JP2020197192A - Intake system of internal combustion engine for motor vehicle - Google Patents

Intake system of internal combustion engine for motor vehicle Download PDF

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JP2020197192A
JP2020197192A JP2019104975A JP2019104975A JP2020197192A JP 2020197192 A JP2020197192 A JP 2020197192A JP 2019104975 A JP2019104975 A JP 2019104975A JP 2019104975 A JP2019104975 A JP 2019104975A JP 2020197192 A JP2020197192 A JP 2020197192A
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body case
suction duct
air suction
air
main body
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JP7306882B2 (en
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孝平 杉原
Kohei Sugihara
孝平 杉原
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Daihatsu Motor Co Ltd
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    • 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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Abstract

To simplify a connection structure between an atmospheric air suctioning duct and a body case of an air cleaner to reduce costs and prevent water droplets from entering into the air cleaner from a connection part in an intake system in which the atmospheric air suctioning duct is connected to the body case.SOLUTION: In an intake system of an internal combustion engine for a motor vehicle, an atmospheric air intake port 16 provided at a body case 14 of an air cleaner 13 and a fitting part 26a provided at an atmospheric air suctioning duct 17 are fitted and an engagement claw 35 and an engagement hole 36 are fitted to connect the atmospheric air suctioning duct 17 to the body case 14. A water shielding rib 19 enclosing the atmospheric air intake port 16 and the fitting part 26a is integrally formed with the atmospheric air suctioning duct 17. The water shielding rib 19 can prevent water droplets from entering into the body case 14 from a gap between the atmospheric air intake port 16 and the fitting part 26a.SELECTED DRAWING: Figure 6

Description

本願発明は、自動車用内燃機関に装備する吸気装置に関するものである。 The present invention relates to an intake device installed in an internal combustion engine for an automobile.

自動車用内燃機関では、エアクリーナの本体ケース（ダスト室）に大気吸い込みダクトから大気を取り入れており、取り込まれた大気は、フィルターによって浄化されてクリーン室に流れている。そして、一般に、本体ケースの一側面に大気入り口が開口しており、この大気入り口に大気吸い込みダクトを接続している。 In an internal combustion engine for automobiles, air is taken into the main body case (dust chamber) of an air cleaner from an air suction duct, and the taken air is purified by a filter and flows into a clean room. In general, an air inlet is opened on one side of the main body case, and an air suction duct is connected to the air inlet.

大気吸い込みダクトの形態は様々であり、例えば特許文献１では、大気吸い込みダクトはエアクリーナから斜め下方に向かう姿勢になっており、その先端（下端）に、大気吸い込み口が車巾方向に向かうように開口している。 There are various forms of the air suction duct. For example, in Patent Document 1, the air suction duct is in a posture of diagonally downward from the air cleaner, and the air suction port is directed toward the width of the vehicle at the tip (lower end) of the air suction duct. It is open.

そして、走行風にのってエンジンルームに飛来した雨水や床下空間から跳ね上がった水が補機駆動ベルトによって上向きに飛ばされることがあるが、特許文献１では、補機駆動ベルトによって上向きに飛散した水滴が大気吸い込みダクトの吸い込み口に入り込むことを防止するため、大気吸い込みダクトの手前に遮水板を配置している。 Then, rainwater that has flown into the engine room due to the running wind and water that has jumped up from the underfloor space may be blown upward by the auxiliary drive belt, but in Patent Document 1, it is scattered upward by the auxiliary drive belt. An impermeable plate is placed in front of the air suction duct to prevent water droplets from entering the suction port of the air suction duct.

他方、特許文献２では、大気吸い込みダクトはエアクリーナの上方に配置されていて、大気吸い込みダクトの大気吸い込み口は車巾方向に開口しているが、この特許文献２では、走行風に載ってエンジンルームに入り込んだ雨水が大気吸い込みダクトの大気吸い込み口に入り込むことを防止するため、大気吸い込みダクトの手前に遮水板（水吸い込み防止板）を配置している。 On the other hand, in Patent Document 2, the air suction duct is arranged above the air cleaner, and the air suction port of the air suction duct opens in the vehicle width direction. However, in Patent Document 2, the engine is mounted on the running wind. In order to prevent rainwater that has entered the room from entering the air suction port of the air suction duct, a water shield plate (water suction prevention plate) is placed in front of the air suction duct.

