JP5872536B2 - Air intake duct - Google Patents

Air intake duct Download PDF

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Publication number
JP5872536B2
JP5872536B2 JP2013501112A JP2013501112A JP5872536B2 JP 5872536 B2 JP5872536 B2 JP 5872536B2 JP 2013501112 A JP2013501112 A JP 2013501112A JP 2013501112 A JP2013501112 A JP 2013501112A JP 5872536 B2 JP5872536 B2 JP 5872536B2
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intake duct
protrusion
tuning hole
air
air intake
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JPWO2012115178A1 (en
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高行 市川
高行 市川
扇智子 小池
扇智子 小池
青山　達也
達也 青山
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Roki Co Ltd
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Roki Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/02—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
    • F02B27/0226—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means characterised by the means generating the charging effect
    • F02B27/0242—Fluid communication passages between intake ducts, runners or chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/02—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
    • F02B27/0205—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means characterised by the charging effect
    • F02B27/021—Resonance charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B27/00—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues
    • F02B27/02—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means
    • F02B27/0226—Use of kinetic or wave energy of charge in induction systems, or of combustion residues in exhaust systems, for improving quantity of charge or for increasing removal of combustion residues the systems having variable, i.e. adjustable, cross-sectional areas, chambers of variable volume, or like variable means characterised by the means generating the charging effect
    • F02B27/0247—Plenum chambers; Resonance chambers or resonance pipes
    • F02B27/0263—Plenum chambers; Resonance chambers or resonance pipes the plenum chamber and at least one of the intake ducts having a common wall, and the intake ducts wrap partially around the plenum chamber, i.e. snail-type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
    • F02M35/10026—Plenum chambers
    • F02M35/10065—Valves arranged in the plenum chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
    • F02M35/10118—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements with variable cross-sections of intake ducts along their length; Venturis; Diffusers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)

Description

本発明は、吸気ダクトに係り、特に、車両用内燃機関へ外気を導入するために、エアクリーナの上流側に設置される吸気ダクトに関する。   The present invention relates to an intake duct, and more particularly to an intake duct installed upstream of an air cleaner in order to introduce outside air into a vehicle internal combustion engine.

従来、内燃機関用の吸気ダクトとして、内燃機関の吸気音等の騒音を抑制しようとする要望が多く、下記特許文献に記載されているように、内燃機関の吸気音を抑制するための対策として、管壁にチューニングホールと呼ばれる大気連通孔を穿孔したものが知られている。   Conventionally, as an intake duct for an internal combustion engine, there are many requests to suppress noise such as intake sound of the internal combustion engine, and as described in the following patent document, as a measure for suppressing intake noise of the internal combustion engine It is known that an air communication hole called a tuning hole is drilled in a tube wall.

実開平１−９５５６６号公報Japanese Utility Model Publication No. 1-95566

特許文献１に記載された吸気ダクトは、エアクリーナに外気を導入する吸気管中央の管壁に一定径の消音用通孔を設けるとともに、該消音用通孔と上記吸気管の外気導入用開口との間の中央の管壁に新たな消音用通孔を設け、順次新たな消音用通孔と上記開口との間の中央の管壁にさらに新たな消音用通孔を設けて、上記吸気管に少なくとも二個以上の消音用通孔を設けている。   The intake duct described in Patent Document 1 is provided with a silencer through-hole having a constant diameter in the central wall of the intake pipe for introducing outside air into the air cleaner, and the silencer through-hole and an outside air introduction opening of the intake pipe. A new silencing through hole is provided in the central tube wall between the two, and a new silencing through hole is sequentially provided in the central tube wall between the new silencing through hole and the opening. At least two or more silencing holes are provided in the case.

このように特許文献１に記載された吸気ダクトは、管壁にチューニングホールとしての消音用通孔を穿孔することで、吸気音を抑制することができるので、簡単な構成で吸気音を抑制することができる。   As described above, the intake duct described in Patent Document 1 can suppress the intake sound by drilling the silencer through-hole as a tuning hole in the tube wall, and thus suppress the intake sound with a simple configuration. be able to.

