EP1311754A1 - Dispositif soupape a double clapet et pont thermique destines a un systeme de recyclage des gaz d'echappement et procede d'utilisation - Google Patents

Dispositif soupape a double clapet et pont thermique destines a un systeme de recyclage des gaz d'echappement et procede d'utilisation

Info

Publication number
EP1311754A1
EP1311754A1 EP01974209A EP01974209A EP1311754A1 EP 1311754 A1 EP1311754 A1 EP 1311754A1 EP 01974209 A EP01974209 A EP 01974209A EP 01974209 A EP01974209 A EP 01974209A EP 1311754 A1 EP1311754 A1 EP 1311754A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
gas recirculation
valve
valve arrangement
bearing housing
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
EP01974209A
Other languages
German (de)
English (en)
Other versions
EP1311754B1 (fr
Inventor
Stefan Goedtner
Marc Rother
Thomas Breit
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Publication of EP1311754A1 publication Critical patent/EP1311754A1/fr
Application granted granted Critical
Publication of EP1311754B1 publication Critical patent/EP1311754B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/38—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with two or more EGR valves disposed in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F02M26/26—Layout, e.g. schematics with coolers having bypasses characterised by details of the bypass valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/70—Flap valves; Rotary valves; Sliding valves; Resilient valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/71—Multi-way valves

