JP4729548B2 - engine - Google Patents
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- JP4729548B2 JP4729548B2 JP2007242589A JP2007242589A JP4729548B2 JP 4729548 B2 JP4729548 B2 JP 4729548B2 JP 2007242589 A JP2007242589 A JP 2007242589A JP 2007242589 A JP2007242589 A JP 2007242589A JP 4729548 B2 JP4729548 B2 JP 4729548B2
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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
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- Y02T10/12—Improving ICE efficiencies
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Description
本発明は、エンジンに関し、詳しくは、過給圧伝達通路を短く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 capable of shortening a supercharging pressure transmission passage.
従来のエンジンとして、本発明と同様、ＥＧＲ弁の駆動にニューマチック式の弁アクチュエータを用い、過給圧伝達通路に感温作動性の過給圧遮断弁を設けたものがある(例えば、特許文献１参照)。
この種のエンジンは、電子制御を用いることなくＥＧＲ弁の制御を行うことができるとともに、冷間始動時にはＥＧＲを停止して始動性を高めることができる利点がある。
しかし、この従来のエンジンでは、シリンダジャケットに過給圧遮断弁ケースの入熱部を臨ませているため、問題がある。
As in the present invention, a conventional engine uses a pneumatic valve actuator for driving an EGR valve and is provided with a temperature-sensitive supercharging pressure cutoff valve in a supercharging pressure transmission passage (for example, a patent) Reference 1).
This type of engine has an advantage that the EGR valve can be controlled without using electronic control, and that the EGR can be stopped and the startability can be improved during a cold start.
However, this conventional engine has a problem because the heat input portion of the supercharging pressure cutoff valve case faces the cylinder jacket.
上記従来技術では、次の問題がある。
《問題》 過給圧伝達通路が長くなる。
シリンダジャケットに過給圧遮断弁ケースの入熱部を臨ませているため、過給圧遮断弁ケースと弁アクチュエータとの間の距離が離れ、過給圧伝達通路が長くなる。
The above prior art has the following problems.
<Problem> The supercharging pressure transmission passage becomes longer.
Since the heat input portion of the supercharging pressure cutoff valve case faces the cylinder jacket, the distance between the supercharging pressure cutoff valve case and the valve actuator is increased, and the supercharging pressure transmission path becomes long.
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、過給圧伝達通路を短く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 capable of solving the above-described problems, that is, an engine capable of shortening a supercharging pressure transmission path.
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、排気エネルギーで駆動される過給機(３０)で吸気通路(３)内に過給を行い、ＥＧＲ弁(９)の駆動にニューマチック式の弁アクチュエータ(８)を用い、この弁アクチュエータ(８)の弁作動圧室(３４)に過給圧伝達通路(２０)を介して吸気通路(３)を連通させ、この吸気通路(３)内の過給圧が高くなるにつれて弁アクチュエータ(８)の弁作動圧室(３４)の弁作動圧が高くなるようにし、弁作動圧室(３４)の弁作動圧が所定値未満となる場合には、閉弁付勢手段(９ｂ)でＥＧＲ弁(９)の閉弁状態を維持し、弁作動圧室(３４)の弁作動圧が所定値以上となる場合には、弁作動圧室(３４)の弁作動圧でＥＧＲ弁(９)を開弁するようにし、
過給圧伝達通路(２０)に感温作動性の過給圧遮断弁(３６)を設け、
エンジン温度が所定値未満の冷間始動時には、吸気通路(３)内の過給圧に拘わらず、過給圧遮断弁(３６)が閉弁して、閉弁付勢手段(９ｂ)でＥＧＲ弁(９)の閉弁状態を維持し、
エンジン温度が所定値以上の温間始動時や通常運転時には、過給圧遮断弁(３６)の開弁により、吸気通路(３)内の過給圧に応じたＥＧＲ弁(９)の開閉を行なうようにした、エンジンにおいて、
図４に示すように、ＥＧＲ弁ケース(７)に弁アクチュエータ(８)と過給圧遮断弁ケース(３６ｃ)とを取り付け、ＥＧＲ弁ケース(７)に弁冷却水路(３１)を設け、この弁冷却水路(３１)に過給圧遮断弁ケース(３６ｃ)の入熱部(３７)を臨ませ、
図２(Ｂ)に示すように、弁冷却水路(３１)の一部をＥＧＲ弁ケース(７)に設けた貫通孔(５５)で構成し、この貫通孔(５５)の一端部(５５ａ)に過給圧遮断弁ケース(３６ｃ)の入熱部(３７)を内嵌させることにより、この貫通孔(５５)の一端部(５５ａ)を封止した、ことを特徴とするエンジン。
Invention specific matters of the invention according to
As illustrated in FIG. 1, a supercharger (30) driven by exhaust energy supercharges the intake passage (3), and a pneumatic valve actuator (8) is used to drive the EGR valve (9). And the intake passage (3) is connected to the valve operating pressure chamber (34) of the valve actuator (8) via the supercharging pressure transmission passage (20), and the supercharging pressure in the intake passage (3) is reduced. The valve operating pressure of the valve operating pressure chamber (34) of the valve actuator (8) is increased as the valve operating pressure is increased. When the valve operating pressure of the valve operating pressure chamber (34) becomes less than a predetermined value, the valve is closed. When the EGR valve (9) is kept closed by the biasing means (9b) and the valve operating pressure in the valve operating pressure chamber (34) exceeds a predetermined value, the valve operation of the valve operating pressure chamber (34) is performed. The EGR valve (9) is opened with pressure,
The supercharging pressure transmission passage (20) is provided with a temperature-sensitive actuated supercharging pressure cutoff valve (36),
During a cold start when the engine temperature is less than a predetermined value, the supercharging pressure shut-off valve (36) is closed regardless of the supercharging pressure in the intake passage (3), and the EGR is operated by the valve closing urging means (9b). Keep the valve (9) closed,
When the engine temperature is higher than a predetermined value or during normal operation, the EGR valve (9) is opened and closed according to the boost pressure in the intake passage (3) by opening the boost pressure shut-off valve (36). In the engine that I did,
As shown in FIG. 4, a valve actuator (8) and a boost pressure cutoff valve case (36c) are attached to the EGR valve case (7), and a valve cooling water passage (31) is provided in the EGR valve case (7). The heat input part (37) of the supercharging pressure cutoff valve case (36c) is exposed to the valve cooling water passage (31),
As shown in FIG. 2 (B), a part of the valve cooling water channel (31) is constituted by a through hole (55) provided in the EGR valve case (7), and one end (55a) of the through hole (55). The engine is characterized in that one end portion (55a) of the through hole (55) is sealed by fitting the heat input portion (37) of the supercharging pressure cutoff valve case (36c) to the inside.
