JP6812476B2 - Exhaust muffler - Google Patents

Exhaust muffler Download PDF

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Publication number
JP6812476B2
JP6812476B2 JP2019020810A JP2019020810A JP6812476B2 JP 6812476 B2 JP6812476 B2 JP 6812476B2 JP 2019020810 A JP2019020810 A JP 2019020810A JP 2019020810 A JP2019020810 A JP 2019020810A JP 6812476 B2 JP6812476 B2 JP 6812476B2
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sound deadening
exhaust
deadening material
exhaust muffler
chamber
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JP2020128709A (en
Inventor
佐藤　淳也
淳也 佐藤
純一郎 鈴木
純一郎 鈴木
健 山中
健 山中
晋太郎 手嶋
晋太郎 手嶋
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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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
    • F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
    • 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
    • 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
    • F01N13/14—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 having thermal insulation
    • F01N13/141—Double-walled exhaust pipes or housings
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/36—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an exhaust flap
    • 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
    • F01N2310/00—Selection of sound absorbing or insulating material
    • F01N2310/06—Porous ceramics
    • 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
    • F01N2470/08—Gas passages being formed between the walls of an outer shell and an inner chamber
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/02—Two or more expansion chambers in series connected by means of tubes
    • 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
    • F01N2490/00—Structure, disposition or shape of gas-chambers
    • F01N2490/16—Chambers with particular shapes, e.g. spherical

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)

Description

本発明はエンジンの排気音を消音する排気マフラーに関する。 The present invention relates to an exhaust muffler that silences the exhaust noise of an engine.

排気マフラーの導入室に配置される消音材として、発泡セラミック材料が知られている。特許文献１には発泡セラミック材料により導入室を区画した構造等が開示されている。発泡セラミック材料は、消音効果（吸音効果）が高く、かつ、軽量であるという利点がある。 A foamed ceramic material is known as a sound deadening material arranged in the introduction chamber of the exhaust muffler. Patent Document 1 discloses a structure in which an introduction chamber is partitioned by a foamed ceramic material. The foamed ceramic material has an advantage that it has a high sound deadening effect (sound absorbing effect) and is lightweight.

特開昭５８−２８５０３号公報Japanese Unexamined Patent Publication No. 58-28503

しかし、発泡セラミック材料は、衝撃に対して脆弱である。特許文献１の構造であると、排気マフラーが縁石等の障害物と干渉した場合に、その衝撃によって発泡セラミック材料が割れる場合がある。 However, foamed ceramic materials are vulnerable to impact. With the structure of Patent Document 1, when the exhaust muffler interferes with an obstacle such as a curb, the foamed ceramic material may be cracked by the impact.

本発明の目的は、発泡セラミック材料を用いつつ、その割れの発生を低減可能な排気マフラーを提供することにある。 An object of the present invention is to provide an exhaust muffler capable of reducing the occurrence of cracks while using a foamed ceramic material.

本発明によれば、例えば、
エンジンの排気が導入される導入室を形成する外筒と、
前記導入室に配置され、発泡セラミック材料の消音材と、
を備えた排気マフラーであって、
前記消音材は、前記外筒の内壁面から離間して配置され、
前記消音材は円筒体であり、その外周面がカバー部材で覆われており、
前記カバー部材は、
前記外周面を覆う円筒状の周壁部と、
前記周壁部の、前記排気マフラーにおける排気の導入側の端部である第一の端部を塞ぐ端壁部とを有して、前記第一の端部と反対側の第二の端部は開放され、
前記排気は、前記消音材をその端面から内周面へ通過する、
ことを特徴とする排気マフラーが提供される。 According to the present invention, for example
The outer cylinder that forms the introduction chamber where the engine exhaust is introduced,
A sound deadening material made of foamed ceramic material, which is placed in the introduction chamber,
It is an exhaust muffler equipped with
The sound deadening material is arranged so as to be separated from the inner wall surface of the outer cylinder.
The sound deadening material is a cylindrical body, and its outer peripheral surface is covered with a cover member.
The cover member is
A cylindrical peripheral wall portion that covers the outer peripheral surface and
The peripheral wall portion has an end wall portion that closes the first end portion of the exhaust muffler on the exhaust introduction side, and the second end portion opposite to the first end portion is Opened,
The exhaust passes into the inner peripheral surface of the noise elimination material from the end face,
An exhaust muffler characterized by that is provided.

本発明によれば、発泡セラミック材料を用いつつ、その割れの発生を低減可能な排気マフラーを提供することができる。 According to the present invention, it is possible to provide an exhaust muffler capable of reducing the occurrence of cracks while using a foamed ceramic material.

本発明の適用例に係る車両の側面図。A side view of a vehicle according to an application example of the present invention. 図１のＡ−Ａ線断面図であり、本発明の一実施形態に係る排気マフラーの断面図。FIG. 1 is a cross-sectional view taken along the line AA of FIG. 1, which is a cross-sectional view of an exhaust muffler according to an embodiment of the present invention. 図２のＢ−Ｂ線断面図。FIG. 2 is a sectional view taken along line BB in FIG. （Ａ）及び（Ｂ）は排気流の説明図。(A) and (B) are explanatory views of the exhaust flow. カバー部材の他の例を示す断面図。FIG. 5 is a sectional view showing another example of the cover member.

以下、添付図面を参照して実施形態を詳しく説明する。尚、以下の実施形態は特許請求の範囲に係る発明を限定するものではなく、また実施形態で説明されている特徴の組み合わせの全てが発明に必須のものとは限らない。実施形態で説明されている複数の特徴うち二つ以上の特徴が任意に組み合わされてもよい。また、同一若しくは同様の構成には同一の参照番号を付し、重複した説明は省略する。 Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more of the plurality of features described in the embodiments may be arbitrarily combined. In addition, the same or similar configuration will be given the same reference number, and duplicate description will be omitted.

