 24 (see FIG. 2) whose front shape is gradually changed, and has a rear shape. Are connected to the rear end side of the fuel tank 11 by the gradually changing connection surface 25 (see FIG. 2).

The curved surface 2 not facing the opening 13a
The lower side wall 2 forms a substantially vertical surface because the lower side walls form a receiving portion 19 for attachment to the vehicle body, and the upper surface is substantially flat through the arc portions at both ends continuously to this vertical surface. It becomes a gentle curved surface (see FIG. 3). A projection 22a is formed on the top of the curved surface 22 that does not face the opening 13a in consideration of material distortion, elongation, and the like at the time of pressing the curved surface 21 of the oil supply unit.

On the other hand, the curved surface 21 of the refueling section is located within a range A facing the opening 13a in the vehicle width direction.
The degree of curvature is large, and the left and right curved surfaces are substantially steeply inclined than the inclination of the left and right curved surfaces of the portion not facing the opening 13a. Such a sharply inclined left and right curved surface of the curved surface 21 of the refueling portion prevents rebounding during refueling and guides the fuel into the tank.

Below the curved surface 21 in the portion facing the opening 13a, a substantially vertical surface is formed which is continuous with the lower side walls of the curved surface 22 in the portion not facing the opening 13a. Each of the vertical surfaces has a rectangular plate-shaped patch 2
6 (see FIG. 2) is attached by, for example, spot welding, and each patch 26 has a U-shaped receiving portion 19 as described above.
Are mounted with their openings facing the front end side of the fuel tank 11 by, for example, MIG welding.

In the fuel tank inner structure having the above structure, when fuel is supplied to the fuel tank 11, a fuel supply nozzle 27 is inserted from the tube filler 13 into the fuel tank 11. When refueling is started and fuel is poured into the fuel tank 11 from a refueling nozzle 27 inserted into the tube filler 13, the fuel is guided by the steeply curved surface 21 and is distributed to both sides thereof. Along the flow path and is stored in the fuel tank 11.

Therefore, the opening 13 of the tube filler 13
a When the distance between the lower end and the upper surface of the tank inner 16 (the upper forming surface of the downward concave portion 15) is short, and the refueling nozzle 27 inserted into the tube filler 13 is close to the upper surface of the tank inner 16 (FIG. 27a), the steeply curved surface 21 formed integrally with the downward recess 15 in the portion of the downward recess 15 facing the opening 13a of the tube filler 13 causes the fuel tank 1 to move from the refueling nozzle 27.
Since the fuel poured vigorously into 1 does not hit the substantially flat surface and rebound as in the prior art, the rebound of fuel from the tube filler 13 during refueling can be prevented.

Further, the refueling nozzle 27 is connected to the tube filler 1.
3, the refueling nozzle 27 can be inserted more deeply along the curved surface 21 of the tank inner 16 when the oblique insertion is performed at a substantially maximum inclination angle with respect to the inner surface 3 (see the dashed line 27b in FIG. 3). Connection surfaces 24 and 25 before and after
As a result, the fuel supply nozzle is held and the fall in the front-rear direction is also prevented, so that the rebound of fuel at the time of refueling can be more reliably prevented.

FIG. 4 is a front view showing the mounting structure of the rear flasher light. FIG. 5 is an explanatory sectional view showing a mounting structure of the flasher light of FIG. FIG. 6 is an explanatory view of the mounting structure of the flasher light of FIG.

As shown in FIG. 4, the flasher light 12 at the rear of the vehicle body includes a bracket attached to a frame via an anti-vibration grommet 31 through an arm portion 30a of a light case 30 containing a lamp bulb (not shown). (Stay) 32 is attached. The arm 30a is formed by, for example, zinc die casting.

