JP2005337097A - Sound-insulation cover - Google Patents

Sound-insulation cover Download PDF

Info

Publication number
JP2005337097A
JP2005337097A JP2004156378A JP2004156378A JP2005337097A JP 2005337097 A JP2005337097 A JP 2005337097A JP 2004156378 A JP2004156378 A JP 2004156378A JP 2004156378 A JP2004156378 A JP 2004156378A JP 2005337097 A JP2005337097 A JP 2005337097A
Authority
JP
Japan
Prior art keywords
sound
noise source
absorbing member
noise
soundproof cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2004156378A
Other languages
Japanese (ja)
Inventor
Masaaki Hirano
正明 平野
Masaaki Hamada
真彰 濱田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sumitomo Riko Co Ltd
Original Assignee
Sumitomo Riko Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Riko Co Ltd filed Critical Sumitomo Riko Co Ltd
Priority to JP2004156378A priority Critical patent/JP2005337097A/en
Publication of JP2005337097A publication Critical patent/JP2005337097A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Vehicle Interior And Exterior Ornaments, Soundproofing, And Insulation (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To suppress transmission of vibration to a sound-shielding member through a sound-absorption member while preventing leakage of noise by maintaining sealing property by the sound-absorption member to a high degree. <P>SOLUTION: The sound-absorption member 2 has an annular projection 21 abutted on a noise source 100 and comprising a polymer foaming body having a cell structure and has a deformation space to which the projection deformed when it is pressed toward the noise source is intruded. Since reaction force from the noise source 100 is absorbed, compression deformation of the projection 21 is extremely less and variation of a spring constant is less. Thereby, vibration can be suppressed from being transmitted to the sound-shielding member 1 through the sound-absorption member 2 and generation of secondary noise is suppressed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、エンジンなどから発生する騒音の漏洩を防止する防音カバーに関する。   The present invention relates to a soundproof cover that prevents leakage of noise generated from an engine or the like.

近年の自動車では、エンジンからの騒音を遮蔽するために防音カバーが配設されている。この防音カバーは、例えば特開平10−205352号公報に見られるように、樹脂又は鋼板よりなる硬質板状の遮音部材と、遮音部材のエンジン側表面に積層された発泡ウレタンなどの高分子発泡体よりなる吸音部材とから構成されている。この防音カバーでは、遮音部材がエンジンからの音を遮蔽しかつ外観意匠性を高めている。そして吸音部材がエンジンからの音を吸音し、音波が遮音部材まで到達して遮音部材を振動させるのが防止されている。またこの防音カバーは、ゴムマウントなどの防振部材を介してエンジン又はエンジン近傍に固定され、これによってエンジンの振動が遮音部材に伝達されるのを防止している。   In recent automobiles, a soundproof cover is provided to shield noise from the engine. As shown in, for example, Japanese Patent Laid-Open No. 10-205352, this soundproof cover is made of a hard plate-like sound insulation member made of resin or steel plate, and a polymer foam such as urethane foam laminated on the engine side surface of the sound insulation member. And a sound absorbing member. In this soundproof cover, the sound insulation member shields the sound from the engine and enhances the appearance design. The sound absorbing member absorbs the sound from the engine, and the sound wave is prevented from reaching the sound insulating member and vibrating the sound insulating member. The soundproof cover is fixed to the engine or the vicinity of the engine via a vibration isolation member such as a rubber mount, thereby preventing the vibration of the engine from being transmitted to the sound insulation member.

高分子発泡体として広く用いられている発泡ウレタンは、独立気泡率が数％程度と低く大部分が連続気泡であるために、吸音特性にはきわめて優れているものの、遮音特性が低い。そのため発泡ウレタン内部を伝わって騒音が漏洩するという問題がある。一方、独立気泡率を高めると、吸音特性が低下し防音カバー本来の防音効果が得られない。   Urethane foam widely used as a polymer foam has a low closed cell ratio of about several percent, and is mostly open-celled, so that it has excellent sound absorption characteristics but low sound insulation characteristics. Therefore, there is a problem that noise is transmitted through the inside of urethane foam. On the other hand, if the closed cell ratio is increased, the sound absorption characteristics are lowered and the original soundproof effect of the soundproof cover cannot be obtained.

