Dosing module for dosing operation / auxiliary materials

Abstract

The invention relates to a metering module (10) for metering an operating / auxiliary substance into an exhaust gas flow (46) that flows through the exhaust system (42) of an internal combustion engine. The metering module (10) is cooled by means of a cooling medium. At least one heat pipe (56, 96) extends between a heat exchanger (50, 110) through which the cooling medium flows from an inlet side (52) to an outlet side (54) and a metering valve (18), said heat pipe causing a heat flow (68) from the metering valve (18) to the heat exchanger (50, 110).

Description

Technical Field

[0001] The present invention relates to a metering module for metering an operating / auxiliary substance into an exhaust gas flow that flows through the exhaust system of an internal combustion engine, wherein the metering module is cooled by means of a coolant. The invention also relates to the use of a metering module in the exhaust system of an internal combustion engine for metering an operating / auxiliary substance, in particular a urea-water solution, into the exhaust gas flow of an internal combustion engine of a passenger car or commercial vehicle. Background Art

[0002] US2016 / 0326925 A1 relates to a metering module with integrated heat pipes. The metering module for an exhaust gas aftertreatment system includes a mounting flange for coupling to the exhaust system. The mounting flange houses a heat pipe system with a cavity in which a fluid is stored. The cavity is thermally coupled to a heat source section via a section of the mounting flange; in addition, a heat sink is thermally coupled to the cooling system. The fluid transfers heat from the heat source to the heat sink.

[0003] Current exhaust gas aftertreatment systems use metering modules, which typically include an electric metering valve and a metering valve housing, as well as guide plates for guiding the coolant. These metering modules are directly connected to the exhaust system, typically using screw-on flanges. Due to required standardization measures, this connection only allows for certain dimensions for the screw-on flanges. This, in turn, significantly impacts the internal design of the metering valve housing, which in turn can affect the position and location of the guide plates previously used for the external coolant. Summary of the Invention

[0004] According to the present invention, a metering module is provided for metering an operating / auxiliary substance into an exhaust gas flow, the exhaust gas flow flowing through the exhaust system of an internal combustion engine, and the metering module is cooled by means of a coolant. At least one heat pipe extends between a heat exchanger, through which the coolant flows from the inlet side to the outlet side, and a metering valve, and causes a heat flow from the metering valve toward the heat exchanger.

[0005] In a configuration variant of the metering module proposed according to the invention, at least one heat pipe is designed in the form of a pot with or without a honeycomb structure, or in the form of individual pipes distributed in the circumferential direction.

[0006] In a further development of the solution proposed according to the invention, the evaporation region of at least one heat pipe is arranged at the end of the metering valve facing the exhaust system, and the condensation region of at least one heat pipe is arranged within the heat exchanger. In the metering module proposed according to the invention, at least one heat pipe can be cylindrical and / or include bent end regions and / or it is possible to design at least one heat pipe such that it has an enlarged transfer surface.

[0007] In the dosing module proposed according to the invention, at least one heat pipe extends through a cavity of the dosing module housing, which cavity contains only air. Advantageously, the at least one heat pipe extends along the dosing valve at a shielding distance.

[0008] In the metering module proposed according to the invention, a plurality of heat pipes can be accommodated in the heat exchanger, which heat pipes have a cylindrical shape and are axially offset relative to one another and are oriented perpendicularly to the flow direction of the coolant flowing through the heat exchanger.

[0009] In one embodiment of the metering module according to the present invention, multiple heat pipes are held in a cooling body, which can be embodied as a multi-piece body. This cooling body comprises a first cooling body part and a second cooling body part, which are clamped relative to each other along a dividing surface. Furthermore, the cooling body can have one or more widenings on one or both end sides. These widenings serve, in particular, to increase the heat dissipation surface, thereby achieving improved heat transfer.

[0010] According to the solution proposed by the invention, a plurality of heat pipes can further be accommodated on the cooling body, wherein the individual heat pipes are arranged rotated relative to one another by an orientation angle α. This allows a significant increase in the heat exchange surface and thus an improved heat flow.

[0011] According to the solution proposed by the present invention, the positioning angle α can further be oriented in a range between 20° and 80° relative to the flow direction of the coolant.

