FR3062172A1 - DEVICE FOR DISTRIBUTING A RECIRCULATED FLOW OF AIR AND A FLOW OF EXHAUST GAS AND CORRESPONDING AIR INTAKE MODULE - Google Patents

Abstract

The invention relates to a device (5) for distributing an air flow and a recirculated exhaust gas stream, said device (5) being configured to be attached to the cylinder head (3) of an engine internal combustion engine, said device (5) comprising an intake manifold (11) configured to distribute the air flow into the cylinder head (3), and a recirculated exhaust gas distribution rail (13) . According to the invention, the intake manifold (11) is made of plastic, and the distribution rail (13) is made of metallic material and is integrated with the intake manifold (11). The invention also relates to an air intake module comprising such a dispensing device (5).

Description

@ Holder (s): VALEO THERMAL SYSTEMS Simplified joint-stock company.

O Extension request (s):

® Agent (s): VALEO SYSTEMES THERMIQUESTHS.

* 54) DEVICE FOR DISTRIBUTING AN AIR FLOW AND A RECIRCULATED EXHAUST GAS FLOW AND CORRESPONDING AIR INTAKE MODULE.

FR 3 062 172 - A1 (57) The invention relates to a device (5) for distributing an air flow and a recirculated exhaust gas flow, said device (5) being configured to be attached to the cylinder head (3) of an internal combustion engine of a motor vehicle, said device (5) comprising an intake manifold (11) configured to distribute the air flow in the cylinder head (3), and a distribution rail (13) of recirculated exhaust gases.

According to the invention, the intake manifold (11) is made of plastic, and the distribution rail (13) is made of metallic material and is integrated into the intake manifold (11).

The invention also relates to an air intake module comprising such a distribution device (5).

-1 Device for distributing an air flow and a recirculated exhaust gas flow and corresponding air intake module

The invention relates to the general field of supplying recirculated exhaust or supply air and exhaust gas to internal combustion engine engines. The invention relates to a distribution device and an air intake module for supplying these engines.

Motors can be supercharged or powered at atmospheric pressure. The gases admitted into the combustion chamber, in which a mixture of oxidant and fuel is burned to generate the work of the engine, are called intake gases.

An air intake module supplies the engine cylinders with intake gas. For this shutter, the air intake module generally comprises an intake manifold or distribution manifold, comprising a predefined number of supply ducts dedicated to the cylinders of the internal combustion engine and making it possible to distribute the flow of gas d admission to the different cylinders.

In the case of supercharged engines, the charge air is generally cooled before being introduced into the combustion chamber in order to increase the density of the charge air. This function is fulfilled by a heat exchanger, also called a charge air cooler known by the acronym "RAS".

In order to reduce polluting emissions, it is known to introduce into the air flow, so-called "recirculated" exhaust gases (known to those skilled in the art under the English abbreviation "EGR" corresponding to "Exhaust Gas recirculation "). H is exhaust gas taken downstream of the combustion chamber to be redirected (recirculated) to the intake gas flow, upstream of the combustion chamber, where they are mixed with the charge air for admission to the combustion chamber.

In the following, the term intake gas means supply air or supercharging from the engine intake system and the exhaust gases recovered at the engine outlet.

In a known buoy, the introduction of recirculated exhaust gases is carried out

-2 via a distribution rail transverse to the flow of the air flow. The distribution rail is provided with a plurality of holes allowing the arrival of recirculated exhaust gases at the level of each combustion cylinder.

Conventionally, this distribution rail is integrated into the intake manifold. However, the exhaust gases arriving at the distribution rail have a high temperature, which requires the distribution rail and the intake manifold to be made of an expensive material resistant to high temperatures, generally a metallic material.

A constant desire is to reduce costs and masses.

However, it is not possible to make the distribution rail in a less expensive material such as plastic. In addition, by making the plastic intake manifold, even with thermal decoupling, the temperature of the exhaust gases is too high and would risk seriously degrading the integrity of the plastic. In addition, the composition of the recirculated exhaust gas loaded with hydrocarbon poses significant risks of ignition.

The present invention proposes to remedy at least partially the above-mentioned drawbacks by proposing a device for distributing an air flow and a recirculated exhaust gas flow at a lower cost and reducing the risk of ignition. .