As shown in FIG. 5, the grommet 31 for vibration isolation is used.
Is made of an elastic member such as rubber, for example.
A bolt hole 34 for projecting a bolt 33 for mounting the flasher light 12 protruding from the mounting end face of the flasher light 12, and a flasher lead wire 35 for supplying power to the flasher light 12
A lead wire hole 36 through which the lead wire hole 3 is formed is formed.
Adjacent to 6, a columnar detent 37 protrudes. A groove-like cut 38 is formed on the outer peripheral surface of the vibration-isolating grommet 31 toward the center, and the arm portion 30a is provided on the end surface of the vibration-isolating grommet 31 on the arm portion 30a side.
A locking recess 40 is formed to lock the positioning projection 39 provided on the mounting end face. Bracket 32
Has a mounting hole 41 at which the tip of the plate body is bent in an L-shape (see FIG. 4) and the anti-vibration grommet 31 is attached at the tip (see FIG. 5).

A collared washer 42 is mounted on the outer end surface of the vibration-proof grommet 31. The collar-equipped washer 42 has a cylindrical collar 42b projecting from the lower surface of a washer 42a covering the outer end surface and inserted into the bolt hole 34 through the bolt 33. Washer 42
A slot 43 for exposing the detent 37 and the lead wire hole 36 of the vibration-proof grommet 31 is formed in a.

As shown in FIG. 6, a washer 4 with a collar is provided.
A ground terminal 44 is mounted on the upper surface of the second terminal 2. The ground terminal 44 is made of a thin conductive plate having a thickness of about 0.5 to 0.6 mm (see FIG. 5), and has a mounting hole 44a through which the bolt 33 passes. This ground terminal 44
Is connected to a ground wire 45 connected to a ground connection portion such as an unpainted portion of the frame.

In the flasher light mounting structure having the above configuration, first, the vibration isolating grommet 31 is inserted into the mounting hole 41 of the bracket 32, and the vibration isolating grommet 31 is inserted.
Is fixed to the bracket 32 (see FIG. 5).

Next, the arm portion 30a of the flasher light 12 is mounted on the vibration-proof grommet 31. That is, the bolt 33 is inserted into the bolt hole 34 of the vibration-proof grommet 31,
The flasher lead wire 35 is passed through the lead wire hole 36, and the positioning projection 39 is locked in the locking recess 40. By locking the positioning projections 39 to the locking recesses 40, the flasher light 12 can be positioned at a predetermined position facing the specified irradiation direction (see FIG. 5).

Next, the bolt 3 projecting from the bolt hole 34
3 is inserted into the bolt hole 34 and the washer 42a is prevented from rotating through the long hole 43 of the washer 42a.
And the lead wire hole 36 are exposed, and the washer 4
2 is mounted on the anti-vibration grommet 31 (see FIG. 6).

Next, the ground terminal 44 is mounted on the washer 42 with the collar by tightening the nut 46 to the bolt 33. When the nut 46 is tightened, the ground terminal 44 is sandwiched between the washer 42a and the nut 46. When the nut 46 is further tightened, the ground terminal 44 rotates clockwise with the nut 46 in the rotation direction. Rotating earth terminal 44
Is disposed at a position slightly counterclockwise with respect to the detent 37 at the time of mounting, and the nut is tightened and fixed from this position. As a result, the ground terminal 44 hits the detent 37 projecting from the long hole 43 of the washer 42a with the tightening of the nut, and the rotation is prevented and the positioning is assured (see FIG. 6).

When the nut 46 is tightened, the arm 30a of the flasher light 12 to which the washer 42 with the collar is attached together with the ground terminal 44 is mounted on the bracket 32 via the vibration-proof grommet 31. By mounting the flasher light 12 via the vibration damping grommet 31 having a damper function, it is possible to prevent the lamp bulb from being damaged due to the resonance of the flasher light 12 due to engine vibration or the like. The flasher lead wire 35 taken out from the lead wire hole 36 is hooked on a hook 47 attached to the frame (see FIG. 4).

As described above, by forming the rotation stopper 37 on the vibration-proof grommet 31, a new function can be added to the existing member, and the ground terminal 44 at the time of tightening can be added.
Can be prevented from being deformed. That is, in the conventional case using a cut-and-raised portion formed in a washer made of a sheet metal material as the detent 37 of the ground terminal 44, in the case of the ground terminal 44 which is easily bent and deformed with a thin plate, the cut-and-raised portion is tightened. It was inevitable that it would easily deform. On the other hand, since the rotation of the ground terminal 44 is stopped by hitting the soft detent 37 made of rubber, it is possible to prevent the ground terminal 44 from being bent and deformed by tightening the nut 46.

