JP2000179416A - Resin intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin intake manifold which prevents widening of port pitches, and improves connection strength between upper and lower pieces. SOLUTION: A surge tank of an intake manifold is prepared by connecting a resin upper piece 2 to a resin lower piece 4. The lower piece 4 is connected to an inner piece 3 while their corresponding arcuate portions are faced to each other. In order to position, a positioning projection is inserted into a positioning fitting hole 16 of the inner piece 3. At this assembling time, the positioning projection 15 serves as a depositing rib. The upper piece 2 is connected to the lower piece 4 with the inner piece 3 being housed in the lower piece 4. The positioning projection 15 of the inner piece 3 and depositing ribs 13, 13a of the lower piece 4 are connected to the upper piece 2.

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 for an automobile engine.

[0002]

2. Description of the Related Art An intake manifold of an automobile engine is used as an intake system component for supplying air to each cylinder of the engine. Conventionally, as an intake manifold, a resin intake manifold using a synthetic resin has been developed for the purpose of weight reduction or 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, each of the separately molded parts is later joined and integrated as an intake manifold.

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

[0004] Among the above-mentioned resin intake manifolds, there is known a structure in which an intake pipe is extended in a surge tank in order to improve the intake performance and the noise reduction effect. Since the extension of the intake pipe is arranged in the surge tank, it cannot be formed integrally with the intake pipe, so the extension is formed as a separate member from the intake pipe and also as a separate member from the surge tank. ing.

The surge tank has 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. It is constituted by joining. That is, when the inner piece, which is an extension of the intake pipe, is disposed in the lower piece, the upper and lower pieces are welded and joined to the upper piece when the upper and lower pieces are welded. The joint end face of the inner piece is connected to the joint end face of an intake pipe provided on the upper piece of the surge tank.

Here, an example of the connection structure of the inner piece to the lower piece will be described in detail. FIG.
FIG. 3 shows a plan view in which an inner piece 32 is arranged in a lower piece 31 of a surge tank for a four-cylinder engine.
The lower piece 31 is formed in a substantially box shape with an upper opening. The bottom wall 31a and one side wall 31 of the lower piece 31
b has a shape in which four arc portions 33 each having a semicircular cross section are continuous in the longitudinal direction. Also, the inner piece 32
Corresponding to the arc portion 33 of the lower piece 31, there is provided a corrugated portion 32a in which four arc portions 34 each having a semicircular cross section are continuously connected in the longitudinal direction. And the inner piece 32
Are arranged in the lower piece 31 so that the arc portions 34 correspond to the arc portions 33 of the lower piece 31. And
By forming the arc portions 33 and 34 of the lower piece 31 and the inner piece 32 to face each other, an extension of an intake pipe (not shown) is formed.
The space defined 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 the line BB of FIG. FIG. 10 shows the lower piece 3
FIG. 11 is an enlarged plan view showing a connection structure between the inner piece 1 and the inner piece 32, and FIG. 11 is a sectional view taken along line AA of FIG.

As shown in FIGS. 10 and 11, an upper end of the side wall 31b of the lower piece 31 is provided with a joining end 35 which is formed in a flange shape over the entire circumference, and is provided on the joining end 35. , A welding rib 36 is protruded. Further, a pair of fitting holes 37 are formed in the joint end portion 35 of the lower piece 31 at a position located between the arc portions 33 and inside the welding rib 36.

A positioning pin 38 is projected from a portion corresponding to the joint end 35 of the lower piece 31 between the arc portions 34 of the inner piece 32, and fitted into the fitting hole 37. The inner piece 32 is positioned by fitting the positioning pin 37 into the fitting hole 38.

The welding rib 36 of the lower piece 32 has
Extension portion 3 extended so as to be located between the fitting holes 38
6a are formed. As shown in FIGS. 10 and 11, in a state where the inner piece 32 is attached to the lower piece 31, the side end face 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 a semicircular cross section at the arc portions 33 and 34, so that the resin molding die cutting ( The center of the port O1
It must be located on the line L connecting O4.

The above-mentioned inner piece 32 and lower piece 3
In the connection structure 1, when a positive pressure is generated in the intake passage S and the surge tank, the extension 36a of the welding rib 36 is interposed between the intake passages S for the respective cylinders, so that stress concentration can be reduced.
Since the extension portion 36a is welded to the upper piece, there is an advantage that the joining strength (welding strength) is high.

