JPH0825495B2 - Motorcycle fuel tank structure - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a fuel tank structure for a motorcycle.

[Prior art]

In some motorcycles, a plurality of fuel tanks are arranged in front of and behind the vehicle body so that the motorcycle can be driven over a long distance without refueling. In this case, the front tank and the rear tank are arranged so that the upper end of the rear tank is lower than the upper end of the front tank from the viewpoint of the body structure of the motorcycle.
A fuel inlet is provided on the front tank side, and the two tanks are connected by a pipe or the like so that the fuel can be moved.

However, in the above-described fuel tank having a plurality of structures, although the capacity is large, there is a problem that refueling takes a very long time because the fuel inlet is provided only in the front tank. Further, there is a problem that the structure becomes complicated because a plurality of tanks must be connected by a pipe for fuel distribution.

[Object of the Invention]

An object of the present invention is to provide a fuel tank structure for a motorcycle, which has a large-capacity multi-tank structure, can refuel quickly, and does not require a fuel distribution pipe.

[Structure of Invention]

The present invention that achieves the above object is a motorcycle in which a front tank and a rear tank are arranged in front of and behind a vehicle body so that an upper end of the rear tank is lower than an upper end of the front tank, and the rear tank is arranged below a seat. After that, the inside of the tank is divided into three tank chambers by a pair of left and right partition walls connected to the lower part of the seat and both upper and lower wall surfaces, and a communication hole is provided in this partition wall, and the seat is directly attached to the upper surface of the rear tank. The front and rear tanks are independently configured so that there is no fuel flow between them, and each tank is provided with a fuel inlet and a fuel outlet, and the fuel inlets of the rear tanks are provided in the outer left and right tank chambers, respectively. It is characterized in that the fuel passage connected to the fuel outlet is gathered into one hose and connected to the fuel pump.

〔Example〕

 Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings.

In the off-road motorcycle shown in FIG. 1, reference numeral 1 is a vehicle body frame, and 2 is an engine mounted on the vehicle body frame 1. As a fuel tank, a front tank 3 of a main tank and a rear tank 4 of an auxiliary tank are attached to the vehicle body frame 1 in the front-rear direction and independently so that the upper end of the rear tank 4 is lower than the upper end of the front tank 3. Front tank 3
Is provided so as to straddle the main pipe 5 of the vehicle body frame 1 from side to side, and the rear tank 4 has a support 6a and a rear frame 6 extending from the main pipe 5 and the rear frame 6, respectively, on the upper and lower surfaces on the front side thereof. It is connected and supported by a support 6b extending from. The seat 7 is attached so as to be directly supported on the upper surface of the rear tank 4 supported in this way, and the space between the rear tank and the seat 7 is used as a tank capacity by having such a direct support structure. However, the capacity of the rear tank 4 is made as large as possible.

As shown in FIG. 2, the front tank 3 is composed of two left and right independent left and right tanks 3a and 3b, and fuel inlets 9 and 9 with caps 8 and 8 are provided on the upper end surfaces of the left and right tanks 3a and 3b. There is. Further, a breather hose 10 is attached to these caps 8 to connect the inside and the outside. The breather hose 10 has only to be provided at the highest position in the front tank 3 and is not necessarily the cap 8 as in this embodiment.
Need not be provided.

In addition, the rear tank 4 has an escape space 14 formed in the central portion on the rear side so that the rear wheel 13 moving up and down does not interfere. The inside of the rear tank 4 is divided into three chambers of a right tank chamber 4a, a left tank chamber 4b, and a middle tank chamber 4c by a pair of left and right partition walls 11 and 12 which are connected to the upper and lower wall surfaces at the lower part of the seat, and the right tank chamber 4b is among them. The middle tank chamber 4c and the middle tank chamber 4c are in communication with each other through the communication holes 12a, 12a provided in the partition wall 12. In addition, the left and right tank chambers 4a, 4b are provided with caps 15, 15 on the high upper end surface on the rear side and on the portion without the seat 7, respectively.
Fuel injection ports 16 and 16 are provided, and the highest spaces thereof are communicated with each other by a communication pipe 17.
A breather hose 18 is connected to the communication pipe 17, and the breather hose 18 communicates with an upper part of the front tank 3 (right tank 3b) through a gap between the upper surface of the rear tank 4 and the seat 7.

Further, cocks 19 and 19 as fuel outlets are provided at the bottoms of the left tank 3a and the right tank 3b of the front tank 3, respectively. Further, cocks 20, 20 for fuel outlet are provided at the bottoms of the left tank chamber 4a and the right tank chamber 4b of the rear tank 4, respectively. Hose 21,21,22,22 for fuel supply is connected to these cocks 19,19,20,20, and these are one hose 23.
Are connected to the fuel pump 24. The fuel pump 24 is further connected to the carburetor 25.

