JP2014134177A - Cylinder head - Google Patents

Cylinder head Download PDF

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JP2014134177A
JP2014134177A JP2013003681A JP2013003681A JP2014134177A JP 2014134177 A JP2014134177 A JP 2014134177A JP 2013003681 A JP2013003681 A JP 2013003681A JP 2013003681 A JP2013003681 A JP 2013003681A JP 2014134177 A JP2014134177 A JP 2014134177A
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passage
egr
region
egr passage
outflow
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JP5939167B2 (en
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Takahiro Harada
高宏 原田
Takehisa Fujita
武久 藤田
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Toyota Motor Corp
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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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  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a cylinder head capable of reducing a pressure drop which arises when EGR gas passes through an EGR passage provided within the cylinder head.SOLUTION: An inflow part 43IN for an EGR gas into an EGR passage 43 is shifted in a second direction with respect to an outflow part 43OUT for the EGR gas from the EGR passage 43. In a central section 433 of the EGR passage 43, a cross section area of an outflow region 47 nearer to the outflow part in the second direction is wider than a cross section area of an inflow region 46 nearer to the inflow part in the second direction.

Description

本発明は、ＥＧＲガスが通過するＥＧＲ通路が内部に設けられているシリンダヘッドに関する。   The present invention relates to a cylinder head in which an EGR passage through which EGR gas passes is provided.

エンジンの燃焼室から排出された排気の一部をＥＧＲガスとして吸気通路に還流させる排気還流装置として、例えば特許文献１〜３に記載されるように、シリンダヘッド内に設けられているＥＧＲ通路を通じてＥＧＲガスを還流させる装置が知られている。なお、ＥＧＲとは、「Exhaust Gas Recirculation」の略記である。こうした装置にあっては、冷却水が循環するウォータージャケットがシリンダヘッド内に設けられているため、シリンダヘッド内のＥＧＲ通路を通過する際にＥＧＲガスが冷却されるようになっている。   As an exhaust gas recirculation device that recirculates a part of the exhaust discharged from the combustion chamber of the engine to the intake passage as EGR gas, for example, as described in Patent Documents 1 to 3, through an EGR passage provided in the cylinder head An apparatus for refluxing EGR gas is known. EGR is an abbreviation for “Exhaust Gas Recirculation”. In such an apparatus, since a water jacket through which cooling water circulates is provided in the cylinder head, the EGR gas is cooled when passing through the EGR passage in the cylinder head.

特開２００４−２７８３４２号公報JP 2004-278342 A 特開２０１１−２５２４４１号公報JP 2011-252441 A 特開２０１１−１１１９３８号公報JP 2011-1111938 A

ところで、排気還流装置にあっては、ＥＧＲガスを効率良く吸気通路に還流させることが望まされている。そのため、ＥＧＲ通路が内部に設けられているシリンダヘッドでは、ＥＧＲガスを冷却させるだけではなく、同ＥＧＲ通路をＥＧＲガスが通過する際における圧力損失の低減が希求されている。   By the way, in the exhaust gas recirculation device, it is desired to efficiently recirculate the EGR gas to the intake passage. Therefore, in a cylinder head in which an EGR passage is provided, there is a demand for not only cooling the EGR gas but also reducing pressure loss when the EGR gas passes through the EGR passage.

本発明の目的は、内部に設けられたＥＧＲ通路をＥＧＲガスが通過する際に生じる圧力損失を低減させることができるシリンダヘッドを提供することにある。   The objective of this invention is providing the cylinder head which can reduce the pressure loss which arises when EGR gas passes through the EGR channel | path provided in the inside.

上記課題を解決するシリンダヘッドは、ＥＧＲ通路とウォータージャケットとが内部に設けられてなるシリンダヘッドを前提としている。このシリンダヘッドでは、ＥＧＲ通路の一端にはＥＧＲガスの流入部が設けられ、同ＥＧＲ通路の他端にはＥＧＲガスの流出部が設けられ、流入部及び流出部はＥＧＲ通路の延伸方向と直交する規定方向で互いにずれている。そして、このシリンダヘッドでは、ＥＧＲ通路の規定方向における流出部側の領域を流出部領域とし、ＥＧＲ通路の規定方向における流入部側の領域を流入部領域としたとき、流出部領域の通路断面積を流入部領域の通路断面積よりも広くした。   The cylinder head that solves the above problems is premised on a cylinder head in which an EGR passage and a water jacket are provided. In this cylinder head, an EGR gas inflow portion is provided at one end of the EGR passage, an EGR gas outflow portion is provided at the other end of the EGR passage, and the inflow portion and the outflow portion are orthogonal to the extending direction of the EGR passage. Are displaced from each other in the specified direction. In this cylinder head, when the region on the outflow portion side in the prescribed direction of the EGR passage is the outflow portion region, and the region on the inflow portion side in the prescribed direction of the EGR passage is the inflow portion region, the passage sectional area of the outflow portion region Is made wider than the cross-sectional area of the inflow region.

上記構成によれば、流入部を通じてＥＧＲ通路内に流入したＥＧＲガスは、通路断面積の狭い流入部領域から通路断面積の広い流出部領域に流れやすくなる。すなわち、ＥＧＲ通路内では、流入部から流出部へのＥＧＲガスの流れが形成されやすくなる。そのため、流入部を通じてＥＧＲ通路内に流入したＥＧＲガスを、流出部からＥＧＲ通路外に円滑に流出させ、ＥＧＲ通路をＥＧＲガスが通過する際における圧力損失を低減させることができるようになる。   According to the above configuration, the EGR gas that has flowed into the EGR passage through the inflow portion easily flows from the inflow portion region having a small passage cross-sectional area to the outflow portion region having a large passage cross-sectional area. That is, the flow of EGR gas from the inflow portion to the outflow portion is easily formed in the EGR passage. Therefore, the EGR gas that has flowed into the EGR passage through the inflow portion can smoothly flow out of the EGR passage from the outflow portion, and pressure loss when the EGR gas passes through the EGR passage can be reduced.

