JP2005188351A - Cooling structure for exhaust manifold integrated type engine - Google Patents

Cooling structure for exhaust manifold integrated type engine Download PDF

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JP2005188351A
JP2005188351A JP2003429186A JP2003429186A JP2005188351A JP 2005188351 A JP2005188351 A JP 2005188351A JP 2003429186 A JP2003429186 A JP 2003429186A JP 2003429186 A JP2003429186 A JP 2003429186A JP 2005188351 A JP2005188351 A JP 2005188351A
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cooling water
cooling
exhaust
water jacket
exhaust manifold
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JP4098712B2 (en
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Hirotaka Yamamoto
浩貴 山本
Ayako Saito
綾子 齋藤
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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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
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • F01N3/043—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids without contact between liquid and exhaust gases
    • F01N3/046—Exhaust manifolds with cooling jacket
    • 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)
  • Exhaust Silencers (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To attain high cooling capability and size reduction in a cooling structure of an exhaust manifold integrated type engine. <P>SOLUTION: A water jacket 6 for cooling exhaust which cools an exhaust collection portion 2c and its surrounding is provided at a cylinder head 1 in which an exhaust manifold 2 is formed in an inner portion. A partition 10 is provided between a portion of which the width becomes narrower than the one at a portion in which the exhaust collection portion is formed in a central portion of the water jacket 6, an upstream end, and a downstream end respectively to form a flow passage as the water jacket so that cooling water may meander. When a distance to a cooling water inlet port 6a and a distance to a cooling water outlet port are the same, it means that the cooling area substantially increases, and the cooling efficiency can be increased without an increase in the capacity of the water jacket because a wide portion for storing the cooling water in the water jacket can be eliminated. Besides, the partition is formed by part of the cylinder head, therefore the cooling water passage can be meandered with a simple structure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、排気マニホールド一体型エンジンの冷却構造に関するものである。   The present invention relates to a cooling structure for an exhaust manifold integrated engine.

従来、自動車用エンジンのシリンダヘッドに排気マニホールドを形成したものがある（例えば、特許文献１参照。）。このような構造にしたエンジンにあっては、シリンダヘッド内に設けたウォータジャケットに流れる冷却水により、排気マニホールドを冷却することができる。また、排気マニホールドを囲む矩形箱状のマニホールドジャケットを排気マニホールドと一体成型で設けたものがある（例えば、特許文献２参照。）。
特公昭６１−１４５９８号公報（第２頁、第２図） 実願平３−６８７７６号公報（第５−６頁、図１） Conventionally, there is an automobile engine in which an exhaust manifold is formed on a cylinder head (see, for example, Patent Document 1). In the engine having such a structure, the exhaust manifold can be cooled by the cooling water flowing in the water jacket provided in the cylinder head. In addition, there is a rectangular box-shaped manifold jacket surrounding the exhaust manifold provided integrally with the exhaust manifold (see, for example, Patent Document 2).
Japanese Examined Patent Publication No. 61-14598 (2nd page, Fig. 2) Japanese Patent Application No. 3-68776 (page 5-6, FIG. 1)

上記したように排気マニホールドの回りに冷却水を流して排気マニホールド及びその集合部を冷却することにより、排気マニホールドを好適に冷却することができるが、高出力化により排気温度がより一層高くなる場合には、冷却能力をより一層高める必要がある。そのためには冷却する面積を大きくすることが考えられるが、ウォータジャケットが大型化してエンジンも大型化してしまうというという問題がある。   As described above, the exhaust manifold and its collecting part are cooled by flowing cooling water around the exhaust manifold, so that the exhaust manifold can be suitably cooled. However, when the exhaust temperature becomes higher due to higher output Therefore, it is necessary to further increase the cooling capacity. For this purpose, it is conceivable to increase the cooling area, but there is a problem that the water jacket becomes larger and the engine becomes larger.

