JP2004124831A - Water entering prevention structure of manifold depression picking-out part of internal combustion engine intake system - Google Patents

Water entering prevention structure of manifold depression picking-out part of internal combustion engine intake system Download PDF

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Publication number
JP2004124831A
JP2004124831A JP2002290631A JP2002290631A JP2004124831A JP 2004124831 A JP2004124831 A JP 2004124831A JP 2002290631 A JP2002290631 A JP 2002290631A JP 2002290631 A JP2002290631 A JP 2002290631A JP 2004124831 A JP2004124831 A JP 2004124831A
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negative pressure
intake
combustion engine
internal combustion
baffle plate
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JP4088505B2 (en
Inventor
Shinji Sako
佐古　伸二
Kenji Watanabe
渡辺　健司
Hiroteru Akihisa
秋久　浩輝
Takashi Kawashima
川嶋　貴
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Denso Corp
Toyota Motor Corp
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Denso Corp
Toyota Motor Corp
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    • 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
    • F02M35/1034—Manufacturing and assembling intake systems
    • F02M35/10354—Joining multiple sections together
    • 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
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • 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
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10262—Flow guides, obstructions, deflectors or the like
    • 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)
  • Manufacturing & Machinery (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent water from entering a manifold depression picking-out part. <P>SOLUTION: This structure prevents droplets 30 from flying into the manifold depression picking-out part 12 of the internal combustion engine intake system 10. The internal combustion engine intake system 10 includes a recess part 11 retreating from an intake air flow 31. The manifold depression picking-out part 12 opens at a wall surface of the recess part 11. A baffle plate 20 is arranged inside the recess part 11 so as to surround the manifold depression picking-out part 12. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は内燃機関吸気系の吸気負圧取り出し部の水入り防止構造に関する。
【０００２】
【従来の技術】
トヨタ技術公開集１１８０３号に開示されているように、内燃機関吸気系には種々のホースが接続され、そのホースには水分を捕捉し放出する手段が講ぜられたものがある。
内燃機関吸気系には、スロットル弁下流に吸気負圧を取り出す吸気負圧取り出し部が設けられることがある。この吸気負圧取り出し部の一例として、ブレーキホースを介して、ブレーキブースタに内燃機関吸気系の吸気負圧を導く、ブレーク負圧取り出し部がある。
【０００３】
【非特許文献１】
トヨタ技術公開集１１８０３号
【０００４】
【発明が解決しようとする課題】
吸気には雨、雪などの水分や、ＥＧＲガス、ブローバイガス中に含まれる水分などがあり、これが吸気負圧取り出し部から負圧ホース内に侵入すると負圧ホースを閉塞して、種々の作動不全を生じるおそれがあるので、吸気負圧取り出し部は、水の来ない位置を選んで設定している。
したがって、吸気負圧取り出し部設定位置に制約がある。また、その吸気負圧取り出し部に接続するホース、配管類の取りまわし性が悪くなる。
