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Cover body mounting structure of resin container

a technology for resin containers and mounting structures, applied in the direction of liquid fuel feeders, machines/engines, transportation and packaging, etc., can solve the problems of insufficient fastening strength, insecure sealing performance, undesirable affecting the layer structure, etc., to achieve the effect of reducing the number of components, reducing the number of parts, and high degree of reliability

Inactive Publication Date: 2007-03-22
YACHIYO IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0027] A cover-mounting structure of a plastic container according to the present invention is a cover-mounting structure of a plastic container having a cover for closing an opening provided in a plastic container body at least part of which is made of a barrier material, wherein a portion of the plastic container where the opening is provided has a flange portion; the cover-mounting structure of the plastic container comprising: a recess provided annularly along a peripheral edge of the opening at an outside of the plastic container body, with an annular member being embedded integrally in the recess; the cover resting against the flange portion to close the opening; a seal provided between the flange portion and the cover to prevent a leak; and an annular retainer fastened to the annular member while resting against an external surface of the cover.
[0028] In this cover-mounting structure of a plastic container having a construction as described above, a seamless annular member is embedded in a portion around an opening of a tank body made of plastic to form an integral part thereof, and thus the strength of fastening between the plastic tank body and the cover can be improved.
[0029] Further, an annular member assumes an undivided ring-shaped geometry with no local rigidity variation point that would be involved at seams of a ring-shaped geometry, and thus good hermetical sealing performance between the tank body and the cover can be stably achieved.

Problems solved by technology

Among the aforementioned conventional examples, however, the structure which is configured to have a holding ring divided into two segments which are in turn fastened together using a bolt / nut pair so as to clamp a cover disadvantageously could not exercise sufficient fastening strength.
In addition, such a divided holding ring could hardly form a perfect circle, and thus segmentally contact the outer surface of the wall defining the opening of the tank body, which would disadvantageously make its sealing performance insecure.
The structure which is configured to have a holding ring (camlock member) embedded in the external surface of the wall of the tank body made of plastic by an insert molding process would sever a barrier layer of the plastic tank body, which would undesirably affect a layer structure thereof.
The problems encountered in this structure are: it would be difficult to ensure dimensional accuracy of the height of the upper surface on either side of the groove which height is measured when the upper surface comes into contact with the holding plate, and particularly to control the dimensional accuracy in a blow molding process; it would be difficult to finish a bottom surface of the groove to the highest standard in surface roughness, with the result that good sealing performance could not be achieved.
On the other hand, the structure in which the fuel tank is made of plastic, and a tank body thereof and a cover plate (mount plate) as a cap member are made of plastic would undergo deterioration effects of time on plastic material, disadvantageously lowering the accuracy and strength of a portion where the part fixing portion is mounted.
Since still another of the aforementioned conventional examples in which the tank body is made of plastic would allow the tank body to shrink by heat with the passage of time, disadvantageously, the accuracy of a joint portion where the annular member and the tank body (plastic container) are joined together could hardly be improved.

Method used

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  • Cover body mounting structure of resin container
  • Cover body mounting structure of resin container
  • Cover body mounting structure of resin container

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0102]FIG. 1 schematically shows a fuel tank according to a first embodiment; FIG. 1(a) is a perspective view of a cover-mounting structure, and FIG. 1(b) is a vertical sectional view taken along line A-A of FIG. 1(a). As shown in FIGS. 1(a) and 1(b), a fuel tank T, at least part of which plastic tank body is of a barrier material, includes a plastic tank body 2 for storing fuel and an opening 7 provided in the tank body 2, whereas a cover 1 is mounted over the opening 7. On the cover 1, integrally fixed thereto are a fuel feed passage 4 for supplying an automotive engine with fuel fed from a fuel pump 6 provided in the plastic tank body 2, a fuel recirculation passage 5 through which unconsumed fuel flows back from the engine, and other components. In the plastic tank body 2 is provided a fitting port 3 to which one end of a fuel feed pipe is to be coupled while the other end thereof is to open on a vehicle body of an automobile.

