JP5934607B2 - Air intake duct - Google Patents

Air intake duct Download PDF

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JP5934607B2
JP5934607B2 JP2012182718A JP2012182718A JP5934607B2 JP 5934607 B2 JP5934607 B2 JP 5934607B2 JP 2012182718 A JP2012182718 A JP 2012182718A JP 2012182718 A JP2012182718 A JP 2012182718A JP 5934607 B2 JP5934607 B2 JP 5934607B2
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opening
shielding member
duct
holding member
attachment
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JP2014040787A (en
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孝哉 手島
孝哉 手島
考一 保坂
考一 保坂
山口　貴史
貴史 山口
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Inoac Corp
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この発明は、車両におけるエンジンの吸気系に用いられる吸気ダクトに関するものである。   The present invention relates to an intake duct used for an intake system of an engine in a vehicle.

特許文献１のように、エンジンの吸気系で発生する吸気騒音の低減を図った吸気ダクトが提案されている。特許文献１の吸気ダクトは、ダクト本体の壁面に複数の開口を設け、この開口の外側を覆った吸音材を、ダクト本体に取り付けた保持部材で固定している。   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 material that covers the outside of the opening is fixed by a holding member attached to the duct body.

実公平６−１０１１６号公報Japanese Utility Model Publication No. 6-10116

前述した特許文献１の吸気ダクトは、開口を覆った吸音材がダクト本体内の吸気音を吸収することで、騒音を抑えている。そして、よりよい騒音低減効果を得るためには、ダクト本体の内部圧力変動(吸気音)に応じて、吸音材自体が振動する所謂振動膜を形成するように、吸音材を引っ張った状態でダクト本体に装着するのが好ましい。   In the intake duct of Patent Document 1 described above, the sound absorbing material covering the opening absorbs the intake sound in the duct body, thereby suppressing noise. And in order to obtain a better noise reduction effect, the duct with the sound absorbing material pulled so as to form a so-called vibration film in which the sound absorbing material itself vibrates according to the internal pressure fluctuation (intake sound) of the duct body. It is preferable to attach to the main body.

すなわち本発明は、従来の技術に係る吸気ダクトに内在する前記問題に鑑み、これらを好適に解決するべく提案されたものであって、効果的に吸気騒音を低減し得る吸気ダクトを提供することを目的とする。   That is, the present invention has been proposed to solve these problems inherently in the intake duct according to the prior art, and provides an intake duct that can effectively reduce intake noise. With the goal.

前記課題を克服し、所期の目的を達成するため、本願の請求項１に係る発明の吸気ダクトは、
ダクト本体の壁部に形成された開口部を、通気性を有する遮蔽部材で覆い、該遮蔽部材の外周縁を、ダクト本体に取り付けた保持部材で保持するよう構成した吸気ダクトにおいて、
前記開口部の全周を囲うように前記ダクト本体に形成された第１支持部と、
前記保持部材の外周縁全周に前記第１支持部に対応して形成され、該第１支持部と噛み合って前記遮蔽部材を開口部の開口面方向外側に向けて引っ張るように挟持する第２支持部と、
前記開口部に隣接して前記ダクト本体に複数形成され、該開口部における遮蔽部材で覆われる開口面より前記ダクト本体の内方に延在する取付部と、
前記取付部に対応して前記保持部材に形成され、該保持部材を前記開口部に押し付けるように前記ダクト本体の内方へ引き込んだ状態で該取付部に固定された取付片とを備え、
前記取付部は、前記第１支持部よりも前記開口部の開口面方向内側に設けられたことを要旨とする。
請求項１に係る発明によれば、開口部を覆う遮蔽部材に適度なテンションをかけることで、ダクト本体の内部圧力変動に応じて遮蔽部材を振動させることができるから、ダクト本体の吸気騒音をより低減することができる。また、取付部を第１支持部の内側に設けることで、保持部材を小型化できる。 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 configured to cover the opening formed in the wall portion of the duct body with a shielding member having air permeability and hold the outer peripheral edge of the shielding member with a holding member attached to the duct body,
A first support portion formed on the duct body so as to surround the entire circumference of the opening;
A second member is formed on the entire outer periphery of the holding member in correspondence with the first support part, and engages with the first support part to hold the shielding member so as to be pulled outward in the opening surface direction of the opening part. A support part;
A plurality of attachments formed in the duct body adjacent to the opening and extending inward of the duct body from an opening surface covered with a shielding member in the opening,
An attachment piece formed on the holding member corresponding to the attachment portion and fixed to the attachment portion in a state of being pulled inward of the duct main body so as to press the holding member against the opening ,
The gist is that the attachment portion is provided on the inner side in the opening surface direction of the opening portion than the first support portion .
According to the first aspect of the invention, since the shielding member can be vibrated according to the internal pressure fluctuation of the duct body by applying an appropriate tension to the shielding member covering the opening, the intake noise of the duct body is reduced. It can be further reduced. Moreover, a holding member can be reduced in size by providing an attaching part inside a 1st support part.

