JP7256054B2 - Duct and manufacturing method thereof, foam for duct - Google Patents

Duct and manufacturing method thereof, foam for duct Download PDF

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JP7256054B2
JP7256054B2 JP2019061902A JP2019061902A JP7256054B2 JP 7256054 B2 JP7256054 B2 JP 7256054B2 JP 2019061902 A JP2019061902 A JP 2019061902A JP 2019061902 A JP2019061902 A JP 2019061902A JP 7256054 B2 JP7256054 B2 JP 7256054B2
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opening
porous body
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進一 本澤
貴史 山口
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Inoac Corp
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この発明は、例えば車両などに用いられるダクトおよびこのダクトの製造方法に関するものである。 TECHNICAL FIELD The present invention relates to a duct used, for example, in a vehicle and a method of manufacturing the duct.

特許文献1に開示の吸気ダクトのように、吸気ダクトを構成する分割体の壁面に形成された開口部を覆うように、多孔質シートを分割体に接合することで、騒音を防止することが提案されている。特許文献1の吸気ダクトは、多孔質シートをセットした成形型において分割体を成形するインサート成形により、多孔質シートを分割体に接合している。具体的には、成形型の凹型に多孔質シートをセットし、凹型と凸型とを型閉じすることで、凸型から突出する固定部によって多孔質シートの外縁部の内周側の部分を圧迫して凹型に押さえ付ける。次に、多孔質シートを配置した成形型のキャビティに溶融樹脂を注入する。このとき、多孔質シートには、溶融樹脂が多孔質シートの外縁部から徐々に含浸するが、外縁部の内周側が固定部と凹型とにより挟持されているので、内周側へ溶融樹脂が含浸することが防止される。そして、多孔質シートの外縁部に溶融樹脂を含浸させた状態で冷却すると、多孔質シートに侵入した樹脂による接合部が形成される。こうして、多孔質シートは、固化した樹脂からなる分割体と接合される。 Like the air intake duct disclosed in Patent Document 1, noise can be prevented by joining a porous sheet to the divided body so as to cover the opening formed in the wall surface of the divided body constituting the air intake duct. Proposed. In the air intake duct of Patent Document 1, the porous sheet is joined to the divided body by insert molding in which the divided body is molded in a mold in which the porous sheet is set. Specifically, the porous sheet is set in the concave mold of the molding die, and the concave mold and the convex mold are closed, so that the inner peripheral side of the outer edge of the porous sheet is fixed by the fixing part protruding from the convex mold. Squeeze into a concave shape. Next, molten resin is injected into the mold cavity in which the porous sheet is arranged. At this time, the porous sheet is gradually impregnated with the molten resin from the outer edge of the porous sheet. Impregnation is prevented. When the perimeter of the porous sheet impregnated with the molten resin is cooled, a joint is formed by the resin that has penetrated into the porous sheet. In this way, the porous sheet is joined to the divided body made of the solidified resin.

特開2002-106431号公報JP-A-2002-106431

多孔質シートとして、弾性を有する素材を用いると、成形型において凸型の固定部と凹型との間で挟持されていた多孔質シートの内周側が、その弾性により成形型から脱型した際に元の形状に復元する。このとき、多孔質シートが、開口部から吸気ダクトの内側に大きく入り込むように復元することがある。多孔質シートがダクトの内側へ入り込んでしまうと、空気流通路の断面積が減少することになり、圧力損失が大きくなるなどの問題が生じる。 When a material having elasticity is used for the porous sheet, the inner peripheral side of the porous sheet sandwiched between the convex fixing portion and the concave mold in the mold is released from the mold due to its elasticity. Restore to original shape. At this time, the porous sheet may be restored so as to greatly enter the inside of the air intake duct from the opening. If the porous sheet enters the inside of the duct, the cross-sectional area of the airflow passage will be reduced, causing problems such as increased pressure loss.

本発明は、従来の技術に係る前記問題に鑑み、これらを好適に解決するべく提案されたものであって、開口部を覆う多孔質体が、開口部からダクト内に大きく膨らむことが抑えられたダクトおよびその製造方法を提供することを目的とする。 SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems associated with the prior art, and is intended to preferably solve these problems. An object of the present invention is to provide a duct and a manufacturing method thereof.

前記課題を克服し、所期の目的を達成するため、本発明に係るダクトは、
ダクトにおいて空気流通路を画成する合成樹脂成形品であるダクト壁部と、
弾性を有し、前記ダクト壁部を貫通するように形成された開口部を塞ぐように該ダクト壁部の外面に接合された多孔質体と、を備え、
前記多孔質体は、前記開口部の開口縁に接合される接合部分に対して該開口部の開口領域側に隣接する隣接部分の少なくとも一部が、前記ダクト壁部に接合する前の状態において、該開口部の開口領域中央部に対応する一般部分よりも薄く形成されていることを要旨とする。
In order to overcome the above problems and achieve the intended purpose, the duct according to the present invention is
a duct wall portion that is a synthetic resin molding that defines an air flow passage in the duct;
a porous body having elasticity and joined to the outer surface of the duct wall so as to block an opening formed to penetrate the duct wall;
In the porous body, at least a portion of the adjacent portion adjacent to the opening region side of the opening with respect to the bonding portion bonded to the opening edge of the opening is in a state before bonding to the duct wall portion. , is formed thinner than the general portion corresponding to the central portion of the opening region of the opening.