上述した従来の吸気ダクトの構成によると、特許文献１に記載された吸気ダクトは、チューニングホールが大気連通孔であるため、大気中のダストや車輪によって跳ね上げられた水がチューニングホールから吸気ダクト内に侵入し、エアクリーナのフィルタエレメントを損傷したり、フィルタエレメントの交換サイクルを長く設定できないといった問題があった。また、チューニングホールから外気が吸い込まれることによる気流音が生じたり、管壁にチューニングホールが穿孔されていることから、内燃機関で生じた脈動音がチューニングホールから放射され、その放射音も大きくなるといった問題もあった。   According to the configuration of the conventional air intake duct described above, the air intake duct described in Patent Document 1 has a tuning hole that is an air communication hole. There are problems that the filter element of the air cleaner is damaged and the replacement cycle of the filter element cannot be set for a long time. In addition, airflow noise is generated due to outside air being sucked in from the tuning hole, and because the tuning hole is drilled in the tube wall, the pulsation sound generated in the internal combustion engine is radiated from the tuning hole, and the radiated sound also increases. There was also a problem.

そこで、本発明は上記問題に鑑みてなされたものであり、簡便な構成でチューニングホールからの水やダストなどの異物の侵入を防止することができ、チューニングホールから外気が吸い込まれることによる気流音の発生を抑制し、内燃機関で生じた脈動音の放射音を小さくすることができる吸気ダクトを提供することを目的とする。   Accordingly, the present invention has been made in view of the above problems, and can prevent foreign matter such as water and dust from entering from the tuning hole with a simple configuration, and airflow sound caused by outside air being sucked from the tuning hole. It is an object of the present invention to provide an intake duct that can suppress the generation of pulsating noise and reduce the radiated sound of pulsating noise generated in an internal combustion engine.

本発明に係る吸気ダクトは、一端がエアクリーナに接続され、他端に外気を導入する開口部を有する筒状に形成されるとともに、壁部に内部と外部とを連通するチューニングホールを備える吸気ダクトにおいて、前記吸気ダクトは、前記壁部の内壁面の底面から対向する天面に向けて突出する突部を備え、前記チューニングホールは、前記突部の先端に形成されていることを特徴とする。   An intake duct according to the present invention is formed in a cylindrical shape having one end connected to an air cleaner and the other end having an opening for introducing outside air, and a wall having a tuning hole that communicates the inside and the outside. The air intake duct includes a protrusion that protrudes from the bottom surface of the inner wall surface of the wall portion toward the opposite top surface, and the tuning hole is formed at a tip of the protrusion. .

また、本発明に係る吸気ダクトにおいて、前記突部の先端は、前記天面から所定の間隔を有していると好適である。   In the intake duct according to the present invention, it is preferable that the tip of the protrusion has a predetermined distance from the top surface.

また、本発明に係る吸気ダクトにおいて、前記間隔は、前記吸気ダクトの延設方向と直交する断面における前記チューニングホールの開口距離以上であると好適である。   In the intake duct according to the present invention, it is preferable that the interval is equal to or greater than an opening distance of the tuning hole in a cross section orthogonal to the extending direction of the intake duct.

また、本発明に係る吸気ダクトにおいて、前記突部は、前記天面に溶着される補強部を備えると好適である。   Moreover, the air intake duct which concerns on this invention WHEREIN: It is suitable for the said protrusion to be provided with the reinforcement part welded to the said top | upper surface.

また、本発明に係る吸気ダクトにおいて、前記突部は、整流板として形成されていると好適である。   In the intake duct according to the present invention, it is preferable that the protrusion is formed as a current plate.

また、本発明に係る吸気ダクトにおいて、前記突部は、補強リブとして形成されていると好適である。   In the intake duct according to the present invention, it is preferable that the protrusion is formed as a reinforcing rib.

上記発明の概要は、本発明の必要な特徴の全てを列挙したものではなく、これらの特徴群のサブコンビネーションもまた発明となり得る。   The above summary of the invention does not enumerate all the necessary features of the present invention, and sub-combinations of these features can also be the invention.