なお、上記のシリンダヘッドにおいては、流出部領域の通路断面積を、ＥＧＲ通路の延伸方向において流出部に近づくに連れて広くすることが好ましい。この構成によれば、流出部に近づくに連れて次第に流出部領域の通路断面積が広くなるため、流入部からＥＧＲ通路内に流入したＥＧＲガスは、徐々に流入部領域から流出部領域へと流れやすくなる。したがって、流入部を通じたＥＧＲ通路への流入直後はＥＧＲガスをＥＧＲ通路全体に行き渡らせてウォータージャケットを流れる冷却水との熱交換を促進させる一方で、徐々に流出部に向かう流れを形成することができ、ＥＧＲ通路をＥＧＲガスが通過する際における圧力損失を低減させるとともに、ＥＧＲガスの冷却効率を向上させることができるようになる。   In the above-described cylinder head, it is preferable that the passage cross-sectional area of the outflow portion region is widened as it approaches the outflow portion in the extending direction of the EGR passage. According to this configuration, the passage cross-sectional area of the outflow portion region gradually increases as it approaches the outflow portion, so that the EGR gas that has flowed into the EGR passage from the inflow portion gradually moves from the inflow portion region to the outflow portion region. It becomes easy to flow. Therefore, immediately after inflow to the EGR passage through the inflow portion, the EGR gas is spread over the entire EGR passage to promote heat exchange with the cooling water flowing through the water jacket, while gradually forming a flow toward the outflow portion. Thus, the pressure loss when the EGR gas passes through the EGR passage can be reduced, and the cooling efficiency of the EGR gas can be improved.

また、上記のシリンダヘッドにおいては、流入部領域の通路断面積を、ＥＧＲ通路の延伸方向において流出部に近づくに連れて狭くしてもよい。この構成によれば、流出部に近づくに連れて次第に流入部領域の通路断面積が狭くなる。そのため、この構成を採用しても、流入部からＥＧＲ通路内に流入したＥＧＲガスは徐々に流入部領域から流出部領域へと流れやすくなる。したがって、流入部を通じたＥＧＲ通路への流入直後はＥＧＲガスをＥＧＲ通路全体に行き渡らせてウォータージャケットを流れる冷却水との熱交換を促進させる一方で、徐々に流出部に向かう流れを形成することができ、ＥＧＲ通路をＥＧＲガスが通過する際における圧力損失を低減させるとともに、ＥＧＲガスの冷却効率を向上させることができるようになる。   In the above cylinder head, the passage cross-sectional area of the inflow portion region may be narrowed as it approaches the outflow portion in the extending direction of the EGR passage. According to this configuration, the passage cross-sectional area of the inflow portion region gradually becomes narrower as it approaches the outflow portion. Therefore, even if this configuration is adopted, the EGR gas that has flowed into the EGR passage from the inflow portion gradually flows from the inflow portion region to the outflow portion region. Therefore, immediately after inflow to the EGR passage through the inflow portion, the EGR gas is spread over the entire EGR passage to promote heat exchange with the cooling water flowing through the water jacket, while gradually forming a flow toward the outflow portion. Thus, the pressure loss when the EGR gas passes through the EGR passage can be reduced, and the cooling efficiency of the EGR gas can be improved.

ところで、シリンダヘッド内のＥＧＲ通路では、シリンダヘッドに設けられたウォータージャケット内を流れる冷却水による冷却効果によって凝縮水が発生することがある。そこで、上記のシリンダヘッドにあっては、流入部と流出部とを鉛直方向上下にずらした位置に設け、流出部を流入部よりも鉛直方向上側に配置するようにしてもよい。そして、流入部領域よりも鉛直方向上側に位置する流出部領域の通路断面積を流入部領域の通路断面積よりも広くすることが好ましい。こうした構成を採用すると、ＥＧＲ通路内で発生した凝縮水が上方に位置する流出部からは排出されにくくなる一方、下方に位置する流入部を介してＥＧＲ通路外に排出されやすくなる。そのため、ＥＧＲガスとともに凝縮水が燃焼室に導入されることを抑制するとともに、凝縮水を流入部側から排出し、ＥＧＲ通路内に凝縮水が滞留することによる内壁の腐食を抑制することができるようになる。   By the way, in the EGR passage in the cylinder head, condensed water may be generated due to the cooling effect by the cooling water flowing in the water jacket provided in the cylinder head. Therefore, in the above-described cylinder head, the inflow portion and the outflow portion may be provided at a position shifted vertically in the vertical direction, and the outflow portion may be disposed above the inflow portion in the vertical direction. And it is preferable to make the passage cross-sectional area of the outflow part area | region located in the perpendicular direction upper side rather than the inflow part area | region larger than the cross-sectional area of the inflow part area | region. When such a configuration is adopted, the condensed water generated in the EGR passage is difficult to be discharged from the outflow portion positioned above, but is easily discharged out of the EGR passage through the inflow portion positioned below. Therefore, it is possible to prevent the condensed water from being introduced into the combustion chamber together with the EGR gas, discharge the condensed water from the inflow portion side, and suppress the corrosion of the inner wall due to the condensed water remaining in the EGR passage. It becomes like this.

