JP3743578B2

JP3743578B2 - Soundproof cover and manufacturing method thereof

Info

Publication number: JP3743578B2
Application number: JP31095695A
Authority: JP
Inventors: 雅浩成田; 清隆中井
Original assignee: Aisin Seiki Co Ltd; Aisin Corp
Current assignee: Aisin Corp
Priority date: 1995-11-29
Filing date: 1995-11-29
Publication date: 2006-02-08
Anticipated expiration: 2015-11-29
Also published as: JPH09151788A

Description

【０００１】
【発明の属する技術分野】
本発明は、エンジン等の騒音を防ぐためにシリンダヘッド等に取り付けられるヘッドカバ−等の防音カバ−に関する。
【０００２】
【従来の技術】
自動車用のエンジンには、爆発音等の騒音が外部に漏れ出るのを少なくするためにそのシリンダヘッドとかオイルパンに防音カバーが取り付けられている。この防音カバーとして、例えば特開平３−８１１２４号公報には、取り付け用のフランジと騒音源を覆う天板とをもつエンジンカバーが開示されている。このエンジンカバーの天板の表皮部はフランジを形成するのと同じ硬質樹脂で形成され、天板の芯部は硬質樹脂より騒音逓減効果の優れた樹脂で形成されている。
【０００３】
【発明が解決しようとする課題】
上記従来の防音カバ−は、その芯の部分に騒音逓減効果の優れた樹脂を使用し、防音性を高めている。しかしながら、防音カバ−を構成する表皮部が硬質樹脂で形成されているため、騒音源に面した表皮部の振動が硬い表皮部を介して騒音源に背向する側の表皮部に伝達され、外側に面する表皮部より騒音が漏れ出るという問題がある。
【０００４】
本発明はかかる問題を解消することを課題とする。
【０００５】
【課題を解決するための手段】
上記課題を解決する本発明の防音カバーは、音源をカバーする容器状の本体部と該本体部の少なくとも一部周縁を形成するフランジ状固定部とからなる防音カバーにおいて、該本体部および該固定部の外側部を形成しガラス繊維により強化された熱可塑性樹脂よりなる硬質樹脂で形成された外側本体部と外側固定部とからなる外側部材と、該外側本体部と空隙を隔てて設けられ該本体部および該固定部の内側部を形成し非強化の熱可塑性樹脂又は熱可塑性エラストマーよりなる軟質樹脂で形成された内側本体部と内側固定部とからなる内側部材とを備え、前記外側固定部と前記内側固定部とが一体的に固定されてなることを特徴とする。
また、本発明の防音カバーの製造方法は、音源をカバーする容器状の本体部と該本体部の少なくとも一部周縁を形成するフランジ状固定部とからなる防音カバーの製造方法において、該本体部および該固定部の外側部を形成しガラス繊維により強化された熱可塑性樹脂よりなる硬質樹脂で形成された外側本体部と外側固定部とからなる外側部材と、該外側本体部と空隙を隔てて設けられ該本体部および該固定部の内側部を形成し非強化の熱可塑性樹脂又は熱可塑性エラストマーよりなる軟質樹脂で形成された内側本体部と内側固定部とからなる内側部材とを２色成形により成形し、前記内側部材の成形収縮に起因して前記空隙を形成するとともに、前記外側固定部と前記内側固定部とを一体的に固定することを特徴とする。
【０００６】
本願発明の防音カバーは、騒音源と対向する内側部材が軟質樹脂で形成されている。軟質樹脂は柔らかく騒音等の音の振動を伝えにくい性質がある。このため、騒音源の振動が内側部材から外側部材に伝達されにくく、それだけ外側部材は振動しない。すなわち、外側部材の振動が少なくなるため、外側部材から外部に漏れ出る騒音が少なくなる。また、本願発明の防音カバーは内側部材と外側部材との間に空隙が形成されている。そのため内側部材から外側部材に伝達される騒音振動をより一層少なくできる。
【０００７】
【発明の実施の形態】
この防音カバーを構成する外側部材と内側部材はそれぞれ別個に成形し、後で両者を一体的に固定したものとすることができる。固定方法としてはボルト等で機械的に固定する方法、熱溶着あるいは接着等で接合する方法等が採用できる。なお、個々に形成された外側部材と内側部材の少なくとも一方は、両者間に形成される空隙を維持するため、先端が他方の対向面に当接するリブをもつものとするのが好ましい。
【０００８】
また、内側部材および外側部材を２色成形で製造し、後から成形された部材の成形収縮により両者間に空隙を形成するものでもよい。なお、２色成形にあたり、外側部材および内側部材の分離を避けるためにフランジ状固定部を機械的に係止する構成とするのが望ましい。
また、内側部材を形成する軟質樹脂に代えてゴムを使用してもよい。
硬質樹脂と軟質樹脂あるいはゴムの柔らかさの程度は、少なくとも曲げ弾性率で１／２以下、より好ましくは１／１０以下がよい。具体的に硬質樹脂としては、ポリアミド樹脂、ポリエステル樹脂等の熱可塑性樹脂（ガラス繊維にて強化したもの）が採用できる。軟質樹脂としては、非強化の熱可塑性樹脂や熱可塑性エラストマーが採用できる。ゴムとしては通常の天然ゴム、合成ゴムが採用できる。
【０００９】
【発明の作用】
本発明の防音カバーでは、内側本体部と内側固定部からなる内側部材が、軟質樹脂といった柔らかい材料で形成されている。軟質樹脂は柔らかく騒音等の音の振動を伝えにくく、かつ振動を吸収する機能が優れている。このため、騒音源の振動が内側部材から外側部材に伝達されにくく、それだけ外側部材は振動しない。すなわち、外側部材の振動が少なくなるため、外側部材から外部に漏れ出る騒音が少なくなる。また、本願発明の防音カバーは内側部材と外側部材の間に空隙が形成されている。そのため内側部材から外側部材に伝達される騒音振動をより一層少なくできる。
【００１０】
【実施例】
以下、図面を参考にしながら実施例により本発明を具体的に説明する。
（実施例１）
実施例１の防音カバ−の全体斜視図を図１に、拡大要部断面を図２に示す。この防音カバ−はガラス繊維が４５重量％配合されたＰＡ６（東レ製ＣＭ１０１１Ｇ−４５）樹脂で成形された外側部材１とガラス繊維を含まないＰＡ６樹脂で成形された内側部材２とで構成されている。この外側部材１と内側部材２との間に空隙１１ａが形成されている。なお、外側部材１を形成するガラス繊維が４５重量％配合されたＰＡ６樹脂の曲げ弾性率は１２００ｋｇ／ｍｍ²であり、内側部材２を形成するガラス繊維を含まないＰＡ６樹脂の曲げ弾性率は２５５ｋｇ／ｍｍ²である。
【００１１】
外側部材１は防音カバ−の音源をカバ−する容器状の本体部の外側を構成する外側本体部１１と、この外側本体部１１の周縁に一体的に形成され防音カバ−のフランジ状固定部の外側を構成する外側固定部１２とからなる。外側固定部１２には周縁に沿って間隔を隔てて複数個の係止穴１２ａが形成されている。
内側部材２は、外側部材１の内側に空隙１１ａを隔てて入るように外側部材１より小さく形成された内側本体部２１とその周縁に形成された内側固定部２２とからなる。内側本体部２１の上面には長手方向に延びる２本のリブ２１１、２１１が形成されている。また、内側固定部２２には外側固定部１２の係止穴１２ａと同軸となった共穴（図示せず）が形成されている。
【００１２】
内側部材２は外側部材１の内側に装着されて使用される。この装着された状態で内側部材２の内側固定部２２の上に外側部材１の外側固定部１２が当接して重なる。そして内側部材２のリブ２１１、２１１の上端面が外側部材１の外側本体部１１の内面に当接する。この状態で外側固定部１２の係止穴１２ａと内側固定部２２の係止穴は共穴となる。
【００１３】
本実施例の防音カバ−は上記した構成を持つ。この防音カバ−は内側部材２の内側本体部２１によりエンジンカバー（図示せず）を覆うように係止穴１２ａを通して、シリンダブロック（図示せず）のネジ穴にボルト（図示せず）を介して固定される。エンジンカバーより発する騒音は柔らかい内側部材２で先ず阻止される。そして一部騒音が内側部材２を振動させる。そしてこの内側部材２の振動（騒音）はリブ２１１、２１１および空隙１１ａを介して外側部材１に伝達される。空隙１１ａを占める空気中での音の伝達は弱いため、そしてリブ２１１、２１１が柔らかい材料で形成されているため外側部材１に伝達される振動は弱いものとなる。このため外側部材１から発振する騒音も弱いものとなる。
