JPH0341046Y2 - - Google Patents
Info
- Publication number
- JPH0341046Y2 JPH0341046Y2 JP6522487U JP6522487U JPH0341046Y2 JP H0341046 Y2 JPH0341046 Y2 JP H0341046Y2 JP 6522487 U JP6522487 U JP 6522487U JP 6522487 U JP6522487 U JP 6522487U JP H0341046 Y2 JPH0341046 Y2 JP H0341046Y2
- Authority
- JP
- Japan
- Prior art keywords
- pipe
- tube
- exhaust
- injection rate
- inner tube
- 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
Links
- 238000002347 injection Methods 0.000 claims description 12
- 239000007924 injection Substances 0.000 claims description 12
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Landscapes
- Exhaust Silencers (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Description
【考案の詳細な説明】
（産業上の利用分野）
本考案は、主として触媒による排気浄化を行う
エンジンに適用される排気管に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an exhaust pipe mainly applied to an engine that performs exhaust gas purification using a catalyst.
（従来の技術）
従来、実開昭50−111518号、特開昭51−99725
号、実開昭54−107726号により、排気管を、排気
通路を構成する内管とこれを囲繞する外管とから
成る２重管構造に構成し、内管内を流れる排気ガ
スの温度低下を抑制して、触媒での反応を促進
し、排気浄化率を向上させるようにしたものは知
られる。(Prior art) Previously, Utility Model Application Publication No. 111518/1983, Japanese Patent Application Publication No. 51-99725
According to Utility Model Application No. 54-107726, the exhaust pipe has a double-pipe structure consisting of an inner pipe constituting an exhaust passage and an outer pipe surrounding it, and the temperature of the exhaust gas flowing inside the inner pipe is reduced. It is known that the reaction is suppressed to promote the reaction in the catalyst and improve the exhaust purification rate.
（考案が解決しようとする問題点）
上記のものでは、内管と外管との間に空気層や
断熱材層を形成したり、内管と外管との間の空間
を真空化したりして、内管から外管への熱伝導を
抑制し、排気ガスの保温性を高めるようにしてい
るが、内管からの輻射による放熱に対しては特に
対策が構ぜられていない。(Problems to be solved by the invention) In the above method, an air layer or a heat insulating material layer is formed between the inner tube and the outer tube, or the space between the inner tube and the outer tube is evacuated. In this way, heat conduction from the inner tube to the outer tube is suppressed to improve heat retention of exhaust gas, but no particular measures are taken against heat dissipation due to radiation from the inner tube.
本考案は、内管からの輻射エネルギーの外管外
部への放出を抑制して、排気ガスの保温性を一層
高められるようにした排気管を提供することをそ
の目的とする。 An object of the present invention is to provide an exhaust pipe that suppresses the release of radiant energy from the inner pipe to the outside of the outer pipe and further improves the heat retention of exhaust gas.
（問題点を解決するための手段）
本考案は、上記目的を達成すべく、排気通路を
構成する内管と、該内管を囲繞する外管とから成
る２重管構造の排気管において、該外管の内表面
の射出率を該内管の外表面の射出率よりも小さく
したことを特徴とする。(Means for Solving the Problems) In order to achieve the above object, the present invention provides an exhaust pipe with a double pipe structure consisting of an inner pipe constituting an exhaust passage and an outer pipe surrounding the inner pipe. It is characterized in that the injection rate of the inner surface of the outer tube is smaller than the injection rate of the outer surface of the inner tube.
（作用）
単位面積・単位時間当りに物体から射出される
エネルギーを物体の射出能といい、これをＥと
し、物体と同一温度の黒体の射出能をEbとする
と、物体の射出率εは、
ε＝Ｅ／Eb
で表わされ、物体の入射エネルギーの吸収率をα
とすると、ε＝α（キルヒホツフの法則）となる。(Effect) The energy emitted from an object per unit area and unit time is called the ejection power of the object.If this is E, and the ejection power of a black body at the same temperature as the object is Eb, then the ejection rate ε of the object is , ε=E/Eb, and the absorption rate of the incident energy of the object is α
Then, ε=α (Kirchhoff's law).