そこで従来は、例えば特開平08−270889号公報などに記載されているように、大部分が連続気泡である発泡ウレタンを吸音部材として用い、それを騒音源に押圧して圧縮した状態で取付けることが行われている。これにより吸音部材が騒音源に弾接するので、シール性が高まり吸音部材と騒音源の間からの騒音の漏洩を防止することができる。また発泡ウレタンを圧縮することでセルが潰れるように変形するため音波の伝達が阻止され、吸音部材内部を伝わって騒音が漏洩するのを抑制することができる。そして、この防音カバーは、一般にゴム製のグロメットあるいはゴムマウントを介して騒音源に固定される。これにより騒音源の振動が硬質の遮音部材に伝達されるのを防止し、遮音部材が振動することによる二次騒音の発生を抑制している。   Therefore, conventionally, for example, as described in Japanese Patent Application Laid-Open No. 08-270889, etc., foamed urethane, which is mostly open-celled, is used as a sound absorbing member, and is attached in a compressed state by pressing it against a noise source. Has been done. As a result, the sound absorbing member is elastically contacted with the noise source, so that the sealing performance is improved and leakage of noise from between the sound absorbing member and the noise source can be prevented. Moreover, since the cell is deformed so as to be crushed by compressing the urethane foam, it is possible to prevent the transmission of sound waves and to prevent noise from leaking through the inside of the sound absorbing member. The soundproof cover is generally fixed to a noise source via a rubber grommet or a rubber mount. Thereby, the vibration of the noise source is prevented from being transmitted to the hard sound insulating member, and the generation of secondary noise due to the vibration of the sound insulating member is suppressed.

ところが発泡ウレタンからなる吸音部材を圧縮した状態で騒音源に固定すると、吸音部材における圧縮部分のバネ定数が大きく変化して固くなり、騒音源の振動が吸音部材を介して遮音部材に伝達され易くなるという不具合が生じる場合があることが明らかとなった。また防音カバーにおいては、寸法誤差を吸収して確実にシールするために、吸音部材の圧縮代を余分に形成する必要があり、圧縮量が大きくなって振動が益々伝達されやすくなるという問題もある。一方、吸音部材を圧縮しないで防音カバーを固定した場合には、シール性が低下して騒音源と吸音部材との間からの騒音の漏洩が問題となる。
特開平10−205352号 特開平08−270889号 However, when the sound absorbing member made of urethane foam is compressed and fixed to the noise source, the spring constant of the compression portion of the sound absorbing member changes greatly and becomes hard, and the vibration of the noise source is easily transmitted to the sound insulating member via the sound absorbing member. It became clear that there might be a problem of becoming. Further, in the soundproof cover, in order to absorb the dimensional error and securely seal it, it is necessary to form an extra compression allowance of the sound absorbing member, and there is a problem that the amount of compression increases and vibration is more easily transmitted. . On the other hand, when the soundproof cover is fixed without compressing the sound absorbing member, the sealing performance is lowered, and leakage of noise from between the noise source and the sound absorbing member becomes a problem.
JP-A-10-205352 JP 08-270889

本発明は上記した事情に鑑みてなされたものであり、吸音部材によるシール性を高く維持して騒音の漏洩を防止しつつ、吸音部材を介しての遮音部材への振動の伝達を抑制することを解決すべき課題とする。   The present invention has been made in view of the above circumstances, and suppresses vibration transmission to the sound insulation member through the sound absorbing member while maintaining high sealing performance by the sound absorbing member to prevent noise leakage. Is a problem to be solved.

上記課題を解決する本発明の防音カバーの特徴は、硬質板状の遮音部材と、遮音部材の表面に配設された吸音部材と、からなり吸音部材が騒音源に対向するように配置される防音カバーであって、吸音部材は騒音源に当接しセル構造の高分子発泡体からなる環状の凸部を有し、騒音源に向かって押圧された時に変形した凸部が入り込む変形空間を有することにある。   The soundproof cover of the present invention that solves the above-described problems is characterized by comprising a hard plate-like sound insulation member and a sound absorption member disposed on the surface of the sound insulation member so that the sound absorption member faces the noise source. A soundproof cover, wherein the sound absorbing member has an annular convex portion made of a polymer foam having a cell structure in contact with a noise source, and has a deformation space into which the convex portion deformed when pressed toward the noise source. There is.

