JP5202140B2 - Exhaust heat insulation cooling system - Google Patents

Exhaust heat insulation cooling system Download PDF

Info

Publication number
JP5202140B2
JP5202140B2 JP2008176211A JP2008176211A JP5202140B2 JP 5202140 B2 JP5202140 B2 JP 5202140B2 JP 2008176211 A JP2008176211 A JP 2008176211A JP 2008176211 A JP2008176211 A JP 2008176211A JP 5202140 B2 JP5202140 B2 JP 5202140B2
Authority
JP
Japan
Prior art keywords
exhaust
heat shield
shield plate
collecting pipe
exhaust gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2008176211A
Other languages
Japanese (ja)
Other versions
JP2010014069A (en
Inventor
修二 永田
日出夫 山路
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daihatsu Motor Co Ltd
Toyota Motor Corp
Original Assignee
Daihatsu Motor Co Ltd
Toyota Motor Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daihatsu Motor Co Ltd, Toyota Motor Corp filed Critical Daihatsu Motor Co Ltd
Priority to JP2008176211A priority Critical patent/JP5202140B2/en
Publication of JP2010014069A publication Critical patent/JP2010014069A/en
Application granted granted Critical
Publication of JP5202140B2 publication Critical patent/JP5202140B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Landscapes

  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)

Description

本発明は、排気系の遮熱冷却装置に関し、特に排気集合管を遮熱するとともに冷却しかつ排気浄化装置の不要な冷却を防止する排気系の遮熱冷却装置に関するものである。   The present invention relates to an exhaust system thermal insulation cooling device, and more particularly, to an exhaust system thermal insulation cooling device that shields and cools an exhaust collecting pipe and prevents unnecessary cooling of an exhaust purification device.

従来、内燃機関の排気集合管の周辺に配設される機器や配線や配管などがその熱影響を受けて損傷するのを防止するため、排気集合管を覆うように遮熱板を配設し、遮熱板と排気集合管の間の隙間に走行風を導入して冷却するようにしたものは知られている(例えば、特許文献1、特許文献2参照)。   Conventionally, in order to prevent equipment, wiring, piping, etc., which are disposed around the exhaust collecting pipe of an internal combustion engine from being damaged by the heat, a heat shield has been provided to cover the exhaust collecting pipe. In addition, it is known that running air is introduced into a gap between the heat shield plate and the exhaust collecting pipe and cooled (see, for example, Patent Document 1 and Patent Document 2).

また、排気ガスを浄化処理する触媒コンバータにおいて、走行風が当たる前面に遮熱板を配設するとともに、触媒コンバータの溶接の始終端に走行風が吹き付けられるように遮熱板に通風孔を形成して亀裂発生の低減を図ったものが知られている(例えば、特許文献3参照)。   In addition, in a catalytic converter that purifies exhaust gas, a heat shield plate is disposed on the front surface where the traveling wind hits, and a ventilation hole is formed in the heat shield plate so that the traveling wind is blown to the start and end of the catalytic converter welding. In order to reduce the occurrence of cracks, it is known (see, for example, Patent Document 3).

また、触媒ケースの周囲を取り囲むようにリアインシュレータとフロントインシュレータを配設し、その間に走行風を導入して冷却するようにするとともに、空気導入口の開口を工夫することによってフロント側とリア側の温度差をなくして熱応力の発生を抑制し、耐久性の向上を図ったものも知られている(例えば、特許文献4参照)。   In addition, a rear insulator and a front insulator are disposed so as to surround the catalyst case, and a running wind is introduced between them to cool the front and rear sides by devising an opening of an air inlet. There is also known one that eliminates the temperature difference and suppresses the generation of thermal stress to improve durability (for example, see Patent Document 4).

また、図5に示すように、排気集合管21の高温部の上部を隙間をあけて覆うように第1の遮熱板23を配設し、排気集合管21の下部に接続された排気ガス浄化装置22の一側方を覆うように第2の遮熱板24を配設するとともに排気ガス浄化装置22の他側に導風板25を配設して、図5に白抜き矢印26で示すように走行風を導風板25で受けて第1の遮熱板23と排気集合管21の間の隙間に導き、排気集合管21の高温部をより効果的に冷却するようにしたものが知られている。
特開平5−16678号公報 特開平8−93470号公報 特開2000−130158号公報 特開2001−152843号公報
In addition, as shown in FIG. 5, an exhaust gas connected to the lower part of the exhaust collecting pipe 21 is provided with a first heat shield plate 23 so as to cover the upper part of the high temperature part of the exhaust collecting pipe 21 with a gap. A second heat shield plate 24 is disposed so as to cover one side of the purification device 22, and an air guide plate 25 is disposed on the other side of the exhaust gas purification device 22. As shown in the figure, the traveling wind is received by the baffle plate 25 and led to the gap between the first heat shield plate 23 and the exhaust collecting pipe 21 to cool the high temperature portion of the exhaust collecting pipe 21 more effectively. It has been known.
Japanese Patent Laid-Open No. 5-16678 JP-A-8-93470 JP 2000-130158 A JP 2001-152843 A

