JPH0893470A - Exhaust heat insulator for internal combustion engine - Google Patents
Exhaust heat insulator for internal combustion engineInfo
- Publication number
- JPH0893470A JPH0893470A JP23317194A JP23317194A JPH0893470A JP H0893470 A JPH0893470 A JP H0893470A JP 23317194 A JP23317194 A JP 23317194A JP 23317194 A JP23317194 A JP 23317194A JP H0893470 A JPH0893470 A JP H0893470A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust manifold
- heat insulator
- exhaust
- circulating air
- air intake
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
- F01N2260/022—Exhaust treating devices having provisions not otherwise provided for for cooling the device using air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
- F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
- F01N2260/20—Exhaust treating devices having provisions not otherwise provided for for heat or sound protection, e.g. using a shield or specially shaped outer surface of exhaust device
Landscapes
- Exhaust Silencers (AREA)
Abstract
(57)【要約】
【目的】 排気マニホルド集合部の全外周面を均一に冷
却する。
【構成】 排気ヒートインシュレータ３を排気マニホル
ド２の表側を覆う表側ヒートインシュレータ４と、排気
マニホルド２の裏側を覆う裏側ヒートインシュレータ５
とにより構成する。走行風が一方では表側ヒートインシ
ュレータ４上に形成された第１の流通風取入口６を通っ
て排気マニホルド２の表側に供給され、他方では排気マ
ニホルド２の両側に形成された一対の第２の流通風取入
口８ａ，８ｂを介して排気マニホルド２の裏面に供給さ
れる。
(57) [Summary] [Purpose] To uniformly cool the entire outer peripheral surface of the exhaust manifold assembly. [Structure] A front heat insulator 4 that covers the exhaust heat insulator 3 on the front side of the exhaust manifold 2, and a back heat insulator 5 that covers the back side of the exhaust manifold 2.
It consists of and. On the one hand, traveling wind is supplied to the front side of the exhaust manifold 2 through a first circulation air intake 6 formed on the front heat insulator 4, and on the other hand, a pair of second air passages formed on both sides of the exhaust manifold 2. It is supplied to the back surface of the exhaust manifold 2 through the circulating air intake ports 8a and 8b.
Description
【０００１】[0001]
【産業上の利用分野】本発明は内燃機関の排気ヒートイ
ンシュレータに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust heat insulator for an internal combustion engine.
【０００２】[0002]
【従来の技術】排気マニホルドが発する輻射熱を遮幣す
るために排気マニホルドをヒートインシュレータにより
覆い、更にヒートインシュレータ上に走行風を取入れる
ための走行風取入口を形成して走行風取入口からヒート
インシュレータ内に流入した走行風により排気マニホル
ドを冷却するようにした種々の構造の排気ヒートインシ
ュレータが公知である。2. Description of the Related Art The exhaust manifold is covered with a heat insulator in order to shield the radiant heat generated by the exhaust manifold, and a traveling wind intake for taking in traveling wind is formed on the heat insulator to heat the exhaust air from the traveling wind intake. Exhaust heat insulators of various structures are known in which the exhaust manifold is cooled by the running wind that has flowed into the insulator.
【０００３】例えば実開平２−７８７１８号公報に記載
された排気ヒートインシュレータでは走行風取入口から
流入した走行風によって排気マニホルドの外側面を、即
ち走行風の流れ方向からみて上流側に位置する排気マニ
ホルド表面を主に冷却するようにしてより、また実開平
２−２２６２０号公報に記載された排気ヒートインシュ
レータでは走行風取入口から流入した走行風によって排
気マニホルドの内側面を、即ち走行風の流れ方向からみ
て下流側に位置する排気マニホルド裏面を冷却するよう
にしている。For example, in the exhaust heat insulator disclosed in Japanese Utility Model Laid-Open No. 2-78718, the exhaust air located on the outer side surface of the exhaust manifold, that is, on the upstream side when viewed from the flow direction of the traveling air, is caused by the traveling air flowing from the traveling air intake. In addition to mainly cooling the surface of the manifold, in the exhaust heat insulator described in Japanese Utility Model Laid-Open No. 22226/1990, the running air flowing from the running air intake port causes the inner surface of the exhaust manifold, that is, the flow of the running air to flow. The rear surface of the exhaust manifold located on the downstream side when viewed from the direction is cooled.
