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JP2009002265A - Internal combustion engine cooling structure - Google Patents

Internal combustion engine cooling structure Download PDF

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Publication number
JP2009002265A
JP2009002265A JP2007165058A JP2007165058A JP2009002265A JP 2009002265 A JP2009002265 A JP 2009002265A JP 2007165058 A JP2007165058 A JP 2007165058A JP 2007165058 A JP2007165058 A JP 2007165058A JP 2009002265 A JP2009002265 A JP 2009002265A
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Japan
Prior art keywords
cooling water
exhaust
wall surface
side wall
cylinder head
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JP2007165058A
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Japanese (ja)
Inventor
Yukio Koseki
優紀夫 小関
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Toyota Motor Corp
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Toyota Motor Corp
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Priority to JP2007165058A priority Critical patent/JP2009002265A/en
Priority to US12/143,235 priority patent/US20080314339A1/en
Publication of JP2009002265A publication Critical patent/JP2009002265A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/243—Cylinder heads and inlet or exhaust manifolds integrally cast together
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4264—Shape or arrangement of intake or exhaust channels in cylinder heads of exhaust channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/02—Arrangements for cooling cylinders or cylinder heads
    • F01P2003/028—Cooling cylinders and cylinder heads in series

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To favorably cool the surrounding area of an inlet valve, an inlet port, an exhaust valve and an exhaust port. <P>SOLUTION: The exhaust port 11 and an exhaust collector part 14 are formed inside a cylinder head 3. A main channel of cooling water flowing around the intake valve 8 and the intake port 9 crosswise toward one side wall surface 12 of the cylinder head 3 after flowing in the surrounding area of the exhaust valve 10 inside the cylinder head 3 from the inside of a cylinder block 2 and flowing out inside the cylinder block is formed in the inside of an engine main body 1. A part of the cooling water flowing in around the exhaust valve 10 is made to flow crosswise toward the other side wall surface 13 of the cylinder head 3 through the surrounding area of the exhaust port 11, and then this cooling water is made to flow toward a cooling water outlet 28 along the other side wall surface 13. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は内燃機関の冷却構造に関する。   The present invention relates to a cooling structure for an internal combustion engine.

内燃機関ではシリンダヘッド内において排気弁周りや点火栓周りの温度が特に高くなり、従ってこれら排気弁周りや点火栓周りを強力に冷却する必要がある。そこで機関本体の長手軸線に沿って直列に配置された複数の気筒を具備しており、この長手軸線の一側に吸気弁および吸気ポートが配置され、この長手軸線の他側に排気弁および排気ポートが配置された多気筒内燃機関において、シリンダブロック内に形成されされたウォータジャケットが上述の長手軸線に関して互いに反対側に位置する吸気ポート側ウォータジャケットと排気ポート側ウォータジャケットとに分割されており、排気ポート側ウォータジャケット内の冷却水を排気弁および点火栓周りのシリンダヘッド内に流入させて排気弁および点火栓周りを冷却し、次いでこの冷却水をシリンダヘッド内において吸気弁および吸気ポート周りを横方向に、即ち上述の長手軸線と直交する方向に流通させた後に吸気ポート側ウォータジャケット内に流出させるようにした内燃機関が公知である（特許文献１を参照）。
実公平５−１７３７３号公報 In an internal combustion engine, the temperature around the exhaust valve and the spark plug is particularly high in the cylinder head, and therefore it is necessary to cool the area around the exhaust valve and the spark plug. Therefore, the engine has a plurality of cylinders arranged in series along the longitudinal axis of the engine body, an intake valve and an intake port are arranged on one side of the longitudinal axis, and an exhaust valve and an exhaust are arranged on the other side of the longitudinal axis. In a multi-cylinder internal combustion engine in which ports are arranged, a water jacket formed in a cylinder block is divided into an intake port side water jacket and an exhaust port side water jacket positioned on opposite sides with respect to the longitudinal axis. The cooling water in the exhaust port side water jacket is caused to flow into the cylinder head around the exhaust valve and the spark plug to cool the exhaust valve and the spark plug, and then the cooling water is supplied around the intake valve and the intake port in the cylinder head. After passing in the horizontal direction, that is, in the direction perpendicular to the longitudinal axis, the intake port side water jacket Internal combustion engine so as to flow out are known in the preparative (see Patent Document 1).
Japanese Utility Model Publication No. 5-17373

しかしながらこの内燃機関では高温となる排気ポート周りを十分に冷却することができないという問題がある。   However, this internal combustion engine has a problem in that it cannot sufficiently cool around the exhaust port that becomes high temperature.

