JP2013011175A - Seal structure of intake manifold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent intake air from flowing out to the downstream side by bypassing an intercooler.SOLUTION: The intercooler 5 is inserted from an intercooler insertion port 6 opened and formed in a collector part 2 of an intake manifold 1, and is fixed to the intake manifold 1 by being pressed in a guide member 7 installed on an inner wall surface 8 of the collector part 2. The guide member 7 is installed in the collector part 2 by respectively pressing projection parts 31 and 32 formed in a guide part 7 in recessed parts 29 and 30 formed on the inner wall surface 8 of the collector part 2, and is installed in the collector part 2 in a state of separating the tips of the projection parts 31 and 32 from bottom surfaces 35 and 34 of the recessed parts 29 and 30 and separating an outer peripheral surface 28 of the guide member 7 from the inner wall surface 8 of the collector part 2.

Description

  The present invention relates to a seal structure for an intake manifold, and more particularly, to a seal structure for an intercooler of an intake manifold having a built-in intercooler.

  The intake air supercharged by a turbocharger such as a turbocharger rises in the process of being compressed, but if the intake air temperature rises excessively, the charging efficiency of the intake air decreases and the output of the internal combustion engine decreases. There is a possibility that the characteristics deteriorate. Therefore, a technique for reducing the intake air temperature by a water-cooled or air-cooled intercooler and increasing the charging efficiency of the intake air is widely known.

  For example, in Patent Document 1, the gap between the heat exchange part of the intercooler and the case accommodating the heat exchange part is filled with packing so that the high-temperature intake air supercharged downstream of the intercooler is not bypassed. The configuration is disclosed.

  Patent Documents 2 and 3 disclose a configuration in which an intercooler is built in an intake manifold.

JP 2010-127143 A US Patent Application Publication No. 2007/0175617 German Patent Application Publication No. 2007030464

  However, in Patent Document 1, since the packing is affixed to the heat exchanging part of the intercooler, the packing is deteriorated when the adhesive adhering the packing to the heat exchanging part deteriorates due to superheated high-temperature intake air. There is a possibility that high temperature intake air will flow out downstream from the part where the packing has dropped and bypass the heat exchange part of the intercooler.

  In addition, since the core portion of the intercooler has a structure in which its component parts are stacked, dimensional variations are likely to occur. However, in Patent Documents 1 to 3, a configuration in which any consideration is given regarding such dimensional variations of the intercooler. However, there is a possibility that the high-temperature intake air supercharged from the gap caused by the dimensional variation of the intercooler will flow out downstream, bypassing the heat exchange part of the intercooler.

  In view of this, the present invention provides an intake manifold seal structure for an intercooler that cools the supercharged and heated intake air in the intake manifold, and the intercooler is inserted from an intercooler insertion opening formed in the intake manifold. The whole attached to the inner wall surface of the intake manifold is fixed to the intake manifold by being press-fitted into a U-shaped strip-shaped guide member, and the outer peripheral surface of the intercooler is connected to the inner peripheral surface of the guide member. The guide member is in close contact with the concave and convex fitting portion formed by a convex portion and a concave portion formed along the longitudinal direction of the guide member between the guide member and the inner wall surface of the intake manifold. It is attached to the intake manifold by mating, and the tip of the convex portion of the concave-convex fitting portion is the concave-convex fitting. Spaced from the bottom surface of the recess parts, and is characterized in that the outer peripheral surface of the guide member is attached to the intake manifold in a state of being spaced apart from the inner wall surface of the intake manifold.

  And the said uneven | corrugated fitting part may be made to be formed over the full length of the longitudinal direction of the said guide member.

  Moreover, you may form so that the convex part of the said uneven | corrugated fitting part may exhibit the cross-sectional trapezoid shape which a front end side becomes thin.

  The guide member includes a bottom wall portion, and a first side wall portion and a second side wall portion that respectively extend from both ends of the bottom wall portion. A first uneven fitting portion formed between one side wall portion and the inner wall surface of the intake manifold, and a second uneven portion formed between the second side wall portion of the guide member and the inner wall surface of the intake manifold. A fitting portion, and a third uneven fitting portion formed between a bottom wall portion of the guide member and an inner wall surface of the intake manifold, and among the first to third uneven fitting portions The at least one uneven fitting portion may be formed to be offset in the width direction of the guide member with respect to the other uneven fitting portion.

