FR2488329A1 - Two=stroke engine exhaust silencer - has double-walled noise reduction section with cylindrical internal removable baffle - Google Patents

Two=stroke engine exhaust silencer - has double-walled noise reduction section with cylindrical internal removable baffle Download PDF

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Publication number
FR2488329A1
FR2488329A1 FR8115780A FR8115780A FR2488329A1 FR 2488329 A1 FR2488329 A1 FR 2488329A1 FR 8115780 A FR8115780 A FR 8115780A FR 8115780 A FR8115780 A FR 8115780A FR 2488329 A1 FR2488329 A1 FR 2488329A1
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FR
France
Prior art keywords
noise
wall
double
stroke engine
engine exhaust
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.)
Pending
Application number
FR8115780A
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French (fr)
Inventor
K Siemon
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.)
ZF Sachs AG
Original Assignee
Fichtel and Sachs AG
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 Fichtel and Sachs AG filed Critical Fichtel and Sachs AG
Publication of FR2488329A1 publication Critical patent/FR2488329A1/en
Pending 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
    • F01N13/14—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
    • 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
    • F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
    • 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
    • F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
    • F01N13/1894—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells the parts being assembled in longitudinal direction
    • 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

Abstract

The two-stroke engine exhaust silencer is for a motorcycle, having one portion determining the power and the other reducing the noise, its wall being cylindrical. The noise- reduction portion (2) is double-walled, having a cylindrical internal component (4) of smaller diameter. The intervening space between this and the outer wall (3) can be packed with insulating material (5), and it can have apertures (6) at intervals over its entire length. All components forming part of the noise-reduction portion can be fixed to this internal component, and arranged so that they can be fitted together with it.

Description

La présente invention concerne un pot d'échappement de moteur à deux temps, notamment pour un véhicule à deux roues motorisé, constitué entre autres par un élément qui détermine la puissance et par un élément qui amortit le bruit, dont la paroi a, pour l'essentiel, une forme cylindrique. The present invention relates to a two-stroke engine exhaust pipe, in particular for a motorized two-wheeled vehicle, constituted inter alia by an element which determines the power and by an element which dampens noise, the wall of which has, for the 'essential, a cylindrical shape.

On connait déjà, par exemple par la description qui en est faite dans la demande de brevet allemand DE-OS NO 2 907 755, des pots d'échappement de moteurs à deux temps dans lesquels un matériau d'insonorisation est placé dans une partie de ltélément qui détermine la puissance, entre la paroi extérieure cylindrique et le contre-cône perforé, pour obtenir une réduction du bruit, notamment aux fréquences élevées. We already know, for example by the description which is made in the German patent application DE-OS NO 2 907 755, exhaust pipes of two-stroke engines in which a soundproofing material is placed in a part of the element which determines the power, between the cylindrical outer wall and the perforated counter-cone, to obtain a reduction in noise, especially at high frequencies.

L'invention a pour objet de réaliser un pot d'échappement de moteur à deux temps pour véhicules à deux roues motorisés qui, au moins dans son élément amortisseur de bruit, qui est particulièrement menacé, présente une tendance aussi réduite que possible à la formation de dépôts charbonneux. L'augmentation considérable de l'intervalle entre deux entretiens consécutifs (qui peut même aller jusqu'à l'absence totale d'entretien) qui en résulte apportera une simplification capitale des soins qu'exige le maintien en bon état des véhicules à deux roues motorisés, car on sait que dans les moteurs à deux temps, principalement en regime de ralenti, les zones les plus froides du pot d' échappement présentent une forte tendance à la formation de dépôts charbonneux. The object of the invention is to produce a two-stroke engine exhaust for two-wheeled motorized vehicles which, at least in its noise-absorbing element, which is particularly threatened, exhibits a tendency as reduced as possible to formation of carbon deposits. The resulting considerable increase in the interval between two consecutive maintenance (which can even go as far as total lack of maintenance) will bring a major simplification of the care required to keep two-wheeled vehicles in good condition. motorized, because we know that in two-stroke engines, mainly in idle mode, the coldest areas of the exhaust have a strong tendency to the formation of carbon deposits.

