EP1308608B1 - Système d'échappement d'un moteur - Google Patents

Système d'échappement d'un moteur Download PDF

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Publication number
EP1308608B1
EP1308608B1 EP20010126233 EP01126233A EP1308608B1 EP 1308608 B1 EP1308608 B1 EP 1308608B1 EP 20010126233 EP20010126233 EP 20010126233 EP 01126233 A EP01126233 A EP 01126233A EP 1308608 B1 EP1308608 B1 EP 1308608B1
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EP
European Patent Office
Prior art keywords
exhaust gas
expansion chamber
engine
muffler
purifier
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.)
Expired - Lifetime
Application number
EP20010126233
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German (de)
English (en)
Other versions
EP1308608A1 (fr
Inventor
Hidenori Mukaida
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.)
Hiraoka Manufacturing Co Ltd
Original Assignee
Hiraoka Manufacturing 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 Hiraoka Manufacturing Co Ltd filed Critical Hiraoka Manufacturing Co Ltd
Priority to DE2001629989 priority Critical patent/DE60129989T2/de
Priority to EP20010126233 priority patent/EP1308608B1/fr
Publication of EP1308608A1 publication Critical patent/EP1308608A1/fr
Application granted granted Critical
Publication of EP1308608B1 publication Critical patent/EP1308608B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • F01N13/185—Mechanical joints the connection being realised 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
    • 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
    • F01N1/084—Silencing apparatus characterised by method of silencing by reducing exhaust energy by throttling or whirling the gases flowing through the silencer two or more times longitudinally in opposite directions, e.g. using parallel or concentric tubes
    • 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
    • F01N13/14—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 having thermal insulation
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
    • F01N3/2885—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices with exhaust silencers in a single 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
    • 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
    • F01N2450/24—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
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus

Definitions

  • the present invention relates to a muffler applied for smaller engines.
  • Mufflers applied for the smaller engines used in conventional brush cutters or chain saws are constructed such that, as shown in FIG.1, an exhaust gas first expansion chamber 2 having an exhaust gas inlet 1 connecting to an exhaust gas outlet of the engine (not shown in the figure) and an exhaust gas second expansion chamber 4 having an exhaust gas outlet 3, the first expansion chamber 2 and the second expansion chamber 4 being separated by a partition board, a part of the partition board being removed to install an exhaust gas purifier 5 made of stainless steel and coated with a catalyst to purify the gas passing through the purifier 5.
  • Said purifier is provided with a plurality of honeycomb-like small holes.
  • JP 2000-018028 describes a conventional muffler constructed such that, as shown in FIG.2, the exhaust gas first expansion chamber 2 having the exhaust gas inlet 1 connecting to the exhaust gas outlet of the engine and the exhaust gas second expansion chamber 4 having an exhaust gas outlet 3, an exhaust gas receiver 6 located in the first expansion chamber 2 and one end of the exhaust gas receiver 6 is closed and the other end of which being opened, said exhaust gas receiver 6 being provided with a plurality of through holes 6b and the open end of which being placed facing to the exhaust gas inlet 1 in the first expansion chamber 2 and the first expansion chamber and the second expansion chamber 4 being separated with a partition board, one part of the partition board being removed and an exhaust gas purifier 5 made of stainless steel and coated with a catalyst to purify the exhaust gas passing through the honeycomb small holes is applied.
  • an exhaust gas of the engine is introduced into the first gas expansion chamber 2 through the gas inlet 1, passing through the exhaust gas purifier 5 provided in the chamber and the exhaust gas is introduced into the second expansion chamber 4 and the gas is exhausted to the atmosphere through the exhaust gas outlet 3. Accordingly, an outside wall 2a of the first expansion chamber 2 and an outside wall 4a of the second expansion chamber 4 are heated up to approximately 700 ⁇ 800 °C by the heat of the exhaust gas.
  • the muffler is installed to the engine it is required to provide a metallic cover plate 7 at a position with a predetermined distance from the outside wall 4a and further it is required to install a heat durable plastic cover plate 8 at a position with another predetermined distance from the metallic cover plate 7. Accordingly, an exterior shape of the muffler becomes larger against a tendency to make the engine assembly smaller.
  • one open end of the exhaust gas receiver 6 provided with a plurality of gas through holes 6b on a cylindrical surface 6a is placed facing to the exhaust gas inlet 1 to increase an efficiency to absorb the sound of the muffler. Incomplete combustion gasses are burnt and generation of unfavorable carbon monoxide or nitrogen oxides is controlled.
  • the object of the present invention is to offer an improved engine muffler to keep the outside wall of the second expansion chamber not to become hotter.
  • a muffler provided with a first expansion chamber 12 of the exhaust gas provided with an exhaust gas inlet 11 connecting to an exhaust gas outlet aperture of the 2 cycle or the 4 cycle engine, a second expansion chamber 14 provided with a gas exhaust outlet 13, the first expansion chamber 12 and the second expansion chamber 14 are separated with a partition board 20, a part of which being cut out to place a first exhaust gas purifier 15 coated with a catalyst to purify the exhaust gas, the purifier 15 is provided with a number of small holes.
  • the wall that does not face to the engine of said second expansion chamber 14 is made as a double-wall construction having a wall 14a and a wall 14b with a predetermined distance between them. It is of course possible to have a double wall construction having a wall 12a and a wall 12b as shown in FIG.4A.
  • the muffler is also explained with reference to FIG.5A that the double walls 12a and 12b, 14a and 14b are packed with a heat insulating material to enhance the heat insulating efficiency.
  • the engine muffler is devised as illustrated with reference to FIG.6.
  • a cover plate 17 provided with one open aperture at a place surrounding the exhaust gas purifier 15 in the first expansion chamber 12 for the engine of 2 cycle or 4 cycle type illustrated in FIG.3 and another cover plate 17 surrounding said gas purifier 15 in the second expansion chamber 14 provided with one open aperture at a place surrounding the exhaust gas purifier 15 in the second expansion room 14 are added.
  • a gas introducing aperture is provided in the first expansion chamber 12 and a gas exhausting aperture is provided in the second expansion chamber 14.
  • the flow of gas is rectified to store the heat within the cover plate 17 and the cover plate 17' to prevent the heat from being transferred to the outside walls.
  • the engine muffler in accordance with a further example useful to understand the present invention is illustrated with reference to FIG.7. Said engine muffler is improved compared to the ones shown in FIG.3 and FIG.6.
  • a part of the double walls 14a and 14b in the second expansion chamber 14 is removed to provide an open aperture 14c through which the exhaust gas is partly released outside.
  • the outside wall 14' is fastened to a cover plate 19 with a bolt and a nut.
  • a cover plate 17' for the exhaust gas purifier 15 in the second expansion chamber 14 is fastened to the partition board 20 with a bolt and a nut. If required, the cover plates 14' and 17' are unfastened to take out the exhaust gas purifier 15 for replacement or cleaning. This model change is done to assist the life of the exhaust gas purifier 15.
