JP2003252069A - Oil feed pipe for fuel tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil feed pipe for a fuel tank which can smoothly feed oil. <P>SOLUTION: The oil feed pipe 2 with one end thereof connected to the fuel tank 1 and with an oil feed gun insertion part 4 provided on the other end thereof has a double pipe structure comprising a small diameter pipe 5 of the diameter substantially as large as that of the oil feed gun 3 and a large diameter pipe 2a to surround the small diameter pipe so as to form a flow passage 6 to allow the fuel overflowing from the small diameter pipe to flow as the oil is fed between the small diameter pipe and the large diameter pipe. The high flow rate of the fuel in the small diameter pipe can be kept when the fuel is fed, and the fuel in the entire fuel pipes can be sucked into the fuel tank by the merging with the fuel which overflows from the small diameter pipe and flows in the flow passage between the small diameter pipe and the large diameter pipe at an open end part on the tank side of the small diameter pipe. Oil can be smoothly fed by this suction effect. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an oil supply pipe for a fuel tank.

[0002]

2. Description of the Related Art Conventionally, there is an automobile, for example, a four-wheeled automobile, in which a fuel tank is arranged below a floor in order to widen a passenger compartment and a luggage compartment (for example, Japanese Patent No. 31203).
35 gazette). When the fuel tank is arranged in the lower portion of the vehicle body as described above, the fuel supply pipe connected to the fuel tank is provided so as to extend upward from the fuel tank. Further, in such a layout, it is difficult to avoid interference with other members, so the middle portion of the fuel supply pipe is bent.

In the fuel tank oil supply pipe, the fuel level rises in the oil supply pipe to some extent as the fuel is supplied. This is because the capacity of the fuel entering the fuel tank through the fuel supply pipe is less than the fuel supply amount due to the passage resistance in the fuel supply pipe. Then, when the fuel liquid level rises to some extent in the fuel supply pipe, the head pressure increases the amount of passage through the fuel supply pipe, and the increased amount of passage and the amount of oil supply balance to stabilize the fuel liquid level height. Here, when the fuel impinging on the inner surface of the fuel supply pipe foams or the like and the passage resistance increases, the fuel liquid level continues to rise without losing its balance and reaches the fuel gun.
In such a case, the mouth of the negative pressure sensor as a full tank sensor provided at the tip of the refueling gun is blocked, so the refueling device will be full even if the fuel tank is not full. It is judged that it has become, and the refueling is automatically stopped. This is false detection of full tank.

[0004]

However, when the oil supply pipe is bent in the middle as described above,
There is a problem that fuel is likely to collide with the inner surface of the fuel supply pipe and bubbles easily, which makes it difficult to smoothly perform fueling and also causes an erroneous detection of full tank by the full tank sensor.

[0005]

In order to solve the above problems and realize a fuel tank oil supply pipe that enables smooth oil supply, in the present invention, injection from an oil supply gun (3) is performed. A fuel supply pipe (2) for guiding the fuel to the fuel tank (1), one end of the fuel supply pipe (2) is connected to the fuel tank (1), and the other end of the fuel supply pipe (2) Is provided with a refueling gun insertion portion (4) into which a refueling gun (3) is inserted, and the refueling pipe (2) includes a small diameter pipe (5) having substantially the same diameter as the refueling gun (3), and the small diameter pipe. A large-diameter pipe (2a) surrounding the small-diameter pipe (5) so that a flow path (6) is formed between the small-diameter pipe and (5) to flow the fuel overflowing from the small-diameter pipe.
It has a double tube part consisting of

According to this, at the time of refueling, the flow velocity of the fuel in the small diameter pipe can be kept high, and at the open end of the small diameter pipe on the tank side, it overflows from the small diameter pipe and flows through the flow path between the small diameter pipe and the large diameter pipe. By merging with the fuel that came in, the fuel of the entire refueling pipe can be drawn into the fuel tank. This retraction effect enables smooth refueling.

Further, a portion of the large diameter pipe (2a) from the opening end of the small diameter pipe (5) on the fuel tank (1) side to the fuel tank (1) surrounds the small diameter pipe (5). If the diameter is smaller than that of the small diameter portion, it means that it is throttled at the outlet of the small diameter pipe (opening on the fuel tank side), so that there is an effect that the fuel flowing out from the small diameter pipe is drawn into the fuel tank. , The smooth refueling of fuel can be further enhanced.