To this end, the subject of the invention is a device for distributing an air flow and a recirculated exhaust gas flow, said device being configured to be attached to the cylinder head of an internal combustion engine of motor vehicle, said device comprising:

an intake manifold configured to distribute the air flow in the cylinder head; and a rail for distributing the recirculated exhaust gas flow.

According to the invention, the intake manifold is made of plastic, and the distribution rail is made of metallic material and is integrated into the intake manifold.

Thus, a distribution rail for a flow of high pressure recirculated exhaust gas, advantageously previously cooled, can be integrated into a manifold.

-3 intake made of plastic to reduce mass and costs.

Said device may also include one or more of the following characteristics, taken separately or in combination:

the intake manifold includes means for receiving the distribution rail;

the receiving means comprises a receiving cavity of the distribution rail formed in the intake manifold;

the receiving means is configured to hold the distribution rail in the intake manifold;

the receiving means and the distribution rail are of substantially complementary shapes;

maintaining the distribution rail is achieved by the complementarity of form between the receiving means and the distribution rail;

the intake manifold is configured to be fixed on the cylinder head, so as to maintain the distribution rail sandwiched between the intake manifold and the cylinder head;

said device comprises a thermal insulator arranged between the distribution rail and the means for receiving the distribution rail;

the outer wall of the distribution rail and the inner wall of the receiving cavity in the intake manifold are separated by an air knife ensuring the function of thermal insulation;

the distribution rail extends substantially transversely relative to the direction of flow of the air flow at the outlet of the intake manifold;

the distribution rail is arranged so as to open out from the intake manifold. Thus, the flow of exhaust gas leaving the distribution rail does not risk coming into contact with and therefore damaging the plastic of the intake manifold;

the intake manifold does not have a chamber for mixing the air flow and the recirculated exhaust gas flow;

the distribution rail has an open outlet face configured to interface with the cylinder head. Thus, the distribution rail is intended to be open on the cylinder head face, which makes it possible to have a "cold" face on which the flow of

-4 hot exhaust gas can be introduced, further limiting the risk of thermal degradation of the plastic intake manifold;

the distribution rail has an opening for introducing the recirculated exhaust gas flow and at least one conduit for routing the flow of recirculated exhaust gas from the introduction opening to the outlet face of the distribution rail ;

the distribution rail comprises at least one deflector arranged in said at least one duct for conveying the recirculated exhaust gas flow, so as to distribute the flow of recirculated exhaust gas over the entire length of the distribution rail;

the distribution rail comprises at least one partition forming a deflector, arranged so as to separate the conveying conduit into at least one inlet channel communicating with the introduction orifice and an outlet channel configured to lead to the cylinder head of said engine;

said at least one partition extends substantially transversely relative to the direction of flow of the air flow at the outlet of the intake manifold;

the partition extends over a length less than the length of the distribution rail; the partition extends substantially over half the length) of the distribution rail; the distribution rail comprises a passage from the inlet channel to the outlet channel and at least one deflector arranged in this passage, so as to distribute the flow of exhaust gas from the introduction orifice over the entire length of the outlet channel;

the passage from the inlet channel to the outlet channel is arranged substantially in the middle of the outlet channel.

The invention also relates to an air intake module for an internal combustion engine configured to be fixed to the cylinder head of the internal combustion engine. According to the invention, the air intake module comprises a device for distributing an air flow and a recirculated exhaust gas flow as defined above.

According to one aspect of the invention, the air intake module comprises a heat exchanger arranged upstream of the intake manifold in the direction

-5 air flow and configured to cool the air flow.

The invention also relates to an internal combustion engine for a motor vehicle comprising a cylinder head, on which an air intake module as defined above is fixed.

According to one aspect of the invention, the cylinder head has a duct for mixing the air flow and the exhaust gas flow.

Other characteristics and advantages of the invention will appear more clearly on reading the following description, given by way of illustrative and nonlimiting example, and of the appended drawings among which:

FIG. 1 is a perspective view of an air intake module attached to the cylinder head of an internal combustion engine and comprising a distribution device according to the invention,

FIG. 2 is another perspective view of the air intake module of FIG. 1 showing an exploded view of the distribution device comprising an intake manifold and a distribution rail,

FIG. 3 is a view after assembly of the dispensing device of FIG. 2,

FIG. 4 is a cross-sectional view of FIG. 1,

FIG. 5 is a partially sectional view schematically showing the distribution device connected to the cylinder head,

FIG. 6 is a perspective view of the distribution rail of the distribution device,

FIG. 7 is a sectional view of the distribution rail of FIG. 6 along a plane P,

FIG. 8 is a partial view showing a lateral end of the intake manifold integrating the distribution rail,

FIG. 9 is a perspective view in section of the intake manifold integrating the distribution rail, and

FIG. 10 is an enlarged view of the perspective view of FIG. 9.

