EP3032063B1 - Exhaust pipe - Google Patents
Exhaust pipe Download PDFInfo
- Publication number
- EP3032063B1 EP3032063B1 EP15197831.9A EP15197831A EP3032063B1 EP 3032063 B1 EP3032063 B1 EP 3032063B1 EP 15197831 A EP15197831 A EP 15197831A EP 3032063 B1 EP3032063 B1 EP 3032063B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tubular body
- cavity
- attachment
- pipe
- attachment part
- 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.)
- Active
Links
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 230000000295 complement effect Effects 0.000 claims description 4
- 239000011358 absorbing material Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 21
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 230000003584 silencer Effects 0.000 description 7
- 238000013016 damping Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 230000030279 gene silencing Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000005382 thermal cycling Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/24—Silencing apparatus characterised by method of silencing by using sound-absorbing materials
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
- F01N1/04—Silencing apparatus characterised by method of silencing by using resonance having sound-absorbing materials in resonance chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1805—Fixing exhaust manifolds, exhaust pipes or pipe sections to each other, to engine or to vehicle body
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/18—Construction facilitating manufacture, assembly, or disassembly
- F01N13/1888—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells
- F01N13/1894—Construction facilitating manufacture, assembly, or disassembly the housing of the assembly consisting of two or more parts, e.g. two half-shells the parts being assembled in longitudinal direction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N1/00—Silencing apparatus characterised by method of silencing
- F01N1/02—Silencing apparatus characterised by method of silencing by using resonance
- F01N1/026—Annular resonance chambers arranged concentrically to an exhaust passage and communicating with it, e.g. via at least one opening in the exhaust passage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2310/00—Selection of sound absorbing or insulating material
- F01N2310/04—Metallic wool, e.g. steel wool, copper wool or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2470/00—Structure or shape of gas passages, pipes or tubes
- F01N2470/02—Tubes being perforated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2490/00—Structure, disposition or shape of gas-chambers
- F01N2490/14—Dead or resonance chambers connected to gas flow tube by relatively short side-tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2490/00—Structure, disposition or shape of gas-chambers
- F01N2490/15—Plurality of resonance or dead chambers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2490/00—Structure, disposition or shape of gas-chambers
- F01N2490/15—Plurality of resonance or dead chambers
- F01N2490/155—Plurality of resonance or dead chambers being disposed one after the other in flow direction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2490/00—Structure, disposition or shape of gas-chambers
- F01N2490/16—Chambers with particular shapes, e.g. spherical
Definitions
- the present invention relates to an exhaust gas pipe of an exhaust system of an internal combustion engine according to the preamble of claim 1.
- the invention also relates to an exhaust system, which is equipped with at least one such pipe.
- An exhaust system which serves to remove combustion exhaust gases from an internal combustion engine, fulfills a number of functions.
- the most important functions are, on the one hand, the implementation of exhaust gas aftertreatment in order to reduce the pollutant emissions of the internal combustion engine.
- the exhaust system causes an intensive sound attenuation to reduce the noise emissions of the internal combustion engine.
- Silencers with a small damping volume can be positioned virtually anywhere along the exhaust system and acoustically connect with a pipe of the exhaust system leading to exhaust gas.
- a tubular housing of such a silencer can be arranged concentrically to such an exhaust pipe and connected thereto via end-side end floors.
- a perforation in the exhaust pipe then leads to the acoustic coupling between the exhaust system, ie the interior of the exhaust pipe and a damping chamber formed in the housing, which surrounds the exhaust pipe annular.
- the problem with such simple mufflers is the different thermal load of the exhaust pipe on the one hand and the tubular housing on the other.
- the exhaust pipe is exposed to significantly higher temperature fluctuations than the housing, so that the connection points between the housing and the exhaust pipe, which are located at the front end of the housing, high thermal Alternating loads are exposed.
- the exhaust pipes used in the exhaust system can also contribute to the stability of the exhaust system, for example, if about such an exhaust pipe two relatively heavy components of the exhaust system must be connected to each other.
- a generic exhaust pipe leading an exhaust system of an internal combustion engine is from the JP 2012-122402 A known. It comprises a tubular body carrying exhaust gas, which has an interior, and a separate attachment with respect to the tubular body, which is laterally attached to the tubular body so that outside of the tubular body is arranged at least partially limited by the fixture cavity extending in the circumferential direction of the tubular body extends over less than 360 °.
- the cavity is closed to the outside. Furthermore, the cavity is fluidically and / or acoustically connected to the interior.
- the attachment is attached to two opposite sides of the tubular body to the tubular body, wherein the attachment is fixed on the respective side of the tubular body by means of a welded connection to the tubular body, which extends in the longitudinal extent of the tubular body along the tubular body.
- Another exhaust pipe leading tube is from the US 2012/0186905 A1 known in which a separate attachment by means of pipe clamps attached to the tubular body is. Further exhaust pipes are out of the US 2011/0186373 A1 , from the JP H05-214930 A and from the EP 0 120 181 A1 known.
- the present invention is concerned with the problem of providing for an exhaust pipe leading the above type or for an exhaust system equipped therewith an improved embodiment, which is characterized in particular by an additional function.
- an increased dimensional stability or rigidity is sought for the exhaust pipe.
- a particularly inexpensive manufacturability of a silencer may be desired.
- a compact design for the exhaust pipe with muffler function may also be desired.
- the invention is based on the general idea, the exhaust gas pipe, which is also referred to as the exhaust pipe to equip with a respect to a tubular body of the exhaust pipe separately manufactured attachment, wherein the attachment is externally attached to the tubular body, such that the outside of the tubular body a cavity is formed which is completely or partially delimited by the attachment. Furthermore, the attachment and tube body are coordinated so that the attachment extends in the circumferential direction of the tubular body over less than 360 ° and preferably over 180 ° or less than 180 °. By attaching the attachment to the tubular body, the exhaust pipe is stiffened in the region of the attachment.
- the attachment is designed or arranged on the tubular body that a cavity in addition to the exhaust gas leading interior of the tubular body is formed, results transversely to the longitudinal direction of the tubular body an increased area moment of inertia, which significantly increases the rigidity of the exhaust pipe.
- the provision of the cavity also provides the ability to use the cavity as a sound attenuation space, whereby the exhaust pipe can be modified to a silencer.
- Such a silencer can be realized relatively inexpensively, since essentially only the attachment to the pipe body of the exhaust pipe must be mounted.
- the arrangement of the attachment to the exhaust pipe also leads to an extremely compact design, so that the exhaust pipe presented here virtually at any point of the exhaust system between the beginning, the is usually formed by an exhaust manifold, and their end, which is usually formed by a tailpipe, realize.
- the cavity is closed to the outside.
- the cavity is fluidically and / or acoustically connected to an interior of the tubular body.
- the cavity is filled with sound-absorbing material.
- the attachment is attached to two opposite sides of the tubular body on the tubular body.
- the attachment extends along the longitudinal direction of the tubular body, so that the attachment of the attachment to the tubular body in cross-section of the tubular body takes place on two opposite sides and preferably on two diametrically opposite sides.
- the direct coupling of the attachment to the tubular body, in particular a good thermal coupling between attachment and tubular body is achieved, so that the temperature difference between the tubular body and fixture is reduced. As a result, also thermally induced stresses between fixture and tubular body are reduced.