また、上記のシリンダヘッドにおいては、ウォータージャケットの少なくとも一部をＥＧＲ通路よりも鉛直方向上側に設けることが好ましい。この場合、ＥＧＲ通路内を流れるＥＧＲガスが流入部領域よりもウォータージャケットに近い流出部領域に集まるようになるため、ＥＧＲ通路でのＥＧＲガスの冷却効率を向上させることができるようになる。   In the cylinder head, it is preferable that at least a part of the water jacket is provided on the upper side in the vertical direction with respect to the EGR passage. In this case, since the EGR gas flowing in the EGR passage is collected in the outflow region closer to the water jacket than in the inflow region, the cooling efficiency of the EGR gas in the EGR passage can be improved.

第１の実施形態のシリンダヘッドを備える内燃機関の一部を模式的に示す側面図。The side view which shows typically a part of internal combustion engine provided with the cylinder head of 1st Embodiment. 第１の実施形態のシリンダヘッド内に設けられているＥＧＲ通路を模式的に示す一部断面図。The partial cross section figure which shows typically the EGR channel | path provided in the cylinder head of 1st Embodiment. 図２における３−３線で切断した場合のＥＧＲ通路の断面形状を示す模式図。The schematic diagram which shows the cross-sectional shape of an EGR channel | path at the time of cut | disconnecting by the 3-3 line in FIG. 第１の実施形態のシリンダヘッドに設けられているＥＧＲ通路内をＥＧＲガスが流れる様子を模式的に示す作用図。FIG. 5 is an operation diagram schematically showing how EGR gas flows in an EGR passage provided in the cylinder head of the first embodiment. 第２の実施形態のシリンダヘッドに設けられているＥＧＲ通路内をＥＧＲガスが流れる様子を示す作用図。The action figure which shows a mode that EGR gas flows through the inside of the EGR channel | path provided in the cylinder head of 2nd Embodiment. （ａ）は図５における６ａ−６ａ線で切断した場合のＥＧＲ通路の断面形状を示す模式図、（ｂ）は図５における６ｂ−６ｂ線で切断した場合のＥＧＲ通路の断面形状を示す模式図、（ｃ）は図５における６ｃ−６ｃ線で切断した場合のＥＧＲ通路の断面形状を示す模式図。(A) is a schematic diagram showing a cross-sectional shape of the EGR passage when cut along line 6a-6a in FIG. 5, (b) is a schematic diagram showing a cross-sectional shape of the EGR passage when cut along line 6b-6b in FIG. The figure, (c) is a schematic diagram which shows the cross-sectional shape of the EGR passage at the time of cut | disconnecting by the 6c-6c line | wire in FIG. 別の実施形態のシリンダヘッドに設けられているＥＧＲ通路の断面形状を示す模式図。The schematic diagram which shows the cross-sectional shape of the EGR channel | path provided in the cylinder head of another embodiment. （ａ）〜（ｃ）は、別の実施形態のシリンダヘッドに設けられているＥＧＲ通路の通路断面積が次第に変化する様子を示す模式図。(A)-(c) is a schematic diagram which shows a mode that the passage cross-sectional area of the EGR passage provided in the cylinder head of another embodiment changes gradually.

（第１の実施形態）
以下、内部にＥＧＲ通路が設けられたシリンダヘッドを具体化した第１の実施形態を図１〜図４に従って説明する。 (First embodiment)
Hereinafter, a first embodiment in which a cylinder head having an EGR passage provided therein is embodied will be described with reference to FIGS.

図１に示すように、内燃機関１１はエンジンルーム内で傾斜した状態で配置されており、燃焼室１２に吸入空気を供給する吸気系２０は、燃焼室１２で発生した排気を排出する排気系３０よりも上方に位置している。そして、シリンダブロック１３の上部に組み付けられているシリンダヘッド１４には吸気系２０を構成する吸気管２１が接続されており、この吸気管２１を流れる吸入空気はシリンダヘッド１４に設けられている吸気ポート２２を通じて燃焼室１２に導入される。また、シリンダヘッド１４には、排気系３０を構成する排気管３１が接続されており、この排気管３１にはシリンダヘッド１４に設けられている排気ポート３２を通じて燃焼室１２で発生した排気が排出される。   As shown in FIG. 1, the internal combustion engine 11 is disposed in an inclined state in the engine room, and an intake system 20 that supplies intake air to the combustion chamber 12 is an exhaust system that discharges exhaust generated in the combustion chamber 12. It is located above 30. An intake pipe 21 constituting an intake system 20 is connected to the cylinder head 14 assembled on the upper portion of the cylinder block 13, and intake air flowing through the intake pipe 21 is intake air provided in the cylinder head 14. It is introduced into the combustion chamber 12 through the port 22. In addition, an exhaust pipe 31 constituting an exhaust system 30 is connected to the cylinder head 14, and exhaust gas generated in the combustion chamber 12 is exhausted to the exhaust pipe 31 through an exhaust port 32 provided in the cylinder head 14. Is done.

本実施形態の内燃機関１１は、排気管３１を流れる排気の一部をＥＧＲガスとして吸気管２１に還流させる排気還流装置４０を備えている。なお、ＥＧＲは、「Exhaust Gas Recirculation」の略記である。   The internal combustion engine 11 of the present embodiment includes an exhaust gas recirculation device 40 that recirculates a part of the exhaust gas flowing through the exhaust pipe 31 to the intake pipe 21 as EGR gas. EGR is an abbreviation for “Exhaust Gas Recirculation”.