【００１４】
また、シリンダブロックに固定され、シリンダブロックと直接接するフランジ状固定部の内側固定部２２は柔らかい材料で形成されている。このため硬い材料で形成された外側固定部１２には柔らかい材料で形成された内側固定部２２を通して振動が伝達されるため、伝達される振動が弱くなり、それだけ外側部材から発振される騒音は少なくなる。
【００１５】
（実施例２）
実施例２の防音カバ−の拡大要部断面を図３に示す。この防音カバ−はＰＡ６（東レ製ＣＭ１０１１Ｇ−４５）樹脂で成形された外側部材３とこの外側部材３の内側にＰＡ６（東レ製ＣＭ１００７）樹脂で２色成形された内側部材４とで構成されている。そしてこの外側部材３と内側部材４との間に内側部材４の成形後の冷却時の成形収縮に起因する空隙３１ａが形成されている。なお、外側部材３を形成する樹脂の曲げ弾性率は１２００ｋｇ／ｍｍ²であり、内側部材４を形成する樹脂の曲げ弾性率は２５５ｋｇ／ｍｍ²である。
【００１６】
外側部材３は防音カバ−の音源をカバ−する容器状の本体部の外側を構成する外側本体部３１と、この外側本体部３１の周縁に一体的に形成され防音カバ−のフランジ状固定部の外側を構成する外側固定部３２とからなる。外側固定部３２には周縁に沿って間隔を隔てて複数個の係止穴３２ａが形成されている。なお、係止穴３２ａの下方を形成する筒状部３３が外側固定部３２の下面より突出している。
【００１７】
内側部材４は、外側部材３の内側に狭い空隙３１ａを隔てて装着された内側本体部４１とその周縁に形成された内側固定部４２とからなる。内側固定部４２には外側固定部３２の係止穴３２ａの下方を形成する筒状部３３を外側から覆う構造となっている。そして外側固定部３２の熱収縮により、外側固定部３２の筒状部３３を強く締めつけ、外側部材３と内側部材４とが固く一体化されている。
【００１８】
本実施例２の防音カバ−も実施例１の防音カバーと同じ優れた防音効果を持つ。特に本実施例２の防音カバ−は内側部材４が２色成形により形成されるため外側部材３と内側部材４との組付けを必要としない。このため製造が単純化される。また、外側固定部３２の筒状部３３がカラーとしての機能を持つため、ボルト等で固定されたときに被る圧縮に対して強い抵抗を示し、ボルトが緩む等の不都合を回避できる。
【００１９】
【発明の効果】
本発明の防音カバ−は、硬質樹脂で作られた外側部材と、該硬質樹脂に比べ、柔らかい軟質樹脂で作られた内側部材から構成され、防音効果および頑丈性が著しく向上している。
【図面の簡単な説明】
【図１】本発明の実施例１の全体斜視図である。
【図２】本発明の実施例１の要部拡大断面図である。
【図３】本発明の実施例２の要部拡大断面図である。
【符号の説明】
１、３─外側部材２、４─内側部材１１、３１─外側本体部
１２、３２─外側固定部２１、４１─内側本体部
２２、４２─内側固定部１１ａ、３１ａ─空隙
１２ａ、３２ａ─係止穴３３─筒状部２１１─リブ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a soundproof cover such as a head cover attached to a cylinder head or the like in order to prevent noise of an engine or the like.
[0002]
[Prior art]
The engine for automobiles is provided with a soundproof cover on its cylinder head or oil pan in order to reduce leakage of noise such as explosion sound to the outside. As this soundproof cover, for example, JP-A-3-81124 discloses an engine cover having a mounting flange and a top plate covering a noise source. The skin portion of the top plate of the engine cover is formed of the same hard resin as that forming the flange, and the core portion of the top plate is formed of a resin having a better noise reduction effect than the hard resin.
[0003]
[Problems to be solved by the invention]
The conventional soundproofing cover uses a resin having an excellent noise reduction effect at the core portion to improve soundproofing. However, since the skin part constituting the soundproof cover is made of hard resin, the vibration of the skin part facing the noise source is transmitted to the skin part on the side facing the noise source through the hard skin part, There is a problem that noise leaks from the outer skin part.
[0004]
It is an object of the present invention to solve this problem.
[0005]
[Means for Solving the Problems]
Soundproof cover of the present invention to solve the above problems is the container-like main body portion and at least a portion soundproof cover peripheral ing a flange-like fixing portion forming a body portion for covering a sound source, body portion and said An outer member composed of an outer main body portion and an outer fixing portion formed of a hard resin made of a thermoplastic resin that forms the outer portion of the fixing portion and is reinforced with glass fibers, and is provided with a gap therebetween. and a inner member comprising a body portion and said inner body portion which inner portion is formed is formed from consisting of soft resins thermoplastic resins or thermoplastic elastomers unreinforced fixed part and the inner-side fixing portion, wherein The outer fixing part and the inner fixing part are integrally fixed .
