JP2003136593A - Structure of joined parts of plastic molded articles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for joined parts of plastic molded articles capable of forming a closed space preventing the outflow of flash without generating deformation in the plastic molded articles and locking the generated flash to prevent the movement thereof. SOLUTION: In the structure for the joined parts of the plastic molded articles constituted so as to confine the flash generated from the inner walls of the mutually fusion-bonded parts of the plastic molded articles in the space, the continuous rib, which is protruded to the opposed surface from the edge part of the closure member of either one of the opposed positions of the plastic molded articles partitioning the space and higher than the space closed by the closure member and has a flexible member at its leading end part, is formed and a hermetically closed small space is formed by the rib and the inner walls.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION When welding plastic molded products to each other by welding, burrs may occur on the inner wall side.
The burr generated on the inside of such a container-shaped molded article may flow out to another place in the case of a container in which some liquid flows inside. The present invention provides a structure of a joint portion of a plastic molded product which prevents the above-mentioned burr from flowing out.

[0002]

2. Description of the Related Art Conventionally, container-shaped plastic molded articles of various shapes have been formed by welding and joining the opening-side ends of a container-shaped plastic member. As means for joining the ends of the plastic members together, heat is applied to the joining surfaces to cause welding, or members are butted against each other and pressed and rubbed to generate heat, melt and join, or vibrate to members. Are applied to vibrate and weld, or ultrasonic waves are applied to the members for welding, and these welding and joining means have excellent joining characteristics at the relevant parts after joining, and are suitable for the production of various plastic molded products. Has been adopted.

However, burrs often occur at the joint due to the pressing force of a jig for holding and pressing the joint, a load due to vibration, a difference in solidification speed during solidification of the joint, and the like. Therefore, burrs generated at the joints of plastic molded products are blown off by high-pressure air, sucked, or manually removed, but depending on the shape of the molded product, burrs or the like may be removed by these means. There are areas that cannot be removed. For example, when the plastic members are welded to each other to form a container-shaped molded product, the space inside may be closed. In the above-described molded article which is a device in which fluid moves in the closed space, burrs of these fluids flow out to other devices, which causes a problem of clogging the various devices in detail. Therefore, various joint structures have been proposed in order to prevent burrs generated inside from flowing out to other places.

[0004]

As a countermeasure against the outflow of the burr, a burr pool is provided inside the joint of the plastic members to prevent the outflow of the burr. FIG. 11 shows
A cross-sectional view showing a state where the plastic members are welded to each other,
A burr outflow preventing protrusion A for preventing burr outflow is formed at a position inside the welded part where burr is generated and separated by a predetermined distance. If the tip portion C of the burr outflow prevention protrusion A is formed at a position where the height of the protrusion of the burr outflow prevention protrusion A abuts on the opposite surface of another plastic molded product, and the side wall is welded in this state, the welding A small closed space B is formed between the plastic moldings. The closed small space B serves as a gathering place for burrs, which prevents burrs from flowing out. However, it suffices if the height of the burr outflow prevention protrusion A can be set to a height that coincides with the position where it comes into contact with another opposing plastic molded product. However, since there is a problem in the manufacturing accuracy of the member and the joint surface D is melted by welding, It is difficult to match the heights of the two, and the tip portion C pushes up the facing surface or creates a gap.

By pushing up the facing surface, the molded product is deformed or a gap is formed, so that burrs generated from the welding surface flow out to other places.

Further, the tip portion C of the burr outflow prevention projection A may be welded, and the tip portion C of the burr outflow prevention projection A has a welding width. The burr generated inside is peeled off from the welded portion and flows out.

In order to solve the drawback that the burr outflow preventing projection A pushes up the member, as shown in FIG. 12, the tip end portion C of the burr outflow preventing projection A is abutted against another plastic molded product which is opposed thereto. It is designed in advance so that the predetermined gap W can be held, and push-up of the molded product due to contact is prevented. In this case, the problem of burr flowing out from the gap W remains.

The present invention solves the above-mentioned drawbacks and makes it possible to form a closed space for preventing the outflow of burrs without causing deformation of the molded product. Further, the generated burr is locked to prevent the burr from moving.

