JP2009228645A - Engine - Google Patents

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JP2009228645A
JP2009228645A JP2008078296A JP2008078296A JP2009228645A JP 2009228645 A JP2009228645 A JP 2009228645A JP 2008078296 A JP2008078296 A JP 2008078296A JP 2008078296 A JP2008078296 A JP 2008078296A JP 2009228645 A JP2009228645 A JP 2009228645A
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gas supply
supply pipe
egr gas
engine
egr
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Manabu Miyazaki
学 宮▲崎▼
Kiyoshi Hataura
潔 畑浦
Kazuyuki Chuma
和幸 中馬
Mitsuru Kamiyama
満 上山
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Kubota Corp
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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

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine inhibiting vibration of an EGR gas supply pipe and simplifying the structure of the EGR gas supply pipe. <P>SOLUTION: In the engine connecting an exhaust side and an intake side by an EGR gas supply pipe 41, and having each end part 42, 43 of the EGR gas supply pipe 41 fixed to an engine component, a support stay 46 is disposed at a middle part 41a of the EGR gas supply pipe 41, the support stay 46 is composed of a strip metal plate, a base end part 47 is formed flat, a middle part 48 is folded back in an annular shape, an end part 49 is formed flat, the middle part 48 is externally fitted on the middle part 41a of the EGR gas supply pipe 41, and the end part 49 and the base end part 47 are overlapped and fastened on the engine component 51 by a fastener 50. The middle part 41a of the EGR gas supply pipe 41 is gripped by the middle part 48. A non-contact part 52 separated from a circumference surface of the middle part 41a of the EGR gas supply pipe 41 is formed on the middle part 48. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、エンジンに関し、詳しくは、ＥＧＲガス供給パイプの振動を抑制できるとともにＥＧＲガス供給パイプの構造を簡易化することができるエンジンに関するものである。   The present invention relates to an engine, and more particularly to an engine that can suppress vibration of an EGR gas supply pipe and simplify the structure of the EGR gas supply pipe.

従来のエンジンとして、本発明と同様、排気側と吸気側とをＥＧＲガス供給パイプで結び、ＥＧＲガス供給パイプの両端部をエンジン部品に固定したものがある(例えば、特許文献１、２参照)。この種のエンジンでは、排気の一部をＥＧＲガスとして吸気側に還流させ、燃焼室での最高燃焼温度を低下させ、ＮＯＸの低減を図ることができる。 As in the present invention, there is a conventional engine in which the exhaust side and the intake side are connected by an EGR gas supply pipe, and both ends of the EGR gas supply pipe are fixed to engine parts (for example, see Patent Documents 1 and 2). . In this type of engine, a part of the exhaust gas can be recirculated to the intake side as EGR gas, the maximum combustion temperature in the combustion chamber can be lowered, and NO X can be reduced.

しかし、従来のエンジンでは、ＥＧＲガス供給パイプの途中に金属ベローズを配置することにより、ＥＧＲガス供給パイプの振動を抑制しているため、問題がある。   However, the conventional engine has a problem since the vibration of the EGR gas supply pipe is suppressed by arranging the metal bellows in the middle of the EGR gas supply pipe.

特開８−２１８９５０号公報(図２参照)JP-A-8-218950 (see FIG. 2) 特開２００２−１３４４２号公報(図１、図２参照)Japanese Patent Laid-Open No. 2002-13442 (see FIGS. 1 and 2)

上記従来技術では、次の問題がある。
《問題》 ＥＧＲガス供給パイプの構造が複雑化する。
ＥＧＲガス供給パイプの途中に金属ベローズを配置することにより、ＥＧＲガス供給パイプの振動を抑制しているため、ＥＧＲガス供給パイプの構造が複雑化する。 The above prior art has the following problems.
<< Problem >> The structure of the EGR gas supply pipe is complicated.
Since the vibration of the EGR gas supply pipe is suppressed by arranging the metal bellows in the middle of the EGR gas supply pipe, the structure of the EGR gas supply pipe is complicated.

本発明は、上記問題点を解決することができるエンジン、すなわち、ＥＧＲガス供給パイプの振動を抑制できるとともにＥＧＲガス供給パイプの構造を簡易化することができる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 an engine that can solve the above-described problems, that is, an engine that can suppress the vibration of the EGR gas supply pipe and can simplify the structure of the EGR gas supply pipe.