本発明に係る吸気ダクトは、チューニングホールが壁部の内壁面の底面から対向する天面に向けて突出する突部の先端に形成されているので、吸気ダクトの外部からダストや水等の異物の侵入を防止することができ、気流音の発生を抑制し、内燃機関で生じた脈動音の放射音を小さくすることができる。   In the intake duct according to the present invention, the tuning hole is formed at the tip of the protruding portion that protrudes from the bottom surface of the inner wall surface of the wall portion toward the opposite top surface, so that foreign matter such as dust and water from the outside of the intake duct. Can be prevented, generation of airflow noise can be suppressed, and radiated sound of pulsating sound generated in the internal combustion engine can be reduced.

また、本発明に係る吸気ダクトは、突部の先端が吸気ダクトの天面から所定の間隔を有し、この間隔が、吸気ダクトの延設方向と直交する断面におけるチューニングホールの開口距離以上に形成されているので、低周波領域の消音効率が向上し、レゾネータなどを併用して全帯域の消音を行うにあたり、レゾネータなどの容積を小さくすることができ、省スペースで消音対策を施すことができる。   In the intake duct according to the present invention, the tip of the protrusion has a predetermined interval from the top surface of the intake duct, and this interval is equal to or greater than the opening distance of the tuning hole in the cross section orthogonal to the extending direction of the intake duct. As a result, the efficiency of noise reduction in the low frequency region is improved, and when using a resonator, etc. to mute the entire band, the volume of the resonator, etc. can be reduced and space-saving measures can be taken. it can.

また、本発明に係る吸気ダクトは、突部が天面に溶着される補強部を備えているので、吸気ダクトの面剛性を高めることができる。   Moreover, since the air intake duct according to the present invention includes the reinforcing portion whose protrusion is welded to the top surface, the surface rigidity of the air intake duct can be increased.

また、本発明に係る吸気ダクトは、突部が整流板として形成されているので、吸気ダクト内を流通する外気の円滑な流通を促進することができ、通気抵抗を低減することができる。   Moreover, since the protrusion is formed as a rectifying plate in the intake duct according to the present invention, it is possible to promote smooth circulation of outside air flowing through the intake duct and reduce ventilation resistance.

また、本発明に係る吸気ダクトは、突部が補強リブとして形成されているので、吸気ダクトの面剛性を高めることができる。   Moreover, since the protrusion is formed as a reinforcing rib in the intake duct according to the present invention, the surface rigidity of the intake duct can be increased.

本実施形態に係る吸気ダクトの概要を説明するための斜視図。The perspective view for demonstrating the outline | summary of the intake duct which concerns on this embodiment. 本実施形態に係る吸気ダクトの構成を説明するための図。The figure for demonstrating the structure of the air intake duct which concerns on this embodiment. 図２におけるＡ−Ａ断面図。AA sectional drawing in FIG. （Ａ）は本実施形態に係る吸気ダクトの断面図、（Ｂ）は従来の吸気ダクトの断面図。(A) is sectional drawing of the intake duct which concerns on this embodiment, (B) is sectional drawing of the conventional intake duct. 本実施形態に係る吸気ダクトと従来の吸気ダクトの消音量を比較したグラフ。The graph which compared the silence volume of the air intake duct which concerns on this embodiment, and the conventional air intake duct. チューニングホールから天面までの間隔とチューニングホールの開口距離との関係と消音量を比較したグラフ。A graph comparing the relationship between the distance from the tuning hole to the top surface and the opening distance of the tuning hole, and the volume level.

以下、本発明を実施するための好適な実施形態について、図面を用いて説明する。なお、以下の実施形態は、各請求項に係る発明を限定するものではなく、また、実施形態の中で説明されている特徴の組み合わせの全てが発明の解決手段に必須であるとは限らない。   DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. .

図１は、本実施形態に係る吸気ダクトの概要を説明するための斜視図であり、図２は、本実施形態に係る吸気ダクトの構成を説明するための図であり、図３は、図２におけるＡ−Ａ断面図であり、図４は、（Ａ）は本実施形態に係る吸気ダクトの断面図、（Ｂ）は従来の吸気ダクトの断面図であり、図５は、本実施形態に係る吸気ダクトと従来の吸気ダクトの消音量を比較したグラフであり、図６は、チューニングホールから天面までの間隔とチューニングホールの開口距離との関係と消音量を比較したグラフである。   FIG. 1 is a perspective view for explaining the outline of the intake duct according to the present embodiment, FIG. 2 is a view for explaining the configuration of the intake duct according to the present embodiment, and FIG. 4 is a cross-sectional view taken along the line AA in FIG. 4, FIG. 4A is a cross-sectional view of the intake duct according to the present embodiment, FIG. 4B is a cross-sectional view of a conventional intake duct, and FIG. FIG. 6 is a graph comparing the relationship between the distance from the tuning hole to the top surface and the opening distance of the tuning hole, and the noise reduction volume.