[0012] A heat sink which can be constructed in multiple parts and in particular has a first heat sink part and a second heat sink part offers the possibility of clamping at least one heat pipe which may be cylindrical and / or may have a bent end region in the region of the interface between the two heat sink parts.

[0013] In an alternative embodiment of the dosing module proposed according to the invention, the dosing module can comprise a heat exchanger integrated into the dosing module housing, which allows for a very compact design while requiring minimal installation space.

[0014] In an alternative embodiment of the metering module proposed according to the invention, the discrete tubes are arranged spaced apart from one another in the circumferential direction of the metering valve.

[0015] In an alternative embodiment of the metering module proposed according to the invention, the first heat pipe section and the second heat pipe section are arranged opposite one another on the metering valve.

[0016] In an alternative embodiment of the metering module proposed according to the invention, a honeycomb structure is implemented in the pot-shaped heat pipe, which, viewed in the circumferential direction, comprises 1 . . . to n mutually separated chambers.

[0017] In an alternative embodiment of the metering module proposed according to the invention, a pot-shaped heat pipe having a honeycomb structure is surrounded by a cylindrical heat exchange region in the condensation region.

[0018] Finally, the invention relates to the use of a dosing module in the exhaust system of an internal combustion engine for dosing an operating / auxiliary substance, in particular a urea-water solution, into the exhaust gas flow of an internal combustion engine, which may be a passenger car or a commercial vehicle.

[0019] The solution proposed according to the invention achieves this by attaching the heat pipe directly to the electrically actuated metering module housed in the metering module housing and by pressing two cooling element elements of equal surface area and mass together: heat can be transferred via the at least one heat pipe with a relatively small temperature difference. This means that heat can be quickly dissipated from the metering module tip located in the exhaust system, which is subject to high temperature loads, toward the heat exchanger. The generated heat can thus be directly transported without overheating the electrically actuated metering valve housed in the metering module housing.

[0020] Furthermore, a larger coolant cross-section can be achieved, making available a heat capacity that provides a large heat absorption capacity. Furthermore, rapid heat transport can be achieved by the coolant and its large volume flow. Furthermore, a relatively geometrically robust coolant connection to the heat exchanger associated with the metering module can be achieved. The material-locking connection achieved by welding in thin wall thicknesses, which is very prone to errors and can lead to sealing problems, can be completely omitted in prior art solutions.

[0021] Furthermore, the solution proposed according to the invention offers the possibility of a flexible selection of the connection area, ie either a clamping contact or a connection via a quick connector or the like.

[0022] Furthermore, the solution proposed according to the invention offers the possibility of flexibly selecting the heat exchange area by geometrically selecting the corresponding contact surfaces. This allows the solution proposed according to the invention to be used not only in passenger cars but also in commercial vehicles. It also allows for significantly different flow rates of the cooling medium and, therefore, the achievable heat input. Compared to previously known solutions from the prior art, the metering module proposed according to the invention can also be used under high vibration accelerations.

[0023] In addition, in terms of service life and sealing, it is advantageously possible to ensure that the heat pipe is firmly attached to the pipeline where the cooling medium flows. Because the heat pipe used is constructed as a hollow body, the weight of the metering module proposed according to the present invention is greatly affected. In terms of the material selection of the heat pipe to be used, it can be proposed that these heat pipes can be made of, for example, stainless steel, copper, brass, plastic or a combination of these materials, depending on the application area. Compared to the guide plates used so far, simplified manufacturing is obtained when the cooling function is integrated into the housing of the metering module.

[0024] The increased distance between the heat input, in this case the tip of the metering module, and the heat output, in this case from the top of the metering module, compared to solutions according to the prior art has the advantage that the coolant only comes into contact within the heat exchanger. In contrast, in solutions according to the prior art, the coolant is already heated on its way to the metering valve tip, so that the amount of heat to be dissipated is reduced due to the temperature difference between the coolants, since the coolant temperature at the coolant tip is lower than the temperature difference in the heat exchanger. This improves the cooling performance of the solution proposed according to the invention. Advantageously, if insufficient installation space is available for the heat exchanger outside the housing, the heat exchanger can be relocated into the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described in detail below with reference to the accompanying drawings.