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３に例示するように、排気側と吸気側とをＥＧＲガス供給パイプ(４１)で結び、ＥＧＲガス供給パイプ(４１)の各端部(４２)(４３)をエンジン部品(４４)(４５)に固定したエンジンにおいて、
図１(Ａ)に例示するように、ＥＧＲガス供給パイプ(４１)の途中部(４１ａ)に支持ステー(４６)を配置し、この支持ステー(４６)を帯状金属板で構成し、図１(Ｂ)に例示するように、帯状金属板の基端部(４７)を平に形成し、帯状金属板の中間部(４８)を環状に折り返し、帯状金属板の先端部(４９)を平に形成し、中間部(４８)をＥＧＲガス供給パイプ(４１)の途中部(４１ａ)に外嵌させ、先端部(４９)と基端部(４７)とを重ねて、締結具(５０)でエンジン部品(５１)に締結固定することにより、中間部(４８)でＥＧＲガス供給パイプ(４１)の途中部(４１ａ)を挟み付け、中間部(４８)にＥＧＲガス供給パイプ(４１)の途中部(４１ａ)の周面から離れた非接触部(５２)を形成した、ことを特徴とするエンジン。 Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 3, the exhaust side and the intake side are connected by an EGR gas supply pipe (41), and each end portion (42) (43) of the EGR gas supply pipe (41) is connected to an engine component (44) (45 )
As illustrated in FIG. 1 (A), a support stay (46) is disposed in the middle portion (41a) of the EGR gas supply pipe (41), and the support stay (46) is formed of a strip-shaped metal plate. As illustrated in (B), the base end portion (47) of the strip-shaped metal plate is formed flat, the middle portion (48) of the strip-shaped metal plate is folded back into an annular shape, and the tip end portion (49) of the strip-shaped metal plate is flattened. The intermediate portion (48) is externally fitted to the middle portion (41a) of the EGR gas supply pipe (41), the distal end portion (49) and the base end portion (47) are overlapped, and the fastener (50) The intermediate part (48) sandwiches the middle part (41a) of the EGR gas supply pipe (41) and the intermediate part (48) of the EGR gas supply pipe (41) An engine characterized in that a non-contact part (52) separated from the peripheral surface of the intermediate part (41a) is formed.

（請求項１に係る発明）
《効果》 ＥＧＲガス供給パイプの振動を抑制できるとともにＥＧＲガス供給パイプの構造を簡易化することができる。
図１(Ａ)に例示するように、ＥＧＲガス供給パイプ(４１)の途中部(４１ａ)が支持ステー(４６)でエンジン部品(５１)に固定されるので、ＥＧＲガス供給パイプ(４１)の振動を抑制することができる。また、図１(Ｂ)に例示するように、非接触部(５２)に変形の余地があるため、エンジンの振動でＥＧＲガス供給パイプ(４１)の中途部(４１ａ)と支持ステー(４６)にかかる応力は、非接触部(５２)の変形によって緩和され、ＥＧＲガス供給パイプ(４１)と支持ステー(４６)の損傷が抑制される。このため、ＥＧＲガス供給パイプ(４１)に応力の緩衝構造を必要とせず、ＥＧＲガス供給パイプ(４１)の構造を簡易化することができる。 (Invention according to Claim 1)
<< Effect >> The vibration of the EGR gas supply pipe can be suppressed and the structure of the EGR gas supply pipe can be simplified.
As illustrated in FIG. 1 (A), the middle portion (41a) of the EGR gas supply pipe (41) is fixed to the engine component (51) by the support stay (46), so that the EGR gas supply pipe (41) Vibration can be suppressed. Further, as illustrated in FIG. 1B, since there is room for deformation in the non-contact portion (52), the middle portion (41a) of the EGR gas supply pipe (41) and the support stay (46) are caused by engine vibration. Is relieved by deformation of the non-contact portion (52), and damage to the EGR gas supply pipe (41) and the support stay (46) is suppressed. For this reason, the EGR gas supply pipe (41) does not require a stress buffering structure, and the structure of the EGR gas supply pipe (41) can be simplified.

《効果》 ＥＧＲガス供給パイプへの支持ステーの溶接やロウ付けが不要になる。
図１(Ｂ)に例示するように、中間部(４８)でＥＧＲガス供給パイプ(４１)の途中部(４１ａ)を挟み付けるので、ＥＧＲガス供給パイプ(４１)への支持ステー(４６)の溶接やロウ付けが不要になる。 <Effect> It is not necessary to weld or braze the support stay to the EGR gas supply pipe.
As illustrated in FIG. 1B, the middle portion (41a) of the EGR gas supply pipe (41) is sandwiched by the intermediate portion (48), so that the support stay (46) of the EGR gas supply pipe (41) No welding or brazing is required.