図１は本発明の適用例である鞍乗型車両Ｖの側面図（右側面図）である。車両Ｖは、前輪１と後輪２とを備えた自動二輪車である。なお、本発明は他の形式の鞍乗型車両或いは自動四輪車等の他の車両にも適用可能である。 FIG. 1 is a side view (right side view) of the saddle-mounted vehicle V, which is an application example of the present invention. The vehicle V is a motorcycle having a front wheel 1 and a rear wheel 2 . The present invention can also be applied to other types of vehicles such as saddle-mounted vehicles and motorcycles.

車両Ｖは、その骨格をなす車体フレーム３を備える。車体フレーム３には後輪２を駆動するエンジン４が支持されている。エンジン４は例えば多気筒の４サイクルエンジンであり、燃料タンクＴに収容された燃料が供給されることにより駆動する。エンジン４の駆動力は不図示の伝動機構を介して後輪２に伝達される。エンジン４の排気ポートから排出される燃焼ガス（排気ガス）は排気管９を介して排気され、その排気音は本発明の一実施形態にかかる排気マフラー１０で消音される。排気マフラー１０は車体の側部に配置されている。 The vehicle V includes a vehicle body frame 3 forming its skeleton. An engine 4 that drives the rear wheels 2 is supported on the body frame 3. The engine 4 is, for example, a multi-cylinder 4-cycle engine, which is driven by supplying fuel contained in a fuel tank T. The driving force of the engine 4 is transmitted to the rear wheels 2 via a transmission mechanism (not shown). The combustion gas (exhaust gas) discharged from the exhaust port of the engine 4 is exhausted through the exhaust pipe 9, and the exhaust noise is muted by the exhaust muffler 10 according to the embodiment of the present invention. The exhaust muffler 10 is arranged on the side of the vehicle body.

車体フレーム３の後部には、ライダが着座するシート８を支持するシートフレーム３ａが連結されている。車体フレーム３の後部にはスイングアーム５が揺動自在に支持されており、スイングアーム５には後輪２が回転自在に支持されている。 A seat frame 3a that supports the seat 8 on which the rider is seated is connected to the rear portion of the vehicle body frame 3. A swing arm 5 is rotatably supported on the rear portion of the vehicle body frame 3, and a rear wheel 2 is rotatably supported on the swing arm 5.

車体フレーム３は、ヘッドパイプ（不図示）を含み、ヘッドパイプには左右一対のフロントフォーク６及びセパレートタイプの左右のハンドル７が操向自在に支持されている。一対のフロントフォーク９には前輪１が回転自在に支持されている。 The vehicle body frame 3 includes a head pipe (not shown), and a pair of left and right front forks 6 and separate type left and right handles 7 are rotatably supported by the head pipe. The front wheels 1 are rotatably supported by the pair of front forks 9.

排気マフラー１０の構造について図２及び図３を参照して説明する。図２は排気マフラー１０の、図１のＡ−Ａ線断面図である。図３は図２のＢ−Ｂ線断面図である。 The structure of the exhaust muffler 10 will be described with reference to FIGS. 2 and 3. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 of the exhaust muffler 10. FIG. 3 is a cross-sectional view taken along the line BB of FIG.

排気マフラー１０は、その外壁を構成する外筒１１を含む。外筒１１は中空体であり、その内部空間が、エンジン４の排気が排気管９から導入される導入室Ｓを形成する。外筒１１は、排気の流れ方向Ｄで上流側の前部１１ａと、本体部１１ｂと、後壁部１１ｃとを含む。流れ方向Ｄは、排気マフラー１０における排気流を全体的に見た場合における排気流の上流、下流を示す。本体部１１ｂは本実施形態の場合、円筒体であり、前部１１ａは排気管９の外径から本体部１１ｂの外径まで拡径したテーパ形状を有している。後壁部１１ｃは、流れ方向Ｄで本体部１１ｂの下流端を塞ぐ円盤状の壁体である。 The exhaust muffler 10 includes an outer cylinder 11 constituting the outer wall thereof. The outer cylinder 11 is a hollow body, and the internal space thereof forms an introduction chamber S in which the exhaust gas of the engine 4 is introduced from the exhaust pipe 9. The outer cylinder 11 includes a front portion 11a on the upstream side in the exhaust flow direction D, a main body portion 11b, and a rear wall portion 11c. The flow direction D indicates upstream and downstream of the exhaust flow when the exhaust flow in the exhaust muffler 10 is viewed as a whole. In the case of this embodiment, the main body portion 11b is a cylindrical body, and the front portion 11a has a tapered shape in which the diameter is expanded from the outer diameter of the exhaust pipe 9 to the outer diameter of the main body portion 11b. The rear wall portion 11c is a disk-shaped wall body that closes the downstream end of the main body portion 11b in the flow direction D.

排気管９は本実施形態の場合、中心軸線ＣＬについて本体部１１ｂと同軸の円筒管であり、金属製の管である。排気管９の一部の区間である孔区間９ａにおいて周壁に複数の孔が形成されている。孔区間９ａは前部１１ａ内に位置しており、排気管９内の排気ガスが孔区間９ａの孔を通って前部１１ａ内に導入される。流れ方向Ｄで孔区間９ａの下流側となる排気管９の途中部には、排気管９内の排気ガスの通過量を制御する弁９ｂが配置されている。コントローラ１７により弁９ｂの開度を制御することで、排気管９を貫通してその下流端から外気に排気される排気量と、孔区間９ａを介して排気マフラー１０に導入された後に排気される排気量との割合を制御することができる。 In the case of the present embodiment, the exhaust pipe 9 is a cylindrical pipe coaxial with the main body 11b with respect to the central axis CL, and is a metal pipe. A plurality of holes are formed in the peripheral wall in the hole section 9a, which is a partial section of the exhaust pipe 9. Hole section 9a is located in front 11a, the exhaust gas in the exhaust pipe 9 is introduced into through holes of the hole section 9a front 11 within a. A valve 9b for controlling the amount of exhaust gas passing through the exhaust pipe 9 is arranged in the middle of the exhaust pipe 9 which is downstream of the hole section 9a in the flow direction D. By controlling the opening degree of the valve 9b by the controller 17 , the amount of exhaust gas that penetrates the exhaust pipe 9 and is exhausted to the outside air from its downstream end, and is exhausted after being introduced into the exhaust muffler 10 through the hole section 9a. It is possible to control the ratio with the displacement.

