EP0991858A1 - Decelerator device mounted in the exhaust gas circuit of a vehicle equipped with a combustion engine - Google Patents

Decelerator device mounted in the exhaust gas circuit of a vehicle equipped with a combustion engine

Info

Publication number
EP0991858A1
EP0991858A1 EP99915822A EP99915822A EP0991858A1 EP 0991858 A1 EP0991858 A1 EP 0991858A1 EP 99915822 A EP99915822 A EP 99915822A EP 99915822 A EP99915822 A EP 99915822A EP 0991858 A1 EP0991858 A1 EP 0991858A1
Authority
EP
European Patent Office
Prior art keywords
shutter
valve
shaft
calibrated
leakage
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
EP99915822A
Other languages
German (de)
French (fr)
Other versions
EP0991858B1 (en
Inventor
Pierre-André WAGNER
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.)
Fowa le Frein Moteur SA
Original Assignee
Fowa le Frein Moteur 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 Fowa le Frein Moteur SA filed Critical Fowa le Frein Moteur SA
Publication of EP0991858A1 publication Critical patent/EP0991858A1/en
Application granted granted Critical
Publication of EP0991858B1 publication Critical patent/EP0991858B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1035—Details of the valve housing
    • F02D9/106—Sealing of the valve shaft in the housing, e.g. details of the bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • F02D9/06—Exhaust brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps

Definitions

  • the present invention relates to a retarder device mounted in the exhaust gas circuit of a vehicle equipped with a combustion engine, comprising at least one valve provided with a body defining a channel and a movable shutter disposed transversely in said channel and coupled to a control shaft, and means for controlling this shutter comprising a device for balancing the back pressure exerted by the shutter on the gases, this balancing device being arranged to come into action when the shutter is in the closed position and from a predetermined back pressure threshold and to open a leakage pipe as soon as the back pressure reaches said threshold and to keep it open beyond said threshold, whatever the engine speed, so as to create an appropriate exhaust gas leakage rate, the balancing device comprising a calibrated valve disposed in said leakage conduit and a compression spring pressure disposed at the rear of said calibrated valve, this spring being calibrated at said threshold value.
  • This type of retarder is well known in particular in the field of industrial vehicles equipped with a combustion engine. Given their high inertia, these vehicles require, in addition to their own braking system, a retarder device housed in the exhaust gas circuit, preferably between the engine and the silencer, and generally mounted at the outlet of the turbocharger. powered by the exhaust manifold. It is usually controlled by a pedal actuated by the driver's left foot to prevent it from disengaging at the same time.
  • This retarder device generates a back pressure in the exhaust circuit. This back pressure is higher or lower depending on the position of the shutter and its degree of opening. It has the effect of slowing down the engine and therefore of completing the braking of the vehicle. The higher the back pressure, the more effective the deceleration.
  • this back pressure must be limited to the maximum set pressure allowable by the exhaust manifold, in order to avoid reopening of the intake valves.
  • This back pressure naturally depends on the pressure of the exhaust gases exerted on the shutter which is an asymptotic function of the engine speed. Consequently, each engine speed corresponds to a back pressure level and therefore a level of deceleration. We are currently trying to make this function constant and at most equal to the maximum admissible set pressure whatever the engine speed and from low speeds, in order to optimize the deceleration.
  • an exhaust modulator device comprises in a shutter flap two leakage holes closed by spring blades having different rigidities.
  • a first leaf spring opens a first leak hole and releases part of the exhaust gases.
  • a second level of back pressure is reached, the second leaf spring opens a second leak hole, thereby increasing the flow of exhaust gases.
  • This device makes it possible to limit the back pressure but generates deceleration stages. H is therefore not optimal.
  • the leaf springs are subjected to temperature constraints and the attack of exhaust gases. As a result, their functioning deteriorates over time, thus affecting their opening and closing performance. In fact, with the heat of the exhaust gases, the leaf springs will lose their stiffness and the holes will always remain open, thus reducing the back pressure and the efficiency of the deceleration.
  • the aim of the present invention is to improve current retarder devices by proposing a simple, compact back pressure equalization device, at a reduced cost, making it possible to obtain constant and maximum deceleration performance whatever engine speed while guaranteeing reliability and operating stability over time without risk of degradation due to aggression from exhaust gases and high temperature.
  • the guide sleeve has at least one peripheral orifice communicating with the part downstream from the leakage duct.
  • the guide sleeve comprises an annular seat arranged to receive said tared valve in abutment, this seat comprising an opening placing said calibrated valve in communication with the channel upstream of the shutter.
  • the annular seat may consist of a circlip disposed in a corresponding groove provided in said guide sleeve, the internal diameter of the circlip being greater than that of the shaft and delimiting said opening.
  • the shutter advantageously includes a cavity disposed opposite the calibrated valve and communicating with the channel upstream of the shutter, when the latter is in the closed position.
  • the calibrated valve comprises a seal disposed around the shutter shaft and the guide sleeve comprises in its axial housing a ring provided with a seal also disposed around the shaft of the shutter, these seals being flat seals made of graphite.
  • the guide sleeve has a bearing face disposed opposite a corresponding face of the shutter to form a first axial stop.
  • the valve also includes a second guide sleeve arranged to guide the other end of said control shaft, this second sleeve having a bearing face disposed opposite a corresponding face of the shutter to form a second axial stop. .
  • the guide bushings have an external thread, are screwed into corresponding housings provided in said body and are treated to offer a low coefficient of friction and to resist high temperatures and oxidation of exhaust gases.
  • FIG. 1 represents an overall perspective view of a retarder device according to the invention mounted at the outlet of a turbocharger
  • FIGS. 2 to 4 are views in axial section showing the retarder device respectively at rest - the shutter open, at work - the shutter closed and in equilibrium - the open leakage duct,
  • FIG. 5 is a perspective view of the shutter
  • Figure 6 is a perspective view of the guide sleeve of the balancing device.
  • the retarder device 1 is conventionally mounted in the exhaust circuit of a generally industrial vehicle and equipped with a combustion engine, at the outlet of a turbocharger TC powered by an EC exhaust manifold which recovers the gases from said engine (not shown).
  • the retarder device 1 comprises a valve 2 controlled by suitable control means (not shown) such as a jack, a motor, etc.
  • the valve 2 comprises a body 4 defining a channel 5 for the passage of the exhaust gases in the direction of the arrows F and a bore 6 for a movable shutter 7 mounted in said body 4 transversely to said channel 5 intended to retain the gases upstream when it is in the closed position.
  • the body 4 has at its ends two mounting flanges 4a, 4b intended to receive, upstream, a corresponding flange of the turbocharger TC and, downstream, a corresponding flange of the exhaust duct (cf. Fig. L).
  • the mounting flanges 4a, 4b can be replaced by any other equivalent device, such as clamps, etc.
