JPS622134B2 - - Google Patents
Info
- Publication number
- JPS622134B2 JPS622134B2 JP13514381A JP13514381A JPS622134B2 JP S622134 B2 JPS622134 B2 JP S622134B2 JP 13514381 A JP13514381 A JP 13514381A JP 13514381 A JP13514381 A JP 13514381A JP S622134 B2 JPS622134 B2 JP S622134B2
- Authority
- JP
- Japan
- Prior art keywords
- heat shield
- small holes
- shield plate
- catalytic converter
- plate
- 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
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
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- 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
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
- F01N13/14—Exhaust or silencing apparatus characterised by constructional features having thermal insulation
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
- Exhaust Gas After Treatment (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
この発明は自動車の排気通路に設けられる触媒
コンバータの遮熱板に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a heat shield plate for a catalytic converter provided in an exhaust passage of an automobile.
従来の技術
従来の触媒コンバータの遮熱板として、例え
ば、第１図に示すようなもの（日産自動車(株)昭和
54年７月発行のスカイラインサービス月報386
号）がある。同図において、１は板金をプレス成
形した遮熱板本体で、これには水抜き孔２、この
遮熱板本体１をコンバータに取り付けるためのボ
ルト孔３および取付凹部４がそれぞれ形成されて
いる。Conventional technology As a heat shield plate for a conventional catalytic converter, for example, the one shown in Figure 1 (Nissan Motor Co., Ltd. Showa
Skyline Service Monthly Report 386 published in July 1954
No.). In the figure, reference numeral 1 denotes a heat shield body made of press-formed sheet metal, in which water drain holes 2, bolt holes 3 and mounting recesses 4 for attaching the heat shield body 1 to a converter are formed, respectively. .
かかる触媒コンバータの遮熱板は、単に遮熱作
用のみを有するもの、すなわち薄い板金に、水抜
きや枯草の接触防止を兼ねた水抜き孔を設けたも
のであり、何んら騒音を低減するような構成とは
なつていない。したがつて、エンジンの運転中の
振動や排気管の共振によつて、排気通路に設けた
上記触媒コンバータや、この触媒コンバータの外
周を被う遮熱板もまたその振動を受けて共振し、
これらが騒音源となつて外部に放射されるという
問題があつた。 The heat shield plate of such a catalytic converter has only a heat shielding effect, that is, it is a thin sheet metal with drainage holes provided to drain water and prevent contact with dry grass, and does not reduce noise in any way. The structure is not familiar. Therefore, due to vibrations during engine operation and resonance of the exhaust pipe, the catalytic converter installed in the exhaust passage and the heat shield plate covering the outer periphery of the catalytic converter also resonate due to the vibrations.
There was a problem that these became noise sources and were radiated to the outside.
問題点を解決するための手段
この発明は、上記従来の問題点に鑑み案出され
たもので、板金をプレス成形した遮熱板の下側に
多数の小孔を有する略矩形状の多孔部を形成し、
この多孔部の全面積に対する小孔の総開口面積の
孔面積率が７〜30％となるように小孔を形成する
と共に、この小孔を多孔部全体に均一分散して形
成したことを特徴としている。Means for Solving the Problems The present invention was devised in view of the above-mentioned conventional problems, and provides a substantially rectangular porous portion having a large number of small holes on the lower side of a heat shield plate formed by press-forming sheet metal. form,
The small pores are formed so that the pore area ratio of the total opening area of the small pores to the total area of the porous portion is 7 to 30%, and the small pores are uniformly distributed throughout the porous portion. It is said that
作 用
一般に触媒コンバータ付近から発生する車外騒
音は、遮熱板全体からの放射エネルギーに起因し
ており、この放射エネルギーＲは、放射効率η×
振動エネルギーＱの関係式から求められ、したが
つてたとえ振動エネルギーＱが同じでも放射効率
ηを小さくすれば放射（音波）エネルギーＲが小
さくなる。そして、上記放射効率ηは、遮熱板に
特定の小孔を形成することによつて減少すること
ができる。この発明は斯る原理に基づいて案出さ
れたもので、多孔部と小孔との関連を上記のよう
に構成することによつて、遮熱板の振動騒音を多
孔部で吸収すると共に、触媒コンバータから発生
する騒音を小孔が吸収するため、音波の放射効率
が小さくなる。この結果、触媒コンバータ付近か
ら発生する車外騒音が大幅に低減できるのであ
る。Effect Generally, external noise generated near the catalytic converter is caused by radiant energy from the entire heat shield plate, and this radiant energy R is calculated by the radiation efficiency η×
It is determined from the relational expression of vibration energy Q, and therefore, even if the vibration energy Q is the same, if the radiation efficiency η is decreased, the radiation (sound wave) energy R will be decreased. The radiation efficiency η can be reduced by forming specific small holes in the heat shield plate. This invention was devised based on such a principle, and by configuring the relationship between the porous portion and the small holes as described above, the vibration noise of the heat shield plate is absorbed by the porous portion, and Since the small holes absorb the noise generated from the catalytic converter, the radiation efficiency of sound waves is reduced. As a result, external noise generated near the catalytic converter can be significantly reduced.