Further, since the small diameter pipe (5) is provided with the guide portion (5a) for coaxially inserting the tip portion of the fuel gun (3), the tip portion of the fuel gun is provided. It becomes easy to position the small-diameter pipe coaxially, and the fuel can be suitably discharged into the small-diameter pipe.

Further, the small diameter pipe (5) is provided with a positioning portion (5b) for restricting the insertion depth of the tip portion (3a) of the oil supply gun (3), and the guide portion (5).
Since the opening (5c) for exposing the full tank sensor (7) provided in the refueling gun (3) is provided in a), the refueling gun is always coaxial with the small diameter pipe. In addition, the tip portion can be tightly inserted into the small diameter pipe, and the fuel can be surely poured into the small diameter pipe.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail based on specific examples shown in the accompanying drawings.

FIG. 1 is a side sectional view schematically showing a fuel tank oil supply pipe to which the present invention is applied. A fuel tank 1 is provided at a lower portion of a vehicle body (not shown), and one end of an oil supply pipe 2 is connected to the fuel tank 1. Above the fuel tank 1, a fuel gun insertion portion 4 for inserting the fuel gun 3
Is provided. The other end of the fuel supply pipe 2 is connected to one end of the fuel supply gun insertion portion 4, and the other end of the fuel supply gun insertion portion 4 is open to the side surface of the vehicle body. The figure shows a state in which refueling gun 3 is inserted into refueling gun insertion portion 4 for refueling.

Further, in the illustrated example, the oil supply pipe 2 is directed obliquely downward from the oil supply gun insertion portion 4 in the illustrated example,
It is formed to be bent at a proper position so as to descend substantially vertically and extend in the horizontal direction toward the fuel tank 1 at a position substantially the same as the fuel tank 1.

The refueling pipe 2 has a small-diameter pipe 5 provided between the refueling gun insertion portion 4 and the front side of the fuel tank 1, as shown in the figure. The small-diameter pipe 5 has substantially the same diameter as the diameter of the tip portion 3a of the refueling gun 3 (larger diameter than the tip portion 3a in the illustrated example), and is located in a portion of the refueling pipe 2 that receives the small-diameter pipe 5. Has a double-pipe structure including a large-diameter pipe portion 2a as a large-diameter pipe and a small-diameter pipe 5.

The refueling gun insertion portion 4 is arranged so that the tip portion 3a and the small diameter pipe 5 are coaxially positioned with the refueling gun 3 inserted for refueling as shown in FIG. It is formed so that it can be held. Although the holding structure is not shown, it may be possible by appropriately adjusting the guide shape for inserting the refueling gun 3. Thereby, most of the fuel at the time of refueling can be poured into the small diameter pipe 5. Further, there is a gap between the small diameter pipe 5 and the large diameter pipe portion 2a, and the flow passage 6 is formed by the gap.

In the fuel supply pipe 2 thus constructed, when fuel is supplied by the fuel supply gun 3, fuel is discharged from the tip portion 3a of the fuel supply gun 3 as shown by an arrow A in FIG. . Since the tip portion 3a of the fuel gun 3 and the small diameter pipe 5 are substantially aligned as described above, most of the fuel discharged from the tip portion 3a flows into the small diameter pipe 5. Then, the fuel flows out from the opening end of the small diameter pipe 5 on the fuel tank 1 side into the fuel supply pipe 2 as shown by an arrow B in the figure, and then enters the fuel tank 1.

Since most of the fuel flows in the small diameter pipe 5 as described above, the flow velocity of the fuel in the small diameter pipe 5 can be kept high during refueling. At the open end of the small-diameter pipe 5 on the fuel tank 1 side, the fuel flows from the small-diameter pipe 5 and flows into the flow path 6 between the small-diameter pipe 5 and the large-diameter pipe 2a.
The entire fuel can be drawn into the fuel tank 1 side.
This retraction effect enables smooth refueling. Further, since the air in the fuel supply pipe 5 can escape to the fuel supply gun insertion portion 4 via the flow path 6 as shown by an arrow C in the figure, the fuel flowing in the small diameter pipe 5 is resistant to the rise of air. It doesn't receive much.