本発明の防音カバーによれば、防音カバーを騒音源に向かって押圧した状態で取付けた時に、押圧された凸部は変形して変形空間に逃げる。したがって吸音部材のバネ定数の変化が僅かであり、吸音部材を介しての振動の伝達が大幅に抑制されるため、遮音部材の振動が抑制され二次騒音の発生が抑制される。そして凸部の変形によって潰れるように変形するセルが存在するため、騒音源と吸音部材との間からの騒音の漏洩を確実に防止することができシール性も確保される。また吸音部材を変形させる力が僅かでよいので、圧縮しながら組付ける従来の防音カバーに比べて組付けやすいという効果も得られる。   According to the soundproof cover of the present invention, when the soundproof cover is attached while being pressed toward the noise source, the pressed convex portion is deformed and escapes to the deformation space. Therefore, the change in the spring constant of the sound absorbing member is slight and the transmission of vibration through the sound absorbing member is greatly suppressed, so that the vibration of the sound insulating member is suppressed and the generation of secondary noise is suppressed. And since the cell which deform | transforms so that it may be crushed by deformation | transformation of a convex part exists, the leakage of the noise from between a noise source and a sound absorption member can be prevented reliably, and sealing performance is also ensured. Further, since the force for deforming the sound absorbing member may be small, an effect that it is easier to assemble than the conventional soundproof cover that is assembled while being compressed can be obtained.

本発明の防音カバ−では、吸音部材は騒音源に当接しセル構造の高分子発泡体からなる環状の凸部を有し、騒音源に向かって押圧された時に変形した凸部が入り込む変形空間を有している。したがって吸音部材が騒音源に向かって押圧されると、凸部が変形して変形空間に入り込むことで騒音源からの反力が吸収されるため、凸部の圧縮変形はきわめて僅かとなりバネ定数の変化が小さい。これにより吸音部材を介しての振動の伝達を抑制することができ、遮音部材の振動が抑制され二次騒音の発生が抑制される。   In the soundproof cover of the present invention, the sound absorbing member has an annular convex portion made of a polymer foam having a cell structure in contact with the noise source, and the deformed space into which the convex portion deformed when pressed toward the noise source enters. have. Therefore, when the sound absorbing member is pressed toward the noise source, the convex portion is deformed and enters the deformation space, so that the reaction force from the noise source is absorbed. Small change. Thereby, transmission of vibration through the sound absorbing member can be suppressed, vibration of the sound insulating member is suppressed, and generation of secondary noise is suppressed.

ところで、連続気泡が大部分の高分子発泡体によるシール性の発現は、高分子発泡体内のセルが潰れるように変形し、その部分で空気の通り道が塞がれることで音波が遮蔽されることに起因している。したがって、空気の通り道に存在するセルが１個でも潰れるように変形すればシール性が発現されるので、空気の通り道に存在するセル全てを潰す必要はない。   By the way, the expression of the sealing property by the polymer foam with the majority of the open cells is deformed so that the cells in the polymer foam are crushed, and the sound path is blocked by blocking the passage of air at that part. Due to Accordingly, if one cell existing in the air passage is deformed so as to be crushed, a sealing property is exhibited. Therefore, it is not necessary to crush all the cells existing in the air passage.

