EP2944783A1 - Auspufftopf - Google Patents

Auspufftopf Download PDF

Info

Publication number
EP2944783A1
EP2944783A1 EP13871221.1A EP13871221A EP2944783A1 EP 2944783 A1 EP2944783 A1 EP 2944783A1 EP 13871221 A EP13871221 A EP 13871221A EP 2944783 A1 EP2944783 A1 EP 2944783A1
Authority
EP
European Patent Office
Prior art keywords
tubular member
muffler
flow path
communication path
resonance chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13871221.1A
Other languages
English (en)
French (fr)
Other versions
EP2944783A4 (de
Inventor
Katsuhiko Kainuma
Tomohiro Furuya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Futaba Industrial Co Ltd
Original Assignee
Futaba Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Futaba Industrial Co Ltd filed Critical Futaba Industrial Co Ltd
Publication of EP2944783A1 publication Critical patent/EP2944783A1/de
Publication of EP2944783A4 publication Critical patent/EP2944783A4/de
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
    • F01N1/026—Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage
    • 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

Definitions

  • the present invention relates to a muffler that reduces exhaust noise.
  • Patent Document 1 includes a structure in which a muffler of a side branch type resonant system is provided between the main muffler and the sub-muffler.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. 2005-105918
  • a muffler of a Helmholtz type resonant system As a muffler of a resonant system, a muffler of a Helmholtz type resonant system is known in addition to the above-described muffler of the side branch type resonant system.
  • the Helmholtz type muffler is formed with a structure in which the exhaust flow path leads to a resonance chamber having a large volume via a long and narrow communication path, and thus, a problem has been found in which the structure is inevitably complicated.
  • a muffler of a Helmholtz type resonant system it is preferable to form a muffler of a Helmholtz type resonant system with a simple structure.
  • An aspect of the present invention is a muffler that comprises a first tubular member that forms an exhaust flow path of an internal combustion engine, and a second tubular member that is connected to the first tubular member and forms the exhaust flow path together with the first tubular member.
  • a double pipe portion is formed in which an end portion of the first tubular member is inserted into the second tubular member from an end portion thereof.
  • a leading end portion of the second tubular member is joined to an outer periphery of the first tubular member.
  • a portion that forms the double pipe portion of the second tubular member comprises a first portion located closer to an end of the first tubular member, and a second portion that is located closer to an end of the second tubular member and that has an enlarged diameter compared with the first portion.
  • a resonance chamber is formed between the first tubular member and the second portion.
  • a communication path that allows communication between the exhaust flow path and the resonance chamber is formed between the first tubular member and the first portion.
  • a Helmholtz type resonant system is formed by the resonance chamber and the communication path.
  • the Helmholtz type resonant system can be formed with a simple structure because the resonance chamber and the communication path of the Helmholtz type resonant system are formed using the double pipe portion formed by the two tubular members that form the exhaust flow path.
  • a spacer that inhibits contact between the first tubular member and the second tubular member may be provided in the communication path, and the spacer may be arranged so as to secure an air passage on an outer circumference of the first tubular member so that the communication path is not blocked. According to such a configuration, the communication path is less likely to be blocked, and an effect of reducing exhaust noise can thereby be enhanced.
  • each of the first tubular member and the second tubular member may be formed as a single part. According to such a configuration, it is not necessary to separately use dedicated components to form the Helmholtz type resonant system, and thus, space saving, cost reduction, and the like can be sought.
  • one aspect of the present invention can be achieved in various forms, such as an exhaust system including a muffler, and a method for muffling exhaust noise, besides the above-described muffler.
  • An exhaust system 1 shown in FIG. 1 forms an exhaust flow path, which is a flow path of exhaust gas discharged from an internal combustion engine of an automobile.
  • the exhaust system 1 is mainly configured with a flow path member 2 of a tubular shape forming the exhaust flow path having a long actual length.
  • the exhaust system 1 has a catalytic converter 3, a sub-muffler 4, and a main muffler 5 arranged in series with each other in order from the upstream of the exhaust flow path (from the left in FIG. 1 ) along the flow path member 2 (the exhaust flow path).
  • the flow path member 2 comprises a first tubular member 10 that forms the exhaust flow path in the downstream of the sub-muffler 4, and a second tubular member 20 that is connected to a downstream-side end portion of the first tubular member 10 and forms the exhaust flow path in the upstream of the main muffler 5.
  • the sub-muffler 4 and the main muffler 5 are connected to each other via the first tubular member 10 and the second tubular member 20.