導入室Ｓ内には内筒１３が配置されている。本実施形態の場合、内筒１３は、筒状の部材であり、本実施形態の場合、排気管９と同軸で大径の円筒管であって、金属製の管である。外筒１１の本体部１１ｂ、内筒１３及び排気管９は中心軸線ＣＬを共通とする三重管構造を構成している。内筒１３は、流れ方向Ｄの上流端が閉鎖され、下流端は開放されている。内筒１３は、その下流端の側は外筒１１の後壁部１１ｃに支持され、上流端の側は排気管９を介して外筒１１の前部１１ａに支持されている。 An inner cylinder 13 is arranged in the introduction chamber S. In the case of the present embodiment, the inner cylinder 13 is a tubular member, and in the case of the present embodiment, it is a cylindrical pipe having a large diameter coaxial with the exhaust pipe 9 and is a metal pipe. The main body 11b, the inner cylinder 13, and the exhaust pipe 9 of the outer cylinder 11 form a triple pipe structure having a common central axis CL. The inner cylinder 13 has the upstream end in the flow direction D closed and the downstream end open. The downstream end side of the inner cylinder 13 is supported by the rear wall portion 11c of the outer cylinder 11, and the upstream end side is supported by the front portion 11a of the outer cylinder 11 via the exhaust pipe 9.

内筒１３は、流れ方向Ｄの上流端の側の一部の区間である孔区間１３ａにおいて、その周壁に複数の孔が形成されている。また、内筒１３の内壁面と排気管９の外壁面との間には、排気の通路１３ｂが形成されている。導入室Ｓに導入された排気ガスは、孔区間１３ａを介して通路１３ｂに導入され、内筒１３の下流端から外気へ排気される。このように内筒１３は排気通路として利用できる。通路１３ｂの幅となる、内筒１３の内壁面と排気管９の外壁面との間の距離は例えば２〜４ｍｍの範囲内で、例えば、３ｍｍである。 The inner cylinder 13 has a plurality of holes formed in the peripheral wall of the hole section 13a, which is a part of the section on the upstream end side in the flow direction D. Further, an exhaust passage 13b is formed between the inner wall surface of the inner cylinder 13 and the outer wall surface of the exhaust pipe 9. The exhaust gas introduced into the introduction chamber S is introduced into the passage 13b through the hole section 13a and exhausted to the outside air from the downstream end of the inner cylinder 13. In this way, the inner cylinder 13 can be used as an exhaust passage. The distance between the inner wall surface of the inner cylinder 13 and the outer wall surface of the exhaust pipe 9, which is the width of the passage 13b, is, for example, within the range of 2 to 4 mm, for example, 3 mm.

内筒１３には消音材１４が支持されており、内筒１３は消音材１４の支持部材として機能する。消音材１４は発泡セラミック材料のブロックである。発泡セラミック材料としては、互いに連通した無数の気孔が形成され、排気ガスが通過可能に形成された公知の発泡セラミックスを用いることができる。本実施形態の場合、消音材１４は円筒体である。内筒１３は消音材１４の中心孔１４ａに挿通されている。本実施形態の場合、内筒１３は金属製の管であり、発泡セラミック材料である消音材１４よりも高強度の部材であるため、消音材１４を内側から補強することができ、また、や支持剛性の向上を図ることができる。円筒体である消音材１４の周壁部は、外壁面（或いは外周面）１４ｂと、流れ方向Ｄで上流側の端面１４ｃと、下流側の端面１４ｄとを含む。 A sound deadening material 14 is supported on the inner cylinder 13, and the inner cylinder 13 functions as a support member for the sound deadening material 14. The sound deadening material 14 is a block of foamed ceramic material. As the foamed ceramic material, known foamed ceramics in which innumerable pores communicating with each other are formed and exhaust gas can pass through can be used. In the case of this embodiment, the sound deadening material 14 is a cylindrical body. The inner cylinder 13 is inserted into the central hole 14a of the sound deadening material 14. In the case of the present embodiment, since the inner cylinder 13 is a metal pipe and is a member having a higher strength than the sound deadening material 14 which is a foamed ceramic material, the sound deadening material 14 can be reinforced from the inside, and The support rigidity can be improved. The peripheral wall portion of the sound deadening material 14 which is a cylindrical body includes an outer wall surface (or outer peripheral surface) 14b, an end surface 14c on the upstream side in the flow direction D, and an end surface 14d on the downstream side.