The soundproof cover manufacturing method of the present invention includes a container-shaped main body portion that covers a sound source and a flange-shaped fixing portion that forms at least a peripheral edge of the main body portion. And an outer member formed of a hard resin made of a thermoplastic resin reinforced with glass fibers that forms the outer portion of the fixing portion, and an outer member made of an outer fixing portion, with the outer body portion spaced apart from the gap Two-color molding of an inner member comprising an inner main body portion and an inner fixing portion which is formed of a soft resin made of a non-reinforced thermoplastic resin or thermoplastic elastomer, which is provided and forms the inner portion of the main body portion and the fixing portion. The gap is formed due to molding shrinkage of the inner member, and the outer fixing portion and the inner fixing portion are integrally fixed.
[0006]
Soundproof cover of the present invention, the inner member facing the noise source is formed of a soft resins. Soft resins, it is difficult to nature that convey the vibration of the sound of soft noise like. For this reason, the vibration of the noise source is hardly transmitted from the inner member to the outer member, and the outer member does not vibrate that much. That is, since the vibration of the outer member is reduced, noise leaking from the outer member to the outside is reduced. In the soundproof cover of the present invention, a gap is formed between the inner member and the outer member. Therefore, noise vibration transmitted from the inner member to the outer member can be further reduced.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The outer member and the inner member constituting the soundproof cover can be formed separately, and can be integrally fixed later. As a fixing method, a method of mechanically fixing with a bolt or the like, a method of joining by heat welding or adhesion, or the like can be employed. Note that at least one of the individually formed outer member and inner member preferably has a rib whose tip abuts against the other facing surface in order to maintain a gap formed therebetween.
[0008]
Further, the inner member and the outer member may be manufactured by two-color molding, and a gap may be formed between them by molding shrinkage of a member molded later. Note that when two-color molding, to a structure to mechanically lock the flange-like fixing portion in order to avoid separation of the outer side member and the inner member is desirable.
Further, rubber may be used in place of the soft resin forming the inner member.
The degree of softness of the hard resin and soft resin or rubber is at least 1/2 or less, more preferably 1/10 or less in terms of flexural modulus. Specifically, a thermoplastic resin such as a polyamide resin or a polyester resin (reinforced with glass fiber) can be used as the hard resin. As the soft resin, an unreinforced thermoplastic resin or a thermoplastic elastomer can be used. Usable natural rubber or synthetic rubber can be used as the rubber.
[0009]
[Effects of the Invention]
The soundproof cover of the present invention, the inner member made of the inner body portion and the inner fixed portions are formed of a soft material having said that soft resins. Soft resins is difficult to convey the vibration of the sound of soft noise, etc., and the ability to absorb the vibration is excellent. For this reason, the vibration of the noise source is hardly transmitted from the inner member to the outer member, and the outer member does not vibrate that much. That is, since the vibration of the outer member is reduced, noise leaking from the outer member to the outside is reduced. In the soundproof cover of the present invention, a gap is formed between the inner member and the outer member. Therefore, noise vibration transmitted from the inner member to the outer member can be further reduced.