このような課題を解決して、シリンダヘッドに一体に設けた排気マニホールドの冷却能力を高めると共に小型化し得る排気マニホールド一体型エンジンの冷却構造を実現するために本発明に於いては、シリンダヘッド（１）の内部に、複数の排気枝路（２ｂ）及び当該各排気枝路（２ｂ）を集合させた排気集合部（２ｃ）を有する排気マニホールド（２）と、少なくとも前記排気集合部（２ｃ）を冷却する排気冷却用ウォータジャケット（６）とが一体に形成された排気マニホールド一体型エンジンの冷却構造であって、前記排気冷却用ウォータジャケット（６）が、その内部を流れる冷却水が蛇行するように形成されているものとした。   In order to solve such a problem and realize a cooling structure for an exhaust manifold integrated engine that can increase the cooling capacity of an exhaust manifold integrally provided in the cylinder head and can be downsized, the cylinder head ( 1) an exhaust manifold (2) having a plurality of exhaust branches (2b) and an exhaust collecting part (2c) in which the exhaust branches (2b) are gathered, and at least the exhaust collecting part (2c) An exhaust manifold-integrated engine cooling structure integrally formed with an exhaust cooling water jacket (6) for cooling the exhaust cooling water jacket (6) meandering the cooling water flowing inside the exhaust cooling water jacket (6) It was assumed that it was formed as follows.

特に、前記排気冷却用ウォータジャケット（６）内に、その冷却水入口（６ａ）から冷却水出口（９）に至る直線的流路に対して横切る向きに延在するように前記シリンダヘッド（１）の一部により形成した仕切り（１０）が設けられていると良い。また、前記排気冷却用ウォータジャケット（６）における前記シリンダヘッド（１）の外面側の少なくとも一部が開口し、前記開口（７）が蓋部材（８）により閉塞されていると良い。   In particular, the cylinder head (1) extends in the water jacket (6) for exhaust cooling so as to extend in a direction transverse to the linear flow path from the cooling water inlet (6a) to the cooling water outlet (9). It is preferable that a partition (10) formed by a part of () is provided. Further, at least a part of the outer surface side of the cylinder head (1) in the exhaust cooling water jacket (6) is open, and the opening (7) is preferably closed by a lid member (8).

このように本発明によれば、シリンダヘッド内部に設けられた排気マニホールドにおいて高温の排気ガスが集まる排気集合部を冷却する排気冷却用ウォータジャケットをシリンダヘッド内部に設けると共に、そのウォータジャケットを冷却水の流れが蛇行するように形成したことから、冷却水入口と冷却水出口との距離が同じ場合には実質的に冷却面積が増大したことになり、さらにウォータジャケット内で冷却水の滞留するような広い部分を無くすことができるため、ウォータジャケットの容量を増大することなく冷却効率を高めることができる。また、冷却水の流路を蛇行させる仕切りをシリンダヘッドの一部により形成することにより、簡単な構造で冷却水流路を蛇行させることができる。   As described above, according to the present invention, an exhaust cooling water jacket for cooling an exhaust collecting portion where hot exhaust gas collects in the exhaust manifold provided in the cylinder head is provided in the cylinder head, and the water jacket is provided in the cooling water. Since the flow of water is formed in a meandering manner, the cooling area is substantially increased when the distance between the cooling water inlet and the cooling water outlet is the same, and the cooling water stays in the water jacket. Therefore, the cooling efficiency can be increased without increasing the capacity of the water jacket. Further, by forming a partition for meandering the cooling water flow path by a part of the cylinder head, the cooling water flow path can be meandered with a simple structure.

また、ウォータジャケットにおけるシリンダヘッドの外面側の一部が開口していることにより、その開口からウォータジャケット内にアクセス可能になることから、シリンダヘッド内の主ウォータジャケット（シリンダ室や燃焼室回りの冷却用）との連通路を設けて冷却水の入口及び出口とする加工を容易に行うことができる。また、空気抜き孔の加工も同様に容易に行うことができるなど、シリンダヘッドの燃焼室回りに設けられた主ウォータジャケットと排気冷却用ウォータジャケットとの間の配管などが不要になる。   In addition, since a part of the outer surface side of the cylinder head in the water jacket is open, it is possible to access the water jacket from the opening, so that the main water jacket (in the cylinder chamber and around the combustion chamber) in the cylinder head can be accessed. It is possible to easily perform processing to provide an inlet and an outlet of the cooling water by providing a communication passage with the cooling). In addition, since the air vent hole can be easily processed, piping between the main water jacket and the exhaust cooling water jacket provided around the combustion chamber of the cylinder head becomes unnecessary.