【０００４】[0004]
【発明が解決しようとする課題】このように従来の排気
ヒートインシュレータでは排気マニホルド表面か排気マ
ニホルド裏面のいずれか一方が走行風によって主に冷却
される構造となっており、従って排気マニホルド表面お
よび排気マニホルド裏面の温度を一様に低くすることが
できないという問題がある。As described above, in the conventional exhaust heat insulator, one of the exhaust manifold front surface and the exhaust manifold rear surface is mainly cooled by the running wind. Therefore, the exhaust manifold surface and the exhaust manifold are cooled. There is a problem that the temperature on the rear surface of the manifold cannot be lowered uniformly.
【０００５】[0005]
【課題を解決するための手段】上記問題点を解決するた
めに１番目の発明では、エンジンルーム内を流通する流
通風の流れ方向に対して上流側に位置する排気マニホル
ド表面と流通風の流れ方向に対して下流側に位置する排
気マニホルド裏面とを覆う排気ヒートインシュレータに
おいて、排気ヒートインシュレータを排気マニホルドか
ら間隔を隔てて排気マニホルド表面および排気マニホル
ド両側面を覆う表側ヒートインシュレータと、排気マニ
ホルドから間隔を隔てて排気マニホルド裏面および排気
マニホルド両側面を覆う裏側ヒートインシュレータとに
より構成し、排気マニホルド表面を覆う表側ヒートイン
シュレータ部分に第１の流通風取入口を形成すると共に
排気マニホルド裏面を覆う裏側ヒートインシュレータ部
分に流通風排出口を形成し、更に排気マニホルド両側面
を覆う裏側ヒートインシュレータ部分に夫々流通風の流
れ方向上流に向けて開口する第２の流通風取入口を形成
している。In order to solve the above problems, in the first aspect of the invention, the surface of the exhaust manifold located upstream of the flow direction of the circulating air flowing in the engine room and the flow of the circulating air. In the exhaust heat insulator that covers the back surface of the exhaust manifold located downstream with respect to the direction, the exhaust heat insulator is separated from the exhaust manifold by a front heat insulator that covers the exhaust manifold surface and both side surfaces of the exhaust manifold, and the exhaust heat insulator is separated from the exhaust manifold. And a back side heat insulator that covers the exhaust manifold rear surface and both sides of the exhaust manifold, and forms a first circulating air intake port in the front side heat insulator portion that covers the exhaust manifold surface and also covers the exhaust manifold rear surface. Circulation air outlet in part Formed, to form a second flow wind intake that opens toward further in the flow direction upstream of the respective flow ventilation to the back side heat insulator portion covering the exhaust manifold sides.
【０００６】また、２番目の発明では上記問題点を解決
するために１番目の発明において、第２の流通風取入口
の開口面積の総和が第１の流通風取入口の開口面積の総
和よりも大きくされている。また、３番目の発明では上
記問題点を解決するために１番目の発明において、隣接
する排気マニホルド枝管の二又分岐部から間隔を隔てつ
つ二又分岐部に沿って表側ヒートインシュレータから裏
側ヒートインシュレータに向けて延びる流通風案内壁を
形成している。In the second invention, in order to solve the above-mentioned problems, in the first invention, the sum of the opening areas of the second circulation air intake is smaller than the sum of the opening areas of the first circulation air intake. Has also been made larger. In order to solve the above problems, the third aspect of the present invention is the first aspect of the present invention, in which the front heat insulator to the back side heat are separated from the front heat insulator along the bifurcation branch while being spaced from the bifurcation branch of the adjacent exhaust manifold branch pipe. A circulation air guide wall extending toward the insulator is formed.
【０００７】[0007]
【作用】１番目の発明では、第１の流通風取入口から流
入した流通風は排気マニホルド表面、排気マニホルド両
側面、排気マニホルド裏面に沿って流れた後に流通風排
出口から排出される。第２の流通風取入口から流入した
流通風は排気マニホルド裏面に沿って流れた後に流通風
排出口から排出される。In the first aspect of the present invention, the circulating air that has flowed in through the first circulating air inlet flows along the front surface of the exhaust manifold, both side surfaces of the exhaust manifold, and the rear surface of the exhaust manifold, and is then discharged from the circulating air outlet. The circulation air that has flowed in from the second circulation air inlet flows along the back surface of the exhaust manifold and is then discharged from the circulation air outlet.