ところが、上記特許文献1、2に記載された構成では、排気集合管と遮熱板との間に走行風を導入するのに、大掛かりな構成を必要としたり、走行風を効率的に導入することができなかったりし、シンプルで安価な構成にて十分な冷却効果を発揮することができず、排気集合管を高温に耐え得る高価な部材にて構成する必要があり、排気集合管又は走行風導入構成のコスト低下を図ることができないという問題がある。   However, in the configurations described in Patent Documents 1 and 2, a large-scale configuration is required to introduce the traveling wind between the exhaust collecting pipe and the heat shield plate, or the traveling wind is efficiently introduced. It is not possible to achieve a sufficient cooling effect with a simple and inexpensive configuration, and it is necessary to configure the exhaust collecting pipe with an expensive member that can withstand high temperatures. There exists a problem that the cost reduction of a wind introduction structure cannot be aimed at.

また、特許文献3、4には、排気ガス浄化装置の前面又は周囲を遮熱板で覆うことで、所定の浄化能力を発揮する温度まで昇温する前に走行風が当たって冷却しないように保温し、さらに溶接の始終端を走行風で冷却するようにしたり、全周の温度が均一になるように工夫した構成が記載されているが、遮熱板に当たった走行風を上記排気集合管の冷却に使用することで、上記問題の解消を図るという技術思想は全く示唆されていない。   In Patent Documents 3 and 4, the front surface or the periphery of the exhaust gas purification device is covered with a heat shield so that the traveling wind does not hit and cool before the temperature is raised to a temperature at which a predetermined purification performance is exhibited. It has been described that the temperature is maintained and the start and end of welding are cooled by running wind, and the temperature around the entire circumference is made uniform, but the running wind that hits the heat shield is There is no suggestion of the technical idea of solving the above problems by using the tube for cooling.

また、図5に示した構成では、第2の遮熱板24が排気ガス浄化装置22の前面の一部しか覆っていないので、排気ガス浄化装置22に走行風が当たって保温されず、特に始動後暫くの間浄化性能を十分に発揮されないという問題があるとともに、排気集合管21に向けて走行風を導く導風板25を別途に配設しているので、部品点数及び組付工数が増加し、コスト高になるという問題がある。   Further, in the configuration shown in FIG. 5, the second heat shield plate 24 covers only a part of the front surface of the exhaust gas purification device 22, so that the running air hits the exhaust gas purification device 22 and is not kept warm. There is a problem that the purification performance cannot be sufficiently exhibited for a while after the start, and the air guide plate 25 for guiding the traveling wind toward the exhaust collecting pipe 21 is separately provided, so that the number of parts and the number of assembling steps are reduced. There is a problem that the cost increases.

本発明は、上記従来の問題点に鑑み、排気ガス浄化装置の保温を図るとともに、排気集合管を効率的に冷却することができ、簡単な構成にて排気集合管の低廉化を図ることができる排気系の遮熱冷却装置を提供することを目的とする。   In view of the above-described conventional problems, the present invention can keep the exhaust gas purifying device warm and can efficiently cool the exhaust collecting pipe, thereby reducing the cost of the exhaust collecting pipe with a simple configuration. An object of the present invention is to provide a heat insulation cooling device for an exhaust system.

本発明の排気系の遮熱冷却装置は、内燃機関の車両前方側に排気集合管及び排気ガス浄化装置を配設した排気系において、排気集合管を覆う第1の遮熱板と、排気ガス浄化装置の少なくとも車両前方側を覆う第2の遮熱板とを備え、第2の遮熱板には、その外表面を流れる空気流を捕集する捕集部と、捕集部で捕集した空気流を排気集合管と第1の遮熱板の間の隙間に導く導風部とを備え、第2の遮熱板は排気ガス浄化装置の前面側を平面視で円弧状に覆うように形成されるとともに、その一側部に前向きに凹んだ捕集部が一側方に突出させて形成されており、この捕集部から上方に向けて上端が開放された浅溝状の導風部が形成され、自動車の走行に伴って前方から流入した走行風が、第2の遮熱板で受けられて捕集部で捕集され、導風部を通って上方に流出し、排気集合管と第1の遮熱板の間の隙間に導かれるように構成される。 According to the present invention, there is provided a heat insulation cooling device for an exhaust system, in an exhaust system in which an exhaust collecting pipe and an exhaust gas purification device are disposed on the vehicle front side of an internal combustion engine, and a first heat shielding plate that covers the exhaust collecting pipe; A second heat shield that covers at least the vehicle front side of the purification device; and a second heat shield that collects an air flow flowing on the outer surface of the second heat shield, and a collector that collects the air flow. And a second air shield that covers the front side of the exhaust gas purification device in an arc shape in plan view. In addition, a shallow groove-like air guide portion is formed with a forwardly recessed collecting portion projecting to one side thereof, and an upper end being opened upward from the collecting portion. The traveling wind that flows in from the front as the automobile travels is received by the second heat shield and collected by the collecting section, and the wind guiding section Through flows upward, configured to be guided to the clearance of the exhaust collecting pipe and the first heat shield plates.

