JP2005172156A - Exhaust pipe joint structure - Google Patents

Exhaust pipe joint structure Download PDF

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Publication number
JP2005172156A
JP2005172156A JP2003414624A JP2003414624A JP2005172156A JP 2005172156 A JP2005172156 A JP 2005172156A JP 2003414624 A JP2003414624 A JP 2003414624A JP 2003414624 A JP2003414624 A JP 2003414624A JP 2005172156 A JP2005172156 A JP 2005172156A
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Japan
Prior art keywords
exhaust pipe
enlarged diameter
joint structure
exhaust
pipe
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Pending
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JP2003414624A
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Japanese (ja)
Inventor
Toshiki Oya
敏樹 大矢
Hiroshi Endo
浩史 遠藤
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Hino Motors Ltd
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Hino Motors Ltd
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Priority to JP2003414624A priority Critical patent/JP2005172156A/en
Publication of JP2005172156A publication Critical patent/JP2005172156A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00—Flanged joints
    • F16L23/04—Flanged joints the flanges being connected by members tensioned in the radial plane
    • F16L23/06—Flanged joints the flanges being connected by members tensioned in the radial plane connected by toggle-action levers
    • 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 ; 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • F01N13/1855—Mechanical joints the connection being realised by using bolts, screws, rivets or the like
    • 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 ; 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • 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 ; 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • F01N13/1877—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal the channels or tubes thereof being made integrally with the housing

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Exhaust Silencers (AREA)
  • Flanged Joints, Insulating Joints, And Other Joints (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide exhaust pipe joint structure for preventing generation of an air current vortex and drastically reducing air current noises. <P>SOLUTION: While an enlarged diameter part 2 forming an angle-shaped cross section throughout an entire periphery on an end part of one exhaust pipe 1 is formed, a tapered part 4 is formed in a divergent shape on the end part of the other exhaust pipe 3. The end part of one exhaust pipe 1 is inserted in the end part of the other exhaust pipe 3, and the tapered part 4 is put along a tilt surface 2a in front of the enlarged diameter part 2. A V-shaped clamp 6 having a V-shaped groove 5 corresponding to an angle shape of the enlarged diameter part 2 is externally fitted and mounted to the tapered part 4 and the enlarged diameter part 2 to be tightened. Both exhaust pipes 1, 3 are closely connected by a wedge action of the V-shaped clamp 6. An inner pipe 16 is internally fitted and mounted to the end part of one exhaust pipe 1 so as to cover a recessed part 13 of an inner peripheral side of the enlarged diameter part 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、排気管継手構造に関するものである。   The present invention relates to an exhaust pipe joint structure.

車両における排気管は複数箇所にてフランジ継手を介し接続されるようになっているのが通常であるが、例えば、トラック等ではマフラ直後のテールパイプ部分を車幅方向に曲げて「横出し」にしたものがあり、このような「横出し」の型式を採用した車両では、車体側部に適宜に取り付けられる架装物に応じマフラの軸心回りにテールパイプ部分を傾動して前記架装物との干渉を避けたいという要望がある。   Normally, exhaust pipes in vehicles are connected via flange joints at multiple locations. For example, in trucks, etc., the tail pipe part just after the muffler is bent in the vehicle width direction. In vehicles employing such a “side-out” type, the tail pipe portion is tilted around the axis of the muffler according to the body to be appropriately attached to the side of the vehicle body. There is a desire to avoid interference with things.

このため、従来においては、マフラ直後の継手箇所の締結状態を緩めることにより軸心回りの回転を許容して適宜な回転位置で再び締結し得るようにした差し込み式の継手構造、即ち、一方の端部に対し他方の端部をスリット等を入れて拡管した上で外嵌装着し且つその外周囲をクランプにより締結するようにした継手構造が一般的に採用されていた。   For this reason, in the past, a plug-in type joint structure in which one of the joints immediately after the muffler is loosened and allowed to rotate around the axis center and can be fastened again at an appropriate rotational position. A joint structure is generally employed in which the other end is expanded with a slit or the like and the outer end is attached and the outer periphery is fastened with a clamp.

