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US20100230205A1 - Muffler - Google Patents

Muffler Download PDF

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Publication number
US20100230205A1
US20100230205A1 US12/308,583 US30858307A US2010230205A1 US 20100230205 A1 US20100230205 A1 US 20100230205A1 US 30858307 A US30858307 A US 30858307A US 2010230205 A1 US2010230205 A1 US 2010230205A1
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US
United States
Prior art keywords
exhaust
exhaust gas
discharge port
muffler
cover hood
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.)
Abandoned
Application number
US12/308,583
Other languages
English (en)
Inventor
Buhei Kobayashi
Ryou Ono
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.)
Husqvarna Zenoah Co Ltd
Original Assignee
Husqvarna Zenoah 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 Husqvarna Zenoah Co Ltd filed Critical Husqvarna Zenoah Co Ltd
Assigned to HUSQVARNA ZENOAH CO., LTD. reassignment HUSQVARNA ZENOAH CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KOBAYASHI, BUHEI, ONO, RYOU
Publication of US20100230205A1 publication Critical patent/US20100230205A1/en
Abandoned legal-status Critical Current

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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
    • F01N1/14—Silencing apparatus characterised by method of silencing by adding air to exhaust gases
    • 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
    • F01N13/002—Apparatus adapted for particular uses, e.g. for portable devices driven by machines or engines
    • 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
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
    • 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
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/06—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for hand-held tools or portables devices

Definitions

  • the present invention relates to a muffler, and more particularly to a muffler for a small engine mounted on a portable work machine such as a blower, a chain saw, a cutoff saw, or a brushcutter.
  • An engine blower, a chain saw and the like have been traditionally known as a portable work machine driven by an engine.
  • the engine of such a portable work machine is driven at a position relatively close to an operator, and may be subjected to environmental regulations on temperature of exhaust gas from a muffler. Thus, it has been desired to discharge the exhaust gas at a low temperature. Specifically, temperature of exhaust gas from an engine cover that covers the engine and the muffler has been regulated.
  • outer air may be taken in by a jet flow of the exhaust gas to be mixed with the exhaust gas (for example, Patent Document 1).
  • an exhaust-gas guide member is provided on a surface of a muffler body for discharging exhaust gas from the muffler body in a predetermined direction.
  • the exhaust-gas guide member is covered by a cover hood. Owing to an ejector effect of exhaust gas discharged from the exhaust-gas guide member, outer air is introduced into the cover hood to be mixed with the exhaust gas for lowering the exhaust gas temperature.
  • Patent Document 1 JP-A-53-44998
  • Patent Document 1 has a problem that the cover hood for introducing outer air is enlarged, thus preventing downsizing of the muffler. Accordingly, it has been desired to facilitate downsizing of a muffler by devising an appropriate shape of a member that is capable of efficiently mixing exhaust gas and outer air.
  • An object of the invention is to provide a muffler capable of reliably lowering a temperature of exhaust gas by efficiently mixing the exhaust gas and outer air, and capable of being downsized as a whole.
  • a muffler includes: a muffler body having an expansion chamber; an exhaust-gas guide member covering an outlet for exhaust gas, the outlet being provided on the muffler body; and a cover hood that covers a discharge port for the exhaust gas, the discharge port being provided on the exhaust-gas guide member, in which a guide that guides the exhaust gas in the exhaust-gas guide member is gradually widened toward a top surface of the cover hood as proceeding to the discharge port.
  • a muffler includes: a muffler body having an expansion chamber; an exhaust-gas guide member covering an outlet for exhaust gas, the outlet being provided on the muffler body; and a cover hood that covers a discharge port for the exhaust gas, the discharge port being provided on the exhaust-gas guide member, in which a distance between a center of the outlet and the discharge port is less than or equal to a height of an opening portion of the discharge port.
  • a muffler includes: a muffler body having an expansion chamber; an exhaust-gas guide member covering an outlet for exhaust gas, the outlet being provided on the muffler body; a cover hood that covers a discharge port for the exhaust gas, the discharge port being provided on the exhaust-gas guide member; and a tail pipe mounted on the outlet in the expansion chamber, in which a height of an opening portion of the discharge port is less than or equal to an inner diameter of the tail pipe.
  • the exhaust gas from the discharge port can be reliably ejected toward the top surface and outer air introduced into the cover hood can be favorably mixed with the exhaust gas.
  • the outer air and the exhaust gas can be efficiently mixed and temperature of the exhaust gas can be favorably lowered while a muffler can be downsized as a whole.
  • the cover hood is provided with an outer-air mixing portion in which exhaust gas discharged from the discharge port and outer air introduced from an outside are mixed, and an opening area of the narrowest portion of a diameter-reduced portion provided in the outer-air mixing portion in a cross section crossing a flow direction of exhaust gas is four or more times larger than an opening area of the discharge port.
  • a sufficient amount of outer air can be introduced into the cover hood relative to an amount of the exhaust gas discharged from the exhaust-gas guide member for more reliably lowering the exhaust gas temperature.
  • a protrusion is provided adjacent to an exhaust port of the cover hood, the protrusion being protruding toward a center of the exhaust port in an in-plane direction.
  • FIG. 1 is an overall perspective view illustrating a muffler according to a first exemplary embodiment of the invention.
  • FIG. 2 is a cross sectional view taken along line II-II of the muffler shown in FIG. 1 .
  • FIG. 3 is a cross sectional view taken along line of the muffler shown in FIG. 1 .
  • FIG. 4 illustrates an attachment of the muffler in an enlarged manner.
  • FIG. 5 illustrates the attachment shown in FIG. 4 as viewed from a front side.
  • FIG. 6 illustrates the attachment shown in FIG. 4 as viewed from a rear side.
  • FIG. 7 is a cross sectional view illustrating a primary part of the muffler.
  • FIG. 8 illustrates simulation results of exit temperature according to the first exemplary embodiment.
  • FIG. 9 is a cross sectional view illustrating a primary part of a muffler according to a second exemplary embodiment of the invention.
  • FIG. 10 illustrates an attachment shown in FIG. 9 as viewed from a front side.
  • FIG. 11 illustrates simulation results of exit temperature according to the second exemplary embodiment.
  • FIG. 12 is a front elevation illustrating a muffler according to a third exemplary embodiment of the invention.
  • FIG. 13 illustrates an attachment according to the third exemplary embodiment.
  • FIG. 14 is a cross sectional view of a primary part of the third exemplary embodiment.
  • FIG. 1 is an overall perspective view illustrating a muffler 1 according to the first exemplary embodiment.
  • FIG. 2 is a cross sectional view taken along line II-II of the muffler 1 shown in FIG. 1 .
  • FIG. 3 is a cross sectional view taken along line III-III of the muffler 1 shown in FIG. 1 .
  • FIG. 4 illustrates an attachment 20 of the muffler 1 in an enlarged manner.
  • FIG. 5 illustrates the attachment 20 shown in FIG. 4 as viewed from a front side.
  • FIG. 6 illustrates the attachment 20 shown in FIG. 4 as viewed from a rear side.
  • the front side means a front stream side in a flow direction of exhaust gas
  • the rear side means a rear stream side in the flow direction of the exhaust gas.
  • the muffler 1 is used for a small two-cycle engine mounted on an engine blower (not shown).
  • the muffler 1 includes a box-shaped muffler body 10 in which an expansion chamber 2 is provided, and the attachment 20 attached on an outer surface of the muffler body 10 .
  • the muffler body 10 includes a base cover 11 having an intake 11 A into which exhaust gas is introduced from an engine.
  • a cover member 12 is attached to the base cover 11 by caulking of a periphery thereof.
  • a baffle 13 on which a plurality of circular holes 13 A are formed, is provided in an inner side of the intake 11 A. After the exhaust gas introduced from the intake 11 A bumps into an opposed surface 13 B of the baffle 13 , the exhaust gas is dispersed through the circular holes 13 A to be spread into the expansion chamber 2 .
  • a rear surface of the cover member 12 has a dual structure in which a heat-resistant muffling material 14 is provided.
  • the cover member 12 has an outlet 12 A for sending exhaust gas.
  • the outlet 12 A and the intake 11 A are disposed not to be aligned in a thickness direction of the muffler body 10 .
  • One end of a tail pipe 15 is fixed to the outlet 12 A via a bracket 15 A.
  • a pair of bolt insertion holes 12 B are provided on the cover member 12 .
  • a pair of communication holes (not shown) are formed on the base cover 11 respectively corresponding to the bolt insertion holes 12 B.
  • the bolt insertion holes 12 B and communication holes are communicated with each other through a guide pipe 17 in the muffler body 10 .
  • the muffler 1 is fixed to the engine by a bolt inserted into the guide pipe 17 .
  • An exhaust-gas guide member 21 covering the outlet 12 A is integrated with a cover hood 22 covering the exhaust-gas guide member 21 to provide the attachment 20 .
  • the exhaust-gas guide member 21 is provided with a guide 23 bulging upward.
  • a discharge port 23 A is formed on one end of the guide 23 .
  • a flange-shaped inserting portion 23 B is provided on a circumference of the guide 23
  • a mounting piece 23 C is provided consecutively with the inserting portion 23 B on the front side of the discharge port 23 A.
  • a portion in front of the discharge port 23 A defines an opening 23 D in the same plane of the mounting piece 23 C.
  • the cover hood 22 includes the discharge port 23 A and an outer-air mixing portion 24 covering the front side of the discharge port 23 A.
  • a fixing piece 24 A an end of which is fixed to an upper surface of the guide 23 , extends toward the rear side of the outer-air mixing portion 24 .
  • a gap between the outer-air mixing portion 24 and the guide 23 defines an outer-air introduction gap 24 B for introducing outer air into the outer-air mixing portion 24 .
  • a mounting piece 24 C having the same shape as the mounting piece 23 C of the guide 23 is provided on both sides of the outer-air mixing portion 24 .
  • the mounting pieces 23 C and 24 C are fixed to each other by spot welding or the like.
  • the mounting pieces 23 C and 24 C are provided with a semielliptical engaging portion 25 opened toward the rear side.
  • An exhaust port 24 D for discharging exhaust gas after being mixed with outer air is provided on a front end of the outer-air mixing portion 24 .
  • a protrusion 24 E is provided on an upper edge of the exhaust port 24 D.
  • the protrusion 24 E is bent toward a center of an opening portion of the exhaust port 24 D in an in-plane direction.
  • a position of the protrusion 24 E is not limited thereto. It is only required that the protrusion 24 E is provided near the exhaust port 24 D to close the exhaust port 24 D.
  • a diameter-reduced portion 24 F a cross-sectional area of which is gradually reduced toward the front side, is provided in a middle of the outer-air mixing portion 24 .
  • a dent 24 G depressed inward is provided on an upper surface of the diameter-reduced portion 24 F.
  • the inserting portion 23 B is inserted to be fitted to a fitting portion 18 provided on a surface of the cover member 12 and the engaging portions 25 are respectively engaged with a screw 19 temporarily fixed to the cover member 12 .
  • the attachment 20 is fixed to the muffler body 10 by tightening the screw 19 .
  • a spark arrestor 16 is disposed within the exhaust-gas guide member 21 so that a part of the spark arrestor 16 is projected from the discharge port 23 A.
  • an attachment surface 12 C on the cover member 12 is slightly inclined from a direction orthogonal to an axis of the tail pipe 15 as shown in FIG. 7 .
  • the thickness of the muffler body 10 is reduced toward the front side in the flow direction of exhaust gas.
  • An angle of inclination defines a direction of exhaust gas vented from the exhaust port 24 D, and any desired angle can be selected for carrying out the invention. Accordingly, the attachment surface 12 C may not be inclined depending on arrangements. In other words, the attachment surface 12 C may be orthogonal to the axis of the tail pipe 15 .
  • the guide 23 expands slightly upward toward a top surface 24 H of the cover hood 22 as proceeding to the discharge port 23 A.
  • a width of the guide 23 is entirely constant ( FIG. 4 ). Accordingly, exhaust gas can be reliably ejected from the discharge port 23 A toward the top surface 24 H of the cover hood 22 .
  • the discharge port 23 A is disposed slightly forward than the outlet 12 A.
  • a distance L 1 between a center of the outlet 12 A and the discharge port 23 A on a surface parallel to the attachment surface 12 C is set to be less than or equal to a height H 1 from the attachment surface 12 C to an inner upper circumference of the discharge port 23 A (L 1 /H 1 ⁇ 1).
  • the opening area S 1 is the narrowest portion in an inner space on a front end of the diameter-reduced portion 24 F (for example, a portion taken along line VII-VII in FIG. 7 , which is orthogonal to the flow direction of exhaust gas; except for a portion including the dent 24 G).
  • the opening area S 2 is an area of the discharge port 23 A of the guide 23 .
  • the simulated exit temperatures are supposed to be measured on a position spaced apart from the exhaust port 24 D by a predetermined distance.
  • a distal end of the cover hood 22 protrudes from a side surface of the muffler body 10 so that exhaust gas vented from the exhaust port 24 D is prevented from eddying such as rolling toward the side surface. Consequently, the exhaust gas can linearly flow outward.
  • the protrusion 24 E allows the exhaust gas discharged from the exhaust port 24 D to be concave as viewed from a front face.
  • a larger area of the exhaust gas can be exposed to outer air and temperature of the exhaust gas can be further lowered.
  • the exhaust gas spread into the expansion chamber 2 from the intake 11 A ( FIG. 2 ) is delivered to the exhaust-gas guide member 21 through the tail pipe 15 in order to be discharged from the discharge port 23 A to the cover hood 22 of the exhaust-gas guide member 21 .
  • the exhaust gas from the discharge port 23 A is ejected to be spread toward the top surface 24 H of the cover hood 22 since a cross-sectional shape of the guide 23 is gradually widened toward the top surface 24 H as proceeding to the end in the flow direction of the exhaust gas.
  • outer air is introduced into the outer-air mixing portion 24 of the cover hood 22 through the outer-air introduction gap 24 B formed between the exhaust-gas guide member 21 and the cover hood 22 .
  • the discharged exhaust gas and the introduced outer air are mixed in the outer-air mixing portion 24 , and the mixed exhaust gas is vented from the exhaust port 24 D.
  • the cross-sectional shape of the guide 23 formed on the exhaust-gas guide member 21 is gradually widened toward the top surface 24 H of the cover hood 22 , a flow of the exhaust gas discharged from the discharge port 23 A can reliably head for an upper side of the cover hood 22 .
  • the exhaust gas and outer air introduced into the cover hood 22 can be efficiently mixed to effectively lower temperature of the exhaust gas.
  • the exhaust gas can be more reliably ejected toward the top surface 24 H by setting a following condition: L 1 /H 1 ⁇ 1.
  • the exhaust gas and the outer air can be further efficiently mixed to favorably lower the temperature of the exhaust gas.
  • the outer air flowing in an upper side of the cover hood 22 can head for a lower side, so that the outer air heading for the lower side and the exhaust gas heading for the upper side can be more favorably mixed.
  • the diameter-reduced portion 24 F formed on the cover hood 22 does not only increase speed of a flow of exhaust gas, but also facilitates to mix the exhaust gas and outer air.
  • the exhaust gas and the outer air can be also favorably mixed in this respect.
  • the attachment 20 in which the exhaust-gas guide member 21 and the cover hood 22 are integrated with each other, can be easily attached to and detached from the muffler body 10 in a slidable manner. Also, it is not required to fully detach the screw 19 , which leads to easy attachment and detachment of the attachment 20 . Thus, the spark arrestor 16 and the tail pipe 15 can be easily cleaned, which improves workability.
  • the height H 1 of the discharge port 23 A of the exhaust-gas guide member 21 is less than or equal to an inner diameter D 1 of the tail pipe 15 (H 1 ⁇ D 1 ).
  • Other arrangements of this exemplary embodiment are the same as those of the first exemplary embodiment.
  • the opening area S 1 that is the portion in the narrowest inner space on the front end of the diameter-reduced portion 24 F is four times or more larger than the opening area S 2 of the discharge port 23 A of the guide 23 (S 1 /S 2 ⁇ 4). Consequently, the exhaust gas and outer air can be favorably mixed in the outer-air mixing portion 24 , which effectively lowers temperature of the exhaust gas.
  • FIGS. 12 to 14 illustrate the muffler 1 and a primary part of the muffler 1 according to a third exemplary embodiment of the invention.
  • all conditions L 1 /H 1 ⁇ 1 , H 1 ⁇ D 1 , and S 1 /S 2 ⁇ 4 as described in the first and second exemplary embodiments are satisfied.
  • the mounting piece 23 C of the exhaust-gas guide member 21 laterally extends from the muffler body 10 while the mounting piece 24 C of the cover hood 22 does not extend so that a length of the cover hood 22 is shortened as a whole. Accordingly, the exhaust port 24 D is closer to the outlet 12 A as compared with that of the first and second exemplary embodiments.
  • the mounting piece 23 C laterally extends, exhaust gas discharged from the exhaust port 24 D can be prevented from rolling, which allows a smooth discharge similar to the above exemplary embodiments.
  • the cover hood 22 is pressed to be fixed to the exhaust-gas guide member 21 by caulking of a pair of folds 241 formed on the mounting piece 23 C of the exhaust-gas guide member 21 while being fixed to the muffler body 10 together with the exhaust-gas guide member 21 by the screw 19 inserted into a through hole 24 J.
  • the inserting portion 23 B of the exhaust-gas guide member 21 is fitted to the fitting portion 18 and then the entire attachment 20 is fixed to the muffler body 10 by tightening the screw 19 .
  • a width of the outer-air mixing portion 24 of the cover hood 22 is constant in the flow direction of exhaust gas.
  • the outer-air mixing portion 24 does not have a diameter-reduced portion as described in the first and second exemplary embodiments. Such a shape effectively suppresses a height of the cover hood 22 and satisfies a condition S 1 /S 2 ⁇ 4, which prevents the attachment 20 from being enlarged.
  • the shape of the guide 23 of the exhaust-gas guide member 21 is widened as proceeding to the discharge port 23 A in the first and second exemplary embodiments, it is only required that a condition L 1 /H 1 ⁇ 1 is satisfied in the first exemplary embodiment and that a condition H 1 ⁇ D 1 is satisfied in the second exemplary embodiment.
  • the scope of the invention according to claim 2 or 3 includes the guide 23 having a constant shape in the flow direction of exhaust gas (i.e. a shape that is not widened as proceeding to the discharge port 23 A).
  • the scope of the invention according to claim 1 includes the guide 23 having a shape that is widened as proceeding to the discharge port 23 A even when the condition L 1 /H 1 ⁇ 1 or H 1 ⁇ D 1 is not satisfied.
  • the invention is applicable as a muffler for a small engine mounted on a portable work machine such as a blower, a chain saw, a cutoff saw, or a brushcutter.

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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)
US12/308,583 2006-06-21 2007-06-18 Muffler Abandoned US20100230205A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2006171351A JP5066344B2 (ja) 2006-06-21 2006-06-21 マフラー
JP2006-171351 2006-06-21
PCT/JP2007/062253 WO2007148659A1 (ja) 2006-06-21 2007-06-18 マフラー

Publications (1)

Publication Number Publication Date
US20100230205A1 true US20100230205A1 (en) 2010-09-16

Family

ID=38833401

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/308,583 Abandoned US20100230205A1 (en) 2006-06-21 2007-06-18 Muffler

Country Status (6)

Country Link
US (1) US20100230205A1 (ja)
EP (1) EP2031198A4 (ja)
JP (1) JP5066344B2 (ja)
CN (1) CN101473114B (ja)
TW (1) TW200801321A (ja)
WO (1) WO2007148659A1 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140284138A1 (en) * 2013-03-21 2014-09-25 Honda Motor Co., Ltd. Engine muffler
US9121319B2 (en) 2012-10-16 2015-09-01 Universal Acoustic & Emission Technologies Low pressure drop, high efficiency spark or particulate arresting devices and methods of use
CN110118114A (zh) * 2019-02-28 2019-08-13 浙江亚特电器有限公司 一种四冲程汽油机链锯的消音器排气结构

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JP6047479B2 (ja) * 2013-12-16 2016-12-21 日立建機株式会社 建設機械の排気装置
CN103806983A (zh) * 2014-01-23 2014-05-21 浙江亚特电器有限公司 一种触媒消音器
CN104165450A (zh) * 2014-06-09 2014-11-26 北京绿创声学工程设计研究院有限公司 一种动力回收型管式消声器
WO2016031717A1 (ja) * 2014-08-29 2016-03-03 日立工機株式会社 エンジン作業機
JP6095628B2 (ja) * 2014-10-20 2017-03-15 三菱電機株式会社 空気調和機用消音器及びその消音器を備えた空気調和機
JP6498086B2 (ja) * 2015-09-07 2019-04-10 川崎重工業株式会社 汎用エンジンのマフラ

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US3857458A (en) * 1972-09-11 1974-12-31 Toyo Kogyo Co Exhaust gas outlet means for an internal combustion engine
US4142607A (en) * 1976-09-25 1979-03-06 Firma Andreas Stihl Silencer, especially for portable motor chain saws
US4164989A (en) * 1977-06-08 1979-08-21 Andreas Stihl Muffler, especially for portable internal combustion engine
US4231221A (en) * 1978-04-12 1980-11-04 Dolmar Maschinenfabrik Gmbh & Co. Exhaust silencer for exhaust systems of internal combustion engines, particularly internal combustion engine-operated manual appliances
US4846301A (en) * 1987-04-14 1989-07-11 Aktiebolaget Electrolux Silencer
US5315075A (en) * 1988-10-01 1994-05-24 Andreas Stihl Exhaust gas muffler for an internal combustion engine
US5109949A (en) * 1989-08-30 1992-05-05 Mitsubishi Jukogyo Kabushiki Kaisha Muffler of industrial engine
US5651249A (en) * 1994-04-22 1997-07-29 Kioritz Corporation Exhaust muffler structure for internal combustion engine
US5866859A (en) * 1995-02-14 1999-02-02 Aktiebolaget Electrolux Spark arresting structure for a muffler having a catalytic converter
US5883342A (en) * 1996-05-25 1999-03-16 Andreas Stihl Ag & Co. Muffling device for combustion engines
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Cited By (4)

* Cited by examiner, † Cited by third party
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US9121319B2 (en) 2012-10-16 2015-09-01 Universal Acoustic & Emission Technologies Low pressure drop, high efficiency spark or particulate arresting devices and methods of use
US20140284138A1 (en) * 2013-03-21 2014-09-25 Honda Motor Co., Ltd. Engine muffler
US8950547B2 (en) * 2013-03-21 2015-02-10 Honda Motor Co., Ltd. Engine muffler
CN110118114A (zh) * 2019-02-28 2019-08-13 浙江亚特电器有限公司 一种四冲程汽油机链锯的消音器排气结构

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EP2031198A1 (en) 2009-03-04
CN101473114B (zh) 2012-06-06
EP2031198A4 (en) 2011-04-27
JP5066344B2 (ja) 2012-11-07
TW200801321A (en) 2008-01-01
WO2007148659A1 (ja) 2007-12-27
JP2008002320A (ja) 2008-01-10

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