JPH06191456A - Fuel tank for motorcycle - Google Patents

Abstract

PURPOSE:To prevent an engine from being stained by fuel overflowing out of a fuel tank. CONSTITUTION:A brim member 16 gradually extended outside in the width direction as it goes downward, is provided for the lower peripheral section of a fuel tank main body 15. The aforesaid brim member 16 is so formed as to be positioned in the inner side of a body than the outermost side surface of the fuel tank main body 15 at its extended end in the width direction in a plan view. Fuel flowing down along the side surface of the fuel tank main body 15, drops down along the brim member 16 out of its extended end from the lower peripheral section of the fuel tank main body 15. Since the substantial width of the lowermost section of the tank is widened by the brim member 16, fuel overflowing out of the fuel tank 13 drops down to the side of a cylinder 11, and no fuel will never stick onto the cylinder 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel tank for a motorcycle arranged above an engine of the motorcycle.

[0002]

2. Description of the Related Art In many conventional motorcycles, a fuel tank is arranged in front of a seat and right above an engine. Since most of the fuel tanks of this type are formed such that the lower edges of the left and right sides are located inward in the vehicle width direction, the lowermost part of the tank may be located near the engine cylinder.

[0003]

However, when the fuel tank is arranged above the engine as described above, if the fuel overflows from the fuel filler port when refueling, the cylinder of the engine is easily contaminated by the fuel. That is, it is troublesome to wipe off the fuel adhering to the cylinder.

The present invention has been made to solve the above problems, and an object thereof is to prevent the engine from being contaminated even if the fuel overflows during refueling.

[0005]

In a fuel tank for a motorcycle according to the present invention, a flange member is attached to a lower edge portion of a fuel tank main body so as to gradually extend outward in the vehicle width direction as it extends downward. The extension end on the outer side in the vehicle width direction is formed so as to be located inside the vehicle body from the outermost surface of the fuel tank main body in plan view.

[0006]

The fuel flowing down along the side surface of the fuel tank main body is dropped from the lower end of the fuel tank main body through the flange member from the extending end of the flange member. Therefore, the substantial width of the lower edge portion of the tank is expanded by the collar member.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a side view of a motorcycle equipped with a fuel tank according to the present invention, FIG. 2 is a side view showing an enlarged main part, and FIG. 3 is a lower part III of the fuel tank in FIG.
It is a III-line sectional view. Note that FIG. 3 shows only the right side of the vehicle body with respect to the center of the vehicle body shown by the one-dot chain line C in the figure.

In these figures, 1 is a motorcycle, 2
Is a frame of the motorcycle 1. This frame 2
Is a double cradle type having one main pipe 4 extending rearward and downward from the head pipe 3 at the center in the vehicle width direction. Reference numeral 5 is a front wheel, and 6 is a front fork that rotatably supports the front wheel 5. The front fork 6 is rotatably supported by the head pipe 3.

Reference numeral 7 is a rear wheel, and 8 is a rear arm for rotatably supporting the rear wheel 7. The rear arm 8 is supported by the frame 2 via a pivot shaft 9 so as to be vertically swingable.
10 is the engine of this motorcycle 1, this engine 1
Reference numeral 0 denotes an air-cooled 4-cycle single cylinder, which is supported by the frame 2. The spark plug of the engine 10 is arranged on the right side of the cylinder 11 in the vehicle body. This spark plug is designated by reference numeral 12 in FIG.

Reference numeral 13 is a fuel tank, and 14 is a seat.
The fuel tank 13 is a fuel tank main body 15 formed in a substantially vertical gate shape so as to straddle the main pipe 4 from above.
And a collar member 16 and the like attached to the lower portion of the fuel tank body 15.

The fuel tank body 15 includes an upper plate member 15a bent so as to be convex upward, and the upper plate member 1
It is formed by a lower plate member 15b that is welded to 5a and closes a lower opening of the upper plate member 15a, and an oil supply port is opened at a central portion of the upper plate member 15a in the vehicle width direction. The fuel cap 17 attached to the upper plate member 15a opens and closes the fuel filler port. The positions of the fuel filler port and the fuel cap 17 are set just above the cylinder 11 when the motorcycle 1 is viewed from the side as shown in FIG.

As shown in FIG. 3, the connecting portion between the upper plate member 15a and the lower plate member 15b has a structure in which the flange portions, which are the lower edge portions of the upper plate member 15a and the lower plate member 15b, are overlapped and welded over the entire circumference to maintain liquid tightness. ing. A connecting portion between the upper plate member 15a and the lower plate member 15b is indicated by reference numeral 15c in the drawing. The connecting portion 15c is located at the lowest position on the left and right sides of the fuel tank main body 15 formed in a substantially gate-shaped cross section. That is, the lowermost edges on the left and right sides of the fuel tank body 15 are the connecting portions 15c.