  • a distance between the cover plate 17 in the first expansion chamber 12 and the exhaust gas purifier 15 is widened. Meanwhile, a distance between the cover plate 17' in the second expansion chamber 14 and both sides of the exhaust gas purifier 15 is made nil. By this construction it becomes easier to take out the exhaust gas purifier 15 from the second expansion chamber 14. It is also easy to put back the exhaust gas purifier 15 to the place where it is located in the first expansion chamber 12.
  • the muffler illustrated in FIG.4A is reconstructed to have the cover plates 17 and 17' as illustrated in FIG.8. It is also reconstructed to have the double walls construction such as walls 12a, 12b and 14a, 14b.
  • Figs. 9 to 12 show further examples useful to understand the present invention.
  • the muffler in FIG.9 is made to have the double walls 12a, 12b and 14a, 14b and packed with the heat insulating material 16 to improve the heat insulating efficiency much more.
  • the muffler in FIG.10 is provided with a second exhaust gas purifier 18 to the muffler shown in FIG.4A to improve exhaust gas purification efficiency, to eliminate muffler's sound and to improve the heat insulation efficiency.
  • the muffler in FIG.11 is provided with an improved second exhaust gas purifier 18.
  • the purifier 18 is located nearer the exhaust gas inlet 11.
  • the muffler in FIG.12 is manufactured to have its closed end of the second exhaust gas purifier 18 welded onto the partition board 20.
  • the heat insulation material 16 is packed between the walls 12a, 12b and 14a, 14b,respectively.
  • FIG. 13 An embodiment of the present invention is shown in Fig. 13.
  • the muffler in FIG.13 is improved by covering the circumference of the first exhaust gas purifier 15 with the cover plates 17 and 17' of the muffler shown in FIG.12.
  • FIG. 14 A further embodiment of the present invention is shown in Fig. 14.
  • the muffler in FIG.14 is packed with the heat insulating material 16 between the walls 12a, 12b and 14a, 14b shown in FIG.13.
  • FIG.1 is a vertical cross sectional view of the conventional engine muffler.
  • FIG.2 is a vertical cross sectional view of the conventional engine muffler.
  • FIG.3 is a vertical cross sectional view of an example useful to understand the present invention.
  • FIG.4A is a vertical cross sectional view of the engine muffler of another example useful to understand the present invention.
  • FIG.4B is a vertical cross sectional view of the engine muffler of another example useful to understand the present invention when there is no particular restriction in gas purification concentration degree.
  • FIG.5A is a vertical cross sectional view of the engine muffler of another example useful to understand the present invention.
  • FIG.5B is a vertical cross sectional view of the engine muffler of another example useful to understand the present invention when there is no particular restriction in gas purification concentration degree existed.
  • FIG.6 is a vertical cross sectional view of the engine muffler of another example useful to understand the present invention.
  • FIG.7 is a vertical cross sectional view of the engine muffler of another example useful to understand the present invention.
  • FIG.8 is a vertical cross sectional view of the engine muffler of another example useful to understand the present invention.
  • FIG.9 is a vertical cross sectional view of the engine muffler of another example useful to understand the present invention.
  • FIG.10 is a vertical cross sectional view of the engine muffler of another example useful to understand the present invention.
  • FIG.11 is a vertical cross sectional view of another example useful to understand the present invention.
  • FIG.12 is a vertical cross sectional view of another example useful to understand the present invention.
  • FIG.13 is a vertical cross sectional view of an embodiment according to the present invention.
  • FIG.14 is a vertical cross sectional view of another embodiment according to the present invention.
  • FIG.3 ⁇ 1 4 are made to illustrate a configuration of the engine muffler, a flow passage of the exhaust gas, configuration and location of the apertures.
  • FIG.3 and FIG.4A Now an example useful to understand the present invention is explained with reference to the accompanied drawings FIG.3 and FIG.4A.
  • a muffler body 19 is partitioned with a partition board 20 and a first expansion chamber 12 and a second expansion chamber 14 are formed, respectively.
  • An exhaust gas inlet 11 connecting to a gas exhaust outlet (not shown) of the 2 cycle or the 4 cycle engine is provided in an upper part of the first expansion chamber 12 shown to the left side of the second expansion chamber 14. Meanwhile, an exhaust gas outlet 13 is provided in an upper part of the second expansion chamber 14 shown in the right side of the first expansion chamber 12.
  • At least one first exhaust gas purifier 15 coated with a catalyst such as platinum or rhodium, etc. is provided.
  • the first exhaust gas purifier 15 is made of stainless steel and has honeycomb like small holes.
  • the first exhaust gas purifier 15 is located between the first expansion chamber 12 and the second expansion chamber 14. Double walls 14a and 14b with a predetermined distance between them and located in said second expansion chamber 14 which is not the side to face to the engine are added. Further, as shown in FIG.4A, the walls which directly face to the engine in the first expansion chamber 12 are manufactured to improve the heat insulating efficiency. If there is no particular restriction in the exhaust gas purification concentration degree existed, a catalyst in the honeycomb purifier is not necessarily applied as shown in FIG.4B.
  • FIG.5B The construction illustrated in FIG.5B is the one that the heat insulating material is packed between the double walls 12a, 12b and 14a, 14b as illustrated in FIG.4B.
  • the engine muffler shown in FIG.6 is manufactured to have a cover plate 17 around the left side of the first gas purifier 15 as illustrated in FIG.3 to prevent the heat radiation from said first gas purifier 15 and also provide a cover plate 17' around the right side of said first exhaust gas purifier 15 to prevent the heat radiation from said first exhaust gas purifier 15.