前記課題を克服し、所期の目的を達成するため、本発明に係るダクトの製造方法は、
合成樹脂からなるダクト壁部を成形型で成形する際に、弾性を有する多孔質体を、該ダクト壁部に貫通形成される開口部を塞ぐように該ダクト壁部の一面に接合するダクトの製造方法であって、
前記多孔質体において前記ダクト壁部に接合させる接合部分に隣接する隣接部分の少なくとも一部を、その板厚が、前記開口部の開口領域中央部に対応する一般部分よりも薄くなるように形成し、
前記隣接部分を前記成形型で板厚方向に挟んで圧縮した状態で、前記多孔質体を該成形型に収め、
前記接合部分が臨む前記成形型のキャビティに、溶融状態にある前記合成樹脂を供給し、圧縮された前記隣接部分によって該合成樹脂を封止しつつ該キャビティにおいて前記開口部を有する前記ダクト壁部を成形することで、前記多孔質体の接合部分と該ダクト壁部とを接合することを要旨とする。
In order to overcome the above problems and achieve the intended purpose, the method for manufacturing a duct according to the present invention comprises:
When molding a duct wall made of synthetic resin with a mold, an elastic porous body is joined to one surface of the duct wall so as to block an opening penetrating through the duct wall. A manufacturing method comprising:
At least a portion of the adjacent portion of the porous body that is adjacent to the joint portion to be joined to the duct wall portion is formed so that the plate thickness thereof is thinner than the general portion corresponding to the central portion of the opening region of the opening. death,
The porous body is placed in the mold in a state where the adjacent portion is sandwiched between the molds and compressed in the plate thickness direction,
The duct wall portion having the opening in the cavity while the synthetic resin in a molten state is supplied to the cavity of the mold facing the joint portion, and the synthetic resin is sealed by the compressed adjacent portion. The gist is that the joint portion of the porous body and the duct wall portion are joined by molding.

本発明に係るダクトによれば、開口部を覆う多孔質体が、開口部からダクト内に大きく膨らむことが抑えられている。
本発明に係るダクトの製造方法によれば、開口部を覆う多孔質体が、開口部からダクト内に大きく膨らむことが抑えられたダクトを得ることができる。
According to the duct of the present invention, the porous body covering the opening is prevented from bulging into the duct from the opening.
According to the method of manufacturing a duct according to the present invention, it is possible to obtain a duct in which the porous body covering the opening is prevented from bulging into the duct from the opening.

本発明の実施例に係るダクトを示す概略斜視図である。1 is a schematic perspective view showing a duct according to an embodiment of the invention; FIG. 実施例に係るダクトの要部を示す概略斜視図である。なお、多孔質体を取り外してある。FIG. 3 is a schematic perspective view showing a main part of the duct according to the example; Note that the porous body is removed. 図1のA-A線断面図である。FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; 図1のB-B線断面図である。FIG. 2 is a cross-sectional view taken along line BB of FIG. 1; 実施例のダクトの製造工程を示す説明図である。It is explanatory drawing which shows the manufacturing process of the duct of an Example. 実施例のダクトの製造工程を示す説明図である。It is explanatory drawing which shows the manufacturing process of the duct of an Example. 変更例の多孔質体によるダクトの製造工程を示す説明図である。It is explanatory drawing which shows the manufacturing process of the duct by the porous body of a modification.

次に、本発明に係るダクトおよびこのダクトの製造方法につき、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。 BEST MODE FOR CARRYING OUT THE INVENTION Next, the duct according to the present invention and the method for manufacturing the duct will be described below with reference to preferred embodiments and with reference to the accompanying drawings.

図1に示すように、実施例に係るダクト10は、空気が流通する空気流通路12が内側に設けられた筒状体である。実施例のダクト10は、複数(実施例は2個)の分体14,16を組み合わせて筒状に構成されており、互いの端縁を突き合わせた分体14,16同士が、図示しない爪嵌合構造や接着などによって組み付けられている。各分体14,16は、ポリプロピレン(PP)または高密度ポリエチレン(HDPE)などのソリッド樹脂(ソリッドの合成樹脂)を材質とし、インジェクション成形等によって得られる合成樹脂成形品である。ダクト10は、空気流通路12に向く側を内といい、その反対側を外という。 As shown in FIG. 1, the duct 10 according to the embodiment is a cylindrical body provided with an air flow passage 12 through which air flows. The duct 10 of the embodiment is configured in a cylindrical shape by combining a plurality of split bodies 14 and 16 (two in the embodiment). It is assembled by a fitting structure, adhesion, or the like. Each of the split bodies 14 and 16 is made of a solid resin (solid synthetic resin) such as polypropylene (PP) or high density polyethylene (HDPE), and is a synthetic resin molded product obtained by injection molding or the like. The side of the duct 10 facing the air flow passage 12 is called the inside, and the opposite side is called the outside.

図2~図4に示すように、ダクト10は、空気流通路12を画成するダクト壁部10aを貫通するように形成された開口部18と、この開口部18を塞ぐようにダクト壁部10aの外面に接合された多孔質体20とを備えている。ダクト10は、開口部18を塞ぐ多孔質体20が、その特性により、吸音や断熱や軽量化などの機能を有する機能部となり、実施例の多孔質体20は、バッテリを冷却する空気を案内する冷却ダクトにおいて、空気を吸い込むブロアなどによる騒音が、空気取入口側から漏れないように防止する吸音部として設定されている。実施例のダクト10は、開口部18および多孔質体20が第1分体14に設けられており、合成樹脂からなる第1分体14の成形時に、開口部18が形成されると共に、多孔質体20がダクト壁部10aに接合される。 As shown in FIGS. 2 to 4, the duct 10 includes an opening 18 penetrating the duct wall 10a defining the air flow passage 12, and a duct wall covering the opening 18. and a porous body 20 bonded to the outer surface of 10a. In the duct 10, the porous body 20 that closes the opening 18 serves as a functional part having functions such as sound absorption, heat insulation, and weight reduction due to its characteristics, and the porous body 20 of the embodiment guides the air that cools the battery. In the cooling duct, it is set as a sound absorbing portion that prevents noise caused by a blower or the like sucking air from leaking from the air intake side. In the duct 10 of the embodiment, the opening 18 and the porous body 20 are provided in the first split body 14. When the first split body 14 made of synthetic resin is molded, the opening 18 is formed and the porous body 20 is formed. A mass 20 is joined to the duct wall 10a.