排気還流装置４０を構成する還流通路４１は、排気管３１に接続される上流側還流管４２と、シリンダヘッド１４内に設けられているＥＧＲ通路４３と、吸気管２１に接続される下流側還流管４４とを備えている。上流側還流管４２の上流端は排気管３１に接続され、上流側還流管４２の下流端はシリンダヘッド１４に接続されている。また、下流側還流管４４の上流端はシリンダヘッド１４に接続され、下流側還流管４４の下流端は吸気管２１に接続されている。そして、排気管３１から上流側還流管４２に流入した排気は、ＥＧＲガスとしてＥＧＲ通路４３及び下流側還流管４４を通じて吸気管２１内に流入する。   A reflux passage 41 constituting the exhaust gas recirculation device 40 includes an upstream reflux pipe 42 connected to the exhaust pipe 31, an EGR passage 43 provided in the cylinder head 14, and a downstream reflux connected to the intake pipe 21. A tube 44. The upstream end of the upstream reflux pipe 42 is connected to the exhaust pipe 31, and the downstream end of the upstream reflux pipe 42 is connected to the cylinder head 14. The upstream end of the downstream reflux pipe 44 is connected to the cylinder head 14, and the downstream end of the downstream reflux pipe 44 is connected to the intake pipe 21. Then, the exhaust gas flowing into the upstream reflux pipe 42 from the exhaust pipe 31 flows into the intake pipe 21 through the EGR passage 43 and the downstream reflux pipe 44 as EGR gas.

なお、シリンダヘッド１４内には、冷却水が流れるウォータージャケット１５が設けられており、このウォータージャケット１５は、ＥＧＲ通路４３を挟んでシリンダブロック１３の反対側、すなわちＥＧＲ通路４３よりも鉛直方向上側に位置している。そして、還流通路４１を流れるＥＧＲガスは、ＥＧＲ通路４３を通過する際にウォータージャケット１５を流れる冷却水の冷却効果によって冷却される。   A water jacket 15 through which cooling water flows is provided in the cylinder head 14, and the water jacket 15 is on the opposite side of the cylinder block 13 across the EGR passage 43, that is, above the EGR passage 43 in the vertical direction. Is located. The EGR gas flowing through the reflux passage 41 is cooled by the cooling effect of the cooling water flowing through the water jacket 15 when passing through the EGR passage 43.

次に、図１〜図３を参照して、ＥＧＲ通路４３について詳述する。なお、本実施形態では、ＥＧＲ通路４３の延伸方向を「第１の方向」といい、この第１の方向と直交する方向であって且つ図示しないピストンの往復動する方向を「第２の方向」といい、第１の方向及び第２の方向に直交する方向、すなわち各気筒の配列方向を「第３の方向」というものとする。   Next, the EGR passage 43 will be described in detail with reference to FIGS. In the present embodiment, the extending direction of the EGR passage 43 is referred to as a “first direction”, and the direction that is orthogonal to the first direction and in which a piston (not shown) reciprocates is referred to as a “second direction”. The direction orthogonal to the first direction and the second direction, that is, the arrangement direction of each cylinder is referred to as a “third direction”.

図１及び図２に示すように、ＥＧＲ通路４３は、内燃機関１１がエンジンルーム内に設置された状態では上流端から上斜め上方に延伸している。そのため、ＥＧＲ通路４３にあっては、下流端が上流端よりも鉛直方向上側に位置している。そして、ＥＧＲ通路４３の上流端には上流側還流管４２が接続される流入部４３ＩＮが設けられ、ＥＧＲ通路４３の下流端には下流側還流管４４が接続される流出部４３ＯＵＴが設けられている。   As shown in FIGS. 1 and 2, the EGR passage 43 extends obliquely upward and upward from the upstream end when the internal combustion engine 11 is installed in the engine room. Therefore, in the EGR passage 43, the downstream end is positioned above the upstream end in the vertical direction. The upstream end of the EGR passage 43 is provided with an inflow portion 43IN to which the upstream side reflux pipe 42 is connected, and the downstream end of the EGR passage 43 is provided with an outflow portion 43OUT to which the downstream side reflux pipe 44 is connected. Yes.

ここで、図２においてＥＧＲ通路４３の第２の方向における中心を通過する線を「中心線Ｓ」とする。この場合、流入部４３ＩＮは、中心線Ｓよりもウォータージャケット１５から離れた位置であって且つ流出部４３ＯＵＴよりも鉛直方向下側となる位置に配置されている。その一方で、流入部４３ＩＮは、中心線Ｓよりもウォータージャケット１５に近い位置であって且つ流入部４３ＩＮよりも鉛直方向上側となる位置に配置されている。したがって、本実施形態では、第２の方向が「規定方向」に相当する。   Here, the line passing through the center of the EGR passage 43 in the second direction in FIG. In this case, the inflow portion 43IN is disposed at a position farther from the water jacket 15 than the center line S and at a lower position in the vertical direction than the outflow portion 43OUT. On the other hand, the inflow portion 43IN is disposed at a position closer to the water jacket 15 than the center line S and on the upper side in the vertical direction from the inflow portion 43IN. Therefore, in the present embodiment, the second direction corresponds to the “specified direction”.

こうしたＥＧＲ通路４３は、流入部４３ＩＮから離れるに連れて次第に第２の方向におけるウォータージャケット１５側に通路断面積が広がる拡大部４３１と、流出部４３ＯＵＴに近づくに連れて次第に通路断面積が狭くなる縮小部４３２とを有している。なお、ＥＧＲ通路４３における拡大部４３１と縮小部４３２との間の部分を、中央部４３３というものとする。   The EGR passage 43 has an enlarged portion 431 in which the passage cross-sectional area gradually increases toward the water jacket 15 in the second direction as it moves away from the inflow portion 43IN, and the passage cross-sectional area gradually decreases as it approaches the outflow portion 43OUT. A reduction unit 432. A portion between the enlarged portion 431 and the reduced portion 432 in the EGR passage 43 is referred to as a central portion 433.