  • it is required to manufacture the partition board 20 and the cover plate 17 as an integral unit to simplify the manufacturing process.
  • the engine muffler shown in FIG.7 is the one to improve the construction of the muffler illustrated in FIG.6.
  • the cover plate 17' in the second exhaust gas expansion chamber 14 is detachably fastened to the partition board 20 with a bolt and a nut. Apart of the double walls 14a and 14b in the second expansion chamber 14 is partly removed to place an exhaust gas introduction outlet 14c.
  • a plate 14' of the introduction aperture 14c is detachably fastened to the double walls with a bolt and a nut.
  • As inside the muffler is heated up to approximately 700 ⁇ 800 degrees and contaminated with oil. It is recommended to detachably provide the exhaust purifier 15 to the muffler to clean said exhaust gas purifier 15 to take out for replacement or cleaning.
  • the partition board 20 and the cover plate 17 in the first expansion chamber 12 are made to an integral unit construction, a predetermined distance is provided between the cover plate 17 and the exhaust gas purifier 15. In the meantime, the distance between the cover plate 17' in the second expansion chamber 14 and both sides of the exhaust gas purifier 15 is made nil as shown in the figure. It becomes easier to take out the exhaust gas purifier 15 from the second expansion chamber 14 and also it becomes easier to return the exhaust gas purifier 15 to its original position in the first expansion chamber 12 after cleaning.
  • the cover plates 17, 17' are made into an integral unit taking into consideration the manufacturing process and interchangeability of the products. It is recommended that the exhausting gas inlet 17a of the cover plate 17 is located lower and the gas outlet 17a' of the cover plate 17' is located upper.
  • packing the heat insulating material 16 in the double walls further enhances the heat insulation efficiency. This construction will prevent the heat radiation toward outside the engine.
  • a second exhaust gas purifier 18 coated with a catalyst to purify the exhaust gas on the surface of the purifier provided with a plurality of through holes in addition to the first exhaust gas purifier 15 is recommended.
  • the second exhaust gas purifier 18 is coated with the catalyst on its uneven recesses.
  • the cylindrical purifier 18 has one side having an open aperture facing to the exhaust gas inlet 11 is located in the first expansion chamber 12.
  • said second exhaust gas purifier 18 is attached to said partition board 20 by means of welding or, as shown in FIG.11, the open aperture end of the recessed surface 18a is connected to the exhaust gas inlet 11. Further, the rear surface and the front surface of the second exhaust gas purifier 18 to support a supporting bar 18b (front side of the supporting bar is not shown) is held and there is the exhausted gas purifier 18 and the partition board 20 to form an exhaust gas passage between the end part of the second gas purifier 18 and the partition board 20.
  • the heat insulating material 16 selected from a group of the heat insulating materials, such as alumina, glass wool, ceramic wool, mineral fiber, etc. is packed in the double walls.
  • the heat to the double walls is decreased and the heat insulating efficiency is enhanced.
  • cover plates 17 and 17' It is convenient to form an integral unit to manufacture the cover plates 17 and 17' taking into consideration of the interchangeability. It is recommended that the flowing entrance 17a of the exhaust gas of the cover plate 17 is located lower and a flowing outlet 17a' of the exhaust gas of the cover plate 17 is located upper to cover the first exhaust gas purifier 15. Such construction of the attachment of the cover plates 17 and 17' will make the exhaust gas flow slower and exhaust gas purification efficiency by the first exhaust gas purifier 15 will be increased and also sound elimination effect will be enhanced.
  • the present invention has been made with the conventional troubles in mind and manufacture of the muffler with a double-wall construction with a predetermined distance between the wall surfaces in the second expansion chamber of the 2 cycle or the 4 cycle engine.
  • the air between the double walls enhances the heat insulating efficiency to decrease the heat transfer toward the outside placed double-walls construction.
  • the problems occurred in the conventional art such as disturbing decreasing the outside configuration by placing the metallic cover and further place the heat durable plastic cover with a predetermined distance.
  • the double-wall construction in the second expansion chamber with a predetermined distance is placed on the portion to which the engine is not installed and further the double-wall construction packed with a heat insulating material. This construction makes the heat efficiency larger and decreases transfer of the heat to the outside of the second expansion chamber.
  • the first expansion chamber of the first exhaust gas purifier is covered with a cover plate having the exhaust gas inlet aperture and also to cover the first exhaust gas purifier in the second expansion chamber side with the cover plate having the exhaust gas outlet aperture, the flow of gas is rectified and retarded and purification efficiency, sound elimination efficiency and heat insulating efficiency by the first exhaust gas purifier is increased.
  • the first exhaust gas purifier is detachably installed to take out from the muffler and to return said first exhaust gas purifier to the place where it was located or cleaning. The life of the first exhausting gas purifier becomes longer.
  • the wall of the second expansion chamber to which the engine is not installed makes the wall to a double- wall construction with a predetermined distance, and further a heat insulating material is packed between the walls, the heat of the double walls outside of said second expansion chamber is further decreased.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)

