JP2006348864A - Double exhaust pipe manufacturing method for internal combustion engine - Google Patents

Double exhaust pipe manufacturing method for internal combustion engine Download PDF

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Publication number
JP2006348864A
JP2006348864A JP2005176833A JP2005176833A JP2006348864A JP 2006348864 A JP2006348864 A JP 2006348864A JP 2005176833 A JP2005176833 A JP 2005176833A JP 2005176833 A JP2005176833 A JP 2005176833A JP 2006348864 A JP2006348864 A JP 2006348864A
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Prior art keywords
pipe
seal member
tube
wire mesh
exhaust pipe
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JP2005176833A
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JP4513665B2 (en
Inventor
Seiji Kuroda
政治 黒田
Yasuhiro Nobata
安浩 野畑
Toshiro Murata
登志朗 村田
Taisuke Iwamoto
泰典 岩本
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Toyota Motor Corp
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Toyota Motor Corp
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Priority to JP2005176833A priority Critical patent/JP4513665B2/en
Priority to US11/452,309 priority patent/US20060283002A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/06—Tubes being formed by assembly of stamped 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/24—Concentric tubes or tubes being concentric to housing, e.g. telescopically assembled
    • 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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/26—Tubes being formed by extrusion, drawing or rolling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49229—Prime mover or fluid pump making
    • Y10T29/49231—I.C. [internal combustion] engine making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49909—Securing cup or tube between axially extending concentric annuli
    • Y10T29/49913—Securing cup or tube between axially extending concentric annuli by constricting outer annulus

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Exhaust Silencers (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double exhaust pipe manufacturing method for an internal combustion engine for easily mounting a seal member between an outer pipe and an inner pipe while easily controlling bearing pressure between each of the outer pipe and the inner pipe and the seal member. <P>SOLUTION: The double exhaust pipe for the internal combustion engine consists of the outer pipe 10 and the inner pipe 20 each of which has one end fixed and the other end slidably supported by the seal member 30 between the outer pipe 10 and the inner pipe 20. The double exhaust pipe manufacturing method comprises mounting the seal member 30 between the inner peripheral face of the outer pipe 10 and the outer peripheral face of the inner pipe 20 and then compressing the outer pipe 10 to compress the seal member 30 until its outer diameter is a predetermined one. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は内燃機関のニ重排気管の製造方法に関する。   The present invention relates to a method for manufacturing a double exhaust pipe of an internal combustion engine.

内燃機関の排気通路では、例えば特許文献１に記載されるように、一方の管（以下、外管という）の内部に他方の管（以下、内管という）が配設されたニ重排気管が用いられることがある。こうしたニ重排気管では、両管の一端を溶接等によってそれぞれ固定しているため、管が加熱された際に軸方向への熱変形を許容できるように、両管の他端を固定しないようにしている。具体的には、図３に示されるように、外管１及び内管２０の図示しない一端を固定した後に、外管１の内周面と内管２０の外周面との間に例えばワイヤメッシュ３などのシール部材を圧縮状態となるように挿入することにより、管の他端のスライドを許容するとともに、両管の間をシールするようにしている。
特開平６−３３６９２１ In an exhaust passage of an internal combustion engine, for example, as described in Patent Document 1, a double exhaust pipe in which the other pipe (hereinafter referred to as an inner pipe) is disposed inside one pipe (hereinafter referred to as an outer pipe). May be used. In such a double exhaust pipe, one end of both pipes is fixed by welding or the like, so that the other ends of both pipes are not fixed so that thermal deformation in the axial direction can be allowed when the pipe is heated. I have to. Specifically, as shown in FIG. 3, for example, a wire mesh is formed between the inner peripheral surface of the outer tube 1 and the outer peripheral surface of the inner tube 20 after fixing one end (not shown) of the outer tube 1 and the inner tube 20. By inserting a sealing member such as 3 so as to be in a compressed state, the other end of the pipe is allowed to slide and the gap between the two pipes is sealed.
JP-A-6-336921