実施例
以下に、本発明の実施例を図面について説明す
る。Embodiments Below, embodiments of the present invention will be described with reference to the drawings.
第２図はこの発明の遮熱板を分解して示したも
のである。１１は振動エネルギを吸収する多孔板
で、多数の小孔１１ａが穿設され、振動エネルギ
ーの吸収体として作用する。１２は板金をプレス
成形して得た遮熱板本体で、この本体１２中央部
に開口１３が設けられ、この開口１３周辺に前記
多孔板１１の周縁がスポツト溶接等により第３図
に示すように一体固着される。１４は取付ボルト
孔である。 FIG. 2 shows an exploded view of the heat shield plate of the present invention. Reference numeral 11 denotes a perforated plate for absorbing vibration energy, which is provided with a large number of small holes 11a and acts as a vibration energy absorber. Reference numeral 12 denotes a heat shield plate body obtained by press forming a sheet metal, and an opening 13 is provided in the center of the body 12, and the periphery of the perforated plate 11 is welded around the opening 13 by spot welding or the like as shown in FIG. is integrally fixed to. 14 is a mounting bolt hole.
また、多孔板１１および遮熱板本体１２はアル
ミメツキ鋼板や亜鉛メツキ鋼板等で形成され、多
孔板１１の面積は遮熱板本体１２の投影面積の22
％前後となつており多孔板１１には直径１〜４ミ
リまたはそれ相当の開孔面積をもつた小孔１１ａ
が、例えば、第４図に拡大して示すように開孔ピ
ツチＰが１〜10ミリ程度、最も近接する３個の小
孔１１ａを結ぶ直線が作る角度θが30〜180゜の
範囲に選定される。すなわち、これによつて、小
孔１１ａが、多孔板１１全体に均一分散され形成
されるようになつている。 Further, the perforated plate 11 and the heat shield body 12 are formed of an aluminized steel plate, a galvanized steel plate, etc., and the area of the perforated plate 11 is 22 of the projected area of the heat shield body 12.
%, and the perforated plate 11 has small holes 11a with a diameter of 1 to 4 mm or an equivalent opening area.
However, for example, as shown in an enlarged view in Fig. 4, the hole pitch P is selected to be about 1 to 10 mm, and the angle θ formed by the straight line connecting the three closest small holes 11a is in the range of 30 to 180 degrees. be done. That is, as a result of this, the small holes 11a are uniformly distributed and formed throughout the perforated plate 11.
なお、１５は取付しろである。また、多孔板１
１は２枚以上重ね合せて、前記開口１３に取り付
けられる場合もある。 In addition, 15 is a mounting clearance. In addition, perforated plate 1
1 may be attached to the opening 13 by stacking two or more sheets.
次に、作用について説明する。 Next, the effect will be explained.
車体あるいは排気系チユーブなどからの振動が
取付ボルト孔１４などの取付部を介して触媒コン
バータの遮熱板本体１２に入力する。その振動エ
ネルギーＱは多孔板１１に加わる振動エネルギー
Q1と、遮熱板本体１２に加わる振動エネルギー
Q2との和になる（Ｑ＝Q1＋Q2）。 Vibrations from the vehicle body, exhaust system tube, etc. are input to the heat shield body 12 of the catalytic converter through mounting portions such as mounting bolt holes 14. The vibration energy Q is the vibration energy applied to the perforated plate 11.
