JP2008111415A - Intake manifold joint structure - Google Patents

Abstract

A plurality of intake pipes of an intake manifold are each composed of a pair of upper and lower synthetic resin divided bodies, and when the divided bodies are brought into contact with each other by an abutting flange portion formed on the divided surface, they are adjacent to each other. Even when the matching intake pipes are close to each other, the width of the abutting flange portion is secured, and the abutting flange portions of the respective divided bodies are relatively closely attached to each other.
The abutting flange portions 21 and 41 of the lower divided bodies 20 and 40 are connected to each other at locations where the first intake pipe A and the second intake pipe B adjacent to each other are very close to each other. A flange portion 81 is formed, and the abutting flange portions 11 and 31 of the upper divided bodies 10 and 30 are disposed with a predetermined first gap T1 therebetween. The connecting flange portion 81 has a first gap T1. A pair of lower protrusions Q1, Q2 are provided across a second gap T2, which is larger than the first gap T1, and the abutting flange portions 11, 31 of the upper divided bodies 10, 30 are larger than the first gap T1. Upper protrusions P1 and P2 are formed across a third gap T3 that is smaller than T2.
[Selection] Figure 7

Description

  The present invention relates to an intake manifold comprising a pair of divided bodies each comprising an intake volume portion and a plurality of synthetic resin intake pipes, each intake pipe being divided by a dividing surface substantially along its axis. The present invention relates to an intake manifold joining structure in which bodies are joined together by abutting flange portions formed on respective divided surfaces and welded.

  2. Description of the Related Art Conventionally, an intake manifold attached to an engine of a vehicle such as an automobile has a plurality of intake volume portions communicating with an intake air supply source, and an intake passage having one end communicating with the intake volume portion and the other end communicating with a cylinder of the engine. Each intake pipe is divided into a pair of divided bodies (a first divided body and a second divided body) at a divided surface substantially along the axis, and the two divided bodies are separated from each other. It is known that the abutting flange portions formed on the respective divided surfaces are abutted and welded by, for example, a vibration welding method (see, for example, Patent Document 1).

When such intake manifold synthetic resin segments are abutted and joined at the abutting flange portion, the abutment portion of the low stiffness (lower stiffness) segment is highly rigid (high stiffness) The low-rigidity divided body is welded and joined in a state where the low-rigidity divided body is pressed and deformed so as to be in close contact with the abutting portion of the divided body.
In order to avoid surplus welding resin from leaking to the outside and causing appearance defects as welding burrs during this welding and joining, usually at least one of the abutting portions of the divided body has a surplus. A resin reservoir for capturing the welding resin is formed.

By the way, in relation to the size and shape of the intake manifold, with the space saving of the engine room, the intake manifold has a required length of the intake passage, or a plurality of intake passages. Is required to be as compact as possible, and the cross-sectional shape of the intake passage is maintained as close to a circle as possible. For this reason, the shape of the intake pipe is also required to be changed from a relatively straight straight pipe to a bent pipe having a curved portion.
JP 2002-364470 A

In particular, as the distance between the intake volume (surge tank) and the cylinder head of the engine becomes narrower, the shape of the intake pipe (curved pipe) becomes more complex, and adjacent ones of the multiple intake pipes are very An approaching point may occur.
In such a place where adjacent intake pipes are very close to each other, it is difficult to secure a sufficient width of the abutting flange portion of each divided body of the intake pipe, and the welded joint of the divided bodies is stable. This is disadvantageous in obtaining high strength.

For this reason, it is conceivable to secure a flange width at a location where adjacent intake pipes are very close to each other by integrally connecting the abutting flange portions of the divided bodies of the intake pipes.
However, when the abutting flanges are connected together for both of the divided bodies, both of the divided bodies have high rigidity. Therefore, when the divided bodies are welded together, one (low-rigidity) division is used. Even if the body is deformed under pressure, it becomes difficult to make the abutting part sufficiently adhere along the abutting part of the other (high rigidity) divided body, resulting in insufficient welding strength or difficulty in welding and joining. There was a problem.

  In view of this, the present invention relates to an intake manifold that includes an intake volume portion and a plurality of synthetic resin intake pipes, each intake pipe being divided by a dividing surface substantially along the axis thereof, and a pair of divided bodies. When the divided bodies are abutted and welded at the abutting flange portions formed on the respective dividing surfaces, the width of the abutting flange portion is effectively secured even when adjacent intake pipes are close to each other. In addition, the basic object is to make it possible to relatively easily abut the abutting flange portions of the respective divided bodies.

