JPH0684760B2 - Ejector pump for vehicle fuel tank system - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an ejector pump for a vehicle fuel tank device.

2. Description of the Related Art Among fuel tank devices for automobiles, for example, Japanese Patent Laid-Open No. 61-650
As disclosed in Japanese Patent Publication No. 57, due to the structural reason of the part on which the tank body is mounted, a bulging part is formed inward on the bottom wall of the tank body. There is a tank in which a main chamber and a sub chamber are separated from each other in a substantially lower half part.

In this type of structure, when the fuel level decreases and the fuel level drops, a large amount of fuel remains in the sub chamber, so the feed pump in the main chamber and one of the discharge fuels connected to it are A guide pipe for leading out the portion and an ejector pump formed at this end are arranged, and a suction pipe having a suction port near the bottom of the sub chamber is connected to the ejector pump to drive the feed pump. The fuel in the main chamber is transferred to the fuel supply device of the engine, and at the same time, the fuel in the sub chamber is transferred to the main chamber side by the ejector action of the ejector pump.

Problems to be Solved by the Invention An ejector pump is composed of four parts including an induction pipe, a suction pipe, a nozzle, and a discharge pipe including a negative pressure chamber. Moreover, the guide pipe, the suction pipe, and the discharge pipe respectively project from the negative pressure chamber including the nozzle in different directions, that is, in three directions.

For this reason, when the ejector pump is mounted in the tank body through the work hole formed in the tank body, for example, when the guide pipe and the discharge pipe are passed vertically through the work hole, the suction pipe moves horizontally. Since it is projected in the direction, it is necessary to make the working hole large so that the suction pipe can pass therethrough.

However, if the working hole is enlarged, the strength of the tank body may be reduced.

Therefore, the present invention provides an ejector pump for a fuel tank device for a vehicle, in which the work hole can be made small and the strength of the tank main body can be improved, without causing a hindrance to the mounting workability.

Means for Solving the Problems One surface of the fuel tank is connected from an outside of the tank main body to the inside of the tank main body, which is supported by the one surface and is extended to an induction pipe, and an intake pipe extending parallel to the induction pipe. An ejector pump for a vehicle fuel tank device including a resin upper plate integrally having an induction pipe connecting portion and an intake pipe connecting portion, and a nozzle connected to a lower side of the induction pipe connecting portion. A negative pressure chamber and a resin lower plate integrally formed with an introduction portion extending from the suction pipe connection portion to the negative pressure chamber and a discharge portion connected to the lower side of the negative pressure chamber are coupled to each other and an induction pipe is connected. The portion and the suction pipe connecting portion are projected in parallel upward.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. In FIGS. 1 to 4, reference numeral 1 denotes a tank main body, and a bulging portion 2 is formed inwardly at a substantially central portion of a bottom wall thereof.
A main chamber 3 and a sub chamber 4 are separated from each other in a substantially lower half portion of the tank body 1.

A working hole 5 is provided in the wall of the tank body 1 above the main chamber 3, and another working hole 6 is provided in the wall of the tank body 1 above the sub chamber 4. An outlet pipe 10 connected to a fuel supply device (not shown) is inserted into the main chamber 3 through the working hole 5, and a feed pump 7 is connected to the tip of the outlet pipe 10.

Reference numeral 16 is a filter for the feed pump 7, and 13 is a lid for closing the working hole 5. The lid 13 has an outlet pipe 10, a guide pipe 8 and a suction pipe 11 which will be described later.
And are pierced. Reference numeral 14 denotes a stay fixed to the lid 13 and supporting the feed pump 7.

A guide pipe 8 connected to a fuel supply device (not shown) is inserted into the main chamber 3, and an intake pipe 11 whose one end is inserted into the sub chamber 4 from the working hole 6 on the sub chamber 4 side. The other end is inserted, and an ejector pump 9 described later is connected to the guide pipe 8 and the suction pipe 11.

Reference numeral 15 denotes a lid for closing the working hole 6 on the side of the sub chamber 4,
A suction pipe 11 is provided through the lid 15. Also,
Reference numeral 12 denotes a filter attached to the suction port 11a of the suction pipe 11.

The ejector pump 9 uses the jet flow when the surplus fuel of the fuel sent from the feed pump 7 to the fuel supply device returns to the main chamber 3 along the guide pipe 8 and is discharged to the inside of the ejector pump 9. A pressure region is formed, and the negative pressure guides the fuel in the sub chamber 4 to the main chamber 3 via the suction pipe 11.

The ejector pump 9 will be specifically described.

In FIGS. 1 and 2, the ejector pump 9 is made of an oil-resistant resin, and includes an induction pipe connecting portion 22 and a suction pipe connecting portion 23.
An upper plate 20 in which a nozzle 28 is formed at the lower end of the guide pipe connecting portion 22, and a negative pressure chamber 30 that encloses the tip end portion of the nozzle 28 at the coaxial position. A lower plate 21 integrally formed with an introduction portion 31 extending from the suction pipe connection portion 23 to the negative pressure chamber 30 and a discharge pipe 32 as a discharge portion connected to a lower side of the discharge port 30a of the negative pressure chamber 30. I have it.

