JP2012167597A - Suction duct connecting structure and air cleaner device - Google Patents

Suction duct connecting structure and air cleaner device Download PDF

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JP2012167597A
JP2012167597A JP2011028938A JP2011028938A JP2012167597A JP 2012167597 A JP2012167597 A JP 2012167597A JP 2011028938 A JP2011028938 A JP 2011028938A JP 2011028938 A JP2011028938 A JP 2011028938A JP 2012167597 A JP2012167597 A JP 2012167597A
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intake duct
stage
air cleaner
intake
flow
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JP5648521B2 (en
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Akio Nakagawa
紹夫 中川
Isao Goto
功 後藤
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Toyota Motor Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a suction duct connecting structure that is connectable to any one of suction ducts having different connection opening diameters by using only one air cleaner and capable of working well complying with their respective required performances, and an air cleaner device thereof.SOLUTION: The influx port 4a of the air cleaner 2 has a flow passage whose cross-sectional area enlarges in eccentricity toward one side from the second stage 8 to the first stage 6 more in the upstream of the suction flow. In the case of a suction duct 14 having a smaller connection opening diameter, connection is made to the influx port 4a of the air cleaner 2 at the second stage 8 in downstream while the first stage 6 upstream is skipped, which allows introducing the suction air to the air cleaner 2 externally, and the smaller connection opening diameter assures saving the space and reducing the noise. In the case of a suction duct 12 having a larger connection opening diameter, connection is made to the influx port 4a at the first stage 6 in upstream, but the flow passage sectional area decreases at the second stage 8 downstream of the connection. However, because the level difference 8a lies inside the curvature of a curved suction duct 12, the suction flow is not largely influenced by the dead space 16, and it is possible to secure sufficiently a large quantity of suction flow.

Description

本発明は、接続部に接続した吸気ダクトを介して内燃機関用の吸気を導入するエアクリーナにおける吸気ダクト接続構造及びエアクリーナ装置に関する。   The present invention relates to an intake duct connection structure and an air cleaner apparatus in an air cleaner that introduces intake air for an internal combustion engine through an intake duct connected to a connection portion.

吸気ダクト(外気ダクトとも言う)を介して内燃機関用の吸気を導入するエアクリーナが知られている(例えば特許文献1,2参照)。
特許文献1では、外気ダクトとエアクリーナとを接続する場合に十分な吸入空気量と高い気流音の消音効果とを実現するために、エアクリーナ内に突出している外気ダクトの下流側開口端を、近傍の外気ダクトの軸心に直交する平面に対し所定の角度を持たせて、拡張比を拡大している。
There is known an air cleaner that introduces intake air for an internal combustion engine via an intake duct (also referred to as an outside air duct) (see, for example, Patent Documents 1 and 2).
In Patent Document 1, in order to achieve a sufficient intake air amount and a high noise reduction effect when connecting an outside air duct and an air cleaner, the downstream opening end of the outside air duct protruding into the air cleaner is located near The expansion ratio is increased by giving a predetermined angle to a plane perpendicular to the axis of the outside air duct.

特許文献2では、吸気量が少ないときの吸気ノイズを小さくするために、吸気ダクトの通路断面積を可変としている。   In Patent Document 2, in order to reduce intake noise when the intake air amount is small, the passage cross-sectional area of the intake duct is variable.

特開2006−125373号公報(第6〜7頁、図7)JP 2006-125373 A (pages 6-7, FIG. 7) 特開2003−74426号公報(第3頁、図3)JP 2003-74426 A (page 3, FIG. 3)

このようなエアクリーナを共通化して各種内燃機関に適用することが検討されている。しかし内燃機関によっては、十分な流量の吸気を要求するものと、吸気量を抑制しても省スペースや騒音低減を優先したいものが存在する。   It has been studied to apply such an air cleaner in common to various internal combustion engines. However, some internal combustion engines require intake with a sufficient flow rate and others want to prioritize space saving and noise reduction even when the intake amount is suppressed.

このためエアクリーナに接続する吸気ダクトにおいても接続開口径の大きいものと小さいものとが存在する。したがって1つのエアクリーナでは十分に対処できず共通化が困難である。   For this reason, the intake duct connected to the air cleaner also has a large connection opening diameter and a small connection opening diameter. Therefore, it is difficult to use a single air cleaner, and it is difficult to make it common.

本発明は、1つのエアクリーナにて接続開口径の異なる吸気ダクトに接続可能で、それぞれの要求性能に対応できる吸気ダクト接続構造及びエアクリーナ装置を目的とするものである。   An object of the present invention is to provide an intake duct connection structure and an air cleaner device that can be connected to intake ducts having different connection opening diameters with a single air cleaner, and that can meet the required performance.

以下、上記目的を達成するための手段及びその作用・効果について記載する。
請求項1に記載の吸気ダクト接続構造は、接続部に接続した吸気ダクトを介して内燃機関用の吸気を導入するエアクリーナにおける吸気ダクト接続構造であって、前記接続部は、同一の流入口に、流路断面積が異なる複数段を吸気流方向に配列して形成していると共に、吸気流の上流に行くほど、流路形状が一方側に偏って拡大されることで各段の流路断面積に差が設けられていることを特徴とする。
In the following, means for achieving the above-mentioned purpose, and its operation and effect are described.
The intake duct connection structure according to claim 1 is an intake duct connection structure in an air cleaner that introduces intake air for an internal combustion engine through an intake duct connected to a connection portion, and the connection portion is connected to the same inlet port. A plurality of stages having different flow path cross-sectional areas are arranged in the intake flow direction, and the flow path shape is biased and enlarged toward one side toward the upstream side of the intake flow, so that the flow path of each stage A difference is provided in the cross-sectional area.

エアクリーナにおいて、同一の流入口には、吸気流方向に配列して、流路断面積が異なる複数段が形成されている。この複数段は、吸気流の上流に行くほど、その流路形状は一方側に偏って拡大されて、このことにより流路断面積に差が設けられている。   In the air cleaner, a plurality of stages with different flow path cross-sectional areas are formed at the same inlet in the intake flow direction. As the upstream of the plurality of stages goes upstream of the intake air flow, the shape of the flow path is deviated toward one side, and a difference is provided in the cross-sectional area of the flow path.

