DE102018124081B4 - Exhaust gas cooling device with a heat exchanger - Google Patents

Abstract

Exhaust gas cooling device (100) for cooling exhaust gases from a motor vehicle, comprising: a device housing (101) which has a receptacle (105) for receiving a heat exchanger (107), the receptacle (105) being supported by a receiving wall (103, 103-1, 103-2, 103-3, 103-4), the receiving wall (103, 103-1, 103-2, 103-3, 103-4) having a wall thickness (106-1); anda heat exchanger (107) which is inserted up to an insertion depth (131) in the receptacle (105), the heat exchanger (107) having a heat exchanger housing (137) which is attached to the receptacle wall (103, 103-1, 103-2 , 103-3, 103-4), the insertion depth (131) being dependent on the wall thickness (106-1), the receiving wall (103, 103-1, 103-2, 103-3, 103-4) has an upper side receiving wall (103-1) which delimits an upper side of the receiver (105), has a lower side receiving wall (103-2) which delimits an underside of the receiver (105), has a first lateral side receiving wall (103-3) , which delimits a first lateral side of the receptacle (105) and has a second lateral side receiving wall (103-4) which delimits a second lateral side of the receptacle (105), and wherein the upper-side receiving wall (103-1), the lower-side receiving wall (103 -2), the first lateral receiving wall (103-3) and / or the second lateral receiving wall (103-4) has the wall thickness (106-1), and the underside receiving wall (103-2) has a thickened section (108-1) with a thickened section thickness (108-2) which is greater than the wall thickness (106- 1), the thickening section (108-1) connecting the receiving wall (103-2) on the underside with a bypass connector (115) of the device housing (101).

Description

The present disclosure relates to an exhaust gas cooling device with a heat exchanger, in particular an exhaust gas cooling device for cooling exhaust gases of a motor vehicle with a heat exchanger.

In conventional motor vehicles, the exhaust gases produced during the combustion process of the fuel are cooled by a cooled exhaust gas recirculation system and mixed in again with the intake air in order to lower the temperature during the combustion process and to reduce the amount of nitrogen oxides formed during the combustion process. Corresponding conventional exhaust gas recirculations include exhaust gas coolers with heat exchangers in order to remove heat from the exhaust gas during the cooling process.

In the DE 10 2014 006 761 A1 discloses an exhaust gas cooler for cooling exhaust gases from a motor vehicle.

The pamphlet DE 10 2014 219 096 A1 discloses a heat exchanger with a tube bundle with tubes as a heat exchanger matrix.

The pamphlet WO 2011/025 135 A1 discloses a bypass valve for an EGR valve P.

It is the object of the present disclosure to provide a durable and effective exhaust gas cooling device for cooling exhaust gases from a motor vehicle.

This object is achieved by the features of the independent claims. Advantageous embodiments of the disclosure are the subject of the dependent claims, the description and the accompanying figures.

The present disclosure is based on the knowledge that the above object can be achieved by an exhaust gas cooling device with a device housing and a heat exchanger plugged into the device housing, the insertion depth of the heat exchanger being dependent on the wall thickness of the receiving wall of the device housing.

Due to the dependence between the depth of insertion of the heat exchanger and the wall thickness of the receiving wall of the device housing, in particular a small wall thickness of the receiving wall can be ensured with a small insertion depth of the heat exchanger, so that a particularly high flexibility of the connection point between the heat exchanger and the device housing can be ensured. Due to the great flexibility between the heat exchanger and the device housing, thermal expansion of the heat exchanger or device housing can be compensated so that the tendency to crack can be prevented and the longevity of the exhaust gas cooling device can be ensured.

According to a first aspect, the disclosure relates to an exhaust gas cooling device for cooling exhaust gases from a motor vehicle, with a device housing which has a receptacle for receiving a heat exchanger, the receptacle being delimited by a receiving wall, the receiving wall having a wall thickness; and a heat exchanger which is inserted into the receptacle up to an insertion depth, the heat exchanger having a heat exchanger housing which rests against the receiving wall, and the insertion depth is dependent on the wall thickness.

This achieves the technical advantage that effective heat conduction between the heat exchanger and the device housing can be ensured through the contact between the heat exchanger and the device housing in order to ensure effective cooling of the exhaust gas by the exhaust gas cooling device.

Because the insertion depth is dependent on the wall thickness, the technical advantage is achieved that with a low insertion depth of the heat exchanger in the receptacle and a low wall thickness of the receptacle wall, advantageous flexibility can be ensured at the connection point between the heat exchanger and the device housing.

The advantageous flexibility correlates with an advantageous fatigue resistance of the connection between the device housing and the heat exchanger, which means that stresses caused by thermal expansion of the components during cyclical thermal loading can be better compensated for than with a particularly stiff and rigid connection. Thus, the exhaust gas cooling device according to the present disclosure is improved in terms of its behavior towards higher temperatures and its service life is extended.