- the attachment is mounted on the respective side of the tubular body by means of a welded connection to the tubular body, which extends in the longitudinal direction of the tubular body along the tubular body. Since the fixation between attachment and tubular body thus takes place along the longitudinal direction of the tubular body, thermally induced expansion differences only lead to comparatively low stresses within the weld, since this is only loaded in its longitudinal direction.
- An embodiment in which the respective welded connection extends over the entire length of the attachment is advantageous. As a result, the thermal cycling of the respective weld is minimized.
- the attachment may be a one-piece shell body having a U-shaped cross-section and two legs connected by an arc transverse to a longitudinal extension of the exhaust duct of the tubular body, attached to opposite sides of the tubular body.
- the design of the attachment as a shell body allows a particularly inexpensive feasibility of the attachment and the exhaust pipe so equipped.
- the cavity is then limited on the one hand by an inner wall of the attachment and on the other hand by an outer wall of the tubular body.
- the tubular body is perforated in the region of the attachment.
- a perforation can in principle be configured in any desired manner, for example by a single wall opening or preferably by a multiplicity, comparatively smaller wall openings.
- an acoustic coupling of the tube interior with the cavity whereby the cavity can be used as Schalldämpfungsraum.
- the cavity serves as an expansion chamber or as an absorption chamber.
- a "genuine" Helmholtz resonator can also be realized if a so-called “neck” containing the oscillatory volume is provided in a suitable manner.
- a neck of the Helmholtz resonator can be produced by a branch pipe branching off from the pipe body within the attachment, by a corresponding geometry of the attachment, or by an exhibition or excavation of the pipe body during production of a wall opening in the pipe body.
- a sound attenuation can be realized by means of micro perforation, if the openings of the perforation have an opening cross section of a maximum of 1 mm.
- the attachment is a manufactured one piece further or other tubular body having a connection side which is shaped complementary to an outer wall of the exhaust gas pipe body, to which the additional tubular body is grown, so that the connection side contacted the outer wall surface. Due to the surface contact between the outside and the outer wall, an intense heat transfer between attachment and tubular body can be realized, which reduces thermally induced stresses due to temperature differences.
- the cavity is limited at least in the cross section of the exhaust pipe exclusively by an inner side of the attachment. This allows a shaping of the cavity independently of the exhaust gas pipe body.
- connection side of the attachment part and the outer wall of the exhaust-gas-conducting tubular body are perforated in the region of the contact between connection side and outer wall. This also makes an acoustic coupling created between the interior of the exhaust gas flowed through the tubular body and the non-perfused cavity of the attachment to realize a sound-damping function.
- the perforations of connection side and outer wall can basically be configured identically. It is also possible to design the perforations differently.
- the outer wall of the tube may be formed with a perforation formed by a plurality of openings, while the connection side has a perforation formed by a single opening which extends over all the openings of the perforation of the outer wall. Likewise, a reverse design is conceivable.
- the cavity can be closed in the longitudinal extension of the tubular body at each end by a closure element.
- a closure at the longitudinal ends of the cavity is especially necessary when the respective cavity is acoustically and ultimately also fluidically coupled to the interior of the tubular body.
- the respective closure element can basically represent a separate component with respect to the attachment, which is fastened to the attachment in a suitable manner. It is also conceivable to form the respective closure element integrally on the attachment. Furthermore, it is conceivable to fasten the respective closure element to the tubular body. It is also conceivable to form at least one such closure element integrally on the tubular body.
- the exhaust pipe leading body can basically have any spatial length. For example, it may extend arcuately or rectilinearly.
- tubular body extends in a straight line or has a rectilinear section
- at least two such attachment parts on the tubular body which are in the circumferential direction of the tubular body and / or in the longitudinal direction of the tubular body offset from one another are arranged on the tubular body.
- the space available along the exhaust system can be exploited particularly favorably to provide a stiffening and / or a silencing function by attaching a plurality of such attachments to the respective exhaust pipe.
- the tubular body may extend curved so that it has a bow.
- the attachment is then arranged on an inner side of the sheet on the tubular body. In this way, a particularly efficient stiffening of the curved tubular body results in the region of the arc.
- the attachment can be shaped so that the cavity is closed in the longitudinal extension of the tubular body at each end by the tubular body itself, even if this no additional closure elements are formed on the attachment.
- the attachment is adapted to the curvature or to the arc of the tubular body, that the cavity is closed on all sides, when the attachment is attached to the tubular body. This measure also simplifies the production of the exhaust pipe presented here with attachment and cavity.
- the attachment is a one-piece shell body having a U-shaped cross-section with two legs connected via a bow transversely to a longitudinal extent of the tubular body at opposite Side of the tubular body are attached.
- the two legs are curved in each case at its edge remote from the arc of the shell body according to the arc of the tubular body. Since then also the If necessary, this weld follows this edge, resulting in a significant stiffening of the tubular body in the region of its arc.
- An exhaust gas system comprises at least one exhaust aftertreatment device, which may be configured, for example, as a catalytic converter or as a particle filter or as a silencer or as any desired combination of such components.
- the exhaust aftertreatment device or its housing is connected on the inlet side and the outlet side in each case to an exhaust pipe leading piece of pipe.
- the exhaust system according to the invention is now formed at least in such a piece of pipe through an exhaust pipe of the type described above, which is characterized by an additional function, namely by an increased stiffness and optionally by a silencing function.
- the exhaust system 1 has a plurality of pipe sections 5, for example, to connect two exhaust aftertreatment devices 2 with each other or to connect the exhaust manifold 3 with such an exhaust aftertreatment device 2.
- the exhaust aftertreatment devices 2 may be, for example, a catalytic converter 6, a particulate filter 7 and a silencer 8.
- a housing 35 of the respective exhaust aftertreatment device 2 is connected to such a pipe section 5 on the inlet side and / or outlet side.
- the tailpipe 4 is directly connected to the silencer 8, the tailpipe 4.
- the exhaust system 1 is used for discharging combustion exhaust gases from an internal combustion engine 9, which is also equipped for fresh air supply with a fresh air system 10.
- internal combustion engine 9, exhaust system 1 and fresh air system 10 are arranged in a motor vehicle not shown here.
- Fig. 1 are two of the pipe sections 5 as the exhaust pipe leading 11, which may also be referred to below as the exhaust pipe 11, designed as follows.
- such an exhaust pipe 11 comprises a pipe section 15, which serves to guide an exhaust gas flow during operation of the exhaust system 1, and an attachment 12, which is not traversed by exhaust gas during operation of the exhaust system 1, which is a separate component with respect to the tubular body 15 and the the tubular body 15 is grown.
- a geometry of the attachment 12 and its arrangement on the tubular body 15 are coordinated so that outside of the tubular body 15, a cavity 13 is formed, which is at least partially bounded by the attachment 12.
- extending the attachment 12 and the cavity 13 in a circumferential direction 14 of the tubular body 15 is not complete, that is less than 360 ° and preferably over 180 ° along the tubular body 15 of the exhaust pipe 11.
- the tubular body 15 performs the exhaust gas leading function the exhaust pipe 11 and can therefore be referred to as a flow-through or exhaust pipe leading body 15.
- the attachment 12 is attached to two opposite sides of the tubular body 15 on the tubular body 15.
- two welds 16 each, which fix the attachment 12 on the tubular body 15.
- the respective weld 16 which can also be generally referred to as welded joint 16, extends in a longitudinal direction 17 or longitudinal extent 17 of the tubular body 15 along the tubular body 15.