請求項２に係る発明では、前記遮蔽部材は、エンボス加工が施された不織布からなるシート状物であることを要旨とする。
請求項２に係る発明によれば、エンボス加工が施された不織布で遮蔽部材を構成することで、遮蔽部材の引っ張り強度を向上させることができ、遮蔽部材にテンションをかけて開口部を覆っても弛みにくい。 The gist of the invention according to claim 2 is that the shielding member is a sheet-like material made of an embossed nonwoven fabric.
According to the invention which concerns on Claim 2, the tensile strength of a shielding member can be improved by comprising a shielding member with the embossed nonwoven fabric, a tension | tensile_strength is applied to a shielding member, and an opening part is covered. It is hard to sag.

請求項３に係る発明では、前記第２支持部は、前記ダクト本体の外方に向けて開口する凹溝状に形成された第１支持部に対して、前記遮蔽部材を挟んで嵌り込む突条片を備えたことを要旨とする。
請求項３に係る発明によれば、両支持部の凹凸による簡単な構成で、遮蔽部材を適度に引っ張ることができる。 In the invention according to claim 3, the second support portion is a protrusion that is fitted into the first support portion formed in a concave groove shape that opens outward of the duct body with the shielding member interposed therebetween. The gist is that a strip is provided.
According to the invention which concerns on Claim 3, a shielding member can be pulled moderately with the simple structure by the unevenness | corrugation of both support parts.

本発明に係る吸気ダクトによれば、効果的に吸気騒音を低減し得る。   The intake duct according to the present invention can effectively reduce intake noise.

本発明の好適な実施例に係る吸気ダクトの一部を示す概略斜視図である。1 is a schematic perspective view showing a part of an intake duct according to a preferred embodiment of the present invention. 実施例の吸気ダクトの一部を分解して示す概略斜視図である。It is a schematic perspective view which decomposes | disassembles and shows a part of intake duct of an Example. (ａ)は図１のＡ−Ａ線断面図であり、(ｂ)は図１のＢ−Ｂ線断面図である。(a) is the sectional view on the AA line of FIG. 1, (b) is the sectional view on the BB line of FIG. 図１のＢ−Ｂ線に対応する断面で保持部材の取り付け過程を示す説明図である。It is explanatory drawing which shows the attachment process of a holding member in the cross section corresponding to the BB line of FIG.

次に、本発明に係る吸気ダクトにつき、好適な実施例を挙げて、添付図面を参照して以下に説明する。   Next, an intake duct according to the present invention will be described below with reference to the accompanying drawings by way of preferred embodiments.

図１および２に示すように、実施例に係る吸気ダクト１０は、筒状のダクト本体１２の周壁部(壁)に開口部１６が設けられ、この開口部１６を覆う遮蔽部材３０が該ダクト本体１２に取り付けられた保持部材４０で固定されている。実施例のダクト本体１２は、２つのダクト半体１２Ａ,１２Ｂを組み合わせて構成される。２つのダクト半体１２Ａ,１２Ｂは、爪と孔による係合などの機械的締結または接着などによって、ダクト本体１２における空気流通方向に延在する側縁部を互いに突き合わせて組み付けられる。なお、ダクト半体１２Ａ,１２Ｂは、ポリプロピレン(ＰＰ)または高密度ポリエチレン(ＨＤＰＥ)などの合成樹脂を材質とし、インジェクション成形等によって得られる成形品である。   As shown in FIGS. 1 and 2, the intake duct 10 according to the embodiment is provided with an opening 16 in a peripheral wall (wall) of a cylindrical duct body 12, and a shielding member 30 covering the opening 16 serves as the duct. It is fixed by a holding member 40 attached to the main body 12. The duct body 12 of the embodiment is configured by combining two duct halves 12A and 12B. The two duct halves 12A and 12B are assembled such that side edges extending in the air flow direction in the duct body 12 abut each other by mechanical fastening or adhesion such as engagement by a claw and a hole. The duct halves 12A and 12B are molded articles made of synthetic resin such as polypropylene (PP) or high-density polyethylene (HDPE) and obtained by injection molding or the like.

