JP4644574B2 - Multi-cylinder engine - Google Patents

Multi-cylinder engine Download PDF

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JP4644574B2
JP4644574B2 JP2005278206A JP2005278206A JP4644574B2 JP 4644574 B2 JP4644574 B2 JP 4644574B2 JP 2005278206 A JP2005278206 A JP 2005278206A JP 2005278206 A JP2005278206 A JP 2005278206A JP 4644574 B2 JP4644574 B2 JP 4644574B2
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valve case
egr valve
egr
intake
cylinder
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JP2007085302A (en
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哲 前小屋
隆敏 今井
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Kubota 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

Description

本発明は、多気筒エンジンに関し、詳しくは、ＮＯＸの低減機能を高め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 enhance the function of reducing NO X.

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一側面に吸気分配通路壁を取り付け、シリンダヘッドの横他側面に排気合流通路壁を取り付け、排気合流通路壁内をＥＧＲ弁ケースを介して吸気分配通路壁内に連通させたものがある。
この種の多気筒エンジンでは、ＥＧＲ弁によって適正なＥＧＲ率を維持し、ＮＯＸを低減することができる利点がある。 As a conventional multi-cylinder engine, as in the present invention, the crankshaft installation direction is the front-rear direction, the width direction of the cylinder head perpendicular to the front-rear direction is the lateral direction, and an intake distribution passage wall is attached to the lateral side surface of the cylinder head. There is a type in which an exhaust merging passage wall is attached to the other side surface of the cylinder head and the inside of the exhaust merging passage wall is communicated with the intake distribution passage wall through an EGR valve case.
In this type of multi-cylinder engine, to maintain the proper EGR ratio by the EGR valve, there is an advantage that it is possible to reduce the NO X.

しかし、上記従来のエンジンでは、吸気通路の中心部に向けてＥＧＲガスを導入するようになっているため、問題が生じている。   However, the conventional engine has a problem because EGR gas is introduced toward the center of the intake passage.

上記従来技術では、次の問題がある。
《問題》 ＮＯＸの低減機能が低い。
吸気通路の中心部に向けてＥＧＲガスを導入するようになっているため、ＥＧＲガスと吸気との混合が不十分で、各気筒へのＥＧＲガスの分配が不均一になる。このため、ＮＯＸの低減機能が低い。 The above prior art has the following problems.
"Problem" function of reducing NO X is low.
Since the EGR gas is introduced toward the center of the intake passage, the mixing of the EGR gas and the intake air is insufficient, and the distribution of the EGR gas to each cylinder becomes uneven. Therefore, reducing function of the NO X is low.

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、ＮＯＸの低減機能を高め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。 The present invention is a multi-cylinder engine capable of solving the above problems, i.e., an object to provide a multi-cylinder engine which can enhance the function of reducing NO X.

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(１)の架設方向を前後方向、前後方向と直交するシリンダヘッド(１０)の幅方向を横方向として、シリンダヘッド(１０)の横一側面に吸気分配通路壁(５)を取り付け、排気合流通路壁(２２)内をＥＧＲ弁ケース(１６)を介して吸気分配通路壁(５)内に連通させた、多気筒エンジンにおいて、
図２に例示するように、吸気分配通路壁(５)の上部に吸気入口管(２８)を設け、前後方向のうち、エンジン冷却ファン(４)を配置した方を前、その反対側を後として、この吸気入口管(２８)の周壁後部にＥＧＲ弁ケース取付座(６５)を設け、このＥＧＲ弁ケース取付座(６５)内に吸気入口管(２８)内に至るＥＧＲガス案内通路(６５ｂ)を設け、ＥＧＲ弁ケース取付座(６５)の取付座入口部(６５ａ)にＥＧＲ弁ケース(１６)のＥＧＲ弁ケース出口部(１６ａ)を取り付けてこれらを連通させ、
ＥＧＲガス案内通路(６５ｂ)のＥＧＲガス案内面(６５ｃ)を円筒形の吸気入口管(２８)の内周面(２８ｂ)の接線方向に向け、
図１に例示するように、ＥＧＲ弁ケース取付座(６５)の両横側のうち、シリンダヘッド(１０)から離れた方を横外側として、ＥＧＲ弁ケース取付座(６５)の横外側面の取付座入口部(６５ａ)にＥＧＲ弁ケース(１６)のＥＧＲ弁ケース出口部(１６ａ)を取り付けてこれらを連通させることにより、シリンダ中心軸線(６４)と平行な向きに見た場合に、ＥＧＲ弁ケース(１６)が吸気分配通路壁(５)よりも横外側方に突出するようにし、
図１に例示するように、エンジン冷却ファン(４)の後方にＥＧＲ弁ケース(１６)を配置し、エンジン冷却ファン(４)で起こしたエンジン冷却風がＥＧＲ弁ケース(１６)の周囲を通過するように、
図１に例示するように、ＥＧＲ弁ケース(１６)の前部に弁アクチュエータ(６６)を配置し、エンジン冷却ファン(４)で起こしたエンジン冷却風が弁アクチュエータ(６６)に吹き当たるようにし、
図４に例示するように、エンジンの前方正面から後ろ向きに見て、エンジン冷却ファン(４)と吸気入口管(２８)の周壁前部(２８ｃ)が重なり合い、これらが前後位置で相互に対面するようにし、吸気入口管(２８)の横外側真横の位置に弁アクチュエータ(６６)を配置し、吸気入口管(２８)の周壁前部(２８ｃ)を、弁アクチュエータ(６６)とシリンダヘッド(１０)のヘッドカバー(１１)との間に配置した、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, the intake direction is distributed to one side surface of the cylinder head (10), with the installation direction of the crankshaft (1) being the front-rear direction and the width direction of the cylinder head (10) orthogonal to the front-rear direction In a multi-cylinder engine to which a passage wall (5) is attached and the inside of an exhaust merging passage wall (22) communicates with an intake distribution passage wall (5) through an EGR valve case (16).
As illustrated in FIG. 2, an intake inlet pipe (28) is provided at the upper part of the intake distribution passage wall (5), and in the front-rear direction, the side where the engine cooling fan (4) is arranged is the front and the opposite side is the rear The EGR valve case mounting seat (65) is provided at the rear portion of the peripheral wall of the intake inlet pipe (28), and the EGR gas guide passage (65b) reaching the intake inlet pipe (28) in the EGR valve case mounting seat (65). ), The EGR valve case outlet (16a) of the EGR valve case (16) is attached to the mounting seat inlet (65a) of the EGR valve case mounting seat (65), and these are communicated.
The EGR gas guide surface (65c) of the EGR gas guide passage (65b) is directed in the tangential direction of the inner peripheral surface (28b) of the cylindrical intake inlet pipe (28),
As illustrated in FIG. 1, of both lateral sides of the EGR valve case mounting seat (65), the side away from the cylinder head (10) is defined as the lateral outer side, and the lateral outer side surface of the EGR valve case mounting seat (65) is When the EGR valve case outlet part (16a) of the EGR valve case (16) is attached to the attachment seat inlet part (65a) and communicated with each other, when viewed in a direction parallel to the cylinder center axis (64), The valve case (16) protrudes laterally outward from the intake distribution passage wall (5),
As illustrated in FIG. 1, an EGR valve case (16) is disposed behind the engine cooling fan (4), and the engine cooling air generated by the engine cooling fan (4) passes around the EGR valve case (16). Like
As illustrated in FIG. 1, a valve actuator (66) is disposed at the front of the EGR valve case (16) so that engine cooling air generated by the engine cooling fan (4) blows against the valve actuator (66). ,
As illustrated in FIG. 4, the engine cooling fan (4) and the front portion (28 c) of the peripheral wall of the intake inlet pipe (28) overlap each other when viewed from the front front of the engine and face each other at the front and rear positions. Then, the valve actuator (66) is disposed at a position directly beside the laterally outer side of the intake inlet pipe (28), and the peripheral wall front portion (28c) of the intake inlet pipe (28) is connected to the valve actuator (66) and the cylinder head (10). The multi-cylinder engine is disposed between the head cover (11).