  • the movable shutter 7, which is shown, is a butterfly flap mounted on a shaft 8 of axis A, this shaft 8 defining the axis of rotation of said shutter 7.
  • the shaft 8 is guided in rotation in said body 4 by two lower guide sleeves 9 and upper 10.
  • the guide sleeves 9, 10 are screwed into the body 4 in corresponding housings, the assembly by thread ensuring a good seal between the sleeves and said body relative to the exhaust gases likely to infiltrate.
  • These sockets 9, 10 are also axially supported on corresponding faces of the shutter 7 by their corresponding inner faces 9 ', 10' and thereby ensure the positioning and the axial locking of said shutter while avoiding any risk of parasitic vibration.
  • sockets 9, 10 are treated to offer a low coefficient of friction and to resist high temperatures and the oxidation of gases.
  • One of the ends of the shaft 8 crosses said body 4 through the upper guide sleeve 10 to be coupled to the control means directly or by a lever arm 8 '.
  • Any other form of shutter is possible such as a bushel, a ball or a drawer.
  • the retarder device 1 further comprises a balancing device 20 integrated in said body 4 of the valve 2 and arranged to create an exhaust gas leakage flow rate when the shutter 7 is in the closed position to balance the pressures and obtain a maximum and constant backpressure value independent of the engine speed, from a certain predetermined pressure threshold.
  • a balancing device 20 integrated in said body 4 of the valve 2 and arranged to create an exhaust gas leakage flow rate when the shutter 7 is in the closed position to balance the pressures and obtain a maximum and constant backpressure value independent of the engine speed, from a certain predetermined pressure threshold.
  • This stretching device 20 comprises a leakage conduit 21 formed in the body 4 bypassing the shutter 7. It is in fact a vacuum cell already existing in the body 4 and used in the holder's retarders of the present application to guarantee a seal between the control shaft and the body. In the present invention, this vacuum cellar is used as a leakage duct. Consequently, the body 4 does not need to undergo any particular modification other than to provide a housing for the upper sleeve 10.
  • This leakage conduit 21 is therefore disposed substantially perpendicular to the shaft 8, on either side of the upper guide sleeve 10.
  • D has a blind end upstream of the shutter 7 and opens into the channel 5 downstream of said obturator 7.
  • This straightening device 20 also includes a calibrated valve 22 arranged to open or close said leakage conduit 21 from a determined pressure threshold.
  • This calibrated valve 22 is annular, slidably mounted around the shaft 8 and completed by a seal 22 '.
  • This calibrated valve 22 is mounted in an axial housing 23 provided in the upper guide sleeve 10 and through which the shaft 8 passes.
  • the upper guide sleeve 10 has peripheral orifices 24 communicating with said leakage conduit 21.
  • this annular seat 25 may consist of a circlip housed in a corresponding groove provided in said upper bush 10, its internal diameter being greater than that of the shaft 8 and defining said opening 26.
  • a compression spring 27 is p reviewed at the rear of the calibrated valve 22. It is mounted in abutment against a ring 28 provided with a seal 28 'and leaned against the bottom of said axial housing 23.
  • This compression spring 27 is calibrated at a value such that it compresses from a force corresponding to the predetermined backpressure threshold, this pressure being exerted directly by the exhaust gases.
  • the shutter 7 comprises, opposite the upper guide sleeve 10, a cavity 29 formed around the shaft 8 and in communication with the opening 26 provided in the annular seat 25.
  • This cavity 29 has a shape in an arc of a circle and communicating only with the channel 5 upstream of the shutter 7.
  • the seals 22 'and 28' are preferably flat seals in graphite, therefore resistant to high temperatures and to corrosive gases, they seal between the shaft 8 and the valve 22 and the upper bush 10.
  • the retarder device 1 is controlled by the driver of the industrial vehicle by means of a control pedal. In normal vehicle operation, the retarder 1 is at rest, so the shutter 7 is open (see Fig. 2) letting the gases escape freely. During braking, the control means actuated by the user cause the shutter 7 to close (see Fig. 3), thus retaining the gases and generating a back pressure which causes the engine to slow down and therefore reduce the vehicle speed. It should be noted that even in the closed position, there is play between the bore 6 and the shutter 7 to allow a reduced gas flow to escape, thereby avoiding any risk of blockage and dangerous overpressure for the equipment located upstream. From a certain pressure threshold, the equalization device 20 (cf. Fig. 4) is actuated to balance the pressures and regulate the back pressure to a constant value whatever the engine speed.
  • Figure 2 shows the retarder device 1 in its rest position.
  • the shutter 7 is in the open position, that is to say oriented parallel to the flow of exhaust gases.
  • the gas pressure in front of the calibrated valve 22 is substantially zero. Therefore, the stretching device 20 is not in action.
  • Figure 3 shows the retarder device 1 in its working position.
  • the shutter 7 is in the closed position, that is to say oriented perpendicular to the flow of the exhaust gases and generates a back pressure.
  • the shutter 7 and the bore 6 of this shutter are arranged to allow a very small gas leak to escape.
  • the pressure in front of the calibrated valve 22 increases but is still less than the predetermined backpressure threshold defined by the compression spring 27.
  • FIG. 4 shows the retarder device 1 in its equilibrium position.
  • the gas pressure upstream of the shutter 7 has increased beyond the counter threshold. pressure determined by the spring 27 of the calibrated valve 22. Under the effect of this pressure, the calibrated valve 22 is lifted from its seat 25 by compressing the spring 27.
  • the opening 26 then communicates the channel 5 upstream of the shutter 7 by means of its cavity 29 with the leakage conduit 21 by means of the peripheral orifices 24 formed in the upper guide sleeve 10.
  • part of the exhaust gases is deflected in the leakage conduit 21 which discharged it downstream of the shutter 7 creating a varying leakage rate to maintain a substantially constant back pressure.
  • the calibrated valve 22 remains open in an equilibrium position having the effect of regulating the back pressure upstream of the shutter 7.
  • a constant and maximum deceleration is obtained corresponding for example to the maximum set pressure allowed by the CE exhaust manifold regardless of the engine speed.
  • the invention allows the current retarder devices to be controlled by proposing a simple, inexpensive, efficient, compact stretching device 20 incorporated in the valve 2, also ensuring a very good tightness of the retarder.
  • the present invention is not limited to the example of rehsation described but extends to any modification and variant obvious to a person skilled in the art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Exhaust Silencers (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Braking Arrangements (AREA)
  • Transmission Of Braking Force In Braking Systems (AREA)
  • Check Valves (AREA)

Abstract

A decelerator device obtains constant and maximal decelerating power includes by controlling the gas pressure upstream of the valve by balancing the efforts at the pressure-relief valve. The decelerator device (1) includes a balancing device (20) incorporated in the gate (2) body (4) and has a leakage conduit (21) controlled by a calibrated check valve (22). When the valve (7) is closed and, based on a counter-pressure threshold predetermined by the calibration of the compression spring (27) provided at the check valve (22) rear, the latter is lifted from its seat (25) and communicates the channel (5) upstream of the valve (7) with the leakage duct (21) generating an exhaust gas leakage. Beyond the threshold, the calibrated check valve (22) remains open, thereby ensuring constant and maximal counter-pressure whatever the engine speed. The invention is applicable to combustion engine vehicles and in particular industrial vehicles.

