JPS6211751Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to the structure of a fuel tank attached to the fuel filler port of a gasoline tank or oil tank to which a closed tank cap is applied.

Prior Art and its Problems In fuel tanks used in motorcycles and the like, a fuel cylinder is often attached to the fuel filler port to regulate the liquid level when refueling.

That is, in the fuel filler port 02 of the fuel tank 01,
If a relatively long refueling cylinder 03 is attached, the liquid level will rise as refueling occurs and when it reaches the level of the lower end 04 of the refueling cylinder 03, there will be no place for the gas in the space A to escape, and subsequent refueling will be difficult. It becomes impossible to do so. In other words, by appropriately selecting the length of the oil supply tube 03, the oil supply level can be determined.

However, if the escape path of the gas in the space A is completely cut off, a tank cap is attached and the temperature changes and
Alternatively, when the internal pressure in the space A increases due to vibrations or the like during operation, the liquid level in the inner space B of the oil supply cylinder 03 increases.

In order to prevent this liquid level from rising, in the oil supply cylinder 03, an orifice 05 is provided at the upper part of the oil supply cylinder 03, so that the gas in the space A can freely escape to the space B side. In addition, the size of the orifice 05 is such that the speed of ventilation passing from the space A to the space B side through the orifice 05 is relatively large compared to the normal oil supply speed in order to maintain the oil supply level regulating effect of the oil supply pipe 03. The area is set to be smaller.

Furthermore, even if the orifice 05 is provided,
If the fuel tank 1 is a closed type, if the liquid level has reached the lower end 04 level of the fuel cylinder 03 or higher and the internal pressure has increased, the gas in the space A will instantly flow into the space B when the tank cap is opened. There is a risk that the fuel in the fuel supply cylinder 03 will be pushed up as the fuel tries to escape to the side. Note that at this time, since the opening area of the orifice 05 is sufficiently small, it cannot cope with the instantaneous pressure difference that occurs between the spaces A and B.

Therefore, normally, a breather passage is attached to the tank cap to prevent the pressure inside the fuel tank from increasing.

However, in certain models of motorcycles,
Some tanks use a closed tank cap without a breather passage, have a separate breather passage, release the internal pressure through a valve linked to the fuel tank, and have a relief valve attached to the breather passage.

In this type, when the fuel tank is turned off and the valve in the breather passage is turned off, the fuel tank is sealed and the pressure inside the fuel tank can rise below the set pressure of the relief valve.

In view of these circumstances, the present invention is an improvement to the structure of the filler cylinder of the fuel tank.The purpose of this invention is to make it possible to regulate the liquid level during refueling.
Another object of the present invention is to provide an oil supply cylinder with a simple structure in which the oil stored in the oil supply cylinder does not push up.

Embodiment Hereinafter, an embodiment of the present invention shown in FIGS. 2 to 5 will be described.

A relatively long fuel cylinder main body 3 is attached to the fuel filler port 2 of the fuel tank 1, and a cylindrical valve body 6 is slidably and rotatably disposed in contact with the inner peripheral wall surface of the fuel cylinder main body 3. (See Figure 3).

The oil supply cylinder main body 3 has a pair of main vents 4 having a relatively large area 180 degrees opposite each other in the upper part of the peripheral wall, and an inward shelf-shaped bent part 5 at the lower end. The valve body 6 is tightly fitted into the oil supply cylinder main body 3 and supported by the bent part 5, and a small area sub-vent 7 is provided at a height position corresponding to the main vent 4 in the oil supply cylinder main body 3. , and two sets of sub-vents 8 having a relatively large area adjacent to the sub-vents 7 are opened at positions 180 degrees opposite to each other. In addition, a pair of notches 9 are provided on the upper edge of the valve body 6 at 180 degrees opposite positions.
is formed.

Next, the functions and effects of this embodiment will be explained.

4 and 5 are exploded views of the valve body 6. The valve body 6 slides and rotates within the oil supply cylinder main body 3 as the tank cap 10 opens and closes. The positional relationship between the opening 4 and the sub-vents 7 and 8 is conceptually shown.

That is, when attaching the tank cap 10 to the filler port 2 of the fuel tank 1, align the spring plate protrusion 11 with the notch 1a formed in the same section and push the tank cap 10. The spring plate protrusion 11 and the notch 9 of the valve body 6 engage with each other. Next, when the tank cap 10 is rotated in the rightward screw direction, the valve body 6 also rotates together, and each pair of main vents 4 and sub-vents 8 match at the stop position (as shown in Figures 2 to 4). (see figure).

In this state, even if the liquid level (level L)
Even if the tank cap 10 is opened when the tank cap 10 reaches the bent part 5 of the fuel cylinder main body 3 and the internal pressure of the fuel tank 1 is rising, at the moment of opening, the gas in the space A will flow through the large area of the main vent. Port 4, sub-vent 8
Escape to space B side via . Therefore, when the tank cap is opened, the fuel located in the filler cylinder body 3 will not be pushed upward by the gas in the space A.

When opening the tank cap 10, the tank cap 10 is rotated in the opposite direction from when it was installed, but as the tank cap 10 is rotated, the valve body 6
The tank cap 10 is also rotated, and in the open position of the tank cap 10, the main vent 4 and the small area sub-vent 7 coincide (see FIG. 5).

In this state, the space A and the space B are communicated only through the small-area sub-vent 7, so when the liquid level reaches the bent part 5 of the fuel cylinder main body 3 during fuel injection, the fuel cylinder main body 3 Due to the liquid level regulating effect, it becomes impossible to perform subsequent refueling (that is, only the liquid level in the refueling tube 3 rises rapidly).

According to this embodiment, as described above, when the tank cap 10 is opened and closed, the valve body 6 inside the fuel supply cylinder body 3 slides and rotates, and the communication area of the main vent 4 changes accordingly. Therefore, even if the tank cap 10 is of a closed type, there is no fear that the fuel will be pushed up in the fuel cylinder main body 3 when the internal pressure increases, and the liquid level is effectively regulated during refueling.

Although the valve body 6 in the above embodiment is of a sliding and rotating type, substantially the same effect can be obtained by using a vertically moving valve body as shown in FIGS. 6 to 8. .

That is, a cylindrical valve body 26 having a small-area sub-vent 27 is fitted inside the oil supply cylinder main body 23 via a compression coil spring S so as to be slidable in the vertical direction.

This valve body 26 is formed to be shorter than the oil supply cylinder main body 23, and when the tank cap 10 is closed, the upper end edge of the valve body 26 is pushed down by the spring plate protrusion 11, and the space A and the space B is communicated with by the main vent 24 which is fully open (see FIG. 7). Therefore, even if the liquid level is at L and the tank cap 10 is opened when the internal pressure rises, the gas in the space A is momentarily released to the space B side, and the fuel in the fuel cylinder 23 is It won't be pushed up.

With tank cap 10 removed,
The valve body 26 is moved upward by the elastic force of the spring S, and the small-area sub-vent port 27 corresponds to the main vent port 24 (see FIG. 8). Therefore, the liquid level is effectively regulated by the oil supply tube 23 during refueling.

Effects of the Invention As is clear from the description of each embodiment, in the present invention, the movable valve (1) has at least a sub-vent of a small area formed in the main body of the oil filler cylinder in which a main vent of a large area is formed. (corresponds to the valve body 6, 26)
is slidably inserted into the tank cap, and the relationship between the main vent and the sub vent changes as the tank cap is opened and closed, reducing the opening area of the main vent when refueling, and Since the opening area of the vent is designed to be large, even when using a tank cap that does not have a breather passage, there is no risk of the oil stored inside the oil filler cylinder being pushed up, and the liquid level due to the fuel filler vent body is Regulation will also be effective.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of a known fuel tank, Fig. 2 is an exploded explanatory view of a fuel tank to which a fuel tank is attached according to an embodiment of the present invention, and Fig. 3 shows a tank cap attached to the fuel tank. FIGS. 4 and 5 are explanatory diagrams showing the operating mode of the fuel tube according to another embodiment of the present invention, and FIG. The exploded explanatory view of the tank, FIGS. 7 and 8, are vertical cross-sectional views showing the operating mode of the oil supply cylinder. 1... Fuel tank, 1a... Notch, 2... Fuel filler port, 3... Fuel filler cylinder body, 4... Main vent, 5...
...Bent part, 6...Valve body, 7, 8...Sub-vent, 9
...Notch, 10...Tank cap, 11...
...Spring plate protrusion, 23...Oil supply cylinder body, 24...Main vent, 26...Valve body, 27...Sub vent, S...
…spring.

Claims (1)

[Scope of Claim for Utility Model Registration] In a fuel filler cylinder of a fuel tank that is opened and closed by a tank cap, the main body of the fuel filler cylinder has a main vent with a large area formed in the peripheral wall, and the main body of the fuel filler cylinder is The tank cap is slidably held along the inner wall, and the cylindrical moving valve has at least a small area sub-vent formed in the peripheral wall. When the tank cap is open, the small-area secondary vent of the cylindrical transfer valve corresponds to the main vent of the filler tube body, and when the tank cap is closed, the main vent of the filler tube body corresponds to the main vent of the filler tube body. A fuel tank filler cylinder characterized by a structure in which the mouth is fully open.