[0026] Figure 1 Dosing modules used hitherto have guide plates incorporated into the housing of the dosing module;

[0027] Figure 2 according to Figure 1 The metering module shown in FIG is attached to the schematically shown exhaust system; Figure 3 A longitudinal section through a metering module according to the invention having at least one heat pipe and a heat exchanger;

[0028] Figures 4.1 to 4.4 Different geometries of heat pipes;

[0029] Figure 5 Possible arrangements of heat pipes within the heat exchanger;

[0030] Figure 6 Heat pipes of different structural types are accommodated in a cooling body constructed in multiple parts;

[0031] Figure 7 exist Figure 6 A top view of a schematically illustrated multi-part cooling body with heat pipes accommodated therein,

[0032] Figure 8Schematic representation of a heat exchanger in which heat pipes with enlarged transfer surfaces are arranged,

[0033] Figure 9 An embodiment variant of the metering valve according to the invention with an integrated heat exchanger,

[0034] Figure 10 and 10.1 Heat pipes arranged as discrete pipes distributed in the circumferential direction around the metering valve,

[0035] Figure 11 ,11.1 The arrangement in which the metering valve is surrounded by two heat pipes surrounding the metering valve,

[0036] Figure 12 The honeycomb structure inside the can-shaped heat pipe, and

[0037] Figure 13 Have basis Figure 12 A pot-shaped heat pipe with a built-in honeycomb structure and a cylindrical heat exchange area surrounding the pot-shaped heat pipe.

[0038] In the following description of embodiments of the present invention, identical or similar elements are denoted by identical reference numerals, wherein a repeated description of these elements is omitted in individual cases. The drawings merely schematically illustrate the content of the present invention. DETAILED DESCRIPTION

[0039] Figure 1 The dosing module 10 is shown, in whose dosing module housing 12 a cavity 14 is formed. A dosing valve 18 is located in the cavity 14, which is bounded by a housing wall 16 of the dosing module housing 12. The dosing valve 18 is electrically actuated via an electrical connection 20. The dosing module housing 12 has an inlet 22 for a cooling medium and an outlet 24 for the cooling medium. In addition, an inlet 26 for an operating / auxiliary material, which is typically a freezable urea-water solution, is provided on the dosing module housing 12. Figure 1 , a first guide plate 28 and a second guide plate 30 are located in the cavity 14 of the dosing module 10 .

[0040] according to Figure 1 The dosing module housing 12 of the dosing module 10 is connected to the dosing module housing 12 by Figure 1 The fixing flange 32 schematically shown in FIG. Figure 1 The exhaust system of the internal combustion engine (not shown) is connected.

[0041] Figure 2 Shown, according to Figure 1The dosing module housing 12 of the dosing module 10 is connected via a fastening flange 32 to a lateral branching pipe of an exhaust system 42. An exhaust gas flow 46 generated by an internal combustion engine of a passenger car or commercial vehicle flows through the exhaust system 42. The dosing module housing 12 comprises an inlet 34 for operating / auxiliary material, a hose 36 for the coolant on the inflow side, and a hose 38 for the coolant on the return side. In addition, according to Figure 2 , an electrical connection 40 is present on the dosing module housing 12 of the dosing module 10 .

[0042] Typically, the metering module housing 12 of the metering module 10 is screwed to the exhaust system 42 via a fastening flange 32 , for example.

[0043] Figure 3 The longitudinal section of the metering module 10 according to the invention is shown, which comprises a heat exchanger 50 through which a cooling medium flows from the inlet side 52 in the direction of the outlet side 54. Within the heat exchanger 50 on the upper side of the metering module 10 there is a condensation region 66 of at least one heat pipe 56. Figure 3 In the longitudinal section of FIG. 5 , at least one heat pipe 56 shown there is embodied in the form of a pot 58 .