（請求項１に係る発明）
《効果》 ＮＯＸの低減機能を高めることができる。
図２に例示するように、ＥＧＲガス案内通路(６５ｂ)のＥＧＲガス案内面(６５ｃ)を円筒形の吸気入口管(２８)の内周面(２８ｂ)の接線方向に向けたので、ＥＧＲガスがＥＧＲガス案内面(６５ｃ)の案内で、吸気入口管(２８)の内周面の接線方向に導入され、このＥＧＲガスが吸気入口管(２８)の内周面(２８ｂ)に沿って旋回しながら吸気と混合する。このため、吸気とＥＧＲガスとの混合が促進され、各気筒へのＥＧＲガスの分配が均一になる。このため、ＮＯＸの低減機能を高めることができる。 (Invention according to Claim 1)
<< Effect >> The NO X reduction function can be enhanced.
As illustrated in FIG. 2, since the EGR gas guide surface (65c) of the EGR gas guide passage (65b) is directed in the tangential direction of the inner peripheral surface (28b) of the cylindrical intake inlet pipe (28), the EGR gas Is introduced in the tangential direction of the inner peripheral surface of the intake inlet pipe (28) by the guide of the EGR gas guide surface (65c), and this EGR gas swirls along the inner peripheral surface (28b) of the intake inlet pipe (28). While mixing with intake air. For this reason, mixing of the intake air and the EGR gas is promoted, and the distribution of the EGR gas to each cylinder becomes uniform. Therefore, it is possible to enhance the function of reducing NO X.

《効果》 エンジンのコンパクト化を図ることができる。
図２に例示するように、吸気分配通路壁(５)の上部に吸気入口管(２８)を設け、この吸気入口管(２８)の周壁後部にＥＧＲ弁ケース取付座(６５)を設けるので、本来はデッドスペースとなる吸気入口管(２８)の前後空間をＥＧＲ弁ケース取付座(６５)の配置空間として有効利用することができ、エンジンのコンパクト化を図ることができる。 <Effect> The engine can be made compact.
As illustrated in FIG. 2, an intake inlet pipe (28) is provided at the upper part of the intake distribution passage wall (5), and an EGR valve case mounting seat (65) is provided at the rear of the peripheral wall of the intake inlet pipe (28). The space before and after the intake inlet pipe (28), which is originally a dead space, can be effectively used as the space for arranging the EGR valve case mounting seat (65), and the engine can be made compact.

《効果》 ＥＧＲ弁の損傷を抑制することができる。
図２に例示するように、吸気入口管(２８)の周壁後部にＥＧＲ弁ケース取付座(６５)を設け、ＥＧＲ弁ケース取付座(６５)にＥＧＲ弁ケース(１６)を取り付けるので、ＥＧＲ弁の熱がＥＧＲ弁ケースとＥＧＲ弁ケース取付座(６５)とを介して吸気入口管(２８)に放熱される。このため、過熱によるＥＧＲ弁の損傷を抑制することができる。 << Effect >> Damage to the EGR valve can be suppressed.
As illustrated in FIG. 2, an EGR valve case mounting seat (65) is provided at the rear portion of the peripheral wall of the intake inlet pipe (28), and the EGR valve case (16) is mounted on the EGR valve case mounting seat (65). Is radiated to the intake inlet pipe (28) through the EGR valve case and the EGR valve case mounting seat (65). For this reason, damage to the EGR valve due to overheating can be suppressed.