【０００８】２番目の発明では、第２の流通風取入口の
開口面積の総和を第１の流通風取入口の開口面積の総和
よりも大きくすることによって第２の流通風取入口から
多量の流通風が流入せしめられる。３番目の発明では、
流通風案内壁に沿って流れる流通風により排気マニホル
ド枝管の二又分岐部が冷却される。According to the second aspect of the present invention, the sum of the opening areas of the second circulating air intakes is made larger than the total of the opening areas of the first circulating air intakes, so that a large amount of air is introduced from the second circulating air intakes. Circulation air is introduced. In the third invention,
The bifurcated portion of the exhaust manifold branch pipe is cooled by the circulating air flowing along the circulating air guide wall.
【０００９】[0009]
【実施例】図１から図４を参照すると、１は機関本体、
２は複数本の枝管２ａと集合部２ｂとからなる排気マニ
ホルド、３はエンジンルーム内を流れる流通風、例えば
走行風Ｘ（図３）の流れ方向に対して上流側に位置する
排気マニホルド表面Ａと走行風Ｘの流れ方向に対して下
流側に位置する排気マニホルド裏面Ｂとを覆う排気ヒー
トインシュレータを夫々示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 4, 1 is an engine body,
Reference numeral 2 denotes an exhaust manifold including a plurality of branch pipes 2a and a collecting portion 2b. Reference numeral 3 denotes an exhaust manifold surface located on the upstream side with respect to a flow direction of a circulating air flow in the engine room, for example, traveling air X (FIG. 3). The exhaust heat insulators that cover A and the exhaust manifold rear surface B located on the downstream side with respect to the flow direction of the traveling wind X are shown respectively.
【００１０】排気ヒートインシュレータ３は排気マニホ
ルド２から間隔を隔てて排気マニホルド表面Ａおよび排
気マニホルド両側面Ｃを覆う表側ヒートインシュレータ
４と、排気マニホルド２から間隔を隔てて排気マニホル
ド裏面Ｂおよび排気マニホルド両側面Ｃを覆う裏側ヒー
トインシュレータ５とにより構成される。排気マニホル
ド集合部２ｂの排気マニホルド表面Ａを覆う表側ヒート
インシュレータ４部分には複数個の第１の流通風取入口
６が形成され、排気マニホルド裏面Ｂを覆う裏側ヒート
インシュレータ５部分には流通風排出口７が形成され
る。The exhaust heat insulator 3 includes a front heat insulator 4 that covers the exhaust manifold surface A and both side surfaces C of the exhaust manifold at a distance from the exhaust manifold 2, and an exhaust manifold rear surface B and both sides of the exhaust manifold at a distance from the exhaust manifold 2. It is composed of a backside heat insulator 5 that covers the surface C. A plurality of first circulation air intakes 6 are formed in the front heat insulator 4 portion that covers the exhaust manifold surface A of the exhaust manifold collecting portion 2b, and a circulation air exhaust portion is formed in the rear heat insulator 5 portion that covers the exhaust manifold rear surface B. The outlet 7 is formed.
【００１１】一方、排気マニホルド両側面Ｃを覆う裏側
ヒートインシュレータ５部分の上方部および下方部は表
側ヒートインシュレータ４の表面上に重なるように配置
され、排気マニホルド両側面Ｃを覆う裏側ヒートインシ
ュレータ５部分の中央部５ａ，５ｂは表側ヒートインシ
ュレータ４から間隔を隔だてるように表側ヒートインシ
ュレータ４から外方に向けて膨出せしめられる。図４に
示されるように表側ヒートインシュレータ４の両端部４
ａ，４ｂは排気マニホルド側壁面Ｃに沿いつつ排気マニ
ホルド裏面Ｂに向けて内方に湾曲せしめられており、裏
側ヒートインシュレータ５の中央部５ａ，５ｂは表側ヒ
ートインシュレータ４の両端部４ａ，４ｂを覆うように
して表側ヒートインシュレータ４の両端部４ａ，４ｂの
周りに延びている。従って排気マニホルド両側部Ｃの側
方において表側ヒートインシュレータ４の両端部４ａ，
４ｂと裏側ヒートインシュレータ５の中央部５ａ，５ｂ
との間には夫々走行風Ｘの流れ方向上流に向けて開口す
る第２の流通風取入口８ａ，８ｂが形成される。図１か
らわかるように第２の流通風取入口８ａ，８ｂの開口面
積の総和は第１の流通風取入口６の開口面積の総和より
もかなり大きくされている。On the other hand, the upper and lower portions of the rear heat insulator 5 portion covering both side surfaces C of the exhaust manifold are arranged so as to overlap with the surface of the front heat insulator 4, and the rear heat insulator 5 portion covering both side surfaces C of the exhaust manifold. The central portions 5a and 5b of the are bulged outward from the front heat insulator 4 so as to be spaced apart from the front heat insulator 4. As shown in FIG. 4, both end portions 4 of the front heat insulator 4 are
