JP7128174B2 - Silencer manufacturing method - Google Patents

Silencer manufacturing method Download PDF

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Publication number
JP7128174B2
JP7128174B2 JP2019237225A JP2019237225A JP7128174B2 JP 7128174 B2 JP7128174 B2 JP 7128174B2 JP 2019237225 A JP2019237225 A JP 2019237225A JP 2019237225 A JP2019237225 A JP 2019237225A JP 7128174 B2 JP7128174 B2 JP 7128174B2
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pipe
housing
manufacturing
diameter
cylindrical
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JP2021105377A (en
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隼 多和田
岳広 三浦
友章 谷川
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Futaba Industrial Co Ltd
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Futaba Industrial Co Ltd
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Priority to JP2019237225A priority Critical patent/JP7128174B2/en
Priority to DE102020132440.5A priority patent/DE102020132440A1/en
Priority to CN202011572420.9A priority patent/CN113047937A/en
Publication of JP2021105377A publication Critical patent/JP2021105377A/en
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    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/023—Helmholtz resonators
    • 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
    • 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
    • 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
    • F01N13/185—Mechanical joints the connection being realised by deforming housing, tube, baffle, plate, or parts thereof
    • 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
    • F01N2470/02—Tubes being perforated
    • 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

Description

本開示は、消音器に関する。 The present disclosure relates to silencers.

内燃機関の排気システムにて、排気を筐体内に導入するためのインレットパイプと、外筒内から排気を排出するためのアウトレットパイプと、を備える消音器が用いられている。特許文献１には、筐体の端部をスピニング加工によって縮径することにより、インレットパイプ及びアウトレットパイプと外筒とを固定する消音器が開示されている。 2. Description of the Related Art In an exhaust system of an internal combustion engine, a muffler including an inlet pipe for introducing exhaust into a housing and an outlet pipe for discharging exhaust from the inside of an outer cylinder is used. Patent Literature 1 discloses a muffler in which an inlet pipe, an outlet pipe, and an outer cylinder are fixed by reducing the diameter of an end portion of a housing by spinning.

特開２０００－１３６７２１号公報JP-A-2000-136721

インレットパイプ及びアウトレットパイプ（以下、単にパイプと記載する）をしっかりと固定せずに筐体の端部を縮径すると、パイプが所望の位置からずれて筐体に固定されてしまうおそれがある。筐体内にパイプを保持する部品を配置すると、ずれは抑制できるが、部品点数が増加してしまう。 If the diameter of the end of the housing is reduced without firmly fixing the inlet pipe and the outlet pipe (hereinafter simply referred to as pipes), there is a risk that the pipes will be fixed to the housing out of the desired position. Displacement can be suppressed by arranging a part that holds the pipe inside the housing, but the number of parts increases.

本開示の目的は、消音器のパイプのずれを抑制できる技術を提案することである。 An object of the present disclosure is to propose a technique capable of suppressing displacement of pipes of a muffler.

本開示の一態様は、消音器の製造方法に係る。消音器は、筒状の筐体であって、中央部と、中央部を中心とした両側に配置され中央部よりも径の小さい第１筒部及び第２筒部を備える筐体と、第１筒部に挿入される第１パイプと、第２筒部に挿入される第２パイプと、を備える。本製造方法では、第１筒部に第１パイプが挿入された状態において、縮径加工により筐体に第２筒部を形成することと、第２筒部に第２パイプを挿入することと、を含む。 One aspect of the present disclosure relates to a method of manufacturing a muffler. The muffler is a tubular housing comprising a central portion, a first tubular portion and a second tubular portion arranged on both sides of the central portion and having a smaller diameter than the central portion, and a second tubular portion. A first pipe inserted into the first tubular portion and a second pipe inserted into the second tubular portion are provided. In this manufacturing method, in a state in which the first pipe is inserted into the first tubular portion, the second tubular portion is formed in the housing by diameter reduction processing, and the second pipe is inserted into the second tubular portion. ,including.

このような製造方法であれば、縮径加工により筐体に第２筒部を形成した後に第２筒部に第２パイプを挿入するため、第２パイプを予め筐体の内部に配置してから第２パイプを囲うように縮径する場合と比較して第２パイプの位置がずれにくくなる。その結果、第２パイプのずれが抑制された消音器を製造することができる。またこの製造方法では、縮径中に生じる位置のずれを抑制するために第２パイプを保持する部品を用いる必要がないため、消音器の部品点数の増加を抑制することができる。 With such a manufacturing method, since the second pipe is inserted into the second cylindrical portion after the second cylindrical portion is formed in the housing by diameter reduction processing, the second pipe is arranged inside the housing in advance. The position of the second pipe is less likely to shift compared to the case where the diameter is reduced so as to surround the second pipe. As a result, it is possible to manufacture a muffler in which displacement of the second pipe is suppressed. In addition, in this manufacturing method, since it is not necessary to use a part for holding the second pipe in order to suppress positional deviation that occurs during diameter reduction, it is possible to suppress an increase in the number of parts of the muffler.

上述した製造方法において、さらに、第１パイプと第２パイプとを筐体の内部において連結させることを含んでもよい。このような製造方法であれば、筐体の内部で第１パイプと第２パイプとが連結した消音器を製造することができる。 The manufacturing method described above may further include connecting the first pipe and the second pipe inside the housing. With such a manufacturing method, it is possible to manufacture a muffler in which the first pipe and the second pipe are connected inside the housing.

また上述した製造方法において、第２パイプにおける第２筒部に当接する当接部の径は、第２パイプにおける当接部よりも筐体の内部に位置する挿入部の径よりも大きくてもよい。このような製造方法であれば、当接部の径が挿入部の径よりも大きいため、第２筒部から挿入部を筐体内に挿入でき、かつ、第２筒部に当接部を当接させることができる。 Further, in the manufacturing method described above, even if the diameter of the abutment portion of the second pipe abutting against the second cylindrical portion is larger than the diameter of the insertion portion located inside the housing than the abutment portion of the second pipe. good. With such a manufacturing method, since the diameter of the contact portion is larger than the diameter of the insertion portion, the insertion portion can be inserted into the housing from the second tubular portion, and the contact portion can be brought into contact with the second tubular portion. can be brought into contact.

また上述した製造方法において、第２筒部に第２パイプを挿入した後に、さらに、当接部を拡管して第２筒部に固定することを含んでもよい。このような製造方法であれば、当接部を拡管することにより、第２パイプを第２筒部に強固に固定することができる。 Moreover, in the manufacturing method described above, after inserting the second pipe into the second tubular portion, the contact portion may be further expanded and fixed to the second tubular portion. With such a manufacturing method, the second pipe can be firmly fixed to the second tubular portion by expanding the contact portion.

また上述した製造方法において、第２筒部を形成する前に、さらに、縮径加工により筐体に第１筒部を形成することと、第１筒部に第１パイプを挿入することと、を含んでもよい。このような製造方法であれば、縮径加工により筐体に第１筒部を形成した後に第１筒部に第１パイプを挿入するため、第１パイプを予め筐体の内部に配置してから第１筒部を形成する場合と比較して第１パイプの位置がずれにくくなる。 Further, in the manufacturing method described above, before forming the second cylindrical portion, forming the first cylindrical portion in the housing by diameter reduction processing, inserting the first pipe into the first cylindrical portion, may include With such a manufacturing method, since the first pipe is inserted into the first cylindrical portion after the first cylindrical portion is formed in the housing by diameter reduction, the first pipe is arranged inside the housing in advance. The position of the first pipe is less likely to shift compared to the case where the first cylindrical portion is formed from solid.

本開示の一態様は、消音器であって、筐体と、一対のパイプと、を備える。筐体は、筒状であって、中央部と、中央部を中心とした両側に配置され、中央部よりも径の小さい一対の筒部を備える。一対のパイプは、一対の筒部に挿入される。一対のパイプのうちの少なくとも１つは、一対の筒部の少なくとも１つに当接する当接部の径が、該当接部よりも筐体の内部に位置する挿入部の径よりも大きい。 One aspect of the present disclosure is a silencer comprising a housing and a pair of pipes. The housing has a cylindrical shape and includes a central portion and a pair of cylindrical portions arranged on both sides of the central portion and having a diameter smaller than that of the central portion. A pair of pipes are inserted into a pair of cylinder parts. At least one of the pair of pipes has a contact portion that contacts at least one of the pair of tubular portions with a larger diameter than the insertion portion positioned inside the housing.

このような消音器は、筐体の１つの端部を縮径して筒部を形成した後に、筐体の外部からパイプを挿入して固定することができる。そのため、筐体の内部にパイプを配置した後で筐体を縮径して製造した構成と比較してパイプの位置ずれが抑制される。また、筐体の内部にパイプを保持する部品を備える構成と比較して、部品点数を低減することができる。 Such a muffler can be fixed by inserting a pipe from the outside of the housing after forming a cylindrical portion by reducing the diameter of one end of the housing. Therefore, displacement of the pipe is suppressed compared to a structure in which the housing is manufactured by reducing the diameter of the housing after placing the pipe inside the housing. In addition, the number of parts can be reduced compared to a configuration in which a part for holding the pipe is provided inside the housing.

第１実施形態の消音器の正面図であって、筐体と第１パイプの一部とを断面図として示す図である。It is a front view of the silencer of 1st Embodiment, Comprising: It is a figure which shows a housing|casing and a part of 1st pipe as sectional drawing. 図２Ａ－図２Ｄが、第１実施形態の消音器の製造方法を説明する模式的な正面図である。2A to 2D are schematic front views explaining the method of manufacturing the silencer of the first embodiment. 図３Ａが第２実施形態の消音器を示す模式的な正面図であり、図３Ｂ－図３Ｅが、第２実施形態の消音器の製造方法を説明する模式的な正面図である。FIG. 3A is a schematic front view showing the silencer of the second embodiment, and FIGS. 3B to 3E are schematic front views explaining a method of manufacturing the silencer of the second embodiment. 図４Ａ－図４Ｃが、変形例の消音器を示す模式的な正面図である。4A to 4C are schematic front views showing modified mufflers. 変形例の消音器の正面図であって、筐体と第１パイプの一部とを断面図として示す図である。It is a front view of the silencer of a modification, Comprising: It is a figure which shows a housing|casing and a part of 1st pipe as sectional drawing.

以下に本開示の実施形態を図面と共に説明する。
［１．第１実施形態］
［１－１．消音器の構成］
図１に示される消音器１は、筐体１１と、第１パイプ１２と、第２パイプ１３と、を備える。また消音器１は、ワイヤーメッシュ１４を備えていてもよい。この消音器１は、図示しない内燃機関の排気ガス流路を構成するものであって、例えば別の消音器と同時に用いられてもよい。本実施形態において、筐体１１は、第１パイプ１２及び第２パイプ１３を覆うアウターパイプである。また第１パイプ１２は、排気ガスの流路の下流側に位置するパイプであり、排気ガスを筐体１１から排出するアウトレットパイプである。また第２パイプ１３は、排気ガスの流路の上流側に位置するパイプであり、排気ガスを筐体１１内に導入するインレットパイプである。なお理解を容易にする目的で、図１においては、筐体１１と、第１パイプ１２の上流側端部の一部と、ワイヤーメッシュ１４と、は断面を示されている。 Embodiments of the present disclosure will be described below with reference to the drawings.
[1. First Embodiment]
[1-1. Configuration of silencer]
The muffler 1 shown in FIG. 1 comprises a housing 11, a first pipe 12 and a second pipe 13. As shown in FIG. The muffler 1 may also include a wire mesh 14 . The muffler 1 constitutes an exhaust gas flow path of an internal combustion engine (not shown), and may be used together with another muffler, for example. In this embodiment, the housing 11 is an outer pipe that covers the first pipe 12 and the second pipe 13 . The first pipe 12 is a pipe positioned downstream of the flow path of the exhaust gas, and is an outlet pipe for discharging the exhaust gas from the housing 11 . The second pipe 13 is positioned upstream of the flow path of the exhaust gas, and is an inlet pipe that introduces the exhaust gas into the housing 11 . For the purpose of facilitating understanding, FIG. 1 shows a cross section of the housing 11, part of the upstream end of the first pipe 12, and the wire mesh 14. As shown in FIG.

筐体１１は、全体として筒状である金属製の部材である。筐体１１は、中央部２１と、該中央部２１を中心とした両側に配置される第１筒部２２及び第２筒部２３を備える。第１筒部２２は中央部２１よりも下流側に配置され、第２筒部２３は中央部２１よりも上流側に配置される。第１筒部２２及び第２筒部２３の径は、中央部２１の径よりも小さく形成されている。中央部２１と第１筒部２２の間には下流ほど徐々に径が小さくなる第１テーパ部２４が形成されている。また、中央部２１と第２筒部２３の間には、下流ほど徐々に径が大きくなる第２テーパ部２５が形成されている。 The housing 11 is a metal member having a tubular shape as a whole. The housing 11 includes a central portion 21 and a first tubular portion 22 and a second tubular portion 23 arranged on both sides of the central portion 21 . The first tubular portion 22 is arranged downstream of the central portion 21 , and the second tubular portion 23 is arranged upstream of the central portion 21 . The diameters of the first cylindrical portion 22 and the second cylindrical portion 23 are formed smaller than the diameter of the central portion 21 . A first tapered portion 24 is formed between the central portion 21 and the first cylindrical portion 22, the diameter of which gradually decreases toward the downstream side. A second tapered portion 25 is formed between the central portion 21 and the second tubular portion 23, the diameter of which gradually increases toward the downstream side.

第１パイプ１２は、筐体１１の内部に配置される金属製のパイプである。第１パイプ１２の一部は筐体１１の外部に配置されていてもよい。第１パイプ１２は、第１主管部３１と、第１副管部３２と、第１接続部３３と、を含む。
第１主管部３１は、円筒状である。第１主管部３１の周壁には、排気ガスが移動可能な複数の貫通孔３４が形成されている。第１主管部３１の下流側に位置する部分である第１当接部３１ａは、第１筒部２２に当接して固定されている。第１当接部３１ａは第１主管部３１の下流側の端部であってもよいし、その端部から間隔を開けた位置にある部分であってもよい。 The first pipe 12 is a metal pipe arranged inside the housing 11 . A portion of the first pipe 12 may be arranged outside the housing 11 . The first pipe 12 includes a first main pipe portion 31 , a first sub pipe portion 32 and a first connection portion 33 .
The first main pipe portion 31 is cylindrical. A plurality of through holes 34 through which the exhaust gas can move are formed in the peripheral wall of the first main pipe portion 31 . A first contact portion 31 a , which is a portion located on the downstream side of the first main pipe portion 31 , is fixed in contact with the first cylinder portion 22 . The first contact portion 31a may be the downstream end portion of the first main pipe portion 31, or may be a portion spaced apart from the end portion.

第１副管部３２は第１主管部３１よりも上流側に位置する円筒状の部分である。第１副管部３２は第１主管部３１よりも径が大きい。第１副管部３２の上流側の端部３２ａは、フレア加工により僅かに拡径している。第１接続部３３は、第１主管部３１と第１副管部３２とを接続する円筒状の部材であり、第１副管部３２から第１主管部３１に向かって徐々に径が小さくなっている。なおフレア加工とは、先端に向かうに従って断面が曲線的に拡径する加工である。なお、端部３２ａは、テーパ状や階段状に拡径するように加工されていてもよい。 The first secondary pipe portion 32 is a cylindrical portion located upstream of the first main pipe portion 31 . The first secondary pipe portion 32 has a larger diameter than the first main pipe portion 31 . An upstream end portion 32a of the first sub pipe portion 32 is slightly enlarged in diameter by flaring. The first connection portion 33 is a cylindrical member that connects the first main pipe portion 31 and the first sub pipe portion 32 , and the diameter gradually decreases from the first sub pipe portion 32 toward the first main pipe portion 31 . It's becoming The flaring process is a process in which the cross-section increases in diameter in a curved line toward the tip. The end portion 32a may be processed so as to expand in a tapered shape or a stepped shape.

第２パイプ１３は、筐体１１の内部に配置される金属製のパイプである。第２パイプ１３の一部は筐体１１の外部に配置されていてもよい。第２パイプ１３は、挿入部４１と、第２当接部４２と、第２接続部４３と、を含む。 The second pipe 13 is a metal pipe arranged inside the housing 11 . A portion of the second pipe 13 may be arranged outside the housing 11 . The second pipe 13 includes an insertion portion 41 , a second contact portion 42 and a second connection portion 43 .

挿入部４１は、円筒状である。挿入部４１の周壁には、排気ガスが移動可能な複数の貫通孔４４が形成されている。挿入部４１の下流側の端部は、第１パイプ１２の第１副管部３２に挿入されている。また挿入部４１における第１副管部３２に挿入される部分には、挿入部４１を周方向に囲うようにワイヤーメッシュ１４が配置されている。ワイヤーメッシュ１４は、糸状の金属を織って、或いは織らずに絡み合わせて形成されたものである。ワイヤーメッシュ１４は、厚みを有する帯状の部材であり、弾性変形する。ワイヤーメッシュ１４は、挿入部４１の外周面と第１副管部３２の内周面との間で圧縮された状態となっている。第１副管部３２の上流側端部と挿入部４１の下流側端部とは固定されていない。 The insertion portion 41 is cylindrical. A plurality of through holes 44 through which the exhaust gas can move are formed in the peripheral wall of the insertion portion 41 . A downstream end of the insertion portion 41 is inserted into the first sub-pipe portion 32 of the first pipe 12 . A wire mesh 14 is arranged in a portion of the insertion portion 41 to be inserted into the first secondary pipe portion 32 so as to surround the insertion portion 41 in the circumferential direction. The wire mesh 14 is formed by weaving or intertwining thread-like metals without weaving. The wire mesh 14 is a belt-shaped member having thickness and is elastically deformed. The wire mesh 14 is in a compressed state between the outer peripheral surface of the insertion portion 41 and the inner peripheral surface of the first secondary pipe portion 32 . The upstream end of the first sub pipe portion 32 and the downstream end of the insertion portion 41 are not fixed.

第２当接部４２は挿入部４１よりも上流側に位置する円筒状の部材である。第２当接部４２は挿入部４１よりも径が大きい。第２当接部４２は第２筒部２３に当接し固定されている。第２接続部４３は、挿入部４１と第２当接部４２とを接続する円筒状の部材であり、第２当接部４２から挿入部４１に向かって徐々に径が小さくなっている。 The second contact portion 42 is a cylindrical member located upstream of the insertion portion 41 . The second contact portion 42 has a larger diameter than the insertion portion 41 . The second contact portion 42 is fixed in contact with the second tubular portion 23 . The second connection portion 43 is a cylindrical member that connects the insertion portion 41 and the second contact portion 42 , and the diameter gradually decreases from the second contact portion 42 toward the insertion portion 41 .

このように構成された消音器１において、排気ガスは第２当接部４２から筐体１１内に進入して矢印Ｆの方向に流れ、第１当接部３１ａを通って排出される。このような構造の消音器１は、排気ガスの圧力と温度とを低下させる。 In the muffler 1 configured as described above, the exhaust gas enters the housing 11 from the second contact portion 42, flows in the direction of the arrow F, and is discharged through the first contact portion 31a. The muffler 1 having such a structure reduces the pressure and temperature of the exhaust gas.

［１－２．消音器の製造方法］
上述した消音器１の製造方法を、図２Ａ－２Ｄを用いて説明する。図２Ａ－２Ｄは模式的な図であるため、詳細な形状が図１とは相違する場合がある。以下の説明において、下流方向とは図２Ａにおける矢印Ａの方向であり、上流から下流に向かう方向である。また上流方向は、下流方向とは反対の方向である。 [1-2. Manufacturing method of silencer]
A method of manufacturing the silencer 1 described above will now be described with reference to FIGS. 2A-2D. Since FIGS. 2A-2D are schematic diagrams, the detailed shape may differ from that of FIG. In the following description, the downstream direction is the direction of arrow A in FIG. 2A, which is the direction from upstream to downstream. The upstream direction is the direction opposite to the downstream direction.

図２Ａに示されるように、まず、円筒状の筐体１１の下流方向の端部を縮径加工して、該端部に第１筒部２２を形成する。縮径加工とは、筒状の部材を半径方向に縮小し、その周囲よりも径の小さい筒状とすることを意味する。以下、縮径加工を単に縮径とも記載する。縮径は、例えばスピニング加工により実現することができるが、プレス加工などの他の加工手法により実現してもよい。 As shown in FIG. 2A, first, the downstream end of the cylindrical casing 11 is diameter-reduced to form the first cylindrical portion 22 at the end. The diameter reduction process means to radially reduce a cylindrical member to have a cylindrical shape with a smaller diameter than its surroundings. Hereinafter, diameter reduction processing is also simply referred to as diameter reduction. The diameter reduction can be achieved, for example, by spinning, but may be achieved by other processing techniques such as press working.

図２Ｂに示されるように、続いて、筐体１１の上流方向の開口から第１パイプ１２を筐体１１の内部に進入させ、第１パイプ１２を第１筒部２２に挿入する。第１パイプ１２の第１主管部３１のうち、第１当接部３１ａが第１筒部２２に挿入され当接する。このとき、第１筒部２２と第１パイプ１２とを固定してもよい。固定の方法は特に限定されず、例えば、圧入、溶接、及び第１当接部３１ａの拡管のうちの１つ以上を行うことにより固定を実現してもよい。圧入を行う場合は、圧入装置を用いて行ってもよい。また圧入を実現するために、第１主管部３１のうち少なくとも第１当接部３１ａの外径が第１筒部２２の内径よりも僅かに大きく形成されていてもよい。第１当接部３１ａの拡管を行う場合は、第１主管部３１を第１筒部２２に挿入した後に、第１当接部３１ａを拡管してもよい。なお、第１主管部３１と第１筒部２２との固定は、図２Ｂで示す挿入工程の後に行ってもよいし、これ以降の工程の後に行ってもよい。 Next, as shown in FIG. 2B , the first pipe 12 is inserted into the housing 11 through the upstream opening of the housing 11 and inserted into the first cylindrical portion 22 . A first contact portion 31 a of the first main pipe portion 31 of the first pipe 12 is inserted into and contacts the first cylinder portion 22 . At this time, the first tubular portion 22 and the first pipe 12 may be fixed. The fixing method is not particularly limited, and for example, fixing may be realized by performing one or more of press fitting, welding, and tube expansion of the first contact portion 31a. When press-fitting, a press-fitting device may be used. In order to achieve press-fitting, at least the first contact portion 31a of the first main pipe portion 31 may have an outer diameter slightly larger than the inner diameter of the first tubular portion 22 . When the first contact portion 31a is expanded, the first contact portion 31a may be expanded after the first main pipe portion 31 is inserted into the first tubular portion 22 . The fixing of the first main pipe portion 31 and the first cylindrical portion 22 may be performed after the insertion step shown in FIG. 2B, or after the subsequent steps.

図２Ｃに示されるように、続いて、第１筒部２２に第１パイプ１２が挿入された状態において、筐体１１の上流方向の端部を縮径して、該端部に第２筒部２３を形成する。
図２Ｄに示されるように、続いて、筐体１１の上流方向の外側から第２筒部２３に第２パイプ１３を挿入する。第２パイプ１３の挿入部４１は第２筒部２３を通過し、第２当接部４２が第２筒部２３に当接する。また挿入に伴って第２パイプ１３と第２筒部２３との固定が行われてもよい。第２パイプ１３の挿入及び固定は、図２Ｂに示した第１パイプ１２の第１筒部２２への挿入及び固定と同様の手法を用いることができる。 Next, as shown in FIG. 2C, in a state where the first pipe 12 is inserted into the first cylindrical portion 22, the upstream end of the housing 11 is reduced in diameter, and the second pipe is attached to the end. forming part 23;
Next, as shown in FIG. 2D, the second pipe 13 is inserted into the second cylindrical portion 23 from the outside of the housing 11 in the upstream direction. The insertion portion 41 of the second pipe 13 passes through the second cylindrical portion 23 and the second contact portion 42 contacts the second cylindrical portion 23 . Further, the fixing between the second pipe 13 and the second cylindrical portion 23 may be performed along with the insertion. The insertion and fixation of the second pipe 13 can be performed using the same technique as the insertion and fixation of the first pipe 12 into the first cylindrical portion 22 shown in FIG. 2B.

また、第２パイプ１３の第２筒部２３への挿入に伴って、第１パイプ１２と第２パイプ１３とを筐体１１の内部において連結させる。挿入部４１は、ワイヤーメッシュ１４ごと第１副管部３２に挿入される。ワイヤーメッシュ１４は第１副管部３２と挿入部４１との間で圧縮された状態となる。以上の工程により、図１に示される消音器１が製造される。 Further, the first pipe 12 and the second pipe 13 are connected inside the housing 11 as the second pipe 13 is inserted into the second cylindrical portion 23 . The insertion portion 41 is inserted into the first secondary pipe portion 32 together with the wire mesh 14 . The wire mesh 14 is in a compressed state between the first sub-tube portion 32 and the insertion portion 41 . Through the above steps, the muffler 1 shown in FIG. 1 is manufactured.

［１－３．効果］
以上詳述した第１実施形態によれば、以下の効果が得られる。
（１ａ）上述した消音器１の製造方法では、筐体１１の端部を縮径して第２筒部２３を形成した後に第２パイプ１３を第２筒部２３に挿入する。そのため、第２パイプ１３を予め筐体の内部に配置してから第２パイプ１３を囲うように筐体を縮径する従来の製造方法と比較して、第２パイプ１３の位置がずれにくくなる。その結果、製造された消音器において、第２パイプの位置のずれを抑制できる。また従来の製造方法と比較して、筐体の縮径による第２パイプの位置ずれを抑制するために第２パイプを保持する部品を用いる必要がないため、消音器の部品点数の増加を抑制することができる。 [1-3. effect]
According to the first embodiment detailed above, the following effects are obtained.
(1a) In the method of manufacturing the muffler 1 described above, the second pipe 13 is inserted into the second tubular portion 23 after the diameter of the end portion of the housing 11 is reduced to form the second tubular portion 23 . Therefore, compared to the conventional manufacturing method in which the second pipe 13 is arranged inside the housing in advance and then the diameter of the housing is reduced so as to surround the second pipe 13, the position of the second pipe 13 is less likely to shift. . As a result, displacement of the second pipe can be suppressed in the manufactured muffler. In addition, compared to the conventional manufacturing method, since it is not necessary to use a part to hold the second pipe in order to suppress the displacement of the second pipe due to the diameter reduction of the housing, an increase in the number of parts of the muffler is suppressed. can do.

