JP2015151956A - Intake resonator of internal combustion engine - Google Patents
Intake resonator of internal combustion engine Download PDFInfo
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本発明は、吸気ダクトで発生する吸気騒音を共鳴作用により低減する内燃機関の吸気レゾネータに関する。 The present invention relates to an intake resonator for an internal combustion engine that reduces intake noise generated in an intake duct by resonance.
特許文献１には、ヘルムホルツ型の吸気レゾネータが開示されている。同文献に記載の吸気レゾネータは、吸気ダクトから分岐する分岐管と、同分岐管に設けられた共鳴箱とを備えており、吸気ダクトで発生する吸気騒音における特定の周波数の成分が同分岐管及び同共鳴箱での共鳴作用により低減される。 Patent Document 1 discloses a Helmholtz-type intake resonator. The intake resonator described in the same document includes a branch pipe branched from the intake duct and a resonance box provided in the branch pipe, and a component of a specific frequency in intake noise generated in the intake duct is provided in the branch pipe. And reduced by the resonance action in the same resonance box.
ところで、吸気レゾネータにおいては、分岐管の容積と共鳴箱の容積との総和が大きいほど吸気騒音の低減効果が大きくなる。しかしながら、吸気騒音の低減効果を高めるために前記容積を大きくすると、吸気レゾネータの大型化を招くといった新たな問題が生じることとなる。 By the way, in the intake resonator, the effect of reducing the intake noise increases as the sum of the volume of the branch pipe and the volume of the resonance box increases. However, if the volume is increased in order to enhance the effect of reducing the intake noise, a new problem such as an increase in the size of the intake resonator occurs.
本発明の目的は、吸気ダクトで発生する吸気騒音を低減することのできる内燃機関の吸気レゾネータを提供することにある。 An object of the present invention is to provide an intake resonator for an internal combustion engine that can reduce intake noise generated in an intake duct.
上記目的を達成するための内燃機関の吸気レゾネータは、吸気ダクトから分岐する分岐管と、同分岐管の先端に設けられた共鳴箱とを備え、前記吸気ダクトで発生する吸気騒音を同分岐管及び同共鳴箱での共鳴作用により低減する。前記分岐管及び前記共鳴箱の少なくとも一方の内部空間を複数の空間に区画するフィルタが設けられている。 An intake resonator for an internal combustion engine for achieving the above object includes a branch pipe branched from the intake duct and a resonance box provided at a tip of the branch pipe, and intake noise generated in the intake duct is supplied to the branch pipe. And reduced by the resonance action in the same resonance box. A filter that divides at least one internal space of the branch pipe and the resonance box into a plurality of spaces is provided.
同構成によれば、吸気の波（音波）が吸気ダクトから分岐管を通じて共鳴箱に伝播する際に、吸気の波のエネルギの一部がフィルタに吸収されて減衰されることとなる。また、吸気の波が共鳴箱から分岐管を通じて吸気ダクトに伝播する際にも、上記フィルタを通過する。このとき、吸気の波のエネルギの一部が吸収されて減衰されることとなる。 According to this configuration, when the intake wave (sound wave) propagates from the intake duct to the resonance box through the branch pipe, a part of the energy of the intake wave is absorbed by the filter and attenuated. Also, when the wave of the intake air propagates from the resonance box to the intake duct through the branch pipe, it passes through the filter. At this time, a part of the energy of the wave of the intake air is absorbed and attenuated.
本発明によれば、吸気ダクトで発生する吸気騒音を低減することができる。 According to the present invention, intake noise generated in the intake duct can be reduced.
以下、図１〜図５を参照して、一実施形態について説明する。
図１に示すように、内燃機関においては、エアクリーナにより濾過された吸気が吸気ダクト１０を通じて燃焼室に導入される。
Hereinafter, an embodiment will be described with reference to FIGS.
As shown in FIG. 1, in an internal combustion engine, intake air filtered by an air cleaner is introduced into a combustion chamber through an intake duct 10.