この構成によると、排気ガス浄化装置の少なくとも車両前方側を覆う第2の遮熱板に走行風が当たることで、走行風にて排気ガス浄化装置が冷却されるのを防止して保温することができ、所定の浄化能力を確実に発揮することができ、かつ第2の遮熱板に当たった走行風がその捕集部で捕集されて導風部にて、排気集合管と排気集合管を覆う第1の遮熱板の間の隙間に導かれることで、導入された走行風にて排気集合管が効果的に冷却される。かくして、排気ガス浄化装置を保温して浄化性能を確保することができ、かつ第2の遮熱板の形状を工夫するだけで別部材を必要としない簡単な構成によって排気集合管を効率的に冷却することができ、排気集合管を安価な部材にて構成することができるので、排気集合管の低廉化を図ることができる。   According to this configuration, when the traveling wind hits the second heat shield plate that covers at least the vehicle front side of the exhaust gas purification device, the exhaust gas purification device is prevented from being cooled by the traveling wind and is kept warm. The traveling wind that hits the second heat shield plate is collected by the collecting section and the exhaust collecting pipe and the exhaust collecting are collected by the wind guiding section. The exhaust collecting pipe is effectively cooled by the introduced traveling wind by being guided into the gap between the first heat shield plates covering the pipe. Thus, the exhaust gas purification device can be kept warm by keeping the purification performance, and the exhaust collecting pipe can be efficiently constructed with a simple configuration that does not require a separate member only by devising the shape of the second heat shield plate. It is possible to cool the exhaust collecting pipe, and the exhaust collecting pipe can be constituted by an inexpensive member, so that the exhaust collecting pipe can be reduced in price.

また、内燃機関の車両前方側に排気集合管及び排気ガス浄化装置を配設した排気系において、排気集合管を覆う第1の遮熱板と、排気ガス浄化装置の少なくとも車両前方側を覆う第2の遮熱板とを備え、第2の遮熱板には、その外表面を流れる空気流を捕集する捕集部と、捕集部で捕集した空気流を排気集合管と第1の遮熱板の間の隙間に導く導風部とを設け、ラジエータファンを第2の遮熱板の前方に配設し、ラジエータファンによる送風の回転方向が捕集部から排気集合管と第1の遮熱板の間の隙間に向かう方向となるようにラジエータファンの回転方向を設定すると、ラジエータファンによる送風にて排気ガス浄化装置が冷却されるのを第2の遮熱板にて防止できるとともに、その送風を排気集合管と第1の遮熱板の間の隙間に導いて排気集合管を冷却することができ、例えば起動時や坂道走行時などに、走行風が少ないにも関わらず排気ガスにて排気集合管が高温になり易い場合でもラジエータファンによる送風にて排気集合管を確実に冷却することができる。 Further, in the exhaust system in which the exhaust collecting pipe and the exhaust gas purifying device are disposed on the vehicle front side of the internal combustion engine, the first heat shield plate that covers the exhaust collecting pipe and the first heat shielding plate that covers at least the vehicle front side of the exhaust gas purifying device. And a heat collecting plate for collecting the air flow flowing on the outer surface of the heat shielding plate, and an air collecting pipe for collecting the air flow collected by the collecting portion. An air guide portion that leads to a gap between the heat shield plates, a radiator fan is disposed in front of the second heat shield plate, and the rotation direction of the air blown by the radiator fan is from the collection portion to the exhaust collecting pipe and the first heat shield plate. When the rotation direction of the radiator fan is set so as to be in the direction toward the gap between the heat shield plates, the second heat shield plate can prevent the exhaust gas purification device from being cooled by the air blown by the radiator fan, and Guide the air to the gap between the exhaust collecting pipe and the first heat shield The air collecting pipe can be cooled.For example, when starting up or running on a slope, the exhaust collecting pipe is blown by a radiator fan even if the exhaust air collecting pipe tends to become hot due to exhaust gas even though the running wind is low. The tube can be reliably cooled.

