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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