JPH0660718U - Silencer - Google Patents
SilencerInfo
- Publication number
- JPH0660718U JPH0660718U JP224593U JP224593U JPH0660718U JP H0660718 U JPH0660718 U JP H0660718U JP 224593 U JP224593 U JP 224593U JP 224593 U JP224593 U JP 224593U JP H0660718 U JPH0660718 U JP H0660718U
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- Prior art keywords
- tubular portion
- resonance chamber
- noise
- silencer
- slit
- Prior art date
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Abstract
(57)【要約】
【目的】本考案は、ひとつの筒状部を効果的に活用する
簡素な構造で、広い周波数領域の騒音を低減できる消音
器を提供することを目的とする。
【構成】本考案の消音器は、一端20aが空気通路4に
開口する両端開口の筒状部2と、該筒状部2の他端20
bが開口し、該空気通路4の騒音を低減させるための共
鳴室30を形成する密閉容器3と、よりなる消音器1で
あって、前記筒状部2の前記他端20bをもつ他端部2
bは、前記共鳴室30内に突出しており、該他端部2b
は、該他端20bより軸方向に伸びる少なくとも1個の
スリット21をもつことを特徴とする。
(57) [Summary] [Object] An object of the present invention is to provide a silencer capable of reducing noise in a wide frequency range with a simple structure that effectively utilizes one tubular portion. A silencer according to the present invention comprises a tubular portion 2 having one end 20a which is open to an air passage 4 and which is open at both ends, and the other end 20 of the tubular portion 2.
A silencer 1 including an airtight container 3 having an opening b and forming a resonance chamber 30 for reducing noise in the air passage 4, the other end having the other end 20b of the tubular portion 2. Part 2
b protrudes into the resonance chamber 30, and the other end 2b
Has at least one slit 21 extending in the axial direction from the other end 20b.
Description
【0001】[0001]
本考案は、内燃機関の吸気系あるいは排気系の途中に設置されて使用され、通 過する気体に起因する騒音を低減させる消音器に関する。 The present invention relates to a silencer which is installed and used in the middle of an intake system or an exhaust system of an internal combustion engine and reduces noise caused by passing gas.
【0002】[0002]
内燃機関の吸気系あるいは排気系の途中に設置されて使用され、通過する気体 により発生する騒音を低減せしめる従来の消音器として例えば、実開昭59ー2 8665号公報に、共鳴減衰方式の騒音低減装置(説明上、図5に示す)が開示 されている。 As a conventional silencer which is installed and used in the middle of an intake system or an exhaust system of an internal combustion engine and reduces noise generated by passing gas, for example, a resonance damping type noise is disclosed in Japanese Utility Model Publication No. 59-28665. A reducer (for illustration, shown in FIG. 5) is disclosed.
【0003】 この騒音低減装置1cは、吸気管4cに接続する一端側開口20cおよび軸心 線と直交しない切断面に形成された他端側傾斜開口21cをもつ分岐管2cと、 分岐管2cの他端側傾斜開口21cを覆うように取り付けた密閉器3cと、より なる。This noise reduction device 1c includes a branch pipe 2c having one end side opening 20c connected to the intake pipe 4c and another end side inclined opening 21c formed in a cut surface not orthogonal to the axis, and a branch pipe 2c. The sealing device 3c is attached so as to cover the other end side inclined opening 21c.