図３に示すように、中央部４３３内には、複数の区画壁４５１が第３の方向に並ぶようにして設けられている。これにより、中央部４３３には、第３の方向に並ぶ複数の区画通路４５が形成されている。   As shown in FIG. 3, a plurality of partition walls 451 are provided in the central portion 433 so as to be arranged in the third direction. Thereby, a plurality of partition passages 45 arranged in the third direction are formed in the central portion 433.

こうした区画通路４５の第２の方向における中心（図３にて一点鎖線で示す。）よりも流入部側（図３では下側）を流入部領域４６とし、第２の方向における中心よりも流出部側（図３では上側）を流出部領域４７とする。この場合、流出部領域４７の通路断面積が、流入部領域４６の通路断面積よりも広くなっている。本実施形態では、区画通路４５の幅（すなわち、第３の方向における長さ）は、第２の方向においてウォータージャケット１５に向かうに連れて次第に広くなっている。   The inflow part side (lower side in FIG. 3) is the inflow part region 46 from the center in the second direction of the partition passage 45 (indicated by a one-dot chain line in FIG. 3), and the outflow from the center in the second direction. The part side (upper side in FIG. 3) is defined as an outflow part region 47. In this case, the passage cross-sectional area of the outflow region 47 is wider than the passage cross-sectional area of the inflow region 46. In the present embodiment, the width of the partition passage 45 (that is, the length in the third direction) gradually becomes wider toward the water jacket 15 in the second direction.

次に、図４を参照して、ＥＧＲガスがＥＧＲ通路４３を流れる際の作用について説明する。
図４に示すように、流入部４３ＩＮを通じてＥＧＲ通路４３に流入したＥＧＲガスは、拡大部４３１を通過した後、中央部４３３の各区画通路４５内を流れることとなる。このとき、流出部領域４７の通路断面積が流入部領域４６の通路断面積よりも広いため、区画通路４５内においては、ＥＧＲガスが流入部領域４６よりも流出部領域４７に流れやすい。すなわち、区画通路４５内に流入したＥＧＲガスは、図４にて矢印で示すように、比較的早期に流出部領域４７内を流出部４３ＯＵＴに向けて流れるようになる。 Next, with reference to FIG. 4, an operation when EGR gas flows through the EGR passage 43 will be described.
As shown in FIG. 4, the EGR gas that has flowed into the EGR passage 43 through the inflow portion 43 </ b> IN flows through the partition passages 45 in the central portion 433 after passing through the enlarged portion 431. At this time, the passage cross-sectional area of the outflow region 47 is larger than the cross-sectional area of the inflow region 46, so that EGR gas flows more easily in the outflow region 47 than in the inflow region 46 in the partition passage 45. That is, the EGR gas that has flowed into the partition passage 45 flows in the outflow portion region 47 toward the outflow portion 43OUT relatively early as indicated by an arrow in FIG.

以上説明した構成や作用により、本実施形態では、以下に示す効果を得ることができる。
（１）流入部４３ＩＮを通じてＥＧＲ通路４３内に流入したＥＧＲガスは、流入部領域４６よりも通路断面積の広い流出部領域４７に流れやすくなる。すなわち、ＥＧＲ通路４３内では、流入部４３ＩＮから流出部４３ＯＵＴへのＥＧＲガスの流れが形成されやすくなる。そのため、流入部４３ＩＮを通じてＥＧＲ通路４３内に流入したＥＧＲガスを、流出部４３ＯＵＴからＥＧＲ通路４３外に円滑に流出させ、ＥＧＲ通路４３をＥＧＲガスが通過する際における圧力損失を低減させることができるようになる。 With the configuration and operation described above, in the present embodiment, the following effects can be obtained.
(1) EGR gas that has flowed into the EGR passage 43 through the inflow portion 43IN is likely to flow into the outflow portion region 47 having a larger passage cross-sectional area than the inflow portion region 46. That is, in the EGR passage 43, an EGR gas flow from the inflow portion 43IN to the outflow portion 43OUT is easily formed. Therefore, the EGR gas that has flowed into the EGR passage 43 through the inflow portion 43IN can smoothly flow out of the EGR passage 43 from the outflow portion 43OUT, and the pressure loss when the EGR gas passes through the EGR passage 43 can be reduced. It becomes like this.

（２）本実施形態では、流出部４３ＯＵＴが流入部４３ＩＮよりも鉛直方向上側に位置するようにＥＧＲ通路４３が構成されているため、ＥＧＲ通路４３内で発生した凝縮水が上方に位置する流出部４３ＯＵＴからは排出されにくくなる一方、下方に位置する流入部４３ＩＮを介してＥＧＲ通路４３外に排出されやすくなる。そのため、ＥＧＲガスとともに凝縮水が燃焼室１２に導入されることを抑制するとともに、凝縮水を流入部４３ＩＮから排出し、ＥＧＲ通路４３内に凝縮水が滞留することによる内壁の腐食を抑制することができるようになる。   (2) In the present embodiment, since the EGR passage 43 is configured such that the outflow portion 43OUT is positioned above the inflow portion 43IN in the vertical direction, the condensed water generated in the EGR passage 43 is located above. While being difficult to be discharged from the portion 43OUT, it is likely to be discharged out of the EGR passage 43 via the inflow portion 43IN positioned below. Therefore, the condensate is prevented from being introduced into the combustion chamber 12 together with the EGR gas, and the condensate is discharged from the inflow portion 43IN, and the inner wall is prevented from corroding due to the condensate remaining in the EGR passage 43. Will be able to.