吸気レゾネータ２０は、吸気ダクト１０から分岐して延びる分岐管２２と、同分岐管２２の先端に設けられた共鳴箱２４とを備えている。分岐管２２及び共鳴箱２４はいずれも合成樹脂材料からなり、吸気ダクト１０の周壁の接続口１０ａに分岐管２２の基端が溶着されている。 The intake resonator 20 includes a branch pipe 22 that branches off from the intake duct 10 and a resonance box 24 provided at the tip of the branch pipe 22. Both the branch pipe 22 and the resonance box 24 are made of a synthetic resin material, and the base end of the branch pipe 22 is welded to the connection port 10 a on the peripheral wall of the intake duct 10.
共鳴箱２４は、分岐管２２の先端が開口する下壁２４ａ、同下壁２４ａと間隔をおいて対向配置された上壁２４ｂ、及び下壁２４ａと上壁２４ｂとの間に設けられた側壁２４ｃを備えている。 The resonance box 24 includes a lower wall 24a in which the tip of the branch pipe 22 is open, an upper wall 24b disposed to face the lower wall 24a at an interval, and a side wall provided between the lower wall 24a and the upper wall 24b. 24c.
共鳴箱２４の下壁２４ａの内面には、分岐管２２の箱側開口部２２ｂを覆うフィルタ３０が接着されている。このフィルタ３０は下壁２４ａの内面全体にわたって設けられている。前記フィルタ３０によって、分岐管２２及び共鳴箱２４の内部空間が、分岐管２２のダクト側開口部２２ａを含む第１空間Ｃ１と、ダクト側開口部２２ａを含まない第２空間Ｃ２とに区画されている。 A filter 30 that covers the box side opening 22b of the branch pipe 22 is bonded to the inner surface of the lower wall 24a of the resonance box 24. The filter 30 is provided over the entire inner surface of the lower wall 24a. The filter 30 divides the internal space of the branch pipe 22 and the resonance box 24 into a first space C1 that includes the duct side opening 22a of the branch pipe 22 and a second space C2 that does not include the duct side opening 22a. ing.
図２に示すように、フィルタ３０は、互いに対向配置された一対の内側ネット３６を備えており、一対の内側ネット３６の間には蒸発燃料を吸着可能な粒状の吸着材３８が接着剤を介して保持されている。また、一対の内側ネット３６は一対の不織布３４によって挟まれている。また、一対の不織布３４は、一対の外側ネット３２によって挟まれている。なお、内側ネット３６及び外側ネット３２は共にガラス繊維によって形成されている。また、内側ネット３６と不織布３４とは接着されており、不織布３４と外側ネット３２とは接着されている。また、吸着材３８としては例えば活性炭が好ましい。 As shown in FIG. 2, the filter 30 includes a pair of inner nets 36 disposed to face each other, and a granular adsorbent 38 capable of adsorbing evaporated fuel is interposed between the pair of inner nets 36. Is held through. The pair of inner nets 36 is sandwiched between a pair of nonwoven fabrics 34. Further, the pair of nonwoven fabrics 34 is sandwiched between the pair of outer nets 32. Both the inner net 36 and the outer net 32 are made of glass fiber. Further, the inner net 36 and the nonwoven fabric 34 are bonded, and the nonwoven fabric 34 and the outer net 32 are bonded. Moreover, as the adsorbent 38, for example, activated carbon is preferable.
次に、本実施形態の作用について説明する。
図３に実線の矢印にて示すように、吸気レゾネータ２０においては、内燃機関の運転時に吸気ダクト１０から分岐管２２を通じて共鳴箱２４に伝播する吸気の波（音波）がフィルタ３０を通過することとなる。このとき、吸気の波のエネルギの一部がフィルタ３０において吸収されて減衰されることとなる。
Next, the operation of this embodiment will be described.
As indicated by a solid arrow in FIG. 3, in the intake resonator 20, intake waves (sound waves) propagating from the intake duct 10 to the resonance box 24 through the branch pipe 22 during operation of the internal combustion engine pass through the filter 30. It becomes. At this time, a part of the energy of the wave of the intake air is absorbed by the filter 30 and attenuated.
また、図３に破線の矢印にて示すように、共鳴箱２４から分岐管２２を通じて吸気ダクト１０に伝播する吸気の波がフィルタ３０を通過することとなる。このとき、吸気の波のエネルギの一部が吸収されて減衰されることとなる。 Further, as indicated by a broken line arrow in FIG. 3, an intake wave propagating from the resonance box 24 to the intake duct 10 through the branch pipe 22 passes through the filter 30. At this time, a part of the energy of the wave of the intake air is absorbed and attenuated.