【0004】[0004]
この騒音低減装置1cは、その使用時にそれぞれ吸気管4cより分岐管2cの 他端側傾斜開口21cの傾斜上端部c1 までの長さl1 と、傾斜下端部c2 まで の長さl2 との二通りの長さとして作用する。 そして騒音低減装置1cにおいて、吸気管4cより分岐管2cが長さl2 とし て作用するときの音波の共鳴周波数は、The noise reduction device 1c, the length l 1 to the inclined upper portion c 1 of the other end side inclined opening 21c of the branch pipe 2c from an intake pipe 4c to their use during the inclined lower end portion c of up to 2 length l 2 Acts as two different lengths. In the noise reduction device 1c, the resonance frequency of the sound wave when the branch pipe 2c acts as the length l 2 from the intake pipe 4c is
【0005】[0005]
【化1】 [Chemical 1]
【0006】 となるが、実際には分岐管2cの長さl1 の時の共鳴周波数、However, in reality, the resonance frequency when the length of the branch pipe 2c is l 1 ,
【0007】[0007]
【化2】 [Chemical 2]
【0008】 に強く影響を受けるため、前記共鳴周波数f2 の効果が低くなる。 すなわち、前記従来の騒音低減装置の場合、その共鳴周波数f2 は、共鳴周波 数f1 に影響を受けるため、図4に示される曲線bのように、減衰できる周波数 帯域が狭くなる。 本考案は、ひとつの筒状部を効果的に活用する簡素な構造で、広い周波数領域 の騒音を低減できる消音器を提供することを目的とする。The resonance frequency f 2 is less effective. That is, in the case of the conventional noise reduction device, the resonance frequency f 2 thereof is affected by the resonance frequency f 1 , so that the attenuable frequency band becomes narrow as shown by the curve b in FIG. An object of the present invention is to provide a silencer capable of reducing noise in a wide frequency range with a simple structure that effectively utilizes one tubular portion.
【0009】[0009]
本考案の消音器は、一端が気体通路に開口する両端開口の筒状部と、 該筒状部の他端が開口し、該気体通路の騒音を低減させるための共鳴室を形成 する密閉容器と、よりなる消音器であって、 前記筒状部の前記他端をもつ他端部は、前記共鳴室内に突出しており、該他端 部は、該他端より前記一端に向けて伸びる少なくとも1個のスリットをもつこと を特徴とする。 The silencer of the present invention is a closed container in which one end is open to a gas passage, and a tubular portion is open at both ends, and the other end of the tubular portion is opened to form a resonance chamber for reducing noise in the gas passage. And the other end of the tubular portion having the other end projects into the resonance chamber, and the other end extends at least from the other end toward the one end. It is characterized by having one slit.
【0010】[0010]
本考案の消音器は、内燃機関の吸気系あるいは排気系の気体通路の途中に設置 されて使用される。そして、気体通路を通過する気体に起因して発生する騒音の 音波を、密閉容器の共鳴室と、共鳴室内に突出しスリットをもつ筒状部とにより 、共鳴減衰して騒音を低減させるときの筒状部における実質的に有効な領域とし ては、気体通路より筒状部の他端までの長い領域と、気体通路より筒状部のスリ ット閉端までの短い領域とが得られる。そしてさらに前記有効な領域は、筒状部 のスリットの長さおよび巾、形状などを、目的に応じて設定することにより、種 々変化する。 The silencer of the present invention is installed and used in the middle of a gas passage of an intake system or an exhaust system of an internal combustion engine. Then, the sound wave of the noise generated due to the gas passing through the gas passage is resonantly attenuated by the resonance chamber of the closed container and the tubular portion having the slit protruding into the resonance chamber to reduce the noise. As the substantially effective region of the tubular portion, a region that is longer than the gas passage to the other end of the tubular portion and a region that is shorter than the gas passage to the slit closed end of the tubular portion can be obtained. Further, the effective area is variously changed by setting the length, width, shape and the like of the slit of the cylindrical portion according to the purpose.
【0011】 従って、本考案の消音器によれば、気体通路内の騒音が、筒状部より共鳴室に 伝播したとき、前記長い領域に適合した波長の騒音と、短い領域に適合した波長 の騒音と、長い領域より短い領域までの間の領域に適合した波長の騒音とを、筒 状部と共鳴室との相互作用により低減し、消音させ得る。Therefore, according to the muffler of the present invention, when the noise in the gas passage propagates from the tubular portion to the resonance chamber, the noise of the wavelength suitable for the long region and the noise of the wavelength suitable for the short region are separated. Noise and noise of a wavelength adapted to a region between a long region and a short region can be reduced and silenced by the interaction between the tubular portion and the resonance chamber.