[0009]

According to the present invention, in a structure in which burrs generated from the inner walls of welded portions of plastic molded products are sealed in a space, the plastic molded products partitioning the space are provided at positions opposite to each other. A continuous rib, which is projected from the edge of one of the closing members to the opposite surface, is higher than the height of the space closed by the closing member, and has a tip end made of a flexible member, is formed by the rib and the inner wall. It is characterized by the structure of the joint part of a plastic molded product that forms a small enclosed space.

Further, the present invention is characterized by the structure of the joint portion of the plastic molded product in which the rib tip is formed thin so as to be a flexible member.

Further, the present invention is characterized by the structure of the joint portion of the plastic molded product in which the protruding direction of the rib is inclined from the tip end side toward the inner wall side.

Further, the rib is characterized by a structure of a joint portion of a plastic molded product which is erected from a lower closing member or protrudes downward from an upper closing member.

Further, the present invention is characterized by the structure of a bent portion of a rib or a joint portion of a plastic molded product in which slits are formed at appropriate positions.

Further, the structure of the joint portion of the plastic molded product is characterized in that a protrusion formed by forming a narrow opening at the tip end and a wide base at the back side is formed on the side wall of the rib on the welding side. .

Further, the present invention is characterized by the structure of a joint portion of a plastic molded product in which a rod-shaped projection is formed along the side wall of the rib.

[0016]

DETAILED DESCRIPTION OF THE INVENTION

Example 1 Hereinafter, an example of a plastic molded product in a pump module arranged in a fuel tank of an automobile part will be described. FIG. 1 shows a vertical cross-sectional view of the central portion of the entire pump module in the fuel tank. A pump module 2 is arranged in the fuel tank 1, and a fuel filter 4 is connected to a bottom portion of the fuel tank 1 serving as a suction port of the fuel pump 3. The fuel filter 4 removes a relatively large amount of dust in the fuel, and the periphery thereof is formed of a mesh cloth.

The fuel pump 3 has a cylindrical space in the center and is arranged in the inner space of the surrounding fuel filter 5, and an inflow port to the fuel filter 5 is formed on the downstream side of the fuel pump 3. Has been done. The fuel filter 5 is for removing relatively small foreign matters in the fuel, and has a cylindrical case 6 on the outer periphery thereof. The cylindrical case 6 is formed of a zigzag folded paper or the like. A section 7 is provided. The upper and lower ends of the section 7 are bonded and sandwiched by an upper end plate 8 and a lower end plate 9.

The fuel ascended by the fuel pump 3 is discharged into the fuel filter 5 from the upper portion, is filtered by passing through the inside of the fuel filter 5, is filtered, and is opened in the fuel filter 5. Fuel is supplied from 10 to the engine section.

Upper end plate 8 of the cylindrical case 6 and the portion 7
Is welded to the cap 11 covering the upper part thereof.
The cap 11 is fixedly attached to the opening of the fuel tank 1 by a collar portion 12 formed around the cap 11.

FIG. 2 shows a plan view of the upper end plate 8 and FIG.
4 is a perspective view showing the relationship between the tubular case 6 and the upper end plate 8 and FIG. 4 shows the tubular case 6, the upper end plate 8 and the cap 1.
FIG. 3 is a cross-sectional view showing a welded joint state with No. 1. Tubular case 6
The upper end plate 8 will be fixed to the upper end of the upper end plate 8 of the tubular case. The portion 15 is placed and fixed on the step portion 14. A protrusion 17 that is inscribed in the inner wall surface 16 of the tubular case 6 is provided on the peripheral portion on the back surface side of the upper end plate 8.
Are formed in a tubular shape or an intermittent shape. Top side 1 on the front side
Two ribs 19, 19 are formed upright along the edge portion of 8, and if necessary, the peripheral edge portion has an edge portion 15 at a position located on the step portion 14 of the tubular case 6. Protrusions are formed.

