JPH08144734A - Intake resonator - Google Patents
Intake resonatorInfo
- Publication number
- JPH08144734A JPH08144734A JP28851894A JP28851894A JPH08144734A JP H08144734 A JPH08144734 A JP H08144734A JP 28851894 A JP28851894 A JP 28851894A JP 28851894 A JP28851894 A JP 28851894A JP H08144734 A JPH08144734 A JP H08144734A
- Authority
- JP
- Japan
- Prior art keywords
- port
- intake
- intake resonator
- resonator
- sound pressure
- 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
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、内燃機関の吸気系に吸
気騒音を低減させるために設けられる吸気レゾネータに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake resonator provided in an intake system of an internal combustion engine to reduce intake noise.
【０００２】[0002]
【従来の技術】吸気レゾネータは内燃機関の吸気ダクト
に連通ダクトを介して連通し、吸気ダクトの吸気騒音を
低減する。吸気レゾネータには吸気ダクト以外のポー
ト、たとえば水抜きのための孔（実開昭５６−９４８４
７号公報に開示）が設けられることがある。また、アイ
ドルアップ等のエアバイパスとしてエアクリーナホース
からエアを取出すことは多いが、何らかの理由（ユニオ
ンの廃止、ホースの短縮、搭載上の制約等）でエアクリ
ーナホースの代りに吸気レゾネータからエアを取出すこ
とが考えられ、そのような場合にも吸気レゾネータに連
通ダクト以外のポートが開口する。2. Description of the Related Art An intake resonator communicates with an intake duct of an internal combustion engine via a communication duct to reduce intake noise of the intake duct. The intake resonator has a port other than the intake duct, for example, a hole for draining water (actually, the actual opening 56-9484).
Disclosed in Japanese Patent Publication No. 7) may be provided. In addition, air is often taken out of the air cleaner hose as an air bypass for idle up, but for some reason (abolition of the union, shortening of the hose, restrictions on mounting, etc.), the air is taken out of the intake resonator instead of the air cleaner hose. However, even in such a case, ports other than the communication duct are opened in the intake resonator.
【０００３】[0003]
【発明が解決しようとする課題】しかし、吸気レゾネー
タにポートが開口すると、図２に破線（ａ）で示すよう
に、騒音低減をはかりたい所定周波数ｆ0 近傍で音圧レ
ベルがポートなしの場合に比べて上ってしまい、吸気騒
音低減効果が悪化する。本発明の目的は、吸気レゾネー
タにポートが開口することによる吸気騒音低減の悪化を
軽減することにある。However, when the port is opened in the intake resonator, as shown by the broken line (a) in FIG. 2, when the sound pressure level is near the predetermined frequency f 0 where there is no noise and there is no port. And the intake noise reduction effect deteriorates. An object of the present invention is to reduce deterioration of intake noise reduction due to opening of a port in an intake resonator.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
の本発明の吸気レゾネータは次の通りである。吸気ダク
トとの連通ダクトと該連通ダクト以外のポートとが開口
した吸気レゾネータにおいて、該吸気レゾネータ内に仕
切壁を設けて該仕切壁に複数の小孔を設け、該複数の小
孔のそれぞれを起点として発生する回折波の干渉によっ
て生じる音圧が理論上ゼロとなる部位に前記ポートの吸
気レゾネータへの開口端を位置させた吸気レゾネータ。[MEANS FOR SOLVING THE PROBLEMS] The intake resonator of the present invention for achieving the above object is as follows. In an intake resonator in which a communication duct with the intake duct and a port other than the communication duct are open, a partition wall is provided in the intake resonator, a plurality of small holes are provided in the partition wall, and each of the plurality of small holes is provided. An intake resonator in which the opening end of the port to the intake resonator is located at a position where the sound pressure generated by the interference of diffracted waves generated as a starting point is theoretically zero.
【０００５】[0005]
【作用】上記本発明の吸気レゾネータでは、仕切壁で仕
切られた２室のうち吸気ダクト側の室の共鳴周波数ｆ0
の音波により、仕切壁に設けられた複数の小孔のそれぞ
れを起点として、仕切壁で仕切られた２室のうちポート
側の室に、回折波（二次波）が発生する。複数の小孔の
それぞれから発生した回折波同志は互いに干渉して、１
つの小孔からの回折波の山の部分と他の小孔からの回折
波の谷の部分とが重なった部位に、音圧ゼロの部分が生
じる。この音圧ゼロの部分にポートの開口端が位置して
いるので、ポートの開口端の有無が理論的に音圧上吸気
レゾネータに影響を与えないことになり、ポート無しの
場合に近づく。したがって、ポートが存在しても、周波
数ｆ0 の吸気騒音の低減作用上はポートが無い場合と同
じように吸気レゾネータが働き、所定周波数でのポート
による騒音低減作用の悪化は軽減される。In the intake resonator of the present invention, the resonance frequency f 0 of the chamber on the intake duct side of the two chambers partitioned by the partition wall.