（３）また、ＥＧＲ通路４３の中央部４３３においては、流出部領域４７の通路断面積のほうが流入部領域４６の通路断面積よりも広い。すなわち、中央部４３３では、ウォータージャケット１５に近い流出部領域４７におけるＥＧＲガスの流量が、ウォータージャケット１５から離れている流入部領域４６におけるＥＧＲガスの流量よりも多くなる。そのため、流入部領域４６の通路断面積が流出部領域４７と同等である場合と比較して、ＥＧＲ通路４３でのＥＧＲガスの冷却効率を向上させることができるようになる。   (3) Further, in the central portion 433 of the EGR passage 43, the passage sectional area of the outflow region 47 is wider than the passage sectional area of the inflow region 46. That is, in the central portion 433, the flow rate of EGR gas in the outflow region 47 close to the water jacket 15 is larger than the flow rate of EGR gas in the inflow region 46 away from the water jacket 15. Therefore, the cooling efficiency of the EGR gas in the EGR passage 43 can be improved as compared with the case where the passage sectional area of the inflow portion region 46 is equal to that of the outflow portion region 47.

（第２の実施形態）
次に、シリンダヘッド１４に設けられるＥＧＲ通路の第２の実施形態を図５及び図６に従って説明する。なお、第２の実施形態は、ＥＧＲ通路の中央部の形状が第１の実施形態と異なっている。したがって、以下の説明においては、第１の実施形態と相違する部分について主に説明するものとし、第１の実施形態と同一の部材構成には同一符号を付して重複説明を省略するものとする。 (Second Embodiment)
Next, a second embodiment of the EGR passage provided in the cylinder head 14 will be described with reference to FIGS. The second embodiment is different from the first embodiment in the shape of the central portion of the EGR passage. Therefore, in the following description, parts different from those of the first embodiment will be mainly described, and the same member configuration as that of the first embodiment will be denoted by the same reference numerals and redundant description will be omitted. To do.

図５に示すように、ＥＧＲ通路４３Ａは、内燃機関１１がエンジンルーム内に設置された状態では上流端から上斜め上方に延伸している。こうしたＥＧＲ通路４３Ａは、上記第１の実施形態と同様に、流入部４３ＩＮ、拡大部４３１、中央部４３３Ａ、縮小部４３２、流出部４３ＯＵＴを有している。なお、流入部４３ＩＮは中心線Ｓよりもウォータージャケット１５から離れた位置に設けられるとともに、流出部４３ＯＵＴは中心線Ｓよりもウォータージャケット１５に近い位置に設けられている。   As shown in FIG. 5, the EGR passage 43A extends upward and obliquely upward from the upstream end when the internal combustion engine 11 is installed in the engine room. Similar to the first embodiment, the EGR passage 43A has an inflow portion 43IN, an enlarged portion 431, a central portion 433A, a reduced portion 432, and an outflow portion 43OUT. The inflow portion 43IN is provided at a position farther from the water jacket 15 than the center line S, and the outflow portion 43OUT is provided at a position closer to the water jacket 15 than the center line S.

図６（ａ），（ｂ），（ｃ）に示すように、こうしたＥＧＲ通路４３Ａの中央部４３３Ａの通路断面積は、流出部４３ＯＵＴに近づくに連れて変化している。すなわち、第２の方向における中央よりもウォータージャケット１５から離れた側の流入部領域４６Ａの通路断面積は一定であるものの、第２の方向における中央よりもウォータージャケット１５に近い側の流出部領域４７Ａの通路断面積は、流出部４３ＯＵＴに近づくに連れて次第に広くなっている。   As shown in FIGS. 6A, 6B, and 6C, the passage cross-sectional area of the central portion 433A of the EGR passage 43A changes as it approaches the outflow portion 43OUT. That is, the passage cross-sectional area of the inflow region 46A on the side farther from the water jacket 15 than the center in the second direction is constant, but the outflow region on the side closer to the water jacket 15 than the center in the second direction. The passage cross-sectional area of 47A gradually increases as it approaches the outflow portion 43OUT.

次に、ＥＧＲガスがＥＧＲ通路４３を流れる際の作用について説明する。
流入部４３ＩＮを通じてＥＧＲ通路４３Ａに流入したＥＧＲガスは、区画通路４５に流入した直後では区画通路４５全体に広がる。そして、流出部４３ＯＵＴに近づくに連れて流出部領域４７Ａの通路断面積が広くなるため、図５にて矢印で示すように区画通路４５を流れるＥＧＲガスのうち流入部領域４６Ａ内を流れるＥＧＲガスは次第に流出部領域４７Ａに集まるようになる。そして、各区画通路４５を流れたＥＧＲガスは、縮小部４３２で合流した後に流出部４３ＯＵＴを通じて下流側還流管４４内に流出される。 Next, the operation when EGR gas flows through the EGR passage 43 will be described.
The EGR gas that has flowed into the EGR passage 43 </ b> A through the inflow portion 43 </ b> IN spreads throughout the partition passage 45 immediately after flowing into the partition passage 45. And since the passage cross-sectional area of the outflow portion region 47A becomes wider as it approaches the outflow portion 43OUT, the EGR gas flowing in the inflow portion region 46A among the EGR gas flowing through the partition passage 45 as shown by the arrows in FIG. Gradually gather in the outflow region 47A. Then, the EGR gas that has flowed through each of the partition passages 45 merges in the reduction unit 432 and then flows out into the downstream reflux pipe 44 through the outflow unit 43OUT.