  According to the present invention, it is possible to absorb the dimensional variation of the intercooler in the concave-convex fitting portion while ensuring the sealing performance between the intercooler and the inner wall surface of the intake manifold.

1 is an exploded perspective view of an intake manifold to which the present invention is applied. 1 is an exploded perspective view of an intake manifold to which the present invention is applied. The longitudinal cross-sectional view of the intake manifold to which this invention was applied. The cross-sectional view of the intake manifold to which the present invention is applied. The perspective view of the guide member which is a component of the intake manifold to which this invention was applied. The perspective view of the guide member which is a component of the intake manifold to which this invention was applied. The principal part enlarged view of FIG. The principal part enlarged view of FIG. The principal part enlarged view of FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  1 and 2 are exploded perspective views of an intake manifold 1 to which the present invention is applied. The intake manifold 1 is made of, for example, a so-called fiber reinforced resin such as nylon (registered trademark) containing glass fiber as a reinforcing material, and has a rectangular parallelepiped collector portion 2 along the cylinder row direction and the number of cylinders of the internal combustion engine. A branch portion 3 in which a corresponding number of intake passages (not shown) are formed, and an intake introduction passage portion 4 connected to the collector portion 2 from the cylinder row direction (longitudinal direction of the collector portion 2). Yes.

  The intake manifold 1 includes an intercooler 5 built in a collector portion 2, and an intercooler 5 inserted through a rectangular intercooler insertion port 6 elongated in the cylinder row direction formed in the collector portion 2. The whole is fixed to the collector portion 2 through a U-shaped guide member 7 having a band shape. Prior to the insertion of the intercooler 5, the guide member 7 is inserted from the intercooler insertion port 6 and attached to the inner wall surface 8 of the collector portion 2.

  The intercooler insertion port 6 is closed by a lid portion 13 (described later) of the intercooler 5. Further, the space between the intercooler insertion port 6 and the lid portion 13 is sealed by a gasket 9 disposed on the outer peripheral edge of the intercooler insertion port 6 over the entire circumference.

  As shown in FIGS. 3 and 4, an intercooler upstream side intake chamber 10 and an intercooler downstream side intake chamber are placed inside the collector unit 2 by a heat exchange unit 12 (details will be described later) of the intercooler 5 inserted therein. 11 are formed.

  As described above, the intake air passage 10 is connected to the intercooler upstream intake chamber 10 from the cylinder row direction. In the intercooler downstream side intake chamber 11, one end of the number of intake paths corresponding to the number of cylinders of the internal combustion engine formed in the branch portion 3 is opened.

  As shown in FIGS. 1 to 4, the intercooler 5 includes a heat exchange section 12 having a rectangular parallelepiped shape whose outer shape is elongated along the longitudinal direction (cylinder row direction) of the collector section 2, and the heat exchange section 12. A long rectangular plate-shaped lid portion 13 is provided along the longitudinal direction (cylinder row direction) of the collector portion 2 attached to the end surface 14. The heat exchange unit 12 includes an upper end surface 14 to which the lid portion 13 is attached, both side surfaces 15 and 16 that are in close contact with the guide member 7, a lower end surface 17 that is in close contact with the guide member 7, and the intercooler upstream side intake chamber 10. When the intake air flowing in from the intake air inflow end surface 18 passes through the heat exchange section 12, the intake air inflow side end surface 18 facing the intercooler downstream air intake chamber 11. Then, the air flows out from the intake air outflow side end face 19. Both side surfaces 15 and 16 closely contacting the guide member 7 face each other in the cylinder row direction.

  The lid portion 13 is formed such that the outer peripheral edge of the heat exchanging portion 12 protrudes outward over the entire circumference from the upper end surface 14 of the heat exchange portion 12. 2 is a cooling water introduction pipe for introducing cooling water into the heat exchanging section 12, and 21 is a cooling water discharge pipe for discharging cooling water from the heat exchanging section 12.