ただし、斯かる差し込み式の継手構造では、そのガス漏れ防止性が満足のいくものではなかったため、近年においては、従来の差し込み式の継手構造よりガス漏れ防止性の良いＶ型クランプを利用した継手構造の採用が検討されている。   However, such a plug-type joint structure has not been satisfactory in its gas leakage prevention property, and in recent years, a joint using a V-type clamp having a better gas leakage prevention property than the conventional plug-in joint structure. Adoption of the structure is under consideration.

即ち、Ｖ型クランプを利用した継手構造とは、図３に示す如く、接続すべき一方の排気管１の端部（ここではマフラ直後の排気管を図示している）に全周に亘り山型断面を成す拡径部２を形成する一方、図４に示す如く、他方の排気管３の端部には末広がり状にテーパ部４を形成し、図５に示す如く、一方の排気管１の端部を他方の排気管３の端部に挿入して前記拡径部２の手前側の傾斜面２ａに前記テーパ部４を沿わせ、これらテーパ部４及び拡径部２に該拡径部２の山型形状に対応したＶ字溝５を有するＶ型クランプ６を外嵌装着して締め付け、該Ｖ型クランプ６の楔作用により両排気管１，３を緊密に接続するようにしたものである。   That is, as shown in FIG. 3, the joint structure using the V-shaped clamp is a mountain over the entire circumference at the end of one exhaust pipe 1 to be connected (here, the exhaust pipe immediately after the muffler is shown). While the enlarged diameter portion 2 forming the mold section is formed, as shown in FIG. 4, a tapered portion 4 is formed at the end of the other exhaust pipe 3 so as to widen toward the end, and as shown in FIG. Is inserted into the end of the other exhaust pipe 3 so that the tapered portion 4 is along the inclined surface 2a on the near side of the enlarged diameter portion 2, and the enlarged diameter is applied to the tapered portion 4 and the enlarged diameter portion 2. The V-shaped clamp 6 having the V-shaped groove 5 corresponding to the mountain shape of the portion 2 is externally fitted and tightened, and the exhaust pipes 1 and 3 are tightly connected by the wedge action of the V-shaped clamp 6. Is.

図６は前記Ｖ型クランプ６の詳細を補足的に説明するための全体図であり、ここに図示している例では、Ｖ字溝５を有する一対のリテーナ７を内周側に固着したバンド８の一端にクイッククラッチ９を介して接続したボルト部１０に対し、前記バンド８の他端に装備したトラニオン１１を遊嵌してナット１２で締め込むことにより前記バンド８にテンションを付与せしめ、これにより排気管１，３の中心に向かって締め付け力を働かせるようになっている。   FIG. 6 is an overall view for supplementarily explaining details of the V-shaped clamp 6. In the example shown here, a pair of retainers 7 having V-shaped grooves 5 are fixed to the inner peripheral side. A trunnion 11 provided on the other end of the band 8 is loosely fitted to a bolt portion 10 connected to one end of the band 8 via a quick clutch 9 and tightened with a nut 12 to apply tension to the band 8. As a result, a tightening force is applied toward the center of the exhaust pipes 1 and 3.

尚、この種の排気管の継手構造に関連する先行技術文献情報としては例えば下記の特許文献１等がある。
特開平１０−８９０５９号公報 As prior art document information related to this type of exhaust pipe joint structure, for example, there is the following Patent Document 1.
JP-A-10-89059

しかしながら、斯かるＶ型クランプ６を利用した従来の継手構造では、一方の排気管１の端部における拡径部２の内周側に窪み部１３（図５参照）ができてしまうので、排気管１から排気管３へ流れる排出ガス１４が前記窪み部１３を通過する際に気流渦１５（図５参照）を生じ、この気流渦１５を要因として車両の全負荷加速時等に気流騒音が発生するという問題があった。   However, in the conventional joint structure using such a V-shaped clamp 6, a recess 13 (see FIG. 5) is formed on the inner peripheral side of the enlarged diameter portion 2 at the end of one exhaust pipe 1. When the exhaust gas 14 flowing from the pipe 1 to the exhaust pipe 3 passes through the recess 13, an airflow vortex 15 (see FIG. 5) is generated, and airflow noise is generated during acceleration of the full load of the vehicle due to the airflow vortex 15. There was a problem that occurred.