[0010]
【Example】
Hereinafter, the present invention will be described in detail with reference to the drawings.
(Example 1)
FIG. 1 shows an overall perspective view of the soundproof cover of Example 1, and FIG. This soundproof cover is composed of an outer member 1 formed of PA6 (Toray CM1011G-45) resin containing 45% by weight of glass fiber and an inner member 2 formed of PA6 resin not containing glass fiber. Yes. A gap 11 a is formed between the outer member 1 and the inner member 2. The flexural modulus of PA6 resin containing 45% by weight of glass fiber forming outer member 1 is 1200 kg / mm ² , and the flexural modulus of PA6 resin not including glass fiber forming inner member 2 is 255 kg. / Mm ² .
[0011]
The outer member 1 includes an outer main body 11 constituting the outer side of a container-like main body that covers the sound source of the soundproof cover, and a flange-shaped fixing portion of the soundproof cover that is integrally formed on the periphery of the outer main body 11. And an outer fixing portion 12 that constitutes the outer side. A plurality of locking holes 12a are formed in the outer fixing portion 12 at intervals along the periphery.
The inner member 2 includes an inner main body portion 21 formed smaller than the outer member 1 so as to enter the outer member 1 with a gap 11a therebetween, and an inner fixing portion 22 formed on the periphery thereof. Two ribs 211 and 211 extending in the longitudinal direction are formed on the upper surface of the inner main body portion 21. The inner fixing portion 22 is formed with a common hole (not shown) that is coaxial with the locking hole 12 a of the outer fixing portion 12.
[0012]
The inner member 2 is used by being mounted inside the outer member 1. In this mounted state, the outer fixing portion 12 of the outer member 1 contacts and overlaps the inner fixing portion 22 of the inner member 2. The upper end surfaces of the ribs 211 and 211 of the inner member 2 are in contact with the inner surface of the outer main body 11 of the outer member 1. In this state, the locking holes 12a of the outer fixing portion 12 and the locking holes of the inner fixing portion 22 are common holes.
[0013]
The soundproof cover of this embodiment has the above-described configuration. This soundproof cover passes through a locking hole 12a so as to cover an engine cover (not shown) by the inner body portion 21 of the inner member 2, and a bolt (not shown) is inserted into a screw hole of a cylinder block (not shown). Fixed. Noise generated from the engine cover is first blocked by the soft inner member 2. And some noises vibrate the inner member 2. The vibration (noise) of the inner member 2 is transmitted to the outer member 1 through the ribs 211 and 211 and the gap 11a. Since the transmission of sound in the air occupying the gap 11a is weak, and the ribs 211 and 211 are made of a soft material, the vibration transmitted to the outer member 1 is weak. For this reason, the noise oscillated from the outer member 1 is also weak.
[0014]