- the longitudinal direction 17 or the longitudinal extension 17 of the tubular body 15 follows a longitudinal central axis 18 of the tubular body 15, which according to the examples of Fig. 4 and 5a to 5d and 6a to 6d in a straight line or according to the example of Fig. 5e and 6e can be curved.
- the respective welded connection 16 can extend over the entire length of the attachment 12 in the longitudinal direction 17 along the tubular body 15.
- the attachment 12 may be a shell body 19, which is made in one piece, so in one piece.
- the shell body 19 is provided transversely to the longitudinal extent 17 of the tubular body 15 with a substantially U-shaped cross section, in which two legs 20 are connected to each other via a sheet 21.
- the opposing legs 20 are attached to opposite sides of the tubular body 15.
- the tubular body 15 perforated in the region of the attachment 12, that is equipped with a perforation 22, which is formed purely by way of example by a plurality of separate openings 23.
- an inner space 24 of the tubular body 15 is acoustically and ultimately also fluidically coupled to the cavity 13.
- the cavity 13 is not flowed through by the exhaust gas.
- the cavity 13 thus serves as a sound damping chamber, for example as an absorption chamber or as a reflection chamber.
- a sound-absorbing material 25 for example, metal wool or the like.
- the attachment 12 may be configured instead of a shell body 19 alternatively as a further tubular body 26, which is also suitably made in one piece or in one piece.
- This further tubular body 26 is not traversed by exhaust gas in contrast to the exhaust-carrying tubular body 15 and has a connection side 27 which is shaped to be complementary to an outer wall 28 of the exhaust-carrying tubular body 15.
- this complementary connection side 27 of the further tubular body 26 is attached to the outer wall 28 of the exhaust pipe tube body 15, such that the connection side 27 rests flat against the outer wall 28.
- an intensive heat transfer between the exhaust gas pipe body 15 and the further tubular body 26 of the fixture 12 is achieved.
- connection side 27 and the outer wall 28 are perforated in the region of the contact between the outer side 27 and the outer wall 28.
- the exhaust pipe leading body 15 is again provided with a perforation 22 which is formed by a plurality of openings 23.
- a perforation 29 of the further tubular body 26 is formed purely by way of example by a single opening 30 which covers the entire region of the perforation 22 of the tubular body 15 carrying exhaust gas. It is also conceivable to provide such a window-like opening in the exhaust gas-carrying tubular body 15, while then the further tubular body 26 a Having formed by a plurality of openings perforation.
- the aforementioned variant is preferred because of the reduced flow resistance. Again, an acoustic and ultimately fluidic coupling between the in the cavity 13 and the interior 24 is created by the perforations 22, 29.
- Fig. 4 can the cavity 13 in the longitudinal extension 17 of the tube 11 and the exhaust gas pipe body 15 are closed at each of its longitudinal ends or front ends in each case by a closure element 31.
- a closure element 31 As a result, the shape of the attachment 12.
- closure elements 31 are basically not required to achieve the desired stiffening of the exhaust pipe body 15 and the exhaust pipe 11.
- the cavity 13 must be sealed tight on all sides, except for the area of the perforation 22.
- the two closure elements 31 are designed both as regards the exhaust-carrying tubular body 15 and with respect to the attachment 12 as separate components, which are grown both to the attachment 12 and to the tubular body 15.
- corresponding welds or welds are not shown here.
- respective closure elements 31 form integrally on the tubular body 15 or integrally on the attachment 12.
- the exhaust pipe 11 is generally straight. Its tubular body 15 thus extends straight.
- two attachments 12 are attached to the tubular body 15.
- the two attachments 12 in the longitudinal direction 17 of the tubular body 15 are mutually offset on the tubular body 15.
- a and b of FIGS. 5 and 6 are the two attachments 12 diametrically opposite, that is offset by 180 ° in the circumferential direction 14 to each other on the tubular body 15. This makes it possible in particular to fix the two attachments 12 via common welds 16 on the tubular body 15.
- FIGS. 5 and 6 are the attachments 12 in the longitudinal direction 17 each sized the same size. In principle, it is also conceivable to dimension the two attachment parts 12 unevenly.
- the embodiment c of FIGS. 5 and 6 differs from the embodiment b of the FIGS. 5 and 6 in that the two attachments 12 are not exactly diametrically opposed, but are aligned at a different angle from 180 ° to each other. This can be advantageous for adapting the exhaust pipe 11 to special installation situations.
- the attachments 12 can be attached as explained exclusively for stiffening purposes on the tubular body 15. This stiffening is particularly efficient when, with the help of the attachment 12 said cavity 13 is provided outside the exhaust pipe body 15 leading, as this significantly increases the area moment of inertia of the entire exhaust pipe 11.
- the embodiment is preferred in which the cavity 13 is used as a sound-damping chamber, so that an acoustic coupling between the interior 24 of the tubular body 15 and the cavity 13 is made.
- the closure elements 31 may be provided for this purpose. However, these closure elements 31 are in Fig. 6a to d not shown.
- the exhaust pipe 11 and its tubular body 15 extend curved so that the tubular body 15 has a bow 33.
- the attachment 12 is now preferably arranged on an inner side 34 of the sheet 33 on the tubular body 15.
- the curved tube 11 can stiffen particularly efficient.
- the attachment 12 according to the Fig. 5e and 6e each specifically be shaped so that the cavity 13 is closed at its longitudinal ends in each case by the tubular body 15 directly. This can be realized particularly easily when the attachment 12 is configured as a shell body 19. Separate or additional closure elements 31 can thus be dispensed with.
- the two legs 20 of the U-shaped shell body 19 each have a distance from the rectilinear arc 21 of the shell body 19 edge along which the weld 16 extends.
- Said edge has a curvature which corresponds to the curvature of the arc 33 of the tubular body 15, that is, has substantially the same radius of curvature.