このようにして吸気の波のエネルギが減衰されることで、吸気ダクト１０で発生する吸気騒音を効果的に低減することができる。
これに対して、図４に示すように、比較例の吸気レゾネータ１２０においては、共鳴箱１２４の上壁１２４ｂの内面にフィルタ１３０が接着されている。この場合、吸気の波は吸気ダクト１１０から分岐管１２２を通じて共鳴箱１２４に伝播することとなるが、吸気の波の一部はフィルタ１３０に衝突することなく吸気ダクト１１０に流出することとなる。そのため、吸気の波のエネルギのうちフィルタ１３０に吸収される割合が、本実施形態の吸気レゾネータ２０に比べて小さく、吸気ダクト１１０で発生する吸気騒音の低減効果が小さいものとなる。
In this way, the energy of the intake wave is attenuated, so that intake noise generated in the intake duct 10 can be effectively reduced.
On the other hand, as shown in FIG. 4, in the intake resonator 120 of the comparative example, a filter 130 is bonded to the inner surface of the upper wall 124 b of the resonance box 124. In this case, the intake wave propagates from the intake duct 110 to the resonance box 124 through the branch pipe 122, but part of the intake wave flows out to the intake duct 110 without colliding with the filter 130. Therefore, the proportion of the intake wave energy absorbed by the filter 130 is smaller than that of the intake resonator 20 of the present embodiment, and the effect of reducing the intake noise generated in the intake duct 110 is small.
次に、図５を参照して、吸気レゾネータ２０，１２０による減音量の測定結果について説明する。なお、図５では、本実施形態の吸気レゾネータ２０の測定結果が実線にて示され、比較例の吸気レゾネータ１２０の測定結果が破線にて示されている。また、フィルタが設けられていない吸気レゾネータの測定結果が一点鎖線にて示されている。ここでの減音量は、吸気レゾネータが設けられていない吸気ダクトで発生する吸気騒音の大きさを基準とした値である。従って、図５においては、吸気レゾネータが設けられていない吸気ダクトに対する減音効果が大きいほど減音量がプラスに大きい値として示される。 Next, with reference to FIG. 5, the measurement result of the volume reduction by the intake resonators 20 and 120 will be described. In FIG. 5, the measurement result of the intake resonator 20 of the present embodiment is indicated by a solid line, and the measurement result of the intake resonator 120 of the comparative example is indicated by a broken line. In addition, the measurement result of the intake resonator not provided with the filter is indicated by a one-dot chain line. The volume reduction here is a value based on the magnitude of intake noise generated in an intake duct not provided with an intake resonator. Therefore, in FIG. 5, the greater the noise reduction effect for the intake duct not provided with the intake resonator, the greater the volume reduction is shown as a positive value.
図５にて示すように、本実施形態の吸気レゾネータ２０では、所定の周波数Ｆ１以上の高周波数帯において、比較例の吸気レゾネータ１２０や、フィルタが設けられていない吸気レゾネータに比べて、減音量が大きい、すなわち吸気騒音の低減効果が大きいといえる。 As shown in FIG. 5, in the intake resonator 20 of the present embodiment, the volume is reduced in the high frequency band of the predetermined frequency F1 or higher compared to the intake resonator 120 of the comparative example and the intake resonator in which no filter is provided. It can be said that the effect of reducing intake noise is large.
以上説明した本実施形態に係る内燃機関の吸気レゾネータによれば、以下に示す効果が得られるようになる。
（１）内燃機関の吸気レゾネータ２０は、吸気ダクト１０から分岐する分岐管２２と、同分岐管２２の先端に設けられた共鳴箱２４とを備え、吸気ダクト１０で発生する吸気騒音を同分岐管２２及び同共鳴箱２４での共鳴作用により低減する。分岐管２２及び共鳴箱２４の内部空間を、分岐管２２の吸気ダクト１０に開口するダクト側開口部２２ａを含む第１空間Ｃ１と、同ダクト側開口部２２ａを含まない第２空間Ｃ２とに区画するフィルタ３０が設けられている。フィルタ３０は分岐管２２の共鳴箱２４に開口する箱側開口部２２ｂを覆っている。
According to the intake resonator of the internal combustion engine according to the present embodiment described above, the following effects can be obtained.