本発明は、吸気負圧取り出し部の水入りを抑制できる、内燃機関吸気系の吸気負圧取り出し部の水入り防止構造を提供することにある。
【０００５】
【課題を解決するための手段】
上記目的を達成する本発明はつぎの通りである。
（１）　内燃機関吸気系の吸気負圧取り出し部に水滴が飛び込むことを防止する構造であって、
前記内燃機関吸気系は吸気流れから後退した凹部を有しており、該凹部の壁面に吸気負圧取り出し部が開口しており、該凹部内に前記吸気負圧取り出し部を囲むようにじゃま板が設けられている内燃機関吸気系の吸気負圧取り出し部の水入り防止構造。
（２）　前記吸気負圧取り出し部が設けられている前記内燃機関吸気系はサージタンクであり、前記吸気負圧取り出し部はブレーキホースを介してブレーキブースタに接続するブレーキ負圧の取り出し部であり、前記じゃま板は前記ブレーキホース内に水滴が侵入することを防止するじゃま板である、（１）記載の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造。
（３）　前記凹部の軸芯は前記サージタンクの壁面と直交する方向に延びており、前記吸気負圧取り出し部の開口の軸芯は前記凹部の軸芯と直交する方向に、かつ、吸気流れのうち前記サージタンクの壁面に沿って流れる吸気流れに平行な方向と直交する方向に延びており、前記じゃま板は前記吸気負圧取り出し部の開口の軸芯が延びる方向と直交する方向に延びている、（２）記載の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造。
（４）　前記じゃま板の、前記吸気負圧取り出し部の開口の軸芯を含み前記凹部の軸芯と直交する面で切って見た断面の形状は、ほぼ断面「Ｕ字」状であり、該「Ｕ字」は前記吸気負圧取り出し部の開口に対向して開放している、（１）記載の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造。
【０００６】
上記（１）〜（４）の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造では、吸気負圧取り出し部を囲むようにじゃま板が設けられているので、吸気負圧取り出し部の水入りを抑制できる。
【０００７】
【発明の実施の形態】
以下に、本発明の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造の望ましい実施例を図１〜図４（ただし、図４は比較例で本発明に含まず）を参照して説明する。
図１〜図３に示すように、本発明の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造は、内燃機関吸気系１０の吸気負圧取り出し部１２に水滴３０が飛び込むことを防止する構造である。内燃機関吸気系１０は吸気流れ３１から後退した凹部１１を有しており、凹部１１の壁面に吸気負圧取り出し部１２が開口している。凹部１１内には、吸気負圧取り出し部１２を囲むようにじゃま板２０が設けられている。凹部１１は開口端部が滑らかに湾曲した湾曲面１９となっている。凹部１１は側壁を有し、その側壁に吸気負圧取り出し部１２が開口している。
【０００８】
吸気負圧取り出し部１２が設けられている内燃機関吸気系１０は吸気通路のスロットル弁より下流の部位であれば何れの部位でもよいが、たとえば、サージタンク１３である。サージタンク１３もじゃま板２０も樹脂成形品で互いに一体的に成形される。
吸気負圧取り出し部１２はブレーキホースを介してブレーキブースタの負圧ダイアフラム室に接続するブレーキ負圧の取り出し部である。
じゃま板２０は、吸気中の水滴３０が凹部１１に流入して滞留し、吸気負圧取り出し部１２を通ってブレーキホース内に侵入することを防止するように凹部１１内に設置された板状の壁である。
【０００９】
凹部１１の軸芯１４は、凹部１１が設けられたサージタンク１３の壁面１５と直交する方向（ほぼ直交する方向を含む）に延びている。吸気負圧取り出し部１２の開口の軸芯１６は、凹部１１の軸芯１４と直交する方向（ほぼ直交する方向を含む）に、かつ、吸気流れのうちサージタンク１３の壁面１５に沿って流れる吸気流れ３１に平行な方向と直交する方向（ほぼ直交する方向を含む）に延びている。
【００１０】
じゃま板２０は吸気負圧取り出し部１２の開口の軸芯１６が延びる方向と直交する方向（ほぼ直交する方向を含む）に延びている。じゃま板２０は、凹部１１の軸芯１４と平行方向には、じゃま板２０の、凹部１１奥側の端部２１のみで凹部１１の壁と一体になっており、じゃま板２０の、凹部１１の開口部側に向かって延びている。じゃま板２０は、じゃま板２０の凹部１１奥側の端部２１を除き、凹部１１の壁とは離れており、凹部１１の壁との間に空間１７がある。凹部１１開口部側の、じゃま板２０の端部２２は、サージタンク１３の壁面１５の、凹部１１方向への延長面と、ほぼ同じ位置にある。じゃま板２０の、凹部１１の開口部側の端部２２は、サージタンク１３の壁面１５に沿って流れる吸気流れ３１に、ほぼ直交している。
【００１１】
じゃま板２０の、吸気負圧取り出し部１２の開口の軸芯１６を含み凹部１１の軸芯１４と直交する面で切って見た、断面の形状は、断面ほぼ「Ｕ字」状（「コ字」状）であり、この「Ｕ字」は吸気負圧取り出し部１２の開口に対向して（向かって）開放している。吸気負圧取り出し部１２は凹部１１の側壁に開口しており、この吸気負圧取り出し部１２が開口した凹部１１の側壁に、じゃま板２０の断面ほぼ「Ｕ字」状の開放側の端部２３が結合している。吸気負圧取り出し部１２が開口した凹部１１の側壁と断面ほぼ「Ｕ字」状のじゃま板２０で囲まれた空間１８は、じゃま板２０と凹部１１の壁との間の空間１７から、じゃま板２０によって区画されている。吸気負圧取り出し部１２が開口した凹部１１の側壁と断面ほぼ「Ｕ字」状のじゃま板２０で囲まれた空間１８は、凹部１１の軸芯１４と平行な方向には、サージタンク１３内に向かって開放しており、それと反対側は凹部１１の底部で閉塞されている。
【００１２】
つぎに、本発明の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造の作用を説明する。
図４は、本発明実施例の構造からじゃま板２０を除去した比較例（本発明に含まず）の構造を示している。この比較例において、雨や雪など、水滴３０を含んだ吸気がサージタンク１３の壁面１５に沿って流れると、凹部１１内のエアが吸気流れに引きずられて吸い出され、凹部１１内の圧力が下がるので、水滴３０を含んだ吸気流れの一部が凹部１１の開放側湾曲面１９に沿うように曲がって、凹部１１内に流入し、凹部１１内に渦を形成し、凹部１１内で滞留する。凹部１１内で滞留する吸気の水滴３０は、凹部１１に開口する吸気負圧取り出し部１２から負圧ホース内に容易に入る。負圧ホース内に侵入した水滴は、たとえば氷結したような場合、負圧ホースを閉塞し、ブレーキブースタの作動不全を起こすおそれがある。