[0103]FIG. 2 schematically shows the cover 1 of the ...

second embodiment

[0109]FIG. 3(a) is an enlarged sectional view of a cover-mounting structure of a fuel tank according to a second embodiment. The second embodiment exemplifies a structure in which an annular member 38 with bolts 31 fitted upwardly therein is integrally insert-molded in a tank body 32 made of plastic.

[0110] In FIG. 3(a), the same elements as in FIG. 2(b) are designated by the same reference numerals, and a description thereof will be omitted.

[0111] As shown in FIG. 3(a), the annular member 38 with the bolts 31 inserted therethrough and projected upwardly therefrom is integrally insert-molded in the tank body 32. The cover-mounting structure according to the second embodiment is different, in that the bolts 31 are fitted in the annular member 38, from the first embodiment in which the bolts 11 are integrally formed in the annular member 8 by welding or the like as shown in FIG. 2.

[0112] A description will now be given of the cover-mounting structure of a fuel tank having the above ...

third embodiment

[0115]FIG. 3(b) is an enlarged sectional view of a cover-mounting structure of a fuel tank according to a third embodiment. The third embodiment exemplifies a structure in which bolts 41 are fitted in an annular member 48 integrally insert-molded in a tank body 42 made of plastic.

[0116] In FIG. 3(b), the same elements as in FIG. 2(b) are designated by the same reference numerals, and a description thereof will be omitted.

[0117] As shown in FIG. 3(b), the annular member 48 is integrally insert-molded in the tank body 42 made of plastic. The cover-mounting structure according to the third embodiment is different, in that the fitting of the bolts 41 into the annular member 48 follows the insert molding of the annular member 48 in the tank body 42, from the second embodiment in which the annular member 38 having the bolts 31 fitted therein is insert-molded in the tank body 32.

[0118] A description will now be given of the cover-mounting structure of a fuel tank having the above constr...

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PUM

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Abstract

A portion of the plastic container T where an opening 7 is provided has a flange portion 7a, and provided are a recess provided annularly along a peripheral edge of the opening 7 at an outside of the plastic container body 2, with an annular member being embedded integrally in the recess, a cover 1 resting against the flange portion to close the opening 7, a seal 14 provided between the flange portion 7a and the cover 1 to prevent a leak, and an annular retainer 9 fastened to the annular member 8 while resting against an external surface of the cover 1. This allows the opening 7 provided in the plastic container T and the cover 1 to be fastened together firmly with excellent and stable hermetical sealing performance.

Description

TECHNICAL FIELD [0001] This invention relates to cover-mounting structures of a plastic container such as an automotive fuel tank, which container has an opening provided with a cover mounted to close the opening. BACKGROUND ART [0002] The plastic container provided with an opening at one surface and a cover for closing the opening is employed, for example, as an automotive fuel tank or the like. An example of the automotive fuel tank is schematically illustrated in perspective in FIG. 23(a). A fuel tank 340, as shown in FIG. 23(a), includes a cover 341 and a fitting port 342 to which a fuel feed pipe is coupled. As shown in FIG. 23(b), which is a vertical section taken along line S-S of FIG. 23(a), on top of a fuel tank body 343 is provided an opening 345 to fit a pump module 344 therein, and the opening 345 is closed with the cover 341. Integrally fixed on the cover 341 are a fuel feed passage 346 for supplying an automotive engine with fuel fed from the pump module 344, a fuel re...

Claims

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Application Information

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IPC IPC(8): B65D1/34B60K15/03F02M37/10
CPCB60K15/03177F02M37/103B60K2015/03447
Inventor NAKAMURA, KAZUHIROSATO, SHOJIWATANABE, YOSHIHIROYOSHIZAWA, YUJIMURABAYASHI, SHINYAMATSUMOTO, HIDEKINAKAMURA, TADAHISAKANEKO, NAOMASAKOSEKI, JUNICHISATO, DAISUKENAKAI, TOSHIAKIYANASE, TAIKI
Owner YACHIYO IND CO LTD