(1) The intake resonator 20 of the internal combustion engine is provided with a branch pipe 22 branched from the intake duct 10 and a resonance box 24 provided at the tip of the branch pipe 22, and the intake noise generated in the intake duct 10 is branched. It is reduced by the resonance action in the tube 22 and the resonance box 24. The internal space of the branch pipe 22 and the resonance box 24 is divided into a first space C1 including a duct side opening 22a that opens to the intake duct 10 of the branch pipe 22, and a second space C2 that does not include the duct side opening 22a. A partitioning filter 30 is provided. The filter 30 covers the box-side opening 22 b that opens to the resonance box 24 of the branch pipe 22.
こうした構成によれば、吸気ダクト１０から分岐管２２を通じて共鳴箱２４に伝播する吸気の波がフィルタ３０を通過することとなる。このとき、吸気の波のエネルギの一部がフィルタ３０において吸収されて減衰されることとなる。また、共鳴箱２４から分岐管２２を通じて吸気ダクト１０に伝播する吸気の波がフィルタ３０を通過することとなる。このとき、吸気の波のエネルギの一部が吸収されて減衰されることとなる。従って、吸気レゾネータ２０の体格を増大させることなく、吸気ダクト１０で発生する吸気騒音を効果的に低減することができる。 According to such a configuration, an intake wave propagating from the intake duct 10 to the resonance box 24 through the branch pipe 22 passes through the filter 30. At this time, a part of the energy of the wave of the intake air is absorbed by the filter 30 and attenuated. In addition, an intake wave propagating from the resonance box 24 to the intake duct 10 through the branch pipe 22 passes through the filter 30. At this time, a part of the energy of the wave of the intake air is absorbed and attenuated. Therefore, the intake noise generated in the intake duct 10 can be effectively reduced without increasing the size of the intake resonator 20.
（２）フィルタ３０は内燃機関の蒸発燃料を吸着する吸着材３８を有している。
こうした構成によれば、１つのフィルタ３０によって、機関運転時に吸気ダクト１０で発生する吸気騒音を低減することができるとともに、機関停止時に吸気ダクト１０に存在する蒸発燃料を吸着することができる。
(2) The filter 30 has an adsorbent 38 that adsorbs the evaporated fuel of the internal combustion engine.
According to such a configuration, the single filter 30 can reduce intake noise generated in the intake duct 10 during engine operation, and can adsorb evaporated fuel present in the intake duct 10 when the engine is stopped.
（３）フィルタ３０は共鳴箱２４の下壁２４ａの内面全体にわたって設けられている。
こうした構成によれば、分岐管２２の内部にフィルタが設けられる場合に比べて、フィルタ３０の表面積が大きくなることから、多くの蒸発燃料を吸着することができる。また、上壁１２４ｂの内面にフィルタ１３０が設けられた比較例の吸気レゾネータ１２０に比べて、共鳴箱２４に流入する蒸発燃料のうちフィルタ３０の吸着材３８と接触する割合が多くなる。従って、共鳴箱２４に流入する蒸発燃料を効率よくフィルタ３０に吸着させることができ、蒸発燃料の吸着量を増大させることができる。
(3) The filter 30 is provided over the entire inner surface of the lower wall 24a of the resonance box 24.
According to such a configuration, since the surface area of the filter 30 is larger than when the filter is provided inside the branch pipe 22, a large amount of evaporated fuel can be adsorbed. In addition, as compared with the intake resonator 120 of the comparative example in which the filter 130 is provided on the inner surface of the upper wall 124b, the ratio of the evaporated fuel flowing into the resonance box 24 that contacts the adsorbent 38 of the filter 30 is increased. Therefore, the evaporated fuel flowing into the resonance box 24 can be efficiently adsorbed by the filter 30 and the amount of evaporated fuel adsorbed can be increased.