《効果》 ＮＯＸの低減機能をより高めることができる。
図１に例示するように、エンジン冷却ファン(４)の後方にＥＧＲ弁ケース(１６)を配置し、エンジン冷却ファン(４)で起こしたエンジン冷却風がＥＧＲ弁ケース(１６)の周囲を通過するようにしたので、ＥＧＲガスがＥＧＲクーラ(１５)で冷却された後、ＥＧＲ弁ケース(１６)で空冷され、ＥＧＲガスの温度がより低下し、ＮＯＸの低減機能をより高めることができる。 <Effect> The NO X reduction function can be further enhanced.
As illustrated in FIG. 1, an EGR valve case (16) is disposed behind the engine cooling fan (4), and the engine cooling air generated by the engine cooling fan (4) passes around the EGR valve case (16). since the way, after the EGR gas is cooled by the EGR cooler (15), air cooled by the EGR valve case (16), decreases more temperatures of the EGR gas, it is possible to further improve the reducing function of the NO X .

《効果》 ＥＧＲ弁の損傷抑制機能を高めることができる。
ＥＧＲガスがＥＧＲクーラ(１５)で冷却された後、ＥＧＲ弁ケース(１６)で空冷されるので、ＥＧＲガスの温度が低下し、ＥＧＲガスによるＥＧＲ弁の過熱が抑制され、ＥＧＲ弁の損傷抑制機能を高めることができる。 << Effect >> The damage suppression function of the EGR valve can be enhanced.
Since the EGR gas is cooled by the EGR cooler (15) and then cooled by the EGR valve case (16), the temperature of the EGR gas is lowered, the overheating of the EGR valve by the EGR gas is suppressed, and the EGR valve is prevented from being damaged. Function can be enhanced.

《効果》 弁アクチュエータの損傷を抑制することができる。
図１に例示するように、ＥＧＲ弁ケース(１６)の前部に弁アクチュエータ(６６)を配置し、エンジン冷却ファン(４)で起こしたエンジン冷却風が弁アクチュエータ(６６)に吹き当たるようにしたので、ＥＧＲガスによる弁アクチュエータ(６６)の過熱が抑制され、過熱による弁アクチュエータ(６６)の損傷を抑制することができる。 <Effect> Damage to the valve actuator can be suppressed.
As illustrated in FIG. 1, a valve actuator (66) is disposed in the front portion of the EGR valve case (16) so that engine cooling air generated by the engine cooling fan (4) blows against the valve actuator (66). Therefore, overheating of the valve actuator (66) due to EGR gas is suppressed, and damage to the valve actuator (66) due to overheating can be suppressed.

（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》 ＮＯＸの低減機能をより高めることができる。
図１に例示するように、ＥＧＲ弁ケース(１６)に逆止弁ケース(６１)を取り付け、この逆止弁ケース(６１)内の逆止弁でＥＧＲ弁ケース(１６)からＥＧＲクーラ(１５)へのＥＧＲガスの逆流を阻止できるようにしたので、過剰な過給圧等によるＥＧＲガスの逆流が起こらず、適正なＥＧＲ率が確保され、ＮＯＸの低減機能をより高めることができる。 (Invention according to Claim 2 )
In addition to the effect of the invention according to claim 1 , the following effect is achieved.
<Effect> The NO X reduction function can be further enhanced.
As illustrated in FIG. 1, a check valve case (61) is attached to the EGR valve case (16), and the check valve in the check valve case (61) uses the EGR valve case (16) to the EGR cooler (15 ) since it possible to prevent the backflow of EGR gas into, does not occur backflow of EGR gas due to excessive supercharging pressure, etc., proper EGR rate is secured, it is possible to enhance the function of reducing NO X.

（請求項３に係る発明）
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》 ポンプが損傷するのを抑制することができる。
図１に例示するように、ポンプ(７)の真上に逆止弁ケース(６１)を配置したので、エンジンの製造時やメンテナンス時にエンジンの上方で部品や工具等の物体が落下しても、この物体がポンプ(７)に真上から衝突する前に、この物体を逆止弁ケース(６１)で受け止めることができる。このため、真上からの物体の衝突によってポンプ(７)が損傷するのを抑制することができる。 (Invention according to claim 3 )
In addition to the effect of the invention according to claim 2 , the following effect is achieved.
<< Effect >> It can suppress that a pump is damaged.
As illustrated in FIG. 1, since the check valve case (61) is arranged directly above the pump (7), even if an object such as a part or tool falls above the engine during engine manufacture or maintenance, The object can be received by the check valve case (61) before the object collides with the pump (7) from directly above. For this reason, it can suppress that a pump (7) is damaged by the collision of the object from right above.

（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》 エンジンをコンパクトにまとめることができる。
図１、図３に例示するように、吸気分配通路壁(５)の真下の位置で、コモンレール(３)を前後方向に架設したので、本来はデッドスペースとなる吸気分配通路壁(５)の真下の空間をコモンレール(３)の配置空間として有効利用することができ、エンジンをコンパクトにまとめることができる。 (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> The engine can be gathered compactly.
As illustrated in FIGS. 1 and 3, since the common rail (3) is installed in the front-rear direction at a position directly below the intake distribution passage wall (5), the intake distribution passage wall (5) that originally becomes a dead space is provided. The space directly underneath can be used effectively as the arrangement space for the common rail (3), and the engine can be made compact.

《効果》 コモンレールの損傷を抑制することができる。
図１、図３に例示するように、吸気分配通路壁(５)の真下の位置で、コモンレール(３)を前後方向に架設したので、エンジンの製造時やメンテナンス時にエンジンの上方で部品や工具等の物体が落下しても、この物体がコモンレール(３)に真上から衝突する前に、この物体が吸気分配通路壁(５)で受け止められる。このため、上方からの物体の衝突によってコモンレール(３)が損傷するのを抑制することができる。 <Effect> Damage to the common rail can be suppressed.
As illustrated in FIGS. 1 and 3, since the common rail (3) is installed in the front-rear direction at a position directly below the intake distribution passage wall (5), parts and tools are installed above the engine during engine manufacture and maintenance. Even if an object such as an object falls, this object is received by the intake distribution passage wall (5) before the object collides with the common rail (3) from directly above. For this reason, it can suppress that a common rail (3) is damaged by the collision of the object from upper direction.