本発明は上述の実情に鑑みてなしたもので、気流渦の発生を防止して気流騒音の大幅な低減化を図り得るようにした排気管継手構造を提供することを目的としている。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an exhaust pipe joint structure capable of preventing generation of airflow vortices and greatly reducing airflow noise.

本発明は、一方の排気管の端部に全周に亘り山型断面を成す拡径部を形成すると共に、他方の排気管の端部には末広がり状にテーパ部を形成し、一方の排気管の端部を他方の排気管の端部に挿入して前記拡径部の手前側の傾斜面に前記テーパ部を沿わせ、これらテーパ部及び拡径部に該拡径部の山型形状に対応したＶ字溝を有するＶ型クランプを外嵌装着して締め付け、該Ｖ型クランプの楔作用により両排気管を緊密に接続した排気管継手構造であって、一方の排気管の端部に前記拡径部内周側の窪み部を被覆し得るようインナーパイプを内嵌装着したことを特徴とするものである。   In the present invention, an enlarged diameter portion having a mountain-shaped cross section is formed at the end of one exhaust pipe, and a tapered portion is formed at the end of the other exhaust pipe so as to be widened toward the end. Insert the end of the pipe into the end of the other exhaust pipe, and place the tapered portion along the inclined surface on the near side of the enlarged diameter portion, and the tapered shape of the enlarged diameter portion on the tapered portion and the enlarged diameter portion An exhaust pipe joint structure in which a V-type clamp having a V-shaped groove corresponding to the above is fitted and tightened, and both exhaust pipes are tightly connected by the wedge action of the V-type clamp, and the end of one exhaust pipe Further, the inner pipe is fitted and attached so as to cover the hollow portion on the inner peripheral side of the enlarged diameter portion.

而して、このようにすれば、インナーパイプで拡径部の内周側の窪み部が被覆されることにより、一方の排気管の端部における内周面がインナーパイプを介し窪みなく滑らかに連続するものとなり、ここを流れる排出ガスが一方の排気管の内周面に沿い剥離なく流れて整流化されるので、従来の如き気流渦が発生しなくなって、該気流渦を要因とする気流騒音が大幅に低減されることになる。   In this way, the inner pipe covers the inner-side depression of the enlarged diameter portion with the inner pipe, so that the inner circumferential surface at the end of one exhaust pipe can be smooth without depression through the inner pipe. Since the exhaust gas flowing through this flow is rectified by flowing along the inner peripheral surface of one of the exhaust pipes without being separated, the air flow vortex is no longer generated and the air flow caused by the air flow vortex Noise will be greatly reduced.

上記した本発明の排気管継手構造によれば、インナーパイプで拡径部の内周側の窪み部を被覆したことにより、該窪み部における気流渦の発生を確実に防止して排出ガスの流れの整流化を図ることができるので、気流渦を要因とする気流騒音を従来より大幅に低減することができるという優れた効果を奏し得る。   According to the above-described exhaust pipe joint structure of the present invention, the inner pipe covers the hollow portion on the inner peripheral side of the enlarged diameter portion, thereby reliably preventing the generation of airflow vortices in the hollow portion and the flow of exhaust gas. Therefore, the air flow noise caused by the air flow vortex can be greatly reduced as compared with the prior art.

以下本発明の実施の形態を図面を参照しつつ説明する。   Embodiments of the present invention will be described below with reference to the drawings.

