JP2014118891A - Air intake duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air intake duct which can protect sound absorption members.SOLUTION: Divided bodies 14 constituting the air intake duct 10 comprise: the sound absorption members 30 for covering openings 20 formed at passages 18 for defining an air flow passage 12a; protection parts 24 integrally arranged at the passages 18 so as to be bulged to the outside from the passages 18, and covering the outside of the sound absorption members 30 with intervals from the sound absorption members 30 which face the openings 20; and attachment parts 25 integrally formed at the protection parts 24. The sound absorption members 30 are held by holding members 40 attached to the attachment parts 25 from the side of the air flow passage 12a.

Description

  The present invention relates to an intake duct used for an intake system of an engine in a vehicle.

  As disclosed in Patent Document 1, an intake duct has been proposed in which intake noise generated in an intake system of an engine is reduced. In the air intake duct of Patent Document 1, a plurality of openings are provided in the wall surface of the duct body, and a sound absorbing member that covers the outside of the opening is fixed by a holding member attached to the duct body.

Japanese Utility Model Publication No. 6-10116

  In the air intake duct of Patent Document 1, the sound absorbing member is exposed on the outer surface, so that the sound absorbing member is caught and damaged when the duct is attached or during vehicle maintenance, or the sound absorbing member is displaced from the opening. May cause problems. In addition, since the sound absorbing member has air permeability, water may enter the intake duct through the sound absorbing member during high-pressure cleaning of the engine room or from a gap where the sound absorbing member is displaced due to water pressure.

  That is, the present invention has been proposed in order to suitably solve these problems inherent in the intake duct according to the prior art, and an object thereof is to provide an intake duct that can protect the sound absorbing member. To do.

In order to overcome the above-mentioned problems and achieve an intended purpose, an intake duct according to claim 1 of the present application includes:
In the intake duct constituted by a plurality of divided bodies in which end portions along the air flow direction of the air flow passage are assembled to each other, the cylindrical duct main body defining the air flow passage,
At least one of the plurality of divided bodies is
A sound-absorbing member comprising a sheet-like material having air permeability, and covering an opening formed in a wall portion defining the air flow passage from the air flow passage side;
A protective portion that is integrally formed with the wall portion so as to bulge outward from the wall portion, and covers the outside of the sound absorbing member at a distance from the sound absorbing member facing the opening;
The gist includes an attachment portion that is formed integrally with the protection portion with the protection portion recessed inward and that supports the sound absorbing member that covers the opening from the outside.
According to the first aspect of the invention, since the outer side of the sound absorbing member covering the opening is covered and protected by the protective part, the sound absorbing member is damaged when the intake duct is attached or during vehicle maintenance, Occurrence of problems such as displacement of the sound absorbing member can be prevented. In addition, it is possible to prevent water from entering the air flow passage of the intake duct via the opening and the sound absorbing member by the protective portion. Since the sound absorbing member is supported by the mounting portion integrally formed with the protection portion, the space required for installing the sound absorbing member can be reduced. And since it is the structure which combines a divided body after attaching a sound-absorbing member inside a divided body, a sound-absorbing member can be attached easily.

A gist of the invention according to claim 2 is that the sound absorbing member is attached to the attachment portion with the sound absorbing member sandwiched from the air flow passage side and includes a holding member that holds the sound absorbing member.
According to the invention which concerns on Claim 2, since it is the structure which attaches a holding member to the attaching part integrally formed in the protection part, the space required for installation of a holding member can be made small. And since it is the structure which attaches a holding member from the inner side of a division body similarly to a sound absorption member, it can attach easily in the state before combining a division body.

In the invention which concerns on Claim 3, the said holding member is provided with the 2nd engaging part formed corresponding to the 1st engaging part formed in the above-mentioned division body so that the opening part was formed annularly,
The holding member has the sound absorbing member that has the outer peripheral edge sandwiched between the first engaging portion and the second engaging portion by opening the sound absorbing member with the second engaging portion engaged with the first engaging portion. The gist is that it is attached to the attachment portion in a state of being pulled toward the outside of the opening surface.
According to the third aspect of the invention, the intake noise of the duct body can be further reduced by applying an appropriate tension to the sound absorbing member that covers the opening. Moreover, even a sound-absorbing member having flexibility by the holding member can be appropriately held.