（請求項１に係る発明）
《効果》 過給圧伝達通路を短くすることができる。
図４に例示するように、ＥＧＲ弁ケース(７)に弁アクチュエータ(８)と過給圧遮断弁ケース(３６ｃ)とを取り付け、ＥＧＲ弁ケース(７)に弁冷却水路(３１)を設け、この弁冷却水路(３１)に過給圧遮断弁ケース(３６ｃ)の入熱部(３７)を臨ませたので、弁アクチュエータ(８)と過給圧遮断弁ケース(３６ｃ)との間の距離を近づけ、過給圧伝達通路(２０)を短くすることができる。
(Invention according to Claim 1)
<Effect> The supercharging pressure transmission passage can be shortened.
As illustrated in FIG. 4, a valve actuator (8) and a supercharging pressure cutoff valve case (36c) are attached to the EGR valve case (7), and a valve cooling water channel (31) is provided in the EGR valve case (7). Since the heat input part (37) of the supercharging pressure cutoff valve case (36c) is exposed to the valve cooling water passage (31), the distance between the valve actuator (8) and the supercharging pressure cutoff valve case (36c). And the supercharging pressure transmission path (20) can be shortened.
《効果》 弁冷却水路の形成が容易になる。
図２(Ｂ)に例示するように、弁冷却水路(３１)の一部をＥＧＲ弁ケース(７)に設けた貫通孔(５５)で構成したので、弁冷却水路(３１)の形成が容易になる。
<Effect> Formation of the valve cooling water channel becomes easy.
As illustrated in FIG. 2B, a part of the valve cooling water channel (31) is constituted by the through hole (55) provided in the EGR valve case (7), so that the valve cooling water channel (31) can be easily formed. become.
《効果》 専用の封止栓が不要になる。
図２(Ｂ)に例示するように、貫通孔(５５)の一端部(５５ａ)に過給圧遮断弁ケース(３６ｃ)の入熱部(３７)を内嵌させることにより、この貫通孔(５５)の一端部(５５ａ)を封止したので、専用の封止栓が不要になる。
<Effect> No special sealing plug is required.
As illustrated in FIG. 2 (B), by inserting the heat input part (37) of the supercharging pressure cutoff valve case (36c) into one end part (55a) of the through hole (55), this through hole ( Since the one end portion (55a) of 55) is sealed, a dedicated sealing plug becomes unnecessary.
《効果》 ＥＧＲ弁の開閉制御装置が簡素化される。
図１に例示するように、ＥＧＲ弁(９)の駆動にニューマチック式の弁アクチュエータ(８)を用いるので、ＥＧＲ弁(９)の開閉制御に電子部品を必要とせず、ＥＧＲ弁(９)の開閉制御装置が簡素化される。
<Effect> The EGR valve opening / closing control device is simplified.
As illustrated in FIG. 1, since the pneumatic valve actuator (8) is used to drive the EGR valve (9), electronic components are not required for opening / closing control of the EGR valve (9), and the EGR valve (9) The opening / closing control device is simplified.
《効果》 エンジンの始動性が高まる。
図２(Ａ)に例示するように、エンジン温度が所定値未満の冷間始動時には、吸気通路(３)内の過給圧に拘わらず、過給圧遮断弁(３６)が閉弁して、閉弁付勢手段(９ｂ)でＥＧＲ弁(９)の閉弁状態を維持するので、冷間始動時には吸気にＥＧＲガスが供給されず、エンジンの始動性が高まる。
<Effect> Increases engine startability.
As illustrated in FIG. 2A, at the cold start when the engine temperature is lower than a predetermined value, the supercharging pressure cutoff valve (36) is closed regardless of the supercharging pressure in the intake passage (3). Since the EGR valve (9) is kept closed by the valve closing urging means (9b), the EGR gas is not supplied to the intake air during the cold start, and the engine startability is improved.