In these figures, identical elements have the same references.

The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference relates to the same embodiment, or that the characteristics

-6 apply only to a single embodiment. Simple features of different embodiments can also be combined or interchanged to provide other embodiments.

In the description, it is possible to index certain elements, such as for example first element or second element. In this case, it is a simple indexing to differentiate and name similar but not identical elements. This indexing does not imply a priority of one element over another and one can easily interchange such names without departing from the scope of this description. This indexing does not imply an order in time either.

FIGS. 1 to 3 show an air intake module 1 for an internal combustion engine of a motor vehicle comprising in particular a cylinder head 3, partially visible in FIGS. 1 and 4, and a predefined number of cylinders ( not shown).

The air intake module 1 is intended to be placed and fixed on the cylinder head 3 of the internal combustion engine.

This air intake module 1 is configured to supply the cylinders (not shown) with intake gas, that is to say supply air, or charge air, and exhaust gases. recovered at engine output, in accordance with a process generally known by the acronym EGR for "Exhaust Gas Recirculation" in English.

To do this, the air intake module 1 comprises a device 5 for distributing an air flow and a recirculated exhaust gas flow.

Subsequently, the terms "upstream" and "downstream" are defined in relation to the direction of flow of the feed or charge air flow in the distribution device 5.

According to the exemplary embodiments illustrated in FIGS. 1 to 3, the air intake module 1 also includes an inlet manifold 7 supplied with supply or charge air, by an intake system not shown in the figures.

The internal combustion engine can in particular be a supercharged engine, that is to say supplied with air from a turbocharger. In this case, in order

To increase the density of the intake air, it is known to cool the charge air by means of a heat exchanger 9 of the air intake module 1. This heat exchanger 9 is generally called cooler charge air also known by the acronym "RAS".

The invention relates more particularly to the dispensing device 5.

According to the embodiment described, the distribution device 5 is configured to be attached to the cylinder head 3 of an internal combustion engine of a motor vehicle (see Figures 1 and 4).

Referring to Figures 2 to 4, the distribution device 5 comprises an intake manifold 11 for the air flow and a distribution rail 13 for recirculated exhaust gases.

Distribution rail 13 is integrated into the IL intake manifold

By "integrated" is meant the intake manifold 11, the fact that the intake manifold 11 and the distribution rail 13 form an integral or unitary assembly. The term “integrated” is not limited here to the arrangement of the distribution rail 13 inside the intake manifold IL It can be envisaged that the distribution rail 13 is received inside the intake manifold 11 or conversely received in a portion of the intake manifold 11 which does not cover the distribution rail 13 or also fixed to a wall of the intake manifold 11 by any suitable means, whether on the top, the bottom or on one side of the IL intake manifold

In addition, according to the illustrated embodiment, the distribution rail 13 can be integrated into the intake manifold 11 without the intermediary of thermal decoupling means.

The intake manifold 11, also known as a distribution manifold or even a distributor, is configured to distribute the flow of feed or charge air into the cylinder head 3 (see FIG. 4). The intake manifold 11 is therefore intended to be traversed by the feed or supercharging air flow.

In the description, reference is made to an intake manifold 11 for an internal combustion engine. Of course, the invention applies to any gas distribution part.

-8The intake manifold 11 is intended to be mounted on the cylinder head 3. Any suitable fixing means can be used. The fixing means which allow the intake manifold 11 and the cylinder head 3 to be fixed together are well known and will not be described in more detail herein.

According to the embodiment described, the intake manifold 11 allows a distributed intake, in the cylinder head 3, of the air flow. However, the intake manifold 11 does not allow the admission of a mixture of the feed or charge air flow and the recirculated exhaust gas flow. In other words, the intake manifold 11 does not receive the recirculated exhaust gas flow and has no chamber for mixing the air flow and the recirculated exhaust gas flow. Such a mixture is produced at the cylinder head 3 of the engine.