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- Engineering & Computer Science (AREA)
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- Exhaust Silencers (AREA)
Description
Die vorliegende Erfindung betrifft ein Abgas führendes Rohr einer Abgasanlage einer Brennkraftmaschine gemäß dem Oberbegriff des Anspruchs 1. Die Erfindung betrifft außerdem eine Abgasanlage, die mit wenigstens einem derartigen Rohr ausgestattet ist.The present invention relates to an exhaust gas pipe of an exhaust system of an internal combustion engine according to the preamble of
Eine Abgasanlage, die zum Abführen von Verbrennungsabgasen von einer Brennkraftmaschine dient, erfüllt mehrere Funktionen. Die wichtigsten Funktionen sind dabei einerseits die Durchführung einer Abgasnachbehandlung, um die Schadstoffemissionen der Brennkraftmaschine zu reduzieren. Andererseits bewirkt die Abgasanlage eine intensive Schalldämpfung, um die Lärmemissionen der Brennkraftmaschine zu reduzieren. Schalldämpfer mit einem kleinen Dämpfungsvolumen lassen sich dabei quasi beliebig entlang der Abgasanlage positionieren und mit einem Abgas führenden Rohr der Abgasanlage akustisch verbinden. Beispielsweise kann ein rohrförmiges Gehäuse eines derartigen Schalldämpfers konzentrisch zu einem derartigen Abgasrohr angeordnet werden und über stirnseitige Endböden damit verbunden werden. Eine Perforation im Abgasrohr führt dann zur akustischen Kopplung zwischen der Abgasanlage, also dem Inneren des Abgasrohrs und einem im Gehäuse ausgebildeten Dämpfungsraum, der das Abgasrohr ringförmig umschließt. Problematisch bei derartigen einfachen Schalldämpfern ist jedoch die unterschiedliche thermische Belastung des Abgasrohrs einerseits und des rohrförmigen Gehäuses andererseits. In der Regel ist das Abgasrohr deutlich höheren Temperaturschwankungen ausgesetzt als das Gehäuse, so dass die Anbindungsstellen zwischen Gehäuse und Abgasrohr, die sich an den stirnseitigen Endböden des Gehäuses befinden, hohen thermischen Wechselbelastungen ausgesetzt sind. Zur Lösung dieses Problems ist grundsätzlich denkbar, das Abgasrohr innerhalb des Gehäuses, also zwischen zwei Endböden, die das Gehäuse am Abgasrohr fixieren, zu unterbrechen oder mit einem Schiebesitz auszustatten, so dass letztlich das Gehäuse in der Längsrichtung des Abgasrohrs relativ zum Abgasrohr beweglich gehalten ist. Eine derartige Bauform ist jedoch vergleichsweise kostenintensiv. Außerdem können Probleme hinsichtlich der Gasdichtigkeit auftreten.An exhaust system, which serves to remove combustion exhaust gases from an internal combustion engine, fulfills a number of functions. The most important functions are, on the one hand, the implementation of exhaust gas aftertreatment in order to reduce the pollutant emissions of the internal combustion engine. On the other hand, the exhaust system causes an intensive sound attenuation to reduce the noise emissions of the internal combustion engine. Silencers with a small damping volume can be positioned virtually anywhere along the exhaust system and acoustically connect with a pipe of the exhaust system leading to exhaust gas. For example, a tubular housing of such a silencer can be arranged concentrically to such an exhaust pipe and connected thereto via end-side end floors. A perforation in the exhaust pipe then leads to the acoustic coupling between the exhaust system, ie the interior of the exhaust pipe and a damping chamber formed in the housing, which surrounds the exhaust pipe annular. The problem with such simple mufflers, however, is the different thermal load of the exhaust pipe on the one hand and the tubular housing on the other. In general, the exhaust pipe is exposed to significantly higher temperature fluctuations than the housing, so that the connection points between the housing and the exhaust pipe, which are located at the front end of the housing, high thermal Alternating loads are exposed. To solve this problem is in principle conceivable to interrupt the exhaust pipe within the housing, ie between two end floors, which fix the housing on the exhaust pipe, or equipped with a sliding seat, so that ultimately the housing is held movable in the longitudinal direction of the exhaust pipe relative to the exhaust pipe , However, such a design is relatively expensive. In addition, problems with gas tightness may occur.
Die in der Abgasanlage verwendeten Abgasrohre können außerdem zur Stabilität der Abgasanlage beitragen, beispielsweise wenn über ein derartiges Abgasrohr zwei relativ schwere Komponenten der Abgasanlage miteinander verbunden werden müssen.The exhaust pipes used in the exhaust system can also contribute to the stability of the exhaust system, for example, if about such an exhaust pipe two relatively heavy components of the exhaust system must be connected to each other.
Eine gattungsgemäßes Abgas führendes Rohr einer Abgasanlage einer Brennkraftmaschine ist aus der
Ein anderes Abgas führendes Rohr ist aus der
Die vorliegende Erfindung beschäftigt sich mit dem Problem, für ein Abgas führendes Rohr der vorstehend genannten Art bzw. für eine damit ausgestattete Abgasanlage eine verbesserte Ausführungsform anzugeben, die sich insbesondere durch eine Zusatzfunktion auszeichnet. Insbesondere ist gemäß einem Aspekt der Erfindung eine erhöhte Formstabilität bzw. Steifigkeit für das Abgasrohr angestrebt. Gemäß einem weiteren Aspekt der Erfindung kann eine besonders preiswerte Herstellbarkeit eines Schalldämpfers erwünscht sein. Als zusätzlicher Aspekt kann außerdem eine kompakte Bauform für das Abgasrohr mit Schalldämpferfunktion angestrebt sein.The present invention is concerned with the problem of providing for an exhaust pipe leading the above type or for an exhaust system equipped therewith an improved embodiment, which is characterized in particular by an additional function. In particular, according to one aspect of the invention, an increased dimensional stability or rigidity is sought for the exhaust pipe. According to a further aspect of the invention, a particularly inexpensive manufacturability of a silencer may be desired. As an additional aspect, a compact design for the exhaust pipe with muffler function may also be desired.
Das erfindungsgemäße Problem wird durch den Gegenstand des unabhängigen Anspruchs gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.The problem of the invention is solved by the subject matter of the independent claim. Advantageous embodiments are the subject of the dependent claims.
Die Erfindung beruht auf dem allgemeinen Gedanken, das Abgas führende Rohr, das im Folgenden auch als Abgasrohr bezeichnet wird, mit einem bezüglich eines Rohrkörpers des Abgasrohrs separat hergestellten Anbauteil auszustatten, wobei das Anbauteil außen an den Rohrkörper angebaut ist, derart, dass außen am Rohrkörper ein Hohlraum entsteht, der vollständig oder teilweise vom Anbauteil begrenzt ist. Des Weiteren sind Anbauteil und Rohrkörper so aufeinander abgestimmt, dass sich das Anbauteil in der Umfangsrichtung des Rohrkörpers über weniger als 360° und vorzugsweise über 180° oder über weniger als 180° erstreckt. Durch die Anbringung des Anbauteils am Rohrkörper wird das Abgasrohr im Bereich des Anbauteils versteift. Da das Anbauteil so ausgestaltet bzw. am Rohrkörper angeordnet ist, dass sich ein Hohlraum zusätzlich zum Abgas führenden Innenraum des Rohrkörpers ausbildet, ergibt sich quer zur Längsrichtung des Rohrkörpers ein erhöhtes Flächenträgheitsmoment, was die Steifigkeit des Abgasrohrs signifikant erhöht. Die Bereitstellung des Hohlraums eröffnet außerdem die Möglichkeit, den Hohlraum als Schalldämpfungsraum zu nutzen, wodurch das Abgasrohr zu einem Schalldämpfer modifiziert werden kann. Ein derartiger Schalldämpfer lässt sich vergleichsweise preiswert realisieren, da im Wesentlichen nur das Anbauteil am Rohrkörper des Abgasrohrs angebracht werden muss. Die Anordnung des Anbauteils am Abgasrohr, derart, dass sich das Anbauteil maximal über die Hälfte des Umfangs des Rohrkörpers erstreckt, führt außerdem zu einer extrem kompakten Bauform, so dass sich das hier vorgestellte Abgasrohr quasi an jeder beliebigen Stelle der Abgasanlage zwischen deren Anfang, der in Regel durch einen Abgaskrümmer gebildet ist, und deren Ende, das in der Regel durch ein Endrohr gebildet ist, realisieren lässt.The invention is based on the general idea, the exhaust gas pipe, which is also referred to as the exhaust pipe to equip with a respect to a tubular body of the exhaust pipe separately manufactured attachment, wherein the attachment is externally attached to the tubular body, such that the outside of the tubular body a cavity is formed which is completely or partially delimited by the attachment. Furthermore, the attachment and tube body are coordinated so that the attachment extends in the circumferential direction of the tubular body over less than 360 ° and preferably over 180 ° or less than 180 °. By attaching the attachment to the tubular body, the exhaust pipe is stiffened in the region of the attachment. Since the attachment is designed or arranged on the tubular body that a cavity in addition to the exhaust gas leading interior of the tubular body is formed, results transversely to the longitudinal direction of the tubular body an increased area moment of inertia, which significantly increases the rigidity of the exhaust pipe. The provision of the cavity also provides the ability to use the cavity as a sound attenuation space, whereby the exhaust pipe can be modified to a silencer. Such a silencer can be realized relatively inexpensively, since essentially only the attachment to the pipe body of the exhaust pipe must be mounted. The arrangement of the attachment to the exhaust pipe, such that the attachment extends a maximum of half the circumference of the tubular body, also leads to an extremely compact design, so that the exhaust pipe presented here virtually at any point of the exhaust system between the beginning, the is usually formed by an exhaust manifold, and their end, which is usually formed by a tailpipe, realize.