The collar member 16 is formed of a flexible vinyl chloride in the form of a slender plate, and the fuel tank body 1
It is affixed to the bottom of the left and right sides of 5. This collar member 16
The longitudinal dimension of the cylinder 11 is, as shown in FIG.
It is set longer than the length of the vehicle body in the front-rear direction. Here, the structure of the collar member 16 will be described in detail.

As shown in FIG. 3, the collar member 16 has a base portion 16a attached to the lower surface of the lower plate member 15b with an adhesive tape (not shown) or the like, and an extension extending from the base portion 16a toward the outer side in the vehicle width direction. It is formed in a plate shape including the projecting portion 16b and is attached to the fuel tank body 15 along the lower edge of the fuel tank body 15 as shown in FIGS. Further, the flange members 16 are disposed on both the left and right sides of the fuel tank body 15, and the attachment positions thereof are the engine 10
At a position corresponding to the cylinder 11 of the upper plate member 15
It is located inside the vehicle body with respect to the connecting portion 15c between the a and the lower plate member 15b.

The extending portion 16b is formed so as to gradually extend outward in the vehicle width direction as it extends downward, and it is formed so as to become gradually thinner as it moves away from the base portion 16a. The extension dimension of the extension 16b is set such that the extension end on the vehicle width direction outer side is located inside the vehicle body with respect to the outermost surface of the fuel tank body 15 in plan view. The portion of the fuel tank body 15 that is the outermost surface is indicated by reference numeral 13a in FIG. When the flange member 16 thus formed is attached to the fuel tank main body 15, the cylinder 11 and the spark plug 12 of the engine 10 are attached.
The extension end can be positioned further outward in the vehicle width direction.

The fuel tank 13 constructed as described above
In the motorcycle 1 equipped with the fuel tank 13, if the fuel overflows from the fuel filling port and is spilled when refueling the fuel tank 13, the spilled fuel is supplied to the fuel tank main body 15 as indicated by G _{1 to} G ₅ in FIG. And, it is dripped laterally of the cylinder 11 along the flange member 16. That is, the spilled fuel is mainly discharged from the fuel tank main body 15 as indicated by G ₁ on the upper surface of the fuel tank main body 15.
Of the fuel tank body 15 and flows down along the side surface of the fuel tank body 15 as indicated by G ₂ and G ₃ .

Then, from the lowermost portion of the side surface, the collar member 16
To the extension end 16b, and flows on the extension part 16b toward the extension end as indicated by G ₄ . After flowing to this extension end, G
_As shown by ₅ , it will be dripped downward from the extension end.

Therefore, the fuel flowing down along the side surface of the fuel tank main body 15 is dropped from the extended end of the flange member 16 through the flange member 16 from the lower edge of the fuel tank main body 15. For this reason, the substantial width of the bottom of the tank is equal to that of the collar member 16.
As a result, the fuel is dropped on the side of the cylinder 11.

If the extending portion 16b of the collar member 16 is inclined, the fuel can be surely guided to the side of the cylinder 11 regardless of the amount of fuel spilled from the fuel supply port. Further, the extending portion 16b has an extending end whose end is the fuel tank main body 15.
Since it is formed so as to be located inward of the vehicle body with respect to the outermost surface in plan view, the extending portion 16b does not unnecessarily project and does not interfere. Moreover, it does not spoil the appearance.

Further, as shown in this embodiment, the collar member 16 is used.
When vinyl chloride is formed from vinyl chloride, vinyl chloride has excellent heat resistance and is unlikely to be discolored or deformed, so that there is an advantage that the initial state can be maintained as long as possible.

[0021]

As described above, in the fuel tank for a motorcycle according to the present invention, a flange member is attached to the lower edge of the fuel tank main body so as to gradually extend outward in the vehicle width direction as it extends downward. Is formed so that the extending end on the outer side in the vehicle width direction is located inside the vehicle body from the outermost surface of the fuel tank main body in plan view. It is dripped from the extended end of the flange member along the flange member from the edge portion.

Therefore, since the substantial width of the lowermost portion of the tank is widened by the flange member, the fuel overflowing from the fuel tank drops to the side of the cylinder and is unlikely to adhere to the cylinder. Therefore, it is possible to prevent the engine from being contaminated by the fuel.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle equipped with a fuel tank according to the present invention.

FIG. 2 is a side view showing an enlarged main part of the present invention.

3 is a sectional view taken along line III-III of the lower portion of the fuel tank in FIG.

[Explanation of symbols]

 10 Engine 11 Cylinder 13 Fuel Tank 15 Fuel Tank Main Body 16 Collar Member 16b Extension Part

Claims (1)

[Claims] 1. A motorcycle in which a fuel tank having a lower edge portion located inside of a vehicle width direction is arranged in front of a seat and above an engine, in a lower edge portion of a fuel tank main body. According to the above, a flange member that gradually extends outward in the vehicle width direction is attached, and the flange member is formed so that the extension end on the vehicle width direction outer side is located inside the vehicle body from the outermost surface of the fuel tank body in plan view. A fuel tank for motorcycles that has been characterized.