（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弁の作動不良を防止することができる。
図２(Ｂ)に例示するように、出口側水路(５８)の中間水路(５７)側の一端部(５５ａ)に過給圧遮断弁ケース(３６ｃ)の入熱部(３７)を内嵌させたので、過給圧遮断弁ケース(３６ｃ)の入熱部(３７)に冷却水の水流が正面衝突せず、過給圧遮断弁(３６)のチャタリングが防止される。このため、ＥＧＲ弁(９)の作動不良を防止することができる。
(Invention according to Claim 2)
In addition to the effect of the invention according to
<Effect> It is possible to prevent malfunction of the EGR valve.
As illustrated in FIG. 2 (B), the heat input portion (37) of the supercharging pressure shut-off valve case (36c) is fitted into one end portion (55a) of the outlet water passage (58) on the intermediate water passage (57) side. As a result, the cooling water flow does not collide with the heat input portion (37) of the supercharging pressure cutoff valve case (36c), and chattering of the supercharging pressure cutoff valve (36) is prevented. For this reason, the malfunction of the EGR valve (9) can be prevented.
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８は本発明の実施形態に係るディーゼルエンジンを説明する図で、この実施形態では、立型水冷式の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. 1 to 8 are diagrams for explaining a diesel engine according to an embodiment of the present invention. In this embodiment, a vertical water-cooled 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５に示すように、シリンダブロック(２６)の上部にシリンダヘッド(２)を組み付け、シリンダブロック(２６)の下部にオイルパン(２７)を組み付け、シリンダブロック(２６)の前部に水ポンプ(３９)とギヤケース(２８)を組み付け、シリンダブロック(２６)の後部にフライホイルハウジング(２９)を組み付けている。
The outline of the embodiment of the present invention is as follows.
As shown in FIG. 5, the cylinder head (2) is assembled to the upper part of the cylinder block (26), the oil pan (27) is assembled to the lower part of the cylinder block (26), and the water pump is attached to the front part of the cylinder block (26). (39) and the gear case (28) are assembled, and a flywheel housing (29) is assembled to the rear part of the cylinder block (26).
ＥＧＲ装置の構成は、次の通りである。
図１に示すように、排気通路(４)をＥＧＲクーラ(６)とＥＧＲ弁ケース(７)と逆止弁ケース(１０)とを介して吸気通路(３)に連通させている。排気通路(４)は排気マニホルドであり、吸気通路(３)は吸気マニホルドである。
The configuration of the EGR device is as follows.
As shown in FIG. 1, the exhaust passage (4) communicates with the intake passage (3) through an EGR cooler (6), an EGR valve case (7), and a check valve case (10). The exhaust passage (4) is an exhaust manifold, and the intake passage (3) is an intake manifold.
冷却装置の構成は、次の通りである。
図１に示すように、オイルクーラ(４９)とＥＧＲクーラ(６)とＥＧＲ弁ケース(７)とを備え、ＥＧＲ弁ケース(７)に弁冷却水路(３１)を形成し、オイルクーラ(４９)の水ジャケットとＥＧＲクーラ(６)の水ジャケットと弁冷却水路(３１)とを直列に接続している。
The configuration of the cooling device is as follows.
As shown in FIG. 1, an oil cooler (49), an EGR cooler (6), and an EGR valve case (7) are provided, a valve cooling water passage (31) is formed in the EGR valve case (7), and an oil cooler (49 ), A water jacket of the EGR cooler (6), and a valve cooling water channel (31) are connected in series.
図１に示すように、ＥＧＲクーラ(６)の水ジャケットと弁冷却水路(３１)とを冷却水中継パイプ(３２)で直列に接続するに当たり、ＥＧＲクーラ(６)とＥＧＲ弁ケース(７)とを隣接して配置している。
オイルクーラ(４９)の水ジャケット、ＥＧＲクーラ(６)の水ジャケット、弁冷却水路(３１)の順に冷却水を通過させるようにしている。
As shown in FIG. 1, when the water jacket of the EGR cooler (6) and the valve cooling water channel (31) are connected in series by the cooling water relay pipe (32), the EGR cooler (6) and the EGR valve case (7) Are arranged adjacent to each other.
The cooling water is allowed to pass through the water jacket of the oil cooler (49), the water jacket of the EGR cooler (6), and the valve cooling water channel (31) in this order.
冷却装置での冷却水の循環は、次の通りである。
図１に示すように、シリンダジャケット(５９)内の冷却水は、オイルクーラ(４９)の水ジャケット、ＥＧＲクーラ(６)の水ジャケット、弁冷却水路(３１)、シリンダジャケット(５９)内の吸引水路(６０)、水ポンプ(３９)を順に通過して、シリンダジャケット(５９)に戻る。図５に示すように、シリンダジャケット(５９)のシリンダジャケット出口(４１)に冷却水出口パイプ(４２)を介してオイルクーラ(５９)の水ジャケットを連通させ、これに第１の冷却水中継パイプ(４３)を介してＥＧＲクーラ(６)の水ジャケットを連通させ、これに第２の冷却水中継パイプ(３２)を弁冷却水路(３１)に連通させ、これを冷却水入口パイプ(４０)を介してシリンダジャケット(５９)のシリンダジャケット入口(４０ａ)に連通させ、これを吸引水路(６０)を介して水ポンプ(３９)に連通させている。
The circulation of the cooling water in the cooling device is as follows.
As shown in FIG. 1, the cooling water in the cylinder jacket (59) is divided into a water jacket for the oil cooler (49), a water jacket for the EGR cooler (6), a valve cooling water channel (31), and a cylinder jacket (59). It passes through the suction water channel (60) and the water pump (39) in this order, and returns to the cylinder jacket (59). As shown in FIG. 5, the water jacket of the oil cooler (59) is communicated with the cylinder jacket outlet (41) of the cylinder jacket (59) via the cooling water outlet pipe (42), and the first cooling water relay is connected thereto. The water jacket of the EGR cooler (6) is communicated with the pipe (43), the second cooling water relay pipe (32) is communicated with the valve cooling water channel (31), and this is connected to the cooling water inlet pipe (40 ) Is communicated with the cylinder jacket inlet (40a) of the cylinder jacket (59), and is communicated with the water pump (39) via the suction water channel (60).
ＥＧＲ装置の構成は、次の通りである。
図１に示すように、排気エネルギーで駆動される過給機(３０)で吸気通路(３)内に過給を行い、ＥＧＲ弁(９)の駆動にニューマチック式の弁アクチュエータ(８)を用い、この弁アクチュエータ(８)の弁作動圧室(３４)に過給圧伝達通路(２０)を介して吸気通路(３)を連通させ、この吸気通路(３)内の過給圧が高くなるにつれて弁アクチュエータ(８)の弁作動圧室(３４)の弁作動圧が高くなるようにし、弁作動圧室(３４)の弁作動圧が所定値未満となる場合には、閉弁付勢手段(９ｂ)でＥＧＲ弁(９)の閉弁状態を維持し、弁作動圧室(３４)の弁作動圧が所定値以上となる場合には、弁作動圧室(３４)の弁作動圧でＥＧＲ弁(９)を開弁するようにしている。過給圧伝達通路(２０)の通路入口(２０ａ)を吸気通路(３)へのＥＧＲガス入口部(５ａ)よりも吸気上流側に設けている。なお、図１中の符号(４５)はエアクリーナ、(４６)は燃焼室、(４７)は排気マフラである。
The configuration of the EGR device is as follows.
As shown in FIG. 1, a supercharger (30) driven by exhaust energy supercharges the intake passage (3), and a pneumatic valve actuator (8) is used to drive the EGR valve (9). The intake passage (3) is communicated with the valve operating pressure chamber (34) of the valve actuator (8) via the supercharging pressure transmission passage (20), and the supercharging pressure in the intake passage (3) is high. As the valve operating pressure is increased, the valve operating pressure of the valve operating pressure chamber (34) of the valve actuator (8) is increased, and when the valve operating pressure of the valve operating pressure chamber (34) becomes less than a predetermined value, the valve closing bias is applied. When the means (9b) maintains the closed state of the EGR valve (9) and the valve operating pressure in the valve operating pressure chamber (34) exceeds a predetermined value, the valve operating pressure in the valve operating pressure chamber (34) Thus, the EGR valve (9) is opened. The passage inlet (20a) of the supercharging pressure transmission passage (20) is provided on the intake upstream side of the EGR gas inlet (5a) to the intake passage (3). In FIG. 1, reference numeral (45) is an air cleaner, (46) is a combustion chamber, and (47) is an exhaust muffler.
冷始動性を高める工夫は、次の通りである。
図１に示すように、過給圧伝達通路(２０)に感温作動性の過給圧遮断弁(３６)を設け、エンジン温度が所定値未満の冷間始動時には、吸気通路(３)内の過給圧に拘わらず、過給圧遮断弁(３６)が閉弁して、閉弁付勢手段(９ｂ)でＥＧＲ弁(９)の閉弁状態を維持し、エンジン温度が所定値以上の温間始動時や通常運転時には、過給圧遮断弁(３６)の開弁により、吸気通路(３)内の過給圧に応じたＥＧＲ弁(９)の開閉を行なうようにしている。図２(Ａ)に示すように、吸気圧遮断弁(３６)は、吸気圧遮断弁ケース(３６ｃ)の内部にバイメタル製の感温性変形手段(３６ａ)を備え、その温度による変形で弁体(３６ｂ)の開弁圧を変更する。
The ideas for improving the cold startability are as follows.
As shown in FIG. 1, a supercharging pressure shut-off valve (36) that is temperature-sensitive and operable is provided in the supercharging pressure transmission passage (20), and during cold start when the engine temperature is less than a predetermined value, Regardless of the supercharging pressure, the supercharging pressure shut-off valve (36) is closed and the EGR valve (9) is kept closed by the valve closing urging means (9b), so that the engine temperature exceeds a predetermined value. During warm start of the engine and during normal operation, the EGR valve (9) is opened and closed in accordance with the supercharging pressure in the intake passage (3) by opening the supercharging pressure cutoff valve (36). As shown in FIG. 2 (A), the intake pressure shut-off valve (36) is provided with bimetal temperature-sensitive deformation means (36a) inside the intake pressure shut-off valve case (36c), and the valve is deformed by its temperature. The valve opening pressure of the body (36b) is changed.
図２(Ａ)(Ｂ)に示すように、ＥＧＲ弁ケース(７)に弁アクチュエータ(８)と過給圧遮断弁ケース(３６ｃ)とを取り付け、ＥＧＲ弁ケース(７)に弁冷却水路(３１)を設け、この弁冷却水路(３１)に過給圧遮断弁ケース(３６ｃ)の入熱部(３７)を臨ませている。 2A and 2B, a valve actuator (8) and a supercharging pressure cutoff valve case (36c) are attached to the EGR valve case (7), and a valve cooling water channel ( 31), and the heat input portion (37) of the supercharging pressure cutoff valve case (36c) faces the valve cooling water passage (31).
