JP2017203385A - Intake duct of internal combustion engine and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain dropping of an adsorbent with a simple configuration.SOLUTION: An intake duct includes a duct body 10 formed and split in a circumferential direction by a pair of split bodies 11 and 12. The split bodies 11 and 12 are formed of a laminated member which includes a first fiber layer 13, a second fiber layer 14 provided on an outer peripheral side of the first fiber layer 13, and an adsorbent layer 17 interposed between the first fiber layer 13 and the second fiber layer 14 and having an adsorbent 16 adsorbing fuel vapor of an internal combustion engine. A joining portion 20 made of resin is provided between the one split body 11 and the other split body 12 so as to join the split bodies with each other and to cover end surfaces 11A and 12A exposing the adsorbent 16 in the split bodies 11 and 12.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an intake duct for an internal combustion engine and a method for manufacturing the same.

2. Description of the Related Art Conventionally, there is an intake duct for an internal combustion engine provided with a tubular duct body formed of a laminated member such as a nonwoven fabric for the purpose of reducing intake noise and reducing weight (for example, see Patent Document 1).
As shown in FIG. 12, the duct body 90 of the intake duct described in Patent Document 1 is formed by a pair of halves 91 and 92.

  Each of the halves 91 and 92 includes a first fiber layer 93 that forms the inner peripheral surface of the duct main body 90 and a second fiber that is provided on the outer peripheral side of the first fiber layer 93 and forms the outer peripheral surface of the duct main body 90. Layer 94. Both the first fiber layer 93 and the second fiber layer 94 are formed of a nonwoven fabric. An adsorbent 96 that adsorbs fuel vapor of the internal combustion engine is interposed between the first fiber layer 93 and the second fiber layer 94.

  At both ends in the circumferential direction of the halves 91 and 92, flanges 97 and 98 projecting outward are provided, respectively. The pair of halves 91 and 92 are joined to each other by joining the opposing surfaces of the flanges 97 and 98 by hot plate welding or vibration welding.

JP 2007-321600 A

  By the way, in the air intake duct described in Patent Document 1, since the adsorbent 96 is exposed on the end surfaces of the flanges 97 and 98 (the left end surface and the right end surface in the figure), the adsorbent 96 is introduced into the engine room from the end surfaces. There is a risk of falling inside. As a result, there is a problem that the merchantability of the intake duct is lowered.

  An object of the present invention is to provide an intake duct for an internal combustion engine and a method for manufacturing the intake duct for the internal combustion engine that can suppress the falling off of the adsorbent with a simple configuration.

  An intake duct of an internal combustion engine for achieving the above object includes a duct body formed by dividing a plurality of divided bodies in a circumferential direction, and at least one of the plurality of divided bodies includes a first fiber layer, An adsorbent having a second fiber layer provided on the outer peripheral side of the first fiber layer and an adsorbent interposed between the first fiber layer and the second fiber layer and adsorbing fuel vapor of the internal combustion engine The laminated member and the other divided body are joined between the laminated member and another divided body adjacent to the laminated member in the circumferential direction. In addition, a resin-made joint is provided to cover the exposed end surface of the adsorbent in the laminated member.

  According to this configuration, the laminated member and the other divided body are joined by the resin joint, and the exposed end surface of the adsorbent in the laminated member is covered. Therefore, it is possible to suppress the adsorbent from dropping from the end face of the laminated member.

  A method of manufacturing an intake duct for an internal combustion engine for achieving the above object includes a step of placing the laminated member and the other divided body in a state of being adjacent to each other in a circumferential direction inside the mold, and the mold And a step of insert-molding the joint portion to the laminated member and the other divided body by supplying a molten resin to a cavity formed in the inside.

  According to this method, the laminated member and the other divided body are joined together by the insert-molded resin joint, and the end surface where the adsorbent is exposed in the laminated member is covered. It is possible to prevent the adsorbent from dropping from the end face of the laminated member.