On the other hand, the cap 11 has a shape which entirely conforms to the shape of the upper end of the cylindrical case which covers the upper end plate 8, and a bottom surface 20 which forms a recess is formed on the back surface side of the cap 11. A protrusion 21 is formed on the peripheral edge portion. The tip end surface of the projection 21 and the tip end surface of the upper end portion 13 of the tubular case 6 or the projection of the end edge portion 15 of the upper end plate 8 are opposed to each other, and both are welded Y.

Therefore, when the projections of the upper end portion 13 of the tubular case 6 or the end edge portion 15 of the upper end plate 8 and the cap 11 are welded Y, the upper surface 18 of the upper end plate 8 and the bottom surface of the cap 11 are welded. A space S of height H is formed between 20.

The two ribs 19, 19 erected along both edges of the upper surface 18 of the upper end plate 8 are located in the space S, but the ribs 19, 19 are The height is formed higher than the height H of the space S, and the tip portion thereof is formed thin or flexible so as to be flexible. Therefore, in the state where the cylindrical case 6 and the cap 11 are welded Y, the tip end portion of the rib 19 is bent by the bottom surface 20 of the cap 11 and comes into close contact with it. By slightly inclining the standing direction of the ribs 19 from the upper end plate 8 toward the outside, the bending direction of the push bending by the bottom surface 20 of the cap 11 is directed to the outside.

With the above structure, the upper end portion 1 of the tubular case 6 is
A small space S1 is formed between the rib 19 and the outer wall formed by the inside of the protrusion 3 of the upper end plate 8 and the inside of the protrusion 21 of the end edge portion 15 of the upper end plate 8 and the inside of the protrusion 21 on the peripheral edge of the cap. Will be. The upper end portion 13 of the cylindrical case 6 or the projection of the end edge portion 15 of the upper end plate 8 and the cap 11 are welded to each other.
The burr B generated on the inside by this is retained in the closed space S1 even if it is separated from the location.

By forming a notch in the upper end plate 8 partially, the fuel is discharged from the notch into the fuel filter 5, passes through the inside of the slot 7, and is filtered. Will be discharged from the fuel discharge pipe 10 to the engine section.

[0026]

Second Embodiment The rib 19 forming the closed space S1 is
Although it is formed upright along the edge of the upper surface 18 of the upper end plate 8, it may be formed so as to project from the bottom surface 20 side of the cap 11. Also in this case, the tip of the rib 19 is formed thin or flexible so as to be flexible.

[0027]

[Third Embodiment] FIG. 5 is a perspective view of a rib, in which a thin slit 22 is provided at a bent portion of the rib 19 or at another appropriate position.
By forming an appropriate number of ribs, the rib can be easily bent.

[0028]

[Embodiment 4] FIG. 6 shows the height of the rib 23 in a state where the upper end 24 of the cylindrical case or the protrusion of the end edge of the upper end plate and the protrusion 25 of the peripheral edge of the cap are welded Y. The height H between the upper surface 26 of the upper end plate and the bottom surface of the cap is set to a height H or slightly lower than that, a side wall of the rib 23 on the welding Y side is partially projected, and the projection is formed at the tip end opening 27. Is narrowed and the base portion 28 on the back side is widened.

Due to the shape of the protrusions, the burrs generated during welding are partly engaged with the narrow opening 27, or, in the case of small burrs, the burrs enter into the inner space serving as the base 28. As a result, burrs are accumulated on the protrusions, which makes it possible to prevent the burrs from moving.

The shape of the above-mentioned projections is that of the folds of the curtain shown in FIG. 2, the projection of a curved shape shown in FIG. 6, the projection of the dovetail-shaped dovetail shape 29 of FIG. 7, and FIG. The burr is prevented from flowing out by the projection of the tip bulge shape 30 having a large tip end portion, or the shape of a large number of rod-shaped 31 erected along the rib 23.

FIG. 10 shows an embodiment of a rib 32 in which the shape of the rib 19 of the first embodiment is combined with the shape of the protrusion of the embodiment of FIGS. 2 and 6 to 9. In this case, the tip portion 33 of the rib 32 is formed thin or flexible so as to be flexible. Further, a protrusion 34 is formed on the lower side of the rib 32 excluding the above-mentioned tip portion of the side wall where bending occurs on the welding Y side, and the shape of the protrusion 34 becomes the inner side of the opening 35 at the tip portion narrowing. The base 36 has a wide shape.