Description

DISPOSITIF RALENTISSEUR MONTE DANS LE CIRCUIT D'ÉCHAPPEMENT DES GAZ D'UN VÉHICULE ÉQUIPÉ D'UN MOTEUR À COMBUSTIONSLOWDOWN DEVICE MOUNTED IN THE GAS EXHAUST CIRCUIT OF A VEHICLE EQUIPPED WITH A COMBUSTION ENGINE
La présente invention concerne un dispositif ralentisseur monté dans le circuit d'échappement des gaz d'un véhicule équipé d'un moteur à combustion, comportant au moins une vanne pourvue d'un corps définissant un canal et d'un obturateur mobile disposé transversalement dans ledit canal et couplé à un arbre de commande, et des moyens de commande de cet obturateur comportant un dispositif d'équilibrage de la contre-pression exercée par l'obturateur sur les gaz, ce dispositif d'équilibrage étant agencé pour entrer en action quand l'obturateur est en position fermée et à partir d'un seuil de contre-pression prédéterminé et pour ouvrir un conduit de fuite dès que la contre-pression atteint ledit seuil et pour le garder ouvert au-delà dudit seuil, quel que soit le régime du moteur, de manière à créer un débit de fuite approprié des gaz d'échappement, le dispositif d'équilibrage comportant un clapet taré disposé dans ledit conduit de fuite et un ressort de compression disposé à l'arrière dudit clapet taré, ce ressort étant taré à ladite valeur de seuil.The present invention relates to a retarder device mounted in the exhaust gas circuit of a vehicle equipped with a combustion engine, comprising at least one valve provided with a body defining a channel and a movable shutter disposed transversely in said channel and coupled to a control shaft, and means for controlling this shutter comprising a device for balancing the back pressure exerted by the shutter on the gases, this balancing device being arranged to come into action when the shutter is in the closed position and from a predetermined back pressure threshold and to open a leakage pipe as soon as the back pressure reaches said threshold and to keep it open beyond said threshold, whatever the engine speed, so as to create an appropriate exhaust gas leakage rate, the balancing device comprising a calibrated valve disposed in said leakage conduit and a compression spring pressure disposed at the rear of said calibrated valve, this spring being calibrated at said threshold value.
Ce type de ralentisseur est bien connu notamment dans le domaine des véhicules industriels équipés d'un moteur à combustion. Compte tenu de leur importante inertie, ces véhicules nécessitent, en complément de leur système de freinage propre, un dispositif ralentisseur logé dans le circuit d'échappement des gaz, de préférence entre le moteur et le silencieux, et généralement monté à la sortie du turbocompresseur alimenté par le collecteur d'échappement. Il est habituellement commandé par une pédale actionnée par le pied gauche du conducteur pour éviter qu'il ne débraye en même temps. Ce dispositif ralentisseur permet de générer une contre-pression dans le circuit d'échappement. Cette contre-pression est plus ou moins élevée en fonction de la position de l'obturateur et de son degré d'ouverture. Elle a pour effet de ralentir le moteur et donc de compléter le freinage du véhicule. Plus la contre-pression est élevée et plus le ralentissement est efficace. H faut cependant limiter cette contre- pression à la pression de consigne maximale admissible par le collecteur d'échappement, ceci afin d'éviter la réouverture des soupapes d'admission. Cette contre-pression dépend bien entendu de la pression des gaz d'échappement exercée sur l'obturateur qui est une fonction asymptotique du régime du moteur. Par conséquent, à chaque régime du moteur correspond un niveau de contre-pression et donc un niveau de ralentissement. On cherche actuellement à rendre cette fonction constante et au plus égale à la pression de consigne maximale admissible quel que soit le régime du moteur et dès les faibles régimes, dans le but d'optimiser le ralentissement.This type of retarder is well known in particular in the field of industrial vehicles equipped with a combustion engine. Given their high inertia, these vehicles require, in addition to their own braking system, a retarder device housed in the exhaust gas circuit, preferably between the engine and the silencer, and generally mounted at the outlet of the turbocharger. powered by the exhaust manifold. It is usually controlled by a pedal actuated by the driver's left foot to prevent it from disengaging at the same time. This retarder device generates a back pressure in the exhaust circuit. This back pressure is higher or lower depending on the position of the shutter and its degree of opening. It has the effect of slowing down the engine and therefore of completing the braking of the vehicle. The higher the back pressure, the more effective the deceleration. However, this back pressure must be limited to the maximum set pressure allowable by the exhaust manifold, in order to avoid reopening of the intake valves. This back pressure naturally depends on the pressure of the exhaust gases exerted on the shutter which is an asymptotic function of the engine speed. Consequently, each engine speed corresponds to a back pressure level and therefore a level of deceleration. We are currently trying to make this function constant and at most equal to the maximum admissible set pressure whatever the engine speed and from low speeds, in order to optimize the deceleration.
Une des techniques proposées est décrite dans la publication EP-A-536 284 dans laquelle un dispositif modulateur d'échappement comporte dans un volet d'obturation deux trous de fuite fermés par des lames ressorts ayant des rigidités différentes. Lorsqu'un premier niveau de contre-pression est atteint, une première lame ressort ouvre un premier trou de fuite et libère une partie des gaz d'échappement. Lorsqu'un deuxième niveau de contre-pression est atteint, la deuxième lame ressort ouvre un deuxième trou de fuite augmentant ainsi le débit des gaz d'échappement. Ce dispositif permet de limiter la contre-pression mais génère des paliers de ralentissement. H n'est donc pas optimal. Par ailleurs, les lames ressorts sont soumises aux contraintes de température et à l'agression des gaz d'échappement. De ce fait, leur fonctionnement se dégrade dans le temps, affectant ainsi leur performance à l'ouverture et à la fermeture. En effet, avec la chaleur des gaz d'échappement, les lames ressorts vont perdre leur raideur et les trous resteront toujours ouverts, réduisant ainsi la contre-pression et l'efficacité du ralentissement.One of the techniques proposed is described in publication EP-A-536,284 in which an exhaust modulator device comprises in a shutter flap two leakage holes closed by spring blades having different rigidities. When a first level of back pressure is reached, a first leaf spring opens a first leak hole and releases part of the exhaust gases. When a second level of back pressure is reached, the second leaf spring opens a second leak hole, thereby increasing the flow of exhaust gases. This device makes it possible to limit the back pressure but generates deceleration stages. H is therefore not optimal. In addition, the leaf springs are subjected to temperature constraints and the attack of exhaust gases. As a result, their functioning deteriorates over time, thus affecting their opening and closing performance. In fact, with the heat of the exhaust gases, the leaf springs will lose their stiffness and the holes will always remain open, thus reducing the back pressure and the efficiency of the deceleration.