（１ｂ）上述した消音器１は、第１パイプ１２と第２パイプ１３とが筐体１１の内部において連結されている。そのため、第１パイプ１２と第２パイプ１３とが連結した消音器１を製造することができる。また、第１パイプ１２と第２パイプ１３とはワイヤーメッシュ１４を介して摺動可能に連結されているため、排気ガスの熱に起因する膨張や収縮が生じたときには軸方向の伸縮が可能である。その結果、第１パイプ１２及び第２パイプ１３に過剰な負荷が加わることがなく、座屈の発生を抑制できる。 (1b) In the silencer 1 described above, the first pipe 12 and the second pipe 13 are connected inside the housing 11 . Therefore, the muffler 1 in which the first pipe 12 and the second pipe 13 are connected can be manufactured. In addition, since the first pipe 12 and the second pipe 13 are slidably connected via the wire mesh 14, they can expand and contract in the axial direction when expansion or contraction due to the heat of the exhaust gas occurs. be. As a result, excessive load is not applied to the first pipe 12 and the second pipe 13, and buckling can be suppressed.

（１ｃ）上述した消音器１は、第２パイプ１３の第２筒部２３に当接する第２当接部４２の径は、第２当接部４２よりも筐体１１の内部に位置する挿入部４１の径よりも大きい。そのため、第２筒部２３から挿入部４１を筐体１１内に挿入でき、かつ、第２筒部２３に第２当接部４２を当接させることができる。 (1c) In the silencer 1 described above, the diameter of the second contact portion 42 that contacts the second cylindrical portion 23 of the second pipe 13 is positioned inside the housing 11 rather than the second contact portion 42 . It is larger than the diameter of the portion 41 . Therefore, the insertion portion 41 can be inserted from the second cylindrical portion 23 into the housing 11 and the second contact portion 42 can be brought into contact with the second cylindrical portion 23 .

（１ｄ）上述した消音器１の製造方法では、第２筒部２３を形成する前に、筐体１１の下流方向の端部を縮径して第１筒部２２を形成し、第１筒部２２に第１パイプ１２を挿入する。このような製造方法であれば、第１筒部２２を形成した後に第１パイプ１２を挿入するため、第１パイプ１２を予め筐体１１の内部に配置してから第１パイプ１２を囲うように第１筒部２２を形成する場合と比較して、第１パイプ１２の位置がずれにくくなる。 (1d) In the method of manufacturing the muffler 1 described above, before forming the second cylindrical portion 23, the downstream end of the housing 11 is reduced in diameter to form the first cylindrical portion 22, and the first cylindrical portion 22 is formed. The first pipe 12 is inserted into the portion 22 . In such a manufacturing method, since the first pipe 12 is inserted after forming the first tubular portion 22, the first pipe 12 is arranged inside the housing 11 in advance and then the first pipe 12 is surrounded. As compared with the case where the first cylindrical portion 22 is formed at the center, the position of the first pipe 12 is less likely to shift.

（１ｅ）上述した消音器１の製造方法では、第２筒部２３に第２パイプ１３を挿入した後に、さらに、第２当接部４２を拡管して第２筒部２３に固定することができる。このように固定を行った場合、第２パイプ１３を第２筒部２３に強固に固定することができる。 (1e) In the method of manufacturing the silencer 1 described above, after the second pipe 13 is inserted into the second cylindrical portion 23, the second contact portion 42 may be further expanded and fixed to the second cylindrical portion 23. can. When fixed in this way, the second pipe 13 can be firmly fixed to the second cylindrical portion 23 .

［２．第２実施形態］
第２実施形態について、第１実施形態と相違点を中心に以下に説明する。なお第１実施形態にて説明した、機能や作用を実現するための構造及び製造方法の詳細や変形例は、第２実施形態においても適用可能である。 [2. Second Embodiment]
The second embodiment will be described below, focusing on differences from the first embodiment. The details and modifications of the structure and manufacturing method for realizing the functions and actions described in the first embodiment can also be applied to the second embodiment.

本実施形態では、インレットパイプが第１パイプに相当し、アウトレットパイプが第２パイプに相当する。また、筐体の上流方向の端部に第１筒部が形成され、下流方向の端部に第２筒部１２３が形成される。 In this embodiment, the inlet pipe corresponds to the first pipe, and the outlet pipe corresponds to the second pipe. In addition, a first tubular portion is formed at the upstream end of the housing, and a second tubular portion 123 is formed at the downstream end.

［２－１．消音器の構成］
図３Ａに示される消音器１０１は、筐体１１１と、第１パイプ１１２と、第２パイプ１１３と、を備える。さらにワイヤーメッシュ１４を備えていてもよい。 [2-1. Configuration of silencer]
The muffler 101 shown in FIG. 3A comprises a housing 111, a first pipe 112 and a second pipe 113. As shown in FIG. Furthermore, a wire mesh 14 may be provided.

筐体１１１は、全体として筒状である金属製の部材である。筐体１１１は、中央部１２１と、該中央部１２１を中心とした両側に配置される第１筒部１２２及び第２筒部１２３を備える。第１筒部１２２は中央部１２１よりも上流側に配置され、第２筒部１２３は中央部１２１よりも下流側に配置される。第１筒部１２２及び第２筒部１２３の径は、中央部１２１の径よりも小さく形成されている。 The housing 111 is a metal member having a tubular shape as a whole. The housing 111 includes a central portion 121 and a first tubular portion 122 and a second tubular portion 123 arranged on both sides of the central portion 121 . The first tubular portion 122 is arranged upstream of the central portion 121 , and the second tubular portion 123 is arranged downstream of the central portion 121 . The diameters of the first cylindrical portion 122 and the second cylindrical portion 123 are formed smaller than the diameter of the central portion 121 .

第１パイプ１１２は、筐体１１１の内部に配置される金属製のパイプである。第１パイプ１１２の一部は筐体１１１の外部に配置されていてもよい。第１パイプ１１２は、軸方向に関して均一な径の円筒である。第１パイプ１１２の下流側の端部の近傍には、第１パイプ１１２を周方向に囲うようにワイヤーメッシュ１４が配置されている。第１パイプ１１２の下流側の端部は挿入部１３１に挿入されている。ワイヤーメッシュ１４は、第１パイプ１１２の外周面と挿入部１３１の内周面とに圧縮された状態となっている。第１パイプ１１２の下流側の第１当接部１１２ａは第１筒部１２２に当接して固定されている。 The first pipe 112 is a metal pipe arranged inside the housing 111 . A portion of the first pipe 112 may be arranged outside the housing 111 . The first pipe 112 is a cylinder with a uniform diameter in the axial direction. A wire mesh 14 is arranged near the downstream end of the first pipe 112 so as to surround the first pipe 112 in the circumferential direction. A downstream end of the first pipe 112 is inserted into the insertion portion 131 . The wire mesh 14 is compressed between the outer peripheral surface of the first pipe 112 and the inner peripheral surface of the insertion portion 131 . A first contact portion 112 a on the downstream side of the first pipe 112 contacts and is fixed to the first cylindrical portion 122 .

第２パイプ１１３は、筐体１１１の内部に配置される金属製のパイプである。第２パイプ１１３の一部は筐体１１１の外部に配置されていてもよい。第２パイプ１１３は、挿入部１３１と、第２当接部１３２と、第１接続部１３３と、を含む。第２当接部１３２は挿入部１３１よりも下流側に位置する円筒状の部材である。第２当接部１３２は挿入部１３１よりも径が大きい。挿入部１３１の上流側の端部１３１ａは、フレア加工により僅かに拡径している。第２当接部１３２は第２筒部１２３に当接して固定されている。 The second pipe 113 is a metal pipe arranged inside the housing 111 . A portion of the second pipe 113 may be arranged outside the housing 111 . The second pipe 113 includes an insertion portion 131 , a second contact portion 132 and a first connection portion 133 . The second contact portion 132 is a cylindrical member located downstream of the insertion portion 131 . The second contact portion 132 has a larger diameter than the insertion portion 131 . An upstream end portion 131a of the insertion portion 131 is slightly enlarged in diameter by flaring. The second contact portion 132 is fixed in contact with the second tubular portion 123 .

［２－２．消音器の製造方法］
上述した消音器１０１の製造方法を、図３Ｂ－３Ｅを用いて説明する。
図３Ｂに示されるように、まず、円筒状の筐体１１１の上流方向の端部を縮径して、該端部に第２筒部１２３を形成する。 [2-2. Manufacturing method of silencer]
A method of manufacturing the muffler 101 described above will now be described with reference to FIGS. 3B-3E.
As shown in FIG. 3B, first, the diameter of the upstream end of the cylindrical housing 111 is reduced to form the second cylindrical portion 123 at the end.

図３Ｃに示されるように、続いて、筐体１１１の下流方向の開口から第１パイプ１１２を筐体１１１の内部に進入させ、第１パイプ１１２を第１筒部１２２に挿入する。第１実施形態と同様に、挿入に伴って第１パイプ１１２と第１筒部１２２との固定が行われてもよい。第１当接部１１２ａと第１筒部１２２との固定方法や固定のタイミングは特に限定されない。 Subsequently, as shown in FIG. 3C , the first pipe 112 is inserted into the housing 111 through the downstream opening of the housing 111 and inserted into the first cylindrical portion 122 . As in the first embodiment, the first pipe 112 and the first cylindrical portion 122 may be fixed together with the insertion. The fixing method and fixing timing between the first contact portion 112a and the first tubular portion 122 are not particularly limited.

図３Ｄに示されるように、続いて、第１筒部１２２に第１パイプ１１２が固定された状態において、円筒状の筐体１１１の下流方向の端部を縮径して、該端部に第２筒部１２３を形成する。 Subsequently, as shown in FIG. 3D , in a state where the first pipe 112 is fixed to the first cylindrical portion 122, the diameter of the downstream end of the cylindrical casing 111 is reduced, and the end is A second tubular portion 123 is formed.

図３Ｅに示されるように、続いて、筐体１１１の下流方向の外側から第２筒部１２３に第２パイプ１１３を挿入する。挿入部１３１は第２筒部１２３を通過し、第２当接部１３２が第２筒部１２３に当接する。第１実施形態と同様に、挿入に伴って第２パイプ１１３と第２筒部１２３との固定が行われてもよい。第２当接部１３２と第２筒部１２３との固定方法や固定のタイミングは特に限定されない。 Next, as shown in FIG. 3E, the second pipe 113 is inserted into the second tubular portion 123 from the outside of the housing 111 in the downstream direction. The insertion portion 131 passes through the second cylindrical portion 123 and the second contact portion 132 contacts the second cylindrical portion 123 . As in the first embodiment, the second pipe 113 and the second cylindrical portion 123 may be fixed together with the insertion. The fixing method and fixing timing between the second contact portion 132 and the second tubular portion 123 are not particularly limited.

また、第２パイプ１１３の第２筒部１２３への挿入に伴って、第１パイプ１１２と第２パイプ１１３とを筐体１１１の内部において連結させる。第１パイプ１１２は、ワイヤーメッシュ１４ごと第２パイプ１１３に挿入される。ワイヤーメッシュ１４は第２パイプ１１３と挿入部１３１との間で圧縮された状態となる。以上の工程により、図３Ａに示される消音器１０１が製造される。 Further, the first pipe 112 and the second pipe 113 are connected inside the housing 111 as the second pipe 113 is inserted into the second tubular portion 123 . The first pipe 112 is inserted into the second pipe 113 together with the wire mesh 14 . The wire mesh 14 is compressed between the second pipe 113 and the insertion portion 131 . Through the steps described above, the muffler 101 shown in FIG. 3A is manufactured.

［２－３．効果］
以上詳述した第２実施形態によれば、前述した第１実施形態の効果（１ａ）～（１ｅ）と同様の効果を奏することができる。 [2-3. effect]
According to the second embodiment described in detail above, the same effects as the effects (1a) to (1e) of the first embodiment can be obtained.

なお、第２実施形態にて明らかになるように、第１パイプ及び第２パイプは、アウトレットパイプであってもインレットパイプであってもよい。また、筐体内でそれらのパイプが連結する場合には、どちらのパイプが外側に位置していてもよい。なお、図示しないが、アウトレットパイプの上流端部がインレットパイプの下流端部に挿入されて連結する構成であってもよい。 It should be noted that the first pipe and the second pipe may be outlet pipes or inlet pipes, as will be apparent in the second embodiment. Moreover, when those pipes are connected within the housing, either pipe may be located outside. Although not shown, the upstream end of the outlet pipe may be inserted into and connected to the downstream end of the inlet pipe.

［３．その他の実施形態］
以上本開示の実施形態について説明したが、本開示は、上記実施形態に何ら限定されることはなく、本開示の技術的範囲に属する限り種々の形態をとり得ることはいうまでもない。 [3. Other embodiments]
Although the embodiments of the present disclosure have been described above, the present disclosure is by no means limited to the above-described embodiments, and needless to say, can take various forms as long as they fall within the technical scope of the present disclosure.

（３Ａ）上記各実施形態では、第１パイプと第２パイプとが筐体の内部において連結される構成を例示したが、これに限定されるものではない。例えば、図４Ａに示される消音器２０１のように、第１筒部２２２に挿入された第１パイプ２１２と、第２筒部２２３に挿入された第２パイプ２１３と、が連結しない構成としてもよい。この場合、ワイヤーメッシュは不要である。第２パイプ２１３は、筐体１１の内部まで挿入される挿入部２３１の径が第２筒部２３に当接する当接部２３２の径よりも小さい。 (3A) In each of the above-described embodiments, the configuration in which the first pipe and the second pipe are connected inside the housing was exemplified, but the present invention is not limited to this. For example, as in the muffler 201 shown in FIG. 4A, the first pipe 212 inserted into the first tubular portion 222 and the second pipe 213 inserted into the second tubular portion 223 may not be connected. good. In this case, no wire mesh is required. In the second pipe 213 , the diameter of the insertion portion 231 that is inserted to the inside of the housing 11 is smaller than the diameter of the contact portion 232 that contacts the second cylindrical portion 23 .

（３Ｂ）第１パイプ及び第２パイプの具体的な形状は特に限定されない。例えば、図４Ｂに示される消音器３０１のように、第１筒部３２２に挿入された第１パイプ３１２は軸方向に関して同一の径の管であり、第２筒部３２３に挿入された第２パイプ３１３は下流側の端部３３１の径がその他の部分より小さい管であってもよい。 (3B) The specific shapes of the first pipe and the second pipe are not particularly limited. For example, like the muffler 301 shown in FIG. 4B , the first pipe 312 inserted into the first cylindrical portion 322 has the same diameter in the axial direction, and the second pipe 312 inserted into the second cylindrical portion 323 has the same diameter. The pipe 313 may be a tube whose downstream end 331 has a smaller diameter than the rest of the pipe.

また、図示しないが、第１パイプ及び第２パイプのいずれも、筐体に挿入される部分全体において、管の直径が軸方向に変化しない構成であってもよい。なお、筐体に挿入される部分とは、筐体と二重管を構成する部分と言い換えることができる。 Moreover, although not shown, both the first pipe and the second pipe may have a configuration in which the diameter of the pipe does not change in the axial direction over the entire portion inserted into the housing. In addition, the part inserted into the housing can be rephrased as a part constituting the housing and the double tube.

（３Ｃ）図４Ｃに示されるように、筐体４１１は、第１筒部４２２が形成される第１部分４１２と、第２筒部４２３が形成される第２部分４１３と、が溶接などにより接合された構成であってもよい。 (3C) As shown in FIG. 4C, the housing 411 has a first portion 412 formed with a first cylindrical portion 422 and a second portion 413 formed with a second cylindrical portion 423, which are welded together. It may also be a bonded configuration.

（３Ｄ）消音器の構成は上記実施形態にて説明した構成に何ら限定されず、本開示の特徴を有する様々な態様にて消音器を実現できる。例えば、消音器は、上記各実施形態にて説明した構成以外の構成が含まれていてもよいし、一部の構成を取り除いてもよい。図５に示す消音器５０１のように、レゾネスカバー６１が備えられていてもよい。また、筐体に挿入されるパイプのいずれかの位置に流量を調整する図示しないキャップが配置されていてもよい。また貫通孔３４、貫通孔４４は設けられていなくてもよい。 The configuration of the (3D) silencer is not limited to the configuration described in the above embodiment, and the silencer can be realized in various aspects having the features of the present disclosure. For example, the muffler may include configurations other than the configurations described in each of the above embodiments, or part of the configuration may be removed. A resonance cover 61 may be provided like the muffler 501 shown in FIG. Also, a cap (not shown) for adjusting the flow rate may be arranged at any position of the pipe inserted into the housing. Also, the through holes 34 and 44 may not be provided.

また、第１パイプと第２パイプとは、同軸上ではなく、軸がずれて配置されていてもよい。例えば、第１パイプと第２パイプは、それぞれの軸が平行にずれた位置、いわゆる偏心した位置に配置されていてもよい。また、第１パイプと第２パイプとは、平行ではなく、角度を有するように配置されていてもよい。例えば、第１パイプと第２パイプとが屈曲して連結された、いわゆる偏角した関係となっていてもよい。 Also, the first pipe and the second pipe may not be coaxial but may be arranged with their axes shifted. For example, the first pipe and the second pipe may be arranged at positions where their axes are parallel to each other, ie, at eccentric positions. Also, the first pipe and the second pipe may be arranged not in parallel but at an angle. For example, the first pipe and the second pipe may be bent and connected to form a so-called eccentric relationship.

また、第１パイプの筐体への固定方法は特に限定されない。例えば、第１パイプを筐体内に配置した後に筐体を縮径することにより筐体に第１パイプを固定してもよい。
また、上記各実施形態では、第１筒部、第２筒部、第１パイプ、及び第２パイプがいずれも円筒形状である構成を例示した。しかしながら、それらの部品は、挿入される筒部とパイプの形状が対応していればよく、必ずしも軸方向を法線方向とする平面による断面形状が正円である円筒形状でなくてもよい。例えば、それらの部品は、外周が略四角形の筒状であってもよい。 Also, the method of fixing the first pipe to the housing is not particularly limited. For example, the first pipe may be fixed to the housing by reducing the diameter of the housing after placing the first pipe in the housing.
Moreover, in each of the above-described embodiments, the configurations in which the first tubular portion, the second tubular portion, the first pipe, and the second pipe are all cylindrical are exemplified. However, these parts need only have a shape corresponding to that of the tubular portion into which they are inserted, and do not necessarily have a cylindrical shape in which the cross-sectional shape of a plane normal to the axial direction is a perfect circle. For example, the parts may be tubular with a generally square outer circumference.