多孔質体20は、圧縮して変形させた状態を解除すると元の形状に戻る弾性を有している。また、前述した吸音用途であるならば、通気性を有しているとよい。多孔質体20は、例えば、ポリウレタンフォームや、ポリプロピレンフォーム等のオレフィン系フォームなどの発泡体、あるいはセルとなる核剤を抽出する抽出法によって製造されるものなどを用いることができる。この中でも、連続気泡構造のポリウレタンフォームを用いることが好ましい。なお、実施例では、多孔質体20として、50%圧縮後の復元率が92%以上の連続気泡構造のポリウレタンフォームを用いている。 The porous body 20 has elasticity such that it returns to its original shape when the compressed and deformed state is released. Moreover, if it is for the above-mentioned sound absorbing use, it is preferable that the material has air permeability. For the porous body 20, for example, a polyurethane foam, a foam such as an olefinic foam such as a polypropylene foam, or a material manufactured by an extraction method for extracting a nucleating agent for forming cells can be used. Among these, it is preferable to use a polyurethane foam having an open cell structure. In the examples, a polyurethane foam having an open-cell structure having a recovery rate of 92% or more after 50% compression is used as the porous body 20 .

図2に示すように、ダクト壁部10aは、開口部18に架け渡すように形成された桟部22を備え、桟部22によって開口部18が複数(実施例は2つ)の開口領域18aに区分されている。多孔質体20は、ダクト壁部10aにおける開口部18の開口縁および桟部22に接合されており、開口縁に接合する外周接合部分24aおよび桟部22に接合する桟部接合部分24bが、開口領域18aの中央部に対応する一般部分26よりも薄くなっている。なお、外周接合部分24aおよび桟部接合部分24bを区別しない場合、単に接合部分という。多孔質体20は、一般部分26が、接合部分24a,24bよりもダクト壁部10aと反対側へ張り出すように形成されている(図3および図4参照)。また、多孔質体20は、開口部18を塞ぐダクト壁部10a側の内面が、空気取入口から空気送出口に向かう空気流通方向において、周辺のダクト壁部10aに倣うように延在し、開口部18を塞ぐ面によって周辺と連続する空気案内面を構成している。多孔質体20の接合部分24a,24bは、ダクト壁部10aの成形時に接合される。このため、ダクト壁部10aとなる溶融状態の合成樹脂R(図6(a))との接触により接合部分24a,24bが融解して、ダクト壁部10aとこのダクト壁部10aに接合した接合部分24a,24bとは融合した状態にある。なお、図中では、多孔質体20の接合部分24a,24bとダクト壁部10aとの境界を便宜的に示しているが、互いの境界が曖昧になっていると考えられる。 As shown in FIG. 2, the duct wall portion 10a includes a crosspiece 22 formed to span the openings 18, and the crosspieces 22 form an opening region 18a in which a plurality of openings 18 (two in this embodiment) are formed. are divided into The porous body 20 is joined to the opening edge of the opening 18 in the duct wall portion 10a and the crosspiece portion 22, and the outer peripheral joint portion 24a that joins the opening edge and the crosspiece portion joint portion 24b that joins the crosspiece portion 22 are: It is thinner than the general portion 26 corresponding to the central portion of the opening region 18a. In addition, when not distinguishing between the outer peripheral joint portion 24a and the crosspiece joint portion 24b, they are simply referred to as joint portions. The porous body 20 is formed such that the general portion 26 protrudes from the joint portions 24a and 24b to the side opposite to the duct wall portion 10a (see FIGS. 3 and 4). In addition, the porous body 20 has an inner surface on the side of the duct wall 10a that closes the opening 18, in the direction of air flow from the air intake to the air delivery port, so as to follow the surrounding duct wall 10a, The surface that closes the opening 18 constitutes an air guide surface that is continuous with the surroundings. The joint portions 24a and 24b of the porous body 20 are joined when the duct wall portion 10a is formed. For this reason, the joint portions 24a and 24b are melted by contact with the molten synthetic resin R (FIG. 6(a)) that forms the duct wall portion 10a, and the duct wall portion 10a and the duct wall portion 10a are joined together. The parts 24a, 24b are in a fused state. In the drawing, the boundaries between the joint portions 24a and 24b of the porous body 20 and the duct wall portion 10a are shown for convenience, but it is considered that the mutual boundaries are ambiguous.

図5(a)に示すように、多孔質体20は、開口部18の開口縁に接合される外周接合部分24aに対して該開口部18の開口領域18a側に隣接する隣接部分28の少なくとも一部が、ダクト壁部10aに接合する前の状態において、一般部分26よりも薄く形成される。実施例の多孔質体20は、外周接合部分24aから隣接部分28にかけて、ダクト壁部10aに接合する前の状態において、一般部分26よりも薄く形成されている。また、実施例の多孔質体20は、4辺の開口縁に対応する外周接合部分24aに隣接する隣接部分28の全てが、ダクト壁部10aに接合する前の状態において、一般部分26よりも薄く形成されている。 As shown in FIG. 5( a ), the porous body 20 is at least adjacent to the adjacent portion 28 adjacent to the opening region 18 a side of the opening 18 with respect to the outer peripheral joint portion 24 a that is joined to the opening edge of the opening 18 . A portion is formed thinner than the general portion 26 in a state before being joined to the duct wall portion 10a. The porous body 20 of the embodiment is formed thinner than the general portion 26 from the outer peripheral joint portion 24a to the adjacent portion 28 before being joined to the duct wall portion 10a. In addition, in the porous body 20 of the example, all of the adjoining portions 28 adjacent to the outer peripheral joint portions 24a corresponding to the opening edges of the four sides are in a state before being joined to the duct wall portion 10a. thinly formed.

図5(a)に示すように、多孔質体20は、桟部22に接合される桟部接合部分24bに対して該開口部18の開口領域18a側に隣接する隣接部分28の少なくとも一部が、ダクト壁部10aに接合する前の状態において、一般部分26よりも薄く形成される。実施例の多孔質体20は、桟部接合部分24bから隣接部分28にかけて、ダクト壁部10aに接合する前の状態において、一般部分26よりも薄く形成されている。また、実施例の多孔質体20は、1条の桟部22に対応する桟部接合部分24bに隣接する隣接部分28の全てが、ダクト壁部10aに接合する前の状態において、一般部分26よりも薄く形成されている。 As shown in FIG. 5( a ), the porous body 20 is at least part of an adjacent portion 28 that is adjacent to the opening region 18 a side of the opening 18 with respect to the crosspiece joint portion 24 b that is joined to the crosspiece 22 . is formed thinner than the general portion 26 before being joined to the duct wall portion 10a. The porous body 20 of the embodiment is formed to be thinner than the general portion 26 from the crosspiece joint portion 24b to the adjacent portion 28 before being joined to the duct wall portion 10a. Further, in the porous body 20 of the embodiment, the general portion 26 formed thinner than

実施例に係るダクト10は、所定形状に形成した多孔質体20をセットした成形型30においてダクト壁部10aを成形するインサート成形によって、第1分体14が得られる(図5および図6参照)。そして、別途型成形することで得られた第2分体16と、第1分体14とを組み付けることで、ダクト10を得ることができる。 In the duct 10 according to the embodiment, the first divided body 14 is obtained by insert molding in which the duct wall portion 10a is formed in the mold 30 in which the porous body 20 formed in a predetermined shape is set (see FIGS. 5 and 6). ). Then, the duct 10 can be obtained by assembling the second split body 16 and the first split body 14 obtained by molding separately.