【0012】[0012]
(実施例1) 図1〜3に基づいて本発明の実施例1の消音器1を、内燃機関の吸気管4の空 気通路40に連結し、空気通路40を通過する空気のもつ騒音を低減し、消音す る場合に適用して説明する。 (Embodiment 1) Based on FIGS. 1 to 3, the silencer 1 of Embodiment 1 of the present invention is connected to an air passage 40 of an intake pipe 4 of an internal combustion engine to reduce noise of air passing through the air passage 40. This is applied to the case of reducing and muting.
【0013】 図1に示されるように、実施例1の消音器1は、筒状部2と、筒状部2に一体 的に形成され共鳴室30を形成する密閉容器3と、よりなる。 筒状部2は、ポリプロピレン製のもので、一端側開口20aをもつ一端部2a と、密閉容器3の共鳴室30内に突出し、この共鳴室30に開口する他端側開口 20bおよび他端側開口20bより軸方向に沿って一端部2a側に向かって伸び る4個のスリット21をもつ他端部2bと、よりなる。なお、筒状部2はその内 部に、内径が36mmの連通通路20が形成されるとともに、その一端部2aが 吸気管4に垂直に形成され空気通路40に連通する取り付け部41の連通孔42 に連結されたとき、空気通路40より他端部2bに形成されたスリット21まで の長さl1 が62mmに設定され、また空気通路4より他端側開口20bまでの 長さl2 が124mmに設定される。前記スリット21は、長さl3 が62mm 、幅tが3mmに設定されている。As shown in FIG. 1, the muffler 1 according to the first embodiment includes a tubular portion 2 and a closed container 3 that is integrally formed with the tubular portion 2 and forms a resonance chamber 30. The tubular portion 2 is made of polypropylene and has one end 2a having one end side opening 20a and the other end side opening 20b protruding into the resonance chamber 30 of the closed container 3 and opening to the resonance chamber 30 and the other end side. The other end portion 2b has four slits 21 extending from the opening 20b toward the one end portion 2a side along the axial direction. A communication passage 20 having an inner diameter of 36 mm is formed inside the tubular portion 2, and one end portion 2 a of the attachment portion 41 is formed vertically to the intake pipe 4 and communicates with the air passage 40. When connected to 42, the length l 1 from the air passage 40 to the slit 21 formed at the other end 2b is set to 62 mm, and the length l 2 from the air passage 4 to the other end side opening 20b is set. It is set to 124 mm. The slit 21 has a length l 3 of 62 mm and a width t of 3 mm.
【0014】 密閉容器3も、ポリプロピレン製のもので、本体部3aと、本体部3aに連結 された蓋部3bとで、予め設定された容積の共鳴室30を形成する。 本体部3aは、前記筒状部2の外周面22に一体的に形成され、やや一端部2 a側の位置で半径方向に突出する平面壁部30aおよび平面壁部30aの縁部先 端より筒状部2の軸方向に沿って伸びる側壁部31aよりなる。この側壁部31 aの端部は、前記筒状部2の他端側開口20bより、筒状部2の軸方向他端側に 若干突出しており、またこの端部には側壁部31aの周方向外側に向かって延び るフランジ部32aが環状に突出形成されている。The closed container 3 is also made of polypropylene, and the main body portion 3a and the lid portion 3b connected to the main body portion 3a form a resonance chamber 30 having a preset volume. The main body portion 3a is formed integrally with the outer peripheral surface 22 of the tubular portion 2, and is formed at a position slightly closer to the one end portion 2a than the plane wall portion 30a and the edge portion of the plane wall portion 30a. It is composed of a sidewall portion 31a extending along the axial direction of the tubular portion 2. The end portion of the side wall portion 31a slightly protrudes from the other end side opening 20b of the tubular portion 2 toward the other end side in the axial direction of the tubular portion 2, and the end portion of the side wall portion 31a has a circumference. A flange portion 32a extending outward in the direction is formed in a ring shape.