実開昭６３−１５８５７４号のマイクロフィルムMicrofilm of No. 63-158574 特開２００８−２８６１４０号公報Japanese Unexamined Patent Publication No. 2008-286140

さて、大気吸い込みダクトとエアクリーナとの接続部はラフになっていることがあるため、本願発明者が観察したところ、特許文献１に開示されているように補機駆動ベルトによって水滴が上向きに飛散すると、飛散した水滴がエアクリーナと大気吸い込みダクトとの接続部に侵入することがあることが判明した。 By the way, since the connection portion between the air suction duct and the air cleaner may be rough, as observed by the inventor of the present application, water droplets are scattered upward by the auxiliary drive belt as disclosed in Patent Document 1. Then, it was found that the scattered water droplets may invade the connection portion between the air cleaner and the air suction duct.

そして、特許文献１，２の遮水板は、大気吸い込みダクトの吸い込み口に水が侵入することを防止するものであるため、エアクリーナと大気吸い込みダクトとの接続部に水滴が侵入することは防止できない。 Since the impermeable plates of Patent Documents 1 and 2 prevent water from entering the suction port of the air suction duct, it prevents water droplets from entering the connection portion between the air cleaner and the air suction duct. Can not.

この点に対しては、エアクリーナと大気吸い込みダクトとの接続部にＯリング等のシール材を介在させることが考えられるが、これではコストが嵩むのみならず、組み付けに際してシール材が脱落してしまうと、シール性がなくなって、水の侵入に対して無防備になってしまうという問題がある。 To deal with this point, it is conceivable to interpose a sealing material such as an O-ring at the connection between the air cleaner and the air suction duct, but this not only increases the cost but also causes the sealing material to fall off during assembly. Then, there is a problem that the sealing property is lost and it becomes vulnerable to the intrusion of water.

本願発明は、このような現状を改善することを課題とするものである。 An object of the present invention is to improve such a current situation.

本願発明は、
「エアクリーナの本体ケースの一側面に大気入り口を開口し、前記大気入り口に大気吸い込みダクトを接続して成る吸気装置において、
前記エアクリーナ又は大気吸い込みダクトのうちいずれか一方又は両方に、略下方から飛散した水滴が前記エアクリーナと大気吸い込みダクトとの接続部に侵入することを阻止する遮水リブを一体に設けている」
という構成になっている。 The invention of the present application is
"In an air intake device consisting of an air inlet opened on one side of the air cleaner body case and an air suction duct connected to the air inlet.
One or both of the air cleaner and the air suction duct is integrally provided with an impermeable rib that prevents water droplets scattered from substantially below from entering the connection portion between the air cleaner and the air suction duct. "
It is configured as.

この場合、遮水リブは、エアクリーナと大気吸い込みダクトとの接続部の全周に亙って形成してもよいが、水滴の飛散可能性がある半周程度に設けたら足りる。 In this case, the impermeable rib may be formed over the entire circumference of the connection portion between the air cleaner and the air suction duct, but it is sufficient if the impermeable rib is provided at about half the circumference where water droplets may be scattered.

本願発明によると、補機駆動ベルトによって水滴が跳ね上げられてエアクリーナと大気吸い込みダクトとの接続部に向けて飛散したり、或いは、補機駆動ベルトによって斜め後ろに跳ね上げられた水滴がダッシュボードで反射して、後ろ側から接続部に向けて飛散したりしても、水滴が接続部に侵入することを遮水リブによって阻止できる。 According to the present invention, water droplets are splashed up by the auxiliary machine drive belt and scattered toward the connection portion between the air cleaner and the air suction duct, or water droplets splashed diagonally backward by the auxiliary machine drive belt are splashed on the dashboard. Even if the water droplets are reflected by the belt and scattered from the rear side toward the connection portion, the water droplets can be prevented from entering the connection portion by the impermeable rib.