A cet effet, dans le pot d'échappement selon l'incention, l'élément amortisseur de bruit est a double paroi grâce a l'adjonction d'un élément intérieur de forme générale cylindrique et de plus petit diamètre. La présence de cette double paroi produit un effet d'isolation thermique suffisant pour que la température intérieure de ltélément amortisseur de bruit, ctest-a-dire le silencieux, s'élève à un niveau tel qu'il empêche toute condensation et tout dépôt de résidu d'huile.  To this end, in the exhaust pipe according to the invention, the noise-absorbing element is double-walled by the addition of an internal element of generally cylindrical shape and of smaller diameter. The presence of this double wall produces a thermal insulation effect sufficient for the interior temperature of the noise damping element, that is to say the silencer, to rise to a level such that it prevents any condensation and any deposit of oil residue.

Suivant une autre caractérise de l'invention, il est avantageux que l'espace libre entre ltélément intérieur et la paroi de I'élément amortisseur de bruit soit garni d'un matériau d'isolation thermique. According to another characteristic of the invention, it is advantageous that the free space between the interior element and the wall of the noise damping element is lined with a thermal insulation material.

Il est prévu en outre de munir l'élément intérieur, d'ouvertures sur toute sa longueur, afin que le matériau d'isolation thermique, par exemple de la laine de roche ou de verre, puisse produire en outre un effet d'amortissement du bruit. It is further provided to provide the inner element with openings over its entire length, so that the thermal insulation material, for example rock wool or glass, can also produce a damping effect on the noise.

Il est avantageux, suivant une autre caractéristique de l'invention, de fixer sur ltélément intérieur toutes les pièces qui font partie de l'élément amortisseur de bruit et de les disposer de façon qu'elles puissent être au moins montées avec lui. Ceci facilite le montage et il est possible, le cas échéant, d'effectuer le montage de façon qu'un démontage ne soit plus possible, réalisant ainsi un pot d' échappement qui ne nécessite aucun entretien. It is advantageous, according to another characteristic of the invention, to fix on the internal element all the parts which form part of the noise damping element and to arrange them so that they can be at least mounted with it. This facilitates assembly and it is possible, if necessary, to perform the assembly in such a way that disassembly is no longer possible, thus producing an exhaust pipe which does not require any maintenance.

Dans une forme d'exécution avantageuse du pot d'é- chappement selon l'invention, ltélément intérieur est fixé au moyen d'un couvercle muni d'une jupe cylindrique enga gée entre la paroi de l'élément amortisseur de bruit et celle de ltélément intérieur. In an advantageous embodiment of the exhaust pot according to the invention, the internal element is fixed by means of a cover provided with a cylindrical skirt engaged between the wall of the noise damping element and that of the interior element.

Le rapport entre les diamètres respectifs de l'élé- ment intérieur et de l'élément amortisseur de bruit est compris entre 0,8 et 0,9, environ. The ratio between the respective diameters of the inner member and the noise damping element is between 0.8 and 0.9, approximately.

De toute façon, l'invention sera bien comprise à 1' aide de la description qui suit, en référence au dessin schématique annexé, dont l'unique figure est une vue en coupe longitudinale représentant, à titre d'exemple non limitatif, une forme d'exécution de ce pot d'échappement. Anyway, the invention will be better understood with the aid of the description which follows, with reference to the appended schematic drawing, the only figure of which is a view in longitudinal section showing, by way of nonlimiting example, a shape of this exhaust.

Dans cette figure, les références générales 1 et 2 désignent respectivement le pot d'échappement et ltélément amortisseur de bruit ou silencieux, qui en constitue la partie arrière. L'ensemble du pot d'échappement I est muni d'une paroi 2, qui, pour l'essentiel, a une forme cylindrique. L'élément qui détermine la puissance et qui n' est pas représenté se termine à la chicane 10, qui présen te des ouvertures Il pour le passage des gaz d'échappement. In this figure, the general references 1 and 2 respectively designate the exhaust pipe and the noise damping or silent element, which constitutes the rear part thereof. The entire muffler I is provided with a wall 2, which essentially has a cylindrical shape. The element which determines the power and which is not shown ends at the baffle 10, which has openings II for the passage of exhaust gases.

Dans la chicane 10 est fixé en outre, par exemple par soudage, concentriquement à la paroi 2, un tirant 9, sur lequel sont montés un élément intérieur 4 et les diverses pièces qui constituent le silencieux 2. Au nombre de ces pièces comptent, d'une part, les diverses cloisons 14 et, de l'autre, les tubes li montés comme passages dans ces cloisons.L'élément intérieur 4 a un diamètre extérieur qui est inférieur au diamètre intérieur de la paroi 2. L'espace libre entre l'élément intérieur 4 et la paroi 2 est garni d'un matériau isolant 5, qui sert à calorifuger l'en- semble de ltélément amortisseur de bruit 2.De plus, lté- liement intérieur 4 est muni d'ouvertures 6, de sorte que le matériau d'isolation thermique, par exemple de la laine de roche ou de verre, sert aussi à l'isolation phonique et diminue encore davantage l'intensité des bruits d'ôchap- pement. L'ensemble de l'élément intérieur 4 est fixé sur le tirant 9 et est immobilisé axialement par le tube de sortie 12 un organe de liaison étoilé 13 et un couvercle , lequel présente une jupe 8 engagée entre la paroi 2 et ltélément intérieur 4.In the baffle 10 is also fixed, for example by welding, concentrically to the wall 2, a tie rod 9, on which are mounted an internal element 4 and the various parts which constitute the silencer 2. Among these parts count, d on the one hand, the various partitions 14 and, on the other, the tubes li mounted as passages in these partitions. The internal element 4 has an external diameter which is less than the internal diameter of the wall 2. The free space between the inner element 4 and the wall 2 is lined with an insulating material 5, which is used to insulate the whole of the noise-absorbing element 2. In addition, the inner element 4 is provided with openings 6, so that the thermal insulation material, for example rock wool or glass wool, is also used for sound insulation and further reduces the intensity of exhaust noise. The whole of the internal element 4 is fixed to the tie rod 9 and is immobilized axially by the outlet tube 12, a star-shaped connecting member 13 and a cover, which has a skirt 8 engaged between the wall 2 and the internal element 4.

L'isolation thermique entre l'élément intérieur 4 et la paroi 2 empêche un refroidissement prématuré du courant des gaz d'échappement et des diverses pièces du silencieux 2. La température élevée ainsi maintenue dans ce dernier empeche une condensation intempestive et, de ce fait, le dépôt de résidus de l'huile de graissage du moteur à deux temps. On empêche ainsi, par exemple, la formation du panache bleu de fumée que produisent les moteurs à deux temps, lorsqu'ils ont tourné longtemps sous charge partielle et que, par suite d'une augmentation de la charge, ils provoquent en chauffant une vaporisation des résidus d'huile essentiellement volatils qui s'accumulent à l'intérieur du silencieux.  The thermal insulation between the internal element 4 and the wall 2 prevents premature cooling of the exhaust gas stream and of the various parts of the silencer 2. The high temperature thus maintained in the latter prevents untimely condensation and, as a result , the deposit of residues of the lubricating oil of the two-stroke engine. This prevents, for example, the formation of the blue plume of smoke produced by two-stroke engines, when they have been running for a long time under partial load and which, as a result of an increase in load, they cause by heating a vaporization essentially volatile oil residues that accumulate inside the muffler.

Claims (6)

- REVENDICATIONS- CLAIMS 1.- Pot d'échappement de moteur à deux temps, notamment pour véhicules à deux roues motorisés, constitué entre autres par un élément qui détermine la puissance et par un élément qui amortit le bruit, dont la paroi a, pour l'essentiel, une forme cylindrique, cafactérisé en ce que l'élément amortisseur de bruit (2) est à double paroi, grâce à l'adjonction d'un élément intérieur (4) de forme générale cylindrique et de plus petit diamètre. 1.- Exhaust of two-stroke engine, in particular for vehicles with two motorized wheels, constituted inter alia by an element which determines the power and by an element which dampens the noise, the wall of which has, essentially, a cylindrical shape, cafacterized in that the noise-absorbing element (2) is double-walled, thanks to the addition of an interior element (4) of generally cylindrical shape and of smaller diameter. 2.- Pot d'échappement selon la revendication 1, caractérisé en ce que l'espace libre entre l'élément intérieur (4) et la paroi (3) de l'élément amortisseur de bruit (2) est garni d'un matériau d'isolation (5). 2.- Exhaust according to claim 1, characterized in that the free space between the inner element (4) and the wall (3) of the noise damping element (2) is lined with a material insulation (5). 3.- Pot d'échappement selon la revendication 1 ou la revendication 2, caractérisé en ce que l'élément intérieur (4) est muni d'ouvertures (6) sur toute sa longueur. 3.- Exhaust according to claim 1 or claim 2, characterized in that the inner element (4) is provided with openings (6) over its entire length. 4.- Pot d'échappement selon l'une quelconque des revendications i à 3, caractérisé en ce que toutes les pièces (14, 15) qui font partie de l'élément amortisseur de bruit (2) sont fixées sur ltélément intérieur (4) et sont disposées de façon qu'elles puissent être au moins montées avec lui. 4.- Exhaust according to any one of claims i to 3, characterized in that all the parts (14, 15) which are part of the noise damping element (2) are fixed on the inner element (4 ) and are arranged so that they can be mounted with it at least. 5.- Pot d'échappement selon l'une quelconque des revendications i à 4, caractérisé en ce que l'élément intérieur (4) est fixé au moyen d'un couvercle (7) muni d'une jupe (8) engagée entre la paroi (3) de ltélément amortisseur de bruit et celle de l'élément intérieur (4).  5.- Exhaust according to any one of claims i to 4, characterized in that the inner element (4) is fixed by means of a cover (7) provided with a skirt (8) engaged between the wall (3) of the noise damping element and that of the interior element (4). 6.- Pot d'échappement selon l'une quelconque des revendications 1 à 5, caractérisé en ce que le rapport entre les diamètres respectifs de ltélément intérieur (4) et de la paroi (3) de ltélément amortisseur de bruit (2) est compris entre 0,8 et 0,9, environ.  6.- Exhaust according to any one of claims 1 to 5, characterized in that the ratio between the respective diameters of the inner element (4) and the wall (3) of the noise damping element (2) is between 0.8 and 0.9, approximately.
FR8115780A 1980-08-11 1981-08-10 Two=stroke engine exhaust silencer - has double-walled noise reduction section with cylindrical internal removable baffle Pending FR2488329A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19808021494U DE8021494U1 (en) 1980-08-11 1980-08-11 EXHAUST Muffler FOR A TWO-STROKE INTERNATIONAL ENGINE

Publications (1)

Publication Number Publication Date
FR2488329A1 true FR2488329A1 (en) 1982-02-12

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FR8115780A Pending FR2488329A1 (en) 1980-08-11 1981-08-10 Two=stroke engine exhaust silencer - has double-walled noise reduction section with cylindrical internal removable baffle

Country Status (4)

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DE (1) DE8021494U1 (en)
ES (1) ES259988Y (en)
FR (1) FR2488329A1 (en)
IT (2) IT1144628B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108643272A (en) * 2018-05-22 2018-10-12 孔李南 A kind of coal mine excavator system with environmentally friendly denoising device
US20210156287A1 (en) * 2019-11-27 2021-05-27 Eberspächer Exhaust Technology GmbH Exhaust muffler

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2967390B2 (en) * 1994-04-21 1999-10-25 本田技研工業株式会社 Muffler and manufacturing method thereof
DE10353594B4 (en) * 2003-11-17 2013-08-01 Friedrich Boysen Gmbh & Co. Kg silencer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2834425A (en) * 1954-04-02 1958-05-13 Grand Sheet Metal Products Co Exhaust muffler
FR1249938A (en) * 1959-11-24 1961-01-06 Exhaust silencer with side gas inlet
FR1573620A (en) * 1967-11-15 1969-07-04
FR2233872A5 (en) * 1973-06-12 1975-01-10 Gutbrod S A I.C. engine silencer with aluminium base lining - has metal lining support mesh and internal baffles and tubes
FR2312644A1 (en) * 1975-05-30 1976-12-24 Vmw Ranshofen Berndorf Ag EXHAUST SYSTEM

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2834425A (en) * 1954-04-02 1958-05-13 Grand Sheet Metal Products Co Exhaust muffler
FR1249938A (en) * 1959-11-24 1961-01-06 Exhaust silencer with side gas inlet
FR1573620A (en) * 1967-11-15 1969-07-04
FR2233872A5 (en) * 1973-06-12 1975-01-10 Gutbrod S A I.C. engine silencer with aluminium base lining - has metal lining support mesh and internal baffles and tubes
FR2312644A1 (en) * 1975-05-30 1976-12-24 Vmw Ranshofen Berndorf Ag EXHAUST SYSTEM

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108643272A (en) * 2018-05-22 2018-10-12 孔李南 A kind of coal mine excavator system with environmentally friendly denoising device
US20210156287A1 (en) * 2019-11-27 2021-05-27 Eberspächer Exhaust Technology GmbH Exhaust muffler
US11795847B2 (en) * 2019-11-27 2023-10-24 Purem GmbH Exhaust muffler

Also Published As

Publication number Publication date
IT8153524V0 (en) 1981-08-06
IT1144628B (en) 1986-10-29
ES259988U (en) 1982-06-01
ES259988Y (en) 1982-12-01
DE8021494U1 (en) 1980-11-20
IT8168097A0 (en) 1981-08-06

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