【００１３】
しかし、本発明では、図２に示すように、雨や雪など、水滴３０を含んだ吸気がサージタンク１３の壁面１５に沿って流れると、凹部１１内（空間１７および空間１８内）のエアが吸気流れに引きずられて吸い出され、凹部１１内の圧力が下がり、水滴３０を含んだ吸気流れの一部が凹部１１の開放側湾曲面１９に沿うように曲がろうとするが、その流れはじゃま板２０に当たってしまうので、開放側湾曲面１９に沿って円滑に凹部１１内に流入できない。凹部１１内でかつじゃま板２０外の空間１７に乱流が生じ、この乱流は、サージタンク１３の壁面１５に沿って流れる吸気流れ３１を、開放側湾曲面１９から剥離させ、直進させる。
この直進流は、じゃま板２０内の空間１８にもほとんど入ることなく、直進して凹部１１を通り過ぎる。したがって、水滴３０を含んだ吸気が凹部１１内に流入して凹部１１内で滞留し負圧ホースに侵入することがなく、吸気負圧で作動する機器（たとえば、ブレーキブースタ）が作動不全を起こすおそれが低減する。
【００１４】
その他の作用として、凹部１１開口部側の、じゃま板２０の端部２２は、サージタンク１３の壁面１５の、凹部１１方向への延長面と、ほぼ同じ位置にあるので、吸気流れ３１内に突入して吸気流れを阻害することもない。
また、吸気負圧取り出し部１２の開口の軸芯１６が吸気流れと平行な方向に対してほぼ直交しているので、吸気負圧取り出し部１２の開口は吸気流れが空間１８内に少量入ったとしてもその流れおよびそれによる渦流と直交しており、吸気流れ３１およびそれに含まれる水滴３０が、直接、吸気負圧取り出し部１２の開口に飛び込むことはない。
また、じゃま板２０が凹部１１の奥から凹部開口部に向かって延びているので、成形時にアンダカット部がなく、じゃま板２０を凹部１１の壁とともに樹脂成形することができる。
【００１５】
【発明の効果】
請求項１〜４の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造によれば、吸気負圧取り出し部を囲むようにじゃま板が設けられているので、吸気負圧取り出し部への水入りを抑制できる。
請求項２の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造によれば、サージタンクのブレーキ用負圧取り出し部への水入りを防止できる。
請求項３の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造によれば、吸気負圧取り出し部の開口の軸芯が吸気流れのうち前記サージタンクの壁面に沿って流れる吸気流れに平行な方向と直交する方向に延びているので、吸気に含まれる水滴の、吸気負圧取り出し部の開口への直接の飛び込みを防止できる。
請求項４の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造によれば、じゃま板がほぼＵ字状の断面を有しているので、吸気負圧取り出し部の開口を囲むことができる。
【図面の簡単な説明】
【図１】本発明の一実施例の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造の平面図である。
【図２】図１のＡ−Ａ断面図である。
【図３】図２の底面図である。
【図４】図２の構造からじゃま板を除去した比較例（本発明に含まず）の断面図である。
【符号の説明】
１０　内燃機関吸気系
１１　凹部
１２　吸気負圧取り出し部
１３　サージタンク
１４　凹部の軸芯
１５　サージタンクの壁面
１６　吸気負圧取り出し部の開口の軸芯
１７　凹部の壁とじゃま板間の空間
１８　じゃま板内の空間
１９　凹部の開口端部の湾曲面
２０　じゃま板
２１　じゃま板の凹部奥側の端部
２２　じゃま板の、凹部開口側の端部
２３　じゃま板の断面ほぼ「Ｕ字」状の開放側の端部
３０　水滴
３１　吸気流れ[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for preventing water from entering an intake negative pressure take-out portion of an internal combustion engine intake system.
[0002]
[Prior art]
As disclosed in Toyota Technical Publication No. 11803, various hoses are connected to an intake system of an internal combustion engine, and some of the hoses are provided with means for capturing and releasing moisture.
The intake system of the internal combustion engine may be provided with an intake negative pressure take-out unit that takes out the intake negative pressure downstream of the throttle valve. As an example of the intake negative pressure take-out unit, there is a break negative pressure take-out unit that guides intake negative pressure of the internal combustion engine intake system to a brake booster via a brake hose.
[0003]
[Non-patent document 1]
Toyota Technical Publication No. 11803 [0004]
[Problems to be solved by the invention]