すなわち吸気流の上流に行くほど、段の流路断面積は拡大されていることにより、各段の位置で、接続開口径の異なる各種の吸気ダクトを接続できる。
接続開口径の小さい吸気ダクトの場合には、上流側の段を通過させて下流側の段の位置にてエアクリーナの流入口に接続することができ、このことにより、外部からエアクリーナ内部に吸気を導入することができると共に、接続開口径が小さいために省スペースや騒音低減効果が高くなる。
In other words, the flow passage cross-sectional area of the stage is increased toward the upstream side of the intake flow, so that various intake ducts having different connection opening diameters can be connected at each stage position.
In the case of an intake duct having a small connection opening diameter, it is possible to pass through the upstream stage and connect it to the inlet of the air cleaner at the downstream stage position. In addition to being able to be introduced, since the connection opening diameter is small, the space saving and noise reduction effects are enhanced.

接続開口径の大きい吸気ダクトの場合には、上流側の段の位置にてエアクリーナの流入口に接続することにより、外部からエアクリーナ内部に吸気を導入することができる。
ところがこのように接続開口径の大きい吸気ダクトを上流側の段の位置にてエアクリーナの流入口に接続しても、その下流側の段の位置では流路断面積が小さくなってしまう。
In the case of an intake duct having a large connection opening diameter, intake air can be introduced from the outside into the air cleaner by connecting to the inlet of the air cleaner at the upstream stage position.
However, even if the intake duct having such a large connection opening diameter is connected to the inlet of the air cleaner at the upstream stage position, the flow passage cross-sectional area becomes small at the downstream stage position.

しかし本吸気ダクト接続構造では、上流側での段の流路断面積拡大は、単に流路断面積が拡大しているのではなく、その流路形状が、一方側に偏って拡大されることにより実現されている。   However, in this intake duct connection structure, the channel cross-sectional area of the stage on the upstream side does not simply increase the cross-sectional area of the channel, but the shape of the flow channel is biased toward one side. It is realized by.

このため接続開口径の大きい吸気ダクトとして、湾曲した吸気ダクトを用いて、その湾曲内側を流路形状の拡大側にして上流側の段の位置に接続すると、上流側の段から見て、下流側の段では、吸気ダクトの湾曲内側にて径が小さくされている状態となる。   For this reason, if a curved intake duct is used as an intake duct having a large connection opening diameter and the curved inner side is connected to the position of the upstream stage with the enlarged side of the flow path shape, the downstream side is viewed from the upstream stage. In the step on the side, the diameter is reduced on the curved inner side of the intake duct.

湾曲した吸気ダクトを流れる吸気は、流路内部において湾曲内側が剥離しやすく、湾曲外側での吸気流が主流となる。このため湾曲内側はデッドスペースが生じて、吸気量に対する寄与は少なくなる。したがって上流側の段から見て、下流側の段にて吸気ダクトの湾曲内側で径が小さくされていても、吸気流量には大きな影響はないことになる。   As for the intake air flowing through the curved intake duct, the inside of the curve is easily separated inside the flow path, and the intake air flow outside the curve becomes the mainstream. For this reason, a dead space is generated inside the curve, and the contribution to the intake air amount is reduced. Therefore, even if the diameter is reduced on the curved inner side of the intake duct in the downstream stage as viewed from the upstream stage, the intake flow rate is not greatly affected.

このことにより上流側の段に接続開口径の大きい吸気ダクトを接続した場合に、湾曲した吸気ダクトであれば、エアクリーナ内に大量の吸気を導入できることになる。
このように本発明の吸気ダクト接続構造は、1つのエアクリーナにて接続開口径の異なる吸気ダクトに接続可能で、それぞれの要求性能に対応できるものとなる。
As a result, when an intake duct having a large connection opening diameter is connected to the upstream stage, if the intake duct is curved, a large amount of intake air can be introduced into the air cleaner.
As described above, the intake duct connection structure of the present invention can be connected to intake ducts having different connection opening diameters by one air cleaner, and can correspond to each required performance.

請求項2に記載の吸気ダクト接続構造では、請求項1に記載の吸気ダクト接続構造において、前記接続部は2段に形成されていることを特徴とする。
このように段は2段として大小2つの流路断面積にて省スペースや騒音低減と大量吸気量確保とのそれぞれに対して十分に対応可能である。
The intake duct connection structure according to claim 2 is characterized in that in the intake duct connection structure according to claim 1, the connection portion is formed in two stages.
In this way, two stages are sufficient to cope with space saving, noise reduction, and securing a large amount of intake air with two large and small flow passage cross-sectional areas.

請求項3に記載の吸気ダクト接続構造では、請求項2に記載の吸気ダクト接続構造において、前記接続部の2段は前記流路形状の拡大側とは反対側が内周面を共通化していることを特徴とする。   In the intake duct connection structure according to claim 3, in the intake duct connection structure according to claim 2, the two stages of the connection portion share a common inner peripheral surface on the side opposite to the enlarged side of the flow path shape. It is characterized by that.

このことにより拡大側とは反対側において吸気ダクト接続構造を短くでき、エアクリーナの小型化に貢献できる。
請求項4に記載の吸気ダクト接続構造では、請求項3に記載の吸気ダクト接続構造において、前記接続部の2段のうち、大径側の段は流路に直交状態に形成され、小径側の段は流路に斜めに形成されていることで、前記反対側の内周面が共通化されていることを特徴とする。
As a result, the intake duct connection structure can be shortened on the side opposite to the enlarged side, which contributes to the downsizing of the air cleaner.
The intake duct connection structure according to claim 4, wherein, in the intake duct connection structure according to claim 3, of the two stages of the connection portion, the large-diameter side stage is formed in a state orthogonal to the flow path, and the small-diameter side The step is formed obliquely in the flow path, so that the inner peripheral surface on the opposite side is shared.

このように大径側の段が流路に直交状態であるのに対して小径側の段は斜めに形成されていることで、拡大側とは反対側の内周面の共通化が可能となる。
請求項5に記載のエアクリーナ装置では、請求項2〜4のいずれか一項に記載の吸気ダクト接続構造を備えたエアクリーナの前記接続部において、吸気流上流側の流路断面積が大きい方の段に、この流路断面積に対応する大径の湾曲状吸気ダクトを、この湾曲状吸気ダクトの湾曲内側を、前記流路形状の拡大側にして接続したことを特徴とする。
In this way, the step on the large diameter side is orthogonal to the flow path, whereas the step on the small diameter side is formed obliquely, so that the inner peripheral surface on the side opposite to the enlargement side can be shared. Become.
In the air cleaner apparatus according to claim 5, in the connection portion of the air cleaner having the intake duct connection structure according to any one of claims 2 to 4, the flow passage cross-sectional area on the upstream side of the intake flow is larger. A large-diameter curved intake duct corresponding to the cross-sectional area of the flow path is connected to the step so that the curved inner side of the curved intake duct is on the enlarged side of the flow path shape.