図5および図6に示すように、成形型30は、下型34と、この下型34と相対的に開閉可能に構成された上型32とから構成され、型閉じした際に、下型34と上型32との間にダクト壁部10a(第1分体14)の形状に合わせたキャビティ36が形成される。上型32には、開口部18の開口領域18aの形成位置に合わせて凹部38が設けられている。また、上型32には、開口部18の開口領域18aのうち、開口部18の開口縁に隣接する位置に対応して、下型34にセットされた多孔質体20を下型34との間で押さえ付けて圧縮可能な圧縮部40が設けられている。実施例では、圧縮部40が、開口部18の開口縁に対応する位置および桟部22に対応する位置に亘って設けられ、多孔質体20における接合部分24a,24bとなる位置も、圧縮部40によって下型34へ向けて押さえ付け可能に構成されている。下型34には、開口部18の開口領域18aに対応して、凸部42が設けられている。 As shown in FIGS. 5 and 6, the mold 30 is composed of a lower mold 34 and an upper mold 32 which can be opened and closed relative to the lower mold 34. When the mold is closed, the lower mold A cavity 36 matching the shape of the duct wall portion 10a (first split body 14) is formed between 34 and upper die 32. As shown in FIG. The upper die 32 is provided with a recess 38 corresponding to the formation position of the opening region 18 a of the opening 18 . In addition, in the upper mold 32, the porous body 20 set in the lower mold 34 is placed in the opening region 18a of the opening 18, corresponding to the position adjacent to the opening edge of the opening 18. A compressible portion 40 is provided which can be compressed between them. In the embodiment, the compression part 40 is provided over the position corresponding to the opening edge of the opening 18 and the position corresponding to the crosspiece 22, and the positions of the joint portions 24a and 24b in the porous body 20 are also the compression parts. It is configured to be able to be pressed against the lower die 34 by 40 . The lower die 34 is provided with a convex portion 42 corresponding to the opening region 18 a of the opening portion 18 .

図5および図6に示すように、成形型30は、型閉じした際に、圧縮部40と凸部42との間に、多孔質体20においてダクト壁部10aに接合させる接合部分24a,24bに隣接する隣接部分28を挟んで、隣接部分28を圧縮した状態で挟持可能に構成されている。成形型30は、凹部38と凸部42との間が、多孔質体20において開口部18の開口領域18aの中央部に対応する一般部分26の板厚よりも小さく設定されている。成形型30は、型閉じした際に、凹部38と凸部42との間に、多孔質体20の一般部分26を圧縮した状態で挟持可能に構成されている。ここで、成形型30は、圧縮部40と凸部42とによる多孔質体20の隣接部分28の圧縮度合いが、凹部38と凸部42とによる多孔質体20の一般部分26の圧縮度合いよりも大きく設定されている。 As shown in FIGS. 5 and 6, when the mold 30 is closed, joint portions 24a and 24b are provided between the compressed portion 40 and the convex portion 42 to be joined to the duct wall portion 10a in the porous body 20. The adjacent portion 28 can be clamped in a compressed state. The mold 30 has a thickness between the concave portion 38 and the convex portion 42 smaller than the plate thickness of the general portion 26 corresponding to the central portion of the opening region 18 a of the opening 18 in the porous body 20 . The molding die 30 is configured such that the general portion 26 of the porous body 20 can be held in a compressed state between the concave portion 38 and the convex portion 42 when the mold is closed. Here, in the mold 30, the degree of compression of the adjacent portion 28 of the porous body 20 by the compression portion 40 and the projection 42 is higher than the degree of compression of the general portion 26 of the porous body 20 by the recess 38 and the projection 42. is also set large.

前述した成形型30を用いたダクト10(第1分体14)の製造方法は以下の通りである。開口部18の開口領域18aの中央部に対応する一般部分26の板厚と同じ板厚で形成された板状の多孔質体20を用意する。図5(a)に示すように、多孔質体20におけるダクト壁部10aに接合させる接合部分24a,24bに隣接する隣接部分28の少なくとも一部を、その板厚が、一般部分26の板厚よりも薄くなるように形成する。実施例では、多孔質体20における成形型30で挟持される隣接部分28の全体を、一般部分26よりも薄くなるように切断加工している。多孔質体20は、ダクト壁部10aにおける開口部18の開口縁に接合される外周接合部分24aおよび外周接合部分24aに隣接する隣接部分28に対応するように、外周縁部が薄く形成される。また、多孔質体20は、ダクト壁部10aにおける桟部22に接合される桟部接合部分24bおよび桟部接合部分24bに隣接する隣接部分28に対応するように薄く形成される。多孔質体20は、接合部分24a,24bから隣接部分28にかけて、一般部分26の板厚よりも薄くなるように形成される。多孔質体20は、接合部分24a,24bから隣接部分28側に向かうにつれて板厚が厚くなるように形成されており、接合部分24a,24bから隣接部分28にかけてダクト壁部10aと反対側が傾斜面となっている。ここで、多孔質体20には、該多孔質体20におけるダクト壁部10aと反対側を、一般部分26よりも凹むように形成して、一般部分26より薄い隣接部分28を設けている。 A method of manufacturing the duct 10 (first split body 14) using the mold 30 described above is as follows. A plate-like porous body 20 having the same plate thickness as that of the general portion 26 corresponding to the central portion of the opening region 18a of the opening 18 is prepared. As shown in FIG. 5( a ), at least a part of the adjacent portions 28 adjacent to the joint portions 24 a and 24 b of the porous body 20 to be joined to the duct wall portion 10 a has a thickness equal to that of the general portion 26 . formed to be thinner than In the embodiment, the entire adjoining portion 28 of the porous body 20 sandwiched between the molds 30 is cut so as to be thinner than the general portion 26 . The porous body 20 has a thin outer peripheral edge corresponding to an outer peripheral joint portion 24a joined to the opening edge of the opening 18 in the duct wall portion 10a and an adjacent portion 28 adjacent to the outer peripheral joint portion 24a. . In addition, the porous body 20 is formed thin so as to correspond to a crosspiece joint portion 24b joined to the crosspiece portion 22 of the duct wall portion 10a and an adjacent portion 28 adjacent to the crosspiece joint portion 24b. The porous body 20 is formed so as to be thinner than the plate thickness of the general portion 26 from the joint portions 24 a and 24 b to the adjacent portion 28 . The porous body 20 is formed so that the plate thickness increases from the joint portions 24a and 24b toward the adjacent portion 28, and the side opposite to the duct wall portion 10a from the joint portions 24a and 24b to the adjacent portion 28 is an inclined surface. It has become. Here, in the porous body 20, the side opposite to the duct wall portion 10a of the porous body 20 is formed so as to be recessed from the general portion 26, and an adjacent portion 28 thinner than the general portion 26 is provided.

一般部分26を凹部38に対応させると共に隣接部分28を圧縮部40に対応させて、多孔質体20を下型34に配置する。成形型30を型閉じすることで、隣接部分28を上型32の圧縮部40と下型34の凸部42との間に板厚方向に挟んで、隣接部分28を圧縮する(図5(b)参照)。このように、隣接部分28を成形型30で板厚方向に挟んで圧縮すると共に接合部分24a,24bをキャビティ36に臨ませた状態で、多孔質体20を成形型30に収める。この際、圧縮された隣接部分28が、一般部分26や接合部分24a,24bと比べて高密度になっている。 With the general portion 26 corresponding to the recess 38 and the adjacent portion 28 corresponding to the compression portion 40 , the porous body 20 is placed in the lower mold 34 . By closing the mold 30, the adjacent portion 28 is sandwiched in the plate thickness direction between the compression portion 40 of the upper mold 32 and the convex portion 42 of the lower mold 34 to compress the adjacent portion 28 (Fig. 5 ( b)). In this manner, the adjoining portion 28 is sandwiched between the mold 30 and compressed in the plate thickness direction, and the porous body 20 is placed in the mold 30 with the joint portions 24 a and 24 b facing the cavity 36 . At this time, the compressed adjacent portion 28 has a higher density than the general portion 26 and the joint portions 24a and 24b.

接合部分24a,24bが臨む成形型30のキャビティ36に、溶融状態にある合成樹脂Rを、圧力をかけながら供給する。そして、圧縮された隣接部分28によって合成樹脂Rを封止しつつ、キャビティ36において開口部18を有するダクト壁部10aを成形する(図6(a)参照)。ここで、多孔質体20においてキャビティ36に臨むように配置された接合部分24a,24bが、溶融して高温である合成樹脂Rに接触することで溶融する。このとき、溶融した合成樹脂Rが接合部分24a,24bから多孔質体20に含浸しようとするが、接合部分24a,24bに隣接する隣接部分28が圧縮されて高密度になっているので、合成樹脂Rが隣接部分28を越えて含浸することを防止することができる。溶融した合成樹脂Rを冷却・固化することで、ダクト壁部10aが成形され、多孔質体20の接合部分24aとダクト壁部10aとが接合し、多孔質体20が開口部18の開口領域18aを塞いだ状態でダクト壁部10aに一体的に固定される。 A molten synthetic resin R is supplied under pressure into the cavity 36 of the mold 30 facing the joint portions 24a and 24b. Then, the duct wall portion 10a having the opening 18 in the cavity 36 is formed while sealing the synthetic resin R with the compressed adjacent portion 28 (see FIG. 6(a)). Here, the joint portions 24a and 24b of the porous body 20, which are arranged so as to face the cavity 36, are melted by coming into contact with the synthetic resin R which is at a high temperature. At this time, the molten synthetic resin R attempts to impregnate the porous body 20 from the joint portions 24a and 24b, but since the adjacent portions 28 adjacent to the joint portions 24a and 24b are compressed and have a high density, synthetic Impregnation of the resin R beyond the adjacent portion 28 can be prevented. By cooling and solidifying the melted synthetic resin R, the duct wall portion 10a is molded, the joint portion 24a of the porous body 20 and the duct wall portion 10a are joined, and the porous body 20 forms the opening area of the opening portion 18. It is integrally fixed to the duct wall portion 10a in a state of closing the duct 18a.

成形型30を型開きして、多孔質体20が一体化された第1分体14を取り出す(図6(b)参照)。多孔質体20は、成形型30で圧縮されていた隣接部分28および一般部分26が自身の弾性により復元する。一方、多孔質体20は、接合部分24a,24bがダクト壁部10aと一体化して、元(接合前)の板厚よりも薄くなる。 The mold 30 is opened to take out the first split body 14 integrated with the porous body 20 (see FIG. 6(b)). In the porous body 20, the adjacent portion 28 and the general portion 26 compressed by the molding die 30 are restored by their own elasticity. On the other hand, the joint portions 24a and 24b of the porous body 20 are integrated with the duct wall portion 10a, and the thickness of the porous body 20 becomes thinner than the original thickness (before joining).