図２に示すように、前記開口部１６は、第１ダクト半体１２Ａにおいて壁部が外側に膨出するように形成された設置部１４に設けられている。開口部１６は、対向する開口縁間に縦横に架設された複数の区画片１８によって、ダクト本体１２の内外に連通する開口１６ａが区分された網目状に形成されている。また、設置部１４には、開口部１６の全周を囲うように第１支持部２０が形成されている。第１支持部２０は、外方に向けて開口する凹溝状に形成され、この溝が開口部１６の全周に亘って連なっている(図２参照)。そして、区画片１８は、第１支持部２０を構成する内側の壁(開口部１６を画成する壁)よりもダクト本体１２の内方に延在しており、遮蔽部材３０を該内側の壁に当接させて開口部１６を覆った際に、遮蔽部材３０と区画片１８との間に隙間ができる。更に、設置部１４には、開口部１６に隣接して複数(実施例では６箇所)の取付部２２が形成されている。取付部２２は、第１支持部２０よりも開口部１６の開口面方向内側に設けられ、区画片１８の間を塞ぐように、略矩形状の開口部１６の４隅および長手方向に沿う側部中央部に配置されている。そして、各取付部２２は、開口部１６におけるダクト本体１２の外方に臨む開口面(第１支持部２０を構成する内側の壁)および区画片１８よりも、ダクト本体１２の内方に延在するよう構成され、保持部材４０の取り付け時に該保持部材４０の内面との間に隙間を画成し得るようになっている(図３参照)。各取付部２２には、ダクト本体１２の内外方向(板状の取付部２２の厚み方向)に貫通する取付孔２４が形成されている。   As shown in FIG. 2, the opening 16 is provided in the installation portion 14 formed so that the wall portion bulges outward in the first duct half body 12 </ b> A. The opening 16 is formed in a mesh shape in which openings 16 a communicating with the inside and outside of the duct body 12 are divided by a plurality of partition pieces 18 which are installed vertically and horizontally between opposed opening edges. In addition, a first support portion 20 is formed in the installation portion 14 so as to surround the entire circumference of the opening portion 16. The first support portion 20 is formed in a concave groove shape that opens outward, and this groove is continuous over the entire circumference of the opening portion 16 (see FIG. 2). The partition piece 18 extends inward of the duct body 12 from the inner wall (the wall defining the opening 16) constituting the first support portion 20, and the shielding member 30 is disposed on the inner side. A gap is formed between the shielding member 30 and the partition piece 18 when the opening 16 is covered with the wall. Furthermore, a plurality (6 in the embodiment) of attachment portions 22 are formed in the installation portion 14 adjacent to the opening 16. The attachment portion 22 is provided on the inner side in the opening surface direction of the opening portion 16 relative to the first support portion 20, and is along the four corners and the longitudinal direction of the substantially rectangular opening portion 16 so as to close the space between the partition pieces 18. It is arranged in the central part. Each attachment portion 22 extends inward of the duct body 12 from the opening surface (inner wall constituting the first support portion 20) and the partition piece 18 facing the outside of the duct body 12 in the opening portion 16. It is configured so that a gap can be defined between the holding member 40 and the inner surface of the holding member 40 (see FIG. 3). Each attachment portion 22 is formed with an attachment hole 24 penetrating in the inner and outer directions of the duct body 12 (in the thickness direction of the plate-like attachment portion 22).