The intake manifold 11 comprises a predefined number of supply conduits 15 dedicated to each cylinder of the internal combustion engine and making it possible to distribute the air flow in the different cylinders (not shown). The intake manifold 11 therefore comprises as many supply conduits 15 as the internal combustion engine associated with cylinders (not shown). The supply conduits 15 of the intake manifold 11 are arranged so as to communicate each with a cylinder and are for example intended to extend into the cylinder head 3. In other words, the supply conduits 15 of the intake manifold 11 are intended to be in fluid communication with complementary air conduits 17 of the cylinder head 3. These complementary air conduits 17 each open into a combustion chamber (not shown in the figures) of a cylinder. The intake manifold 11 therefore has a downstream part, designated by the reference Ii in FIGS. 2 to 4, intended to form an interface with the cylinder head 3, when the distribution device 5 is assembled on the cylinder head 3 of the combustion engine. internal.

The heat exchanger 9, such as a charge air cooler (RAS), can be arranged upstream of the intake manifold 11 according to the direction of flow of the air flow, and is therefore crossed by the flow of air before the intake manifold 11. The intake manifold 11 therefore also has in this example an upstream part forming an interface with the heat exchanger 9, designated by the reference I ₂ in FIG. 4.

According to the example illustrated in FIGS. 1 to 3, the air flow, for example, from

-9 supercharging is therefore introduced into the heat exchanger 9 through the inlet manifold 7, mounted upstream of the heat exchanger 9, and discharged through the intake manifold 11, mounted downstream of the heat exchanger 9 and intended to be connected to the cylinder head 3 of the internal combustion engine.

According to an alternative, not shown, the heat exchanger 9 can have the particularity of being integrated into the function of the intake manifold 11, in which case the heat exchanger 9 would then be fixed directly to the cylinder head 3.

Furthermore, according to a particular embodiment, the intake manifold 11 is made of plastic. As an example of a non-limiting plastic, mention may be made of polyamide, and in particular of polyamide reinforced with glass fibers, in particular known under the name PA66-GF50.

In addition, the intake manifold 11 includes means for receiving the distribution rail 13.

The receiving means may include a housing. According to the example illustrated, the housing is produced by a receiving cavity 19 of the distribution rail 13 formed in the intake manifold 11 (see Figures 2 and 5).

This receiving cavity 19 is formed in the intake manifold 11, on the downstream part Ij.

In particular, the receiving cavity 19 extends in the direction of the width of the intake manifold Π. In other words, in this example, the receiving cavity 19 extends substantially transversely relative to the general direction of flow of the air flow leaving the intake manifold 11, shown diagrammatically by the arrow F in FIGS. 2 to 4.

According to an alternative not illustrated, one can envisage a receiving means which is not arranged inside the intake manifold 11. By way of nonlimiting example, an external wall of the intake manifold 11 may have means fixing the distribution rail 13.

In the following description, reference is made to the receiving cavity 19 (Figures 2 and 5). Of course, the invention is not limited to such a receiving cavity 19 to perform the receiving function of the distribution rail 13. The following description can be applied to other embodiments of the receiving means.

Preferably, the receiving cavity 19 and the distribution rail 13 are of

-10 substantially complementary forms.

Advantageously, the receiving cavity 19 is configured to maintain or block the distribution rail 13 in the intake manifold 11. In particular, the maintenance or blocking of the distribution rail 13 is in this example achieved by the form complementarity between the receiving cavity 19 and the distribution rail 13.

More precisely, according to the example illustrated in FIG. 4, the intake manifold 11 is configured to be fixed on the cylinder head 3, so as to block the distribution rail 13 against the cylinder head 3. The distribution rail 13 is therefore sandwiched between the intake manifold 11 and the cylinder head 3. This produces a blocking, along the three axes, of the distribution rail 13 in the intake manifold 11 and against the cylinder head 3.

Thus, the distribution rail 13 can be mechanically mounted in the intake manifold 11. With reference to FIG. 2, the distribution rail 13 is inserted into the receiving cavity 19 provided for this purpose in the intake manifold 11 The assembly can then be attached and fixed to the cylinder head 3 of the internal combustion engine ensuring the blocking or retaining of the distribution rail 13 between the intake manifold 11 and the cylinder head 3.

In addition, provision can be made for the distribution device 5 to include a thermal insulator arranged between the distribution rail 13 and the means for receiving the distribution rail 13. Advantageously, this function of thermal insulation or heat shield is achieved by the presence of an air layer or air gap between the outer wall of the distribution rail 13 and the inner wall of the receiving cavity 19. This air gap is for example of the order of a millimeter.