そして、遮水リブはエアクリーナ又は大気吸い込みダクトに一体に形成されているため、組み付けの手間を無くしてコストを抑制できると共に、シール材のような脱落の問題はないため遮水機能が損なわれる問題は皆無である。従って、接続部からエアクリーナに水が侵入することを、低コストで実現できる。 Since the impermeable rib is integrally formed with the air cleaner or the air suction duct, the cost can be suppressed by eliminating the trouble of assembling, and the impermeable function is impaired because there is no problem of falling off like the sealing material. Is none. Therefore, it is possible to realize water entering the air cleaner from the connection portion at low cost.

遮水リブはエアクリーナに形成してもよいが、この場合、エアクリーナのダスト室（本体ケース）を製造する金型はかなり大きいため、新たに遮水リブを形成すると金型が大型化してコストが嵩むおそれがある。これに対して、実施形態のように遮水リブを大気吸い込みダクトに形成すると、大気吸い込みダクトを成形する金型はさほど大きくなくて遮水リブを追加しても大型化することはないため、コストが嵩むにしてもその程度を抑制できる利点がある。 The impermeable rib may be formed on the air cleaner, but in this case, the mold for manufacturing the dust chamber (main body case) of the air cleaner is quite large, so if a new impermeable rib is formed, the mold becomes large and the cost is increased. May be bulky. On the other hand, when the impermeable rib is formed in the air suction duct as in the embodiment, the mold for forming the air suction duct is not so large, and even if the impermeable rib is added, the size is not increased. Even if the cost increases, there is an advantage that the degree can be suppressed.

実施形態を適用した内燃機関を車幅方向（クランク軸線方向）から見た側面図である。It is a side view which looked at the internal combustion engine to which the embodiment was applied from the vehicle width direction (crank axis direction). 図１のII-II 視図（車体の前方を向いた背面図）である。It is a view of II-II of FIG. 1 (rear view facing the front of the vehicle body). エアクリーナと大気吸い込みダクトとを車体の後ろ下方から見た斜視図である。It is a perspective view of the air cleaner and the air suction duct seen from the rear lower part of the vehicle body. （Ａ）は側面図、（Ｂ）は大気吸い込みダクトのみの正面図である。(A) is a side view, and (B) is a front view of only the air suction duct. 図４（Ｂ）の V-V視図である。It is a VV perspective view of FIG. 4 (B). （Ａ）は図５のVIA-VIA 視断面図、（Ｂ）は図５のVIB-VIB 視断面図である。(A) is a sectional view taken along line VIA-VIA of FIG. 5, and FIG. 5B is a sectional view taken along line VIB-VIB of FIG.

次に、本願発明の実施形態を図面に基づいて説明する。以下では、方向を特定するため前後・左右の文言を使用するが、この方向は、自動車の運転者から見た方向としている。る。念のため、図１，２に方向を明示している。 Next, an embodiment of the present invention will be described with reference to the drawings. In the following, the words front and back, left and right are used to specify the direction, but this direction is the direction seen by the driver of the automobile. To. To be on the safe side, the directions are clearly shown in Figures 1 and 2.

(1).内燃機関の概要
図１，２に示すように、内燃機関は、クランク軸２が回転自在に保持されたシリンダブロック１と、その上面に固定されたシリンダヘッド３とを備えており、シリンダヘッド３の上面にはヘッドカバー４が固定されている一方、シリンダブロック１の下面にはオイルパン５が固定されている。また、シリンダブロック１の前面とシリンダヘッド３の前面には、タイミングチェーンを覆うフロントカバー６が重ね固定されている。 (1). Overview of the internal combustion engine As shown in FIGS. 1 and 2, the internal combustion engine includes a cylinder block 1 in which the crankshaft 2 is rotatably held, and a cylinder head 3 fixed to the upper surface thereof. The head cover 4 is fixed to the upper surface of the cylinder head 3, while the oil pan 5 is fixed to the lower surface of the cylinder block 1. Further, a front cover 6 covering the timing chain is overlapped and fixed on the front surface of the cylinder block 1 and the front surface of the cylinder head 3.

