JPH02245414A - Muffler for automobile - Google Patents

Muffler for automobile

Info

Publication number
JPH02245414A
JPH02245414A JP6379189A JP6379189A JPH02245414A JP H02245414 A JPH02245414 A JP H02245414A JP 6379189 A JP6379189 A JP 6379189A JP 6379189 A JP6379189 A JP 6379189A JP H02245414 A JPH02245414 A JP H02245414A
Authority
JP
Japan
Prior art keywords
exhaust gas
muffler
gas passage
pipe
stainless
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.)
Pending
Application number
JP6379189A
Other languages
Japanese (ja)
Inventor
Kazutoshi Ito
和俊 伊藤
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.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors 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 Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Priority to JP6379189A priority Critical patent/JPH02245414A/en
Publication of JPH02245414A publication Critical patent/JPH02245414A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/16Selection of particular materials
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • F01N1/24Silencing apparatus characterised by method of silencing by using sound-absorbing materials

Abstract

PURPOSE:To contrive the simplification of structure, reduction in back pressure, and securement of muffling effect by making up a muffler of a muffler body consisting of heavy wall formed body having heat resistance and corrosion resistance and of an exhaust gas passage provided crookedly in the inside of the muffler body. CONSTITUTION:A muffler body 11 is formed by a sintered alloy or a foamed body 12 of ceramics. And the foamed body 12 is formed by dividing a prismatic body of elliptical section into two parts in the long-radius direction, and in the divided surface thereof, an exhaust gas passage 14 is provided. And the exhaust gas passage 14 is formed, for example, into a circular shape in section, and also the entire shape is bent in the S-shaped. Further, at both end parts of the exhaust gas passage 14, straight parts 15a, 15b are formed respectively, and stainless piped 16, 17 are inserted into both these end parts respectively. And the stainless pipe 16 on one side is connected to an engine via a center pipe 19, and also the stainless pipe 17 on the other side is opened to the atmosphere via a tail pipe 20.

Description

【発明の詳細な説明】 〔発明の目的〕 (産業上の利用分野) この発明は、エンジンの排気バイブに途中に設けられる
自動車用マフラに関する。
DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a muffler for an automobile that is installed in the middle of an exhaust vibrator of an engine.

(従来の技術) エンジンから吐出される排気ガスが持っている音響のエ
ネルギを減衰させるためのマフラは、共鳴型と膨張型の
2種類に大別されるが、これらを組合わせたものがほと
んどである。第3図は従来の一般的なメインマフラであ
り、円筒状つマフラ本体1の端部および内部には仕切り
板2・・・が設けられ、膨張室3および圧縮室4を形成
している。
(Prior art) Mufflers used to attenuate the acoustic energy of exhaust gas discharged from an engine are broadly divided into two types: resonance type and expansion type, but most mufflers are a combination of these types. It is. FIG. 3 shows a conventional main muffler, in which partition plates 2 are provided at the end and inside of a cylindrical muffler body 1, forming an expansion chamber 3 and a compression chamber 4.

そして、膨張室3はセンタパイプ5に接続され、圧縮室
4はテールバイブロに接続されている。
The expansion chamber 3 is connected to the center pipe 5, and the compression chamber 4 is connected to the tail vibro.

ところで、前記マフラを構成するマフラ本体1、仕切り
板2・・・およびバイブ5.6は通常、Alメツキ鋼板
によって製作されているが、最近では三元触媒の採用に
より、凝縮水がアルカリ性のために腐蝕性が強く、Aj
7メツキ鋼板製のマフラは腐蝕しやすいという問題があ
る。
By the way, the muffler main body 1, partition plate 2... and vibrator 5.6 that constitute the muffler are usually made of Al-plated steel plates, but recently with the adoption of a three-way catalyst, the condensed water is alkaline. It is highly corrosive, and Aj
Mufflers made of 7-plated steel plates have the problem of being susceptible to corrosion.

そこで、耐蝕性と加工性の優れたステンレス鋼板によっ
てマフラを製作することが行われているが、ステンレス
鋼板は高価であり、脈動波を膨張・圧縮して消音させる
ためには複雑に構成する必要があり、コストアップの原
因となっている。
Therefore, mufflers are manufactured using stainless steel plates, which have excellent corrosion resistance and workability, but stainless steel plates are expensive, and they need to be constructed in a complicated manner in order to expand and compress the pulsating waves and muffle them. This causes an increase in costs.

(発明が解決しようとする課題) 前述のように、従来のようにマフラは、構造的に複雑で
あるため、抵抗となってエンジン出力が低下する。さら
に、耐蝕性と加工性の優れたステンレス鋼板を使用する
と、材料費′が高価でコストアップの原因となるという
問題がある。
(Problems to be Solved by the Invention) As described above, the conventional muffler is structurally complex, which creates resistance and reduces engine output. Furthermore, if a stainless steel plate with excellent corrosion resistance and workability is used, there is a problem in that the material cost is high and causes an increase in cost.

この発明は前記事情に着目してなされたもので、その目
的とするところは、簡単な構造で、排圧を少なくすると
ともに、消音効果があり、しかも耐蝕性に優れた自動車
用マフラを提供することにある。
This invention was made in view of the above-mentioned circumstances, and its purpose is to provide an automobile muffler that has a simple structure, reduces exhaust pressure, has a silencing effect, and has excellent corrosion resistance. There is a particular thing.

[発明の構成コ (課題を解決するための手段および作用)この発明は、
前記目的を達成するために、耐熱および耐蝕性材料によ
って成形された厚肉の発泡体からなるマフラ本体と、こ
のマフラ本体の内部に屈曲しp設けられた排気ガス通路
とからマフラ本体を構成する。
[Configuration of the invention (means and action for solving the problem) This invention is
In order to achieve the above object, the muffler body is composed of a muffler body made of a thick foam molded from a heat-resistant and corrosion-resistant material, and an exhaust gas passage that is bent inside the muffler body. .

そして、前記排気ガス通路の一端をセンタパイプに、他
端をテールバイブに接続し、排気ガスが排気ガス通路を
通過中に、発泡体の吸音作用によって消音されるように
したことにある。
One end of the exhaust gas passage is connected to the center pipe, and the other end is connected to the tail vibe, so that while the exhaust gas is passing through the exhaust gas passage, the sound is muffled by the sound absorbing effect of the foam.

(実施例) 以下、この発明の一実施例を図面に基づいて説明する。(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

第1図および第2図において、11はマフラ本体であり
、これは焼結合金またはセラミックの発泡体12によっ
て形成されている。すなわち、発泡体12は断面が楕円
形状の柱状体を、その長径方向に2分割することによっ
て形成され、分割面13には排気ガス通路14が設けら
れている。この排気ガス通路14は、たとえば断面が円
形で、S字状に屈曲しており、この排気ガス通路14の
一端開口部14aはマフラ本体11の一端面に、他端開
口部14bは他端面に開口している。そして、前記排気
ガス通路14の一端側および他端側はストレートに形成
され、このストレート部15as 15bにはステンレ
スバイブ16.17が挿入されている。これらステンレ
スバイブ16.17の前記排気ガス通路14に挿入され
ている部分の外周面には多数の通気穴16a・・・ 1
7a・・・が穿設されており、排気ガスが通気穴16a
117aを通過して発泡体12の内部に侵入するように
なっている。
In FIGS. 1 and 2, reference numeral 11 denotes a muffler body, which is formed of a sintered alloy or ceramic foam 12. That is, the foamed body 12 is formed by dividing a columnar body having an elliptical cross section into two parts in the major axis direction, and the dividing surface 13 is provided with an exhaust gas passage 14. This exhaust gas passage 14 has a circular cross section, for example, and is bent in an S-shape. One end opening 14a of this exhaust gas passage 14 is connected to one end surface of the muffler body 11, and the other end opening 14b is connected to the other end surface. It's open. One end and the other end of the exhaust gas passage 14 are formed straight, and stainless steel vibrators 16 and 17 are inserted into the straight parts 15as and 15b. A large number of ventilation holes 16a... 1 are provided on the outer peripheral surface of the portion of the stainless steel vibrator 16, 17 that is inserted into the exhaust gas passage 14.
7a... is drilled, and the exhaust gas flows through the ventilation hole 16a.
117a and enters the inside of the foam 12.

また、前記発泡体12は、その外周がステンレス製で、
内面に塗装を施したケース18によって覆われており、
前記ステンレスバイブ16はセンタパイプ19を介して
エンジン(図示しない)に連通し、ステンレスバイブ1
7はテールバイブ20を介して大気に開口している。
Further, the outer periphery of the foam 12 is made of stainless steel,
It is covered by a case 18 whose inner surface is painted,
The stainless steel vibe 16 communicates with an engine (not shown) via a center pipe 19, and the stainless steel vibe 1
7 is open to the atmosphere via the tail vibe 20.

また、前記発泡体12は、粉末合金またはセラミックス
(アルミナ等)と約2龍φの消失材料、たとえばプラス
チックまたは木粉等を混合し、金型に充填して成形する
The foam 12 is formed by mixing a powder alloy or ceramics (alumina, etc.) with about 2 φ of a dissipative material, such as plastic or wood powder, and filling the mixture into a mold.

ここで、粉末合金の場合には700’Cで仮焼きすると
、多孔質の焼結合金ができるため、これを約1000”
Cで本焼きすると、消失材料は炭酸ガスと水蒸気となり
、完全に消失して多孔質の発泡体となる。
In the case of a powder alloy, if it is calcined at 700'C, a porous sintered alloy will be created, so it should be heated to about 1000"
When the material is fired at C, the disappearing material becomes carbon dioxide gas and water vapor, and completely disappears to form a porous foam.

セラミックスの場合は、水を加えて成形する。自然放置
すると硬く乾燥するため、これを1500〜1800°
Cで本焼きすると、消失材料は前述と同様に炭酸ガスと
水蒸気となり、完全に消失して多孔質の発泡体となる。
In the case of ceramics, water is added and molded. If left naturally, it will become hard and dry, so heat it to 1500-1800°.
When the final firing is performed at C, the vanishing material becomes carbon dioxide gas and water vapor, as described above, and completely vanishes to form a porous foam.

なお、前記消失材料の代わりに炭酸ガスなどを発生する
発泡材を混合して金型の中で発泡させてもよい。
Note that instead of the vanishing material, a foaming material that generates carbon dioxide gas or the like may be mixed and foamed in the mold.

また、セラミックスと水または粉末合金と粘性材料、た
とえば塗料を撹拌槽に入れて撹拌したのち、これを金型
に充填する。つぎに、前述と同様に自然放置すると硬く
乾燥するため、これを1500〜1800°Cで本焼き
すると、水または粘性材料は水蒸気となり、完全に消失
して多孔質の発泡体となる。
Further, ceramics, water or a powder alloy, and a viscous material such as paint are placed in a stirring tank and stirred, and then filled into a mold. Next, as described above, if left naturally, it will become hard and dry, so when this is fired at 1500 to 1800°C, the water or viscous material turns into steam and completely disappears, forming a porous foam.

このようにして得られた発泡体12からなるマフラによ
れば、エンジンから排気される排気ガスがセンタパイプ
10を介してマフラ本体11の排気ガス通路14に挿入
されたステンレスバイブ16.17に導かれる。ステン
レスバイブ16.17には多数の通気穴16a・・・ 
17a・・・が設けられているため、排気ガスはこれら
通気穴16a117aを通過して発泡体12の気泡に侵
入する。
According to the muffler made of the foam 12 thus obtained, exhaust gas exhausted from the engine is guided to the stainless steel vibrator 16.17 inserted into the exhaust gas passage 14 of the muffler body 11 via the center pipe 10. It will be destroyed. The stainless steel vibe 16.17 has many ventilation holes 16a...
17a... are provided, the exhaust gas passes through these ventilation holes 16a and 117a and enters the cells of the foam 12.

つまり、エンジンから排気された排気ガスの大きな脈動
波は膨張・圧縮を繰返して徐々に減衰されて消音される
ことになる。また、排気ガスはストレートの排気ガス通
路14を通過するために、排圧が少なくなり、また発生
する凝縮水がアルカリ性であっても、発泡体12自体が
耐蝕性を有するために、ケース18は比較的安価な材料
の鋼板でも十分に耐久性が得られる。
In other words, the large pulsating waves of the exhaust gas exhausted from the engine are gradually attenuated and muffled through repeated expansion and compression. Furthermore, since the exhaust gas passes through the straight exhaust gas passage 14, the exhaust pressure is reduced, and even if the generated condensed water is alkaline, the foam 12 itself has corrosion resistance, so the case 18 Sufficient durability can be obtained even with steel plate, which is a relatively inexpensive material.

なお、特定の周波数を減衰させるためには、前記排気ガ
ス通路14の途中で、しか・も排気ガスの流通方向に向
かって開口する共鳴室を設けてもよい。
In order to attenuate a specific frequency, a resonance chamber may be provided in the middle of the exhaust gas passage 14 and open toward the exhaust gas flow direction.

また、前記一実施例においては、排気ガス通路14の両
端部のストレート部にステンレスバイブ16.17を挿
入し、二〇周壁に通気穴16a117aを設けたが、ス
テンレスバイブ16.17は必ずしも必要とせず、排気
ガス通路14の一端にセンタパイプ19を接続し、他端
にテールバイブ20を接続してもよい。
Furthermore, in the above embodiment, the stainless steel vibrator 16.17 was inserted into the straight portions at both ends of the exhaust gas passage 14, and the ventilation holes 16a and 117a were provided in the circumferential wall, but the stainless steel vibrator 16.17 is not necessarily required. First, the center pipe 19 may be connected to one end of the exhaust gas passage 14, and the tail vibe 20 may be connected to the other end.

〔発明の効果〕〔Effect of the invention〕

以上説明したように、この発明によれば、耐熱および耐
蝕性材料によって成形された厚肉の発泡体からなるマフ
ラ本体と、このマフラ本体の内部に屈曲して設けられた
排気ガス通路とからマフラを構成したから、簡単な構造
で、排圧を少なくするとともに、発泡体によって消音効
果があり、しかも耐蝕性に優れた自動車用マフラを提供
することができる。
As explained above, according to the present invention, the muffler is connected to the muffler main body made of a thick foam molded from a heat-resistant and corrosion-resistant material, and the exhaust gas passage bent inside the muffler main body. With this configuration, it is possible to provide a muffler for an automobile that has a simple structure, reduces exhaust pressure, has a noise-muffling effect due to the foam, and has excellent corrosion resistance.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明の一実施例を示す自動車用マフラの縦
断側面図、第2図は第1図の■−■線に沿う断面図、第
3図は従来の自動車用マフラの縦断側面図である。 11・・・マフラ本体、12・・・発泡体、14・・・
排気ガス通路。 出願人代理人 弁理士 鈴江武彦
Fig. 1 is a longitudinal sectional side view of an automobile muffler showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a longitudinal sectional side view of a conventional automobile muffler. It is. 11...Muffler body, 12...Foam, 14...
exhaust gas passage. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

【特許請求の範囲】[Claims] 耐熱および耐蝕性材料によって成形された厚肉の発泡体
からなるマフラ本体と、このマフラ本体の内部に屈曲し
て設けられた排気ガス通路とからなり、前記排気ガス通
路の一端をセンタパイプに、他端をテールパイプに接続
したことを特徴とする自動車用マフラ。
It consists of a muffler body made of a thick foam molded from a heat-resistant and corrosion-resistant material, and an exhaust gas passage bent inside the muffler body, with one end of the exhaust gas passage serving as a center pipe. An automobile muffler characterized in that the other end is connected to a tail pipe.
JP6379189A 1989-03-17 1989-03-17 Muffler for automobile Pending JPH02245414A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6379189A JPH02245414A (en) 1989-03-17 1989-03-17 Muffler for automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6379189A JPH02245414A (en) 1989-03-17 1989-03-17 Muffler for automobile

Publications (1)

Publication Number Publication Date
JPH02245414A true JPH02245414A (en) 1990-10-01

Family

ID=13239556

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6379189A Pending JPH02245414A (en) 1989-03-17 1989-03-17 Muffler for automobile

Country Status (1)

Country Link
JP (1) JPH02245414A (en)

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