JP3533965B2 - Resin intake manifold - 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 intake manifold used in an automobile engine.

[0002]

2. Description of the Related Art An intake manifold for an automobile engine is used as a part of an intake system for supplying air to each cylinder of the engine. Conventionally, as the intake manifold, a resin intake manifold using a synthetic resin has been developed for the purpose of weight reduction and the like. Since the conventional resin intake manifold has a complicated structure, it cannot be integrally molded,
For example, it is divided into a plurality of parts such as an intake pipe and a surge tank. Then, the separately molded parts are joined together and integrated as an intake manifold.

That is, the resin intake manifold is divided into a plurality of parts in advance so that the die can be easily removed at the time of molding, and thereafter, molding and welding are performed by the number of divisions.

Among the above resin intake manifolds, there is known a structure in which an intake pipe is extended in a surge tank in order to improve intake performance and noise reduction effect. Since the extension portion of the intake pipe is arranged in the surge tank, it cannot be integrally formed with the intake pipe.Therefore, the extension portion is formed as a separate member from the intake pipe and also as a separate member from the surge tank. ing.

Further, the surge tank comprises a lower piece for forming a lower part of the surge tank and an upper piece for forming an upper part of the surge tank, and welds the end faces of the upper and lower pieces which are opposed to each other. It is configured by joining. That is, when the inner piece, which is an extension of the intake pipe, is arranged in the lower piece, the upper piece is welded to the upper piece when the upper piece is welded. The joint end surface of the inner piece is connected to the joint end surface of the intake pipe provided in the upper piece of the surge tank.

Now, an example of the connecting structure of the inner piece to the lower piece will be described in detail. Figure 12
The top view which has arrange | positioned the inner piece 32 in the lower piece 31 of the surge tank for 4-cylinder engines is shown.
The lower piece 31 is formed in a substantially box shape having an open top. The bottom wall 31a and one side wall 31 of the lower piece 31
b has a shape in which four arcuate portions 33 having a semicircular arc-shaped cross section are continuous in the longitudinal direction. Also, the inner piece 32 is
Corresponding to the circular arc portion 33 of the lower piece 31, the corrugated portion 32a is formed by connecting four circular arc portions 34 having a semicircular cross section continuously in the longitudinal direction. And the inner piece 32
Is arranged in the lower piece 31 by associating the circular arc portion 34 with the circular arc portion 33 of the lower piece 31. And
By arranging the arc portions 33 and 34 of the lower piece 31 and the inner piece 32 so as to face each other, an extension portion of an intake pipe (not shown) is formed, and each arc portion 3
The space partitioned between 3, 34 becomes a part of the intake passage S for four cylinders. The intake pipe is provided on the upper surface of the upper piece, and when the upper piece is connected to the lower piece 31, it is connected to the intake passage S of the extension formed between the lower piece 31 and the inner piece 32. .

FIG. 8 is an exploded view before assembling the lower piece 31 and the inner piece 32, and FIG. 9 is a sectional view taken along line BB of FIG. Further, FIG. 10 shows the lower piece 3
1 is an enlarged plan view showing a connecting structure of the inner piece 32 and the inner piece 32, and FIG. 11 is a sectional view taken along the line AA of FIG.

As shown in FIGS. 10 and 11, the side wall 31b of the lower piece 31 is provided at its upper portion with a joint end portion 35 formed in a flange-like shape over the entire circumference, and on the joint end portion 35. A welding rib 36 is provided so as to project. In addition, a pair of fitting holes 37 is formed in the joint end portion 35 of the lower piece 31 located between the arcuate portions 33 and inward of the welding rib 36.

A positioning pin 38 is projectingly provided between the arcuate portions 34 of the inner piece 32 and corresponding to the joint end 35 of the lower piece 31, and is fitted into the fitting hole 37. The inner piece 32 is positioned by fitting the fitting hole 38 of the positioning pin 37.