a and 4b are curved inward toward the exhaust manifold rear surface B along the exhaust manifold side wall surface C, and the central portions 5a and 5b of the back side heat insulator 5 are located at both end portions 4a and 4b of the front side heat insulator 4. It extends around both ends 4a, 4b of the front heat insulator 4 so as to cover it. Therefore, on both sides of the exhaust manifold both sides C, both ends 4a of the front heat insulator 4 are
4b and central portions 5a and 5b of the back side heat insulator 5
The second circulating air intakes 8a and 8b are formed between and, respectively, and open upstream in the flow direction of the traveling wind X. As can be seen from FIG. 1, the total sum of the opening areas of the second circulating air intakes 8a and 8b is considerably larger than the total sum of the opening areas of the first circulating air intake 6.
【００１２】走行風Ｘが発生するとこの走行風Ｘは一方
では図４の矢印Ｘ1 で示されるように第１の流通風取入
口６から排気ヒートインシュレータ３内に流入し、他方
では図４の矢印Ｘ2 で示されるように第２の流通風取入
口８ａ，８ｂから排気ヒートインシュレータ３内に流入
する。第１の流通風取入口６から流入した走行風は表側
ヒートインシュレータ４により案内されて順次排気マニ
ホルド表面Ａ、排気マニホルド両側面Ｃ、排気マニホル
ド裏面Ｂに沿って進み、次いで矢印Ｘ3 で示されるよう
に流通風排出口７から排気ヒートインシュレータ３の外
部に排出される。この間、排気マニホルド２は走行風Ｘ
1 によって冷却される。When the traveling wind X is generated, the traveling wind X flows into the exhaust heat insulator 3 from the first circulating air intake 6 as shown by an arrow X 1 in FIG. As shown by the arrow X 2 , it flows into the exhaust heat insulator 3 from the second circulating air intakes 8a and 8b. The traveling wind that has flowed in from the first circulation air intake 6 is guided by the front heat insulator 4 and sequentially advances along the exhaust manifold front surface A, the exhaust manifold both side surfaces C, and the exhaust manifold rear surface B, and then is indicated by an arrow X 3. As described above, the air is discharged from the exhaust air insulator 3 to the outside of the exhaust heat insulator 3. During this time, the exhaust manifold 2 keeps the running wind X.
Cooled by 1 .
【００１３】一方、第２の流通風取入口８ａ，８ｂから
流入した走行風Ｘ2 は裏側ヒートインシュレータ５によ
り案内されて排気マニホルド裏面Ｂに沿って進み、次い
で矢印Ｘ3 で示すように流通風排出口７から排気ヒート
インシュレータ３の外部に排出される。この間、排気マ
ニホルド裏面Ｂは走行風Ｘ2 によっても冷却される。即
ち、排気マニホルド裏面Ｂは第１の流通風取入口６から
流入した走行風Ｘ1 によっても冷却されるが走行風Ｘ1
が排気マニホルド裏面Ｂに達する頃にはかなり温度上昇
しており、従って排気マニホルド裏面Ｂを走行風Ｘ1 の
みでは十分に冷却することができない。そこで第２の流
通風取入口８ａ，８ｂから比較的低温の走行風Ｘ2 を流
入させてこの走行風Ｘ2 より排気マニホルド裏面Ｂを冷
却し、それによって排気マニホルド２の中で温度が最も
高くなる排気マニホルド集合部２ｂの全外周面を一様に
冷却するようにしている。On the other hand, the traveling wind X 2 that has flowed in from the second circulation air intakes 8a, 8b is guided by the back side heat insulator 5 and advances along the back surface B of the exhaust manifold, and then the circulation air X 2 as shown by the arrow X 3. It is discharged from the discharge port 7 to the outside of the exhaust heat insulator 3. During this time, the back surface B of the exhaust manifold is also cooled by the running wind X 2 . That is, the back surface B of the exhaust manifold is also cooled by the traveling wind X 1 flowing in from the first circulation air intake 6, but the traveling wind X 1
When the temperature reaches the exhaust manifold rear surface B, the temperature has risen considerably, and therefore the exhaust manifold rear surface B cannot be sufficiently cooled only by the traveling wind X 1 . Therefore, a relatively low-temperature running wind X 2 is introduced from the second circulating air intakes 8a and 8b to cool the exhaust manifold rear surface B from the running wind X 2 , whereby the temperature in the exhaust manifold 2 becomes the highest. The entire outer peripheral surface of the exhaust manifold collecting portion 2b is uniformly cooled.