以上説明した構成や作用により、本実施形態では、上記第１の実施形態における効果（１）〜（３）と同等の効果に加え、以下に示す効果をさらに得ることができる。
（４）流出部領域４７Ａの通路断面積が流出部４３ＯＵＴに近づくに連れて次第に広くなっているため、流入部４３ＩＮからＥＧＲ通路４３Ａ内に流入したＥＧＲガスは、徐々に流入部領域４６Ａから流出部領域４７Ａへと流れやすくなる。したがって、ＥＧＲガスがＥＧＲ通路４３Ａに流入した直後においては、ＥＧＲガスをＥＧＲ通路４３Ａ全体に行き渡らせてウォータージャケット１５を流れる冷却水との熱交換を促進させることができる。その一方で、徐々に流出部４３ＯＵＴに向かうＥＧＲガスの流れを形成することもでき、ＥＧＲ通路４３ＡをＥＧＲガスが通過する際における圧力損失を低減させるとともに、ＥＧＲガスの冷却効率を向上させることができるようになる。 With the configuration and operation described above, in this embodiment, in addition to the effects equivalent to the effects (1) to (3) in the first embodiment, the following effects can be further obtained.
(4) Since the passage cross-sectional area of the outflow portion area 47A gradually increases as it approaches the outflow portion 43OUT, the EGR gas that has flowed into the EGR passage 43A from the inflow portion 43IN gradually flows out of the inflow portion region 46A. It becomes easy to flow to the partial area 47A. Therefore, immediately after the EGR gas flows into the EGR passage 43A, it is possible to promote the heat exchange with the cooling water flowing through the water jacket 15 by spreading the EGR gas over the entire EGR passage 43A. On the other hand, the flow of EGR gas toward the outflow part 43OUT can also be formed gradually, reducing the pressure loss when the EGR gas passes through the EGR passage 43A and improving the cooling efficiency of the EGR gas. become able to.

なお、上記各実施形態は以下のような別の実施形態に変更してもよい。
・流出部領域の通路断面積が流入部領域の通路断面積よりも広くなっていれば、流入部から流出部への流れが形成されやすくなるため、流出部領域の通路断面積が流入部領域の通路断面積よりも広くなっていれば各区画通路の断面形状は適宜変更することができる。例えば、図７に示すように、ＥＧＲ通路の中央部４３３Ｂの区画通路４５は、流入部領域４６Ｂの幅が第１の幅で一定であって、且つ流出部領域４７Ｂの幅が第１の幅よりも広い第２の幅で一定となる形状であってもよい。 In addition, you may change each said embodiment into another embodiment as follows.
・ If the cross-sectional area of the outflow region is larger than the cross-sectional area of the inflow region, a flow from the inflow portion to the outflow portion is likely to be formed. If the cross-sectional area is larger than the cross-sectional area, the sectional shape of each partition passage can be changed as appropriate. For example, as shown in FIG. 7, in the partition passage 45 of the central portion 433B of the EGR passage, the width of the inflow portion region 46B is constant at the first width, and the width of the outflow portion region 47B is the first width. The shape may be constant with a wider second width.

・図８（ａ），（ｂ），（ｃ）に示すように、ＥＧＲ通路の中央部４３３Ｃの流入部領域４６Ｃの通路断面積を流出部４３ＯＵＴに近づくに連れて次第に狭くするようにしてもよい。この場合、流出部領域４７Ｃの通路断面積を、一定としてもよいし、流出部４３ＯＵＴに近づくに連れて次第に広くしてもよい。このように構成しても、流出部領域の通路断面積が流入部領域の通路断面積よりも広くなるため、上記（１）〜（４）と同等の効果を得ることができる。   As shown in FIGS. 8A, 8B, and 8C, the passage cross-sectional area of the inflow portion region 46C of the central portion 433C of the EGR passage may be gradually narrowed as it approaches the outflow portion 43OUT. Good. In this case, the passage cross-sectional area of the outflow portion region 47C may be constant, or may gradually increase as the outflow portion 43OUT is approached. Even if comprised in this way, since the passage cross-sectional area of an outflow part area | region becomes wider than the passage cross-sectional area of an inflow part area | region, the effect equivalent to said (1)-(4) can be acquired.

・内燃機関１１がエンジンルーム内に設置された状態で、ＥＧＲ通路４３，４３Ａは、鉛直方向と直交する水平方向に延伸する形状であってもよいし、上流端から下斜め下方に延伸する形状であってもよい。ＥＧＲ通路がこうした形状であっても、流入部４３ＩＮと流出部４３ＯＵＴを第２の方向でずれた位置に設け、流出部領域の通路断面積を流入部領域の通路断面積よりも広くすることにより、上記（１）と同等の効果を得ることができる。   In a state where the internal combustion engine 11 is installed in the engine room, the EGR passages 43 and 43A may have a shape that extends in a horizontal direction perpendicular to the vertical direction, or a shape that extends downward and obliquely downward from the upstream end. It may be. Even if the EGR passage has such a shape, the inflow portion 43IN and the outflow portion 43OUT are provided at positions shifted in the second direction, and the passage cross-sectional area of the outflow portion region is made wider than the passage cross-sectional area of the inflow portion region. The effect equivalent to the above (1) can be obtained.

・上記各実施形態では、ウォータージャケットがＥＧＲ通路よりも上方に設けられている例を開示したが、ＥＧＲ通路を流れるＥＧＲガスを冷却することのできる形状であればウォータージャケットの形状は適宜変更することができる。なお、ウォータージャケットの一部がＥＧＲ通路よりも上方に設けられていれば、上記（３）と同様の効果を得ることができる。   In each of the above embodiments, an example in which the water jacket is provided above the EGR passage has been disclosed. However, the shape of the water jacket is appropriately changed as long as the EGR gas flowing through the EGR passage can be cooled. be able to. If a part of the water jacket is provided above the EGR passage, the same effect as the above (3) can be obtained.