In the invention which concerns on Claim 4, the said protection part is dented inside, The support part integrally formed with this protection part is provided,
A gist of the invention is that the support portion is configured such that the end surface thereof faces the inside of the opening at a position away from the opening edge of the opening.
According to the invention which concerns on Claim 4, a sound absorption member can be position-controlled from an outer side by a support part.

In the invention which concerns on Claim 5, the said holding member is a mesh shape which has the cyclic | annular outer frame matched with the outer periphery of the said opening part, and the several inner frame extended so that it may cross | intersect inside this outer frame. The gist of the present invention is to provide an intersecting portion of the inner frame which is formed and formed in conformity with the end surface of the support portion.
According to the fifth aspect of the invention, by restricting the position of the sound absorbing member between the intersecting portion of the inner frame of the holding member and the support portion, it is possible to prevent damage when negative pressure is applied to the sound absorbing member.

  According to the intake duct according to the present invention, the sound absorbing member can be protected by the protection portion.

1 is a schematic perspective view showing an intake duct according to a preferred embodiment of the present invention. It is an end elevation which shows the cut part fractured | ruptured by the AA line of FIG. It is an end elevation which shows the cut part fractured | ruptured by the BB line of FIG. It is a schematic perspective view which decomposes | disassembles and shows the intake duct of an Example. It is a schematic plan view which shows the lower division body of an Example, (a) shows the state which attached the holding member, (b) shows the state which removed the holding member. In (a), the sound absorbing member is omitted. It is a schematic perspective view which shows the lower division body of an Example. It is a schematic bottom view which shows the upper division body of an Example, (a) shows the state which hold | maintained the sound absorption member and attached the holding member, (b) shows the state which removed the holding member. It is a schematic perspective view which shows the upper division body of an Example. (a) is the C section enlarged view of FIG. 3, (b) is the D section enlarged view of FIG.

  Next, an intake duct according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments.

  The intake duct according to the embodiment is installed in the vehicle in a posture in which the opening on the suction side and the opening on the discharge side face sideways and the air flow passage is laterally pulled. As shown in FIG. 1 to FIG. 3, the intake duct 10 includes a plurality of tubular duct bodies 12 that define an air flow passage 12 a, and end edges of the air flow passage 12 a along the air flow direction are assembled to each other. It is composed of divided bodies 14. Here, the duct main body 12 according to the embodiment has two upper and lower portions of a lower lower divided body 14A formed in a bowl shape opened upward and an upper upper divided body 14B formed in a bowl shape opened downward. It consists of two. Then, the lower divided body 14A and the upper divided body 14B are fitted into the groove portions 15 provided on both upper end edges of the lower divided body 14A with the projecting pieces 16 projecting downward at both lower end edges of the upper divided body 14B, Assembled together. The divided body 14 is a molded product made of a synthetic resin such as polypropylene (PP) or high density polyethylene (HDPE) and obtained by injection molding or the like.

  Each divided body 14 includes a sound absorbing structure for reducing intake noise in the intake duct 10. As shown in FIGS. 2 to 4, the sound absorbing structure of the embodiment includes a sound absorbing member 30 that covers an opening 20 formed in a wall portion (referred to as a passage portion) 18 that defines an air flow passage 12 a, and a sound absorbing member 30. A protective portion 24 integrally formed with the passage portion 18 so as to cover the outer side of the sound source, and a concave portion of the protective portion 24 inwardly formed so as to be integrated with the protective portion 24 and supporting the sound absorbing member 30 covering the opening 20 from the outside. It is fundamentally comprised from the attaching part 25 to do. Here, the sound absorbing member 30 is held by the holding member 40 attached to the attachment portion 25 with the sound absorbing member 30 interposed therebetween from the inside of the divided body 14 (air flow passage 12a side). When the divided body 14 is assembled to another divided body 14 to form the duct body 12, the passage portion 18 is formed so as to satisfy the air flow cross section of the air flow passage 12 a required for the intake duct 10. . In addition, the intake duct 10 is provided with an opening 20 at the bottom portion of the passage portion 18 formed in a concave shape opened upward in the lower divided body 14A, and a concave shape opened downward in the upper divided body 14B. An opening 20 is provided in the ceiling portion of the passage portion 18 formed in the upper and lower portions, and the two opening portions 20 and 20 face each other up and down across the air flow passage 12a. In addition, the opening part 20 of an Example is formed in the substantially rectangular shape extended in the longitudinal direction in the air distribution direction of the airflow path 12a. Thus, in the intake duct 10 of the embodiment, the two sound absorbing structures are provided so as to face each other vertically. Here, since the basic structure of the sound absorbing structure is the same between the lower divided body 14A and the upper divided body 14B, the sound absorbing structure of the lower divided body 14A will be described below as an example, and the upper divided body 14B will be described below. Only the necessary part of the sound absorbing structure will be described.