弁冷却水路の工夫は、次の通りである。
図２(Ｂ)に示すように、弁冷却水路(３１)の一部をＥＧＲ弁ケース(７)に設けた貫通孔(５５)で構成し、この貫通孔(５５)の一端部(５５ａ)に過給圧遮断弁ケース(３６ｃ)の入熱部(３７)を内嵌させることにより、この貫通孔(５５)の一端部(５５ａ)を封止している。
The idea of the valve cooling water channel is as follows.
As shown in FIG. 2 (B), a part of the valve cooling water channel (31) is constituted by a through hole (55) provided in the EGR valve case (7), and one end (55a) of the through hole (55). The heat input part (37) of the supercharging pressure cutoff valve case (36c) is fitted into the end part (55a) of the through hole (55) to be sealed.
図２(Ｂ)に示すように、弁冷却水路(３１)をいずれも真っ直ぐな入口側水路(５６)と中間水路(５７)と出口側水路(５８)とでコの字形に形成するに当たり、上記貫通孔(５５)で出口側水路(５８)を形成し、この出口側水路(５８)の中間水路(５７)側の一端部(５５ａ)に過給圧遮断弁ケース(３６ｃ)の入熱部(３７)を内嵌させている。入口側水路(５６)は中間水路(５７)側の奥が行き止まりの孔で形成した後、奥壁にキリ孔をあけ、ここにエア抜き管(６１)を内嵌している。このエア抜き管(６１)にはパイプを接続して、シリンダジャケットに接続する。中間水路(５７)は出口側水路(５８)側の奥が行き止まりの孔で形成し、入口側水路(５６)側をプラグ(６２)で封止している。 As shown in FIG. 2 (B), the valve cooling water channel (31) is formed into a U-shape with straight inlet side water channel (56), intermediate water channel (57) and outlet side water channel (58). An outlet side water channel (58) is formed by the through hole (55), and heat input to the supercharging pressure cutoff valve case (36c) is provided at one end (55a) of the outlet side water channel (58) on the intermediate water channel (57) side. The part (37) is fitted inside. The inlet side water channel (56) is formed with a dead end on the back side of the intermediate water channel (57), and then a drill hole is made in the rear wall, and an air vent pipe (61) is fitted therein. A pipe is connected to the air vent pipe (61) and connected to the cylinder jacket. The intermediate water channel (57) is formed with a hole having a dead end on the outlet side water channel (58) side, and the inlet side water channel (56) side is sealed with a plug (62).
各部品の配置は、次の通りである。
図３に示すように、ＥＧＲクーラ(６)とＥＧＲ弁ケース(７)とを吸気通路(３)の壁に沿って配置している。
図３、図４に示すように、クランク軸(１)の架設方向を前後方向、この前後方向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)の横一側面に吸気通路(３)の通路壁を取り付け、シリンダヘッド(２)の横他側方に排気通路(４)の通路壁を取り付けるに当たり、吸気通路(３)の通路壁の上部に吸気入口管(５)を立設し、吸気通路(３)の通路壁の上方でＥＧＲクーラ(６)を前後方向に架設し、吸気入口管(５)とＥＧＲクーラ(６)とを前後に並べて配置している。ＥＧＲクーラ(６)は、吸気通路(３)の通路壁の真上、すなわち、図４に示すように、シリンダ中心軸線(２５)と平行な向きに見た場合に、吸気通路(３)の通路壁の上方で、吸気通路(３)の通路壁と重なる位置に配置している。ＥＧＲクーラ(６)は、シリンダ中心軸線(２５)と平行な向きに見た場合に、吸気通路(３)の通路壁よりも横外(シリンダヘッドから離れる側)にはみ出さないように配置している。ＥＧＲクーラ(６)には、シリンダブロック(２６)内の水冷ジャケットから冷却水を導入し、冷却水ポンプ(図外)に冷却水を導出する。
The arrangement of each component is as follows.
As shown in FIG. 3, the EGR cooler (6) and the EGR valve case (7) are arranged along the wall of the intake passage (3).
As shown in FIGS. 3 and 4, the horizontal direction of the cylinder head (2) is defined with the installation direction of the crankshaft (1) as the front-rear direction and the width direction of the cylinder head (2) perpendicular to the front-rear direction as the horizontal direction. When the passage wall of the intake passage (3) is attached and the passage wall of the exhaust passage (4) is attached to the other lateral side of the cylinder head (2), an intake inlet pipe ( 5) is erected, the EGR cooler (6) is installed in the front-rear direction above the passage wall of the intake passage (3), and the intake inlet pipe (5) and the EGR cooler (6) are arranged side by side. Yes. The EGR cooler (6) is located directly above the passage wall of the intake passage (3), that is, when viewed in a direction parallel to the cylinder center axis (25) as shown in FIG. Above the passage wall, it is arranged at a position overlapping the passage wall of the intake passage (3). The EGR cooler (6) is arranged so that it does not protrude laterally outside the passage wall of the intake passage (3) when viewed in a direction parallel to the cylinder center axis (25). ing. Cooling water is introduced into the EGR cooler (6) from a water cooling jacket in the cylinder block (26), and the cooling water is led out to a cooling water pump (not shown).
