JP7028738B2 - Intake system parts - Google Patents

Description

The present invention relates to an intake system component, and more particularly to an intake system component constituting an intake passage of an internal combustion engine.

In the intake passage that introduces the outside air into the internal combustion engine, there is an air cleaner for filtering the dust contained in the outside air when the outside air is introduced, and a muffling device for reducing the intake noise generated by opening and closing the intake valve. , Various structures are attached, and intake system parts equipped with an air cleaner, a silencer, etc. in these intake passages are known.

Such intake system parts are integrated by welding a plurality of divided bodies made of synthetic resin or the like to each other, and various merits such as reduction of the number of parts and weight reduction by using synthetic resin are known. Has been done.

For example, the intake duct described in Patent Document 1 below is configured by combining two halves made of a fiber molded body, and describes a method of integrating the halves with each other by heat welding. .. Further, as a means for welding a plurality of divided bodies made of synthetic resin to each other, not only heat welding but also various welding means such as vibration welding and ultrasonic welding are known.

JP-A-2015-34508

However, according to the above-mentioned configuration of the conventional intake system parts, it is necessary to set the arrangement of the intake passage and the structure so that the intake passage and the structure can be simply configured as two halves as described in Patent Document 1. There was a problem that it was difficult to set a complicated form.

For example, when an intake system component is composed of three or more divided bodies, it is widely used to perform a welding process in two stages of primary welding the first member and the second member and then secondary welding the third member. However, in a complicated form, the welding surfaces of the second member and the third member are covered with the first member in the secondary welding, and a vibration jig or the like directly suppresses the welding surface. There was a problem that the welding strength of the site was lowered without being able to do so. Therefore, it is not possible to adopt a structure having such a complicated form, and there is a problem that the degree of freedom in design is low.

Therefore, the present invention has been made in view of the above problems, and it is possible to realize welding having a desired welding strength even if it has a welding surface that cannot be directly pressed when a plurality of members are welded. The purpose is to provide intake system parts.

The intake system component according to the present invention is an intake system component that is formed by welding the first member, the second member, and the third member that are separated from each other while applying pressure, and has a structure and a closed space. The closed space is defined by at least a top surface formed on the first member, a side wall portion formed on the second member, and a bottom surface formed on the third member, and the structure is the second member. At least a part of the welded surface of the structure is arranged in the closed space while being defined by the member and the third member, and one of the top surface and the second member is the top surface and the second member. It is characterized by including a strut portion that comes into contact with the inner wall surface of any one of the second members.

Further, in the intake system component according to the present invention, the second member has a first structure dividing portion that constitutes a part of the structure, and the strut portion is the first structure dividing portion. It is preferable to be arranged along the outer edge of the.

Further, in the intake system component according to the present invention, it is preferable that the strut portion has a predetermined gap between the strut portion and the side wall portion.

Further, in the intake system component according to the present invention, it is preferable that the third member has a second structure dividing portion corresponding to the first structure dividing portion.

Further, in the intake system component according to the present invention, it is preferable that the third member is welded to the second member after welding the first member and the second member.

The outline of the above invention does not list all the necessary features of the present invention, and subcombinations of these feature groups can also be an invention.

Since one of the first member and the second member of the intake system component according to the present invention includes a strut portion that abuts on the inner wall surface of either the first member or the second member, the first member and the first member. Even when the second member is first welded and then the third member is secondarily welded, the vibration from the vibration jig in contact with the first member can vibrate the welded surface via the strut portion. Welding strength can be ensured even in a structure in which the welding surface cannot be directly oscillated.

The perspective view of the intake system component which concerns on embodiment of this invention. It is an exploded view of the intake system component which concerns on embodiment of this invention. The figure which shows the structure of the 2nd member and the 3rd member. FIG. 1 is a sectional view taken along the line AA in FIG. The perspective view for demonstrating the process of primary welding of the intake system component which concerns on embodiment of this invention. The perspective view for demonstrating the process of secondary welding of the intake system component which concerns on embodiment of this invention.

Hereinafter, suitable embodiments for carrying out the present invention will be described with reference to the drawings. It should be noted that the following embodiments do not limit the invention according to each claim, and not all combinations of features described in the embodiments are essential for the means for solving the invention. ..

