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
  • 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
  • F01N13/1827—Sealings specially adapted for exhaust systems
• • 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
  • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
  • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
  • F01N13/1844—Mechanical joints
  • F01N13/185—Mechanical joints the connection being realised by deforming housing, tube, baffle, plate, or parts thereof
• • 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
  • F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/02—Sealings between relatively-stationary surfaces
  • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
  • F16J15/064—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces the packing combining the sealing function with other functions
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16J—PISTONS; CYLINDERS; SEALINGS
  • F16J15/00—Sealings
  • F16J15/02—Sealings between relatively-stationary surfaces
  • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
  • F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
  • F16J15/0818—Flat gaskets
• • 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
  • F02M26/12—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems characterised by means for attaching parts of an EGR system to each other or to engine parts

Definitions

• the present invention relates to a seal with a sieve insert for an exhaust gas recirculation in the exhaust line of a motor vehicle that is driven by an internal combustion engine.
• the invention also relates to a production method for such an EGR seal with a sieve insert.
• the sieve seal has a sieve part in the form of a sieve element with a three-dimensional design in the form of an approximately cup-shaped curvature, which is affixed in the region of the sealing function.
• the present invention is thus based on the knowledge that the significant pressure loss of known sieve seals is largely caused by a comparatively low effective cross-sectional area.
• fleece cloth is understood below to also mean knits or random layered structures such as fleeces, which all feature an outstanding heat resistance.
• a corresponding production method is based on the fact that an element composed of sieve cloth with an edge that is crimped over in a radially outward direction is deformed and inserted into a sealing element provided with a closed collar, with the edge of the element composed of mesh cloth encompasses the collar of the sealing element in such a way that at least a part of the edge embraces the collar from behind.
• a part of the edge and the collar are permanently connected to each other by folding or cramping so that a fluid can pass this arrangement only by traveling through the sieve element.
• a sieve element having said characteristics in operation is produced by deep drawing a region that is perforated by means of lasing, etching, or punching and is connected to the seal.
• the sieve element is produced by deep drawing a region that is perforated by means of lasing, etching, or punching and is connected to the seal.
• This region that has been perforated in the preparatory steps can thus be composed of the material of the seal, which has not been cut out or punched out in a region through which subsequent flow will pass and therefore remains integrally and tightly joined to the seal.
• the sieve element is connected to a seal by means of a bead that is closed in the form of a ring or the connection of the seal to the sieve element is embodied by means of a transition of the seal into the sieve element, with the sieve element embodied in the form of a perforated or micro-perforated deep drawn component.
• characteristics in operation is produced by deep drawing a region that is perforated by means of lasing, etching, or punching and is connected to the seal.
• the seal has at least one circularly closed plate extending concentrically around the bead. Further, in the transition from the seal to the bead, a flank extends at a slope angle a.
• the cup-shaped sieve element can be conically or cylindrically shaped.
• the sieve element can be embodied as a cylindrical section that is closed at one free end, in particular by means of a circular piece of sieve cloth or by means of a compression and/or final closing of the sieve cloth by means of folding.
• the sieve seal has a sieve part in the form of a sieve element with a three-dimensional design in the form of an
• manufactured according to the invention thus particularly features a lower overall height and low radial width, reduced materials usage, and therefore a lower overall weight.
• the clamping device is embodied as a retaining strap.
• a clamping device of this kind can be fixed in position as part of a widening of the internally situated sieve element and the collar of the seal, forming an essentially cylindrically shaped connecting region.
• this deformation can turn out to be comparatively small.
• Fig. 1 shows a detail of an exhaust gas recirculation, not shown in detail, in the exhaust line of a motor vehicle, in a sectional side view;
• Fig. 2 is a sectional side view of another embodiment of a sieve seal
• Figs. 6a - 6d show sectional side views of other embodiments of sieve seals with variation of a connecting region between the sieve element and the seal;
• Fig. 1 shows a detail of an exhaust gas recirculation, not shown in detail, in the exhaust line of a motor vehicle.
• a sieve seal 1 is provided in a plane D for the performance of a sealing function between a first flange 2 and a second flange 3.
• the sieve seal 1 has a sieve element 4, which is only indicated here, with a three-dimensional design that will be explained in greater detail below.
• the sieve element 4 is affixed to a seal 5 so that gases can travel via a full free cross- sectional area A of a pipe 6 adjoining the flange 3, through the sieve 4.
• the attachment of the sieve element 4 to the seal 5 is carried out, for example, by means of a folding that will be described in greater detail below, which forms a bead 7 that is closed into a ring shape.
• a radial recess 8 is provided on the first flange 2. This recess 8 is dimensioned in order to accommodate the bead 7 so that when fixing the flanges 2, 3 by means of recesses 9, the seal 5 undergoes a full compression by means of them.
• Fig. 2 shows another embodiment of a sieve element 4 in a sectional side view.
• the sieve element 4 extends from the bead 7, tapering essentially in the shape of a truncated cone, into an end region 11, which in this instance is circular and is composed of the same sieve material as the casing of the truncated cone-shaped remaining part of the sieve element 4.
• the sieve seal 1 is a basically rotationally symmetrical component, which in the present embodiment, has external projections 10 of the seal 5 that deviate from this rotational symmetry.
• the seal 5 also has a circular, closed plate 12 extending concentrically around the bead 7.
• a method for producing a connection between the sieve element 4 and the seal 5 will be depicted in conjunction with the sequence of Figs 3a - 3e by means of details of a sectional side view of another embodiment of a sieve seal 1.
• a crimped-over edge 14 that extends radially outward is preformed onto the sieve element 4 at a free end region 13.
• this edge 14 is being drawn so that it is further oriented inward.
• the sieve element 4 is then inserted into the associated seal 5; the seal 5, which was essentially flat before with a circumferential swage 15 has been provided with a closed collar 16.
• the closed collar 16 of the seal 5 and the crimped-over edge 14 of the sieve element 4 are matched to each other so that the crimped-over edge partially embraces the collar 16 from behind. According to the depiction in
• the seal element is inserted so that the edge 14 of the element 4 composed of sieve cloth encompasses the collar 16 of the seal in such a way that at least part of the edge 14 embraces the collar 16 from behind and engages to a significant depth with the swage 15.
• a compression step then occurs.
• the arrangement looks like the depiction shown in Fig. 3e: the seal 5 comes to an end in a remaining part of the swage 15 in which the bead 7 lies. Thanks to the sequence of parts of the seal 5 and sieve element 4 firmly joined to one another by folding, a fluid traveling through the sieve element 4 can flow through the arrangement on the other side of the dashed line. In the course of the final pressing procedure, therefore, a part of the edge 14 and of the collar 16 are permanently connected to each other by means of folding or cramping so that a fluid can pass through this arrangement only through the unoccupied part of the sieve element 4.
• Fig. 4a shows details of a sectional side view to illustrate a production of a connection between the sieve element 4 and the seal 5 of another embodiment of a sieve seal 1 analogous to the sequence of Figs. 3a - 3e.
• the collar 16 adjoining the swage 15 of the seal 5 protrudes at approximately right angles, see Fig. 4a.
• the free end region 13 of the sieve element 4 comes to an end in a region extending approximately parallel to the collar 16 and ends at a crimped-over edge 14 extending radially outward, which embraces the collar 16 from above and behind. In a first step, this edge 14 is placed against the collar 16. This arrangement is then folded over by almost 90° and is placed flat into the swage 15, see Fig. 4b.
• An angle a indicates a slope of a flank at the transition from the seal 5 to the bead 7 that is formed in this way.
• Figs. 5a through 5d shows views of another embodiment of a sieve seal 1.
• This sieve seal 1 is axially symmetrical having two projections 10 situated on opposite sides, see Fig. 5a.
• Figs. 6a - 6d show sectional side views of other embodiments of sieve seals 1. These embodiments differ with regard to the respective embodiment of the connecting region between the seal 5 and the sieve element 4; the exemplary embodiments described above essentially correspond to the sketch shown in Fig. 6a. For this reason, it is not addressed in further detail here.
• an important problem in sieve elements 4 composed of woven or braided fibers is to eliminate their lack of cross-sectional leak-tightness.
• the sieve element 4 together with a respective connection to the seal 5 must lie outside the region with the sealing function or must be enclosed by it in a sealed fashion.
• the embodiment shown in Fig. 6b includes a clamping ring 17 that becomes part within the connection of the sieve element 4 to the seal 5.
• the clamping ring 17 is connected to the collar 16 of the seal 5 by means of folding and on the other hand, it is affixed to the free end region 13 of the sieve element 4 by means of a material connection like welding in the embodiment of Fig. 6b. Consequently, a welding edge 18 constitutes a transition from the sieve element 4 via the clamping ring 17 to the region of high cross-sectional leak-tightness so that a flow through the sieve seal 1 is only possible through the sieve element 4 on the other side of the welding edge 18.
• the embodiment according to Fig. 6d also includes the use of a clamping ring 17 with the design of the bead 7.
• Fig. 6c discloses a solution in which a closed collar 16 on the seal 5 is omitted.
• the sieve element 4 is produced by deep drawing a region that is
• connection of the seal 5 to the end region 13 of the sieve element 4 is embodied by means of a transition of the seal 5 into the sieve element 4, with the sieve element 4 embodied in the form of a perforated or micro- perforated deep drawn component having a very high cross- sectional leak-tightness in comparison to every sieve cloth.
• Fig. 7a corresponds to that of Fig. 6a and shows an alternative design of the embodiment according to Figs. 2a and 2b with a cup-shaped sieve element 4
• Figs. 7b - 7e show other embodiments of sieve seals 1 for direct
• connection between the seal 5 and sieve element 4 and its height h and radial width w of this bead due to the multiple layers of material can turn out to be disadvantageous.
• a swage 15 in the seal 5 and also a recess 8 in a first flange 2 must be correspondingly dimensioned in order to be able to also provide for an appropriate leak-tightness of the overall arrangement.
• the depictions in Figs. 7b to 7e show exemplary embodiments of the invention in which a permanent connection between the closed collar 16 on the seal 5 and the respective sieve element 4 is produced by means of a clamping device instead of by using a clamping ring that overlaps the bead 7 or by means of multiple folding.
• the sieve element 4 with an edge 14 that is crimped over toward the outside is inserted through the seal 5 until the crimped-over edge 14 engages behind or at least encompasses the collar 16.
• a clamping device in this case embodied in the form of a retaining strap 19, is installed, which is fixed in position by means of a subsequent widening of the collar 16 along the indicating arrow.
• This widening can, for example, be produced by a spreading action exerted when a truncated cone is pushed in. Consequently, the sieve element 4 is simultaneously connected to the seal 5 permanently. This eliminates the need for at least one
• a height h' that is indicated in the drawings, which are not to scale, can easily be set to be less than the height h in Fig. 7a.
• a width w' of the bead 7 is significantly less than the radial width w from Fig. 7a, if only because of the small number of material layers.
• a corresponding modification for reducing a height to a dimension h" while approximately maintaining a width w' as w" can be achieved through the use of a clamping ring 20.
• the ring 20 can have a reduced height in comparison to the

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Gasket Seals (AREA)
• Processes For Solid Components From Exhaust (AREA)
• Exhaust-Gas Circulating Devices (AREA)
• Exhaust Gas After Treatment (AREA)

Priority Applications (4)

Applications Claiming Priority (4)

Publications (1)

Family

ID=51564621

Family Applications (1)

Country Status (5)

Cited By (6)

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Citations (3)

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• 2014
  • 2014-08-01 EP EP14766667.1A patent/EP3027938B1/en active Active
  • 2014-08-01 KR KR1020167003853A patent/KR102031285B1/ko active Active
  • 2014-08-01 JP JP2016530546A patent/JP2016531252A/ja active Pending
  • 2014-08-01 CN CN201480043635.8A patent/CN105473909A/zh active Pending
  • 2014-08-01 WO PCT/EP2014/066613 patent/WO2015014992A1/en not_active Ceased

Patent Citations (3)

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