本発明の排気系の遮熱冷却装置によれば、走行風を第2の遮熱板で受けることで排気ガス浄化装置の保温を図ることができるとともに、第2の遮熱板の捕集部で捕集した走行風を導風部にて排気集合管とそれを覆う第1の遮熱板の間の隙間に導入することで、走行風によって排気集合管を効率的に冷却することができ、簡単な構成にて排気集合管の低廉化を図ることができる。   According to the exhaust-system heat shield cooling device of the present invention, it is possible to keep the exhaust gas purification device warm by receiving the traveling wind with the second heat shield plate, and to collect the second heat shield plate. By introducing the traveling air collected in the above into the gap between the exhaust collecting pipe and the first heat shield covering it at the air guide section, the exhaust collecting pipe can be efficiently cooled by the traveling wind, With a simple structure, it is possible to reduce the cost of the exhaust collecting pipe.

以下、本発明の排気系の遮熱冷却装置の一実施形態について、図1〜図4を参照して説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of an exhaust system thermal insulation cooling device of the present invention will be described with reference to FIGS.

図1〜図4において、1は排気集合管で、その一端に設けられた接合フランジ1aが内燃機関のシリンダヘッドH(図2参照)に接合され、各排気口(図示せず)から排出された排ガスを集合して他端の接続口1bから排出するように構成されている。内燃機関E(図2参照)は、その気筒配列方向が自動車の車幅方向に沿いかつ各排気口が車両前方向(F方向)に位置するように配設されている。排気集合管1の他端の接続口1bは下向きに開口し、この接続口1bに排気ガス浄化装置2が接続されている。排気ガス浄化装置2は、筒状のケースの内部に排気ガスを浄化する触媒が充填して構成されており、その触媒としては、例えば300℃程度の所定の高温下で十分な浄化性能を発揮する触媒が適用されている。排気ガス浄化装置2の下端の出口フランジ2aには、車両後方向(R方向)に延設され、途中に消音器を有する排気管(図示せず)が接続される。   1 to 4, reference numeral 1 denotes an exhaust collecting pipe. A joining flange 1a provided at one end of the exhaust collecting pipe is joined to a cylinder head H (see FIG. 2) of the internal combustion engine and discharged from each exhaust port (not shown). The exhaust gas collected is collected and discharged from the connection port 1b at the other end. The internal combustion engine E (see FIG. 2) is disposed such that the cylinder arrangement direction is along the vehicle width direction of the automobile and each exhaust port is located in the vehicle front direction (F direction). The connection port 1b at the other end of the exhaust collecting pipe 1 opens downward, and the exhaust gas purification device 2 is connected to the connection port 1b. The exhaust gas purification device 2 is configured by filling a cylindrical case with a catalyst for purifying exhaust gas. As the catalyst, for example, a sufficient purification performance is exhibited at a predetermined high temperature of about 300 ° C. A catalyst is applied. An exhaust pipe (not shown) that extends in the rearward direction of the vehicle (R direction) and has a silencer is connected to the outlet flange 2a at the lower end of the exhaust gas purification device 2.

排気集合管1の上面と、シリンダヘッドH側の側面を除く三方の周側面を適当な隙間をあけて覆うように第1の遮熱板3が配設されている。第1の遮熱板3は下面が開放され、かつ上面の適所に流出口4が形成されている。また、排気ガス浄化装置2の車両前方側を適当な隙間をあけて覆うように第2の遮熱板5が配設されている。   A first heat shield plate 3 is disposed so as to cover the upper surface of the exhaust collecting pipe 1 and the three circumferential side surfaces excluding the side surface on the cylinder head H side with an appropriate gap. The lower surface of the first heat shield plate 3 is opened, and an outlet 4 is formed at an appropriate position on the upper surface. A second heat shield 5 is disposed so as to cover the vehicle front side of the exhaust gas purification device 2 with an appropriate gap.