[0013]

However, in the above-described conventional connection structure between 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 is widened. For this reason, there is a problem that the size cannot be reduced.

In comparison with the conventional example described above, for the purpose of downsizing, the extending portion 36a of the welding rib 36 is shortened only by providing a joining portion for positioning the fitting pin and the fitting hole, thereby reducing the intake passage. An intake manifold in which the distance between S is narrowed has also been proposed.

In this configuration, since the arc portions 33 and 34 are semicircular in cross section, each member is placed on the line L connecting the center O1 to O4 of the port for the reason of die cutting (molding) of resin molding. The mating surface must be located. And,
Since a fitting pin and a fitting hole are required for positioning, the extension of the welding rib cannot be longer than in the former case, and as a result, the welding rib does not exist between the intake passages. For this reason, when the intake passage and the surge tank become positive pressure,
There is a problem that a 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 joining strength between an upper piece and a lower piece without expanding a port pitch. It is intended to be.

[0017]

In order to achieve the above object, the invention according to claim 1 comprises a first component, a second component coupled to the first component, the first component and the second component. And an intermediate part provided between the first part and the first part, a plurality of intake pipe passages are formed in the first part, and the intermediate part is disposed in the second part. In a resin intake manifold that forms a plurality of passage extensions connected to the plurality of intake pipe passages in cooperation with two parts, the intermediate part is formed by a plurality of first passage extension formation parts continuously. The second component has a plurality of second passage extension forming portions corresponding to the first passage extension forming portion of the intermediate component, and the second component and the intermediate component correspond to each other. The passage extension forming portions are joined in a state where they are opposed to each other. The plurality of passage extending portions are formed, 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 convex portion also serving as an adhesive rib is formed on the joint end surface side with the component, and the positioning convex portion is allowed to penetrate the joint end surface with the first component in the first passage extension forming portion of the intermediate component. The gist of the present 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 projections include a resin intake manifold located between adjacent passage extending portions.

According to 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 cross section, and the second passage extension forming portion of the second component is formed. Is a gist of a resin intake manifold formed in a semicircular cross section.

The invention according to claim 4 is the invention according to claims 1 to 3.
In any one of the above aspects, the bonding rib of the second component and the positioning projection that also serves as the bonding rib have a gist of a resin intake manifold welded and bonded to the first component.

According to a fifth aspect of the present invention, there is provided the first to fourth aspects.
In any one of the above aspects, the positioning protrusion serving also as the bonding rib of the intermediate component has a gist of a resin intake manifold located on an extension of the bonding rib of the second component.

The invention of claim 6 is the first to fifth aspects of the present invention.
In any one of the above, the positioning fitting portion,
The gist of the present invention is a resin intake manifold which is a through-hole penetrating the positioning projection.

(Operation) According to the first aspect of the present invention,
In joining the second component and the intermediate component in a state where the corresponding passage extension forming portions face each other, by penetrating the positioning fitting portion of the intermediate component with respect to the positioning projection of the second component, Position and assemble. During this assembling, the positioning projection functions as an adhesive rib. That is, the first component is joined to the second component in a state where the intermediate component is stored and arranged in the second component as described above.
Then, the positioning convex portion of the second component and the adhesive rib of the second component are joined and connected to the first component, and when the adjacent passage extending portion and the surge tank are at a positive pressure, the positioning is performed. Since the projections are provided, stress concentration is reduced, and bonding strength can be sufficiently increased.

According to the second aspect of the present invention, since the positioning projections are located between the adjacent passage extending portions, the adjacent passage extending portions and the surge tank have a positive pressure. In this case, stress concentration can be reduced, and 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 semicircular cross section, and the second passage extension forming portion of the second component is formed in a semicircular cross section. When formed,
The passage extending portion has a circular cross section. The effect of claim 1 or claim 2 can be realized in the passage extending portion having a circular cross section.

According to the fourth aspect of the present invention, the bonding rib of the second component and the positioning projection that also serves as the bonding 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 protrusion serving also as the bonding rib of the second component is located on the extension of the bonding rib of the second component, so that the gap between the adjacent passage extending portions is provided. The minimum required port pitch for obtaining the bonding strength can be obtained.

According to the sixth aspect of the present invention, the positioning protrusion can be positioned by fitting into the through hole as the positioning fitting portion.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which a resin intake manifold according to the present invention is embodied in an intake manifold of an in-line four-cylinder engine will be described in detail 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 includes an upper piece 2, an inner piece 3, and a lower piece 4. 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 part, and the lower piece 4 of the intake manifold 1 are made of a synthetic resin formed by a method such as injection molding (injection molding).