図３に示すように、吸気通路(３)の通路壁の上方にＥＧＲ弁ケース(７)を配置し、吸気入口管(５)とＥＧＲ弁ケース(７)とＥＧＲクーラ(６)とを前後に並べて配置し、ＥＧＲクーラ(６)の下流にＥＧＲ弁ケース(７)を位置させ、ＥＧＲ弁ケース(７)に弁アクチュエータ(８)を取り付けている。ＥＧＲ弁ケース(７)は、吸気通路(３)の通路壁の真上、すなわち、図４に示すように、シリンダ中心軸線(２５)と平行な向きに見た場合に、吸気通路(３)の通路壁の上方で、吸気通路(３)の通路壁と重なる位置に配置している。図３に示すように、ポペット弁製のＥＧＲ弁(９)の弁軸(９ａ)を垂直にしてＥＧＲ弁ケース(７)内の弁軸挿通孔(７ｃ)内のガスシール(３８)に摺動自在に内嵌させている。ＥＧＲガスは、図３に矢印で示すように、ＥＧＲ弁ケース(７)内を通過し、ガスシール(３８)はＥＧＲ弁(９)の弁口(４４)よりも下流側にある。 As shown in FIG. 3, the EGR valve case (7) is arranged above the passage wall of the intake passage (3), and the intake inlet pipe (5), the EGR valve case (7), and the EGR cooler (6) are moved back and forth. The EGR valve case (7) is positioned downstream of the EGR cooler (6), and the valve actuator (8) is attached to the EGR valve case (7). When the EGR valve case (7) is viewed directly above the passage wall of the intake passage (3), that is, in a direction parallel to the cylinder center axis (25) as shown in FIG. 4, the intake passage (3) Above the passage wall and at a position overlapping the passage wall of the intake passage (3). As shown in FIG. 3, the valve shaft (9a) of the EGR valve (9) made by a poppet valve is made vertical, and is slid onto the gas seal (38) in the valve shaft insertion hole (7c) in the EGR valve case (7). It is fitted in freely. As indicated by arrows in FIG. 3, the EGR gas passes through the EGR valve case (7), and the gas seal (38) is located downstream of the valve port (44) of the EGR valve (9).
図３、図４に示すように、ＥＧＲ弁ケース(７)と吸気入口管(５)との間に逆止弁ケース(１０)を配置し、この逆止弁ケース(１０)内の逆止弁(１０ｃ)で吸気入口管(５)からＥＧＲ弁ケース(７)への吸気の流入とＥＧＲガスの逆流とを阻止することができるようにしている。シリンダヘッド(２)に水冷ジャケット内を通過するヘッド内ＥＧＲ通路(１１)を設け、このヘッド内ＥＧＲ通路(１１)の下流にＥＧＲクーラ(６)を配置している。 As shown in FIGS. 3 and 4, a check valve case (10) is arranged between the EGR valve case (7) and the intake inlet pipe (5), and the check valve in the check valve case (10) is arranged. The valve (10c) can prevent the inflow of intake air from the intake inlet pipe (5) to the EGR valve case (7) and the backflow of EGR gas. An in-head EGR passage (11) passing through the water-cooling jacket is provided in the cylinder head (2), and an EGR cooler (6) is disposed downstream of the in-head EGR passage (11).
図５に示すように、前後方向のうち、エンジン冷却ファン(１４)を配置した方を前、その反対側を後として、後から前に向かって順に、吸気入口管(５)とＥＧＲ弁ケース(７)とＥＧＲクーラ(６)と接続管(１２)とを配置している。図３、図４に示すように、吸気入口管(５)の周壁前部のＥＧＲガス入口部(５ａ)にＥＧＲ弁ケース(７)の後部のＥＧＲ弁ケース出口部(７ａ)を連通させ、ＥＧＲ弁ケース(７)の前部のＥＧＲ弁ケース入口部(７ｂ)にＥＧＲクーラ(６)の後端のクーラ出口部(６ａ)を取り付けてこれらを連通させ、ＥＧＲクーラ(６)の前端のクーラ入口部(６ｂ)に接続管(１２)の後面上部の接続管出口部(１２ａ)を取り付けてこれらを連通させ、接続管(１２)の横面下部の接続管入口部(１２ｂ)をシリンダヘッド(２)の横面前部のヘッド内ＥＧＲ通路出口部(１１ａ)に取り付けてこれらを連通させている。 As shown in FIG. 5, the intake inlet pipe (5) and the EGR valve case are arranged in order from the rear to the front, with the front side being the front side of the engine cooling fan (14) and the rear side being the rear side. (7), EGR cooler (6) and connecting pipe (12) are arranged. As shown in FIGS. 3 and 4, the EGR valve inlet (5a) at the front of the peripheral wall of the intake inlet pipe (5) is connected to the EGR valve case outlet (7a) at the rear of the EGR valve case (7). A cooler outlet (6a) at the rear end of the EGR cooler (6) is attached to the EGR valve case inlet (7b) at the front of the EGR valve case (7) so as to communicate with each other, and the front end of the EGR cooler (6) is connected. A connection pipe outlet part (12a) at the upper rear surface of the connection pipe (12) is attached to the cooler inlet part (6b) so as to communicate with each other, and the connection pipe inlet part (12b) at the lower side of the connection pipe (12) is connected to the cylinder. The head (2) is attached to the in-head EGR passage outlet (11a) at the front of the lateral surface of the head (2) to communicate these.