ダクト10は、インサート成形により多孔質体20とダクト壁部10aとを一体化する際に、多孔質体20におけるダクト壁部10aとの接合部分24a,24bに隣接する隣接部分28を圧縮して合成樹脂Rの含浸を封止している。従って、多孔質体20の隣接部分28を予め薄く形成しておくと、隣接部分28が圧縮状態から復元するときの変化量を小さくすることができる。このように、圧縮した隣接部分28が復元するときの変化量を小さくすることで、隣接部分28が復元時にダクト壁部10a側へ膨らんでしまうことを抑えることができる。従って、得られるダクト10は、開口部18を塞ぐようにダクト壁部10aの外面に接合された多孔質体20が、開口部18から空気流通路12に入り込んでしまうことを回避できる。そして、ダクト10は、開口部18が多孔質体20で塞がれた部位においても空気流通路12の断面積を適切に確保でき、空気を円滑に流通させることができる。 In the duct 10, when the porous body 20 and the duct wall portion 10a are integrated by insert molding, adjacent portions 28 of the porous body 20 adjacent to the joint portions 24a and 24b with the duct wall portion 10a are compressed. The impregnation of the synthetic resin R is sealed. Therefore, if the adjacent portion 28 of the porous body 20 is formed thin in advance, the amount of change when the adjacent portion 28 is restored from the compressed state can be reduced. In this way, by reducing the amount of change when the compressed adjacent portion 28 is restored, it is possible to prevent the adjacent portion 28 from swelling toward the duct wall portion 10a during restoration. Therefore, the obtained duct 10 can prevent the porous body 20 joined to the outer surface of the duct wall portion 10 a so as to block the opening 18 from entering the air flow passage 12 from the opening 18 . The duct 10 can appropriately secure the cross-sectional area of the air flow passage 12 even at the portion where the opening 18 is closed with the porous body 20, and the air can flow smoothly.

多孔質体20は、開口部18の開口縁に接合させる外周接合部分24aに隣接する隣接部分28だけでなく、開口部18に架け渡して形成される桟部22に接合させる桟部接合部分24bに隣接する隣接部分28についても、ダクト壁部10aに接合する前の状態において一般部分26よりも薄く形成されている。このようにすることで、多孔質体20の復元がダクト壁部10a(空気流通路12)側へ向かわないように制御することができる。従って、ダクト10は、開口部18が多孔質体20で塞がれた部位においても空気流通路12の断面積を適切に確保でき、空気を円滑に流通させることができる。 The porous body 20 includes not only the adjacent portion 28 adjacent to the outer peripheral joint portion 24a joined to the opening edge of the opening 18, but also the crosspiece joint portion 24b joined to the crosspiece 22 formed across the opening 18. The adjacent portion 28 adjacent to the duct wall portion 10a is also formed thinner than the general portion 26 in a state before being joined to the duct wall portion 10a. By doing so, it is possible to control the restoration of the porous body 20 so as not to move toward the duct wall portion 10a (air flow passage 12). Therefore, the duct 10 can appropriately secure the cross-sectional area of the air flow passage 12 even at the portion where the opening 18 is blocked by the porous body 20, and the air can flow smoothly.

多孔質体20は、ダクト壁部10aに接合する前の状態において、ダクト壁部10aと反対側を一般部分26よりも凹むように形成して、一般部分26よりも薄い隣接部分28を設けている。ダクト壁部10aに接合した多孔質体20は、一般部分26が接合部分24a,24bよりもダクト壁部10aと反対側へ張り出すように形成される。このようにすることで、多孔質体20の復元がダクト壁部10a(空気流通路12)側へ向かわないように制御することができる。従って、ダクト10は、開口部18が多孔質体20で塞がれた部位においても空気流通路12の断面積を適切に確保でき、空気を円滑に流通させることができる。 Before being joined to the duct wall portion 10a, the porous body 20 is formed such that the side opposite to the duct wall portion 10a is recessed more than the general portion 26, and an adjacent portion 28 thinner than the general portion 26 is provided. there is The porous body 20 joined to the duct wall portion 10a is formed such that the general portion 26 protrudes from the joining portions 24a and 24b to the side opposite to the duct wall portion 10a. By doing so, it is possible to control the restoration of the porous body 20 so as not to move toward the duct wall portion 10a (air flow passage 12). Therefore, the duct 10 can appropriately secure the cross-sectional area of the air flow passage 12 even at the portion where the opening 18 is blocked by the porous body 20, and the air can flow smoothly.

多孔質体20は、ダクト壁部10aに接合する前の状態において、接合部分24a,24bおよび隣接部分28の両方を一般部分26よりも薄くする構成であると、隣接部分28の薄肉化加工を行い易い。特に、図5(a)に示すように、接合部分24a,24bから隣接部分28に向かうにつれて板厚が増す構成であると、多孔質体20の薄肉化加工を行い易い。 If the porous body 20 is configured such that both the joint portions 24a and 24b and the adjacent portion 28 are thinner than the general portion 26 before being joined to the duct wall portion 10a, the adjacent portion 28 is thinned. Easy to do. In particular, as shown in FIG. 5(a), when the plate thickness increases from the joint portions 24a and 24b toward the adjacent portion 28, the porous body 20 can be easily thinned.

(変更例)
前述した構成に限らず、例えば、以下のように変更してもよい。
(Change example)
The configuration is not limited to that described above, and may be modified as follows, for example.

(1)実施例では、多孔質体の外周縁部を斜めにカットすることで、外周接合部分に対応する隣接部分を薄肉化し、多孔質体をV字状にカットすることで、桟部接合部分に対応する隣接部分を薄肉化したが、これに限らない。例えば、図7(a)に示すように、多孔質体20をダクト壁部10a側の面に沿って切り欠いたように形成することで、接合部分24a,24bおよび隣接部分28を薄肉化する構成であってもよい。なお、図7の変更例では、接合部分24a,24bおよび隣接部分28を、多孔質体20におけるダクト壁部10a側となる面に沿って切り欠いたように形成している。 (1) In the embodiment, by cutting the outer peripheral edge of the porous body obliquely, the adjacent portion corresponding to the outer peripheral joint portion is thinned, and by cutting the porous body in a V shape, the crosspiece is joined. Although the adjacent portion corresponding to the portion is thinned, the present invention is not limited to this. For example, as shown in FIG. 7A, the joint portions 24a and 24b and the adjacent portion 28 are thinned by forming the porous body 20 as if it were notched along the surface on the side of the duct wall portion 10a. It may be a configuration. In the modified example of FIG. 7, the joint portions 24a and 24b and the adjacent portion 28 are formed so as to be cut along the surface of the porous body 20 on the side of the duct wall portion 10a.