Further, the welding rib 36 of the lower piece 32 is
The extension part 3 extended so as to be located between the fitting holes 38.
6a is formed. With the inner piece 32 assembled to the lower piece 31 as shown in FIGS. 10 and 11, the side wall end surface of the upper piece (not shown) is welded to the welding rib 36.

In FIG. 9, the mating surface R1 of the joining end portion 35 and the mating surface R2 of the inner piece 32 have semi-circular sections of the arcuate portions 33 and 34. The center of the port O1 to
It must be located on the line L connecting O4.

The above inner piece 32 and lower piece 3
In the connection structure of No. 1, when the positive pressure is generated in the intake passage S and the surge tank, the extending portion 36a of the welding rib 36 is interposed between the intake passages S for each cylinder, so that stress concentration can be reduced,
Since the extension 36a is welded to the upper piece, it has an advantage of high joint strength (welding strength).

[0013]

However, in the above-described conventional connecting structure of the lower piece 31 and the inner piece 32, the welding rib 36a is present between the intake passages S, as shown in FIG. There is a problem that the port pitch P of the intake passage S between the cylinders becomes wide. Therefore, there is a problem that it cannot be made compact.

In comparison with the above-mentioned conventional example, the extension portion 36a of the welding rib 36 is shortened only by providing a joining portion for positioning the fitting pin and the fitting hole for the purpose of downsizing, and the intake passage is formed. An intake manifold having a narrow space S is also proposed.

In this structure, since the arcuate portions 33 and 34 are semicircular in cross section, each member is placed on the line L connecting the centers O1 to O4 of the port for the reason of die cutting (die splitting) in resin molding. The mating surface of must be located. And,
Since the fitting pin and the fitting hole are required for positioning, the extension portion of the welding rib cannot be made longer than in the former case, and as a result, the welding rib is not between the intake passages. Therefore, when the intake passage and the surge tank become positive pressure,
There is a problem that sufficient joining strength cannot be obtained at the joining portion between the intake passages.

The present invention has been made in view of the above circumstances, and provides a resin intake manifold capable of improving the joint strength between the upper piece and the lower piece without widening the port pitch. Is intended.

[0017]

In order to achieve the above-mentioned object, the invention of claim 1 provides a first component, a second component connected to the first component, the first component and the second component. A surge tank is integrally formed by an intermediate part provided between the first part and a plurality of intake pipe passages, and the intermediate part is arranged in the second part. In a resin intake manifold that cooperates with two parts to form a plurality of passage extending portions that are connected to the plurality of intake pipe passages, in the intermediate component, a plurality of first passage extending forming portions are continuously formed. A plurality of second passage extension forming portions of the second component are continuously formed corresponding to the first passage extension forming portions of the intermediate component, and the second component and the intermediate component correspond to each other. To be joined with the passage extension forming parts facing each other The plurality of passage extending portions are configured, the second component is provided with an adhesive rib for joining to the first component, and the first component in the second passage extending forming portion of the second component is provided. A positioning protrusion that also serves as an adhesive rib is formed on the joint end face side with the component, and the positioning protrusion is allowed to penetrate through the joint end face with the first component in the first passage extension forming portion of the intermediate component. The gist of the invention is a resin intake manifold provided with a positioning fitting portion.

According to a second aspect of the present invention, in the first aspect, the positioning convex portion is a resin intake manifold located between the passage extending portions adjacent to each other.

In a third aspect of the present invention, in the first or second aspect, the first passage extension forming portion of the intermediate component is formed in a semicircular arc shape in cross section, and the second passage extension forming portion of the second component is formed. Is a resin intake manifold having a semicircular cross section.

The invention of claim 4 is the first to third aspects of the invention.
In any one of the above items, the adhesive rib of the second component and the positioning protrusion that also serves as the adhesive rib are based on a resin intake manifold welded to the first component.

