JP2005120966A - Exhaust-pipe joint structure - Google Patents

Exhaust-pipe joint structure Download PDF

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JP2005120966A
JP2005120966A JP2003359041A JP2003359041A JP2005120966A JP 2005120966 A JP2005120966 A JP 2005120966A JP 2003359041 A JP2003359041 A JP 2003359041A JP 2003359041 A JP2003359041 A JP 2003359041A JP 2005120966 A JP2005120966 A JP 2005120966A
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flange
exhaust pipe
exhaust
joint structure
female flange
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JP4323284B2 (en
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Masahiro Kimura
昌裕 木村
Tadahiko Fukumoto
忠彦 福本
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Hino Motors Ltd
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Hino Motors Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust-pipe joint structure by which rotation of exhaust pipes before being set up can be surely prevented without adding an extra hanger point. <P>SOLUTION: In the exhaust-pipe joint structure, a tapered part 1a broadened toward the end of one exhaust pipe 1 is pinched between a mail flange 3 fixed on the end of the other exhaust pipe 2 and a female flange 4 of an independent part. Bolts 5 are inserted in bolt holes 3b, 4b made in outer peripheral parts of the male flange 3 and the female flange 4, and both the parts are tightened by nuts 6. Thus, both exhaust pipes 1, 2 are tightly jointed by wedge effect. A plurality of spots in the peripheral direction in the tapered part 1a of the exhaust pipe 1 are spot-welded beforehand to concave parts 4a constituting a pinch-holding face on the female flange 4, and the whole area in the tapered part 1a including the spot-welded points 10 is pinched between the male flange 3 and the female flange 4. <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フリーフランジ式の継手構造の採用が検討されている。   However, such a plug-in joint structure has not been satisfactory in its gas leakage prevention property, and in recent years, a free-flange type joint structure having a better gas leakage prevention property than the conventional plug-in joint structure. Adoption is being considered.

このフリーフランジ式の継手構造は、図３に示す如く、接続すべき一方の排気管１の端部に末広がりにテーパ部１ａを形成すると共に、このテーパ部１ａを他方の排気管２の端部に溶接した雄型フランジ３と独立部品の雌型フランジ４との間に挟み込んでボルト５及びナット６の締結により締め付け、楔作用を利用して両排気管１，２を緊密に接続するようにしたものである。   As shown in FIG. 3, the free flange type joint structure is formed with a taper portion 1a at the end of one exhaust pipe 1 to be connected, and a tapered portion 1a is formed at the end of the other exhaust pipe 2. So that the exhaust pipes 1 and 2 are tightly connected to each other by using a wedge action. It is a thing.

より具体的に述べれば、図４に各排気管１，２の締結前の状態で図示している如く、排気管２の端部の外周部に溶接されている雄型フランジ３が、接続相手側に向け徐々に縮径しながら張り出す膨出部３ａを具備しており、この膨出部３ａのテーパ面に沿う形で排気管１にベルマウス状のテーパ部１ａ（特に図５参照）が形成されている。   More specifically, as shown in FIG. 4 in a state before the exhaust pipes 1 and 2 are fastened, the male flange 3 welded to the outer peripheral portion of the end of the exhaust pipe 2 is connected to the connection partner. It has a bulging portion 3a that protrudes while gradually reducing its diameter toward the side, and a bell mouth shaped tapered portion 1a (see particularly FIG. 5) in the exhaust pipe 1 along the tapered surface of the bulging portion 3a. Is formed.

そして、前記雌型フランジ４には、前記雄型フランジ３の膨出部３ａに合致するよう徐々に縮径しながら後退する擂り鉢状の凹面部４ａが形成されており、この凹面部４ａと前記雄型フランジ３の膨出部３ａとの間で排気管１のテーパ部１ａを挾持し得るようにしてある。   The female flange 4 is formed with a bowl-shaped concave surface portion 4a that gradually recedes so as to coincide with the bulging portion 3a of the male flange 3, and this concave surface portion 4a The tapered portion 1 a of the exhaust pipe 1 can be held between the bulging portion 3 a of the male flange 3.