【0015】 蓋部3bは、前記本体部3aの平面壁部30aの対向する蓋本体部30bと、 この蓋本体部30bの周縁より筒状部2の軸方向に沿って延びる蓋側部31bと よりなる。この蓋側部31bの先端には、周方向外側に向かって延びる環状のフ ランジ部32bが連続的に突出形成され、このフランジ部32bと前記フランジ 部32aとが当接接合されて密閉容器3内部の共鳴室30を形成している。The lid portion 3b includes a lid body portion 30b facing the plane wall portion 30a of the body portion 3a, and a lid side portion 31b extending from the peripheral edge of the lid body portion 30b along the axial direction of the tubular portion 2. Consists of. An annular flange portion 32b extending outward in the circumferential direction is continuously projected and formed at the tip of the lid side portion 31b, and the flange portion 32b and the flange portion 32a are abutted and joined to each other to form a closed container 3 The internal resonance chamber 30 is formed.
【0016】 前記のように構成された消音器1によれば、筒状部2における実質的に有効な 領域としては、空気通路40より筒状部2の他端側開口20bまでの長い領域l 2 と、空気通路40より筒状部2のスリット21の閉端までの短い領域l1 との 間の周波数に対応できる。 そして、空気通路40内の騒音が、筒状部2と共鳴室30とに伝播したとき、 前記長い領域l2 に適合した周波数の騒音と、短い領域l1 に適合した周波数の 騒音と、長い領域l2 より短い領域l1 までの間の領域に適合した周波数の騒音 とを、筒状部2と共鳴室3との相互作用により低減せしめる。According to the muffler 1 configured as described above, the substantially effective region of the tubular portion 2 is a long region 1 extending from the air passage 40 to the other end side opening 20b of the tubular portion 2. 2 And a short region 1 from the air passage 40 to the closed end of the slit 21 of the tubular portion 2.1It can handle frequencies between and. When the noise in the air passage 40 propagates to the tubular portion 2 and the resonance chamber 30, the long area l2Noise with a frequency suitable for1Noise with a frequency compatible with2Shorter area l1The noise of the frequency suitable for the region between the above and the above is reduced by the interaction between the tubular portion 2 and the resonance chamber 3.
【0017】 従って、実施例1の消音器1は、前記ひとつの筒状部2によって、共鳴室30 の容積を増すことなく、空気通路40より共鳴室30までの長さを2種類混成さ せた機能が発揮され、図3に示されるa曲線のように広い範囲の周波数を減衰で きる。 このため、消音器1は、小さなものであっても、複数の周波数を低減すること ができ、広範囲に消音効果が発揮できる。またその設置スペースが少なくて済む 。Therefore, in the muffler 1 of the first embodiment, the length of the air passage 40 to the resonance chamber 30 is mixed by the one tubular portion 2 without increasing the volume of the resonance chamber 30. This function is exhibited, and a wide range of frequencies can be attenuated as indicated by the curve a shown in FIG. Therefore, even if the muffler 1 is small, it is possible to reduce a plurality of frequencies, and a muffling effect can be exhibited in a wide range. Moreover, the installation space is small.
【0018】 なお、前記作用効果が得られる理由としては、 スリット21が十分に幅広い場合には、共鳴室30内に突出する他端部2bが 設置されていない場合に近づき、筒状部2は、一端部2aのみが空気通路40と 共鳴室30とを連通する連通路して働くため、一端部2aのみを設置したものと 同じとなり、下記の共鳴周波数を持つ。The reason why the above-described effects are obtained is that when the slit 21 is sufficiently wide, the other end 2b protruding into the resonance chamber 30 approaches when the other end 2b is not installed, and the tubular portion 2 is Since only the one end portion 2a works as a communication passage that connects the air passage 40 and the resonance chamber 30, it is the same as that in which only the one end portion 2a is installed, and has the following resonance frequency.
【0019】[0019]
【化3】 [Chemical 3]
【0020】 (但し、s:一端部2aの断面積 l1 :空気通路4より一端部2aのみを含め た長さ、le :l1 の補正長さ、V:密閉容器3の容積 c:音速とした。) また、スリット21の幅が十分に小さい場合には、他端部2bも一端部2aと ともに空気通路40と共鳴室3とを連通する連通路して働くため、一端部2a+ 他端部2bとなり、下記の共鳴周波数を持つ。(However, s: cross-sectional area of one end 2 a l 1 : length including only one end 2 a from the air passage 4, l e : corrected length of l 1 , V: volume of closed container c: When the width of the slit 21 is sufficiently small, the other end portion 2b works together with the one end portion 2a as a communication passage that connects the air passage 40 and the resonance chamber 3, so that the one end portion 2a + It becomes the other end 2b and has the following resonance frequency.
【0021】[0021]
【化4】 [Chemical 4]
【0022】 (但し、l2 :(空気通路40から他端部2bの他端までの長さ)。 このように実施例1の消音器1によれば、筒状部2の他端部2bに形成された スリット21の面積を広くすると共鳴周波数f1 に効果のあるレゾネータになり 、スリット21の面積を狭くすると共鳴周波数f2 に効果のあるレゾネータにな るため、目的に応じて共鳴周波数f1 〜f2 の範囲で、種々、使い分けることが できる。なお、この場合、前記スリット21の設定数を調整することができる。(However, l 2 : (length from the air passage 40 to the other end of the other end 2b). As described above, according to the muffler 1 of the first embodiment, the other end 2b of the tubular part 2 is provided. If the area of the slit 21 formed in the area is widened, it becomes a resonator effective for the resonance frequency f 1, and if the area of the slit 21 is narrowed, it becomes a resonator effective for the resonance frequency f 2. The slits 21 can be used in various ways within the range of f 1 to f 2. In this case, the number of slits 21 can be adjusted.
【0023】 (実施例2) 本考案の消音器の実施例2を図4に基づいて説明する。 図4に示す実施例2の消音器1Aは、実施例1の消音器1の筒状部2に形成し た一定幅のスリット21の代わりに、筒状部2の他端側開口20bに向かって抜 き勾配をもつスリット21Aを形成した以外は、実施例1の構成と同じである( 実施例1と同じ構成部分は、同じ符号で示す)。Second Embodiment A second embodiment of the silencer of the present invention will be described with reference to FIG. The muffler 1A of the second embodiment shown in FIG. 4 faces the opening 20b on the other end side of the tubular part 2 instead of the slit 21 having a constant width formed in the tubular part 2 of the muffler 1 of the first embodiment. The structure is the same as that of the first embodiment except that the slit 21A having a draft is formed (the same components as those of the first embodiment are denoted by the same reference numerals).
【0024】 実施例2の消音器1Aは、実施例1と同様、共鳴室30の容積を増すことなく 、図3に示されるa曲線のように広い範囲の周波数を減衰できる。 なお、前記実施例1および実施例2では、筒状部2に一定幅のスリット21お よび抜き勾配をもつスリット21Aを4個形成した場合を示したが、これに限定 されるものではなく、その形成数は1個以上とすることができ、またスリットの 形状は凹凸部を備えたものなど、種々の形状のものを用いることができる。Like the first embodiment, the muffler 1A of the second embodiment can attenuate a wide range of frequencies as shown by the curve a in FIG. 3 without increasing the volume of the resonance chamber 30. In the first and second embodiments, the case where the slit 21 having the constant width and the four slits 21A having the draft are formed in the tubular portion 2 has been shown, but the present invention is not limited to this. The number of the slits to be formed can be one or more, and the slits can have various shapes such as those having an uneven portion.
【0025】[0025]
本考案の消音器は、内燃機関の吸気系あるいは排気系の途中に設置されて使用 されたとき、共鳴室との相互作用により騒音を低減する場合、筒状部の実質的に 有効な領域は、空気通路より筒状部の他端までの長い領域と、空気通路より筒状 部のスリットまでの短い領域との2つが得られる。 When the silencer of the present invention is installed and used in the middle of the intake system or the exhaust system of an internal combustion engine, when the noise is reduced by the interaction with the resonance chamber, the substantially effective area of the tubular portion is Two areas are obtained: a long area from the air passage to the other end of the tubular portion, and a short area from the air passage to the slit of the tubular portion.
【0026】 このため、空気通路内の騒音が、筒状部および共鳴室に伝播したとき、ひとつ の筒状部を、長い領域より短い領域までの幅広い範囲で、前記長い領域に適合し た周波数の騒音と、短い領域に適合した周波数の騒音と、長い領域より短い領域 までの間の領域に適合した周波数の騒音とを、筒状部と共鳴室との相互作用によ り低減させることができる。Therefore, when the noise in the air passage propagates to the tubular portion and the resonance chamber, the frequency of one tubular portion in a wide range from a long region to a short region is adapted to the long region. Noise, the noise of the frequency adapted to the short region, and the noise of the frequency adapted to the region between the long region and the short region can be reduced by the interaction between the tubular portion and the resonance chamber. it can.