With the shape of the rib 32, the burr hermetically closed space S1 is formed, and at the same time, the shape of the protrusion allows the burr to be stored at the position of the protrusion, thereby preventing the burr from flowing out.

In the above embodiment, the description has been made along the welded portions of the plastic molded products of the automobile parts. However, it goes without saying that the present invention is not limited to the automobile components and can be applied to the welded parts of other plastic molded products. .

[0034]

According to the structure of the joint portion of the plastic molded product of the present invention having the above-described structure, the burr generated in the space which becomes the inner wall of the welded portion of the plastic molded products has a tip portion formed along the inner wall. It became possible to form a closed small space closed by continuous ribs made of a flexible member, and prevent the outflow of burrs generated by the space. Further, by forming the protrusions on the ribs, burrs are engaged or enclosed, and it is possible to prevent the burrs from moving.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a central portion of the entire pump module.

FIG. 2 is a plan view of an upper end plate.

FIG. 3 is a perspective view showing a relationship between a tubular case and an upper end plate.

FIG. 4 is a cross-sectional view showing a joined state with a tubular case, an upper end plate and a cap.

FIG. 5 is a perspective view showing a shape of a rib.

FIG. 6 is a perspective view showing a joined state of the tubular case, the upper end plate and the cap.

FIG. 7 is a plan view of a dovetail-shaped dovetail-shaped protrusion.

FIG. 8 is a plan view of a protrusion having a bulging tip with a large tip.

FIG. 9 is a plan view of a shape in which a rod-shaped member is erected along a rib.

FIG. 10 is a perspective view of another embodiment of the rib.

FIG. 11 is a cross-sectional view showing the structure of a joint portion of a conventional plastic molded product.

FIG. 12 is a cross-sectional view showing a structure of a joint portion of a conventional plastic molded product.

[Explanation of symbols]

1 ... Fuel tank 2 ... Pump module 3 ... Fuel pump 4 ... Fuel filter 5 ... Fuel filter 6 ... Cylindrical case 7 ... 8 ... Upper end plate 9 ... Lower end plate 10 ... Fuel discharge pipe 11 ... Cap 12 ... 13 ... Upper end 14 ... Steps 15 ... Edges 16 ... Inner wall surface 17 ... Protrusion 18 ... Top surface 19 ... rib 20 ... bottom surface 21 ... Protrusion 22 ... Slit 23 ... Ribs 24 ... Upper end 25 ... Protrusion 26 ... Top surface 27 ... Opening 28 ... Base 29 .. Ant shape 30 ... Bulging shape 31 ... 32 ... Ribs 33 ... Tip 34 ... 35 ... Opening 36 ... Base

Claims (7)

[Claims] 1. In a structure for sealing a burr generated from the inner wall of a welded portion of plastic molded products in a space, the edge of one of the closing members of the respective plastic molded products which partition the space at opposite positions. Continuous ribs projecting from the portion to the opposite surface and higher than the height of the space closed by the closing member and having a flexible tip portion, and the rib and the inner wall form a closed small space. The structure of the joint part of the plastic molded product characterized by the above. 2. The structure of the joint portion of the plastic molded product according to claim 1, wherein the tip of the rib portion is thinned to form a flexible member. 3. The structure of the joint portion of the plastic molded product according to claim 1, wherein the ribs are formed such that the protruding direction of the ribs is inclined toward the inner wall side. 4. The structure of the joint portion of the plastic molded product according to claim 1, wherein the rib is provided upright from a lower closing member. 5. The structure of the joint portion of the plastic molded product according to claim 1, wherein the rib is provided so as to protrude downward from the upper closing member. 6. The structure of the joint portion of the plastic molded product according to claim 1, wherein a slit is formed at a bent portion of the rib or at an appropriate position. 7. A rib having a welding side is provided with a protrusion having a narrow opening on the tip end and a wide base on the back end. Structure of the joint part of the plastic molding described.