JPH0829669B2 - Overflow device when overfilling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention is used when fuel is excessively supplied to a tank due to a failure of an auto stop of a fuel injection gun (this is referred to as “at the time of over-fueling”). ), And an overflow device that allows the overflowed fuel to escape to the outside of the vehicle.

<Problems to be Solved by Prior Art and Invention> Generally, a fuel injection gun is equipped with an auto stop mechanism to prevent excessive supply of fuel to a tank.

However, since the auto stop mechanism may not operate normally in some cases, in reality, the fueler has to constantly monitor the fuel injection situation, which is complicated.

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

In addition, for a filler net pipe of the type with a fuel recovery valve attached to the inner peripheral surface,
No. 922, Japanese Patent Laid-Open No. 63-2723, etc.), and the inside of it cannot be seen from the opening. Therefore, when the auto stop mechanism of the injection gun fails, the above problem is likely to occur.

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

<Example> Hereinafter, the present invention will be described in more detail with reference to an example.

The overflow device 1 of the embodiment includes a filler net 3, a fuel tank 6, a blister pipe 13, a three-way valve 20,
It consists of fuel pipes 24, 26, 28 and fuel lid 29.

As shown in FIG. 3, the filler net 3 has an upper end fixed to the vehicle body 5 and a lower end communicating 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 net 3. A trap 11 which is opened and closed by a fuel injection gun 9 is disposed behind the valve 7. The trap 11 also opens and closes the inlet of the first fuel pipe 24 leading to the three-way valve 20 described later.

The blizzer pipe 13 extends from the upper surface of the tank 6 and communicates with the interior of the filler net 3 from the portion where the trap 11 is disposed. As a result, the fuel vapor is circulated through the filler net pipe 3 into the tank 6 when fuel is not supplied (the trap 11 blocks the two pipes 3 and 24).

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 21a.
And a lower portion 21b having a small diameter. The first fuel pipe 24 extends from the lower edge of the side wall of the lower portion 21b, and the lower end thereof communicates with the filler net pipe 3. Upper part 21
The second fuel pipe 26 extends from the side wall of a, and is a box-shaped accumulator formed on the inner surface of the fuel lid 29.
It is connected to 31. The opening 33 of the accumulator 31 is
As shown in FIG. 4, it faces downward. The third fuel pipe 28 extends from the upper wall of the upper portion 21 a and is connected to the canister 33. The third fuel pipe 28 penetrates the upper wall and projects into the casing.

The float valve 35 is arranged in 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 that of the fuel liquid.

The fuel liquid valve 41 includes a ring-shaped rubber seal portion 43 and a retainer 45, and is arranged in the upper portion 21a of the casing so as to be vertically movable. The rib 47 formed on the inner circumference of the seal portion 43 is in close contact with the upper surface of the float valve 35. Ribs 49 formed on the outer periphery of the seal portion 43
Comes into close contact with a step portion 21c connecting the large diameter portion 21a and the small diameter portion 21b. The valve 41 is biased downward by a compression coil spring 51. A cylindrical portion 46 is formed on the inner circumference of the retainer 45 and is externally mounted on the third fuel pipe 28 via an O-ring 53.

In such a three-way valve 20, the float valve 35 descends as shown in FIG. 5 during normal refueling, and the upper surface thereof is separated from the rib 47. Therefore, the fuel vapor flows through the first fuel pipe 24 → the casing 21 → the third fuel pipe 28 as shown by the arrow in the figure. 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 the presence of the O-ring 53 between the retainer 45 and the third fuel pipe 28 causes the fuel vapor to move to the second fuel pipe 26. It doesn't flow into.

On the other hand, at the time of super refueling, the liquid fuel that has flowed into the casing 21 lifts the float valve 35 as shown in FIG. 6, and the clearance between the inner peripheral rib 47 of the seal portion 43 and the upper surface of the float valve 35 is increased. At the same time as being hermetically closed, the sealing portion 43 is lifted by the pressure of refueling, and the outer peripheral rib 49 thereof is a step
Move away from 21c. As a result, the fuel liquid becomes the second fuel pipe 2
It will only flow into 6. Therefore, it is possible to prevent the fuel liquid from flowing into the canister.

The fuel liquid flowing into the second fuel pipe 26 flows into the accumulator 31 of the fuel lid 29 and its opening
It flows down from 33. The state is shown in FIG. As a result, the refueling person can detect the abnormality. With the fuel lid 29 open, the opening 33 is the vehicle body 5.
Located farther out. Therefore, the fuel liquid does not reach the vehicle body 5.

Note that it is not preferable to form the opening 33 on the front surface or the side surface of the accumulator because the fuel liquid may splash on the fuel filler. Of course, the outlet of the second fuel pipe 26 may be directed downward as it is without forming the accumulator.

If the second fuel pipe 26 and / or the accumulator 31 are made of a transparent or translucent material, the flow of the fuel liquid, that is, the super-lubricated state can be known before the fuel liquid flows out from the opening 33.

7 and 8 show three-way valves 60/100 having other structures.

In the three-way valve 60 of FIG. 7, the upper large diameter portion of the casing 61
A ring-shaped partition 63 is fixed between 61a and the lower small-diameter portion 61b. The first seal portion 65 is provided on the inner circumference of the partition 63.
Has been fixed. Further, a through hole 67 is formed in the partition 63, and a fuel liquid valve 69 is provided to the peripheral edge of the through hole 67.
Are in close contact. The fuel liquid valve 69 includes a rubber second seal portion 71, 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 the fuel liquid by the compression coil spring 79.

In the three-way valve 60 having such a configuration, the state shown in FIG. 7 is set in the normal refueling state, and the fuel vapor is connected to the first fuel pipe 81.
-> Casing 61-> Third fuel pipe 83 is in communication.

When the fuel liquid flows into the lower small-diameter portion 61b of the casing 61 during supercharging, the float valve 77 floats up to close the inlet of the third fuel pipe 83 and push up the fuel liquid valve 69. To be This allows
In the casing 61, the lower small diameter portion 61a and the upper large diameter portion 6a
1b is communicated with, and the fuel liquid flows into the second fuel pipe 82.

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

This three-way valve 100 also has the same operation as that of FIG.

In the above embodiment, the blister pipe 13, the first fuel pipe
A fuel passage F is constituted by 24, the three-way valve 20, and the second fuel pipe 26. Of course, the fuel passage may be arranged completely independent of the passage for feeding the fuel vapor to the canister 33. In this case, the former passage is provided with a fuel cut-off valve that blocks the passage of the fuel liquid and passes only the fuel vapor (see Japanese Utility Model Laid-Open No. 1-91626). On the other hand, a valve that opens and closes at a constant pressure is arranged in the latter passage.

<Operations and Effects of the Invention> As described above, in the overflow device of the present invention, the outlet of the fuel passage extending from the fuel tank and passing the overflowed fuel 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 fueler.

Since the fuel lid opened at the time of refueling protrudes outward from the vehicle body 5, almost no fuel flows out from the outlet of the fuel passage attached to the inner surface of the fuel lid to the vehicle body. Therefore, the vehicle body will not be discolored.

[Brief description 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 a fuel lid 29, FIG. 3 is a perspective view of the same, and FIG. 4 is a sectional view taken along line AA in FIG. Fig. 5, Fig. 5 is a cross-sectional view showing the three-way valve 20 in a normal refueling state, Fig. 6 is a cross-sectional view showing the three-way valve 20 at the time of super-refueling, and Figs. 7 and 8 are cross-sections showing three-way valves 60, 100 in a modified mode. Fig. 1 …… Overflow device, 6 …… Fuel tank, 33 ……
Opening (outlet), F ... Fuel flow path.

Front page continuation (72) Inventor Minka Ohashi 1 Ochiai, Nagachi, Kasuga-mura, Nishikasugai-gun, Aichi Toyoda Gosei Co., Ltd. (72) Inventor ▲ Yoshi ▼ Masa Kiyo 1 Ochiai, Ochiai, Kasuga-mura, Nishikasugai-gun, Aichi Address: Toyoda Gosei Co., Ltd. (72) Inventor, Hokari, No. 8 Tsutana, Fujisawa City, Kanagawa Prefecture, Isuzu Motors Ltd., Fujisawa Plant (72) Tsujio Fujita, No. 8, Fujisawa, Kanagawa Prefecture, Isawa Motor Company, Fujisawa Plant Within

Claims (1)

[Claims] 1. An overflow device at the time of refueling, characterized in that a fuel passage through which overflowed fuel flows is extended from a vehicle fuel tank, and an outlet of the fuel passage is attached downward to the inner surface of the fuel lid. .