すなわち本発明の防音カバーでは、凸部の変形により、凸部あるいは吸音部材本体の一部には圧縮応力が作用し、一部には引っ張り応力が同時に作用している。また生じた圧縮応力及び引っ張り応力は大きさに分布をもち、その中間部分では剪断応力が作用している。したがって圧縮応力の大きい部位ではセルが圧縮されて潰れるように変形し、引っ張り応力の大きい部位ではセルが引っ張られて潰れるように変形し、剪断応力が作用している部位ではセルの変位量が大きいためセルはきわめて潰れやすい。したがって凸部の圧縮変形がきわめて僅かであっても、潰れるように変形したセルによって音波が遮蔽されシール性が発現される。   That is, in the soundproof cover of the present invention, due to the deformation of the convex portion, a compressive stress acts on the convex portion or a part of the sound absorbing member main body, and a tensile stress acts on a part of the convex portion or the sound absorbing member body. Further, the generated compressive stress and tensile stress have a distribution in magnitude, and a shear stress acts on an intermediate portion thereof. Therefore, the cell is deformed so that it is compressed and crushed at the part where the compressive stress is large, the cell is deformed so that it is pulled and crushed at the part where the tensile stress is large, and the amount of displacement of the cell is large at the part where the shear stress is applied. Therefore, the cell is very easy to collapse. Therefore, even if the convex deformation of the convex portion is very slight, the sound wave is shielded by the cell deformed so as to be crushed and a sealing property is exhibited.

遮音部材は、硬質樹脂、金属などから形成することができる。また吸音部材は、ポリウレタン、ポリオレフィン、発泡ゴムなどの高分子からなる発泡体あるいはフェルトやＰＥＴなどから形成することができるが、後述する環状凸部と同じ高分子からなる発泡体がコスト面や接合強度上好ましい。中でも連続気泡が大部分を占めるものが好適であり、発泡ウレタンが特に好ましい。   The sound insulation member can be formed from hard resin, metal, or the like. The sound-absorbing member can be formed of a foam made of a polymer such as polyurethane, polyolefin, and foamed rubber, or felt or PET. However, a foam made of the same polymer as the annular protrusion described later is cost-effective or bonded. It is preferable in terms of strength. Among them, those in which open cells occupy most are suitable, and urethane foam is particularly preferred.

吸音部材は、騒音源に当接する環状の凸部を有している。少なくともこの凸部はセル構造を有する高分子発泡体から形成され、変形によってシール性を発現する。この凸部は、連続気泡が大部分の高分子発泡体から形成してもよいし、凸部の騒音源に当接する表面のみをシール性に優れた独立気泡の発泡体から形成することもできる。   The sound absorbing member has an annular convex portion that comes into contact with the noise source. At least this convex part is formed from the polymer foam which has a cell structure, and expresses sealing performance by deformation | transformation. The convex portion may be formed from a polymer foam in which open cells are mostly formed, or only the surface of the convex portion that is in contact with the noise source can be formed from a closed-cell foam excellent in sealing properties. .

吸音部材は、騒音源に向かって押圧された時に変形した凸部が入り込む変形空間を有している。変形空間は、変形した凸部の一部が入り込む程度に小さく形成してもよいが、変形した凸部の全部が入り込む大きさ以上に大きく形成することが望ましい。この変形空間は、吸音部材の外部、吸音部材と遮音部材の間、あるいは吸音部材の内部に形成することができる。   The sound absorbing member has a deformation space into which a convex portion that is deformed when pressed toward the noise source enters. The deformation space may be formed small enough to allow a part of the deformed convex part to enter, but it is desirable to form the deformation space larger than the size into which the entire deformed convex part can enter. This deformation space can be formed outside the sound absorbing member, between the sound absorbing member and the sound insulating member, or inside the sound absorbing member.

吸音部材と遮音部材とは、互いに接合してもよいし接合せずに積層するだけでもよい。発泡ウレタンからなる吸音部材の場合には、遮音部材を発泡成形型内に配置した状態で吸音部材を発泡成形することで一体化することが好ましい。   The sound absorbing member and the sound insulating member may be joined to each other or simply laminated without joining. In the case of a sound absorbing member made of urethane foam, it is preferable to integrate the sound absorbing member by foam molding in a state where the sound insulating member is disposed in the foam molding die.

また本発明の防音カバーを騒音源に固定するための手段は、グロメットを介する手段、ゴムマウントを介する手段など、従来と同様でよい。   Further, the means for fixing the soundproof cover of the present invention to the noise source may be the same as conventional means such as a means via a grommet and a means via a rubber mount.

以下、実施例及び比較例により本発明を具体的に説明する。   Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples.

