JP3115361B2 - Resin container and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin container such as a fuel tank for an automobile and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, in a resin container such as a fuel tank for an automobile, an opening is formed in an upper surface of a hollow container main body, and a mounting portion protruding outward is provided on a peripheral edge of the opening. , made is attached et through the cover member is a bolt member or nut member on the unit with said mounting is known.

[0003] In such a resin container, it is necessary to provide a nut member or a bolt member for screwing the bolt member or the nut member to the resin container body in order to attach the lid member. The insert molding is performed from the viewpoint of improvement of the quality.

[0004]

However, in the case of such insert molding, the time required for molding the tank body for insert molding of the nut member or the bolt member becomes long, and the production efficiency is poor. . Also, it is difficult to accurately determine the position of the nut member or bolt member,
There are also problems in terms of dimensional accuracy and assembly workability.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a resin container which can be manufactured with high production efficiency and a method for manufacturing the same.

[0006]

According to the present invention, an opening is formed in the upper surface of a hollow container main body, and a mounting portion projecting outward is provided on a peripheral edge of the opening, and a lid member is provided in the mounting portion. Is presumed to be a resin container in which is attached via a bolt member and a method of manufacturing the same.

According to a first aspect of the present invention, the mounting portion has an annular base on the lower surface side of which a nut member to which the bolt member is screwed is disposed at a predetermined interval in a circumferential direction, and a lower surface of the base lower surface. With the base protruding at a distance below the inner and outer rims ,
Extending in the circumferential direction of the part, with the nut member between
Inner and outer peripheral walls fitted in a sandwiched state, wherein the lower end edges of the inner and outer peripheral walls of the mounting portion are on the periphery of the opening of the container body, and the lower surface of the nut member is Content
It is configured to be welded leaving a space located between the upper surface of the container main body . In the invention of claim 2, the nut member has a projection on the lower surface side, and the projection contacts the upper surface of the container body.

A third aspect of the present invention is a method of manufacturing a resin container, comprising: an annular base portion and a lower portion projecting downward from the inner and outer peripheral edges of the lower surface of the base portion at intervals from each other, and extending in the circumferential direction of the base portion. /> to form a mounting member having an inner and outer circumferential walls extending
You. Then, the bolt member is screwed into the lower side of the base.
The nut member to be set at a predetermined interval in the circumferential direction of the base.
Between the inner and outer peripheral walls.
And then the inside and outside of the mounting member
The lower edge of the surrounding wall is brought into contact with the periphery of the opening of the container body.
Between the nut member lower surface and the container body upper surface.
The mounting member is welded to the container main body to form a mounting portion by welding while leaving a space in the container.

[0009]

According to the first aspect of the present invention, the lower ends of the inner and outer peripheral wall portions of the mounting portion are attached to the container body around the opening .
It is welded leaving a space located between the nut member lower surface and the container body upper surface . Therefore, the area of the portion to be welded can be small. According to the invention of claim 2, the space is reliably secured between the inner side and the outer circumferential wall portion by Tsu <br/> the protrusion.

According to the third aspect of the present invention, the area of the lower ends of the inner and outer peripheral walls of the mounting member welded to the periphery of the opening of the container body is small, the heat conductivity is good, and the mounting member to the container body is good. Welding time is shortened. It also reduces thermal deformation.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In FIG. 1 showing a cover member mounting portion of a resin container, reference numeral 1 denotes a fuel tank as a resin container, and an opening 3 is formed in an upper surface 2a of the tank body 2, and a peripheral portion of the opening 3 A metal cover member 5 for mounting a fuel pump (not shown) for supplying fuel to an engine or the like to the mounting portion 4. Is to be installed.

The mounting member 4 has a nut member 6 on the lower surface side.
Predetermined interval (equal angular intervals in the circumferential direction, for example, 120 degrees
An annular base portion 4a disposed with an interval therebetween, and the base portion 4a
In a state where it protrudes with a space below the inner and outer peripheral edges of the lower surface
The nut member 6 extends in the circumferential direction of the base 4a from below.
Inner and outer peripheral wall portions 4b fitted in a sandwiched state ,
And it has a cross-section gate type and a 4c. Then, the lower edge of the mounting portion 4 (below the inner and outer peripheral wall portions 4b, 4c)
(Edge) is welded to the periphery of the opening 3 of the tank body 2 leaving a space 8 between the inner and outer peripheral wall portions 4b and 4c. The base 4a has a through hole 4d corresponding to the nut member 6.

The nut member 6 has a projection 6a on the lower surface side.
The protruding portion 6a abuts on the upper surface 2a of the tank main body 2, and the upper surface 2
A space 8 from a is secured.

[0015] the upper surface of the mounting portion 4 (the base portion 4a) is annular sheet - de as sealing material - is placed a lid member 5 through the nut-shaped gasket 9, the lid member 5, through the its Hole 5
a, through hole 9a of gasket 9 and through hole 4 of mounting portion 4
The bolt member 10 screwed to the nut member 6 through d.

To manufacture the fuel tank 1, first,
A mounting member 4A having an annular base 4a and inner and outer peripheral walls 4e and 4f extending to the same side from the inner and outer peripheral edges of the lower surface of the base 4a is formed. In this case, since the mounting member 4A serving as the mounting portion 4 is formed by itself without performing insert molding of a nut member or the like, moldability is good.

Then, the inner and outer peripheral walls 4e,
4f, a cover member 5 is provided below the base 4a so as to be located between the cover members 5f.
The nut member 6 to which the bolt member 10 for attaching the nut is screwed is mounted at a predetermined interval by tight fitting or the like.