Then, the concave portion 29 formed on the lower surface peripheral edge of the upper plate 20.
And the convex portion 33 formed on the peripheral edge of the upper surface of the lower plate 21 are fitted to each other, and the upper plate 20 and the lower plate 21 are coupled to each other so that the negative pressure chamber 30 and the introduction portion 31 are separated from each other. Has become.

Flanges 24, 25 are formed on the upper edges of the guide pipe connecting portion 22 and the suction pipe connecting portion 23 of the upper plate 20, respectively,
Seal receiving portions 26, 27 are formed stepwise on the inner peripheral edges of the flanges 24, 25.

On the other hand, in the vertical middle portion of the guide pipe connecting portion 22,
A branch port 34 is provided, and a relief valve 60 for opening and closing a communication hole 35 provided in the guide pipe connecting portion 22 is provided at the branch port 34.
(Shown in FIG. 2) are provided.

The pipe socket 36 is attached to the flanges 24 and 25 of the guide pipe connecting portion 22 and the suction pipe connecting portion 23 of the upper plate 20 thus configured via the seal rings 54 and 55.

The pipe socket 36 is in close contact with the seal rings 54 and 55, and the guide pipe connecting portion 22 and the suction pipe connecting portion 23 are provided.
Guide pipe socket 37 that engages with each flange 24, 25 of
And a suction pipe socket branch 38 and a bridge portion 39 connecting these branches.

The guide pipe socket portion 37 and the suction pipe socket portion 38
A plurality of slits 40, 41 are formed in the lower half of the lower portion at regular intervals in the circumferential direction, and elastic pieces 42, 43 having claw portions 44, 45 are formed between the slits 40, 41, respectively.

Further, in the upper openings of the guide pipe socket portion 37 and the suction pipe socket portion 38, a small-diameter tubular pipe adapter portion 4 is provided.
6 and 47 are provided, and concave portions 50 and 51 for receiving the convex portions 56 and 58 formed on the outer walls of the guide pipe 8 and the suction pipe 11 are formed on the inner walls of the pipe adapter portions 46 and 47.

Therefore, by engaging the convex portion 56 and the concave portion 50 and engaging the guide pipe socket portion 37 and the flange portion 24, the inner peripheral surface of the end portion of the guide pipe 8 is guided as shown in FIG. The pipe connecting portion 22 is smoothly connected to the lower half of the inner peripheral surface. Further, by engaging the convex portion 58 and the concave portion 51 with each other and the intake pipe socket portion 38 and the flange portion 25 with each other, the inner peripheral surface of the end portion of the intake pipe 11 is made into the second portion.
As shown in the figure, the suction pipe connecting portion 23 is smoothly connected to the lower half of the inner peripheral surface.

The pipe adapters 46, 47 have slits 5 for smoothly receiving the guide pipe 8 and the suction pipe 11.
2, 53 are formed. Further, seal lips 54a and 55a that are in close contact with the guide pipe 8 and the suction pipe 11 are formed on the inner peripheral walls of the seal rings 54 and 55.

The guide pipe socket portion 37 and the suction pipe socket portion 38 are connected to each other by connecting wall 4 between the pipe adapter portions 46 and 47.
They are connected by a bridge portion 39 having 8 and 49.

According to the structure of the above embodiment, when the feed pump 7 is driven, the fuel in the main chamber 3 is sucked through the filter 16 and transferred through the outlet pipe 10 to the fuel supply device for the engine (not shown). Since not all the discharged fuel is consumed in the fuel supply device of No. 3, the surplus fuel is led to the guide pipe 8 from the fuel supply device. The fuel discharged to the guide pipe 8 is jetted from the nozzle 28 toward the discharge port 30a of the negative pressure chamber 30 of the ejector pump 9 through the guide pipe connecting portion 22 by the discharge pressure of the feed pump 7.

Due to the jetting of fuel from the nozzle 28, a negative pressure is generated in the negative pressure chamber 30, and the negative pressure causes the fuel in the sub chamber 4 to flow from the suction pipe 11 to the suction pipe connecting portion 23 and the introduction portion 31. The main chamber 3 is sucked into the negative pressure chamber 30 through the discharge pipe 32 from the discharge port 30a together with the fuel injected from the nozzle 28.
Be transferred in.

On the other hand, since the ejector pump 9 can be assembled by assembling the upper plate 20 and the lower plate 21 with the concave portion 29 and the convex portion 33 in an airtight manner, the ejector pump 9 can be easily assembled and has high reliability.

Further, the upper portions of the guide pipe connecting portion 22 and the suction pipe connecting portion 23 are connected to the pipe socket 36 in which the guide pipe socket portion 37 and the suction pipe socket portion 38 are connected by a bridge 39.
Since they are connected by a guide pipe 8 and a suction pipe
When fitting 11, the external force F as shown in FIG. 3 can prevent breakage of the guide pipe connecting portion 22 and the suction pipe connecting portion 23 from the root portion.

Since the guide pipe 8 and the suction pipe 11 have different diameters, the pipe receiving portions 57 and 59 and the pipe adapter portions 46 and 47 to which the guide pipe 8 and the suction pipe 11 are fitted and mounted have different diameters. It is also possible to prevent erroneous assembly of the guide pipe 8 and the suction pipe 11.

In addition, since the guide pipe connecting portion 22 and the suction pipe connecting portion 23, which are integrally formed on the upper plate 20, are projected in parallel upward from the upper plate 20, the lateral width dimension of the ejector pump 9 is reduced. The ejector pump 9 can be compactly formed.

Therefore, since the ejector pump 9 can be supported only by the pipe socket 36, a special bracket is not required and the workability of mounting is improved.

In addition, the work hole 5 for inserting the ejector pump 9 into the tank body 1 can be small, and the strength and rigidity of the tank body 1 can be increased accordingly, and the space occupied by the ejector pump 9 in the tank body 1 can be increased. The space is reduced, and the space for arranging other parts can be secured.

Since the guide pipe connecting portion 22 and the suction pipe connecting portion 23 extend upward and parallel to each other, the guide pipe connecting portion 22
When the guide pipe 8 and the suction pipe 11 are connected to each of the suction pipe connection portion 23 and the suction pipe connection portion 23, the connection direction is one direction, which facilitates the assembling work and only separates them in the vertical direction during manufacturing. Since a simple mold can be used, the structure of the mold is simplified and the manufacturing cost can be reduced.

FIG. 5 shows another embodiment of the present invention, in which a branch socket 61 is provided in a portion of the outlet pipe 10 inside the tank body 1, and the branch socket 61 is provided with a guide pipe.
8A is connected so that the guide pipe 8A is not exposed to the outside of the tank body 1.

Although not shown, the nozzle is formed separately from the upper plate, the nozzle is retrofitted to the upper plate, the nozzle is integrally formed on the lower plate side, or the suction pipe is bulged in the tank body. Even if the ejector pump is connected across the parts or the recesses and protrusions of the upper plate and the lower plate are reversed, the same effect as that of the above embodiment can be obtained.

As described above, according to the present invention, since the induction pipe connection portion and the suction pipe connection portion integrally formed with the upper plate are projected in parallel upward from the upper plate, The width of the ejector pump is reduced, and the ejector pump can be compactly formed.

Therefore, the work hole for inserting the ejector pump into the tank main body is small, the strength and rigidity of the tank main body can be increased correspondingly, and the space occupied by the ejector pump in the tank main body is reduced, and other parts Can secure a sufficient space for arrangement.

Further, since the guide pipe connecting portion and the suction pipe connecting portion are projected in parallel upward, when connecting the guide pipe and the suction pipe to each of the guide pipe connecting portion and the suction pipe connecting portion, the connection is made. Since the direction is unidirectional, the assembling work can be facilitated, and since a simple molding die that is separated only in the vertical direction can be used during manufacturing, the structure of the molding die is simplified and the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective sectional view of an embodiment of the present invention, FIG. 2 is a sectional view of the embodiment, FIG. 3 is a side view showing an assembled state of the embodiment, and FIG. 4 shows an ejector pump. FIG. 5 is a schematic configuration diagram of a fuel tank included therein, and FIG. 5 is a schematic configuration diagram of another fuel tank including an ejector pump. 1 ... Tank body, 9 ... Ejector pump, 20 ... Upper plate, 21 ... Lower plate, 22 ... Induction pipe connection, 23 ... Suction pipe connection, 30 ... Negative pressure chamber, 30a ...
Discharge port, 31 …… Introduction part, 32 …… Discharge pipe (discharge part).

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location F02M 37/18 7049-3G (72) Inventor Junya Ohno 2 Takara-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Automobile Co., Ltd. (72) Inventor Kiyokazu Yamamoto 1760, Higashimatano-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Automotive Electric Industry Co., Ltd. (72) Inventor, Toshiyuki Matsuki 1760, Higashimatano-cho, Totsuka-ku, Yokohama-shi, Kanagawa (56) Bibliographic Reference Shokai 56-124300 (JP, U)

Claims (1)

[Claims] 1. A vehicle for connecting one surface of a fuel tank from the outside of the tank body to the inside of the tank body and connected to an induction pipe that is supported by this one surface and an intake pipe that extends in parallel with the induction pipe. An ejector pump for a fuel tank device, the negative pressure chamber including a resin upper plate integrally having a guide pipe connecting portion and a suction pipe connecting portion, and a nozzle connected to a lower side of the guide pipe connecting portion. And a resin lower plate integrally formed with an introduction part extending from the suction pipe connection part to the negative pressure chamber and a discharge part connected to the lower side of the negative pressure chamber, and the induction pipe connection part and the suction part. An ejector pump for a fuel tank device for a vehicle, characterized in that the pipe connecting portion is projected upward in parallel.