[0021] The invention of claim 5 is based on claim 1 to claim 4.
In any one of the above items, the positioning projection that also serves as the adhesive rib of the intermediate component is based on a resin intake manifold that is located on an extension line of the adhesive rib of the second component.

The invention of claim 6 is the first to fifth aspects of the invention.
In any one of the above items, the positioning fitting portion is
The gist of the invention is a resin intake manifold that is a through hole that penetrates the positioning protrusion.

(Operation) According to the invention described in claim 1,
In joining the second component and the intermediate component in a state where the corresponding passage extension forming portions are opposed to each other, by penetrating the positioning fitting portion of the intermediate component with respect to the positioning convex portion of the second component, Position and assemble. At the time of this assembly, the positioning protrusion functions as an adhesive rib. That is, the first component is joined to the second component with the intermediate component housed and arranged in the second component as described above.
Then, the positioning protrusion of the second component and the adhesive rib of the second component are joined and connected to the first component, and when the passage extension and the surge tank adjacent to each other become positive pressure, the positioning is performed. Since the convex portions are provided, stress concentration is reduced and the bonding strength can be sufficiently increased.

According to the second aspect of the present invention, since the positioning protrusion is located between the passage extending portions that are adjacent to each other, the passage extending portion and the surge tank that are adjacent to each other have a positive pressure. At this time, stress concentration can be reduced and the bonding strength can be sufficiently increased.

According to the third aspect of the present invention, the first passage extension forming portion of the intermediate component is formed in a semi-circular arc cross section, and the second passage extension forming portion of the second component is formed in a semi-arc arc cross section. Once formed,
The passage extension has a circular cross section. The action of claim 1 or claim 2 can be realized in the passage extending portion having a circular cross section.

According to the invention described in claim 4, the adhesive rib of the second component and the positioning convex portion which also serves as the adhesive rib are:
By welding and joining the first component, the first component and the second component can be firmly joined and connected.

According to the fifth aspect of the present invention, by positioning the positioning convex portion that also serves as the adhesive rib of the second component on the extension line of the adhesive rib of the second component, the distance between the adjacent passage extending portions is increased. It is possible to obtain the minimum required port pitch for obtaining the bonding strength.

According to the invention as set forth in claim 6, the positioning projection can be fitted in the through hole as the positioning fitting part for positioning.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the resin intake manifold according to the present invention is embodied in an intake manifold of an in-line 4-cylinder engine will be described in detail below with reference to FIGS.

FIG. 1 is an exploded perspective view of the intake manifold 1, and FIG. 2 is a perspective view of the intake manifold 1. The intake manifold 1 is composed of an upper piece 2, an inner piece 3 and a lower piece 4. In addition, the surge tank 5 is configured in a state where the upper piece 2 and the lower piece 4 are joined. The upper piece 2, the inner piece 3 as an intermediate component, and the lower piece 4 of the intake manifold 1 are made of a synthetic resin molded by a method such as injection molding (injection molding).

The upper piece 2 is formed in the shape of a box with a lid whose lower part is opened, and a semicircular concave groove (not shown) is formed on the upper wall of the upper piece 2 along the cylinder row direction (longitudinal direction). 4 are connected and arranged in a waveform. An intake passage forming member 8 is welded to the upper piece 2 by vibration welding or the like so as to correspond to each groove. The intake passage forming member 8 has a configuration in which four intake passage forming portions 6 each having a semi-circular cross section are connected in a corrugated manner. The intake passage forming member 8 is also formed by injection molding (injection molding) similarly to the upper piece 2. It is composed of a synthetic resin molded by. The upper piece 2 and the intake passage forming member 8 may be joined by an adhesive instead of the vibration welding.

By the semicircular arc-shaped concave grooves formed in the intake passage forming member 8 and the upper member 2 in a corrugated form,
The divided space serves as an intake pipe passage, and the intake pipe passage is connected to a cylinder of an engine (not shown).