ＥＧＲ弁ケース(７)とＥＧＲクーラ(６)と接続管(１２)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。また、逆止弁ケース(１０)も剛性連結体の構成要素とし、ＥＧＲ弁ケース(７)の後部のＥＧＲ弁ケース出口部(７ａ)に逆止弁ケース(１０)の前部の逆止弁ケース入口部(１０ｂ)を取り付けてこれらを連通させ、逆止弁ケース(１０)の後面の逆止弁ケース出口部(１０ａ)を吸気入口管(５)の周壁前部のＥＧＲガス入口部(５ａ)に取り付けてこれらを連通させ、逆止弁ケース(１０)内の逆止弁(１０ｃ)で吸気入口管(５)からＥＧＲ弁ケース(７)への吸気の流入とＥＧＲガスの逆流とを阻止することができるようにしている。 The EGR valve case (7), the EGR cooler (6), and the connecting pipe (12) are components of the rigid coupling body, and these components constitute a rigid coupling body that is not flexible. The check valve case (10) is also a component of the rigid connector, and the EGR valve case outlet (7a) at the rear of the EGR valve case (7) is connected to the check valve at the front of the check valve case (10). A case inlet part (10b) is attached to communicate these, and the check valve case outlet part (10a) on the rear surface of the check valve case (10) is connected to the EGR gas inlet part (front part of the peripheral wall of the intake inlet pipe (5)). 5a) are connected to each other, and the check valve (10c) in the check valve case (10) allows the intake air flow from the intake inlet pipe (5) to the EGR valve case (7) and the back flow of EGR gas. To be able to prevent.
図３、図４に示すように、吸気分配通路壁(３)内からシリンダヘッド(２)外を通過するヘッド外ＥＧＲ通路(１３)を導出し、このヘッド外ＥＧＲ通路(１３)の下流にＥＧＲクーラ(６)を配置し、ＥＧＲクーラ(６)にヘッド内ＥＧＲ通路(１１)とヘッド外ＥＧＲ通路(１３)の両方からＥＧＲガスを導入するようにしている。 As shown in FIGS. 3 and 4, an outside-head EGR passage (13) passing outside the cylinder head (2) is led out from the intake distribution passage wall (3), and downstream of the outside-head EGR passage (13). An EGR cooler (6) is arranged, and EGR gas is introduced into the EGR cooler (6) from both the in-head EGR passage (11) and the out-head EGR passage (13).
図５〜図７に示すように、エンジン冷却ファン(１４)の後方にヘッド外ＥＧＲ通路(１３)を配置し、このヘッド外ＥＧＲ通路(１３)にエンジン冷却ファン(１４)で起こしたエンジン冷却風が吹き当たるようにしている。図７に示すように、クランク軸(１)の架設方向と平行な向きに見た場合に、ヘッド外ＥＧＲ通路(１３)はエンジン冷却ファン(１４)と重なる位置よりも僅かにずれているが、エンジン冷却風の吹き当たり領域は、エンジン冷却ファン(１４)の外周の軌跡よりも拡がるため、エンジン冷却風はヘッド外ＥＧＲ通路(１３)に吹き当たる。 As shown in FIGS. 5 to 7, an outside-head EGR passage (13) is arranged behind the engine cooling fan (14), and the engine cooling caused by the engine cooling fan (14) in the outside-head EGR passage (13). The wind blows. As shown in FIG. 7, when viewed in a direction parallel to the installation direction of the crankshaft (1), the EGR passage outside the head (13) is slightly displaced from the position overlapping the engine cooling fan (14). Since the engine cooling air blowing area is larger than the locus of the outer periphery of the engine cooling fan (14), the engine cooling air blows against the head outside EGR passage (13).
図８に示すように、吸気入口管(５)の周壁前部に横長のＥＧＲガス入口部(５ａ)を設け、このＥＧＲガス入口部(５ａ)に左右一対のキリ孔のＥＧＲガス入口(５ｂ)(５ｃ)をあけ、吸気入口管(５)の中心軸線(１６)と平行な向きに見た場合に、吸気入口管(５)の中心軸線(１６)を通過する前後方向仮想線(１７)の左右に、各ＥＧＲガス入口(５ｂ)(５ｃ)の中心線(２５ｂ)(２５ｃ)を位置させ、シリンダヘッド(２)から遠い外寄りのＥＧＲガス入口(５ｂ)の中心線(２５ｂ)がシリンダヘッド(２)に近い内寄りのＥＧＲガス入口(５ｃ)の中心線(２５ｃ)よりも、前後方向仮想線(１７)から遠ざかるようにし、吸気入口管(５)に接続する吸気供給パイプ(１８)をシリンダヘッド(２)側から吸気入口管(５)に近づけている。図５〜図７に示すように、吸気供給パイプ(１８)は、排気通路(４)の通路壁の上部に取り付けた過給機(３０)から導出している。 As shown in FIG. 8, a horizontally long EGR gas inlet (5a) is provided at the front of the peripheral wall of the intake inlet pipe (5), and an EGR gas inlet (5b) of a pair of left and right drill holes is provided in the EGR gas inlet (5a). ) (5c), and when viewed in a direction parallel to the central axis (16) of the intake inlet pipe (5), the front-rear imaginary line (17) passes through the central axis (16) of the intake inlet pipe (5). The center lines (25b) and (25c) of the respective EGR gas inlets (5b) and (5c) are positioned on the left and right of the cylinder), and the center line (25b) of the outer EGR gas inlet (5b) far from the cylinder head (2). The intake supply pipe connected to the intake inlet pipe (5) so that the distance from the virtual line (17) in the front-rear direction is farther from the center line (25c) of the inward EGR gas inlet (5c) near the cylinder head (2) (18) is brought close to the intake inlet pipe (5) from the cylinder head (2) side. As shown in FIGS. 5 to 7, the intake air supply pipe (18) is led out from a supercharger (30) attached to the upper part of the passage wall of the exhaust passage (4).