  Further, according to the method, since the joint portion is insert-molded, the molten resin soaks into the gaps between the fibers constituting the laminated member. Therefore, the joint portion and the laminated member are firmly joined by the anchor effect.

  According to the present invention, dropping of the adsorbent can be suppressed with a simple configuration.

The perspective view which shows the whole inlet duct about 1st Embodiment of the intake duct of an internal combustion engine. Sectional drawing which shows typically the cross-sectional structure along the extension direction of the inlet duct of 1st Embodiment. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2. Sectional drawing along the extending direction of the shaping | molding die which insert-molds a junction part and a coating | coated part with respect to a pair of division body which comprises the inlet duct of 1st Embodiment. FIG. 5 is a partial cross-sectional view taken along line 5-5 in FIG. The partial cross-sectional view which shows centering on the junction part of an inlet duct about 2nd Embodiment of the intake duct of an internal combustion engine. FIG. 7 is a partial cross-sectional view corresponding to FIG. 6 for a modified example of an intake duct of an internal combustion engine. The partial cross-sectional view corresponding to FIG. 6 about the other modification of the intake duct of an internal combustion engine. The fragmentary sectional view which shows typically the cross-sectional structure along the extension direction of an inlet duct about the other modification of the intake duct of an internal combustion engine. The fragmentary sectional view corresponding to FIG. 9 about the other modification of the intake duct of an internal combustion engine. The fragmentary sectional view corresponding to FIG. 9 about the other modification of the intake duct of an internal combustion engine. The cross-sectional view of the conventional intake duct.

<First Embodiment>
Hereinafter, a first embodiment in which an intake duct of an internal combustion engine is embodied as an inlet duct of an in-vehicle internal combustion engine will be described with reference to FIGS.

As shown in FIGS. 1 to 3, the inlet duct is provided in the intake passage of the in-vehicle internal combustion engine, and includes a tubular duct body 10.
The duct main body 10 is formed by being divided in the circumferential direction by a pair of divided bodies 11 and 12 having a half cracked cylindrical shape.

  As shown in FIGS. 2 and 3, each of the divided bodies 11 and 12 includes a first fiber layer 13 that forms the inner peripheral surface of the duct body 10 and a second fiber provided on the outer peripheral side of the first fiber layer 13. A fiber layer 14 and a non-breathable skin layer 15 provided on the outer peripheral side of the second fiber layer 14 and respectively forming the outer peripheral surface of the duct body 10 are provided. Further, an adsorbent layer 17 having a granular adsorbent 16 that adsorbs fuel vapor of an internal combustion engine such as activated carbon is interposed between the first fiber layer 13 and the second fiber layer 14. That is, all of the divided bodies 11 and 12 are formed of a laminated member having the first fiber layer 13, the second fiber layer 14, and the adsorbent layer 17.

The first fiber layer 13 is formed of a nonwoven fabric made of synthetic resin fibers. In this embodiment, for example, a known core-sheath type composite fiber having a core part made of PET (polyethylene terephthalate) and a sheath part made of modified PET having a melting point lower than that of the PET fiber (both not shown) is used. One fiber layer 13 is formed. Therefore, the sheath part which consists of modified PET functions as a binder which couple | bonds fibers. Incidentally, the basis weight of the first fibrous layer 13 ^is preferably in the range of ^{50g / m 2 ~500g / m 2} . Moreover, it is preferable that the thickness of the 1st fiber layer 13 exists in the range of 0.1 mm-3 mm.

The second fiber layer 14 is formed of a nonwoven fabric made of synthetic resin fibers. In the present embodiment, the second fiber layer 14 is formed of, for example, a main fiber made of PET and a binder fiber made of PP (polypropylene) and bonding the main fibers together. Incidentally, the basis weight of the second fibrous layer 14 ^is preferably in the range of ^{200g / m 2 ~1000g / m 2} . Moreover, it is preferable that the thickness of the 2nd fiber layer 14 exists in the range of 0.5 mm-5 mm.