  • the first tubular member 10 is a member formed by processing a circular pipe part having an outside diameter R1 (60.5 mm, for example), and is configured as a single part.
  • the first tubular member 10 is a member formed by reducing in diameter an end portion located in the downstream side (the right side in FIG. 2 ) of the circular pipe part having the outside diameter R1, specifically a portion having a length L1 from an end, to an outside diameter R2 (54.7 mm, for example) that is smaller than the outside diameter R1.
  • the portion having the length L1 from the end of the first tubular member 10 is referred to as a "reduced diameter portion 11"
  • the remaining portion is referred to as a "body portion 12".
  • the second tubular member 20 is a member formed by processing the circular pipe part having the outside diameter R1 similarly to the first tubular member 10, and is configured as a single part similarly to the first tubular member 10.
  • the second tubular member 20 is a member formed by enlarging in diameter an end portion located in the upstream side (the left side in FIG. 2 ) of the circular pipe part having the outside diameter R1, specifically a portion having a length L2 from an end, to an outside diameter larger than the outside diameter R1.
  • the second tubular member 20 is gradually increased in outside diameter from a position the length L2 apart from the end toward the end, and becomes largest in outside diameter (120 mm, for example) at a position a length L3 apart from the end (L3 ⁇ L2).
  • the second tubular member 20 is gradually decreased in outside diameter from a position a length L4 apart from the end (L4 ⁇ L3) toward the end.
  • a shape is formed by performing a diameter enlarging process on the portion having the length L2 from the end and then performing a diameter reducing process on a portion having the length L4 from the end, for example.
  • the portion having the length L2 from the end in the second tubular member 20 is referred to as an "enlarged diameter portion 21", and the remaining portion is referred to as a "body portion 22".
  • a double pipe portion including the first tubular member 10 as an inner pipe and the second tubular member 20 as an outer pipe (a portion in which the first tubular member 10 and the second tubular member 20 overlap with each other) is formed in a connection (a joint to be described later and a portion adjacent thereto) between the first tubular member 10 and the second tubular member 20.
  • the connection between the first tubular member 10 and the second tubular member 20 functions as a muffler 30 of a Helmholtz type resonant system, as will be described below.
  • the second tubular member 20, specifically the leading end portion 23 of the enlarged diameter portion 21, is joined (welded all around in the present embodiment) to the first tubular member 10, specifically on an outer periphery of the body portion 12.
  • a dead-end space is formed that communicates with the exhaust flow path, between the first tubular member 10 and the second tubular member 20.
  • a resonance chamber 31 having a large volume is formed between the body portion 12 of the first tubular member 10 and the enlarged diameter portion 21 of the second tubular member 20. In other words, a volume required as the resonance chamber 31 is secured by the enlarged diameter portion 21 of the second tubular member 20.
  • a communication path 32 is formed between the reduced diameter portion 11 of the first tubular member 10 and the body portion 22 of the second tubular member 20.
  • the communication path 32 is a space a cross-sectional area of which orthogonal to an axial direction is smaller than that of the resonance chamber 31, and allows communication between the exhaust flow path and the resonance chamber 31.
  • the resonance chamber 31 and the communication path 32 are designed to configure the Helmholtz type resonant system.
  • a wire mesh 40 which is a metal buffer member.
  • the wire mesh 40 functions as a spacer to inhibit contact between the first tubular member 10 and the second tubular member 20. Moreover, the wire mesh 40 also has a function of reducing stress of thermal contraction difference between the first tubular member 10 and the second tubular member 20. It is to be noted that an outside diameter of the wire mesh 40 is equal to or smaller than the outside diameter R1 of the body portion 12 of the first tubular member 10.
  • the wire mesh 40 is arranged so that an air passage is secured in an outer circumference of the first tubular member 10.
  • a plurality of (three in this example) the wire meshes 40 having a circular arc shape along the outer periphery of the first tubular member 10 are arranged on some parts of the entire outer circumference (range of 360 degrees) of the first tubular member 10, as shown in FIG. 4 .
  • the three wire meshes 40 are not as long as the entire outer circumference of the first tubular member 10 even when all of them are pieced together.
  • the three wire meshes 40 are arranged shifted from each other in an axial direction of the first tubular member 10 (on different positions in the axial direction) (see FIG. 2 ). Consequently, the air passage is secured successfully on the outer circumference of the first tubular member 10.
  • the muffler 30 is designed such that a resonance frequency thereof is coincident with an Nth-order mode (N is a natural number, and 1 in the present embodiment) of air column resonance frequency of a pipe, and the end of the first tubular member 10 is arranged so as to be at a position of the maximum sound pressure of the Nth mode.
  • N is a natural number, and 1 in the present embodiment