Une autre technique est décrite dans la publication CH-A-428 318 et prévoit un clapet disposé dans le corps de la vanne papillon à l'opposé de l'arbre de commande de l'obturateur. A cet effet, le corps comporte deux conduits spécifiques formant un circuit by-pass quand le clapet est activé. Cette construction nécessite d'aménager un logement spécifique extérieur au ralentisseur pour recevoir le clapet et d'assurer une étanchéité de ce logement par rapport aux gaz d'échappement. Or le clapet tel qu'il est réalisé ne permet pas de garantir cette étanchéité. De plus, ce logement extérieur crée des problèmes d'encombrement. Un ressort supplémentaire est nécessaire entre le clapet et l'obturateur pour maintenir ce dernier en appui vers le haut contre une butée axiale prévue sur l'arbre de commande et éviter les vibrations dudit obturateur. La configuration de cette butée axiale nécessite de réaliser le corps du ralentisseur en deux parties générant également des problèmes d'étanchéite. De plus aucun dispositif d'étanchéite n'est prévu autour de l'arbre de commande de l'obturateur. Le but de la présente invention est d'améliorer les dispositifs ralentisseurs actuels en proposant un dispositif d'équihbrage de la contre-pression simple, compact, d'un coût réduit, permettant d'obtenir des performances de ralentissement constantes et maximales quel que soit le régime du moteur tout en garantissant une fiabilité et une stabilité de fonctionnement dans le temps sans risque de dégradation due à l'agression des gaz d'échappement et à la haute température.Another technique is described in publication CH-A-428 318 and provides a valve arranged in the body of the butterfly valve opposite the control shaft of the shutter. For this purpose, the body has two specific conduits forming a bypass circuit when the valve is activated. This construction requires fitting a specific housing outside the retarder to receive the valve and ensuring a tightness of this housing with respect to the exhaust gases. However, the valve as it is produced does not guarantee this tightness. In addition, this external housing creates congestion problems. An additional spring is necessary between the valve and the shutter to keep the latter pressing upwards against an axial stop provided on the control shaft and to avoid vibrations of said shutter. The configuration of this axial stop requires making the body of the retarder in two parts also generating sealing problems. In addition, no sealing device is provided around the shutter control shaft. The aim of the present invention is to improve current retarder devices by proposing a simple, compact back pressure equalization device, at a reduced cost, making it possible to obtain constant and maximum deceleration performance whatever engine speed while guaranteeing reliability and operating stability over time without risk of degradation due to aggression from exhaust gases and high temperature.
Ce but est atteint par un dispositif ralentisseur tel que défini en préambule et caractérisé en ce que le dispositif d'équihbrage est intégré dans le corps de la vanne et comporte une douille de guidage traversée par l'arbre et pourvue d'un logement axial destiné à recevoir ledit clapet taré et son ressort coaxialement audit arbre et en ce que le conduit de fuite est disposé sensiblement perpendiculairement à l'arbre et débouche dans le canal en aval dudit obturateur de manière à créer en combinaison avec ledit dispositif d'équihbrage un circuit de dérivation d'une partie du flux des gaz d'échappementThis object is achieved by a retarder device as defined in the preamble and characterized in that the straightening device is integrated in the valve body and comprises a guide bushing traversed by the shaft and provided with an axial housing intended receiving said calibrated valve and its spring coaxially with said shaft and in that the leakage duct is arranged substantially perpendicular to the shaft and opens into the channel downstream of said obturator so as to create in combination with said straightening device a circuit bypassing part of the exhaust gas flow
Dans une forme de réahsation préférée, la douille de guidage comporte au moins un orifice périphérique communiquant avec la partie en aval du conduit de fuite.In a preferred form of connection, the guide sleeve has at least one peripheral orifice communicating with the part downstream from the leakage duct.
De préférence, la douille de guidage comporte un siège annulaire agencé pour recevoir en butée ledit clapet taré, ce siège comportant une ouverture mettant en communication ledit clapet taré et le canal en amont de l'obturateur.Preferably, the guide sleeve comprises an annular seat arranged to receive said tared valve in abutment, this seat comprising an opening placing said calibrated valve in communication with the channel upstream of the shutter.
Le siège annulaire peut être constitué d'un circlips disposé dans une rainure correspondante prévue dans ladite douille de guidage, le diamètre intérieur du circlips étant supérieur à celui de l'arbre et délimitant ladite ouverture.The annular seat may consist of a circlip disposed in a corresponding groove provided in said guide sleeve, the internal diameter of the circlip being greater than that of the shaft and delimiting said opening.
L'obturateur comporte, avantageusement, une cavité disposée en regard du clapet taré et communiquant avec le canal en amont de l'obturateur, quand ce dernier est en position fermée.The shutter advantageously includes a cavity disposed opposite the calibrated valve and communicating with the channel upstream of the shutter, when the latter is in the closed position.
Dans la forme de réahsation préférée, le clapet taré comporte un joint disposé autour de l'arbre de l'obturateur et la douille de guidage comporte dans son logement axial une bague pourvu d'un joint également disposé autour de l'arbre de l'obturateur, ces joints étant des joints plats réalisés en graphite. D'une manière avantageuse, la douille de guidage comporte une face d'appui disposée en regard d'une face correspondante de l'obturateur pour constituer une première butée axiale.In the preferred reahsation form, the calibrated valve comprises a seal disposed around the shutter shaft and the guide sleeve comprises in its axial housing a ring provided with a seal also disposed around the shaft of the shutter, these seals being flat seals made of graphite. Advantageously, the guide sleeve has a bearing face disposed opposite a corresponding face of the shutter to form a first axial stop.
La vanne comporte, également, une deuxième douille de guidage agencée pour guider l'autre extrémité dudit arbre de commande, cette deuxième douille comportant une face d'appui disposée en regard d'une face correspondante de l'obturateur pour constituer une deuxième butée axiale.The valve also includes a second guide sleeve arranged to guide the other end of said control shaft, this second sleeve having a bearing face disposed opposite a corresponding face of the shutter to form a second axial stop. .
De préférence, les douilles de guidage comportent un filetage extérieur, sont vissées dans des logements correspondants prévus dans ledit corps et sont traitées pour offrir un faible coefficient de frottement et résister à des températures élevées et à l'oxydation des gaz d'échappement.Preferably, the guide bushings have an external thread, are screwed into corresponding housings provided in said body and are treated to offer a low coefficient of friction and to resist high temperatures and oxidation of exhaust gases.