（実施例１）
図１及び図２に、本実施例の防音カバーを示す。この防音カバーは、金属製で板状の遮音部材１と、遮音部材１の表面に接合された発泡ウレタン製の吸音部材２と、からなり、図１に示すように吸音部材２がエンジン 100に対向するように配置される。エンジン 100にはボス 101が一体的に突出し、ゴム製のグロメット 102を介して遮音部材１がボルト 103でボス 101に固定されることで、吸音部材２の少なくとも周縁部がエンジン 100に当接した状態で保持されている。 (Example 1)
1 and 2 show a soundproof cover of this embodiment. This soundproof cover is composed of a metal plate-like sound insulation member 1 and a urethane foam sound absorption member 2 joined to the surface of the sound insulation member 1, and the sound absorption member 2 is attached to the engine 100 as shown in FIG. It arrange | positions so that it may oppose. A boss 101 projects integrally with the engine 100, and the sound insulating member 1 is fixed to the boss 101 with a bolt 103 via a rubber grommet 102, so that at least the peripheral portion of the sound absorbing member 2 abuts the engine 100. Held in a state.

本実施例の特徴をなす吸音部材２は、板状の本体20と、本体20の周縁部を一周する無端の環状に形成された断面Ｕ字形状の凸部21とから構成され、凸部21には側周面に一周するリング溝22が形成されている。また本体20には、表裏面を貫通しボス 101が挿入されるボス穴23が数カ所形成されている。この吸音部材２は、遮音部材１を発泡型内に配置した状態で、ウレタン樹脂から発泡成形により形成され、成形時に遮音部材１と一体的に接合されている。そして凸部21の厚さは、エンジン 100へ組付けられた状態における遮音部材１とエンジン 100表面との間隔より 1.5倍厚くなるように形成されている。   The sound absorbing member 2 that characterizes the present embodiment is composed of a plate-like main body 20 and a convex portion 21 having a U-shaped cross section that is formed in an endless ring around the peripheral edge of the main body 20. A ring groove 22 is formed around the side peripheral surface. The main body 20 is formed with several boss holes 23 through which the bosses 101 are inserted through the front and back surfaces. The sound absorbing member 2 is formed by foam molding from urethane resin in a state where the sound insulating member 1 is disposed in the foaming mold, and is integrally joined to the sound insulating member 1 at the time of molding. The thickness of the convex portion 21 is formed to be 1.5 times thicker than the distance between the sound insulating member 1 and the surface of the engine 100 when assembled to the engine 100.

吸音部材２は、連続気泡が大部分の発泡ウレタンから形成され、弾性を有している。したがって組付け時に凸部21がエンジン 100に当接して押圧されると、図２に示すように凸部21はリング溝22を狭めるように弾性変形する。これにより凸部21の先端が全周でエンジン 100に弾接しているので、騒音がエンジン 100と吸音部材２の本体20との間の空間から外部へ漏洩するのが防止され、高いシール性が発現される。   The sound-absorbing member 2 is formed of a large portion of urethane foam and has elasticity. Therefore, when the projection 21 is pressed against the engine 100 during assembly, the projection 21 is elastically deformed to narrow the ring groove 22 as shown in FIG. As a result, since the tip of the convex portion 21 is in elastic contact with the engine 100 all around, noise is prevented from leaking outside from the space between the engine 100 and the main body 20 of the sound absorbing member 2, and high sealing performance is achieved. Expressed.

また凸部21では、先端がリング溝22を狭めるように変形することでエンジン 100からの反力が吸収され、従来に比べて圧縮されにくいためバネ定数の変化も小さい。これにより凸部21を介しての振動の伝達を抑制することができ、遮音部材１の振動が抑制され二次騒音の発生が抑制される。   Further, the convex portion 21 is deformed so that the tip thereof narrows the ring groove 22, so that the reaction force from the engine 100 is absorbed, and the change in the spring constant is small because it is difficult to compress compared to the conventional case. As a result, the transmission of vibration through the convex portion 21 can be suppressed, the vibration of the sound insulating member 1 is suppressed, and the generation of secondary noise is suppressed.