前記遮蔽部材３０は、通気性を有する不織布からなるシート状物であり、開口部１６および該開口部１６を囲う第１支持部２０を少なくとも覆い得る大きさに設定されている。また、遮蔽部材３０は、撥水剤や止水剤などの表面処理等により撥水性および止水性を有している。ここで、不織布は、ポリエステル系繊維やポリプロピレン系繊維などの熱可塑性樹脂繊維からなり、スパンボンド法などによって得られるものを用いることができ、特に限定されないが７０ｇ／ｍ２〜３００ｇ／ｍ２の目付量であるのが好ましい。また、不織布は、所要パターンで型押しすることで、熱可塑性樹脂繊維が溶融して圧着した圧着部分と、圧着されていないまたは該圧着部分よりも圧着度合いが小さい一般部分とを設ける所謂エンボス加工が施されている。実施例の遮蔽部材３０には、線状の圧着部分が互いに交わる格子状に延在するようにエンボス加工が施され、この圧着部分によって引っ張り強度が向上されると共に伸び難くなっている。また、遮蔽部材３０は、エンボス加工による凹凸により表面積を大きくすることができる。遮蔽部材３０には、保持部材４０の後述する取付片４８が挿通可能な挿通孔３２が、該取付片４８に対応して厚み方向に貫通形成されている。挿通孔３２は、後述する第１支持部２０と第２支持部４４との噛み合いによる遮蔽部材３０の引っ張りを阻害しないように、取付片４８より大きく形成されている。 The shielding 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 16 and the first support portion 20 surrounding the opening 16. The shielding member 30 has water repellency and water repellency by surface treatment such as a water repellent and a water repellant. Here, the nonwoven fabric is made of thermoplastic resin fibers such as polyester fibers and polypropylene fibers, it can be used those obtained by such spunbond method, not particularly limited in the 70g / m 2 ~300g / m 2 A basis weight is preferred. 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 shielding member 30 according to the embodiment is embossed so that the linear crimping portions extend in a lattice pattern where the linear crimping portions intersect with each other, and the crimping strength is improved and the elongation is difficult. Further, the shielding member 30 can have a large surface area due to unevenness by embossing. In the shielding member 30, an insertion hole 32 through which a mounting piece 48, which will be described later, of the holding member 40 can be inserted is formed so as to penetrate in the thickness direction corresponding to the mounting piece 48. The insertion hole 32 is formed larger than the attachment piece 48 so as not to hinder the pulling of the shielding member 30 due to the engagement of the first support portion 20 and the second support portion 44 described later.