Moreover, the inner side fixing | fixed part 22 of the flange-shaped fixing | fixed part fixed to a cylinder block and in direct contact with a cylinder block is formed with the soft material. For this reason, since vibration is transmitted to the outer fixing portion 12 formed of a hard material through the inner fixing portion 22 formed of a soft material, the transmitted vibration is weakened, and the noise generated from the outer member is reduced accordingly. Become.
[0015]
(Example 2)
FIG. 3 shows an enlarged cross section of the essential part of the soundproof cover of the second embodiment. This soundproof cover is composed of an outer member 3 molded with PA6 (Toray CM1011G-45) resin and an inner member 4 molded in two colors with PA6 (Toray CM1007) resin inside the outer member 3. Yes. A gap 31a is formed between the outer member 3 and the inner member 4 due to molding shrinkage during cooling after the inner member 4 is molded. The bending elastic modulus of the resin forming the outer member 3 is 1200 kg / mm ² , and the bending elastic modulus of the resin forming the inner member 4 is 255 kg / mm ² .
[0016]
The outer member 3 includes an outer main body 31 constituting the outer side of a container-like main body that covers the sound source of the soundproof cover, and a flange-shaped fixing portion of the soundproof cover that is integrally formed on the periphery of the outer main body 31. And an outer fixing portion 32 that constitutes the outer side. A plurality of locking holes 32a are formed in the outer fixing portion 32 at intervals along the periphery. A cylindrical portion 33 that forms the lower side of the locking hole 32 a protrudes from the lower surface of the outer fixing portion 32.
[0017]
The inner member 4 includes an inner main body portion 41 mounted on the inner side of the outer member 3 with a narrow gap 31a therebetween, and an inner fixing portion 42 formed on the periphery thereof. The inner fixing portion 42 has a structure that covers the cylindrical portion 33 that forms the lower portion of the locking hole 32a of the outer fixing portion 32 from the outside. Then, due to the heat shrinkage of the outer fixing portion 32, the tubular portion 33 of the outer fixing portion 32 is strongly tightened, and the outer member 3 and the inner member 4 are firmly integrated.
[0018]
The soundproof cover of the second embodiment also has the same excellent soundproofing effect as the soundproof cover of the first embodiment. In particular, the soundproof cover of the second embodiment does not require assembly of the outer member 3 and the inner member 4 because the inner member 4 is formed by two-color molding. This simplifies manufacturing. In addition, since the cylindrical portion 33 of the outer fixing portion 32 has a function as a collar, it shows a strong resistance to compression when it is fixed with a bolt or the like, and inconveniences such as loosening of the bolt can be avoided.
[0019]
【The invention's effect】
The soundproof cover of the present invention is composed of an outer member made of a hard resin and an inner member made of a soft soft resin as compared with the hard resin, and the soundproofing effect and the robustness are remarkably improved.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of Embodiment 1 of the present invention.
FIG. 2 is an enlarged cross-sectional view of a main part of Embodiment 1 of the present invention.
FIG. 3 is an enlarged cross-sectional view of a main part of Embodiment 2 of the present invention.
[Explanation of symbols]
1, 3—Outer member 2, 4—Inner member 11, 31—Outer body part 12, 32—Outer fixing part 21, 41—Inner body part 22, 42—Inner fixing part 11a, 31a—Gap 12a, 32a— Blind hole 33—Tubular part 211—Rib