さらに、リング溝22の底部には圧縮の力が作用し、その反対側の凸部21の内周表面には引っ張りの力が作用する。この剪断応力によって変位量がきわめて大きなセルが局部的に存在し、そのセルが潰れるように変形する。また圧縮の力が大きな部位又は引っ張りの力が大きな部位でも、潰れるように変形するセルが存在する。これらの潰れるように変形したセルによって音波の伝達が阻止されるので、連続気泡の多い吸音部材１であっても、騒音がエンジン 100と吸音部材２の本体20との間の空間から外部へ漏洩するのがさらに防止され、さらに高いシール性が発現される。   Further, a compression force acts on the bottom of the ring groove 22, and a tensile force acts on the inner peripheral surface of the convex portion 21 on the opposite side. Due to the shear stress, a cell having a very large displacement locally exists and deforms so that the cell is crushed. In addition, there is a cell that deforms so as to be crushed even in a site where the compression force is large or the tensile force is large. Since the sound waves are prevented from being transmitted by the cells deformed so as to be crushed, even in the sound absorbing member 1 having many open cells, noise leaks to the outside from the space between the engine 100 and the main body 20 of the sound absorbing member 2. This is further prevented and higher sealing performance is exhibited.

（実施例２〜５）
図３〜図６に本実施例の防音カバーの要部を示す。これらの防音カバーは、吸音部材２の凸部21の断面形状が異なること以外は実施例１と同様である。 (Examples 2 to 5)
The main part of the soundproof cover of a present Example is shown in FIGS. These soundproof covers are the same as those of the first embodiment except that the cross-sectional shape of the convex portion 21 of the sound absorbing member 2 is different.

図３に示す実施例２の防音カバーでは、吸音部材２の凸部21は外周側へ斜めに延出するリップ状に形成されている。したがって凸部21がエンジン 100に当接して押圧されると、凸部21は上方空間30に入り込むように弾性変形するので、凸部21の外周表面には圧縮の力が作用し、内周表面には引っ張りの力が作用する。またその中間に存在するセルには剪断応力が作用する。したがって実施例１と同様にエンジン 100からの反力が吸収されバネ定数の変化が小さいため、凸部21を介しての振動の伝達を抑制することができ、遮音部材１の振動が抑制され二次騒音の発生が抑制される。また潰れるように変形したセルによって音波の伝達が阻止されるので、連続気泡の多い吸音部材１であっても、騒音が外部へ漏洩するのがさらに防止され、高いシール性が発現される。   In the soundproof cover of Example 2 shown in FIG. 3, the convex portion 21 of the sound absorbing member 2 is formed in a lip shape extending obliquely toward the outer peripheral side. Therefore, when the convex portion 21 comes into contact with the engine 100 and is pressed, the convex portion 21 is elastically deformed so as to enter the upper space 30, so that a compression force acts on the outer peripheral surface of the convex portion 21, and the inner peripheral surface. A pulling force acts on. In addition, shear stress acts on the cells existing in the middle. Accordingly, the reaction force from the engine 100 is absorbed and the change in the spring constant is small as in the first embodiment, so that the transmission of vibration through the convex portion 21 can be suppressed, and the vibration of the sound insulating member 1 is suppressed. Generation of secondary noise is suppressed. Further, since the transmission of sound waves is prevented by the cells deformed so as to be crushed, even the sound absorbing member 1 having many open cells is further prevented from leaking noise to the outside, and high sealing performance is exhibited.