FIG. 1 is a perspective view of an intake system component according to an embodiment of the present invention, FIG. 2 is an exploded view of an intake system component according to an embodiment of the present invention, and FIG. 3 shows a second member and a third. It is a figure which shows the structure of the member, FIG. 4 is a cross-sectional view of AA in FIG. 1, and FIG. 5 is a perspective view for explaining the process of primary welding of the intake system component which concerns on embodiment of this invention. FIG. 6 is a perspective view for explaining a process of secondary welding of an intake system component according to an embodiment of the present invention.

As shown in FIG. 1, the intake system component 1 according to the present embodiment is integrally integrated with a pipeline 2 as a structure serving as an intake passage for introducing filtered outside air into an internal combustion engine. It is attached and has a closed space 3 which is a box-shaped resonator main body having a predetermined capacity. The pipeline 2 is a tubular member having a smooth inner wall, and various forms such as a circular shape, an elliptical shape, and a polygonal shape are known.

The inside of the pipe line 2 and the closed space 3 are communicated with each other by a communication pipe (not shown), and the volume of the closed space 3 and the diameter and length of the communication pipe are based on Helmholtz's resonance theory according to the frequency to be attenuated. Will be decided. Then, by setting the frequency according to the intake noise as the pulsating noise generated by opening and closing the intake valve by the drive of the internal combustion engine, these intake noises can be reduced.

As shown in FIG. 2, the intake system component 1 according to the present embodiment is integrated by welding the first member 10, the second member 20, and the third member 30 formed of synthetic resin, respectively. There is. Here, various welding methods can be applied as a specific welding method, and for example, vibration welding is preferably used. The specific welding method will be described later. Further, it is preferable that the first member 10, the second member 20, and the third member 30 are formed of a thermoplastic synthetic resin such as a polyamide resin or a polypropylene resin.

The first member 10 is a substantially plate-shaped member, and includes a top surface 11 that closes the opening of the second member 20 to form the upper surface of the closed space 3.

The second member 20 has a side wall portion 23 forming the outer peripheral side surface of the closed space 3, and has openings in the directions facing the first member 10 and the third member 30, respectively. Further, the second member 20 has a first structure dividing portion 24 constituting the pipeline 2. The first structure dividing portion 24 is arranged so as to pass through the inside of the closed space 3, and the first structure welding surface 21 is formed along the extending direction of the first structure dividing portion 24. Has been done. Further, on the surface of the first structure welding surface 21 opposite to the welding surface (the surface facing the first member 10), a strut portion 22 is formed so as to stand in contact with the inner wall surface of the first member 10. Has been done.

Further, as shown in FIG. 3, the strut portion 22 formed on the first structure welding surface 21 of the second member 20 has a first structure between the strut portion 22 and the side wall portion 23 forming the outer edge of the closed space 3. A gap G is formed in the direction along the extending direction of the body welding surface 21. The capacity of the closed space 3 is secured by the gap G without completely dividing the closed space 3. The size of the gap G can be appropriately changed according to the required requirements.

Further, as shown in FIG. 2, the third member 30 is a bottomed box-shaped member having an outer wall surface and a bottom surface 33 along the lower opening of the second member 20, and is a first structure division. A second structure dividing portion 32 corresponding to the portion 24 is formed. In the second structure dividing portion 32, a second structure welding surface 31 corresponding to the first structure welding surface 21 of the first structure dividing portion 24 is formed, and as shown in FIG. The pipeline 2 is configured so as to extend the inside of the closed space 3 by welding the first structure welding surface 21 and the second structure welding surface 31.

Further, as shown in FIG. 4, the strut portion 22 stands upright from the first structure welding surface 21 and is in contact with the inner wall surface 12 of the first member 10. Therefore, as described later, when the first member 10 and the second member 20 are first welded and then the third member 30 is secondarily welded, the first structure welding surface 21 and the second structure welding surface 31 are used. By pressing from above the first member 10 and from below the third member 30, the first structure welding surface 21 and the second structure welding surface 31 are pressed via the strut portion 22. Can be done. Therefore, even when the welded surface of the pipeline 2 extends inside the closed space 3, the welded surface can be reliably pressed and vibrated, so that a design having such a welded surface is possible. At the same time, welding can be reliably performed via the strut portion 22, so that the welding strength is improved.