図１及び図２は本発明を実施する形態の一例を示すもので、図３〜図６と同一の符号を付した部分は同一物を表わしている。   1 and 2 show an example of an embodiment for carrying out the present invention, and portions denoted by the same reference numerals as those in FIGS. 3 to 6 represent the same items.

図１に示す如く、本形態例においては、前述した図３〜図６と略同様のＶ型クランプ６を利用した継手構造に関し、一方の排気管１の端部に、前記拡径部２の内周側に形成される窪み部１３を被覆し得るようにインナーパイプ１６を内嵌装着したものとなっている。   As shown in FIG. 1, in this embodiment, a joint structure using a V-shaped clamp 6 that is substantially the same as that shown in FIGS. 3 to 6 described above is provided. The inner pipe 16 is fitted and attached so as to cover the recess 13 formed on the inner peripheral side.

而して、このように一方の排気管１の端部にインナーパイプ１６を内嵌装着しておけば、インナーパイプ１６で拡径部２の内周側の窪み部１３が被覆されることにより、一方の排気管１の端部における内周面が前記インナーパイプ１６を介し窪みなく滑らかに連続するものとなり、ここを流れる排出ガス１４が排気管１の内周面に沿い剥離なく流れて整流化されるので、従来の如き気流渦が発生しなくなって、該気流渦を要因とする気流騒音が大幅に低減されることになる。   Thus, if the inner pipe 16 is fitted and attached to the end of one exhaust pipe 1 in this way, the inner pipe 16 covers the recess 13 on the inner peripheral side of the enlarged diameter portion 2. The inner peripheral surface at the end of one of the exhaust pipes 1 is smoothly continuous without being depressed through the inner pipe 16, and the exhaust gas 14 flowing therethrough flows along the inner peripheral surface of the exhaust pipe 1 without separation and is rectified. Therefore, the conventional airflow vortex is not generated, and the airflow noise caused by the airflow vortex is greatly reduced.

事実、本発明者らによる検証実験によれば、図２にグラフで示す通り、インナーパイプ１６が有る場合と無い場合とを比較した場合に、人間の聴力で最も感度が高い領域である約２．５〜３．０ＫＨｚの周波数帯で非常に効果的な音圧レベルの低下が確認された。   In fact, according to a verification experiment by the present inventors, as shown by a graph in FIG. 2, when comparing the case where the inner pipe 16 is present and the case where the inner pipe 16 is not present, it is about 2 which is the most sensitive region in human hearing. A very effective reduction in sound pressure level was confirmed in the frequency band of .5 to 3.0 KHz.

従って、上記形態例によれば、インナーパイプ１６で拡径部２の内周側の窪み部１３を被覆したことにより、該窪み部１３における気流渦の発生を確実に防止して排出ガス１４の流れの整流化を図ることができるので、気流渦を要因とする気流騒音を従来より大幅に低減することができる。   Therefore, according to the embodiment described above, the inner pipe 16 covers the recess 13 on the inner peripheral side of the enlarged diameter portion 2, thereby reliably preventing the generation of airflow vortices in the recess 13. Since flow rectification can be achieved, airflow noise caused by airflow vortices can be significantly reduced as compared with the conventional case.

尚、本発明の排気管継手構造は、上述の形態例にのみ限定されるものではなく、必ずしもマフラ直後のテールパイプ部分における継手構造に限定されないこと、その他、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   Note that the exhaust pipe joint structure of the present invention is not limited to the above-described embodiment, and is not necessarily limited to the joint structure in the tail pipe portion immediately after the muffler, and within the scope not departing from the gist of the present invention. Of course, various changes can be made.