（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》 エンジンへのＥＧＲガス供給パイプの組み付けが容易になる。
図１(Ｂ)に例示するように、支持ステー(４６)をエンジン部品(５１)に取り付ける前に、支持ステー(４６)をＥＧＲガス供給パイプ(４１)の途中部(４１ａ)に摩擦固定できるようにしたので、ＥＧＲガス供給パイプ(４１)に支持ステー(４６)を仮止めしてエンジンの組み立てラインに供給することができ、エンジンへのＥＧＲガス供給パイプ(４１)の組み付けが容易になる。 (Invention according to Claim 2)
In addition to the effect of the invention according to claim 1, the following effect is achieved.
<Effect> The EGR gas supply pipe can be easily assembled to the engine.
As shown in FIG. 1B, the support stay (46) can be frictionally fixed to the middle portion (41a) of the EGR gas supply pipe (41) before the support stay (46) is attached to the engine component (51). Thus, the support stay (46) can be temporarily fixed to the EGR gas supply pipe (41) and supplied to the engine assembly line, and the assembly of the EGR gas supply pipe (41) to the engine becomes easy. .

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６は本発明の実施形態に係るエンジンを説明する図で、この実施形態では、水冷の立型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 6 are diagrams for explaining an engine according to an embodiment of the present invention. In this embodiment, a water-cooled vertical in-line 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４から図６に示すように、シリンダブロック(５)の上部にシリンダヘッド(１)を組み付け、シリンダヘッド(１)の上部にヘッドカバー(２２)を組み付けている。シリンダブロック(５)の下部にはオイルパン(２３)を、シリンダブロック(５)の前部にはギヤケース(２４)を、シリンダブロック(５)の後部にはフライホイルハウジング(２５)をそれぞれ組み付けている。 The outline of the embodiment of the present invention is as follows.
As shown in FIGS. 4 to 6, the cylinder head (1) is assembled to the upper part of the cylinder block (5), and the head cover (22) is assembled to the upper part of the cylinder head (1). An oil pan (23) is assembled at the bottom of the cylinder block (5), a gear case (24) is assembled at the front of the cylinder block (5), and a flywheel housing (25) is assembled at the rear of the cylinder block (5). ing.

ギヤケース(２４)の上方でシリンダブロック(５)に冷却水ポンプ(１７)を取り付け、この冷却水ポンプ(１７)の入力軸にエンジン冷却ファン(６)を取り付けている。この冷却水ポンプ(１７)とエンジン冷却ファン(６)とは、クランク軸からベルト伝動装置(図外)を介して駆動される。エンジン冷却ファン(６)の前方にはラジエータ(図外)が配置され、エンジン冷却ファン(６)が回転すると、ラジエータの前方からラジエータに冷却風が吸い込まれ、このラジエータの冷却排風がエンジン冷却風となる。   A cooling water pump (17) is attached to the cylinder block (5) above the gear case (24), and an engine cooling fan (6) is attached to the input shaft of the cooling water pump (17). The cooling water pump (17) and the engine cooling fan (6) are driven from the crankshaft via a belt transmission (not shown). A radiator (not shown) is arranged in front of the engine cooling fan (6). When the engine cooling fan (6) rotates, cooling air is sucked into the radiator from the front of the radiator, and the cooling exhaust air from the radiator is cooled by the engine. Become a wind.

このエンジンは、ＥＧＲ装置とコモンレール式燃料噴射装置とを備えている。ＥＧＲ装置は、排気の一部を吸気に還元する。コモンレール式燃料噴射装置は、燃料サプライポンプ(１６)で昇圧した燃料をコモンレール(１０)に蓄圧し、電子制御でインジェクタの電磁弁を開閉し、各気筒の燃料噴射時期燃料噴射量を調節する。   This engine includes an EGR device and a common rail fuel injection device. The EGR device returns a part of the exhaust to intake air. The common rail fuel injection device accumulates the fuel boosted by the fuel supply pump (16) in the common rail (10), opens and closes the electromagnetic valve of the injector by electronic control, and adjusts the fuel injection timing fuel injection amount of each cylinder.

ＥＧＲ装置の工夫は、次の通りである。
図３に示すように、クランク軸の架設方向を前後方向とし、この前後方向と直交するシリンダヘッド(１)の幅方向を横方向として、シリンダヘッド(１)の左側面に吸気分配通路壁(２)を取り付け、シリンダヘッド(１)の右側面に排気合流通路壁(３)を取り付け、排気合流通路と吸気分配通路との間にＥＧＲクーラ(４)を介在させている。吸気分配通路壁(２)は吸気マニホールドである。排気合流通路壁(３)は排気マニホールドである。 The device of the EGR device is as follows.
As shown in FIG. 3, an intake distribution passage wall (on the left side surface of the cylinder head (1) is defined with the direction in which the crankshaft is installed as the front-rear direction and the width direction of the cylinder head (1) perpendicular to the front-rear direction as the lateral direction. 2) is attached, an exhaust merging passage wall (3) is attached to the right side surface of the cylinder head (1), and an EGR cooler (4) is interposed between the exhaust merging passage and the intake distribution passage. The intake distribution passage wall (2) is an intake manifold. The exhaust merging passage wall (3) is an exhaust manifold.