Definitions

  • the invention relates to a valve assembly for an exhaust gas recirculation system of a nerbrennmaschine with a flange for flange mounting on a heat sink with a defined temperature range, in particular a water-cooled engine block of the combustion engine according to the preamble of claim 1 or 19, and a method for operating such valve arrangements.
  • Such a double flap is described for example in JP 07-198045.
  • Valve flaps are connected by a common shaft and are driven by a motor.
  • the valve flaps are arranged at right angles to each other so that only one of the two exhaust pipes is closed.
  • an exhaust gas flap system for a multi-flow exhaust system is also known.
  • One exhaust gas flap is provided in each of the two exhaust gas lines, the two exhaust gas flaps having a common pivot axis and the two exhaust gas flaps being arranged rotated by 90 ° relative to one another.
  • the two exhaust lines are thus alternately closed or released by the exhaust flaps.
  • the exhaust flaps described there are mounted on journals by means of positive plug connections.
  • the bearing journals are each pressed completely against the force of a spring into the respective bearing sleeves, cylindrical transverse channels having to be provided between adjacent exhaust lines, in each of which a driver is rotatably mounted.
  • the driver On one side, the driver has a recess designed as a bearing sleeve, into which the bearing journal of the first exhaust flap can be inserted in order to produce a driving connection.
  • the other end of the driver is designed as a journal, which can also be inserted into a recess of the second exhaust flap for establishing a driving connection.
  • This exhaust gas flap system requires a high manufacturing effort due to the form-fitting plug connections, which means that the production of such an exhaust flap system is very expensive.
  • the object of the invention is to provide a valve arrangement for an exhaust gas recirculation system of an internal combustion engine, which is inexpensive to manufacture and has a long service life. Furthermore, a method for operating such a valve arrangement is to be specified.
  • the valve arrangement according to the invention for an exhaust gas recirculation system of an internal combustion engine in particular an internal combustion engine for diesel fuel of a passenger car, has a flange for flange mounting on a heat sink with a defined temperature range.
  • the heat sink is preferably a water-cooled engine block of the internal combustion engine.
  • the exhaust gas recirculation system is designed with a first and a second exhaust gas return line, in each of which a first and a second valve flap is arranged.
  • the valve flaps are rotatably arranged with a common shaft in a bearing device with a bearing housing such that at least one of the exhaust gas recirculation lines can be closed.
  • the invention is characterized in that the bearing housing is connected to the flange via a structural thermal bridge in such a way that the bearing housing has a maximum temperature of less than 400 ° C., in particular less than 300 ° C., during operation of the combustion machine.
  • the bearing housing preferably has a maximum temperature of 250 ° C. especially in the event that the bearing housing consists essentially of an aluminum material.
  • the valve arrangement according to the invention has a common shaft on which both valve flaps are arranged. In this way, the manufacture of such a valve arrangement is very inexpensive.
  • the shaft thus extends through both exhaust gas recirculation lines, as a result of which it is always exposed to a high temperature during operation, because the exhaust gas flowing past or in front of it has a temperature of approximately 800 ° C. to 1000 ° C.
  • the absorbed thermal energy is passed on to the bearing device via the shaft. If there is insufficient heat dissipation from the bearing housing into adjacent components and / or the environment, stresses could arise due to a different thermal expansion behavior of the bearing components, which could impair the functionality of the bearing device.
  • the bearing housing is connected to the flange via a structural thermal bridge in such a way that the bearing housing never exceeds a temperature of 400 ° C., in particular 300 ° C., at any time during operation of the internal combustion engine.
  • a thermal bridge preferably has a high thermal conductivity in order to quickly dissipate the heat introduced via the shaft via the housing. If the flange is connected to a heat sink which has a defined temperature range, the temperature difference between the heat sink and the bearing device causes a heat flow to the heat sink. This effect is all the more effective the greater the temperature difference between the heat sink and the bearing device.
  • the thermal bridge in such a way that the ratio of the thickness of the thermal bridge to the shortest length is at least 0.1.
  • the ratio is preferably at least 0.3, in particular at least 0.5.
  • the shortest length describes the shortest distance between the flange and the bearing housing.
  • the thermal bridge has an average thickness perpendicular to this length.
  • the average thickness is an average of the actual thicknesses of the thermal bridge over the shortest length.
  • This ratio of thickness to length ensures a thermal bridge which has a cross section suitable for the heat transport. This also ensures that the thermal bridge has sufficient thermal capacity. According to this ratio, it is particularly advantageous to arrange the valve arrangement according to the invention close to the heat sink, the thermal bridge being made relatively thick-walled.
  • the flange essentially has a temperature like the heat sink during operation of the internal combustion engine.
  • the heat sink is in particular a water-cooled engine block on the internal combustion engine. This ensures that the temperature difference between the bearing housing and the heat sink essentially corresponds to the temperature difference between the bearing housing and the flange.
  • the connection between the flange and the heat sink is therefore particularly well heat-conducting. Metallic connecting elements and / or seals with metallic components are particularly suitable for this.
  • the thermal bridge and / or the bearing housing has cooling fins.
  • Such cooling fins enlarge the Surface of the thermal bridge and / or the bearing housing, whereby the heat radiation from the thermal bridge or the bearing housing is positively influenced.