The skin layer 15 is a thin film made of PP, for example. Incidentally, the basis weight of the skin layer 15 ^is preferably in the range of ^{10g / m 2 ~200g / m 2} . Moreover, it is preferable that the thickness of the skin layer 15 exists in the range of 0.1 mm-1 mm.

  As shown in FIG. 3, the end surface 11 </ b> A where the adsorbent 16 in one divided body 11 is exposed and the end surface 12 </ b> A where the adsorbent 16 is exposed in the other divided body 12 face each other in the circumferential direction. Between the divided bodies 11 and 12, there is provided a hard resin joint 20 that joins each other and covers the end surfaces 11 </ b> A and 12 </ b> A of the divided bodies 11 and 12 where the adsorbent 16 is exposed.

  The joining portion 20 includes an intervening portion 21 interposed between the end faces 11A and 12A, an outer peripheral portion 22 formed continuously with the interposing portion 21 and joined to the outer peripheral surfaces of the divided bodies 11 and 12, and It has an inner peripheral portion 23 formed continuously with the interposition portion 21 and joined to the inner peripheral surfaces of the divided bodies 11 and 12, and has an H-shaped cross section.

  As shown in FIGS. 1 and 2, one end of the duct body 10 in the extending direction covers end surfaces 11 </ b> B and 12 </ b> B in the extending direction of the divided bodies 11 and 12 and functions as an inlet for the inlet duct. A shaped upstream side covering portion 30 is provided.

  As shown in FIG. 1, the upstream covering portion 30 is made of the same hard resin as the pair of joint portions 20, and is formed continuously with the joint portion 20. A pair of mounting seats 31 projecting in directions away from each other are formed on the outer peripheral surface of the upstream side covering portion 30. Each mounting seat 31 is formed with a mounting hole 32 for inserting a bolt for mounting the inlet duct into the engine room.

As shown in FIGS. 1 and 2, the upstream side covering portion 30 has an outer peripheral portion 33 joined to the outer peripheral surface of the duct body 10 over the entire periphery.
As shown in FIGS. 1 and 2, the other end of the duct body 10 in the extending direction is covered with end surfaces 11C and 12C in the extending direction of the divided bodies 11 and 12, and is connected to an inlet 81 of an air cleaner. A cylindrical downstream side covering portion 40 that functions as a connecting portion is provided.

As shown in FIG. 1, the downstream cover portion 40 is made of the same hard resin as the pair of joint portions 20 and is formed continuously with the joint portion 20.
As shown in FIGS. 1 and 2, the downstream side covering portion 40 has an outer peripheral portion 41 joined to the outer peripheral surface of the duct body 10 over the entire periphery.

In the present embodiment, the joining portion 20, the upstream covering portion 30, and the downstream covering portion 40 are integrally formed of PP.
Next, a description will be given of a molding die 50 for insert-molding the joint portion 20 and the covering portions 30 and 40 of the inlet duct of the present embodiment, and a manufacturing method for manufacturing the inlet duct. Hereinafter, the direction along the extending direction of the duct body 10 in the mold 50 is simply referred to as the extending direction.

  As shown in FIGS. 4 and 5, the mold 50 includes a pair of split molds 51 and 52. Concave portions 53, 54, and 55 for forming the outer peripheral portion 22 and the covering portions 30 and 40 of the joint portion 20 are formed on the inner peripheral surfaces of the pair of split dies 51 and 52, respectively.

As shown in FIG. 4, a pair of cores 61 and 62 are provided adjacent to each other in the extending direction inside the pair of split dies 51 and 52.
The pair of cores 61 and 62 includes first molding portions 63 and 64 that respectively mold the inner peripheral portion 23 of the joint portion 20 and second molding portions 65 and 66 that respectively mold the inner peripheral surfaces of the covering portions 30 and 40. And have.

  When manufacturing the inlet duct, first, after heating the sheet-like material in which the first fiber layer 13, the adsorbent layer 17, the second fiber layer 14, and the skin layer 15 are overlapped with each other in the same order, The divided bodies 11 and 12 are formed by pressing into a half-cracked cylinder.