図３から図５に例示するように、シリンダブロック(５)の横でＥＧＲクーラ(４)を前後方向に架設し、このＥＧＲクーラ(４)の真上に排気合流通路壁(３)を位置させている。ＥＧＲクーラ(４)の真上の位置とは、図３に示すように、シリンダの中心軸線(２６)と平行な向きに見た場合に、ＥＧＲクーラ(４)の上方で、ＥＧＲクーラ(４)と重なる位置をいう。ＥＧＲクーラ(４)は、シリンダの中心軸線(２６)と平行な向きに見た場合に、排気合流通路壁(３)から横にはみ出さないように配置されている。   As illustrated in FIGS. 3 to 5, an EGR cooler (4) is installed in the front-rear direction on the side of the cylinder block (5), and the exhaust merging passage wall (3) is positioned directly above the EGR cooler (4). I am letting. As shown in FIG. 3, the position directly above the EGR cooler (4) is defined above the EGR cooler (4) when viewed in a direction parallel to the central axis (26) of the cylinder. ). The EGR cooler (4) is arranged so as not to protrude laterally from the exhaust merging passage wall (3) when viewed in a direction parallel to the central axis (26) of the cylinder.

図３から図５に示すように、エンジン冷却ファン(６)のある方を前、その反対側を後として、エンジン冷却ファン(６)の後方にＥＧＲクーラ(４)から導出したＥＧＲガス供給パイプ(４１)を配置し、エンジン冷却ファン(６)で起こしたエンジン冷却風がＥＧＲガス供給パイプ(４１)に吹き当たるようにしている。ＥＧＲガス供給パイプ(４１)の下流にＥＧＲ弁ケース(８)を配置している。エンジン冷却ファン(６)の後方にＥＧＲクーラ(４)から導出した冷却水導出管(９)を配置し、エンジン冷却ファン(６)で起こしたエンジン冷却風が冷却水導出管(９)に吹き当たるようにしている。ＥＧＲガス供給パイプ(４１)と冷却水導出管(９)とは、いずれもエンジン冷却ファン(６)の真後に配置している。   As shown in FIGS. 3 to 5, the EGR gas supply pipe led out from the EGR cooler (4) behind the engine cooling fan (6) with the one with the engine cooling fan (6) on the front and the opposite side on the rear (41) is arranged so that the engine cooling air generated by the engine cooling fan (6) blows against the EGR gas supply pipe (41). An EGR valve case (8) is arranged downstream of the EGR gas supply pipe (41). The cooling water outlet pipe (9) led out from the EGR cooler (4) is arranged behind the engine cooling fan (6), and the engine cooling air generated by the engine cooling fan (6) blows to the cooling water outlet pipe (9). I am trying to win. Both the EGR gas supply pipe (41) and the cooling water outlet pipe (9) are arranged immediately behind the engine cooling fan (6).

エンジン冷却ファン(６)の真後とは、図５に示すように、クランク軸の中心軸線(２７)と平行な向きに見た場合に、エンジン冷却ファン(６)の後方で、エンジン冷却ファン(６)と重なる位置をいう。図５に示すように、冷却水導出管(９)の導出端は冷却水ポンプ(１７)の吸い込み側に連通させている。図４に示すように、ＥＧＲクーラ(４)から導出した冷却水導入管(２８)の導出端はシリンダブロック(５)内のシリンダジャケット(図外)に連通させている。   As shown in FIG. 5, the engine cooling fan (6) is located immediately behind the engine cooling fan (6) when viewed in a direction parallel to the center axis (27) of the crankshaft. (6) The position that overlaps. As shown in FIG. 5, the outlet end of the cooling water outlet pipe (9) communicates with the suction side of the cooling water pump (17). As shown in FIG. 4, the leading end of the cooling water introduction pipe (28) led out from the EGR cooler (4) communicates with a cylinder jacket (not shown) in the cylinder block (5).