According to the fuel tank of the motorcycle described above, since the seat is directly supported on the upper surface of the rear tank, the space between the rear tank and the seat is used for the tank capacity, and the tank capacity is expanded as much as possible. It is possible. In addition, even if the capacity is expanded by directly supporting the seat in the rear tank in this way, a pair of left and right partition walls connected to the upper and lower wall surfaces at the lower part of the seat is provided inside the tank. The tank capacity is not deformed even when a large load is applied, and the expansion of the tank capacity can be further facilitated.

In addition, although it has a large capacity due to the structure of multiple tanks provided at the front and rear, each of the front and rear tanks is an independent configuration without being connected by a fuel distribution pipe, etc.,
Since each has a fuel inlet,
Fuel can be replenished simultaneously from these fuel inlets. Therefore, a large amount of fuel can be replenished in a short time.

In addition, each of the tanks that are independent of each other has a fuel outlet, and the hoses connected to these fuel outlets are gathered into one hose and connected to the fuel pump, so that each tank independently supplies fuel. Can be supplied to the pump. Therefore, even if one of the plurality of tanks is damaged, the fuel supply can be continued without hindrance by closing the fuel outlet cock of the damaged tank, thereby minimizing damage caused by the damage. be able to.

Further, since the plurality of tanks are not connected to each other by the fuel distribution pipe as in the conventional case, the piping structure can be simplified.

Also, even if the motorcycle changes its posture, since the large capacity rear tank is divided into three chambers by the partition wall, there is no fuel movement between the tanks, and the balance of the motorcycle's posture can be lost. Few. Further, the partition wall between the right tank and the middle tank is provided with a communication hole, but the movement of the fuel through this communication hole is small, so that the above balance is less likely to be lost.

〔The invention's effect〕

As described above, the present invention includes a front tank and a rear tank,
In a motorcycle in which the upper end of the rear tank is lower than the upper end of the front tank, the rear tank is arranged below the seat, and then the inside of the tank is connected to the lower part of the seat and both upper and lower wall surfaces. It is divided into three tank chambers by a pair of left and right partition walls, a communication hole is provided in this partition wall, and the seat is directly supported by directly supporting it on the upper surface of the rear tank. It is used for the tank capacity, and it is possible to expand the tank capacity as much as possible.

In addition, even if the capacity is expanded by directly supporting the seat in the rear tank in this way, a pair of left and right partition walls connected to the upper and lower wall surfaces at the lower part of the seat is provided inside the tank. The tank capacity is not deformed even when a large load is applied, and the expansion of the tank capacity can be further facilitated.

Further, the front and rear tanks are configured independently of each other so that fuel does not flow through each other, each tank is provided with a fuel inlet and a fuel outlet, and the fuel inlets of the rear tanks are provided in the outer left and right tank chambers, respectively. The fuel passages connected to the outlets were gathered into one hose and connected to the fuel pump, so when refueling, it can be done simultaneously from the fuel inlets provided in each tank, so even with a large capacity it can be done in a short time. Can be refueled.

Also, even if one of the multiple tanks is damaged, the fuel supply can be continued simply by closing the cock of the fuel supply port of the damaged tank, so damage caused by damage should be minimized. You can Further, since the plurality of tanks are not connected to each other by the fuel distribution pipe as in the conventional case, the piping structure can be simplified.

Further, even if the posture of the motorcycle changes, the rear tank with a large capacity is divided into three chambers, so that fuel does not move between the tanks and the balance of the posture is less likely to be lost.

[Brief description of drawings]

FIG. 1 is a side view of a motorcycle having a fuel tank structure according to an embodiment of the present invention, FIG. 2 is a plan view showing only a fuel tank partially cut away, and FIG. III
FIG. 4 is a view on arrow IV-IV in FIG. 3 ... front tank, 4 ... rear tank, 8,15 ... cap,
9,16 …… Fuel inlet, 19,20 …… Cock (fuel outlet), 2
1,22,23 …… Hose, 24 …… Fuel pump, 25 …… Vaporizer.

Claims (2)

[Claims] 1. A motorcycle in which a front tank and a rear tank are arranged in front of and behind a vehicle body so that an upper end of the rear tank is lower than an upper end of the front tank, the rear tank is arranged below a seat, and then the inside of the tank is arranged. Is divided into three tank chambers by a pair of left and right partition walls connected to the upper and lower wall surfaces at the bottom of the seat, and a communication hole is provided in this partition wall, and the seat is directly supported on the upper surface of the rear tank, Both the front and rear tanks have an independent structure with no fuel flow between them, and each tank has a fuel inlet and a fuel outlet, and the fuel inlets of the rear tanks are provided in the outer left and right tank chambers and connected to each fuel outlet. A fuel tank structure for a motorcycle, characterized in that the fuel passages are connected to a fuel pump by collecting them into one hose. 2. A motorcycle according to claim 1, wherein a breather mechanism is provided at a cap of the fuel inlet of the front tank or at the highest position, and the upper portions of the front tank and the rear tank are connected by a breather hose. Fuel tank structure.