JP3359064B2 - Fuel inlet structure of fuel tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel inlet structure of a fuel tank, and more particularly, to a fuel inlet structure of a fuel tank provided with an inlet retainer mounted on an opening of a fuel injection pipe.

[0002]

2. Description of the Related Art A fuel tank of an automobile is provided with a fuel injection pipe for injecting fuel. Generally, a cap is detachably mounted on the fuel injection port and a fuel supply nozzle is guided. , An inlet retainer (hereinafter, simply referred to as a retainer). For example, Shokai 6
Japanese Unexamined Patent Publication No. 3-130324 discloses a funnel-shaped refueling nozzle guide. These retainers are metal cylinders and are joined to the fuel injection pipe by welding.

Further, a ring-shaped cover is joined to the outer periphery of the retainer by brazing or welding so that the outer peripheral surface of the cover is flush with or outer than the outer peripheral surface of the retainer. ing. Also,
It is also known that the cover is formed of a resin cylinder divided into two parts in the axial direction, and is joined so as to sandwich the retainer, and then the joint part in the axial direction is welded.

[0004]

As described above, in the conventional apparatus, since the metal retainer is joined to the fuel injection pipe by welding, the weight is large and the number of welding points is large, so that the manufacturing is easy. It is not expensive.
In addition, even when the above cover is provided, the weight is increased due to the premise of the metal retainer, and the number of welding points is large, which makes manufacture difficult.

Accordingly, the present invention provides a fuel injection port structure for a fuel tank, in which at least a retainer to be mounted on a fuel injection pipe is made of a resin material and has a structure that can be easily mounted. The purpose is to plan.

[0006]

In order to achieve the above object, the present invention relates to a fuel inlet structure of a fuel tank provided with a fuel inlet pipe for mounting a cap on the opening, wherein the opening of the fuel inlet pipe is provided. of a resin cylindrical body fits inside relative
Forming a flange portion at one open end of the resin cylindrical body
An inner member formed with stepped portions on the outer periphery of the flange portion while, from a resin cylindrical body is fitted on the outside of the fuel injection pipe
Forming an upright wall portion at one opening end of the resin tubular body
And an outer member having a step formed on the inner periphery of the upright wall, and a flange formed at an opening of the fuel injection pipe.
Between the step of the outer member and the flange of the inner member.
The standing wall of the outer member and the step of the inner member are joined and welded together with the flange portion of the fuel injection pipe accommodated therein .

[0007]

In the fuel inlet structure of the fuel tank having the above structure, a resin cylinder is provided outside the opening of the fuel injection pipe.
A vertical wall is formed at one opening end of the
With the outer member is fitted to two-stage portion is formed, the fuel
Inside the opening of the injection tube, one open end of the resin cylinder
And a step on the outer periphery
The inner member is fitted with the step of the outer member and the inner member.
The flange of the fuel injection pipe is housed between the
In this state, the upright wall of the outer member and the step of the inner member are joined and welded. Thereby, the opening of the fuel injection pipe is surrounded by the resin member , and the step of the outer member is
Keep the fuel injection pipe flange between the member flange.
Lifting to be Rukoto, the cap is screwed fuel injection pipe is sealed to the inner member, the fuel inlet is suitably protected against the outer member for example an external impact.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a fuel injection port structure according to an embodiment of the present invention. Fuel is injected from an opening of a fuel injection pipe 2 provided in a fuel tank (not shown), and a cap 3 ( (Indicated by a two-dot chain line), the fuel injection pipe 2 is sealed. The opening of the fuel injection pipe 2 is expanded to have a large diameter, and a flange 2a is formed at an end thereof. A retainer 4 is fitted inside the opening of the fuel injection pipe 2, and a cover 5 is fitted outside.

The retainer 4 is a cylindrical body made of resin as shown in FIG. 4 and has an outer diameter substantially equal to the inner diameter of the fuel injection pipe 2 and is formed so as to fit inside the fuel injection pipe 2. ing.
Further, annular grooves 4a and 4b are formed on the outer surface of the retainer 4, and O-rings 6a and 6b are respectively provided as shown in FIG.
Are fitted so that the retainer 4 is accommodated in the fuel injection pipe 2 in a liquid-tight manner. A thread 4c is formed on the inner surface of the retainer 4 so that the cap 3 is screwed. One open end of the retainer 4 has a flange 4
d is integrally formed and the fuel tank side (FIG. 1)
A step portion 4e is formed on the outer periphery of the right side of FIG. The O-rings 6a and 6b may be fitted into an annular groove formed on the inner surface of the cover 5 and sealed on the outer peripheral surface of the fuel injection pipe 2.