Erfindungsgemäß ist vorgesehen, dass der Hohlraum nach außen verschlossen ist. Zusätzlich ist vorgesehen, dass der Hohlraum mit einem Innenraum des Rohrkörpers fluidisch und/oder akustisch verbunden ist. Ferner kann optional vorgesehen sein, dass der Hohlraum mit schallabsorbierendem Material befüllt ist.According to the invention it is provided that the cavity is closed to the outside. In addition, it is provided that the cavity is fluidically and / or acoustically connected to an interior of the tubular body. Furthermore, it can optionally be provided that the cavity is filled with sound-absorbing material.
Erfindungsgemäß ist das Anbauteil an zwei voneinander abgewandten Seiten des Rohrkörpers am Rohrkörper befestigt. Das Anbauteil erstreckt sich dabei entlang der Längsrichtung des Rohrkörpers, so dass auch die Befestigung des Anbauteils am Rohrkörper im Querschnitt des Rohrkörpers an zwei gegenüberliegenden Seiten und vorzugsweise an zwei sich diametral gegenüberliegenden Seiten erfolgt. Durch die unmittelbare Kopplung des Anbauteils mit dem Rohrkörper wird insbesondere eine gute thermische Kopplung zwischen Anbauteil und Rohrkörper erreicht, so dass die Temperaturdifferenz zwischen Rohrkörper und Anbauteil reduziert ist. In der Folge reduzieren sich auch thermisch bedingte Spannungen zwischen Anbauteil und Rohrkörper.According to the invention, the attachment is attached to two opposite sides of the tubular body on the tubular body. The attachment extends along the longitudinal direction of the tubular body, so that the attachment of the attachment to the tubular body in cross-section of the tubular body takes place on two opposite sides and preferably on two diametrically opposite sides. The direct coupling of the attachment to the tubular body, in particular a good thermal coupling between attachment and tubular body is achieved, so that the temperature difference between the tubular body and fixture is reduced. As a result, also thermally induced stresses between fixture and tubular body are reduced.
Erfindungsgemäß ist das Anbauteil auf der jeweiligen Seite des Rohrkörpers mittels einer Schweißverbindung am Rohrkörper befestigt, die sich in der Längserstreckungsrichtung des Rohrkörpers entlang des Rohrkörpers erstreckt. Da die Fixierung zwischen Anbauteil und Rohrkörper somit entlang der Längsrichtung des Rohrkörpers erfolgt, führen thermisch bedingte Dehnungsdifferenzen nur über vergleichsweise geringe Spannungen innerhalb der Schweißnaht, da diese nur in ihrer Längsrichtung belastet ist. Vorteilhaft ist eine Ausführungsform, bei der sich die jeweilige Schweißverbindung über die gesamte Länge des Anbauteils erstreckt. Hierdurch ist die thermische Wechselbelastung der jeweiligen Schweißnaht minimiert.According to the invention, the attachment is mounted on the respective side of the tubular body by means of a welded connection to the tubular body, which extends in the longitudinal direction of the tubular body along the tubular body. Since the fixation between attachment and tubular body thus takes place along the longitudinal direction of the tubular body, thermally induced expansion differences only lead to comparatively low stresses within the weld, since this is only loaded in its longitudinal direction. An embodiment in which the respective welded connection extends over the entire length of the attachment is advantageous. As a result, the thermal cycling of the respective weld is minimized.
Bei einer nicht erfindungsgemäßen Ausführungsform kann das Anbauteil ein aus einem Stück hergestellten Schalenkörper sein, der quer zu einer Längserstreckung des Abgasführendes Rohrkörpers einen U-förmigen Querschnitt und zwei über einen Bogen verbundene Schenkel aufweist, die an gegenüberliegenden Seiten des Rohrkörpers befestigt sind. Die Ausgestaltung des Anbauteils als Schalenkörper ermöglicht eine besonders preiswerte Realisierbarkeit des Anbauteils und des damit ausgestatteten Abgasrohrs. Der Hohlraum wird dann einerseits durch eine Innenwand des Anbauteils und andererseits durch eine Außenwand des Rohrkörpers begrenzt.In an embodiment not according to the invention, the attachment may be a one-piece shell body having a U-shaped cross-section and two legs connected by an arc transverse to a longitudinal extension of the exhaust duct of the tubular body, attached to opposite sides of the tubular body. The design of the attachment as a shell body allows a particularly inexpensive feasibility of the attachment and the exhaust pipe so equipped. The cavity is then limited on the one hand by an inner wall of the attachment and on the other hand by an outer wall of the tubular body.
Erfindungsgemäß ist der Rohrkörper im Bereich des Anbauteils perforiert sein. Eine derartige Perforation kann grundsätzlich auf beliebige Weise ausgestaltet sein, beispielsweise durch eine einzige Wandöffnung oder vorzugsweise durch eine Vielzahl, vergleichsweise kleinere Wandöffnungen. Durch die Perforation erfolgt eine akustische Kopplung des Rohrinnenraums mit dem Hohlraum, wodurch der Hohlraum als Schalldämpfungsraum genutzt werden kann. Beispielsweise dient der Hohlraum als Expansionskammer oder als Absorptionskammer. Bei gezielter Abstimmung der Perforation bzw. der Öffnungen der Perforation kann auch eine Art Helmholtz-Resonator realisiert werden, dessen Resonanzvolumen durch den Hohlraum begrenzt ist und dessen Schwingungsvolumen innerhalb der Öffnungen der Perforation gebildet ist. Grundsätzlich kann auch ein "echter" Helmholtz-Resonator realisiert werden, wenn auf geeignete Weise ein sogenannter "Hals" bereitgestellt wird, der das schwingungsfähige Volumen enthält. Beispielsweise kann ein derartiger Hals des Helmholtz-Resonators durch ein innerhalb des Anbauteils vom Rohrkörper abzweigendes Abzweigrohr, durch eine entsprechende Geometrie des Anbauteils erzeugt werden oder durch eine Ausstellung oder Austulpung des Rohrkörpers beim Herstellen einer Wandöffnung im Rohrkörper erzeugt werden. Ebenso kann eine Schalldämpfung mittels Mikroperforation realisiert werden, wenn die Öffnungen der Perforation einen Öffnungsquerschnitt von maximal 1 mm besitzen.According to the invention, the tubular body is perforated in the region of the attachment. Such a perforation can in principle be configured in any desired manner, for example by a single wall opening or preferably by a multiplicity, comparatively smaller wall openings. Through the perforation, an acoustic coupling of the tube interior with the cavity, whereby the cavity can be used as Schalldämpfungsraum. For example, the cavity serves as an expansion chamber or as an absorption chamber. With specific tuning of the perforation or the openings of the perforation and a kind of Helmholtz resonator can be realized, the resonance volume is limited by the cavity and the vibration volume is formed within the openings of the perforation. In principle, a "genuine" Helmholtz resonator can also be realized if a so-called "neck" containing the oscillatory volume is provided in a suitable manner. By way of example, such a neck of the Helmholtz resonator can be produced by a branch pipe branching off from the pipe body within the attachment, by a corresponding geometry of the attachment, or by an exhibition or excavation of the pipe body during production of a wall opening in the pipe body. Likewise, a sound attenuation can be realized by means of micro perforation, if the openings of the perforation have an opening cross section of a maximum of 1 mm.