（３Ｅ）上記実施形態における１つの構成要素が有する複数の機能を、複数の構成要素によって実現したり、１つの構成要素が有する１つの機能を、複数の構成要素によって実現したりしてもよい。また、複数の構成要素が有する複数の機能を、１つの構成要素によって実現したり、複数の構成要素によって実現される１つの機能を、１つの構成要素によって実現したりしてもよい。また、上記実施形態の構成の一部を省略してもよい。また、上記実施形態の構成の少なくとも一部を、他の上記実施形態の構成に対して付加又は置換してもよい。 (3E) A plurality of functions possessed by one component in the above embodiments may be realized by a plurality of components, or a function possessed by one component may be realized by a plurality of components. . Also, a plurality of functions possessed by a plurality of components may be realized by a single component, or a function realized by a plurality of components may be realized by a single component. Also, part of the configuration of the above embodiment may be omitted. Moreover, at least part of the configuration of the above embodiment may be added or replaced with respect to the configuration of the other above embodiment.

１，１０１，２０１，３０１，５０１…消音器、１１，１１１，３１１，４１１…筐体、１２，１１２，２１２，３１２…第１パイプ、１３，１１３，２１３，３１３…第２パイプ、１４…ワイヤーメッシュ、２１，１２１…中央部、２２，１２２，２２２，３２２，４２２…第１筒部、２３，１２３，２２３，３２３，４２３…第２筒部、２４…第１テーパ部、２５…第２テーパ部、３１…第１主管部、３１ａ，１１２ａ…第１当接部、３２…第１副管部、３２ａ，１３１ａ…端部、３３，１３３…第１接続部、３４，４４…貫通孔、４１，１３１，２３１…挿入部、４２，１３２…第２当接部、４３…第２接続部、６１…レゾネスカバー、２３２…当接部、３３１…端部 1, 101, 201, 301, 501... Silencer 11, 111, 311, 411... Case, 12, 112, 212, 312... First pipe, 13, 113, 213, 313... Second pipe, 14... Wire mesh 21, 121... Central part 22, 122, 222, 322, 422... First cylindrical part 23, 123, 223, 323, 423... Second cylindrical part 24... First tapered part 25... Third 2 taper portions 31 first main pipe portion 31a, 112a first contact portion 32 first sub pipe portion 32a, 131a end portion 33, 133 first connection portion 34, 44 penetration Holes 41, 131, 231 Insertion portion 42, 132 Second contact portion 43 Second connection portion 61 Resonance cover 232 Contact portion 331 End

Claims (6)

筒状の筐体であって、中央部と、該中央部を中心とした両側に配置され該中央部よりも径の小さい第１筒部及び第２筒部を備える筐体と、前記第１筒部に挿入される第１パイプと、前記第２筒部に挿入される第２パイプと、を備える消音器の製造方法であって、
前記第１筒部に前記第１パイプが挿入された状態において前記第２筒部を形成することであって、前記筐体を縮径加工することにより、前記第２筒部に前記第２パイプを挿入することで前記第１パイプと前記第２パイプとの連結が実現される位置に前記第２筒部を形成することと、
前記第２筒部に前記第２パイプを挿入することによって、前記第１パイプと前記第２パイプとを前記筐体の内部において連結させることと、を含み、
前記第１パイプ及び前記第２パイプのうち、連結した部分において外側に配置されるパイプの前記筐体内部に位置する端部には、端面に向かって拡径するフレア加工またはテーパー加工が施されている、消音器の製造方法。 A cylindrical housing comprising a central portion, a first cylindrical portion and a second cylindrical portion arranged on both sides of the central portion and having a smaller diameter than the central portion; A method for manufacturing a muffler comprising a first pipe inserted into a tubular portion and a second pipe inserted into the second tubular portion,
forming the second tubular portion in a state in which the first pipe is inserted into the first tubular portion; forming the second tubular portion at a position where the connection between the first pipe and the second pipe is realized by inserting the
connecting the first pipe and the second pipe inside the housing by inserting the second pipe into the second tubular portion;
Of the first pipe and the second pipe, the end portion located inside the housing of the pipe arranged outside the connected portion is flared or tapered so as to increase in diameter toward the end face. A method for manufacturing a silencer. 請求項１に記載の消音器の製造方法であって、
前記第２筒部に前記第２パイプを挿入することは、前記第２筒部に前記第２パイプを圧入することである、消音器の製造方法。 A method for manufacturing the muffler according to claim 1,
The method of manufacturing a muffler, wherein inserting the second pipe into the second tubular portion is press-fitting the second pipe into the second tubular portion. 請求項１又は請求項２に記載の消音器の製造方法であって、
前記第２パイプにおける前記第２筒部に当接する当接部の径は、前記第２パイプにおける前記当接部よりも前記筐体の内部に位置する挿入部の径よりも大きい、消音器の製造方法。 A method for manufacturing a silencer according to claim 1 or claim 2,
The diameter of the contact portion of the second pipe that contacts the second cylindrical portion is larger than the diameter of the insertion portion located inside the housing than the contact portion of the second pipe. Production method. 請求項３に記載の消音器の製造方法であって、
前記第２筒部に前記第２パイプを挿入した後に、さらに、前記当接部を拡管して前記第２筒部に固定することを含む、消音器の製造方法。 A method for manufacturing a muffler according to claim 3,
A method of manufacturing a muffler, further comprising expanding the contact portion and fixing it to the second cylindrical portion after inserting the second pipe into the second cylindrical portion. 請求項１から請求項４のいずれか１項に記載の消音器の製造方法であって、
前記第２筒部を形成する前に、さらに、縮径加工により前記筐体に前記第１筒部を形成することと、前記第１筒部に前記第１パイプを挿入することと、を含む、消音器の製造方法。 A method for manufacturing a silencer according to any one of claims 1 to 4,
Further, before forming the second tubular portion, forming the first tubular portion in the housing by diameter reduction processing, and inserting the first pipe into the first tubular portion. , a method of manufacturing a silencer. 請求項５に記載の消音器の製造方法であって、
前記第１筒部に前記第１パイプを挿入することは、前記第１筒部に前記第１パイプを圧入することであり、
前記第１パイプの前記筐体内部に位置する端部は、前記第１パイプの前記第１筒部に挿入される部分よりも径が大きい、消音器の製造方法。 A method for manufacturing a muffler according to claim 5,
inserting the first pipe into the first tubular portion means press-fitting the first pipe into the first tubular portion;
The method of manufacturing a muffler, wherein the end portion of the first pipe located inside the housing has a larger diameter than the portion of the first pipe that is inserted into the first tubular portion.
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JPH10317941A (en) * 1997-05-14 1998-12-02 Nakagawa Sangyo Kk Manufacture of automobile muffler
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