EP2497932A1 - Moteur à deux temps doté d'un amortisseur de bruit - Google Patents

Moteur à deux temps doté d'un amortisseur de bruit Download PDF

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Publication number
EP2497932A1
EP2497932A1 EP12158255A EP12158255A EP2497932A1 EP 2497932 A1 EP2497932 A1 EP 2497932A1 EP 12158255 A EP12158255 A EP 12158255A EP 12158255 A EP12158255 A EP 12158255A EP 2497932 A1 EP2497932 A1 EP 2497932A1
Authority
EP
European Patent Office
Prior art keywords
piston
chamber
stroke engine
muffler
flow channel
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Withdrawn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
EP12158255A
Other languages
German (de)
English (en)
Inventor
Michael Schönfeld
Christian Kellermann
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.)
Makita Corp
Original Assignee
Makita Corp
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 Makita Corp filed Critical Makita Corp
Publication of EP2497932A1 publication Critical patent/EP2497932A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • two-stroke engines of the present type are designed for use in engine working devices with pistons which have the lowest possible weight. For this purpose, it is regularly provided to bring in the piston skirt window to save further weight to form the piston. In particular, openings are provided in the area of the piston pins, which serve for the articulated connection of the piston with the connecting rod, in order to further reduce the piston mass.
  • window pistons are commonly used in the construction of two-stroke engines for the present application, and according to the invention, the use of such window pistons is dispensed with and it is proposed to use pistons with a closed piston skirt.
  • a piston pin For articulated connection of the piston with the connecting rod, a piston pin is usually provided, wherein according to an advantageous embodiment, the piston skirt is executed closed at least from its upper piston edge to below the piston pin.
  • the piston with closed piston skirt can have a cylindrical basic shape, and the piston edge forms the top of the piston, which limits the piston surface radially, which in turn limits the combustion chamber of the two-stroke engine movable. Consequently, the piston edge also forms the edge which opens and closes the opening of the combustion chamber in the direction of the muffler by the stroke movement of the piston.
  • the advantages of using a closed piston skirt can already be given when the piston skirt is closed at least in the region from the upper edge to below the piston pin.
  • the piston pin is thereby located approximately at half the height of the piston between the piston edge and the lower end edge of the piston, which limits the piston downwards and the piston edge is arranged opposite to the top of the piston.
  • the piston skirt may have a lower-side end edge, which is formed rotationally symmetrical circumferential and has a constant over the circumference of the piston distance to the piston edge.
  • the piston may correspond to the basic shape of a cylinder, and the circular end edge is formed parallel to the piston edge, which closes the top of the piston skirt.
  • the end edge can have indentations, wherein the regions of the indentations are preferably formed by the regions in which the openings are made in the piston skirt.
  • the areas of the recesses, which are formed opposite the piston, in the extension direction of the piston pin are formed opposite the piston, in the extension direction of the piston pin.
  • Both the flats and the recesses in the trailing edge on the underside of the piston form the areas of the piston which are located laterally to the outlet and in particular also to the inlet in the cylinder of the two-stroke engine.
  • the areas of the piston that open and close the outlet towards the muffler, but also the inlet for the entry of the fuel-air mixture from the crankcase by the lifting movement in the cylinder are formed by the areas of the piston that neither flats nor indentations in the Have the end edge of the piston.
  • the invention provides that the areas adjacent to the areas of the piston, which open and close the openings in the cylinder by the lifting movement, are windowless.
  • FIG. 1 shows a two-stroke engine 100 in a schematic, cross-sectional view, and the two-stroke engine 100, a muffler 10 is attached.
  • the two-stroke engine 100 has a cylinder 18 in which a combustion chamber 13 is formed.
  • the combustion chamber 13 is movably bounded by the piston 21, which is connected via a connecting rod 23 with a crankshaft 22 to form a crank mechanism, and the crankshaft 22 is mounted in a crankcase 24.
  • an outlet is arranged, on which the muffler 10 is flanged via a muffler inlet 11 in a manner not shown in detail. If the piston 21 is in the region of the bottom dead center, the piston 21 releases the outlet of the combustion chamber 13 and the exhaust gas can pass from the combustion chamber 13 through the muffler inlet 11 into the muffler 10.
  • the flow channel 12 extends in a straight training between the first chamber 15 and the muffler inlet 11, and is thus designed so aerodynamic that the exhaust gas flowing into the muffler inlet 11 due to its inertia predominantly flows into the first chamber 15 and generates an overpressure in this.
  • the exhaust gas can flow back toward the silencer inlet 11, and thereby form a back pressure against the combustion chamber 13. This avoids that fuel-air mixture passes unburned in the muffler 10 or already in the muffler 10 occurred fuel-air mixture is pushed back into the combustion chamber 13. Only after backflow of the exhaust gas against the outlet of the combustion chamber 13, the exhaust gas can leave the flow channel 12 and the first chamber 15 through a main outlet 17 and enter the second chamber 16.
  • the exhaust gas finally leaves the muffler 10 through an outlet 19 introduced in the second chamber 16, and the exhaust gas can escape through the outlet 19.
  • FIG. 3 shows a piston 21 in various half sections with features of the present invention.
  • the piston skirt 25 is designed to be closed except for the opening 28 for receiving the piston pin 26, and extends from the upper-side piston edge 27 to the lower-side end edge 31. Slightly below the upper-side piston edge 27, the piston 21 has an annular groove 33 for receiving piston rings.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP12158255A 2011-03-09 2012-03-06 Moteur à deux temps doté d'un amortisseur de bruit Withdrawn EP2497932A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202011000528U DE202011000528U1 (de) 2011-03-09 2011-03-09 Zweitaktmotor mit einem Schalldämpfer