(３) 吸気通路
(７) ＥＧＲ弁ケース
(８) 弁アクチュエータ
(９) ＥＧＲ弁
(９ｂ) 閉弁付勢手段
(２０) 過給圧伝達通路
(３０) 過給機
(３１) 弁冷却水路
(３２) 冷却水中継パイプ
(３４)弁作動圧室
(３６)過給圧遮断弁
(３６ｃ) 過給圧遮断弁ケース
(３７) 入熱部
(５５) 貫通孔
(５５ａ) 一端部
(５６) 入口側水路
(５７) 中間水路
(５８) 出口側水路
(3) Intake passage
(7) EGR valve case
(8) Valve actuator
(9) EGR valve
(9b) Energizing means for closing the valve
(20) Supercharging pressure transmission passage
(30) Turbocharger
(31) Valve cooling water channel
(32) Cooling water relay pipe
(34) Valve operating pressure chamber
(36) Supercharging pressure cutoff valve
(36c) Boost pressure cutoff valve case
(37) Heat input section
(55) Through hole
(55a) One end
(56) Inlet waterway
(57) Intermediate waterway
(58) Exit waterway
Claims (2)
過給圧伝達通路(２０)に感温作動性の過給圧遮断弁(３６)を設け、
エンジン温度が所定値未満の冷間始動時には、吸気通路(３)内の過給圧に拘わらず、過給圧遮断弁(３６)が閉弁して、閉弁付勢手段(９ｂ)でＥＧＲ弁(９)の閉弁状態を維持し、
エンジン温度が所定値以上の温間始動時や通常運転時には、過給圧遮断弁(３６)の開弁により、吸気通路(３)内の過給圧に応じたＥＧＲ弁(９)の開閉を行なうようにした、エンジンにおいて、
ＥＧＲ弁ケース(７)に弁アクチュエータ(８)と過給圧遮断弁ケース(３６ｃ)とを取り付け、ＥＧＲ弁ケース(７)に弁冷却水路(３１)を設け、この弁冷却水路(３１)に過給圧遮断弁ケース(３６ｃ)の入熱部(３７)を臨ませ、
弁冷却水路(３１)の一部をＥＧＲ弁ケース(７)に設けた貫通孔(５５)で構成し、この貫通孔(５５)の一端部(５５ａ)に過給圧遮断弁ケース(３６ｃ)の入熱部(３７)を内嵌させることにより、この貫通孔(５５)の一端部(５５ａ)を封止した、ことを特徴とするエンジン。 A supercharger (30) driven by exhaust energy supercharges the intake passage (3), and a pneumatic valve actuator (8) is used to drive the EGR valve (9). ) Is connected to the valve operating pressure chamber (34) via the supercharging pressure transmission passage (20), and the valve actuator (8) is increased as the supercharging pressure in the intake passage (3) increases. When the valve operating pressure of the valve operating pressure chamber (34) becomes higher and the valve operating pressure of the valve operating pressure chamber (34) becomes less than a predetermined value, the EGR valve is operated by the valve closing biasing means (9b). When the valve operating state of (9) is maintained and the valve operating pressure of the valve operating pressure chamber (34) is equal to or higher than a predetermined value, the EGR valve (9) is turned on by the valve operating pressure of the valve operating pressure chamber (34). Let it open,
The supercharging pressure transmission passage (20) is provided with a temperature-sensitive actuated supercharging pressure cutoff valve (36),
During a cold start when the engine temperature is less than a predetermined value, the supercharging pressure shut-off valve (36) is closed regardless of the supercharging pressure in the intake passage (3), and the EGR is operated by the valve closing urging means (9b). Keep the valve (9) closed,
When the engine temperature is higher than a predetermined value or during normal operation, the EGR valve (9) is opened and closed according to the boost pressure in the intake passage (3) by opening the boost pressure shut-off valve (36). In the engine that I did,
A valve actuator (8) and a supercharging pressure cutoff valve case (36c) are attached to the EGR valve case (7), a valve cooling water passage (31) is provided in the EGR valve case (7), and the valve cooling water passage (31) is provided. Face the heat input part (37) of the supercharging pressure shut-off valve case (36c)
A part of the valve cooling water passage (31) is constituted by a through hole (55) provided in the EGR valve case (7), and a supercharging pressure cutoff valve case (36c) is provided at one end (55a) of the through hole (55). An engine characterized by sealing one end portion (55a) of the through hole (55) by internally fitting the heat input portion (37).
弁冷却水路(３１)をいずれも真っ直ぐな入口側水路(５６)と中間水路(５７)と出口側水路(５８)とでコの字形に形成するに当たり、上記貫通孔(５５)で出口側水路(５８)を形成し、この出口側水路(５８)の中間水路(５７)側の一端部(５５ａ)に過給圧遮断弁ケース(３６ｃ)の入熱部(３７)を内嵌させた、ことを特徴とするエンジン。 The engine according to claim 1,
When the valve cooling water channel (31) is formed into a U-shape by the straight inlet water channel (56), the intermediate water channel (57), and the outlet water channel (58), the outlet water channel is formed by the through hole (55). (58) was formed, and the heat input portion (37) of the supercharging pressure cutoff valve case (36c) was fitted into one end (55a) of the outlet side water passage (58) on the intermediate water passage (57) side. An engine characterized by that.
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