On the other hand, the cover 5 is also a cylindrical body made of resin as shown in FIG. 4, and its outer diameter is substantially the same as the outer diameter of the flange portion 4d of the retainer 4, and its inner diameter is the outer diameter of the fuel injection pipe 2. It is formed so as to be fitted to the outside of the fuel injection pipe 2 with substantially the same diameter as that of the fuel injection pipe 2. A step 5 a is formed at one open end of the cover 5, and an upright wall 5 b formed on the outer periphery is configured to fit into the step 4 e of the retainer 4. The axial length of the upright wall portion 5b of the cover 5 is set to be larger than the axial length of the step portion 4e of the retainer 4, so that when the cover 5 and the retainer 4 are joined, the end face of the step portion 5a of the cover 5 is formed. A predetermined gap is formed between the fuel injection pipe 2 and the end face of the flange 4 d of the retainer 4, and the flange 2 a of the fuel injection pipe 2 is accommodated in this gap.

A projection 5c shown in FIGS. 2 to 4 is formed on a part of the step 5a of the cover 5, and a cutout 2b shown in FIGS. 3 and 4 is formed on a part of the fuel injection pipe 2. Have been. Thus, when the cover 5 is fitted to the fuel injection pipe 2, the cover 5 is prevented from rotating with respect to the fuel injection pipe 2 after the fitting by fitting so that the projection 5 c is located within the notch 2 b. be able to.

It is desirable to form a pair of notches 2b at symmetrical positions on the circumference of the flange portion 2a of the fuel injection pipe 2, so that good assembling workability can be obtained. Further, a pair of protrusions 5c may be formed at symmetrical positions on the circumference of the cover 5. Furthermore, of the cover 5,
As shown in FIGS. 2 and 4, an identification display portion 5f such as an arrow is formed on the outer surface corresponding to the portion where the projection 5c is formed, or a paint is adhered to the outer surface, or a more favorable assembling operation is performed. Property is obtained.

When assembling the retainer 4 and the like to the fuel injection pipe 2 in the present embodiment, first, the O-rings 6a and 6b are attached to the retainer 4, and the fuel is injected until the flange 4d comes into contact with the flange 2a of the fuel injection pipe 2. Press into the injection tube 2. Next, the cover 5 is fitted into the fuel injection pipe 2 and the projection 5
c is located in the notch 2b. Thereby, the end face of the upright wall portion 5b of the cover 5 is
e, the flange 4d and the step 5 of the cover 5
The flange portion 2a of the fuel injection pipe 2 is located in the gap formed between the fuel injection pipe 2 and the fuel injection pipe 2. The annular joint between the flange 4d of the retainer 4 and the upright wall 5b of the cover 5 is welded over the entire circumference. Note that the order of attaching the retainer 4 and the cover 5 to the fuel injection pipe 2 may be reversed.

Thus, the opening of the fuel injection pipe 2 is surrounded by the retainer 4 and the cover 5 made of resin, so that the fuel injection pipe 2 is lightweight and easy to manufacture, and is appropriately protected against external impact. . When the cap 3 is screwed into the retainer 4, the fuel injection pipe 2 is sealed.

FIGS. 5 to 7 show another embodiment of the fuel inlet structure of the present invention. In the above embodiment, the cover 5 is fitted from the fuel tank side of the fuel injection pipe 2 (the right side in FIG. 1). In this embodiment, the cover 5
Are fitted from the opening end side (left side in FIG. 1) of the fuel injection pipe 2. As shown in FIGS. 5 and 7, the cover 5 is provided with concave portions 5 at symmetrical positions on the circumference of the step portion 5a.
d is formed (only one side is shown in FIGS. 5 and 7). On the other hand, as shown in FIGS. 5 and 6, the fuel injection pipe 2 has a U-shaped hole 2c formed in the side surface near the opening end. When it is pressed so as to protrude, the cut-and-raised portion 2d is configured to stand upright as is apparent in FIG. 2d
May also be formed in pairs at symmetrical positions. The other configuration is the same as that of the embodiment shown in FIG.