Next, a welding method of the intake system parts according to the present embodiment will be described with reference to FIGS. 5 and 6. First, as primary welding, welding of the first member 10 and the second member 20 is performed. In the primary welding, the first member 10 is assembled to the upper open end of the side wall portion 23 of the second member 20, and these members are pressed from above and below with a jig, and one of them is vibrated to press each other's welded surfaces. Weld.

Further, after the primary welding, the third member 30 is assembled to the lower open end of the second member 20 to perform welding. At this time, as described above, the strut portion 22 is attached to the inner wall surface 12 of the first member 10. Since they are in contact with each other, by pressing the first member 10, the first structure welding surface 21 and the second structure welding surface 31 can be pressed via the strut portion 22, so that the welding surface is welded. Can be performed reliably and firmly. The welding surfaces other than the first structure welding surface 21 and the second structure welding surface 31 can be welded by pressing the outer edge portion of the second member 20 and the third member 30.

The intake system component 1 according to the present embodiment configured in this way has a shape such that the welded surface extends into the closed space 3, such as the first structure welded surface 21 and the second structure welded surface 31. Even if there is, welding can be surely performed, and welding strength can be ensured by surely vibrating by the strut portion 22.

In the above-described intake system component 1 according to the present embodiment, the case where the abutment portion 22 is erected substantially vertically from the first structure welding surface 21 has been described, but the abutment portion is the first structure. It may be formed so as to be inclined with respect to the welding surface 21. With such a configuration, it is not necessary to use a slide core for the mold for molding the second member having the strut portion, and it is possible to suppress the manufacturing cost of the mold.

Further, the intake system component 1 according to the present embodiment has described the case where the strut portion 22 is formed on the second member 20, but the strut portion 22 is erected from the inner wall surface 12 of the first member 10. , It may be configured to be in contact with the first structure welding surface 21.

Further, in the present embodiment, the case where the air intake system component is applied to a sound deadening device composed of an intake air passage and a resonator has been described, but the closed space can be applied not only to the resonator but also to, for example, an air cleaner. Is. Further, in the present embodiment, the case where the pipeline is formed as the structure has been described, but the structure is not limited to the pipeline, and the resonance chamber is defined when, for example, a small resonance chamber is separately provided in the resonator. It may be used as a wall to form.

Further, in the present embodiment, the case where the top surface is formed on the first member and the bottom surface is formed on the third member has been described, but the bottom surface is formed on the first member and the top surface is formed on the third member. It may be formed. Further, in the present embodiment, the case where the first member, the second member, and the third member are overlapped and combined in the vertical direction has been described, but the first member, the second member, and the third member may be overlapped in the horizontal direction and combined with each other. It is clear from the description of the claims that the form with such changes or improvements may be included in the technical scope of the present invention.

1 Intake system parts, 2 Pipe lines, 3 Closed space, 10 1st member, 11 Top surface, 12 Inner wall surface, 20 2nd member, 21 1st structure welding surface, 22 Tsuitate part, 23 Side wall part, 24th 1 structure division part, 30 third member, 31 second structure welding surface, 32 second structure division part, 33 bottom surface, G gap.

Claims (5)

It is an intake system component that is formed by welding the first member, the second member, and the third member that are separated from each other while applying pressure, and has a structure and a closed space.
The closed space is defined by at least a top surface formed on the first member, a side wall portion formed on the second member, and a bottom surface formed on the third member.
The structure is defined by the second member and the third member, and at least a part of the welding surface of the structure is arranged in the closed space.
An intake system component characterized in that one of the top surface and the second member is provided with a strut portion that comes into contact with the inner wall surface of any one of the top surface and the second member. In the intake system component according to claim 1,
The second member has a first structure dividing portion that constitutes a part of the structure.
The intake system component is characterized in that the strut portion is arranged along the outer edge of the first structure division portion. In the intake system component according to claim 2,
The intake system component is characterized in that the strut portion has a predetermined gap between the strut portion and the side wall portion. In the intake system component according to claim 2 or 3.
The third member is an intake system component having a second structure dividing portion corresponding to the first structure dividing portion. In the intake system component according to any one of claims 1 to 4 .
The third member is an intake system component characterized in that the first member and the second member are welded and then welded to the second member.

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