ところで、外管１の内径や内管２０の外径には管の製造段階における公差があるため、外管１の内周面と内管２０の外周面との間隔には個体差が生じることとなる。このため、外管１の内周面と内管２０の外周面との間隔がワイヤメッシュ３の厚さの規格値よりも大きい場合には、挿入されたワイヤメッシュ３の圧縮度合が小さくなるため、両管１，２０とワイヤメッシュ３との面圧が設計値よりも低くなってしまう。反対に、外管１の内周面と内管２０の外周面との間隔がワイヤメッシュ３の厚さの規格値よりも小さい場合には、挿入されたワイヤメッシュ３の圧縮度合が大きくなるため、両管１，２０とワイヤメッシュ３との面圧が設定値よりも大きくなってしまう。更にこの場合、ワイヤメッシュ３の厚さに対して上記間隔が小さすぎる場合には、取り付けの際にワイヤメッシュ３が捲れ上がってしまうこともある。したがって、ワイヤメッシュ３が良好なスライド性やシール性を発揮することができないおそれがある。   By the way, since there is a tolerance in the manufacturing stage of the tube in the inner diameter of the outer tube 1 and the outer diameter of the inner tube 20, individual differences occur in the interval between the inner peripheral surface of the outer tube 1 and the outer peripheral surface of the inner tube 20. It becomes. For this reason, when the space | interval of the inner peripheral surface of the outer tube | pipe 1 and the outer peripheral surface of the inner tube | pipe 20 is larger than the standard value of the thickness of the wire mesh 3, the compression degree of the inserted wire mesh 3 becomes small. The surface pressure between the tubes 1 and 20 and the wire mesh 3 becomes lower than the design value. On the contrary, when the distance between the inner peripheral surface of the outer tube 1 and the outer peripheral surface of the inner tube 20 is smaller than the standard value of the thickness of the wire mesh 3, the degree of compression of the inserted wire mesh 3 increases. The surface pressure between the tubes 1 and 20 and the wire mesh 3 becomes larger than the set value. Furthermore, in this case, if the distance is too small with respect to the thickness of the wire mesh 3, the wire mesh 3 may be rolled up during attachment. Therefore, there exists a possibility that the wire mesh 3 cannot exhibit favorable slidability and sealing performance.

なお、こうした問題は上述したワイヤメッシュに限られるものではなく、外管及び内管の一端が固定され、これらの他端がスライド可能となるように、外管の内周面と内管の外周面との間にシール部材を取り付ける内燃機関のニ重排気管の製造過程においては概ね共通したものとなっている。   These problems are not limited to the wire mesh described above, and the outer peripheral surface of the outer tube and the outer periphery of the inner tube are fixed so that one end of the outer tube and the inner tube can be fixed and the other end can be slid. In the manufacturing process of the double exhaust pipe of the internal combustion engine in which the seal member is attached between the surface and the surface, it is generally common.

本発明は、こうした実情に鑑みてなされたものであって、その目的は、外管と内管との間にシール部材を容易に取り付けることができるとともに、外管及び内管とシール部材との面圧を容易に制御することのできる内燃機関のニ重排気管の製造方法を提供することにある。   The present invention has been made in view of such circumstances, and its purpose is to easily attach a seal member between the outer tube and the inner tube, and to connect the outer tube, the inner tube and the seal member. An object of the present invention is to provide a method for manufacturing a double exhaust pipe of an internal combustion engine in which the surface pressure can be easily controlled.

以下、上記目的を解決するための手段及びその作用効果について記載する。
請求項１に記載の発明は、外管及び内管の一端が固定され、同外管と同内管との間のシール部材によってこれらの管の他端がスライド可能に支持される内燃機関のニ重排気管の製造方法において、前記シール部材を前記外管の内周面と前記内管の外周面との間に取り付けた後に、同外管を圧縮して同シール部材を所定の外径まで圧縮させることをその要旨とする。 Hereinafter, means for solving the above-described object and its operation and effects will be described.
The invention according to claim 1 is an internal combustion engine in which one end of an outer tube and an inner tube is fixed, and the other end of these tubes is slidably supported by a seal member between the outer tube and the inner tube. In the method of manufacturing the double exhaust pipe, after the seal member is attached between the inner peripheral surface of the outer pipe and the outer peripheral face of the inner pipe, the outer pipe is compressed to make the seal member a predetermined outer diameter. The gist of this is to make it compress.