  In the divided body 14, a protective portion 24 integrally formed with the passage portion 18 so as to swell outward from the passage portion 18 in the direction intersecting with the air flow direction (lower in the lower divided body 14 </ b> A and upper in the upper divided body 14 </ b> B). A space is defined outside the opening 20 by the protective part 24 formed in a concave shape that opens to the air flow passage 12a side in accordance with the opening 20 (see FIGS. 2 and 3). Here, the protection unit 24 does not define a space as a resonance chamber like a resonance type silencer, but when the sound absorbing member 30 is deformed due to a pressure fluctuation of the air flowing through the air flow passage 12a. The sound-absorbing member 30 is formed so as to cover the outside of the sound-absorbing member 30 installed in the opening 20 with an interval so as not to contact the sound-absorbing member 30. In addition, although it is desirable that the facing surface facing the sound absorbing member 30 installed in the opening 20 in the protection portion 24 is at least 10 mm away from the sound absorbing member 30, it is not necessary to secure a volume as in the resonance chamber, so that the intake air The shape can be appropriately set according to the members installed around the duct 10. Moreover, the 1st engaging part 22 is formed in the division body 14 so that the opening part 20 may be enclosed (refer FIGS. 2-4). The first engaging portion 22 is a protruding strip formed so as to protrude toward the air flow passage 12 a (upward in the lower divided body 14 </ b> A and downward in the upper divided body 14 </ b> B), and has an annular shape surrounding the entire periphery of the opening 20. (See FIG. 5B).

  As shown in FIGS. 6 and 8, the protection portion 24 is provided with an attachment portion 25 for attaching the holding member 40 so as to face the inside of the opening 20. Here, a plurality of (eight in the embodiment) mounting portions 25 arranged in the air flow direction are provided in the protection portion 24 in two rows in the left-right direction intersecting the air flow direction. And the attaching part 25 of each row | line | column is arrange | positioned side by side in the position close | similar to each of the inner edge along the air distribution direction in the opening part 20, and what is arrange | positioned in the corner inside the opening in the opening part 20 in the Example. (See FIG. 5 (b) and FIG. 7 (b)). In addition, one attachment portion 25 is provided on the protection portion 24 so as to face the substantially central portion inside the opening of the opening 20. In addition, the attachment parts 25 in both rows are arranged opposite to each other in the left-right direction intersecting the air flow direction, and the center attachment parts 25 are arranged at positions shifted in the air flow direction with respect to the left and right attachment parts 25. .