消音材１４は、外筒１１の内壁面１１ｄから離間して配置されている。このような配置により、衝撃に対して脆弱な発泡セラミック材料である消音材１４の保護性能を向上できる。例えば、路上の縁石等の障害物が外筒１１に衝突した場合、或いは、車両Ｖが転倒して外筒１１が地面に衝突した場合、図２において矢印Ｆで示すように本体部１１ｂに対して衝撃が作用する場合がある。しかし、消音材１４は外筒１１の内壁面１１ｄから離間しており、内壁面１１ｄと、消音材１４の外壁面１４ｂ（より正確には後述の周壁部１２ｂ）との間には隙間１６が形成されている。矢印Ｆで示されるように本体部１１ｂに対して衝撃が作用しても、消音材１４に直接衝撃が作用せず、また、隙間１６が外筒１１のクラッシュゾーンとなって消音材１４に作用する衝撃が緩和される。この結果、消音材１４の割れの発生を低減することができる。 The sound deadening material 14 is arranged apart from the inner wall surface 11d of the outer cylinder 11. With such an arrangement, the protective performance of the sound deadening material 14 which is a foamed ceramic material vulnerable to impact can be improved. For example, when an obstacle such as a curb on the road collides with the outer cylinder 11, or when the vehicle V falls and the outer cylinder 11 collides with the ground, as shown by the arrow F in FIG. 2, the main body 11b Impact may act. However, the sound deadening material 14 is separated from the inner wall surface 11d of the outer cylinder 11, and there is a gap 16 between the inner wall surface 11d and the outer wall surface 14b of the sound deadening material 14 (more accurately, the peripheral wall portion 12b described later). It is formed. As shown by the arrow F, even if an impact acts on the main body 11b, the impact does not directly act on the sound deadening material 14, and the gap 16 acts as a crash zone of the outer cylinder 11 and acts on the sound deadening material 14. The impact is mitigated. As a result, the occurrence of cracks in the sound deadening material 14 can be reduced.

消音材１４の周囲には、カバー部材１２が設けられている。カバー部材１２は、筒状の部材であり、本実施形態の場合、排気管９と同軸の大径で、かつ、外筒１１の本体部１１ｂよりも小径の円筒管である。カバー部材１２は、流れ方向Ｄの上流端の端壁部１２ａと、円筒状の周壁部１２ｂとを有し、下流端は開放されている。カバー部材１２は例えば金属製であり、円盤形状の端壁部１２ａはその中心孔の部分において内筒１３に溶接等により固着される。周壁部１２ｂは消音材１４の外壁面１４ｂを囲み、周壁部１２ｂと外壁面１４ｂとの間にはガラスウール等の緩衝材１５が充填されている。消音材１４の端面１４ｃは端壁部１２ａに当接し、消音材１４が流れ方向Ｄにおいてカバー部材１２に保持される。カバー部材１２や緩衝材１５によって消音材１４の保護性能を更に向上できる。 A cover member 12 is provided around the sound deadening material 14. The cover member 12 is a cylindrical member, and in the case of the present embodiment, it is a cylindrical pipe having a large diameter coaxial with the exhaust pipe 9 and a diameter smaller than that of the main body portion 11b of the outer cylinder 11. The cover member 12 has an end wall portion 12a at the upstream end in the flow direction D and a cylindrical peripheral wall portion 12b, and the downstream end is open. The cover member 12 is made of metal, for example, and the disk-shaped end wall portion 12a is fixed to the inner cylinder 13 by welding or the like at the central hole portion thereof. The peripheral wall portion 12b surrounds the outer wall surface 14b of the sound deadening material 14, and a cushioning material 15 such as glass wool is filled between the peripheral wall portion 12b and the outer wall surface 14b. The end surface 14c of the sound deadening material 14 comes into contact with the end wall portion 12a, and the sound deadening material 14 is held by the cover member 12 in the flow direction D. The protective performance of the sound deadening material 14 can be further improved by the cover member 12 and the cushioning material 15.

端壁部１２ａは、導入室Ｓを、流れ方向Ｄで上流側の空気室Ｓ１と下流側の空気室Ｓ２とに区画する隔壁部としても機能する。隙間１６は、空気室Ｓ１と空気室Ｓ２とを連通させる連通路としても機能する。カバー部材１２の周壁部１２ｂと外筒１１の本体部１１ｂとの隙間１６の距離は例えば４〜６ｍｍの範囲内で、例えば、５ｍｍである。 The end wall portion 12a also functions as a partition wall portion that divides the introduction chamber S into the air chamber S1 on the upstream side and the air chamber S2 on the downstream side in the flow direction D. The gap 16 also functions as a communication passage for communicating the air chamber S1 and the air chamber S2. The distance of the gap 16 between the peripheral wall portion 12b of the cover member 12 and the main body portion 11b of the outer cylinder 11 is, for example, within the range of 4 to 6 mm, for example, 5 mm.

消音材１４は、流れ方向Ｄで空気室Ｓ２の上流側に位置しており、空気室Ｓ２はその下流側には折返室Ｓ２１を含む。消音材１４を上流側の空気室Ｓ１ではなく、下流側の空気室Ｓ２に配置することで、排気ガスの排気抵抗としての消音材１４の影響を小さくすることができる。消音材１４の端面１４ｄには折返室Ｓ２１から排気ガスが流入することになる。流速がより遅くなった排気ガスが消音材１４に流入するので、その消音効果を向上することができる。本実施形態の場合、消音材１４の周壁部は、内筒１３の孔区間１３ａと重なっており、端面１４ｄから消音材１４に流入した排気ガスは消音されつつ孔区間１３ａの孔を通って内筒１３内に流出することになる。このように消音材１４が孔区間１３ａに近い位置に配置されることで、排気ガス流のより下流側に消音材１４を配置することができ、消音材１４の排気抵抗としての影響を小さくしつつ消音効果を向上できる。 The sound deadening material 14 is located on the upstream side of the air chamber S2 in the flow direction D, and the air chamber S2 includes a folding chamber S21 on the downstream side thereof. By arranging the sound deadening material 14 not in the air chamber S1 on the upstream side but in the air chamber S2 on the downstream side, the influence of the sound deadening material 14 as the exhaust resistance of the exhaust gas can be reduced. Exhaust gas flows into the end surface 14d of the sound deadening material 14 from the turnaround chamber S21. Since the exhaust gas having a slower flow velocity flows into the sound deadening material 14, the sound deadening effect can be improved. In the case of the present embodiment, the peripheral wall portion of the sound deadening material 14 overlaps with the hole section 13a of the inner cylinder 13, and the exhaust gas flowing into the sound deadening material 14 from the end face 14d is silenced and inside through the hole of the hole section 13a. It will flow out into the cylinder 13. By arranging the sound deadening material 14 at a position close to the hole section 13a in this way, the sound deadening material 14 can be arranged on the downstream side of the exhaust gas flow, and the influence of the sound deadening material 14 as an exhaust resistance is reduced. While improving the muffling effect.