By the sound wave of, the diffracted wave (secondary wave) is generated in the port-side chamber of the two chambers partitioned by the partition wall, starting from each of the plurality of small holes provided in the partition wall. Diffracted waves generated from each of a plurality of small holes interfere with each other and
A portion with zero sound pressure is generated at a portion where a peak portion of a diffracted wave from one small hole and a trough portion of a diffracted wave from another small hole overlap each other. Since the opening end of the port is located at the portion where the sound pressure is zero, the presence or absence of the opening end of the port theoretically does not affect the intake resonator on the sound pressure, and approaches the case without the port. Therefore, even if there is a port, the intake resonator operates in the same way as in the case where there is no port in reducing the intake noise at the frequency f 0 , and the deterioration of the noise reducing action by the port at a predetermined frequency is reduced.
【０００６】[0006]
【実施例】以下に、本発明の望ましい実施例を図１およ
び図２を参照して説明する。図１において、吸気レゾネ
ータ１は内燃機関の吸気ダクト（吸気ホース）２に連通
ダクト３を介して連通している。吸気レゾネータ１には
連通ダクト３以外のポート４が開口している。図示例で
はポート４をエアバイパス通路５によりサージタンク６
に連通したものを示したが、ポート４はエアバイパス通
路に限らず、水抜き穴などであってもよい。ポート４は
吸気レゾネータ１内に突出したものであってもよいし、
突出していなくてもよい。７は絞り弁である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, an intake resonator 1 communicates with an intake duct (intake hose) 2 of an internal combustion engine via a communication duct 3. A port 4 other than the communication duct 3 is opened in the intake resonator 1. In the illustrated example, the port 4 is connected to the surge tank 6 by the air bypass passage 5.
The port 4 is not limited to the air bypass passage but may be a drain hole or the like. The port 4 may be one that protrudes into the intake resonator 1,
It does not have to project. Reference numeral 7 is a throttle valve.
【０００７】吸気レゾネータ１内には仕切壁８が設けら
れていて、吸気レゾネータ１内を２つの室９、１０に分
けている。一方の室９に連通ダクト３が開口し、他方の
室１０にポート４が開口する。連通ダクト３が開口する
室９の容積Ｖは、低減したい音の周波数（ヘルムホルツ
吸気レゾネータ１の共振周波数ｆ0 ）と次の関係をもつ
ように設定される。ただし、次式でｒは連通ダクト３の
半径、Ｌは連通ダクト３の長さである。A partition wall 8 is provided in the intake resonator 1 and divides the intake resonator 1 into two chambers 9, 10. The communication duct 3 opens in one chamber 9 and the port 4 opens in the other chamber 10. The volume V of the chamber 9 in which the communication duct 3 opens is set so as to have the following relationship with the frequency of the sound to be reduced (resonance frequency f 0 of the Helmholtz intake resonator 1). However, in the following equation, r is the radius of the communication duct 3, and L is the length of the communication duct 3.
【０００８】[0008]
【数１】 [Equation 1]
【０００９】仕切壁８には複数の小孔１１、１２（図示
例では２個の場合を示したが２個に限るものではない）
が穿設されている。小孔１１と連通ダクト３の吸気レゾ
ネータ開口部１３との距離ｌ3 と、小孔１２の連通ダク
ト３の吸気レゾネータ開口部１３との距離ｌ4 とは互い
に等しいかまたはｌ3 −ｌ4 ＝ｎλ0 、（ｎは整数）の
関係にある。これによって、小孔１１、１２を起点とし
て同位相の回折波（二次波）が、ポート４が開口してい
る側の室１０内に生成する（ホイヘンスの原理）。The partition wall 8 has a plurality of small holes 11 and 12 (two holes are shown in the illustrated example, but the number is not limited to two).
Has been drilled. Small hole 11 and the communication duct between the distance l 3 of the intake resonator opening 13 of 3, low air intake communicating duct 3 holes 12 resonator openings 13 and the distance l 4 equal or l 3 to each other and -l 4 = There is a relationship of nλ 0 and (n is an integer). As a result, diffracted waves (secondary waves) of the same phase with the small holes 11 and 12 as the starting points are generated in the chamber 10 on the side where the port 4 is opened (Huygens' principle).
【００１０】そして、ポート４の吸気レゾネータ１への
開口端１４は、複数の小孔１１、１２のそれぞれを起点
として発生して球面状に伝播する回折波の干渉によって
生じる音圧が理論上ゼロとなる部位に位置されている。
音圧ゼロの部位は、一つの小孔１１からの二次波の山
と、別の小孔１２からの二次波の谷とが交叉する部位で
あり、２つの二次波の山と谷とが重合して音圧がゼロと
なる部位である。小孔１１とポート４の吸気レゾネータ
開口部１４との距離をｌ1 とし、小孔１２とポート４の
吸気レゾネータ開口部１４との距離をｌ2 とし、ヘルム
ホルツ吸気レゾネータ１の共鳴周波数ｆ0 のときの音波
の波長をλ0 （＝ｃ／ｆ0 、ｃは音速）とすると、次の
関係がある。ただし、小孔１１、１２の径ｄは波長λ0
に比べてはるかに小さい値にし、回折現象が円滑に生じ
るようにする。The opening end 14 of the port 4 to the intake resonator 1 theoretically has a sound pressure of zero due to interference of diffracted waves that originate from each of the plurality of small holes 11 and 12 and propagate in a spherical shape. It is located in the part that becomes.
The part where the sound pressure is zero is the part where the peak of the secondary wave from one small hole 11 and the trough of the secondary wave from another small hole 12 intersect, and the peak and the valley of the two secondary waves. Is a part where the sound pressure is zero due to polymerization. The distance between the small hole 11 and the intake resonator opening portion 14 of the port 4 is l 1 , the distance between the small hole 12 and the intake resonator opening portion 14 of the port 4 is l 2, and the resonance frequency f 0 of the Helmholtz intake resonator 1 When the wavelength of the sound wave at this time is λ 0 (= c / f 0 , c is the speed of sound), the following relationship is established. However, the diameter d of the small holes 11 and 12 depends on the wavelength λ 0.
The value is much smaller than that of so that the diffraction phenomenon occurs smoothly.
【００１１】[0011]
【数２】 [Equation 2]
【００１２】つぎに、作用を説明する。本発明実施例の
吸気レゾネータ１にポート４を設けたため、エアを取り
出したり水抜きができる。そして、通常はポート４を設
けると、圧もれが生じて吸気レゾネータ１の共鳴周波数
ｆ0 における吸気騒音作用が悪化するが、本発明実施例
では、悪化が以下の理由により軽減される。すなわち、
複数の小孔１１、１２が穿設された仕切板８を設けて音
圧ゼロの部位（各孔からの回折波が半波長ずれた部位）
を作り、そこにポート４の開口端１４を位置させたの
で、共鳴周波数領域でポート４の存在が吸気レゾネータ
１の音圧、したがって吸気音低減作用に影響を与えなく
なる。Next, the operation will be described. Since the intake resonator 1 of the embodiment of the present invention is provided with the port 4, it is possible to take out air and drain water. Normally, when the port 4 is provided, pressure leakage occurs and the intake noise effect at the resonance frequency f 0 of the intake resonator 1 deteriorates, but in the embodiment of the present invention, the deterioration is reduced for the following reasons. That is,
A part where the sound pressure is zero by providing a partition plate 8 in which a plurality of small holes 11 and 12 are formed (a part where the diffracted wave from each hole is shifted by a half wavelength)
Since the open end 14 of the port 4 is located there, the presence of the port 4 does not affect the sound pressure of the intake resonator 1 and hence the intake sound reducing action in the resonance frequency region.
【００１３】図２は、ポートなしの場合と、従来のポー
ト有りの場合（ａ）と、本発明実施例の音圧ゼロの部位
にポートを設けた場合（ｂ）の、それぞれの音圧レベル
の試験結果を示している。図２から明らかなように、吸
気レゾネータ１の共鳴周波数領域ｆ0 で、従来のポート
有り（ａ）の場合は音圧レベルの低下が悪化している
が、本発明実施例の場合（ｂ）ではポートなしに近づい
て悪化が軽減される。FIG. 2 shows the sound pressure levels of the case without a port, the case with a conventional port (a), and the case where a port is provided at a portion where the sound pressure is zero in the embodiment of the present invention (b). Shows the test results of. As is clear from FIG. 2, in the resonance frequency region f 0 of the intake resonator 1, the sound pressure level deteriorates worse when the conventional port is provided (a), but in the embodiment of the present invention (b). Then, getting closer to without a port reduces the deterioration.
【００１４】[0014]
【発明の効果】請求項１の吸気レゾネータによれば、吸
気レゾネータの複数の小孔が穿設された仕切壁を設け、
小孔の回折波の干渉によって理論上音圧ゼロとなる部位
にポートの開口端を位置させたので、ポートの音圧に与
える影響が小さくなり、吸気レゾネータの共鳴周波数領
域における吸気騒音低減効果の、ポートの存在による悪
化が、軽減される。また、ポート径をある程度自由に変
えてもよくなり、設計の自由度が向上する。According to the intake resonator of the first aspect, the partition wall is provided with a plurality of small holes of the intake resonator.
Since the opening end of the port is located at the position where the sound pressure theoretically becomes zero due to the interference of the diffracted waves of the small holes, the effect on the sound pressure of the port is reduced, and the intake noise reduction effect in the resonance frequency range of the intake resonator is reduced. , The deterioration due to the existence of the port is reduced. Also, the port diameter may be changed to some extent, which improves the degree of freedom in design.
【図１】本発明の一実施例に係る吸気レゾネータとその
近傍の概略断面図である。FIG. 1 is a schematic sectional view of an intake resonator and its vicinity according to an embodiment of the present invention.
【図２】ポートなし、従来のポート有り、本発明のポー
ト有りの、それぞれの場合の音圧レベルと周波数の関係
図である。FIG. 2 is a relationship diagram of sound pressure level and frequency in each case with no port, with conventional port, and with port of the present invention.
１ 吸気レゾネータ ２ 吸気ダクト ３ 連通ダクト ４ ポート ６ サージタンク ８ 仕切板 ９、１０ 室 １１、１２ 小孔 １４ ポート開口端 1 intake resonator 2 intake duct 3 communication duct 4 port 6 surge tank 8 partition plate 9, 10 chamber 11, 12 small hole 14 port open end
Claims (1)
ト以外のポートとが開口した吸気レゾネータにおいて、
該吸気レゾネータ内に仕切壁を設けて該仕切壁に複数の
小孔を設け、該複数の小孔のそれぞれを起点として発生
する回折波の干渉によって生じる音圧が理論上ゼロとな
る部位に前記ポートの吸気レゾネータへの開口端を位置
させたことを特徴とする吸気レゾネータ。1. An intake resonator in which a communication duct with an intake duct and a port other than the communication duct are open,
A partition wall is provided in the intake resonator, a plurality of small holes are provided in the partition wall, and the sound pressure generated by the interference of the diffracted waves generated from each of the plurality of small holes is theoretically zero at a portion where An intake resonator characterized in that the open end of the port to the intake resonator is located.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28851894A JPH08144734A (en) | 1994-11-24 | 1994-11-24 | Intake resonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28851894A JPH08144734A (en) | 1994-11-24 | 1994-11-24 | Intake resonator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08144734A true JPH08144734A (en) | 1996-06-04 |
Family
ID=17731275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28851894A Pending JPH08144734A (en) | 1994-11-24 | 1994-11-24 | Intake resonator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08144734A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013089010A1 (en) * | 2011-12-15 | 2013-06-20 | 株式会社マーレ フィルターシステムズ | Air intake device for internal combustion engine |
| JP2014169654A (en) * | 2013-03-01 | 2014-09-18 | Mitsubishi Motors Corp | Condensed water discharge device |
| RU2767126C1 (en) * | 2021-06-29 | 2022-03-16 | Акционерное общество «АВТОВАЗ» | Reciprocating internal combustion engine intake system |
-
1994
- 1994-11-24 JP JP28851894A patent/JPH08144734A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013089010A1 (en) * | 2011-12-15 | 2013-06-20 | 株式会社マーレ フィルターシステムズ | Air intake device for internal combustion engine |
| JP2013124599A (en) * | 2011-12-15 | 2013-06-24 | Mahle Filter Systems Japan Corp | Intake device of internal combustion engine |
| JP2014169654A (en) * | 2013-03-01 | 2014-09-18 | Mitsubishi Motors Corp | Condensed water discharge device |
| RU2767126C1 (en) * | 2021-06-29 | 2022-03-16 | Акционерное общество «АВТОВАЗ» | Reciprocating internal combustion engine intake system |
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