以下、本発明の実施の形態を、図面を参照しながら説明する。図１は本発明が適用された直列４気筒エンジンのシリンダヘッドにおける吸・排気路を示す図である。本エンジンにあっては、１気筒当たりそれぞれ２本の吸気弁及び排気弁が設けられた４バルブエンジンである。なお、直列４気筒や４バルブエンジンに限定されるものではなく、他の気筒数及びシリンダ配列やバルブ数は異なるものであっても良い。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing intake / exhaust paths in a cylinder head of an in-line four-cylinder engine to which the present invention is applied. This engine is a four-valve engine provided with two intake valves and two exhaust valves per cylinder. In addition, it is not limited to an in-line 4-cylinder or 4-valve engine, and the number of other cylinders, the cylinder arrangement, and the number of valves may be different.

図に示されるように、シリンダヘッド１の内部には排気マニホールド２が形成されている。この排気マニホールド２は、気筒の一対の排気バルブポートに連通する一対の排気分岐路２ａと、一対の排気分岐路２ａを１本にした排気枝路２ｂと、気筒と同数の各排気枝路２ｂを１つに集めた排気集合部２ｃとからなり、それらが図に示されるようにシリンダヘッド１内部に形成されている。なお、排気集合部２ｃが図２に併せて示されるようにシリンダヘッド１の側面に開口しており、その開口に外部排気管３が接続される。なお、排気マニホールド２は、図では平面化して描かれているが、実際には立体的に形成されている。   As shown in the figure, an exhaust manifold 2 is formed inside the cylinder head 1. The exhaust manifold 2 includes a pair of exhaust branch passages 2a communicating with a pair of exhaust valve ports of a cylinder, an exhaust branch passage 2b having a pair of exhaust branch passages 2a, and the same number of exhaust branch passages 2b as the number of cylinders. And an exhaust collecting portion 2c, which are formed into one, and are formed inside the cylinder head 1 as shown in the figure. As shown in FIG. 2, the exhaust collecting portion 2c is opened on the side surface of the cylinder head 1, and the external exhaust pipe 3 is connected to the opening. In addition, although the exhaust manifold 2 is drawn flat in the drawing, it is actually formed in three dimensions.

排気マニホールド２内を排気ガスが流れるため、排気マニホールド２を冷却する必要がある。その冷却は、シリンダヘッド１内に設けられているウォータジャケットの一部を排気マニホールド２の回りにも設けることにより行うことができる。   Since the exhaust gas flows through the exhaust manifold 2, it is necessary to cool the exhaust manifold 2. The cooling can be performed by providing a part of the water jacket provided in the cylinder head 1 also around the exhaust manifold 2.

本図示例のエンジンにおけるウォータジャケットは、図３に示されるような形状になっている。図３で示されている形状は、シリンダヘッド１及びシリンダブロック（図示せず）にそれぞれ形成された各ウォータジャケット４・５の外形を概略示すものである。シリンダブロック側のウォータジャケット５は、各気筒をそれぞれ外囲するように波状かつ全体として長円の環状をなしている。なお、ウォータジャケット５への冷却水入口５ａが気筒列の方向一端に設けられ、冷却水出口５ｂが対応する気筒を挟んで対向位置に設けられている。   The water jacket in the engine of the illustrated example has a shape as shown in FIG. The shape shown in FIG. 3 schematically shows the outer shape of each of the water jackets 4 and 5 formed in the cylinder head 1 and the cylinder block (not shown). The water jacket 5 on the cylinder block side has a wave shape and an oval annular shape as a whole so as to surround each cylinder. A cooling water inlet 5a to the water jacket 5 is provided at one end in the direction of the cylinder row, and a cooling water outlet 5b is provided at an opposing position across the corresponding cylinder.