第2の遮熱板5には、その外表面を流れる空気流を捕集する捕集部6と、捕集部6で捕集した空気流を排気集合管1と第1の遮熱板3の間の隙間に導く導風部7とが形成されている。具体的には、第2の遮熱板5は排気ガス浄化装置2の前面側を平面視で円弧状に覆うように形成されるとともに、その一側部に前向きに凹んだ捕集部6が一側方に突出させて形成されており、この捕集部6から上方に向けて上端が開放された浅溝状の導風部7が形成され、自動車の走行に伴って前方から流入した走行風8が、第2の遮熱板5で受けられて捕集部6で捕集され、導風部7を通って上方に流出し、排気集合管1と第1の遮熱板3の間の隙間に導かれるように構成されている。   The second heat shield plate 5 includes a collection unit 6 that collects an air flow flowing on the outer surface thereof, and an air flow collected by the collection unit 6 for the exhaust collecting pipe 1 and the first heat shield plate 3. A wind guide portion 7 is formed to guide the gap between the two. Specifically, the second heat shield plate 5 is formed so as to cover the front side of the exhaust gas purification device 2 in an arc shape in plan view, and a collecting portion 6 that is recessed forward is formed on one side thereof. A shallow groove-shaped air guide portion 7 is formed so as to protrude from one side and the upper end is opened upward from the collecting portion 6. The wind 8 is received by the second heat shield plate 5 and collected by the collecting portion 6, flows upward through the air guide portion 7, and is located between the exhaust collecting pipe 1 and the first heat shield plate 3. It is comprised so that it may be guide | induced to the clearance gap.

なお、9は排気ガス浄化装置2の入口部から排気ガスの一部を吸気側に供給するEGR配管であり、10は排気ガス浄化装置2を内燃機関EのシリンダブロックBに取り付ける取付ブラケットである。また、第1の遮熱板3は排気集合管1に適宜に突設された取付部(図示せず)に取付ボルト3aにて取り付けられ、第2の遮熱板5は排気ガス浄化装置2に適宜に突設された取付部(図示せず)に取付ボルト5aにて取り付けられている。   Reference numeral 9 denotes an EGR pipe that supplies part of the exhaust gas from the inlet of the exhaust gas purification device 2 to the intake side, and reference numeral 10 denotes a mounting bracket that attaches the exhaust gas purification device 2 to the cylinder block B of the internal combustion engine E. . The first heat shield plate 3 is attached to a fitting portion (not shown) appropriately projecting from the exhaust collecting pipe 1 with a mounting bolt 3a, and the second heat shield plate 5 is attached to the exhaust gas purification device 2. Are attached to mounting portions (not shown) appropriately projecting by mounting bolts 5a.

車両の前端部にはラジエータ(図示せず)が配設され、その後部の第2の遮熱板5の前方に、図1と図3に仮想線で示すように、ラジエータファン11が配設されている。このラジエータファン11の回転方向は、ラジエータファン11による送風の回転方向が捕集部6から導風部7を通って排気集合管1と第1の遮熱板3の間の隙間に向かう方向(図3中に示す矢印Aの方向)となるように設定されている。   A radiator (not shown) is disposed at the front end of the vehicle, and a radiator fan 11 is disposed in front of the second heat shield 5 at the rear thereof, as indicated by phantom lines in FIGS. Has been. The rotation direction of the radiator fan 11 is such that the rotation direction of the air blown by the radiator fan 11 passes from the collection unit 6 through the air guide unit 7 toward the gap between the exhaust collecting pipe 1 and the first heat shield plate 3 ( It is set to be in the direction of arrow A shown in FIG.

ラジエータファン11は、ラジエータの出口水温が所定温度以上になると駆動されるとともに、所定温度以下の場合でもアクセルの踏み込み量が大きくかつ負荷が大きい場合など、排気ガスの温度及び流量が大で、排気集合管1の温度が高くなる場合にも駆動され、走行風8だけでなく、ラジエータファン11による送風も、排気集合管1と第1の遮熱板3の間の隙間に供給されるように構成されている。   The radiator fan 11 is driven when the outlet water temperature of the radiator reaches a predetermined temperature or higher, and even when the temperature is lower than the predetermined temperature, the exhaust gas has a large exhaust gas temperature and flow rate, such as when the accelerator is depressed and the load is large. It is also driven when the temperature of the collecting pipe 1 becomes high so that not only the traveling wind 8 but also the air blown by the radiator fan 11 is supplied to the gap between the exhaust collecting pipe 1 and the first heat shield plate 3. It is configured.