Further, the divided materials 11 and 12 may be formed by forming the sheet-like material into a half-cracked cylinder by hot pressing.
Next, one of the divided bodies 11 is placed on the divided mold 51 in a state where the mold is opened, and a pair of middle parts are placed so that the first molding parts 63 and 64 are positioned on the inner peripheral surface of the divided body 11, respectively. The children 61 and 62 are placed. Subsequently, the other divided body 12 is placed on the first molding parts 63 and 64, and the mold is closed by the divided mold 52.

In this way, the pair of divided bodies 11 and 12 are placed inside the mold 50 in a state of being adjacent to each other in the circumferential direction.
At this time, as shown in FIG. 5, the pair of divided bodies 11, 12, the concave portions 53 of the pair of divided molds 51, 52, the first molding parts 63, 64 of the pair of cores 61, 62, and the pair of divided bodies 11. The cavity 71 is formed by the end faces 11A and 12A facing each other in the circumferential direction.

  Further, as shown in FIG. 4, the cavity 72 is formed by the recesses 54 of the pair of split molds 51, 52, the end portions of the pair of split bodies 11, 12, and the outer peripheral surface of the second molding portion 65 of the core 61. Is done.

Further, a cavity 73 is formed by the concave portions 55 of the pair of split dies 51 and 52, the end portions of the pair of split bodies 11 and 12, and the outer peripheral surface of the second molding portion 66 of the core 62.
These cavities 71, 72, 73 are in communication with each other.

  Then, by supplying the molten resin to the cavities 71 to 73 through a supply passage (not shown), the joint portion 20 and the covering portions 30 and 40 are insert-molded in the pair of divided bodies 11 and 12, respectively.

Thus, the inlet duct of this embodiment is manufactured.
According to the intake duct and the method for manufacturing the intake duct according to the present embodiment described above, the following operational effects can be obtained.

  (1) Between one divided body 11 and the other divided body 12 forming the duct body 10, the end surfaces 11A and 12A of the divided bodies 11 and 12 where the adsorbent 16 is exposed are covered with each other. A resin joint 20 is provided.

  According to such a configuration, the pair of divided bodies 11 and 12 are joined by the resin joint portion 20 and the end surfaces 11A and 12A of the pair of divided bodies 11 and 12 where the adsorbent 16 is exposed are covered. Therefore, the adsorbent 16 can be prevented from falling off from the end surfaces 11A and 12A of the pair of divided bodies 11 and 12 with a simple configuration.

(2) All of the divided bodies 11 and 12 are formed of a laminated member having the first fiber layer 13, the second fiber layer 14, and the adsorbent layer 17.
According to such a configuration, the adsorbent layer 17 is provided over the entire circumference of the inlet duct. For this reason, the fuel vapor | steam of an internal combustion engine can be adsorb | sucked effectively.

  (3) At the end portion of the duct body 10 in the extending direction, resin-coated covering portions 30 and 40 that cover the extending end surfaces 11B, 11C, 12B, and 12C of the pair of divided bodies 11 and 12 are joined portions. 20 is formed continuously.

  According to such a configuration, the end faces 11B, 11C, 12B, and 12C in the extending direction of the pair of divided bodies 11 and 12 are covered with the resin covering portions 30 and 40. For this reason, dropping of the adsorbent 16 from the end faces 11B, 11C, 12B, 12C is suppressed.

  Moreover, since the coating | coated parts 30 and 40 are continuously formed in the junction part 20, the cavities 71-73 of the shaping | molding die 50 for shape | molding the coating | coated parts 30 and 40 and the junction part 20, respectively are connected. For this reason, the number of supply passages for supplying the molten resin to the cavities 71 to 73 can be reduced. Therefore, the configuration of the mold 50 is simplified.

(4) The downstream side covering portion 40 is a connection portion connected to the inlet 81 of the air cleaner.
According to such a configuration, the downstream coating portion 40 also functions as a connection portion connected to the inlet 81 of the air cleaner. Therefore, the configuration of the inlet duct is simplified as compared with the configuration in which the connecting portion is attached to the duct body 10 by snap fitting or the like.

(5) On the outer peripheral side of the second fiber layer 14, a non-breathable skin layer 15 is provided.
According to such a configuration, the fuel adsorbed by the adsorbent 16 can be prevented from leaking to the outside through the second fiber layer 14, and the fuel adsorbed by the adsorbent 16 is effective together with the intake air in the combustion chamber of the internal combustion engine. Can be introduced and processed.

  (6) The joint portion 20 is formed between the end faces 11A and 12A opposed to each other in the circumferential direction of the pair of divided bodies 11 and 12, and the intermediate body 21 is formed continuously with the interposed section 21 and the divided body. 11 and the outer peripheral part 22 joined to the outer peripheral surface.

  According to such a structure, a pair of division bodies 11 and 12 can be joined, without setting a flange to a pair of division bodies 11 and 12, respectively. For this reason, it can avoid that the physique of an inlet duct becomes large in radial direction resulting from setting a flange. In addition, the inner diameter of the inlet duct, that is, the flow path cross-sectional area can be increased without increasing the size of the inlet duct in the radial direction.

(7) The joint portion 20 includes an inner peripheral portion 23 that is formed continuously with the interposition portion 21 and is joined to the inner peripheral surfaces of the pair of divided bodies 11 and 12.
According to such a configuration, the opposing end portions of the pair of divided bodies 11 and 12 are sandwiched between the outer peripheral portion 22 and the inner peripheral portion 23 of the joint portion 20. For this reason, a pair of division bodies 11 and 12 can be joined more firmly.

  (8) The method of manufacturing the inlet duct includes a step of placing the pair of divided bodies 11 and 12 in the molding die 50 in a state of being adjacent to each other in the circumferential direction, and a cavity 71 to be formed in the molding die 50. A step of insert-molding the joint portion 20 into the pair of divided bodies 11 and 12 by supplying a molten resin to 73.

  According to such a method, the pair of divided bodies 11 and 12 are joined and the end surfaces 11A and 12A where the adsorbent 16 is exposed in the pair of divided bodies 11 and 12 are covered by the joint portion 20 formed by insert molding. Therefore, the same effect as the effect (1) can be obtained.

  Moreover, according to the said method, since the junction part 20 is insert-molded, molten resin permeates the clearance gap between the fibers which comprise a pair of division bodies 11 and 12. FIG. Therefore, the joint portion 20 and the pair of divided bodies 11 and 12 are firmly joined by the anchor effect.

Second Embodiment
Next, with reference to FIG. 6, the second embodiment will be described focusing on the differences from the first embodiment. In addition, since the cross-sectional structure of the inlet duct of the present embodiment is bilaterally symmetrical in the figure, the redundant explanation of the structure on the left side is omitted by describing the structure on the right side of the inlet duct shown in the figure. To do.

  As shown in FIG. 6, flanges 113 and 114 projecting toward the outer peripheral side are provided at end portions in the circumferential direction of the pair of divided bodies 111 and 112, respectively. The flanges 113 and 114 are formed over the entire extending direction of the pair of divided bodies 111 and 112 and are in contact with each other in the circumferential direction.

The joint portion 120 has a U-shaped cross section and is formed over the entire extending direction of the pair of divided bodies 111 and 112 and sandwiches the flanges 113 and 114.
According to the intake duct and the method for manufacturing the intake duct according to the present embodiment described above, in addition to the effects (1) to (5) and (8) of the first embodiment, the following functions and effects are newly obtained. Be able to.

  (9) Flange 113,114 which protrudes toward the outer peripheral side is provided in the edge part in the circumferential direction of a pair of division body 111,112, respectively. The joint 120 sandwiches the flanges 113 and 114.

  According to such a configuration, the flanges 113 and 114 of the pair of divided bodies 111 and 112 are covered with the joint portion 120 and are joined to each other by being sandwiched. For this reason, a pair of division body 111,112 can be joined firmly. Therefore, the protrusion width of the flanges 113 and 114 from the outer peripheral surfaces of the pair of divided bodies 111 and 112 can be shortened as compared with the case where the flanges 113 and 114 are joined to each other by hot plate welding or vibration welding. Therefore, it can be avoided that the size of the inlet duct is increased in the radial direction due to the setting of the flanges 113 and 114. In addition, the inner diameter of the inlet duct, that is, the flow path cross-sectional area can be increased without increasing the size of the inlet duct in the radial direction.

<Modification>
In addition, the said embodiment can also be changed as follows, for example.
-The division bodies 111 and 112 with the flanges 113 and 114 illustrated in 2nd Embodiment can also be joined by the junction part 220 shown in FIG. That is, as shown in FIG. 7, the joining part 220 includes a sandwiching part 224 having a U-shaped cross section shown in the second embodiment, an interposition part 221 interposed between the flanges 113 and 114, and an interposition part 221. And an inner peripheral portion 223 joined to the inner peripheral surfaces of the pair of divided bodies 111 and 112.

  6 and 7, reinforcing ribs 126 and 226 may be formed integrally with the joints 120 and 220 on the outer peripheral surface of the inlet duct, as indicated by a two-dot chain line. If these ribs 126 and 226 are set so as not to protrude to the outer peripheral side from the joint portions 120 and 220, an increase in the physique in the radial direction of the inlet duct can be suppressed. In addition, as shown in FIG. 8, reinforcing ribs 26 can be integrally formed with the joint portion 20 exemplified in the first embodiment.

-The shape of the edge part of the duct main body 10, and the downstream coating | coated part 40 can also be changed as follows.
That is, as shown in FIG. 9, a plurality of through holes 18 penetrating in the radial direction are formed at the end of the duct body 10 at intervals in the circumferential direction. A protruding portion 42 that protrudes toward the inside of each through hole 18 is formed on the inner peripheral surface of the outer peripheral portion 41 of the downstream side covering portion 40. In this case, since the protruding portion 42 is insert-molded together with the downstream coating portion 40, the molten resin forming the protruding portion 42 soaks into the gaps between the fibers forming the inner peripheral surface of the through hole 18. Therefore, the duct main body 10 and the downstream side coating | coated part 40 can be joined more firmly by the anchor effect.

  Further, as shown in FIG. 10, an annular flange 101 protruding toward the outer peripheral side is formed at the end of the duct body 10. The outer peripheral portion 41 of the downstream side covering portion 40 is joined over the entire outer periphery of the duct body 10 and the outer peripheral surface of the flange 101.

  Moreover, as shown in FIG. 11, the annular compression part 19 is formed in the outer peripheral surface of the edge part of the duct main body 10 by compressing each division body 11 and 12 from an outer peripheral side. In this case, when the downstream covering portion 40 is insert-molded, the compression portion 19 prevents the molten resin from entering the duct main body 10 side (the left side in the figure) through the gap between the fibers. For this reason, the deterioration of the air permeability of the first fiber layer 13 due to the penetration of the resin can be suppressed, and the function of adsorbing and releasing the fuel vapor by the adsorbent 16 can be suppressed.

Moreover, the shape of the upstream coating | coated part 30 can be changed into the shape according to the downstream coating | coated part 40 shown in FIGS.
As shown by a two-dot chain line in FIG. 1, the stay 27 can be formed integrally with the joint portion 20.

The adsorbent 16 is not limited to granular activated carbon. In addition, for example, resin fibers impregnated with activated carbon, zeolite, or the like may be used.
In the first embodiment, the inner peripheral portion 23 of the joint portion 20 may be omitted.

  The skin layer 15 of the duct body 10 can be omitted. In this case, the air permeability of the second fiber layer 14 may be set low so that the fuel adsorbed by the adsorbent 16 does not leak outside through the second fiber layer 14.

  -At least one of the upstream coating | coated part 30 and the downstream coating | coated part 40 can also be abbreviate | omitted. In this case, for example, a connecting portion connected to the inlet 81 of the air cleaner may be attached to the end of the duct body 10.

  -One division body can also be formed with a hard resin material.

  DESCRIPTION OF SYMBOLS 10 ... Duct main body, 11 ... Divided body (laminated member), 11A ... End face, 11B ... End face, 11C ... End face, 12 ... Divided body (laminated member), 12A ... End face, 12B ... End face, 12C ... End face, 13 ... No. DESCRIPTION OF SYMBOLS 1 fiber layer, 14 ... 2nd fiber layer, 15 ... Skin layer, 16 ... Adsorbent, 17 ... Adsorbent layer, 18 ... Through-hole, 19 ... Compression part, 20 ... Joint part, 21 ... Interposition part, 22 ... Outer periphery , 23 ... inner peripheral part, 26 ... rib, 27 ... stay, 30 ... upstream side covering part, 31 ... mounting seat, 32 ... mounting hole, 33 ... outer peripheral part, 40 ... downstream side covering part (connection part), 41 ... outer peripheral part, 42 ... projecting part, 50 ... molding die, 51, 52 ... split mold, 53-55 ... recess, 61, 62 ... core, 63, 64 ... first molding part, 65, 66 ... second molding , 71-73 ... cavity, 81 ... inlet, 101 ... flange, 110 ... duct body, 11 ... divided body (laminated member), 112 ... divided body (laminated member), 113 ... flange, 114 ... flange, 120 ... joined portion, 126 ... rib, 220 ... joined portion, 221 ... interposed portion, 223 ... inner peripheral portion, 224 ... clamping part, 226 ... rib.

Claims (9)

A duct body formed by dividing in a circumferential direction by a plurality of divided bodies,
At least one of the plurality of divided bodies includes a first fiber layer, a second fiber layer provided on an outer peripheral side of the first fiber layer, and between the first fiber layer and the second fiber layer. And is formed by a laminated member including an adsorbent layer having an adsorbent that adsorbs the fuel vapor of the internal combustion engine,
The laminated member and the other divided body are joined between the laminated member and another divided body adjacent to the laminated member in the circumferential direction, and the adsorbent in the laminated member is exposed. A resin joint for covering the end surface is provided,
An intake duct for an internal combustion engine. All of the plurality of divided bodies are formed by the laminated member,
An intake duct for an internal combustion engine according to claim 1. At the end portion in the extending direction of the duct body, a resin-made covering portion that covers the end surface in the extending direction of the laminated member is formed continuously with the joint portion.
An intake duct for an internal combustion engine according to claim 1 or 2. The covering portion is a connection portion connected to an inlet of an air cleaner.
An intake duct for an internal combustion engine according to claim 3. In the intake duct of the internal combustion engine according to any one of claims 1 to 4,
On the outer peripheral side of the second fiber layer, a non-breathable skin layer is provided,
An intake duct for an internal combustion engine. The exposed end surface of the adsorbent in the laminated member and the end surface of the other divided body are opposed in the circumferential direction,
The joining portion is formed continuously between the end surfaces facing each other in the circumferential direction of the laminated member and the other divided body, and the laminated member and the others An outer peripheral portion joined to the outer peripheral surface of the divided body of
An intake duct for an internal combustion engine according to any one of claims 1 to 5. The joining portion has an inner peripheral portion that is formed continuously with the interposition portion and joined to the inner peripheral surface of the laminated member and the other divided body.
An intake duct for an internal combustion engine according to claim 6. At the end portions in the circumferential direction of the laminated member and the other divided bodies, flanges protruding toward the outer peripheral side are provided, respectively.
The joint portion sandwiches the flanges of the laminated member and the other divided bodies,
An intake duct for an internal combustion engine according to any one of claims 1 to 5. A method for manufacturing an intake duct for an internal combustion engine according to any one of claims 1 to 8,
Placing the laminated member and the other divided body in a state of being adjacent to each other in the circumferential direction inside the mold;
A step of insert-molding the joint portion to the laminated member and the other divided body by supplying a molten resin to a cavity formed inside the molding die,
A method for manufacturing an intake duct of an internal combustion engine.

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