また、ウォータジャケット５における冷却水入口５ａと冷却水出口５ｂとの間にはセパレータ（シリンダブロックの一部をウォータジャケット５内へ隔壁として突出させて形成）５ｃが設けられており、冷却水入口５ａと冷却水出口５ｂとの間の短い方に流れる冷却水の流量が少量になるように制限されている。これにより、冷却水入口５ａから流入した冷却水のほとんどが図の矢印Ａに示されるように全気筒を巡るように流れる。なお、冷却水の一部は図の矢印Ｂに示されるように、セパレータ５ｃにより遮断されていない部分から冷却水出口側へ流れ得る。   Further, a separator (formed by protruding a part of the cylinder block into the water jacket 5 as a partition wall) 5c is provided between the cooling water inlet 5a and the cooling water outlet 5b in the water jacket 5, and the cooling water inlet The flow rate of the cooling water flowing in the shorter direction between 5a and the cooling water outlet 5b is limited to be small. As a result, most of the cooling water flowing in from the cooling water inlet 5a flows around all the cylinders as indicated by an arrow A in the figure. A part of the cooling water can flow from the part not blocked by the separator 5c to the cooling water outlet side as indicated by an arrow B in the figure.

シリンダブロック側ウォータジャケット５とシリンダヘッド側ウォータジャケット４とは、シリンダブロック及びシリンダヘッド１との間に挟持されるガスケット（図示せず）に設けられた冷却水通路を介して連通している。冷却水通路１１ａ・１１ｂは、図４に示されるように冷却水入口５ａ及び冷却水出口５ｂが設けられている気筒列一端側に多く配設されている。また、気筒列一端側に設けられた冷却水通路１１ａの開口面積は他の冷却水通路１１ｂよりも広くされている。これら冷却水通路１１ａ・１１ｂを介して、シリンダブロック側ウォータジャケット５内の冷却水の一部がシリンダヘッド側ウォータジャケット４に流れるようになっている（矢印Ｃ）。ウォータジャケット４に流れ込んだ冷却水は、燃焼室回りを冷却し、気筒列方向において冷却水通路１１ａを設けられた側とは相反する側に設けられた複数の冷却水出口４ｂから流出される。   The cylinder block side water jacket 5 and the cylinder head side water jacket 4 communicate with each other via a coolant passage provided in a gasket (not shown) sandwiched between the cylinder block and the cylinder head 1. As shown in FIG. 4, many cooling water passages 11a and 11b are arranged on one end side of the cylinder row where the cooling water inlet 5a and the cooling water outlet 5b are provided. Further, the opening area of the cooling water passage 11a provided on one end side of the cylinder row is made wider than that of the other cooling water passages 11b. A part of the cooling water in the cylinder block side water jacket 5 flows to the cylinder head side water jacket 4 through these cooling water passages 11a and 11b (arrow C). The cooling water flowing into the water jacket 4 cools around the combustion chamber and flows out from a plurality of cooling water outlets 4b provided on the side opposite to the side provided with the cooling water passage 11a in the cylinder row direction.

本図示例にあっては、図１に示されるように排気集合部２ｃを中心とする排気マニホールド２を冷却するための排気マニホールド冷却用ウォータジャケット６が設けられている。この排気マニホールド冷却用ウォータジャケット６は、シリンダヘッド１に凹設された部分と、蓋部材７とにより画定されて形成されている。シリンダヘッド１を鋳造する場合に排気マニホールド冷却用ウォータジャケット６を併せて形成することができ、例えば排気マニホールド２の中子をセットするのと同時にウォータジャケット６の中子をセットし、または排気マニホールド２の中子をセットした後にウォータジャケット６の中子をセットすることができる。したがって、シリンダヘッド１の製造を排気マニホールド冷却用ウォータジャケット６の無い場合と略同等に行うことができるため、ウォータジャケット６をシリンダヘッド１に設けることによる生産性の低下が生じることがない。   In the illustrated example, as shown in FIG. 1, an exhaust manifold cooling water jacket 6 for cooling the exhaust manifold 2 around the exhaust collecting portion 2c is provided. The exhaust manifold cooling water jacket 6 is defined and formed by a portion recessed in the cylinder head 1 and a lid member 7. When casting the cylinder head 1, the water jacket 6 for cooling the exhaust manifold can be formed together. For example, the core of the water jacket 6 is set simultaneously with the core of the exhaust manifold 2, or the exhaust manifold After setting the two cores, the core of the water jacket 6 can be set. Therefore, since the cylinder head 1 can be manufactured in substantially the same manner as the case where the exhaust manifold cooling water jacket 6 is not provided, the productivity reduction due to the provision of the water jacket 6 in the cylinder head 1 does not occur.