【0027】 従って、本考案の消音器は、共鳴室の容積を増すことなく、広い範囲の周波数 を減衰でき、消音効果を奏するものである。Therefore, the muffler of the present invention can attenuate a wide range of frequencies without increasing the volume of the resonance chamber and has a muffling effect.
【図1】実施例1の消音器の全体を示す断面図である。FIG. 1 is a sectional view showing an entire silencer of a first embodiment.
【図2】図1におけるAーA線断面矢視図である。2 is a sectional view taken along the line AA in FIG.
【図3】共鳴周波数に対する騒音の周波数と減衰量との
関係を示し、かつ横軸に周波数(Hz)を示し、縦軸に
減衰量(db)を示す説明図である。FIG. 3 is an explanatory diagram showing a relationship between a noise frequency and an attenuation amount with respect to a resonance frequency, a horizontal axis indicating a frequency (Hz), and a vertical axis indicating an attenuation amount (db).
【図4】実施例2の消音器の全体を示す断面図である。FIG. 4 is a sectional view showing the entire silencer of the second embodiment.
【図5】従来の消音装置(騒音低減装置)の全体を示す
骨格図である。FIG. 5 is a skeleton diagram showing an entire conventional silencer (noise reduction device).
1…消音器 2…筒状部 2a…一端部 20
…連通通路 20a…一端側開口 2b…他端部 20b…他端側開口 2
1、21A…スリット 3…密閉容器 30…共鳴室 4…吸気管 40…空気通路1 ... Silencer 2 ... Cylindrical part 2a ... One end 20
... communication passage 20a ... one end side opening 2b ... other end 20b ... other end side opening 2
1, 21A ... Slit 3 ... Airtight container 30 ... Resonance chamber 4 ... Intake pipe 40 ... Air passage
フロントページの続き (72)考案者 堀江 一幸 愛知県刈谷市豊田町1丁目1番地 豊田紡 織株式会社内Front page continued (72) Inventor Kazuyuki Horie 1-1, Toyota-cho, Kariya city, Aichi Toyota Boshoku Co., Ltd.
Claims (1)
部と、 該筒状部の他端が開口し、該気体通路の騒音を低減させ
るための共鳴室を形成する密閉容器と、よりなる消音器
であって、 前記筒状部の前記他端をもつ他端部は、前記共鳴室内に
突出しており、該他端部は、該他端より前記一端に向け
て軸方向に伸びる少なくとも1個のスリットをもつこと
を特徴とする消音器。1. A closed-ended container having one end open to a gas passage and having both ends opened, and the other end of the tubular portion opened to form a resonance chamber for reducing noise in the gas passage. In the silencer, the other end of the cylindrical portion having the other end projects into the resonance chamber, and the other end extends axially from the other end toward the one end. A muffler having at least one slit.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP224593U JPH0660718U (en) | 1993-02-01 | 1993-02-01 | Silencer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP224593U JPH0660718U (en) | 1993-02-01 | 1993-02-01 | Silencer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0660718U true JPH0660718U (en) | 1994-08-23 |
Family
ID=11523974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP224593U Pending JPH0660718U (en) | 1993-02-01 | 1993-02-01 | Silencer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0660718U (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008232053A (en) * | 2007-03-22 | 2008-10-02 | Roki Co Ltd | Sound attenuating duct |
JP2014162456A (en) * | 2013-02-28 | 2014-09-08 | Honda Motor Co Ltd | Helmholtz resonator type muffler |
-
1993
- 1993-02-01 JP JP224593U patent/JPH0660718U/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008232053A (en) * | 2007-03-22 | 2008-10-02 | Roki Co Ltd | Sound attenuating duct |
JP2014162456A (en) * | 2013-02-28 | 2014-09-08 | Honda Motor Co Ltd | Helmholtz resonator type muffler |
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