上記構成によれば、外管の内周面と内管の外周面との間にシール部材を挿入した後に、外管を圧縮してシール部材を所定の外径まで圧縮させるため、シール部材の取り付け時には外管の内周面と内管の外周面との間隔を大きくしておくことができる。その結果、シール部材の取り付けが容易となるとともに、外管、内管、及びシール部材の公差を外管の圧縮時に吸収することができるため、外管及び内管とシール部材との面圧を容易に制御することができる。   According to the above configuration, after the seal member is inserted between the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube, the outer tube is compressed to compress the seal member to a predetermined outer diameter. At the time of attachment, the interval between the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube can be increased. As a result, the seal member can be easily attached, and tolerances of the outer tube, the inner tube, and the seal member can be absorbed when the outer tube is compressed, so that the surface pressure between the outer tube and the inner tube and the seal member can be reduced. It can be controlled easily.

具体的には、へら絞り加工により外管の圧縮を行うといった方法を採用することができる。この場合、へら絞り加工は寸法精度を高くすることが可能であるため、外管をへら絞り加工にて縮径させることにより、シール部材の圧縮度合、すなわち、シール部材のスライド性及びシール性を細かく調整することができる。   Specifically, a method of compressing the outer tube by spatula drawing can be employed. In this case, since the squeezing process can increase the dimensional accuracy, the degree of compression of the seal member, that is, the slidability and sealability of the seal member can be improved by reducing the diameter of the outer tube by the spatula process. Can be finely adjusted.

請求項３に記載の発明は、請求項１または請求項２に記載の発明において、前記内管の外周面に前記シール部材が取り付けられた状態でのシール部材の厚さを予め測定し、同測定の結果に応じて前記外管の圧縮度合を調整することをその要旨とする。   According to a third aspect of the present invention, in the first or second aspect of the invention, the thickness of the seal member in a state where the seal member is attached to the outer peripheral surface of the inner tube is measured in advance. The gist is to adjust the degree of compression of the outer tube according to the measurement result.

上記構成によれば、内管の外周面にシール部材が取り付けられた状態でのシール部材の厚さを予め測定し、この測定結果に応じて外管を圧縮する際の圧縮度合を調整する。このため、シール部材に作用する圧縮力を正確に調整することができ、両管の間のスライド性やシール性を向上させることができる。   According to the said structure, the thickness of the sealing member in the state by which the sealing member was attached to the outer peripheral surface of the inner pipe is measured previously, and the compression degree at the time of compressing an outer pipe | tube is adjusted according to this measurement result. For this reason, the compressive force which acts on a sealing member can be adjusted correctly, and the slidability between both pipes and a sealing performance can be improved.

高い耐熱性が要求されるなどの理由から、内燃機関のニ重排気管のシール部材としてワイヤメッシュが採用されることが多い。しかし、ワイヤメッシュは弾力性がそれほど高くないため、外管と内管との間に取り付けて圧縮したときにその面圧を所望の値にすることが困難である。また、外管と内管との間にワイヤメッシュを挿入する際に、ワイヤメッシュが捲れ上がってしまうこともある。   For reasons such as high heat resistance being required, a wire mesh is often employed as a seal member for a double exhaust pipe of an internal combustion engine. However, since the wire mesh is not so elastic, it is difficult to set the surface pressure to a desired value when the wire mesh is compressed between the outer tube and the inner tube. Further, when the wire mesh is inserted between the outer tube and the inner tube, the wire mesh may be rolled up.