  • the cooling fins on the thermal bridge enlarge the cross-section, which additionally improves the heat transport over the thermal bridge.
  • the bearing device is designed with a bushing which is formed from a material with high thermal conductivity, preferably with a bushing made of bronze.
  • a bushing which is formed from a material with high thermal conductivity, preferably with a bushing made of bronze.
  • the bushing should be designed with a large axial length if possible, which increases the contact area with the bearing housing and at the same time improves the heat flow. In this way, thermal stresses in the bearing device are significantly reduced. This results in essentially wear-free storage, the service life of the valve arrangement being increased.
  • a graphite lubrication of this type ensures that the valve flaps can be easily supported without significant friction loss over a wide temperature range.
  • the first and the second valve flap have a common pivot axis through the shaft and are essentially arranged in a first and a second valve flap plane.
  • the valve flap planes enclose an angle, the included angle preferably being 90 °.
  • the angle enclosed between the first and second valve flap level ensures that a different opening cross section can be set in each of the two exhaust gas recirculation lines, through which the desired amount of exhaust gas flows.
  • An angle of 90 ° has the advantage that the valve flaps can be adjusted with a common shaft in such a way that an exhaust gas recirculation is closed, while the valve flap in the other exhaust gas recirculation does not represent a significant impediment to the exhaust gas flowing through.
  • the valve flaps each have a bulge, these bulges at least partially enclosing the shaft and the valve flaps being connected to the shaft in terms of joining technology.
  • the bulges provide, in particular, a contact surface for the shaft, as a result of which the valve flaps can be aligned on the shaft.
  • the bulges ensure a suitable fixation of the valve flaps on the shaft during the formation of the technical connection. It is particularly advantageous to weld the valve flaps to the shaft *.
  • the welded connection ensures a permanent connection between the valve flaps and the shaft, even at high temperatures.
  • the first exhaust gas recirculation line has an exhaust gas cooler.
  • the exhaust gas cooler reduces the temperature of the recirculated exhaust gas, which also brings about a reduction in the temperature in the air / fuel mixture. The consequence of this is that a lower combustion temperature is generated during the combustion of the air / fuel mixture, as a result of which the nitrogen oxide content in the exhaust gas generated is further reduced.
  • the thermal bridge is arranged near the first exhaust gas recirculation line.
  • the first exhaust gas recirculation line with the exhaust gas cooler is used in particular when the internal combustion engine is in an operating state in which very hot exhaust gases are already being generated. Sufficient cooling of the bearing device is required, particularly in this operating phase, in particular in the area of the bearing device via which the shaft is driven. This is ensured by a thermal bridge near the first exhaust gas recirculation line, because of this the heat that is absorbed by the shaft and the exhaust gas; can be dissipated quickly and effectively. This also contributes to increasing the service life due to reduced thermal stresses in the bearing device.
  • the shaft is connected to a drive '. It is particularly advantageous if the drive is in turn connected to a control and / or regulating unit. Due to the very complex relationships between the recirculated exhaust gas and the processes in the combustion chamber, the exhaust gas recirculation system must be operated depending on the operating state of the internal combustion engine. Such a drive with a corresponding control or regulating unit ensures a quantitative and temporally exact admixture of the exhaust gas to the air-fuel mixture.
  • the shaft has a groove and the bearing device has at least one bushing, a disc being arranged in the groove, so that the bushing lies against the disc.
  • the disk has an opening through which the shaft extends. It is especially slotted to be easily installed in the groove.
  • the disc lies against a contact surface of the bearing housing and thus fixes the bush axially to the shaft.
  • Means for sealing so that, for example, no exhaust gas from the exhaust gas recirculation line through the bore, which is used to receive the shaft, or lubricant or the like reaches the outside into the environment.
  • the production of a type of labyrinth seal is preferred, graphite foil being arranged in the bearing housing between the bearing device and a sleeve. This is deformed, for example, into a ring which is arranged around the shaft and further deformed by means of the bearing device and the sleeve.
  • This type of seal is suitable, independently of or in combination with the valve arrangements claimed here with a double flap and a thermal bridge, for sealing through bores which are provided in the housing and which contains exhaust gas, the latter in particular having a very low oxygen content.
  • graphite seals can only be used up to a temperature of approx. 450 ° C, since they react with oxygen at higher temperatures and lose their sealing properties.
  • tests with regard to the suitability of such graphite seals for exhaust gases, such as those produced by mobile internal combustion engines, have surprisingly shown that these graphite seals withstand temperatures of up to approximately 1300 ° C.
  • a temperature suitability of up to approximately 700 ° C or 900 ° C is required.
  • An important factor in this context is the composition of the exhaust gas, which generates a kind of inert gas atmosphere in the area of the seal. Becomes even prevents the oxygen in the ambient air to 'reach the sealing point, such as for example with a pressed-in bore sleeve, as a durable, cost-effective and temperature resistant seal is made.
  • the valve arrangement for an exhaust gas recirculation system of an internal combustion engine has a flange for flange-mounting on the internal combustion engine and a first and a second exhaust gas recirculation line, each with a first and a second valve flap.
  • the valve flaps are rotatably arranged on a common shaft in a bearing device with a bearing housing such that at least one of the exhaust gas recirculation lines can be closed.