（請求項５に係る発明）
請求項１から請求項４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》 エンジンをコンパクトにまとめることができる。
図３に例示するように、吸気分配通路壁(５)の真下の位置に電子制御手段(１４)を配置したので、本来はデッドスペースとなる吸気分配通路壁(５)の真下の空間を電子制御手段(１４)の配置空間として有効利用することができ、エンジンをコンパクトにまとめることができる。 (Invention according to claim 5 )
In addition to the effects of the invention according to any one of claims 1 to 4 , the following effects are provided.
<Effect> The engine can be gathered compactly.
As illustrated in FIG. 3, since the electronic control means (14) is disposed at a position directly below the intake distribution passage wall (5), the space immediately below the intake distribution passage wall (5), which is originally a dead space, is electronically disposed. It can be used effectively as an arrangement space for the control means (14), and the engine can be compacted.

《効果》 電子制御手段の損傷を抑制することができる。
図３に例示するように、吸気分配通路壁(５)の真下の位置に電子制御手段(１４)を配置したので、エンジンの製造時やメンテナンス時にエンジンの上方で部品や工具等の物体が落下しても、この物体が電子制御手段(１４)に真上から衝突する前に、この物体が吸気分配通路壁(５)で受け止められる。このため、上方からの物体の衝突によって電子制御手段(１４)が損傷するのを抑制することができる。 << Effect >> Damage to the electronic control means can be suppressed.
As illustrated in FIG. 3, since the electronic control means (14) is disposed immediately below the intake distribution passage wall (5), objects such as parts and tools fall above the engine during engine manufacture and maintenance. Even before this object collides with the electronic control means (14) from directly above, this object is received by the intake distribution passage wall (5). For this reason, it can suppress that an electronic control means (14) is damaged by the collision of the object from upper direction.

本発明の実施の形態を図面に基づいて説明する。図１から図５は本発明の実施形態に係る多気筒エンジンを説明する図で、この実施形態では、立型の直列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. FIGS. 1 to 5 are diagrams for explaining a multi-cylinder engine according to an embodiment of the present invention. In this embodiment, a vertical in-line multi-cylinder diesel engine will be explained.

本発明の実施形態の概要は、次の通りである。
シリンダブロック(２)またはシリンダヘッド(１０)の幅方向を横方向、クランク軸(１)の架設方向を前後方向、前後方向のうち、エンジン冷却ファン(４)のある方を前、その反対側を後、シリンダ中心軸線(６４)の方向を上下方向として、図３に示すように、シリンダブロック(２)の上部にシリンダヘッド(１０)を組み付け、シリンダヘッド(１０)の上部にヘッドカバー(１１)を組み付けている。シリンダブロック(２)の前方にラジエータ(図外)とエンジン冷却ファン(４)とを配置している。このエンジン冷却ファン(４)は、シリンダブロック(２)の前部に配置されたベルト伝動装置(１７)を介してクランク軸(１)で駆動される。 The outline of the embodiment of the present invention is as follows.
The width direction of the cylinder block (2) or the cylinder head (10) is the horizontal direction, the installation direction of the crankshaft (1) is the front-rear direction, and the front-rear direction. Then, as shown in FIG. 3, the cylinder head (10) is assembled to the upper part of the cylinder block (2), and the head cover (11) is attached to the upper part of the cylinder head (10). ). A radiator (not shown) and an engine cooling fan (4) are arranged in front of the cylinder block (2). The engine cooling fan (4) is driven by the crankshaft (1) via a belt transmission (17) disposed at the front of the cylinder block (2).

ＥＧＲ装置の構成は、次の通りである。
図１に示すように、シリンダヘッド(１０)の横一側面に吸気分配通路壁(５)を取り付け、シリンダヘッド(１０)の横他側面に排気合流通路壁(２２)を取り付け、エンジンの後部にＥＧＲクーラ(１５)を横向きに配置し、ＥＧＲクーラ(１５)の排気寄りの端部にクーラ入口部(１５ｂ)を設け、ＥＧＲクーラ(１５)の吸気寄りの端部にクーラ出口部(１５ａ)を設け、クーラ入口部(１５ｂ)を排気合流通路壁(２２)内に連通させ、クーラ出口部(１５ａ)をＥＧＲ弁ケース(１６)を介して吸気分配通路壁(５)内に連通させている。吸気分配通路壁(５)は、吸気マニホルドの機能を果たすものであるが、図１に示すように、分岐管のない箱型構造であるため、このような部品名を用いた。排気合流通路壁(２２)は排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(５)という部品名と対応させてこのような部品名を用いた。排気合流通路壁(２２)の上部には過給機(５４)を取り付けている。シリンダブロック(２)の後部に伝動装置収容部(９)を配置し、この伝動装置収容部(９)の後方にこの伝動装置収容部(９)と隣接してフライホイルハウジング(２９)を設け、このフライホイルハウジング(２９)の真上の位置でＥＧＲクーラ(１５)を横向きに架設している。フライホイルハウジング(２９)の真上の位置とは、シリンダ中心軸線(６４)と平行な向きに見た場合に、フライホイルハウジング(２９)の上方でフライホイルハウジング(２９)と重なる位置をいう。 The configuration of the EGR device is as follows.
As shown in FIG. 1, an intake distribution passage wall (5) is attached to the lateral side surface of the cylinder head (10), and an exhaust merging passage wall (22) is attached to the other lateral side surface of the cylinder head (10). The EGR cooler (15) is disposed horizontally, the cooler inlet (15b) is provided at the end of the EGR cooler (15) near the exhaust, and the cooler outlet (15a) is provided at the end of the EGR cooler (15) near the intake. ), The cooler inlet portion (15b) is communicated with the exhaust confluence passage wall (22), and the cooler outlet portion (15a) is communicated with the intake distribution passage wall (5) via the EGR valve case (16). ing. The intake distribution passage wall (5) functions as an intake manifold. However, as shown in FIG. 1, since it has a box-type structure without a branch pipe, such a part name is used. The exhaust confluence passage wall (22) fulfills the function of the exhaust manifold, and this part name is used in correspondence with the part name of the intake distribution passage wall (5). A supercharger (54) is attached to the upper part of the exhaust merging passage wall (22). A transmission device housing portion (9) is arranged at the rear of the cylinder block (2), and a flywheel housing (29) is provided behind the transmission device housing portion (9) adjacent to the transmission device housing portion (9). The EGR cooler (15) is installed sideways at a position directly above the flywheel housing (29). The position directly above the flywheel housing (29) refers to a position overlapping the flywheel housing (29) above the flywheel housing (29) when viewed in a direction parallel to the cylinder center axis (64). .