シリンダブロック１、シリンダヘッド３、ヘッドカバー４、オイルパン５、フロントカバー６によって機関本体が構成されている。なお、フロントカバー６は、オイルパン５の上部にも重なっている。また、ヘッドカバー４の前部は、フロントカバー６の上面に重ね固定されている。 The engine body is composed of a cylinder block 1, a cylinder head 3, a head cover 4, an oil pan 5, and a front cover 6. The front cover 6 also overlaps the upper part of the oil pan 5. Further, the front portion of the head cover 4 is overlapped and fixed on the upper surface of the front cover 6.

クランク軸２の前端部はフロントカバー６の外側に露出しており、この露出した前部にクランクプーリ７が固定されている。クランクプーリ７には補機駆動ベルト８が巻き掛けられており、補機駆動ベルト８によってオルタネータ９が駆動されている。符号１０で示すのはアイドルプーリであり、符号１１で示すのはテンションプーリである。クランク軸２は、図１の状態で右回りに回転する。 The front end portion of the crankshaft 2 is exposed to the outside of the front cover 6, and the crank pulley 7 is fixed to the exposed front portion. The auxiliary machine drive belt 8 is wound around the crank pulley 7, and the alternator 9 is driven by the auxiliary machine drive belt 8. Reference numeral 10 indicates an idle pulley, and reference numeral 11 indicates a tension pulley. The crankshaft 2 rotates clockwise in the state shown in FIG.

本実施形態の内燃機関は、クランク軸２を車幅方向に長い姿勢としており、また、排気側面を前に向けて吸気側面を後ろに向けている。従って、内燃機関は横置き前排気方式になっており、シリンダヘッド３の後ろ側に、サージタンクを備えた吸気マニホールド１２が配置されている。 In the internal combustion engine of the present embodiment, the crankshaft 2 has a long posture in the vehicle width direction, and the exhaust side surface is directed forward and the intake side surface is directed rearward. Therefore, the internal combustion engine has a transverse front exhaust system, and an intake manifold 12 provided with a surge tank is arranged behind the cylinder head 3.

機関本体の上方部の前部上方に、後ろ側にずれた状態でエアクリーナ１３が配置されている。エアクリーナ１３は、本体ケース１４と、本体ケース１４に上から開閉自在に装着されたカバーケース（蓋）１５とを備えており、カバーケース１５と本体ケース１４との間にフィルタエレメントが挟み固定されている。本体ケース１４とカバーケース１５は合成樹脂製品である。 The air cleaner 13 is arranged above the front portion of the upper portion of the engine body in a state of being displaced to the rear side. The air cleaner 13 includes a main body case 14 and a cover case (lid) 15 that is openably and closably attached to the main body case 14 from above, and a filter element is sandwiched and fixed between the cover case 15 and the main body case 14. ing. The main body case 14 and the cover case 15 are synthetic resin products.

図２のとおり、背面視（及び正面視）では、エアクリーナ１３の本体ケース１４はヘッドカバー４と重なっているが、図１のとおり、側面視では、エアクリーナ１３の本体ケース１４はヘッドカバー４の後ろに位置している。従って、ヘッドカバー４と本体ケース１４とは干渉していない。 As shown in FIG. 2, the main body case 14 of the air cleaner 13 overlaps with the head cover 4 in the rear view (and front view), but as shown in FIG. 1, the main body case 14 of the air cleaner 13 is behind the head cover 4 in the side view. positioned. Therefore, the head cover 4 and the main body case 14 do not interfere with each other.

図２に点線で示すように、本体ケース１４の外周のうちフロントカバー６の側に位置した右側面に円筒状の大気入り口１６が突設されており、この大気入り口１６に、合成樹脂製の大気吸い込みダクト１７が装着されている。 As shown by the dotted line in FIG. 2, a cylindrical air inlet 16 is projected on the right side surface of the outer circumference of the main body case 14 located on the side of the front cover 6, and the air inlet 16 is made of synthetic resin. An air suction duct 17 is attached.