The upper piece 2 is the first part of the present invention,
The lower piece 4 corresponds to the second part. FIG. 3 is a plan view showing a connected state of the lower piece 4 and the inner piece 3 of the intake manifold 1.

As shown in the figure, the lower piece 4 is formed in the shape of a box with a bottom, the upper part of which is open. The bottom surface and one side wall of the bottom piece 4 have an arc portion 9 having a semicircular cross section in the cylinder row direction. It has a continuous shape. The arc portion 9 constitutes a second passage extension forming portion.

Further, the inner piece 3 is provided with a corrugated portion 11 corresponding to the circular arc portion 9 of the lower piece 4 in which four arc portions 10 each having a semicircular cross section are continuously connected in the longitudinal direction. The inner piece 3 is arranged in the lower piece 4 by associating the circular arc portion 10 with the circular arc portion 9 of the lower piece 4. The arc portion 10 constitutes a first passage extension forming portion.

By arranging the arc portions 9 and 10 of the lower piece 4 and the inner piece 3 so as to face each other,
A space defined between the arcuate portions 9 and 10 becomes a part of the intake passage S for four cylinders, and a plurality of passage extending portions communicating with the intake pipe passage are formed. In other words, the passage extension portion has the surge tank 5 with the lower piece 4 provided with the inner piece 3 joined and fixed to the upper piece 2.
It will be arranged inside.

FIG. 4 is an exploded plan view before the lower piece 4 and the inner piece 3 are assembled, and FIG. 5 is a sectional view taken along the line CC of FIG. 6 is an enlarged plan view showing a connecting structure of the lower piece 4 and the inner piece 3, and FIG. 7 is a sectional view taken along the line DD of FIG.

As shown in FIGS. 5 and 7, a joint end 12 is formed on the upper portion of the side wall 4b of the lower piece 4 so as to project like a flange over the entire circumference, and the joint end 12 is formed on the joint end 12. A welding rib 13 as an adhesive rib extends upward and is projected. In addition, in the welding rib 13, the lower piece 4
An extended portion 13a is formed inwardly between the arc portions 9 of each. A pair of circumferential ribs 14a and 14b are formed on the inner and outer edges of the end face of the joining end 12 so as to surround the welding rib 13. The rib 14a,
When the welding rib 13 is joined and welded to the lower end surface of the upper piece 2, 14b serves as a wall for preventing the melted portion from leaking to the outside.

Further, in the lower piece 4, a fitting plate portion 17 is formed so as to project inwardly between the arc portions 9.
On the upper end surface of the fitting plate portion 17, a positioning protrusion 15 as a positioning protrusion is formed at a portion located between the arc portions 9 and inside the extended portion 13a of the welding rib 13. The positioning protrusions 15 are formed on the welding ribs 13.
Is located on the extension line of the extended portion 13a, and the height of the upper end surface thereof is the same as the height of the welding rib 13.

As shown in FIG. 5, a fitting slit 18 is formed on the outer surface between the arcuate portions 10 of the inner piece 3 so as to extend in the vertical direction. On the joining end surface of the joining end portion 19 provided on the upper portion of the inner piece 3, the lower piece 4
A positioning hole 16 as a positioning fitting portion is formed so as to correspond to the joining end portion 12 of. Same positioning hole 16
Are communicated with the fitting slit 18. And
The inner piece 3 has a lower piece 4 in the fitting slit 18.
The fitting plate portion 17 is fitted and the positioning projection 15 is fitted into the positioning hole 16, whereby the lower plate 4 is positioned. Further, a circumferential rib 20 is formed on the peripheral edge surface of the joining end portion 19 of the inner piece 3, and the height of the rib 20 is determined by the positioning projection 16 in the positioning hole 16.
5 is formed so as to have the same height as the ribs 14a and 14b when fitted together.