In particular, the heat exchanger and the device housing are thermally coupled by the heat exchanger housing of the heat exchanger resting against the receiving wall of the device housing.

In particular, the heat exchanger has a rectangular, in particular square one Cross-section, and the receptacle is designed as a rectangular, in particular square receptacle.

In particular, the heat exchanger housing rests in sections circumferentially, in particular completely circumferentially, on the receiving wall of the device housing.

In particular, the device housing and / or the heat exchanger, in particular the heat exchanger housing, comprises metal, in particular cast iron and / or steel.

In an advantageous embodiment, the ratio of wall thickness to insertion depth is a maximum of 1 to 4.5, the ratio of wall thickness to insertion depth being in particular between 1: 5 and 1: 6.

This has the technical advantage that the specific ratio of wall thickness to insertion depth ensures particularly advantageous flexibility at the connection point between the heat exchanger and the device housing. In conventional, more rigid connections between the heat exchanger and the device housing, the ratio of wall thickness to insertion depth is in particular more than 1 to 4, and under certain circumstances an increased tendency to crack formation can occur.

In an advantageous embodiment, the wall thickness is between 0.5 mm and 1.5 mm, in particular between 0.8 mm and 1.2 mm, in particular 1.0 mm and / or the insertion depth is between 4.5 mm and 6.0 mm, in particular between 5.0 mm and 5.5 mm.

This has the technical advantage that the wall thicknesses and insertion depths can ensure a particularly advantageous flexibility between the heat exchanger and the receiving wall. In conventional, more rigid connections between the heat exchanger and the device housing, the wall thickness is in particular between 2.0 mm and 2.5 mm and / or the insertion depth is in particular 8.5 mm, with an increased tendency to crack formation under certain circumstances.

In an advantageous embodiment, the receiving wall has a top receiving wall which delimits an upper side of the receptacle, a bottom receiving wall which delimits an underside of the receptacle, a first lateral receiving wall which delimits a first lateral side of the receptacle and a second lateral receiving wall which has a the second lateral side of the receptacle, the upper-side receiving wall, the lower-side receiving wall, the first lateral-side receiving wall and / or the second lateral-side receiving wall having the wall thickness.

This has the technical advantage that effective circumferential contact can be ensured between the receiving wall and the heat exchanger housing. In particular, the top, bottom, first lateral and second lateral receiving walls have the wall thickness, so that the ratio between wall thickness and insertion depth is, in particular, completely the same all round. In particular, at least one of the top, bottom, first lateral and second lateral receiving walls has the wall thickness so that the ratio between wall thickness and insertion depth can be different, in particular depending on the respective top, bottom, first lateral or second lateral receiving wall.

In an advantageous embodiment, the receiving wall on the underside has a thickened portion with a thickened portion thickness that is greater than the wall thickness, the thickened portion connecting in particular the receiving wall on the underside with a bypass connector of the device housing.

This has the technical advantage that a stable attachment between the receiving wall and the device housing is ensured.

In an advantageous embodiment, the device housing delimits a housing interior, the device housing having a housing wall section which delimits an exhaust gas discharge chamber of the housing interior, the housing wall section adjoining the receiving wall, and in particular the housing wall section having a further wall thickness which is greater than the wall thickness of the receiving wall is.

This achieves the technical advantage that the housing wall section adjoining the receiving wall ensures particularly effective stabilization of the receiving wall. In particular, the housing wall section tapers in the direction of a side facing away from the receiving wall.

In an advantageous embodiment, the receiving wall has an inner edge on which the heat exchanger housing rests, the inner edge being arranged in particular between the receiving wall and the housing wall section.

This has the technical advantage that the inner edge ensures an effective delimitation for the heat exchanger inserted into the receptacle.

In an advantageous embodiment, the receiving wall has an outer edge which is arranged on a side of the receiving wall facing away from the inner edge, the outer edge being arranged in particular between the receiving wall and the housing wall section.

This achieves the technical advantage that by introducing the outer edge on the side of the receiving wall facing away from the inner edge, the wall thickness of the receiving wall can be effectively adjusted. In particular, the receiving wall is delimited by the inner edge and the outer edge. In particular, the wall thickness of the receiving wall corresponds to the distance between the inner edge and the outer edge.

In an advantageous embodiment, the heat exchanger housing can be inserted up to the insertion depth limited by the inner edge and the outer edge delimits a further depth on an outside of the receiving wall, the further depth being in particular less than the insertion depth.

In an advantageous embodiment, the heat exchanger has a plurality of heat exchange elements which are arranged within the heat exchanger housing of the heat exchanger, with exhaust gas ducts for guiding exhaust gas through the heat exchanger being formed in particular between the heat exchange elements.