Claims (4)

  1. Silencieux pour moteur, comportant :
    une première chambre de détente (12) ayant une entrée de gaz d'échappement (11) reliée à une sortie de gaz d'échappement d'un moteur;
    une deuxième chambre de détente (14) ayant une sortie de gaz d'échappement (13); et
    un premier purificateur de gaz d'échappement (15) revêtu d'un catalyseur et ayant une multiplicité de petits trous afin de purifier les gaz d'échappement, le premier purificateur de gaz d'échappement (15) étant disposé entre les première et deuxième chambres de détente (12, 14),
    une paroi de la deuxième chambre de détente (14) qui ne fait pas face au moteur ayant des doubles parois (14a, 14b) avec une distance prédéterminée entre elles,
    caractérisé en ce que le silencieux pour moteur comprend en outre :
    une première plaque de couvercle (17) ayant une ouverture d'entrée de gaz d'échappement (17a) et recouvrant une face d'entrée du premier purificateur de gaz d'échappement (15) dans la première chambre de détente (12);
    une deuxième plaque de couvercle (17') ayant une ouverture de sortie de gaz d'échappement (17a') et recouvrant une face de sortie du premier purificateur de gaz d'échappement (15) dans la deuxième chambre de détente (14); et
    un deuxième purificateur de gaz d'échappement (18) situé dans ladite première chambre de détente (12) et revêtu d'un catalyseur afin de purifier les gaz d'échappement par l'intermédiaire d'une multiplicité de trous débouchants prévus sur une surface renfoncée irrégulière (18a) du deuxième purificateur, une extrémité ouverte du deuxième purificateur de gaz d'échappement (18) étant orientée vers l'entrée de gaz d'échappement (11).
  2. Silencieux pour moteur selon la revendication 1, dans lequel la paroi de la première chambre de détente (12) face au moteur a également des doubles parois (12a, 12b) avec une distance prédéterminée entre elles.
  3. Silencieux pour moteur selon la revendication 1 ou 2, dans lequel une matière thermiquement isolante (16) est bourrée entre les doubles parois (12a, 12b; 14a, 14b).
  4. Silencieux pour moteur selon l'une quelconque des revendications précédentes, comportant en outre une plaque de séparation (20) qui sépare la première chambre de détente (12) de la deuxième chambre de détente (14).
EP20010126233 2001-11-05 2001-11-05 Système d'échappement d'un moteur Expired - Lifetime EP1308608B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE2001629989 DE60129989T2 (de) 2001-11-05 2001-11-05 Schalldämpfer eines Motors
EP20010126233 EP1308608B1 (fr) 2001-11-05 2001-11-05 Système d'échappement d'un moteur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20010126233 EP1308608B1 (fr) 2001-11-05 2001-11-05 Système d'échappement d'un moteur

Publications (2)

Publication Number Publication Date
EP1308608A1 EP1308608A1 (fr) 2003-05-07
EP1308608B1 true EP1308608B1 (fr) 2007-08-15

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EP20010126233 Expired - Lifetime EP1308608B1 (fr) 2001-11-05 2001-11-05 Système d'échappement d'un moteur

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DE (1) DE60129989T2 (fr)

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
AT510788B1 (de) * 2010-10-28 2012-10-15 Avl List Gmbh Abgasschalldämpferanordnung
CN106762078B (zh) * 2017-03-24 2019-02-05 湖州新兴汽车部件有限公司 一种新型消音器
CN108979819B (zh) * 2018-09-25 2024-03-22 清华大学 一种小型通用发动机后处理系统
JP2022163291A (ja) * 2021-04-14 2022-10-26 株式会社やまびこ 層状掃気式エンジン用マフラ

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Publication number Priority date Publication date Assignee Title
US5521339A (en) * 1994-11-18 1996-05-28 Wci Outdoor Products, Inc. Catalyst muffler system
JP3816581B2 (ja) * 1996-06-21 2006-08-30 株式会社共立 内燃エンジンのマフラー
SE9703582L (sv) * 1997-10-01 1999-04-02 Electrolux Ab Katalysatorljuddämpare
JP3814081B2 (ja) * 1998-06-30 2006-08-23 新ダイワ工業株式会社 エンジンのマフラー

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DE60129989D1 (de) 2007-09-27
DE60129989T2 (de) 2008-05-15

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