上記問題を解決するために本発明によれば、機関本体の長手軸線に沿って直列に配置された複数の気筒を具備しており、この長手軸線に関し吸気弁が配置されている側のシリンダヘッドの一方の側壁面上において吸気ポートを開口させると共に、この長手軸線に関し排気弁が配置されている側のシリンダヘッドの他方の側壁面上において排気ポートを開口させるようにした内燃機関において、シリンダブロック内からシリンダヘッド内の排気弁周りに流入した後、吸気弁および吸気ポート周りを一方の側壁面に向け横方向に流れてシリンダブロック内に流出する冷却水の主流路を機関本体内に形成し、シリンダブロック内からシリンダヘッド内の排気弁周りに流入した冷却水の一部を主流路に沿い流れる冷却水とは反対方向に排気ポートの周りを他方の側壁面に向け横方向に流通させた後、他方の側壁面に沿って上述長手軸線方向に機関本体からの冷却水出口に向け流通させるようにしている。   In order to solve the above problem, according to the present invention, a cylinder head on the side where an intake valve is arranged with respect to the longitudinal axis is provided with a plurality of cylinders arranged in series along the longitudinal axis of the engine body. An internal combustion engine in which an intake port is opened on one side wall surface of the cylinder and an exhaust port is opened on the other side wall surface of the cylinder head on the side where the exhaust valve is disposed with respect to the longitudinal axis. A main flow path of cooling water that flows into the cylinder block from the inside and then flows laterally around the intake valve and the intake port toward one side wall surface and flows into the cylinder block is formed in the engine body. , A part of the cooling water flowing from the cylinder block around the exhaust valve in the cylinder head in the direction opposite to the cooling water flowing along the main flow path After allowed to flow laterally toward the other side wall surface, so that circulating toward the cooling water outlet from the engine body above the longitudinal axis direction along the other side wall surface.

排気弁周りに流入した冷却水の一部を排気ポート周りに横方向に流通させた後、機関本体からの冷却水出口に向け機関本体の長手軸線方向に流通させることによって排気ポート周りを十分に冷却することができる。   A part of the cooling water flowing around the exhaust valve is circulated in the lateral direction around the exhaust port, and then sufficiently circulated in the longitudinal axis direction of the engine body toward the cooling water outlet from the engine body. Can be cooled.

図１に内燃機関の平面図を示し、図２に図１のＩＩ−ＩＩ線に沿ってみた内燃機関の平面図を示す。図１および図２において１は機関本体、２はシリンダブロック、３はシリンダブロック２上に固締されたシリンダヘッド、４はシリンダブロック２内に形成されたシリンダボア、５はピストン、６は燃焼室、７は燃焼室６の頂面中央部に配置された点火栓、８はシリンダヘッド３に配置された吸気弁、９はシリンダヘッド３内に形成された吸気ポート、１０はシリンダヘッド３に配置された排気弁、１１はシリンダヘッド３内に形成された排気ポートを夫々示す。   FIG. 1 shows a plan view of the internal combustion engine, and FIG. 2 shows a plan view of the internal combustion engine taken along line II-II in FIG. 1 and 2, 1 is an engine body, 2 is a cylinder block, 3 is a cylinder head fixed on the cylinder block 2, 4 is a cylinder bore formed in the cylinder block 2, 5 is a piston, and 6 is a combustion chamber. , 7 is a spark plug disposed in the center of the top surface of the combustion chamber 6, 8 is an intake valve disposed in the cylinder head 3, 9 is an intake port formed in the cylinder head 3, and 10 is disposed in the cylinder head 3. The exhaust valve 11 is an exhaust port formed in the cylinder head 3.

図１からわかるように内燃機関は各シリンダボア４のシリンダ軸線を通る機関本体１の長手軸線Ｋ−Ｋに沿って直列に配置された複数の気筒、図１に示す例では４つの気筒＃１〜＃４を具備しており、これらの各気筒＃１〜＃４は夫々一対の吸気弁８と一対の排気弁１０とを有する。また図１に示す内燃機関では長手軸線Ｋ−Ｋに関し一対の吸気弁８が配置されている側のシリンダヘッド３の一方の側壁面１２上において各吸気ポート９が開口せしめられており、長手軸線Ｋ−Ｋに関し一対の排気弁１０が配置されている側のシリンダヘッド３の他方の側壁面１３上において排気ポート１１が開口せしめられている。   As can be seen from FIG. 1, the internal combustion engine has a plurality of cylinders arranged in series along the longitudinal axis KK of the engine body 1 passing through the cylinder axis of each cylinder bore 4, and in the example shown in FIG. The cylinders # 1 to # 4 each have a pair of intake valves 8 and a pair of exhaust valves 10. Further, in the internal combustion engine shown in FIG. 1, each intake port 9 is opened on one side wall surface 12 of the cylinder head 3 on the side where the pair of intake valves 8 are arranged with respect to the longitudinal axis KK. An exhaust port 11 is opened on the other side wall surface 13 of the cylinder head 3 on the side where the pair of exhaust valves 10 is disposed with respect to KK.