The upper piece 2 is formed in a closed box shape having an open lower part, and a semicircular concave groove (not shown) is formed on the upper surface of the upper wall of the upper piece 2 along the cylinder row direction (longitudinal direction). Are connected and arranged in a waveform. In addition, an intake passage forming member 8 is welded and joined to the upper piece 2 corresponding to each of the grooves by using a vibration welding method or the like. The intake passage forming member 8 has a configuration in which four intake passage forming portions 6 each having a semicircular arc section are connected in a waveform, and the intake passage forming member 8 is formed by a method such as injection molding (injection molding) in the same manner as the upper piece 2. It is composed of a synthetic resin molded by the above method. The upper piece 2 and the intake passage forming member 8 may be joined by an adhesive instead of the vibration welding.

Each of the intake passage forming member 8 and the upper member 2 has a semicircular concave groove formed in a corrugated shape.
The space defined is an intake pipe passage, and the intake pipe passage is connected to a cylinder of an engine (not shown).

The upper piece 2 is a first part of the present invention,
The lower piece 4 corresponds to a second part. FIG. 3 is a plan view showing a connection state between 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 a bottomed box shape with an open upper part, and the bottom surface and one side wall of the lower piece 4 are formed by a circular arc portion 9 having a semicircular cross section in the cylinder row direction. It has a continuous shape. The arc part 9 constitutes a second passage extension forming part.

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

The arc portions 9 and 10 of the lower piece 4 and the inner piece 3 are arranged to face each other,
A space defined between the arc 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. That is, the passage extending portion is connected to the lower piece 4 provided with the inner piece 3 with the upper piece 2 while being fixed to the surge tank 5.
It becomes the structure arranged in.

FIG. 4 is an exploded plan view before assembling the lower piece 4 and the inner piece 3, and FIG. 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 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, the upper end of the side wall 4 b of the lower piece 4 is provided with a joining end portion 12 formed in a flange shape over the entire circumference, and on the joining end portion 12, A welding rib 13 as an adhesive rib extends upward and protrudes. In the welding rib 13, the lower piece 4
An extended portion 13a is formed inward between each of the circular arc portions 9. A pair of circumferential ribs 14a and 14b are formed on the inner edge and the outer edge of the end surface of the joining end portion 12 so as to surround the welding rib 13. The ribs 14a,
14b is a wall for preventing the melted portion from leaking out when the welding rib 13 is welded to the lower end surface of the upper piece 2.

In the lower piece 4, a fitting plate portion 17 is formed so as to project inward between the arc portions 9.
On the upper end surface of the fitting plate portion 17, a positioning projection 15 as a positioning projection is formed at a portion located between the arc portions 9 and inside the extension 13 a of the welding rib 13. The positioning protrusion 15 is provided on the welding rib 13.
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 arc portions 10 of the inner piece 3 so as to extend in the vertical direction. The lower end piece 4 is provided on the joint end face of the joint end 19 provided on the upper part of the inner piece 3.
A positioning hole 16 as a positioning fitting portion is formed so as to correspond to the joining end portion 12 of FIG. Same positioning hole 16
Are connected to the fitting slit 18. And
The inner piece 3 is fitted with the lower piece 4
Is positioned with respect to the lower piece 4 by fitting the positioning plate 15 into the positioning hole 16. A circumferential rib 20 is formed on the periphery of the end surface of the joint end 19 of the inner piece 3, and the height of the rib 20 is adjusted so that the positioning protrusion 1 is positioned in the positioning hole 16.
5 are formed so as to have the same height as the ribs 14a and 14b when the fitting 5 is fitted.

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

In this embodiment, the arc portions 9, 10
Is formed in a semicircular cross-section, and the resin molding die-cut (mold splitting)
For this reason, the mating surface of the arc portions 9, 10 of the inner piece 3 and the lower piece 4 needs to be located on the line L connecting the centers O1 to O4 of the ports (see FIG. 3). Accordingly, in the lower piece 4, the mating surface R1 of the joint end portion 12 with the inner piece 3 is the inner surface of the inner peripheral rib 14a located between the arc portions 9, as shown in FIGS. Further, in the inner piece 3, the mating surface R <b> 2 facing the mating surface R <b> 1 of the lower piece 4 becomes 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 configured as described above will be described. As shown in FIG.
The upper piece 2, the inner piece 3, the lower piece 4, and the intake passage forming member 6 made of synthetic resin are formed by injection molding. When the molding of the members 2, 3, 4, and 6 is completed, the intake passage forming member 6 is set at a predetermined assembly position on the upper piece 2, and is welded and joined by a vibration welding method. Further, the bonding may be performed by an adhesive.

The combination of the upper piece 2 and the intake passage forming member 6 forms an intake passage pipe for each cylinder.
When the inner piece 3 is stored in the lower piece 4, the fitting plate 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. The inner piece 3
Is positioned with respect to the lower piece 4. At this time, in the lower piece 4, the mating surface R1 of the joining end portion 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). 20 outer surface) R2 are in contact with each other. As a result, since the arc portions 9 and 10 of the lower piece 4 and the inner piece 3 are disposed to face each other, 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, with the inner piece 3 attached to the lower piece 4, the inner rib 3 projects from the side wall of the upper piece 2 to the welding ribs 13, 13a and the positioning projections 15. The formed bonding end face 2a is welded and bonded. Further, the bonding may be performed by an adhesive. In this way, the passage extending portion and the intake passage tube are connected by assembling the upper piece 2 and the lower piece 4.

The intake manifold 1 assembled as described above has an extended portion 13a and a positioning projection 15 between the arc portions 9 and between the arc portions 10 at the joint portion between the upper piece 2 and the lower piece 4. Are joined to the joining portion 21 of the upper piece 4.

The positioning protrusions 15 function as welding ribs, and the positioning protrusions 15 are interposed between the passage extending portions. Therefore, when the passage extending portion of the intake manifold 1 and the surge tank 5 become positive pressure, Stress concentration can be reduced,
The joining strength can be sufficiently increased.

The above embodiment has the following features. (1) In the present embodiment, the lower piece (second part) 4 and the inner piece (intermediate part) 3 are joined with the corresponding arc portions (passage extending forming portions) 9, 10 facing each other. And the positioning protrusion (positioning convex portion) 15
Then, it was positioned and assembled by penetrating through the positioning fitting hole (positioning fitting portion) 16 of the inner piece 3. At the time of this assembling, the positioning protrusion 1
Reference numeral 5 functions as a welding rib (adhesive rib).

That is, when the upper piece (first part) is joined to the lower piece 4 in a state where the inner piece 3 is housed and arranged in the lower piece 4, the positioning projection 15 and the welding ribs 13, 13a of the lower piece 4 become , Upper piece 2
When the passage extending portion and the surge tank 5 adjacent to each other are positively pressurized, the positioning protrusion 15 and the welding rib 13a of the lower piece 4 are located between the passage extending portions to reduce stress concentration. The bonding strength can be sufficiently increased.

(2) In this embodiment, the positioning projection 1
5 is located between the arcuate portions 10 adjacent to each other. For this reason, when it is located between the arc portions 10 adjacent to each other,
When the passage extending portion including the arcuate portion 10 and the surge tank 5 adjacent to each other have a positive pressure, the positioning protrusions 15 are located between the passage extending portions, so that stress concentration can be reduced and the bonding strength can be sufficiently increased. be able to.

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

(4) In the present embodiment, the positioning projections 15 also serving as welding ribs are attached to the extension portions 13a of the lower piece 4.
It was arranged on the extension of. As a result, between the arc portions 10
Positioning projection 15 which also serves as extension portion 13a and welding rib
However, since they are arranged, stress concentration can be reduced, and bonding strength can be increased.

The port pitch between the adjacent passage extending portions can be obtained as the minimum necessary port pitch for obtaining the bonding strength. Note that, even when embodied as described below, substantially the same operation and effect as in the above-described embodiment can be obtained.

(1) In the above embodiment, the arc portions 9 and 10 constituting the passage extending portion are provided.
The same effects as in the above-described embodiments (1) to (4) can be obtained by forming the U-shape in cross section or forming the ellipse into a half-split shape obtained by dividing the ellipse by the long axis or the short axis instead of 10. Play.

(2) In the above embodiment, the positioning protrusion 1
Although 5 is arranged on the extension of the extension 13b of the welding rib 13, it may be at an offset position. Also in the case of offset, it is preferable that the offset amount is small in order to reduce the distance between the port pitches.