  The mounting portion 25 provided in the left-right direction intersecting the air flow direction is adapted to project the wall (ceiling wall or bottom wall) facing the opening 20 in the protection portion 24 to the air flow passage 12a side. A wall (side wall) extending in a direction intersecting with the air flow passage 12 a in the portion 24 is formed in a step shape by being recessed inside the opening of the opening 20. Further, the mounting portion 25 provided so as to face the center portion of the opening portion 20 is adapted to project the wall (ceiling wall or bottom wall) facing the opening portion 20 in the protection portion 24 toward the air flow passage 12a. The wall is recessed to form a step. That is, the mounting portion 25 is a shelf portion formed by denting the outer side in accordance with the inward projection of the wall constituting the protective portion 24, and the inner side at the central portion of the mounting end surface 25 a facing the opening 20. The holding member 40 is held by engagement with a rod-shaped attachment piece 26 that protrudes upward (in the lower divided body 14A, downward in the upper divided body 14B). Each mounting portion 25 is formed so that the mounting end surface 25a is aligned with the opening surface of the opening 20 (Example), or the mounting end surface 25a is formed slightly outside the opening surface of the opening 20. For example, by disposing the attachment end surface 25a outside the opening surface, it is possible to secure a gap that allows the holding member 40 to be pulled outward when the holding member 40 is attached.

  As shown in FIGS. 6 and 8, the protection part 24 is provided with a support part 27 for positioning the sound absorbing member 30 covering the opening part 20 so as to face the opening inside of the opening part 20. In the protective part 24 of the lower divided body 14A, a plurality of (six in the embodiment) support parts 27 arranged in the air circulation direction are located between the rows of the left and right attachment parts 25, 25, and the air circulation direction. Two rows are provided in the intersecting left and right direction. In the lower divided body 14A, the support portions 27, 27 in both rows are arranged opposite to each other in the left-right direction intersecting the air flow direction, and are arranged at positions shifted in the air flow direction with respect to the left and right attachment portions 25, 25. (See FIG. 5 (b) and FIG. 7 (b)). In the protection part 24 of the upper divided body 14 </ b> B, a plurality of (six in the embodiment) support parts 27 arranged in the air circulation direction are provided between the left and right attachment parts 25, 25. The support portions 27 forming a row in the upper divided body 14B are arranged at positions shifted in the air circulation direction with respect to the left and right attachment portions 25, 25. Further, in both divided bodies 14A and 14B, the plurality of support portions 27 are distributed and arranged in an equal number with the attachment portion 25 in the center portion sandwiched in the air flow direction.

  As shown in FIG. 2 and FIG. 3, each support portion 27 is configured so that the wall (ceiling wall or bottom wall) facing the opening 20 in the protection portion 24 protrudes toward the air flow passage 12 a. It is recessed and formed in a step shape. That is, the support portion 27 is a stepped portion formed by denting the outside in accordance with the inward projection of the wall constituting the protection portion 24. In the embodiment, the mounting portion 25 is the inside of the protection portion 24. The support portion 27 is formed so as to swell in a columnar shape inside the protection portion 24. Each support part 27 is formed so that the support end face 27a facing the air flow passage 12a side is aligned with the opening face of the opening 20 (Example), or the support end face 27a is slightly outside the opening face of the opening 20. The support end surface 27 a can be positioned slightly inside the opening surface of the opening 20. For example, by arranging the support end surface 27 a on the inner side of the opening surface of the opening 20, the sound absorbing member 30 covering the opening 20 can be pushed by the support end surface 27 a to apply tension to the sound absorbing member 30. Moreover, although the support end surface 27a is disposed outside the opening surface of the opening 20, the sound absorbing member 30 covering the opening 20 is allowed to vibrate with a small width, but the sound absorbing member 30 is deformed with a large width. It can control by contact | abutting with the support end surface 27a.

  As shown in FIGS. 6 and 8, a rib 28 lower than the attachment portion 25 and the support portion 27 is formed inside the protection portion 24. In the lower divided body 14A, ribs 28 extending in the air flow direction are provided between the support portions 27 in one row. Further, in the upper divided body 14 </ b> B, ribs 28 extending in the air flow direction between the support portions 27 and ribs 28 extending in the left-right direction intersecting the air flow direction between the support portions 27 and the side surfaces of the protection portion 24. And are provided. In the divided body 14, the passage portion 18, the protection portion 24, the attachment portion 25, the support portion 27, and the rib 28 are formed at the same time, and are integrated integrally.