また、ここに図示している例においては、前記雄型フランジ３の上下端部と、前記雌型フランジ４の上下端部とにボルト孔３ｂ，４ｂが夫々形成されており、このボルト孔３ｂ，４ｂに両排気管１，２の軸心方向（図３中の左右方向）に延びるボルト５を挿通してナット６と締結することにより前記凹面部４ａと膨出部３ａとの間で排気管１のテーパ部１ａを挾圧保持して楔作用が得られるようにしてある。   In the example shown here, bolt holes 3b and 4b are formed in the upper and lower ends of the male flange 3 and the upper and lower ends of the female flange 4, respectively. , 4b are inserted between bolts 5 extending in the axial direction of the exhaust pipes 1 and 2 (left and right direction in FIG. 3) and fastened to the nut 6 to exhaust between the concave portion 4a and the bulging portion 3a. The tapered portion 1a of the tube 1 is held under pressure so that a wedge action is obtained.

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２００２−３４９２５８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 2002-349258 A

そして、斯かるフリーフランジ式の継手構造を採用するにあたり、前述した如き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」にする場合と、マフラ直後のテールパイプ部分をそのまま車両後方に延ばして「後出し」とする場合とで継手構造を二種類に分けてしまうことは、いたずらに部品点数の増加を招いてしまうことにつながるため、何れの場合にもフリーフランジ式の継手構造を採用して部品の共通化を図ることが考えられている。   In adopting such a free-flange type joint structure, the tail pipe portion immediately after the muffler is bent in the vehicle width direction as described above to “side-out”, and the tail pipe portion immediately after the muffler is used as it is in the rear of the vehicle. If the joint structure is divided into two types in the case of “later”, it will lead to an unnecessarily increased number of parts, so in any case a free flange type joint structure It is considered to use parts to make parts common.

しかしながら、「後出し」の型式を採用した車両では、継手箇所の締結を完了するまで軸心回りの回転が許容されてしまうことが、その締結作業を煩雑なものにしてしまうという不具合があり、例えば、図６に示す如く、マフラ７直後のテールパイプ部分を成す排気管１，２を接続する際に、既存の吊り点８に本来必要ではない吊り点９を追加する等して前記排気管１の回り止め対策を施さなければならなかった。   However, in the vehicle adopting the “later” type, there is a problem that the rotation around the shaft center is allowed until the fastening of the joint portion is completed, which makes the fastening work complicated. For example, as shown in FIG. 6, when connecting the exhaust pipes 1 and 2 forming the tail pipe portion immediately after the muffler 7, the exhaust pipe 1 is added to the existing suspension point 8 by adding a suspension point 9 that is not originally necessary. I had to take 1 anti-rotation measures.

本発明は上述の実情に鑑みてなしたもので、余分な吊り点を新たに追加することなく排気管の締結作業中の回転を確実に防止し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する。   The present invention has been made in view of the above circumstances, and provides an exhaust pipe joint structure capable of reliably preventing rotation during fastening operation of the exhaust pipe without adding an extra hanging point. With the goal.

本発明は、一方の排気管の端部に末広がりに形成したテーパ部を、他方の排気管の端部に固定した雄型フランジと独立部品の雌型フランジとの間で挟み込み、これら雄型フランジ及び雌型フランジの外周部分に設けたボルト孔にボルトを嵌挿してナットで締め付け、両排気管を楔作用を効かせて緊密に接続した排気管継手構造であって、一方の排気管のテーパ部における周方向複数箇所を雌型フランジ側の挾持面に対し予めスポット溶接しておき、そのスポット溶接点を含む前記テーパ部の全域を雄型フランジと雌型フランジとの間で挾圧保持せしめたことを特徴とするものである。   According to the present invention, a tapered portion formed at the end portion of one exhaust pipe is sandwiched between a male flange fixed to the end portion of the other exhaust pipe and a female flange of an independent part. And an exhaust pipe joint structure in which a bolt is inserted into a bolt hole provided in the outer peripheral portion of the female flange and tightened with a nut, and both exhaust pipes are tightly connected by applying a wedge action, and the taper of one exhaust pipe is Spot welded to the holding surface on the female flange side in advance in the circumferential direction, and the entire area of the tapered portion including the spot weld point is held between the male flange and the female flange by pressure. It is characterized by that.

