JP2007239629A - Intake air passage structure - Google Patents

Intake air passage structure Download PDF

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JP2007239629A
JP2007239629A JP2006063865A JP2006063865A JP2007239629A JP 2007239629 A JP2007239629 A JP 2007239629A JP 2006063865 A JP2006063865 A JP 2006063865A JP 2006063865 A JP2006063865 A JP 2006063865A JP 2007239629 A JP2007239629 A JP 2007239629A
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valve
intake
intake passage
intake air
groove
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JP4696978B2 (en
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Isao Otsu
功 大津
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Nissan 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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  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deposit and water which are causes of fixation of an intake air control valve controlling gas flow in an intake air passage from staying in an intake air control valve storage part. <P>SOLUTION: A groove 15 is formed on an intake air passage downstream side end part of the storage part 10 storing the intake air control valve 9 including a valve element 13 fixed on the valve shaft at one end and rotating between a valve close position under an erect position and a valve open position under a falling condition at the valve open position with being inclined to a gravity direction from the storage part 10 side to make deposit and water in the storage part 10 flow out of the groove 15 to an intake port 3 side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、内燃機関の吸気通路内のガス流動を制御する吸気制御弁を有する吸気通路構造に関し、特に、デポジットや氷結による吸気制御弁の固着を防止する技術に関する。   The present invention relates to an intake passage structure having an intake control valve that controls gas flow in an intake passage of an internal combustion engine, and more particularly to a technique for preventing sticking of an intake control valve due to deposits or icing.

従来、特許文献１に記載のように、吸気ポートの通路内を隔壁により２つの通路に区画形成し、一方の通路を開閉する吸気制御弁を設け、この吸気制御弁を閉弁動作させることにより、タンブルやスワール等の旋回流を生成する内燃機関の吸気装置が知られている。
かかる吸気装置において、前記特許文献１に記載のように、前記吸気制御弁が、弁体の一端側を吸気通路底壁側に軸支した弁軸に固定し、弁軸の回動により弁体を起立（閉弁状態）、倒伏（開弁状態）させる構造の場合に、その取付け構造として、吸気通路底壁側に凹状に形成した格納部を設け、開弁状態（倒伏状態）の時に吸気制御弁を格納部に格納するようにしたものがある。
実開平７−２５２６４号公報 Conventionally, as described in Patent Document 1, the passage of an intake port is partitioned into two passages by a partition, an intake control valve that opens and closes one of the passages is provided, and the intake control valve is closed. An intake device for an internal combustion engine that generates a swirl flow such as a tumble or a swirl is known.
In such an intake device, as described in Patent Document 1, the intake control valve is fixed to a valve shaft that pivotally supports one end side of the valve body on the intake passage bottom wall side, and the valve body is rotated by rotating the valve shaft. In the case of a structure that raises (closes the valve) and falls (opens the valve), the mounting structure is provided with a recessed storage part on the bottom wall side of the intake passage, and intake when the valve is open (loose) Some control valves are stored in a storage unit.
Japanese Utility Model Publication No. 7-25264

しかしながら、吸気制御弁を格納部に格納する構造にあっては、吸気制御弁の閉弁時は吸気流速が速いために、シリンダへ噴射した燃料の未燃成分がシリンダ側から吸気通路側に吹き返され、バスタブ状に凹んでいる格納部に前記未燃燃料成分が溜まり易い。そして、排気還流ガス（ＥＧＲガス）の流通等により格納部が高温になると、溜まった未燃燃料に多く含まれるＨＣ成分が酸化されてタール状のデポジットとなり、温度の低下に伴って固まり堆積する。このため、機関の停止時に、吸気通路温度の低下により凝縮水やデポジットが格納部に溜まり、これら凝縮水の氷結や堆積したデポジットの張り付きにより吸気制御弁が固着する虞れがある。   However, in the structure in which the intake control valve is stored in the storage portion, when the intake control valve is closed, the intake air flow rate is fast, so the unburned component of the fuel injected into the cylinder blows back from the cylinder side to the intake passage side. Therefore, the unburned fuel component tends to accumulate in the storage portion that is recessed in a bathtub shape. When the storage part becomes high temperature due to the circulation of the exhaust gas recirculation gas (EGR gas), the HC component contained in the accumulated unburned fuel is oxidized to form a tar-like deposit, which is hardened and deposited as the temperature decreases. . For this reason, when the engine is stopped, condensed water and deposits accumulate in the storage portion due to a decrease in the temperature of the intake passage, and there is a possibility that the intake control valve sticks due to freezing of these condensed water and sticking of accumulated deposits.