この点、本発明によれば、シール部材に金属細線からなる綿を成形したワイヤメッシュを採用した場合であっても、シール部材を容易に取り付けることができるとともに、シール部材の面圧を所望の値に制御することが容易となる。   In this regard, according to the present invention, the seal member can be easily attached and the surface pressure of the seal member can be set to a desired value even when a wire mesh formed of fine metal wire is used as the seal member. It becomes easy to control to the value.

以下、本発明の一実施形態にかかる内燃機関のニ重排気管の製造方法を、二重排気管を備えた触媒コンバータの製造方法に具体化したものについて、図１及び図２を参照して詳細に説明する。   Hereinafter, a method for manufacturing a double exhaust pipe for an internal combustion engine according to an embodiment of the present invention is embodied in a method for manufacturing a catalytic converter having a double exhaust pipe, with reference to FIGS. 1 and 2. This will be described in detail.

図１は本実施形態における二重排気管を備えた触媒コンバータの縦断面構造を示している。なお図１は、後述するへら絞り加工により外管１０を圧縮させる前のニ重排気管の状態を示している。   FIG. 1 shows a longitudinal sectional structure of a catalytic converter provided with a double exhaust pipe in the present embodiment. FIG. 1 shows a state of the double exhaust pipe before the outer pipe 10 is compressed by a spatula drawing process to be described later.

図１に示されるように、触媒コンバータのニ重排気管は、外管１０、内管２０、及びワイヤメッシュ３０を備えている。
外管１０は、図示する部分の外径及び内径がそれぞれ一定な管であり、鉄系の金属により形成されている。 As shown in FIG. 1, the double exhaust pipe of the catalytic converter includes an outer pipe 10, an inner pipe 20, and a wire mesh 30.
The outer tube 10 is a tube having a constant outer diameter and inner diameter of the illustrated portion, and is formed of an iron-based metal.

内管２０は、外管１０と平行で外径及び内径がそれぞれ一定な定径部２２と、排気上流側の端部内周面が定径部２２の外周面に溶接されるとともに排気下流方向へ次第に拡径される拡径部２４とを備えている。拡径部２４の下流側には、外径及び内径がそれぞれ一定な端部２４ｅが備えられている。   The inner pipe 20 is parallel to the outer pipe 10 and has a constant diameter portion 22 having a constant outer diameter and inner diameter, and an end inner peripheral surface on the upstream side of the exhaust is welded to an outer peripheral surface of the constant diameter portion 22 and extends in the exhaust downstream direction. And a diameter-expanding portion 24 that gradually increases in diameter. On the downstream side of the enlarged diameter portion 24, an end portion 24e having a constant outer diameter and an inner diameter is provided.

外管１０と内管２０の排気上流側の端部は図示しない固定部に溶接されることにより固定されている。
外管１０の内周面と内管２０の端部２４ｅの外周面との間には、同内周面と同外周面との間をシールするとともに、外管１０及び内管２０が熱変形した際に軸方向に対して互いにスライド可能となるよう支持するためのワイヤメッシュ３０が配設される。ワイヤメッシュ３０は金属の細線によって形成されている。 End portions on the exhaust upstream side of the outer tube 10 and the inner tube 20 are fixed by welding to a fixing portion (not shown).
Between the inner peripheral surface of the outer tube 10 and the outer peripheral surface of the end 24e of the inner tube 20, a seal is provided between the inner peripheral surface and the outer peripheral surface, and the outer tube 10 and the inner tube 20 are thermally deformed. When this is done, a wire mesh 30 is provided so as to be slidable relative to each other in the axial direction. The wire mesh 30 is formed of fine metal wires.

本実施形態では、二重排気管の製造段階において、ワイヤメッシュ３０を内管２０の端部２４ｅの外周面に取り付けた状態でのワイヤメッシュ３０の外径ｄ３ｏａが、外管１０の内径ｄ１ｉａよりも小さい場合、すなわち、外管１０の内周面とワイヤメッシュ３０の外周面との間に隙間が存在する場合について説明する。   In the present embodiment, the outer diameter d3oa of the wire mesh 30 in a state where the wire mesh 30 is attached to the outer peripheral surface of the end 24e of the inner tube 20 in the manufacturing stage of the double exhaust pipe is greater than the inner diameter d1ia of the outer tube 10. Is also small, that is, a case where a gap exists between the inner peripheral surface of the outer tube 10 and the outer peripheral surface of the wire mesh 30 will be described.