而して、このようにすれば、一方の排気管のテーパ部における周方向複数箇所が雌型フランジ側の挾持面に対しスポット溶接されることで一体化され、他方の排気管側の雄型フランジと雌型フランジとの締結作業が完了するまで一方の排気管の回転が防止されるので、余分な吊り点を新たに追加する必要がなくなる。   Thus, in this way, a plurality of circumferential locations in the tapered portion of one exhaust pipe are integrated by spot welding to the holding surface on the female flange side, and the male mold on the other exhaust pipe side is integrated. Since the rotation of one of the exhaust pipes is prevented until the fastening operation between the flange and the female flange is completed, it is not necessary to add an extra hanging point.

しかも、スポット溶接点を含むテーパ部の全域が雄型フランジと雌型フランジとの間で挾圧保持されるので、継手箇所への荷重の入力が前記テーパ部全体に分散吸収されることになり、前記スポット溶接点に応力が集中しなくて済む。   In addition, since the entire area of the tapered portion including the spot welding point is held under pressure between the male flange and the female flange, the load input to the joint portion is dispersed and absorbed by the entire tapered portion. The stress does not have to be concentrated on the spot welding point.

また、雄型フランジと雌型フランジとの締結状態を緩めることにより一方の排気管の軸心回りの回転が許容されるように接続したい場合には、スポット溶接をやめるだけで簡単に対応することが可能となる。   Also, if you want to connect so that the rotation around the axis of one exhaust pipe is allowed by loosening the fastening state of the male flange and female flange, you can simply cope with it by stopping spot welding. Is possible.

上記した本発明の排気管継手構造によれば、下記の如き種々の優れた効果を奏し得る。   According to the exhaust pipe joint structure of the present invention described above, the following various excellent effects can be obtained.

（Ｉ）余分な吊り点を新たに追加することなく排気管の締結作業中の回転を確実に防止することができるので、排気管の締結作業を少ない労力で円滑に進めることができ、排気管の締結作業に要する作業負担を大幅に軽減することができる。   (I) Since it is possible to reliably prevent the rotation during the exhaust pipe fastening operation without newly adding an extra hanging point, the exhaust pipe fastening work can be smoothly advanced with less labor. The work burden required for the fastening work can be greatly reduced.

（ＩＩ）継手箇所への荷重の入力をテーパ部全体に分散吸収させることができるので、一方の排気管のテーパ部と雌型フランジの挾持面とのスポット溶接点に応力が集中する虞れを未然に回避することができ、継手箇所の強度信頼性を大幅に向上することができる。   (II) Since the load input to the joint location can be dispersed and absorbed throughout the taper portion, there is a possibility that stress may concentrate on the spot welding point between the taper portion of one exhaust pipe and the holding surface of the female flange. This can be avoided in advance, and the strength reliability of the joint location can be greatly improved.

（ＩＩＩ）雄型フランジと雌型フランジとの締結状態を緩めることにより一方の排気管の軸心回りの回転が許容されるように接続したい場合に、一方の排気管のテーパ部と雌型フランジの挾持面とのスポット溶接をやめるだけで簡単に対応することができるので、支障なく部品を共通化し得てコストの大幅な削減を図ることができる。   (III) When it is desired to connect the male flange and the female flange so that the rotation around the axis of one exhaust pipe is allowed by loosening the fastening state between the male flange and the female flange, the taper portion of the one exhaust pipe and the female flange Since it is possible to easily cope with the problem by simply eliminating the spot welding with the holding surface, it is possible to share the parts without any trouble and to greatly reduce the cost.

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及び図２に示す如く、本形態例においては、前述した図３〜図６と略同様に構成したフリーフランジ式の継手構造を、マフラ７（図６参照）直後のテールパイプ部分をそのまま車両後方に延ばして「後出し」とする車両に適用した場合を例示しており、一方の排気管１のテーパ部１ａにおける上下二箇所を雌型フランジ４側の挾持面を成す凹面部４ａに対し予めスポット溶接しておき、その各スポット溶接点１０を含む前記テーパ部１ａの全域を雄型フランジ３と雌型フランジ４との間で挾圧保持せしめた構造としている。   As shown in FIGS. 1 and 2, in this embodiment, the free flange type joint structure constructed in substantially the same manner as in FIGS. 3 to 6 is used, and the tail pipe portion immediately after the muffler 7 (see FIG. 6) is used as it is. This example illustrates a case where the present invention is applied to a vehicle that extends to the rear of the vehicle and is “rearward”. The two upper and lower portions of the taper portion 1a of one exhaust pipe 1 are formed as a concave surface portion 4a that forms a holding surface on the female flange 4 side. In contrast, spot welding is performed in advance, and the entire taper portion 1 a including each spot welding point 10 is held between the male flange 3 and the female flange 4 by pressure.