Q 1 and the vibration energy applied to the heat shield body 12
It becomes the sum with Q 2 (Q = Q 1 + Q 2 ).
車外騒音は遮熱板本体の放射エネルギーであ
り、放射エネルギをＲとすると、Ｒ＝η・Ｑとな
る。ここで、ηは放射効率、Ｑは振動エネルギー
である。したがつて、Ｒ＝R1＋R2＝η1Q1＋η
2Q2となる（添数１は多孔板を、２は遮熱板本体
を表わす）。 The noise outside the vehicle is the radiant energy of the heat shield body, and if the radiant energy is R, then R=η·Q. Here, η is radiation efficiency and Q is vibration energy. Therefore, R=R 1 +R 2 =η 1 Q 1 +η
2 Q 2 (the subscript 1 represents the perforated plate and 2 represents the heat shield body).
ところが、多孔板１１は、吸音効率が高く放射
効率ηが小さくなるため、従来タイプの多孔板１
１を有しない遮熱板本体と比べ、外部入力による
振動エネルギーＱが同じでも、放射エネルギーＲ
は著しく小さくなる。 However, since the perforated plate 11 has a high sound absorption efficiency and a small radiation efficiency η, the perforated plate 1 of the conventional type
Compared to the heat shield body without 1, even if the vibration energy Q due to external input is the same, the radiant energy R
becomes significantly smaller.
また、この実施例では多孔板１１が、遮熱板本
体１２と別体に形成するものを示したが、これら
は一体でもよく、要するに多孔板１１（多孔部）
に対する小孔１１ａの数や大きさを選定すること
により、触媒コンバータや遮熱板から出る騒音の
低減が図れるのである。 Further, in this embodiment, the perforated plate 11 is formed separately from the heat shield main body 12, but they may be integrated.In short, the perforated plate 11 (porous portion)
By selecting the number and size of the small holes 11a relative to each other, it is possible to reduce the noise emitted from the catalytic converter and the heat shield plate.
第５図は本発明の他の実施例を示すものであ
る。これは振動エネルギー吸収部として、薄い多
孔板１１を用いる代わりに、メツシユの細かいス
テンレス製の金網１６を取付けたものであり、こ
のように金網１６を用いたものでも同様に振動騒
音の放射を低減することができる。尚、この実施
例の小孔も上記第１実施例と同様な構成である。 FIG. 5 shows another embodiment of the invention. Instead of using a thin perforated plate 11 as a vibration energy absorbing part, a fine mesh stainless steel wire mesh 16 is attached, and even if the wire mesh 16 is used in this way, the radiation of vibration noise can be reduced as well. can do. Incidentally, the small hole in this embodiment also has the same structure as in the first embodiment.
第６図及び第７図は第３図に示す遮熱板におい
て、孔面積率（（小孔の総開口面積／多孔板の全
面積）×100％）に対する遮音効果dB及び遮熱効
果の関係を実験から求めた特性グラフで、小孔１
１ａの径が１ミリ、２ミリ、３ミリ、４ミリおよ
び５ミリの各場合について、孔面積率が７％以上
30％以下において遮音効果がすぐれることがわか
り、遮熱効果も孔面積率が30％以下ですぐれるこ
とが確められている。尚、第６図・第７図におけ
る測定条件（例えば遮熱板の鉄板厚1.5mmなど）
は第１図の従来公知のものと同じである。 Figures 6 and 7 show the relationship between the sound insulation effect dB and the heat insulation effect with respect to the pore area ratio ((total opening area of small holes/total area of perforated plate) x 100%) in the heat shield plate shown in Figure 3. is a characteristic graph obtained from experiments, and small hole 1
The pore area ratio is 7% or more when the diameter of 1a is 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm.
It has been found that the sound insulation effect is excellent when the pore area ratio is 30% or less, and it has been confirmed that the heat insulation effect is also excellent when the pore area ratio is 30% or less. In addition, the measurement conditions in Figures 6 and 7 (for example, the thickness of the iron plate of the heat shield plate is 1.5 mm)
is the same as the conventionally known one shown in FIG.