Claims

音源をカバーする容器状の本体部と該本体部の少なくとも一部周縁を形成するフランジ状固定部とからなる防音カバーにおいて、該本体部および該固定部の外側部を形成しガラス繊維により強化された熱可塑性樹脂よりなる硬質樹脂で形成された外側本体部と外側固定部とからなる外側部材と、該外側本体部と空隙を隔てて設けられ該本体部および該固定部の内側部を形成し非強化の熱可塑性樹脂又は熱可塑性エラストマーよりなる軟質樹脂で形成された内側本体部と内側固定部とからなる内側部材とを備え、前記外側固定部と前記内側固定部とが一体的に固定されてなることを特徴とする防音カバー。 A container shaped body portion and at least a portion soundproof cover peripheral ing a flange-like fixing portion forming a body portion for covering a sound source, reinforced with glass fibers to form the outer portion of the body part and the fixing part An outer member composed of an outer main body portion and an outer fixing portion formed of a hard resin made of a thermoplastic resin, and an inner portion of the main body portion and the fixing portion provided to be spaced from the outer main body portion. and comprising an inner member comprising a thermoplastic resin or thermoplastic elastomer from the consisting soft resins inner body portion formed in the inner-side fixing portion of the non-reinforced, integral with the outer fixed portion and the inner fixing part A soundproof cover, characterized by being fixed to .

該外側部材と該内側部材は別個に成形された後一体的に固定されたものである請求項１記載の防音カバー。The soundproof cover according to claim 1, wherein the outer member and the inner member are molded separately and then fixed integrally.

該外側部材および該内側部材は２色成形で製造され、該空隙は後から成形された部材の成形収縮により形成されたものである請求項１記載の防音カバー。The soundproof cover according to claim 1, wherein the outer member and the inner member are manufactured by two-color molding, and the gap is formed by molding shrinkage of a member molded later.

前記内側部材の曲げ弾性率は、前記外側部材の曲げ弾性率の１／２以下である請求項１乃至３のいずれか１項に記載の防音カバー。The soundproof cover according to any one of claims 1 to 3, wherein a bending elastic modulus of the inner member is not more than ½ of a bending elastic modulus of the outer member .

音源をカバーする容器状の本体部と該本体部の少なくとも一部周縁を形成するフランジ状固定部とからなる防音カバーの製造方法において、該本体部および該固定部の外側部を形成しガラス繊維により強化された熱可塑性樹脂よりなる硬質樹脂で形成された外側本体部と外側固定部とからなる外側部材と、該外側本体部と空隙を隔てて設けられ該本体部および該固定部の内側部を形成し非強化の熱可塑性樹脂又は熱可塑性エラストマーよりなる軟質樹脂で形成された内側本体部と内側固定部とからなる内側部材とを２色成形により成形し、前記内側部材の成形収縮に起因して前記空隙を形成するとともに、前記外側固定部と前記内側固定部とを一体的に固定することを特徴とする防音カバーの製造方法。In a method of manufacturing a soundproof cover comprising a container-like main body portion that covers a sound source and a flange-shaped fixing portion that forms at least a part of the periphery of the main body portion, a glass fiber is formed by forming the main body portion and the outer portion of the fixing portion. An outer member formed of a hard resin made of a thermoplastic resin reinforced by the outer member and an outer fixing member, and the outer member and the inner portion of the fixing member provided to be spaced from the outer main member. Due to molding shrinkage of the inner member, an inner member made of a non-reinforced thermoplastic resin or a soft resin made of a thermoplastic elastomer and an inner member made of an inner fixing portion is formed by two-color molding. Then, while forming the said space | gap, the said outer side fixing | fixed part and the said inner side fixing | fixed part are fixed integrally, The manufacturing method of the soundproof cover characterized by the above-mentioned.