  • the first and / or the second exhaust gas recirculation line an exhaust gas cooler, the exhaust gas cooler being a heat sink with a defined temperature range, the bearing housing being connected to the exhaust gas cooler via at least one connecting part such that the bearing housing has a maximum temperature of less than 400 ° C., preferably less than 300 ° C., during operation of the internal combustion engine , In particular in the case of a bearing housing made of an aluminum material, the maximum temperature can also be limited to less than 250 ° C.
  • the at least one connection part like the thermal bridge, has one for rapid and intensive heat removal from the bearing housing
  • Exhaust gas cooler preferably has a water circuit
  • Exhaust gas temperature in particular between 80 ° C and 100 ° C. In this way there is a clear temperature difference, which one
  • the bearing housing it is very particularly advantageous to additionally combine the bearing housing with a thermal bridge to the flange for flange-mounting on a further heat sink, in particular a water-cooled engine block of an internal combustion engine.
  • the valve arrangement thus has a common shaft for both valve flaps, it being very inexpensive to produce, and likewise ensures a high one
  • the at least one connecting part and / or the bearing housing has at least one channel through which a cooling medium can be introduced.
  • the cooling medium can be removed directly from the exhaust gas cooler, or it is, for example, an external cooling medium, such as air (in particular the intake air of an internal combustion engine), which may be cooled by means of the exhaust gas cooler before being introduced into the at least one connecting part has been.
  • the channels are particularly inexpensive to manufacture if they are designed as through holes. The openings that are not required can be sealed, for example, by simply designed closure pieces.
  • the at least one connection part can be designed as an integral part of the bearing housing or can be attached to a channel as an additional component.
  • connection part designed as a separate component is designed in such a way that a suitable heat flow takes place over the connection area.
  • This last embodiment has the advantage that the introduction of the cooling medium into the bearing housing is made variable.
  • the connecting part can thus be arranged such that the shortest distance to the heat sink or to the exhaust gas cooler is achieved.
  • the method according to the invention for operating the valve arrangement for an exhaust gas recirculation system of an internal combustion engine in which the first valve flap closes the first exhaust gas recirculation line, while the second valve flap is arranged in the second exhaust gas recirculation line so that an exhaust gas flows through it, is characterized in that the exhaust gas recirculation lines can be alternately closed or opened depending on the operating state of the internal combustion engine. In this way, the corresponding amount of the exhaust gas which is to be mixed into the air / fuel mixture flows through only one of the two exhaust gas recirculation lines.
  • the first and / or the second exhaust gas recirculation line can be designed such that the exhaust gas after flowing through the exhaust gas recirculation line has the desired properties (e.g.
  • the second exhaust gas recirculation line is a secondary exhaust gas recirculation line which is only opened during a cold start phase of the internal combustion engine and through which the exhaust gas flows.
  • the first exhaust gas recirculation line is a main exhaust gas recirculation line which has an exhaust gas cooler and is closed during the cold start phase. The exhaust gas has a lower temperature during the cold start phase of the internal combustion engine.
  • the main exhaust gas recirculation line has an exhaust gas cooler, with the aid of which the exhaust gas is cooled to a predeterminable temperature after the cold start phase and is then mixed into the air / fuel mixture in this cooled state.
  • FIG. 1 is a schematic representation of an internal combustion engine with an exhaust gas recirculation system
  • FIG. 3 shows a schematic view of a valve arrangement according to the invention on a water-cooled engine block
  • FIG. 4 shows a schematic partial view of a further valve arrangement according to the invention with a connecting part
  • Fig. 5 is a schematic sectional view of the bearing housing in Figure 4.
  • Fig. 6 is a schematic detailed view of a particularly preferred embodiment of a bearing housing with a seal.
  • FIG. 1 schematically shows the structure of an internal combustion engine 3 with four combustion chambers 26.
  • the internal combustion engine 3 is supplied with air via the intake air line 5, which is then mixed with the fuel.
  • the actual combustion takes place in the combustion chambers 26, the exhaust gas generated subsequently being cleaned in the exhaust line 27 and finally being released into the environment.
  • the exhaust gas recirculation system connects the exhaust line 27 and the intake air line 5, the exhaust gas flowing at least partially through the valve arrangement 1.
  • the valve arrangement 1 is connected to a drive 17 which is activated via a control unit 18.
  • a first 4a and a second exhaust gas recirculation line 4b are connected downstream 7 of the valve arrangement 1.
  • the first exhaust gas recirculation line 4a has an exhaust gas cooler 6.
  • the exhaust gas cooler 6 ensures that the exhaust gas flowing through it has a temperature downstream 7 that is so cool that when the air-fuel mixture is burned, there is only a small nitrogen oxide emission.
  • FIG. 2 schematically shows a top view of the shaft 22 with the first valve flap 8a and the second valve flap 8b. Both valve flaps 8a and 8b have a common pivot axis 15 through the shaft 22.
  • the first valve flap 8a is arranged in a first valve flap level 1 a.
  • the second valve flap 8b is arranged in the second valve flap level 19b.
  • the valve flap levels 19a and 19b enclose an angle 20. In the illustrated embodiment, the valve flap levels 19a and 19b enclose an angle of 90 °.
  • the valve flaps 8a and 8b are welded 24 to the shaft 22.
  • FIG. 3 shows a particularly preferred embodiment of the valve arrangement 1 according to the invention.
  • the valve arrangement 1 has a flange 2 with which it is flanged to a water-cooled engine block 11.
  • the valve arrangement 1 also has a first 4a and a second exhaust gas recirculation line 4b, each with a first 8a and a second valve flap 8b, the