【００１４】ところで前述したように走行風Ｘ1 が排気
マニホルド裏面Ｂに達する頃にはかなり温度上昇をして
おり、従ってこの場合走行風Ｘ1 の量と走行風Ｘ2 の量
とが同量程度であると排気マニホルド裏面Ｂに沿って流
れる走行風Ｘ1 ，Ｘ2 の混合風の温度は走行風Ｘよりも
かなり高くなってしまう。その結果、排気マニホルド裏
面Ｂを十分に冷却することが困難となる。この場合、排
気マニホルド裏面Ｂを十分に冷却するには排気マニホル
ド裏面Ｂに沿って流れる走行風Ｘ1 ，Ｘ2 の混合風の温
度を低下させる必要があり、そのためには走行風Ｘ2 の
量を走行風Ｘ1の量よりも多くする必要がある。従って
本発明による実施例では走行風Ｘ2 の量を走行風Ｘ1 の
量よりも多くするために第２の流通風取入口８ａ，８ｂ
の開口面積の総和を第１の流通風取入口６の開口面積の
総和よりも大きくするようにしている。By the way running wind X 1 as described above has a significant temperature rise by the time to reach the exhaust manifold back surface B, therefore the amount and the same amount of running wind X 2 and where the amount of traveling wind X 1 If it is about the same, the temperature of the mixed wind of the traveling winds X 1 and X 2 flowing along the back surface B of the exhaust manifold becomes considerably higher than the traveling wind X. As a result, it becomes difficult to sufficiently cool the back surface B of the exhaust manifold. In this case, in order to sufficiently cool the exhaust manifold rear surface B, it is necessary to reduce the temperature of the mixed air of the traveling winds X 1 and X 2 flowing along the exhaust manifold rear surface B, and for that purpose, the amount of the traveling wind X 2 is required. Must be greater than the amount of running wind X 1 . Therefore, in the embodiment according to the present invention, in order to make the amount of the traveling wind X 2 larger than the amount of the traveling wind X 1 , the second circulation air intakes 8a, 8b are provided.
The sum of the opening areas of the first circulating air intake 6 is made larger than the sum of the opening areas of the first circulating air intake 6.
【００１５】図５から図８に別の実施例を示す。この実
施例は排気マニホルド集合部２ｂの全外周面を均一に冷
却することに加えて内側に位置する二つの排気マニホル
ド枝管２ａの二又分岐部９を冷却するようにした排気ヒ
ートインシュレータ３を示している。即ち、内燃機関で
は機関本体１は冷却水により冷却されているのでかなり
温度が低く、従って各排気マニホルド枝管２ａの機関本
体１への取付部の温度はかなり低くなっている。これに
対して排気マニホルド集合部２ｂの温度はかなり高くな
る。その結果排気マニホルド枝管２ａはその上流端と下
流端でかなりの温度差が生じ、斯くして各排気マニホル
ド枝管２ａの下流端は上流端に対して側方に熱膨張する
ことになる。このとき外側に位置する二つの排気マニホ
ルド枝管２ａは比較的自由に側方に熱膨張しうるが内側
に位置する二つの排気マニホルド枝管２ａは外側に位置
する二つの排気マニホルド枝管２ａにより膨張作用が拘
束されるために自由に側方に熱膨張しえない。その結
果、二又分岐部９には大きな熱応力が発生し、斯くして
二又分岐部９に亀裂が発生する危険性が生じることにな
る。そこで図５から図８に示す実施例では二又分岐部９
に亀裂が発生するのを阻止するために二又分岐部９を積
極的に冷却するようにしている。Another embodiment is shown in FIGS. In this embodiment, in addition to uniformly cooling the entire outer peripheral surface of the exhaust manifold collecting portion 2b, the exhaust heat insulator 3 which cools the bifurcated branch portion 9 of the two exhaust manifold branch pipes 2a located inside is provided. Shows. That is, in the internal combustion engine, since the engine body 1 is cooled by the cooling water, the temperature is considerably low, and therefore, the temperature of the mounting portion of each exhaust manifold branch pipe 2a to the engine body 1 is considerably low. On the other hand, the temperature of the exhaust manifold collecting portion 2b becomes considerably high. As a result, the exhaust manifold branch pipe 2a has a considerable temperature difference between the upstream end and the downstream end thereof, so that the downstream end of each exhaust manifold branch pipe 2a thermally expands laterally with respect to the upstream end. At this time, the two exhaust manifold branch pipes 2a located outside can be thermally expanded to the side relatively freely, but the two exhaust manifold branch pipes 2a located inside are formed by the two exhaust manifold branch pipes 2a located outside. It cannot freely expand laterally due to the restricted expansion. As a result, a large thermal stress is generated in the bifurcated portion 9, and thus there is a risk of cracks in the bifurcated portion 9. Therefore, in the embodiment shown in FIG. 5 to FIG.