When assembling the cover 5 to the fuel injection pipe 2 in this embodiment, first, the U-shaped hole 2 is used.
The cover 5 is fitted from the opening end side (left side in FIG. 5) of the fuel injection pipe 2 in which the hole c is formed, and when the recess 5d passes through the hole 2c, the cut and raised portion 2d is raised into the recess 5d. In this case, the rotation of the cover 5 with respect to the fuel injection pipe 2 is prevented. The hole 2c may be formed in the opposite direction, and the cut and raised portion 2d may be formed so as to rise on the opening end side of the fuel injection pipe 2.

FIGS. 8 and 9 show still another embodiment of the fuel inlet structure of the present invention, in which a pair of parallel grooves 2e opening at the open end of the fuel injection pipe 2 is formed, and a portion therebetween. Are raised to form the cut-and-raised portions 2f, and the other configuration is the same as that of the embodiment of FIG. Thus, also in this embodiment, the cover 5 can be fitted from the opening end side of the fuel injection pipe 2 as in the embodiment of FIG.

FIG. 10 shows an embodiment in which an interference valve 7 (hereinafter, simply referred to as a valve 7) is added to the retainer 4 in the fuel inlet structure of the present invention. Even if it is formed of a resin material, the valve 7 can be easily attached. That is, the opening end of the retainer 4 located in the fuel injection pipe 2 is reduced in diameter to form a small-diameter opening end 4f, and the valve 7 is rotatably supported on the end surface. . The valve 7 is urged by a spring 8 in a direction to close the opening of the opening end 4f.

When the oil supply nozzle 9 (shown by a two-dot chain line) having a predetermined diameter is inserted into the retainer 4, the valve 7 turns in the direction of the arrow in FIG. Then, the nozzle 9 is inserted into the fuel injection pipe 2 through the open end 4f. Thereby, for example, the fuel to be supplied into the fuel tank can be identified according to the diameter of the refueling nozzle 9, and the predetermined fuel can be supplied.

[0020]

Since the present invention is configured as described above, the following effects can be obtained. That is, according to the fuel inlet structure of the fuel tank of the present invention, the inner member and the outer member of the resin cylinder are fitted into the opening of the fuel injection pipe, and the outer member
Between the shoulder of the fuel injection pipe and the flange of the inner member.
With the lunge part accommodated, the upright wall of the outer member and the inner
It is configured so that the steps of the members are joined and welded.
The opening of the fuel injection pipe is surrounded by these members , and between the step of the outer member and the flange of the inner member.
Since the flange portion of the fuel injection pipe is held at a low temperature, the fuel injection pipe can be made lightweight, easy to manufacture, and inexpensive, and the fuel injection port can be appropriately protected against external impact.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a fuel inlet structure according to one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a part of a fuel inlet structure according to one embodiment of the present invention.

FIG. 3 is a side view of a part of a fuel inlet structure according to one embodiment of the present invention.

FIG. 4 is an exploded perspective view of components constituting a fuel inlet structure according to one embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a part of a fuel inlet structure according to another embodiment of the present invention.

FIG. 6 is a plan view of a part of a fuel injection port structure according to another embodiment of the present invention.

FIG. 7 is a side view of a part of a fuel inlet structure according to another embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a part of a fuel inlet structure according to still another embodiment of the present invention.

FIG. 9 is a plan view of a part of a fuel injection port structure according to still another embodiment of the present invention.

FIG. 10 is a cross-sectional view of a fuel inlet structure according to another embodiment of the present invention.

[Explanation of symbols]

 2 fuel injection pipe 2a flange portion, 2b notch 3 cap 4 retainer (inner member) 4d flange portion 5 cover (outer member) 5a stepped portion, 5b standing wall portion, 5c protrusion 7 valve 9 oiling nozzle

Claims (1)

(57) [Claims] A fuel inlet structure of claim 1 a fuel tank having a fuel inlet tube for mounting the cap to the opening of a resin cylindrical body fits inside relative opening of the fuel injection pipe
Forming a flange portion at one open end of the resin cylindrical body
An inner member formed with stepped portions on the outer periphery of the flange portion while, from a resin cylindrical body is fitted on the outside of the fuel injection pipe
Forming an upright wall portion at one opening end of the resin tubular body
And an outer member having a step formed on the inner periphery of the upright wall, and a flange formed at an opening of the fuel injection pipe.
Between the step of the outer member and the flange of the inner member.
In a state where the flange portion of the fuel injection pipe is housed, the standing wall portion of the outer member and the step portion of the inner member are joined and welded. Entrance structure.