（４）フィルタ３０は共鳴箱２４の下壁２４ａに取り付けられている。このため、吸気レゾネータ２０に対してフィルタ３０を容易且つ安定的に取り付けることができる。
なお、本発明に係る内燃機関の吸気レゾネータは、上記実施形態にて例示した構成に限定されるものではなく、これを適宜変更した例えば次のような形態として実施することもできる。
(4) The filter 30 is attached to the lower wall 24 a of the resonance box 24. For this reason, the filter 30 can be easily and stably attached to the intake resonator 20.
Note that the intake resonator of the internal combustion engine according to the present invention is not limited to the configuration exemplified in the above embodiment, and can be implemented as, for example, the following form appropriately modified.
・図６に示すように、共鳴箱２２４の下壁２２４ａと上壁２２４ｂとの間にフィルタ２３０が位置するように同フィルタ２３０の周縁を側壁２２４ｃの内面に固定するようにしてもよい。この場合においても、図４に示す比較例の吸気レゾネータ１２０に比べて、共鳴箱２２４に伝播する吸気の波の多くがフィルタ２３０を通過することとなる。従って、吸気ダクト２１０で発生する吸気騒音を低減することができる。 As shown in FIG. 6, the periphery of the filter 230 may be fixed to the inner surface of the side wall 224c so that the filter 230 is positioned between the lower wall 224a and the upper wall 224b of the resonance box 224. Also in this case, much of the intake wave propagating to the resonance box 224 passes through the filter 230 as compared to the intake resonator 120 of the comparative example shown in FIG. Therefore, intake noise generated in the intake duct 210 can be reduced.
・図７に示すように、分岐管３２２の内部にフィルタ３３０を設けるようにしてもよい。この場合においても、共鳴箱３２４に伝播する吸気の波の全てがフィルタ３３０を通過することとなる。また、共鳴箱３２４から分岐管３２２を通じて吸気ダクト３１０に伝播する吸気の波の全てがフィルタ３３０を通過することとなる。従って、上記実施形態の効果（１）に準じた効果を奏することができる。 As shown in FIG. 7, a filter 330 may be provided inside the branch pipe 322. Even in this case, all of the intake waves propagating to the resonance box 324 pass through the filter 330. Further, all of the intake waves propagating from the resonance box 324 to the intake duct 310 through the branch pipe 322 pass through the filter 330. Therefore, the effect according to the effect (1) of the above embodiment can be obtained.
・分岐管及び共鳴箱の少なくとも一方に複数枚のフィルタを設けることもできる。この場合、共鳴箱及び分岐管の双方の内部にフィルタを設けるようにしてもよい。
・吸着材をゼオライトなどの活性炭以外の材料に変更してもよい。
A plurality of filters can be provided in at least one of the branch pipe and the resonance box. In this case, a filter may be provided inside both the resonance box and the branch pipe.
-The adsorbent may be changed to a material other than activated carbon such as zeolite.
・吸着材を有していないフィルタを採用することもできる。この場合であっても、上記実施形態の効果（１）に準じた効果を奏することができる。 A filter that does not have an adsorbent can also be used. Even in this case, the effect according to the effect (1) of the embodiment can be obtained.
１０，２１０，３１０…吸気ダクト、１０ａ…接続口、２０，２２０，３２０…吸気レゾネータ、２２，２２２，３２２…分岐管、２２ａ…ダクト側開口部、２２ｂ…箱側開口部、２４，２２４，３２４…共鳴箱、２４ａ，２２４ａ…下壁、２４ｂ，２２４ｂ…上壁、２４ｃ，２２４ｃ…側壁、３０，２３０，３３０…フィルタ、３２…外側ネット、３４…不織布、３６…内側ネット、３８…吸着材。 10, 210, 310 ... intake duct, 10a ... connection port, 20, 220, 320 ... intake resonator, 22, 222, 322 ... branch pipe, 22a ... duct side opening, 22b ... box side opening, 24, 224 324 ... Resonance box, 24a, 224a ... Lower wall, 24b, 224b ... Upper wall, 24c, 224c ... Side wall, 30, 230, 330 ... Filter, 32 ... Outer net, 34 ... Nonwoven fabric, 36 ... Inner net, 38 ... Adsorption Wood.