排気ガスの流れ方について図４（Ａ）及び図４（Ｂ）を参照して説明する。コントローラ１７は、例えば、エンジン４が低・中回転域では弁９ｂの開度を小さくし、エンジン４が高回転域では弁９ｂの開度を大きくする。図４（Ａ）は、弁９ｂが全閉の場合を示しており、排気ガスの流れが矢印で示している。排気管９内の排気ガスは孔区間９ａの孔を通って空気室Ｓ１に導入された後、隙間１６を通って空気室Ｓ２へ進入し、折返室Ｓ２１へ導かれる。その後、排気ガスは、消音材１４の端面１４ｄから消音材１４へ入り、内筒１３の孔区間１３ａの孔を通って内筒１３内に入る。消音材１４を排気ガスが通過する際に、その排気音が消音される。そして、内筒１３の通路１３ｂから大気へ放出される。 The flow of the exhaust gas will be described with reference to FIGS. 4 (A) and 4 (B). For example, the controller 17 reduces the opening degree of the valve 9b when the engine 4 has a low / medium speed range, and increases the opening degree of the valve 9b when the engine 4 has a high speed range. FIG. 4A shows a case where the valve 9b is fully closed, and the flow of exhaust gas is indicated by an arrow. The exhaust gas in the exhaust pipe 9 is introduced into the air chamber S1 through the hole of the hole section 9a, then enters the air chamber S2 through the gap 16 and is guided to the turnaround chamber S21. After that, the exhaust gas enters the sound deadening material 14 from the end surface 14d of the sound deadening material 14, passes through the hole of the hole section 13a of the inner cylinder 13, and enters the inner cylinder 13. When the exhaust gas passes through the sound deadening material 14, the exhaust sound is muted. Then, it is released into the atmosphere from the passage 13b of the inner cylinder 13.

図４（Ｂ）は、弁９ｂを開いた場合を示しており、排気ガスの流れが矢印で示している。排気管９内の排気ガスは、そのまま排気管９を通って大気へ放出されるものと、孔区間９ａの孔を通って空気室Ｓ１に導入されるものとに分かれる。弁９ｂの開度が大きい程、そのまま排気管９を通って大気へ放出される排気ガスの割合が高くなり、排気効率がよくなる。空気室Ｓ１に導入された排気ガスの流れは図４（Ａ）を参照して説明したものと同じである。 FIG. 4B shows a case where the valve 9b is opened, and the flow of the exhaust gas is indicated by an arrow. The exhaust gas in the exhaust pipe 9 is divided into one that is discharged to the atmosphere as it is through the exhaust pipe 9 and one that is introduced into the air chamber S1 through the hole in the hole section 9a. The larger the opening degree of the valve 9b, the higher the proportion of the exhaust gas discharged to the atmosphere through the exhaust pipe 9 as it is, and the better the exhaust efficiency. The flow of the exhaust gas introduced into the air chamber S1 is the same as that described with reference to FIG. 4 (A).

＜他の実施形態＞
上記実施形態では、弁９ｂを設けて排気管９を貫通する排気量を制御可能としたが、排気管９を、孔区間９ａよりも下流側において閉塞してもよい。 <Other embodiments>
In the above embodiment, the valve 9b is provided to control the amount of exhaust pipe penetrating the exhaust pipe 9, but the exhaust pipe 9 may be closed on the downstream side of the hole section 9a.

次に、上記実施形態では、カバー部材１２を消音材１４と別部材としたが、カバー部材１２をセラミック材料で消音材１４と一体に形成してもよい。図５はその一例を模式的に示す断面図である。図示の例では、カバー部材１２に代わるカバー部材１２’は、端壁部１２ａに代わる端壁部１２ａ’と、周壁部１２ｂに代わる周壁部１２ｂ’とを有し、とを有し、下流端は開放されている。端壁部１２ａ’は消音材１４の端面１４ｃと一体的に形成され、周壁部１２ｂ’は緩衝材１５の介在なく、消音材１４の外壁面１４ｂと一体的に形成されている。排気マフラー１０の組み立てに際し、端壁部１２ａ’は排気管９に固着してもよい。 Next, in the above embodiment, the cover member 12 is a separate member from the sound deadening material 14, but the cover member 12 may be integrally formed with the sound deadening material 14 with a ceramic material. FIG. 5 is a cross-sectional view schematically showing an example thereof. In the illustrated example, the cover member 12'instead of the cover member 12 has an end wall portion 12a'instead of the end wall portion 12a and a peripheral wall portion 12b'instead of the peripheral wall portion 12b, and has a downstream end. Is open. The end wall portion 12a'is integrally formed with the end surface 14c of the sound deadening material 14, and the peripheral wall portion 12b' is integrally formed with the outer wall surface 14b of the sound deadening material 14 without the intervention of the cushioning material 15. When assembling the exhaust muffler 10, the end wall portion 12a'may be fixed to the exhaust pipe 9.