Further, the efficiency of the line operation is reduced as compared with the conventional case where the nut is tightened while the rotation of the ground terminal 44 is stopped by the line operation without determining the rotation angle of the flasher lead wire 35 without providing the rotation stop. Can be achieved. Further, since no rotation stopper is provided by cutting and raising the sheet metal or the like, manufacturing costs can be reduced.

The flasher lead 35 protruding from the lead hole 36 adjacent to the detent 37 interferes with the ground terminal 44 because the lead hole 36 is located on the line connecting the detent 37 and the nut 46. There is no. Also,
The shape and size of the detent 37 are arbitrarily selected according to the hardness of the rubber member forming the vibration-proof grommet 31.

[0035]

As described above, according to the fuel tank inner structure of the present invention, even when the distance between the lower end of the opening of the tube filler and the upper surface of the tank inner is short, the fuel is poured into the fuel tank. Since the fuel flows along the fueling guide guided by the fueling guide formed of, for example, a steeply curved surface formed in the portion of the downward concave portion facing the opening of the tube filler, the fuel flows into the opening of the tube filler of the tank inner. In the opposing portion, the fuel poured vigorously into the fuel tank does not bounce against the flat surface, and it is possible to prevent the poured fuel from overflowing from the tube filler.

In the fuel supply guide, the inclination of the left-right curved surface in the portion facing the opening is substantially steeper than the inclination of the left-right curved surface in the portion not facing the opening. With this configuration, the fuel poured into the fuel tank is guided by the steeply inclined left and right curved surface formed in the portion of the downward concave portion facing the opening of the tube filler, and is distributed to both sides thereof. As the fuel flows along the curved surface, the fuel that has been poured vigorously into the fuel tank does not bounce off the flat surface at the portion of the tank inner that faces the opening of the tube filler. It is possible to prevent the fuel from overflowing from the tube filler.

[Brief description of the drawings]

FIG. 1 is a side view of a motorcycle having a fuel tank inner structure according to one embodiment of the present invention.

FIG. 2 is a partial explanatory view showing a tank inner of a fuel tank of the motorcycle of FIG. 1;

FIG. 3 is an explanatory diagram showing a positional relationship between a tank inner of the fuel tank of FIG. 2 and a refueling nozzle inserted.

FIG. 4 is a front view showing a mounting structure of a rear flasher light.

FIG. 5 is an explanatory sectional view showing a mounting structure of the flasher light of FIG. 4;

FIG. 6 is an explanatory view of the mounting structure of the flasher light of FIG.

[Explanation of symbols]

10: motorcycle, 11: fuel tank, 12: flasher light, 13: tube filler, 13a: opening, 1
4: tank outer, 15: downward recess, 16: tank inner, 17: tank rail, 19: receiving portion, 21: curved surface, 22: curved surface, 22a: projection, 26: patch, 2
7: refueling nozzle, 30: light case, 30a: arm part, 31: anti-vibration grommet, 32: bracket, 3
3: bolt, 35: flasher lead wire, 36: lead wire hole, 37: detent, 38: cut, 39: positioning projection, 40: locking recess, 42: collar washer,
43: long hole, 44: ground terminal, 46: nut.

Claims (2)

[Claims] 1. A fuel tank having a groove-shaped downward recess having a curved cross-section for mounting the fuel tank over a tank rail provided on a frame in a tank inner of a motorcycle fuel tank. In the inner structure, a fueling guide for preventing fuel from rebounding at the time of refueling is integrally formed in the downwardly facing recess in a portion of the downwardly facing recess facing an opening of a refueling tube filler provided in the fuel tank. A fuel tank inner structure for motorcycles, characterized in that: 2. The fuel supply guide according to claim 1, wherein the inclination of the left-right curved surface in the portion facing the opening is substantially steeper than the inclination of the left-right curved surface in the portion not facing the opening. The motorcycle fuel tank inner structure according to claim 1, wherein the inner structure is formed.