図４に示す実施例３の防音カバーでは、凸部21は外周側へ斜めに延出する第１リップ24と、内周側へ斜めに延出する第２リップ25と、からなる断面「人」字形状に形成されている。リップの先端から遮音部材１までの距離は、内周側の第２リップ25の方が外周側の第１リップ24より長い。この防音カバーでは、先ず第２リップ25がエンジン 100に当接して押圧されると、第２リップ25は本体20との間に形成された上方空間31に入り込むように弾性変形する。そしてさらに押圧されると、第１リップ24が上方空間30に入り込むように弾性変形する。したがって二段階でシール機能が発現されるため、騒音が外部へ漏洩するのがさらに防止され、また耐久性にも優れている。また押圧の力が分散されるため、バネ定数の変化がさらに小さくなり振動の伝達をさらに抑制することができる。   In the soundproof cover of Example 3 shown in FIG. 4, the convex portion 21 has a cross section “human” including a first lip 24 extending obliquely toward the outer peripheral side and a second lip 25 extending obliquely toward the inner peripheral side. It is formed in a letter shape. The distance from the tip of the lip to the sound insulation member 1 is longer on the inner peripheral second lip 25 than on the outer peripheral first lip 24. In this soundproof cover, when the second lip 25 is first pressed against the engine 100, the second lip 25 is elastically deformed so as to enter the upper space 31 formed between the main body 20 and the second lip 25. When further pressed, the first lip 24 is elastically deformed so as to enter the upper space 30. Therefore, since the sealing function is manifested in two stages, noise is further prevented from leaking to the outside, and the durability is also excellent. In addition, since the pressing force is dispersed, the change in the spring constant is further reduced, and vibration transmission can be further suppressed.

図５に示す実施例４の防音カバーでは、凸部21と遮音カバー１との間に上方空間32が形成されている。したがって凸部21がエンジン 100に当接して押圧されると、凸部21は上方空間32に入り込むように弾性変形するので、実施例１などと同様の作用効果が奏される。   In the soundproof cover of Example 4 shown in FIG. 5, an upper space 32 is formed between the convex portion 21 and the soundproof cover 1. Therefore, when the convex portion 21 comes into contact with the engine 100 and is pressed, the convex portion 21 is elastically deformed so as to enter the upper space 32, so that the same effects as those of the first embodiment and the like are exhibited.

図６に示す実施例５の防音カバーでは、凸部21の内部に環状の中空部33が形成され、凸部21の先端には中空部33に連通する環状のスリット34が形成されている。したがって凸部21がエンジン 100に当接して押圧されると、凸部21はスリット34の両側が中空部33に入り込むように弾性変形するので、実施例３と同様の作用効果が奏される。   In the soundproof cover of Example 5 shown in FIG. 6, an annular hollow portion 33 is formed inside the convex portion 21, and an annular slit 34 communicating with the hollow portion 33 is formed at the tip of the convex portion 21. Therefore, when the convex portion 21 is pressed against the engine 100, the convex portion 21 is elastically deformed so that both sides of the slit 34 enter the hollow portion 33, so that the same effect as the third embodiment is achieved.

本発明の防音カバーは、エンジンの他、吸気マニホールド、吸気ダクト、などの防音カバー、あるいはアンダーカバーなどとして用いることができる。   The soundproof cover of the present invention can be used as a soundproof cover such as an intake manifold and an intake duct, or an undercover, in addition to an engine.

本発明の一実施例の防音カバーを騒音源に組付けた状態で示す断面図である。It is sectional drawing shown in the state which assembled | attached the soundproof cover of one Example of this invention to the noise source. 本発明の一実施例の防音カバーの組付け前後の状態を示す要部断面図である。It is principal part sectional drawing which shows the state before and behind the assembly | attachment of the soundproof cover of one Example of this invention. 本発明の第２の実施例の防音カバーの要部断面図である。It is principal part sectional drawing of the soundproof cover of 2nd Example of this invention. 本発明の第３の実施例の防音カバーの要部断面図である。It is principal part sectional drawing of the soundproof cover of the 3rd Example of this invention. 本発明の第４の実施例の防音カバーの要部断面図である。It is principal part sectional drawing of the soundproof cover of the 4th Example of this invention. 本発明の第５の実施例の防音カバーの要部断面図である。It is principal part sectional drawing of the soundproof cover of the 5th Example of this invention.