Claims (4)
前記分岐管及び前記共鳴箱の少なくとも一方の内部空間を複数の空間に区画するフィルタが設けられている、
内燃機関の吸気レゾネータ。 An internal combustion engine comprising: a branch pipe branched from an intake duct; and a resonance box provided at a tip of the branch pipe, wherein the intake noise generated in the intake duct is reduced by a resonance action in the branch pipe and the resonance box. In the intake resonator,
A filter that divides at least one internal space of the branch pipe and the resonance box into a plurality of spaces is provided.
An intake resonator for an internal combustion engine.
請求項１に記載の内燃機関の吸気レゾネータ。 The filter has an adsorbent that adsorbs the evaporated fuel of the internal combustion engine,
The intake resonator for an internal combustion engine according to claim 1.
請求項１又は請求項２に記載の内燃機関の吸気レゾネータ。 The filter divides the internal space of the branch pipe and the resonance box into a space including an opening opening to the intake duct of the branch pipe and a space not including the opening.
An intake resonator for an internal combustion engine according to claim 1 or 2.
請求項３に記載の内燃機関の吸気レゾネータ。 The filter is provided inside the resonance box and covers an opening that opens to the resonance box of the branch pipe.
An intake resonator for an internal combustion engine according to claim 3.
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| JP2014027492A JP6187301B2 (en) | 2014-02-17 | 2014-02-17 | Intake resonator for internal combustion engine |
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| JP2014027492A JP6187301B2 (en) | 2014-02-17 | 2014-02-17 | Intake resonator for internal combustion engine |
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| JP6187301B2 JP6187301B2 (en) | 2017-08-30 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59170672U (en) * | 1983-04-30 | 1984-11-15 | 日野自動車株式会社 | engine intake system |
| JPS60125764A (en) * | 1983-12-08 | 1985-07-05 | Nissan Motor Co Ltd | Resonator for vehicle |
| US5493080A (en) * | 1993-03-05 | 1996-02-20 | Ab Volvo | External arrangement for damping sounds in a pipe system |
| JP2001165009A (en) * | 1999-12-09 | 2001-06-19 | Aisan Ind Co Ltd | Fuel evaporative gas emission preventing device |
| JP2002276486A (en) * | 2001-03-16 | 2002-09-25 | Toyoda Spinning & Weaving Co Ltd | Air cleaner for internal combustion engine and adsorption filter |
| JP2003214264A (en) * | 2002-01-22 | 2003-07-30 | Nippon Soken Inc | Evaporated fuel adsorbing device |
| JP2009281301A (en) * | 2008-05-23 | 2009-12-03 | Kojima Press Industry Co Ltd | Helmholtz resonator |
| EP2541034A1 (en) * | 2011-06-28 | 2013-01-02 | Röchling Automotive AG & Co. KG | Motor vehicle ventilation channel with dampened Helmholtz resonator |
-
2014
- 2014-02-17 JP JP2014027492A patent/JP6187301B2/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59170672U (en) * | 1983-04-30 | 1984-11-15 | 日野自動車株式会社 | engine intake system |
| JPS60125764A (en) * | 1983-12-08 | 1985-07-05 | Nissan Motor Co Ltd | Resonator for vehicle |
| US5493080A (en) * | 1993-03-05 | 1996-02-20 | Ab Volvo | External arrangement for damping sounds in a pipe system |
| JP2001165009A (en) * | 1999-12-09 | 2001-06-19 | Aisan Ind Co Ltd | Fuel evaporative gas emission preventing device |
| JP2002276486A (en) * | 2001-03-16 | 2002-09-25 | Toyoda Spinning & Weaving Co Ltd | Air cleaner for internal combustion engine and adsorption filter |
| JP2003214264A (en) * | 2002-01-22 | 2003-07-30 | Nippon Soken Inc | Evaporated fuel adsorbing device |
| JP2009281301A (en) * | 2008-05-23 | 2009-12-03 | Kojima Press Industry Co Ltd | Helmholtz resonator |
| EP2541034A1 (en) * | 2011-06-28 | 2013-01-02 | Röchling Automotive AG & Co. KG | Motor vehicle ventilation channel with dampened Helmholtz resonator |
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|---|---|
| JP6187301B2 (en) | 2017-08-30 |
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