This has the technical advantage that the heat exchanger elements ensure effective heat dissipation from the exhaust gas guided through the exhaust gas ducts. In particular, the heat exchanger elements are designed as heat exchanger plates and / or as heat exchanger hollow profiles.

In an advantageous embodiment, the heat exchanger elements are thermally coupled to one another, in particular thermally coupled by means of contacting heat webs of the respective heat exchanger elements.

This has the technical advantage that the thermal contact between the heat exchanger elements ensures a particularly effective dissipation of heat from the exhaust gas. In particular, opposing heat webs of the respective heat exchanger elements are in direct contact with one another in order to ensure an effective thermal coupling between the heat exchanger elements.

In an advantageous embodiment, the heat exchanger elements have an element contact area on an element end facing the device housing, which is in thermally conductive contact with a housing contact area arranged on a housing end of the heat exchanger housing facing the device housing.

This has the technical advantage that particularly effective heat transfer can be ensured between the heat exchanger elements and the heat exchanger housing.

In an advantageous embodiment, the heat exchanger housing has a housing wall thickness that is less than the wall thickness of the receiving wall, and / or the heat exchanger elements each have an element wall thickness that is less than a housing wall thickness of the heat exchanger housing.

This achieves the technical advantage that a particularly advantageous flexibility of the heat exchanger housing and / or the heat exchanger elements is ensured due to the small housing wall thickness of the heat exchanger housing and / or the small element wall thickness of the heat exchanger elements.

In an advantageous embodiment, the heat exchanger, in particular the heat exchanger housing, is materially connected to the device housing, in particular by a soldered connection, and / or the heat exchanger housing and the heat exchanger elements are materially connected, in particular by a soldered connection.

This has the technical advantage that a stable and effective thermally conductive connection is ensured between the components. In particular, the soldered connection between the device housing and the heat exchanger housing creates a seal which makes it possible to make the wall of the device housing thinner, this increasing the flexibility of the component and increasing the service life of the component.

In an advantageous embodiment, the device housing has an inlet nozzle through which exhaust gas can be introduced in a gas flow direction into a housing interior delimited by the device housing, the exhaust gas that can be introduced into the housing interior being guided in the gas flow direction through the heat exchanger accommodated in the receptacle to cool the exhaust gas can.

This has the technical advantage that the exhaust gas can be effectively guided through the inlet port through the housing interior and through the heat exchanger.

In an advantageous embodiment, the device housing has a bypass connector for receiving a bypass pipe, the bypass connector being arranged in particular fluidically parallel to the heat exchanger accommodated in the receptacle, with exhaust gas that can be introduced into the housing interior in a further gas flow direction through the bypass -Port and can be guided through the bypass pipe, the further gas flow direction running in particular fluidly parallel to the gas flow direction.

This has the technical advantage that the exhaust gas can either be passed through the heat exchanger for cooling, or that the exhaust gas can be passed through the bypass pipe without being cooled.

In an advantageous embodiment, the device housing has a valve opening fluidly connected to the housing interior for receiving a pressure valve, and / or the device housing has a lateral opening fluidically connected to the housing interior which can be closed by a flap element.

This has the technical advantage that a pressure valve accommodated in the valve opening ensures pressure relief when there is overpressure in the interior of the housing, and that the device housing can be adapted in terms of installation space through the lateral opening that can be closed by the flap element.

In an advantageous embodiment, the device housing also has a coolant inlet connector for admitting coolant and a coolant outlet fluidly connected to the coolant inlet connector for discharging coolant.

This achieves the technical advantage that coolant guided through the coolant inlet and through the coolant outlet can advantageously cool the device housing. In this case, the housing interior bounded by the device housing for guiding exhaust gas and the fluid-technical connection between the coolant outlet and coolant inlet for guiding coolant are fluidically separated from one another.

According to a second aspect, the disclosure relates to a method for producing an exhaust gas cooling device for cooling exhaust gases from a motor vehicle, comprising the following method steps, providing a device housing which has a receptacle for receiving a heat exchanger, the receptacle being delimited by a receiving wall, the receiving wall having a wall thickness, inserting a heat exchanger into the receptacle up to an insertion depth, the insertion depth being dependent on the wall thickness, and wherein the heat exchanger has a heat exchanger housing which rests against the receptacle wall, and connecting, in particular material connection, the heat exchanger housing to the receptacle wall .

This has the technical advantage that an effective exhaust gas cooling device can be produced. In particular, the material connection of the heat exchanger housing to the receiving wall comprises the soldering of the heat exchanger housing to the receiving wall.

In an advantageous embodiment, the provision of the device housing comprises the method step of inserting, in particular milling, an inner edge and / or outer edge into the device housing in order to form the receiving wall with the wall thickness.