Then, as shown in FIGS. 6 and 7, in a state where the inner piece 3 is assembled to the lower piece 4, the welding ribs 13 and 13a and the positioning projections 15 project from the side wall of the upper piece 2. The formed joining end surface 2a is welded and joined. 7 shows the joining end surface 2a of the upper piece 2 before joining, and the welding ribs 13, 13 are provided on the joining end surface 2a of the side wall of the upper piece 2.
a, and a joint portion 2 to be welded to the positioning protrusion 15
1, and a fitting groove 2 for fitting the ribs 14a, 14b, 20
Equipped with 2.

In this embodiment, the arc portions 9 and 10 are formed.
Is formed in a semi-circular cross section, and die cutting of resin molding (die cutting)
For this reason, the mating surfaces of the circular arc portions 9 and 10 of the inner piece 3 and the lower piece 4 must be located on the line L connecting the centers O1 to O4 of each port (see FIG. 3). Therefore, in the lower piece 4, the mating surface R1 of the joining end 12 with the inner piece 3 is the inner surface of the rib 14a on the inner circumferential side located between the arc portions 9, as shown in FIGS. In the inner piece 3, the mating surface R2 that faces the mating surface R1 of the lower piece 4 is the outer surface of the rib 20 on the outer peripheral side of the inner piece 3.

Next, the operation of the resin intake manifold constructed as described above will be described. As shown in Figure 1,
The upper piece 2, the inner piece 3, the lower piece 4, and the intake passage forming member 6 made of synthetic resin are molded by injection molding. When the molding of the respective members 2, 3, 4, 6 is completed, the intake passage forming member 6 is set in the upper piece 2 at a predetermined assembly position and welded and joined by the vibration welding method. Alternatively, they may be joined with an adhesive.

The combination of the upper piece 2 and the intake passage forming member 6 forms an intake passage pipe for each cylinder.
Further, when the inner piece 3 is stored in the lower piece 4, the fitting plate portion 17 of the lower piece 4 is fitted into the fitting slit 18 of the inner piece 3 and the positioning projection 15 is fitted into the positioning hole 16. By doing so, the inner piece 3
To the lower piece 4. At this time, in the lower piece 4, the mating surface R1 of the joining end 12 (the inner surface of the rib 14a on the inner peripheral side located between the arc portions 9) and the mating surface of the inner piece 3 (the rib on the outer peripheral side of the inner piece 3). The outer surface 20) R2 abuts each other. As a result, the arc portions 9 and 10 of the lower piece 4 and the inner piece 3 are arranged to face each other, so that the space defined between the arc portions 9 and 10 is a part of the intake passage S for four cylinders. And a plurality of passage extending portions communicating with the intake pipe passage are formed.

Then, as shown in FIGS. 6 and 7, in a state where the inner piece 3 is assembled to the lower piece 4, the welding ribs 13 and 13a and the positioning projections 15 project from the side wall of the upper piece 2. The formed joining end surface 2a is welded and joined. Alternatively, they may be joined with an adhesive. Thus, by assembling the upper piece 2 and the lower piece 4, the passage extending portion and the intake passage pipe are connected.

In the intake manifold 1 assembled in this way, at the joint between the upper piece 2 and the lower piece 4, between the arc portions 9 and between the arc portions 10, the extension portions 13a and the positioning protrusions 15 are respectively provided. Are joined to the joining portion 21 of the upper piece 4.

Since the positioning protrusion 15 functions as a welding rib and the positioning protrusion 15 is interposed between the passage extending portions, when the passage extending portion of the intake manifold 1 and the surge tank 5 become positive pressure, Stress concentration can be reduced,
The bonding strength can be made sufficiently high.

The above-described present embodiment has the following features. (1) In the present embodiment, the lower piece (second component) 4 and the inner piece (intermediate component) 3 are joined together with their corresponding arc portions (passage extension forming portions) 9 and 10 facing each other. Positioning protrusion (positioning protrusion) 15
With respect to the inner piece 3, the positioning fitting hole (positioning fitting portion) 16 was penetrated to position and assemble. Then, at the time of this assembly, the positioning protrusion 1
5 functions as a welding rib (adhesive rib).