なお、図１に示す内燃機関では各気筒＃１〜＃４の排気ポート１１はシリンダヘッド３内において共通の排気集合部１４に集合せしめられており、この排気集合部１４が他方の側壁面１３上において開口せしめられている。即ち、図１に示す内燃機関ではシリンダヘッド３はシリンダヘッド３内に各気筒＃１〜＃４の吸気ポート１０および排気集合部１４を形成した、いわゆる排気マニホルド一体型シリンダヘッドからなる。   In the internal combustion engine shown in FIG. 1, the exhaust ports 11 of the cylinders # 1 to # 4 are gathered in a common exhaust collecting portion 14 in the cylinder head 3, and this exhaust collecting portion 14 is the other side wall surface 13. Opened at the top. That is, in the internal combustion engine shown in FIG. 1, the cylinder head 3 is a so-called exhaust manifold integrated cylinder head in which the intake ports 10 and the exhaust collecting portions 14 of the cylinders # 1 to # 4 are formed in the cylinder head 3.

図２に示されるようにシリンダブロック２内には機関冷却水流通用のウォータジャケットＷＪ１が形成されており、シリンダヘッド３内にも機関冷却水流通用のウォータジャケットＷＪ２が形成されている。図３から図６はこれらウォータジャケットＷＪ１，ＷＪ２を形成するための中子の形状、即ちウォータジャケットＷＪ１，ＷＪ２の形状を示している。   As shown in FIG. 2, a water jacket WJ1 for circulating engine cooling water is formed in the cylinder block 2, and a water jacket WJ2 for circulating engine cooling water is also formed in the cylinder head 3. 3 to 6 show the shape of the core for forming the water jackets WJ1 and WJ2, that is, the shapes of the water jackets WJ1 and WJ2.

図３は図２において左側からみたときのウォータジャケットＷＪ１，ＷＪ２の形状を示しており、また図３においてハッチング部分はウォータジャケット部分を示している。図４は図３のＩＶ−ＩＶ線に沿ってみたシリンダブロック内のウォータジャケットＷＪ１の断面形状を示しており、図５は図３において上方からみたときのシリンダヘッド３内のウォータジャケットＷＪ２の形状を示している。図６（Ａ）および図６（Ｂ）は夫々図５においてＡ−Ａ断面およびＢ−Ｂ断面に沿ってみたウォータジャケットＷＪ１，ＷＪ２の断面形状を示しており、また図６（Ａ），（Ｂ）においてハッチング部分は断面となって表れるウォータジャケット部分を示している。   FIG. 3 shows the shape of the water jackets WJ1 and WJ2 when viewed from the left side in FIG. 2, and the hatched portion in FIG. 3 shows the water jacket portion. 4 shows a cross-sectional shape of the water jacket WJ1 in the cylinder block taken along line IV-IV in FIG. 3, and FIG. 5 shows a shape of the water jacket WJ2 in the cylinder head 3 as seen from above in FIG. Is shown. 6 (A) and 6 (B) show the cross-sectional shapes of the water jackets WJ1 and WJ2 as seen along the AA cross section and the BB cross section in FIG. 5, respectively, and FIGS. In B), the hatched portion indicates a water jacket portion that appears as a cross section.

なお、実際のウォータジャケットの形状は図３から図６に示されるウォータジャケットＷＪ１，ＷＪ２の形状よりも複雑な形状を有しているがウォータジャケット内における主な冷却水の流れを理解しやすくなるために図３から図６はウォータジャケットＷＪ１，ＷＪ２の形状を簡略化して示してある。   Although the actual water jacket has a more complicated shape than the water jackets WJ1 and WJ2 shown in FIGS. 3 to 6, it is easy to understand the main cooling water flow in the water jacket. Therefore, FIGS. 3 to 6 show the shapes of the water jackets WJ1 and WJ2 in a simplified manner.