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
EP13871221.1A 2013-01-11 2013-12-18 Auspufftopf Withdrawn EP2944783A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013003714A JP6162407B2 (ja) 2013-01-11 2013-01-11 消音器
PCT/JP2013/083960 WO2014109192A1 (ja) 2013-01-11 2013-12-18 消音器

Publications (2)

Publication Number Publication Date
EP2944783A1 true EP2944783A1 (de) 2015-11-18
EP2944783A4 EP2944783A4 (de) 2016-08-31

Family

ID=51166851

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13871221.1A Withdrawn EP2944783A4 (de) 2013-01-11 2013-12-18 Auspufftopf

Country Status (6)

Country Link
US (1) US20150337699A1 (de)
EP (1) EP2944783A4 (de)
JP (1) JP6162407B2 (de)
CN (1) CN104903556A (de)
CA (1) CA2897138A1 (de)
WO (1) WO2014109192A1 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9095827B2 (en) 2008-04-21 2015-08-04 Tenneco Automotive Operating Company Inc. Exhaust gas flow mixer
US8939638B2 (en) 2008-04-21 2015-01-27 Tenneco Automotive Operating Company Inc. Method for mixing an exhaust gas flow
WO2016040543A1 (en) * 2014-09-11 2016-03-17 Faurecia Emissions Control Technologies, Usa, Llc Exhaust tube and tuning tube assembly with whistle reduction feature
US9534525B2 (en) 2015-05-27 2017-01-03 Tenneco Automotive Operating Company Inc. Mixer assembly for exhaust aftertreatment system
WO2017126083A1 (ja) * 2016-01-21 2017-07-27 フタバ産業株式会社 消音器
CN107622764A (zh) * 2016-07-13 2018-01-23 于泳林 一种噪音消除装置
US9856776B1 (en) * 2016-09-15 2018-01-02 Caterpillar Inc. Muffler with double shell housing
DE102019101418A1 (de) * 2018-01-26 2019-08-01 Futaba Industrial Co., Ltd. Schalldämpfer
US11319847B2 (en) 2018-09-19 2022-05-03 Tenneco Automotive Operating Company Inc. Exhaust device with noise suppression system
JP2022095467A (ja) * 2020-12-16 2022-06-28 フタバ産業株式会社 排気管
JP7457046B2 (ja) 2022-02-21 2024-03-27 フタバ産業株式会社 排気管