Finally, the intake manifold 11, and in particular the reception means such as the reception cavity 19, can be produced or shaped so that when the distribution device 5 is assembled on the cylinder head 3, the distribution rail 19 integrated or mounted on the intake manifold 11, or substantially inclined downwards with reference to the arrangement of the elements in FIG. 4. Such an arrangement makes it easier to inject into the cylinder head 3.

The distribution rail 13 can itself be made of metallic material.

As said before, this distribution rail 13 is integrated into the collector

-11cT intake 11. Whether integrated in a receiving cavity 19 in the intake manifold 11 (see Figures 2 and 5), or that it is, according to an alternative not illustrated, carried by an outer wall of the manifold intake 11, the distribution rail 13 is arranged on the downstream part Zy of the intake manifold 11 intended to form an interface with the cylinder head 3 of the internal combustion engine, as is better visible in FIG. 4.

In the example illustrated, the distribution rail 13 is positioned above the supply conduits 15, with reference to the arrangement of the elements in FIGS. 3 and 4.

In addition, the distribution rail 13 extends substantially transversely with respect to the general direction of flow of the air flow, shown diagrammatically by the arrow F in FIGS. 2 to 4, at the outlet of the intake manifold 11.

The distribution rail 13 can extend longitudinally over a large part of the width of the intake manifold 11.

According to a particular embodiment, better visible in FIGS. 3 and 4, the distribution rail 13 is arranged so as to lead to the outside of the intake manifold 11. Thus, the flow of recirculated exhaust gases does not enter not in contact with the plastic material of the intake manifold 11. This authorizes the manufacture of the supply conduits 15, not traversed by the flow of recirculated exhaust gases, and more generally of the intake manifold 11, made of a material , like plastic, less heat resistant and therefore less expensive to produce.

More specifically, according to the illustrated embodiment, the distribution rail 13 has an open outlet face 21 configured to lead to the cylinder head 3, when the distribution device 5 is assembled on the cylinder head 3 of the engine. The open outlet face 21 allows the injection of the recirculated exhaust gas flow, called EGR, not into the air flow upstream of the cylinder head, but directly into the cylinder head 3 of the engine. The flow of the recirculated exhaust gas flow is shown diagrammatically by the arrows F ’in FIGS. 4 and 5.

According to the example illustrated, the cylinder head 3 has additional conduits 22 communicating with the outlet face 21 of the distribution rail 13 when the distribution device 5 is assembled on the cylinder head 3. In addition, these additional conduits 22 can open into the air ducts 17 of the cylinder head 3 (see FIG. 4), so

-12allow the air flow and the recirculated exhaust gas flow to be mixed. Each air duct 17 is then provided for such a mixture.

The distribution rail 13 extends longitudinally so as to be vis-à-vis all of the additional conduits 22 of the cylinder head 3. The distribution rail 13 here extends over a large part of the width of the manifold d admission 11.

In operation, the flow of exhaust gas is distributed to all of the cylinders of the internal combustion engine (not shown) thanks to the opening of the outlet face 21 over the entire length L of the distribution rail 13 (see figure 6).

As said previously, the distribution rail 13 once mounted on the cylinder head 3 as shown in FIG. 4, is inclined downwards with reference to the arrangement of the elements in FIG. 4.

Furthermore, in order to allow the introduction of the flow of recirculated exhaust gases into the distribution rail 13, the latter comprises at least one introduction orifice 23, here a single introduction orifice 23, of the gas flow recirculated exhaust. This introduction orifice 23 is intended to be in fluid communication with a recirculated exhaust gas supply system, not shown. The high-pressure recirculated exhaust gas flow is advantageously cooled before being introduced into the distribution rail 13.

With reference to FIGS. 6 to 9, the distribution rail 13 may have substantially rounded edges at the level of its lateral ends and of the introduction orifice 23.

The distribution rail 13 also includes at least one conduit 25 for the flow of exhaust gas recirculated from the introduction orifice 23 to the outlet face 21 of the distribution rail 13, as is better visible in the figure. 7. In this FIG. 7, the flow of the exhaust gas flow is shown diagrammatically by the arrows F ′.

The distribution rail 13 is shaped so as to optimize the flow of the recirculated exhaust gas flow, reducing the risk of ignition of the plastic of the intake manifold 11, by hydrocarbons.

Preferably, the distribution rail 13 comprises at least one deflector 27, 29 arranged in the conduit 25 for the flow of recirculated exhaust gas, so as to distribute the flow of recirculated exhaust gas over the entire length L rail

-13distribution 13.

In the example illustrated, the routing conduit 25 is separated into at least one inlet channel 31 communicating with the introduction orifice 23 and an outlet channel 33 configured to lead to the cylinder head 3 of the internal combustion engine (not visible in Figure 7).

To do this, the distribution rail 13 comprises at least one partition 27 forming a deflector arranged so as to separate the conveying duct 25.

The partition 27 extends substantially transversely relative to the direction of flow of the air flow at the outlet of the intake manifold 11 (not visible in FIG. 7).

This is a substantially straight partition 27. More specifically, the partition 27 has a substantially rectangular and planar shape.

In this example, the partition 27 does not extend over the entire length L of the distribution rail 13. This partition 27 therefore does not extend over the entire width of the intake manifold 11. H results that the channel d the inlet 31 extends over a length less than the length of the outlet channel 33, corresponding to the total length L of the distribution rail 13.

According to the example illustrated, the partition 27 extends over a length less than or equal to half the length L of the distribution rail 13. In this case, the inlet channel 31 extends over a length of the order of or less than half the length L of the outlet channel 33.

The inlet channel 31 and the outlet channel 33 extend substantially parallel. The inlet 31 and outlet 33 channels extend respectively transversely to the direction of flow of the air flow at the outlet of the intake manifold 11 (not visible in FIG. 7).

In particular, the distribution rail 13 has a first part in which the inlet channel 31 and the outlet channel 33 extend in parallel, and a second part thinned relative to the first part in which only the outlet channel 33. This gives the distribution rail 13 a generally substantially rectangular shape thinned on one part.

To do this, according to the example illustrated, the distribution rail 13 comprises a bottom wall 34 having a first section 341, a second section 342 as well

-14 that an intermediate section 343 connecting the first and second sections 341 and 342.

The first section 341 participates, with the partition 27, in the delimitation of the inlet channel 31. In this example, the first section 341 extends substantially parallel to the partition 27. The second section 342 delimits the outlet channel 33 in the second part of the distribution rail 13. The second section 342 of the bottom wall 34 extends in the extension of the partition 27, without being attached to the partition 27. In addition, the intermediate section 343 can be extend substantially at an angle to the first and second sections 341, 342. During the flow of the exhaust gas flow, the bottom wall 34 guides part of the exhaust gas flow, which contributes to the distribution of the exhaust gas flow over the entire length L of the distribution rail 13.

The distribution rail 13 further comprises a passage 35 from the inlet channel 31 to the outlet channel 33. The passage 35 from the inlet channel 31 to the outlet channel 33 is in the example arranged substantially in the middle of the channel outlet 33. This passage 35 is therefore arranged between the partition 27 and the bottom wall 34.

Advantageously, the distribution rail 13 comprises at least one deflector 29 arranged in this passage 35, so as to distribute the flow of exhaust gas coming from the introduction orifice 23 over the entire length L of the outlet channel 33 .

In passage 35, the distribution rail 13 may include one or more tabs 29, forming a deflector. In the example illustrated in Figures 7, 9 and 10, a tongue 29, here substantially curved, is arranged in the passage 35 so as to separate in two the flow of exhaust gas from the introduction orifice 23. This tongue 29 extends generally transversely with respect to the partition 27 separating the inlet channel 31 and the outlet channel 33. The tongue 29 is for example formed substantially in the middle of the passage 35.

Finally, as is better visible in FIGS. 3 and 8 to 10, the distribution device 5 may include a seal 37 on the downstream part Ii of the intake manifold 11 intended to form an interface with the cylinder head 3 (not visible in Figures 3 and 8 to 10). The seal 37 is arranged on the one hand around the supply conduits 15, and on the other hand between the receiving cavity 19 and the distribution rail

13. In the example illustrated, the seal 37 is arranged by following the contour of the

-15 bottom of the supply orifices 15 and the contour of the top of the distribution rail 13, with reference to the arrangement of the elements in FIG.

Thus, the air flow, for example of supercharging, when it leaves the heat exchanger 9, continues its race through the intake manifold 11 then in the cylinder head 3 downstream of the distribution device 5. The flow exhaust gas flows through the distribution rail 13 and is then distributed in the cylinder head 3, advantageously without flowing through the intake manifold 11. Downstream of the distribution device 5, more precisely in the cylinder head 3, the air flow, for example of supercharging, mixes with the flow of EGR exhaust gas. The mixture of gases finally reaches the cylinders of the internal combustion engine.

With a distribution device 5 as described above, the intake manifold 11 can be made of plastic material and integrate the distribution rail 13 which can in turn be metallic in order to withstand the temperatures of the exhaust gases.

Indeed, the arrangement of the distribution rail 13 opening to the outside of the intake manifold 11, allows the manufacture of the latter in a less heat-resistant and less expensive material such as plastic, while reducing the risk to burn the plastic.

In addition, the arrangement of the distribution rail 13 in a receiving cavity, 19 of the intake manifold 11, allows a gain in bulk.

Finally, the distribution rail 13 open on its outlet face 21 opposite the cylinder head 3, makes it possible to have a “cold” face on which the recirculated exhaust gases known as hot EGR can be introduced, limiting the risk of thermal degradation of the plastic intake manifold 11.

Claims (15)

1. Distribution device (5) for an air flow and a recirculated exhaust gas flow, said device (5) being configured to be attached to the cylinder head (3) of an internal combustion engine motor vehicle, said device (5) comprising: an intake manifold (11) configured to distribute the air flow in the cylinder head (3), and a distribution rail (13) for the recirculated exhaust gas flow, characterized in that: the intake manifold (11) is made of plastic, and in that the distribution rail (13) is made of metallic material and is integrated into the intake manifold (11). 2. Device according to the preceding claim, wherein the intake manifold (11) comprises means for receiving the distribution rail (13). 3. Device according to the preceding claim, wherein the receiving means comprises a receiving cavity (19) of the distribution rail (13) formed in the intake manifold (11). 4. Device according to one of claims 2 or 3, wherein the receiving means is configured to maintain the distribution rail (13) in the intake manifold (11). 5. Device according to one of claims 2 to 4, wherein the receiving means and the distribution rail (13) are of substantially complementary shapes. 6. Device according to any one of claims 3 to 5, wherein the intake manifold (11) is configured to be fixed on the cylinder head (3), so as to maintain the distribution rail (13) sandwiched between the intake manifold (11) and the cylinder head (3). 7. Device according to any one of claims 2 to 6, comprising a thermal insulator arranged between the distribution rail (13) and the receiving means of the distribution rail (13). 8. Device according to any one of the preceding claims, in which the distribution rail (13) extends substantially transversely with respect to the direction of flow (F) of the air flow leaving the intake manifold ( 11). 9. Device according to any one of the preceding claims, in which the distribution rail (13) is arranged so as to open out on the outside of the intake manifold (11). 10. Device according to the preceding claim, wherein the distribution rail (13) has an open outlet face (21) configured to interface with the cylinder head (3). 11. Device according to the preceding claim, in which the distribution rail (13) comprises an introduction orifice (23) for the flow of recirculated exhaust gases and at least one routing conduit (25) for the flow of gas d exhaust recirculated from the introduction orifice (23) to the outlet face (21) of the distribution rail (13). 12. Device according to the preceding claim, in which the distribution rail (13) comprises at least one deflector (27, 29) arranged in said at least one routing conduit (25) of the recirculated exhaust gas flow, so distributing the recirculated exhaust gas flow over the entire length (L) of the distribution rail (13). 13. Device according to the preceding claim, in which the distribution rail (13) comprises at least one partition (27) forming a deflector, arranged so as to separate the conveying conduit (25) into at least one inlet channel ( 31) communicating with the introduction orifice (23) and an outlet channel (33) configured to lead to the cylinder head (3) of said engine. 14. Device according to the preceding claim, wherein the distribution rail (13) comprises a passage (35) from the inlet channel (31) to the outlet channel (33) and at least one deflector (29) arranged in this passage (35), so as to distribute the flow of exhaust gas from the introduction orifice (23) over the entire length of the outlet channel (33). 15. Air intake module (1) for internal combustion engine configured to be -18fixed to the cylinder head (3) of the internal combustion engine, characterized in that it comprises a distribution device (5) of an air flow and a flow of recirculated exhaust gases according to one any of the preceding claims. 1/4 F 3/4 L 4/4