That is, when the upper piece (first part) is joined to the lower piece 4 with the inner piece 3 accommodated in the lower piece 4, the positioning protrusion 15 and the welding ribs 13 and 13a of the lower piece 4 are , Upper piece 2
When the passage extension and the surge tank 5 adjacent to each other are joined and joined to each other with positive pressure, the positioning protrusion 15 and the welding rib 13a of the lower piece 4 are located between the passage extension to prevent stress concentration. It can be reduced and the bonding strength can be made sufficiently high.

(2) In this embodiment, the positioning protrusion 1
No. 5 was located between the circular arc parts 10 adjacent to each other. Therefore, when it is located between the arcuate portions 10 adjacent to each other,
When the passage extending portion including the arcuate portions 10 adjacent to each other and the surge tank 5 have a positive pressure, the positioning protrusion 15 is located between the passage extending portions, so that stress concentration can be reduced and the joint strength can be sufficiently increased. be able to.

(3) In this embodiment, the arcuate portion (first passage extension forming portion) 10 of the inner piece 3 is formed in a semi-arc shape in cross section, and the arc portion of the lower piece 4 (second passage extension forming portion). 9) was formed in a semi-circular shape in cross section. As a result, the passage extending portion has a circular cross section. The effects of (1) and (2) above can be realized in the passage extending portion having a circular cross section.

(4) In the present embodiment, the positioning projection 15 which also serves as the welding rib is provided with the extension 13a of the lower piece 4.
It was placed on the extension line of. As a result, between the arc portions 10,
Positioning protrusion 15 which also serves as the extension portion 13a and the welding rib.
However, since they are arranged, the stress concentration can be reduced and the joint strength can be increased.

Further, the space between the adjacent passage extending portions can be obtained as the minimum necessary port pitch for obtaining the bonding strength. Even if it is embodied as follows, substantially the same operational effects as those of the above-described embodiment can be obtained.

(1) In the above embodiment, the arcuate portion 9 and the arcuate portion 10 forming the passage extending portion are provided.
Even if it is formed in a U-shaped cross-section instead of 10, or is formed in a half-divided shape in which an ellipse is divided by the long axis or the short axis, the same effects as (1) to (4) of the above-described embodiment can be obtained. Play.

(2) In the above embodiment, the positioning protrusion 1
Although 5 is arranged on the extension line of the extension portion 13b of the welding rib 13, it may be at an offset position. Even when offsetting, it is preferable that the offset amount is small in order to reduce the port pitch.

(3) Instead of the positioning hole 16 penetrating the positioning protrusion 15 of the above embodiment, the positioning protrusion 15 is used.
You may form in the positioning groove which can penetrate. This positioning groove has a groove shape with the mating surface R2 side open in FIG.

Although the respective embodiments of the present invention have been described above, the technical ideas that can be grasped from the above embodiments will be described below together with their effects. (1) The resin intake manifold according to any one of claims 1 to 5, wherein the positioning fitting portion is a through groove that penetrates the positioning protrusion. Also by doing so, the effects (1) to (4) of the above embodiment can be obtained. In addition, in (3) of other embodiment,
The positioning groove constitutes a through groove.

[0058]

As described above in detail, according to the inventions of claims 1 to 6, it is possible to improve the joint strength between the upper piece and the lower piece without widening the port pitch. You can

According to the second aspect of the present invention, since the positioning convex portion is located between the passage extending portions which are adjacent to each other, stress concentration is prevented when the passage extending portion and the surge tank which are adjacent to each other have a positive pressure. It can be reduced and the bonding strength can be made sufficiently high.

According to the third aspect of the invention, the first passage extension forming portion of the intermediate component is formed in a semicircular cross section,
Since the second passage extension forming portion of the second component is formed in a semicircular arc shape in cross section, the passage extension portion has a circular cross section, and the passage extension portion having the circular cross section has the first or second aspect. The action of can be realized.

According to the fourth aspect of the invention, the adhesive rib of the second component and the positioning convex portion that also serves as the adhesive rib are:
By welding and joining the first component, the first component and the second component can be firmly joined and connected.

According to the fifth aspect of the present invention, the positioning convex portion that also serves as the adhesive rib of the intermediate component is located on the extension line of the adhesive rib of the second component, so that the adjacent passage extending portions are joined together. It is possible to obtain the minimum required port pitch for obtaining strength.

According to the sixth aspect of the present invention, the positioning protrusion can be fitted in the through hole as the positioning fitting part for positioning.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an intake manifold according to an embodiment.

FIG. 2 is a perspective view of the intake manifold of the same.

FIG. 3 is a plan view showing how the lower piece and the inner piece of the intake manifold are connected together.

FIG. 4 is an exploded plan view before assembling the lower piece and the inner piece.

5 is a sectional view taken along line CC of FIG.

FIG. 6 is an enlarged plan view showing a connection structure between the lower piece and the inner piece.

7 is a cross-sectional view taken along line DD of FIG.

FIG. 8 is an exploded plan view of a conventional lower piece and inner piece before being assembled.

9 is a sectional view taken along line BB of FIG.

FIG. 10 is an enlarged plan view showing a conventional connecting structure of a lower piece and an inner piece.

11 is a cross-sectional view taken along the line AA of FIG.

FIG. 12 is a plan view showing a connected state of a lower piece and an inner piece of a conventional intake manifold.

[Explanation of symbols]

1 ... Intake manifold, 2 ... Upper piece (constituting the first part), 3 ... Inner piece (constituting the intermediate part), 4 ... Lower piece (constituting the second part), 6 ... Intake passage Forming part, 9 ... Arc part (constituting the second passage extension forming part), 10 ... Arc part (constituting the first passage extending forming part), 13 ... Welding rib (constituting an adhesive rib). ), 13a ... Extensions, 15 ... Positioning projections (constituting positioning projections), 16 ... Positioning holes (constituting positioning fittings), 19 ... Joining ends, R1, R2
…Mating face.

Claims (6)

(57) [Claims] 1. A surge tank is integrally formed of a first part, a second part connected to the first part, and an intermediate part provided between the first part and the second part, A plurality of intake pipe passages are formed in the first component, and the intermediate component is arranged in the second component and is connected to the plurality of intake pipe passages in cooperation with the second component. In a resin intake manifold forming a passage extending portion, a plurality of first passage extending forming portions are continuously formed in the intermediate component, and a second passage extending forming portion of the intermediate component is formed of the intermediate component. A plurality of the first passage extension forming portions are continuously formed, and the second component and the intermediate component are joined together with the corresponding passage extension forming portions facing each other. A plurality of passage extending portions are configured, and the second component includes a front portion. Adhesive ribs for joining to the first component are provided, and a positioning projection that also serves as an adhesive rib is formed on a joint end face of the second component extending from the second passage extension forming portion with the first component. A resin-made intake manifold, wherein a positioning fitting portion that allows the positioning convex portion to penetrate is provided on a joint end surface side of the first passage extension forming portion of the intermediate component with the first component. 2. The positioning protrusion is located between the passage extensions adjacent to each other.
The resin intake manifold described in. 3. The first passage extension forming portion of the intermediate component is formed to have a semicircular arc cross section, and the second passage extension forming portion of the second component is formed to have a semicircular arc cross section. The resin intake manifold according to claim 1 or 2. 4. The adhesive rib of the second component and the positioning projection that also serves as the adhesive rib are welded and joined to the first component. Resin intake manifold. 5. The resin intake according to claim 1, wherein the positioning protrusion that also serves as the adhesive rib is located on an extension line of the adhesive rib of the second component. Manifold. 6. The resin intake manifold according to claim 1, wherein the positioning fitting portion is a through hole that penetrates the positioning convex portion.