以上の構成によれば、車両の走行時にエンジンルームに流入した走行風8は、排気ガス浄化装置2の車両前方側を覆う第2の遮熱板5に当たることで、走行風8が排気ガス浄化装置2に当たって排気ガス浄化装置2が冷却されるのを防止することができ、排気ガス浄化装置2を保温できて所定の浄化性能を確実に発揮することができる。しかも、第2の遮熱板5に当たった走行風は捕集部6で捕集され、その走行風8が導風部7にて排気集合管1と第1の遮熱板3の間の隙間に確実にかつ効率的に導かれることで、導入された走行風8にて排気集合管1が効果的に冷却される。   According to the above configuration, the traveling wind 8 that has flowed into the engine room during traveling of the vehicle hits the second heat shield plate 5 that covers the front side of the vehicle of the exhaust gas purification device 2, so that the traveling wind 8 purifies the exhaust gas. The exhaust gas purification device 2 can be prevented from being cooled by hitting the device 2, and the exhaust gas purification device 2 can be kept warm and a predetermined purification performance can be reliably exhibited. Moreover, the traveling wind hitting the second heat shield plate 5 is collected by the collection unit 6, and the traveling wind 8 is collected between the exhaust collecting pipe 1 and the first heat shield plate 3 by the wind guide portion 7. The exhaust collecting pipe 1 is effectively cooled by the introduced traveling wind 8 by being reliably and efficiently guided to the gap.

かくして、排気ガス浄化装置2が保温されて排ガス浄化能力が起動直後にも確保できるとともに、走行風8にて排気集合管1を効率的に冷却することができ、排気集合管1の高温部を構成する部材の材質を低廉な材質にて構成できてコスト低下を図ることができる。また、排気ガス浄化装置2の保温を図る第2の遮熱板5によって、別の導風板を設けることなく、排気集合管1と第1の遮熱板3の間の隙間に走行風8を導くように構成したので、部品点数及び組付工数を低減できてさらにコスト低下を図ることができる。   Thus, the exhaust gas purification device 2 is kept warm and the exhaust gas purification capability can be ensured immediately after startup, and the exhaust collecting pipe 1 can be efficiently cooled by the traveling wind 8, and the high temperature portion of the exhaust collecting pipe 1 can be reduced. The material of the constituent members can be made of an inexpensive material, and the cost can be reduced. Further, the second heat shield plate 5 that keeps the exhaust gas purification device 2 warm is provided with a running wind 8 in the gap between the exhaust collecting pipe 1 and the first heat shield plate 3 without providing a separate air guide plate. Therefore, the number of parts and the number of assembling steps can be reduced, and the cost can be further reduced.

また、第2の遮熱板5の前方に配設したラジエータファン11による送風の回転方向が捕集部6から導風部7を通して排気集合管1と第1の遮熱板3の間の隙間に向かう方向となるように、ラジエータファン11の回転方向を設定しているので、走行風8が少ないときにも、ラジエータファン11による送風にて排気ガス浄化装置2が冷却されるのを第2の遮熱板5にて防止できるとともに、その送風を排気集合管1と第1の遮熱板3の間の隙間に確実にかつ効率的に導いて排気集合管1を冷却することができ、例えば起動時や坂道走行時などに、走行風が少ないにも関わらず排気ガスにて排気集合管1が高温になり易い場合でもラジエータファン11による送風にて排気集合管1を確実に冷却することができる。   In addition, the rotation direction of the air blown by the radiator fan 11 disposed in front of the second heat shield plate 5 passes from the collection unit 6 through the air guide unit 7 to the gap between the exhaust collecting pipe 1 and the first heat shield plate 3. Since the rotation direction of the radiator fan 11 is set so as to be directed to the second direction, the exhaust gas purification device 2 is cooled by the air blown by the radiator fan 11 even when the traveling wind 8 is small. The heat shield plate 5 can prevent the air flow and reliably and efficiently guide the air flow to the gap between the exhaust collector pipe 1 and the first heat shield plate 3 to cool the exhaust collector pipe 1. For example, even when the running wind is low and the exhaust collecting pipe 1 is likely to become hot due to exhaust gas at the time of starting or running on a hill, the exhaust collecting pipe 1 is reliably cooled by blowing with the radiator fan 11. Can do.

なお、以上の実施形態においては、第2の遮熱板5が排気ガス浄化装置2の前面側のみを覆うように構成した例を示したが、本発明はこれに限定されるものでなく、排気ガス浄化装置2のほぼ全周を取り囲むように構成しても良く、その場合にも前部の一側に捕集部6と導風部7を設けることで、同様の作用効果を奏することができる。   In the above embodiment, the example in which the second heat shield plate 5 is configured to cover only the front side of the exhaust gas purification device 2 has been shown, but the present invention is not limited to this, The exhaust gas purification device 2 may be configured so as to surround almost the entire circumference, and in this case, the same effect can be obtained by providing the collection portion 6 and the air guide portion 7 on one side of the front portion. Can do.