Erfindungsgemäß ist das Anbauteil ein aus einem Stück hergestellter weiterer oder anderer Rohrkörper, der eine Anschlussseite aufweist, die komplementär zu einer Außenwand des Abgas führenden Rohrkörpers geformt ist, an die der zusätzliche Rohrkörper angebaut ist, so dass die Anschlussseite die Außenwand flächig kontaktiert. Durch den flächigen Kontakt zwischen Außenseite und Außenwand lässt sich eine intensive Wärmeübertragung zwischen Anbauteil und Rohrkörper realisieren, was thermisch bedingte Spannungen aufgrund von Temperaturdifferenzen reduziert. Bei dieser Bauform ist der Hohlraum zumindest im Querschnitt des Abgasrohrs ausschließlich durch eine Innenseite des Anbauteils begrenzt. Dies ermöglicht eine Formgebung für den Hohlraum unabhängig vom Abgas führenden Rohrkörper.According to the invention, the attachment is a manufactured one piece further or other tubular body having a connection side which is shaped complementary to an outer wall of the exhaust gas pipe body, to which the additional tubular body is grown, so that the connection side contacted the outer wall surface. Due to the surface contact between the outside and the outer wall, an intense heat transfer between attachment and tubular body can be realized, which reduces thermally induced stresses due to temperature differences. In this design, the cavity is limited at least in the cross section of the exhaust pipe exclusively by an inner side of the attachment. This allows a shaping of the cavity independently of the exhaust gas pipe body.
Erfindungsgemäß sind die Anschlussseite des Anbauteils und die Außenwand des Abgas führenden Rohrkörpers im Bereich des Kontakts zwischen Anschlussseite und Außenwand perforiert. Auch hierdurch wird eine akustische Kopplung zwischen dem Innenraum des von Abgas durchströmten Rohrkörpers und dem nicht durchströmten Hohlraum des Anbauteils geschaffen, um eine Schalldämpfungsfunktion zu realisieren. Die Perforationen von Anschlussseite und Außenwand können grundsätzlich identisch konfiguriert sein. Ebenso ist es möglich, die Perforationen verschieden auszugestalten. Beispielsweise kann die Außenwand des Rohrs mit einer aus mehreren Öffnungen gebildeten Perforation gebildet sein, während die Anschlussseite eine Perforation aufweist, die durch eine einzige Öffnung gebildet ist, die sich über sämtliche Öffnungen der Perforation der Außenwand erstreckt. Ebenso ist eine umgekehrte Bauform denkbar.According to the invention, the connection side of the attachment part and the outer wall of the exhaust-gas-conducting tubular body are perforated in the region of the contact between connection side and outer wall. This also makes an acoustic coupling created between the interior of the exhaust gas flowed through the tubular body and the non-perfused cavity of the attachment to realize a sound-damping function. The perforations of connection side and outer wall can basically be configured identically. It is also possible to design the perforations differently. For example, the outer wall of the tube may be formed with a perforation formed by a plurality of openings, while the connection side has a perforation formed by a single opening which extends over all the openings of the perforation of the outer wall. Likewise, a reverse design is conceivable.
Entsprechend einer anderen vorteilhaften Ausführungsform kann der Hohlraum in der Längserstreckung des Rohrkörpers an jedem Ende durch ein Verschlusselement verschlossen sein. Ein derartiger Verschluss an den Längsenden des Hohlraums ist vor allem dann erforderlich, wenn der jeweilige Hohlraum akustisch und letztlich auch fluidisch mit dem Innenraum des Rohrkörpers gekoppelt ist. Das jeweilige Verschlusselement kann grundsätzlich bezüglich des Anbauteils ein separates Bauteil repräsentieren, das auf geeignete Weise am Anbauteil befestigt ist. Ebenso ist denkbar, das jeweilige Verschlusselement integral am Anbauteil auszuformen. Des Weiteren ist denkbar, das jeweilige Verschlusselement am Rohrkörper zu Befestigen. Auch ist denkbar, zumindest ein solches Verschlusselement integral am Rohrkörper auszuformen.According to another advantageous embodiment, the cavity can be closed in the longitudinal extension of the tubular body at each end by a closure element. Such a closure at the longitudinal ends of the cavity is especially necessary when the respective cavity is acoustically and ultimately also fluidically coupled to the interior of the tubular body. The respective closure element can basically represent a separate component with respect to the attachment, which is fastened to the attachment in a suitable manner. It is also conceivable to form the respective closure element integrally on the attachment. Furthermore, it is conceivable to fasten the respective closure element to the tubular body. It is also conceivable to form at least one such closure element integrally on the tubular body.
Der Abgas führende Rohrkörper kann grundsätzlich eine beliebige räumliche Längserstreckung aufweisen. Beispielsweise kann er sich bogenförmig oder geradlinig erstrecken.The exhaust pipe leading body can basically have any spatial length. For example, it may extend arcuately or rectilinearly.
Sofern sich der Rohrkörper geradlinig erstreckt oder einen geradlinigen Abschnitt aufweist, ist denkbar, zumindest zwei derartige Anbauteile am Rohrkörper anzuordnen, die in der Umfangsrichtung des Rohrkörpers und/oder in der Längsrichtung des Rohrkörpers zueinander versetzt am Rohrkörper angeordnet sind. Auf diese Weise lässt sich der entlang der Abgasanlage vorhandene Bauraum besonders günstig ausnutzen, um durch Anbringen mehrerer derartiger Anbauteile an dem jeweiligen Abgasrohr eine Aussteifung und/oder eine Schalldämpfungsfunktion vorzusehen.If the tubular body extends in a straight line or has a rectilinear section, it is conceivable to arrange at least two such attachment parts on the tubular body which are in the circumferential direction of the tubular body and / or in the longitudinal direction of the tubular body offset from one another are arranged on the tubular body. In this way, the space available along the exhaust system can be exploited particularly favorably to provide a stiffening and / or a silencing function by attaching a plurality of such attachments to the respective exhaust pipe.
Bei einer anderen vorteilhaften Ausführungsform kann sich der Rohrkörper gekrümmt erstrecken, so dass er einen Bogen aufweist. Zweckmäßig ist dann das Anbauteil an einer Innenseite des Bogens am Rohrkörper angeordnet. Auf diese Weise ergibt sich eine besonders effiziente Aussteifung des gekrümmten Rohrkörpers im Bereich des Bogens.In another advantageous embodiment, the tubular body may extend curved so that it has a bow. Appropriately, the attachment is then arranged on an inner side of the sheet on the tubular body. In this way, a particularly efficient stiffening of the curved tubular body results in the region of the arc.