カバー部材１２’及び消音材１４の製造にあたっては、例えば、原料となる金属酸化物の粉末を型内に配置し、消音材１４の形成部分には発泡剤を混入し、カバー部材１２’の形成部分には発泡剤を混入せず、焼成する。発泡剤を混入した消音材１４の部分には無数の気泡Ｐが形成されて発泡セラミックスとなり、発泡剤を混入しないカバー部材１２’の部分はセラミックスとなる。カバー部材１２’及び消音材１４が一体に形成されるので、排気マフラー１０の部品数の削減や組み立て工数の削減を図れる。なお、カバー部材１２’は周壁部１２ｂ’の無い、端壁部１２ａ’のみの構成も採用可能である。 In the production of the cover member 12'and the sound deadening material 14, for example, a metal oxide powder as a raw material is placed in a mold, and a foaming agent is mixed in the formed portion of the sound deadening material 14 to form the cover member 12'. Bake without mixing a foaming agent in the part. Innumerable bubbles P are formed in the portion of the sound deadening material 14 mixed with the foaming agent to form foamed ceramics, and the portion of the cover member 12'not mixed with the foaming agent is ceramics. Since the cover member 12'and the sound deadening material 14 are integrally formed, the number of parts of the exhaust muffler 10 can be reduced and the number of assembly steps can be reduced. It should be noted that the cover member 12'can adopt a configuration in which there is no peripheral wall portion 12b'and only the end wall portion 12a'.

次に、上記実施形態では、外筒１１、内筒１３、消音材１４をいずれも円筒形状としたが、角筒形状等、他の筒形状であってもよく、また、異軸上に配置されていてもよい。 Next, in the above embodiment, the outer cylinder 11, the inner cylinder 13, and the sound deadening material 14 all have a cylindrical shape, but may have another cylindrical shape such as a square cylinder shape, or may be arranged on a different axis. It may have been.

＜実施形態のまとめ＞
上記実施形態は、少なくとも以下の実施形態を開示する。 <Summary of Embodiment>
The above-described embodiment discloses at least the following embodiments.

１．上記実施形態の排気マフラー(例えば10)は、
エンジン(例えば4)の排気が導入される導入室(例えばS)を形成する外筒(例えば11)と、
前記導入室(例えばS)に配置され、発泡セラミック材料の消音材(例えば14)と、
を備えた排気マフラーであって、
前記消音材(例えば14)は、前記外筒(例えば11)の内壁面(例えば11d)から離間して配置されている。
この実施形態によれば、前記消音材と前記外筒の前記内壁面との間に隙間が存在するので、前記外筒に作用した衝撃力が前記消音材に直接作用することを回避又は緩和することができる。したがって、前記消音材として発泡セラミック材料を用いつつ、その割れの発生を低減可能な排気マフラーを提供することができる。 1. 1. The exhaust muffler (for example, 10) of the above embodiment is
An outer cylinder (eg 11) forming an introduction chamber (eg S) into which the exhaust of the engine (eg 4) is introduced,
A sound deadening material (eg 14) of a foamed ceramic material placed in the introduction chamber (eg S) and
It is an exhaust muffler equipped with
The sound deadening material (for example, 14) is arranged away from the inner wall surface (for example, 11d) of the outer cylinder (for example, 11).
According to this embodiment, since there is a gap between the sound deadening material and the inner wall surface of the outer cylinder, it is possible to avoid or alleviate the impact force acting on the outer cylinder directly acting on the sound deadening material. be able to. Therefore, it is possible to provide an exhaust muffler capable of reducing the occurrence of cracks while using a foamed ceramic material as the sound deadening material.

２．上記実施形態では、
前記導入室(例えばS)は、隔壁部(例えば12a,12a')により第一室(例えばS1)と第二室(例えばS2)とに区画されており、
前記第一室(例えばS1)と前記第二室(例えばS2)とは、前記消音材(例えば14)と前記外筒(例えば11)の前記内壁面(例えば11d)との間の連通路(例えば16)により連通している。
この実施形態によれば、前記消音材と前記外筒の前記内壁面との間に隙間を、前記連通路として併用でき、前記排気マフラーの小型化を図りながら、前記消音材の割れの発生を低減することができる。 2. 2. In the above embodiment
The introduction chamber (for example, S) is divided into a first chamber (for example, S1) and a second chamber (for example, S2) by a partition wall portion (for example, 12a, 12a').
The first chamber (for example, S1) and the second chamber (for example, S2) are a communication passage (for example, 11d) between the sound deadening material (for example, 14 ) and the inner wall surface (for example, 11d) of the outer cylinder (for example, 11). For example, it communicates with 16).
According to this embodiment, a gap between the sound deadening material and the inner wall surface of the outer cylinder can be used together as the continuous passage, and cracks in the sound deadening material can be generated while reducing the size of the exhaust muffler. It can be reduced.

３．上記実施形態では、
前記第二室(例えばS2)は、前記第一室(例えばS1)よりも排気の流れ方向(例えばD)で下流側に位置し、
前記消音材(例えば14)は、前記第二室(例えばS2)に配置されている。
この実施形態によれば、前記消音材を上流側の前記第一室ではなく、下流側の前記第二室に配置することで、排気ガスの排気抵抗としての前記消音材の影響を小さくすることができる。 3. 3. In the above embodiment
The second chamber (for example, S2) is located downstream of the first chamber (for example, S1) in the exhaust flow direction (for example, D).
The sound deadening material (for example, 14) is arranged in the second chamber (for example, S2).
According to this embodiment, by arranging the sound deadening material not in the first chamber on the upstream side but in the second chamber on the downstream side, the influence of the sound deadening material on the exhaust resistance of the exhaust gas is reduced. Can be done.

４．上記実施形態では、
前記第二室(例えばS2)は、前記連通路(例えば16)と連通し、排気の流れを折り返す折返室(例えばS21)を含み、
前記消音材(例えば14)には、前記折返室(例えばS21)で折り返された後の排気が通過する。
この実施形態によれば、流速がより遅くなった排気ガスが前記消音材に流入するので、その消音効果を向上することができる。 4. In the above embodiment
The second chamber (eg, S2) includes a turn-back chamber (eg, S21) that communicates with the communication passage (eg, 16) and turns the exhaust flow back.
The exhaust gas after being folded back in the folding chamber (for example, S21) passes through the sound deadening material (for example, 14).
According to this embodiment, the exhaust gas having a slower flow velocity flows into the sound deadening material, so that the sound deadening effect can be improved.