この二重排気管は、以下の（１）〜（１０）の順番で製造される。
（１）定径部２２の排気下流側の端部外周面と拡径部２４の排気上流側の端部内周面とを溶接により固定することで内管２０を組み立てる。 This double exhaust pipe is manufactured in the following order (1) to (10).
(1) The inner pipe 20 is assembled by fixing the outer peripheral surface of the downstream end of the constant diameter portion 22 and the inner peripheral surface of the upstream portion of the enlarged diameter portion 24 by welding.

（２）外管１０の中心軸と内管２０の中心軸とを一致させた状態で、外管１０及び内管２０の排気上流側の各端部を図示しない固定部に溶接する。
（３）外管１０について、ワイヤメッシュ３０が取り付けられる部分の内径ｄ１ｉａ及び外径ｄ１ｏａを測定する。そして、その結果から外管１０の厚さΔｄ１を算出する。 (2) With the central axis of the outer tube 10 and the central axis of the inner tube 20 aligned, each end of the outer tube 10 and the inner tube 20 on the exhaust upstream side is welded to a fixed portion (not shown).
(3) For the outer tube 10, the inner diameter d1ia and the outer diameter d1oa of the part to which the wire mesh 30 is attached are measured. Then, the thickness Δd1 of the outer tube 10 is calculated from the result.

（４）端部２４ｅの外径ｄ２ｏａを測定する。
（５）ワイヤメッシュ３０を径方向外側に広げつつ端部２４ｅの外周面に取り付ける。
（６）内管２０の端部２４ｅにワイヤメッシュ３０が取り付けられた状態でのワイヤメッシュ３０の外径ｄ３ｏａを測定する。 (4) The outer diameter d2oa of the end 24e is measured.
(5) The wire mesh 30 is attached to the outer peripheral surface of the end 24e while spreading outward in the radial direction.
(6) The outer diameter d3oa of the wire mesh 30 in a state where the wire mesh 30 is attached to the end 24e of the inner tube 20 is measured.

（７）ワイヤメッシュ３０の外径ｄ３ｏａと内管２０の外径ｄ２ｏａからワイヤメッシュ３０の厚さΔｄ３を算出する。
（８）ワイヤメッシュ３０の厚さΔｄ３に基づいてワイヤメッシュ３０の圧縮目標となるワイヤメッシュ目標厚さΔｄ３ｔを算出する。 (7) The thickness Δd3 of the wire mesh 30 is calculated from the outer diameter d3oa of the wire mesh 30 and the outer diameter d2oa of the inner tube 20.
(8) Based on the thickness Δd3 of the wire mesh 30, a wire mesh target thickness Δd3t that is a compression target of the wire mesh 30 is calculated.

（９）外管１０の外径ｄ１ｏａ及び厚さΔｄ１と、ワイヤメッシュ３０の厚さΔｄ３とワイヤメッシュ目標厚さΔｄ３ｔとに基づいて、外管１０の圧縮目標となる外管目標外径ｄ１ｏｔを算出する。   (9) Based on the outer diameter d1oa and thickness Δd1 of the outer tube 10, the thickness Δd3 of the wire mesh 30, and the target wire mesh thickness Δd3t, the outer tube target outer diameter d1ot that is the compression target of the outer tube 10 is determined. calculate.