ＥＧＲ装置の工夫は、次の通りである。
図１に示すように、吸気分配通路壁(５)の上部に吸気入口管(２８)を設け、前後方向のうち、エンジン冷却ファン(４)を配置した方を前、その反対側を後として、吸気入口管(２８)の周壁後部にＥＧＲ弁ケース取付座(６５)を設けている。ＥＧＲ弁ケース取付座(６５)の両横側のうち、シリンダヘッド(１０)から離れた方を横外側として、ＥＧＲ弁ケース取付座(６５)の横外側面の取付座入口部(６５ａ)にＥＧＲ弁ケース(１６)のＥＧＲ弁ケース出口部(１６ａ)を取り付けてこれらを連通させている。これにより、シリンダ中心軸線(６４)と平行な向きに見た場合に、ＥＧＲ弁ケース(１６)が吸気分配通路壁(５)よりも横外側方に突出するようにしている。吸気入口管(２８)は過給通路(２８ａ)を介して過給機(５４)に連通させている。 The device of the EGR device is as follows.
As shown in FIG. 1, an intake inlet pipe (28) is provided at the upper part of the intake distribution passage wall (5), and the direction in which the engine cooling fan (4) is arranged in the front-rear direction is the front and the opposite side is the rear. An EGR valve case mounting seat (65) is provided at the rear portion of the peripheral wall of the intake inlet pipe (28). Of the lateral sides of the EGR valve case mounting seat (65), the side away from the cylinder head (10) is defined as the lateral outer side, and the mounting seat inlet (65a) on the lateral outer surface of the EGR valve case mounting seat (65) is provided. An EGR valve case outlet portion (16a) of the EGR valve case (16) is attached to communicate these. Thus, when viewed in a direction parallel to the cylinder center axis (64), the EGR valve case (16) protrudes laterally outward from the intake distribution passage wall (5) . The intake inlet pipe (28) communicates with the supercharger (54) through the supercharging passage (28a).

図１に示すように、エンジン冷却ファン(４)の後方にＥＧＲ弁ケース(１６)を配置し、エンジン冷却ファン(４)で起こしたエンジン冷却風がＥＧＲ弁ケース(１６)の周囲を通過するようにしている。ＥＧＲ弁ケース(１６)の前部に弁アクチュエータ(６６)を配置し、エンジン冷却ファン(４)で起こしたエンジン冷却風が弁アクチュエータ(６６)に吹き当たるようにしている。図４に示すように、エンジンの前方正面から後ろ向きに見て、エンジン冷却ファン(４)と吸気入口管(２８)の周壁前部(２８ｃ)が重なり合い、これらが前後位置で相互に対面するようにし、吸気入口管(２８)の横外側真横の位置に弁アクチュエータ(６６)を配置し、吸気入口管(２８)の周壁前部(２８ｃ)を、弁アクチュエータ(６６)とシリンダヘッド(１０)のヘッドカバー(１１)との間に配置している。
図２に示すように、ＥＧＲガス案内通路(６５ｂ)のＥＧＲガス案内面(６５ｃ)を円筒形の吸気入口管(２８)の内周面(２８ｂ)の接線方向に向けている。ＥＧＲ弁ケース(１６)に逆止弁ケース(６１)を取り付け、この逆止弁ケース(６１)内の逆止弁でＥＧＲ弁ケース(１６)からＥＧＲクーラ(１５)へのＥＧＲガスの逆流を阻止できるようにしている。この逆止弁ケース(６１)はＥＧＲ弁ケース(１６)の後部で、エンジン冷却ファン(４)の後方に配置し、エンジン冷却ファン(４)で起こしたエンジン冷却風が逆止弁ケース(６１)の周囲を通過するようになっている。このため、ＥＧＲガスがＥＧＲクーラ(１５)で冷却された後、逆止弁ケース(６１)で空冷されるので、ＥＧＲガスの温度が低下し、ＥＧＲガスによる逆止弁とＥＧＲ弁の過熱が抑制され、これらの損傷抑制機能をより高めることができる。 As shown in FIG. 1, an EGR valve case (16) is arranged behind the engine cooling fan (4), and the engine cooling air generated by the engine cooling fan (4) passes around the EGR valve case (16). I am doing so. A valve actuator (66) is arranged at the front of the EGR valve case (16) so that engine cooling air generated by the engine cooling fan (4) blows against the valve actuator (66). As shown in FIG. 4, the engine cooling fan (4) and the peripheral wall front part (28 c) of the intake inlet pipe (28) overlap each other when viewed from the front front side of the engine and face each other at the front and rear positions. The valve actuator (66) is disposed at a position directly laterally outside the intake inlet pipe (28), and the peripheral wall front part (28c) of the intake inlet pipe (28) is connected to the valve actuator (66) and the cylinder head (10). Between the head cover (11).
As shown in FIG. 2, the EGR gas guide surface (65c) of the EGR gas guide passage (65b) is directed in the tangential direction of the inner peripheral surface (28b) of the cylindrical intake inlet pipe (28). A check valve case (61) is attached to the EGR valve case (16), and the check valve in the check valve case (61) allows EGR gas backflow from the EGR valve case (16) to the EGR cooler (15). I try to prevent it. This check valve case (61) is disposed at the rear of the EGR valve case (16) and behind the engine cooling fan (4), and the engine cooling air generated by the engine cooling fan (4) is caused by the check valve case (61). ) Pass around. For this reason, since the EGR gas is cooled by the EGR cooler (15) and then air-cooled by the check valve case (61), the temperature of the EGR gas decreases, and the check valve and the EGR valve are overheated by the EGR gas. It is suppressed and these damage suppressing functions can be further enhanced.