  • Valve flaps 8a and 8b are rotatably arranged with a common shaft 22 in a bearing device 9 with a bearing housing 12 such that at least one of the exhaust gas recirculation lines 4a and 4b is closed.
  • the first 8a and the second valve flap 8b each have a first bulge 16a and a second bulge 16b, which at least partially enclose the common shaft 22.
  • the valve flaps 8a and 8b are welded to the shaft 22.
  • the first valve flap 8a is opposite the second
  • Valve flap 8b arranged offset by 90 °, the valve flaps 8a and 8b having a common pivot axis 15, so that at least one of the
  • Exhaust gas recirculation lines 4a and 4b are closed.
  • the shaft 22 is guided in particular with a bearing device 9.
  • the bearing device 9 is arranged in a bearing housing 12 and has one Bushing 13 made of bronze and a graphite lubrication 14.
  • the bronze bushing 13 ensures rapid removal of the heat introduced into the bearing device 9 by the shaft 22 into the bearing housing 12.
  • the graphite lubrication 14 has the task of ensuring the functionality and smooth running of the bearing over a relatively large temperature range.
  • the hot exhaust gas flows in the flow direction 7 according to the arrangement of the valve flaps 8a and 8b either through the first 4a or the second exhaust gas return line 4b.
  • the exhaust gas also flows around the shaft 22, as a result of which it absorbs heat and, among other things, forwards it into the bearing device 9.
  • the bearing housing 12 is connected to the flange via a structural thermal bridge 10 such that a maximum temperature of less than 400 ° C., in particular less than 300 ° C., is applied to the bearing housing 12 during operation of the internal combustion engine 3 , having.
  • the structural thermal bridge 10 has a shortest length 21 between the flange 2 and the bearing housing 12 and an average thickness 25 oriented perpendicular thereto.
  • the ratio of the average thickness 25 to the shortest length 21 is at least 0.1.
  • the bearing housing 12 and the thermal bridge 10 each have cooling fins 23. In this way, the heat transport can be supported by convection or heat radiation.
  • the shaft (22) has a groove (28), a disc (29) being arranged in the groove (22) so that the bushing (13) rests on the disc (29).
  • the disc (29) rests on a contact surface of the bearing housing (12) and thus fixes the bushing (13) axially (15) to the shaft (22).
  • Such an arrangement has the advantage that the shaft (22) only has to be fixed exactly on the side with the bearing device (9) axially (15), this being done very inexpensively by a corresponding design of the groove (28).
  • Figure 4 shows schematically and in a partial view another according to the invention
  • Embodiment of the valve arrangement 1 has one
  • the valve arrangement 1 has a first 4a and a second exhaust gas recirculation line 4b, each with a first 8a and a second
  • Valve flap 8b (not shown), the valve flaps 8a and 8b rotatable with a common shaft 22 in a bearing device 9 with a
  • the first valve flap 8a is offset from the second valve flap 8b (not shown) by 90 °.
  • Bearing device 9 is arranged in a bearing housing 12 and has one
  • Socket 13 made of bronze.
  • the bronze bush 13 ensures a quick
  • the bearing housing 12 is connected to the flange 2 via a structural thermal bridge 10 in order to be able to dissipate the heat.
  • the illustrated embodiment enables heat to be dissipated to the exhaust gas cooler 6 via the connection piece 30, which is connected to a significantly cooler exhaust gas cooler 6 (not shown).
  • connection piece has in particular the same properties with regard to thermal conductivity and / or thermal capacity as a thermal bridge 10. This ensures that the bearing housing 12 has a maximum temperature of less than 400 ° C. during operation of the internal combustion engine 3.
  • the illustrated embodiment additionally offers the possibility of introducing cooling medium 32 into a channel 31, which also contributes to cooling the bearing housing.
  • FIG. 5 shows a schematic sectional view (VV) of the bearing housing 12 in FIG. 4.
  • Two connecting pieces 30 are arranged on the bearing housing 12 and are connected to an exhaust gas cooler 6 (not shown).
  • the coolant 32 (indicated by the arrows) of the exhaust gas cooler 6 flows through the channels 31 and in this way cools the bearing housing 12.
  • the individual channels 31 are bores which can also be designed as through bores, the through bores being sealed or closed by means of closure pieces 33 are that there is no leakage.
  • the coolant 32 is then fed back to the exhaust gas cooler 6. Such an arrangement of channels is particularly easy and quick to manufacture.
  • FIG. 6 shows a schematic detailed view of a particularly preferred embodiment of a bearing housing 12 with a seal 36.
  • the bearing housing 12 has means for sealing so that, for example, no exhaust gas from the exhaust gas recirculation line 4a through the bore 37, which serves to receive the shaft 22, or Lubricant 14, not shown, reaches the outside.
  • the production of a type of labyrinth seal 36 is preferred, graphite foil 35 being arranged in the bearing housing 12 between the bearing device 9 and a sleeve 34.
  • the graphite foil 35 as such or in the form of a preformed Grap tringes wound around the shaft 22, placed, or the like and deformed by means of the bearing device 9 and the sleeve 13, so that preferably there are no continuous gaps between the individual foil sections, but always the graphite foil sections at least partially abut each other.
  • This type of seal 36 is suitable for sealing through bores 37 which are provided in the bearing housing 12, which contains exhaust gas, which in particular has a very low oxygen content.
  • the seal 36 shown is particularly suitable for use in mobile exhaust technology due to its temperature suitability up to approximately 700 ° C or 900 ° C. In the embodiment shown, it is also possible, for example, that the Graphite foil 35 at least partially results in graphite lubrication 14 or supports it.
  • valve arrangement according to the invention for an exhaust gas recirculation system of an internal combustion engine is very inexpensive to manufacture and at the same time ensures a long service life, since the thermal stresses in the bearing device during operation of the internal combustion engine have been significantly reduced compared to known valve arrangements.
  • Bearing device 0 thermal bridge 1 engine block 2 bearing housing 3 bushing 4 graphite lubrication 5 swivel axis 6a first bulge 6b second bulge 7 drive 8 control unit a first valve flap level b second valve flap level