コモンレール式燃料噴射装置の工夫は、次の通りである。
図３、図６に示すように、吸気分配通路壁(２)の真横にコモンレール(１０)を配置することにより、シリンダヘッド(１)とコモンレール(１０)との間に吸気分配通路壁(２)を位置させている。吸気分配通路壁(２)の真横とは、図４に示すように、シリンダの中心軸線(２６)及びクランク軸の中心軸線(２６)と直交する向きに見た場合に、シリンダヘッド(１)と反対側で吸気分配通路壁(２)と重なる位置をいう。吸気分配通路壁(２)の上部に吸気入口管(１１)を立設し、この吸気入口管(１１)に吸気フランジ部(１２)を設け、コモンレール(１０)の真上に吸気フランジ部(１２)を位置させている。コモンレール(１０)の真上とは、図３に示すように、シリンダの中心軸線(２６)と平行な向きに見た場合に、コモンレール(１０)の上方で、コモンレール(１０)と重なる位置をいう。図６に示すように、吸気フランジ部(１２)には吸気ヒータ(２９)を介して吸気接続管(３０)を取り付けている。この吸気接続管(３０)には、過給機(３１)から導出した吸気パイプ(図外)の導出端を接続する。 The device of the common rail fuel injection device is as follows.
As shown in FIGS. 3 and 6, by arranging the common rail (10) directly beside the intake distribution passage wall (2), the intake distribution passage wall (2) is disposed between the cylinder head (1) and the common rail (10). ) Is located. As shown in FIG. 4, the side of the intake distribution passage wall (2) is the cylinder head (1) when viewed in a direction perpendicular to the center axis (26) of the cylinder and the center axis (26) of the crankshaft. And the position overlapping the intake distribution passage wall (2) on the opposite side. An intake inlet pipe (11) is erected on the upper part of the intake distribution passage wall (2), an intake flange part (12) is provided on the intake inlet pipe (11), and an intake flange part ( 12) is located. As shown in FIG. 3, “directly above the common rail (10)” means a position overlapping the common rail (10) above the common rail (10) when viewed in a direction parallel to the central axis (26) of the cylinder. Say. As shown in FIG. 6, an intake connection pipe (30) is attached to the intake flange portion (12) via an intake heater (29). The intake connection pipe (30) is connected to a lead-out end of an intake pipe (not shown) led out from the supercharger (31).

図３、図６に示すように、吸気分配通路壁(２)の上部にＥＧＲガス入口管(１３)を立設し、このＥＧＲガス入口管(１３)の上方にガスフランジ部(１４)を設け、コモンレール(１０)の真上にガスフランジ部(１４)を位置させている。ＥＧＲガス入口管(１３)にはＥＧＲガス接続管(３２)を取り付け、このＥＧＲガス接続管(３２)の上端部にガスフランジ部(１４)を取り付けている。   As shown in FIGS. 3 and 6, an EGR gas inlet pipe (13) is erected on the upper portion of the intake distribution passage wall (2), and a gas flange portion (14) is provided above the EGR gas inlet pipe (13). The gas flange portion (14) is positioned directly above the common rail (10). An EGR gas connection pipe (32) is attached to the EGR gas inlet pipe (13), and a gas flange part (14) is attached to the upper end of the EGR gas connection pipe (32).

図３、図５、図６に示すように、エンジン冷却ファン(６)の後方にガスフランジ部(１４)を位置させ、このガスフランジ部(１４)にＥＧＲ弁ケース(８)を取り付け、エンジン冷却ファン(６)で起こしたエンジン冷却風がガスフランジ部(１４)に吹き当たるようにしている。ガスフランジ部(１４)の下面を後向きに下り傾斜させ、エンジン冷却風がガスフランジ部(１４)の下面の案内でコモンレール(１０)に吹き当たるようにしている。ガスフランジ部(１４)にＥＧＲ弁ケース(８)を取り付け、このＥＧＲ弁ケース(８)に弁アクチュエータ(１５)を取り付け、燃料サプライポンプ(１６)の真上に弁アクチュエータ(１５)を位置させている。燃料サプライポンプ(１６)の真上とは、シリンダ中心軸線と平行な向きに見た場合に、燃料サプライポンプ(１６)の上方で、燃料サプライポンプ(１６)と重なる位置をいう。   As shown in FIGS. 3, 5, and 6, a gas flange portion (14) is positioned behind the engine cooling fan (6), and an EGR valve case (8) is attached to the gas flange portion (14). The engine cooling air generated by the cooling fan (6) is blown against the gas flange (14). The lower surface of the gas flange portion (14) is inclined downward in a backward direction so that the engine cooling air blows against the common rail (10) by the guide of the lower surface of the gas flange portion (14). An EGR valve case (8) is attached to the gas flange portion (14), a valve actuator (15) is attached to the EGR valve case (8), and the valve actuator (15) is positioned directly above the fuel supply pump (16). ing. The term “directly above the fuel supply pump (16)” means a position overlapping the fuel supply pump (16) above the fuel supply pump (16) when viewed in a direction parallel to the cylinder center axis.

