JP3452304B2 - Muffler outer cylinder structure - Google Patents
Muffler outer cylinder structureInfo
- Publication number
- JP3452304B2 JP3452304B2 JP02630598A JP2630598A JP3452304B2 JP 3452304 B2 JP3452304 B2 JP 3452304B2 JP 02630598 A JP02630598 A JP 02630598A JP 2630598 A JP2630598 A JP 2630598A JP 3452304 B2 JP3452304 B2 JP 3452304B2
- Authority
- JP
- Japan
- Prior art keywords
- outer cylinder
- muffler
- longitudinal direction
- lock seam
- seam portion
- 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
Links
Landscapes
- Exhaust Silencers (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、エンジンの排気音
を消音するためのマフラ外筒構造に関するものである。
【０００２】
【従来の技術】エンジンの排気音を消音するためのマフ
ラの外筒は金属プレートを円筒状にベンディングして円
筒の長手方向の合わせ部を接合している。この円筒の長
手方向の合せ部の接合としては図３で示すように、外筒
２の長手方向に沿ってシーム溶接９し、外筒２の両端に
端板３，４を固着して端板３側には排気ガス取り入れ口
５を、また、端板４側には排気ガス出口６を形成してマ
フラ本体１とした構造のものや、図４で示すように、金
属プレートの両端縁をヘミング加工（はぜ折り）し、こ
れを円筒状にベンディングして外筒２の長手方向にヘミ
ング接合したロックシーム部７を設け、外筒２の両端に
端板３，４を固着して端板３側には排気ガス取り入れ口
５を、また、端板４側には排気ガス出口を形成してマフ
ラ本体１とした構造のものが一般的である。
【０００３】
【発明が解決しようとする課題】しかしながら、マフラ
本体１内における排気ガスの圧力は高圧であり、この高
い内圧や振動等によって上記従来のシーム溶接９による
接合あるいはヘミング接合したロックシーム部のいずれ
においても気密性が十分保たれずガス洩れが懸念されて
いた。
【０００４】本発明の目的は、簡単な構成により気密性
を向上させたマフラ外筒構造を提供することである。
【０００５】
【課題を解決するための手段】上記の目的を達成するた
めの本発明の構成は、円筒の長手方向の合わせ部をヘミ
ング接合したロックシーム部を有するマフラの外筒にお
いて、前記ロックシーム部に、その長手方向の全長に渡
って連続した凹溝を押圧形成したものである。
【０００６】
【発明の実施の形態】以下本発明の実施の形態を図面に
基づいて説明する。図１において、１はマフラ本体、２
は外筒である。この外筒２の両端に端板３，４が固着さ
れ、端板３側には排気ガス取り入れ口５を、また、端板
４側には排気ガス出口６を形成している。
【０００７】本発明の外筒２は図２で示すように、金属
プレートの両端縁にヘミング７ａ，７ｂ（はぜ折り）を
加工し、これを円筒状にベンディングして外筒２の長手
方向の合せ部を前記ヘミング７ａ，７ｂにより嵌め合わ
せ圧着したヘミング接合でロックシーム部７を設けてい
るものである。
【０００８】そこで、本発明は前記ロックシーム部７
に、その長手方向の全長に渡って連続した凹溝８を押圧
形成したものである。
【０００９】この凹溝８の押圧形成は、ロックシーム部
７の領域内で１本乃至複数本でもよいし、外筒２の外側
表面又は内側表面のいずれでもよい。
【００１０】本発明は上記の通りの構造であるから、外
筒２の長手方向のロックシーム部７のヘミング７ａ，７
ｂは凹溝８の押圧形成によって密着力がより高められる
と共に、凹溝８の押圧形成によるヘミング７ａ，７ｂは
波形屈曲して通気抵抗の作用を行い、内圧に対しロック
シーム部７の気密性が確保される。
【００１１】その結果、外筒２の長手方向のロックシー
ム部７からのガス洩れの恐れを低減することができる。
【００１２】また、凹溝８の押圧形成によってロックシ
ーム部７のヘミング７ａ，７ｂの嵌め合わせの強度が増
大し、振動等によるヘミング７ａ，７ｂの嵌め合わせの
ズレや緩みが防止され、外筒２の正常な形態を維持する
と共に、気密性を向上させることができる。
【００１４】
【発明の効果】以上述べたように本発明によると、外筒
のロックシーム部の長手方向の全長に渡って連続した凹
溝を押圧成形してヘミングの嵌め合わせ部を密着する簡
単な構造によってマフラ内部の気密性を向上する利点を
有している。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler outer cylinder structure for suppressing exhaust noise of an engine. 2. Description of the Related Art An outer cylinder of a muffler for silencing an exhaust sound of an engine is formed by bending a metal plate into a cylindrical shape and joining a joining portion in a longitudinal direction of the cylinder. As shown in FIG. 3, seam welding 9 is performed along the longitudinal direction of the outer cylinder 2 and end plates 3 and 4 are fixed to both ends of the outer cylinder 2 to join the mating portions in the longitudinal direction of the cylinder. An exhaust gas inlet 5 is formed on the side 3, an exhaust gas outlet 6 is formed on the end plate 4 side to form the muffler main body 1, or as shown in FIG. A hemming process (bent fold) is performed, and this is bent into a cylindrical shape to provide a lock seam portion 7 which is hemmed in the longitudinal direction of the outer cylinder 2. The muffler body 1 generally has an exhaust gas inlet 5 on the plate 3 side and an exhaust gas outlet on the end plate 4 side. However, the pressure of the exhaust gas in the muffler main body 1 is high, and the lock seam portion joined by the conventional seam welding 9 or hemmed by the high internal pressure, vibration, or the like. In either case, the airtightness was not sufficiently maintained, and gas leakage was a concern. An object of the present invention is to provide a muffler outer cylinder structure having a simple structure and improved airtightness. [0005] To achieve the above object, the present invention provides a muffler outer cylinder having a lock seam portion formed by hemming a joining portion in a longitudinal direction of a cylinder. Over the entire length of the seam
Thus, a continuous concave groove is formed by pressing. Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a muffler body, 2
Is an outer cylinder. End plates 3 and 4 are fixed to both ends of the outer cylinder 2. An exhaust gas intake port 5 is formed on the end plate 3 side, and an exhaust gas outlet 6 is formed on the end plate 4 side. As shown in FIG. 2, the outer cylinder 2 of the present invention has hemmings 7a and 7b (bent folds) formed on both ends of a metal plate, and bends them into a cylindrical shape so as to extend in the longitudinal direction of the outer cylinder 2. The lock seam portion 7 is provided by hemming bonding in which the mating portions are fitted and crimped by the hemmings 7a and 7b. Therefore, the present invention relates to the lock seam portion 7.
Further, a concave groove 8 continuous over the entire length in the longitudinal direction is formed by pressing. The depression 8 may be formed by pressing one or a plurality of grooves in the area of the lock seam portion 7 or on either the outer surface or the inner surface of the outer cylinder 2. Since the present invention has the structure as described above, the hemmings 7a, 7a of the lock seam portion 7 in the longitudinal direction of the outer cylinder 2 are provided.
As for b, the adhesion is further enhanced by the formation of the groove 8 and the hemmings 7a and 7b formed by the formation of the groove 8 are bent in a wave form to act as a ventilation resistance, and the airtightness of the lock seam portion 7 against the internal pressure is increased. Is secured. As a result, the possibility of gas leakage from the lock seam portion 7 in the longitudinal direction of the outer cylinder 2 can be reduced. Further, the strength of the fitting of the hemmings 7a and 7b of the lock seam portion 7 is increased by the formation of the concave groove 8, and the fitting and the loosening of the hemmings 7a and 7b due to vibrations and the like are prevented from being displaced and loosened. 2 can be maintained in a normal form, and the airtightness can be improved. As described above, according to the present invention, a continuous concave groove is formed by pressing over the entire length in the longitudinal direction of the lock seam portion of the outer cylinder, and the fitting portion of the hemming is brought into close contact. The simple structure has the advantage of improving the airtightness inside the muffler.
【図面の簡単な説明】 【図１】本発明の側面図 【図２】図１のＡ−Ａ線拡大断面図 【図３】従来のシーム溶接による外筒の側面図 【図４】従来のロックシームによる外筒の側面図 【符号の説明】 １ マフラ本体 ２ 外筒 ３ 端板 ４ 端板 ５ 排気ガス取り入れ口 ６ 排気ガス出口 ７ ロックシーム部 ７ａ ヘミング ７ｂ ヘミング ８ 凹溝[Brief description of the drawings] FIG. 1 is a side view of the present invention. FIG. 2 is an enlarged sectional view taken along line AA of FIG. 1; FIG. 3 is a side view of a conventional outer cylinder formed by seam welding. FIG. 4 is a side view of an outer cylinder formed by a conventional lock seam. [Explanation of symbols] 1 Muffler body 2 outer cylinder 3 End plate 4 End plate 5 Exhaust gas intake 6 Exhaust gas outlet 7 Rock seam section 7a Hemming 7b hemming 8 groove
Claims (1)
したロックシーム部を有するマフラの外筒において、前
記ロックシーム部に、その長手方向の全長に渡って連続
した凹溝を押圧形成したことを特徴とするマフラ外筒構
造。(57) [Claim 1] In an outer cylinder of a muffler having a lock seam portion formed by hemming a joining portion in a longitudinal direction of a cylinder, the lock seam portion extends over the entire length in the longitudinal direction. Continuous
Muffler outer cylinder structure characterized by press-formed concave grooves .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02630598A JP3452304B2 (en) | 1998-01-26 | 1998-01-26 | Muffler outer cylinder structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP02630598A JP3452304B2 (en) | 1998-01-26 | 1998-01-26 | Muffler outer cylinder structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11210438A JPH11210438A (en) | 1999-08-03 |
| JP3452304B2 true JP3452304B2 (en) | 2003-09-29 |
Family
ID=12189663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP02630598A Expired - Fee Related JP3452304B2 (en) | 1998-01-26 | 1998-01-26 | Muffler outer cylinder structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3452304B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100357397B1 (en) * | 2000-10-16 | 2002-10-19 | 기아자동차주식회사 | Vehicle muffler manufacturing method |
-
1998
- 1998-01-26 JP JP02630598A patent/JP3452304B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11210438A (en) | 1999-08-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080718 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
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| FPAY | Renewal fee payment (event date is renewal date of database) |
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|
| LAPS | Cancellation because of no payment of annual fees |