前記保持部材４０は、開口部１６の外側を囲う第１支持部２０よりも一回り大きく形成された板状部材であり、ダクト半体１２Ａ,１２Ｂと同様に樹脂成形品が用いられている。保持部材４０は、前記開口部１６の区画片１８に合わせて縦横に架設された複数の保持片４２によって、該保持部材４０の表裏に連通する通口４０ａが区分された網目状に形成される。保持部材４０は、該保持部材４０を設置部１４に取り付けた際に、通口４０ａが開口部１６の開口１６ａに整合してダクト本体１２の内外方向に連通するようになっている。保持部材４０の外周縁には、第２支持部４４が第１支持部２０に対応して形成され、保持部材４０を設置部１４に取り付けた際に、第１支持部２０と噛み合って遮蔽部材３０を開口部１６の開口面方向外側に向けて引っ張るように挟持するように構成される。ここで、保持部材４０には、第２支持部４４として、該保持部材４０の外周縁裏面から突出する突条片が該外周縁全周に亘って形成され、この突条片が第１支持部２０に嵌合するようになっている。また、保持部材４０の外周端裏面には、壁片４６が該外周縁全周に連ねて突出形成されている。そして、保持部材４０は、設置部１４に取り付けた際に、第２支持部４４の外側に離間して延在する壁片４６が、溝状の第１支持部２０を画成する外側の壁(設置部１４の外壁面)の外周を囲うようになっている。そして、保持部材４０を設置部に取り付けた状態において保持片４２は、第１支持部２０を構成する内側の壁よりもダクト本体１２の外方に延在しており、遮蔽部材３０を該内側の壁に当接させて開口部１６を覆った際に、遮蔽部材３０と保持片４２との間に隙間ができる。   The holding member 40 is a plate-like member that is formed to be slightly larger than the first support portion 20 that surrounds the outside of the opening portion 16, and a resin molded product is used in the same manner as the duct halves 12A and 12B. The holding member 40 is formed in a mesh shape in which through holes 40 a communicating with the front and back of the holding member 40 are divided by a plurality of holding pieces 42 which are installed vertically and horizontally in accordance with the partition pieces 18 of the opening 16. . When the holding member 40 is attached to the installation portion 14, the through hole 40 a is aligned with the opening 16 a of the opening 16 and communicates in the inside and outside of the duct body 12. A second support portion 44 is formed on the outer peripheral edge of the holding member 40 so as to correspond to the first support portion 20. When the holding member 40 is attached to the installation portion 14, the second support portion 44 meshes with the first support portion 20 and is a shielding member. It is comprised so that 30 may be clamped so that it may pull toward the opening surface direction outer side of the opening part 16. As shown in FIG. Here, on the holding member 40, as the second support portion 44, a protrusion piece protruding from the rear surface of the outer peripheral edge of the holding member 40 is formed over the entire outer peripheral edge, and this protrusion piece is the first support. It fits into the part 20. Further, a wall piece 46 is formed on the outer peripheral end back surface of the holding member 40 so as to protrude from the entire outer peripheral edge. When the holding member 40 is attached to the installation part 14, the wall piece 46 that extends away from the outside of the second support part 44 forms an outer wall that defines the groove-shaped first support part 20. The outer periphery of the (outer wall surface of the installation part 14) is enclosed. And in the state which attached the holding member 40 to the installation part, the holding piece 42 is extended outside the duct main body 12 rather than the inner wall which comprises the 1st support part 20, and the shielding member 30 is this inner side. A gap is formed between the shielding member 30 and the holding piece 42 when the opening 16 is covered with the wall.

前記保持部材４０には、設置部１４に形成された複数の取付部２２の夫々に対応して複数の取付片４８が形成されている(図４(ａ)参照)。各取付片４８は、保持部材４０の裏面から突出した棒状に形成される。また、取付片４８は、第２支持部４４よりも大きく突出するように設定され、開口部１６の開口面よりも内方に位置する取付部２２の取付孔２４に挿入可能で、かつ挿入した取付片４８の先端が取付部２２から突出するよう構成される。保持部材４０は、遮蔽部材３０の挿通孔３２から突き出た取付片４８を対応の取付孔２４に挿入し、取付部２２から内方へ突出した取付片４８の先端を熱によって潰す熱カシメなどにより、取付片４８を取付部２２に固定することで、設置部１４に取り付けられる(図３参照)。ここで、保持部材４０は、取付片４８を取付部２２に固定する際に、取付片４８をダクト本体１２の内方へ引き込むように力を加えたり、または保持部材４０自体を設置部１４に押さえ付けること等により、保持部材４０を設置部１４に押し付けるように付勢された状態で取り付けられる。   A plurality of attachment pieces 48 are formed on the holding member 40 corresponding to the plurality of attachment portions 22 formed on the installation portion 14 (see FIG. 4A). Each attachment piece 48 is formed in a rod shape protruding from the back surface of the holding member 40. Further, the attachment piece 48 is set so as to protrude larger than the second support portion 44, and can be inserted into the attachment hole 24 of the attachment portion 22 located inward of the opening surface of the opening portion 16. The tip of the attachment piece 48 is configured to protrude from the attachment portion 22. The holding member 40 inserts the attachment piece 48 protruding from the insertion hole 32 of the shielding member 30 into the corresponding attachment hole 24, and heat caulking or the like that crushes the tip of the attachment piece 48 protruding inward from the attachment portion 22 with heat. The mounting piece 48 is fixed to the mounting portion 22 to be mounted on the installation portion 14 (see FIG. 3). Here, the holding member 40 applies a force to pull the attachment piece 48 inward of the duct body 12 when fixing the attachment piece 48 to the attachment portion 22, or the holding member 40 itself is attached to the installation portion 14. The holding member 40 is attached in a state of being urged so as to be pressed against the installation portion 14 by pressing or the like.

〔実施例の作用〕
次に、実施例に係る吸気ダクト１０の作用について説明する。保持部材４０を開口部１６との間に遮蔽部材３０を挟んで設置部１４に取り付けた際には、遮蔽部材３０の外周縁が凸状の第２支持部４４によって凹状の第１支持部２０に押し込まれることで、遮蔽部材３０が開口部１６の開口面外側に向けて引っ張られる(図４(ｂ)参照)。ここで、第１支持部２０および第２支持部４４が遮蔽部材３０の外周縁を全周に亘って挟持するので、遮蔽部材３０における開口部１６を覆う部分全体に四方に向けてテンションが一様にかけられる。このように、両支持部２０,４４の凹凸による簡単な構成で、遮蔽部材３０を適度に引っ張ることができる。また、取付部２２が開口部１６の開口面よりも下がっているので、保持部材４０の裏面が遮蔽部材３０を挟んで開口部１６に位置規制されても、取付部２２と保持部材４０の裏面との間の隙間を用いて取付片４８をダクト本体１２の内方へ引き込むことができる。従って、第２支持部４４を第１支持部２０により強く押し込むことが可能であるので、遮蔽部材３０により強くテンションをかけることができる。そして、遮蔽部材３０は、エンボス加工が施されて伸び難くなっているから、第１支持部２０と第２支持部４４との噛み合いによって強く引っ張られても伸びず、遮蔽部材３０を開口１６ａに合わせてゆるみなく張ることができる。なお、取付部２２を第１支持部２０の内側に設けることで、保持部材４０を小型化できる。 (Effects of Example)
Next, the operation of the intake duct 10 according to the embodiment will be described. When the holding member 40 is attached to the installation part 14 with the shielding member 30 sandwiched between the opening 16 and the first support part 20, the outer peripheral edge of the shielding member 30 is concaved by the convex second support part 44. As a result, the shielding member 30 is pulled toward the outside of the opening surface of the opening 16 (see FIG. 4B). Here, since the first support portion 20 and the second support portion 44 sandwich the outer peripheral edge of the shielding member 30 over the entire circumference, the entire portion of the shielding member 30 covering the opening 16 is tensioned in all directions. It is hung like. In this way, the shielding member 30 can be pulled appropriately with a simple configuration by the unevenness of the support portions 20 and 44. Further, since the attachment portion 22 is lower than the opening surface of the opening portion 16, even if the back surface of the holding member 40 is restricted by the opening portion 16 with the shielding member 30 interposed therebetween, the attachment portion 22 and the back surface of the holding member 40 The attachment piece 48 can be pulled inward of the duct main body 12 using a gap between them. Accordingly, since the second support portion 44 can be pushed in more strongly by the first support portion 20, a stronger tension can be applied to the shielding member 30. Since the shielding member 30 is embossed and difficult to stretch, the shielding member 30 does not extend even if it is strongly pulled by the engagement of the first support portion 20 and the second support portion 44, and the shielding member 30 is opened to the opening 16a. It can be stretched without loosening. In addition, the holding member 40 can be reduced in size by providing the attachment part 22 inside the 1st support part 20. FIG.

実施例の吸気ダクト１０によれば、開口１６ａを覆う遮蔽部材３０に適度なテンションがかけることで、ダクト本体１２の内部圧力変動に応じて遮蔽部材３０を振動させることができる。すなわち、遮蔽部材３０が通気性を有する吸音材でありながら所謂振動膜としても機能するので、該振動膜としての消音効果も得られ、ダクト本体１２の吸気騒音をより低減することができる。ここで、吸気ダクト１０は、開口部１６を覆った遮蔽部材３０に対して、該開口部１６に延在する区画片１８がダクト本体１２の内方に離間すると共に保持部材４０の保持片４２がダクト本体１２の外方に離間している。従って、遮蔽部材３０は、区画片１８および保持片４２との間の隙間で振動が許容され、前記振動膜としての好適な消音効果が得られる。そして、エンボス加工が施された不織布で遮蔽部材３０を構成することで、遮蔽部材３０の引っ張り強度を向上させることができ、遮蔽部材３０にテンションをかけて開口部１６を覆っても弛みにくい。このため、遮蔽部材３０による騒音低減効果を長持ちさせることができる。   According to the intake duct 10 of the embodiment, the shielding member 30 can be vibrated according to the internal pressure fluctuation of the duct body 12 by applying an appropriate tension to the shielding member 30 covering the opening 16a. That is, since the shielding member 30 is a sound absorbing material having air permeability, it also functions as a so-called vibration film, so that a silencing effect as the vibration film can be obtained and intake noise of the duct body 12 can be further reduced. Here, in the intake duct 10, the partition piece 18 extending to the opening portion 16 is separated from the inside of the duct body 12 and the holding piece 42 of the holding member 40 with respect to the shielding member 30 covering the opening portion 16. Is spaced outward from the duct body 12. Therefore, the shielding member 30 is allowed to vibrate in the gap between the partition piece 18 and the holding piece 42, and a suitable silencing effect as the vibration film can be obtained. Then, by forming the shielding member 30 with the embossed nonwoven fabric, the tensile strength of the shielding member 30 can be improved, and even if the shielding member 30 is tensioned and the opening 16 is covered, it is difficult to loosen. For this reason, the noise reduction effect by the shielding member 30 can be prolonged.