Publications (1)

Publication Number Publication Date
EP2497932A1 true EP2497932A1 (fr) 2012-09-12

Family

ID=45819037

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12158255A Withdrawn EP2497932A1 (fr) 2011-03-09 2012-03-06 Moteur à deux temps doté d'un amortisseur de bruit

Country Status (4)

Country Link
US (1) US20120241248A1 (fr)
EP (1) EP2497932A1 (fr)
CN (1) CN102678380B (fr)
DE (1) DE202011000528U1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012120037A2 (fr) * 2011-03-09 2012-09-13 Makita Corporation Moteur à deux temps équipé d'un silencieux

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2745849A1 (fr) * 1996-03-08 1997-09-12 Honda Motor Co Ltd Moteur a combustion interne a deux temps, a allumage par etincelles et a precompression dans la chambre de vilebrequin
US20070113734A1 (en) * 2005-11-23 2007-05-24 Andreas Stihl Ag & Co. Kg Piston for a two-stroke engine and a method of making the same
US20090095269A1 (en) * 2005-12-28 2009-04-16 Zenoah Co., Ltd. Two-Cycle Engine
DE202008005168U1 (de) 2008-04-14 2009-08-27 Dolmar Gmbh Schalldämpfer für ein Motorgerät
US20100024759A1 (en) * 2008-07-31 2010-02-04 Dobransky Gary E Two-stroke engine

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2720193A (en) * 1950-03-24 1955-10-11 Maybach Karl Oil cooled piston for high speed internal combustion engines
US3056638A (en) * 1961-01-23 1962-10-02 Gen Motors Corp Piston and connecting rod assembly
US3204619A (en) * 1962-07-02 1965-09-07 American Mach & Foundry Internal combustion engine
BE649108A (fr) * 1963-06-10
US3257997A (en) * 1965-02-04 1966-06-28 Mcculloch Corp Piston for internal combustion engine
US3442184A (en) * 1967-09-15 1969-05-06 Arnold J Pritchard Piston pin silencer
DE2557262A1 (de) * 1975-12-19 1977-06-30 Schmidt Gmbh Karl Kolben und zylinder fuer zweitakt- brennkraftmaschinen
DE2643240A1 (de) * 1976-09-25 1978-04-06 Stihl Maschf Andreas Schalldaempfer, insbesondere fuer tragbare motorkettensaegen
DE3100851A1 (de) * 1981-01-14 1982-08-12 Norbert Dipl.-Ing. 3014 Laatzen Kania "verfahren zur geraeuschminderung beim betrieb von schlitzgesteuerten zweitaktbrennkraftmaschinen, insbesondere fuer kettensaegen und zweitaktbrennkraftmaschinen zur durchfuehrung des verfahrens"
US4779703A (en) * 1987-04-06 1988-10-25 Honda Giken Kogyo Kabushiki Kaisha Silencing device for internal combustion engine
JP2876563B2 (ja) * 1990-07-31 1999-03-31 ヤマハ発動機株式会社 ２サイクルディーゼルエンジン
JPH08118967A (ja) * 1994-10-27 1996-05-14 Yamaha Motor Co Ltd エンジンの車載構造
JPH08144842A (ja) * 1994-11-24 1996-06-04 Yamaha Motor Co Ltd ディーゼルエンジン
US5794605A (en) * 1995-03-07 1998-08-18 Sanshin Kogyo Kabushiki Kaisha Fuel control for marine engine
US5769041A (en) * 1996-04-26 1998-06-23 Yamaha Hatsudoki Kabushiki Kaisha Two cycle fuel injection engine
JP2001065412A (ja) * 1999-08-26 2001-03-16 Sanshin Ind Co Ltd エンジン
AT413233B (de) * 2000-07-03 2005-12-15 Verdichter Oe Ges M B H Kolbenfreistellung
US20050039708A1 (en) * 2003-08-08 2005-02-24 Green William Delaplaine Piston exhaust system
DE202005005328U1 (de) * 2005-04-04 2006-08-10 Dolmar Gmbh Zweitaktmotor
EP2021606B1 (fr) * 2006-05-12 2019-06-12 Husqvarna AB Méthode pour régler le ratio air-carburant d'un moteur à combustion interne

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2745849A1 (fr) * 1996-03-08 1997-09-12 Honda Motor Co Ltd Moteur a combustion interne a deux temps, a allumage par etincelles et a precompression dans la chambre de vilebrequin
US20070113734A1 (en) * 2005-11-23 2007-05-24 Andreas Stihl Ag & Co. Kg Piston for a two-stroke engine and a method of making the same
US20090095269A1 (en) * 2005-12-28 2009-04-16 Zenoah Co., Ltd. Two-Cycle Engine
DE202008005168U1 (de) 2008-04-14 2009-08-27 Dolmar Gmbh Schalldämpfer für ein Motorgerät
US20100024759A1 (en) * 2008-07-31 2010-02-04 Dobransky Gary E Two-stroke engine

Also Published As

Publication number Publication date
CN102678380A (zh) 2012-09-19
US20120241248A1 (en) 2012-09-27
CN102678380B (zh) 2016-12-14
DE202011000528U1 (de) 2012-06-12

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