[0044] The metering valve 18 is located in the air volume 78 bounded by the housing wall 16 of the metering module housing 12. Figure 3 In the diagram of FIG, a heat flow 68 occurs in the pot-shaped heat pipe 56, which is directed from the evaporation region 64 on the "hot" end of the metering valve 18 in the direction of the condensation region 66 located in the heat exchanger 50. Figure 3 It can be seen that the condensation region 66 of the at least one heat pipe 56 is sealed by a sealing element 70 in a wall 72 of the heat exchanger 50 .

[0045] In addition, according to Figure 3 The longitudinal section also shows that the first heat pipe branch 60 and the second heat pipe branch 62 extend through the air volume 78 of the metering module housing 12 while maintaining a shielding distance 74 relative to the metering valve 18. Advantages are achieved by the shielding distance 74, which is provided, on the one hand, by the air layer between the metering module housing 12 and the at least one heat pipe 56, and, on the other hand, by the air layer between the at least one heat pipe 56 and the metering valve 18, with respect to unwanted heat input into the metering valve 18. The metering valve is insulated from the heat input by the air layer forming the shielding distance 74. Consequently, the electrically actuated metering valve 18 is only partially exposed to the high-temperature surroundings or heated coolant, namely in the connection region at the contact point 76. This minimizes heat input due to heat conduction into the electrically actuated metering valve 18 accommodated in the air volume 78 of the metering module 10.

[0046] from Figure 4.1 、 4.2 , 4.3 and 4.4 result in implementation variants of the heat pipe 56, which are related to Figure 4.1 For example, including hole 80, or as in Figure 4.2 and Figure 4.3 As shown in FIG, a toothing 82 can be provided. This keeps the coolant flow as undisturbed as possible, so that effective heat transport from these regions of the heat pipe 56 can be achieved.

[0047] Figure 4.4 A variant embodiment of a heat pipe 56 in a heat exchanger 50, which is only partially shown, is shown schematically. Figure 4.4 In the illustration of FIG. 8 , the heat pipe 56 has a bent end region 84 that provides an increased heat transfer surface 88 (see FIG. 8 ). Figure 4.4 ). The coolant flows through the heat exchanger 50 in a flow direction 86 and thus flows along the region of the bent end region 84 that extends parallel to the flow direction 86. However, the bent end region 84 extends perpendicular to the flow direction 86 of the coolant and is therefore strongly exposed to the coolant flowing in the flow direction 86, resulting in significant heat transfer.

[0048] Figure 5 A heat exchanger 50 is shown, in which a plurality of cylindrical heat pipes 56 are accommodated.

[0049] like Figure 5 As shown, a coolant flows through the heat exchanger 50 shown there, starting from the inlet side 52 in the direction of the outlet side 54. Within the cavity bounded by the heat exchanger 50, there are a plurality of heat pipes 56, which are embodied in a cylindrical shape 90. The individual heat pipes 56 embodied in a cylindrical shape 90 are shown with an axis offset 92 relative to one another and extend essentially perpendicularly to the flow direction 86, which represents the direction of the coolant from the inlet side 52 in the direction of the outlet side 54.

[0050] Figure 6 A schematic top view of a heat sink 94 constructed in multiple parts is shown. Figure 6 The multi-piece cooling body 94 schematically shown in FIG. 1 comprises a first cooling body part 102 and a second cooling body part 104. A heat pipe 56, 96 is received in each of the cooling body parts 102 and 104. Figure 6 The multi-piece cooling body 94 shown in the figure can be, for example, Figure 6 The first heat sink part 102 has a widening 112 on one end side or on both end sides.

[0051] The widening 112 , which is designed, for example, in the form of a rod, increases the heat dissipation surface of the first heat sink part 102 . The widening 112 for increasing the heat dissipation surface can be designed in any geometric shape; its purpose is to increase the heat dissipation surface on the first heat sink part 102 .

[0052] like Figure 6 As shown, in the heat sink parts 102 and 104 of the multi-part heat sink 94 , both the heat pipe 56 and the heat pipe 96 with a bend are extended.

[0053] From the basis Figure 7 The diagram shows a multi-part cooling body 94. Figure 7 The top view of the multi-part heat sink 94 shown in FIG shows that a first heat sink part 102 is connected to a second heat sink part 104 along a dividing surface 100 which extends vertically here. The two heat sink parts 102, 104 of the multi-part heat sink 94 are connected at an introduction point 106, where a pressing force can be introduced, for example, by screwing, so that, with a correspondingly configured opening in the region of the dividing surface 100, a heat pipe 96 having a bend can be clamped, for example, in the region of the dividing surface 100. Furthermore, a widening portion shown vertically in the drawing plane is indicated by reference numeral 112. The individual widening portions 112, which can be arranged in any desired distribution on the first heat sink part 102, but also on the second heat sink part 104, achieve an enlarged transfer surface 108, so that a greater amount of heat can be absorbed from the heat sink part 102 or 104.

[0054] In the region of the interface 100 between the first cooling body part 102 and the second cooling body part 104, an opening configured to be complementary to the shape of the heat pipe clamps the heat pipe 96 with the bend, while further Figure 7 The top view shows that, for example, on the second cooling body part, the heat pipes 96 with bends can be arranged at different orientation angles α relative to each other. The orientation of the individual heat pipes 96 with bends can significantly increase the heat exchange surface, because the surface of each heat pipe 96 with a bend exposed to the flow direction 86 is larger or smaller depending on the degree of the orientation angle α. Figure 6 As shown in Figure 7 The positioning angle α shown by way of example in FIG. 8 can lie in the range of 20° to 80° relative to the flow direction 86 of the coolant.

[0055] In the region of the insertion point 106, a compressive force can be achieved, for example, by screwing the two heat sink parts 102 and 104 together. When the two heat sink parts 102 and 104 are screwed together, contact is achieved along the separating surface 100, so that the clamped heat pipe 96 with the bend is held and fixed between the two heat sink parts 102 and 104 of the multi-part heat sink 94.

[0056] Figure 8 A heat exchanger 50 is schematically shown with heat pipes 56, 96 having an enlarged transfer surface 108. Similar to the previously described figures, a coolant flows through the heat exchanger 50 starting from the inlet side 52 in the direction of the outlet side 54 of the heat exchanger 50. The coolant flowing in the flow direction 86 passes through at least one heat pipe 56, 96 arranged in the cavity of the heat exchanger 50, which may have an enlarged transfer surface 108, represented, for example, by ribs, on its circumference in the region of the condensation zone 66. Flexible, selectable connections for coolant hoses may be arranged at the ends of the heat exchanger 50 on the inlet side 52 or outlet side 54, such as clamping contacts, screw connections, or threaded connections.

[0057] Figure 9 An embodiment variant of the metering module 10 according to the invention with an integrated heat exchanger 110 is shown. Figure 9 The longitudinal section shown in FIG shows that the integrated heat exchanger 110 is integrated into the metering module housing 12 or the housing wall 16 of the metering module housing. This means that the metering module 10 proposed according to the invention has a particularly low-profile implementation possibility. Figure 3 The heat exchanger 50 of the diagram, the integrated heat exchanger 110 located on the upper side of the metering module housing 12 is passed through by the cooling medium from its inlet side 52 in the direction of the outlet side 54. Figure 9 The condensation area 66 of at least one heat pipe 56 in the form of a pot 58 is provided. There is the possibility that, instead of the heat pipe 56 in the form of a pot 58, a plurality of dispersed pipes 59, 60, 61, 62 are arranged in the circumferential direction around the metering valve 18 (see Figure 10.1 ). Instead of Figure 9 In the heat pipe 56 shown in FIG. 5 , which is designed as a pot 58 , the heat pipe sections 114 , 116 can also be arranged opposite one another with respect to the metering valve 18 .

[0058] Similar to Figure 3 According to the diagram of the metering module 10 proposed according to the invention, the evaporation region 64 of the heat pipe 56 is arranged at the "hot" end of the electrically actuated metering valve 18. Figure 9 In a variant embodiment of the dosing module 10 with an integrated heat exchanger 110, the heat pipe 56 extends through the cavity 78 of the dosing module housing 12 while maintaining the shielding distance 74 to the dosing valve 18. The air contained in the air volume 78 of the dosing module housing 12 forms a thermally insulating air layer, which minimizes the heat input, in particular from the underside of the dosing module 10, i.e., the "hot" end of the dosing module 10, to the dosing valve 18 accommodated therein.

[0059] Reference numeral 76 designates the contact point where the metering valve 18 is connected to its “hot” end on the metering module 10 .

[0060] According to the aforementioned Figures 3 to 9 The heat pipe 56 or 96 shown can be cylindrical, flat, oscillating, or ultra-flat and has a significantly lower thermal resistance compared to solid objects or flowing liquids of the same size. In conjunction with a suitable fastening force, which can be applied, for example, by pressing or by a material-locking connection in the form of welding, the heat flow 68 between the object to be thermally protected, i.e., the electrically actuated metering valve 18 arranged in the cavity 78, and the heat pipe 56, 96 can be significantly increased.

[0061] By using a cooling body pressed against the condensation region 66 of the heat pipes 56 , 96 , the heat dissipation into the heat exchanger 50 or the integrated heat exchanger 110 can again be significantly increased.

[0062] Figure 10 and 10.1 An embodiment variant is shown in which a plurality of discrete heat pipes 59 , 60 , 61 , 62 are accommodated in the housing wall 16 . Figure 10 It is shown that the first discrete tube 59, the second discrete tube 60 and the third discrete tube 61 are respectively in contact with each other at the contact points 76 on the outer circumference of the metering valve 18. Figure 10 Only the evaporation region 64 located below of the discrete tubes 59, 60, 61 is shown in the illustration. Figure 10.1 , section X.1-X.1 is shown, from which it is apparent that a total of four discrete tubes 59, 60, 61, 62 are arranged at 90° along the circumference of the metering valve 18 within the housing wall 16. Depending on the spatial relationship around the metering valve 18, a greater or lesser number of discrete tubes 59, 60, 61, 62 may also be arranged in the circumferential direction around the metering valve 18. The evaporation regions 64 of the discrete tubes 59, 60, 61, 62 are located at the contact points 76, i.e., at the "hot" end of the metering valve 18.

[0063] from Figure 11 and 11.1 Another embodiment of the heat pipe is obtained. Figure 11 and 11.1 It can be seen that within the housing wall 16 of the metering module 10 , a first heat pipe section 114 and a second heat pipe section 116 are arranged opposite one another relative to the centrally arranged metering valve 18 and substantially surround the metering valve 18 . Figure 11.1 It is shown that the mutually opposite heat pipe sections 114 and 116 are located with their evaporation regions 64 at the contact point 76 on the “hot” end of the metering valve 18 .

[0064] From the basis Figure 12 and 13 The illustration shows an embodiment variant of a heat pipe 56 in the form of a pot 58, in which a honeycomb structure 118 is integrated. The honeycomb structure 118 is essentially characterized by a plurality of cavities 120 distributed in the circumferential direction. The individual cavities 120 formed in the honeycomb structure 118 in number 1 to n are separated from one another by individual wall segments 126. The inner diameter of the housing wall 16 is designated by the reference numeral 122, and the outer diameter of the housing wall is designated by the reference numeral 124. Figure 12 The honeycomb structure 118 shown enlarged in FIG. 1 is integrated, for example, into a Figure 13 58 . Heat pipe 56 is arranged so that its evaporation region 64 contacts dosing module 10 at its lower, or "hot," end, and the heat medium transfers heat to condensation region 66 . Within the cylindrical heat exchange region, the transferred heat is dissipated to the cooling medium. The cylindrical heat exchanger section is supplied with cooling medium via inlet 22 , which exits the cylindrical heat exchange region at an elevated temperature at outlet 24 . Reference numeral 68 denotes the heat flow 68 that occurs from contact point 76 toward condensation region 66 in the cylindrical heat exchange region. The cooled heat transfer medium then flows back to evaporation region 64 in the lower region of heat pipe 56 .

[0065] The invention is not limited to the exemplary embodiments described herein and the aspects highlighted herein. Rather, numerous variations are possible within the scope of the claims, which are within the capabilities of a person skilled in the art.

Claims

1. A metering module (10) for metering an operating / auxiliary substance into an exhaust gas flow (46) which flows through an exhaust system (42) of an internal combustion engine, wherein: The metering module (10) is cooled by means of a cooling medium and is characterized in that at least one heat pipe (56, 96) extends between a heat exchanger (50, 110) located on the side of the metering module (10) facing away from the exhaust gas flow (46) and through which the cooling medium flows from the inlet side (52) to the outlet side (54) and the metering valve (18), said heat pipe causing a heat flow (68) from the metering valve (18) to the heat exchanger (50, 110).

2. The dosing module (10) according to claim 1, characterized in that The at least one heat pipe (56, 96) is configured in a pot shape (58) or comprises a plurality of dispersed pipes (59, 60, 61, 62) or is composed of a first heat pipe section (114) and a second heat pipe section (116).

3. The dosing module (10) according to claim 2, characterized in that The evaporation region (64) of the at least one heat pipe (56, 96) or the plurality of dispersed pipes (59, 60, 61, 62) or the heat pipe section (114, 116) is located at the end of the metering valve (18) pointing toward the exhaust system (42), and the condensation region (66) of the at least one heat pipe (56, 96) is located within the heat exchanger (50, 110).

4. The dosing module (10) according to claim 1, characterized in that The at least one heat pipe (56, 96) is embodied in a cylindrical shape (90) and / or comprises a bent end region (84), and / or the at least one heat pipe (56, 96) has an enlarged transfer surface (108).

5. The dosing module (10) according to claim 1, characterized in that The at least one heat pipe (56, 96) extends through a cavity (78) of a dosing module housing (12).

6. The dosing module (10) according to claim 5, characterized in that The at least one heat pipe (56, 96) extends at a shielding distance (74) from the metering module (10).

7. The dosing module (10) according to claim 1, characterized in that A plurality of heat pipes (56, 96) having a cylindrical shape (90) are received in the heat exchanger (50, 110), the heat pipes having an axial offset (92) relative to one another and being oriented perpendicular to the flow direction (86) of the cooling medium.

8. The dosing module (10) according to claim 1, characterized in that A plurality of heat pipes (56, 96) are held in a multi-piece cooling body (94).

9. The dosing module (10) according to claim 8, characterized in that The multi-part heat sink (94) has a first heat sink part (102) and a second heat sink part (104) which are clamped to one another along a parting surface (100).

10. The dosing module (10) according to claim 8, characterized in that The multi-part cooling element (94) has at least one widening (112) for increasing the transfer surface (108).

11. The dosing module (10) according to claim 8, characterized in that A plurality of heat pipes (56, 96) are accommodated on the multi-part cooling body (94), the heat pipes being rotated relative to one another by an angle α in order to increase the heat exchange surface.

12. The dosing module (10) according to claim 11, characterized in that The orientation angle α is oriented in the range of 20° to 80° relative to the flow direction (86) of the cooling medium.

13. The dosing module (10) according to claim 9, characterized in that At least one heat pipe (56, 96) is clamped in the multi-part cooling body (94) in the region of the interface (100).

14. The dosing module (10) according to claim 1, characterized in that The dosing module comprises a heat exchanger (110) which is integrated into a dosing module housing (12).

15. The dosing module (10) according to claim 2, characterized in that The distributed tubes (59, 60, 61, 62) are arranged spaced apart from one another in the circumferential direction of the metering valve (18).

16. The dosing module (10) according to claim 2, characterized in that The heat pipe sections (114, 116) are arranged opposite each other on the metering valve (18).

17. The dosing module (10) according to claim 3, characterized in that A honeycomb structure (118) is implemented in a pot-shaped (58) heat pipe, which comprises 1 to n mutually separated cavities (120) as viewed in the circumferential direction.

18. The dosing module (10) according to claim 17, characterized in that The pot-shaped (58) heat pipe (56) having the honeycomb structure (118) is surrounded by a cylindrical heat exchange region in the condensation region (66).

19. Use of a metering module (10) according to any one of claims 1 to 18 in an exhaust system (42) of an internal combustion engine for metering operating / auxiliary substances into an exhaust gas flow (46) of an internal combustion engine of a passenger car or commercial vehicle.

20. Use of the dosing module (10) according to claim 19, characterized in that The operating / auxiliary material is a urea-water solution.

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