５．上記実施形態では、
前記隔壁部(例えば12a')は、セラミック材料により前記消音材(例えば14)と一体に形成されている。
この実施形態によれば、前記排気マフラーの部品数の削減や組み立て工数の削減を図れる。 5. In the above embodiment
The partition wall portion (for example, 12a') is integrally formed with the sound deadening material (for example, 14) by a ceramic material.
According to this embodiment, the number of parts of the exhaust muffler can be reduced and the assembly man-hours can be reduced.

６．上記実施形態では、
前記消音材(例えば14)は、円筒体であり、
前記消音材(例えば14)は、その中心孔(例えば14a)に挿通され前記消音材(例えば14)よりも高強度の支持部材(例えば13)により支持されている。
この実施形態によれば、前記消音材を内側から補強することができ、前記消音材の割れの発生を更に低減することができる。 6. In the above embodiment
The sound deadening material (for example, 14) is a cylindrical body and has a cylindrical body.
The sound deadening material (for example, 14) is inserted into its central hole (for example, 14a) and supported by a support member (for example, 13) having a higher strength than the sound deadening material (for example, 14).
According to this embodiment, the sound deadening material can be reinforced from the inside, and the occurrence of cracks in the sound deadening material can be further reduced.

７．上記実施形態では、
前記支持部材(例えば13)は、筒状の部材であり、その周壁の一部(例えば13a)には複数の孔が形成されており、
前記消音材(例えば14)を通過した排気は、前記複数の孔を介して前記支持部材(例えば13)の内部(例えば13b)に進入し、該内部を通って排気される。
この実施形態によれば、前記支持部材を前記消音材の補強のみならず、排気通路としても活用できる。 7. In the above embodiment
The support member (for example, 13) is a tubular member, and a plurality of holes are formed in a part of the peripheral wall thereof (for example, 13a).
The exhaust gas that has passed through the sound deadening material (for example, 14) enters the inside (for example, 13b) of the support member (for example, 13) through the plurality of holes, and is exhausted through the inside.
According to this embodiment, the support member can be used not only for reinforcing the sound deadening material but also as an exhaust passage.

８．上記実施形態では、
前記消音材(例えば14)の周壁部が前記複数の孔と重なっている。
この実施形態によれば、前記消音材を排気流の下流側に配置することができ、排気ガスの排気抵抗としての前記消音材の影響を小さくしつつ、消音効果を向上できる。 8. In the above embodiment
The peripheral wall portion of the sound deadening material (for example, 14) overlaps with the plurality of holes.
According to this embodiment, the muffling material can be arranged on the downstream side of the exhaust flow, and the muffling effect can be improved while reducing the influence of the muffling material as the exhaust resistance of the exhaust gas.

９．上記実施形態では、
前記排気マフラー(例えば10)は、鞍乗型車両(例えばV)のエンジン(例えば4)の排気音を消音する排気マフラーである。
この実施形態によれば、鞍乗型車両の軽量化に有益な排気マフラーを提供できる。 9. In the above embodiment
The exhaust muffler (for example, 10) is an exhaust muffler that silences the exhaust noise of the engine (for example, 4) of a saddle-mounted vehicle (for example, V).
According to this embodiment, it is possible to provide an exhaust muffler useful for reducing the weight of a saddle-mounted vehicle.

以上、発明の実施形態について説明したが、発明は上記の実施形態に制限されるものではなく、発明の要旨の範囲内で、種々の変形・変更が可能である。 Although the embodiments of the invention have been described above, the invention is not limited to the above-described embodiments, and various modifications and changes can be made within the scope of the gist of the invention.

１０ 排気マフラー、１１ 外筒、１４ 消音材、１６ 隙間 10 Exhaust muffler, 11 Outer cylinder, 14 Silencer, 16 Gap

Claims (9)