The bifurcated bifurcation 9 is positively cooled in order to prevent the occurrence of cracks in it.
【００１６】即ち、図５から図８に示される実施例では
内側に位置する二つの排気マニホルド枝管２ａ間を覆う
表側ヒートインシュレータ４部分を内方に折曲すること
により流通風案内壁１０が形成される。この流通風案内
壁１０は図７に示されるように二又分岐部９から間隔を
隔てつつ二又分岐部９に沿って表側ヒートインシュレー
タ４から裏側ヒートインシュレータ５に向けて延びてお
り、更に図８に示されるように二又分岐部９と流通風案
内側１０との間隙ｄ1 は各排気マニホルド枝管２ａと流
通風案内壁１０との間隙ｄ2 よりも大きく形成されてい
る。That is, in the embodiment shown in FIGS. 5 to 8, the front air heat insulator 4 portion which covers the space between the two exhaust manifold branch pipes 2a located inside is bent inward so that the circulating air guide wall 10 is formed. It is formed. As shown in FIG. 7, the circulating air guide wall 10 extends from the front heat insulator 4 to the back heat insulator 5 along the bifurcated branch 9 while being spaced from the bifurcated branch 9 and further illustrated in FIG. As shown in FIG. 8, the gap d 1 between the bifurcated branch portion 9 and the circulating air guide side 10 is formed to be larger than the gap d 2 between each exhaust manifold branch pipe 2 a and the circulating air guide wall 10.
【００１７】更にこの実施例では二又分岐部９に対して
機関本体１側に位置する裏側ヒートインシュレータ５上
には補助流通風排出口１１が形成される。図７に示され
るように第１の流通風取入口６から流入した走行風の一
部は矢印Ｘ4 で示されるように流通風案内壁１０により
案内されて二又分岐部９に沿い流れて補助流通風取入口
６から外部に排出される。この間、二又分岐部９は走行
風Ｘ4 によって冷却される。Further, in this embodiment, an auxiliary circulating air discharge port 11 is formed on the back side heat insulator 5 located on the engine body 1 side with respect to the bifurcated branch portion 9. As shown in FIG. 7, a part of the traveling wind that has flowed in from the first circulating air intake 6 is guided by the circulating air guide wall 10 and flows along the bifurcated branch portion 9 as shown by an arrow X 4. It is discharged from the auxiliary circulation air intake 6. During this time, the bifurcated portion 9 is cooled by the traveling wind X 4 .
【００１８】[0018]
【発明の効果】排気マニホルドが発する輻射熱を遮幣し
つつ排気マニホルド集合部の全外周面を一様に冷却する
ことができる。According to the present invention, it is possible to uniformly cool the entire outer peripheral surface of the exhaust manifold collecting portion while shielding the radiant heat generated by the exhaust manifold.
【図１】排気ヒートインシュレータの正面図である。FIG. 1 is a front view of an exhaust heat insulator.
【図２】裏側ヒートインシュレータの正面図である。FIG. 2 is a front view of a back side heat insulator.
【図３】排気ヒートインシュレータの側面図である。FIG. 3 is a side view of an exhaust heat insulator.