The sound absorbing member 30 is a sheet-like material made of a non-woven fabric having air permeability, and is set to a size capable of covering at least the opening 20 and the first engagement portion 22 surrounding the opening 20. The sound absorbing member 30 may have water repellency and water repellency by a surface treatment such as a water repellent or a water repellant. It can be omitted. Here, the nonwoven fabric made of thermoplastic resin fibers such as polyester fibers and polypropylene fibers, can be used those obtained by such spunbond method is not particularly limited 70g / m ² ~300g / m ² The basis weight is preferable. The nonwoven fabric is so-called embossed by embossing in a required pattern to provide a crimped portion where the thermoplastic resin fibers are melted and crimped, and a general portion that is not crimped or has a lower degree of crimping than the crimped portion. Is given. The sound absorbing member 30 of the embodiment is embossed so that the linear crimping portions extend in a lattice shape where the linear crimping portions intersect with each other, and this crimping portion improves the tensile strength and makes it difficult to stretch. In the sound absorbing member 30, insertion holes 30 a through which the attachment pieces 26 of the attachment portion 25 can be inserted are formed to penetrate in the thickness direction corresponding to the attachment pieces 26. The insertion hole 30a is formed larger than the outer diameter of the attachment piece 26 so as not to hinder the pulling of the sound absorbing member 30 due to the engagement of the first engagement portion 22 and the second engagement portion 48 described later.

  As shown in FIGS. 5A and 7A, the holding member 40 is a member that is formed to be slightly larger than the first engagement portion 22 that surrounds the outside of the opening 20, and the divided body 14. A resin molded product is used in the same manner as described above. The holding member 40 includes an outer frame 42 formed in a substantially rectangular shape in accordance with the opening 20, and a plurality of inner frames 44 extending so as to intersect the inside of the opening defined by the outer frame 42. It is formed in a mesh shape. A mounting plate 46 is provided in the holding member 40 inside the opening of the outer frame 42 so as to match the mounting portion 25, and a mounting hole 46 a penetrating inward and outward is formed in the mounting plate 46. In the holding member 40, mounting plates 46 corresponding to the mounting portions 25 in each row are arranged side by side at positions close to the inner edges of the outer frame 42 along the air flow direction. There are some which are arranged at the corner corners. A mounting plate 46 corresponding to the central mounting portion 25 is supported by the inner frame 44 and disposed at a substantially central portion inside the opening of the outer frame 42. The mounting plate 46 is disposed at a position overlapping the mounting end surface 25a of the mounting portion 25 when the holding member 40 is mounted on the divided body 14, and in the embodiment, has substantially the same shape as the mounting end surface 25a (the embodiment has a substantially rectangular shape). Shape) and substantially the same size. The holding member 40 is between an inner frame 44 that is laid between opposing outer frames 42 so as to extend in the air circulation direction, and an outer frame 42 that is opposed so as to extend in the left-right direction intersecting the air circulation direction. And an erected inner frame 44. And the holding member 40 has the crossing part 44a of the inner frame 44 located in the site | part which overlaps with the support end surface 27a of the support part 27, when attached to the division body 14, and this overlap crossing part 44a is substantially the support end surface 27a. The same shape (in the embodiment, a substantially circular shape) and the same size are formed. In addition, the holding member 40 has vertical and horizontal inner frames 44 intersecting at a position away from the support end surface 27a of the support portion 27 in addition to the overlapping intersection portion 44a.

