JP4989602B2 - Multi-cylinder engine - Google Patents
Multi-cylinder engine Download PDFInfo
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- JP4989602B2 JP4989602B2 JP2008252199A JP2008252199A JP4989602B2 JP 4989602 B2 JP4989602 B2 JP 4989602B2 JP 2008252199 A JP2008252199 A JP 2008252199A JP 2008252199 A JP2008252199 A JP 2008252199A JP 4989602 B2 JP4989602 B2 JP 4989602B2
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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
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Description
本発明は、多気筒エンジンに関し、詳しくは、ＥＧＲクーラの損傷を抑制することができる多気筒エンジンに関するものである。 The present invention relates to a multi-cylinder engine, and more particularly to a multi-cylinder engine that can suppress damage to an EGR cooler.
従来の多気筒エンジンとして、本発明と同様、クランク軸の架設方向を前後方向、前後方向の任意の一方側を前、その反対側を後、クランク軸の架設方向と直交するシリンダヘッドの幅方向を横方向として、シリンダヘッドの横側に吸気分配通路が設けられ、この吸気分配通路の上方に前から順にＥＧＲクーラとＥＧＲ弁ケースとＥＧＲガス導入通路と吸気分配通路の吸気導入管とが配置され、ＥＧＲクーラの後端のクーラガス出口にＥＧＲ弁ケースの弁ケースガス入口が接続され、ＥＧＲ弁ケースの弁ケースガス出口が逆止弁ケースを介してＥＧＲガス導入通路の導入通路ガス入口に連通され、逆止弁でＥＧＲガス導入通路からＥＧＲ弁ケースへの逆流が阻止され、ＥＧＲガス導入通路の導入通路ガス出口が吸気導入管の周壁前側で吸気導入管内に連通され、吸気導入管の軸長方向に導入される吸気に吸気導入管の周壁前側から流入するＥＧＲガスが混入され、このＥＧＲガスが混入された吸気が吸気分配通路で各気筒の吸気ポートに分配されるようにしたものがある(例えば、特許文献１参照)。 As a conventional multi-cylinder engine, as in the present invention, the crankshaft erection direction is the front-rear direction, any one side of the anteroposterior direction is front, the opposite side is rear, and the cylinder head width direction is perpendicular to the crankshaft erection direction In the horizontal direction, an intake distribution passage is provided on the side of the cylinder head, and an EGR cooler, an EGR valve case, an EGR gas introduction passage, and an intake introduction pipe of the intake distribution passage are arranged above the intake distribution passage in order from the front. The valve case gas inlet of the EGR valve case is connected to the cooler gas outlet at the rear end of the EGR cooler, and the valve case gas outlet of the EGR valve case communicates with the introduction passage gas inlet of the EGR gas introduction passage through the check valve case. The check valve prevents the backflow from the EGR gas introduction passage to the EGR valve case, and the introduction passage gas outlet of the EGR gas introduction passage is introduced to the front side of the peripheral wall of the intake introduction pipe. EGR gas flowing in from the front side of the peripheral wall of the intake air introduction pipe is mixed into the intake air that is communicated with the inside of the pipe and introduced in the axial direction of the intake air introduction pipe. Some are distributed to ports (see, for example, Patent Document 1).
しかし、従来の多気筒エンジンでは、ＥＧＲクーラが水平に架設されているため、問題がある。 However, the conventional multi-cylinder engine has a problem because the EGR cooler is installed horizontally.
上記従来技術では、次の問題がある。
《問題》 ＥＧＲクーラが損傷しやすい。
ＥＧＲクーラが水平に架設されているため、燃料中に含まれる硫黄分によって発生する硫酸水が、エンジン停止中にＥＧＲクーラ内に溜まり、ＥＧＲクーラの内部配管を腐食させるおそれがあり、ＥＧＲクーラが損傷しやすい。
The above prior art has the following problems.
<Problem> The EGR cooler is easily damaged.
Since the EGR cooler is installed horizontally, sulfuric acid generated by sulfur contained in the fuel may accumulate in the EGR cooler while the engine is stopped, and the internal piping of the EGR cooler may be corroded. Easy to damage.
本発明は、上記問題点を解決することができる多気筒エンジン、すなわち、ＥＧＲクーラの損傷を抑制することができる多気筒エンジンを提供することを課題とする。 An object of the present invention is to provide a multi-cylinder engine that can solve the above-described problems, that is, a multi-cylinder engine that can suppress damage to an EGR cooler.
請求項１に係る発明の発明特定事項は、次の通りである。
図１に例示するように、クランク軸の架設方向(１)を前後方向、前後方向の任意の一方側を前、その反対側を後、クランク軸の架設方向(１)と直交するシリンダヘッド(２)の幅方向を横方向として、
シリンダヘッド(２)の横側に吸気分配通路(３)が設けられ、この吸気分配通路(３)の上方に前から順にＥＧＲクーラ(４)とＥＧＲ弁ケース(５)とＥＧＲガス導入通路(６)と吸気分配通路(３)の吸気導入管(７)とが配置され、ＥＧＲクーラ(４)の後端のクーラガス出口(８)にＥＧＲ弁ケース(５)の弁ケースガス入口(９)が接続され、ＥＧＲ弁ケース(５)の弁ケースガス出口(１０)が逆止弁(１１)を介してＥＧＲガス導入通路(６)の導入通路ガス入口(１２)に連通され、逆止弁(１１)でＥＧＲガス導入通路(６)からＥＧＲ弁ケース(５)への逆流が阻止され、ＥＧＲガス導入通路(６)の導入通路ガス出口(１４)が吸気導入管(７)の周壁前側で吸気導入管(７)内に連通され、吸気導入管(７)の軸長方向に導入される吸気(１５)に吸気導入管(７)の周壁前側から流入するＥＧＲガス(１６)が混入され、このＥＧＲガス(１６)が混入された吸気(１５)が吸気分配通路(３)で各気筒の吸気ポートに分配されるようにした、多気筒エンジンにおいて、
吸気分配通路壁(１７)の上部から逆止弁収容ケース(１８)が立ち上げられ、この逆止弁収容ケース(１８)の上部にＥＧＲ弁ケース(５)が載せられ、ＥＧＲクーラ(４)がその前端のＥＧＲクーラガス入口(１９)に向けて下り傾斜され、
吸気分配通路壁(１７)の上壁に沿って後向きに直進するＥＧＲガス導入通路(６)が設けられ、このＥＧＲガス通路(６)の上方にある空間で、吸気導入管(７)の上端部に接続された吸気パイプ(３９)と逆止弁収容ケース(１８)との間にある空間に、ＥＧＲ弁(２６)の弁駆動アクチュエータ(２７)がＥＧＲ弁ケース(５)の後面から後向きに突設されている、ことを特徴とする多気筒エンジン。
Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1, a cylinder head (1) in the front-rear direction, the front side in the front-rear direction, the rear in the opposite direction, and the cylinder head (1) perpendicular to the crank-shaft direction (1) The width direction of 2) is the horizontal direction,
An intake distribution passage (3) is provided on the side of the cylinder head (2), and an EGR cooler (4), an EGR valve case (5), and an EGR gas introduction passage (from the front above the intake distribution passage (3) ( 6) and the intake pipe (7) of the intake distribution passage (3) are arranged, and the EGR valve case (5) has a valve case gas inlet (9) to the cooler gas outlet (8) at the rear end of the EGR cooler (4). Is connected, and the valve case gas outlet (10) of the EGR valve case (5) is communicated with the introduction passage gas inlet (12) of the EGR gas introduction passage (6) via the check valve (11). (11) prevents the backflow from the EGR gas introduction passage (6) to the EGR valve case (5), and the introduction passage gas outlet (14) of the EGR gas introduction passage (6) is located on the front side of the peripheral wall of the intake introduction pipe (7). E is communicated in the intake air introduction pipe (7) and flows into the intake air (15) introduced in the axial length direction of the intake air introduction pipe (7) from the front side of the peripheral wall of the intake air introduction pipe (7). R Gas (16) is mixed, and to the EGR intake gas (16) is mixed (15) is distributed to an intake port of each cylinder in the intake distributing passage (3), the multi-cylinder engine,
A check valve storage case (18) is raised from the upper part of the intake distribution passage wall (17), and an EGR valve case (5) is placed on the upper part of the check valve storage case (18), and an EGR cooler (4). Is inclined downward toward the front EGR cooler gas inlet (19) ,
There is provided an EGR gas introduction passage (6) that goes straight backward along the upper wall of the intake distribution passage wall (17), and the upper end of the intake introduction pipe (7) is a space above the EGR gas passage (6). The valve drive actuator (27) of the EGR valve (26) is directed rearward from the rear surface of the EGR valve case (5) in a space between the intake pipe (39) connected to the section and the check valve housing case (18). A multi-cylinder engine, characterized in that it is protruded from.
（請求項１に係る発明）
《効果》 ＥＧＲクーラの損傷を抑制することができる。
図１に例示するように、吸気分配通路壁(１７)の上部から逆止弁収容ケース(１８)が立ち上げられ、この逆止弁収容ケース(１８)の上部にＥＧＲ弁ケース(５)が載せられ、ＥＧＲクーラ(４)がその前端のＥＧＲクーラガス入口(１９)に向けて下り傾斜されているので、燃料中に含まれる硫黄分によって発生する硫酸水が、エンジン停止中にＥＧＲクーラ(４)内からＥＧＲクーラガス入口(１９)を経てＥＧＲクーラ(４)外に自重で排出され、硫酸水に起因するＥＧＲクーラ(４)の内部配管の腐食が防止され、ＥＧＲクーラ(４)の損傷を抑制することができる。
《効果》 出力性能や排出ガス性能を高めることができる。
出力性能や排出ガス性能を高めることができる。その理由は、次のように推定される。
図１に例示するように、吸気分配通路壁(１７)の上壁に沿って後向きに直進するＥＧＲガス導入通路(６)が設けられているので、逆止弁(１１)を通過したＥＧＲガス(１６)がＥＧＲガス導入通路(６)で後向き直進方向に方向付けられ、導入通路ガス出口(１４)から吸気導入管(７)内に流入する。このため、吸気導入管(７)の径方向に沿うＥＧＲガス(１６)の貫通力が強く、ＥＧＲガス(１６)は吸気導入管(７)内の径方向の広い範囲で吸気(１５)に混入され、ＥＧＲガス(１６)が吸気(１５)全体に均一に分散され、各気筒に供給される吸気(１５)中のＥＧＲガス(１６)の濃度が均等化され、出力性能や排出ガス性能を高めることができる。
《効果》 エンジンの全高を低く維持することができる。
図１に例示するように、ＥＧＲ弁(２６)の弁駆動アクチュエータ(２７)がＥＧＲ弁ケース(５)の後面から後向きに突設されているので、逆止弁収容ケース(１８)の上方にＥＧＲ弁ケース(５)が載せられているにも拘わらず、エンジンの全高を低く維持することができる。
(Invention according to Claim 1)
<< Effect >> Damage to the EGR cooler can be suppressed.
As illustrated in FIG. 1, a check valve housing case (18) is raised from the upper part of the intake distribution passage wall (17), and an EGR valve case (5) is placed on the upper part of the check valve housing case (18). Since the EGR cooler (4) is placed and inclined downward toward the EGR cooler gas inlet (19) at the front end, sulfuric acid generated by sulfur contained in the fuel is removed from the EGR cooler (4 ) EGR cooler gas inlet (19) is discharged from the inside of the EGR cooler (4) by its own weight, and corrosion of the internal piping of the EGR cooler (4) due to sulfuric acid water is prevented and damage to the EGR cooler (4) is prevented. Can be suppressed.
<Effect> Output performance and exhaust gas performance can be improved.
Output performance and exhaust gas performance can be improved. The reason is estimated as follows.
As illustrated in FIG. 1, since the EGR gas introduction passage (6) that goes straight back along the upper wall of the intake distribution passage wall (17) is provided, the EGR gas that has passed through the check valve (11) is provided. (16) is directed rearwardly in the EGR gas introduction passage (6) and flows into the intake introduction pipe (7) from the introduction passage gas outlet (14). For this reason, the penetration force of the EGR gas (16) along the radial direction of the intake intake pipe (7) is strong, and the EGR gas (16) reaches the intake (15) in a wide radial range in the intake intake pipe (7). The mixed EGR gas (16) is uniformly dispersed throughout the intake air (15), the concentration of the EGR gas (16) in the intake air (15) supplied to each cylinder is equalized, and the output performance and exhaust gas performance Can be increased.
<Effect> The overall height of the engine can be kept low.
As illustrated in FIG. 1, since the valve drive actuator (27) of the EGR valve (26) protrudes rearward from the rear surface of the EGR valve case (5), it is located above the check valve housing case (18). Although the EGR valve case (5) is mounted, the overall height of the engine can be kept low.
（請求項２に係る発明）
請求項１に係る発明の効果に加え、次の効果を奏する。
《効果》 ＥＧＲクーラの冷却効率を高く維持することができる。
図１に例示するように、ＥＧＲクーラ(４)のクーラジャケット(２０)の冷却水出口(２１)がクーラジャケット(２０)の後端上部に配置されているので、ＥＧＲクーラ(４)のクーラジャケット(２０)内で発生した水蒸気が速やかに冷却水出口(２１)から流出し、ＥＧＲクーラ(４)の冷却効率を高く維持することができる。
(Invention according to Claim 2)
In addition to the effect of the invention according to claim 1, the following effect is achieved.
<Effect> The cooling efficiency of the EGR cooler can be maintained high.
As illustrated in FIG. 1, the cooling water outlet (21) of the cooler jacket (20) of the EGR cooler (4) is disposed at the upper rear end of the cooler jacket (20), so the cooler of the EGR cooler (4). Water vapor generated in the jacket (20) quickly flows out from the cooling water outlet (21), and the cooling efficiency of the EGR cooler (4) can be maintained high.
（請求項３に係る発明）
請求項１または請求項２に係る発明の効果に加え、次の効果を奏する。
《効果》 ＥＧＲクーラと弁冷却水通路の冷却水配管構造が簡素化される。
図１に例示するように、ＥＧＲ弁ケース(５)に弁冷却水通路(２２)が設けられ、弁冷却水通路(２２)の通路入口(２３)が冷却水パイプ(２４)を介してＥＧＲクーラ(４)のクーラジャケット(２０)のジャケット冷却水出口(２１)と連通され、クーラジャケット(２０)から流出した冷却水(２５)が冷却水パイプ(２４)を介して弁冷却水通路(２２)に流入するようにしたので、クーラジャケット(２０)と弁冷却水通路(２２)とが冷却水パイプ(２４)を介して直列接続され、ＥＧＲクーラ(４)と弁冷却水通路(２２)の冷却水配管構造冷却水の配管構造が簡素化される。
(Invention according to claim 3)
In addition to the effect of the invention according to claim 1 or
<Effect> The cooling water piping structure of the EGR cooler and the valve cooling water passage is simplified.
As illustrated in FIG. 1, the EGR valve case (5) is provided with a valve cooling water passage (22), and the passage inlet (23) of the valve cooling water passage (22) is connected to the EGR via the cooling water pipe (24). The cooling water (25) flowing out from the cooler jacket (20) is communicated with the jacket cooling water outlet (21) of the cooler jacket (20) of the cooler (4), and the valve cooling water passage ( 22), the cooler jacket (20) and the valve cooling water passage (22) are connected in series via the cooling water pipe (24), and the EGR cooler (4) and the valve cooling water passage (22 ) Cooling water piping structure The cooling water piping structure is simplified.
（請求項４に係る発明）
請求項１から請求項３のいずれかに係る発明の効果に加え、次の効果を奏する。
《効果》 エンジンの部品点数の削減を図ることができる。
図１に例示するように、吸気分配通路壁(１７)と吸気導入管(７)と逆止弁収容ケース(１８)とが、相互に連続する一体成型品とされているので、エンジンの部品点数の削減を図ることができる。
(Invention of Claim 4 )
In addition to the effects of the invention according to any one of claims 1 to 3 , the following effects are provided.
<Effect> It is possible to reduce the number of parts of the engine.
As illustrated in FIG. 1, the intake distribution passage wall (17), the intake introduction pipe (7), and the check valve housing case (18) are formed as an integrally molded product that is mutually continuous. The number of points can be reduced.
本発明の実施の形態を図面に基づいて説明する。図１は本発明の実施形態に係る多気筒エンジンの要部を説明する図で、この実施形態では、水冷立形のコモンレール式多気筒ディーゼルエンジンについて説明する。 Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view for explaining a main part of a multi-cylinder engine according to an embodiment of the present invention. In this embodiment, a water-cooled common rail multi-cylinder diesel engine will be described.
本発明の実施形態の概要は、次の通りである。
図１に示すように、クランク軸の架設方向(１)を前後方向、前後方向の任意の一方側を前、その反対側を後、クランク軸の架設方向(１)と直交するシリンダヘッド(２)の幅方向を横方向とする。
The outline of the embodiment of the present invention is as follows.
As shown in FIG. 1, the crankshaft erection direction (1) is the front-rear direction, the cylinder head (2) orthogonal to the erection direction (1) of the crankshaft, with one side of the front-rear direction in front and the other side in the rear ) Is the horizontal direction.
シリンダブロック(２８)の上部にシリンダヘッド(２)が組み付けられている。
シリンダヘッド(２)の横側に吸気分配通路(３)が設けられ、この吸気分配通路(３)の上方に前から順にＥＧＲクーラ(４)とＥＧＲ弁ケース(５)とＥＧＲガス導入通路(６)と吸気分配通路(３)の吸気導入管(７)とが配置されている。
吸気分配通路(３)は、吸気を各気筒に分配するための通路で、吸気分配通路壁(１７)は吸気マニホルドの機能を果たすものであるが、吸気分配通路壁(１７)が枝管のない箱形構造であるため、吸気分配通路、吸気分配通路壁と称している。
ＥＧＲクーラ(４)内には、クーラジャケット(２０)が設けられ、このクーラジャケット(２０)内に複数本のＥＧＲガス放熱管(２９)が前後方向に向けて架設されている。
The cylinder head (2) is assembled to the upper part of the cylinder block (28).
An intake distribution passage (3) is provided on the side of the cylinder head (2), and an EGR cooler (4), an EGR valve case (5), and an EGR gas introduction passage (from the front above the intake distribution passage (3) ( 6) and an intake pipe (7) of the intake distribution passage (3) are arranged.
The intake distribution passage (3) is a passage for distributing intake air to each cylinder, and the intake distribution passage wall (17) functions as an intake manifold, but the intake distribution passage wall (17) is a branch pipe. Since it has no box-shaped structure, it is called an intake distribution passage and an intake distribution passage wall.
A cooler jacket (20) is provided in the EGR cooler (4), and a plurality of EGR gas radiation pipes (29) are installed in the cooler jacket (20) in the front-rear direction.
ＥＧＲクーラ(４)の後端のクーラガス出口(８)にＥＧＲ弁ケース(５)の弁ケースガス入口(９)が接続され、ＥＧＲ弁ケース(５)の弁ケースガス出口(１０)が逆止弁(１１)を介してＥＧＲガス導入通路(６)の導入通路ガス入口(１２)に連通され、逆止弁(１１)でＥＧＲガス導入通路(６)からＥＧＲ弁ケース(５)への逆流が阻止されるようになっている。 The valve case gas inlet (9) of the EGR valve case (5) is connected to the cooler gas outlet (8) at the rear end of the EGR cooler (4), and the valve case gas outlet (10) of the EGR valve case (5) is non-returned. A valve (11) communicates with the introduction passage gas inlet (12) of the EGR gas introduction passage (6), and the check valve (11) reversely flows from the EGR gas introduction passage (6) to the EGR valve case (5). Is to be blocked.
ＥＧＲガス導入通路(６)の導入通路ガス出口(１４)が吸気導入管(７)の周壁前側で吸気導入管(７)内に連通され、吸気導入管(７)の軸長方向に導入される吸気(１５)に吸気導入管(７)の周壁前側から流入するＥＧＲガス(１６)が混入され、このＥＧＲガス(１６)が混入された吸気(１５)が吸気分配通路(３)で各気筒の吸気ポート(図外)に分配されるようにしている。 The introduction passage gas outlet (14) of the EGR gas introduction passage (6) communicates with the intake introduction pipe (7) on the front side of the peripheral wall of the intake introduction pipe (7) and is introduced in the axial direction of the intake introduction pipe (7). EGR gas (16) flowing in from the front side of the peripheral wall of the intake pipe (7) is mixed in the intake air (15), and the intake air (15) mixed with this EGR gas (16) is supplied to each intake distribution passage (3). It is distributed to the intake port (not shown) of the cylinder.
吸気分配通路壁(１７)の上部から逆止弁収容ケース(１８)が立ち上げられ、この逆止弁収容ケース(１８)の上部にＥＧＲ弁ケース(５)が載せられ、ＥＧＲクーラ(４)がその前端のＥＧＲクーラガス入口(１９)に向けて下り傾斜している。
吸気分配通路(３)の長手方向である前後方向を水平方向にし、この水平方向に対して俯角５°でＥＧＲクーラ(４)とその内部のＥＧＲガス放熱管(２９)が前向きに下り傾斜している。ＥＧＲクーラガス入口(１９)は接続管(４３)とシリンダヘッド(２)内を横断するヘッド内ＥＧＲ通路(４４)を介して排気側と連通している。接続管(４３)は鋳物製で、吸気分配通路壁(１７)の前方で、シリンダヘッド(２)の横側面に取り付けられている。
A check valve storage case (18) is raised from the upper part of the intake distribution passage wall (17), and an EGR valve case (5) is placed on the upper part of the check valve storage case (18), and an EGR cooler (4). Is inclined downward toward the front EGR cooler gas inlet (19).
The longitudinal direction of the intake air distribution passage (3) is set to the horizontal direction, and the EGR cooler (4) and the EGR gas heat radiating pipe (29) inside thereof are inclined downward and inclined forward at a depression angle of 5 ° with respect to the horizontal direction. ing. The EGR cooler gas inlet (19) communicates with the exhaust side via an in-head EGR passage (44) traversing the connecting pipe (43) and the cylinder head (2). The connection pipe (43) is made of a casting and is attached to the side surface of the cylinder head (2) in front of the intake distribution passage wall (17).
ＥＧＲクーラ(４)のクーラジャケット(２０)の冷却水出口(２１)がクーラジャケット(２０)の後端上部に配置されている。
ＥＧＲ弁ケース(５)に弁冷却水通路(２２)が設けられ、弁冷却水通路(２２)の通路入口(２３)が冷却水パイプ(２４)を介してクーラジャケット(２０)の冷却水出口(２１)と連通され、クーラジャケット(２０)から流出した冷却水(２５)が冷却水パイプ(２４)を介して弁冷却水通路(２２)に流入するようにしてある。
ＥＧＲクーラ(４)のクーラジャケット(２０)の冷却水入口(３０)がクーラジャケット(２０)の前端下部に配置され、この冷却水入口(３０)に冷却水入口パイプ(３１)を介してシリンダジャケット(図外)の冷却水出口(３２)が連通され、弁冷却水通路(２２)の通路出口(３３)に冷却水出口パイプ(３４)を介してシリンダブロック(２８)内の冷却水吸い込み通路(３５)の通路入口(３６)が連通され、冷却水吸い込み通路(３６)の通路出口(３７)が冷却水ポンプ(３８)に連通されている。このため、冷却水ポンプ(３８)の吸い込み力により、シリンダジャケット内の冷却水(２５)が冷却水入口パイプ(３１)、ＥＧＲクーラ(４)のクーラジャケット(２０)、冷却水パイプ(２４)、弁冷却水通路(２２)、冷却水出口パイプ(３４)、冷却水吸い込み通路(３５)を順に通過し、冷却水ポンプ(３８)を経てシリンダジャケットに戻る。
The cooling water outlet (21) of the cooler jacket (20) of the EGR cooler (4) is disposed at the upper rear end of the cooler jacket (20).
The EGR valve case (5) is provided with a valve cooling water passage (22), and the passage inlet (23) of the valve cooling water passage (22) is connected to the cooling water outlet of the cooler jacket (20) via the cooling water pipe (24). The coolant (25) communicated with (21) and flows out of the cooler jacket (20) flows into the valve coolant passage (22) through the coolant pipe (24).
The cooling water inlet (30) of the cooler jacket (20) of the EGR cooler (4) is disposed at the lower part of the front end of the cooling jacket (20), and the cooling water inlet (30) is connected to the cylinder via the cooling water inlet pipe (31). The cooling water outlet (32) of the jacket (not shown) is connected, and the cooling water suction in the cylinder block (28) is sucked into the passage outlet (33) of the valve cooling water passage (22) via the cooling water outlet pipe (34). The passage inlet (36) of the passage (35) is communicated, and the passage outlet (37) of the cooling water suction passage (36) is communicated to the cooling water pump (38). Therefore, due to the suction force of the cooling water pump (38), the cooling water (25) in the cylinder jacket becomes the cooling water inlet pipe (31), the cooler jacket (20) of the EGR cooler (4), and the cooling water pipe (24). The valve cooling water passage (22), the cooling water outlet pipe (34), and the cooling water suction passage (35) are passed through in this order, and then return to the cylinder jacket via the cooling water pump (38).
ＥＧＲ弁(２６)の弁駆動アクチュエータ(２７)がＥＧＲ弁ケース(５)の後面から後向きに突設されている。
吸気分配通路壁(１７)の上壁に沿って後向きに直進するＥＧＲガス導入通路(６)が設けられ、このＥＧＲガス通路(６)の上方にある空間で、吸気導入管(７)の上端部に接続された吸気パイプ(３９)と逆止弁収容ケース(１８)との間にある空間に、ＥＧＲ弁(２６)の弁駆動アクチュエータ(２７)がＥＧＲ弁ケース(５)の後面から後向きに突設されている。
吸気分配通路壁(１７)と吸気導入管(７)と逆止弁収容ケース(１８)とが、相互に連続する一体成型品とされている。
A valve drive actuator (27) of the EGR valve (26) protrudes rearward from the rear surface of the EGR valve case (5).
There is provided an EGR gas introduction passage (6) that goes straight backward along the upper wall of the intake distribution passage wall (17), and the upper end of the intake introduction pipe (7) is a space above the EGR gas passage (6). The valve drive actuator (27) of the EGR valve (26) is directed rearward from the rear surface of the EGR valve case (5) in a space between the intake pipe (39) connected to the section and the check valve housing case (18). Projected to
The intake distribution passage wall (17), the intake introduction pipe (7), and the check valve storage case (18) are integrally formed as a continuous product.
吸気導入管(７)には、過給機(図外)から吸気パイプ(３９)を介して過給がなされる。
吸気分配通路壁(１７)の真横にはコモンレール(４０)が配置されている。コモンレール(４０)には燃料サプライポンプ(４１)から燃料が圧送されて蓄圧され、高圧管(４２)を介して各気筒のインジェクタ(図外)に燃料が分配される。
The intake pipe (7) is supercharged from a supercharger (not shown) via an intake pipe (39).
A common rail (40) is disposed directly beside the intake distribution passage wall (17). Fuel is pumped and accumulated in the common rail (40) from the fuel supply pump (41), and the fuel is distributed to the injectors (not shown) of each cylinder via the high-pressure pipe (42).
(１) クランク軸の架設方向
(２) シリンダヘッド
(３) 吸気分配通路
(４) ＥＧＲクーラ
(５) ＥＧＲ弁ケース
(６) ＥＧＲガス導入通路
(７) 吸気導入管
(８) クーラガス出口
(９) 弁ケースガス入口
(１０) 弁ケースガス出口
(１１) 逆止弁
(１２) 導入通路ガス入口
(１４) 導入通路ガス出口
(１５) 吸気
(１６) ＥＧＲガス
(１７) 吸気分配通路壁
(１８) 逆止弁収容ケース
(１９) ＥＧＲクーラガス入口
(２０) クーラジャケット
(２１) 冷却水出口
(２２) 弁冷却水通路
(２３) 通路入口
(２４) 冷却水パイプ
(２５) 冷却水
(２６) ＥＧＲ弁
(２７) 弁駆動アクチュエータ
(1) Crankshaft installation direction
(2) Cylinder head
(3) Intake distribution passage
(4) EGR cooler
(5) EGR valve case
(6) EGR gas introduction passage
(7) Intake inlet pipe
(8) Cooler gas outlet
(9) Valve case gas inlet
(10) Valve case gas outlet
(11) Check valve
(12) Inlet passage gas inlet
(14) Introduction passage gas outlet
(15) Inhalation
(16) EGR gas
(17) Intake distribution passage wall
(18) Check valve storage case
(19) EGR cooler gas inlet
(20) Cooler jacket
(21) Cooling water outlet
(22) Valve cooling water passage
(23) Passage entrance
(24) Cooling water pipe
(25) Cooling water
(26) EGR valve
(27) Valve drive actuator
Claims (4)
シリンダヘッド(２)の横側に吸気分配通路(３)が設けられ、この吸気分配通路(３)の上方に前から順にＥＧＲクーラ(４)とＥＧＲ弁ケース(５)とＥＧＲガス導入通路(６)と吸気分配通路(３)の吸気導入管(７)とが配置され、ＥＧＲクーラ(４)の後端のクーラガス出口(８)にＥＧＲ弁ケース(５)の弁ケースガス入口(９)が接続され、ＥＧＲ弁ケース(５)の弁ケースガス出口(１０)が逆止弁(１１)を介してＥＧＲガス導入通路(６)の導入通路ガス入口(１２)に連通され、逆止弁(１１)でＥＧＲガス導入通路(６)からＥＧＲ弁ケース(５)への逆流が阻止され、ＥＧＲガス導入通路(６)の導入通路ガス出口(１４)が吸気導入管(７)の周壁前側で吸気導入管(７)内に連通され、吸気導入管(７)の軸長方向に導入される吸気(１５)に吸気導入管(７)の周壁前側から流入するＥＧＲガス(１６)が混入され、このＥＧＲガス(１６)が混入された吸気(１５)が吸気分配通路(３)で各気筒の吸気ポートに分配されるようにした、多気筒エンジンにおいて、
吸気分配通路壁(１７)の上部から逆止弁収容ケース(１８)が立ち上げられ、この逆止弁収容ケース(１８)の上部にＥＧＲ弁ケース(５)が載せられ、ＥＧＲクーラ(４)がその前端のＥＧＲクーラガス入口(１９)に向けて下り傾斜され、
吸気分配通路壁(１７)の上壁に沿って後向きに直進するＥＧＲガス導入通路(６)が設けられ、このＥＧＲガス通路(６)の上方にある空間で、吸気導入管(７)の上端部に接続された吸気パイプ(３９)と逆止弁収容ケース(１８)との間にある空間に、ＥＧＲ弁(２６)の弁駆動アクチュエータ(２７)がＥＧＲ弁ケース(５)の後面から後向きに突設されている、ことを特徴とする多気筒エンジン。 Crankshaft installation direction (1) is the front-rear direction, any one side of the front-rear direction is the front, the opposite side is the rear, the width direction of the cylinder head (2) perpendicular to the crankshaft installation direction (1) is the lateral direction As
An intake distribution passage (3) is provided on the side of the cylinder head (2), and an EGR cooler (4), an EGR valve case (5), and an EGR gas introduction passage (from the front above the intake distribution passage (3) ( 6) and the intake pipe (7) of the intake distribution passage (3) are arranged, and the EGR valve case (5) has a valve case gas inlet (9) to the cooler gas outlet (8) at the rear end of the EGR cooler (4). Is connected, and the valve case gas outlet (10) of the EGR valve case (5) is communicated with the introduction passage gas inlet (12) of the EGR gas introduction passage (6) via the check valve (11). (11) prevents the backflow from the EGR gas introduction passage (6) to the EGR valve case (5), and the introduction passage gas outlet (14) of the EGR gas introduction passage (6) is located on the front side of the peripheral wall of the intake introduction pipe (7). E is communicated in the intake air introduction pipe (7) and flows into the intake air (15) introduced in the axial length direction of the intake air introduction pipe (7) from the front side of the peripheral wall of the intake air introduction pipe (7). R Gas (16) is mixed, and to the EGR intake gas (16) is mixed (15) is distributed to an intake port of each cylinder in the intake distributing passage (3), the multi-cylinder engine,
A check valve storage case (18) is raised from the upper part of the intake distribution passage wall (17), and an EGR valve case (5) is placed on the upper part of the check valve storage case (18), and an EGR cooler (4). Is inclined downward toward the front EGR cooler gas inlet (19) ,
There is provided an EGR gas introduction passage (6) that goes straight backward along the upper wall of the intake distribution passage wall (17), and the upper end of the intake introduction pipe (7) is a space above the EGR gas passage (6). The valve drive actuator (27) of the EGR valve (26) is directed rearward from the rear surface of the EGR valve case (5) in a space between the intake pipe (39) connected to the valve portion and the check valve accommodating case (18). A multi-cylinder engine, characterized in that it is protruded from.
ＥＧＲクーラ(４)のクーラジャケット(２０)の冷却水出口(２１)がクーラジャケット(２０)の後端上部に配置されている、ことを特徴とする多気筒エンジン。 The multi-cylinder engine according to claim 1,
A multi-cylinder engine, characterized in that the cooling water outlet (21) of the cooler jacket (20) of the EGR cooler (4) is disposed at the upper rear end of the cooler jacket (20).
ＥＧＲ弁ケース(５)に弁冷却水通路(２２)が設けられ、弁冷却水通路(２２)の通路入口(２３)が冷却水パイプ(２４)を介してＥＧＲクーラ(４)のクーラジャケット(２０)の冷却水出口(２１)と連通され、クーラジャケット(２０)から流出した冷却水(２５)が冷却水パイプ(２４)を介して弁冷却水通路(２２)に流入するようにした、ことを特徴とする多気筒エンジン。 The multi-cylinder engine according to claim 1 or 2,
A valve cooling water passage (22) is provided in the EGR valve case (5), and a passage inlet (23) of the valve cooling water passage (22) is connected to a cooler jacket (4) of the EGR cooler (4) via a cooling water pipe (24). 20) is connected to the cooling water outlet (21), and the cooling water (25) flowing out from the cooler jacket (20) flows into the valve cooling water passage (22) via the cooling water pipe (24). This is a multi-cylinder engine.
吸気分配通路壁(１７)と吸気導入管(７)と逆止弁収容ケース(１８)とが、相互に連続する一体成型品とされている、ことを特徴する多気筒エンジン。 The multi-cylinder engine according to any one of claims 1 to 3 ,
A multi-cylinder engine characterized in that an intake distribution passage wall (17), an intake introduction pipe (7), and a check valve housing case (18) are integrally formed with each other.
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| JPS5996471A (en) * | 1982-11-22 | 1984-06-02 | Honda Motor Co Ltd | Suction system of multicylinder engine |
| JPH02211369A (en) * | 1989-02-08 | 1990-08-22 | Honda Motor Co Ltd | Exhaust recirculation flow passage structure of multicylinder type internal combustion engine |
| JPH05312112A (en) * | 1992-05-06 | 1993-11-22 | Toyota Autom Loom Works Ltd | Exhaust gas recirculation equipment of multiple cylinder engine |
| JP4054441B2 (en) * | 1998-06-22 | 2008-02-27 | 日産ディーゼル工業株式会社 | EGR device |
| JP2000073876A (en) * | 1998-08-25 | 2000-03-07 | Isuzu Motors Ltd | Intake manifold |
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