(2)実施例では、多孔質体においてダクト壁部に接合される接合部分に隣接する隣接部分全体を薄肉化したが、これに限らず、多孔質体の一縁部だけを薄肉化する、あるいは桟部接合部分に隣接する隣接部分を薄肉化しないなど、隣接部分の一部だけを薄肉化してもよい。
(3)実施例では、複数の分体を組み合わせてダクトを構成したが、これに限らず、成形型においてダクト全体を一度に成形してもよい。
(4)本発明は、バッテリを冷却する空気を案内する冷却ダクトや、エンジン等に空気を案内する吸気ダクトなど、様々なダクトに適用可能である。
(5)実施例では、多孔質体の接合部分および隣接部分の薄肉化を切断により行ったが、プレス成形によって多孔質体の接合部分および隣接部分を薄肉化してもよい。
(6)実施例では、上下型開きの成形型を使用したが、左右に型開きする成形型を用いてもよい。
(2) In the embodiment, the entire adjoining portion adjacent to the joint portion joined to the duct wall portion in the porous body is thinned, but not limited to this, only one edge of the porous body is thinned. Alternatively, only a portion of the adjacent portion may be thinned, such as not thinning the adjacent portion adjacent to the crosspiece joint portion.
(3) In the embodiment, the duct is constructed by combining a plurality of split bodies, but the duct is not limited to this, and the entire duct may be molded at once in the mold.
(4) The present invention can be applied to various ducts such as a cooling duct that guides air for cooling a battery and an intake duct that guides air to an engine or the like.
(5) In the examples, the joining portion and the adjacent portion of the porous body were thinned by cutting, but the joining portion and the adjacent portion of the porous body may be thinned by press molding.
(6) In the embodiment, a mold that opens vertically is used, but a mold that opens horizontally may also be used.

10 ダクト,10a ダクト壁部,12 空気流通路,18 開口部,
18a 開口領域,20 多孔質体,22 桟部,24a 外周接合部分(接合部分),
24b 桟部接合部分(接合部分),26 一般部分,28 隣接部分,30 成形型,
36 キャビティ,R 合成樹脂
10 duct, 10a duct wall, 12 air circulation passage, 18 opening,
18a opening region, 20 porous body, 22 crosspiece, 24a outer peripheral joint portion (joint portion),
24b crosspiece joint portion (joint portion), 26 general portion, 28 adjacent portion, 30 mold,
36 cavity, R synthetic resin

Claims (5)