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

L'invention concerne un dispositif soupape (1) destiné à un système de recyclage des gaz d'échappement d'un moteur à combustion interne (3), comportant une bride (2) destinée au bridage sur un puits thermique ayant une gamme de température définie, en particulier un bloc refroidi par eau (11) du moteur à combustion interne (3). Ledit dispositif comporte également une première (4a) et une deuxième conduites de recyclage des gaz d'échappement (4b) présentant respectivement un premier (8a) et un deuxième clapets de soupape (8b). Les clapets de soupape (8a, 8b) sont disposés dans un élément palier (9) comportant un logement de palier (12) de façon à être mis en rotation par un arbre commun (22), la disposition desdits clapets l'un par rapport à l'autre étant telle qu'au moins une conduite de recyclage des gaz d'échappement (4a, 4b) peut respectivement être fermée. Le dispositif selon l'invention est caractérisé en ce que le logement de palier (12) est relié à la bride (2) par l'intermédiaire d'un pont thermique structurel (10) de manière que le logement de palier (12) présente une température maximale inférieure à 400 °C, de préférence inférieure à 300 °C lors du fonctionnement du moteur à combustion interne (3). Un tel dispositif soupape de fabrication particulièrement économique présente une longue durée de vie même dans le cas de températures très élevées du flux de gaz d'échappement.
EP01974209A 2000-08-24 2001-08-23 Dispositif soupape a double clapet et pont thermique destines a un systeme de recyclage des gaz d'echappement et procede d'utilisation Expired - Lifetime EP1311754B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10041579 2000-08-24
DE10041579A DE10041579A1 (de) 2000-08-24 2000-08-24 Ventilanordnung mit Doppelklappe und Wärmebrücke für ein Abgasrückführungssystem und Verfahren zu deren Betrieb
PCT/EP2001/009729 WO2002016750A1 (fr) 2000-08-24 2001-08-23 Dispositif soupape a double clapet et pont thermique destines a un systeme de recyclage des gaz d'echappement et procede d'utilisation

Publications (2)

Publication Number Publication Date
EP1311754A1 true EP1311754A1 (fr) 2003-05-21
EP1311754B1 EP1311754B1 (fr) 2004-11-10

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Family Applications (1)

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EP01974209A Expired - Lifetime EP1311754B1 (fr) 2000-08-24 2001-08-23 Dispositif soupape a double clapet et pont thermique destines a un systeme de recyclage des gaz d'echappement et procede d'utilisation

Country Status (4)

Country Link
EP (1) EP1311754B1 (fr)
AU (1) AU2001293787A1 (fr)
DE (2) DE10041579A1 (fr)
WO (1) WO2002016750A1 (fr)

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DE50104500D1 (de) 2004-12-16
WO2002016750A1 (fr) 2002-02-28
EP1311754B1 (fr) 2004-11-10
DE10041579A1 (de) 2002-03-07
AU2001293787A1 (en) 2002-03-04

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