JPH0631055B2 - Motorcycle fuel system - Google Patents

Description

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

[Technical Background of the Invention and Problems Thereof] Generally, in a motorcycle, fuel in a fuel tank is supplied to a carburetor through a fuel cock attached to the bottom of the fuel tank.

By the way, when this fuel cock is provided closer to the outer side in the width direction of the fuel tank due to the layout of the fuel tank and the engine, the fuel cock has a suction pipe extending upward for sucking the fuel in the fuel tank. Therefore, in particular, when the side wall of the tank is inclined inward as it goes upward, as in the nigrup portion at the rear of the fuel tank, there arises a problem that the suction pipe comes into contact with the side wall. As a result, there is a problem in that the fuel cock cannot be moved to the outside and the mounting position of the fuel cock is greatly restricted.

As a countermeasure against this, it is conceivable to shorten the total length of the suction pipe, but this makes it impossible to secure the reserve capacity of fuel, which is not suitable for practical use.

[Object of the Invention]

The present invention has been made based on such circumstances,
An object of the present invention is to provide a fuel system for a motorcycle, which can prevent contact between the fuel tank and the suction pipe and increase the degree of freedom in the mounting position of the fuel cock.

[Outline of Invention]

That is, the present invention, in order to achieve the above object, in a fuel device for a motorcycle, which is provided at a bottom portion of a fuel tank with a fuel cock located at an outer end portion in the width direction for taking out fuel in the fuel tank, The fuel cock includes a fuel suction pipe that extends upward into the fuel tank and has a main filter attached to a tip thereof, and a reserve sub-filter that is arranged side by side in the front-rear direction with respect to the fuel suction pipe. The pipe is bent inward in the width direction of the fuel tank at a position above the reserve sub-filter.

[Action]

According to the present invention, since the tip of the fuel suction pipe extending upward in the fuel tank is bent toward the inside of the fuel tank, the main filter attached to the tip of the suction pipe interferes with the side wall of the fuel tank. Never.

Also, when the fuel cock is attached to the bottom wall of the fuel tank, if the tip of the suction pipe is outward, it abuts the side wall of the fuel tank and cannot be attached. The reverse mounting of the fuel cock can be prevented.

Furthermore, since the suction pipe is bent toward the inside of the fuel tank above the reserve sub-filter, when attaching the fuel cock to the bottom wall of the fuel tank, tilt the fuel cock first and tilt the suction pipe. Insert the bent end of the fuel cell into the insertion hole formed in the bottom wall of the fuel tank, and if this bent end is inserted, straighten the fuel cock and straighten the suction pipe and the parallel with this. It is possible to insert the reserve sub-filters extending in the respective directions through the insertion holes, and it is possible to easily perform the insertion work without increasing the diameter of the insertion holes.

Example of Invention

The present invention will be described below based on an embodiment shown in the drawings.

In FIG. 1, reference numeral 1 is a frame, and a front head 3 is pivotally supported by a steering head pipe 2 at the front end of the frame. The left and right tank rails 4 and 4 extending rearward from the steering head pipe 2 and the left and right down tubes 5 and 5 extending rearward and downward are connected to each other via brackets 6 and 6. Between these brackets 6 and 6. The front end of the rear arm 7 is pivotally supported by the. A parallel four-cylinder engine 8 is mounted in a space portion surrounded by the tank rails 4 and 4 and the down tubes 5 and 5. On the rear surface of the cylinder 9 of the engine 8, four carburetors 10 ... Which are connected to each cylinder are arranged in parallel, and each carburetor 10 ...
Is connected to a rear box-shaped air cleaner 11.

Seat rails 12 and 12 extending rearward are connected in the middle of the tank rails 4 and 4, and on the tank rails 4 and 4 and the seat rails 12 and 12,
The fuel tank 13 and the seat 14 are installed in this order.