図１、図４に示すように、シリンダブロック(２)の後部に伝動装置収容部(９)を配置し、この伝動装置収容部(９)をシリンダブロック(２)よりも横外側方に突出させ、この横突出部分(９ａ)の前面に伝動装置(８)で駆動される燃料圧送用の燃料サプライポンプ(７)を取り付け、この燃料サプライポンプ(７)の真上に逆止弁ケース(１６)を配置している。燃料サプライポンプ(７)の真上の位置とは、シリンダ中心軸線(６４)と平行な向きに見た場合に、燃料サプライポンプ(７)の上方で燃料サプライポンプ(７)と重なる位置をいう。燃料サプライポンプ(７)は、コモンレール(３)に燃料を供給する。伝動装置(８)はタイミングギヤトレインである。   As shown in FIGS. 1 and 4, a transmission device housing portion (9) is arranged at the rear of the cylinder block (2), and the transmission device housing portion (9) protrudes laterally outward from the cylinder block (2). A fuel supply pump (7) for fuel pressure driven by the transmission (8) is attached to the front surface of the laterally projecting portion (9a), and a check valve case ( 16) is arranged. The position directly above the fuel supply pump (7) is a position overlapping the fuel supply pump (7) above the fuel supply pump (7) when viewed in a direction parallel to the cylinder center axis (64). . The fuel supply pump (7) supplies fuel to the common rail (3). The transmission (8) is a timing gear train.

ＥＧＲ装置を構成する剛性連結体の構成は、次の通りである。
図１、図３、図４に示すように、吸気分配通路壁(５)とＥＧＲ弁ケース(１６)とＥＧＲクーラ(１５)とを剛性連結体の構成要素とし、これら構成要素で可撓性のない剛性連結体を構成している。ＥＧＲ弁ケース取付座(６５)の横外側面の取付座入口部(６５ａ)にＥＧＲ弁ケース(１６)の横側面のＥＧＲ弁ケース出口部(１６ａ)を取り付けてこれらを連通させ、ＥＧＲ弁ケース(１６)の後方に上下方向に延びる接続管(６０)を配置し、この接続管(６０)の前面上部の接続管出口部(６０ａ)をＥＧＲ弁ケース(１６)の後面のＥＧＲ弁ケース入口部(１６ｂ)と対向させてこれらを連通させ、接続管(６０)の下部の接続管入口部(６０ｂ)を排気合流通路壁(２２)のある横側方に向け、この横向きの接続管入口部(６０ｂ)にＥＧＲクーラ(１５)の横一端部のクーラ出口部(１５ａ)を取り付けてこれらを連通させ、吸気分配通路壁(５)とＥＧＲ弁ケース(１６)と接続管(６０)とＥＧＲクーラ(１５)とを剛性連結体の構成要素とし、これら構成要素で可撓性のない剛性連結体を構成している。接続管(６０)はＥＧＲクーラ(１５)から導出されている。 The structure of the rigid coupling body constituting the EGR device is as follows.
As shown in FIGS. 1, 3 and 4, the intake distribution passage wall (5), the EGR valve case (16), and the EGR cooler (15) are components of a rigid connector, and these components are flexible. This constitutes a rigid connected body without any other. An EGR valve case outlet (16a) on the lateral side surface of the EGR valve case (16) is attached to the mounting seat inlet portion (65a) on the lateral outer surface of the EGR valve case mounting seat (65) so that they communicate with each other. A connecting pipe (60) extending in the vertical direction is arranged behind (16), and the connecting pipe outlet (60a) at the upper front of the connecting pipe (60) is connected to the EGR valve case inlet on the rear surface of the EGR valve case (16). These are communicated with each other so as to face the part (16b), and the connection pipe inlet part (60b) at the lower part of the connection pipe (60) is directed to the lateral side where the exhaust merging passage wall (22) is located. The cooler outlet portion (15a) at the lateral end of the EGR cooler (15) is attached to the portion (60b) so as to communicate with each other, and the intake distribution passage wall (5), the EGR valve case (16), the connecting pipe (60), The EGR cooler (15) is a component of a rigid connector, and these components are not flexible. It constitutes a sex connector. The connecting pipe (60) is led out from the EGR cooler (15).

図１、図３に示すように、ＥＧＲ弁ケース(１６)と接続管(６０)との間に逆止弁ケース(６１)を介在させ、ＥＧＲ弁ケース(１６)の後面のＥＧＲ弁ケース入口部(１６ｂ)に逆止弁ケース(６１)の前面の逆止弁ケース出口部(６１ａ)を取り付けてこれらを連通させ、この逆止弁ケース(６１)の後面の逆止弁ケース入口部(６１ｂ)に接続管(６０)の前面上部の接続管出口部(６０ａ)を取り付けてこれらを連通させることにより、逆止弁ケース(６１)も剛性連結体の構成要素とし、逆止弁ケース(６１)内の逆止弁で、ＥＧＲ弁ケース(１６)からＥＧＲクーラ(１５)側へのＥＧＲガスの逆流を阻止するようにしている。   As shown in FIGS. 1 and 3, a check valve case (61) is interposed between the EGR valve case (16) and the connecting pipe (60), and the EGR valve case inlet on the rear surface of the EGR valve case (16). A check valve case outlet (61a) on the front surface of the check valve case (61) is attached to the portion (16b) so that they communicate with each other, and a check valve case inlet ( 61b) is connected to the connecting pipe outlet portion (60a) at the upper front of the connecting pipe (60) and communicated with them, so that the check valve case (61) is also a component of the rigid coupling body. The check valve in 61) prevents the backflow of EGR gas from the EGR valve case (16) to the EGR cooler (15) side.