For this reason, the intake manifold joint structure according to the present invention comprises an intake volume portion communicating with an intake air supply source, and a plurality of synthetic resin intake ports having one end connected to the intake volume portion and the other end connected to an engine cylinder. An intake manifold having a first divided body and a second divided body in which each intake pipe is divided by a dividing surface substantially along the pipe axis. It is a joint structure of an intake manifold formed by abutting two split bodies at the abutting flange portion formed on each split surface and welding and joining them.
At least a part of the abutting flange portion of the first divided body of the first intake pipe is connected to at least a part of the abutting flange of the first divided body of the second intake pipe adjacent to the first intake pipe. A connecting flange is formed,
At a portion facing the connecting flange portion, at least a part of the abutting flange portion of the second divided body of the first intake pipe and at least a portion of the abutting flange portion of the second divided body of the second intake pipe. Are arranged with a predetermined first gap therebetween,
The connecting flange portion includes a pair of partition walls formed at both ends in the width direction, and a pair of first protrusions disposed between the partition walls with a second gap larger than the first gap. And is provided with
The at least one part of the abutting flange portion of the second divided body of the first intake pipe and the at least a part of the abutting flange portion of the second divided body of the second intake pipe have an abutting flange of the first divided body. And a second projecting portion facing the first projecting portion with a third gap larger than the first gap and smaller than the second gap in the abutting state of the abutting flange portion of the second divided body Are formed,
By welding the first projecting portion and the second projecting portion, the first divided body and the second divided body are joined at the abutting flange portion.
It is characterized by that.

  In this case, the second projecting portion is formed at each end of each abutting flange portion, and the depth position of the flange surface between the first projecting portions facing the second projecting portion, respectively. Is preferably set deeper than the depth position of the flange surface between the first protrusion and the partition wall.

  Further, in the above case, the first divided body has one end formed integrally with the intake volume portion and the other end formed integrally with a mounting member for a cylinder of the engine. It is more preferable that the rigidity is set high.

According to the joint structure of the intake manifold according to the present invention, at least a part of the abutting flange of each first divided body is connected to each other for the first intake pipe and the second intake pipe that are adjacent to each other to form a connection flange portion. In addition, at least a part of the abutting flange of each second divided body is disposed with a predetermined first gap therebetween. Therefore, even when the first intake pipe and the second intake pipe are close to each other, it is possible to effectively secure the width of the abutting flange portion, which is disadvantageous in obtaining a stable high strength. Can be avoided.
In addition, the abutting flanges are connected to each other for each of the first divided bodies, but at least a part of the abutting flange is separated by separating the first gaps for each of the second divided bodies. . Accordingly, it is possible to prevent the rigidity of the second divided body from being inadvertently increased. When the divided bodies are welded to each other, the second divided body is subjected to pressure deformation so that the abutting flange portion is formed. It becomes easy to fully adhere | attach along the abutting flange part of a 1st division body, and it can avoid that the welding joining operation becomes difficult too much. Moreover, sufficient welding strength can be secured.
In addition, a resin is formed between the second gap between the pair of first protrusions of the connecting flange part and the third gap between the second protrusions of the second divided bodies of the first and second intake pipes. A reservoir can be formed, and the first gap for communicating the resin reservoir with the outside is the smallest among the first, second, and third gaps. Accordingly, it is possible to effectively restrict the excess welding resin accumulated in the resin reservoir from leaking to the outside, and to suppress appearance defects as welding burrs.

  In this case, preferably, the depth position of the flange surface between the first protrusions facing the second protrusions is the depth of the flange surface between the second protrusions and the partition wall. Even when the first and second intake pipes are made closer to each other by forming the second protrusions at the ends of the respective abutting flanges by being set deeper than the position. It is possible to secure a sufficient space for the pool.

  In the above case, more preferably, the first divided body has one end formed integrally with the intake volume portion and the other end formed integrally with a mounting member for a cylinder of the engine. Since the rigidity is set to be higher than that of the two divided bodies, it is possible to prevent the rigidity of the second divided body, which is originally low rigidity, from being inadvertently increased. By pressurizing and deforming the second divided body, it is possible to make the abutting flange portion easily adhere sufficiently along the abutting flange portion of the first divided body, which is inherently highly rigid.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is an overall perspective view of an intake manifold according to an embodiment of the present invention. FIG. 2 is a perspective view showing an upper divided body (second divided body) of the intake manifold as viewed from above (on the side opposite to the divided surface). 3 is a perspective view showing the lower divided body (first divided body) of the intake manifold as viewed from below (divided surface side).