さて、シリンダブロック２内に形成されたウォータジャケットＷＪ１は機関本体１の長手軸線Ｋ−Ｋに関して互いに反対側に位置する吸気ポート側ウォータジャケット２０と排気ポート側ウォータジャケット２１とに分割されており、図４からわかるように各ウォータジャケット２０，２１は各気筒＃１〜＃４のシリンダボア４の外周に沿って円弧状に延びている。また、機関本体１への冷却水入口２２はこの排気ポート側ウォータジャケット２１の長手軸線Ｋ−Ｋ方向における一端部に形成されている。ラジエータ（図示せず）により冷却された冷却水は図３、図４、図６（Ａ）においてＸ1で示されるようにこの冷却水入口２２から機関本体１に供給された後、排気ポート側ウォータジャケット２１内を機関本体１の長手軸線Ｋ−Ｋ方向に流れる。 Now, the water jacket WJ1 formed in the cylinder block 2 is divided into an intake port side water jacket 20 and an exhaust port side water jacket 21 located on opposite sides with respect to the longitudinal axis KK of the engine body 1, As can be seen from FIG. 4, the water jackets 20 and 21 extend in an arc along the outer periphery of the cylinder bore 4 of each cylinder # 1 to # 4. A cooling water inlet 22 to the engine body 1 is formed at one end of the exhaust port side water jacket 21 in the longitudinal axis KK direction. Radiator (not shown) cooling water cooled by the 3, 4, after being supplied to the engine body 1 from the cooling water inlet 22 as indicated by X 1 in FIG. 6 (A), the exhaust port side It flows in the water jacket 21 in the direction of the longitudinal axis KK of the engine body 1.

一方、図２に示されるようにシリンダヘッド３は点火栓７の挿入孔１５を包囲する筒状壁１６を有しており、この筒状壁１６の外周面に当る部分が図５および図６（Ａ）において符号１７で示されている。また、図３、図５、図６（Ｂ）には吸気弁８、吸気ポート９、排気弁１０、排気ポート１１等を配置するためにウォータジャケットＷＪ２とすることができない領域、即ち吸気弁取付用領域２３、吸気ポート形成用領域２４、排気弁取付用領域２５、排気ポート形成用領域２６が示されている。   On the other hand, as shown in FIG. 2, the cylinder head 3 has a cylindrical wall 16 surrounding the insertion hole 15 of the spark plug 7, and the portion of the cylindrical wall 16 that contacts the outer peripheral surface is shown in FIGS. 5 and 6. This is indicated by reference numeral 17 in (A). 3, 5, and 6 (B), an area where the water jacket WJ <b> 2 cannot be used for arranging the intake valve 8, the intake port 9, the exhaust valve 10, the exhaust port 11, etc. A region 23, an intake port forming region 24, an exhaust valve mounting region 25, and an exhaust port forming region 26 are shown.

ところで前述したように内燃機関ではシリンダヘッド３内において排気弁１０の周りや点火栓７の周りの温度が特に高くなり、従ってこれら排気弁１０の周りや点火栓７の周りを強力に冷却する必要がある。そこで本発明では図３、図５、図６（Ａ）においてＸ2で示されるように、シリンダブロック２内からシリンダヘッド３内の排気弁１０の周りに流入した後、吸気弁８および吸気ポート９の周りを一方の側壁面１２に向け横方向、即ち機関本体１の長手軸線Ｋ−Ｋに直交する方向に流れ、次いで図６（Ｂ）においてＸ3で示されるようにシリンダブロック２内に流出する冷却水の主流路を機関本体１内に形成するようにしている。 As described above, in the internal combustion engine, the temperature around the exhaust valve 10 and around the spark plug 7 in the cylinder head 3 is particularly high. Therefore, it is necessary to cool around the exhaust valve 10 and around the spark plug 7. There is. In this invention 3, as shown in Figure 5, X 2 in FIG. 6 (A), the after flowing from the cylinder block 2 around the exhaust valve 10 of the cylinder head 3, an intake valve 8 and an intake port laterally directed around 9 to one side wall surface 12, i.e., the flow in the direction perpendicular to the longitudinal axis K-K of the engine body 1, and then the cylinder block 2 as shown by X 3 in FIG. 6 (B) A main flow path of the cooling water flowing out is formed in the engine body 1.

もう少し具体的に言うと本発明による実施例ではこの主流路に沿い流れる冷却水は、シリンダブロック２内の排気ポート側ウォータジャケット２１からシリンダヘッド３内の対をなす排気弁１０間を通って点火栓挿入孔１５を包囲する筒状壁１６の外周面１７に達した後に吸気弁８および吸気ポート９周りを一方の側壁面１２に向け横方向に流れる。このように冷却水を対をなす排気弁１０間を通って点火栓７周りの筒状壁１６の外周壁１７に向かわせることにより特に高温となる排気弁１０の周りおよび点火栓７の周りを十分に冷却することができる。   More specifically, in the embodiment according to the present invention, the cooling water flowing along the main flow path is ignited from the exhaust port side water jacket 21 in the cylinder block 2 through the pair of exhaust valves 10 in the cylinder head 3. After reaching the outer peripheral surface 17 of the cylindrical wall 16 surrounding the plug insertion hole 15, the air flows laterally around the intake valve 8 and the intake port 9 toward the one side wall surface 12. In this way, the cooling water is passed through the pair of exhaust valves 10 toward the outer peripheral wall 17 of the cylindrical wall 16 around the spark plug 7, so that the exhaust valve 10 and the spark plug 7 that are particularly high in temperature are surrounded. It can be cooled sufficiently.