(変更例)
前述した構成に限定されず、以下のように変更することも可能である。
(１)保持部材の取り付けは、熱カシメに限定されず、孔と爪とによる機械的な締結、または接着などその他の手段を用いてもよい。 (Change example)
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.

１２ ダクト本体，１６ 開口部，２０ 第１支持部，２２ 取付部，３０ 遮蔽部材，
４０ 保持部材，４４ 第２支持部，４８ 取付片 12 duct body, 16 opening, 20 first support part, 22 mounting part, 30 shielding member,
40 holding member, 44 second support portion, 48 mounting piece

Claims (3)

ダクト本体の壁部に形成された開口部を、通気性を有する遮蔽部材で覆い、該遮蔽部材の外周縁を、ダクト本体に取り付けた保持部材で保持するよう構成した吸気ダクトにおいて、
前記開口部の全周を囲うように前記ダクト本体に形成された第１支持部と、
前記保持部材の外周縁全周に前記第１支持部に対応して形成され、該第１支持部と噛み合って前記遮蔽部材を開口部の開口面方向外側に向けて引っ張るように挟持する第２支持部と、
前記開口部に隣接して前記ダクト本体に複数形成され、該開口部における遮蔽部材で覆われる開口面より前記ダクト本体の内方に延在する取付部と、
前記取付部に対応して前記保持部材に形成され、該保持部材を前記開口部に押し付けるように前記ダクト本体の内方へ引き込んだ状態で該取付部に固定された取付片とを備え、
前記取付部は、前記第１支持部よりも前記開口部の開口面方向内側に設けられた
ことを特徴とする吸気ダクト。 In the intake duct configured to cover the opening formed in the wall portion of the duct body with a shielding member having air permeability and hold the outer peripheral edge of the shielding member with a holding member attached to the duct body,
A first support portion formed on the duct body so as to surround the entire circumference of the opening;
A second member is formed on the entire outer periphery of the holding member in correspondence with the first support part, and engages with the first support part to hold the shielding member so as to be pulled outward in the opening surface direction of the opening part. A support part;
A plurality of attachments formed in the duct body adjacent to the opening and extending inward of the duct body from an opening surface covered with a shielding member in the opening,
An attachment piece formed on the holding member corresponding to the attachment portion and fixed to the attachment portion in a state of being pulled inward of the duct main body so as to press the holding member against the opening ,
The air intake duct , wherein the attachment portion is provided on the inner side in the opening surface direction of the opening portion than the first support portion . 前記遮蔽部材は、エンボス加工が施された不織布からなるシート状物である請求項１記載の吸気ダクト。   The air intake duct according to claim 1, wherein the shielding member is a sheet-like material made of a nonwoven fabric subjected to embossing. 前記第２支持部は、前記ダクト本体の外方に向けて開口する凹溝状に形成された第１支持部に対して、前記遮蔽部材を挟んで嵌り込む突条片を備えた請求項１または２記載の吸気ダクト。   The said 2nd support part was provided with the protrusion piece fitted on both sides of the said shielding member with respect to the 1st support part formed in the concave groove shape opened toward the outward of the said duct main body. Or the intake duct of 2.
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