なお、シリンダヘッド１の側壁面には、図２に示されるように排気マニホールド冷却用ウォータジャケット６の中子の挿抜孔として左右一対の開口７が設けられている。これらの開口７には蓋部材８が取り付けられる。また、ウォータジャケット６の長手方向一端側（図１の右側）にシリンダヘッド側ウォータジャケット４と連通する冷却水入口６ａが設けられ、他端側（図１の左側）には蓋部材８に取り付けたホースプラグ９により冷却水出口が設けられており、上記一端側から他端側に向けて冷却水が流れるようになっている。   A pair of left and right openings 7 are provided on the side wall surface of the cylinder head 1 as insertion / extraction holes for the core of the exhaust manifold cooling water jacket 6 as shown in FIG. A lid member 8 is attached to these openings 7. Further, a cooling water inlet 6a communicating with the cylinder head side water jacket 4 is provided on one end side in the longitudinal direction of the water jacket 6 (right side in FIG. 1), and attached to the lid member 8 on the other end side (left side in FIG. 1). The hose plug 9 is provided with a cooling water outlet so that the cooling water flows from the one end side toward the other end side.

そして、排気マニホールド冷却用ウォータジャケット６には、排気集合部２ｃと左右両開口７との各中間部には、シリンダヘッド１に一体に形成したリブ状の仕切り１０がそれぞれ設けられている。また、ウォータジャケット６の長手方向中央部分が排気集合部２ｃを外部に開通させるために細くなっている。そして、各仕切り１０は、ウォータジャケット６における冷却水入口６ａから冷却水出口（９）に至る直線的な流路を横切る向きに延在し、かつウォータジャケット６における排気集合部２ｃの形成部分により細くされている側とは相反する側を細くするようにウォータジャケット６の幅方向一端から他端側に向けて延出している。これにより、ウォータジャケット６の流路が蛇行するように形成されている。   The exhaust manifold cooling water jacket 6 is provided with rib-shaped partitions 10 formed integrally with the cylinder head 1 at intermediate portions between the exhaust collecting portion 2 c and the left and right openings 7. Further, the central portion in the longitudinal direction of the water jacket 6 is narrowed to open the exhaust collecting portion 2c to the outside. Each partition 10 extends in a direction crossing a linear flow path from the cooling water inlet 6 a to the cooling water outlet (9) in the water jacket 6, and is formed by a portion where the exhaust collecting portion 2 c is formed in the water jacket 6. The water jacket 6 extends from one end in the width direction toward the other end so as to make the side opposite to the side that is made thinner. Thereby, the flow path of the water jacket 6 is formed to meander.

したがって、排気マニホールド冷却用ウォータジャケット６の長手方向一端側から他端側に向けて流れる冷却水の流れは、図５の矢印に示されるように左右の仕切り１０と排気集合部２ｃの形成部分とにより蛇行する流れとなる。このように冷却水流路が蛇行していることにより、排気マニホールド冷却用ウォータジャケット６において、冷却水の流路長が長くなり、排気マニホールド２に対する接触面積が大きくなり、排気マニホールド２に対する冷却性が向上する。   Therefore, the flow of the cooling water flowing from one end side to the other end side in the longitudinal direction of the exhaust manifold cooling water jacket 6 is as shown by the arrows in FIG. 5 and the portions where the left and right partitions 10 and the exhaust collecting portion 2c are formed. The flow becomes meandering. Since the cooling water flow path meanders in this way, in the exhaust manifold cooling water jacket 6, the flow path length of the cooling water is increased, the contact area with the exhaust manifold 2 is increased, and the cooling performance with respect to the exhaust manifold 2 is improved. improves.