本発明を実施する形態の一例を示す断面図である。It is sectional drawing which shows an example of the form which implements this invention. インナーパイプが有る場合と無い場合を比較したグラフである。It is the graph which compared the case where there is an inner pipe and the case where it does not exist. 従来の継手構造に関する一方の排気管側を示す斜視図である。It is a perspective view which shows one exhaust pipe side regarding the conventional joint structure. 従来の継手構造に関する他方の排気管側を示す部分断面図である。It is a fragmentary sectional view which shows the other exhaust pipe side regarding the conventional joint structure. 両排気管をＶ型クランプで接続した状態を示す部分断面図である。It is a fragmentary sectional view which shows the state which connected both the exhaust pipes with the V-type clamp. 図５のＶ型クランプの詳細な構造を示す全体正面図である。It is a whole front view which shows the detailed structure of the V-shaped clamp of FIG.

符号の説明Explanation of symbols

１ 一方の排気管
２ 拡径部
２ａ 手前側の傾斜面
３ 他方の排気管
４ テーパ部
５ Ｖ字溝
６ Ｖ型クランプ
１３ 窪み部
１４ 排出ガス
１６ インナーパイプ DESCRIPTION OF SYMBOLS 1 Exhaust pipe 2 Expanded diameter part 2a Front side inclined surface 3 Other exhaust pipe 4 Tapered part 5 V-shaped groove 6 V-shaped clamp 13 Depressed part 14 Exhaust gas 16 Inner pipe

Claims (1)

一方の排気管の端部に全周に亘り山型断面を成す拡径部を形成すると共に、他方の排気管の端部には末広がり状にテーパ部を形成し、一方の排気管の端部を他方の排気管の端部に挿入して前記拡径部の手前側の傾斜面に前記テーパ部を沿わせ、これらテーパ部及び拡径部に該拡径部の山型形状に対応したＶ字溝を有するＶ型クランプを外嵌装着して締め付け、該Ｖ型クランプの楔作用により両排気管を緊密に接続した排気管継手構造であって、一方の排気管の端部に前記拡径部内周側の窪み部を被覆し得るようインナーパイプを内嵌装着したことを特徴とする排気管継手構造。   An end of one exhaust pipe is formed with an enlarged diameter portion having a mountain-shaped cross section over the entire circumference, and a tapered portion is formed at the end of the other exhaust pipe so as to be widened toward the end. Is inserted into the end of the other exhaust pipe, the tapered portion is along the inclined surface on the near side of the enlarged diameter portion, and the tapered portion and the enlarged diameter portion correspond to the mountain shape of the enlarged diameter portion. An exhaust pipe joint structure in which a V-type clamp having a groove is externally fitted and tightened, and both exhaust pipes are tightly connected by the wedge action of the V-type clamp, and the expanded diameter is provided at the end of one exhaust pipe An exhaust pipe joint structure in which an inner pipe is fitted and attached so as to cover a recess on the inner peripheral side of the part.
JP2003414624A 2003-12-12 2003-12-12 Exhaust pipe joint structure Pending JP2005172156A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2906864A1 (en) * 2006-10-10 2008-04-11 Caillau Ets Clamping system for sealed connection of e.g. exhaust gas tubes, has washer with sealed portion arranged between sealing surfaces of respective tubes, and cylindrical return axially extending from and connected to inner edge of portion
CN101936209A (en) * 2010-08-31 2011-01-05 重庆长安汽车股份有限公司 Connection structure of exhaust pipe of automobile
EP2474721A1 (en) 2011-01-11 2012-07-11 Etablissements CAILLAU Connection device between tubes and clamping system including such connection device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2906864A1 (en) * 2006-10-10 2008-04-11 Caillau Ets Clamping system for sealed connection of e.g. exhaust gas tubes, has washer with sealed portion arranged between sealing surfaces of respective tubes, and cylindrical return axially extending from and connected to inner edge of portion
CN101936209A (en) * 2010-08-31 2011-01-05 重庆长安汽车股份有限公司 Connection structure of exhaust pipe of automobile
EP2474721A1 (en) 2011-01-11 2012-07-11 Etablissements CAILLAU Connection device between tubes and clamping system including such connection device

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