ここで、内管外表面から射出される輻射エネル
ギーは、外管内表面で一部吸収されて残りは内管
側に反射され、内管外表面で吸収された残りが外
管側に再反射され、その繰返しにより輻射エネル
ギーは内管と外管とに順次吸収される。 Here, the radiant energy emitted from the outer surface of the inner tube is partially absorbed by the inner surface of the outer tube, the rest is reflected back to the inner tube, and the rest absorbed by the outer surface of the inner tube is re-reflected back to the outer tube. , by repeating this, the radiant energy is sequentially absorbed by the inner tube and the outer tube.
この場合、基本的には内管外表面の射出率を小
さくして、内管から射出される輻射エネルギーを
減少させるが、外管内表面の射出率を内管外表面
の射出率より更に小さくすれば、内管から射出さ
れる輻射エネルギーのうち外管で吸収されるエネ
ルギーの割合が減少し、輻射エネルギーの外管を
介しての外部への放出が抑制され、排気ガスの保
温性が一層向上する。 In this case, the radiation energy emitted from the inner tube is basically reduced by reducing the injection rate on the outer surface of the inner tube, but the injection rate on the inner surface of the outer tube can be made even smaller than that on the outer surface of the inner tube. For example, the ratio of energy absorbed by the outer pipe to the radiant energy emitted from the inner pipe is reduced, suppressing the release of radiant energy to the outside via the outer pipe, and further improving heat retention of exhaust gas. do.
（実施例）
図面は多気筒エンジンの排気管を構成する排気
マニホルドに本考案を適用した実施例を示し、図
中１はエンジンのシリンダヘツドに取付けられる
フランジであり、該フランジ１に複数の分岐管２
をその上流端において嵌着し、これら分岐管２の
下流端を集合チヤンバ３に接続して排気マニホル
ドを構成した。(Embodiment) The drawing shows an embodiment in which the present invention is applied to an exhaust manifold constituting the exhaust pipe of a multi-cylinder engine. tube 2
were fitted at their upstream ends, and the downstream ends of these branch pipes 2 were connected to the collection chamber 3 to form an exhaust manifold.
該各分岐管２は、排気通路を構成する内管４
と、該内管４を空〓を存して囲繞する外管５とか
ら成る２重管構造に構成されるものとし、この場
合内管４を、上記した実開昭54−107726号公報に
記載に従来技術の如く鋳物製とすると、面粗度が
荒くなつて射出率が大きくなるため、本実施例で
は内管４をSUS410等の金属パイプで構成し、内
管４の外表面４ａの射出率が例えば0.63程度にな
るようにし、又外管５も同様の金属パイプで構成
し、その内表面５ａにNi，Cr等の射出率の低い
金属メツキを施して、内表面５ａの射出率が例え
ば０，07程度になるようにした。 Each branch pipe 2 has an inner pipe 4 constituting an exhaust passage.
and an outer tube 5 which surrounds the inner tube 4 with an air space. If it is made of cast metal as in the prior art described, the surface roughness will become rough and the injection rate will increase. Therefore, in this embodiment, the inner tube 4 is made of a metal pipe such as SUS410, and the outer surface 4a of the inner tube 4 is made of metal. The injection rate is set to be, for example, about 0.63, and the outer tube 5 is also made of a similar metal pipe, and its inner surface 5a is plated with a metal with a low injection rate such as Ni or Cr, so that the injection rate of the inner surface 5a is set to about 0.63. For example, it is set to about 0.07.
尚、射出率は金属表面ど研磨することによつて
も小さくできるが、量産性を考慮すると上記の如
くメツキ処理で射出率を減少させた方が有利であ
る。 The injection rate can also be reduced by polishing the metal surface, but in consideration of mass production, it is more advantageous to reduce the injection rate by plating as described above.