  As shown in these drawings, an intake manifold M according to the present embodiment includes a surge tank 1 as an intake volume communicating with an intake air supply source, one end connected to the surge tank 1 and the other end of an engine cylinder ( A plurality of (three in this embodiment) synthetic resin first, second, and third intake pipes A, B, and C connected to each other (not shown). The other ends of these intake pipes A, B, and C are preferably coupled to the cylinder side of the engine via a synthetic resin mounting flange 5. The mounting flange 5 is a horizontally long single body common to all the intake pipes A, B, and C, and includes a plurality of bolt insertion holes 5h through which mounting bolts (not shown) to the engine are inserted.

Each of the intake pipes A, B, and C is configured to have a curved portion that is curved so as to bulge upward in order to ensure the required length of the intake passage even in a relatively small installation space. Yes.
The surge tank 1 is a horizontally long single body common to all the intake pipes A, B and C, preferably made of synthetic resin, and the upper half 2 and the lower half 3 are joined by welding, for example. And integrated.

  In the present embodiment, the intake pipes A, B, and C are vertically moved along a dividing plane substantially along the axis lines La, Lb, and Lc (see FIGS. 6, 7, and 8 to be described later) of the intake pipes A, B, and C. It is composed of (first, second and third) upper divided bodies 10, 30, 50 and (lower, first, second and third) lower divided bodies 20, 40, 60, The upper divided bodies 10, 30, 50 and the lower divided bodies 20, 40, 60 are brought into contact with each other at the abutting flange portions 11, 31, 51 and 21, 41, 61 formed on the divided surfaces. In a state where the flanges 11, 31, 51 and 21, 41, 61 are pressed from above and below through a jig (not shown) from the back side, for example, using a vibration welding method, the two divided bodies are joined at the abutting portion. Weld and join. Thereby, an integral intake manifold M is obtained.

  The upper divided bodies 10, 30, 50 of the intake pipes A, B, C are integrally formed with the upper half 2 of the surge tank 1, while the other ends are free. Further, the lower divided bodies 20, 40, 60 of the intake pipes A, B, C are integrally formed with the lower half 3 of the surge tank 1 at one end and integrally formed with the mounting flange 5 at the other end. Has been. Accordingly, the lower divided bodies 20, 40, 60 are higher in rigidity than the upper divided bodies 10, 30, 50, respectively.

  When the upper divided bodies 10, 30, 50 and the lower divided bodies 20, 40, 60 of the intake pipes A, B, C are abutted and joined at the abutting flange portion, the rigidity is low (the one with the lower rigidity). Low rigidity upper division so that the abutting flange portions of the upper divided bodies 10, 30, 50 are in close contact with the high rigidity (higher rigidity) lower dividing bodies 20, 40, 60. The welding joining is performed in a state where the bodies 10, 30, and 50 are deformed under pressure.

  In the present embodiment, because the distance between the surge tank 1 and the cylinder head of the engine is particularly narrow, the bent shape of the intake pipes A, B, C is more complicated, and the three intake pipes A, B , C, the adjacent first and second intake pipes A, B are partially very close to each other. And about the location where the intake pipes A and B which adjoin each other like this approach, the abutting flange portions 11 and 31 of the upper and lower divided bodies 10 and 30 and 20 and 40 of the intake pipes A and B, respectively. And it becomes difficult to ensure sufficient widths of 21, 41.

  Therefore, with respect to the adjacent first and second intake pipes A and B, the widths of the abutting flange portions 11 and 31 and 21 and 41 are sufficiently secured even at locations where both A and B are very close to each other. In addition, in order to prevent the rigidity of the upper divided bodies 10 and 30 from being inadvertently increased, in the present embodiment, the abutting flange portion of the lower divided bodies 20 and 40 of the intake pipes A and B is used. 21 and 41 are connected to each other to form a connecting flange 81. The upper split bodies 10 and 30 are separated by the abutting flange portions 11 and 31 separating a predetermined gap T1 (first gap). I tried to do it.