（１０）図２に示されるように、へら絞り（スピニング）加工により外管１０の外径ｄ１ｏが外管目標外径ｄ１ｏｔとなるまで外管１０及びワイヤメッシュ３０を圧縮する。具体的には、内管２０の端部２４ｅの内周面に図示しない金型を固定するとともに外管１０及び内管２０を回転させながら、外管１０の外周面に図示しないローラを押し当てる。そして、ローラの軸方向への移動速度及び径方向への送り込み量を適宜調整することにより外管１０の外径ｄ１ｏが外管目標外径ｄ１ｏｔとなるまで外管１０及びワイヤメッシュ３０を圧縮する。   (10) As shown in FIG. 2, the outer tube 10 and the wire mesh 30 are compressed by a spatula drawing (spinning) process until the outer diameter d1o of the outer tube 10 reaches the outer tube target outer diameter d1ot. Specifically, a mold (not shown) is fixed to the inner peripheral surface of the end 24e of the inner tube 20, and a roller (not shown) is pressed against the outer peripheral surface of the outer tube 10 while rotating the outer tube 10 and the inner tube 20. . The outer tube 10 and the wire mesh 30 are compressed until the outer diameter d1o of the outer tube 10 reaches the outer tube target outer diameter d1ot by appropriately adjusting the moving speed in the axial direction of the roller and the feed amount in the radial direction. .

以上説明した本実施形態によれば、以下の作用効果が得られるようになる。
（１）本実施形態によれば、外管１０の内周面と内管２０の外周面との間にワイヤメッシュ３０を挿入した後に、外管１０を圧縮してワイヤメッシュ３０を所定の外径まで圧縮させるため、ワイヤメッシュ３０の取り付け時には外管１０の内周面と内管２０の外周面との間隔を大きくしておくことができる。その結果、ワイヤメッシュ３０の挿入が容易となるとともに、外管１０、内管２０、及びワイヤメッシュ３０に公差を外管１０の圧縮時に吸収することができるため、外管１０及び内管２０とワイヤメッシュ３０との面圧を容易に制御できる。 According to the present embodiment described above, the following operational effects can be obtained.
(1) According to this embodiment, after inserting the wire mesh 30 between the inner peripheral surface of the outer tube 10 and the outer peripheral surface of the inner tube 20, the outer tube 10 is compressed to remove the wire mesh 30 from the predetermined outer surface. Since the wire mesh 30 is attached, the distance between the inner peripheral surface of the outer tube 10 and the outer peripheral surface of the inner tube 20 can be increased. As a result, the wire mesh 30 can be easily inserted, and tolerances can be absorbed in the outer tube 10, the inner tube 20, and the wire mesh 30 when the outer tube 10 is compressed. The surface pressure with the wire mesh 30 can be easily controlled.

（２）へら絞り加工により外管１０の圧縮を行うといった方法を採用している。この場合、へら絞り加工は寸法精度を高くすることが可能であるため、外管１０をへら絞り加工にて縮径させることにより、ワイヤメッシュ３０の圧縮度合、すなわち、ワイヤメッシュ３０のスライド性及びシール性を細かく調整することができる。   (2) A method is adopted in which the outer tube 10 is compressed by spatula drawing. In this case, since the squeezing process can increase the dimensional accuracy, the degree of compression of the wire mesh 30, that is, the slidability of the wire mesh 30, can be reduced by reducing the diameter of the outer tube 10 by the spatula drawing process. Sealability can be finely adjusted.

（３）本実施形態によれば、内管２０の外周面にワイヤメッシュ３０が取り付けられた状態でのワイヤメッシュ３０の厚さΔｄ３を予め測定し、この測定結果に応じて外管１０を圧縮する際の圧縮度合を調整する。このため、ワイヤメッシュ３０に作用する圧縮力を正確に調整することができ、両管１０，２０の間のスライド性やシール性を向上させることができる。   (3) According to the present embodiment, the thickness Δd3 of the wire mesh 30 in a state where the wire mesh 30 is attached to the outer peripheral surface of the inner tube 20 is measured in advance, and the outer tube 10 is compressed according to the measurement result. Adjust the degree of compression. For this reason, the compressive force which acts on the wire mesh 30 can be adjusted correctly, and the slidability between both the pipes 10 and 20 and a sealing performance can be improved.

（４）高い耐熱性が要求されるなどの理由から、内燃機関のニ重排気管のシール部材としてワイヤメッシュ３０が採用されることが多い。しかし、ワイヤメッシュ３０は弾力性がそれほど高くないため、外管１０と内管２０との間に取り付けて圧縮したときにその面圧を所望の値にすることが困難である。また、外管１０と内管２０との間にワイヤメッシュ３０を取り付ける際に、ワイヤメッシュ３０が捲れ上がってしまうこともある。   (4) The wire mesh 30 is often employed as a sealing member for a double exhaust pipe of an internal combustion engine because high heat resistance is required. However, since the wire mesh 30 is not so elastic, it is difficult to set the surface pressure to a desired value when it is compressed between the outer tube 10 and the inner tube 20 and compressed. In addition, when the wire mesh 30 is attached between the outer tube 10 and the inner tube 20, the wire mesh 30 may be rolled up.

この点、本実施形態によれば、シール部材に金属細線からなるワイヤメッシュ３０を採用しているものの、シール部材を容易に取り付けることができるとともに、シール部材の面圧を所望の値に制御することが容易となる。   In this regard, according to the present embodiment, although the wire mesh 30 made of a fine metal wire is adopted as the seal member, the seal member can be easily attached and the surface pressure of the seal member is controlled to a desired value. It becomes easy.

なお、上記実施の形態は、以下のように変更して実施することもできる。
・本実施形態では、シール部材としてワイヤメッシュ３０を採用しているが、この他にも例えば、耐熱性の樹脂等のシール部材を採用してもよい。 In addition, the said embodiment can also be changed and implemented as follows.
-In this embodiment, although the wire mesh 30 is employ | adopted as a sealing member, you may employ | adopt sealing members, such as heat resistant resin, for example besides this.

・本実施形態では、外管１０の外径ｄ１ｏａや内径ｄ１ｉａを測定するとともに、ワイヤメッシュ３０の外径ｄ３ｏａや内管２０の外径ｄ２ｏａから求められるワイヤメッシュ３０の厚さΔｄ３に基づいて外管１０の圧縮度合を調整している。このような管やシール部材の径の測定を省略した場合には、外管やシール部材の圧縮精度は落ちるものの、シール部材の取り付けが容易となるとともに、外管、内管、及びシール部材の公差を外管の圧縮時に吸収することはできる。   In the present embodiment, the outer diameter d1oa and the inner diameter d1ia of the outer tube 10 are measured, and the outer diameter d3oa of the wire mesh 30 and the outer diameter d2oa of the inner tube 20 are determined based on the thickness Δd3 of the wire mesh 30. The degree of compression of the tube 10 is adjusted. When the measurement of the diameter of the pipe or the seal member is omitted, although the compression accuracy of the outer pipe or the seal member is lowered, the seal member can be easily attached and the outer pipe, the inner pipe, and the seal member are not attached. Tolerances can be absorbed when the outer tube is compressed.

・本実施形態では、外管１０及びワイヤメッシュ３０を圧縮する手段としてへら絞り加工を採用しているが、プレス加工等であってもシール部材を所定の外径まで圧縮することができるものであれば他の加工手段であってもよい。   In this embodiment, a spatula drawing process is adopted as a means for compressing the outer tube 10 and the wire mesh 30. However, the seal member can be compressed to a predetermined outer diameter even in a press process or the like. Any other processing means may be used.

・本実施形態では、内燃機関の二重排気管の一例として触媒コンバータについて説明したが、この他にも例えば、マフラー等を構成するニ重排気管の製造方法に対して本発明を適用してもよい。要するに、外管及び内管の一端が固定され、同外管と同内管との間のシール部材によってこれらの管の他端がスライド可能に支持される内燃機関のニ重排気管であれば、本発明を適用することができる。   In the present embodiment, the catalytic converter has been described as an example of a double exhaust pipe of an internal combustion engine. However, for example, the present invention is applied to a method for manufacturing a double exhaust pipe constituting a muffler or the like. Also good. In short, a double exhaust pipe for an internal combustion engine in which one end of the outer pipe and the inner pipe is fixed and the other end of these pipes is slidably supported by a seal member between the outer pipe and the inner pipe. The present invention can be applied.