ＥＧＲクーラの支持構造は、次の通りである。
排気合流通路壁(２２)にＥＧＲガス導出管(６２)を一体成型で形成し、このＥＧＲガス導出管(６２)の導出端(６２ａ)にＥＧＲクーラ(１５)の端部のクーラ入口部(１５ｂ)を取り付けてこれらを連通させることにより、ＥＧＲクーラ(１５)を排気合流通路壁(２２)と剛性連結体の他の部品(ＥＧＲクーラ以外の部品)とを介してシリンダヘッド(１０)に支持させている。 The support structure of the EGR cooler is as follows.
An EGR gas outlet pipe (62) is formed integrally with the exhaust confluence passage wall (22), and a cooler inlet (62a) of the EGR cooler (15) is connected to the outlet end (62a) of the EGR gas outlet pipe (62). 15b) is attached and communicated with each other, whereby the EGR cooler (15) is connected to the cylinder head (10) via the exhaust merging passage wall (22) and other parts (parts other than the EGR cooler) of the rigid coupling body. I support it.

他の工夫は、次の通りである。
図１、図３に示すように、吸気分配通路壁(５)の真下の位置で、コモンレール(３)を前後方向に架設している。吸気分配通路壁(５)の真下の位置に電子制御手段(１４)を配置している。この電子制御手段(１４)はマイコンであり、コモンレール(３)から燃料の圧送を受ける燃料噴射弁の開閉を制御し、燃料噴射のタイミングや量を制御する。吸気分配通路壁(５)は枝管のない箱型構造で、枝管の隙間から異物が落下しないようにしている。吸気分配通路壁(５)の真下の位置とは、図１に示すように、シリンダ中心軸線(６４)と平行な向きに見た場合に、吸気分配通路壁(５)の下方で吸気分配通路壁(５)と重なる位置をいう。コモンレール(３)と電子制御手段(１４)とは、シリンダ中心軸線(６４)と平行な向きに見た場合に、吸気分配通路壁(５)から横にはみ出さない位置に配置している。 Other ideas are as follows.
As shown in FIGS. 1 and 3, the common rail (3) is installed in the front-rear direction at a position directly below the intake distribution passage wall (5). Electronic control means (14) is arranged at a position directly below the intake distribution passage wall (5). This electronic control means (14) is a microcomputer, which controls the opening and closing of the fuel injection valve that receives the fuel pressure from the common rail (3), and controls the timing and amount of fuel injection. The intake distribution passage wall (5) has a box structure without a branch pipe, and prevents foreign matter from dropping from the gap between the branch pipes. As shown in FIG. 1, the position directly below the intake distribution passage wall (5) is the intake distribution passage below the intake distribution passage wall (5) when viewed in a direction parallel to the cylinder center axis (64). The position that overlaps the wall (5). The common rail (3) and the electronic control means (14) are arranged at positions that do not protrude laterally from the intake distribution passage wall (5) when viewed in a direction parallel to the cylinder central axis (64).

本発明の実施形態に係る多気筒エンジンの平面図である。1 is a plan view of a multi-cylinder engine according to an embodiment of the present invention. 図１のエンジンの吸気入口管とＥＧＲ弁ケース取付座の横断平面図である。FIG. 2 is a cross-sectional plan view of an intake inlet pipe and an EGR valve case mounting seat of the engine of FIG. 図１のエンジンの左側面図である。It is a left view of the engine of FIG. 図１のエンジンの正面図である。It is a front view of the engine of FIG. 図１のエンジンの背面図である。It is a rear view of the engine of FIG.

(１) クランク軸
(３) コモンレール
(４) エンジン冷却ファン
(５) 吸気分配通路壁
(７) 燃料サプライポンプ
(１０) シリンダヘッド
(１４) 電子制御手段
(１６) ＥＧＲ弁ケース
(１６ａ) ＥＧＲ弁ケース出口部
(１６ｂ) ＥＧＲ弁ケース入口部
(２２) 排気合流通路壁
(２８) 吸気入口管
(２８ｂ) 内周面
(６５) ＥＧＲ弁ケース取付座
(６５ａ) 取付座入口部
(６５ｂ) ＥＧＲガス案内通路
(６５ｃ) ＥＧＲガス案内面
(６６) 弁アクチュエータ (1) Crankshaft
(3) Common rail
(4) Engine cooling fan
(5) Intake distribution passage wall
(7) Fuel supply pump
(10) Cylinder head
(14) Electronic control means
(16) EGR valve case
(16a) EGR valve case outlet
(16b) EGR valve case inlet
(22) Exhaust merge passage wall
(28) Intake inlet pipe
(28b) Inner peripheral surface
(65) EGR valve case mounting seat
(65a) Mounting seat entrance
(65b) EGR gas guide passage
(65c) EGR gas guide surface
(66) Valve actuator

Claims (5)