【図４】図１および図２のVI−VI線に沿ってみた排気ヒ
ートインシュレータの側面図である。FIG. 4 is a side view of the exhaust heat insulator taken along line VI-VI in FIGS. 1 and 2.
【図５】別の実施例を示す排気ヒートインシュレータの
正面図である。FIG. 5 is a front view of an exhaust heat insulator showing another embodiment.
【図６】図５に示す裏側ヒートインシュレータの正面図
である。6 is a front view of the back side heat insulator shown in FIG. 5. FIG.
【図７】図５および図６のVII −VII 線に沿ってみた排
気ヒートインシュレータの側面断面図である。FIG. 7 is a side sectional view of the exhaust heat insulator taken along the line VII-VII in FIGS. 5 and 6.
【図８】図７のVIII−VIII線に沿ってみた排気ヒートイ
ンシュレータの断面図である。8 is a cross-sectional view of the exhaust heat insulator taken along the line VIII-VIII of FIG.
２…排気マニホルド ３…排気ヒートインシュレータ ４…表側ヒートインシュレータ ５…裏側ヒートインシュレータ ６…第１の流通風取入口 ７…流通風排出口 ８ａ，８ｂ…第２の流通風取入口 2 ... Exhaust manifold 3 ... Exhaust heat insulator 4 ... Front side heat insulator 5 ... Back side heat insulator 6 ... First circulating air intake port 7 ... Circulating air discharge port 8a, 8b ... Second circulating air intake port
Claims (3)
れ方向に対して上流側に位置する排気マニホルド表面と
該流通風の流れ方向に対して下流側に位置する排気マニ
ホルド裏面とを覆う排気ヒートインシュレータにおい
て、排気ヒートインシュレータを排気マニホルドから間
隔を隔てて排気マニホルド表面および排気マニホルド両
側面を覆う表側ヒートインシュレータと、排気マニホル
ドから間隔を隔てて排気マニホルド裏面および排気マニ
ホルド両側面を覆う裏側ヒートインシュレータとにより
構成し、排気マニホルド表面を覆う表側ヒートインシュ
レータ部分に第１の流通風取入口を形成すると共に排気
マニホルド裏面を覆う裏側ヒートインシュレータ部分に
流通風排出口を形成し、更に排気マニホルド両側面を覆
う裏側ヒートインシュレータ部分に夫々流通風の流れ方
向上流に向けて開口する第２の流通風取入口を形成した
内燃機関の排気ヒートインシュレータ。1. Exhaust heat covering an exhaust manifold surface located upstream with respect to a flow direction of circulating air flowing in the engine room and an exhaust manifold rear surface located downstream with respect to the flowing direction of the circulating air. In the insulator, a front heat insulator that covers the exhaust heat insulator at a distance from the exhaust manifold to cover the exhaust manifold surface and both side surfaces of the exhaust manifold, and a back heat insulator that covers the exhaust manifold rear surface and both sides of the exhaust manifold at a distance from the exhaust manifold. And a first circulation air intake port is formed in the front heat insulator portion that covers the exhaust manifold surface, a circulation air discharge port is formed in the back heat insulator portion that covers the rear surface of the exhaust manifold, and both side surfaces of the exhaust manifold are further covered. Back side heat insulation An exhaust heat insulator for an internal combustion engine, wherein a second circulating air intake opening is formed in each of the vibrator portions, the second circulating air intake opening opening upstream in the flow direction of the circulating air.
和が上記第１の流通風取入口の開口面積の総和よりも大
きい請求項１に記載の内燃機関の排気ヒートインシュレ
ータ。2. The exhaust heat insulator for an internal combustion engine according to claim 1, wherein the sum of the opening areas of the second circulating air intake is larger than the sum of the opening areas of the first circulating air intake.