The intake air contains moisture such as rain and snow, and the moisture contained in the EGR gas and blow-by gas. When this enters the negative pressure hose from the intake negative pressure outlet, it closes the negative pressure hose and performs various operations. Since there is a possibility of failure, the intake negative pressure take-out unit is set by selecting a position where water does not come.
Therefore, there is a restriction on the setting position of the intake negative pressure take-out portion. In addition, the routing of hoses and pipes connected to the intake negative pressure take-out portion is deteriorated.
An object of the present invention is to provide a structure for preventing water from entering an intake negative pressure take-out part of an internal combustion engine intake system, which can suppress water from entering the intake negative pressure take-out part.
[0005]
[Means for Solving the Problems]
The present invention that achieves the above object is as follows.
(1) A structure for preventing water droplets from jumping into an intake negative pressure extraction portion of an internal combustion engine intake system,
The internal combustion engine intake system has a recess recessed from the intake air flow, and an intake negative pressure extracting portion is opened on a wall surface of the concave portion, and a baffle plate is provided in the concave portion so as to surround the intake negative pressure extracting portion. A structure for preventing water from entering the intake negative pressure take-out part of the internal combustion engine intake system, which is provided with
(2) The intake system of the internal combustion engine provided with the intake negative pressure extracting unit is a surge tank, and the intake negative pressure extracting unit is a brake negative pressure extracting unit connected to a brake booster via a brake hose. The structure for preventing water from entering the intake negative pressure take-out portion of the internal combustion engine intake system according to (1), wherein the baffle plate is a baffle plate for preventing water droplets from entering the brake hose.
(3) The axis of the recess extends in a direction perpendicular to the wall surface of the surge tank, and the axis of the opening of the intake negative pressure outlet takes a direction perpendicular to the axis of the recess and the flow of the intake air. And extending in a direction perpendicular to a direction parallel to the flow of intake air flowing along the wall surface of the surge tank, and the baffle extends in a direction perpendicular to the direction in which the axis of the opening of the intake negative pressure extraction portion extends. (2) The structure for preventing water from entering the intake negative pressure take-out part of the internal combustion engine intake system according to (2).