而して、このようにすれば、一方の排気管１のテーパ部１ａにおける上下二箇所が雌型フランジ４側の凹面部４ａに対しスポット溶接されることで一体化され、他方の排気管２側の雄型フランジ３と雌型フランジ４とのボルト５及びナット６による締結作業が完了するまで一方の排気管１の回転が防止されるので、余分な吊り点９（図６参照）を新たに追加する必要がなくなる。   Thus, in this way, the upper and lower portions of the tapered portion 1a of one exhaust pipe 1 are integrated by spot welding to the concave surface portion 4a on the female flange 4 side, and the other exhaust pipe 2 is integrated. Since the rotation of one exhaust pipe 1 is prevented until the fastening operation by the bolt 5 and the nut 6 between the male flange 3 and the female flange 4 on the side is completed, an extra hanging point 9 (see FIG. 6) is newly added. No need to add to

しかも、スポット溶接点１０を含むテーパ部１ａの全域が、雄型フランジ３の膨出部３ａと雌型フランジ４の凹面部４ａとの間で挾圧保持されるので、継手箇所への荷重の入力が前記テーパ部１ａ全体に分散吸収されることになり、前記スポット溶接点１０に応力が集中しなくて済む。   In addition, since the entire area of the taper portion 1a including the spot welding point 10 is held under pressure between the bulging portion 3a of the male flange 3 and the concave surface portion 4a of the female flange 4, the load on the joint location is reduced. The input is dispersed and absorbed by the entire tapered portion 1a, and stress does not have to be concentrated on the spot welding point 10.

従って、上記形態例によれば、余分な吊り点９（図６参照）を新たに追加することなく一方の排気管１の締結作業中の回転を確実に防止することができるので、排気管１，２の締結作業を少ない労力で円滑に進めることができ、排気管１，２の締結作業に要する作業負担を大幅に軽減することができる。   Therefore, according to the above embodiment, the rotation during the fastening operation of one exhaust pipe 1 can be surely prevented without newly adding an extra hanging point 9 (see FIG. 6). , 2 can be smoothly advanced with less labor, and the work load required for the fastening work of the exhaust pipes 1, 2 can be greatly reduced.

更に、継手箇所への荷重の入力をテーパ部１ａ全体に分散吸収させることができるので、一方の排気管１のテーパ部１ａと雌型フランジ４の凹面部４ａとのスポット溶接点１０に応力が集中する虞れを未然に回避することができ、継手箇所の強度信頼性を大幅に向上することができる。   Furthermore, since the load input to the joint portion can be dispersed and absorbed throughout the taper portion 1 a, stress is applied to the spot welding point 10 between the taper portion 1 a of one exhaust pipe 1 and the concave surface portion 4 a of the female flange 4. The possibility of concentration can be avoided in advance, and the strength reliability of joints can be greatly improved.

また、このような構造によれば、雄型フランジ３と雌型フランジ４との締結状態を緩めることにより一方の排気管１の軸心回りの回転が許容されるように接続したい場合に、一方の排気管１のテーパ部１ａと雌型フランジ４の凹面部４ａとのスポット溶接をやめるだけで簡単に対応することができるので、支障なく部品を共通化し得てコストの大幅な削減を図ることができる。   Further, according to such a structure, when it is desired to connect the male flange 3 and the female flange 4 so as to allow rotation around the axis of one exhaust pipe 1 by loosening the fastening state of the male flange 3 and the female flange 4, Since it is possible to easily cope with the problem by simply eliminating the spot welding between the tapered portion 1a of the exhaust pipe 1 and the concave surface portion 4a of the female flange 4, the parts can be shared without any trouble and the cost can be greatly reduced. Can do.