部から間隔を隔てつつ二又分岐部に沿って表側ヒートイ
ンシュレータから裏側ヒートインシュレータに向けて延
びる流通風案内壁を形成した請求項１に記載の内燃機関
の排気ヒートインシュレータ。3. A ventilation air guide wall is formed which extends from the front side heat insulator toward the back side heat insulator along the bifurcated branch while being spaced from the bifurcated branch of the adjacent exhaust manifold branch pipe. Exhaust heat insulator for an internal combustion engine as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23317194A JP3196523B2 (en) | 1994-09-28 | 1994-09-28 | Exhaust heat insulator for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23317194A JP3196523B2 (en) | 1994-09-28 | 1994-09-28 | Exhaust heat insulator for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0893470A true JPH0893470A (en) | 1996-04-09 |
| JP3196523B2 JP3196523B2 (en) | 2001-08-06 |
Family
ID=16950848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23317194A Expired - Fee Related JP3196523B2 (en) | 1994-09-28 | 1994-09-28 | Exhaust heat insulator for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3196523B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010001408A (en) * | 1999-06-04 | 2001-01-05 | 정몽규 | Exhaust manifold heat protector for internal combustion engine |
| KR100318070B1 (en) * | 1999-09-09 | 2001-12-22 | 이계안 | Exhaust manifold cover for decreasing noise |
| KR100372111B1 (en) * | 2000-12-15 | 2003-02-14 | 현대자동차주식회사 | Heat protector for exhaust manifold |
| JP2010014069A (en) * | 2008-07-04 | 2010-01-21 | Daihatsu Motor Co Ltd | Heat shielding cooling device for exhaust system |
| JP2013199880A (en) * | 2012-03-26 | 2013-10-03 | Kubota Corp | Multi-cylinder engine |
| JP2016160851A (en) * | 2015-03-03 | 2016-09-05 | トヨタ自動車株式会社 | Heat insulator |
| DE102017001876A1 (en) | 2016-03-14 | 2017-09-14 | Mazda Motor Corporation | Exhaust isolator structure for multi-cylinder engine |
| CN107816381A (en) * | 2017-10-26 | 2018-03-20 | 重庆长安汽车股份有限公司 | A kind of gas extraction system heat shield of engine with supercharger |
| WO2026045167A1 (en) * | 2024-08-26 | 2026-03-05 | 比亚迪股份有限公司 | Engine, power generation assembly, and vehicle |
-
1994
- 1994-09-28 JP JP23317194A patent/JP3196523B2/en not_active Expired - Fee Related
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010001408A (en) * | 1999-06-04 | 2001-01-05 | 정몽규 | Exhaust manifold heat protector for internal combustion engine |
| KR100318070B1 (en) * | 1999-09-09 | 2001-12-22 | 이계안 | Exhaust manifold cover for decreasing noise |
| KR100372111B1 (en) * | 2000-12-15 | 2003-02-14 | 현대자동차주식회사 | Heat protector for exhaust manifold |
| JP2010014069A (en) * | 2008-07-04 | 2010-01-21 | Daihatsu Motor Co Ltd | Heat shielding cooling device for exhaust system |
| JP2013199880A (en) * | 2012-03-26 | 2013-10-03 | Kubota Corp | Multi-cylinder engine |
| EP3064732A1 (en) * | 2015-03-03 | 2016-09-07 | Toyota Jidosha Kabushiki Kaisha | Heat insulator |
| JP2016160851A (en) * | 2015-03-03 | 2016-09-05 | トヨタ自動車株式会社 | Heat insulator |
| AU2016201400B2 (en) * | 2015-03-03 | 2017-06-08 | Kabushiki Kaisha Toyota Jidoshokki | Heat insulator |
| US10001049B2 (en) | 2015-03-03 | 2018-06-19 | Toyota Jidosha Kabushiki Kaisha | Heat insulator |
| DE102017001876A1 (en) | 2016-03-14 | 2017-09-14 | Mazda Motor Corporation | Exhaust isolator structure for multi-cylinder engine |
| JP2017165123A (en) * | 2016-03-14 | 2017-09-21 | マツダ株式会社 | Exhaust insulator structure for multi-cylinder engines |
| US10302003B2 (en) * | 2016-03-14 | 2019-05-28 | Mazda Motor Corporation | Exhaust insulator structure for multi-cylinder engine |
| CN107816381A (en) * | 2017-10-26 | 2018-03-20 | 重庆长安汽车股份有限公司 | A kind of gas extraction system heat shield of engine with supercharger |
| CN107816381B (en) * | 2017-10-26 | 2019-11-08 | 重庆长安汽车股份有限公司 | A kind of exhaust system heat shield of engine with supercharger |
| WO2026045167A1 (en) * | 2024-08-26 | 2026-03-05 | 比亚迪股份有限公司 | Engine, power generation assembly, and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3196523B2 (en) | 2001-08-06 |
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