図３、図５、図６に示すように、エンジン前部に冷却水ポンプ(１７)を取り付け、コモンレール(１０)の前方真正面にこの冷却水ポンプ(１７)の入口管部分(１８)を位置させている。入口管部分(１８)にはラジエータから導出した冷却水戻しパイプ(図外)の導出端を接続する。コモンレール(１０)の前方真正面の位置とは、図３に示すように、クランク軸の中心軸線(２７)と平行な向きに見た場合に、コモンレール(１０)の前方で、コモンレール(１０)と重なる位置をいう。   As shown in FIGS. 3, 5, and 6, the cooling water pump (17) is attached to the front of the engine, and the inlet pipe portion (18) of the cooling water pump (17) is positioned directly in front of the common rail (10). I am letting. Connected to the inlet pipe portion (18) is a lead-out end of a cooling water return pipe (not shown) led out from the radiator. As shown in FIG. 3, the position in front of the common rail (10) is the front of the common rail (10) and the common rail (10) when viewed in a direction parallel to the central axis (27) of the crankshaft. The overlapping position.

図３、図５、図６に示すように、シリンダヘッド(１)の真横に燃料フィルタ(１９)を配置し、コモンレール(１０)の真後に燃料フィルタ(１９)を位置させている。シリンダブロック(４)の横壁にオイルフィルタ取付座(２０)を設け、このオイルフィルタ取付座(２０)にオイルフィルタ(２１)を取り付け、コモンレール(１０)の真下にオイルフィルタ取付座(２０)を位置させている。コモンレール(１０)の真後の位置とは、図３に示すように、クランク軸の中心軸線(２７)と平行な向きに見た場合に、コモンレール(１０)の後方でコモンレール(１０)と重なる位置をいう。コモンレール(１０)の真下の位置とは、図３に示すように、シリンダの中心軸線(２６)と平行な向きに見た場合に、コモンレール(１０)の下方で、コモンレール(１０)と重なる位置をいう。   As shown in FIGS. 3, 5, and 6, a fuel filter (19) is disposed directly beside the cylinder head (1), and the fuel filter (19) is positioned just behind the common rail (10). An oil filter mounting seat (20) is provided on the lateral wall of the cylinder block (4), an oil filter (21) is mounted on the oil filter mounting seat (20), and an oil filter mounting seat (20) is mounted directly below the common rail (10). It is located. As shown in FIG. 3, the position immediately behind the common rail (10) overlaps with the common rail (10) behind the common rail (10) when viewed in a direction parallel to the central axis (27) of the crankshaft. Says the position. As shown in FIG. 3, the position directly below the common rail (10) is a position overlapping the common rail (10) below the common rail (10) when viewed in a direction parallel to the central axis (26) of the cylinder. Say.

ＥＧＲガス供給パイプの支持構造は、次の通りである。
図３に示すように、排気側と吸気側とをＥＧＲガス供給パイプ(４１)で結び、ＥＧＲガス供給パイプ(４１)の各端部(４２)(４３)をエンジン部品(４４)(４５)に固定している。ＥＧＲガス供給パイプ(４１)の先端部(４２)を固定しているエンジン部品(４４)はＥＧＲ弁ケース(８)である。ＥＧＲガス供給パイプ(４１)の基端部(４３)を固定しているエンジン部品(４５)はＥＧＲクーラ(４)である。 The support structure of the EGR gas supply pipe is as follows.
As shown in FIG. 3, the exhaust side and the intake side are connected by an EGR gas supply pipe (41), and each end (42) (43) of the EGR gas supply pipe (41) is connected to an engine part (44) (45). It is fixed to. The engine component (44) fixing the tip (42) of the EGR gas supply pipe (41) is an EGR valve case (8). The engine part (45) which fixes the base end part (43) of the EGR gas supply pipe (41) is an EGR cooler (4).