Gemäß einer Weiterbildung kann das Anbauteil so geformt sein, dass der Hohlraum auch in der Längserstreckung des Rohrkörpers an jedem Ende durch den Rohrkörper selbst verschlossen ist, auch wenn hierzu am Anbauteil keine zusätzlichen Verschlusselemente ausgeformt sind. In diesem Fall ist das Anbauteil so an die Krümmung bzw. an den Bogen des Rohrkörpers angepasst, dass der Hohlraum allseits geschlossen ist, wenn das Anbauteil an den Rohrkörper angesetzt ist. Auch diese Maßnahme vereinfacht die Herstellung des hier vorgestellten Abgasrohrs mit Anbauteil und Hohlraum.According to a development, the attachment can be shaped so that the cavity is closed in the longitudinal extension of the tubular body at each end by the tubular body itself, even if this no additional closure elements are formed on the attachment. In this case, the attachment is adapted to the curvature or to the arc of the tubular body, that the cavity is closed on all sides, when the attachment is attached to the tubular body. This measure also simplifies the production of the exhaust pipe presented here with attachment and cavity.
Diese Ausführungsform kann besonders gut mit der weiter oben beschriebenen Ausführungsform kombiniert werden, bei der das Anbauteil ein aus einem Stück hergestellter Schalenkörper ist, der quer zu einer Längserstreckung des Rohrkörpers einen U-förmigen Querschnitt mit zwei über einen Bogen verbundenen Schenkeln aufweist, die an gegenüberliegenden Seiten des Rohrkörpers befestigt sind. Besonders vorteilhaft ist dabei eine Ausgestaltung, bei der die beiden Schenkel jeweils an ihrem vom Bogen des Schalenkörpers entfernten Rand entsprechend dem Bogen des Rohrkörpers gekrümmt sind. Da dann außerdem die gegebenenfalls vorhandene Schweißnaht diesem Rand folgt, ergibt sich eine signifikante Aussteifung des Rohrkörpers im Bereich seines Bogens.This embodiment can be particularly well combined with the embodiment described above, in which the attachment is a one-piece shell body having a U-shaped cross-section with two legs connected via a bow transversely to a longitudinal extent of the tubular body at opposite Side of the tubular body are attached. Particularly advantageous is an embodiment in which the two legs are curved in each case at its edge remote from the arc of the shell body according to the arc of the tubular body. Since then also the If necessary, this weld follows this edge, resulting in a significant stiffening of the tubular body in the region of its arc.
Eine erfindungsgemäße Abgasanlage umfasst zumindest eine Abgasnachbehandlungseinrichtung, die beispielsweise als Katalysator oder als Partikelfilter oder als Schalldämpfer oder als beliebige Kombination derartiger Komponenten ausgestaltet sein kann. Jedenfalls ist die Abgasnachbehandlungseinrichtung bzw. ihr Gehäuse einlassseitig und auslassseitig jeweils an ein Abgas führendes Rohrstück angeschlossen ist. Bei der erfindungsgemäßen Abgasanlage ist nun zumindest in derartiges Rohrstück durch ein Abgasrohr der vorstehend beschriebenen Art gebildet, das sich durch eine Zusatzfunktion, nämlich durch eine erhöhte Steifigkeit und optional durch eine Schalldämpfungsfunktion auszeichnet.An exhaust gas system according to the invention comprises at least one exhaust aftertreatment device, which may be configured, for example, as a catalytic converter or as a particle filter or as a silencer or as any desired combination of such components. In any case, the exhaust aftertreatment device or its housing is connected on the inlet side and the outlet side in each case to an exhaust pipe leading piece of pipe. In the exhaust system according to the invention is now formed at least in such a piece of pipe through an exhaust pipe of the type described above, which is characterized by an additional function, namely by an increased stiffness and optionally by a silencing function.
Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus den Zeichnungen und aus der zugehörigen Figurenbeschreibung anhand der Zeichnungen.Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated figure description with reference to the drawings.
Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.
Bevorzugte Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert, wobei sich gleiche Bezugszeichen auf gleiche oder ähnliche oder funktional gleiche Komponenten beziehen.Preferred embodiments of the invention are illustrated in the drawings and will be described in more detail in the following description, wherein like reference numerals refer to the same or similar or functionally identical components.
Es zeigen, jeweils schematisch,
- Fig. 1
- eine stark vereinfachte, schaltplanartige Prinzipdarstellung einer Abgasanlage mit mehreren Abgasrohren,
- Fig. 2
- ein stark vereinfachter Querschnitt eines nicht erfindungsgemäßen Abgasrohrs, entsprechend Schnittlinien II in
Fig. 1 , - Fig. 3
- ein Querschnitt wie in
Fig. 2 , jedoch bei einer erfindungsgemäßen Ausführungsform, - Fig. 4
- ein Längsschnitt des Abgasrohrs entsprechend Schnittlinien IV in
Fig. 2 , - Fig. 5
- mehrere Seitenansichten von Abgasrohren bei verschiedenen Ausführungsformen a bis e,
- Fig. 6
- isometrische Ansichten der Abgasrohre aus
Fig. 5 bei den verschiedenen Ausführungsformen a bis e.
- Fig. 1
- a greatly simplified schematic diagram of an exhaust system with several exhaust pipes,
- Fig. 2
- a greatly simplified cross section of a non-inventive exhaust pipe, according to section lines II in
Fig. 1 . - Fig. 3
- a cross section as in
Fig. 2 but in an embodiment according to the invention, - Fig. 4
- a longitudinal section of the exhaust pipe according to section lines IV in
Fig. 2 . - Fig. 5
- several side views of exhaust pipes in various embodiments a to e,
- Fig. 6
- isometric views of the exhaust pipes off
Fig. 5 in the various embodiments a to e.
Entsprechend
Die Abgasanlage 1 dient zum Abführen von Verbrennungsabgasen von einer Brennkraftmaschine 9, die zur Frischluftversorgung außerdem mit einer Frischluftanlage 10 ausgestattet ist. Zweckmäßig sind Brennkraftmaschine 9, Abgasanlage 1 und Frischluftanlage 10 in einem hier nicht näher dargestellten Kraftfahrzeug angeordnet.The
Im Beispiel der
Wie sich insbesondere den
Wie sich insbesondere den
Gemäß der in den
Gemäß
Gemäß
Bezugnehmend auf die
Gemäß den Varianten a bis d der
Bei den Ausführungsformen a, b und c der
Die Ausführungsform c der
Die Anbauteile 12 können wie erläutert ausschließlich zur Aussteifungszwecken am Rohrkörper 15 angebracht sein. Diese Aussteifung fällt dabei besonders effizient aus, wenn mit Hilfe des Anbauteils 12 besagter Hohlraum 13 außerhalb des Abgas führenden Rohrkörpers 15 geschaffen wird, da sich dadurch das Flächenträgheitsmoment des gesamten Abgasrohrs 11 signifikant vergrößert. Bevorzugt ist jedoch die Ausführungsform bei welcher der Hohlraum 13 als Schalldämpfungsraum genutzt wird, so dass eine akustische Kopplung zwischen dem Innenraum 24 des Rohrkörpers 15 und dem Hohlraum 13 besteht. Hierzu muss der Hohlraum 13 zu einer Umgebung 32 des Abgasrohrs 11 dicht sein. Wie vorstehend zu
Gemäß der Variante e der
Claims (9)
- A pipe (11), carrying exhaust gas, of an exhaust system (1) of an internal combustion engine (9),- with a tubular body (15) carrying exhaust gas and comprising an interior (24), and- with at least one attachment part (12) separate with respect to the tubular body (15), which is added laterally to the tubular body (15) so that externally on the tubular body (15) a cavity (13) is arranged delimited at least partially by the attachment part (12), which extends in the circumferential direction (14) of the tubular body (15) over less than 360°,- wherein the cavity (13) is closed to the exterior,- wherein the cavity (13) is fluidically and/or acoustically connected to the interior (24),- wherein the attachment part (12) is fastened on the tubular body (15) on two sides of the tubular body (15) facing away from one another,- wherein the attachment part (12) is fastened on the tubular body (15) on the respective side of the tubular body (15) by means of a welded connection (16), which extends in the longitudinal extent (17) of the tubular body (15) along the tubular body (15),characterized in- that the attachment part (12) is a further tubular body (26) produced from one piece, which has a connection side (27) which is shaped in a complementary manner to an outer wall (28) of the tubular body (15) carrying exhaust gas, to which the further tubular body (26) is added, so that the connection side (27) and the outer wall (28) lie in a planar manner against one another,- that the connection side (27) and the outer wall (28) are perforated in the region of the contact between connection side (27) and outer wall (28).
- The pipe according to Claim 1,
characterized in that
the cavity (13) is filled with sound-absorbing material (25). - The pipe according to Claim 1 or 2,
characterized in that
a perforation (22) of the tubular body (15) has a plurality of openings (23), which are adjacent to one another axially and/or in circumferential direction (14) of the tubular body (15). - The pipe according to one of Claims 1 to 3,
characterized in that
the cavity (13) is closed in the longitudinal extent (17) of the tubular body (15) at each end by a closure element (31). - The pipe according to Claim 4,
characterized in that
at least one such closure element (31) is fastened on the tubular body (15). - The pipe according to Claim 4 or 5,
characterized in that
at least one such closure element (31) is fastened on the attachment part (12) or is formed integrally thereon. - The pipe according to one of Claims 1 to 6,
characterized in that- the tubular body (15) extends in a straight line,- at least two such attachment parts (12) are added to the tubular body (15), which are arranged in the circumferential direction (14) of the tubular body (15) and/or in the longitudinal direction (17) of the tubular body (15) offset with respect to one another on the tubular body (15). - The pipe according to one of Claims 1 to 6,
characterized in that- the tubular body (15) extends in a curved manner and has a curve (33), wherein the attachment part (12) is arranged on an inner side (34) of the curve (33) on the tubular body (15),- the attachment part (12) is shaped so that the cavity (13) in the longitudinal extent (17) of the tubular body (15) is closed at each end by the tubular body (15) itself,- the attachment part (12) is a shell body (19) produced from one piece, which transversely to a longitudinal extent (17) of the tubular body (15) has a U-shaped cross-section with two legs (20) connected via a curve (21), which are fastened at opposite sides of the tubular body (15),- the two legs (20) respectively at their edge remote from the curve (21) of the shell body (19) are curved in accordance with the curve (33) of the tubular body (15). - An exhaust system of an internal combustion engine (9), which has at least one exhaust gas aftertreatment device (2), which is connected at the inlet side and at the outlet side respectively to a pipe section (15) carrying exhaust gas, wherein at least one such pipe section (5) is formed by an exhaust pipe (11) according to one of the preceding claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014225749.2A DE102014225749B4 (en) | 2014-12-12 | 2014-12-12 | Exhaust pipe leading and exhaust system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3032063A1 EP3032063A1 (en) | 2016-06-15 |
EP3032063B1 true EP3032063B1 (en) | 2018-06-20 |
Family
ID=54780215
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15197831.9A Active EP3032063B1 (en) | 2014-12-12 | 2015-12-03 | Exhaust pipe |
Country Status (4)
Country | Link |
---|---|
US (1) | US9644510B2 (en) |
EP (1) | EP3032063B1 (en) |
CN (1) | CN105697116B (en) |
DE (1) | DE102014225749B4 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104995378B (en) * | 2013-02-12 | 2019-06-25 | 佛吉亚排放控制技术美国有限公司 | Vehicle exhaust system with resonance damping |
DE102020100162B4 (en) | 2020-01-07 | 2023-01-12 | Umfotec Gmbh | Device for reducing airborne and structure-borne noise |
JP7399023B2 (en) * | 2020-04-27 | 2023-12-15 | 株式会社クボタ | Muffler device for work vehicle and work vehicle |
Family Cites Families (16)
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USRE25909E (en) * | 1965-11-23 | Sound attenuating gas conduit | ||
US3146850A (en) * | 1961-09-18 | 1964-09-01 | Arvin Ind Inc | Sound attenuating gas conduit |
US3263772A (en) * | 1964-06-17 | 1966-08-02 | Arvin Ind Inc | Sound attenuating gas conduit with one-quarter wave-length side branch chambers |
US3648803A (en) * | 1969-10-13 | 1972-03-14 | Walker Mfg Co | Exhaust system |
DE3460147D1 (en) * | 1983-02-23 | 1986-07-03 | Bbc Brown Boveri & Cie | Absorption silencer for gas-dynamic pressure wave machines |
JPS6210413A (en) * | 1985-07-08 | 1987-01-19 | Kawasaki Heavy Ind Ltd | Muffler |
JP2578233B2 (en) * | 1990-01-10 | 1997-02-05 | 日産自動車株式会社 | Mounting structure of heat shield plate for exhaust pipe |
JPH05214930A (en) | 1992-01-31 | 1993-08-24 | Suzuki Motor Corp | Exhaust device for automobile |
US5349141A (en) * | 1992-08-31 | 1994-09-20 | Tsuchiya Mfg. Co., Ltd. | Resonator type silencer having plural resonance chambers |
FR2916477B1 (en) * | 2007-05-25 | 2010-04-16 | Faurecia Sys Echappement | EXHAUST VOLUME FOR AN EXHAUST LINE OF A MOTOR VEHICLE |
DE102008005446A1 (en) | 2008-01-22 | 2009-07-23 | Denker, Dietrich, Prof. Dr.-Ing. | Device for lowering airborne sound of flow noises of air and gas-prominent pipes, has air and gas-prominent pipe and laterally added volumes, where laterally added volumes are divided into volume chambers |
WO2009110060A1 (en) * | 2008-03-04 | 2009-09-11 | 東京濾器株式会社 | Sound-deadening structure of vent tube and sound-deadening structure of case |
JP5406064B2 (en) * | 2010-01-29 | 2014-02-05 | 本田技研工業株式会社 | Exhaust system for motorcycles |
JP5608530B2 (en) | 2010-12-08 | 2014-10-15 | 本田技研工業株式会社 | Saddle riding |
JP5789377B2 (en) * | 2011-01-26 | 2015-10-07 | 本田技研工業株式会社 | Exhaust system structure of motorcycle |
DE102011007856A1 (en) | 2011-04-21 | 2012-10-25 | J. Eberspächer GmbH & Co. KG | silencer |
-
2014
- 2014-12-12 DE DE102014225749.2A patent/DE102014225749B4/en active Active
-
2015
- 2015-12-03 EP EP15197831.9A patent/EP3032063B1/en active Active
- 2015-12-10 CN CN201510917490.6A patent/CN105697116B/en active Active
- 2015-12-10 US US14/965,147 patent/US9644510B2/en active Active
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
US20160169070A1 (en) | 2016-06-16 |
DE102014225749B4 (en) | 2018-03-22 |
CN105697116B (en) | 2019-11-12 |
US9644510B2 (en) | 2017-05-09 |
CN105697116A (en) | 2016-06-22 |
DE102014225749A1 (en) | 2016-06-16 |
EP3032063A1 (en) | 2016-06-15 |
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