Family Cites Families (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2512823A (en) * 1945-05-02 1950-06-27 Blundell Alfred Air intake and exhaust silencer for internal-combustion engines
US3348629A (en) * 1965-10-07 1967-10-24 Gen Motors Corp Resonator silencer
US3404750A (en) * 1966-07-14 1968-10-08 Walker Mfg Co Combination tailpipe spout and silencer
US3543878A (en) * 1969-08-19 1970-12-01 Chrysler Corp Automobile exhaust muffler
US3561562A (en) * 1970-01-02 1971-02-09 Vincent E Ignoffo Automotive exhaust system units
JPS52111Y2 (de) * 1973-06-28 1977-01-05
JPS556436U (de) * 1978-06-28 1980-01-17
JPS5667318U (de) * 1979-10-30 1981-06-04
US6336471B1 (en) * 1981-07-16 2002-01-08 James J. Feuling Flow system for enhancing undirectional fluid flow
JPS58175114U (ja) * 1982-05-18 1983-11-22 三菱自動車工業株式会社 消音装置
JPS60128929U (ja) * 1984-02-08 1985-08-29 日産自動車株式会社 エンジン排気系の端部構造
JPS62150516U (de) * 1986-03-15 1987-09-24
JPH0243416U (de) * 1988-09-16 1990-03-26
US5025889A (en) * 1989-08-25 1991-06-25 General Motors Corporation Engine noise reducer
US5016730A (en) * 1990-01-17 1991-05-21 Tolo, Inc. Acoustic filter having acoustic isolation of internal flow element
DE59100068D1 (de) * 1990-04-30 1993-05-06 Beidl Christian Auspuffschalldaempfer, insbesondere fuer zweitakt-brennkraftmaschinen mit nachgeordnetem katalysator.
US5245140A (en) * 1992-04-20 1993-09-14 Wu Kan Chiao Muffler
DE69718237T2 (de) * 1996-05-29 2003-06-05 Calsonic Kansei Corp Flexible Rohreinheit zur Verwendung in Auspuffsystem von Fahrzeugbrennkraftmaschine
US5839473A (en) * 1996-06-20 1998-11-24 Camco Manufacturing Inc. RV generator auxiliary exhaust system and method
JP3333707B2 (ja) * 1997-03-26 2002-10-15 本田技研工業株式会社 エンジンの排気管構造
JP2000161042A (ja) * 1998-11-24 2000-06-13 Futaba Industrial Co Ltd 排ガス冷却化マフラ
JP4514967B2 (ja) * 2001-01-11 2010-07-28 三恵技研工業株式会社 エンジン用マフラおよびその製造方法
JP3901483B2 (ja) * 2001-10-04 2007-04-04 ヤマハ発動機株式会社 エンジンの吸気音調整構造及び排気音調整構造
JP2003113706A (ja) * 2001-10-04 2003-04-18 Toyota Motor Corp 機関排気系のマフラ
JP2005105918A (ja) * 2003-09-30 2005-04-21 Honda Motor Co Ltd エンジンの排気消音装置
US20060260869A1 (en) * 2005-05-18 2006-11-23 Kim Jay S Muffler having fluid swirling vanes
US7552797B2 (en) * 2007-06-15 2009-06-30 Don Emler Vehicular exhaust system
JP5064453B2 (ja) * 2009-07-31 2012-10-31 本田技研工業株式会社 車両用エンジンの排気管に設けられる消音器
US8607923B2 (en) * 2009-12-28 2013-12-17 Toyota Jidosha Kabushiki Kaisha Exhaust apparatus of internal combustion engine
JP6276032B2 (ja) * 2014-01-08 2018-02-07 フタバ産業株式会社 排気消音装置

Also Published As

Publication number Publication date
JP6162407B2 (ja) 2017-07-12
EP2944783A4 (de) 2016-08-31
CA2897138A1 (en) 2014-07-17
JP2014134180A (ja) 2014-07-24
US20150337699A1 (en) 2015-11-26
WO2014109192A1 (ja) 2014-07-17
CN104903556A (zh) 2015-09-09

Similar Documents

Publication Publication Date Title
EP2944783A1 (de) Auspufftopf
JP6857264B2 (ja) 消音器
US9523304B2 (en) Exhaust pipe
US9587536B2 (en) Exhaust muffler
US11635007B2 (en) Muffler
CN110080855B (zh) 消音器
WO2015104998A1 (ja) 排気消音装置
JP2007092628A (ja) 車両用消音器
JP4424017B2 (ja) 内燃機関の排気マニホルド
JP5648521B2 (ja) 吸気ダクト接続構造及びエアクリーナ装置
JP2005256644A (ja) 車両用排気系におけるテールパイプ構造
JP2005256736A (ja) 自動車用レゾネータ構造
JP7244284B2 (ja) 消音器及び排気管
JP4424018B2 (ja) 内燃機関の排気マニホルド
JP4424019B2 (ja) 内燃機関の排気マニホルド
JP2010138807A (ja) バッフルプレートに対する排気パイプの接続方法及びバッフルプレートに対する排気パイプの接続構造
JP4573862B2 (ja) 消音器
JP2017115681A (ja) エキゾーストマニホールド
JP2009197627A (ja) 車両用消音器
JP4884847B2 (ja) 排気管の接続構造
JP2008280925A (ja) エキゾーストマニホールド
CN114635778A (zh) 排气管
JP2005163569A (ja) 内燃機関の排気マニホルド
JP2006152829A (ja) 排気管構造
JP2008169773A (ja) エキゾーストマニホールドの集合部構造

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20150612

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAX Request for extension of the european patent (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20160802

RIC1 Information provided on ipc code assigned before grant

Ipc: F01N 13/18 20100101AFI20160727BHEP

Ipc: F01N 13/08 20100101ALI20160727BHEP

Ipc: F01N 1/02 20060101ALI20160727BHEP

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: FUTABA INDUSTRIAL CO., LTD.

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Effective date: 20161102