図１に示すように、本実施形態に係る吸気ダクト１０は、筒状部材を半割に分割したケース１２ａとカバー１３ａの開口部を互いに組み合わせて筒状に形成されており、一端がエアクリーナに接続されるとともに、他端に外気を導入する開口部１１が形成されている。吸気ダクト１０は、エアクリーナの接続側は略円筒状の円筒部１５が形成されており、開口部１１側は、前記円筒部１５から水平方向に広がるように略扇状の拡口部１６が形成されている。   As shown in FIG. 1, the intake duct 10 according to the present embodiment is formed in a cylindrical shape by combining the openings of a case 12a and a cover 13a obtained by dividing a cylindrical member in half, and one end thereof is an air cleaner. While being connected, an opening 11 for introducing outside air is formed at the other end. The intake duct 10 has a substantially cylindrical cylindrical portion 15 formed on the connection side of the air cleaner, and a substantially fan-shaped opening 16 formed on the opening 11 side so as to spread from the cylindrical portion 15 in the horizontal direction. ing.

ケース１２ａとカバー１３ａは、係止手段１４によって互いに組み合わされている。係止手段１４は、ケース１２ａ又はカバー１３ａのいずれか一方に形成した凹部とケース１２ａ又はカバー１３ａのいずれか他方に形成した凸部とが係合する凹凸係合を構成している。なお、ケース１２ａ及びカバー１３ａは、合成樹脂によって形成されており、具体的には、夫々ポリプロピレン系樹脂やポリアミド系樹脂等の熱可塑性の合成樹脂が好適に用いられる。   The case 12a and the cover 13a are combined with each other by the locking means 14. The locking means 14 constitutes a concave-convex engagement in which a concave portion formed in one of the case 12a and the cover 13a and a convex portion formed in either the case 12a or the cover 13a are engaged. Note that the case 12a and the cover 13a are made of a synthetic resin, and specifically, a thermoplastic synthetic resin such as a polypropylene resin or a polyamide resin is preferably used.

図２に示すように、ケース１２ａの内壁面は、底面１２が形成されており、カバー１３ａの内壁面は、該底面１２と対向する天面１３が形成されている。底面１２には、天面１３に向けて突出する突部２０が形成されており、突部２０の先端にはチューニングホール２１が穿孔され、該チューニングホール２１によって、吸気ダクト１０の内部と外部とが連通されている。突部２０は開口部１１から導入される外気の通気方向に沿って形成されており、外気導入の際の整流板として作用する。   As shown in FIG. 2, the bottom surface 12 is formed on the inner wall surface of the case 12 a, and the top surface 13 that faces the bottom surface 12 is formed on the inner wall surface of the cover 13 a. The bottom surface 12 is formed with a protrusion 20 that protrudes toward the top surface 13, and a tuning hole 21 is perforated at the tip of the protrusion 20. Is communicated. The protrusion 20 is formed along the direction of the outside air introduced from the opening 11 and functions as a current plate when the outside air is introduced.

図３に示すように、チューニングホール２１は、突部２０の長手方向に沿った長孔形状に形成されている。このように、チューニングホール２１を突部２０の先端に形成したことにより、ケース１２ａの外面には、溝部１７が形成されており、チューニングホール２１は、吸気ダクト１０の外面から見た場合、この溝部１７の最深部に形成されている。   As shown in FIG. 3, the tuning hole 21 is formed in a long hole shape along the longitudinal direction of the protrusion 20. Thus, by forming the tuning hole 21 at the tip of the protrusion 20, the groove portion 17 is formed on the outer surface of the case 12 a. When the tuning hole 21 is viewed from the outer surface of the intake duct 10, It is formed in the deepest part of the groove part 17.

また、突部２０には、天面１３に溶着される補強部２２，２２が形成されている。この補強部２２，２２によって、底面１２と天面１３とが互いに溶着され、吸気ダクト１０の面剛性が向上している。なお、補強部２２，２２と天面１３とは、振動溶着、超音波溶着等種々の溶着方法によって溶着されている。   In addition, the protrusion 20 is formed with reinforcing portions 22 and 22 that are welded to the top surface 13. By the reinforcing portions 22 and 22, the bottom surface 12 and the top surface 13 are welded to each other, and the surface rigidity of the intake duct 10 is improved. The reinforcing portions 22 and 22 and the top surface 13 are welded by various welding methods such as vibration welding and ultrasonic welding.

図４に示すように、チューニングホール２１と天面１３とは、所定の間隔Ｙを有して形成されている。この間隔Ｙは、チューニングホール２１における吸気ダクト１０の延設方向と直交する断面における開口距離Ｘ以上に形成されている。   As shown in FIG. 4, the tuning hole 21 and the top surface 13 are formed with a predetermined interval Y. This interval Y is formed to be equal to or longer than the opening distance X in the cross section orthogonal to the extending direction of the intake duct 10 in the tuning hole 21.

図５は、本実施形態に係る吸気ダクトと、従来のチューニングホールが形成された吸気ダクト（比較例１）及びチューニングホールが形成されていない吸気ダクト（比較例２）の周波数と消音量の解析結果である。   FIG. 5 shows an analysis of the frequency and noise reduction of the intake duct according to the present embodiment, a conventional intake duct having a tuning hole (Comparative Example 1), and an intake duct having no tuning hole (Comparative Example 2). It is a result.

図５から明らかなように、本実施形態に係る吸気ダクトは、従来のチューニングホールが形成された吸気ダクトと同様に、チューニングホールが形成されていない吸気ダクトに比べて全ての周波数帯において、消音量が大きくなっていることが確認できた。なお、図５において縦軸は消音量を表し、数値が大きいほど消音効果が高いことを示している。   As is clear from FIG. 5, the air intake duct according to the present embodiment is muffled in all frequency bands compared to the air intake duct having no tuning hole, as in the case of the air intake duct having the conventional tuning hole formed. It was confirmed that the amount increased. In FIG. 5, the vertical axis represents the muffled volume, and the larger the value, the higher the muffling effect.

次に、図６を参照して、間隔Ｙと開口距離Ｘとの関係が消音量に与える影響について解析した結果について説明を行う。なお、図６においても図５と同様に縦軸は消音量を表し、数値が大きいほど消音効果が高いことを示している。   Next, with reference to FIG. 6, the result of analyzing the influence of the relationship between the interval Y and the opening distance X on the muffling volume will be described. In FIG. 6, as in FIG. 5, the vertical axis represents the mute level, and the larger the value, the higher the mute effect.

図６のグラフは、チューニングホールが形成されていない吸気ダクト（比較例３）、チューニングホールを突部に形成し、間隔Ｙを５ｍｍに形成した吸気ダクト（実施例２）、間隔Ｙを１０ｍｍに形成した吸気ダクト（実施例３）、間隔Ｙを２０ｍｍに形成した吸気ダクト（実施例４）、間隔Ｙを３０ｍｍに形成した吸気ダクト（実施例５）の周波数と消音量を比較したデータである。なお、チューニングホールの開口距離Ｘは全て２０ｍｍに形成した。   The graph of FIG. 6 shows an intake duct (Comparative Example 3) in which no tuning hole is formed, an intake duct (Example 2) in which a tuning hole is formed in a protrusion, and the interval Y is 5 mm, and the interval Y is 10 mm. This is a data comparing the frequency of the intake duct formed (Example 3), the intake duct formed with an interval Y of 20 mm (Example 4), and the intake duct formed with an interval Y of 30 mm (Example 5) and the noise reduction volume. . Note that the opening distances X of the tuning holes were all 20 mm.

図６から明らかなように、本実施形態に係る吸気ダクトは、チューンニングホールが形成されていない従来の吸気ダクト（比較例３）よりも消音量が大きく、より低い周波数帯の消音が可能であることを示している。一般的に低周波数帯域の消音を行う場合、レゾネータなどの消音器の容積が大きくなってしまい、低周波数帯域の消音は省スペースで対策を行うことが難しい。本実施形態に係る吸気ダクトは、低周波数帯域の消音量が大きいので、レゾネータなども併用して全帯域での消音効率を考えた場合、従来の吸気ダクトに比べてより省スペースで消音対策を行うことが可能となる。   As is clear from FIG. 6, the intake duct according to the present embodiment has a louder volume than the conventional intake duct (Comparative Example 3) in which no tuning hole is formed, and can mute a lower frequency band. It shows that there is. In general, when performing silencing in a low frequency band, the volume of a silencer such as a resonator becomes large, and it is difficult to take measures for the silencing in the low frequency band in a space-saving manner. The air intake duct according to the present embodiment has a large sound deadening volume in the low frequency band, so when considering the sound silencing efficiency in the entire band in combination with a resonator or the like, more space-saving muffler measures can be taken compared to the conventional air intake duct. Can be done.

また、図６から明らかなように、突部にチューニングホールを形成した場合、間隔Ｙが小さくなるに従って、低周波数の消音量が小さくなっていることが確認できた。消音量と周波数帯域の関係とを考慮すると、実施例４および実施例５の解析結果が示すように、開口距離Ｘと間隔Ｙとの関係は、間隔Ｙが開口距離Ｘ以上に形成することが好ましい。   Further, as apparent from FIG. 6, it was confirmed that when the tuning hole was formed in the protrusion, the low-frequency silence volume was reduced as the interval Y was reduced. Considering the relationship between the noise reduction volume and the frequency band, as shown in the analysis results of Example 4 and Example 5, the relationship between the opening distance X and the interval Y may be such that the interval Y is greater than or equal to the opening distance X. preferable.

このように、本実施形態に係る吸気ダクト１０は、溝部１７の最深部にチューニングホール２１が形成されているので、大気中のダストや車輪によって跳ね上げられた水がチューニングホール２１から吸気ダクト１０内へ侵入することを防止できる。   As described above, in the intake duct 10 according to the present embodiment, the tuning hole 21 is formed in the deepest portion of the groove portion 17, so that dust that has been splashed by air or water splashed by the wheels from the tuning hole 21 to the intake duct 10. Intrusion can be prevented.

また、溝部１７の最深部にチューニングホール２１が形成されているので、チューニングホール２１を介して吸気ダクト１０の外部から内部に外気が入り込みづらい構成となっており、外気の吸入によって生じる気流音を抑制することができる。   Further, since the tuning hole 21 is formed in the deepest portion of the groove portion 17, it is difficult for outside air to enter from the outside of the intake duct 10 through the tuning hole 21, and airflow sound generated by inhalation of outside air is generated. Can be suppressed.

さらに、図４（Ａ）に示すように、内燃機関で生じた脈動音の放射音が生じた場合でも、溝部１７の最深部にチューニングホール２１が形成されていることにより、放射音の測定点Ｍからチューニングホール２１までの測定距離Ｌが、図４（Ｂ）に示すように、従来の吸気ダクトのように、吸気ダクトの管壁にチューニングホールを穿孔した場合の測定距離Ｌ´に比べて大きくすることができ、放射音を低減することができる。   Furthermore, as shown in FIG. 4 (A), even when pulsating radiated sound generated in the internal combustion engine is generated, the tuning hole 21 is formed in the deepest portion of the groove portion 17 so that the radiated sound measurement point is obtained. As shown in FIG. 4 (B), the measurement distance L from M to the tuning hole 21 is compared with the measurement distance L ′ when a tuning hole is drilled in the pipe wall of the intake duct as in the conventional intake duct. The size can be increased, and the radiated sound can be reduced.

以上説明したように、本実施形態に係る吸気ダクト１０では、突部２０を整流板として形成した場合について説明したが、突部２０は、リブを複数配置した形態に形成しても構わない。リブの数は求められる吸気ダクトの面剛性に応じて適宜変更することができる。また、本実施形態に係る吸気ダクト１０では、ケース１２ａとカバー１３ａとを係止手段１４によって係合した場合について説明したが、ケース１２ａとカバー１３ａはそれぞれ
溶着によって組み合わせても良いし、ケース１２ａとカバー１３ａとを樹脂成型によって一体に形成しても構わない。その様な変更又は改良を加えた形態も本発明の技術的範囲に含まれうることが、特許請求の範囲の記載から明らかである。As described above, in the intake duct 10 according to the present embodiment, the case where the protrusion 20 is formed as a current plate has been described, but the protrusion 20 may be formed in a form in which a plurality of ribs are arranged. The number of ribs can be appropriately changed according to the required surface rigidity of the intake duct. Further, in the intake duct 10 according to the present embodiment, the case where the case 12a and the cover 13a are engaged by the locking means 14 has been described. However, the case 12a and the cover 13a may be combined by welding, or the case 12a. And the cover 13a may be integrally formed by resin molding. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

１０ 吸気ダクト， １１ 開口部， １２ 底面， １２ａ ケース， １３ 天面， カバー １３ａ， １４ 係止手段， １５ 円筒部， １６ 拡口部， １７ 溝部， ２０ 突部， ２１ チューニングホール， ２２ 補強部， Ｘ 開口距離， Ｙ 間隔， Ｌ，Ｌ´ 測定距離， Ｍ 測定点。   DESCRIPTION OF SYMBOLS 10 Intake duct, 11 Opening part, 12 Bottom surface, 12a Case, 13 Top surface, Cover 13a, 14 Locking means, 15 Cylindrical part, 16 Widening part, 17 Groove part, 20 Protrusion part, 21 Tuning hole, 22 Reinforcement part, X opening distance, Y interval, L, L 'measuring distance, M measuring point.

Claims (6)

一端がエアクリーナに接続され、他端に外気を導入する開口部を有する筒状に形成されるとともに、壁部に内部と外部とを連通するチューニングホールを備える吸気ダクトにおいて、
前記吸気ダクトは、前記壁部の内壁面の底面から対向する天面に向けて突出する突部を備え、
前記チューニングホールは、前記突部の先端に形成されていることを特徴とする吸気ダクト。In the intake duct having one end connected to the air cleaner and the other end formed into a cylindrical shape having an opening for introducing outside air, and having a tuning hole communicating the inside and the outside in the wall portion,
The intake duct includes a protrusion that protrudes from the bottom surface of the inner wall surface of the wall portion toward the opposite top surface;
The air intake duct, wherein the tuning hole is formed at a tip of the protrusion. 請求項１に記載の吸気ダクトにおいて、
前記突部の先端は、前記天面から所定の間隔を有していることを特徴とする吸気ダクト。Intake duct according to claim 1,
An air intake duct, wherein a tip of the protrusion has a predetermined distance from the top surface. 請求項２に記載の吸気ダクトにおいて、
前記間隔は、前記吸気ダクトの延設方向と直交する断面における前記チューニングホールの開口距離以上であることを特徴とする吸気ダクト。The intake duct according to claim 2,
The air intake duct according to claim 1, wherein the interval is equal to or greater than an opening distance of the tuning hole in a cross section perpendicular to the extending direction of the air intake duct. 請求項１から３のいずれか１項に記載の吸気ダクトにおいて、
前記突部は、前記天面に溶着される補強部を備えることを特徴とする吸気ダクト。The intake duct according to any one of claims 1 to 3,
The air intake duct according to claim 1, wherein the protrusion includes a reinforcing portion welded to the top surface. 請求項１から４のいずれか１項に記載の吸気ダクトにおいて、
前記突部は、整流板として形成されていることを特徴とする吸気ダクト。The intake duct according to any one of claims 1 to 4,
The air intake duct according to claim 1, wherein the protrusion is formed as a current plate. 請求項１から４のいずれか１項に記載の吸気ダクトにおいて、
前記突部は、補強リブとして形成されていることを特徴とする吸気ダクト。The intake duct according to any one of claims 1 to 4,
The air intake duct according to claim 1, wherein the protrusion is formed as a reinforcing rib.
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JP6413782B2 (en) * 2015-01-19 2018-10-31 スズキ株式会社 Engine intake system
JP6434612B2 (en) * 2015-03-11 2018-12-05 本田技研工業株式会社 Motorcycle air cleaner equipment
JP6908505B2 (en) * 2017-11-27 2021-07-28 トヨタ自動車株式会社 Resin radiator support duct
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