JPH06255554A - Roll-over valve fitting device to fuel tank for motorcycle - Google Patents

Abstract

PURPOSE:To reduce fuel entering a canister chamber by fitting a roll-over valve to a fuel tank so as to shorten the length of a recovery pipe to the roll- over valve. CONSTITUTION:A recessed part 5 is formed on one side of an inverted U-shape recession 4 at the center of the inner plate 2 of a fuel tank 1, and a roll-over valve 9 is fitted into the recessed part 5 to connect a recovery pipe 8 to a recovery hose 13. A recessed part 5 is formed also on one side of the outer plate 3 of the fuel tank 1, and a roll-over valve 9 is fitted into the recessed part 5 to connect the recovery pipe 8 to the recovery hose 13. A cover is then fitted to cover the outside of the recessed part 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rollover valve mounting device for a fuel tank for a motorcycle.

[0002]

2. Description of the Related Art Motorcycles are designed to run using gasoline as fuel in a fuel tank. Gasoline, which is a fuel, has a good vaporization property and produces a vapor (hydrocarbon), which is unsatisfactory. Therefore, a gas-liquid separation chamber is provided at the upper end in the fuel tank, a recovery pipe is inserted, and the vaporized fuel is guided from the recovery pipe to the canister chamber via the recovery hose.
It is adsorbed on the activated carbon in the canister room. The evaporative air adsorbed in the canister chamber is connected to the intake pipe of the engine by a hose so as to be sucked into the intake air and burned in the engine to prevent the evaporative air from leaking to the outside.

In a motorcycle, front and rear two wheels are allowed to travel in a balanced manner. If the balance is unbalanced, the motorcycle will overturn. When it rolls over, the fuel tank also falls over and liquid fuel flows into the recovery pipe. Therefore, a rollover valve is installed between the recovery pipe and the recovery hose to prevent the fuel from flowing into the canister chamber and prevent the canister chamber from overflowing by closing the rollover valve when it falls.

[0004]

Even if the rollover valve is closed when it rolls over, the liquid fuel flows from the gas-liquid separation chamber into the recovery pipe, and the fuel flows to the rollover valve. Then, even if the motorcycle is raised, the fuel once entering the recovery pipe does not return to the fuel tank. The rollover valve is attached to the frame, the recovery pipe is long, and a large amount of fuel flows into the canister chamber, which is unsatisfactory.

In view of the above point, the present invention is a fuel tank for a motorcycle, in which a rollover valve is attached to a fuel tank, the length of the recovery pipe to the rollover valve can be shortened, and the amount of fuel entering the canister chamber can be reduced. The purpose of the present invention is to obtain a rollover valve mounting device.

[0006]

In order to achieve the above object, a rollover valve mounting device for a fuel tank for a motorcycle according to the present invention has a concave U-shaped recess at the center of the inner plate of the fuel tank. That is, a portion is formed, a rollover valve is attached to the concave portion, and the recovery pipe and the recovery hose are connected to each other. Further, a recess is formed on one side of the outer plate of the fuel tank, a rollover valve is attached in the recess, the recovery pipe and the recovery hose are connected, and a cover is attached to the outside of the recess. Especially.

[0007]

Since the rollover valve is installed in the recessed portion provided in the inner plate or outer plate of the fuel tank, the rollover valve is connected to the rollover valve from the upper end of the recovery pipe inserted into the gas-liquid separation chamber at the inner upper end of the fuel tank. The length of the recovery pipe can be shortened. For this reason, when the overturned motorcycle is raised and restored, the fuel flowing into the canister chamber can be reduced and the overflow of the canister chamber can be prevented. Further, in the case where the outer plate of the fuel tank is provided with the recessed portion, the cover is attached, so that it can be prevented from hitting the rollover valve and the appearance is good.

