EP1867844B1 - Silencieux pourvue d'une vanne de régulation de gaz d'échappement - Google Patents

Silencieux pourvue d'une vanne de régulation de gaz d'échappement Download PDF

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Publication number
EP1867844B1
EP1867844B1 EP06380160A EP06380160A EP1867844B1 EP 1867844 B1 EP1867844 B1 EP 1867844B1 EP 06380160 A EP06380160 A EP 06380160A EP 06380160 A EP06380160 A EP 06380160A EP 1867844 B1 EP1867844 B1 EP 1867844B1
Authority
EP
European Patent Office
Prior art keywords
valve
chambers
semi
axial
shutter
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.)
Not-in-force
Application number
EP06380160A
Other languages
German (de)
English (en)
Other versions
EP1867844A1 (fr
Inventor
Alfredo c/o Magneti Marelli España SA. Gonzalez Bosque
Francesc c/o Magneti Marelli España SA. Torres Carpio
Alvaro c/o Magneti Marelli España SA. Serrano Fenollosa
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.)
Marelli Espana SA
Original Assignee
Magneti Marelli Espana SA
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 Magneti Marelli Espana SA filed Critical Magneti Marelli Espana SA
Priority to ES06380160T priority Critical patent/ES2343133T3/es
Priority to EP06380160A priority patent/EP1867844B1/fr
Priority to DE200660012297 priority patent/DE602006012297D1/de
Publication of EP1867844A1 publication Critical patent/EP1867844A1/fr
Application granted granted Critical
Publication of EP1867844B1 publication Critical patent/EP1867844B1/fr
Not-in-force 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
    • F01N1/00—Silencing apparatus characterised by method of silencing
    • F01N1/16—Silencing apparatus characterised by method of silencing by using movable parts
    • F01N1/166—Silencing apparatus characterised by method of silencing by using movable parts for changing the flow path through the silencer or for adjusting the dimensions of a chamber or a pipe