発明の効果
以上の説明で明らかなように、この発明によれ
ば、板金をプレス成形した遮熱板に多数の小孔を
有する多孔部を形成し、この多孔部の全面積に対
する小孔の総開口面積の孔面積率が７〜30％とな
るように小孔を形成すると共に、この小孔を多孔
部全体に均一分散して形成したことにより、遮熱
板から放射される振動騒音を多孔部が吸収すると
共に、触媒コンバータから発生する騒音が小孔か
ら吸収されるため、触媒コンバータ付近から放射
される車外騒音を大幅に低減できる。Effects of the Invention As is clear from the above description, according to the present invention, a porous portion having a large number of small holes is formed in a heat shield plate formed by press-forming a sheet metal, and the total number of small holes relative to the total area of the porous portion is By forming small pores so that the pore area ratio of the opening area is 7 to 30%, and by uniformly distributing the small pores throughout the pore area, the vibration noise radiated from the heat shield plate is absorbed by the pores. Since the noise generated from the catalytic converter is also absorbed through the small holes, external noise emitted from the vicinity of the catalytic converter can be significantly reduced.
また、遮熱板に多数の小孔を有する多孔部を形
成するので、重量の軽減が図れると共に、遮熱効
果も十分得られる。 Furthermore, since the heat shield plate is formed with a porous portion having a large number of small holes, the weight can be reduced and a sufficient heat shielding effect can be obtained.
尚、小孔が、多孔部全体に均一分散して形成さ
れるため、騒音低減が効果的に行なわれる。 Incidentally, since the small holes are formed in a uniformly distributed manner throughout the porous portion, noise reduction is effectively performed.
第１図は従来の触媒コンバータの遮熱板、第２
図は本発明の遮熱板の分解斜視図、第３図は同じ
く組付後の斜視図、第４図は多孔板の平面図、第
５図は他の実施例を示す斜視図、第６図及び第７
図は多孔板の孔面積率に対する防音効果と遮熱効
果特性を示すグラフである。
１１……多孔板（多孔部）、１１ａ……小孔、
１２……遮熱板本体、１３……開口、１６……金
網（多孔部）。
Figure 1 shows the heat shield plate of a conventional catalytic converter,
The figure is an exploded perspective view of the heat shield plate of the present invention, FIG. 3 is a perspective view after assembly, FIG. 4 is a plan view of the perforated plate, FIG. 5 is a perspective view showing another embodiment, and FIG. Figure and 7th
The figure is a graph showing the sound insulation effect and heat insulation effect characteristics with respect to the pore area ratio of a perforated plate. 11... Perforated plate (porous part), 11a... Small hole,
12... Heat shield body, 13... Opening, 16... Wire mesh (porous portion).
Claims (1)
コンバータの遮熱板において、板金をプレス成形
した遮熱板に多数の小孔を有する多孔部を形成
し、この多孔部の全面積に対する小孔の総開口面
積の孔面積率が７〜30％となるように小孔を形成
すると共に、この小孔を多孔部全体に均一分散し
て形成したことを特徴とする触媒コンバータの遮
熱板。1. In the heat shield plate of a catalytic converter connected to the exhaust system of an automobile engine, a porous part having a large number of small holes is formed in the heat shield plate which is press-formed from sheet metal, and the number of small holes is calculated based on the total area of the porous part. A heat shield plate for a catalytic converter, characterized in that small holes are formed so that the pore area ratio of the total opening area is 7 to 30%, and the small holes are uniformly distributed throughout the porous portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13514381A JPS5838313A (en) | 1981-08-28 | 1981-08-28 | Heat shielding panel for catalyst converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13514381A JPS5838313A (en) | 1981-08-28 | 1981-08-28 | Heat shielding panel for catalyst converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5838313A JPS5838313A (en) | 1983-03-05 |
| JPS622134B2 true JPS622134B2 (en) | 1987-01-17 |
Family
ID=15144806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13514381A Granted JPS5838313A (en) | 1981-08-28 | 1981-08-28 | Heat shielding panel for catalyst converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5838313A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6125830B2 (en) * | 2012-12-26 | 2017-05-10 | 三井造船株式会社 | How to install the equipment |
| CN108894858A (en) * | 2018-06-21 | 2018-11-27 | 浙江吉利控股集团有限公司 | The ternary catalystic device structure of integrated heat-insulation window |
-
1981
- 1981-08-28 JP JP13514381A patent/JPS5838313A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5838313A (en) | 1983-03-05 |
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