このように大径の湾曲状吸気ダクトを、前記請求項2〜4のいずれか一項に記載の吸気ダクト接続構造を備えたエアクリーナに対して、その大径の段に接続したエアクリーナ装置は、前記請求項1にて述べたごとく大量の吸気流量を確保することが可能となる。   In this way, an air cleaner device in which a large-diameter curved intake duct is connected to the large-diameter stage with respect to the air cleaner having the intake duct connection structure according to any one of claims 2 to 4, As described in the first aspect, a large amount of intake flow rate can be secured.

このことから1つのエアクリーナにて接続開口径の異なる吸気ダクトに接続可能で、それぞれの要求性能に対応できるエアクリーナ装置を実現できる。
請求項6に記載のエアクリーナ装置では、請求項2〜4のいずれか一項に記載の吸気ダクト接続構造を備えたエアクリーナの前記接続部において、吸気流の下流側の流路断面積が小さい方の段に、この流路断面積に対応する小径の湾曲状吸気ダクトを、この湾曲状吸気ダクトの湾曲内側を前記流路形状の拡大側にして接続したことを特徴とする。
From this, it is possible to realize an air cleaner device that can be connected to intake ducts having different connection opening diameters with a single air cleaner, and that can correspond to each required performance.
In the air cleaner device according to claim 6, in the connection portion of the air cleaner having the intake duct connection structure according to any one of claims 2 to 4, the flow passage cross-sectional area on the downstream side of the intake air flow is smaller In this stage, a small-diameter curved intake duct corresponding to the cross-sectional area of the flow path is connected such that the curved inner side of the curved intake duct is on the enlarged side of the flow path shape.

このように小径の湾曲状吸気ダクトを前記請求項2〜4のいずれか一項に記載の吸気ダクト接続構造を備えたエアクリーナに対して接続して、その小径の段に接続したエアクリーナ装置は、前記請求項1にて述べたごとく省スペースや騒音低減効果を高くできる。   In this way, an air cleaner device connected to an air cleaner having the intake duct connection structure according to any one of claims 2 to 4 connected to the curved inlet duct having a small diameter and connected to the small diameter step, As described in the first aspect, space saving and noise reduction effect can be enhanced.

しかも小径の湾曲状吸気ダクトの湾曲内側が流路形状の拡大側である。すなわち大径の段が拡大している側に、小径の湾曲状吸気ダクトの上流側が湾曲していることになる。
このことから小径の湾曲状吸気ダクトを、大径の段の奥にある小径の段に取り付ける際に、特に小径の湾曲状吸気ダクトの曲率が大きくても大径の段の縁が、小径の湾曲状吸気ダクトに干渉することがない。したがって小径の湾曲状吸気ダクトの曲率が大きくてもエアクリーナ装置の組立が可能になると共に、エアクリーナ装置の小型化に貢献できる。
Moreover, the inside of the curved intake duct having a small diameter is the enlarged side of the flow path shape. That is, the upstream side of the small-diameter curved intake duct is curved on the side where the large-diameter step is enlarged.
For this reason, when attaching a small-diameter curved intake duct to a small-diameter step at the back of the large-diameter step, the edge of the large-diameter step has a small diameter, even if the curvature of the small-diameter curved intake duct is large. It does not interfere with the curved intake duct. Therefore, the air cleaner device can be assembled even if the curvature of the small-diameter curved intake duct is large, and the air cleaner device can be miniaturized.

請求項7に記載のエアクリーナ装置では、請求項6に記載のエアクリーナ装置において、前記湾曲状吸気ダクトは接続側の先端がダクト中心軸に対して斜めに切断されていることにより、接続側開口部がエアクリーナ中心側に向けられていることを特徴とする。   The air cleaner apparatus according to claim 7, wherein the curved intake duct has a connection-side opening portion cut off obliquely with respect to the duct center axis in the curved intake duct. Is directed to the center side of the air cleaner.

特に小径の湾曲状吸気ダクトをエアクリーナに対して接続したエアクリーナ装置において、上述したごとく接続側の先端がダクト中心軸に対して斜めに切断されて、その接続側開口部がエアクリーナ中心側に向けられていると、拡張比を大きくできる。このことにより騒音低減効果をより高くできる。   In particular, in an air cleaner device in which a curved intake duct having a small diameter is connected to an air cleaner, the tip of the connection side is cut obliquely with respect to the duct central axis as described above, and the connection side opening is directed to the air cleaner center side. The expansion ratio can be increased. This can increase the noise reduction effect.

特に前記請求項4のごとく小径側の段も斜めに配置されていれば、小径側の段と小径の湾曲状吸気ダクトの先端との形状が適合するので、エアクリーナ装置の小型化に貢献できる。   In particular, if the step on the small diameter side is also arranged obliquely as in the fourth aspect, the shape of the step on the small diameter side and the tip of the small diameter curved intake duct can be matched, which can contribute to downsizing of the air cleaner device.

実施の形態1のエアクリーナにおける吸気ダクト接続部の俯瞰斜視図。FIG. 3 is an overhead perspective view of an intake duct connecting portion in the air cleaner according to the first embodiment. 実施の形態1のエアクリーナにおける吸気ダクト接続部の仰視斜視図。FIG. 3 is an elevational perspective view of an intake duct connecting portion in the air cleaner according to the first embodiment. 実施の形態1のエアクリーナにおける吸気ダクト接続部の正面図。FIG. 3 is a front view of an intake duct connecting portion in the air cleaner according to the first embodiment. 実施の形態1のエアクリーナにおける吸気ダクト接続部の左側面図。FIG. 3 is a left side view of an intake duct connecting portion in the air cleaner according to the first embodiment. 実施の形態1のエアクリーナにおける吸気ダクト接続部の縦断面図。FIG. 3 is a longitudinal sectional view of an intake duct connecting portion in the air cleaner according to the first embodiment. 実施の形態1のエアクリーナにおける吸気ダクト接続部の縦断斜視図。FIG. 3 is a vertical perspective view of an intake duct connecting portion in the air cleaner according to the first embodiment. (a),(b)実施の形態1のエアクリーナ装置における接続状態を示す縦断面図。(A), (b) The longitudinal cross-sectional view which shows the connection state in the air cleaner apparatus of Embodiment 1. FIG. (a)〜(d)実施の形態2のエアクリーナにおける吸気ダクト接続部、及びエアクリーナ装置における接続状態を示す縦断面図。(A)-(d) The longitudinal cross-sectional view which shows the connection state in the intake duct connection part in the air cleaner of Embodiment 2, and an air cleaner apparatus. (a),(b)他の実施の形態における小径の湾曲状吸気ダクトの形状及びエアクリーナとの接続状態を示す縦断面図。(A), (b) The longitudinal cross-sectional view which shows the connection state with the shape of the curved intake duct with a small diameter in other embodiment, and an air cleaner.