なお、上述のように冷却水を対をなす排気弁１０間を通って点火栓７周りの筒状壁１６の外周壁１７に向かわせるために排気ポート側ウォータジャケット２１内から上方に延びた後に点火栓７方向に湾曲して筒状壁１６の外周壁１７に向かう冷却水流路部分２７が各気筒＃１〜＃４に対して夫々一つずつ設けられている。本発明による実施例では排気ポート側ウォータジャケット２１内からシリンダヘッド３内に供給される全ての、或いは大部分の冷却水はこの冷却水流路部分２７を通ってシリンダヘッド３内に流入する。   In addition, after extending upward from the exhaust port side water jacket 21 in order to pass the cooling water to the outer peripheral wall 17 of the cylindrical wall 16 around the spark plug 7 through the pair of exhaust valves 10 as described above. A cooling water flow path portion 27 that curves in the direction of the spark plug 7 and faces the outer peripheral wall 17 of the cylindrical wall 16 is provided for each of the cylinders # 1 to # 4. In the embodiment according to the present invention, all or most of the cooling water supplied from the exhaust port side water jacket 21 into the cylinder head 3 flows into the cylinder head 3 through the cooling water flow path portion 27.

本発明による実施例では主流路に沿い流れる冷却水はシリンダヘッド３内を通った後、吸気ポート側ウォータジャケット２０内に流出する。次いでこの冷却水は図４においてＸ3で示されるように吸気ポート側ウォータジャケット２０内を機関本体１の長手軸線Ｋ−Ｋに流れ、次いで図３においてＸ3で示されるように上昇してシリンダヘッド３の隅部に形成された機関本体１からの冷却水出口２８から流出する。 In the embodiment according to the present invention, the cooling water flowing along the main flow path passes through the cylinder head 3 and then flows out into the intake port side water jacket 20. Then flows to the cooling water is the longitudinal axis K-K of the engine body 1 to the intake port side water jacket 20 as shown by X 3 in FIG. 4, then rises and as shown by X 3 in FIG. 3 cylinder It flows out from the coolant outlet 28 from the engine body 1 formed at the corner of the head 3.

なお、図５からわかるようにこの冷却水出口２８は上面から見た機関本体１において機関本体１への冷却水入口２２と対角位置に当るシリンダヘッド１の隅部に配置されている。なお、冷却水出口２８を高い位置に配置しているのはウォータジャケットＪＷ１，ＪＷ２内に混入している空気をウォータジャケットＪＷ１，ＪＷ２から抜くためである。   As can be seen from FIG. 5, the cooling water outlet 28 is arranged at the corner of the cylinder head 1 that is opposite to the cooling water inlet 22 to the engine main body 1 in the engine main body 1 as viewed from above. The reason why the cooling water outlet 28 is arranged at a high position is to remove the air mixed in the water jackets JW1 and JW2 from the water jackets JW1 and JW2.

一方、本発明では排気ポート１１周りを冷却するために、シリンダブロック２内からシリンダヘッド３内の排気弁１０の周りに流入した冷却水の一部は主流路Ｘ2に沿い流れる冷却水とは反対方向に排気ポート１１の周りを他方の側壁面１３に向け横方向に流通させた後、他方の側壁面１３に沿って機関本体１の長手軸線Ｋ−Ｋ方向に冷却水出口２８に向け流通せしめられる。即ち、冷却水の一部は筒状壁１６の外周面１７上において主流路Ｘ2に沿い流れる冷却水から分かれて主流路Ｘ2に沿い流れる冷却水とは反対方向に流通せしめられる。 On the other hand, in the present invention, in order to cool around the exhaust port 11, a part of the cooling water flowing from the cylinder block 2 around the exhaust valve 10 in the cylinder head 3 is the cooling water flowing along the main flow path X 2. In the opposite direction, the exhaust port 11 is circulated in the lateral direction toward the other side wall surface 13, and then circulated along the other side wall surface 13 in the longitudinal axis KK direction of the engine body 1 toward the cooling water outlet 28. To be sedated That is, a part of the cooling water is separated from the cooling water flowing along the main flow path X 2 on the outer peripheral surface 17 of the cylindrical wall 16 and circulated in the opposite direction to the cooling water flowing along the main flow path X 2 .

