EP2204557A2 - Vorrichtung zum Ablassen von Abgasen aus einem Verbrennungsmotor für tragbare Arbeitswerkzeuge - Google Patents

Vorrichtung zum Ablassen von Abgasen aus einem Verbrennungsmotor für tragbare Arbeitswerkzeuge Download PDF

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Publication number
EP2204557A2
EP2204557A2 EP09179760A EP09179760A EP2204557A2 EP 2204557 A2 EP2204557 A2 EP 2204557A2 EP 09179760 A EP09179760 A EP 09179760A EP 09179760 A EP09179760 A EP 09179760A EP 2204557 A2 EP2204557 A2 EP 2204557A2
Authority
EP
European Patent Office
Prior art keywords
terminal conduit
exhaust gases
muffler
conduit
outlet
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.)
Granted
Application number
EP09179760A
Other languages
English (en)
French (fr)
Other versions
EP2204557B1 (de
EP2204557A3 (de
Inventor
Roberto Colli
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.)
Emak SpA
Original Assignee
Emak SpA
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 Emak SpA filed Critical Emak SpA
Publication of EP2204557A2 publication Critical patent/EP2204557A2/de
Publication of EP2204557A3 publication Critical patent/EP2204557A3/de
Application granted granted Critical
Publication of EP2204557B1 publication Critical patent/EP2204557B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F01N13/08—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 ; 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
    • 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
    • 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
    • F01N2470/10—Tubes having non-circular cross section
    • 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 invention relates to a device for evacuating exhaust gases from an internal combustion engine of a type installed on mobile work tools, such as for example chainsaws, bush-cutters, portable blowers, hedge-cutters and like garden tools.
  • portable work tools can be provided with a small internal combustion engine, typically a two-stroke motor, which powers the operating implements mounted on the work tool.
  • a small internal combustion engine typically a two-stroke motor, which powers the operating implements mounted on the work tool.
  • the device comprises a usual exhaust pipe via which the exhaust gases issuing from the motor are first conveyed internally of a muffler, sometimes catalytic, which in turn exhibits an outlet mouth which opens into a small terminal conduit from which the exhaust gases flow out into the external environment.
  • safety standards exist which ideally establish a series of reference surfaces at progressive distances from the portable tool, and for each of these reference surfaces the standards fix the maximum temperature that may be measured during the functioning of the engine.
  • protective covers can be used which screen the hottest zones of the engine, such as to prevent the user or any eventual inflammable objects from coming into contact or getting excessively near to the tool.
  • One of the most intense heat sources is the device for evacuating exhaust gases.
  • the evacuation device On portable work tools the evacuation device is therefore normally covered by a protection grating, which reduces the risk of contact with the user and with any inflammable objects, while at the same time enable the exhaust gases to escape.
  • evacuation devices have been developed in which the terminal outlet conduit is able to rapidly dissipate the heat contained in the exhaust gases, such that even at short distances from the engine the temperature of the exhaust gases falls within acceptable values.
  • the prior art comprises a terminal outlet conduit from the muffler a transversal section of which is not perfectly circular but exhibits a crushed, almost elliptical shape.
  • a conduit with an almost-elliptical transversal section provides a larger heat-exchange surface for the gases with respect to a circular section, thus obtaining a greater dissipation of the heat.
  • the exhaust gases tend to exit in the form of a laminar current, for which reason they can travel relatively long distances without mixing with the external and cooler air.
  • the exhaust gases distribute on a greater contact surface with the external air, which enables a more rapid mixing of the exhaust gases with the cool external air and thus a more immediate dissipation of the heat in proximity of the outlet of the terminal conduit.
  • the above-cited conduit with the almost-elliptical section further exhibits a generally tapered shape towards the outlet, thus obtaining an increase in the velocity of the exhaust gases, which further contributes to the dissipation of the heat.
  • An aim of the present invention is thus to make available a device for evacuating exhaust gases from an internal combustion engine, which allows a more efficient dissipation of the heat contained in the exiting exhaust gases.
  • a further aim of the invention is to attain the above-mentioned objective with a simple, rational and relatively inexpensive solution.
  • a device is made available for evacuation of exhaust gases from an internal combustion engine provided at least with an outlet mouth which opens into a terminal conduit the transversal passage section of which terminal conduit exhibits a substantially bilobate shape comprising two broadened portions, reciprocally side-by-side in the direction of the width thereof and separated by an intermediate choke.
  • This effect can be attributed both to the large heat exchange surface provided for the exhaust gases by a conduit with the above-mentioned bilobate shape, and due to a significant increase in the turbulence of the outflow.
  • the transversal section of the terminal conduit is variable along a longitudinal development of the terminal conduit.
  • the terminal conduit exhibits an overall tapered shape, in which the transversal sections all have a bilobate shape but a passage area which progressively decreases towards the outlet.
  • the bush-cutter 1 comprises a cutting tool 2 which is typically constituted by a rotating disc provided with rigid blades or bands or threads of flexible nylon.