[実施の形態1]
〈構成〉図1〜6は上述した発明が適用されたエアクリーナ2の吸気ダクト接続構造を示すものであり、吸気ダクト接続部4とその周辺の構成を表す。吸気ダクト接続部4は、同一の流入口4aにおいて、流路断面積が異なる複数段、ここでは第1段6と第2段8との2段が、吸気流方向に配列して形成されている。
[Embodiment 1]
<Configuration> FIGS. 1 to 6 show the intake duct connection structure of the air cleaner 2 to which the above-described invention is applied, and show the configuration of the intake duct connection portion 4 and its periphery. The intake duct connection portion 4 is formed by arranging a plurality of stages having different flow path cross-sectional areas at the same inlet 4a, here two stages of a first stage 6 and a second stage 8 arranged in the intake flow direction. Yes.

ここで第2段8がエアクリーナハウジング2a側(吸気流の下流側)に形成され、第2段8の先端に、すなわち吸気流の上流側に第1段6が形成されている。第1段6は第2段8よりも大径に形成されていると共に、第1段6における流路中心と、第2段8における流路中心とは一致しておらず、第1段6は第2段8に対して一方側(図では下側)へずらした状態で形成されている。   Here, the second stage 8 is formed on the air cleaner housing 2a side (the downstream side of the intake flow), and the first stage 6 is formed at the tip of the second stage 8, that is, the upstream side of the intake flow. The first stage 6 is formed to have a larger diameter than the second stage 8, and the flow path center in the first stage 6 and the flow path center in the second stage 8 do not coincide with each other. Is formed in a state shifted to one side (lower side in the figure) with respect to the second stage 8.

すなわち第2段8に対して、その吸気流の上流側で流路形状が一方側に偏って拡大されて第1段6が形成されている。このことで第1段6と第2段8とで流路断面積に差(第1段6の流路断面積>第2段8の流路断面積)が設けられている。   That is, with respect to the second stage 8, the flow path shape is deviated toward one side on the upstream side of the intake flow, and the first stage 6 is formed. Thus, there is a difference in flow path cross-sectional area between the first stage 6 and the second stage 8 (flow path cross-sectional area of the first stage 6> flow path cross-sectional area of the second stage 8).

そして吸気ダクト接続部4のこれら第1段6と第2段8とは、第1段6の拡大側(図では下側)とは反対側では、内周面を共通化した共用面10を形成している。
このように形成されたエアクリーナ2の吸気ダクト接続部4には、図7の(a)、(b)に示すごとく、第1段6の流路断面積に対応する大径の湾曲状吸気ダクト12と、第2段8の流路断面積に対応する小径の湾曲状吸気ダクト14とのいずれかを選択して接続することができる。
The first stage 6 and the second stage 8 of the intake duct connecting portion 4 are provided with a common surface 10 having a common inner peripheral surface on the side opposite to the enlarged side (lower side in the drawing) of the first stage 6. Forming.
As shown in FIGS. 7A and 7B, the intake duct connection portion 4 of the air cleaner 2 formed in this way has a large-diameter curved intake duct corresponding to the cross-sectional area of the first stage 6. 12 and the small-diameter curved intake duct 14 corresponding to the cross-sectional area of the second stage 8 can be selected and connected.

図7の(a)のごとく大径の湾曲状吸気ダクト12を第1段6に接続してエアクリーナ装置AC1を構成する場合には、湾曲状吸気ダクト12の湾曲内側を、吸気ダクト接続部4における流路形状の拡大側にする。   When the air cleaner device AC1 is configured by connecting the large-diameter curved intake duct 12 to the first stage 6 as shown in FIG. 7A, the inside of the curved intake duct 12 is connected to the intake duct connecting portion 4. On the enlarged side of the channel shape.

図7の(b)のごとく小径の湾曲状吸気ダクト14を第2段8に接続してエアクリーナ装置AC2を構成する場合には、湾曲状吸気ダクト14の湾曲内側を、吸気ダクト接続部4における流路形状の拡大側にする。   When the air cleaner device AC2 is configured by connecting the small-diameter curved intake duct 14 to the second stage 8 as shown in FIG. 7B, the curved inner side of the curved intake duct 14 is connected to the intake duct connecting portion 4. Set to the enlarged side of the channel shape.

更に、図7の(a)、(b)において、吸気ダクト接続部4の内周面を構成する共用面10は、第1段6と第2段8とで、吸気ダクト12,14の接続に共通に用いられている。すなわち、大径側の第1段6が吸気流路に直交状態に形成されているが、小径側の第2段8は吸気流路に斜めに形成されている。このことにより共用面10を共通化している。   Further, in FIGS. 7A and 7B, the common surface 10 constituting the inner peripheral surface of the intake duct connecting portion 4 is connected to the intake ducts 12 and 14 at the first stage 6 and the second stage 8. Is commonly used. That is, the first stage 6 on the large diameter side is formed in a state orthogonal to the intake flow path, but the second stage 8 on the small diameter side is formed obliquely in the intake flow path. As a result, the common surface 10 is shared.

そして第1段6が吸気流路に直交状態で形成されていることに対応して、大径の湾曲状吸気ダクト12の先端と第1段6との間をシールしているシール材18は、配置された状態では円形リング状とされている。更に第2段8が吸気流路に斜めに形成されていることに対応して、小径の湾曲状吸気ダクト14の先端と第2段8との間をシールしているシール材20は、配置された状態では長円形リング状とされている。   Corresponding to the fact that the first stage 6 is formed orthogonal to the intake flow path, the sealing material 18 that seals between the tip of the large-diameter curved intake duct 12 and the first stage 6 is: In the arranged state, it is a circular ring shape. Further, corresponding to the fact that the second stage 8 is formed obliquely in the intake flow path, the sealing material 20 that seals between the tip of the small diameter curved intake duct 14 and the second stage 8 is disposed. In this state, it has an oval ring shape.