  The guide member 7 is made of a resin material having elasticity, for example, a so-called fiber reinforced resin such as nylon (registered trademark) containing glass fiber as a reinforcing material, or an elastomeric material resistant to high temperature, and the like. 6, the elongated flat plate-like bottom wall portion 25, and the side wall portion as the elongated flat plate-like first side wall portion extending from one end of the bottom wall portion 25 so as to be orthogonal to the bottom wall portion 25. 26a and a side wall portion 26a as a second flat side wall portion extending from the other end of the bottom wall portion 25 so as to be orthogonal to the bottom wall portion 25, and the bottom wall portion 25 and the side wall portion 26a, A projecting piece 27 projecting from the end surface of the intercooler upstream side intake chamber 10 of the bottom wall 25 and the side wall portions 26a and 26b so as to be orthogonal to the end surface of the intercooler upstream side intake chamber 10 of 26b; ,have. The size of the guide member 7 is set so that it is slightly smaller than the outer dimensions of the heat exchange section 12 of the intercooler 5 to be press-fitted in consideration of the dimensional variation of the heat exchange section 12. Yes.

  As shown in FIGS. 3 to 6, the outer peripheral surfaces 28 a, 28 b, 28 c of the bottom wall portion 25 and the side wall portions 26 a, 26 b are press-fitted into recesses 29, 30 formed on the inner wall surface 8 of the collector portion 2. Protrusions 31 and 32 are formed to protrude. That is, a concave / convex fitting portion including the convex portions 31 and 32 and the concave portions 29 and 30 is formed between the guide member 7 and the inner wall surface 8 of the collector portion 2. The guide member 7 is attached to the inner wall surface 8 of the collector portion 2 by press-fitting 32 into the corresponding recesses 29 and 30 respectively. The concave / convex fitting portion includes a first concave / convex fitting portion constituted by the convex portion 32a of the side wall portion 26a and the concave portion 30a of the inner wall surface 8 of the collector portion 2, and the convex portion 32b of the side wall portion 26b and the collector portion 2 of the collector portion 2. A second concave-convex fitting portion constituted by the concave portion 30b of the inner wall surface 8, and a third concave-convex fitting portion constituted by the convex portion 31 of the bottom wall portion 25 and the concave portion 29 of the inner wall surface 8 of the collector portion 2. ,have.

  As shown in FIG. 7, the convex portion 32a formed on the side wall portion 26a has a trapezoidal cross-section where the tip end side becomes narrower, and is located in the longitudinal direction of the side wall portion 26a at a position on the intercooler downstream side intake chamber 11 side of the side wall portion 26a. It is formed continuously over the entire length. The convex part 32a is formed in the same position of the width direction of the side wall part 26a over the full length. As shown in FIG. 7, the concave portion 30a into which the convex portion 32a formed on the side wall portion 26a is press-fitted is formed in a trapezoidal cross section in which the bottom side is narrowed. As shown in FIG. 8, the convex portion 32b formed on the side wall portion 26b has a trapezoidal cross section in which the tip end side is narrowed, and is located at the position of the side wall portion 26b on the intercooler downstream side intake chamber 11 side in the longitudinal direction of the side wall portion 26b. It is formed continuously over the entire length. The convex part 32b is formed in the same position of the width direction of the side wall part 26b over the full length. As shown in FIG. 8, the concave portion 30b into which the convex portion 32b formed on the side wall portion 26b is press-fitted is formed in a trapezoidal cross section in which the bottom side is narrowed. As shown in FIG. 9, the convex portion 31 formed on the bottom wall portion 25 has a rectangular cross section and is located at the position of the bottom wall portion 25 on the intercooler upstream side intake chamber 10 side in the longitudinal direction of the bottom wall portion 25. It is formed continuously over its entire length. The convex portion 31 is formed at the same position in the width direction of the bottom wall portion 25 over the entire length. The concave portion 29 into which the convex portion 31 formed on the bottom wall portion 25 is press-fitted is formed in a rectangular cross section as shown in FIG.

  That is, the convex portions 32a and 32b of the side wall portions 26a and 26b and the convex portion 31 of the bottom wall portion 25 are defined by the width direction of the bottom wall portion 25 and the side wall portions 26a and 26b (the vertical direction in FIG. Direction), that is, at positions offset from each other in the width direction of the guide member 7. Moreover, the convex part 32a and the convex part 32b are formed so that the position in the width direction of the guide member 7 may mutually correspond. In other words, the third uneven fitting portion is formed to be offset in the width direction of the guide member 7 with respect to the first uneven fitting portion and the second uneven fitting portion.

  When the guide member 7 is attached to the inner wall surface 8 of the collector part 2, the outer peripheral surface 28 of the guide member 7 is separated from the inner wall surface 8 of the collector part 2 as shown in FIGS. 7 to 9. And the front-end | tip of the convex part 32 of the side wall part 26 and the front-end | tip of the convex part 31 of the bottom wall part 25 will be in the state spaced apart with respect to the bottom surfaces 34 and 35 of the recessed part 30 and 29 of the inner wall surface 8 of the collector part 2, respectively. ing.

  Specifically, the outer peripheral surface 28a of the side wall portion 26a has a portion C1 that is closest to the inner wall surface 8 of the collector portion 2 is separated from the inner wall surface 8 by a predetermined amount (length) C1, and the convex portion 32a of the side wall portion 26a The tip is separated from the bottom surface 34a of the corresponding recess 30a by a predetermined amount (length) C1 or more. The outer peripheral surface 28b of the side wall portion 26b is spaced apart from the inner wall surface 8 by a predetermined amount (length) C2 with respect to the inner wall surface 8 of the collector portion 2, and the tip of the convex portion 32b of the side wall portion 26b is The recessed portion 30b is spaced from the bottom surface 34b by a predetermined amount (length) C2 or more. The outer peripheral surface 28c of the bottom wall portion 25 is such that the portion closest to the inner wall surface 8 of the collector portion 2 is separated by a predetermined amount (length) C3 from the inner wall surface 8, and the tip of the convex portion 31 of the bottom wall portion 25 is A predetermined amount (length) C3 or more from the bottom surface 35 of the corresponding recess 29.

  That is, the guide member 7 attached to the inner wall surface 8 of the collector part 2 can further press the protrusions 31 and 32 into the recesses 29 and 30 of the collector part 2 by a predetermined amount C from this state. ing. That is, the uneven fitting portion formed between the guide member 7 and the inner wall surface 8 of the collector portion 2 can absorb the dimensional variation of the heat exchange portion 12 of the intercooler 5 press-fitted into the guide member 7. A variation absorption allowance for a predetermined amount C is provided.

  In the present embodiment, C1 is formed between the side wall portion 26a and the inner wall surface 8 of the collector portion 2, C2 is formed between the side wall portion 26b and the inner wall surface 8 of the collector portion 2, and the inner wall surfaces of the bottom wall portion 25 and the collector portion 2 are. 8, the C3 variation absorption allowance is set, and in the longitudinal direction of the heat exchanging portion 12, the length variation of (C1 + C2) can be absorbed.

  Further, of the bowl-shaped protruding pieces 27 that are formed to protrude from the bottom wall portion 25 and the side wall portions 26 a and 26 b, the side wall portion 26 a that is located on the connection portion side between the intercooler upstream side intake chamber 10 and the intake air introduction passage portion 4. The protruding piece 27a formed on the side of the heat exchanger 12 overlaps with the intake inflow side end face 18 of the heat exchanging portion 12 relatively larger than the protruding piece 27c formed on the bottom wall portion 25 and the protruding piece 27b formed on the side wall portion 26b. Thus, it is formed so as to extend greatly along the intake inflow side end surface 18 from the side wall portion 26a.

  In the present embodiment, the extending wall 37 extending from the connecting portion between the intercooler upstream side intake chamber 10 and the intake air introduction passage portion 4 is provided so as to cover the protruding piece 27a formed on the side wall portion 26a. Inflow of intake air to the press-fitted portion between the convex portion 32a of the guide member 7 and the concave portion 30a of the inner wall surface 8 of the collector portion 2 on the upstream side, that is, on the upstream side, is suppressed. It is the composition which becomes.

  In the intake manifold 1 configured as described above, the guide member 7 into which the heat exchanging portion 12 of the intercooler 5 is press-fitted has the convex portions 31 and 32 on the guide member 7 side as the concave portion on the inner wall surface 8 side of the collector portion 2. Since it is fixed with respect to the collector part 2 by being press-fitted with respect to 29, 30, the concave-convex fitting between the convex parts 31, 32 and the concave parts 29, 30 is made between the guide member 7 and the collector part 2. Can be sealed by part. When the heat exchange part 12 of the intercooler 5 is press-fitted into the guide member 7 fixed to the inner wall surface 8 of the collector part 2 from the intercooler insertion port 6, the outer periphery of the heat exchange part 12 is the inner peripheral surface of the guide member 7. 38, the heat exchange part 12 is reliably sealed between the outer periphery of the heat exchange part 12 of the intercooler 5 and the guide member 7 without providing the heat exchange part 12 with a structure for improving the sealing performance with the collector part 2. It becomes possible. Further, the dimensional variation of the heat exchanging portion 12 of the intercooler 5 is such that the guide member 7 bends when the intercooler 5 is press-fitted, and the convex portions 31 and 32 of the guide member 7 further extend into the concave portions 29 and 30 of the inner wall surface 8 of the collector portion 2. It can be absorbed by being pressed.

