JPH0729625B2 - Overflow fuel guide structure for fuel tanks for motorcycles - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fuel tank most suitable for a scooter type motorcycle or motorcycle, and in particular, it can guide fuel overflowing from a fuel filler to a predetermined position at the time of fueling or the like. Regarding the structure.

[Conventional technology]

Generally, in scooter type motorcycles and motorcycles, a fuel tank is mounted below the seat at the rear of the vehicle body. This fuel tank has a fuel filler port formed at the rear end to facilitate refueling work and climbs a slope. In this case, it is common to mount the fuel tank so that the rear part of the fuel tank is higher than the front part in order to prevent the oil level from being higher than the fuel filler port.

By the way, there is a case where fuel is accidentally overfilled during fueling and overflows, but in the case of a fuel tank mounted so that the rear part is higher as described above, this overflowed fuel flows forward along the tank surface. There is a fear. On the back side of the seat at the front of the fuel tank, you can store in-vehicle parts such as tools and documents.
In addition, since an air cleaner is generally installed in the lower front part, when the above-mentioned overflow fuel flows forward, there is a risk that documents and the like will be contaminated and the air cleaner will be clogged due to the adhesion of the fuel. There is.

Therefore, conventionally, for example, there is a structure shown in FIG. 5 as a structure for guiding the overflow fuel to the rear of the vehicle body. In the figure, 30 is a saucer having a guide opening 30a,
The guide port 30a is fitted and attached to the fuel filler port 31a of the fuel tank 31 so as to face the rear of the vehicle.

[Problems to be solved by the invention]

However, in the above-mentioned conventional structure, the receiving tray 30 is only fitted into the fuel filler port 31a and is not in close contact with the fuel tank 31, so there is a gap between the two. Therefore, overflow fuel may flow forward through this gap,
It cannot fully serve the purpose of guiding the overflow fuel to the rear of the tank.

In order to sufficiently fulfill the above purpose, in the case of a metal tank, the tray 30 may be welded to the tank body or integrally formed during press molding, and in the case of a resin tank, during resin molding. It may be integrally molded. However, with these methods, the number of man-hours is increased by the amount of the welding process, and since it is necessary to change the mold for press molding or resin molding, it is not possible to use an existing mold, and in any case However, the cost is rising.

Therefore, an object of the present invention is to solve the above conventional problems,
It is an object of the present invention to provide an overflow fuel guide structure for a fuel tank for a motorcycle, which is capable of preventing the overflow fuel from flowing forward and preventing stains on the seat back contents, the air cleaner, etc. without increasing the cost.

[Means for solving problems]

The present invention is directed to a motorcycle in which a seat support bracket is provided so as to straddle a fuel tank, an on-vehicle component is housed in the front of the seat support bracket, and an air cleaner suction port is located below the front portion of the seat support bracket. A fuel filler port is formed in the rear of the seat support bracket of the tank, and a dam member made of an elastic member is inserted between the seat support bracket and the upper surface of the fuel tank. This is a feature of an overflow fuel guide structure for fuel tanks for motorcycles and motorcycles.

[Action]

In the overflow fuel guide structure for a fuel tank for a motorcycle according to the present invention, the dam member made of an elastic member is arranged so as to be pressed to the front side of the fuel filler port on the upper surface of the fuel tank. The close contact of the fuel overflowing from the fuel supply port is blocked by the dam member at the rear position of the fuel tank, and the fuel falls downward. Therefore, it does not flow forward, and as a result, the problem of pollution due to overflowed fuel such as back container and air cleaner is solved.

Further, since the present invention has a structure in which the dam member is simply sandwiched by the conventionally provided seat support brackets, the present invention can be directly applied to a conventional fuel tank and can be used for welding a saucer or a mold as described above. There is no need to change it, and there is almost no cost increase.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 are views for explaining an overflow fuel guide structure of a fuel tank for a scooter type motorcycle according to an embodiment of the present invention. In the figure, 1 is a scooter type motorcycle to which the structure of the present embodiment is applied. A steering shaft cylinder 2d fixed to a front end portion of a vehicle body frame 2 of the motorcycle 1 has a front wheel 3 at its lower end, Front forks 4 that support the steering handles 4a at their upper ends are pivotally supported. Further, a swing type power unit 6 is provided at the substantially center of the body frame 2.
Is swingably pivoted up and down. This power unit 6
Is mainly a forced air cooling type engine 10, a carburetor 10a connected to the engine 10, an air cleaner 10b and the engine 10
Of the crankcase 10d, the rear case 8 is supported behind the transmission case 7, and the rear portion of the transmission case 7 is supported by the cushion unit 9 on the rear portion of the vehicle body frame 2. There is.

In addition, the rear left and right rear tubes of the body frame 2
Between the 2b and 2b, a gate-type seat support bracket 13,
14 and 15 are erected, and each of these support brackets 13 to 15
Damper members 16a to 16c fixed to the bottom plate of the seat 12 for two passengers are abutted and supported thereon, and the seat 12 is pivotally supported so as to be openable and closable laterally in the traveling direction. Further, a small article storage portion 19 for documents, tools, etc. is formed slightly behind the center damper member 16b on the bottom surface of the seat 12.
20 is a battery.