本発明の排気系の遮熱冷却装置は、走行風を第2の遮熱板で受けることで排気ガス浄化装置の保温を図ることができるとともに、第2の遮熱板の捕集部で捕集した走行風を導風部にて排気集合管とそれを覆う第1の遮熱板の間の隙間に導入することで、走行風によって排気集合管を効率的に冷却することができ、簡単な構成にて排気集合管の低廉化を図ることができ、自動車の排気系に好適に利用できる。   The heat insulation cooling device for the exhaust system of the present invention can keep the exhaust gas purification device warm by receiving the traveling wind with the second heat insulation plate, and can capture the heat at the collecting portion of the second heat insulation plate. By introducing the collected traveling wind into the gap between the exhaust collecting pipe and the first heat shield covering it at the air guide section, the exhaust collecting pipe can be efficiently cooled by the traveling wind, and a simple configuration Can reduce the cost of the exhaust collecting pipe and can be suitably used for an exhaust system of an automobile.

本発明に係る排気系の遮熱冷却装置の一実施形態の縦断側面図。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view of an embodiment of an exhaust system heat shield cooling device according to the present invention. 同実施形態の側面図。The side view of the embodiment. 同実施形態の正面図。The front view of the embodiment. 同実施形態の斜視図。The perspective view of the embodiment. 従来例の排気系の遮熱冷却装置の正面図。The front view of the heat insulation cooling device of the exhaust system of a prior art example.

符号の説明Explanation of symbols

1 排気集合管
2 排気ガス浄化装置
3 第1の遮熱板
5 第2の遮熱板
6 捕集部
7 導風部
8 送風風
11 ラジエータファン
DESCRIPTION OF SYMBOLS 1 Exhaust gas collection pipe 2 Exhaust gas purification apparatus 3 1st heat shield plate 5 2nd heat shield plate 6 Collection part 7 Air guide part 8 Blowing air 11 Radiator fan

Claims (2)

内燃機関の車両前方側に排気集合管及び排気ガス浄化装置を配設した排気系において、
排気集合管を覆う第1の遮熱板と、
排気ガス浄化装置の少なくとも車両前方側を覆う第2の遮熱板とを備え、
第2の遮熱板には、
その外表面を流れる空気流を捕集する捕集部と、
捕集部で捕集した空気流を排気集合管と第1の遮熱板の間の隙間に導く導風部と
備え、
第2の遮熱板は排気ガス浄化装置の前面側を平面視で円弧状に覆うように形成されるとともに、その一側部に前向きに凹んだ捕集部が一側方に突出させて形成されており、この捕集部から上方に向けて上端が開放された浅溝状の導風部が形成され、自動車の走行に伴って前方から流入した走行風が、第2の遮熱板で受けられて捕集部で捕集され、導風部を通って上方に流出し、排気集合管と第1の遮熱板の間の隙間に導かれるように構成されたことを特徴とする排気系の遮熱冷却装置。
In an exhaust system in which an exhaust collecting pipe and an exhaust gas purification device are disposed on the vehicle front side of the internal combustion engine,
A first heat shield covering the exhaust collecting pipe;
A second heat shield that covers at least the vehicle front side of the exhaust gas purification device,
The second heat shield
A collecting part for collecting the airflow flowing on the outer surface;
An air guide section that guides the air flow collected by the collection section to the gap between the exhaust collecting pipe and the first heat shield plate ;
The second heat shield plate is formed so as to cover the front side of the exhaust gas purifying device in an arc shape in plan view, and a collecting portion recessed forward is formed on one side of the exhaust gas purification device so as to protrude to one side. A shallow groove-shaped air guide portion whose upper end is opened upward from the collection portion is formed, and the traveling wind that flows from the front along with the traveling of the automobile is the second heat shield plate. The exhaust system is configured to be received and collected by the collection unit, to flow upward through the air guide unit, and to be guided to a gap between the exhaust collecting pipe and the first heat shield plate . Thermal insulation cooling device.
内燃機関の車両前方側に排気集合管及び排気ガス浄化装置を配設した排気系において、排気集合管を覆う第1の遮熱板と、排気ガス浄化装置の少なくとも車両前方側を覆う第2の遮熱板とを備え、第2の遮熱板には、その外表面を流れる空気流を捕集する捕集部と、捕集部で捕集した空気流を排気集合管と第1の遮熱板の間の隙間に導く導風部とを設け、
ラジエータファンを第2の遮熱板の前方に配設し、ラジエータファンによる送風の回転方向が捕集部から排気集合管と第1の遮熱板の間の隙間に向かう方向となるようにラジエータファンの回転方向を設定したことを特徴とする排気系の遮熱冷却装置。
In an exhaust system in which an exhaust collecting pipe and an exhaust gas purification device are disposed on the vehicle front side of the internal combustion engine, a first heat shield plate that covers the exhaust collecting pipe and a second heat shielding plate that covers at least the vehicle front side of the exhaust gas purification device. A heat shield plate, and the second heat shield plate has a collecting portion for collecting the air flow flowing on the outer surface thereof, and the air flow collected by the collecting portion for the exhaust collecting pipe and the first shield plate. And a wind guide portion that leads to the gap between the hot plates,
A radiator fan is disposed in front of the second heat shield plate, and the rotation direction of the air blown by the radiator fan is such that the direction of rotation of the radiator fan is a direction from the collection portion toward the gap between the exhaust collecting pipe and the first heat shield plate. An exhaust heat insulation cooling device characterized in that the rotation direction is set.
JP2008176211A 2008-07-04 2008-07-04 Exhaust heat insulation cooling system Expired - Fee Related JP5202140B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008176211A JP5202140B2 (en) 2008-07-04 2008-07-04 Exhaust heat insulation cooling system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008176211A JP5202140B2 (en) 2008-07-04 2008-07-04 Exhaust heat insulation cooling system