[0008]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5 show an embodiment of the present invention. The fuel tank 1 is manufactured by welding the inner plate 2 and the outer plate 3 which are molded into a predetermined shape so as to fit in the middle, and is attached so as to straddle the front upper part of the frame. A recess 4 is provided vertically in the center of each of them in an inverted U-shaped cross section. A recess 5 is formed on one side of the recess 4 of the inner plate 2, and the mounting plate 6 is welded to the recess 5. A gas-liquid separation chamber 7 is provided at the inner upper end of the fuel tank 1, and an upper end of the recovery pipe 8 is inserted and opened. The lower end of the recovery pipe 8 is led out to the recess 5. A rollover valve 9 is fastened to the mounting plate 6 of the recess 5 using a set plate 10, and the upper end is connected to the recovery pipe 8. As shown in FIG. 4, the rollover valve 9 has a weight valve 12 supported by a spring 11 slidably inserted therein. When the rollover valve 9 is laid sideways, the spring valve 11 pushes the weight valve 12 to the inlet to close it. It has become. As shown in FIG. 5, the rollover valve 9 has a lower end connected to a recovery hose 13 and a canister chamber 14 containing activated carbon. Further, the canister chamber 14 is connected to an intake pipe 16 of the engine or a carburetor 17 by a purge hose 15.

Normally, the vaporized gas generated in the fuel tank 1 flows into the recovery pipe 8 in the gas-liquid separation chamber 7,
It enters the canister chamber 14 from the rollover valve 9 through the recovery hose 13 and is adsorbed by the activated carbon. Then, while the engine is operating, it is sucked together with the intake air by the purge hose 15 and included in the intake air and burned. When rolled over, the rollover valve 9 closes, but the fuel flows into the recovery pipe 8. Even when the vehicle is started, the fuel in the recovery pipe 8 cannot return to the fuel tank 1 and flows into the canister chamber 14. Since the rollover valve 9 is attached to the fuel tank 1 and the length of the recovery pipe 8 is short,
The amount of fuel accumulated in the recovery pipe 8 is small, and the canister chamber 1
It is possible to prevent the inside of 4 from overflowing.

FIG. 6 shows another embodiment of the present invention. In this case, the concave portion 5 is provided on one side of the outer plate 3 of the fuel tank 1, the mounting plate 6 is welded, and the rollover valve 9 is attached to the mounting plate 6.
To fasten. A cover 18 is attached to the recess 5 so as to cover the rollover valve 9. Others are the same as those shown in FIGS. 1 to 5.

[0011]

As described above, according to the present invention as described above, the rollover valve 9 can be mounted in the recessed portion 5 on one side of the inner plate 2 or the outer plate 3 of the fuel tank 1. The length of the recovery pipe 8 on the front side of the rollover valve 9 can be shortened, and when the recovery pipe 8 is rolled over,
The amount of fuel flowing in can be reduced. This can prevent the canister chamber 14 from overflowing and can reduce the size of the canister chamber 14. In addition, the concave portion 5 is formed in the outer plate 3.
When the cover 18 is provided, by covering the cover 18,
The rollover valve 9 can be prevented from hitting and the appearance can be improved.

[Brief description of drawings]

FIG. 1 is a side view of a fuel tank showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 showing an embodiment of the present invention.

FIG. 3 is a plan view of a fuel tank showing an embodiment of the present invention.

FIG. 4 is a vertical sectional view of a rollover valve showing an embodiment of the present invention.

FIG. 5 is a schematic view of an entire recovery device showing an embodiment of the present invention.

FIG. 6 is an exploded perspective view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Fuel Tank 2 Inner Plate 3 Outer Plate 4 Recess 5 Recessed Part 8 Recovery Pipe 9 Rollover Valve 13 Recovery Hose 18 Cover

Claims (2)

[Claims] 1. A recessed portion is formed on one side of an inverted U-shaped recess at the center of an inner plate of a fuel tank, and a rollover valve is attached to the recessed portion to connect a recovery pipe and a recovery hose. A fuel tank rollover valve mounting device for motorcycles. 2. A recessed portion is formed on one side of an outer plate of a fuel tank, a rollover valve is mounted in the recessed portion, a recovery pipe and a recovery hose are connected, and a cover is attached to the outside of the recessed portion. A rollover valve mounting device for a fuel tank for a motorcycle, which is characterized by the above.