(4) The cross-sectional shape of the baffle plate, which is cut along a plane including the axis of the opening of the intake negative pressure take-out portion and orthogonal to the axis of the concave portion, is substantially a U-shaped cross section, The structure for preventing water from entering the intake negative pressure take-out portion of the internal combustion engine intake system according to (1), wherein the “U” is open to face the opening of the intake negative pressure take-out portion.
[0006]
In the above-mentioned (1) to (4), in the structure for preventing water from entering the intake negative pressure extracting portion of the internal combustion engine intake system, the baffle plate is provided so as to surround the intake negative pressure extracting portion. Water entry can be suppressed.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of a structure for preventing water from entering the intake negative pressure take-out portion of the intake system of an internal combustion engine according to the present invention will be described with reference to FIGS. 1 to 4 (however, FIG. explain.
As shown in FIGS. 1 to 3, the structure for preventing water from entering the intake negative pressure take-out part of the internal combustion engine intake system of the present invention prevents water droplets 30 from jumping into the intake negative pressure take-out part 12 of the internal combustion engine intake system 10. It is a structure to do. The intake system 10 of the internal combustion engine has a concave portion 11 that is recessed from the intake flow 31, and an intake negative pressure extracting portion 12 opens on a wall surface of the concave portion 11. A baffle plate 20 is provided in the concave portion 11 so as to surround the intake negative pressure take-out portion 12. The concave portion 11 has a curved surface 19 whose opening end is smoothly curved. The concave portion 11 has a side wall, and the intake negative pressure extracting portion 12 is opened in the side wall.
[0008]
The internal combustion engine intake system 10 provided with the intake negative pressure take-out unit 12 may be any part as long as it is a part of the intake passage downstream of the throttle valve, but is, for example, a surge tank 13. Both the surge tank 13 and the baffle plate 20 are formed of resin and are integrally formed with each other.
The intake negative pressure take-out unit 12 is a take-out unit of a brake negative pressure connected to a negative pressure diaphragm chamber of a brake booster via a brake hose.
The baffle plate 20 is a plate-shaped member installed in the concave portion 11 so as to prevent the water droplet 30 in the intake air from flowing into and staying in the concave portion 11 and entering the brake hose through the intake negative pressure extracting portion 12. Is the wall.
[0009]
The axis 14 of the recess 11 extends in a direction perpendicular to the wall surface 15 of the surge tank 13 in which the recess 11 is provided (including a direction substantially perpendicular to the wall 15). The axis 16 of the opening of the intake negative pressure outlet 12 flows in a direction (including a direction substantially perpendicular to) the axis 14 of the recess 11 and along the wall surface 15 of the surge tank 13 in the intake flow. It extends in a direction orthogonal to a direction parallel to the intake air flow 31 (including a direction substantially orthogonal to the direction).
[0010]
The baffle plate 20 extends in a direction (including a direction substantially perpendicular to) the direction in which the axis 16 of the opening of the intake negative pressure extracting portion 12 extends. The baffle plate 20 is integrated with the wall of the recess 11 only at the end 21 on the deep side of the recess 11 in the direction parallel to the axis 14 of the recess 11. Extending toward the opening. The baffle plate 20 is apart from the wall of the recess 11 except for an end 21 on the inner side of the recess 11 of the baffle plate 20, and has a space 17 between the baffle plate 20 and the wall of the recess 11. The end 22 of the baffle plate 20 on the opening side of the recess 11 is located substantially at the same position as the extension surface of the wall surface 15 of the surge tank 13 in the direction of the recess 11. The end 22 of the baffle plate 20 on the opening side of the recess 11 is substantially perpendicular to the intake air flow 31 flowing along the wall surface 15 of the surge tank 13.