Thereafter, the mounting member 4A is welded to the tank main body 2 with the lower end edges of the inner and outer peripheral walls 4e and 4f abutting the peripheral edge of the opening 3 of the tank main body 2. The lower portions of the inner and outer peripheral walls 4e and 4f are melted to form the inner and outer peripheral walls 4b and 4c as the mounting portion 4.

Then, the gasket 9 is applied to the upper surface of the mounting portion 4, and the lid member 5 is overlaid thereon, and the bolt is inserted through the through hole 5 a of the lid member 5, the through hole 9 a of the gasket 9, and the through hole 4 d of the mounting portion 4. The fuel tank 1 is formed by inserting the member 10, screwing it into the nut member 6 and tightening it. The gasket 9 ensures sealing between the lid member 5 and the mounting portion 4.

With the above construction, the mounting portion 4 welds the entire lower end edges of the inner and outer peripheral wall portions 4b and 4c having a relatively small wall thickness to the tank body 2 with the space 8 present. Therefore, the area of the welded portion can be reduced, and the sealability at the welded portion between the mounting portion 4 and the tank body 2 is not impaired. Because the area of the welding part is small,
This is advantageous in terms of thermal conductivity, the welding time of the mounting portion 4 to the upper surface 2a of the tank body 2 is shortened, the production efficiency is good, the deformation due to the welding is small, and the dimensional accuracy is improved.

In particular, the protrusion 6a provided on the nut member 6 secures a predetermined distance from the upper surface 2a of the tank body 2 so that the space 8 is reliably left between the two walls 4b and 4c. Therefore, the area to be welded to the tank main body 2 does not have an area corresponding to the base 4a, but only the lower end surfaces of the two walls 4b and 4c, and the area is small, which is advantageous in terms of thermal conductivity. And the production efficiency can be improved. By setting the welding temperature and time, the space 8 can be formed without providing such a protruding portion 6a of the nut member 6.

[0022]

[Effect of the Invention] The invention of claim 1, as described above, attached
From the inner and outer perimeters of the bottom surface of the base
Around the opening at the lower end of the inner and outer peripheral walls
Against the rim of the container body, fitting mounted from the lower side between the circumferential wall portion
Space between the lower surface of the nut member and the upper surface of the container body.
Because of the presence and welding, the area of the welding portion of the mounting portion may be small, which is advantageous in terms of thermal conductivity, the welding time is shortened, and production can be performed with high production efficiency.
Further, since the area of the portion to be welded is small and the welding time is short, deformation due to heat is small and dimensional accuracy is excellent. Also,
According to the second aspect of the present invention, the space between the inner and outer peripheral wall portions can be reliably ensured by the protrusion.

Further, according to the third aspect of the present invention, the area of the lower end portions of the inner and outer peripheral walls of the mounting member welded to the periphery of the opening of the container body is small, the heat conductivity is good, and the welding time is short. Therefore, it is possible to manufacture with high production efficiency and high dimensional accuracy.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part showing a cover member mounting portion of a resin container.

FIG. 2 is an explanatory diagram of a method for manufacturing a resin container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fuel tank (resin container) 2 Tank main body (container main body) 2a Upper surface 3 Opening 4 Attachment part 4a Base 4b Inner peripheral wall part 4c Outer peripheral wall part 4A Attachment part 4e Inner peripheral wall 4f Outer peripheral wall 5 Cover member 6 Nut member 6a Projection 10 Bolt member

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 45/02 B29D 31/00 B65D 53/02 B65D 45/24

Claims (3)

(57) [Claims] An opening is formed in an upper surface of a hollow container main body, and a mounting portion projecting outward is provided on a peripheral edge of the opening, and a lid member is mounted to the mounting portion via a bolt member. A resin container, wherein the mounting portion has an annular base portion on the lower surface side of which a nut member screwed with the bolt member is disposed at a predetermined interval in a circumferential direction ; An interval is set below the inner and outer peripheral edges of the lower surface of the base.
Extending in the circumferential direction of the base with the
The inside where the nut member is fitted with it sandwiched from below
And an outer peripheral wall portion , wherein lower end edges of the inner and outer peripheral wall portions of the mounting portion are on a peripheral edge of an opening of the container main body, the nut member lower surface and the container main body.
A resin container which is welded while leaving a space located between the upper surface and the upper surface . 2. The nut member has a projection on a lower surface side,
The resin container according to claim 1, wherein the projecting portion is in contact with an upper surface of the container body. 3. An opening is formed in the upper surface of the hollow container main body, and a mounting portion is provided on the periphery of the opening so as to protrude outward, and a lid member is mounted on the mounting portion via a bolt member. a method of manufacturing a resin vessel comprising Te, an annular base portion, the mutually distance from the inner and outer peripheral edge of the substrate lower surface
Opened protrude downward, to form a mounting member having an inner and outer circumferential wall extending in the circumferential direction of the base portion, the lower side of the base portion, a nut portion which the bolt member is screwed
The material is placed at a predetermined interval in the circumferential direction of
And the outer peripheral wall is fitted so as to be fitted from below . Then, the lower end edges of the inner and outer peripheral walls of the mounting member are attached.
The nut member is brought into contact with the periphery of the opening of the container body,
Welding leaving a space between the lower surface and the upper surface of the container body
A method of manufacturing a resin container, wherein the mounting member is welded to the container body to form a mounting portion.