The fuel tank 13 has a tank bottom plate 15 forming the bottom surface thereof.
Is the engine 8, the carburetor 10 ... And the air cleaner 1
1, the left and right side walls 16, 16 of the fuel tank 13 are swung inward in the width direction so that the driver can easily grip his knees at the knee grip portion 13a at the rear of the fuel tank 13. As shown in FIG. 4, as it goes upward, it is inclined inward in the width direction. And the tank bottom plate 15 corresponding to the knee grip portion 13a
The fuel tank 13 at a position offset outward in the width direction.
Fuel cock 1 for supplying the internal fuel to the carburetor 10 ...
7 is attached, and the fuel cock 17 is located just on one side of the air cleaner 11.

The fuel cock 17, as shown in FIG.
3 has a body 18 liquid-tightly attached to the tank bottom plate 15 and a fuel supply passage 19 in the body 18 can be opened, reserved and switched to a primary position by a lever 20. The outlet of the fuel supply passage 19 is opened and closed by a valve body 22 supported by the diaphragms 21 and 21, and the negative pressure introducing chamber 2 on one side of the diaphragms 21 and 21 is opened.
When an intake negative pressure due to the engine driving acts on 3, the diaphragms 21 and 21 are bent to open the valve body 22, and the fuel supply passage 19 and the float chamber of the carburetor 10 are communicated with each other. .

On the upper end surface of the body 18, a fuel suction pipe 24 extending upward toward the inside of the fuel tank 13 and a reserve sub-filter 25 are projectingly provided, and the fuel suction pipe 24 and the sub-filter 25 are provided on the frame 1. The sub-filters 25 are arranged side by side along the front-rear direction, and the sub-filter 25 is arranged on the lower side of the bottom surface of the fuel tank 13. With the sub-filter 25, the fuel suction pipe 24 is the fuel tank 13
A protrusion length l inward is formed to be long, and a main filter 26 is attached to a tip portion thereof. And fuel suction pipe 2
4 and the sub filter 25 are connected to the fuel supply path 19, and when the lever 20 is switched to the open position, the engine 8
When the fuel tank 13 is driven, the fuel in the fuel tank 13 is supplied from the fuel suction pipe 24 to the carburetors 10 through the fuel supply passage 19, and the lever 20 is switched to the reserve position.
The fuel is supplied from the sub filter 25 to the carburetors 10 through the fuel supply passage 19.

The fuel suction pipe 24 of the fuel cock 17 is bent from the middle toward the inner side in the width direction of the fuel tank 13 by a predetermined angle θ as shown in FIG. 3 and FIG. The filter 26 is away from the side wall 16 of the fuel tank 13. In this case, the fuel suction pipe 24
Is bent toward the inner side in the width direction of the fuel tank 13 at a position higher than the adjacent sub-filters 25, that is, at a higher position. Therefore, the root of the fuel suction pipe 24 is at the base of the sub-filters 2.
It is straight so that it is parallel to 5.

According to such a configuration, the fuel suction pipe 24 extending upward toward the inside of the fuel tank 13 is bent inward in the width direction of the fuel tank 13, so that the knee grip portion 13a at the rear portion of the fuel tank 13 is formed. In addition, even if the side wall 16 is inclined inward in the width direction as the side wall 16 moves upward, a sufficient clearance can be secured between the side wall 16 and the side wall 16 of the fuel tank 13. Therefore, the main filter 26 attached to the tip of the fuel suction pipe 24 does not interfere with the side wall 16 of the fuel tank 13.

In the case of the above configuration, when the fuel cock 17 is attached to the bottom wall of the fuel tank 13, if the tip of the fuel suction pipe 25 faces outward, it abuts the side wall 16 of the fuel tank 13 and cannot be attached. When the tip of the suction pipe 24 is directed inward, there is no interference so that the fuel cock 17 can be attached, which prevents the fuel cock 17 from being reversed.