・本発明では、シール部材を外管の内周面と内管の外周面との間に取り付けた後に、外管を圧縮してシール部材を所定の外径まで圧縮しているが、外管を圧縮する代わりに、内管を拡径加工するようにしてもよい。この場合、外管を加工することよりは加工がしづらいもものの、その場合であっても、シール部材の取り付けが容易になるとともに、外管、内管、及びシール部材の公差を内管の拡径加工時に吸収することができるため、外管及び内管とシール部材との面圧を制御することができる。   In the present invention, after the seal member is attached between the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube, the outer tube is compressed to compress the seal member to a predetermined outer diameter. Instead of compressing the inner tube, the inner tube may be expanded. In this case, although it is more difficult to process than processing the outer tube, even in that case, the seal member can be easily attached and the tolerances of the outer tube, the inner tube, and the seal member can be reduced. Since it can absorb at the time of a diameter expansion process, the surface pressure of an outer tube, an inner tube, and a sealing member is controllable.

本発明の一実施形態にかかる圧縮加工前の二重排気管の断面図。Sectional drawing of the double exhaust pipe before the compression process concerning one Embodiment of this invention. 同実施形態にかかる圧縮加工後の二重排気管の断面図。Sectional drawing of the double exhaust pipe after the compression process concerning the embodiment. 従来の二重排気管の断面図。Sectional drawing of the conventional double exhaust pipe.

符号の説明Explanation of symbols

１，１０…外管、２０…内管、２２…定径部、２４…拡径部、２４ｅ…端部、３，３０…ワイヤメッシュ。   DESCRIPTION OF SYMBOLS 1,10 ... Outer pipe | tube, 20 ... Inner pipe | tube, 22 ... Constant diameter part, 24 ... Expanded diameter part, 24e ... End part, 3,30 ... Wire mesh.

Claims (4)

外管及び内管の一端が固定され、同外管と同内管との間のシール部材によってこれらの管の他端がスライド可能に支持される内燃機関のニ重排気管の製造方法において、
前記シール部材を前記外管の内周面と前記内管の外周面との間に取り付けた後に、同外管を圧縮して同シール部材を所定の外径まで圧縮させる
ことを特徴とする内燃機関のニ重排気管の製造方法。 In the method of manufacturing a double exhaust pipe of an internal combustion engine, one end of the outer pipe and the inner pipe is fixed, and the other end of these pipes is slidably supported by a seal member between the outer pipe and the inner pipe.
After the seal member is attached between the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube, the outer tube is compressed to compress the seal member to a predetermined outer diameter. A method of manufacturing a double exhaust pipe of an engine. 前記外管の圧縮はへら絞り加工により行われる請求項１に記載の内燃機関のニ重排気管の製造方法。   The method for manufacturing a double exhaust pipe of an internal combustion engine according to claim 1, wherein the compression of the outer pipe is performed by a spatula drawing process. 前記内管の外周面に前記シール部材が取り付けられた状態でのシール部材の厚さを予め測定し、同測定の結果に応じて前記外管の圧縮度合を調整する請求項１または２に記載の内燃機関のニ重排気管の製造方法。   The thickness of the seal member in a state where the seal member is attached to the outer peripheral surface of the inner tube is measured in advance, and the compression degree of the outer tube is adjusted according to the result of the measurement. Manufacturing method of a double exhaust pipe of an internal combustion engine. 前記シール部材は金属細線からなる綿を成形したワイヤメッシュである請求項１〜３のいずれかに記載の内燃機関のニ重排気管の製造方法。   The method for manufacturing a double exhaust pipe for an internal combustion engine according to any one of claims 1 to 3, wherein the seal member is a wire mesh formed of cotton made of fine metal wires.
JP2005176833A 2005-06-16 2005-06-16 Method for manufacturing a double exhaust pipe of an internal combustion engine Expired - Fee Related JP4513665B2 (en)

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