(3) Instead of the positioning hole 16 penetrating the positioning projection 15 of the above embodiment, the positioning projection 15
May be formed in a positioning groove that can penetrate. This positioning groove has a groove shape in which the mating surface R2 side is opened in FIG.

Although the embodiments embodying 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 penetrating the positioning protrusion. This also provides the effects (1) to (4) of the above embodiment. In (3) of other embodiments,
The positioning groove forms a through groove.

[0058]

As described in detail above, according to the first to sixth aspects of the present invention, the joint strength between the upper piece and the lower piece can be improved without increasing the port pitch. Can be.

According to the second aspect of the invention, since the positioning projections are located between the adjacent passage extending portions, stress concentration is reduced when the adjacent passage extending portions and the surge tank become positive pressure. The bonding strength can be sufficiently increased.

According to the third aspect of the present invention, the first passage extending forming portion of the intermediate part is formed in a semicircular cross section,
Since the second passage extension forming portion of the second component is formed in a semicircular cross section, the passage extension portion has a circular cross section, and in the passage extension portion having the circular cross section, the claim 1 or 2. Can be realized.

According to the fourth aspect of the present invention, the bonding rib of the second component and the positioning projection that also serves as the bonding 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 protrusion serving also as the bonding rib of the intermediate part is located on the extension of the bonding rib of the second part, so that adjacent passage extending parts are joined. The minimum required port pitch for obtaining strength can be obtained.

According to the sixth aspect of the present invention, the positioning projection can be positioned by fitting into the through hole as the positioning fitting portion.

[Brief description of the drawings]

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

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

FIG. 3 is a plan view showing a connection state between a lower piece and an inner piece of the intake manifold.

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

FIG. 5 is a sectional view taken along line CC of FIG. 4;

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

FIG. 7 is a sectional view taken along line DD of FIG. 6;

FIG. 8 is an exploded plan view before assembling a conventional lower piece and an inner piece.

FIG. 9 is a sectional view taken along line BB of FIG. 8;

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

FIG. 11 is a sectional view taken along line AA of FIG. 10;

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Intake manifold, 2 ... Upper piece (constituting 1st part), 3 ... Inner piece (constituting intermediate part), 4 ... Lower piece (constituting 2nd part), 6 ... Intake passage Forming part, 9 ... arc part (constituting the second passage extension forming part), 10 ... arc part (constituting the first passage extension forming part), 13 ... welding rib (constituting the bonding rib). ), 13a ... extended part, 15 ... positioning projection (constituting positioning protrusion), 16 ... positioning hole (constituting positioning fitting part), 19 ... joining end, R1, R2
…Mating face.

Claims (6)

[Claims] 1. A surge tank is integrally formed by a first component, a second component coupled to the first component, and an intermediate component provided between the first component and the second component. A plurality of intake pipe passages are formed in the first part, and a plurality of the intermediate parts are disposed in the second part and are connected to the plurality of intake pipe passages in cooperation with the second part. In the resin intake manifold forming the passage extending portion, the intermediate component includes a plurality of first passage extending forming portions formed continuously, and the second component includes a second passage extending forming portion formed of the intermediate component. The second part and the intermediate part are formed in a continuous manner corresponding to the first passage extension forming part, and the second part and the intermediate part are joined with the corresponding passage extension formation parts facing each other. A plurality of passage extending portions are formed, and the second part has An adhesive rib for bonding to the first component is provided, and a positioning convex portion also serving as an adhesive rib is formed on a joint end face of the second component with the first component in the second passage extension forming portion, A resin intake manifold, characterized in that a positioning fitting portion is provided on a joint end face side of the intermediate component with the first component in the first passage extension forming portion to allow the positioning projection to penetrate. 2. The positioning projection according to claim 1, wherein the positioning projection is located between adjacent passage extending portions.
The intake manifold made of resin described in 1. 3. The intermediate part has a first passage extension forming part formed in a semicircular cross section, and the second part has a second passage extension forming part formed in a semicircular arc cross section. The resin intake manifold according to claim 1 or 2. 4. The bonding component according to claim 1, wherein the bonding rib of the second component and the positioning protrusion serving also as the bonding rib are welded to the first component. Intake manifold made of resin. 5. The resin intake according to claim 1, wherein the positioning protrusion serving also as the bonding rib is located on an extension of the bonding rib of the second component. Manifold. 6. The resin intake manifold according to claim 1, wherein the positioning fitting portion is a through hole penetrating the positioning projection.