  As shown in FIGS. 2 to 4, a second engagement portion 48 is formed on the outer frame 42 constituting the outer peripheral edge of the holding member 40 corresponding to the first engagement portion 22. The second engaging portion 48 is formed in a concave groove shape that opens outward, and the concave groove is continuous over the entire circumference of the outer frame 42. The holding member 40 sandwiches the sound absorbing member 30 disposed so as to cover the opening 20 between the first engaging portion 22 and the second engaging portion 48 of the divided body 14, and the insertion hole 30a and the mounting hole 46a. The fixing piece 26 is fixed to the divided body 14 by so-called heat caulking that crushes the tip of the mounting piece 26 that protrudes inward through heat. Here, when the holding member 40 is attached to the divided body 14, the concave second engaging portion 48 and the projecting first engaging portion 22 mesh with each other, and the two engaging portions 22, 48 are engaged. The sandwiched sound absorbing member 30 is pulled toward the outside in the opening surface direction of the opening 20 (see FIG. 9). The sound absorbing member 30 is held while the outer peripheral edge is sandwiched between the engaging portions 22 and 48 and is sandwiched between the mounting end surface 25 a of the mounting portion 25 and the mounting plate 46 of the holding member 40. In addition, the holding member 40 is formed so that the inner frame 44 is aligned with the opening surface of the opening 20 when attached to the divided body 14, or the inner frame 44 is positioned slightly outside the opening surface of the opening 20. Alternatively, the inner frame 44 can be positioned slightly inside the opening surface of the opening 20. For example, the holding member 40 can apply tension to the sound absorbing member 30 by pressing the sound absorbing member 30 covering the opening 20 with the inner frame 44 by disposing the inner frame 44 outside the opening surface of the opening 20. . Further, although the holding member 40 allows the vibration with a small width of the sound absorbing member 30 covering the opening 20 by disposing the inner frame 44 outside the opening surface of the opening 20, the holding member 40 has a large sound absorbing member 30. Deformation in the width can be restricted by contact with the inner frame 44. In the embodiment, the support end surface 27 a and the inner frame 44 of the support portion 27 are formed according to the opening surface of the opening portion 20, and the sound absorbing member 30 covering the opening portion 20 is formed between the support end surface 27 a of the support portion 27 and the inner frame 44. An inner frame 44 that is sandwiched and held between the overlapping intersections 44 a and extends to a position that is disengaged from the support portion 27 is in contact with the inner surface of the sound absorbing member 30.

[Operation of Example]
According to the intake duct 10, since the outside of the sound absorbing member 30 covering the opening 20 is covered and protected by the protective portion 24, the sound absorbing member 30 is attached when the intake duct 10 is attached or during vehicle maintenance. Generation | occurrence | production of problems, such as being damaged or the sound absorption member 30 shifting | deviating from the opening part 20, can be prevented. Moreover, since the opening part 20 and the sound absorbing member 30 are covered by the protection part 24, water enters from the outside into the air flow passage 12a of the intake duct 10 via the opening part 20 and the sound absorbing member 30 having air permeability. Can be prevented. The intake duct 10 uses a protective part 24 that is integrally formed with the passage part 18 that defines the air flow passage 12a, not a cover that is attached later as a means for protecting the outside of the sound absorbing member 30. Thereby, since the structure for attaching the means for protecting is not required, it is possible to avoid complication of the structure of the intake duct 10, and it is not necessary to retrofit the means for protecting. And since it is the structure which combines the division bodies 14 and 14 after attaching the sound-absorbing member 30 and the holding member 40 inside the division body 14, inside the sound absorption member 30 and the holding member 40 before assembling the division body 14 ( It can be easily attached with the air flow passage 12a side open. That is, according to the intake duct 10, the sound absorbing member 30 can be appropriately protected with a simple configuration and without any trouble. In addition, since the holding member 40 is attached to the attachment portion 25 that is integrally formed with the protection portion 24 so as to face the opening inside of the opening portion 20, the sound absorbing member 30 is effectively used in the space inside the protection portion 24. Alternatively, the space required for installing the holding member 40 can be reduced.

  When the holding member 40 is attached to the divided body 14 with the sound absorbing member 30 sandwiched between the opening 20, the outer peripheral edge of the sound absorbing member 30 is a concave second shape by the convex first engaging portion 22. By being pushed into the engaging portion 48, the sound absorbing member 30 is pulled toward the outside of the opening surface of the opening 20. Here, since the first engaging portion 22 and the second engaging portion 48 sandwich the outer peripheral edge of the sound absorbing member 30 over the entire circumference, the entire portion of the sound absorbing member 30 covering the opening 20 is tensioned in all directions. Is applied uniformly. In this way, the sound absorbing member 30 can be pulled appropriately with a simple configuration due to the unevenness of the engaging portions 22 and 48. According to the intake duct 10 of the embodiment, the sound absorbing member 30 can be vibrated according to the internal pressure fluctuation of the duct body 12 by applying an appropriate tension to the sound absorbing member 30 covering the opening 20. That is, since the sound absorbing member 30 functions as a so-called vibration film while having air permeability, a sound deadening effect as the vibration film is also obtained, and intake noise of the duct body 12 can be further reduced.

  The sound absorbing member 30 established in the opening 20 is positioned between the overlapping intersection 44 a of the inner frame 44 of the holding member 40 and the support end surface 27 a of the support 27. That is, if the sound absorbing member 30 is sandwiched between the overlapping intersection 44a and the support end surface 27a, the sound absorbing member 30 can be prevented from being deformed, and the sound absorbing member 30 is pushed by the overlapping intersection 44a or the support end surface 27a. The sound absorbing member 30 can be tensioned, and if the sound absorbing member 30 is separated from the overlapping intersection 44a and the support end surface 27a, the sound absorbing member 30 is allowed to vibrate with a small width, but the sound absorbing member 30 is deformed with a large width. Can be regulated by contact with the overlapping intersection 44a or the support end surface 27a. As described above, the sound absorbing member 30 required from the outside is changed by changing the aspect in which the position of the sound absorbing member 30 is regulated from the outside by the support portion 27 and the aspect in which the sound absorbing member 30 is regulated from the inside by the inner frame 44 of the holding member 40. It can be appropriately adjusted according to the flexibility of the sound absorbing member 30 to be disposed.

(Example of change)
The present invention is not limited to the configuration described above, and can be modified as follows.
(1) The attachment of the holding member is not limited to heat caulking, and other means such as mechanical fastening with a hole and a claw or adhesion may be used.
(2) You may provide small holes, such as a drain hole, in a protection part.
(3) In the embodiment, the sound absorbing member is sandwiched by the holding member and held in the divided body. However, the holding member is not used by bonding the sound absorbing member to the mounting portion or by thermally crimping the mounting piece of the mounting portion. The sound absorbing member may be directly attached to the attachment portion.

12 duct body, 12a air flow passage, 14A lower divided body (divided body),
14B Upper division body (division body), 16 opening part, 22 1st engaging part, 24 protection part,
25 mounting portion, 27 support portion, 27a support end face (end face), 30 sound absorbing member,
40 holding member, 42 outer frame, 44 inner frame, 44a overlapping intersection (intersection),
48 Second engaging portion

Claims (5)

In the intake duct constituted by a plurality of divided bodies in which end portions along the air flow direction of the air flow passage are assembled to each other, the cylindrical duct main body defining the air flow passage,
At least one of the plurality of divided bodies is
A sound-absorbing member comprising a sheet-like material having air permeability, and covering an opening formed in a wall portion defining the air flow passage from the air flow passage side;
A protective portion that is integrally formed with the wall portion so as to bulge outward from the wall portion, and covers the outside of the sound absorbing member at a distance from the sound absorbing member facing the opening;
An intake duct, comprising: an attachment portion that is formed integrally with the protection portion with the protection portion recessed inward and that supports a sound absorbing member that covers the opening portion from the outside.   The air intake duct according to claim 1, further comprising a holding member that is attached to the attachment portion with the sound absorbing member sandwiched from the air flow passage side and holds the sound absorbing member. The holding member includes a second engagement portion formed corresponding to a first engagement portion formed in an annular shape surrounding the opening in the divided body,
The holding member has the sound absorbing member that has the outer peripheral edge sandwiched between the first engaging portion and the second engaging portion by opening the sound absorbing member with the second engaging portion engaged with the first engaging portion. The intake duct according to claim 2, wherein the intake duct is attached to the attachment portion in a state of being pulled toward the outside of the opening surface. A support part formed integrally with the protection part by indenting the protection part inside;
The intake duct according to any one of claims 1 to 3, wherein the support portion is configured such that an end surface thereof faces an opening inside the opening at a position away from an opening edge of the opening.   The holding member is formed in a mesh shape having an annular outer frame aligned with the outer periphery of the opening and a plurality of inner frames extending so as to intersect the inner side of the outer frame, and the end surface of the support portion The air intake duct according to claim 4, further comprising an inner frame intersection formed in accordance with the inner frame.

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