符号の説明Explanation of symbols

１：遮音部材 ２：吸音部材 20：本体
21：凸部 22：リング溝（変形空間） 1: Sound insulation member 2: Sound absorption member 20: Body
21: Convex part 22: Ring groove (deformation space)

Claims (1)

硬質板状の遮音部材と、該遮音部材の表面に配設された吸音部材と、からなり該吸音部材が騒音源に対向するように配置される防音カバーであって、
該吸音部材は該騒音源に当接しセル構造の高分子発泡体からなる環状の凸部を有し、該騒音源に向かって押圧された時に変形した該凸部が入り込む変形空間を有することを特徴とする防音カバー。 A soundproof cover comprising a hard plate-like sound insulation member and a sound absorption member disposed on the surface of the sound insulation member, the sound absorption member being disposed so as to face the noise source,
The sound absorbing member has an annular convex part made of a polymer foam having a cell structure in contact with the noise source, and has a deformation space into which the convex part deformed when pressed toward the noise source. Soundproof cover featuring.
JP2004156378A 2004-05-26 2004-05-26 Sound-insulation cover Pending JP2005337097A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004156378A JP2005337097A (en) 2004-05-26 2004-05-26 Sound-insulation cover

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004156378A JP2005337097A (en) 2004-05-26 2004-05-26 Sound-insulation cover

Publications (1)

Publication Number Publication Date
JP2005337097A true JP2005337097A (en) 2005-12-08

Family

ID=35490944

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004156378A Pending JP2005337097A (en) 2004-05-26 2004-05-26 Sound-insulation cover

Country Status (1)

Country Link
JP (1) JP2005337097A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103375252A (en) * 2012-04-24 2013-10-30 株式会社神户制钢所 Mounting structure for sound shielding cover
CN104751838A (en) * 2013-12-27 2015-07-01 李新亮 Sound-proof and noise-reduced protective door
KR20220083357A (en) * 2020-12-11 2022-06-20 엔브이에이치코리아(주) Cover for high pressure fuel pump

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58165228U (en) * 1982-04-30 1983-11-02 いすゞ自動車株式会社 noise reduction device
JP2000220467A (en) * 1999-01-28 2000-08-08 Tokai Rubber Ind Ltd Low water absorptive and low oil absorptive sound insulating material

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58165228U (en) * 1982-04-30 1983-11-02 いすゞ自動車株式会社 noise reduction device
JP2000220467A (en) * 1999-01-28 2000-08-08 Tokai Rubber Ind Ltd Low water absorptive and low oil absorptive sound insulating material

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103375252A (en) * 2012-04-24 2013-10-30 株式会社神户制钢所 Mounting structure for sound shielding cover
CN104751838A (en) * 2013-12-27 2015-07-01 李新亮 Sound-proof and noise-reduced protective door
KR20220083357A (en) * 2020-12-11 2022-06-20 엔브이에이치코리아(주) Cover for high pressure fuel pump
KR102591333B1 (en) * 2020-12-11 2023-10-20 엔브이에이치코리아(주) Cover for high pressure fuel pump

Similar Documents

Publication Publication Date Title
JP5459835B2 (en) Soundproof cover for automobile
KR101544622B1 (en) Sound absorbing cover, method of manufacturing thereof and method of sound absorbing
JP4767209B2 (en) Soundproof cover
JP3833909B2 (en) Soundproof cover
JP2006257993A (en) Soundproof cover
US20080128200A1 (en) Double-Wall Structure
JP2006039379A (en) Sound insulating sheet
JP5002300B2 (en) Soundproof cover and its mounting structure
JP4745117B2 (en) TV with built-in hard disk
JP2008248809A5 (en)
KR100235678B1 (en) A material for absorbing noise in a car
JP2005337097A (en) Sound-insulation cover
JP2007156309A (en) Sound absorbing material
JP5654926B2 (en) Engine cover and engine soundproof structure
JP2007114617A (en) Sound absorbing cover
JP2000230431A (en) Soundproof cover
US20090117320A1 (en) Carpet for vehicle and method for manufacturing same
US7077450B2 (en) Sound-absorbing material for vehicle&#39;s lower portion
JP2001138771A (en) Soundproof member for dash panel
JP2006284658A (en) Sound absorbing and blocking structure
JP5592628B2 (en) Glass run
KR20090062024A (en) Engine cover having double layer material foam
JP3905350B2 (en) Production method of soundproof cover
JP6616970B2 (en) Sound absorbing material
CN210067714U (en) Door outside handle blotter, door and vehicle

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20060823

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070517

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20070522

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20070723

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20071025