一方、仕切り１０を設けない場合には図６に示されるようになるウォータジャケット１６において、その冷却水の流れは、図の矢印に示されるように冷却水入口６ａから冷却水出口（９）に向けて直線的に流れ、一部が両端部の幅広部分を還流する。そのため、ウォータジャケット１６の幅広部分において一部（特に角部）に冷却水が滞留する部分が生じ、冷却性が悪化する。   On the other hand, when the partition 10 is not provided, in the water jacket 16 as shown in FIG. 6, the flow of the cooling water flows from the cooling water inlet 6a to the cooling water outlet (9) as shown by the arrows in the figure. It flows in a straight line and partly circulates through the wide portions at both ends. For this reason, in the wide portion of the water jacket 16, a portion in which the cooling water stays in a part (particularly the corner) is generated, and the cooling performance is deteriorated.

それに対して、本願発明に基づく上記仕切り１０を設けた構造によれば、ウォータジャケット６の幅広部分に対して蛇行して流れるようになるため、ウォータジャケット６内の流れを均一化することができる。そして、上記角部に冷却水が滞留してしまうことがないなど、排気集合部２ｃ回りの冷却性がより一層向上する。   On the other hand, according to the structure provided with the partition 10 according to the present invention, the flow in the water jacket 6 can be made uniform because the meandering flow flows with respect to the wide portion of the water jacket 6. . Further, the cooling performance around the exhaust collecting portion 2c is further improved such that the cooling water does not stay in the corner portion.

また、排気マニホールド冷却用ウォータジャケット６における冷却水入口６ａ及び冷却水出口（９）の各上側にはエア抜き孔６ｂが設けられている。なお、エア抜き孔６ｂは冷却水入口６ａ及び冷却水出口（９）よりも小径に形成されており、ウォータジャケット６における主な冷却水の流れが冷却水入口６ａ及び冷却水出口（９）間になるようにされている。これにより、シリンダヘッド側ウォータジャケット４内の流れも下側の冷却水入口６ａが主体となり、燃焼室の冷却に対して有利となる。   An air vent hole 6b is provided on each upper side of the cooling water inlet 6a and the cooling water outlet (9) in the water jacket 6 for exhaust manifold cooling. The air vent hole 6b has a smaller diameter than the cooling water inlet 6a and the cooling water outlet (9), and the main cooling water flow in the water jacket 6 is between the cooling water inlet 6a and the cooling water outlet (9). To be. Thereby, the flow in the cylinder head side water jacket 4 is also mainly composed of the lower cooling water inlet 6a, which is advantageous for cooling the combustion chamber.

なお、上記図示例では冷却水出口を蓋部材８に取り付けたホースプラグ９としたが、冷却水入口６ａと同様にシリンダヘッド側ウォータジャケット４と連通させるようにしても良い。それにより、余計な外部配管部材や配管作業を必要としなくなり、製造コストを低廉化し得る。また、冷却水入口６ａ及びエア抜き孔６ｂ、さらに上記シリンダヘッド側ウォータジャケット４と連通させる冷却水出口の加工にあっては、それらを各開口７に対応する位置に設けることができ、各孔に対する砂抜きを容易に行うことができると共に孔加工後に蓋部材８を取り付けるという簡単な作業で実施可能である。   Although the cooling water outlet is the hose plug 9 attached to the lid member 8 in the illustrated example, it may be communicated with the cylinder head side water jacket 4 in the same manner as the cooling water inlet 6a. This eliminates the need for extra external piping members and piping work, and can reduce the manufacturing cost. Further, in the processing of the cooling water inlet 6a and the air vent hole 6b, and the cooling water outlet communicating with the cylinder head side water jacket 4, they can be provided at positions corresponding to the respective openings 7. It is possible to easily remove the sand and to attach the lid member 8 after drilling.

また、図５に示されるように、外部排気管（排気部品）３をシリンダヘッド１に取り付けるボルト（図示せず）をねじ込むボルト孔を設けたボス１２と排気集合部２ｃとの間を冷却水が流れる連通路１３が設けられていることにより、ボルトの熱による軸力低下を好適に防ぐことができる。   Further, as shown in FIG. 5, cooling water is provided between the boss 12 provided with a bolt hole into which a bolt (not shown) for attaching the external exhaust pipe (exhaust part) 3 to the cylinder head 1 is screwed and the exhaust collecting portion 2c. By providing the communication passage 13 through which the shaft flows, it is possible to suitably prevent a reduction in the axial force due to the heat of the bolt.