本発明は上記問題点に着目してなされたもので、格納部から水やデポジットが排出され易いようにして、デポジットや氷結による吸気制御弁の固着を防止することを目的とする。   The present invention has been made paying attention to the above problems, and it is an object of the present invention to prevent water and deposits from being easily discharged from the storage portion and to prevent the intake control valve from sticking due to deposits or freezing.

このため、本発明は、吸気通路底壁近傍に吸気流れ方向と直交する方向に軸支された弁軸と、該弁軸に一端が固定され、前記弁軸の回動により、前記吸気通路底壁に凹状に形成した格納部から起立する閉弁位置と前記格納部に倒伏格納される開弁位置との間を回動する弁体とを有し、該弁体の回動位置に応じてガス流動を制御する吸気制御弁を有する吸気通路構造であって、吸気通路幅より狭く、前記格納部から重力方向に傾斜させた溝を備えたことを特徴とする。   For this reason, the present invention provides a valve shaft that is pivotally supported in the direction perpendicular to the intake flow direction in the vicinity of the bottom wall of the intake passage, and one end of the valve shaft that is fixed to the valve shaft. A valve body that rotates between a valve closing position that stands up from a storage portion that is concavely formed on the wall and a valve opening position that is stored in a collapsed manner in the storage portion, depending on the rotation position of the valve body An intake passage structure having an intake control valve for controlling gas flow, characterized in that it has a groove that is narrower than the intake passage width and is inclined in the direction of gravity from the storage portion.

本発明によれば、格納部内に存在する固着原因物であるデポジットや水が溝から流れ出るので、格納部にデポジットや水が溜まることを防止でき、水の氷結やデポジットの張り付きによる吸気制御弁の固着を防止できる。   According to the present invention, since deposits and water that are sticking causes existing in the storage portion flow out of the groove, it is possible to prevent deposits and water from accumulating in the storage portion, and it is possible to prevent the intake control valve from being frozen or stuck to the deposit. Sticking can be prevented.

以下、本発明の実施形態を図面に基づいて説明する。
図１は、本発明の一実施形態に係る吸気通路構造の構成を示す図である。
図１において、シリンダヘッド１には、燃焼室２に接続する吸気ポート３が形成されている。吸気ポート３は、吸気バルブ４の開閉動作により燃焼室２と連通及び遮断される。前記吸気ポート３には、吸入空気を整流する横板状部材５，５と縦板状部材６，６が設けられている。７は燃料噴射弁である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of an intake passage structure according to an embodiment of the present invention.
In FIG. 1, an intake port 3 connected to a combustion chamber 2 is formed in the cylinder head 1. The intake port 3 is communicated with and blocked from the combustion chamber 2 by the opening / closing operation of the intake valve 4. The intake port 3 is provided with horizontal plate members 5 and 5 and vertical plate members 6 and 6 for rectifying intake air. 7 is a fuel injection valve.

吸気マニホールド８は、吸気ポート３と接続して吸気通路を構成している。吸気マニホールド８の吸気ポート３接続側端部近傍には、燃焼室２に供給するガス流動を制御する吸気制御弁９が配置されている。吸気制御弁９は、吸気マニホールド８底壁にバスタブ形状の凹部で形成した格納部１０に吸気流れ方向と直交する方向に軸支された弁軸１１と、この弁軸１１に基端側が図２に示すように例えばネジ１２によって固定され、弁軸１１の回動により格納部１０から起立して吸気マニホールド８の上壁に当接する図１に２点鎖線で示す閉弁位置と格納部１０に倒伏格納される図１に実線で示す開弁位置との間を図１の矢印で示すように回動する弁体１３とを備える。弁軸１１は、弁体１３の固定部分が半円形状に面取りされて平面状になっている。また、弁体１３の先端側には、前記閉弁位置において旋回流を発生させるための切欠部１３ａが形成されている。   The intake manifold 8 is connected to the intake port 3 to form an intake passage. An intake control valve 9 for controlling the flow of gas supplied to the combustion chamber 2 is disposed in the vicinity of the intake port 3 connection side end of the intake manifold 8. The intake control valve 9 includes a valve shaft 11 supported in a direction orthogonal to the intake flow direction in a storage portion 10 formed of a bathtub-shaped recess in the bottom wall of the intake manifold 8, and a base end side of the valve shaft 11 in FIG. As shown in FIG. 1, for example, the valve 12 is fixed by a screw 12 and stands up from the storage unit 10 by the rotation of the valve shaft 11 and contacts the upper wall of the intake manifold 8. A valve element 13 that rotates between the valve opening position indicated by the solid line in FIG. The valve shaft 11 has a flat shape in which a fixed portion of the valve body 13 is chamfered in a semicircular shape. Further, a notch 13a for generating a swirling flow at the valve closing position is formed on the distal end side of the valve body 13.

前記格納部１０の吸気通路下流側端部の略中央部には、図２及び図３に示すように、吸気通路幅より狭く、また、重力方向に滑らかに傾斜させてデポジットや水等の固着原因物１６を排出するための例えば略Ｖ字状の溝１５が形成されている。尚、溝１５の形状としては、Ｖ字状に限るものではなく、例えば半円形状等、どのような形状でもよい。
ここで、従来と同様の吸気制御弁９の制御について簡単に説明すると、
内燃機関の低回転低負荷時には、吸気制御弁９を図１の２点鎖線で示すように全閉とする。これにより、吸気マニホールド８を流れる吸入空気は吸気制御弁９の切欠部１３ａから吸気ポート３の横板状部材５と縦板状部材６により案内され燃焼室２に供給されて強い旋回流を形成する。内燃機関の中回転中負荷時は、吸気制御弁９を半開きにし、回転数及び負荷の程度に応じてその開度を決定する。内燃機関の高回転高負荷時には、吸気制御弁９を図１の実線で示すように全開とし、吸気制御弁９を格納部１０に格納して吸入空気の流動抵抗が増大するのを防ぐ。 As shown in FIG. 2 and FIG. 3, a deposit, water, or the like is adhered to the substantially central portion of the downstream end of the intake passage of the storage portion 10, narrower than the intake passage width and smoothly inclined in the direction of gravity. For example, a substantially V-shaped groove 15 for discharging the cause 16 is formed. The shape of the groove 15 is not limited to the V shape, and may be any shape such as a semicircular shape.
Here, the control of the intake control valve 9 similar to the conventional control will be briefly described.
When the internal combustion engine is under a low rotation and low load, the intake control valve 9 is fully closed as shown by a two-dot chain line in FIG. Thus, the intake air flowing through the intake manifold 8 is guided from the notch 13a of the intake control valve 9 by the horizontal plate member 5 and the vertical plate member 6 of the intake port 3 and supplied to the combustion chamber 2 to form a strong swirl flow. To do. When the internal combustion engine is under mid-rotation load, the intake control valve 9 is opened halfway, and the opening degree is determined according to the rotational speed and the degree of load. When the internal combustion engine is under high rotation and high load, the intake control valve 9 is fully opened as shown by the solid line in FIG. 1, and the intake control valve 9 is stored in the storage unit 10 to prevent the flow resistance of the intake air from increasing.

次に、本実施形態の動作について図３を参照して説明する。
内燃機関の低回転低負荷時に、吸気制御弁９を全閉として旋回流を生成する際、強い旋回流の発生により燃焼室２内から吸気通路側に未燃燃料の吹き返しがあり、この未燃燃料に起因して機関停止時に格納部１０内にデポジットが付着する。また、機関停止時に凝縮した水が格納部１０内に流れ込む。このデポジットや水は格納部１０の下流側端部側に流れて図３に示すように固着原因物１６として堆積しようとするが、重力方向に滑らかに傾斜させた溝１５によって、固着原因物１６は吸気ポート３側に流れ出て格納部１０から排出される。 Next, the operation of the present embodiment will be described with reference to FIG.
When generating a swirling flow with the intake control valve 9 fully closed when the internal combustion engine has a low rotation and a low load, the unburned fuel is blown back from the combustion chamber 2 to the intake passage side due to the generation of a strong swirling flow. Deposits are deposited in the storage unit 10 when the engine is stopped due to the fuel. Further, water condensed when the engine is stopped flows into the storage unit 10. This deposit or water flows toward the downstream end of the storage unit 10 and tries to accumulate as the sticking cause 16 as shown in FIG. 3, but the sticking cause 16 is caused by the groove 15 smoothly inclined in the direction of gravity. Flows out toward the intake port 3 and is discharged from the storage unit 10.

従って、本実施形態によれば、固着原因物１６が格納部１０に溜まるのを防止できるので、従来のような水の氷結やデポジットの弁体１３への張り付きによって吸気制御弁９が固着することを防止できる。これにより、次の機関始動時に吸気制御弁９が動作しない不具合を解消できる。また、溝１５の断面を、デポジットによる詰まりが生じない必要最低限の広さに設定すれば、吸気通路の断面形状をあまり変化させずに済み、吸気通路における吸入空気に対する流動抵抗の増大を抑えて機関の出力が低下するのを防止できる。尚、溝に代えて孔形状が考えられるが、孔形状の場合、デポジットに粘性があるためにデポジットによって詰まることが考えられる。   Therefore, according to the present embodiment, since the sticking cause 16 can be prevented from accumulating in the storage portion 10, the intake control valve 9 is stuck due to water icing or sticking of the deposit to the valve body 13 as in the prior art. Can be prevented. Thereby, the problem that the intake control valve 9 does not operate at the next engine start can be solved. Further, if the cross section of the groove 15 is set to a minimum necessary width that does not cause clogging due to deposits, it is not necessary to change the cross sectional shape of the intake passage so much, and an increase in flow resistance against intake air in the intake passage is suppressed. Therefore, it is possible to prevent the engine output from decreasing. In addition, although it replaces with a groove | channel and a hole shape is considered, in the case of a hole shape, since a deposit is viscous, it is thought that it is clogged with a deposit.

図４及び図５に、格納部１０に形成する溝の別の構成例を示す。尚図４及び図５では吸気制御弁９を図示省略してある。
図４は、デポジットや水を排出するための溝１５を、格納部１０の複数個所、例えば、吸気通路下流側端部の両端に形成する構成である。
自動車を停車させたとき、車体が水平状態にあることは少なく左右どちらかに傾いていることの方が多く、格納部１０のいずれか一方の端部側にデポジットや水が偏っていることが考えられる。従って、図４の構成のように格納部１０の両端に溝１５を形成すれば、デポジットや水が格納部１０のいずれか一方の端部に偏っても、デポジットや水を格納部１０から確実に排出することができるという効果を有する。 4 and 5 show another configuration example of the groove formed in the storage unit 10. 4 and 5, the intake control valve 9 is not shown.
FIG. 4 shows a configuration in which grooves 15 for discharging deposits and water are formed at a plurality of locations of the storage unit 10, for example, at both ends of the downstream end of the intake passage.
When the car is stopped, the vehicle body is rarely in a horizontal state and is more likely to be tilted to the left or right, and deposits and water are biased to either one end side of the storage unit 10 Conceivable. Therefore, if the grooves 15 are formed at both ends of the storage unit 10 as shown in the configuration of FIG. It has the effect that it can be discharged.

図５は、溝１５を、格納部１０の吸気通路下流側端部の両端及び中央部の３箇所に形成する構成であり、図４の構成の効果に加えて、更に溝が増えることにより、デポジットや水の排出が円滑にできる。
尚、上述の実施形態では、シリンダヘッド１の吸気ポート３と滑らかに接続するように、吸気マニホールド８に溝１５を形成する構成を示したが、必要に応じて、吸気ポート３側に溝１５先端部を形成し、吸気マニホールド８と吸気ポート３に跨って溝１５が形成されるような構成としてもよい。 FIG. 5 shows a configuration in which the grooves 15 are formed at three locations, both ends and the central portion of the downstream end of the intake passage of the storage unit 10, and in addition to the effects of the configuration of FIG. Deposits and water can be discharged smoothly.
In the above-described embodiment, the configuration in which the groove 15 is formed in the intake manifold 8 so as to be smoothly connected to the intake port 3 of the cylinder head 1 is shown. However, the groove 15 is formed on the intake port 3 side as necessary. It is good also as a structure which forms a front-end | tip part and the groove | channel 15 is formed ranging over the intake manifold 8 and the intake port 3. FIG.

また、溝１５の数は、上述した各実施形態のような１，２又３個に限定するものではないことは言うまでもなく、必要に応じて適当数形成すればよい。   Needless to say, the number of the grooves 15 is not limited to one, two, or three as in the above-described embodiments, and an appropriate number may be formed as necessary.

本発明に係る吸気通路構造の一実施形態を示す構成図The block diagram which shows one Embodiment of the intake passage structure which concerns on this invention 同上実施形態の吸気ポート側から見た格納部の拡大図The enlarged view of the storage part seen from the intake port side of the embodiment same as the above 同上実施形態の吸気ポートの格納部部分の拡大断面図The expanded sectional view of the storage part part of the intake port of the embodiment same as the above 格納部に形成する溝の別の構成例を示す図The figure which shows another structural example of the groove | channel formed in a storage part 格納部に形成する溝の更に別の構成例を示す図The figure which shows another structural example of the groove | channel formed in a storage part.

符号の説明Explanation of symbols

２ 燃焼室
３ 吸気ポート
８ 吸気マニホールド
９ 吸気制御弁
１０ 格納部
１１ 弁軸
１３ 弁体
１５ 溝 2 Combustion chamber 3 Intake port 8 Intake manifold 9 Intake control valve 10 Storage part 11 Valve shaft 13 Valve body 15 Groove

Claims (3)

吸気通路底壁近傍に吸気流れ方向と直交する方向に軸支された弁軸と、該弁軸に一端が固定され、前記弁軸の回動により、前記吸気通路底壁に凹状に形成した格納部から起立する閉弁位置と前記格納部に倒伏格納される開弁位置との間を回動する弁体とを有し、該弁体の回動位置に応じてガス流動を制御する吸気制御弁を有する吸気通路構造であって、
吸気通路幅より狭く、前記格納部から重力方向に傾斜させた溝を備えることを特徴とする吸気通路構造。 A valve shaft pivotally supported in a direction orthogonal to the intake flow direction in the vicinity of the intake passage bottom wall, and one end fixed to the valve shaft, and a storage formed in a concave shape on the intake passage bottom wall by rotation of the valve shaft Intake control that has a valve body that rotates between a valve-closing position that stands up from the part and a valve-opening position that is retracted and stored in the storage part, and controls gas flow in accordance with the rotational position of the valve body An intake passage structure having a valve,
An intake passage structure comprising a groove that is narrower than an intake passage width and is inclined in the direction of gravity from the storage portion. 前記溝を、前記格納部の複数個所に形成する構成とした請求項１に記載の吸気通路構造。   The intake passage structure according to claim 1, wherein the groove is formed at a plurality of locations of the storage portion. 前記溝を、前記格納部の吸気通路下流側端部の両端に形成する構成とした請求項２に記載の吸気通路構造。   The intake passage structure according to claim 2, wherein the groove is formed at both ends of the intake passage downstream end portion of the storage portion.
JP2006063865A 2006-03-09 2006-03-09 Intake passage structure Expired - Fee Related JP4696978B2 (en)

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Cited By (4)

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JP2008057525A (en) * 2006-07-31 2008-03-13 Toyota Motor Corp Intake structure for internal combustion engine
EP2772623A1 (en) * 2013-02-28 2014-09-03 MAHLE Filter Systems Japan Corporation Air intake system for internal combustion engine
JP2014227870A (en) * 2013-05-21 2014-12-08 株式会社マーレ フィルターシステムズ Intake system for internal combustion engine
JP2015140699A (en) * 2014-01-28 2015-08-03 アイシン精機株式会社 Intake structure and intake device of internal combustion engine

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Publication number Priority date Publication date Assignee Title
JP2008057525A (en) * 2006-07-31 2008-03-13 Toyota Motor Corp Intake structure for internal combustion engine
EP2772623A1 (en) * 2013-02-28 2014-09-03 MAHLE Filter Systems Japan Corporation Air intake system for internal combustion engine
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JP2015140699A (en) * 2014-01-28 2015-08-03 アイシン精機株式会社 Intake structure and intake device of internal combustion engine

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