エンジンの排気が導入される導入室を形成する外筒と、
前記導入室に配置され、発泡セラミック材料の消音材と、
を備えた排気マフラーであって、
前記消音材は、前記外筒の内壁面から離間して配置され、
前記消音材は円筒体であり、その外周面がカバー部材で覆われており、
前記カバー部材は、
前記外周面を覆う円筒状の周壁部と、
前記周壁部の、前記排気マフラーにおける排気の導入側の端部である第一の端部を塞ぐ端壁部とを有して、前記第一の端部と反対側の第二の端部は開放され、
前記排気は、前記消音材をその端面から内周面へ通過する、
ことを特徴とする排気マフラー。 The outer cylinder that forms the introduction chamber where the engine exhaust is introduced,
A sound deadening material made of foamed ceramic material, which is placed in the introduction chamber,
It is an exhaust muffler equipped with
The sound deadening material is arranged so as to be separated from the inner wall surface of the outer cylinder.
The sound deadening material is a cylindrical body, and its outer peripheral surface is covered with a cover member.
The cover member is
A cylindrical peripheral wall portion that covers the outer peripheral surface and
The peripheral wall portion has an end wall portion that closes the first end portion of the exhaust muffler on the exhaust introduction side, and the second end portion opposite to the first end portion is Opened,
The exhaust passes into the inner peripheral surface of the noise elimination material from the end face,
Exhaust muffler featuring that. 請求項１に記載の排気マフラーであって、
前記端壁部は、隔壁部として機能し、
前記導入室は、前記隔壁部により第一室と第二室とに区画されており、
前記第一室と前記第二室とは、前記消音材と前記外筒の前記内壁面との間の連通路により連通している、
ことを特徴とする排気マフラー。 The exhaust muffler according to claim 1.
Said end wall portion functions as a partition wall,
The introduction room is divided into a first room and a second room by the partition wall portion.
The first chamber and the second chamber are communicated with each other by a communication passage between the sound deadening material and the inner wall surface of the outer cylinder.
Exhaust muffler featuring that. 請求項２に記載の排気マフラーであって、
前記第二室は、前記第一室よりも排気の流れ方向で下流側に位置し、
前記消音材は、前記第二室に配置されている、
ことを特徴とする排気マフラー。 The exhaust muffler according to claim 2.
The second chamber is located downstream of the first chamber in the exhaust flow direction.
The sound deadening material is arranged in the second chamber.
Exhaust muffler featuring that. 請求項３に記載の排気マフラーであって、
前記第二室は、前記連通路と連通し、排気の流れを折り返す折返室を含み、
前記消音材には、前記折返室で折り返された後の排気が通過する、
ことを特徴とする排気マフラー。 The exhaust muffler according to claim 3.
The second chamber includes a turn-back chamber that communicates with the communication passage and turns back the flow of exhaust gas.
The exhaust gas after being folded back in the turning chamber passes through the sound deadening material.
Exhaust muffler featuring that. エンジンの排気が導入される導入室を形成する外筒と、
前記導入室に配置され、発泡セラミック材料の消音材と、
を備えた排気マフラーであって、
前記消音材は、前記外筒の内壁面から離間して配置され、
前記消音材は円筒体であり、その外周面がカバー部材で覆われており、
前記排気は、前記消音材の端面と内周面との間を通過し、
前記カバー部材は、セラミック材料により前記消音材と一体に形成されている、
ことを特徴とする排気マフラー。 The outer cylinder that forms the introduction chamber where the engine exhaust is introduced,
A sound deadening material made of foamed ceramic material, which is placed in the introduction chamber,
It is an exhaust muffler equipped with
The sound deadening material is arranged so as to be separated from the inner wall surface of the outer cylinder.
The sound deadening material is a cylindrical body, and its outer peripheral surface is covered with a cover member.
The exhaust passes between the end face and the inner peripheral surface of the sound deadening material.
The cover member is integrally formed with the sound deadening material by a ceramic material.
Exhaust muffler featuring that. 請求項１乃至請求項５のいずれか一項に記載の排気マフラーであって、
前記消音材は、その中心孔に挿通され前記消音材よりも高強度の支持部材により支持されている、
ことを特徴とする排気マフラー。 The exhaust muffler according to any one of claims 1 to 5.
The sound deadening material is inserted into the central hole and supported by a support member having a higher strength than the sound deadening material.
Exhaust muffler featuring that. エンジンの排気が導入される導入室を形成する外筒と、
前記導入室に配置され、発泡セラミック材料の消音材と、
を備えた排気マフラーであって、
前記消音材は、前記外筒の内壁面から離間して配置され、
前記消音材は円筒体であり、その外周面がカバー部材で覆われており、
前記排気は、前記消音材の端面と内周面との間を通過し、
前記消音材は、その中心孔に挿通され前記消音材よりも高強度の支持部材により支持され、
前記支持部材は、筒状の部材であり、その周壁の一部には複数の孔が形成されており、
前記消音材を通過した排気は、前記複数の孔を介して前記支持部材の内部に進入し、該内部を通って排気される、
ことを特徴とする排気マフラー。 The outer cylinder that forms the introduction chamber where the engine exhaust is introduced,
A sound deadening material made of foamed ceramic material, which is placed in the introduction chamber,
It is an exhaust muffler equipped with
The sound deadening material is arranged so as to be separated from the inner wall surface of the outer cylinder.
The sound deadening material is a cylindrical body, and its outer peripheral surface is covered with a cover member.
The exhaust passes between the end face and the inner peripheral surface of the sound deadening material.
The sound deadening material is inserted into the central hole and supported by a support member having a higher strength than the sound deadening material.
The support member is a tubular member, and a plurality of holes are formed in a part of the peripheral wall thereof.
The exhaust gas that has passed through the sound deadening material enters the inside of the support member through the plurality of holes and is exhausted through the inside.
Exhaust muffler featuring that. 請求項７に記載の排気マフラーであって、
前記消音材の周壁部が前記複数の孔と重なっている、
ことを特徴とする排気マフラー。 The exhaust muffler according to claim 7.
The peripheral wall portion of the sound deadening material overlaps with the plurality of holes.
Exhaust muffler featuring that. 請求項１乃至請求項８のいずれか一項に記載の排気マフラーであって、
前記排気マフラーは、鞍乗型車両のエンジンの排気音を消音する排気マフラーである、
ことを特徴とする排気マフラー。 The exhaust muffler according to any one of claims 1 to 8.
The exhaust muffler is an exhaust muffler that silences the exhaust noise of the engine of a saddle-mounted vehicle.
Exhaust muffler featuring that.
JP2019020810A 2019-02-07 2019-02-07 Exhaust muffler Active JP6812476B2 (en)

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US2041767A (en) 1931-06-20 1936-05-26 Burgess Lab Inc C F Silencer
US4458779A (en) 1981-07-02 1984-07-10 Antiphon Ab Silencer
JPS60178920A (en) * 1984-02-24 1985-09-12 Sankei Giken Kogyo Kk Silencer
JPS63132816U (en) * 1987-02-20 1988-08-30
DE3729683A1 (en) 1987-09-04 1989-03-30 Mototech Motoren Umweltschutz Device for aftertreatment of the exhaust gases of small two-stroke spark ignition engines, and method for its manufacture
JP2934882B2 (en) * 1989-05-30 1999-08-16 嘉夫 森口 Air silencer
JPH0714119U (en) * 1993-08-12 1995-03-10 カルソニック株式会社 Tail pipe silencer
DE10160639B4 (en) 2001-12-08 2005-02-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. System and method for the aftertreatment of internal combustion engine exhaust gases

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