  4 is a perspective view showing an example of a cross-sectional structure of the upper divided bodies 10 and 30 of the first and second intake pipes A and B. FIG. 5 is a lower divided body 20 of the first and second intake pipes A and B. , 40 is a perspective view showing an example of a cross-sectional structure. FIG. 6 shows a cross-sectional shape of the first and second intake pipes A and B where the two intake pipes A and B are not so close to each other, and is a longitudinal cross-sectional explanatory view taken along line Y6-Y6 in FIG. FIG. 7 shows a cross-sectional shape of the first and second intake pipes A and B where they are very close to each other, and is a longitudinal cross-sectional explanatory view taken along line Y7-Y7 in FIG. Further, FIG. 8 shows a cross-sectional shape of the third intake pipe C, and is a longitudinal cross-sectional explanatory view taken along line Y8-Y8 in FIG.

  As can be seen from FIGS. 6 and 8, the cross-sectional shapes of the intake pipes A, B, and C are basically the same as long as the intake pipes are not particularly close to each other. That is, each of the abutting flange portions 21, 41, 61 of the lower divided bodies 20, 40, 60 is formed with a pair of partition walls K1, K2 extending upward at both ends in the width direction. A first protruding portion Q (hereinafter referred to as a lower protruding portion) that protrudes upward is formed at a substantially intermediate position between the walls K1 and K2. On the other hand, each of the abutting flange portions 11, 31, 51 of the upper divided bodies 10, 30, 50 has a second projecting portion projecting downward at a position facing the lower projecting portion Q in the abutting state. P (hereinafter referred to as an upper protrusion) is formed.

  By colliding the abutting flange portions 11, 31, 51 of the upper divided bodies 10, 30, 50 and the abutting flange portions 21, 41, 61 of the lower divided bodies 20, 40, 60, an upper protruding shape is obtained. The part P and the lower projecting part Q are faced up and down, the tip parts are melted, and both are welded and joined (welded part W). At this time, space portions J1 and J2 that function as a resin reservoir are formed between the partition walls K1 and K2 and the upper and lower protrusions P and Q.

  On the other hand, when the intake pipes A and B are very close to each other, as shown in FIGS. 4, 5, and 7, a part of the abutting flange portion 21 of the lower divided body 20 of the first intake pipe A is provided. And a part of the abutting flange portion 41 of the lower split body 40 of the second intake pipe B adjacent to the first intake pipe A is connected to form a connection flange portion 81. Further, at a portion facing the connecting flange portion 81, a part of the abutting flange portion 11 of the upper divided body 10 of the first intake pipe A and an abutting flange portion 31 of the upper divided body 30 of the second intake pipe B are provided. Are disposed with a predetermined first gap T1 therebetween. Note that the side surfaces of the abutting flange portions 11 and 31 that form the first gap T1 are inclined surfaces that are slightly inclined toward the outside, and the first gap T1 gradually increases as it goes upward. It is formed to spread.

  In this way, the abutting flange portions 21 and 41 of the respective lower divided bodies 20 and 40 are connected and connected at locations where the first intake pipe A and the second intake pipe B adjacent to each other are very close to each other. A flange portion 81 is formed, and the abutting flange portions 11 and 31 of the upper divided bodies 10 and 30 are arranged with a predetermined first gap T1 therebetween. Therefore, even when the first intake pipe A and the second intake pipe B are close to each other, it is possible to effectively secure the width of the abutting flange portion, which is disadvantageous in obtaining high strength stably. Can be avoided.

  Further, one end is integrally formed with the lower half 3 of the surge tank 1 and the other end is integrally formed with the mounting flange 5, so that the lower divided body is inherently higher in rigidity than the upper divided bodies 10 and 30. 20 and 40, the abutting flange portions 21 and 41 are connected to each other. However, for the upper divided bodies 10 and 30 that are inherently low in rigidity, the abutting flange portions 11 and 31 separate the first gap T1. It is separated. Therefore, it is possible to prevent the upper divided bodies 10 and 30 from being inadvertently increased in rigidity. When the upper and lower divided bodies 10, 30 and 20, 40 are welded together, the lower divided upper divided body 10 is used. , 30 is easily deformed under pressure, so that the abutting flange portions 11, 31 can be sufficiently brought into close contact with the abutting flange portions 21, 41 of the high-rigidity lower divided bodies 20, 40, so that the welding and joining work can be performed. Avoid being overly difficult. Moreover, the welding strength can be sufficiently secured.