ダクトであって、
空気流通路を画成する合成樹脂成形品であるダクト壁部と、
弾性を有し、前記ダクト壁部を貫通するように形成された開口部を塞ぐように該ダクト壁部に接合された多孔質体と、を備え、
前記ダクト壁部は、前記開口部に架け渡すように形成された桟部を備え、
前記多孔質体は、前記開口部の開口縁に接合した接合部分に対して該開口部の開口領域側に隣接する隣接部分の少なくとも一部が、該開口部の開口領域中央部に対応する一般部分よりも薄く形成され
前記多孔質体は、前記桟部に接合した接合部分に対して該開口部の開口領域側に隣接する隣接部分の少なくとも一部が、前記一般部分よりも薄く形成され、
前記多孔質体は、前記一般部分が前記接合部分よりも前記ダクト壁部と反対側へ張り出すように形成されている
ことを特徴とするダクト。
a duct,
a duct wall portion, which is a synthetic resin molded product that defines an air flow passage;
a porous body having elasticity and joined to the duct wall so as to block an opening formed to penetrate the duct wall;
the duct wall includes a crosspiece formed to span the opening,
In the porous body, at least a part of an adjacent portion adjacent to the opening region side of the opening with respect to the joint portion joined to the opening edge of the opening generally corresponds to the opening region central portion of the opening. formed thinner than the part ,
At least a portion of the porous body adjacent to the joint portion joined to the crosspiece on the opening region side of the opening is formed thinner than the general portion,
The porous body is formed such that the general portion protrudes from the joint portion to the side opposite to the duct wall portion.
A duct characterized by:
ダクトにおいて空気流通路を画成する合成樹脂成形品であるダクト壁部を貫通する開口部を塞ぐことに用いられ、弾性を有する発泡体であって、
前記ダクト壁部は、前記開口部に架け渡すように形成された桟部が備えられており、
前記発泡体は、
前記発泡体の外縁部に設けられ、前記開口部の開口縁に接合される部位となる外周接合部分と、
前記発泡体の外縁部間に設けられ、前記桟部に接合される部位となる桟部接合部分と、
前記外周接合部分及び前記桟部接合部分の内側に設けられ、前記開口部の開口領域を覆う部位となる一般部分と、
前記外周接合部分及び前記一般部分の間に設けられ、前記開口部の開口領域を覆う部位となる外周隣接部分と、
前記桟部接合部分及び前記一般部分の間に設けられ、前記開口部の開口領域を覆う部位となる桟部隣接部分と、を備え、
前記外周隣接部分及び前記桟部隣接部分の板厚が、前記一般部分よりも薄く形成されている
ことを特徴とするダクト用の発泡体。
An elastic foam that is used to close an opening penetrating a duct wall that is a synthetic resin molding that defines an air flow passage in the duct,
The duct wall portion is provided with a crosspiece formed to bridge the opening,
The foam is
An outer peripheral joint portion provided on the outer edge of the foam and serving as a portion to be joined to the opening edge of the opening;
A crosspiece joint portion provided between outer edges of the foam and serving as a portion to be joined to the crosspiece;
a general portion that is provided inside the outer peripheral joint portion and the crosspiece joint portion and serves as a portion that covers the opening area of the opening;
an outer peripheral adjacent portion that is provided between the outer peripheral joint portion and the general portion and serves as a portion that covers the opening region of the opening;
a crosspiece adjacent portion that is provided between the crosspiece joint portion and the general portion and serves as a portion that covers the opening area of the opening;
A foamed body for a duct, wherein the plate thickness of the portion adjacent to the outer circumference and the portion adjacent to the crosspiece is formed thinner than the thickness of the general portion.
弾性を有する多孔質体の一部を、型開きした成形型のキャビティに配置した状態で、前記成形型に前記多孔質体を収め、
前記成形型を型閉じすることで、前記多孔質体において前記キャビティに配置された一部に隣接する隣接部分を前記成形型で圧縮し、
前記キャビティに、溶融状態にある合成樹脂を供給し、圧縮された前記隣接部分によって前記合成樹脂を封止しつつ前記キャビティにおいて開口部を有するダクト壁部を成形することで、前記ダクト壁部に貫通形成される開口部を塞いで前記多孔質体を前記ダクト壁部に接合するダクトの製造方法であって、
前記多孔質体を前記成形型に配置する前に、前記隣接部分における少なくとも一部の板厚を、前記多孔質体における前記開口部の開口領域中央部に対応する一般部分よりも薄く形成する
ことを特徴とするダクトの製造方法
placing the porous body in the mold with a part of the porous body having elasticity being placed in the cavity of the opened mold;
By closing the mold, an adjacent portion of the porous body adjacent to the portion arranged in the cavity is compressed with the mold,
A synthetic resin in a molten state is supplied to the cavity, and a duct wall portion having an opening in the cavity is formed while the synthetic resin is sealed by the compressed adjacent portion. A method for manufacturing a duct in which an opening formed through the duct is closed and the porous body is joined to the duct wall,
Before placing the porous body in the mold, at least a portion of the adjacent portion is made thinner than a general portion corresponding to the central portion of the opening region of the opening in the porous body.
A method of manufacturing a duct characterized by :
弾性を有する多孔質体の一部を、型開きした成形型のキャビティに配置した状態で、前記成形型に前記多孔質体を収め、
前記成形型を型閉じすることで、前記多孔質体において前記キャビティに配置された一部に隣接する隣接部分を前記成形型で圧縮し、
前記キャビティに、溶融状態にある合成樹脂を供給し、圧縮された前記隣接部分によって前記合成樹脂を封止しつつ前記キャビティにおいて開口部を有するダクト壁部を成形することで、前記ダクト壁部に貫通形成される開口部を塞いで前記多孔質体を前記ダクト壁部に接合するダクトの製造方法であって、
前記多孔質体における前記ダクト壁部側となる面と反対側を、前記多孔質体における前記開口部の開口領域中央部に対応する一般部分よりも凹むように形成して、前記一般部分よりも薄い前記隣接部分を設ける
ことを特徴とするダクトの製造方法。
placing the porous body in the mold with a part of the porous body having elasticity being placed in the cavity of the opened mold;
By closing the mold, an adjacent portion of the porous body adjacent to the portion arranged in the cavity is compressed with the mold,
supplying synthetic resin in a molten state to the cavity , and forming a duct wall portion having an opening in the cavity while sealing the synthetic resin by the compressed adjacent portion; A method of manufacturing a duct, wherein an opening penetrating through the duct wall is closed and the porous body is joined to the duct wall,
The side opposite to the duct wall side of the porous body is formed so as to be recessed from a general portion corresponding to the central portion of the opening region of the opening of the porous body, and is more recessed than the general portion. providing the thin adjacent portion
A method of manufacturing a duct characterized by:
弾性を有する多孔質体の一部を、型開きした成形型のキャビティに配置した状態で、前記成形型に前記多孔質体を収め、
前記成形型を型閉じすることで、前記多孔質体において前記キャビティに配置された一部に隣接する隣接部分を前記成形型で圧縮し、
前記キャビティに、溶融状態にある合成樹脂を供給し、圧縮された前記隣接部分によって前記合成樹脂を封止しつつ前記キャビティにおいて開口部を有するダクト壁部を成形することで、前記ダクト壁部に貫通形成される開口部を塞いで前記多孔質体を前記ダクト壁部に接合するダクトの製造方法であって、
前記多孔質体における前記ダクト壁部に接合されることになる接合部分から前記隣接部分にかけて、前記多孔質体における前記開口部の開口領域中央部に対応する一般部分の板厚よりも薄く形成する
ことを特徴とするダクトの製造方法。
placing the porous body in the mold with a part of the porous body having elasticity being placed in the cavity of the opened mold;
By closing the mold, an adjacent portion of the porous body adjacent to the portion arranged in the cavity is compressed with the mold,
A synthetic resin in a molten state is supplied to the cavity, and a duct wall portion having an opening in the cavity is formed while the synthetic resin is sealed by the compressed adjacent portion. A method for manufacturing a duct in which an opening formed through the duct is closed and the porous body is joined to the duct wall,
From the joining portion to be joined to the duct wall portion of the porous body to the adjacent portion, the plate thickness of the general portion corresponding to the central portion of the opening region of the opening of the porous body is formed to be thinner than the thickness of the general portion .
A method of manufacturing a duct characterized by :
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002106431A (en) 2000-09-29 2002-04-10 Toyoda Gosei Co Ltd Air intake duct and its manufacturing method
JP2003080556A (en) 2001-09-13 2003-03-19 Inoac Corp Method for molding resin molding with foamed resin sheet
JP2004285895A (en) 2003-03-20 2004-10-14 Toyoda Gosei Co Ltd Intake device
JP2011012581A (en) 2009-06-30 2011-01-20 Inoac Corp Intake duct
WO2011155437A1 (en) 2010-06-08 2011-12-15 株式会社イノアックコーポレーション Intake duct
JP2020101146A (en) 2018-12-25 2020-07-02 トヨタ紡織株式会社 Air intake duct of internal combustion engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002106431A (en) 2000-09-29 2002-04-10 Toyoda Gosei Co Ltd Air intake duct and its manufacturing method
JP2003080556A (en) 2001-09-13 2003-03-19 Inoac Corp Method for molding resin molding with foamed resin sheet
JP2004285895A (en) 2003-03-20 2004-10-14 Toyoda Gosei Co Ltd Intake device
JP2011012581A (en) 2009-06-30 2011-01-20 Inoac Corp Intake duct
WO2011155437A1 (en) 2010-06-08 2011-12-15 株式会社イノアックコーポレーション Intake duct
JP2020101146A (en) 2018-12-25 2020-07-02 トヨタ紡織株式会社 Air intake duct of internal combustion engine

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