以上の構成によれば、内管４の外表面４ａから
射出される輻射エネルギーが外管５の内表面５ａ
と内管４の外表面４ａとの間で反射吸収を繰返す
際、射出率の大きな外表面４ａでより大くのエネ
ルギーが吸収されて、内表面５ａで吸収されるエ
ネルギーの割合が減少し、従つて外管５を介して
の外部への輻射エネルギーの放出が抑制される。
その結果、内管４内を流れる排気ガスの保温性が
高められ、排気マニホルドの下流側の触媒に排気
ガスが高温のまま導入されて、触媒反応が促進さ
れ、排気浄化率が向上する。 According to the above configuration, the radiant energy emitted from the outer surface 4a of the inner tube 4 is transmitted to the inner surface 5a of the outer tube 5.
When reflection and absorption are repeated between the outer surface 4a of the inner tube 4, a larger amount of energy is absorbed by the outer surface 4a with a higher ejection rate, and the proportion of energy absorbed by the inner surface 5a decreases. Therefore, the release of radiant energy to the outside via the outer tube 5 is suppressed.
As a result, the heat retention of the exhaust gas flowing inside the inner pipe 4 is improved, the exhaust gas is introduced into the catalyst on the downstream side of the exhaust manifold at a high temperature, the catalytic reaction is promoted, and the exhaust gas purification rate is improved.
（考案の効果）
以上の如く本考案によるときは、内管からの輻
射エネルギーの外管外部への放出を抑制でき、輻
射による放熱を抑制して、排気ガスの保温性を向
上できる効果を有する。(Effects of the invention) As described above, the invention has the effect of suppressing the release of radiant energy from the inner pipe to the outside of the outer pipe, suppressing heat dissipation due to radiation, and improving heat retention of exhaust gas. .
第１図は本案実施の１例の部分截断正面図、第
２図はその部分截断側面図である。
４……内管、４ａ……外表面、５……外管、５
ａ……内表面。
FIG. 1 is a partially cutaway front view of one example of implementing the present invention, and FIG. 2 is a partially cutaway side view thereof. 4... Inner tube, 4a... Outer surface, 5... Outer tube, 5
a...Inner surface.
Claims (1)
外管とから成る２重管構造の排気管において、該
外管の内表面の射出率を該内管の外表面の射出率
よりも小さくしたことを特徴とするエンジンの排
気管。 In an exhaust pipe with a double pipe structure consisting of an inner pipe constituting an exhaust passage and an outer pipe surrounding the inner pipe, the injection rate of the inner surface of the outer pipe is higher than the injection rate of the outer surface of the inner pipe. An engine exhaust pipe characterized by its small size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6522487U JPH0341046Y2 (en) | 1987-05-01 | 1987-05-01 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6522487U JPH0341046Y2 (en) | 1987-05-01 | 1987-05-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63177613U JPS63177613U (en) | 1988-11-17 |
| JPH0341046Y2 true JPH0341046Y2 (en) | 1991-08-29 |
Family
ID=30902102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6522487U Expired JPH0341046Y2 (en) | 1987-05-01 | 1987-05-01 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0341046Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10578000B2 (en) | 2016-09-08 | 2020-03-03 | Toyota Jidosha Kabushiki Kaisha | Exhaust structure for internal combustion engine |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3521895B2 (en) | 2000-12-07 | 2004-04-26 | 日産自動車株式会社 | Exhaust manifold of internal combustion engine |
| JP5647478B2 (en) * | 2010-09-30 | 2014-12-24 | 積水化学工業株式会社 | Double piping structure and joint with suction port used in this structure |
-
1987
- 1987-05-01 JP JP6522487U patent/JPH0341046Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10578000B2 (en) | 2016-09-08 | 2020-03-03 | Toyota Jidosha Kabushiki Kaisha | Exhaust structure for internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63177613U (en) | 1988-11-17 |
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