As shown in detail in FIG. 10, the connecting flange portion 81 has a second gap T2 larger than the first gap T1 between the pair of partition wall portions K2 and K2 located at both ends in the width direction. A pair of lower projections Q1, Q2 is provided.
Further, a part of the abutting flange portion 11 of the upper split body 10 of the first intake pipe A and a part of the abutting flange 31 of the upper split body 30 of the second intake pipe B are in the abutting state in the first state. Upper protrusions P1 and P2 that face the lower protrusions Q1 and Q2 are formed across a third gap T3 that is larger than one gap T1 and smaller than the second gap T2.

  The upper projecting parts P1, P2 and the lower projecting parts are brought into contact with each other by bringing the abutting flange parts 11, 31 of the upper divided bodies 10, 30 into contact with the abutting flange parts 21, 41 of the lower divided bodies 20, 40. The shape portions Q1 and Q2 are abutted up and down, the tip portions are melted, and both are welded and joined (welded portions W1 and W2). At this time, between the partition wall K2 and the upper and lower protrusions P1, Q1, between the protrusions P1, Q1 and the protrusions P2, Q2, and between the partition wall K2 and the upper and lower protrusions P2, Q2. The space portions J3, J4, and J5 (first, second, and third resin reservoirs) that respectively function as resin reservoirs are formed.

  In other words, the central second resin reservoir J4 is formed by a second gap T2 between the pair of lower protrusions Q1 and Q2 and a third gap T3 between the pair of upper protrusions P1 and P2. The resin reservoir J4 is formed and communicates with the outside through the first gap T1. However, the first gap T1 is set to be the smallest among the first, second, and third gaps T1, T2, and T3. In particular, excess resin that can be generated during welding is generated from the second resin pool J4. When overflowing and leaking, it acts as an orifice that regulates the flow, and it is set as small as possible within a range that does not impair the deformability of the upper divided bodies 10 and 30 (width is about 1 mm). The

  As described above, the second gap T2 between the pair of lower protrusions Q1 and Q2 of the connecting flange part 81 and the third gap T3 between the upper protrusions P1 and P2 of the upper divided bodies 10 and 30 are provided. Thus, the second resin reservoir J4 can be formed, and the first gap T1 that allows the second resin reservoir J2 to communicate with the outside is the largest among the first, second, and third gaps T1, T2, and T3. It is getting smaller. Therefore, it is possible to effectively restrict the excess welding resin accumulated in the second resin reservoir J4 from leaking to the outside, and to suppress appearance defects as welding burrs.

  As for the abutting portion outside the first intake pipe A and the second intake pipe B (opposite to the connecting flange portion 81), as shown in FIG. It has the same cross-sectional shape as when the tubes are not particularly close to each other.

  FIG. 11 is an enlarged longitudinal sectional view showing the cross-sectional shape of the abutting portion including the connecting flange portion of the first and second intake pipes according to a modification of the above-described embodiment (the embodiment shown in FIGS. 1 to 10). It is surface explanatory drawing. In the description of this modification, the same components as those in the above-described embodiment are denoted by the same reference numerals, and further description thereof is omitted.

  In this modification, in order to bring the first and second intake pipes A and B closer together, the upper protrusions P3 and P4 are provided at the terminals of the abutting flange portions 11 and 31 of the upper divided bodies 10 and 30, respectively. The depth position E2 of the flange surface F2 (for example, the depth position from the upper end of the partition wall K2) between the lower protrusions Q3 and Q4 respectively formed and opposed to the upper protrusions P3 and P4, respectively. ) Is set deeper than the depth position E1 of the flange surface F1 between the lower protrusions Q3 and Q4 and the partition wall portions K2 and K2.

  Therefore, even when the upper protrusions P3 and P4 are formed at the ends of the respective abutting flange portions 11 and 31, respectively, even when the first and second intake pipes A and B are brought closer to each other, the second resin A sufficient space for the pool J4 can be secured.

  Needless to say, the present invention is not limited to the above embodiments, and various changes and modifications can be made without departing from the scope of the present invention.

  The present invention relates to an intake manifold comprising a pair of divided bodies each having an intake volume portion and a plurality of synthetic resin intake pipes, each of which is divided by a dividing surface substantially along its axis. The present invention relates to a joint structure of an intake manifold formed by abutting each other at an abutting flange portion formed on each divided surface and welding and joining, and an abutting flange portion formed on each divided surface. Even when adjacent intake pipes are close to each other and welded together, the width of the abutting flange portion is effectively secured, and the abutting flange portions of each divided body are relatively easy. It can be closely attached and can be effectively used as a joint structure of an intake manifold attached to an engine of a vehicle such as an automobile.

