JPH03224826A - Overflow device for excessive fuel supply - Google Patents

Abstract

PURPOSE:To prevent overflowing fuel from being splashed on an oiler and a vehicle body and the subsequent contamination thereof by extending a fuel passage for the overflowing fuel from a fuel tank and providing downward the outlet of the fuel passage on the inner surface of a fuel lid. CONSTITUTION:A fuel recovery valve 7 and a trap 11 opened and closed with a fuel supply gun 8 are laid on the upper end of a filler neck pipe 3 having a lower end continuous to a fuel tank 6. In this case, a three-way valve 20 is installed and the first fuel pipe 24 is extended from the lower part of the valve 20 to the upper part of the filler neck pipe 3 and in addition, the second fuel pipe 26 is extended from the upper part of the valve 20 to an accumulator 31 formed on the inner surface of a fuel lid 29. Similarly, the third fuel pipe 28 is extended from the aforesaid upper part to the canister 33. When fuel is supplied, the three-way valve 20 is selected and the fuel is made to flow only to the second fuel pipe 26. Thereafter, the fuel is made to flow down from the opening of the accumulator 31.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> This invention is applicable when an excessive amount of fuel is supplied to a tank due to a malfunction of the auto-stop of a fuel injection gun (referred to as "supercharging" in this specification). ), relates to an overflow device that releases overflowed fuel to the outside of the vehicle.

<Prior Art and Problems to be Solved by the Invention> - The fuel injection gun is strategically equipped with an auto-stop mechanism to prevent excess fuel from being supplied to the tank.

However, since the auto-stop mechanism may not operate normally, in reality, the refueling person has to constantly monitor the fuel injection status, which is complicated.

If this monitoring is neglected, fuel will overflow from the opening of the filler neck vibe into which the injection gun is inserted during superfueling. This could cause fuel to drip onto the body and discolor the exterior of the body.

In addition, in the type of filler neck pipe with a fuel recovery valve attached to the inner circumferential surface (Actual Opening 50-1
45922, JP-A No. 63-2723, etc.),
You can't see what's inside through the opening. Therefore, when the auto-stop mechanism of the injection gun malfunctions, the above problem is likely to occur.

<Means for Solving the Problems> The present invention is an overflow device made in view of the above problems, and has a configuration in which a fuel passage through which overflowed fuel flows extends from a vehicle fuel tank, The outlet of the passage is characterized in that it is attached downward to the inner surface of the fuel lid.

<Example> Hereinafter, this invention will be explained in more detail by way of an example.

The overflow device 1 of the embodiment includes a filler neck vibe 3, a fuel tank 6, a breather pipe 13, and a three-way valve 20.
．． Fuel pipes 24, 26, 28 and fuel lid 2
Consists of 9.

As shown in FIG. 3, the filler neck vibe 3 has its upper end fixed to the vehicle body 5, and its lower end communicates with the fuel tank 6. Reference numeral 8 in FIG. 3 is a fuel cap. A fuel recovery valve 7 is attached to the inner peripheral surface of the inlet of the filler neck vibe 3.

A trap 11 that is opened and closed by a fuel injection gun 9 is disposed behind the valve 7. This trap 11 also opens and closes the inlet of a first fuel vibe 24 that leads to a three-way valve 20, which will be described later.

The breather pipe 13 extends from the upper surface of the tank 6 and communicates with the back side of the filler neck vibe 3 from the part where the trap 11 is disposed. As a result, when not refueling (the trap 11 is blocking the two vibrators 3 and 24), the fuel paper is attached to the filler neck vibrator 3.
It is circulated into the tank 6 through the tank 6.

The three-way valve 20 includes a casing 21, a float valve 35, and a fuel liquid valve 41.

As shown in FIG. 5, the casing 21 has a large-diameter upper portion 21.
a and a smaller diameter lower portion 21b. A first fuel vibe 24 extends from the lower edge of the side wall of the lower portion 21b, and its lower end communicates with the filler neck vibe 3.

A second fuel pipe 26 extends from the side wall of the upper portion 21a and is connected to a box-shaped accumulator 31 formed on the inner surface of the fuel lid 29. The opening 33 of the accumulator 31 faces downward, as shown in FIG. A third fuel pipe 28 extends from the earthen wall of the upper portion 21a and is connected to the canister 33. In addition,
The third fuel pipe 28 passes through the upper wall and projects into the casing.

The float valve 35 is disposed within the lower portion 21b so as to be movable up and down. A compression coil spring 37 is interposed between the float valve 35 and the raised bottom wall so that the apparent specific gravity of the float valve 35 is smaller than the specific gravity of the fuel liquid.

The fuel liquid valve 41 has a ring-shaped rubber seal part 43.
and a retainer 45, the upper part 2 of the casing
It is disposed within 1a so as to be movable in the vertical direction. A rib 47 formed on the inner periphery of the seal portion 43 is connected to the float valve 3.
5 in close contact with the top surface. The rib 49 formed on the outer periphery of the seal portion 43 comes into close contact with the step portion 21c that connects the large diameter portion 21a and the small diameter portion 21b. This valve 41 is urged downward by a compression coil spring 51. A cylindrical portion 46 is formed on the inner periphery of the retainer 45, and is externally connected to the third fuel pipe 28 via an O-ring 53.

In the three-way valve 20, during normal oil supply, the float valve 35 is lowered as shown in FIG. 5, and its upper surface is separated from the rib 47. Therefore, the fuel paper moves from the first fuel vibe 24 to the casing 21 as shown by the arrow in the figure.
→ Communicate with the third fuel pipe 28. At this time, the rib 49 formed on the outer periphery of the seal portion 43 comes into close contact with the step portion 21c, and due to the presence of the O-ring 53 between the retainer 45 and the third fuel pipe 28, the fuel paper is attached to the second fuel pipe 28. It will not flow into.

On the other hand, during supercharging, the liquid fuel that has soaked into the casing 21 causes the float valve 35 to open as shown in FIG.
floats up, sealing the space between the inner peripheral rib 47 of the seal part 43 and the upper surface of the float valve 35, and at the same time, the seal part 43 is lifted by the pressure of oil supply and its outer peripheral rib 49 separates from the stepped part 21c. Thereby, the fuel liquid will flow only into the second fuel pipe 26. Therefore, it is possible to prevent the fuel liquid from flowing into the canister.

The fuel liquid that has flowed into the second fuel pipe 26 flows into the accumulator 31 of the fuel lid 29 and flows downward from the opening 33 thereof. The situation is shown in Figure 2. This allows the refueling person to detect abnormalities. When the fuel lid 29 is open, the opening 33 is located sufficiently outside the vehicle body 5. Therefore, the fuel liquid is no longer splashed onto the vehicle body 5.

Note that it is not preferable to form the opening 33 on the front or side surface of the accumulator because there is a risk that the fuel liquid will come into contact with the person filling the fuel. Of course, the outlet of the second fuel pipe 26 may be directed downward without forming an accumulator.

If the second fuel pipe 26 and/or the accumulator 31 are made of a transparent or translucent material, the fuel liquid can flow through the opening 33.
It is possible to know the flow of fuel liquid, that is, the superfueling state, before it starts flowing.

Note that FIGS. 7 and 8 show three-way valves 60 and 100 with other structures.

In the three-way valve 60 shown in FIG. 7, a ring-shaped partition 63 is fixed between the upper large-diameter portion 61a and the lower small-diameter portion 61b of the casing 61. A first seal portion 65 is fixed to the inner periphery of the partition 63. In addition, the partition 63
A through hole 67 is bored in the through hole 67, and a fuel liquid valve 69 is in close contact with the periphery of this through hole 670. The fuel liquid valve 69 is composed of a second seal portion 71 made of rubber, a retainer 73, and a compression coil spring 75.

In this embodiment, the apparent specific gravity of the float valve 77 is adjusted to be smaller than that of the fuel liquid by a compression coil spring 79.

The three-way valve 60 having such a configuration assumes the state shown in FIG. 7 in a normal refueling state, and the fuel paper is inserted into the first fuel
1→casing 61→third fuel vibe 83.

When the fuel liquid flows into the lower small diameter portion 61b of the casing 61 during supercharging, the float valve 7
7 floats up and closes the inlet of the third fuel vibe 83, and the fuel liquid valve 69 is pushed up. As a result, the lower small diameter portion 61a and the upper large diameter portion 61b of the casing 61 are communicated with each other, and the fuel liquid flows into the second fuel vibe 82.

The three-way valve 100 shown in FIG. 8 differs from the one shown in FIG. 7 in that the casing 101 has a substantially cylindrical shape, and a cylindrical partition 103 is disposed therein, and a first seal portion 105 for the float valve 77 is provided. and the shape of the fuel liquid valve 107 is modified.

This three-way valve 100 also has the same effect as that shown in FIG.

In the above embodiment, the breather pipe 13, the first fuel vibe 24, and the three-way valve 20%'! A fuel passage F is configured by the J2 fuel pipe 26. Of course, it is also possible to arrange the fuel passage completely independent of the passage for conveying fuel paper to the canister 33. In this case, the former passage is provided with a fuel cut-off valve that blocks the passage of fuel liquid and allows only fuel paper to pass (Utility Model Application Publication No. 1-91626).
(Refer to the publication answer). On the other hand, the latter passage is provided with a valve that opens and closes at a constant pressure.

<Operations and Effects of the Invention> As explained above, in the overflow device of the present invention, the outlet of the fuel passage extending from the fuel tank and through which overflowing fuel passes is attached downward on the inner surface of the fuel lid. Therefore, the fuel liquid that overflows during supercharging flows downward through the fuel passage. Therefore, it does not affect the refueling person.

Since the fuel lid that is opened during refueling protrudes outward from the vehicle body 5, almost no fuel flows out from the outlet of the fuel flow path attached to the inner surface of the fuel lid. Therefore, the vehicle body will not be discolored.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of an overflow device 1 according to an embodiment of the present invention, Fig. 2 is a front view showing the fuel lid 29, Fig. 3 is a perspective view thereof, and Fig. 4 is a line A-A in Fig. 3. 5 is a sectional view showing the three-way valve 20 in a normal refueling state, FIG. 6 is a sectional view showing the three-way valve 20 in supercharging, and FIG. 7.8 is a modified three-way valve 60, 100. FIG. DESCRIPTION OF SYMBOLS 1... Overflow device, 6... Fuel tank, 33... Opening part (outlet), F... Fuel flow path. Patent Applicant: Toyoda Gosei Co., Ltd. Isuy Automobile Co., Ltd. 1') AA- Figure 3-4 Figure 4

Claims (1)

[Claims] An overflow during supercharging, characterized in that a fuel passage through which overflowed fuel flows extends from a vehicle fuel tank, and an outlet of the fuel passage is attached downward to an inner surface of a fuel lid. Device.