Definitions

  • the present invention relates to an exhaust gas control valve for an exhaust muffler of the semi-active type, i.e. for a muffler in which the exhaust gases output by an internal combustion engine may follow two courses of different length controlled by a valve to optimise either noise abatement, in one case, or engine efficiency, in the other case.
  • the valve controlling the exhaust gas flow is arranged within the muffler along one of the two courses and comprises a valve seat and a shutter, which is movable to open/close the valve seat, and therefore the course to which it is associated.
  • valves arranged completely within the muffler and having a shutter defined by a flap turning about a hinge axis under the opposite bias of the exhaust gas pressure and the elastic bias of a torsion spring.
  • the opening and closing of the valve seat by the turning flap occurs according to the features of the torsion spring (stiffness, pre-load, etc.) and the engine revolutions.
  • This type of valve has a relatively simple structure, and does not have the drawbacks of the solutions illustrated above.
  • EP-A2-1130226 corresponds to the preamble of claim 1 and discloses a cap-like valve body fitted on an end portion of a pipe, that provides a communication between a plurality of silencing chambers formed in a muffler main body.
  • a compressed coil spring is mounted between a flange of the pipe and a flange of the valve body. Communication holes are formed in a cylindrical portion of the valve body.
  • DE10106589C1 discloses a valve comprising a shutter movable for opening/closing a valve seat.
  • the shutter has a stem, axially guided by a sleeve, and a head, which moves to and from the valve seat inside a housing.
  • the housing is provided with radial slits and is defined by the end of a pipe.
  • JP11013451 discloses a flow rate control valve, which adjusts the flow of exhaust gas to an expansion room.
  • the flow rate control valve has a body urged against a stopper by a spring, which is located between such body and a bottom plate provided at the end of the pipe.
  • a semi-active exhaust muffler is made as defined in claim 1.
  • number 1 indicates an exhaust muffler forming part of an exhaust system of an internal combustion engine (not shown) and comprising an external casing 2, of the intrinsically known type and not described in detail, which defines an inlet 3 communicating, in use, with the exhaust of an engine and an outlet 4 communicating, in use, with the external environment.
  • the casing 2 extends along a longitudinal direction 5 and has an internal volume which is divided into a plurality of chambers 6,7,8,9 by partitions 10,11,12, which extend transversally with respect to direction 5 and are fluid-tightly coupled with the internal side surface 13 of the casing 2.
  • Chambers 6,7,8,9 communicate with each other via passages which define two possible courses 15,16 of the exhaust gases flowing from inlet 3 to outlet 4.
  • chamber 7 receives the exhaust gas from inlet 3 and through tube 17 which crosses chamber 6 and the fluid-tight partition 10.
  • Chamber 7 communicates, on one side, with chamber 6 by means of a tube 18 which fluid-tightly crosses partition 10, and on the other side, with chamber 8 through a circular hole 19, made in the partition 11 along direction 5.
  • Chamber 6 in turn, communicates with chamber 8 through a tube 21 which fluid-tightly crosses partition 10, chamber 7 and partition 11, while chamber 8 communicates with outlet 4 by means of a tube 22 which fluid-tightly crosses partition 12.
  • Chamber 9 houses a perforated portion 23 of tube 22 and a soundproofing textile material 24 arranged about portion 23.
  • course 15 comprises tube 17, chamber 7, tube 18, chamber 6, tube 21, chamber 8 and tube 22, to optimise noise abatement; passage 16, instead, comprises tube 17, chamber 7, hole 19, chamber 8 and tube 22, creating a lower counterpressure for gases exhausted by the internal combustion engine, thus optimising the efficiency of the engine itself.
  • the muffler 1 comprises a valve 25, which is completely accommodated within chamber 8.
  • valve 25 comprises a cup-shaped body 26 which defines a guide seat 27, which extends along a straight axis 28 parallel to direction 5 and has an axial inlet 29 for exhaust gases.
  • body 26 comprises a cylindrical side wall 31, which radially delimits seat 27, and a bottom wall 32, which axially delimits seat 27 from the opposite part of the inlet 29.
  • the side wall 31 has two through slots 35, which are diametrically opposite to each other, constitute an exhaust gas outlet from valve 25, and extend from the edge of the body 26.
  • the slots 35 are made between two sectors or edges 36 of the wall 31, which are integrally connected, for example by welding, to a portion 38 of the partition 11, in distanced and coaxial position with respect to the edge of the hole 19.
  • Valve 25 then comprises a shutter 39, which is defined by a piston axially sliding in the seat 27, under the guide of the side wall 31 and under two opposite biases generated by the pressure of the exhaust gases and, respectively, by a spring 40, for opening/closing a valve seat defined by the hole 19.
  • the shutter 39 In the closed position of hole 19 ( figure 1 ), the shutter 39 is adjacent to the inlet 29 and is abuttingly and fluid-tightly arranged against portion 38; when the hole 19 is open ( figure 3 ), the shutter 39 is distanced from the inlet 29 and lets the exhaust gases flow towards the slots 35.
  • the shutter 39 is cup-shaped and comprises: a circular flat wall 41 ( figure 1 ) facing the inlet 29 and orthogonal to axis 28; and a cylindrical wall 42 which faces the bottom wall 32, is axially guided from seat 27, and covers the slots 35 when the shutter 39 is arranged in closed position.
  • Spring 40 instead, is cylindrical helical, accommodated in seat 27, and axially and abuttingly arranged against bottom wall 32, on one side, and against the wall 41, on the other side.
  • the wall 41 of the shutter 39 is subjected to the axial bias generated by the difference of pressure between chambers 7 and 8, on one side, and by the axial bias of spring 40, on the other side.
  • the shutter 39 retracts in seat 27 towards the wall 32 to open the valve 25, i.e. to let the exhaust gas through towards course 16.
  • the pressure threshold and, consequently, the revolution speed of the engine at which the valve 25 opens essentially depends on the pre-load of the spring 40, while the degree of opening of the valve 25 increases with the speed of revolution of the engine according to the elastic constant of the spring 40 itself.
  • the gas pressure in chamber 7 is relatively low, and therefore shutter 39 remains in closed position ( figure 1 ) and the gases follow course 15.
  • the exhaust gas pressure in chamber 7 exceeds the action of the spring 40 and shifts the shutter 39 towards the open position, allowing the gases to follow course 16 and, consequently, bypassing part of the internal passages of the muffler 1 to provide a lower counterpressure to the gases exhausted by the engine.
  • the sectors 36 are integrally connected to the ends 45 of a tube housed in cases 2, in position coaxial to the tube itself.
  • the gas pressure within the tube is relative low, so that the shutter 39 closes the opening defined by end 45.
  • the gas pressure inside the tube exceeds the bias of spring 40 and retracts the shutter 39 towards the open position, letting the gases flow from the end 45 towards the slots 35.
  • valve 25 is small in size and low in cost, since it works according to the exhaust gas pressure let into chamber 7 without needing external actuators, and is extremely versatile, as it may be fitted both to a flat internal partition and to the end 45 of a tube with no variations in tools and/or assembly steps.
  • spring 40 is fitted in an extremely rapid manner, thanks to its position in seat 27, while the structure of shutter 39 and of body 26, reciprocally sliding, is extremely robust, as concerns resistance to fatigue.
  • position, number and conformation of the slots 35 may differ from those indicated by way of example and/or valve 25 may be installed in a muffler different from that described and illustrated.

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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)

Claims (6)

  1. Silencieux d'échappement semi-actif (1) comprenant :
    une entrée (3) ;
    une sortie (4) ;
    un carter externe (2) ayant un volume interne, qui est divisé en une pluralité de chambres (6, 7, 8, 9) par des cloisons (10, 11, 12) ; lesdites chambres communiquant selon un mouvement de va et vient par des passages définissant deux trajectoires différentes (15, 16) pour les gaz d'échappement de ladite entrée (3) à ladite sortie (4) ; et
    une soupape de régulation (25) associée à l'un desdits passages pour modifier le débit des gaz d'échappement s'écoulant par lesdites deux trajectoires (15, 16) ; la soupape de régulation étant complètement logée dans l'une desdites chambres (8) et comprenant :
    a) des moyens élastiques (40),
    b) un siège de soupape (19),
    c) une sortie de soupape pour lesdits gaz d'échappement,
    d) un obturateur mobile (39) pour ouvrir / fermer le siège de soupape (19) ; l'obturateur étant soumis à la sollicitation axiale générée par la différence de pression entre les deux chambres (7, 8), d'un côté et par la sollicitation axiale des moyens élastiques (40) de l'autre côté ;
    caractérisé en ce que ladite soupape de régulation comprend un siège de guidage (27) qui s'étend le long d'un axe droit (28), a une entrée axiale (29) pour lesdits gaz d'échappement, et est défini dans la direction radiale par une paroi latérale (31) ; dans lequel ladite paroi latérale (31) a au moins une fente (35), qui traverse de manière radiale ladite paroi latérale (31), définit ladite sortie de soupape, s'étend de manière axiale à partir d'une partie de paroi annulaire (38 ; 45) définissant ledit siège de soupape (19) et est délimitée dans la direction circonférentielle par un secteur de paroi couplé de manière fixe à ladite partie de paroi annulaire (38 ; 45) ; et dans lequel ledit obturateur (39) coulisse de manière axiale dans ledit siège de guidage (27) sous le guide de ladite paroi latérale (31) et se rétracte dans ledit siège de guidage (27) en commençant par une position fermée, dans laquelle il est adjacent à ladite entrée axiale (29) et ferme ledit siège de soupape (19) pour laisser les gaz d'échappement s'écouler à partir de ladite entrée axiale (29) en passant par ladite fente (35) lorsque la sollicitation générée par ladite différence de pression dépasse une précharge desdits moyens élastiques (40).
  2. Silencieux d'échappement semi-actif selon la revendication 1, caractérisé en ce que ladite paroi latérale (31) comprend une pluralité de fentes (35) qui sont à égale distance et distance réciproque dudit axe (28).
  3. Silencieux d'échappement semi-actif selon l'une quelconque des revendications précédentes, caractérisé en ce que lesdits moyens élastiques (40) sont logés dans ledit siège de guidage (27).
  4. Silencieux d'échappement semi-actif selon la revendication 3, caractérisé en ce que, sur le côté opposé de ladite entrée axiale (29), ledit siège de guidage (27) est délimité de manière axiale par une paroi inférieure (32) ; lesdits moyens élastiques (40) étant agencés en butée contre ladite paroi inférieure (32) et contre ledit obturateur (39).
  5. Silencieux d'échappement semi-actif selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite partie de paroi annulaire (38) fait partie d'une cloison (11) définissant un trou (19) qui met lesdites deux chambres en communication réciproque ; ladite entrée axiale (29) étant coaxiale avec ledit trou (19) ; ledit secteur (36) étant raccordé de manière solidaire à ladite cloison (11).
  6. Silencieux d'échappement semi-actif selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ladite partie de paroi annulaire (45) est l'extrémité axiale d'un tube, qui met lesdites deux chambres en communication réciproque ; ladite entrée axiale (29) étant coaxiale audit tube ; ledit secteur (36) étant raccordé de manière solidaire à ladite extrémité axiale (45).
EP06380160A 2006-06-12 2006-06-12 Silencieux pourvue d'une vanne de régulation de gaz d'échappement Not-in-force EP1867844B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
ES06380160T ES2343133T3 (es) 2006-06-12 2006-06-12 Silenciador provisto con una valvula de control de gases de escape.
EP06380160A EP1867844B1 (fr) 2006-06-12 2006-06-12 Silencieux pourvue d'une vanne de régulation de gaz d'échappement
DE200660012297 DE602006012297D1 (de) 2006-06-12 2006-06-12 Schalldämpfer mit einem Abgasregelventil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06380160A EP1867844B1 (fr) 2006-06-12 2006-06-12 Silencieux pourvue d'une vanne de régulation de gaz d'échappement

Publications (2)

Publication Number Publication Date
EP1867844A1 EP1867844A1 (fr) 2007-12-19
EP1867844B1 true EP1867844B1 (fr) 2010-02-17

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Application Number Title Priority Date Filing Date
EP06380160A Not-in-force EP1867844B1 (fr) 2006-06-12 2006-06-12 Silencieux pourvue d'une vanne de régulation de gaz d'échappement

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EP (1) EP1867844B1 (fr)
DE (1) DE602006012297D1 (fr)
ES (1) ES2343133T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6659234B2 (ja) * 2014-05-30 2020-03-04 株式会社神戸製鋼所 消音器
US10443479B2 (en) 2014-10-30 2019-10-15 Roush Enterprises, Inc. Exhaust control system
WO2017079156A1 (fr) * 2015-11-02 2017-05-11 Roush Enterprises, Inc. Silencieux à voies d'échappement sélectionnées

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1113451A (ja) * 1997-06-25 1999-01-19 Hitachi Constr Mach Co Ltd 可変絞り装置付きマフラ
EP1130226A2 (fr) * 2000-03-01 2001-09-05 Honda Giken Kogyo Kabushiki Kaisha Silencieux d'échappement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE409223C (sv) * 1977-01-21 1980-10-13 Atlas Copco Ab Ventilanordning for dempning av avloppsljudet fran en tryckluftsdriven motor
DE19503322C2 (de) * 1995-02-02 2000-08-24 Gillet Heinrich Gmbh Schalldämpfer mit variabler Dämpfungscharakteristik
DE10106589C1 (de) 2001-02-13 2002-08-01 Gillet Heinrich Gmbh Schalldämpfer mit variabler Dämpfungscharakteristik
DE10311201A1 (de) * 2003-03-14 2004-09-30 Heinrich Gillet Gmbh Schalldämpfer mit variabler Dämpfungscharakteristik

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1113451A (ja) * 1997-06-25 1999-01-19 Hitachi Constr Mach Co Ltd 可変絞り装置付きマフラ
EP1130226A2 (fr) * 2000-03-01 2001-09-05 Honda Giken Kogyo Kabushiki Kaisha Silencieux d'échappement

Also Published As

Publication number Publication date
DE602006012297D1 (de) 2010-04-01
ES2343133T3 (es) 2010-07-23
EP1867844A1 (fr) 2007-12-19

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