クランク軸(１)の架設方向を前後方向、前後方向と直交するシリンダヘッド(１０)の幅方向を横方向として、シリンダヘッド(１０)の横一側面に吸気分配通路壁(５)を取り付け、排気合流通路壁(２２)内をＥＧＲ弁ケース(１６)を介して吸気分配通路壁(５)内に連通させた、多気筒エンジンにおいて、
吸気分配通路壁(５)の上部に吸気入口管(２８)を設け、前後方向のうち、エンジン冷却ファン(４)を配置した方を前、その反対側を後として、この吸気入口管(２８)の周壁後部にＥＧＲ弁ケース取付座(６５)を設け、このＥＧＲ弁ケース取付座(６５)内に吸気入口管(２８)内に至るＥＧＲガス案内通路(６５ｂ)を設け、ＥＧＲ弁ケース取付座(６５)の取付座入口部(６５ａ)にＥＧＲ弁ケース(１６)のＥＧＲ弁ケース出口部(１６ａ)を取り付けてこれらを連通させ、
ＥＧＲガス案内通路(６５ｂ)のＥＧＲガス案内面(６５ｃ)を円筒形の吸気入口管(２８)の内周面(２８ｂ)の接線方向に向け、
ＥＧＲ弁ケース取付座(６５)の両横側のうち、シリンダヘッド(１０)から離れた方を横外側として、ＥＧＲ弁ケース取付座(６５)の横外側面の取付座入口部(６５ａ)にＥＧＲ弁ケース(１６)のＥＧＲ弁ケース出口部(１６ａ)を取り付けてこれらを連通させることにより、シリンダ中心軸線(６４)と平行な向きに見た場合に、ＥＧＲ弁ケース(１６)が吸気分配通路壁(５)よりも横外側方に突出するようにし、
エンジン冷却ファン(４)の後方にＥＧＲ弁ケース(１６)を配置し、エンジン冷却ファン(４)で起こしたエンジン冷却風がＥＧＲ弁ケース(１６)の周囲を通過するようにし、
ＥＧＲ弁ケース(１６)の前部に弁アクチュエータ(６６)を配置し、エンジン冷却ファン(４)で起こしたエンジン冷却風が弁アクチュエータ(６６)に吹き当たるようにし、
エンジンの前方正面から後ろ向きに見て、エンジン冷却ファン(４)と吸気入口管(２８)の周壁前部(２８ｃ)が重なり合い、これらが前後位置で相互に対面するようにし、吸気入口管(２８)の横外側真横の位置に弁アクチュエータ(６６)を配置し、吸気入口管(２８)の周壁前部(２８ｃ)を、弁アクチュエータ(６６)とシリンダヘッド(１０)のヘッドカバー(１１)との間に配置した、ことを特徴とする多気筒エンジン。 An intake distribution passage wall (5) is attached to a lateral side surface of the cylinder head (10) with the installation direction of the crankshaft (1) as the front-rear direction and the width direction of the cylinder head (10) perpendicular to the front-rear direction as the lateral direction. In the multi-cylinder engine in which the exhaust merge passage wall (22) communicates with the intake distribution passage wall (5) through the EGR valve case (16).
An intake inlet pipe (28) is provided in the upper part of the intake distribution passage wall (5), and the intake inlet pipe (28) is provided with the front of the engine cooling fan (4) disposed in the front-rear direction and the opposite side as the rear. ) Is provided with an EGR valve case mounting seat (65) at the rear of the peripheral wall, and an EGR gas guide passage (65b) extending into the intake inlet pipe (28) is provided in the EGR valve case mounting seat (65). The EGR valve case outlet part (16a) of the EGR valve case (16) is attached to the attachment seat inlet part (65a) of the seat (65) to communicate with each other,
The EGR gas guide surface (65c) of the EGR gas guide passage (65b) is directed in the tangential direction of the inner peripheral surface (28b) of the cylindrical intake inlet pipe (28),
Of the lateral sides of the EGR valve case mounting seat (65), the side away from the cylinder head (10) is defined as the lateral outer side, and the mounting seat inlet (65a) on the lateral outer surface of the EGR valve case mounting seat (65) is provided. By attaching the EGR valve case outlet part (16a) of the EGR valve case (16) and communicating them, the EGR valve case (16) is distributed in the intake direction when viewed in a direction parallel to the cylinder center axis (64). Projecting laterally outward from the passage wall (5),
An EGR valve case (16) is arranged behind the engine cooling fan (4) so that the engine cooling air generated by the engine cooling fan (4) passes around the EGR valve case (16).
A valve actuator (66) is arranged in front of the EGR valve case (16) so that engine cooling air generated by the engine cooling fan (4) blows against the valve actuator (66),
The engine cooling fan (4) and the front part (28c) of the peripheral wall of the intake inlet pipe (28) overlap with each other when viewed from the front front of the engine, so that they face each other at the front and rear positions. The valve actuator (66) is arranged at a position directly beside the outer side of the outer peripheral wall), and the peripheral wall front portion (28c) of the intake inlet pipe (28) is connected to the valve actuator (66) and the head cover (11) of the cylinder head (10). A multi-cylinder engine characterized by being placed between them. 請求項１に記載した多気筒エンジンにおいて、
ＥＧＲ弁ケース(１６)に逆止弁ケース(６１)を取り付け、この逆止弁ケース(６１)内の逆止弁でＥＧＲ弁ケース(１６)からＥＧＲクーラ(１５)へのＥＧＲガスの逆流を阻止できるようにした、ことを特徴とする多気筒エンジン。 The multi-cylinder engine according to claim 1 ,
A check valve case (61) is attached to the EGR valve case (16), and the check valve in the check valve case (61) allows EGR gas backflow from the EGR valve case (16) to the EGR cooler (15). A multi-cylinder engine that can be blocked. 請求項２に記載した多気筒エンジンにおいて、
シリンダブロック(２)の後部に伝動装置収容部(９)を配置し、この伝動装置収容部(９)をシリンダブロック(２)よりも横外側方に突出させ、この横突出部分(９ａ)の前面に伝動装置(８)で駆動される燃料圧送用のポンプ(７)を取り付け、
このポンプ(７)の真上に逆止弁ケース(６１)を配置した、ことを特徴とする多気筒エンジン。 The multi-cylinder engine according to claim 2 ,
A transmission device accommodating portion (9) is disposed at the rear of the cylinder block (2), and the transmission device accommodating portion (9) is projected laterally outward from the cylinder block (2). A fuel pressure pump (7) driven by a transmission (8) is attached to the front,
A multi-cylinder engine comprising a check valve case (61) disposed directly above the pump (7). 請求項１から請求項３のいずれかに記載した多気筒エンジンにおいて、
吸気分配通路壁(５)の真下の位置で、コモンレール(３)を前後方向に架設した、ことを特徴と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 a common rail (3) is installed in the front-rear direction at a position directly below the intake distribution passage wall (5). 請求項１から請求項４のいずれかに記載した多気筒エンジンにおいて、
吸気分配通路壁(５)の真下の位置に電子制御手段(１４)を配置した、ことを特徴とする多気筒エンジン。 The multi-cylinder engine according to any one of claims 1 to 4 ,
A multi-cylinder engine characterized in that an electronic control means (14) is arranged at a position directly below an intake distribution passage wall (5).
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