図１(Ａ)に示すように、ＥＧＲガス供給パイプ(４１)の途中部(４１ａ)に支持ステー(４６)を配置し、この支持ステー(４６)を帯状金属板で構成し、図１(Ｂ)に示すように、帯状金属板の基端部(４７)を平に形成し、帯状金属板の中間部(４８)を環状に折り返し、帯状金属板の先端部(４９)を平に形成し、中間部(４８)をＥＧＲガス供給パイプ(４１)の途中部(４１ａ)に外嵌させ、先端部(４９)と基端部(４７)とを重ねて、締結具(５０)でエンジン部品(５１)に締結固定することにより、中間部(４８)でＥＧＲガス供給パイプ(４１)の途中部(４１ａ)を挟み付け、中間部(４８)にＥＧＲガス供給パイプ(４１)の途中部(４１ａ)の周面から離れた非接触部(５２)を形成している。非接触部(５２)に変形の余地があるため、エンジンの振動でＥＧＲガス供給パイプ(４１)の中途部(４１ａ)と支持ステー(４６)にかかる応力は、靭性に基づく非接触部(５２)の変形(ガス供給パイプ(４１)の途中部(４１ａ)の挟み付けが維持される程度の変形)によって緩和され、ＥＧＲガス供給パイプ(４１)と支持ステー(４６)の損傷が抑制される。
支持ステー(４６)を構成する帯状金属板は、ＳＰＣＣ(冷間圧延鋼板)であり、ＥＧＲガス供給パイプ(４１)はステンレス鋼である。
締結具(５０)はボルトナットである。支持ステー(４６)を固定するエンジン部品(５１)はエンジンの吊り上げ用係止板(５５)である。 As shown in FIG. 1 (A), a support stay (46) is arranged in the middle portion (41a) of the EGR gas supply pipe (41), and this support stay (46) is formed of a band-shaped metal plate. As shown in B), the base end portion (47) of the strip-shaped metal plate is formed flat, the middle portion (48) of the strip-shaped metal plate is folded back into an annular shape, and the tip end portion (49) of the strip-shaped metal plate is formed flat. Then, the intermediate part (48) is externally fitted to the middle part (41a) of the EGR gas supply pipe (41), and the front end part (49) and the base end part (47) are overlapped with each other. By fastening and fixing to the component (51), the middle part (41a) of the EGR gas supply pipe (41) is sandwiched by the middle part (48), and the middle part of the EGR gas supply pipe (41) is sandwiched by the middle part (48). A non-contact part (52) separated from the peripheral surface of (41a) is formed. Since there is room for deformation in the non-contact portion (52), the stress applied to the midway portion (41a) and the support stay (46) of the EGR gas supply pipe (41) due to the vibration of the engine is the non-contact portion (52 ) Deformation (deformation to such an extent that pinching of the intermediate portion (41a) of the gas supply pipe (41) is maintained), and damage to the EGR gas supply pipe (41) and the support stay (46) is suppressed. .
The strip metal plate constituting the support stay (46) is SPCC (cold rolled steel plate), and the EGR gas supply pipe (41) is stainless steel.
The fastener (50) is a bolt and nut. An engine component (51) for fixing the support stay (46) is an engine lifting locking plate (55).

図１(Ｂ)に示すように、ＥＧＲガス供給パイプ(４１)の途中部(４１ａ)は断面円形状で、中間部(４８)は円弧部分(５３)と対向部分(５４)とを備え、円弧部分(５３)はＥＧＲガス供給パイプ(４１)の途中部(４１ａ)の周面に沿わせ、対向部分(５４)はＥＧＲガス供給パイプ(４１)の中心軸線(４１ｂ)を間に挟んで円弧部分(５３)と対向させ、ＥＧＲガス供給パイプ(４１)の途中部(４１ａ)を円弧部分(５３)と対向部分(５４)とで挟み付けることにより、支持ステー(４６)をエンジン部品(５１)に取り付ける前に、支持ステー(４６)をＥＧＲガス供給パイプ(４１)の途中部(４１ａ)に摩擦固定できるようにしている。   As shown in FIG. 1 (B), the middle portion (41a) of the EGR gas supply pipe (41) has a circular cross section, and the intermediate portion (48) includes an arc portion (53) and an opposing portion (54). The arc portion (53) runs along the peripheral surface of the middle portion (41a) of the EGR gas supply pipe (41), and the opposed portion (54) sandwiches the central axis (41b) of the EGR gas supply pipe (41). By facing the arc portion (53) and sandwiching the middle portion (41a) of the EGR gas supply pipe (41) between the arc portion (53) and the facing portion (54), the support stay (46) is attached to the engine component ( Before attaching to 51), the support stay (46) can be frictionally fixed to the middle part (41a) of the EGR gas supply pipe (41).

本発明の実施形態に係るエンジンで用いるＥＧＲガス供給パイプと支持ステーとを説明する図で、図１(Ａ)は側面図、図１(Ｂ)は図１(Ａ)のＢ−Ｂ線断面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram for explaining an EGR gas supply pipe and a support stay used in an engine according to an embodiment of the present invention, in which FIG. 1 (A) is a side view, and FIG. FIG. 図１のＥＧＲガス供給パイプと支持ステーとを説明する図で、図２(Ａ)は平面図、図２(Ｂ)は正面図である。FIG. 2A is a plan view and FIG. 2B is a front view illustrating the EGR gas supply pipe and the support stay in FIG. 1. 本発明の実施形態に係るエンジンの平面図である。1 is a plan view of an engine according to an embodiment of the present invention. 図３のエンジンの右側面図である。FIG. 4 is a right side view of the engine of FIG. 3. 図３のエンジンの正面図である。It is a front view of the engine of FIG. 図３のエンジンの左側面図である。It is a left view of the engine of FIG.