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、一方の排気管のテーパ部における周方向三箇所以上にスポット溶接を施しても良いこと、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。   In addition, the exhaust pipe joint structure of the present invention is not limited to the above-described embodiment, and spot welding may be performed at three or more locations in the circumferential direction in the taper portion of one exhaust pipe. Of course, various modifications can be made without departing from the scope of the invention.

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. 図１の要部についての拡大図である。It is an enlarged view about the principal part of FIG. 従来例を示す部分断面図である。It is a fragmentary sectional view showing a conventional example. 図３の各排気管を締結する前の状態を示す断面図である。It is sectional drawing which shows the state before fastening each exhaust pipe of FIG. 図３の一方の排気管の端部に形成したテーパ部の部分断面図である。It is a fragmentary sectional view of the taper part formed in the edge part of one exhaust pipe of FIG. 排気管の吊り点を追加した例を示す側面図である。It is a side view which shows the example which added the suspending point of the exhaust pipe.

符号の説明Explanation of symbols

１ 排気管
１ａ テーパ部
２ 排気管
３ 雄型フランジ
３ｂ ボルト孔
４ 雌型フランジ
４ａ 凹面部（挾持面）
４ｂ ボルト孔
５ ボルト
６ ナット
１０ スポット溶接点 DESCRIPTION OF SYMBOLS 1 Exhaust pipe 1a Tapered part 2 Exhaust pipe 3 Male flange 3b Bolt hole 4 Female flange 4a Concave surface part (holding surface)
4b Bolt hole 5 Bolt 6 Nut 10 Spot welding point

Claims (1)

一方の排気管の端部に末広がりに形成したテーパ部を、他方の排気管の端部に固定した雄型フランジと独立部品の雌型フランジとの間で挟み込み、これら雄型フランジ及び雌型フランジの外周部分に設けたボルト孔にボルトを嵌挿してナットで締め付け、両排気管を楔作用を効かせて緊密に接続した排気管継手構造であって、一方の排気管のテーパ部における周方向複数箇所を雌型フランジ側の挾持面に対し予めスポット溶接しておき、そのスポット溶接点を含む前記テーパ部の全域を雄型フランジと雌型フランジとの間で挾圧保持せしめたことを特徴とする排気管継手構造。   A tapered portion formed at the end of one exhaust pipe is sandwiched between a male flange fixed to the end of the other exhaust pipe and a female flange as an independent part. These male flange and female flange An exhaust pipe joint structure in which a bolt is inserted into a bolt hole provided in the outer peripheral portion of the exhaust pipe and tightened with a nut, and both exhaust pipes are tightly connected by applying a wedge action, and the circumferential direction of the tapered part of one exhaust pipe A plurality of spots are spot-welded in advance to the holding surface on the female flange side, and the entire area of the tapered portion including the spot welding point is held between the male flange and the female flange by pressure. Exhaust pipe joint structure.
JP2003359041A 2003-10-20 2003-10-20 Exhaust pipe joint structure Expired - Fee Related JP4323284B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007113573A (en) * 2005-10-18 2007-05-10 General Electric Co <Ge> Method and device for assembling composite structure
CN102852614A (en) * 2012-09-05 2013-01-02 周峰 Connecting structure of bend and exhaust pipe in exhaust pipe water entering preventer
US9687784B2 (en) 2014-04-08 2017-06-27 Tenneco Automotive Operating Company Inc. Exhaust system having segmented service flange
WO2018110485A1 (en) * 2016-12-15 2018-06-21 ダイムラー・アクチェンゲゼルシャフト Vehicle tail pipe structure

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007113573A (en) * 2005-10-18 2007-05-10 General Electric Co <Ge> Method and device for assembling composite structure
US8079773B2 (en) 2005-10-18 2011-12-20 General Electric Company Methods and apparatus for assembling composite structures
CN102852614A (en) * 2012-09-05 2013-01-02 周峰 Connecting structure of bend and exhaust pipe in exhaust pipe water entering preventer
US9687784B2 (en) 2014-04-08 2017-06-27 Tenneco Automotive Operating Company Inc. Exhaust system having segmented service flange
WO2018110485A1 (en) * 2016-12-15 2018-06-21 ダイムラー・アクチェンゲゼルシャフト Vehicle tail pipe structure

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