・上記各実施形態では、流入部と流出部とを上下方向にずらした例を開示した。これに対して、流入部と流出部とが他の方向にずれている場合であっても、流出部領域の通路断面積を流入部領域の通路断面積よりも広くすれば、上記実施形態と同様に流入部から流出部への流れを形成することができる。例えば、流入部４３ＩＮ及び流出部４３ＯＵＴは、第３の方向で互いにずれた位置に設けてもよい。この場合、ＥＧＲ通路において第３の方向における流入部側の領域を流入部領域とし、第３の方向における流出部側の領域を流出部領域としたとき、流出部領域の通路断面積を流入部領域の通路断面積よりも広くすることとなる。こうした構成であっても、上記（１）と同等の効果を得ることができる。   In each of the above embodiments, an example in which the inflow portion and the outflow portion are shifted in the vertical direction has been disclosed. On the other hand, even if the inflow portion and the outflow portion are displaced in other directions, if the passage cross-sectional area of the outflow portion region is made larger than the passage cross-sectional area of the inflow portion region, Similarly, a flow from the inflow portion to the outflow portion can be formed. For example, the inflow portion 43IN and the outflow portion 43OUT may be provided at positions shifted from each other in the third direction. In this case, in the EGR passage, when the region on the inflow portion side in the third direction is the inflow portion region and the region on the outflow portion side in the third direction is the outflow portion region, the passage cross-sectional area of the outflow portion region is the inflow portion. It will be wider than the cross-sectional area of the region. Even if it is such a structure, the effect equivalent to said (1) can be acquired.

１４…シリンダヘッド、１５…ウォータージャケット、４３，４３Ａ…ＥＧＲ通路、４３ＩＮ…流入部、４３ＯＵＴ…流出部、４６，４６Ａ〜４６Ｃ…流入部領域、４７，４７Ａ〜４７Ｃ…流出部領域。   DESCRIPTION OF SYMBOLS 14 ... Cylinder head, 15 ... Water jacket, 43, 43A ... EGR passage, 43IN ... Inflow part, 43OUT ... Outflow part, 46, 46A-46C ... Inflow part area | region, 47, 47A-47C ... Outflow part area | region.

Claims (5)

ＥＧＲ通路とウォータージャケットとが内部に設けられてなるシリンダヘッドであって、
前記ＥＧＲ通路の一端にはＥＧＲガスの流入部が設けられ、同ＥＧＲ通路の他端にはＥＧＲガスの流出部が設けられ、前記流入部及び前記流出部は前記ＥＧＲ通路の延伸方向と直交する規定方向で互いにずれており、
前記ＥＧＲ通路の前記規定方向における前記流出部側の領域を流出部領域とし、前記ＥＧＲ通路の前記規定方向における前記流入部側の領域を流入部領域としたとき、前記流出部領域の通路断面積を前記流入部領域の通路断面積よりも広くしてなる
ことを特徴とするシリンダヘッド。 A cylinder head in which an EGR passage and a water jacket are provided;
An EGR gas inflow portion is provided at one end of the EGR passage, an EGR gas outflow portion is provided at the other end of the EGR passage, and the inflow portion and the outflow portion are orthogonal to the extending direction of the EGR passage. They are offset from each other in the specified direction,
When the region on the outflow portion side in the prescribed direction of the EGR passage is an outflow portion region and the region on the inflow portion side in the prescribed direction of the EGR passage is an inflow portion region, the passage sectional area of the outflow portion region The cylinder head is characterized in that it is made wider than the passage cross-sectional area of the inflow portion region. 前記流出部領域の通路断面積を、前記ＥＧＲ通路の延伸方向において前記流出部に近づくに連れて広くしてなる
請求項１に記載のシリンダヘッド。 2. The cylinder head according to claim 1, wherein a passage cross-sectional area of the outflow portion region is widened as approaching the outflow portion in the extending direction of the EGR passage. 前記流入部領域の通路断面積を、前記ＥＧＲ通路の延伸方向において前記流出部に近づくに連れて狭くしてなる
請求項１又は請求項２に記載のシリンダヘッド。 3. The cylinder head according to claim 1, wherein a passage cross-sectional area of the inflow portion region is narrowed as approaching the outflow portion in the extending direction of the EGR passage. 前記流入部と前記流出部が鉛直方向上下にずれた位置に設けられ、前記流出部が前記流入部よりも鉛直方向上側に位置しており、
前記流入部領域よりも鉛直方向上側に位置する前記流出部領域の通路断面積を前記流入部領域の通路断面積よりも広くしてなる
請求項１〜請求項３のうち何れか一項に記載のシリンダヘッド。 The inflow portion and the outflow portion are provided at positions shifted vertically up and down, and the outflow portion is positioned above the inflow portion in the vertical direction,
4. The passage cross-sectional area of the outflow region located vertically above the inflow portion region is made wider than the cross-sectional area of the inflow portion region. 5. Cylinder head. 前記ウォータージャケットの少なくとも一部が、前記ＥＧＲ通路よりも鉛直方向上側に設けられてなる
請求項４に記載のシリンダヘッド。 The cylinder head according to claim 4, wherein at least a part of the water jacket is provided vertically above the EGR passage.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968172U (en) * 1982-10-30 1984-05-09 いすゞ自動車株式会社 Internal combustion engine exhaust gas recirculation passage
JPH01111165U (en) * 1988-01-18 1989-07-26
JP2012172554A (en) * 2011-02-18 2012-09-10 Toyota Motor Corp Cylinder head including egr passage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5968172U (en) * 1982-10-30 1984-05-09 いすゞ自動車株式会社 Internal combustion engine exhaust gas recirculation passage
JPH01111165U (en) * 1988-01-18 1989-07-26
JP2012172554A (en) * 2011-02-18 2012-09-10 Toyota Motor Corp Cylinder head including egr passage

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