なお、本発明は、クランク軸を鉛直方向とした船外機などのような船舶推進機用エンジンにも適用可能である。   Note that the present invention can also be applied to a marine vessel propulsion engine such as an outboard motor having a vertical crankshaft.

本発明にかかる排気マニホールド一体型エンジンの冷却構造は、排気集合部に対する冷却性が高く、シリンダヘッド内部に排気マニホールドの集合部を設けたエンジンの冷却構造等として有用である。   The cooling structure for an exhaust manifold integrated engine according to the present invention has high cooling performance for the exhaust collecting portion, and is useful as an engine cooling structure in which the collecting portion of the exhaust manifold is provided inside the cylinder head.

本発明が適用された直列４気筒エンジンのシリンダヘッドにおける吸・排気路を示す図である。It is a figure which shows the intake / exhaust path in the cylinder head of the in-line 4 cylinder engine to which this invention was applied. 図１の矢印II−II線に沿って見た端面図である。It is the end elevation seen along the arrow II-II line of FIG. シリンダヘッド及びシリンダブロックの各ウォータジャケットを概略示す斜視図である。It is a perspective view showing roughly each water jacket of a cylinder head and a cylinder block. シリンダブロック側ウォータジャケットを示す平面図である。It is a top view which shows a cylinder block side water jacket. 排気マニホールド冷却用ウォータジャケットの冷却水の流れを示す図である。It is a figure which shows the flow of the cooling water of the water jacket for exhaust manifold cooling. 仕切りを設けない場合の図４に対応する図である。It is a figure corresponding to FIG. 4 when not providing a partition.

符号の説明Explanation of symbols

１ シリンダヘッド
２ 排気マニホールド、２ｂ 排気枝路、２ｃ 排気集合部
６ 排気冷却用ウォータジャケット、６ａ 冷却水入口
７ 開口
８ 蓋部材
９ 冷却水出口
１０ 仕切り DESCRIPTION OF SYMBOLS 1 Cylinder head 2 Exhaust manifold, 2b Exhaust branch, 2c Exhaust collecting part 6 Exhaust cooling water jacket, 6a Cooling water inlet 7 Opening 8 Lid member 9 Cooling water outlet 10 Partition

Claims (3)

シリンダヘッドの内部に、複数の排気枝路及び当該各排気枝路を集合させた排気集合部を有する排気マニホールドと、少なくとも前記排気集合部を冷却する排気冷却用ウォータジャケットとが一体に形成された排気マニホールド一体型エンジンの冷却構造であって、
前記排気冷却用ウォータジャケットが、その内部を流れる冷却水が蛇行するように形成されていることを特徴とする排気マニホールド一体型エンジンの冷却構造。 Inside the cylinder head, an exhaust manifold having an exhaust manifold and an exhaust manifold that collects the exhaust branches, and an exhaust cooling water jacket that cools at least the exhaust manifold are integrally formed. An exhaust manifold integrated engine cooling structure,
The exhaust manifold-integrated engine cooling structure, wherein the exhaust cooling water jacket is formed so that the cooling water flowing through the water jacket meanders. 前記排気冷却用ウォータジャケット内に、その冷却水入口から冷却水出口に至る直線的流路に対して横切る向きに延在するように前記シリンダヘッドの一部により形成した仕切りが設けられていることを特徴とする請求項１に記載の排気マニホールド一体型エンジンの冷却構造。   A partition formed by a part of the cylinder head is provided in the water jacket for cooling the exhaust gas so as to extend in a direction transverse to the linear flow path from the cooling water inlet to the cooling water outlet. The cooling structure for an exhaust manifold-integrated engine according to claim 1. 前記排気冷却用ウォータジャケットにおける前記シリンダヘッドの外面側の少なくとも一部が開口し、前記開口が蓋部材により閉塞されていることを特徴とする請求項１または請求項２に記載の排気マニホールド一体型エンジンの冷却構造。   3. The exhaust manifold integrated type according to claim 1, wherein at least a part of the outer surface side of the cylinder head in the exhaust cooling water jacket is opened, and the opening is closed by a lid member. Engine cooling structure.
JP2003429186A 2003-12-25 2003-12-25 Exhaust manifold integrated engine cooling structure Expired - Fee Related JP4098712B2 (en)

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