[0011]
The cross-sectional shape of the baffle plate 20 cut along a plane that includes the axis 16 of the opening of the intake negative pressure extraction section 12 and that is orthogonal to the axis 14 of the recess 11 has a substantially “U-shaped” cross section (“C”). The "U-shape" is open (facing) facing the opening of the intake negative pressure extracting portion 12. The suction negative pressure take-out portion 12 is open at the side wall of the concave portion 11, and the side of the concave portion 11 at which the intake negative pressure take-out portion 12 opens has an open-sided end substantially in the shape of a “U” in cross section of the baffle plate 20. 23 are bound. The space 18 surrounded by the side wall of the concave portion 11 in which the intake negative pressure take-out portion 12 is opened and the baffle plate 20 having a substantially “U-shaped” cross section is formed by a space 17 between the baffle plate 20 and the wall of the concave portion 11. It is partitioned by a plate 20. A space 18 surrounded by a side wall of the concave portion 11 in which the intake negative pressure take-out portion 12 is opened and a baffle plate 20 having a substantially “U-shaped” cross section is formed in the surge tank 13 in a direction parallel to the axis 14 of the concave portion 11. , And the opposite side is closed at the bottom of the recess 11.
[0012]
Next, the operation of the structure for preventing water from entering the intake negative pressure take-out portion of the internal combustion engine intake system of the present invention will be described.
FIG. 4 shows the structure of a comparative example (not included in the present invention) in which the baffle plate 20 is removed from the structure of the embodiment of the present invention. In this comparative example, when the intake air including the water droplets 30 such as rain and snow flows along the wall surface 15 of the surge tank 13, the air in the concave portion 11 is sucked out by being drawn by the intake air flow, and the pressure in the concave portion 11 is reduced. As a result, a part of the intake air flow including the water droplet 30 bends along the open curved surface 19 of the concave portion 11, flows into the concave portion 11, forms a vortex in the concave portion 11, and forms a vortex in the concave portion 11. Stay. The water droplets 30 of the intake air retained in the concave portion 11 easily enter the negative pressure hose from the intake negative pressure extracting portion 12 opened in the concave portion 11. If water droplets enter the negative pressure hose, for example, if they freeze, they may block the negative pressure hose and cause malfunction of the brake booster.
[0013]
However, in the present invention, as shown in FIG. 2, when the intake air including the water droplet 30 such as rain or snow flows along the wall surface 15 of the surge tank 13, the air in the recess 11 (the space 17 and the space 18) is generated. Is sucked out by being dragged by the intake flow, the pressure in the concave portion 11 decreases, and a part of the intake flow including the water droplet 30 tends to bend along the open curved surface 19 of the concave portion 11. Since it hits the baffle plate 20, it cannot flow into the recess 11 smoothly along the open side curved surface 19. Turbulence occurs in the space 17 inside the recess 11 and outside the baffle plate 20, and this turbulence causes the intake air flow 31 flowing along the wall surface 15 of the surge tank 13 to separate from the open-side curved surface 19 and go straight.
The straight flow hardly enters the space 18 in the baffle plate 20 and passes straight through the recess 11. Therefore, the intake air including the water droplets 30 does not flow into the concave portion 11, stays in the concave portion 11, and does not enter the negative pressure hose, and a device (eg, a brake booster) that operates by the intake negative pressure causes a malfunction. The risk is reduced.
[0014]
As another effect, the end 22 of the baffle plate 20 on the opening side of the recess 11 is located at substantially the same position as the extension surface of the wall surface 15 of the surge tank 13 in the direction of the recess 11. There is no rush to obstruct the intake air flow.
In addition, since the axis 16 of the opening of the intake negative pressure extraction unit 12 is substantially perpendicular to the direction parallel to the intake flow, a small amount of intake flow enters the space 18 at the opening of the intake negative pressure extraction unit 12. Even so, the flow and the swirl flow due to the flow are orthogonal to each other, and the intake flow 31 and the water droplets 30 contained therein do not directly jump into the opening of the intake negative pressure extracting portion 12.
In addition, since the baffle plate 20 extends from the depth of the recess 11 toward the recess opening, there is no undercut at the time of molding, and the baffle plate 20 can be resin-molded together with the wall of the recess 11.