• 1 eine Abgaskühlvorrichtung ohne einen Wärmetauscher gemäß einer Ausführungsform;
• 2 eine Abgaskühlvorrichtung mit einem Wärmetauscher gemäß einer Ausführungsform in einer Schnittdarstellung;
• 3 eine Abgaskühlvorrichtung mit einem Wärmetauscher gemäß einer Ausführungsform in einer perspektivischen Darstellung;
• 4 eine Abgaskühlvorrichtung mit einem Wärmetauscher gemäß einer Ausführungsform in einer weiteren perspektivischen Darstellung; und
• 5 eine schematische Darstellung eines Verfahrens zum Herstellen einer Abgaskühlvorrichtung.

Further exemplary embodiments are explained with reference to the accompanying figures. Show it:

• 1 an exhaust gas cooling device without a heat exchanger according to an embodiment;
• 2 an exhaust gas cooling device with a heat exchanger according to an embodiment in a sectional view;
• 3 an exhaust gas cooling device with a heat exchanger according to one embodiment in a perspective view;
• 4th an exhaust gas cooling device with a heat exchanger according to one embodiment in a further perspective illustration; and
• 5 a schematic representation of a method for producing an exhaust gas cooling device.

1 shows an exhaust gas cooling device without a heat exchanger according to an embodiment. In conventional motor vehicles, the exhaust gases produced during the combustion process of the fuel are cooled by a cooled exhaust gas recirculation system and mixed in with the intake air in order to lower the temperature during the combustion process and the amount of during the combustion process to reduce nitrogen oxides formed. Corresponding conventional exhaust gas recirculations include exhaust gas coolers with heat exchangers in order to remove heat from the exhaust gas to be cooled during a cooling process.

the 1 shows an exhaust gas cooling device according to the present disclosure, which is shown without a heat exchanger for illustrative reasons. The exhaust gas cooling device 100 includes a device housing 101 with one through a receiving wall 103 limited intake 105 for recording an in 1 heat exchanger not shown 107 . The receiving wall 103 has an in 1 wall thickness shown only schematically 106-1 on.

The receiving wall 103 in particular has a receiving wall on the top 103-1 on which is a top of the intake 105 limited. The receiving wall 103 has in particular a receiving wall on the underside 103-2 on which is a bottom of the recording 105 limited. The receiving wall 103 has in particular a first lateral receiving wall 103-3 on which a first lateral side of the recording 105 limited. The receiving wall 103 has in particular a second receiving wall on the lateral side 103-4 on which a second lateral side of the recording 105 limited.

In particular, the receiving wall on the top has 103-1 , the underside receiving wall 103-2 , the first lateral receiving wall 103-3 and / or the second lateral receiving wall 103-4 the wall thickness 106-1 on. In the in 1 The illustrated embodiment according to the present disclosure has the upper, lower, first and second lateral receiving walls 103-1 , 103-2 , 103-3 , 103-4 the wall thickness 106-1 on.

As from the 1 shows, has the underside receiving wall 103-2 in particular a thickened portion 108-1 with a thickened section thickness 108-2, which is greater than the wall thickness 106-1 is. Here, the thickened section connects 108-1 in particular the receiving wall on the underside 103-2 with a bypass port 115 of the device housing 101 .

The receiving wall 103 , in particular the top, bottom, first and / or second lateral receiving wall 103-1 , 103-2 , 103-3 , 103-4 , has an inner edge 110-1 on which of the in 1 heat exchangers not shown 107 is applied. Here is the inside edge 110-1 especially between the receiving wall 103 and a housing wall section 101-1 of the device housing 101 arranged.

The receiving wall 103 , in particular the top, bottom, first and / or second lateral receiving wall 103-1 , 103-2 , 103-3 , 103-4 , has an outer edge 110-2 on which one of the inner edge 110-1 facing away from the receiving wall 103 is arranged. Here is the outer edge 110-2 especially between the receiving wall 103 and the housing wall section 101-1 of the device housing 101 arranged.

The device housing 101 delimits a housing interior 109 . The housing wall section 101-1 of the device housing 101 delimits an exhaust gas discharge chamber 109-1 the interior of the housing 109 . The housing wall section 101-1 adjoins the receiving wall 103 , in particular to the upper, lower, first and / or second lateral receiving wall 103-1 , 103-2 , 103-3 , 103-4 , on. The housing wall section 101-1 has in particular another in 1 wall thickness shown schematically 106-2 which is greater than the wall thickness 106-1 the receiving wall 103 is.

Like in the 1 is shown, the housing wall section tapers 101-1 especially in the direction of one of the receiving wall 103 remote side.

The device housing 101 also has an insertion nozzle 111 for introducing exhaust gas into the interior of the housing 109 on. That through the insertion nozzle 111 in the interior of the housing 109 in a gas flow direction 113 Introduced exhaust gas is through the in the intake 105 recorded and in 1 heat exchanger not shown 107 in the gas flow direction 113 led to cool the exhaust gas.

The device housing 101 also has a bypass port 115 for recording an in 1 bypass pipe not shown 117 through which the exhaust gas from the housing interior 109 in a further gas flow direction 119 on the one in the recording 105 recorded heat exchanger 107 Can be bypassed so as not to cool the exhaust gas any further.

The device housing 101 also has one with the housing interior 109 fluidically connected lateral opening 121 on which by a 1 not shown flap element is closable.

The device housing 101 also has one with the housing interior 109 fluidically connected valve opening 129 on which an in 1 pressure valve, not shown, is closed.

The device housing 101 also has a coolant inlet port 123 for admitting coolant and furthermore has a coolant outlet 125 for discharging coolant. The coolant inlet nozzle is here 123 and the coolant outlet 125 with the housing interior 109 not in fluidic contact. Through the coolant inlet port 123 becomes coolant, e.g. water, in a coolant flow direction 127 to the coolant outlet 125 led to the fixture housing 101 effective cooling.

For more details on how the exhaust gas cooling device works 100 will refer to the following figures.

2 shows an exhaust gas cooling device with a heat exchanger according to an embodiment in a sectional view.

The exhaust gas cooling device 100 includes a device housing 101 with one through a receiving wall 103 limited intake 105 to accommodate a heat exchanger 107 , with a bypass port 115 for receiving a bypass pipe 117 , and with an insertion nozzle 111 through which the exhaust gases in a gas flow direction 113 into one of the device housing 101 limited housing interior 109 can be introduced. The exhaust gas can be released from the interior of the housing 109 in the gas flow direction 113 through the one in the recording 105 recorded heat exchanger 107 to cool the exhaust gas or can be performed in a further gas flow direction 119 through the bypass pipe 117 be performed without cooling the exhaust gas.

There is also one with the housing interior 109 fluidically connected valve opening 129 in 2 shown. In addition, in 2 one of the housing interior 109 fluidically separated coolant outlet 125 shown for discharging coolant.

Conventional exhaust gas coolers are prone to heat cycle malfunctions, as a result of which the cooling performance of corresponding conventional exhaust gas coolers can be reduced. In particular, the connection between the housing of the exhaust gas cooler and the heat exchanger is often problematic because, on the one hand, the tightness of the system must be ensured and, on the other hand, the cyclical thermal loads must be taken into account in order to meet the service life requirements of exhaust gas coolers.

Conventional exhaust gas coolers are made of cast material with a wall thickness of in particular 2 mm to 2.5 mm and an insertion depth of the heat exchanger of in particular 8.5 mm, with the thickest possible wall thickness of the housing of the exhaust gas cooler, or a large overlap between the heat exchanger and the exhaust gas cooler is selected in order to increase the thermal durability of the components to one another. For this purpose, in conventional exhaust gas coolers, the heat exchanger is often pushed into the housing of the exhaust gas cooler as far as it will go.

With the exhaust gas cooling device 100 according to the present disclosure it was found that a shallow insertion depth 131 of the heat exchanger 107 into the device housing 101 the exhaust gas cooling device 100 and a thin receiving wall 103 with a small wall thickness 106-1 thermal advantages in the overlap area between the device housing 101 the exhaust gas cooling device 100 and the heat exchanger 107 provide and also an advantageous fatigue resistance of the heat exchanger 107 and the device housing 101 to ensure.

In the exhaust gas cooling device 100 according to the present disclosure, the receiving wall 103 one in 2 wall thickness shown only schematically 106-1 on and is the heat exchanger 107 up to an insertion depth 131 in the recording 105 introduced, the insertion depth 131 on the wall thickness 106-1 the receiving wall 103 is dependent.

In particular, the wall thickness is 106-1 between 0.5 mm and 1.5 mm, in particular between 0.8 mm and 1.2 mm, in particular 1.0 mm. In particular, the insertion depth is 131 between 4.5 mm and 6.0 mm, in particular between 5.0 mm and 5.5 mm.

In particular, the ratio of the wall thickness is 106-1 and insertion depth 131 a maximum of 1 in 4.5, especially between 1 in 5 and 1 in 6.

Due to the thin wall thickness 106-1 the receiving wall 103 , as well as the low insertion depth 131 of the heat exchanger 107 into the device housing 101 the rigidity of the exhaust gas cooling device is reduced 100 and thus leads to an advantageous fatigue resistance of the components to one another. The more advantageous fatigue resistance of the connection is based on the fact that in the area of the connection between the device housing 101 and the heat exchanger 107 an advantageous flexibility is present, whereby stresses caused by thermal expansion of the components during cyclical thermal loading can be compensated better than with a particularly stiff and rigid connection. Thus, the exhaust gas cooling device becomes 100 according to the present disclosure in terms of their behavior Improved against higher temperatures and their service life is extended, since stress cracks are avoided.

Due to the smaller wall thickness 106-1 the receiving wall 103 of the device housing 101 can thus thermal expansion on the heat exchanger 107 be adjusted. By a calm pouring of the device housing, which consists in particular of cast material 101 the disadvantage of the formation of voids in the casting is avoided to the extent that there are no relevant leaks in the device housing 101 develop.

The heat exchanger 107 in particular has a heat exchanger housing 137 on what heat exchange elements 139 , in particular heat exchanger plates and / or heat exchanger hollow bodies, are arranged, in particular between the heat exchange elements 139 a plurality of exhaust ducts 141 for guiding exhaust gas through the heat exchanger 107 are formed. This can be done through the exhaust ducts 141 guided hot exhaust heat to the heat exchanger elements 139 release and thereby be cooled.

In particular, the heat exchanger elements 139 with the heat exchanger housing 137 and / or the device housing 101 thermally coupled for effective heat dissipation from the heat exchanger elements 139 to ensure. In particular, the heat exchanger housing 137 Heat bars 143 on those with heat bars 143 the heat exchanger elements 139 are in contact to ensure effective heat conduction between the heat exchanger elements 139 and the heat exchanger housing 137 to ensure.

In particular, the heat exchanger elements 139 on one of the device housing 101 facing element end 145 an element contact area 147 on, which with one on one of the device housing 101 facing end of the housing 149 of the heat exchanger housing 137 arranged housing contact area 151 is in thermally conductive contact.

In particular, the receiving wall 103 of the device housing 101 an inside edge 110-1 on which the heat exchanger 107 , especially the heat exchanger housing 137 , is present. In particular is the inside edge 110-1 between the receiving wall 103 and a housing wall section 101-1 of the device housing 101 arranged. Another wall thickness 106-2 of the housing wall section 101-1 is especially larger than that in 2 wall thickness shown only schematically 106-1 the receiving wall 103 .

In particular, the receiving wall 103 an outer edge 110-2 on which one of the inner edge 110-1 facing away from the receiving wall 103 is arranged, the outer edge 110-2 especially between the receiving wall 103 and the housing wall section 101-1 of the device housing 101 is arranged.

In particular, the heat exchanger 107 , especially the heat exchanger housing 137 , with the fixture housing 101 cohesively connected, in particular by a soldered connection. In particular, the heat exchanger housing 137 and / or the heat exchanger elements 139 cohesively connected, in particular by a soldered connection.

In particular, the heat exchanger housing 137 a housing wall thickness which is less than the wall thickness 106-1 the receiving wall 103 is. In particular, the heat exchanger elements 139 each has an element wall thickness which is less than the housing wall thickness of the heat exchanger housing 137 is.

3 shows an exhaust gas cooling device with a heat exchanger according to the first embodiment in a perspective view. For details of the exhaust gas cooling device 100 will refer to the remarks on the 1 and 2 referenced.

4th shows an exhaust gas cooling device with a heat exchanger according to the first embodiment in a further perspective illustration. For details of the exhaust gas cooling device 100 will refer to the remarks on the 1 and 2 referenced.

5 shows a schematic representation of a method for producing an exhaust gas cooling device. The procedure 200 for producing an exhaust gas cooling device 100 for cooling exhaust gases from a motor vehicle comprises the following method steps.

The first method step comprises providing 201 a device housing 101 having a recording 105 to accommodate a heat exchanger 107 having, the recording 105 through a receiving wall 103 , 103-1 , 103-2 , 103-3 , 103-4 is limited, the receiving wall 103 , 103-1 , 103-2 , 103-3 , 103-4 a wall thickness 106-1 having.

The second step involves plugging in 203 a heat exchanger 107 in the recording 105 up to an insertion depth 131 , where the insertion depth 131 on the wall thickness 106-1 depends, and where the heat exchanger 107 a heat exchanger housing 137 has, which on the receiving wall 103 , 103-1 , 103-2 , 103-3 , 103-4 is applied.

The third method step comprises connecting 205 , in particular a material bond 205 , the heat exchanger housing 137 with the receiving wall 103 , 103-1 , 103-2 , 103-3 , 103-4 .

List of reference symbols

100

Exhaust gas cooling device

101

Fixture housing

101-1

Housing wall section

103

Receiving wall

103-1

Upper receiving wall

103-2

Underside receiving wall

103-3

First lateral receiving wall

103-4

Second lateral receiving wall

105

admission

106-1

Wall thickness of the receiving wall

106-2

Further wall thickness of the housing wall section

107

Heat exchanger

108-1

Thickened section

108-2

Thickening section thickness

109

Housing interior

109-1

Exhaust gas discharge chamber

110-1

Inside edge

110-2

Outer edge

111

Insertion nozzle

113

Direction of gas flow

115

Bypass port

117

Bypass pipe

119

Further gas flow direction

121

Lateral opening of the device housing

123

Coolant inlet nozzle

125

Coolant outlet

127

Coolant flow direction

129

Valve opening

131

Insertion depth

137

Heat exchanger housing

139

Heat exchange elements

141

Exhaust duct

143

Heat bars

145

Element end of the heat exchange element

147

Element contact area of the heat exchange element

149

Housing end of the heat exchanger housing

151

Housing contact area of the heat exchanger housing

153

Receiving wall contact area of the receiving wall

200

Method for manufacturing an exhaust gas cooling device

201

Method step: providing a device housing

203

Process step: inserting a heat exchanger

205

Process step: connecting the heat exchanger housing to the receiving wall

Claims (17)

Exhaust gas cooling device (100) for cooling exhaust gases from a motor vehicle, comprising: a device housing (101) which has a receptacle (105) for receiving a heat exchanger (107), the receptacle (105) being supported by a receiving wall (103, 103-1, 103-2, 103-3, 103-4), the receiving wall (103, 103-1, 103-2, 103-3, 103-4) having a wall thickness (106-1); and a heat exchanger (107) which is inserted up to an insertion depth (131) in the receptacle (105), the heat exchanger (107) having a heat exchanger housing (137) which is attached to the receiving wall (103, 103-1, 103- 2, 103-3, 103-4), the insertion depth (131) being dependent on the wall thickness (106-1), the receiving wall (103, 103-1, 103-2, 103-3, 103-4 ) has an upper side receiving wall (103-1) which delimits an upper side of the receiver (105), a lower side receiving wall (103-2) which delimits an underside of the receiver (105), a first lateral side receiving wall (103-3) which delimits a first lateral side of the receptacle (105) and has a second lateral side receiving wall (103-4) which delimits a second lateral side of the receptacle (105), and wherein the upper-side receiving wall (103-1), the lower-side receiving wall ( 103-2), the first on the lateral side Receiving wall (103-3) and / or the second lateral receiving wall (103-4) has the wall thickness (106-1), and the receiving wall (103-2) on the underside has a thickened section (108-1) with a thickened section thickness (108- 2), which is greater than the wall thickness (106-1), the thickening section (108-1) connecting the receiving wall (103-2) on the underside with a bypass connector (115) of the device housing (101). Exhaust gas cooling device (100) after Claim 1 , the ratio of wall thickness (106-1) to insertion depth (131) being a maximum of 1 to 4.5, the ratio of wall thickness (106-1) to insertion depth (131) being in particular between 1: 5 and 1: 6. Exhaust gas cooling device (100) after Claim 1 or 2 , wherein the wall thickness (106-1) is between 0.5 mm and 1.5 mm, in particular between 0.8 mm and 1.2 mm, in particular 1.0 mm and / or where the insertion depth (131) is between 4, 5 mm and 6.0 mm, in particular between 5.0 mm and 5.5 mm. Exhaust gas cooling device (100) according to one of the preceding claims, wherein the device housing (101) delimits a housing interior (109), wherein the device housing (101) has a housing wall section (101-1) which has an exhaust gas discharge chamber (109-1) of the housing interior (109) ), wherein the housing wall section (101-1) adjoins the receiving wall (103, 103-1, 103-2, 103-3, 103-4), and in particular the housing wall section (101-1) has a further wall thickness ( 106-2), which is greater than the wall thickness (106-1) of the receiving wall (103, 103-1, 103-2, 103-3, 103-4). Exhaust gas cooling device (100) according to one of the preceding claims, wherein the receiving wall (103, 103-1, 103-2, 103-3, 103-4) has an inner edge (110-1) on which the heat exchanger housing (137) rests, wherein the inner edge (110-1) is arranged in particular between the receiving wall (103, 103-1, 103-2, 103-3, 103-4) and the housing wall section (101-1). Exhaust gas cooling device (100) after Claim 5 , wherein the receiving wall (103, 103-1, 103-2, 103-3, 103-4) has an outer edge (110-2) which on a side of the receiving wall (103, 103 -1, 103-2, 103-3, 103-4), the outer edge (110-2) in particular between the receiving wall (103, 103-1, 103-2, 103-3, 103-4) and the housing wall section (101-1) is arranged. Exhaust gas cooling device (100) according to one of the preceding claims, wherein the heat exchanger (107) has a plurality of heat exchange elements (139) which are arranged within the heat exchanger housing (137) of the heat exchanger (107), with exhaust gas ducts (139) in particular between the heat exchange elements (139). 141) are formed for guiding exhaust gas through the heat exchanger (107). Exhaust gas cooling device (100) after Claim 7 , the heat exchanger elements (139) being thermally coupled to one another, in particular being thermally coupled by means of contacting heat webs (143) of the respective heat exchanger elements (139). Exhaust gas cooling device (100) after Claim 7 or 8th , wherein the heat exchanger elements (139) at an element end (145) facing the device housing (101) have an element contact area (147) which is arranged with a housing contact area (151) arranged on a housing end (149) of the heat exchanger housing (137) facing the device housing (101) ) is in thermally conductive contact. Exhaust gas cooling device (100) according to one of the preceding Claims 7 until 9 , wherein the heat exchanger housing (137) has a housing wall thickness which is less than the wall thickness (106-1) of the receiving wall (103, 103-1, 103-2, 103-3, 103-4), and / or wherein the heat exchanger elements (139) each have an element wall thickness which is less than a housing wall thickness of the heat exchanger housing (137). The exhaust gas cooling device (100) according to any one of the preceding claims, wherein the heat exchanger (107), in particular the heat exchanger housing (137), is materially connected to the device housing (101), in particular by a soldered connection, and / or wherein the heat exchanger housing (137) and the heat exchanger elements (139) are materially connected, in particular by a soldered connection. The exhaust gas cooling device (100) according to any one of the preceding claims, wherein the device housing (101) has an inlet connector (111) through which exhaust gas can be introduced in a gas flow direction (113) into a housing interior (109) delimited by the device housing (101), wherein the Exhaust gas which can be introduced into the housing interior (109) can be conducted in the gas flow direction (113) through the heat exchanger (107) accommodated in the receptacle (105) to cool the exhaust gas. Exhaust gas cooling device (100) according to one of the preceding claims, wherein the device housing (101) has a bypass connector (115) for receiving a bypass pipe (117), the bypass connector (115) in particular fluidly parallel to that in the receptacle (105) accommodated heat exchanger (107) is arranged, wherein in the housing interior (109) introductable exhaust gas can be guided in a further gas flow direction (119) through the bypass connector (115) and through the bypass pipe (117), the further The gas flow direction (119) runs in particular fluidly parallel to the gas flow direction (113). The exhaust gas cooling device (100) according to any one of the preceding claims, wherein the device housing (101) has a valve opening (129) fluidly connected to the housing interior (109) for receiving a pressure valve, and / or wherein the device housing (101) is connected to the housing interior (109) ) has fluidically connected lateral opening (121) which can be closed by a flap element. The exhaust gas cooling device (100) according to any one of the preceding claims, wherein the device housing (101) further has a coolant inlet connector (123) for admitting coolant and a coolant outlet (125) fluidly connected to the coolant inlet connector (123) for discharging coolant. A method (200) for producing an exhaust gas cooling device (100) for cooling exhaust gases from a motor vehicle, comprising the following method steps: Providing (201) a device housing (101) which has a receptacle (105) for receiving a heat exchanger (107), the receptacle (105) being supported by a receiving wall (103, 103-1, 103-2, 103-3, 103 -4) is limited, the receiving wall (103, 103-1, 103-2, 103-3, 103-4) having a wall thickness (106-1); Insertion (203) of a heat exchanger (107) into the receptacle (105) up to an insertion depth (131), the insertion depth (131) being dependent on the wall thickness (106-1), and the heat exchanger (107) being a heat exchanger housing ( 137), which rests against the receiving wall (103, 103-1, 103-2, 103-3, 103-4), and Connect (205), in particular material connection (205), of the heat exchanger housing (137) to the receiving wall (103, 103-1, 103-2, 103-3, 103-4), wherein the receiving wall (103, 103-1, 103-2, 103-3, 103-4) has an upper receiving wall (103-1) which delimits an upper side of the receiving wall (105), a lower receiving wall (103-2) which delimits an underside of the receptacle (105), has a first lateral receiving wall (103-3) which delimits a first lateral side of the receptacle (105) and has a second lateral receiving wall (103-4) which has a second lateral side of the The receiving wall (103-1) on the upper side, the receiving wall (103-2) on the lower side, the first receiving wall (103-3) on the lateral side and / or the second receiving wall (103-4) on the lateral side have the wall thickness (105). 106-1), and wherein the receiving wall (103-2) on the underside has a thickening section (108-1) with a thickness (108-2) of a thickening section which is greater than the wall thickness (106-1), the thickening section (108-1) forming the receiving wall (108-1) on the underside ( 103-2) connects to a bypass connection (115) of the device housing (101). Method (200) according to Claim 16 , wherein the provision (201) of the device housing (101) comprises the method step of inserting, in particular milling, an inner edge (110-1) and / or outer edge (110-2) into the device housing (101) in order to surround the receiving wall (103, 103-1, 103-2, 103-3, 103-4) with the wall thickness (106-1).

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