Further, the fuel suction pipe 24 is connected to the reserve sub-filter 2
5 is bent toward the inside of the fuel tank 13 at a position above the tip of the fuel tank 5, the fuel cock 17 is first tilted when the fuel cock 17 is attached to the bottom wall of the fuel tank 13, and the suction pipe is held in this position. Insert the bent end portion of 24 into the insertion hole formed in the bottom wall of the fuel tank 13, and if this bent end portion is inserted, straighten the posture of the fuel cock 17,
By doing so, the straight root portion of the fuel suction pipe 24 and the reserve sub-filter 25 extending in parallel with the fuel suction pipe 24 face the respective insertion holes in the same orientation, so that both of them can be inserted simultaneously. On the other hand, for example, when the fuel suction pipe 24 is bent toward the inside of the fuel tank 13 at the root, the extending direction of the fuel suction pipe 24 and the extending direction of the reserve sub-filter 25 are different from each other, so If they are inserted into their respective insertion holes at the same time, they must interfere with each other and the insertion holes must be enlarged. However, when the fuel suction pipe 24 is bent inward above the tip of the reserve sub-filter 25 as described above, the insertion work can be performed as described above, and the work is easy, and the insertion hole is specially formed. There is also an advantage that it is not necessary to form a large size.

Therefore, since the fuel suction pipe 24 does not come into contact with the fuel tank 13, the flexibility of the mounting position in the width direction of the fuel tank 13 is increased when mounting the fuel cock 17. Further, as a result, the entire fuel cock 17 is replaced by the fuel tank 1.
3, the fuel suction pipe 24 and the reserve sub-filter 25 are arranged side by side in the front-back direction of the frame 1. In this respect also, the fuel cock 17 is also connected to the outer end of the fuel tank 13. Since the air cleaner 11 can be placed closer to the portion, the degree of freedom in the shape and the mounting location of the air cleaner 11 can be increased, and the capacity of the air cleaner 11 can be increased.

Although the fuel cock is arranged on the side of the air cleaner in the above-described embodiment, it may be arranged on the side of the carburetor, engine or other parts, and the fuel cock also utilizes the negative pressure in the intake passage. The fuel supply path is not limited to one that automatically opens and closes, but may be a manual one.

Further, the position of the fuel tank is not limited to above the engine, but may be below the seat, for example.

[Advantages of the Invention] According to the present invention as described in detail above, since the fuel suction pipe is bent toward the inside of the fuel tank, a sufficient clearance is secured between the fuel suction pipe and the side wall of the fuel tank. Therefore, even if the fuel cock is moved outward in the width direction of the fuel tank, the fuel suction pipe will not come into contact with the fuel tank. For this reason, the degree of freedom of the mounting position in the width direction of the fuel tank is increased as compared with the conventional fuel cock.

Also, when attaching the fuel cock to the bottom wall of the fuel tank, if the tip of the suction pipe is facing outward, it will not be able to be attached because it will contact the side wall of the fuel tank, so the tip of the suction pipe must be directed to the inside. Therefore, it is not necessary to reverse the fuel cock.

Further, since the fuel suction pipe is bent toward the inside of the fuel tank at a position above the reserve sub-filter, when the fuel cock is attached to the bottom wall of the fuel tank, the fuel cock is tilted and the suction pipe Insert the tip bent part into the insertion hole formed in the bottom wall of the fuel tank, and if this tip bent part is inserted, straighten the position of the fuel cock,
The straight root portion of the suction pipe and the reserve sub-filter extending in parallel with the suction pipe can be inserted into the insertion holes, respectively, and there is an advantage that the insertion work can be easily performed without increasing the diameter of the insertion holes.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a side view of a motorcycle, Fig. 2 is a partially sectional side view, Fig. 3 is a partially sectional plan view, and Fig. 4 is Fig. 2. It is sectional drawing which follows the IV-IV line. 13 ... Fuel tank, 17 ... Fuel cock, 24 ... Fuel suction pipe, 25 ... Sub filter, 26 ... Main filter.

Claims (1)

[Claims] 1. A fuel system for a motorcycle, comprising a fuel cock located at an outer end in the width direction at the bottom of the fuel tank for taking out fuel from the fuel tank, wherein the fuel cock is a fuel tank. A fuel suction pipe that extends upward inward and has a main filter attached to its tip, and a reserve sub-filter that is arranged side by side in the front-rear direction with respect to this fuel suction pipe, wherein the suction pipe is the reserve sub-filter. A fuel system for a motorcycle, characterized in that it is bent inward in the width direction of the fuel tank at a location above the filter.