  That is, the unevenness of the intercooler 5 can be absorbed in the concave-convex fitting portion while ensuring the sealing performance between the intercooler 5 and the inner wall surface 8 of the intake manifold 1. In particular, the convex portions 31, 32 a, and 32 b of the guide member 7 are formed over the entire length of the bottom wall portion 24 and the side wall portions 26 a and 26 b, and the outer peripheral surface 28 of the guide member 7 is extended over the entire length of the collector portion. 2 is press-fitted into the recesses 29, 30a, and 30b formed on the inner wall surface 8, so that the entire length of the outer circumferential surface 28 of the guide member 7 is between the outer circumferential surface of the guide member 7 and the inner wall surface 8 of the collector portion 2. Therefore, it can be surely sealed.

  Further, the convex portions 32 a and 32 b provided on the side wall portions 26 a and 26 b of the guide member 7 have a trapezoidal cross-sectional shape in which the tip end side is narrowed, so that the heat exchange portion 12 of the intercooler 5 is press-fitted into the guide member 7. When the side wall portion 26 of the guide member 7 bends outward due to dimensional variations of the heat exchanging portion 12, the convex portions 32a and 32b are easily pressed into the concave portions 30a and 30b, and the intercooler 5 is assembled. Can be made easier.

  The guide member 7 press-fits the convex portions 31 and 32 formed on the outer peripheral surface 28 of the bottom wall portion 25 and the side wall portions 26a and 26b into the concave portions 29 and 30 formed on the inner wall surface 8 of the collector portion 2, respectively. By doing so, the guide member 7 can be reliably prevented from falling off because it is attached to the collector portion 2.

  Further, the protruding piece 27a formed on the side wall portion 26a located on the connection portion side between the intercooler upstream side intake chamber 10 and the intake introduction passage portion 4 is formed so as to be relatively large and overlap the intake inflow side end surface 18. Therefore, the inflow of the intake air between the outer peripheral surface of the intercooler 5 and the guide member 7 on the side to which the intake introduction passage portion 4 is connected, that is, the upstream side is more reliably suppressed, and the intercooler as a whole. The sealing performance between the outer peripheral surface 5 and the guide member 7 can be further improved.

  When the heat exchanging part 12 of the intercooler 5 is press-fitted into the guide member 7, it is press-fitted so that the intake inflow side end face 18 of the heat exchanging part 12 is along the inner surface of the protruding piece 27 of the guide member 7. Thus, the intercooler 5 can be assembled at the desired position of the guide member 7.

  Moreover, the convex part 32 of the side wall part 26 and the convex part 31 of the bottom wall part 25 are mutually offset in the width direction (the vertical direction in FIG. 3, the horizontal direction in FIG. 4) of the bottom wall part 25 and the side wall part 26. The first uneven fitting portion and the second uneven fitting portion are formed on the intercooler downstream side intake chamber 11 side of the side wall portion 26, and the third uneven fitting portion is on the intercooler upstream side. Since it is formed on the intake chamber 10 side, the guide member 7 can be fixed to the collector portion 2 with good stability.

  In the above-described embodiment, the convex portion 32a of the side wall portion 26a and the convex portion 32b of the side wall portion 26b are formed so that the positions in the width direction of the guide member 7 coincide with each other, and the convex portions 32a and 32b The convex portion 31 of the bottom wall portion 25 is formed at a position offset from each other in the width direction of the guide member 7, but the convex portions 32 a, 32 b and the convex portion 31 are each in the width direction of the guide member 7. You may make it form in the offset position. Moreover, you may make it form one of convex part 32a, 32b so that the position in the width direction of the guide member 7 of the convex part 31 may correspond. In other words, at least one of the first to third uneven fitting portions described above is formed so as to be offset in the width direction of the guide member 7 with respect to the other uneven fitting portions. It may be. Furthermore, the convex part 32 of the side wall part 26 and the convex part 31 of the bottom wall part 25 can be formed so as not to be offset from each other in the width direction of the bottom wall part 25 and the side wall part 26.