The tip portion 3a of the refueling gun 3 has a structure shown in FIG.
As shown in enlarged form, a negative pressure sensor 7 is provided as a full tank sensor. This is because when the air (bubbles) mixed with fuel vapor generated by refueling rises to the refueling gun insertion portion 4 in the automatic fueling device, it is detected that the mouth of the negative pressure sensor 7 is blocked by the bubbles. Then, the fuel supply is automatically stopped. Therefore, when a large amount of bubbles are generated in the fuel supply pipe during refueling, it is erroneously determined that the tank is full.

One of the causes of the erroneous determination is that the bubbles rising in the oil supply pipe when the tank is almost full are accumulated in the oil supply gun insertion portion 4. On the other hand, in the refueling pipe 2 of the present invention, with the refueling gun 3 inserted in the refueling gun insertion portion 4, the tip portion 3a of the refueling gun 3 and the small diameter pipe 5 are coaxial with each other as described above. To position. Further, as shown in FIG. 2, the holding position of the fueling gun 3 may be set so that the opening of the small diameter pipe 5 is located with respect to the tip of the tip 3a. As a result, the bubbles that have risen in the small diameter pipe 5 can be released into the flow path 6 as indicated by an arrow D in the figure, and early misdetermination of full tank can be prevented.

The opening of the small-diameter pipe 5 is formed in a funnel shape so as to open toward the tip 3a of the fueling gun 3. This makes it easier to guide the fuel discharged from the tip portion 3a into the small diameter pipe 5.

Next, FIG. 3 shows a second embodiment. Note that, in FIG. 3, the same parts as those in the above-described illustrated example are denoted by the same reference numerals, and detailed description thereof will be omitted. In the second embodiment, the inner diameter of the small-diameter pipe 5 is set to a size such that the tip portion 3a can be inserted into the small-diameter pipe 5 with almost no gap, and the fuel gun insertion portion of the small-diameter pipe 5 is set. A guide portion 5a that opens like a trumpet is provided on the fourth side. A stopper 5b for positioning the insertion depth of the fuel gun 3 is formed by, for example, partially projecting a peripheral wall of the small diameter pipe 5 inward in the radial direction.

As a result, the refueling gun 3 can always be inserted into the small-diameter pipe 5 coaxially and with the same insertion depth. At that time, since the tip portion 3a can be easily inserted while being guided by the guide portion 5a, the inner diameter of the small-diameter tube 5 and the outer diameter of the tip portion 3a can be made substantially the same, and both of them in the inserted state can be coaxial. It can enhance the sex.

Further, the small-diameter pipe 5 is provided with an opening 5c for exposing the negative pressure sensor 7 of the tip portion 3a in the positioned and inserted state to the outside of the small-diameter pipe 5. Further, on the fuel tank side of the fuel supply pipe 5 with respect to the stopper 5b,
A plurality of overflow holes 5d arranged in the circumferential direction are provided.

In the second embodiment, the tip 3a can be tightly inserted into the small diameter pipe 5, so that the fuel can be surely poured into the small diameter pipe 5. Even if the tip portion 3a is held in this way, the negative pressure sensor 7 is not blocked by the small-diameter pipe 5, and it is possible to suitably refuel up to the original full state. Since the fuel rising in the small diameter pipe 5 can be released to the flow path 6 side before the tip portion 3a, there is no problem in the fuel injection into the small diameter pipe 5 by the above structure.

Further, FIG. 4 shows a third embodiment. Also in this illustrated example, the same parts as those in the above illustrated example are denoted by the same reference numerals, and detailed description thereof will be omitted. In the third embodiment, the fuel tank 1 of the oil supply pipe 2
On the side, the inner diameter of the large-diameter pipe portion 2a surrounding the small-diameter pipe 5 is made larger than that of the portion from the end portion of the small-diameter pipe 5 to the connection portion to the fuel tank 1 (small-diameter portion 2b). There is. The inner diameter of the small diameter portion 2b may be the same as that in the illustrated example, and the large diameter pipe portion 2a may be expanded in diameter.