  • the cutting tool 2 is protected by an enveloping cover 3 and is borne at an end of a rigid support rod 4, which is provided with at least a grip 5 for a user to hold.
  • the bush-cutter 1 further comprises an activating engine 6, which is fixed to an end of the support rod 4 opposite the cutting tool 2, to which it is connected via a usual transmission system which passes internally of the hollow support rod 4.
  • the activating engine is an internal combustion engine, which in the illustrated example is a two-stroke single-cylinder engine.
  • the motor 6 comprises an external cover 60, an internal volume of which is subdivided by a sliding piston 61 into two chambers, an upper combustion chamber 62 and a lower compression chamber 63.
  • the sliding piston 61 is connected by a con rod 64 to a crankshaft 65, which is directly housed internally of the compression chamber 63.
  • the compression chamber 63 is in communication with a supply conduit 66, through which the mixture of air, petrol and oil is supplied.
  • the combustion chamber 62 is in communication with a exhaust pipe 67, through which the exhaust gases produced by the combustion of the mixture are evacuated to the outside.
  • the combustion chamber 62 and the compression chamber 63 are reciprocally connected by a crossflow conduit 68, afforded in the body of the engine.
  • a spark plug 69 projects into the combustion chamber 62, which spark plug 69 discharges a spark which will ignite the mixture.
  • the piston 61 When the piston 61 is in proximity of the upper endrun position, the exhaust pipe 67 and the crossflow conduit 68 are closed, while the supply conduit 66 from which the fresh mixture enters the compression chamber 63 is open. During the following descent run, the piston 61 closes the supply conduit 66 and opens the crossover conduit 68, such that the fresh mixture passes into the combustion chamber 62, at the same time pushing the exhaust gases to exit through the exhaust pipe 67.
  • the piston 61 re-closes the exhaust pipe 67 and the crossover conduit 68, such as to compress the fresh mixture in the combustion chamber 62 up to the moment in which the spark plug 69 releases the spark, when the expansion stage begins and with it a new descent run.
  • the exhaust pipe 67 opens internally of a muffler 70, which makes available a rather large chamber, in which the exhaust gases are forced to slow down, reducing their noise emission level.
  • the muffler 70 may contain a catalyser for reducing the toxicity of the exhaust gases before they are released to the outside.
  • the outlet mouth 71 opens into a terminal conduit 8, which opens directly into the outside environment.
  • the terminal conduit 8 is welded to a fastening flange 80, which is screwed to the muffler 70 with interposing of a special seal means.
  • the terminal conduit 8 is formed by an axially-developing single hollow body, a lateral wall of which exhibits two facing recesses 81 which develop in a longitudinal direction over the whole length of the terminal conduit 8.
  • the facing recesses 81 give the terminal conduit a transversal section of a substantially bilobate shape, i.e. comprising two broadened portions 82, facing width-wise and separated by an intermediate choke 83.
  • the broadened portions 82 are practically identical to one another, and have a rounded shape which in the illustrated example is elliptical, and which connects with the curved profile of the recesses 81 defining the intermediate choke 83.
  • the terminal conduit 8 offers the exhaust gases coming from the muffler 70 a greater heat exchange surface with respect to a traditional cylindrical conduit, such that the gases cool down more rapidly.
  • the bilobate shape of the transversal section especially enables the turbulence of the exhaust gases to be significantly increased, such that at the outlet the gases mix immediately with the environmental air, dissipating the majority of the transported heat.
  • the transversal passage section is not always constant but varies along the longitudinal development of the terminal conduit 8.
  • the terminal conduit 8 is substantially tapered towards the exit. This means that at each point of the longitudinal development thereof, the transversal section of the terminal conduit 8 exhibits the bilobate shape previously delineated, but has a passage area which progressively decreases starting from the inlet section 84 and going towards the outlet section 85.
  • the inlet section 84 is the one from which the exhaust gases coming from the muffler 70 enter, while the outlet section 85 is the one from which the exhaust gases exit directly into the outside environment.
  • each transversal section of the terminal conduit 8 is greater than the maximum height, i.e. than the height of the broadened portions 82 in the transversal section.
  • the area of the broadened portion 82 should preferably be greater than or equal to the outlet mouth 71 of the muffler 70.
  • the area of the broadened portions 82 should preferably be less than or equal to the area of the outlet mouth of the muffler 70.
  • the length L of the terminal conduit 8 should preferably be greater than or equal to the diameter D of the outlet mouth 71 of the muffler 7.
  • the terminal conduit 8 can be realised starting from a single tubular body made of thin metal, for example truncoconical, which is deformed in a nearing direction of two opposite generatrices, resulting in the bilobate shape.
  • the deformation can be obtained with a punching machine or other suitable tools.
  • the terminal conduit can be welded to the fastening flange 80.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Silencers (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Valve Device For Special Equipments (AREA)
EP09179760A 2008-12-30 2009-12-17 Vorrichtung zum Ablassen von Abgasen aus einem Verbrennungsmotor für tragbare Arbeitswerkzeuge Active EP2204557B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITRE2008A000121A IT1392528B1 (it) 2008-12-30 2008-12-30 Dispositivo per l ' evacuazione dei gas di scarico da un motore a combustione interna per attrezzi portatili da lavoro