  In the above-described embodiment, the convex portion of the concave / convex fitting portion is formed on the guide member 7 and the concave portion is formed on the inner wall surface 8 of the collector portion 2. It is also possible to provide recesses in the guide member 7 in the inner wall surface 8.

  Moreover, the cross-sectional shape of the convex part 32 of the side wall part 26 is not limited to the trapezoidal cross section in which the front end side becomes thin, and for example, a rectangular cross section like the convex part 31 of the bottom wall part 25 may be used. Is possible. In this case, it is desirable that the cross-sectional shape of the corresponding concave portion is a rectangular cross-section in accordance with the cross-sectional shape of the convex portion in terms of securing a sealing surface in the concave-convex fitting portion and press-fitting the convex portion into the concave portion. Similarly, the cross-sectional shape of the convex portion 31 of the bottom wall portion 25 is not limited to the rectangular cross-section, and it can be a trapezoidal cross-section whose tip end side is narrow like the convex portion 32 of the side wall portion 26. It is. Also in this case, the trapezoidal cross section in which the cross-sectional shape of the corresponding concave portion becomes narrower in accordance with the cross-sectional shape of the convex portion in terms of securing the sealing surface in the concave-convex fitting portion and press-fitting into the concave portion of the convex portion. It is desirable to make it.

  In this embodiment, a variation absorption allowance C3 is set between the bottom wall portion 25 and the inner wall surface 8 of the collector portion 2 to absorb the dimensional variation of the heat exchange portion 12 of the intercooler 5. When the dimensional variation of the heat exchange part 12 only needs to be taken into account only in the longitudinal direction of the heat exchange part 12 (left and right direction in FIG. 3), it varies between the bottom wall part 25 and the inner wall surface 8 of the collector part 2. It is also possible not to set the absorption allowance C3.

DESCRIPTION OF SYMBOLS 1 ... Intake manifold 2 ... Collector part 4 ... Intake air introduction passage part 5 ... Intercooler 6 ... Intercooler insertion port 7 ... Guide member 8 ... Inner wall surface 10 ... Intercooler upstream side intake chamber 11 ... Intercooler downstream side intake chamber 12 ... Heat exchange part 25 ... bottom wall part 26a ... side wall part 26b ... side wall part 27 ... protruding piece 28a ... outer peripheral surface 28b ... outer peripheral surface 28c ... outer peripheral surface 29 ... concave part 30a ... concave part 30b ... concave part 31 ... convex part 32a ... convex part 32b ... convex part 34a ... bottom face 34b ... bottom face 35 ... bottom face

Claims (4)

In the intake manifold seal structure against the intercooler that cools the supercharged intake air in the intake manifold,
The intercooler is inserted from an intercooler insertion opening formed in the intake manifold, and the whole attached to the inner wall surface of the intake manifold is press-fitted into a U-shaped strip-shaped guide member, whereby the intake manifold is inserted. Fixed,
The outer peripheral surface of the intercooler is in close contact with the inner peripheral surface of the guide member,
The guide member has a concave-convex fitting portion formed of a convex portion and a concave portion formed along the longitudinal direction of the guide member between the guide member and the inner wall surface of the intake manifold. It is attached to the intake manifold, the tip of the convex portion of the concave / convex fitting portion is separated from the bottom surface of the concave portion of the concave / convex fitting portion, and the outer peripheral surface of the guide member is the inner side of the intake manifold. A seal structure for an intake manifold, wherein the intake manifold is attached to the intake manifold in a state of being separated from a wall surface.   The intake manifold seal structure according to claim 1, wherein the concave-convex fitting portion is formed over the entire length of the guide member in the longitudinal direction.   3. The intake manifold seal structure according to claim 1, wherein the convex portion of the concave-convex fitting portion has a cross-sectional trapezoidal shape in which a tip end side is narrowed. The guide member has a bottom wall part, and a first side wall part and a second side wall part respectively extending from both ends of the bottom wall part,
The uneven fitting portion includes a first uneven fitting portion formed between a first side wall portion of the guide member and an inner wall surface of the intake manifold, a second side wall portion of the guide member, and the intake manifold. A second uneven fitting portion formed between an inner wall surface and a third uneven fitting portion formed between a bottom wall portion of the guide member and an inner wall surface of the intake manifold;
Among the first to third uneven fitting portions, at least one uneven fitting portion is formed to be offset in the width direction of the guide member with respect to the other uneven fitting portions. The intake manifold seal structure according to any one of claims 1 to 3.

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