なお、本発明による実施例では、各気筒＃１〜＃４の排気ポート１１および排気集合部１４の上方および下方に夫々扁平な上方ウォータジャケット２９と下方ウォータジャケット３０とが形成されており、冷却水の一部は一方ではＹ1で示されるように上方ウォータジャケット２９内を他方の側壁面１３に向け横方向に流れた後にＹ2で示される如く他方の側壁面１３に沿って機関本体１の長手軸線Ｋ−Ｋ方向に冷却水出口２８に向け流れ、他方ではＺ1で示されるように下方ウォータジャケット３０内を他方の側壁面１３に向け横方向に流れた後にＺ2で示される如く他方の側壁面１３に沿って機関本体１の長手軸線Ｋ−Ｋ方向に冷却水出口２８に向け流れる。 In the embodiment according to the present invention, a flat upper water jacket 29 and a lower water jacket 30 are formed above and below the exhaust ports 11 and the exhaust collecting portions 14 of the cylinders # 1 to # 4, respectively. engine body along the other side wall surface 13 as shown by Y 2 after flowing laterally toward the other side wall surface 13 of the upper water jacket 29 as part whereas the water represented by Y 1 1 As shown by Z 2 after flowing in the direction of the longitudinal axis KK toward the cooling water outlet 28 and, on the other hand, flowing laterally in the lower water jacket 30 toward the other side wall surface 13 as indicated by Z 1. It flows toward the cooling water outlet 28 in the longitudinal axis KK direction of the engine body 1 along the other side wall surface 13.

即ち、図５および図６（Ａ）においてＹ1で示されるようにシリンダヘッド３内に流入した冷却水の一部は筒状壁１６の外周面１７上において流れ方向を反転し、他方の側壁面１３に向けて横方向に流れる。また、図３、図５、図６（Ｂ）においてＺ1で示されるようにシリンダヘッド３内に流入した冷却水の一部は排気ポート形成用領域２６周りを流れつつ次第に下方に向かい、次いで他方の側壁面１３に向けて横方向に流れる。 That is, as indicated by Y 1 in FIGS. 5 and 6A, a part of the cooling water flowing into the cylinder head 3 reverses the flow direction on the outer peripheral surface 17 of the cylindrical wall 16, and the other side It flows in the lateral direction toward the wall surface 13. Further, as indicated by Z 1 in FIGS. 3, 5, and 6B, a part of the cooling water flowing into the cylinder head 3 gradually flows downward while flowing around the exhaust port formation region 26, and then It flows in the lateral direction toward the other side wall surface 13.

ところで上方ウォータジャケット２９は機関本体１の長手軸線Ｋ−Ｋ方向における冷却水出口２８側の端部において空気抜き通路３１を介して冷却水出口２８に連結されている。また、下方ウォータジャケット３０は機関本体１の長手軸線Ｋ−Ｋ方向における冷却水出口２８側の端部において空気抜き通路３１に連結されており、従ってこの下方ウォータジャケット３０も空気抜き通路３１を介して冷却水出口２８に連結されることになる。   Incidentally, the upper water jacket 29 is connected to the cooling water outlet 28 via the air vent passage 31 at the end of the engine body 1 on the cooling water outlet 28 side in the longitudinal axis KK direction. Further, the lower water jacket 30 is connected to the air vent passage 31 at the end on the cooling water outlet 28 side in the longitudinal axis KK direction of the engine body 1. Therefore, the lower water jacket 30 is also cooled via the air vent passage 31. It will be connected to the water outlet 28.

このように各ウォータジャケット２９，３０を空気抜き通路３１を介して冷却水出口２８に連結すると図３、図５においてＹ2，Ｚ2に示されるように各ウォータジャケット２９，３０内の冷却水は他方の側壁面１３に沿って冷却水出口２８に向けて停滞することなく流れ、斯くして図３、図５においてＹ1，Ｚ1で示されるように上部ウォータジャケット２９内および下部ウォータジャケット３０内を冷却水が停滞することなく排気弁１０の周りから他方の側壁面１３に向けて停滞することなく流れる。その結果、各排気ポート１１を良好に冷却できることになる。 When the water jackets 29 and 30 are connected to the cooling water outlet 28 via the air vent passage 31 in this way, the cooling water in the water jackets 29 and 30 is transferred as indicated by Y 2 and Z 2 in FIGS. It flows without stagnation along the other side wall surface 13 toward the cooling water outlet 28. Therefore, in the upper water jacket 29 and the lower water jacket 30 as shown by Y 1 and Z 1 in FIGS. The cooling water flows from the periphery of the exhaust valve 10 toward the other side wall surface 13 without stagnation without stagnation. As a result, each exhaust port 11 can be cooled satisfactorily.

特に図１に示されるような排気マニホルド一体型シリンダヘッド３を用いた場合には排気集合部１４の温度が特に高くなる。このような場合でも排気集合部１４は上方ウォータジャケット２９と下方ウォータジャケット３０により上方および下方の双方から冷却されるので排気集合部１４が過熱するのを阻止することができることになる。   In particular, when the exhaust manifold integrated cylinder head 3 as shown in FIG. 1 is used, the temperature of the exhaust collecting portion 14 becomes particularly high. Even in such a case, the exhaust collecting portion 14 is cooled from both above and below by the upper water jacket 29 and the lower water jacket 30, so that the exhaust collecting portion 14 can be prevented from overheating.

シリンダヘッドの平面断面図である。It is a plane sectional view of a cylinder head. 図１のＩＩ−ＩＩ線に沿ってみたシリンダブロックおよびシリンダヘッドの断面図である。It is sectional drawing of the cylinder block and cylinder head which looked along the II-II line | wire of FIG. 側方からみたウォータジャケットの形状を示す図である。It is a figure which shows the shape of the water jacket seen from the side. 図３のＩＶ−ＩＶ断面に沿ってみたウォータジャケットの断面形状を示す図である。It is a figure which shows the cross-sectional shape of the water jacket seen along the IV-IV cross section of FIG. 上方からみたウォータジャケットの形状を示す図である。It is a figure which shows the shape of the water jacket seen from upper direction. 図５のＡ−Ａ断面およびＢ−Ｂ断面に沿ってみたウォータジャケットの断面形状を示す図である。It is a figure which shows the cross-sectional shape of the water jacket seen along the AA cross section and BB cross section of FIG.

符号の説明Explanation of symbols

１ 機関本体
２ シリンダブロック
３ シリンダヘッド
７ 点火栓
８ 吸気弁
９ 吸気ポート
１０ 排気弁
１１ 排気ポート
１２ 一方の側壁面
１３ 他方の側壁面
１４ 排気集合部
１６ 筒状壁
２０ 吸気ポート側ウォータジャケット
２１ 排気ポート側ウォータジャケット
２２ 冷却水入口
２８ 冷却水出口
２９ 上方ウォータジャケット
３０ 下方ウォータジャケット DESCRIPTION OF SYMBOLS 1 Engine main body 2 Cylinder block 3 Cylinder head 7 Spark plug 8 Intake valve 9 Intake port 10 Exhaust valve 11 Exhaust port 12 One side wall surface 13 The other side wall surface 14 Exhaust collecting part 16 Cylindrical wall 20 Intake port side water jacket 21 Exhaust Port side water jacket 22 Cooling water inlet 28 Cooling water outlet 29 Upper water jacket 30 Lower water jacket

Claims (5)

機関本体の長手軸線に沿って直列に配置された複数の気筒を具備しており、該長手軸線に関し吸気弁が配置されている側のシリンダヘッドの一方の側壁面上において吸気ポートを開口させると共に、該長手軸線に関し排気弁が配置されている側のシリンダヘッドの他方の側壁面上において排気ポートを開口させるようにした内燃機関において、シリンダブロック内からシリンダヘッド内の排気弁周りに流入した後、吸気弁および吸気ポート周りを上記一方の側壁面に向け横方向に流れてシリンダブロック内に流出する冷却水の主流路を機関本体内に形成し、シリンダブロック内からシリンダヘッド内の排気弁周りに流入した冷却水の一部を上記主流路に沿い流れる冷却水とは反対方向に排気ポートの周りを上記他方の側壁面に向け横方向に流通させた後、該他方の側壁面に沿って上記長手軸線方向に機関本体からの冷却水出口に向け流通させるようにした内燃機関の冷却構造。   A plurality of cylinders arranged in series along the longitudinal axis of the engine body are provided, and an intake port is opened on one side wall surface of the cylinder head on the side where the intake valve is arranged with respect to the longitudinal axis. In the internal combustion engine in which the exhaust port is opened on the other side wall surface of the cylinder head on the side where the exhaust valve is disposed with respect to the longitudinal axis, after flowing from the cylinder block around the exhaust valve in the cylinder head The main flow path of the cooling water that flows laterally around the intake valve and the intake port toward the one side wall surface and flows into the cylinder block is formed in the engine body, and from the cylinder block to the periphery of the exhaust valve in the cylinder head. A part of the cooling water that has flowed into the pipe flows in the direction opposite to the cooling water flowing along the main flow path in the lateral direction around the exhaust port toward the other side wall surface. After, the said other internal combustion engine as along the side wall surface is circulated toward the cooling water outlet from the engine body in the longitudinal axial direction of the cooling structure. 点火栓の周りに一対の吸気弁と一対の排気弁が配置されており、上記主流路に沿い流れる冷却水はシリンダブロック内からシリンダヘッド内の一対の排気弁間を通って点火栓挿入孔を包囲する筒状壁の外周面に達した後に吸気弁および吸気ポート周りを上記一方側壁面に向け横方向に流れ、上記冷却水の一部は該筒状壁の外周面上において上記主流路に沿い流れる冷却水から分かれて該主流路に沿い流れる冷却水とは反対方向に流れる請求項１に記載の内燃機関の冷却構造。   A pair of intake valves and a pair of exhaust valves are disposed around the spark plug, and the cooling water flowing along the main flow path passes between the pair of exhaust valves in the cylinder head from the cylinder block to the spark plug insertion hole. After reaching the outer peripheral surface of the surrounding cylindrical wall, it flows laterally toward the one side wall surface around the intake valve and the intake port, and a part of the cooling water flows to the main flow path on the outer peripheral surface of the cylindrical wall. The cooling structure for an internal combustion engine according to claim 1, wherein the cooling water is separated from the cooling water flowing along the main flow path and flows in a direction opposite to the cooling water flowing along the main flow path. 各気筒の排気ポートがシリンダヘッド内において共通の排気集合部に集合せしめられると共に該排気集合部が上記他方の側壁面上において開口せしめられており、各気筒の排気ポートおよび排気集合部の上方および下方に夫々扁平な上方ウォータジャケットと下方ウォータジャケットとが形成されており、上記冷却水の一部は一方では上方ウォータジャケット内を上記他方の側壁面に向け横方向に流れた後に該他方の側壁面に沿って上記長手軸線方向に機関本体からの冷却水出口に向け流れ、他方では下方ウォータジャケット内を上記他方の側壁面に向け横方向に流れた後に該他方の側壁面に沿って上記長手軸線方向に機関本体からの冷却水出口に向け流れる請求項１に記載の内燃機関の冷却構造。   The exhaust ports of each cylinder are gathered in a common exhaust collecting portion in the cylinder head, and the exhaust collecting portion is opened on the other side wall surface, and above the exhaust port and the exhaust collecting portion of each cylinder and A flat upper water jacket and a lower water jacket are respectively formed on the lower side, and a part of the cooling water flows on the other side after flowing in the upper water jacket laterally toward the other side wall surface. Flow along the wall surface in the longitudinal axis direction toward the coolant outlet from the engine body, and on the other hand, flow in the lower water jacket laterally toward the other side wall surface, and then flow along the other side wall surface. The cooling structure for an internal combustion engine according to claim 1, wherein the cooling structure flows in an axial direction toward a cooling water outlet from the engine body. シリンダブロック内に形成されたウォータジャケットが上記長手軸線に関して互いに反対側に位置する吸気ポート側ウォータジャケットと排気ポート側ウォータジャケットとに分割されており、上記主流路に沿い流れる冷却水は排気ポート側ウォータジャケットからシリンダヘッド内を通って吸気ポート側ウォータジャケットに向かう請求項１に記載の内燃機関の冷却構造。   The water jacket formed in the cylinder block is divided into an intake port side water jacket and an exhaust port side water jacket located on opposite sides with respect to the longitudinal axis, and the cooling water flowing along the main flow path is separated from the exhaust port side The cooling structure for an internal combustion engine according to claim 1, wherein the cooling structure for the internal combustion engine is directed from the water jacket to the intake port side water jacket through the cylinder head. 機関本体への冷却水入口が上記排気ポート側ウォータジャケットの上記長手軸線方向における一端部に形成されており、上面から見た機関本体において該機関本体への冷却水入口と対角位置に当るシリンダヘッドの隅部に上記機関本体からの冷却水出口を配置した請求項１に記載の内燃機関の冷却構造。   A cooling water inlet to the engine body is formed at one end in the longitudinal axis direction of the exhaust port side water jacket, and a cylinder that is opposite to the cooling water inlet to the engine body in the engine body as viewed from above The cooling structure for an internal combustion engine according to claim 1, wherein a cooling water outlet from the engine body is arranged at a corner of the head.
JP2007165058A 2007-06-22 2007-06-22 Internal combustion engine cooling structure Pending JP2009002265A (en)

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