1 is an overall perspective view of an intake manifold according to an embodiment of the present invention. It is a perspective view from the upper part of the upper side division body of the said intake manifold. It is a perspective view from the lower part of the lower side division body of the said intake manifold. It is a perspective view which shows an example of the cross-section of the upper division body of the 1st, 2nd intake pipe of the said intake manifold. It is a perspective view which shows an example of the cross-section of the lower division body of the said 1st, 2nd intake pipe. It is a figure which shows both cross-sectional shape in the location where the said 1st, 2nd intake pipe is not approaching so much, and is longitudinal cross-sectional explanatory drawing along the Y6-Y6 line | wire in FIG. It is a figure which shows both the cross-sectional shape in the location where the said 1st, 2nd intake pipes approach very much, and is longitudinal cross-sectional explanatory drawing along the Y7-Y7 line | wire in FIG. It is a figure which shows the cross-sectional shape of the 3rd intake pipe of the said intake manifold, and is longitudinal cross-sectional explanatory drawing along the Y8-Y8 line | wire in FIG. FIG. 6 is an explanatory longitudinal sectional view showing an enlarged cross-sectional shape of an abutting portion outside the first intake pipe. It is a longitudinal cross-sectional explanatory drawing which expands and shows the cross-sectional shape of the abutting part containing the connection flange part of the said 1st, 2nd intake pipe. It is a longitudinal cross-sectional explanatory drawing which expands and shows the cross-sectional shape of the abutting part containing the connection flange part of the 1st, 2nd intake pipe which concerns on the modification of the said embodiment.

Explanation of symbols

1 Surge tank 2 Upper half of surge tank 3 Lower half of surge tank 4 Mounting flange 10, 30, 50 Upper split 11, 31, 51 Abutting flange 20 of upper split 20 , 40, 60 Lower divided body 21, 41, 61 Abutting flange portion (of lower divided body) 81 Connecting flange portion A, B, C (first, second, third) intake pipe E1, E2 (connecting flange portion) F) Flange surface depth position F1, F2 (connection flange) flange surface J1, J2, J3, J4, J5 Resin pool K1, K2 Partition wall La, Lb, Lc Intake pipe axis M Intake manifold P, P1, P2, P3, P4 Upper protrusion (second protrusion)
Q, Q1, Q2, Q3, Q4 Lower protrusion (first protrusion)
T1 1st clearance T2 2nd clearance T3 4th clearance W welding part

Claims (3)

An intake volume portion communicating with an intake air supply source, and a plurality of synthetic resin intake pipes connected at one end to the intake volume section and connected at the other end to an engine cylinder, each intake pipe being substantially connected to the pipe axis In the intake manifold constituted by the first divided body and the second divided body that are divided by the divided surfaces along, the first and second divided bodies of the intake pipes are formed on the respective divided surfaces. It is a joint structure of an intake manifold formed by abutting and welding at a joint flange,
At least a part of the abutting flange portion of the first divided body of the first intake pipe is connected to at least a part of the abutting flange of the first divided body of the second intake pipe adjacent to the first intake pipe. A connecting flange is formed,
At a portion facing the connecting flange portion, at least a part of the abutting flange portion of the second divided body of the first intake pipe and at least a portion of the abutting flange portion of the second divided body of the second intake pipe. Are arranged with a predetermined first gap therebetween,
The connecting flange portion includes a pair of partition wall portions formed at both ends in the width direction, and a pair of first protrusions disposed between the partition wall portions with a second gap larger than the first gap therebetween. And is provided with
The at least one part of the abutting flange portion of the second divided body of the first intake pipe and the at least a part of the abutting flange portion of the second divided body of the second intake pipe have an abutting flange of the first divided body. And a second projecting portion facing the first projecting portion with a third gap larger than the first gap and smaller than the second gap in the abutting state of the abutting flange portion of the second divided body Are formed,
By welding the first projecting portion and the second projecting portion, the first divided body and the second divided body are joined at the abutting flange portion.
Intake manifold joint structure characterized by this. The second protrusions are respectively formed at the ends of the respective abutting flange portions;
The depth position of the flange surface between the first protrusions facing the second protrusions is set deeper than the depth position of the flange surface between the first protrusions and the partition wall. ing,
The joint structure of the intake manifold according to claim 1.   One end of the first divided body is formed integrally with the intake volume portion, the other end is formed integrally with a mounting member for a cylinder of the engine, and the rigidity is set higher than that of the second divided body. The intake manifold joint structure according to claim 1, wherein the intake manifold has a joint structure.

Images