The fuel tank 17 is placed between the rear tubes 2b and 2b.
Is provided. This fuel tank 17 is made of steel plate, and is formed by mutually connecting outwardly integrally formed flange portions 17c at the peripheral edges of the openings of the upper tank portion 17 and the lower tank portion 17b. A fuel filler port 17e is formed at the end. The bolt holes 17d formed at the four corners of the flange 17c are fixed on the rear tube 2b by bolts 18a.
The rear upper surface is a little higher than the front when it is mounted on the vehicle body.

Then, a dam member 21 is inserted between the seat supporting bracket 15 at the rear end portion and the upper tank portion 17a, and is pressed by the supporting bracket 15. This dam member 21
Is a weir portion 21a formed in a substantially U shape along the surface shape of the upper tank portion 17a using an elastic member such as rubber, and a large number of ribs integrally projecting on the upper surface of the weir portion 21a. The weir rib 21c and the positioning rib 21d are integrally formed at the rear edge and the front edge of the weir portion 21a. The pressing rib 21b is pressed by the support bracket 15, whereby the dam portion 21a is in close contact with the surface of the upper tank portion 17a,
The weir rib 21c projects upward from the rear edge of the seat support bracket 15.

Next, the function and effect of this embodiment will be described.

First, the case of attaching the dam member 21 of the present embodiment will be described. The seat 12 is opened, and the fuel tank 17 is opened with the seat support brackets 14 and 15 at the center and the rear part removed.
Are placed between the rear tubes 2b, and the two rear portions of the flange portion 17c are fixed to the rear tube 2b by the mounting bolts 18a.
Seat support bracket in the center of the front two places
Then, the weir member 21a of the weir member 21 is fitted to the upper surface of the rear portion of the fuel tank 17, and the rear seat support bracket 15 is provided between the weir rib 21c and the positioning rib 21d of the weir member 21. After placing and aligning, bolts are fixed to the nut 2c fixed on the rear tube 2b. As a result, the dam member 21 is arranged in the front part of the fuel filler 17 on the upper surface of the fuel tank 17 so as to cross and closely contact the fuel filler 17e.

When the fuel overflows during refueling of the fuel tank 17 including the weir member 21, the overflow fuel is blocked from flowing forward by the weir member 21, and the fuel flows laterally along the weir member 21. As shown in FIG. 4, the fuel flows and falls downward along the side wall of the fuel tank 17.

As described above, in this embodiment, the dam member 21 is disposed in front of the fuel filling port 17e of the fuel tank 17, so that even if the fuel overflows during refueling, the flow in the front of the fuel tank 17 can be prevented, and as a result, It is possible to prevent stains on the back of the seat, the air cleaner, etc. due to the overflow fuel.

In addition, the dam member 21 of the present embodiment can be mounted by simply sandwiching it between the tank supporting surface and the tank support bracket 15 when mounting the tank, and the above-mentioned tray is welded to the fuel tank or integrally formed. There is no problem of cost increase as in the case.

In the above embodiment, the scooter type motorcycle has been described. However, the structure of the present invention is of course applicable to other types of motorcycle fuel tanks, and also to a scooter type motorcycle having one front wheel and two rear wheels. It can also be applied to fuel tanks for tricycles.

〔The invention's effect〕

As described above, according to the overflow fuel guide structure of the fuel tank for the motorcycle according to the present invention, the weir member is inserted between the seat support bracket and the fuel tank, and this is pressed by the support bracket. It is possible to prevent the overflow fuel from flowing to the front without increasing the cost,
It has the effect of preventing the air cleaner from becoming dirty.

[Brief description of drawings]

FIGS. 1 to 4 show an automatic system according to an embodiment of the present invention,
It is a figure for explaining the overflow fuel guide structure of the fuel tank for tricycles, and Drawing 1 is a partial section top view, Drawing 2,
FIG. 3 is a sectional view taken along the line II-II and a sectional view taken along the line III-III of FIG. 1, respectively, and FIG. 4 is a side view of a scooter type motorcycle to which the above-mentioned embodiment is applied, and FIG. b) is a plan view and a sectional view of a conventional overflow fuel guide structure. In the figure, 1 is a scooter type motorcycle, 9 is an air cleaner, 12 is a seat, 15 is a seat support bracket, 17 is a fuel tank, 17e is a fuel filler port, 19 is a small component (vehicle-mounted component) accommodating portion, and 21 is a weir member. is there.

Claims (1)

[Claims] 1. A gate-type seat support bracket for supporting a seat is arranged so as to straddle a fuel tank, and an in-vehicle component is housed in a space below the seat in front of the seat support bracket, and the seat support is provided. In a motorcycle with an air cleaner suction port located below the front of the bracket, a fuel filler port is formed on the upper surface of the fuel tank behind the seat support bracket, and between the seat support bracket and the upper surface of the fuel tank. A weir member made of an elastic member and having a length substantially the same as the width of the fuel tank, and the seat support bracket presses the weir member against the upper surface of the tank to bring them into close contact with each other. Tank overflow fuel guide structure.