La présente invention et ses avantages seront mieux compris dans la description suivante d'une forme de réahsation donnée à titre d'exemple non limitatif et en référence aux dessins annexés, dans lesquels :The present invention and its advantages will be better understood in the following description of a form of rehsation given by way of nonlimiting example and with reference to the appended drawings, in which:
- la figure 1 représente une vue d'ensemble en perspective d'un dispositif ralentisseur selon l'invention monté à la sortie d'un turbocompresseur,FIG. 1 represents an overall perspective view of a retarder device according to the invention mounted at the outlet of a turbocharger,
les figures 2 à 4 sont des vues en coupe axiale montrant le dispositif ralentisseur respectivement au repos - l'obturateur ouvert, au travail - l'obturateur fermé et en équilibre - le conduit de fuite ouvert,FIGS. 2 to 4 are views in axial section showing the retarder device respectively at rest - the shutter open, at work - the shutter closed and in equilibrium - the open leakage duct,
la figure 5 est une vue en perspective de l'obturateur, etFIG. 5 is a perspective view of the shutter, and
la figure 6 est une vue en perspective de la douille de guidage du dispositif d'équilibrage.Figure 6 is a perspective view of the guide sleeve of the balancing device.
En référence à la figure 1, le dispositif ralentisseur 1 selon l'invention est monté de manière classique dans le circuit d'échappement d'un véhicule généralement industriel et équipé d'un moteur à combustion, à la sortie d'un turbocompresseur TC alimenté par un collecteur d'échappement CE qui récupère les gaz dudit moteur (non représenté).Referring to Figure 1, the retarder device 1 according to the invention is conventionally mounted in the exhaust circuit of a generally industrial vehicle and equipped with a combustion engine, at the outlet of a turbocharger TC powered by an EC exhaust manifold which recovers the gases from said engine (not shown).
En référence également aux figures 2 à 4, le dispositif ralentisseur 1 comporte une vanne 2 pilotée par des moyens de commande appropriés (non représentés) tels qu'un vérin, un moteur, etc. La vanne 2 comporte un corps 4 définissant un canal 5 pour le passage des gaz d'échappement dans le sens des flèches F et un alésage 6 pour un obturateur mobile 7 monté dans ledit corps 4 transversalement audit canal 5 destiné à retenir les gaz en amont quand il est en position fermée. Le corps 4 comporte à ses extrémités deux brides de montage 4a, 4b destinées à recevoir, en amont, une bride correspondante du turbocompresseur TC et, en aval, une bride correspondante du conduit d'échappement (cf. Fig. l). Bien entendu, selon le type de ralentisseur, les brides de montage 4a, 4b peuvent être remplacées par tout autre dispositif équivalent, tel que des colliers de serrage, etc.With reference also to FIGS. 2 to 4, the retarder device 1 comprises a valve 2 controlled by suitable control means (not shown) such as a jack, a motor, etc. The valve 2 comprises a body 4 defining a channel 5 for the passage of the exhaust gases in the direction of the arrows F and a bore 6 for a movable shutter 7 mounted in said body 4 transversely to said channel 5 intended to retain the gases upstream when it is in the closed position. The body 4 has at its ends two mounting flanges 4a, 4b intended to receive, upstream, a corresponding flange of the turbocharger TC and, downstream, a corresponding flange of the exhaust duct (cf. Fig. L). Of course, depending on the type of retarder, the mounting flanges 4a, 4b can be replaced by any other equivalent device, such as clamps, etc.
L'obturateur mobile 7, qui est représenté, est un volet papillon monté sur un arbre 8 d'axe A, cet arbre 8 définissant l'axe de rotation dudit obturateur 7. L'arbre 8 est guidé en rotation dans ledit corps 4 par deux douilles de guidage inférieure 9 et supérieure 10. Les douilles de guidage 9, 10 sont vissées dans le corps 4 dans des logements correspondants, l'assemblage par filetage assurant une bonne étanchéité entre les douilles et ledit corps par rapport aux gaz d'échappement susceptibles de s'infiltrer. Ces douilles 9, 10 sont également en appui axial sur des faces correspondantes de l'obturateur 7 par leurs faces intérieures correspondantes 9', 10' et assurent de ce fait le positionnement et le blocage axial dudit obturateur en évitant tout risque de vibration parasite. A cet effet, ces douilles 9, 10 sont traitées pour offrir un faible coefficient de frottement et résister à des températures élevées et à l'oxydation des gaz. L'une des extrémités de l'arbre 8 traverse ledit corps 4 au travers de la douille de guidage supérieure 10 pour être couplée aux moyens de commande directement ou par un bras de levier 8'. Tout autre forme d'obturateur est envisageable tel qu'un boisseau, une bille ou un tiroir.The movable shutter 7, which is shown, is a butterfly flap mounted on a shaft 8 of axis A, this shaft 8 defining the axis of rotation of said shutter 7. The shaft 8 is guided in rotation in said body 4 by two lower guide sleeves 9 and upper 10. The guide sleeves 9, 10 are screwed into the body 4 in corresponding housings, the assembly by thread ensuring a good seal between the sleeves and said body relative to the exhaust gases likely to infiltrate. These sockets 9, 10 are also axially supported on corresponding faces of the shutter 7 by their corresponding inner faces 9 ', 10' and thereby ensure the positioning and the axial locking of said shutter while avoiding any risk of parasitic vibration. To this end, these sockets 9, 10 are treated to offer a low coefficient of friction and to resist high temperatures and the oxidation of gases. One of the ends of the shaft 8 crosses said body 4 through the upper guide sleeve 10 to be coupled to the control means directly or by a lever arm 8 '. Any other form of shutter is possible such as a bushel, a ball or a drawer.
Le dispositif ralentisseur 1 comporte en plus un dispositif d'équihbrage 20 intégré dans ledit corps 4 de la vanne 2 et agencé pour créer un débit de fuite des gaz d'échappement quand l'obturateur 7 est en position fermée pour équilibrer les pressions et obtenir une valeur de contre-pression maximale et constante indépendante du régime moteur, à partir d'un certain seuil de pression prédéterminé.The retarder device 1 further comprises a balancing device 20 integrated in said body 4 of the valve 2 and arranged to create an exhaust gas leakage flow rate when the shutter 7 is in the closed position to balance the pressures and obtain a maximum and constant backpressure value independent of the engine speed, from a certain predetermined pressure threshold.