小径の湾曲状吸気ダクト14の先端は、ダクト中心軸に対して斜めに切断した形状であり、その接続側開口部14bはエアクリーナ2の中心側(図7では上側)に向けられている。
〈作用〉図7の(a)のごとく大径の湾曲状吸気ダクト12を第1段6に取り付けることにより、湾曲状吸気ダクト12内を流れた吸気流Gfは、吸気ダクト接続部4からエアクリーナハウジング2a内に流れ込む。大径の湾曲状吸気ダクト12からエアクリーナハウジング2a内に吸気が流れ込む際に、第1段6と第2段8との間の段差8aにより、流路断面積が湾曲内側にて縮小する。
The distal end of the small-diameter curved intake duct 14 has a shape cut obliquely with respect to the duct central axis, and the connection side opening 14b is directed to the center side of the air cleaner 2 (upper side in FIG. 7).
<Operation> By attaching the large-diameter curved intake duct 12 to the first stage 6 as shown in FIG. 7A, the intake air flow Gf flowing in the curved intake duct 12 flows from the intake duct connecting portion 4 to the air cleaner. It flows into the housing 2a. When intake air flows into the air cleaner housing 2a from the large-diameter curved intake duct 12, the cross-sectional area of the flow path is reduced inside the curve due to the step 8a between the first step 6 and the second step 8.

しかし図7の(a)に示したごとく、吸気流Gfが湾曲する湾曲状吸気ダクト12内を流れるため、湾曲内側に吸気流の剥離を生じ、このことによりエアクリーナ2内への吸気流入量にはほとんど寄与しないデッドスペース16が、段差8aの位置に対応して生じる。   However, as shown in FIG. 7A, since the intake flow Gf flows in the curved intake duct 12, the intake flow is separated on the inner side of the curve, and this causes the intake air flow into the air cleaner 2 to be reduced. The dead space 16 that hardly contributes is generated corresponding to the position of the step 8a.

したがって湾曲状吸気ダクト12側から第2段8内に流入する吸気流は、流路断面積が湾曲内側にて縮小していても流入が阻害されることはなく、流動部分はほぼそのまま、湾曲状吸気ダクト12から第2段8内へ流入することになる。   Therefore, the inflow of the intake air flowing into the second stage 8 from the curved intake duct 12 side is not hindered even if the flow path cross-sectional area is reduced on the inner side of the curve, and the flow part is curved as it is. From the air intake duct 12 into the second stage 8.

図7の(b)のごとく小径の湾曲状吸気ダクト14を第2段8に接続する場合には、上流の第1段6を通過させて下流側の第2段8の位置にてエアクリーナ2の流入口4aに接続することができる。
〈効果〉(1)エアクリーナ2において、同一の流入口4aには、吸気流方向に配列して、流路断面積が異なる複数段6,8が形成され、吸気流の上流に行くほど、第2段8から第1段6へと、段の流路断面積は拡大されている。このことにより前述したごとく各段6,8の位置で、接続開口径の異なる各種の吸気ダクト12,14を接続できる。
When the small-diameter curved intake duct 14 is connected to the second stage 8 as shown in FIG. 7B, the air cleaner 2 is passed through the upstream first stage 6 at the downstream second stage 8 position. Can be connected to the inlet 4a.
<Effect> (1) In the air cleaner 2, the same inlet 4 a is formed with a plurality of stages 6, 8 having different flow path cross-sectional areas arranged in the intake flow direction. From the second stage 8 to the first stage 6, the channel cross-sectional area of the stage is enlarged. As a result, as described above, various intake ducts 12 and 14 having different connection opening diameters can be connected at the positions of the stages 6 and 8.

接続開口径の小さい吸気ダクト14の場合には、前述したごとく上流の第1段6を通過させて下流側の第2段8の位置にてエアクリーナ2の流入口4aに接続することができるので、外部からエアクリーナ2内部に吸気を導入することができると共に、接続開口径が小さいために省スペースや騒音低減効果が高くなる。   In the case of the intake duct 14 having a small connection opening diameter, it can be passed through the upstream first stage 6 and connected to the inlet 4a of the air cleaner 2 at the position of the downstream second stage 8 as described above. In addition, intake air can be introduced into the air cleaner 2 from the outside, and since the connection opening diameter is small, space saving and noise reduction effects are enhanced.

接続開口径の大きい吸気ダクト12の場合には、上流側の第1段6の位置にてエアクリーナ2の流入口4aに接続することにより、外部からエアクリーナ2内部に吸気を導入することができる。   In the case of the intake duct 12 having a large connection opening diameter, the intake air can be introduced into the air cleaner 2 from the outside by connecting to the inlet 4a of the air cleaner 2 at the position of the first stage 6 on the upstream side.

このように接続開口径の大きい吸気ダクト12の場合には、その下流側の第2段8の位置で流路断面積が小さくなってしまう。しかし前述したごとく流路断面積を小さくしている段差8aは湾曲状吸気ダクト12の湾曲内側であることから吸気流には大きな影響はなく、エアクリーナ2内に導入しようとしている大量の吸気量を維持できる。したがって大径の吸気ダクト12の場合に、上流側の第1段6の位置にてエアクリーナ2の流入口4aに接続ができると共に、吸気流量も十分に確保可能である。   Thus, in the case of the intake duct 12 having a large connection opening diameter, the flow path cross-sectional area becomes small at the position of the second stage 8 on the downstream side. However, as described above, the step 8a that reduces the cross-sectional area of the flow path is inside the curved intake duct 12, so there is no significant effect on the intake flow, and a large amount of intake air to be introduced into the air cleaner 2 can be obtained. Can be maintained. Therefore, in the case of the large-diameter intake duct 12, it can be connected to the inlet 4a of the air cleaner 2 at the position of the first stage 6 on the upstream side, and a sufficient intake flow rate can be secured.

したがって本実施の形態の吸気ダクト接続構造は、1つのエアクリーナ2にて接続開口径の異なる吸気ダクト12,14に接続可能で、それぞれの要求性能に対応できる。
(2)吸気ダクト接続部4の2段6,8は、下流側の第2段8を流路に対して斜めに配置することで、流路形状の拡大側とは反対側において共用面10を形成することで内周面を共通化している。このことにより拡大側とは反対側において吸気ダクト接続構造を短くでき、エアクリーナ2の小型化に貢献できる。
Therefore, the intake duct connection structure of the present embodiment can be connected to the intake ducts 12 and 14 having different connection opening diameters by one air cleaner 2, and can correspond to the respective required performance.
(2) The two stages 6 and 8 of the intake duct connection portion 4 are arranged so that the downstream second stage 8 is arranged obliquely with respect to the flow path, so that the common surface 10 on the side opposite to the enlarged side of the flow path shape. The inner peripheral surface is made common by forming. As a result, the intake duct connection structure can be shortened on the side opposite to the enlarged side, and the air cleaner 2 can be reduced in size.

(3)小径の吸気ダクト14を下流側の第2段8に接続したエアクリーナ装置AC2では、特に湾曲状吸気ダクト14の湾曲内側が流路形状の拡大側として接続している。すなわち大径の上流側の第1段6が拡大している側に小径の湾曲状吸気ダクト14の上流側が湾曲していることになる。このことから小径の湾曲状吸気ダクト14を、大径の上流側の第1段6の奥にある小径の下流側の第2段8に取り付ける際に、特に小径の湾曲状吸気ダクト14の曲率が大きくても、第1段6の縁6aが小径の湾曲状吸気ダクト14の湾曲内側部分14aに干渉することがない。したがって小径の湾曲状吸気ダクト14の曲率が大きくても、エアクリーナ装置AC2の組立が可能になると共に、エアクリーナ装置AC2の小型化に貢献できる。   (3) In the air cleaner apparatus AC2 in which the small-diameter intake duct 14 is connected to the second stage 8 on the downstream side, the curved inner side of the curved intake duct 14 is connected as the enlarged side of the flow path shape. That is, the upstream side of the small-diameter curved intake duct 14 is curved to the side where the first stage 6 on the upstream side of the large diameter is enlarged. Therefore, when the small-diameter curved intake duct 14 is attached to the small-diameter downstream second stage 8 at the back of the large-diameter upstream first stage 6, the curvature of the small-diameter curved intake duct 14 is particularly large. Is large, the edge 6a of the first stage 6 does not interfere with the curved inner portion 14a of the curved intake duct 14 having a small diameter. Therefore, even if the curvature of the small-diameter curved intake duct 14 is large, it is possible to assemble the air cleaner apparatus AC2 and contribute to the downsizing of the air cleaner apparatus AC2.

(4)エアクリーナ装置AC2では、上述したごとく湾曲状吸気ダクト14の接続側の先端がダクト中心軸に対して斜めに切断されたことにより、その接続側開口部14bはエアクリーナ2の中心側に向けられている。このことにより拡張比を大きくでき、騒音低減効果をより高くできる。   (4) In the air cleaner apparatus AC2, as described above, the connection-side tip of the curved intake duct 14 is cut obliquely with respect to the duct central axis, so that the connection-side opening 14b is directed toward the center of the air cleaner 2. It has been. As a result, the expansion ratio can be increased, and the noise reduction effect can be further increased.

特に小径の第2段8も斜めに形成されているので、この小径の第2段8と小径の湾曲状吸気ダクト14の先端との形状が適合し、エアクリーナ装置AC2の小型化に貢献できる。   In particular, since the small-diameter second stage 8 is also formed obliquely, the shapes of the small-diameter second stage 8 and the tip of the small-diameter curved intake duct 14 are matched, which can contribute to the downsizing of the air cleaner device AC2.

[実施の形態2]
〈構成〉本実施の形態におけるエアクリーナ102の吸気ダクト接続部104を、図8の(a)に示す。この吸気ダクト接続部104は、同一の流入口104aにおいて、流路断面積が異なる複数段、ここでは第1段106、第2段108、及び第3段110の3段が、吸気流方向に配列して形成されている。
[Embodiment 2]
<Configuration> FIG. 8A shows an intake duct connecting portion 104 of the air cleaner 102 in the present embodiment. The intake duct connecting portion 104 has a plurality of stages with different flow path cross-sectional areas at the same inlet 104a, in which three stages of the first stage 106, the second stage 108, and the third stage 110 are arranged in the intake flow direction. It is formed in an array.

ここで流路断面積が最小の第3段110がエアクリーナハウジング102a側に形成され、第3段110の先端に流路断面積が中程度の第2段108が形成され、第2段108の先端に流路断面積が最大の第1段106が形成されている。このように第2段108は第3段110よりも大径に形成されているが、第2段108における流路中心と第3段110における流路中心とは一致しておらず、第2段108は第3段110に対して一方側(図では下側)へずらした状態で形成されている。   Here, the third stage 110 having the smallest channel cross-sectional area is formed on the air cleaner housing 102a side, the second stage 108 having a medium channel cross-sectional area is formed at the tip of the third stage 110, and the second stage 108 A first stage 106 having the largest channel cross-sectional area is formed at the tip. As described above, the second stage 108 is formed to have a larger diameter than the third stage 110, but the flow path center in the second stage 108 and the flow path center in the third stage 110 do not coincide with each other. The stage 108 is formed in a state shifted to one side (lower side in the figure) with respect to the third stage 110.

更に第1段106は第2段108よりも大径に形成されているが、第1段106における流路中心と第2段108における流路中心とは一致しておらず、第1段106は第2段108に対して一方側(図では下側)へずらした状態で形成されている。   Further, the first stage 106 is formed to have a larger diameter than the second stage 108, but the flow path center in the first stage 106 and the flow path center in the second stage 108 do not coincide with each other. Is formed in a state shifted to one side (lower side in the figure) with respect to the second stage 108.

すなわち、第3段110に対してその吸気流の上流側で流路形状が一方側に偏って順次拡大されて第2段108及び第1段106が形成されている。このことで第1段106と第2段108とで流路断面積に差が設けられ、同様に第2段108と第3段110とで流路断面積に差が設けられている。   That is, the second stage 108 and the first stage 106 are formed by sequentially enlarging the flow path shape toward one side upstream of the intake air flow with respect to the third stage 110. Thus, a difference in flow path cross-sectional area is provided between the first stage 106 and the second stage 108, and similarly, a difference in flow path cross-sectional area is provided between the second stage 108 and the third stage 110.

そして吸気ダクト接続部104のこれら第1段106、第2段108及び第3段110は、拡大側とは反対側では内周面を共通化した共用面111としている。
〈作用〉この吸気ダクト接続部104には、図8の(b)〜(d)に示すごとく、第1段106の流路断面積に対応する大径の湾曲状吸気ダクト112、第2段108の流路断面積に対応する中径の湾曲状吸気ダクト114、及び第3段110の流路断面積に対応する小径の湾曲状吸気ダクト116のいずれかを選択して接続することができる。このことにより3段106〜110であっても、前記実施の形態1にて述べた作用を生じさせることができる。
〈効果〉(1)3段106〜110であっても、前記実施の形態1にて述べたごとくの効果を生じる。すなわち、特に接続開口径の最小の吸気ダクト116の場合には、図8の(d)に示すごとく、上流の第1段106及び第2段108を通過させて最下流側の第3段110の位置にてエアクリーナ102の流入口104aに接続することができる。このことにより、外部からエアクリーナ102内部に吸気を導入することができると共に、接続開口径が小さいために省スペースや騒音低減効果が高くなる。
The first stage 106, the second stage 108, and the third stage 110 of the intake duct connecting portion 104 serve as a common surface 111 having a common inner peripheral surface on the side opposite to the enlarged side.
<Operation> As shown in FIGS. 8B to 8D, the intake duct connecting portion 104 has a large-diameter curved intake duct 112 corresponding to the flow passage cross-sectional area of the first stage 106, the second stage. One of the medium-diameter curved intake duct 114 corresponding to the channel cross-sectional area 108 and the small-diameter curved intake duct 116 corresponding to the channel cross-sectional area of the third stage 110 can be selected and connected. . As a result, even with the three stages 106 to 110, the action described in the first embodiment can be produced.
<Effect> (1) Even in the third stage 106 to 110, the effect as described in the first embodiment is produced. That is, particularly in the case of the intake duct 116 having the smallest connection opening diameter, as shown in FIG. 8D, the first stage 106 and the second stage 108 on the upstream side are passed through the third stage 110 on the most downstream side. It is possible to connect to the inlet 104a of the air cleaner 102 at the position. As a result, intake air can be introduced into the air cleaner 102 from the outside, and since the connection opening diameter is small, the space saving and noise reduction effects are enhanced.

接続開口径の中程度の吸気ダクト114の場合には、図8の(c)に示すごとく、上流の第1段106を通過させて中間位置の第2段108にてエアクリーナ102の流入口104aに接続することができる。このことにより、外部からエアクリーナ102内部に吸気を導入することができると共に、接続開口径が中程度であるため省スペースや騒音低減効果と共に或る程度大量の吸気量を実現することができる。   In the case of the intake duct 114 having a medium connection opening diameter, as shown in FIG. 8C, the inlet 104a of the air cleaner 102 passes through the first stage 106 upstream and passes through the second stage 108 at the intermediate position. Can be connected to. As a result, intake air can be introduced into the air cleaner 102 from the outside, and since the connection opening diameter is medium, a certain amount of intake air can be realized with space saving and noise reduction effect.

接続開口径が最大の吸気ダクト112の場合には、図8の(b)に示すごとく、上流側の第1段106の位置にてエアクリーナ102の流入口104aに接続することにより、外部からエアクリーナ102内部に吸気を導入することができる。このように接続開口径の大きい吸気ダクト112の場合には、最上流側の第1段106の位置にて接続すると、下流側の段108,110の位置では接続開口径が小さくなってしまう。本実施の形態では、特に最下流側の第3段110にて、吸気ダクト112の流路断面積よりも、流路断面積が小さくなる。しかし前記実施の形態1にて述べたごとく段差110aは湾曲状吸気ダクト112の湾曲内側であるので、デッドスペース118により吸気流には大きな影響はなく、上流側の第1段106に吸気ダクト112を接続した場合に、エアクリーナ102内に導入しようとしている大量の吸気量を実現できる。   In the case of the intake duct 112 having the largest connection opening diameter, as shown in FIG. 8B, the air cleaner is connected from the outside by connecting to the inlet 104a of the air cleaner 102 at the position of the first stage 106 on the upstream side. Intake can be introduced into the interior 102. In the case of the intake duct 112 having a large connection opening diameter as described above, if the connection is made at the position of the first stage 106 on the most upstream side, the connection opening diameter becomes small at the positions of the downstream stages 108 and 110. In the present embodiment, the flow passage cross-sectional area is smaller than the flow passage cross-sectional area of the intake duct 112 particularly in the third stage 110 on the most downstream side. However, as described in the first embodiment, since the step 110a is inside the curved intake duct 112, the dead space 118 does not significantly affect the intake flow, and the intake duct 112 is not connected to the first stage 106 on the upstream side. Can be realized, a large amount of intake air to be introduced into the air cleaner 102 can be realized.

したがってこのように本実施の形態の吸気ダクト接続構造は、1つのエアクリーナ102にて接続開口径の異なる3種類の吸気ダクト112〜116に接続可能で、それぞれの要求性能に対応できる。   Therefore, in this way, the intake duct connection structure of the present embodiment can be connected to three types of intake ducts 112 to 116 having different connection opening diameters by one air cleaner 102, and can correspond to each required performance.

(2)前記実施の形態1の効果(2)〜(4)を生じる。
[その他の実施の形態]
・前記実施の形態1において、図7の(b)に示したごとく小径の吸気ダクト14は湾曲していたが、図9の(a)に示すごとく、小径の第2段8に湾曲していない直管状の小径の吸気ダクト214を配置しても良い。前記実施の形態2の第3段110についても同じである。
(2) The effects (2) to (4) of the first embodiment are produced.
[Other embodiments]
In the first embodiment, the small-diameter intake duct 14 is curved as shown in FIG. 7B. However, as shown in FIG. 9A, the small-diameter intake duct 14 is curved into the second step 8 having a small diameter. A straight tubular small-diameter intake duct 214 may be provided. The same applies to the third stage 110 of the second embodiment.

又、前記実施の形態1における小径の湾曲状吸気ダクト14は上述したごとく接続側の先端がダクト中心軸に対して斜めに切断されて、その接続側開口部がエアクリーナの中心側に向けられていた。この代わりに、図9の(b)に示すごとく先端がダクト中心軸に対して直角に切断された接続側開口部314aを有する湾曲状吸気ダクト314としても良い。前記実施の形態2の最小径の吸気ダクト116についても同じである。   Further, as described above, the small-diameter curved intake duct 14 in the first embodiment has its connection-side tip cut obliquely with respect to the duct center axis, and its connection-side opening is directed to the center side of the air cleaner. It was. Instead, as shown in FIG. 9B, a curved intake duct 314 having a connection-side opening 314a whose tip is cut at right angles to the duct central axis may be used. The same applies to the minimum-diameter intake duct 116 of the second embodiment.

2…エアクリーナ、2a…エアクリーナハウジング、4…吸気ダクト接続部、4a…流入口、6…第1段、6a…縁、8…第2段、8a…段差、10…共用面、12…大径の湾曲状吸気ダクト、14a…湾曲内側部分、14…小径の湾曲状吸気ダクト、14b…接続側開口部、16…デッドスペース、18,20…シール材、102…エアクリーナ、102a…エアクリーナハウジング、104…吸気ダクト接続部、104a…流入口、106…第1段、108…第2段、110…第3段、110a…段差、111…共用面、112…大径の湾曲状吸気ダクト、114…中径の湾曲状吸気ダクト、116…小径の湾曲状吸気ダクト、118…デッドスペース、214…直管状の小径の吸気ダクト、314…湾曲状吸気ダクト、314a…接続側開口部、AC1,AC2…エアクリーナ装置、Gf…吸気流。   DESCRIPTION OF SYMBOLS 2 ... Air cleaner, 2a ... Air cleaner housing, 4 ... Intake duct connection part, 4a ... Inlet, 6 ... First step, 6a ... Edge, 8 ... Second step, 8a ... Step, 10 ... Common surface, 12 ... Large diameter 14a ... curved inner portion, 14 ... small-diameter curved intake duct, 14b ... connection side opening, 16 ... dead space, 18, 20 ... sealing material, 102 ... air cleaner, 102a ... air cleaner housing, 104 ... intake duct connecting part, 104a ... inlet, 106 ... first stage, 108 ... second stage, 110 ... third stage, 110a ... step, 111 ... common surface, 112 ... large-diameter curved intake duct, 114 ... Medium-diameter curved intake duct, 116 ... small-diameter curved intake duct, 118 ... dead space, 214 ... straight tubular small-diameter intake duct, 314 ... curved intake duct, 314a ... connection Opening, AC1, AC2 ... air cleaner device, Gf ... intake air flow.

Claims (7)

接続部に接続した吸気ダクトを介して内燃機関用の吸気を導入するエアクリーナにおける吸気ダクト接続構造であって、
前記接続部は、同一の流入口に、流路断面積が異なる複数段を吸気流方向に配列して形成していると共に、吸気流の上流に行くほど、流路形状が一方側に偏って拡大されることで各段の流路断面積に差が設けられていることを特徴とする吸気ダクト接続構造。
An intake duct connection structure in an air cleaner that introduces intake air for an internal combustion engine through an intake duct connected to a connection part,
The connecting portion is formed by arranging a plurality of stages having different channel cross-sectional areas in the same inlet at the intake flow direction, and the flow channel shape is biased toward one side as it goes upstream of the intake flow. An intake duct connection structure characterized in that a difference is provided in the cross-sectional area of each stage by being enlarged.
請求項1に記載の吸気ダクト接続構造において、前記接続部は2段に形成されていることを特徴とする吸気ダクト接続構造。 The intake duct connection structure according to claim 1, wherein the connection portion is formed in two stages. 請求項2に記載の吸気ダクト接続構造において、前記接続部の2段は前記流路形状の拡大側とは反対側が内周面を共通化していることを特徴とする吸気ダクト接続構造。 3. The intake duct connection structure according to claim 2, wherein the two stages of the connection portion have a common inner peripheral surface on the side opposite to the enlarged side of the flow path shape. 請求項3に記載の吸気ダクト接続構造において、前記接続部の2段のうち、大径側の段は流路に直交状態に形成され、小径側の段は流路に斜めに形成されていることで、前記反対側の内周面が共通化されていることを特徴とする吸気ダクト接続構造。 4. The intake duct connection structure according to claim 3, wherein, among the two stages of the connection portion, the large-diameter side stage is formed orthogonal to the flow path, and the small-diameter side stage is formed obliquely in the flow path. Thus, the intake duct connection structure is characterized in that the opposite inner peripheral surface is shared. 請求項2〜4のいずれか一項に記載の吸気ダクト接続構造を備えたエアクリーナの前記接続部において、吸気流上流側の流路断面積が大きい方の段に、この流路断面積に対応する大径の湾曲状吸気ダクトを、この湾曲状吸気ダクトの湾曲内側を、前記流路形状の拡大側にして接続したことを特徴とするエアクリーナ装置。 In the said connection part of the air cleaner provided with the intake duct connection structure as described in any one of Claims 2-4, it respond | corresponds to this flow-path cross-sectional area in the step with the larger flow-path cross-sectional area of an intake flow upstream side. An air cleaner device comprising: a large-diameter curved intake duct connected to each other with a curved inner side of the curved intake duct arranged on the enlarged side of the flow path shape. 請求項2〜4のいずれか一項に記載の吸気ダクト接続構造を備えたエアクリーナの前記接続部において、吸気流の下流側の流路断面積が小さい方の段に、この流路断面積に対応する小径の湾曲状吸気ダクトを、この湾曲状吸気ダクトの湾曲内側を前記流路形状の拡大側にして接続したことを特徴とするエアクリーナ装置。 In the connection portion of the air cleaner provided with the intake duct connection structure according to any one of claims 2 to 4, the flow passage cross-sectional area is reduced to a step having a smaller flow passage cross-sectional area on the downstream side of the intake air flow. An air cleaner apparatus characterized in that a corresponding small-diameter curved intake duct is connected such that the curved inner side of the curved intake duct is on the enlarged side of the flow path shape. 請求項6に記載のエアクリーナ装置において、前記湾曲状吸気ダクトは接続側の先端がダクト中心軸に対して斜めに切断されていることにより、接続側開口部がエアクリーナ中心側に向けられていることを特徴とするエアクリーナ装置。 7. The air cleaner apparatus according to claim 6, wherein the connection-side opening of the curved intake duct is directed toward the center side of the air cleaner by cutting the end of the connection side obliquely with respect to the center axis of the duct. An air cleaner device.
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