[0015]
【The invention's effect】
According to the structure for preventing water from entering the intake negative pressure take-out portion of the internal combustion engine intake system according to claims 1 to 4, the baffle plate is provided so as to surround the intake negative pressure take-out portion. Water entry can be suppressed.
According to the second aspect of the present invention, it is possible to prevent water from entering the brake negative pressure take-out portion of the surge tank.
According to the structure for preventing water from entering the intake negative pressure take-out portion of the internal combustion engine intake system of the third aspect, the axis of the opening of the intake negative pressure take-out portion corresponds to the intake flow that flows along the wall surface of the surge tank in the intake flow. Since it extends in the direction perpendicular to the parallel direction, it is possible to prevent water droplets contained in the intake air from directly jumping into the opening of the intake negative pressure extracting portion.
According to the fourth aspect of the present invention, since the baffle plate has a substantially U-shaped cross section, it can surround the opening of the intake negative pressure outlet. it can.
[Brief description of the drawings]
FIG. 1 is a plan view of a structure for preventing water from entering an intake negative pressure take-out portion of an internal combustion engine intake system according to an embodiment of the present invention.
FIG. 2 is a sectional view taken along line AA of FIG.
FIG. 3 is a bottom view of FIG. 2;
FIG. 4 is a cross-sectional view of a comparative example (not included in the present invention) in which a baffle is removed from the structure of FIG. 2;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Internal-combustion-engine intake system 11 Recess 12 Intake negative-pressure taking-out part 13 Surge tank 14 Center of recess 15 Wall surface of surge tank 16 Axis of opening of intake-negative-pressure taking out part 17 Space between recessed wall and baffle 18 Baffle Inside space 19 Curved surface 20 at the opening end of the concave portion Baffle plate 21 End portion 22 at the inner side of the concave portion of the baffle plate End portion 23 of the baffle plate at the opening side of the concave portion Open side of the baffle plate having a substantially “U-shaped” cross section End 30 of water drop 31 intake flow

Claims (4)

内燃機関吸気系の吸気負圧取り出し部に水滴が飛び込むことを防止する構造であって、
前記内燃機関吸気系は吸気流れから後退した凹部を有しており、該凹部の壁面に吸気負圧取り出し部が開口しており、該凹部内に前記吸気負圧取り出し部を囲むようにじゃま板が設けられている内燃機関吸気系の吸気負圧取り出し部の水入り防止構造。A structure for preventing water droplets from jumping into an intake negative pressure take-out part of an internal combustion engine intake system,
The internal combustion engine intake system has a recess recessed from the intake air flow, and an intake negative pressure extracting portion is opened on a wall surface of the concave portion, and a baffle plate is provided in the concave portion so as to surround the intake negative pressure extracting portion. A structure for preventing water from entering the intake negative pressure take-out part of the internal combustion engine intake system, which is provided with 前記吸気負圧取り出し部が設けられている前記内燃機関吸気系はサージタンクであり、前記吸気負圧取り出し部はブレーキホースを介してブレーキブースタに接続するブレーキ負圧の取り出し部であり、前記じゃま板は前記ブレーキホース内に水滴が侵入することを防止するじゃま板である、請求項１記載の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造。The internal combustion engine intake system provided with the intake negative pressure extraction unit is a surge tank, and the intake negative pressure extraction unit is a brake negative pressure extraction unit connected to a brake booster via a brake hose. 2. The structure of claim 1, wherein the plate is a baffle plate for preventing water droplets from entering the brake hose. 