Ce dispositif d'équihbrage 20 comporte un conduit de fuite 21 ménagé dans le corps 4 court-circuitant l'obturateur 7. Il s'agit en fait d'une cave à dépression déjà existante dans le corps 4 et utilisée dans les ralentisseurs du titulaire de la présente demande pour garantir une étanchéité entre l'arbre de commande et le corps. Dans la présente invention, cette cave à dépression est utilisée comme conduit de fuite. Par conséquent, le corps 4 n'a pas besoin de subir de modification particulière si ce n'est de prévoir un logement pour la douille supérieure 10.This stretching device 20 comprises a leakage conduit 21 formed in the body 4 bypassing the shutter 7. It is in fact a vacuum cell already existing in the body 4 and used in the holder's retarders of the present application to guarantee a seal between the control shaft and the body. In the present invention, this vacuum cellar is used as a leakage duct. Consequently, the body 4 does not need to undergo any particular modification other than to provide a housing for the upper sleeve 10.
Ce conduit de fuite 21 est donc disposé sensiblement perpendiculairement à l'arbre 8, de part et d'autre de la douille de guidage supérieure 10. D possède une extrémité borgne en amont de l'obturateur 7 et débouche dans le canal 5 en aval dudit obturateur 7. Ce dispositif d'équihbrage 20 comporte également un clapet taré 22 agencé pour ouvrir ou fermer ledit conduit de fuite 21 à partir d'un seuil de pression déterminé. Ce clapet taré 22 est annulaire, monté coulissant autour de l'arbre 8 et complété par un joint 22'. Ce clapet taré 22 est monté dans un logement axial 23 prévu dans la douille de guidage supérieure 10 et au travers duquel passe l'arbre 8. La douille de guidage supérieure 10 comporte des orifices périphériques 24 communiquant avec ledit conduit de fuite 21. Elle comporte également à son extrémité située à proximité de l'obturateur 7 un siège annulaire 25 agencé pour recevoir ledit clapet taré 22 et pour laisser une ouverture 26 autour de l'arbre 8 permettant aux gaz de pousser directement sur le clapet taré 22. Comme illustré par la figure 6, ce siège annulaire 25 peut être constitué d'un circlips logé dans une rainure correspondante prévue dans ladite douille supérieure 10, son diamètre intérieur étant supérieur à celui de l'arbre 8 et définissant ladite ouverture 26. Quand le clapet taré 22 est décollé de son siège annulaire 25, cette ouverture 26 met en communication le canal 5 et les orifices périphériques 24. Un ressort de compression 27 est prévu à l'arrière du clapet taré 22. Il est monté en butée contre une bague 28 munie d'un joint 28' et adossée contre le fond dudit logement axial 23. Ce ressort de compression 27 est taré à une valeur telle qu'il se comprime à partir d'une force correspondante au seuil de contre-pression prédéterminé, cette pression étant exercée directement par les gaz d'échappement. Par ailleurs, l'obturateur 7 comporte en regard de la douille de guidage supérieure 10 une cavité 29 ménagée autour de l'arbre 8 et en communication avec l'ouverture 26 prévue dans le siège annulaire 25. Cette cavité 29 présente une forme en arc de cercle et communiquant uniquement avec le canal 5 en amont de l'obturateur 7. Les joints 22' et 28' sont de préférence des joints plats en graphite donc résistants aux hautes températures et aux gaz corrosifs, us assurent l'étanchéité entre l'arbre 8 et le clapet 22 et la douille supérieure 10.This leakage conduit 21 is therefore disposed substantially perpendicular to the shaft 8, on either side of the upper guide sleeve 10. D has a blind end upstream of the shutter 7 and opens into the channel 5 downstream of said obturator 7. This straightening device 20 also includes a calibrated valve 22 arranged to open or close said leakage conduit 21 from a determined pressure threshold. This calibrated valve 22 is annular, slidably mounted around the shaft 8 and completed by a seal 22 '. This calibrated valve 22 is mounted in an axial housing 23 provided in the upper guide sleeve 10 and through which the shaft 8 passes. The upper guide sleeve 10 has peripheral orifices 24 communicating with said leakage conduit 21. It comprises also at its end located near the shutter 7 an annular seat 25 arranged to receive said calibrated valve 22 and to leave an opening 26 around the shaft 8 allowing gases to push directly on the calibrated valve 22. As illustrated by FIG. 6, this annular seat 25 may consist of a circlip housed in a corresponding groove provided in said upper bush 10, its internal diameter being greater than that of the shaft 8 and defining said opening 26. When the calibrated valve 22 is detached from its annular seat 25, this opening 26 connects the channel 5 and the peripheral orifices 24. A compression spring 27 is p reviewed at the rear of the calibrated valve 22. It is mounted in abutment against a ring 28 provided with a seal 28 'and leaned against the bottom of said axial housing 23. This compression spring 27 is calibrated at a value such that it compresses from a force corresponding to the predetermined backpressure threshold, this pressure being exerted directly by the exhaust gases. Furthermore, the shutter 7 comprises, opposite the upper guide sleeve 10, a cavity 29 formed around the shaft 8 and in communication with the opening 26 provided in the annular seat 25. This cavity 29 has a shape in an arc of a circle and communicating only with the channel 5 upstream of the shutter 7. The seals 22 'and 28' are preferably flat seals in graphite, therefore resistant to high temperatures and to corrosive gases, they seal between the shaft 8 and the valve 22 and the upper bush 10.
La commande du dispositif ralentisseur 1 s'effectue par le conducteur du véhicule industriel au moyen d'une pédale de commande. En fonctionnement normal du véhicule, le dispositif ralentisseur 1 est au repos, donc l'obturateur 7 est ouvert (cf. Fig. 2) laissant les gaz s'échapper librement. Lors du freinage, les moyens de commande actionnés par l'utilisateur entraînent la fermeture de l'obturateur 7 (cf. Fig. 3) retenant ainsi les gaz et générant une contre-pression qui provoque le ralentissement du moteur et donc une diminution de la vitesse du véhicule. D faut préciser que même en position fermée, il existe un jeu entre l'alésage 6 et l'obturateur 7 pour laisser échapper un débit de gaz réduit évitant ainsi tout risque de blocage et de surpression dangereuse pour les équipements situés en amont. A partir d'un certain seuil de pression, le dispositif d'équihbrage 20 (cf. Fig. 4) s'actionne pour équilibrer les pressions et réguler la contre-pression à une valeur constante quel que soit le régime du moteur.The retarder device 1 is controlled by the driver of the industrial vehicle by means of a control pedal. In normal vehicle operation, the retarder 1 is at rest, so the shutter 7 is open (see Fig. 2) letting the gases escape freely. During braking, the control means actuated by the user cause the shutter 7 to close (see Fig. 3), thus retaining the gases and generating a back pressure which causes the engine to slow down and therefore reduce the vehicle speed. It should be noted that even in the closed position, there is play between the bore 6 and the shutter 7 to allow a reduced gas flow to escape, thereby avoiding any risk of blockage and dangerous overpressure for the equipment located upstream. From a certain pressure threshold, the equalization device 20 (cf. Fig. 4) is actuated to balance the pressures and regulate the back pressure to a constant value whatever the engine speed.
La figure 2 représente le dispositif ralentisseur 1 dans sa position de repos. L'obturateur 7 est en position ouverte c'est-à-dire orienté parallèlement au flux des gaz d'échappement. La pression des gaz devant le clapet taré 22 est sensiblement nulle. De ce fait, le dispositif d'équihbrage 20 n'est pas en action.Figure 2 shows the retarder device 1 in its rest position. The shutter 7 is in the open position, that is to say oriented parallel to the flow of exhaust gases. The gas pressure in front of the calibrated valve 22 is substantially zero. Therefore, the stretching device 20 is not in action.
La figure 3 représente le dispositif ralentisseur 1 dans sa position de travail. L'obturateur 7 est en position fermée c'est-à-dire orienté perpendiculairement au flux des gaz d'échappement et génère une contre-pression. Comme expliqué plus haut, l'obturateur 7 et l'alésage 6 de cet obturateur sont agencés pour laisser s'échapper une fuite de gaz très réduite. Dans cette figure, la pression devant le clapet taré 22 augmente mais est encore inférieure au seuil de contre-pression prédéterminé et défini par le ressort de compression 27.Figure 3 shows the retarder device 1 in its working position. The shutter 7 is in the closed position, that is to say oriented perpendicular to the flow of the exhaust gases and generates a back pressure. As explained above, the shutter 7 and the bore 6 of this shutter are arranged to allow a very small gas leak to escape. In this figure, the pressure in front of the calibrated valve 22 increases but is still less than the predetermined backpressure threshold defined by the compression spring 27.
La figure 4 représente le dispositif ralentisseur 1 dans sa position d'équilibre. La pression des gaz en amont de l'obturateur 7 s'est accrue au-delà du seuil de contre- pression déterminé par le ressort 27 du clapet taré 22. Sous l'effet de cette pression, le clapet taré 22 se soulève de son siège 25 en comprimant le ressort 27. L'ouverture 26 met alors en communication le canal 5 en amont de l'obturateur 7 par l'intermédiaire de sa cavité 29 avec le conduit de fuite 21 par l'intermédiaire des orifices périphériques 24 ménagés dans la douille de guidage supérieure 10. Ainsi, une partie des gaz d'échappement est déviée dans le conduit de fuite 21 qui l'évacué en aval de l'obturateur 7 créant un débit de fuite variant pour maintenir une contre-pression sensiblement constante. Dans cette configuration du dispositif ralentisseur 1, le clapet taré 22 reste ouvert dans une position d'équilibre ayant pour effet de réguler la contre- pression en amont de l'obturateur 7. Ainsi, on obtient un ralentissement constant et maximal correspondant par exemple à la pression de consigne maximale admissible par le collecteur d'échappement CE quel que soit le régime du moteur.Figure 4 shows the retarder device 1 in its equilibrium position. The gas pressure upstream of the shutter 7 has increased beyond the counter threshold. pressure determined by the spring 27 of the calibrated valve 22. Under the effect of this pressure, the calibrated valve 22 is lifted from its seat 25 by compressing the spring 27. The opening 26 then communicates the channel 5 upstream of the shutter 7 by means of its cavity 29 with the leakage conduit 21 by means of the peripheral orifices 24 formed in the upper guide sleeve 10. Thus, part of the exhaust gases is deflected in the leakage conduit 21 which discharged it downstream of the shutter 7 creating a varying leakage rate to maintain a substantially constant back pressure. In this configuration of the retarder device 1, the calibrated valve 22 remains open in an equilibrium position having the effect of regulating the back pressure upstream of the shutter 7. Thus, a constant and maximum deceleration is obtained corresponding for example to the maximum set pressure allowed by the CE exhaust manifold regardless of the engine speed.
Il ressort clairement de cette description que l'invention permet d'amehorer les dispositifs ralentisseurs actuels en proposant un dispositif d'équihbrage 20 simple, peu coûteux, efficace, compact et incorporé à la vanne 2, assurant également une très bonne étanchéité du ralentisseur.It is clear from this description that the invention allows the current retarder devices to be controlled by proposing a simple, inexpensive, efficient, compact stretching device 20 incorporated in the valve 2, also ensuring a very good tightness of the retarder.
La présente invention n'est pas limitée à l'exemple de réahsation décrit mais s'étend à toute modification et variante évidente pour un homme du métier. The present invention is not limited to the example of rehsation described but extends to any modification and variant obvious to a person skilled in the art.

Claims

Revendications claims
1. Dispositif ralentisseur (1) monté dans le circuit d'échappement des gaz d'un véhicule équipé d'un moteur à combustion, comportant au moins une vanne (2) pourvue d'un corps (4) définissant un canal (5) et d'un obturateur mobile (7) disposé transversalement dans ledit canal (5) et couplé à un arbre de commande (8), et des moyens de commande de cet obturateur comportant un dispositif d'équihbrage (20) de la contre-pression exercée par l'obturateur sur les gaz, ce dispositif d'équihbrage étant agencé pour entrer en action quand l'obturateur (7) est en position fermée et à partir d'un seuil de contre-pression prédéterminé et pour ouvrir un conduit de fuite (21) dès que la contre-pression atteint ledit seuil et pour le garder ouvert au-delà dudit seuil, quel que soit le régime du moteur, de manière à créer un débit de fuite approprié des gaz d'échappement, le dispositif d'équihbrage (20) comportant un clapet taré (22) disposé dans ledit conduit de fuite (21) et un ressort de compression (27) disposé à l'arrière dudit clapet taré (22), ce ressort étant taré à ladite valeur de seuil, caractérisé en ce que le dispositif d'équihbrage (20) est intégré dans le corps (4) de la vanne (2) et comporte une douille de guidage (10) traversée par l'arbre (8) et pourvue d'un logement axial (23) destiné à recevoir ledit clapet taré (22) et son ressort (27) coaxialement audit arbre (8) et en ce que le conduit de fuite (21) est disposé sensiblement perpendiculairement à l'arbre (8) et débouche dans le canal (5) en aval dudit obturateur de manière à créer en combinaison avec ledit dispositif d'équihbrage (20) un circuit de dérivation d'une partie du flux des gaz d'échappement1. retarder device (1) mounted in the exhaust gas circuit of a vehicle equipped with a combustion engine, comprising at least one valve (2) provided with a body (4) defining a channel (5) and a movable shutter (7) disposed transversely in said channel (5) and coupled to a control shaft (8), and means for controlling this shutter comprising a device for equalizing (20) the back pressure exerted by the shutter on the gases, this balancing device being arranged to come into action when the shutter (7) is in the closed position and from a predetermined backpressure threshold and to open a leakage duct (21) as soon as the back pressure reaches said threshold and to keep it open beyond said threshold, regardless of the engine speed, so as to create an appropriate exhaust gas leakage rate, the balance (20) comprising a calibrated valve (22) disposed in said leakage duct (21 ) and a compression spring (27) disposed at the rear of said calibrated valve (22), this spring being calibrated at said threshold value, characterized in that the straightening device (20) is integrated in the body (4 ) of the valve (2) and comprises a guide sleeve (10) traversed by the shaft (8) and provided with an axial housing (23) intended to receive said calibrated valve (22) and its spring (27) coaxially to said shaft (8) and in that the leakage conduit (21) is arranged substantially perpendicular to the shaft (8) and opens into the channel (5) downstream of said shutter so as to create in combination with said device balance (20) a bypass circuit for part of the exhaust gas flow
2. Dispositif selon la revendication 1, caractérisé en ce que la douille de guidage (10) comporte au moins un orifice périphérique (24) communiquant avec la partie en aval du conduit de fuite (21).2. Device according to claim 1, characterized in that the guide sleeve (10) comprises at least one peripheral orifice (24) communicating with the part downstream of the leakage conduit (21).
3. Dispositif selon la revendication 1, caractérisé en ce que la douille de guidage (10) comporte un siège annulaire (25) agencé pour recevoir en butée ledit clapet taré (22), ce siège comportant une ouverture (26) mettant en communication ledit clapet taré (22) et le canal (5) en amont de l'obturateur (7).3. Device according to claim 1, characterized in that the guide sleeve (10) comprises an annular seat (25) arranged to receive in abutment said calibrated valve (22), this seat comprising an opening (26) putting said communication into communication calibrated valve (22) and the channel (5) upstream of the shutter (7).
4. Dispositif selon la revendication 3, caractérisé en ce que le siège annulaire (25) est constitué d'un circlips disposé dans une rainure correspondante prévue dans ladite 104. Device according to claim 3, characterized in that the annular seat (25) consists of a circlip arranged in a corresponding groove provided in said 10
douille de guidage (10), le diamètre intérieur du circlips étant supérieur à celui de l'arbre (8) et délimitant ladite ouverture (26).guide sleeve (10), the internal diameter of the circlip being greater than that of the shaft (8) and delimiting said opening (26).
5. Dispositif selon la revendication 1, caractérisé en ce que l'obturateur (7) comporte une cavité (29) disposée en regard du clapet taré (22) et communiquant avec le canal5. Device according to claim 1, characterized in that the shutter (7) comprises a cavity (29) disposed opposite the calibrated valve (22) and communicating with the channel
(5) en amont de l'obturateur (7), quand ce dernier est en position fermée.(5) upstream of the shutter (7), when the latter is in the closed position.
6. Dispositif selon la revendication 1, caractérisé en ce que le clapet taré (22) comporte un joint (22') disposé autour de l'arbre (8) de l'obturateur (7).6. Device according to claim 1, characterized in that the calibrated valve (22) comprises a seal (22 ') disposed around the shaft (8) of the shutter (7).
7. Dispositif selon la revendication 1, caractérisé en ce que la douille de guidage (10) comporte dans son logement axial (23) une bague (28) pourvu d'un joint (28') disposé autour de l'arbre (8) de l'obturateur (7).7. Device according to claim 1, characterized in that the guide sleeve (10) comprises in its axial housing (23) a ring (28) provided with a seal (28 ') disposed around the shaft (8) the shutter (7).
8. Dispositif selon la revendication 6 ou 7, caractérisé en ce que les joints (22', 28') sont des joints plats réalisés en graphite.8. Device according to claim 6 or 7, characterized in that the seals (22 ', 28') are flat seals made of graphite.
9. Dispositif selon la revendication 1, caractérisé en ce que la douille de guidage (10) comporte une face d'appui (10') disposée en regard d'une face correspondante de l'obturateur (7) pour constituer une première butée axiale.9. Device according to claim 1, characterized in that the guide sleeve (10) has a bearing face (10 ') disposed opposite a corresponding face of the shutter (7) to constitute a first axial stop .
10. Dispositif selon la revendication 9, caractérisé en ce que la vanne (2) comporte une deuxième douille de guidage (9) agencée pour guider l'autre extrémité dudit arbre (8) de commande, cette deuxième douille comportant une face d'appui (9') disposée en regard d'une face correspondante de l'obturateur (7) pour constituer une deuxième butée axiale.10. Device according to claim 9, characterized in that the valve (2) comprises a second guide bush (9) arranged to guide the other end of said control shaft (8), this second bush having a bearing face (9 ') disposed opposite a corresponding face of the shutter (7) to form a second axial stop.
11. Dispositif selon les revendications 9 et 10, caractérisé en ce que les douilles de guidage (9, 10) comportent un filetage extérieur et sont vissées dans des logements correspondants prévus dans ledit corps (4).11. Device according to claims 9 and 10, characterized in that the guide bushings (9, 10) have an external thread and are screwed into corresponding housings provided in said body (4).
12. Dispositif selon la revendication 11, caractérisé en ce que les douilles de guidage (9, 10) sont traitées pour offrir un faible coefficient de frottement et résister à de températures élevées et à l'oxydation des gaz d'échappement. 12. Device according to claim 11, characterized in that the guide bushings (9, 10) are treated to offer a low coefficient of friction and resist high temperatures and oxidation of exhaust gases.
EP99915822A 1998-04-22 1999-04-22 Decelerator device mounted in the exhaust gas circuit of a vehicle equipped with a combustion engine Expired - Lifetime EP0991858B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9805211 1998-04-22
FR9805211A FR2777946B1 (en) 1998-04-22 1998-04-22 SLOWDOWN DEVICE MOUNTED IN THE GAS EXHAUST CIRCUIT OF A VEHICLE EQUIPPED WITH A COMBUSTION ENGINE
PCT/FR1999/000966 WO1999054612A1 (en) 1998-04-22 1999-04-22 Decelerator device mounted in the exhaust gas circuit of a vehicle equipped with a combustion engine

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EP0991858A1 true EP0991858A1 (en) 2000-04-12
EP0991858B1 EP0991858B1 (en) 2002-08-07

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AT (1) ATE221956T1 (en)
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CA (1) CA2294093A1 (en)
DE (1) DE69902429T2 (en)
FR (1) FR2777946B1 (en)
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DE69902429D1 (en) 2002-09-12
FR2777946B1 (en) 2000-06-16
FR2777946A1 (en) 1999-10-29
WO1999054612A1 (en) 1999-10-28
ATE221956T1 (en) 2002-08-15
TR199903201T1 (en) 2000-07-21
AU3426699A (en) 1999-11-08
RU2218469C2 (en) 2003-12-10
EP0991858B1 (en) 2002-08-07
DE69902429T2 (en) 2003-05-08
KR20010020489A (en) 2001-03-15
CA2294093A1 (en) 1999-10-28
US6273058B1 (en) 2001-08-14

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