符号の説明Explanation of symbols

(４１) ＥＧＲガス供給パイプ
(４１ａ) 途中部
(４１ｂ) 中心軸線
(４２) 端部
(４３) 端部
(４４) エンジン部品
(４５) エンジン部品
(４６) 支持ステー
(４７) 基端部
(４８) 中間部
(４９) 先端部
(５０) 締結具
(５１) エンジン部品
(５２) 非接触部
(５３) 円弧部分
(５４) 対向部分 (41) EGR gas supply pipe
(41a) midway
(41b) Center axis
(42) End
(43) Edge
(44) Engine parts
(45) Engine parts
(46) Support stay
(47) Base end
(48) Middle part
(49) Tip
(50) Fastener
(51) Engine parts
(52) Non-contact part
(53) Arc part
(54) Opposite part

Claims (2)

排気側と吸気側とをＥＧＲガス供給パイプ(４１)で結び、ＥＧＲガス供給パイプ(４１)の各端部(４２)(４３)をエンジン部品(４４)(４５)に固定したエンジンにおいて、
ＥＧＲガス供給パイプ(４１)の途中部(４１ａ)に支持ステー(４６)を配置し、この支持ステー(４６)を帯状金属板で構成し、帯状金属板の基端部(４７)を平に形成し、帯状金属板の中間部(４８)を環状に折り返し、帯状金属板の先端部(４９)を平に形成し、中間部(４８)をＥＧＲガス供給パイプ(４１)の途中部(４１ａ)に外嵌させ、先端部(４９)と基端部(４７)とを重ねて、締結具(５０)でエンジン部品(５１)に締結固定することにより、中間部(４８)でＥＧＲガス供給パイプ(４１)の途中部(４１ａ)を挟み付け、中間部(４８)にＥＧＲガス供給パイプ(４１)の途中部(４１ａ)の周面から離れた非接触部(５２)を形成した、ことを特徴とするエンジン。 In an engine in which the exhaust side and the intake side are connected by an EGR gas supply pipe (41), and the end portions (42) and (43) of the EGR gas supply pipe (41) are fixed to engine parts (44) and (45),
A support stay (46) is arranged in the middle portion (41a) of the EGR gas supply pipe (41), and this support stay (46) is formed of a strip metal plate, and the base end portion (47) of the strip metal plate is flattened. The intermediate portion (48) of the belt-shaped metal plate is annularly folded, the tip portion (49) of the belt-shaped metal plate is formed flat, and the intermediate portion (48) is the middle portion (41a) of the EGR gas supply pipe (41). EGR gas supply at the intermediate portion (48) by fitting the front end portion (49) and the base end portion (47) to each other and fastening them to the engine part (51) with the fastener (50). The intermediate part (41a) of the pipe (41) is sandwiched, and the non-contact part (52) separated from the peripheral surface of the intermediate part (41a) of the EGR gas supply pipe (41) is formed in the intermediate part (48). An engine characterized by 請求項１に記載したエンジンにおいて、
ＥＧＲガス供給パイプ(４１)の途中部(４１ａ)は断面円形状で、中間部(４８)は円弧部分(５３)と対向部分(５４)とを備え、円弧部分(５３)はＥＧＲガス供給パイプ(４１)の途中部(４１ａ)の周面に沿わせ、対向部分(５４)はＥＧＲガス供給パイプ(４１)の中心軸線(４１ｂ)を間に挟んで円弧部分(５３)と対向させ、ＥＧＲガス供給パイプ(４１)の途中部(４１ａ)を円弧部分(５３)と対向部分(５４)とで挟み付けることにより、支持ステー(４６)をエンジン部品(５１)に取り付ける前に、支持ステー(４６)をＥＧＲガス供給パイプ(４１)の途中部(４１ａ)に摩擦固定できるようにした、ことを特徴とするエンジン。 The engine according to claim 1,
The middle portion (41a) of the EGR gas supply pipe (41) has a circular cross section, the intermediate portion (48) includes an arc portion (53) and an opposing portion (54), and the arc portion (53) is an EGR gas supply pipe. Along the circumferential surface of the middle portion (41a) of (41), the facing portion (54) faces the arc portion (53) with the central axis (41b) of the EGR gas supply pipe (41) in between, and EGR Before the support stay (46) is attached to the engine component (51), the middle portion (41a) of the gas supply pipe (41) is sandwiched between the arc portion (53) and the facing portion (54). 46) An engine characterized in that 46) can be frictionally fixed to an intermediate portion (41a) of an EGR gas supply pipe (41).
JP2008078296A 2008-03-25 2008-03-25 Engine Pending JP2009228645A (en)

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WO2018235737A1 (en) * 2017-06-22 2018-12-27 いすゞ自動車株式会社 Exhaust gas recirculating device
JP2019007389A (en) * 2017-06-22 2019-01-17 いすゞ自動車株式会社 Exhaust gas recirculation device
US11047347B2 (en) 2017-06-22 2021-06-29 Isuzu Motors Limited Exhaust gas recirculating device

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