Publications (2)

Publication Number Publication Date
JP2010014069A JP2010014069A (en) 2010-01-21
JP5202140B2 true JP5202140B2 (en) 2013-06-05

Family

ID=41700384

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2008176211A Expired - Fee Related JP5202140B2 (en) 2008-07-04 2008-07-04 Exhaust heat insulation cooling system

Country Status (1)

Country Link
JP (1) JP5202140B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5896616B2 (en) * 2011-03-31 2016-03-30 ダイハツ工業株式会社 Heat shield structure of exhaust path
JP6243599B2 (en) * 2012-11-30 2017-12-06 ダイハツ工業株式会社 Internal combustion engine
GB2562228B (en) * 2017-05-08 2019-12-04 Jaguar Land Rover Ltd Heat Retention apparatus and method
CN113389631B (en) * 2021-06-30 2022-07-08 重庆长安汽车股份有限公司 Flow guide structure for improving local high temperature at exhaust side of longitudinally-arranged engine assembly

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5621616Y2 (en) * 1976-04-12 1981-05-21
JP2917588B2 (en) * 1991-07-09 1999-07-12 トヨタ自動車株式会社 Exhaust system cooling device
JP3196523B2 (en) * 1994-09-28 2001-08-06 トヨタ自動車株式会社 Exhaust heat insulator for internal combustion engine
JPH08189334A (en) * 1994-12-28 1996-07-23 Nissan Motor Co Ltd Exhaust cooling device for vehicle
JP3580709B2 (en) * 1998-10-23 2004-10-27 トヨタ自動車株式会社 Catalytic converter
JP2001152843A (en) * 1999-11-25 2001-06-05 Suzuki Motor Corp Insulator structure of catalyst case
JP4375061B2 (en) * 2004-03-03 2009-12-02 日産自動車株式会社 Heat insulation structure of exhaust manifold and catalyst

Also Published As

Publication number Publication date
JP2010014069A (en) 2010-01-21

Similar Documents

Publication Publication Date Title
US9394817B2 (en) Cooling structure for urea aqueous solution conduit
US7841323B2 (en) Internal-combustion engine having a cooled exhaust gas recirculation system as well as an exhaust gas manifold
KR20160055282A (en) Turbine casing of an exhaust-gas turbocharger
JP5407833B2 (en) Blowby gas recirculation system
JP2007145130A (en) Motorcycle
JP5202140B2 (en) Exhaust heat insulation cooling system
JP4267654B2 (en) Exhaust gas recirculation device for internal combustion engine
JP2005201093A (en) Cooling device of vehicle engine
WO2017022217A1 (en) Work vehicle
JP4267349B2 (en) Exhaust gas recirculation device for internal combustion engine
CN110816745B (en) Motorcycle with a motorcycle body
JP4958075B2 (en) Turbocharged engine
JP2011038467A (en) Exhaust gas recirculating device of engine
US11499509B2 (en) Engine exhaust gas recirculation system
JP2008067635A (en) Combine harvester
JP2008267325A (en) Piping structure for vehicular intercooler
JP2018105182A (en) Vehicle exhaust system structure
JP2005225383A (en) Lower structure of motorcycle body
CN115151718A (en) Exhaust manifold with integrated thermal insulation and thermosiphon
JP6416052B2 (en) Work vehicle
JP7275873B2 (en) vehicle front structure
JP2010216348A (en) Air-cooled cooling device of internal combustion engine for vehicle
JP3344210B2 (en) Double pipe exhaust manifold
JP7293882B2 (en) engine exhaust structure
KR101286061B1 (en) Heat shield for exhaust manifold

Legal Events

Date Code Title Description
RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20091105

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20110627

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120321

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120322

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120516

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20121127

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20130109

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20130212

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20130212

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20160222

Year of fee payment: 3

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees