US20010037912A1 - Exhaust gas muffler having a spark arrestor screen - Google Patents

Exhaust gas muffler having a spark arrestor screen Download PDF

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Publication number
US20010037912A1
US20010037912A1 US09/844,317 US84431701A US2001037912A1 US 20010037912 A1 US20010037912 A1 US 20010037912A1 US 84431701 A US84431701 A US 84431701A US 2001037912 A1 US2001037912 A1 US 2001037912A1
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US
United States
Prior art keywords
exhaust gas
muffler
partition
spark arrestor
partial 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.)
Abandoned
Application number
US09/844,317
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English (en)
Inventor
Johannes Menzel
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.)
Andreas Stihl AG and Co KG
Original Assignee
Andreas Stihl AG and Co KG
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 Andreas Stihl AG and Co KG filed Critical Andreas Stihl AG and Co KG
Assigned to ANDREAS STIHL AG & CO. reassignment ANDREAS STIHL AG & CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MENZEL, JOHANNES
Publication of US20010037912A1 publication Critical patent/US20010037912A1/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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1872—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal
    • F01N13/1877—Construction facilitating manufacture, assembly, or disassembly the assembly using stamp-formed parts or otherwise deformed sheet-metal the channels or tubes thereof being made integrally with the housing
    • 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
    • F01N1/08—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling
    • F01N1/089—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling using two or more expansion chambers in series
    • 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
    • F01N13/002—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
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/06—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for extinguishing sparks
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/20—Methods or apparatus for fitting, inserting or repairing different elements by mechanical joints, e.g. by deforming housing, tube, baffle plate or parts thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/22—Methods or apparatus for fitting, inserting or repairing different elements by welding or brazing
    • 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
    • F01N2450/00—Methods or apparatus for fitting, inserting or repairing different elements
    • F01N2450/24—Methods or apparatus for fitting, inserting or repairing different elements by bolts, screws, rivets or the like
    • 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
    • F01N2490/08—Two or more expansion chambers in series separated by apertured walls only
    • 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 for the exhaust gas of an internal combustion engine, especially in a manually guided implement such as a power chain saw or the like, and includes a muffler housing that surrounds a muffling chamber and has an inlet opening and an outlet for the engine exhaust gas, whereby in the flow path of the exhaust gas a spark arrestor screen as well as, on the side of the inlet opening, an exhaust gas diffuser are provided.
  • a spark arrestor screen is disposed in the mufflers of motor-driven implements such as chain saws, brush cutters, suction devices/blowers, or the like.
  • Such spark arrestor screens which are disposed in the flow path of the exhaust gas, are subjected to high mechanical stresses due to temperature and pressure fluctuations.
  • U.S. Pat. No. 4,370,855 discloses a muffler of a power chain saw, according to which an exhaust gas diffuser in the form of a plate having many holes is disposed in the flow path of the exhaust gas on the side of the inlet opening. In the region of its holes, the exhaust gas diffuser is surrounded by a tubular spark arrestor screen. Along its flow path, the exhaust gas first passes the inlet opening, and subsequently the holes of the exhaust gas diffuser. In so doing, the pressure of the exhaust gas is partially relieved, and the noise level drops. After passing through the spark arrestor screen, the exhaust gas passes into the interior of the muffler, where a further drop in pressure occurs, before the exhaust gas flows through the outlet into the atmosphere.
  • the flow velocity of the exhaust gas is relatively high in the individual openings of the exhaust gas diffuser, whereby the spark arrestor screen is subjected to high mechanical stress due to these high flow velocities. Due to the close arrangement of the spark arrestor screen on the exhaust gas outlet of the cylinder, the temperature level, as well as the pressure level, are very high, which can lead to a premature failure of the spark arrestor screen. The then necessary replacement of the spark arrestor screen is complicated and time consuming, since it is necessary to disassemble the muffler.
  • DE-OS 25 39 516 discloses a muffler where a spark arrestor grating is disposed in the vicinity of the muffler outlet.
  • a spark arrestor grating is disposed in the vicinity of the muffler outlet.
  • Such gratings tend to get clogged with soot and residue, since the exhaust gas stream in the vicinity of the outlet has an already reduced, low temperature. Oil or soot residues that are carried along in the exhaust gas stream settle on the grating, whereby the temperature of the exhaust gas stream is not sufficient to burn off the resulting deposits.
  • FIG. 1 is a cross-sectional view through one exemplary embodiment of an inventive exhaust gas muffler showing the flow path of the exhaust gas
  • FIG. 2 is an exploded view of the individual components of the muffler embodiment of FIG. 1 showing structural details.
  • the muffler of the present invention is characterized primarily in that the muffling chamber is divided by a partition into a first partial chamber and a second partial chamber, wherein the volume of the second partial chamber corresponds at least approximately to the volume of the first partial chamber, and wherein the spark arrestor screen is disposed in the partition between the first and second partial chambers.
  • the basic concept of the present invention is to dispose a spark arrestor screen in an exhaust gas muffler in such a way that on the one hand the pressure of the exhaust gas stream is adequately reduced in the muffler, and the acoustic pressure peaks are smoothed to such an extent that mechanical overloading of the spark arrestor screen is reliably prevented.
  • the temperature level of the exhaust gas stream is sufficiently high, so that retained oil or soot particles are burned, thus reliably avoiding clogging of the spark arrestor screen.
  • the muffling chamber is divided by a partition into two partial chambers, which are interconnected by an opening in which is disposed the spark arrestor screen.
  • a so-called exhaust gas diffuser having a plate that is provided with a plurality of holes and is disposed in the region of the inlet opening generates a first stage for the pressure relief and smoothing of the acoustic pressure peaks in the exhaust gas stream. After passing the exhaust gas diffuser the exhaust gas stream enters the first of the two partial chambers, whereby the individual partial streams through the individual holes of the exhaust gas diffuser are combined in the partial chamber with a reduced overall pressure and lower acoustic pressure peaks.
  • the exhaust gas stream passes through the spark arrestor screen into the second partial chamber, in which a further pressure relief is effected. Finally, upon discharge via the outlet, the exhaust gas stream is relieved to the pressure level of the atmosphere.
  • the pressure of the exhaust gas stream is relieved to such an extent, and the acoustic pressure peaks are smoothed to such an extent, that the mechanical stress of the spark arrestor screen is lowered.
  • the volume of the second partial chamber is at least approximately as great as the volume of the first partial chamber, and advantageously corresponds to the volume of the first partial chamber together with the volume of the exhaust gas diffuser.
  • the partition between the first and second partial chambers is also a wall portion of the exhaust gas diffuser.
  • This wall portion is significantly heated up by the still very hot exhaust gas stream that enters the exhaust gas diffuser via the inlet opening.
  • the spark arrestor screen that is held therein is reliably maintained at a high temperature level to avoid soot residue and clogging.
  • a simple solution to reduce manufacturing costs is provided by positively holding the spark arrestor screen in the partition in the flow-through direction.
  • a holding means is preferably disposed on the partition into which the spark arrestor screen can be inserted and which at least partially engages around the periphery of the screen.
  • the exhaust gas diffuser is formed from the appropriately embodied partition on which is mounted an additional baffle plate that delimits the interior of the exhaust gas diffuser.
  • the partition, and the baffle plate secured thereon, advantageously each have a ridge or shoulder that together form the retaining means. This eliminates the necessity for embodying the retaining means as a separate component.
  • the muffler housing has a mounting slot through which the spark arrestor screen can be inserted into the retaining means. Consequently, for cleaning or replacement purposes the spark arrestor screen can be removed from and reinserted into the muffler housing without having to disassemble the housing.
  • the spark arrestor screen is reliably secured on the muffler housing with little expense by means of a screw, and in particular by means of a self-tapping sheet metal screw.
  • the muffler housing is preferably formed from two partial shells or housing sections that are interconnected along a circumferential seam or joint, and at the same time are also connected with the partition.
  • the essential components of the muffler can thus be interconnected in a single operation.
  • the circumferential seam or joint is advantageously embodied in such a way that it is disposed in a single plane.
  • the connection tool can have a simple design, especially for an automated manufacture.
  • the spark arrestor screen which can be inserted from the outside, is expediently provided with an angled-off retaining portion that engages about the circumferential joint. Consequently, the spark arrestor screen is additionally positively held also in the region of the mounting slot.
  • a muffler housing 2 surrounds an attenuation or muffling chamber 1 that is divided by a partition 8 into a first partial chamber 9 and a second partial chamber 10 .
  • the muffler housing 2 comprises a first partial shell or housing section 12 and a second partial shell or housing section 13 that are interconnected at a plane of separation 15 in common with the partition 8 .
  • Such a connection can be effected by welding, brazing or the like, and in the illustrated embodiment is formed by a flanged-over seam or joint 14 .
  • an inlet opening 3 is provided for the exhaust gas stream; this inlet opening is formed by an annular collar 25 .
  • the partition 8 is provided with a tubular neck 26 that extends about the collar 25 and is connected therewith.
  • a baffle plate 20 is secured to the partition 8 on that side opposite the inlet opening 3 or neck 26 .
  • the baffle plate 20 together with the neck 26 , surround the interior 19 of an exhaust gas diffuser 7 , whereby a wall portion 11 of the exhaust gas diffuser 7 is provided with a plurality of diffuser openings 27 , which are shown in greater detail in FIG. 2.
  • Furthermore provided in the partition 8 is a screen opening 28 for receiving a spark arrestor screen 6 .
  • the second housing section 13 of the muffler housing 2 is provided with an exhaust gas stream outlet 4 that is covered by an outlet hood 30 .
  • the path of the flow of the exhaust gas is illustrated by the arrows 5 , according to which the exhaust gas stream first passes via the inlet opening 3 into the interior 19 of the exhaust gas diffuser 7 .
  • the muffler is fixed in position directly on the exhaust port of the cylinder.
  • the exhaust gas stream is conveyed, by the spark arrestor screen 6 in the screen opening 28 , into the second partial chamber 10 , whereby a further drop in pressure occurs.
  • the exhaust gas stream finally passes through the outlet 4 into the atmosphere.
  • the individual partial streams that pass through the plurality of diffuser openings 27 are combined in the first partial chamber 9 , whereby the relatively large volume of this first partial chamber 9 initially leads to a reduction in the flow velocity.
  • the screen opening 28 has a small cross-sectional area, resulting in a re-acceleration of the exhaust gas stream which, however, no longer has the high acoustic pressure peaks as in the region of the exhaust gas diffuser. Due to the high flow velocity through the spark arrestor screen 6 , the cleaning effect of the high temperature is enhanced, whereby the reduced pressure peaks prevent a mechanical overloading of the spark arrestor screen 6 .
  • the volume of the second partial chamber 10 is at least approximately as great as the volume of the first partial chamber 9 , and in the illustrated embodiment is approximately as great as the volume of the first partial chamber 9 together with the volume of the interior 19 of the exhaust gas diffuser 7 . Due to the unitary configuration of the partition 8 with the wall portion 11 and the mounting of the baffle plate 20 to the partition 8 , a good thermal connection of the spark arrestor screen 6 with the exhaust gas diffuser 7 is provided.
  • the spark arrestor screen 6 can be screw-connected with the partition 8 , and in the illustrated embodiment is positively held by a retaining means 16 in the direction of the flow through direction, which is illustrated by the arrow 24 .
  • the retaining means 16 is formed by a respective ridge or shoulder 17 , 18 of the partition 8 and the baffle plate 20 respectively, between which the spark screen 6 is inserted from the outside through the mounting slot 21 .
  • FIG. 2 shows the structural details of the individual components of the muffler of FIG. 1.
  • the first and second housing sections 12 , 13 , the partition 8 , the baffle plate 20 , as well as the outlet hood 30 are embodied as stamped, punched, or deep drawn sheet metal parts.
  • the partition 8 is provided with a recessed portion that surrounds the neck 26 and forms the wall portion 11 of the exhaust gas diffuser 7 that is shown in FIG. 1.
  • the plurality of diffuser openings 27 are provided in this wall portion 11 .
  • the screen opening 28 is bordered by the ridge 17 in the region that does not adjoin the joint 14 (see FIG. 1).
  • the ridge 17 together with the ridge 18 of the baffle plate 20 , form the retaining means 16 (FIG. 1) for the spark arrestor screen 6 .
  • retaining tabs or the like can also be advantageously formed on the partition 8 as separate parts or can be integral therewith.
  • the second housing section 13 is provided between its edge that forms the joint 14 , and the outlet 4 , with the mounting slot 21 through which the spark arrestor screen 6 can be guided.
  • the spark arrestor screen 6 is monolithically formed from a stamped wire mesh, and is provided with an angled-off retaining portion 22 .
  • the screw 23 is embodied as a self-tapping sheet metal screw 23 that engages in a screw hole 29 of the first housing section 12 .
  • the angled-off retaining portion 22 engages around the seam or joint 14 and thus represents an additional positive connection of the spark arrestor screen 6 with the muffler housing 2 .

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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)
  • Exhaust Gas After Treatment (AREA)
US09/844,317 2000-04-26 2001-04-26 Exhaust gas muffler having a spark arrestor screen Abandoned US20010037912A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10020373.6 2000-04-26
DE10020373A DE10020373A1 (de) 2000-04-26 2000-04-26 Abgasschalldämpfer mit Funkenschutzsieb

Publications (1)

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US20010037912A1 true US20010037912A1 (en) 2001-11-08

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US09/844,317 Abandoned US20010037912A1 (en) 2000-04-26 2001-04-26 Exhaust gas muffler having a spark arrestor screen

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US (1) US20010037912A1 (de)
JP (1) JP2001355443A (de)
DE (1) DE10020373A1 (de)
FR (1) FR2808303A1 (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6837335B2 (en) 2002-01-31 2005-01-04 Mtd Products Inc Replaceable catalyst for exhaust system
US20050155817A1 (en) * 2004-01-17 2005-07-21 Jan Brand Muffler for internal combustion motor vehicles
US20050217931A1 (en) * 2004-04-05 2005-10-06 Mtd Products Inc Method and apparatus for venting exhaust gas from an engine
US20050263344A1 (en) * 2004-05-27 2005-12-01 Warfel Paul A Exhaust gas muffler
US20080164092A1 (en) * 2006-08-30 2008-07-10 Dolmar Gmbh Silencer with fin outlet
US20080245604A1 (en) * 2006-08-29 2008-10-09 Tecumseh Power Company Passive secondary air muffler
US20090255519A1 (en) * 2008-04-14 2009-10-15 Dolmar Gmbh Silencer for a motor device
US20100163337A1 (en) * 2006-03-28 2010-07-01 Husqvarna Zenoah Co., Ltd. Muffler
US20120228049A1 (en) * 2011-03-09 2012-09-13 Makita Corporation Arrangement of a silencer on a combustion motor with improved coupling to the cylinder
US20120228053A1 (en) * 2011-03-09 2012-09-13 Makita Corporation Silencer for a two-stroke motor of a power tool
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
US11073068B2 (en) * 2018-03-13 2021-07-27 Honda Motor Co., Ltd. Exhaust device equipped with spark arrester

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10361216B4 (de) * 2003-12-24 2012-11-15 Andreas Stihl Ag & Co. Kg Abgasschalldämpfer
DE202006013379U1 (de) * 2006-08-31 2008-01-03 Dolmar Gmbh Abgaseinrichtung mit einem Flammenresonator
CN103573334A (zh) * 2012-07-31 2014-02-12 东莞市旗丰消声器有限公司 大排量豪华摩托车消声器
DE102012112189A1 (de) * 2012-12-12 2014-06-12 Sandvik Materials Technology Deutschland Gmbh Vorrichtung und Verfahren zum Abstechen eines Rohrs

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2539516A1 (de) 1975-09-05 1977-04-07 Boysen Friedrich Kg Auspuffvorrichtung fuer brennkraftmaschinen, insbesondere an land- und forstwirtschaftlichen handarbeitsgeraeten
US4370855A (en) 1979-06-25 1983-02-01 Emerson Electric Co. Muffler for portable engine

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6837335B2 (en) 2002-01-31 2005-01-04 Mtd Products Inc Replaceable catalyst for exhaust system
US20050155817A1 (en) * 2004-01-17 2005-07-21 Jan Brand Muffler for internal combustion motor vehicles
US20050217931A1 (en) * 2004-04-05 2005-10-06 Mtd Products Inc Method and apparatus for venting exhaust gas from an engine
US7156202B2 (en) 2004-04-05 2007-01-02 Mtd Products Inc Method and apparatus for venting exhaust gas from an engine
US20050263344A1 (en) * 2004-05-27 2005-12-01 Warfel Paul A Exhaust gas muffler
US20100163337A1 (en) * 2006-03-28 2010-07-01 Husqvarna Zenoah Co., Ltd. Muffler
US8360200B2 (en) * 2006-03-28 2013-01-29 Husqvarna Zenoah Co., Ltd. Muffler
US7854296B2 (en) * 2006-08-29 2010-12-21 Certified Ports Corporation Passive secondary air muffler
US20080245604A1 (en) * 2006-08-29 2008-10-09 Tecumseh Power Company Passive secondary air muffler
US7775323B2 (en) * 2006-08-30 2010-08-17 Dolmar Gmbh Silencer with fin outlet
US20080164092A1 (en) * 2006-08-30 2008-07-10 Dolmar Gmbh Silencer with fin outlet
US20090255519A1 (en) * 2008-04-14 2009-10-15 Dolmar Gmbh Silencer for a motor device
US8172038B2 (en) * 2008-04-14 2012-05-08 Dolmar Gmbh Silencer for a motor device
US20120228049A1 (en) * 2011-03-09 2012-09-13 Makita Corporation Arrangement of a silencer on a combustion motor with improved coupling to the cylinder
US20120228053A1 (en) * 2011-03-09 2012-09-13 Makita Corporation Silencer for a two-stroke motor of a power tool
CN102678230A (zh) * 2011-03-09 2012-09-19 株式会社牧田 动力工具的二冲程马达用的消音器
US8517143B2 (en) * 2011-03-09 2013-08-27 Makita Corporation Arrangement of a silencer on a combustion motor with improved coupling to the cylinder
US8540051B2 (en) * 2011-03-09 2013-09-24 Makita Corporation Silencer for a two-stroke motor of a power tool
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
US11073068B2 (en) * 2018-03-13 2021-07-27 Honda Motor Co., Ltd. Exhaust device equipped with spark arrester

Also Published As

Publication number Publication date
DE10020373A1 (de) 2001-10-31
JP2001355443A (ja) 2001-12-26
FR2808303A1 (fr) 2001-11-02

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AS Assignment

Owner name: ANDREAS STIHL AG & CO., GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MENZEL, JOHANNES;REEL/FRAME:011756/0515

Effective date: 20010208

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION