DE102018211807A1 - Exhaust gas recirculation arrangement for an internal combustion engine - Google Patents

Abstract

The invention relates to an exhaust gas recirculation arrangement (1) for an internal combustion engine (28), which has a housing (2) with a housing end face (4), via which the housing (2) is fluidly connected to a diffuser (3) a base plate (6) and a seal (7) are arranged between the diffuser (3) and the housing end face (4). A simplified assembly of the arrangement (1) and improved operational safety are achieved in that the arrangement (1) has a holder (13) attached to the housing (2) with a receiving structure projecting outside the housing end face (4) in the direction of the diffuser (3) (14), in which a nose (15) of the base plate (6) and a projection (16) of the seal (7) are received.
The invention also relates to an internal combustion engine system (27) with such an arrangement (1) and an assembly method for such an arrangement (1).

Description

The present invention relates to an exhaust gas recirculation arrangement for an internal combustion engine, with a housing through which exhaust gas flows during operation, and with a diffuser. The invention further relates to a method for mounting such an arrangement and an internal combustion engine system with such an arrangement.

The exhaust gas generated during the operation of an internal combustion engine can be recycled to reduce the pollutant emissions of the internal combustion engine and / or to reduce the fuel consumption of the internal combustion engine. Corresponding exhaust gas recirculation arrangements have a housing through which the exhaust gas flows during operation, also called a block, in which, for example, a cooler for cooling the exhaust gas can be arranged.

In order to influence the flow of the exhaust gas through the exhaust gas recirculation arrangement, generic arrangements also have a diffuser which is attached to the housing. For this purpose, end faces of the housing and of the diffuser facing one another are usually connected to one another via a base plate and a seal. The seal is usually flat and is placed between the end faces before the diffuser is attached to the housing. Before the diffuser is attached to the housing, there may be displacements and / or deformations of the seal which, on the one hand, make assembly more difficult and, on the other hand, can lead to a displacement of the seal relative to the end faces from a desired position. This leads to a greater likelihood of rejects in production and / or requires increased post-processing. In addition, this can lead to malfunctions and / or a shortened service life of the arrangement during operation of the arrangement.

The present invention is therefore concerned with the task of specifying improved or at least other embodiments for an exhaust gas recirculation arrangement of the type mentioned at the outset and for a method for mounting such an arrangement and for an internal combustion engine system with such an arrangement, which are in particular simplified installation and / or distinguish a more reliable operation and / or an extended service life of the arrangement.

This object is achieved according to the invention by the subject matter of the independent claims. Advantageous embodiments are the subject of the dependent claims.

The present invention is based on the general idea that in an exhaust gas recirculation arrangement for an internal combustion engine, both a base plate and a seal, which are each arranged between a housing end face of a housing of the arrangement and a diffuser end face of a diffuser of the arrangement, with the aid of a holder relative to to fix one of the end faces, in particular to the housing end face, in such a way that when the diffuser is subsequently attached to the housing, they do not move and / or do not bulge in the plane of the end face, in particular the housing end face, and the like. Thus, a desired position of the base plate and the seal relative to the end faces is determined by the holder before the diffuser is attached to the housing, this relative positioning being retained even during the attachment of the diffuser to the housing. As a result, the assembly of the arrangement is simplified. In addition, there are no or at least reduced leakages and the like during operation of the arrangement, so that operational reliability is increased. In addition, an aging process of the arrangement caused by the adjustment of the base plate and / or the seal from the predetermined, desired position is at least reduced.

According to the inventive concept, the exhaust gas recirculation arrangement has the housing, through which exhaust gas flows during operation, and in which, for example, a cooler for cooling the exhaust gas can be arranged. The housing has a housing end face which has at least one opening through which exhaust gas flows, hereinafter referred to as housing opening. The diffuser has a diffuser end face which is arranged opposite the arrangement of the housing end face and via which the diffuser is fluidly connected to at least one of the at least one housing openings. For this purpose, a diffuser opening can be provided on the diffuser face. The base plate and the seal are arranged between the end faces, the base plate and the seal each having openings through which exhaust gas flows during operation and thus fluidly connects the at least one housing opening to the diffuser. This means that the base plate has at least one plate opening, via which at least one housing opening is fluidly connected to the diffuser. In addition, the seal has at least one seal opening, via which at least one housing opening is fluidly connected to the diffuser. In addition, at least one sealing opening is advantageously fluidly connected to at least one plate opening. The arrangement also has the holder which is attached to the housing and which has a receiving structure projecting on the outside in the direction of the diffuser on a side edge of the housing front side which delimits the housing front side. In the receiving structure, on the one hand, the base plate is at least one over the side edge in the direction of the Receiving structure protruding nose and on the other hand the seal received via at least one projection projecting beyond the side edge in the direction of the receiving structure and thus fixed relative to the housing end face.

The relative fixation of the base plate and the seal to the housing face means in particular that the base plate and the seal are secured against twisting and displacement relative to the housing face. In addition, the fixation preferably means that the base plate and / or the seal are secured against deformation in the manner of curvatures and the like.

The at least one nose and / or the at least one protrusion can each be accommodated in the receiving structure in any manner and thus be fixed accordingly. In particular, the nose and / or the projection can be positively received in the receiving structure. This allows the at least one nose and / or the at least one projection to be picked up quickly and easily in the receiving structure.

If the seal and the base plate are fixed relative to the end face with the aid of the holder, the diffuser is preferably attached to the housing in such a way that the diffuser end face is pressed and / or pressed against the housing end face. In particular, a screw connection can be used for this. For this purpose, the housing and the diffuser can have corresponding fixing openings. It is also conceivable to provide the base plate and / or the seal with associated fixing openings. It is advantageous here if associated fixing openings are arranged in alignment with one another and a bolt body of a screw connection, which can have a thread, is guided through the fixing openings, which are aligned with one another, for fastening the diffuser to the housing.

The base plate is expediently a separate component from the housing. In particular, this makes it possible to manufacture the base plate and the housing from different materials. The housing can be made of plastic, for example, which allows a simple and inexpensive manufacture of the housing. The base plate can be metallic, that is to say made of at least one metal or a metal alloy.

Advantageous embodiments provide that at least one nose of the base plate and at least one projection of the seal are received and fixed together in a receptacle of the receiving structure. This allows a simpler assembly of the arrangement and / or a simpler design of the holder.

In principle, the at least one nose of the base plate and the at least one projection of the seal can have identical shapes.

It is advantageous if at least one nose of the base plate and at least one projection of the seal have different shapes. This enables a simplified assembly of the arrangement. In particular, this makes it possible to fix the seal and the base plate in the respectively provided position on the front face of the housing before the diffuser is attached to the housing. It is preferred if the lugs and the projections each have the same shape.

Embodiments have proven to be advantageous in which the common receptacle of the nose and the projection for the nose and the projection each have a corresponding receiving contour, hereinafter also referred to as the receiving section. This means that the common receptacle can have a first receptacle section for the nose and a second receptacle section adjoining the first receptacle section in front of the projection. Thus, the bracket can be manufactured more cheaply and easily. In addition, a sequence of assembly of the base plate and the seal can thereby be defined in a simplified manner and, in particular, an incorrect sequence of assembly can be prevented or a corresponding possibility can at least be reduced.

It is preferred if the seal has at least two such projections which are spaced apart from one another along the side edge, the respective projection being accommodated in the receiving structure. It is thus possible in a simplified manner to simply determine a relative position of the seal, in particular also a relative orientation of the seal relative to the plane of the housing end face, and to implement it during assembly. Embodiments in which the seal has three such projections have proven advantageous.

Analogously to this, the base plate advantageously has at least two, preferably three, lugs, which are spaced apart from one another along the side edge and are each accommodated in the receiving structure.

The respective receptacle for receiving the at least one nose and / or the at least one projection can in principle be designed in any way.

Embodiments are advantageous in which at least one of the receptacles, advantageously the respective receptacle, is designed as an opening which runs along the housing end face. Consequently In particular, the at least one nose and / or the at least one projection can be introduced and / or accommodated in a simplified manner in the receptacle when the arrangement is being assembled. Furthermore, the holder, in particular the receiving structure, can thus be designed in the manner of a grid or in the form of a grid or rib. Such a training increases in particular the mechanical stability of the holder.

In principle, the seal and the base plate can be attached to the front face of the housing in any order. Embodiments are preferred in which the base plate is arranged between the seal and the housing end face. The seal is thus arranged between the base plate and the diffuser face. It is advantageous here if the base plate, in particular directly, bears against the housing end face, while the seal, in particular directly, bears against the base plate. It is also preferred if the diffuser face, in particular directly, bears against the seal.

It goes without saying that, in addition to the arrangement, an internal combustion engine system with an internal combustion engine and such an arrangement also belongs to the scope of this invention. The arrangement for returning exhaust gas advantageously establishes a fluidically lockable connection between an exhaust gas system and a fresh air system of the internal combustion engine system.

It is further understood that a method for assembling the exhaust gas recirculation arrangement also belongs to the scope of this invention.

Further important features and advantages of the invention emerge from the subclaims, from the drawings and from the associated description of the figures with reference to the drawings.

It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the combination indicated in each case, but also in other combinations or on their own without departing from the scope of the present invention.

Preferred exemplary embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description, the same reference numerals referring to the same or similar or functionally identical components.

• 1 einen Ausschnitt einer Seitenansicht einer Abgasrückführ-Anordnung,
• 2 eine Explosionsdarstellung der Anordnung in isometrischer Ansicht,
• 3 eine Seitenansicht durch die Anordnung,
• 4 eine stark vereinfachte, schaltpanartige Darstellung eines Brennkraftmaschinensystems mit der Anordnung.

Each shows schematically:

• 1 a section of a side view of an exhaust gas recirculation arrangement,
• 2 an exploded view of the arrangement in an isometric view,
• 3 a side view through the arrangement,
• 4 a greatly simplified, switch-panel-like representation of an internal combustion engine system with the arrangement.

An exhaust gas recirculation arrangement 1 , below also briefly arrangement 1 called, such as in the 1 to 3 can be seen, has a housing 2 , also block 2 called, as well as a diffuser 3 on who just in 1 hatched is indicated. The housing 2 and the diffuser 3 are via a housing front 4 of the housing 2 and a diffuser face 5 of the diffuser 3 fluidly connected to each other. Here are the housing 2 and the diffuser 3 in the operation of the arrangement 1 flowed through by exhaust gas. The order 1 also has a base plate 6 as well as a seal 7 on which between the end faces 4 . 5 are arranged. Here is the base plate 6 on the front of the housing 4 on while the seal 7 on the bottom plate 6 is applied. The bottom plate 6 is thus between the seal 7 and the housing front 4 arranged. Here is in 2 the bottom plate 6 im on the front of the case 4 attached state shown while the seal 7 to the bottom plate 6 is shown spaced. 3 shows a side view through the arrangement 1 in a parallel to the front of the housing 4 trending level. The housing 2 is advantageously made of plastic, whereas the base plate 6 is made of a metal or a metal alloy.

Like the one in particular 2 and 3 can be removed, the front of the housing runs 4 in one of a longitudinal direction 8th and one transverse to the longitudinal direction 8th transverse direction 9 spanned level. The front of the case 4 is from one to one across the longitudinal direction 8th and across the cross direction 9 extending height direction 10 and thus in a circumferential direction 11 surrounding margin 12 laterally limited. The bottom plate 6 and the seal 7 run essentially parallel to the front of the housing 4 , preferably also to the diffuser face 5 , The order 1 has a bracket 13 on that on the case 2 is attached and a receiving structure 14 has, the outside of the side edge 12 towards the diffuser face 5 protrudes and thus along the height direction 10 the page margin 12 surmounted. The bottom plate 6 has at least one nose 15 on that along the case front 4 runs and the margin 12 towards the receiving structure 14 surmounted. The at least one nose 15 is in the reception structure 14 added. In the example shown, the base plate has 6 several such noses 15 , in particular three such noses 15 , which in the circumferential direction 11 and thus along the side edge 12 are spaced from each other. The reception structure 14 fixes the base plate 6 over the at least one nose 15 relative to the front of the housing 4 , such that the bottom plate 6 in the plane of the housing front 4 and thus in the circumferential direction 11 not moved. This also secures the base plate 6 against movements in the longitudinal direction 8th and cross direction 9 given. The seal 7 has at least one protruding protrusion 16 on, which is parallel to the front of the housing 4 extends and towards the receiving structure 14 from the side margin 12 projects. At least a head start 16 the seal 7 is in the reception structure 14 added such that the seal 7 relative to the front of the housing 4 is fixed. So that's the seal 7 against relative movements to the front of the housing 4 in the longitudinal direction 8th , the transverse direction 9 as well as in the height direction 10 and in the circumferential direction 11 secured. In the example shown, the seal points 7 three such projections 16 on which in the circumferential direction 11 and thus along the side edge 12 spaced from each other and each in the receiving structure 14 are included.

In particular 1 it can be seen that one of the projections 16 with an associated nose 15 the bottom plate 6 in a joint recording 17 the reception structure 14 is recorded, the recording 17 in the example shown as a breakthrough 18 is formed, which extends along the housing face 4 extends. So the reception structure 14 formed like a lattice or rib.

In the example shown, the projection 16 and the nose 15 different shapes and sizes. The recording shows 17 one of the nose 15 the bottom plate 6 associated first receiving section 19 as well as the protrusion of the seal 7 associated second receiving section 20 on.

Especially the 2 and 3 it can be seen that the fluidic connection between the housing 2 and the diffuser 3 via housing openings 21 on the front of the housing 4 of the housing 2 , Plate openings 22 the bottom plate 6 as well as sealing openings 23 the seal 7 he follows. The fluidic connection between the housing 2 and the diffuser 3 is done through the plate openings 22 and seal openings 23 , It can also be seen that the housing 2 , the bottom plate 6 as well as the seal 7 several fixing openings aligned with each other 24 have, wherein through mutually aligned fixing openings 24 a bolt body 25 a screw connection, not otherwise shown 26 for attaching the diffuser 3 on the housing 2 are led.

The order 1 is in particular part of an internal combustion engine system 27 as it is in 4 is greatly simplified and shown schematically. The internal combustion engine system 27 points next to the arrangement 1 an internal combustion engine 28 , a fresh air system 29 for supplying the internal combustion engine 28 with fresh air and an exhaust system 30 for removing exhaust gas from the internal combustion engine 28 on. The order 1 connects the exhaust system 30 for returning exhaust gas to the internal combustion engine 28 with the fresh air system 29 fluidic, this connection being advantageously lockable.

Claims (10)

Exhaust gas recirculation arrangement (1) for an internal combustion engine (28), with a housing (2) through which exhaust gas flows during operation and which has a housing end face (4) with at least one housing opening (21) through which exhaust gas flows, - The housing end face (4) is delimited by a peripheral side edge (12), with a diffuser (3) which has a diffuser end face (5) opposite the housing end face (4), via which the diffuser (3) is fluidly connected to the at least one housing opening (21), with a base plate (6) arranged between the diffuser end face (5) and the housing end face (4), which has at least one plate opening (22) via which at least one housing opening (21) is fluidly connected to the diffuser (3), - With a seal (7) arranged between the diffuser end face (5) and the housing end face (4), which has at least one sealing opening (23), via which at least one housing opening (21) is fluidly connected to the diffuser (3), - With a holder (13) attached to the housing (2), which has a side edge (12) of the housing end face (4) on the outside in the direction of the diffuser end face (5) projecting receiving structure (14) in which the side edge (12) in Nose (15) of the base plate (6) projecting in the direction of the receiving structure (14) is received in such a way that the base plate (6) is fixed relative to the housing end face (4), - The seal (7) has at least one projection (16) which projects beyond the side edge (12) in the direction of the receiving structure (14) and is received in the receiving structure (14) such that the seal (7) is relative to the housing front side ( 4) is fixed. Arrangement after Claim 1 , characterized in that at least one nose (15) and at least one projection (16) are accommodated together in a receptacle (17) of the receptacle structure (14). Arrangement after Claim 1 or 2 , characterized in that the at least one of the at least one lugs (16) and at least one of the at least one protrusions (15) have different shapes. Arrangement after Claim 2 and 3 , characterized in that the common receptacle (17) has a first receptacle section (19) for the nose (15) and a second receptacle section (20) adjoining the first receptacle section (19) for the projection (16). Arrangement according to one of the Claims 1 to 4 , characterized in that the seal (7) has at least two such projections (16) which are spaced apart from one another along the side edge (12) and are each received in the receiving structure (14). Arrangement according to one of the Claims 2 to 5 , characterized in that at least one of the at least one receptacles (17) is designed as an opening (18) in the holder (13) running along the housing end face (4). Arrangement according to one of the Claims 1 to 6 , characterized in that the seal (7) between the base plate (6) and the diffuser face (5) is arranged. Arrangement according to one of the Claims 1 to 7 , characterized in that - in the housing end face (4), in the base plate (6) as well as in the seal (7) and in the diffuser end face (5) there are in each case fixing openings (24) which are aligned with one another, - that a bolt body ( 25) a screw connection (26) fixing the diffuser (3) to the housing (2) is guided through the fixing openings (24) aligned with one another. Internal combustion engine system (27) with an internal combustion engine (28) and with an exhaust gas recirculation arrangement (1) according to one of the Claims 1 to 8th The arrangement (1) fluidly connects a fresh air system (29) and an exhaust system (30) of the internal combustion engine system (27). Method for mounting an exhaust gas recirculation arrangement (1) according to one of the Claims 1 to 8th , wherein - the base plate (6) is arranged on the housing end face (4) and the at least one nose (15) is inserted into the receiving structure (14), - the seal (7) is arranged on the base plate (6) and the at least a projection (16) is inserted into the receiving structure (14), - the diffuser (3) is arranged on the seal (7), - the diffuser (3) is attached to the housing (2).

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