By doing so, the large diameter pipe portion 2a
Since the space between the small-diameter portion 2b and the small-diameter portion 2b is narrowed, there is an effect that the fuel flowing out from the small-diameter pipe 5 to the small-diameter portion 2b can be drawn in as indicated by an arrow B. Therefore, smooth refueling of fuel can be further enhanced.

In the illustrated example, the open end of the small diameter pipe 5 on the fuel tank side is located at substantially the same height as the connecting portion of the fuel supply pipe 2 to the fuel tank 1. When refueling using the refueling head difference, when the small-diameter pipe 5 reaches the lowermost end,
Since there is no need for a pipe line beyond that, connect the small-diameter pipe 5 to the fuel tank 1
There is no need to extend the length, and the material cost can be saved.

[0027]

As described above, according to the present invention, the flow velocity of the fuel in the small diameter pipe can be kept high at the time of refueling, and at the open end portion of the small diameter pipe on the tank side, the small diameter pipe overflows from the small diameter pipe. By joining with the fuel that has flowed through the flow path between them, the fuel in the entire fuel supply pipe can be drawn into the fuel tank. This retraction effect enables smooth refueling.

Further, by narrowing the fuel supply pipe on the fuel tank side of the small diameter pipe, the flow velocity of the fuel flowing out from the small diameter pipe is increased, and the fuel at the open end of the small diameter pipe on the tank side is drawn into the fuel tank. The effect is enhanced, and smooth refueling of fuel can be further enhanced. In addition, by providing a guide for inserting the tip of the fuel gun coaxially in the small-diameter pipe, it becomes easy to position the tip of the fuel gun and the small-diameter pipe coaxially. Can be suitably released toward. In addition, the small-diameter pipe is provided with a positioning part that restricts the insertion depth of the tip of the fuel gun, and an opening for exposing the full tank sensor is provided in the guide part, so that the fuel gun is always coaxial with the small-diameter pipe. And with the same insertion depth,
Since the tip portion can be tightly inserted into the small diameter pipe, the fuel can be reliably poured into the small diameter pipe.

[Brief description of drawings]

FIG. 1 is a side sectional view schematically showing a fuel tank oil supply pipe to which the present invention is applied.

FIG. 2 is an enlarged side sectional view of an essential part showing a portion of the small diameter pipe on the fuel gun side.

FIG. 3 is an enlarged side sectional view of an essential part showing a portion of a small-diameter pipe on the fuel gun side according to a second embodiment.

FIG. 4 is a view corresponding to FIG. 1 showing a third embodiment.

[Explanation of symbols]

1 Fuel Tank 2 Oil Supply Pipe, 2a Large Diameter Pipe 3 Oil Supply Gun, 3a Tip 4 Oil Supply Gun Insertion Section 5 Small Diameter Tube, 5a Guide Section, 5b Positioning Section, 5c
Opening 6 Flow path 7 Negative pressure sensor (full tank sensor)

Claims (4)

[Claims] 1. A fueling pipe for guiding fuel injected from a fueling gun to a fuel tank, wherein one end of the fueling pipe is connected to the fuel tank, and the fueling gun is inserted at the other end of the fueling pipe. And a small diameter pipe having a diameter substantially the same as that of the fuel filling gun, and a flow passage for flowing fuel overflowing from the small diameter pipe due to refueling is formed between the small diameter pipe and the small diameter pipe. Thus, the fuel tank oil supply pipe is characterized by having a double pipe portion composed of a large diameter pipe surrounding the small diameter pipe. 2. A portion of the large diameter pipe extending from the fuel tank side opening end of the small diameter pipe to the fuel tank is formed to have a smaller diameter than a portion surrounding the small diameter pipe. The fuel tank oil supply pipe according to claim 1. 3. The fuel tank refueling according to claim 1 or 2, wherein the small diameter pipe is provided with a guide portion for coaxially inserting a tip end portion of the refueling gun. tube. 4. The small-diameter pipe is provided with a positioning portion that regulates the insertion depth of the tip portion of the fuel gun, and
The fuel tank oil supply pipe according to any one of claims 1 to 3, wherein the guide portion is provided with an opening for exposing a full tank sensor provided in the oil supply gun.