そして、図２のとおり、本体ケース１４と大気吸い込みダクト１７との接続部は補機駆動ベルト８のほぼ真上に位置しているため、走行風に載ってエンジンルーム内に飛来した水滴や、床下からエンジンルームに跳ね上がった水滴が補機駆動ベルト８に触れると、点線矢印で示すように、水滴が補機駆動ベルト８のガイド作用で上方に飛ばされて、これが本体ケース１４と大気吸い込みダクト１７との接続部に飛来したり、或いは、水滴が補機駆動ベルト８によって斜め後ろに飛ばされてから、車両のダッシュボード１８に反射して本体ケース１４と大気吸い込みダクト１７との接続部に向けて飛来する現象がある。 As shown in FIG. 2, since the connection portion between the main body case 14 and the air suction duct 17 is located almost directly above the auxiliary drive belt 8, water droplets flying into the engine room due to the running wind and water droplets When the water droplets that bounced from under the floor into the engine room touch the auxiliary drive belt 8, the water droplets are blown upward by the guide action of the auxiliary drive belt 8 as shown by the dotted arrow, and this is the main body case 14 and the air suction duct. After flying to the connection part with 17 or water droplets are blown diagonally backward by the auxiliary drive belt 8, it is reflected on the dashboard 18 of the vehicle and becomes the connection part between the main body case 14 and the air suction duct 17. There is a phenomenon of flying toward.

そこで、本実施形態では、大気吸い込みダクト１７に、当該大気吸い込みダクト１７と本体ケース１４との接続部に水滴が侵入することを防止する遮水リブ１９を形成している。以下、この点を説明する。 Therefore, in the present embodiment, the air suction duct 17 is formed with a water blocking rib 19 that prevents water droplets from entering the connection portion between the air suction duct 17 and the main body case 14. This point will be described below.

(2).大気吸い込みダクトとその接続構造
図３，４に示すように、大気吸い込みダクト１７は、本体ケース１４に取り付く基部２１と、基部２１の先端に繋がった側面視Ｃ型の立ち上がり部２２と、立ち上がり部２２の上先端から横向きに突出した吸い込み口２３とを有している。図２及び図４（Ｂ）に示すように、立ち上がり部２２の上端に横向き張り出し部２４を突設しており、横向き張り出し部２４が、本体ケース１４に形成したブラケット部２５（図２，３参照）にクリップで固定されている。 (2). Air suction duct and its connection structure As shown in FIGS. 3 and 4, the air suction duct 17 has a base 21 attached to the main body case 14 and a side view C-shaped rising portion 22 connected to the tip of the base 21. And a suction port 23 that projects laterally from the upper tip of the rising portion 22. As shown in FIGS. 2 and 4B, a laterally projecting portion 24 is projected from the upper end of the rising portion 22, and the laterally projecting portion 24 is a bracket portion 25 formed on the main body case 14 (FIGS. 2 and 3). It is fixed with a clip (see).

図６に示すように、大気吸い込みダクト１７は複数のパーツで構成されている。すなわち、大気吸い込みダクト１７は、本体ケース１４の大気入り口１６に内側から嵌る嵌合部２６ａを有する第１部材２６と、第１部材２６に重ね合わせた第２部材２７と、第１部材２６と第２部材２７とを有しており、第２部材２７に吸い込み口２３が一体に形成されている。 As shown in FIG. 6, the air suction duct 17 is composed of a plurality of parts. That is, the air suction duct 17 includes a first member 26 having a fitting portion 26a that fits into the air inlet 16 of the main body case 14 from the inside, a second member 27 superposed on the first member 26, and the first member 26. It has a second member 27, and a suction port 23 is integrally formed with the second member 27.

つまり、第１部材２６と第２部材２７とは、図４（Ｂ）に示す矢印２８で示す方向（左右方向）に重ね合わせることによって大気吸い込みダクト１７を構成している。従って、第１部材２６と第２部材２７とは、図４（Ｂ）に示す矢印２８の方向に相対動する金型を使用して製造されている。 That is, the first member 26 and the second member 27 form the air suction duct 17 by superimposing them in the direction (left-right direction) indicated by the arrow 28 shown in FIG. 4 (B). Therefore, the first member 26 and the second member 27 are manufactured by using a mold that moves relative to the direction of the arrow 28 shown in FIG. 4 (B).

例えば図４，５に示すように、第１部材２６及び第２部材２７は、立ち上がり部２２の箇所において、多数の窓穴２９を有するフレーム構造に形成されており、このフレーム構造の部位で、図６に示すように吸音材３０を挟み保持している。なお、図３では窓穴２９は省略している。 For example, as shown in FIGS. 4 and 5, the first member 26 and the second member 27 are formed in a frame structure having a large number of window holes 29 at the rising portion 22, and at the portion of the frame structure, the first member 26 and the second member 27 are formed. As shown in FIG. 6, the sound absorbing material 30 is sandwiched and held. Note that the window hole 29 is omitted in FIG.

また、第１部材２６と第２部材２７との重合部（合わせ面）には、互いに重なるフランジ３１，３２を形成しており、図６（Ａ）に示すように、フランジ３１，３２を、第１係合爪３３と第１係合穴３４とから成る第１係合手段によって連結している。第１係合穴３４と第１係合爪３３とは、適宜間隔を隔てて複数箇所に設けている。 Further, flanges 31 and 32 that overlap each other are formed in the overlapping portion (matching surface) of the first member 26 and the second member 27, and as shown in FIG. 6A, the flanges 31 and 32 are formed. It is connected by a first engaging means including a first engaging claw 33 and a first engaging hole 34. The first engaging hole 34 and the first engaging claw 33 are provided at a plurality of locations at appropriate intervals.

図６に示すように、第１部材２６に設けた嵌合部２６ａの下端部に、下向きに突出した第２係合爪３５を設けている一方、本体ケース１４に設けた大気入り口１６に、第２係合爪３５が嵌まり込む第２係合穴３６を形成している。従って、第１部材２６に設けた嵌合部２６ａをある程度の強さで大気入り口１６に押し込むと、弾性変形してから戻ることにより、第２係合爪３５が第２係合穴３６に係合する。そして、横向き張り出し部２４をブラケット部２５にビスで固定すると、大気吸い込みダクト１７は本体ケース１４に対して離脱不能に保持される。 As shown in FIG. 6, a second engaging claw 35 projecting downward is provided at the lower end of the fitting portion 26a provided on the first member 26, while the air inlet 16 provided on the main body case 14 is provided. A second engaging hole 36 into which the second engaging claw 35 is fitted is formed. Therefore, when the fitting portion 26a provided on the first member 26 is pushed into the atmosphere inlet 16 with a certain strength, the second engaging claw 35 engages with the second engaging hole 36 by elastically deforming and then returning. It fits. Then, when the laterally projecting portion 24 is fixed to the bracket portion 25 with screws, the air suction duct 17 is held inseparably from the main body case 14.

図６に明示するように、既述の遮水リブ１９は第２部材２７に一体に形成されている。すなわち、遮水リブ１９は、第１部材２６の嵌合部２６ａと本体ケース１４の大気入り口１６とを囲うように、フランジ２７ａを介して第２部材２７に一体に形成されており、図１や図４（Ａ）に示すように、遮水リブ１９は、後面部を中心にして、下面部から上面部に至る１８０度以上の範囲に広がっている。 As is clearly shown in FIG. 6, the above-mentioned impermeable rib 19 is integrally formed with the second member 27. That is, the impermeable rib 19 is integrally formed with the second member 27 via the flange 27a so as to surround the fitting portion 26a of the first member 26 and the air inlet 16 of the main body case 14. And as shown in FIG. 4A, the impermeable rib 19 extends over a range of 180 degrees or more from the lower surface portion to the upper surface portion with the rear surface portion as the center.

第２部材２７のフランジ２７ａと第１部材２６の嵌合部２６ａとは、第３係合穴３７と第３係合爪３８との組み合わせによって連結されている。従って、振動によって遮水リブ１９がガタつくことを防止できる。 The flange 27a of the second member 27 and the fitting portion 26a of the first member 26 are connected by a combination of the third engaging hole 37 and the third engaging claw 38. Therefore, it is possible to prevent the impermeable rib 19 from rattling due to vibration.

なお、本実施形態では、嵌合部２６ａの内部に流路面積調節部３９を設けて、本体ケース１４の内部通路４０は、流路面積調節部３９に対応した大きさに設定している。つまり、本体ケース１４の内部通路４０の断面積が大気吸い込みダクト１７の断面積よりも小さくなっており、このように本体ケース１４の内部通路４０の断面積を小さくすることによって機関運転時の吸気音を抑制できる利点がある。そして、本実施形態のように流路面積調節部３９を設けると、大気吸い込みダクト１７の断面積を小さくすることなく、本体ケース１４の内部通路４０の断面積を小さくできる。 In the present embodiment, the flow path area adjusting portion 39 is provided inside the fitting portion 26a, and the internal passage 40 of the main body case 14 is set to a size corresponding to the flow path area adjusting portion 39. That is, the cross-sectional area of the internal passage 40 of the main body case 14 is smaller than the cross-sectional area of the air suction duct 17, and by reducing the cross-sectional area of the internal passage 40 of the main body case 14 in this way, the intake air during engine operation is taken. It has the advantage of suppressing sound. If the flow path area adjusting unit 39 is provided as in the present embodiment, the cross-sectional area of the internal passage 40 of the main body case 14 can be reduced without reducing the cross-sectional area of the air suction duct 17.

また、流路面積調節部３９がリブ効果を発揮するため、大気吸い込みダクト１７の強度を向上できる。もとより、本体ケース１４に内部通路４０の大きさに対応した円形の大気入り口１６を形成して、大気吸い込みダクト１７には、大気入り口１６に対応した円形の嵌合部２６ａのみを形成してもよい。 Further, since the flow path area adjusting portion 39 exerts a rib effect, the strength of the air suction duct 17 can be improved. Of course, even if a circular air inlet 16 corresponding to the size of the internal passage 40 is formed in the main body case 14, and only a circular fitting portion 26a corresponding to the air inlet 16 is formed in the air suction duct 17. Good.

或いは、本体ケース１４の大気入り口１６を先広がりのテーパに形成する一方、大気吸い込みダクト１７の嵌合部２６ａを先窄まりのテーパに形成して、両者を嵌合させる構造を採用することにより、流路面積調節部３９を無くしつつ、本体ケース１４の内部通路４０を大気吸い込みダクト１７よりも小径に構成して、大気の吸い込み量の確保と吸気音抑制との両立を図ることも可能である。 Alternatively, by forming the air inlet 16 of the main body case 14 with a tapered tip, while forming the fitting portion 26a of the air suction duct 17 with a tapered tip, a structure is adopted in which both are fitted. It is also possible to eliminate the flow path area adjusting unit 39 and to configure the internal passage 40 of the main body case 14 to have a diameter smaller than that of the air suction duct 17 so as to secure the amount of air suction and suppress the intake noise. is there.

大気吸い込みダクト１７と本体ケース１４との接続は、第２係合爪３５と第２係合穴３６との係合によって行っており、ラフな接続構造になっているため、補機駆動ベルト８で飛ばされた水滴やダッシュボード１８で反射した水滴が接続部に飛来すると、水滴が接続部の隙間から本体ケース１４の内部に吸い込まれるおそれがあるが、本実施形態では、接続部は遮水リブ１９で囲われているため、水滴が接続部の隙間を通って本体ケース１４に吸い込まれることを防止できる。 The air suction duct 17 and the main body case 14 are connected by engaging the second engaging claw 35 and the second engaging hole 36, and because of the rough connection structure, the auxiliary machine drive belt 8 If the water droplets blown off by or reflected by the dashboard 18 fly to the connection portion, the water droplets may be sucked into the main body case 14 through the gap of the connection portion. However, in the present embodiment, the connection portion is water-shielded. Since it is surrounded by the rib 19, it is possible to prevent water droplets from being sucked into the main body case 14 through the gap of the connecting portion.

実施形態のように、第２部材２７に遮水リブ１９を形成すると、第１部材２６に係合爪３５，３８を容易に形成できる利点がある。 When the impermeable rib 19 is formed on the second member 27 as in the embodiment, there is an advantage that the engaging claws 35 and 38 can be easily formed on the first member 26.

以上、本願発明の実施形態を説明したが、本願発明は他にも様々に具体化できる。例えば、大気吸い込みダクトの形状は図示の形状には限らないのであり、様々な形状に変更できる。遮水リブは接続部の全周を覆ってもよい。遮水リブは本体ケースに形成してもよい。 Although the embodiments of the present invention have been described above, the present invention can be embodied in various ways. For example, the shape of the air suction duct is not limited to the shape shown in the figure, and can be changed to various shapes. The impermeable rib may cover the entire circumference of the connection portion. The impermeable rib may be formed on the main body case.

本願発明は、内燃機関の吸気装置に具体化できる。従って、産業上利利用できる。 The invention of the present application can be embodied in an intake device of an internal combustion engine. Therefore, it can be used industrially.

１ シリンダブロック
３ シリンダヘッド
４ ヘッドカバー
７ クランクプーリ
８ 補機駆動ベルト
１３ エアクリーナ
１４ 本体ケース
１６ 大気入り口
１７ 大気吸い込みダクト
１８ ダッシュボード
１９ 遮水リブ
２１ 大気吸い込みダクトの基部
２２ 大気吸い込みダクトの立ち上がり部
２３ 大気吸い込みダクトの吸い込み口
２６ 大気吸い込みダクトを構成する第１部材
２６ａ 嵌合部
２７ 大気吸い込みダクトを構成する第２部材
３５ 第２係合爪
３６ 第２係合穴 1 Cylinder block 3 Cylinder head 4 Head cover 7 Crank pulley 8 Auxiliary drive belt 13 Air cleaner 14 Main body case 16 Atmospheric inlet 17 Atmospheric suction duct 18 Dashboard 19 Impermeable rib 21 Atmospheric suction duct base 22 Atmospheric suction duct rising part 23 Atmosphere Suction port of suction duct 26 First member constituting the air suction duct 26a Fitting part 27 Second member constituting the air suction duct 35 Second engaging claw 36 Second engaging hole

Claims (1)

エアクリーナの本体ケースの一側面に大気入り口を開口し、前記大気入り口に大気吸い込みダクトを接続して成る構成であって、
前記エアクリーナ又は大気吸い込みダクトのうちいずれか一方又は両方に、略下方から飛散した水滴が前記エアクリーナと大気吸い込みダクトとの接続部に侵入することを阻止する遮水リブを一体に設けている、
自動車用内燃機関の吸気装置。 An air inlet is opened on one side of the main body case of the air cleaner, and an air suction duct is connected to the air inlet.
One or both of the air cleaner and the air suction duct is integrally provided with an impermeable rib that prevents water droplets scattered from substantially below from entering the connection portion between the air cleaner and the air suction duct.
Intake device for internal combustion engines for automobiles.
JP2019104975A 2019-06-05 2019-06-05 Intake device for internal combustion engine for automobile Active JP7306882B2 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001179023A (en) * 1999-12-24 2001-07-03 Wako Sangyo Kk Air cleaner
JP2005315214A (en) * 2004-04-30 2005-11-10 Kawasaki Heavy Ind Ltd Air-intake device of saddle type vehicle
JP2016011586A (en) * 2014-06-27 2016-01-21 トヨタ自動車株式会社 Air cleaner connection structure
JP2017180412A (en) * 2016-03-31 2017-10-05 本田技研工業株式会社 Air cleaner for vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001179023A (en) * 1999-12-24 2001-07-03 Wako Sangyo Kk Air cleaner
JP2005315214A (en) * 2004-04-30 2005-11-10 Kawasaki Heavy Ind Ltd Air-intake device of saddle type vehicle
JP2016011586A (en) * 2014-06-27 2016-01-21 トヨタ自動車株式会社 Air cleaner connection structure
JP2017180412A (en) * 2016-03-31 2017-10-05 本田技研工業株式会社 Air cleaner for vehicle

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