前記凹部の軸芯は前記サージタンクの壁面と直交する方向に延びており、前記吸気負圧取り出し部の開口の軸芯は前記凹部の軸芯と直交する方向に、かつ、吸気流れのうち前記サージタンクの壁面に沿って流れる吸気流れに平行な方向と直交する方向に延びており、前記じゃま板は前記吸気負圧取り出し部の開口の軸芯が延びる方向と直交する方向に延びている、請求項２記載の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造。The axis of the recess extends in a direction perpendicular to the wall surface of the surge tank, and the axis of the opening of the suction negative pressure take-out portion extends in a direction perpendicular to the axis of the recess, and The baffle plate extends in a direction perpendicular to a direction parallel to a flow direction of the intake air flowing along the wall surface of the surge tank, and the baffle plate extends in a direction perpendicular to a direction in which the axis of the opening of the intake negative pressure extraction portion extends. The structure for preventing water from entering the intake negative pressure take-out part of the internal combustion engine intake system according to claim 2. 前記じゃま板の、前記吸気負圧取り出し部の開口の軸芯を含み前記凹部の軸芯と直交する面で切って見た断面の形状は、ほぼ断面「Ｕ字」状であり、該「Ｕ字」は前記吸気負圧取り出し部の開口に対向して開放している、請求項１記載の内燃機関吸気系の吸気負圧取り出し部の水入り防止構造。The cross-sectional shape of the baffle plate, which is cut along a plane including the axis of the opening of the suction negative pressure take-out portion and perpendicular to the axis of the concave portion, is substantially a “U-shaped” cross section. 2. The structure for preventing water from entering the intake negative pressure take-out part of the internal combustion engine intake system according to claim 1, wherein the character "" is open facing the opening of the intake negative pressure take-out part.
JP2002290631A 2002-10-03 2002-10-03 Structure for preventing water entry in intake negative pressure extraction part of intake system of internal combustion engine Expired - Fee Related JP4088505B2 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1750004A1 (en) 2005-08-02 2007-02-07 Toyota Jidosha Kabushiki Kaisha Resin intake manifold
EP2017460A1 (en) 2007-07-17 2009-01-21 HONDA MOTOR CO., Ltd. Intake device of internal combustion engine
EP2017461A1 (en) 2007-07-17 2009-01-21 HONDA MOTOR CO., Ltd. Intake device of internal combustion engine
DE102012024535B4 (en) * 2011-12-26 2015-10-22 Aisan Kogyo Kabushiki Kaisha inlet manifold
EP2963277A4 (en) * 2013-02-26 2016-11-09 Suzhou Cleva Prec Machinery & Technology Co Ltd Carburetor base of engine
US10001093B2 (en) 2016-01-21 2018-06-19 Ford Global Technologies, Llc Intake manifold having slosh prevention baffles
US10100791B2 (en) 2016-01-15 2018-10-16 Ford Global Technologies, Llc Intake manifold water management negative draft containment features

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1750004A1 (en) 2005-08-02 2007-02-07 Toyota Jidosha Kabushiki Kaisha Resin intake manifold
US7357110B2 (en) 2005-08-02 2008-04-15 Toyota Jidosha Kabushiki Kaisha Resin intake manifold
EP2017460A1 (en) 2007-07-17 2009-01-21 HONDA MOTOR CO., Ltd. Intake device of internal combustion engine
EP2017461A1 (en) 2007-07-17 2009-01-21 HONDA MOTOR CO., Ltd. Intake device of internal combustion engine
JP2009024523A (en) * 2007-07-17 2009-02-05 Honda Motor Co Ltd Intake device of internal combustion engine
JP2009024524A (en) * 2007-07-17 2009-02-05 Honda Motor Co Ltd Intake device of internal combustion engine
US7895984B2 (en) 2007-07-17 2011-03-01 Honda Motor Co. Ltd. Intake device of internal combustion engine
US7946267B2 (en) 2007-07-17 2011-05-24 Honda Motor Co., Ltd. Intake device of internal combustion engine
DE102012024535B4 (en) * 2011-12-26 2015-10-22 Aisan Kogyo Kabushiki Kaisha inlet manifold
EP2963277A4 (en) * 2013-02-26 2016-11-09 Suzhou Cleva Prec Machinery & Technology Co Ltd Carburetor base of engine
US10100791B2 (en) 2016-01-15 2018-10-16 Ford Global Technologies, Llc Intake manifold water management negative draft containment features
US10001093B2 (en) 2016-01-21 2018-06-19 Ford Global Technologies, Llc Intake manifold having slosh prevention baffles

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