Publications (3)

Publication Number Publication Date
EP2204557A2 true EP2204557A2 (de) 2010-07-07
EP2204557A3 EP2204557A3 (de) 2010-09-01
EP2204557B1 EP2204557B1 (de) 2011-10-26

Family

ID=41037578

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09179760A Active EP2204557B1 (de) 2008-12-30 2009-12-17 Vorrichtung zum Ablassen von Abgasen aus einem Verbrennungsmotor für tragbare Arbeitswerkzeuge

Country Status (3)

Country Link
EP (1) EP2204557B1 (de)
AT (1) ATE530745T1 (de)
IT (1) IT1392528B1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB568140A (en) * 1943-09-06 1945-03-20 Jean Clement Daninos Improvements in devices for damping flames from the exhaust pipes of internal combustion engines
US6164410A (en) * 1999-01-07 2000-12-26 Andreas Stihl Ag & Co. Exhaust gas muffler
DE202005013804U1 (de) * 2005-08-31 2007-01-11 Dolmar Gmbh Katalysatorkammer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB568140A (en) * 1943-09-06 1945-03-20 Jean Clement Daninos Improvements in devices for damping flames from the exhaust pipes of internal combustion engines
US6164410A (en) * 1999-01-07 2000-12-26 Andreas Stihl Ag & Co. Exhaust gas muffler
DE202005013804U1 (de) * 2005-08-31 2007-01-11 Dolmar Gmbh Katalysatorkammer

Also Published As

Publication number Publication date
ATE530745T1 (de) 2011-11-15
ITRE20080121A1 (it) 2010-06-30
IT1392528B1 (it) 2012-03-09
EP2204557B1 (de) 2011-10-26
EP2204557A3 (de) 2010-09-01

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