EP1714098B1 - Assembly of two heat exchangers - Google Patents

Description

The invention relates to an arrangement of two heat exchangers known by the DE-A 199 53 787 the applicant.

Modern motor vehicles, in particular the middle and upper market segment are equipped with air conditioning as standard, ie they have both a coolant radiator and a refrigerant condenser, which are arranged in the front engine compartment and fixed to the vehicle frame. The coolant radiator and the Kältemütelkondensator the air conditioning are often combined into a cooling module, which may include other heat exchangers such as charge air cooler or oil cooler, as a unit. All heat exchangers have a network consisting of tubes and fins, also called tube / fin block, as well as collecting boxes or headers into which the tubes open. In the arrangement of a plurality of heat exchangers to a cooling module, the tubes of the individual heat exchanger are usually aligned in parallel, so that collection boxes or manifolds are arranged side by side. This facilitates the mounting options of the heat exchanger with each other. By the DE-A 197 22 097 The Applicant has disclosed such an arrangement of a coolant radiator, a refrigerant condenser and a charge air cooler for so-called all-metal or all-aluminum heat exchangers.

By the DE-A 197 31 999 a cooling module, consisting of a cross-flow cooler and a cross-flow capacitor, known, ie of two heat exchangers whose tubes are arranged horizontally and parallel to each other in the vehicle. Radiator and condenser are held above each other in the vehicle and in the vehicle. The parallel juxtaposed coolant boxes of the radiator and the manifolds of the condenser offer convenient mounting options.

By the DE-A 198 49 561 has been known a front module for a motor vehicle, wherein a downdraft cooler, ie with vertically arranged tubes and a cross-flow capacitor in a common frame made of plastic, a so-called front end panel are added. Radiator and condenser are thus not mutually, but each held opposite to the plastic frame, which indeed facilitates the mounting options, however, a complex, made of plastic or composite frame, the front end panel requires. Such front modules are not suitable for all vehicles.

By the above DE-A 199 53 787 from which the invention proceeds, an arrangement of heat exchangers, ie a cooling module for a motor vehicle has been known, wherein a charge air cooler attached to a coolant radiator by injection molded to the manifolds holding means and a capacitor is arranged between the two heat exchangers. The tubes of the three heat exchangers are arranged horizontally and their headers or headers laterally. Although this results in favorable mounting options, especially if the coolant and charge air boxes are made of plastic and provided with anspritzbaren Befestigungsmittein, on the other hand there is a relatively large air gap in the air flow direction between the individual heat exchangers, resulting in an increased depth. This is usually perceived as disadvantageous from the perspective of the vehicle manufacturer. Other arrangements for mutual attachment are made JP 2001124491 A . JP 2003278546 A and DE 29707571 U known.

It is an object of the present invention to improve the fastening possibilities of two heat exchangers of a motor vehicle, in particular of a coolant radiator and a refrigerant condenser in such a way, that a pre-assembly before installation in the vehicle and thus a simplified and space-saving installation in the vehicle is possible.

This object is solved by the features of patent claim 1. According to the invention, the tubes of the heat exchangers are arranged crosswise and their collecting tanks or collecting tubes are each offset by 90 degrees from each other. Although the crosswise arrangement of heat exchangers is known per se, d. H. either in conjunction with a front module or in a separate arrangement and attachment of the heat exchanger in the vehicle.

According to the invention, however, the heat exchangers are mutually connected. Thus, the advantage of a compact pre-assembled unit is achieved, which has a small overall depth and is easy to use in the vehicle.

In an embodiment not belonging to the invention, the fastening means are arranged on the header boxes of the first heat exchanger, d. H. preferably molded and formed as overhanging holder on which the headers of the second heat exchanger are supported. This is fixed at four points. The advantage here is that no fasteners are necessary on the second heat exchanger.

In an embodiment not belonging to the invention, the side parts of the first heat exchanger of the attachment, wherein a side part in each case a collecting pipe of the second heat exchanger are opposite. In this case, the side part of the first heat exchanger can be integrated into the manifold of the second heat exchanger, so that the first and the second heat exchanger form a non-detachable unit after soldering.

In an embodiment which does not belong to the invention, the overhanging holders molded onto the collecting box can also be fastened to the side part of the second heat exchanger, by means of an integrated clip or latching connection or with an additional clip. Advantageously, the side part of the second heat exchanger for L-shaped formed in cross-section, so that there are attachment options by characteristics.

In an embodiment not belonging to the invention can be arranged on the one hand on the side part holder, preferably in one piece and are soldered to the manifold, on the other hand, the holder can also be attached to the manifold and soldered to the side part. The holders are advantageously arranged as a V-shaped, mutually entangled lobes, as a right angle bent tabs or as notched forks, with which the manifold is soldered. In particular, in the bifurcated holders an elasticity is achieved, which allows different strains between the first and second heat exchanger block and thus avoids thermally induced stresses.

For the purposes of the invention, additional, advantageously standardized, connecting elements are provided with which both heat exchangers are connected to one another at their corner regions. The connecting element formed as a plastic part is clipped on the one hand to the collecting box and on the other hand comprises a corner region of the second heat exchanger. The connecting elements are preferably designed as identical parts, whereby the manufacturing costs are reduced.

In a further embodiment of the invention, the arrangements according to the invention form heat exchanger modules, d. H. finished brazed assemblies.

According to an advantageous embodiment of the invention, the heat exchanger module comprises a downdraft cooler, ie a coolant radiator with vertically arranged tubes and a cross-flow condenser, ie with horizontally extending tubes. This combination of two Kraftfahrzeugwärmeübertragern is particularly common - therefore it is of particular advantage if both are pre-assembled in the inventive arrangement. The air gap between the network of the condenser and the network of the condenser can be minimized by the crosswise arrangement of the tubes, resulting in a minimum depth. For the fasteners of both Heat exchangers with each other results in a variety of ways, with each of the collection or coolant boxes, headers and side panels can be used for mutual attachment.

According to a further advantageous embodiment of the invention, the heat exchanger module is characterized by a combination of a cross-flow condenser with an oil cooler.

In a further advantageous embodiment of the invention, a main and a low-temperature radiator form the heat transfer module as a downflow or cross-flow cooler.

Fig. 1

eine Baueinheit, bestehend aus Kühlmittelkühler und Kältemittelkondensator,

Fig. 2

einen Eckbereich der Baueinheit gemäß Fig. 1,

Fig. 3

eine weitere Befestigungsmöglichkeit zwischen Kühlmittelkasten und Sammelrohr vor der Montage,

Fig. 4

die Befestigung gemäß Fig. 3 nach der Montage,

Fig. 5

eine weitere Befestigungsmöglichkeit mit Clipsverbindung zwischen Kühlmittelkasten und Seitenteil des Kondensators,

Fig. 6

eine Clipsverbindung oben zwischen Kühlmittelkasten und Seitenteil mit zusätzlichem Clip,

Fig. 7

eine weitere Befestigungsmöglichkeit zwischen Kühlmittelkasten und Seitenteil des Kondensators,

Fig. 8

eine weitere Befestigungsmöglichkeit zwischen Seitenteil des Kühlers und Sammelrohr des Kondensators vor der Montage,

Fig. 9

die Befestigungsmöglichkeit gemäß Fig. 8 nach der Montage und nach dem Löten,

Fig. 10

eine weitere Befestigungsmöglichkeit mit Integration von Seitenteil des Kühlers mit Sammelrohr des Kondensators,

Fig. 11

die Befestigungsmöglichkeit gemäß Fig. 10, Seitenteil und Boden integriert,

Fig. 12

eine weitere Befestigungsmöglichkeit zwischen Seitenteil des Kühlers und Sammelrohr des Kondensators mit Halter am Sammelrohr,

Fig. 13

eine weitere Befestigungsmöglichkeit zwischen Kühlmittelkasten und Sammelrohr durch verlängertes Sammelrohr,

Fig. 14

ein Ausführungsbeispiel der Erfindung mit einer Befestigungsmäglichkeit im oberen Eckbereich mit einem zusätzlichen Verbindungselement,

Fig. 15

die Befestigungsmöglichkeit analog Fig. 14 für den unteren Eckbereich,

Fig. 16

die montierte Befestigung im oberen Eckbereich,

Fig. 17

die montierte Befestigung im unteren Eckbereich,

Fig. 18, 18a

eine nicht zur Erfindung gehörende weitere Ausführungsform für eine Befestigung zwischen Seitenteil des Kühlers und Sammelrohr des Kondensators,

Fig. 19, 19a

eine nicht zur Erfindung gehörende weitere Ausführungsform für eine Befestigung zwischen Seitenteil des Kühlers und Sammelrohr des Kondensators,

Fig. 20

ein gelötetes Wärmeübertragermoduf, bestehend aus einem Querstromkondensator und einem Ölkühler,

Fig. 20a

einen Eckausschnitt des Wärmeübertragermoduls gemäß Fig. 20,

Fig. 21

ein weiteres gelötetes Wärmeübertragermodul, bestehend aus einem Fallstrom-Hauptkühler und einem Querstrom-Niedertemperaturkühler, und

Fig. 21a

einen Eckausschnitt des Wärmeübertragermoduls gemäß Fig. 21.

Embodiments of the invention are illustrated in the drawings and will be described in more detail below. Show it

Fig. 1

a structural unit consisting of coolant radiator and refrigerant condenser,

Fig. 2

a corner region of the assembly according to Fig. 1 .

Fig. 3

Another possibility of attachment between coolant box and manifold before assembly,

Fig. 4

the attachment according to Fig. 3 after assembly,

Fig. 5

Another mounting option with clip connection between the coolant box and the side part of the condenser,

Fig. 6

a clip connection at the top between the coolant box and the side part with additional clip,

Fig. 7

Another possibility of attachment between coolant box and side part of the condenser,

Fig. 8

another possibility of attachment between side part of the cooler and collector of the capacitor before assembly,

Fig. 9

the possibility of attachment according to Fig. 8 after assembly and after soldering,

Fig. 10

Another mounting option with integration of side part of the radiator with manifold of the capacitor,

Fig. 11

the possibility of attachment according to Fig. 10 , Side and bottom integrated,

Fig. 12

Another mounting option between side part of the radiator and manifold of the condenser with holder on the manifold,

Fig. 13

Another possibility of attachment between the coolant tank and manifold by extended manifold,

Fig. 14

An embodiment of the invention with a Befestigungsmäglichkeit in the upper corner area with an additional connecting element,

Fig. 15

the possibility of attachment analog Fig. 14 for the lower corner area,

Fig. 16

the mounted attachment in the upper corner area,

Fig. 17

the mounted attachment in the lower corner area,

Fig. 18, 18a

a not belonging to the invention further embodiment for attachment between the side part of the radiator and manifold of the capacitor,

Fig. 19, 19a

a not belonging to the invention further embodiment for attachment between the side part of the radiator and manifold of the capacitor,

Fig. 20

a brazed heat exchanger module consisting of a cross-flow condenser and an oil cooler,

Fig. 20a

a corner section of the heat exchanger module according to Fig. 20 .

Fig. 21

another soldered heat exchanger module consisting of a falling-main and a cross-flow low-temperature cooler, and

Fig. 21a

a corner section of the heat exchanger module according to Fig. 21 ,

Fig. 1 shows a mounting assembly, ie a preassembled unit 1, consisting of a coolant radiator 2 and a refrigerant condenser 3 for a motor vehicle, not shown. The coolant radiator 2 can be connected to a coolant circuit, not shown, of an internal combustion engine of the motor vehicle and the refrigerant condenser 3 to a refrigerant circuit of a motor vehicle air conditioning system. The coolant radiator, hereinafter referred to as radiator 2, is designed as a downflow radiator, ie it has-which is not visible in this illustration-vertically extending coolant pipes which open into an upper coolant reservoir 4 and a lower coolant reservoir 5. Both Coolant boxes 4, 5 are made of plastic and each mechanically connected to a metallic tube sheet 6, 7. The radiator 2 has laterally in each case between the two coolant boxes 4, 5 vertically arranged side parts, of which only in the drawing left side part 8 is visible. In front of the coolant cooler 2, the condenser 3 designed as a cross-flow capacitor is arranged, ie it has horizontally extending tubes 9 which open into a collection tube 10 arranged on the left in the drawing and a collecting tube 11 arranged laterally on the right, to which a collection container 12 arranged in parallel is connected , Between the tubes 9, which are formed as flat tubes, not shown corrugated fins are arranged, which together with the flat tubes 9 form a capacitor network 13. Above the net 13, a side part 14 is arranged, a same side part is arranged on the bottom (not visible). The entire capacitor 3 consists of aluminum parts, which are soldered to each other.

At the upper and at the lower coolant box 4, 5 (also called manifolds) are in the region of the narrow sides in the direction of the capacitor 3 overhanging holder 4a, 4b, 5a, 5b molded, d. H. formed integrally with the plastic boxes 4, 5. About this überkragenden holder 4a, 4b, 5a, 5b, the capacitor 3 is connected to the radiator 2, which will be explained in more detail below. With regard to the mounting options of both heat exchangers 2, 3 is to be noted that parallel to the coolant boxes 4, 5 and adjacent to each side of the 14 parts of the capacitor 3 and parallel to the side panels 8 of the radiator, the manifolds 10, 11 of the capacitor 3 are arranged. The following embodiments are therefore directed essentially to how between these adjacent parts a simple connection between the two heat exchangers 2, 3 can be produced

Fig. 2 shows a lower corner of the in Fig. 1 illustrated unit 1 with condenser 3 and 2 radiator - it will be the same reference numerals for the same parts as in Fig. 1 used. At the manifold 10, a connection flange 15 is additionally arranged and attached for the connection of refrigerant lines, not shown. Further, the side part 8 of the radiator is the second recognizable, which is connected to the lower tube plate 7, in particular soldered. The projecting on the lower coolant box 5 overhanging holder 5a is hook-shaped and overlaps the tube sheet 7. The manifold 10 of the condenser 3 - the same applies to the second manifold 11 (see. Fig. 1 ) - is supported on the front side on the holder 5a and is fixed by this.

Fig. 3 shows an upper left corner portion of radiator 2 and condenser 3 before their connection with each other. At the upper coolant box 4 of the overhanging holder 4a is molded, which serves to fix the left manifold 10 of the capacitor 3. Above the coolant box 4, a clip or clamping element 16 is shown, which is inserted into the holder 4a. Below the tubesheet 6 are coolant tubes 17 can be seen, which extend in the vertical direction, ie transverse to the tubes 9 of the capacitor 3. The coolant tubes 17 are preferably formed as flat tubes, between which are not shown corrugated fins, which are soldered together with the flat tubes 17, the side parts 8 and the tube sheets 6, 7 to form a block; Subsequently, the plastic boxes 4, 5 with the tube plates 6, 7 (see. Fig. 1 ) connected.

Fig. 4 shows the in Fig. 3 illustrated connection in the assembled state. It can be seen that the clip 16 inserted in the holder 4a fixes the collecting tube 10. At the same time a certain length compensation between cooler and condenser is possible.

Fig. 5 shows another possible connection between the radiator 2 and the condenser 3, namely at the lower coolant box 5. The latter has a modified molded, also overhanging holder 18 with integrated locking elements 18a, 18b, 18c. The condenser 3 has a lower side part 19 with an L-shaped cross section and a receiving opening 19a into which the middle detent element 18b can be inserted, while the adjacent detent elements 18a, 18c effect a further fixation. The capacitor 3 is thus pushed from top to bottom on the holder 18 and is mounted in this direction. An appropriate attachment is provided on the right, not shown side of the lower coolant box 5.

Fig. 6 shows that too Fig. 5 belonging upper connection between the upper coolant box 4 and a fixed to the capacitor 3, L-shaped upper side part 20 with an expression 20a. On the coolant box 4, an overhanging holder 4c is injection-molded, which is offset somewhat further in the direction of the radiator center, since it interacts with the expression 20a of the side part 20 by means of an additional clamping element 21 (clip).

Fig. 7 shows a further attachment possibility between the upper coolant box 4 and the (flat) side part 14 (see. Fig. 1 ) of the capacitor 3. On the side part 14, a U-shaped tab 14a is provided which cooperates with the molded-on overhanging holder 4d-together and thus establishes a connection between the two heat exchangers 2, 3.

Fig. 8 shows a further embodiment of the connection of the downdraft cooler 2 and the cross-flow capacitor 3 in the preassembled state. The side part 8 has a protruding in the direction of the capacitor 3 tab 22 with V-shaped, issued flaps 22a, 22b, 22c. The tabs 22a, 22b, 22c form contact surfaces for the manifold 10. The tab 22 is preferably formed integrally with the side part 8.

Fig. 9 shows the connection according to Fig. 8 in the finished state, wherein the collecting tube 10 is soldered to the tab 22 and its tabs 22a, 22b, 22c. Since in the illustrated embodiment, the coolant box 4 is formed of plastic, the soldering of capacitor 3 is carried out with the block of the radiator 2 before mounting the coolant box. 4

Fig. 10 shows a further embodiment of the connection of the downdraft cooler 2 and the cross-flow capacitor 3. The manifold 10 of the capacitor 3 is formed in two parts, ie it consists of a cover part 10a and a bottom part 10b, which is integrally formed with the side part 8 of the radiator 2. This results in a fixed one after soldering Connection between both heat exchangers 2,3. In the transition region between manifold 10 and side panel 8 notches 24 are provided in the form of windows to compensate for different strains between the radiator 2 and capacitor 3.

Fig. 11 shows that in Fig. 10 shown lateral part 8, which forms a one-piece integration part 23 with the bottom part 10b of the manifold 10, wherein the bottom part 10b merges into the side part 8 via a bead 23a. This results in an approximately S-shaped cross section in the transition region. In the region of the bead 23a, the notches 24 are arranged in the form of issued flaps. An analogous connection is provided on the other not shown side of the condenser or cooler.

Fig. 12 shows a further embodiment of a connection between the side part 8 of the radiator 2 and the manifold 10 of the capacitor 3. The side part 8 has a punched-slot 25, in which a holder 26 attached to the manifold 10 can be inserted and soldered. Thus, the block of the radiator 2 and the condenser 3 can be fixedly connected to each other by a solder joint. Also, a pure plug connection between the holder 26 and slot 25, that would be possible without soldering.

Fig. 13 shows a further embodiment of a connection between the downdraft cooler 2 and the cross-flow capacitor 3 by means of a collection tube 10 of the capacitor 3 arranged on the front side extension 27, which acts as a holder for the condenser 3. At the upper coolant box 4 molded mounting brackets 28 are arranged, which include the holder 27 and thus connect the capacitor 3 to the radiator 2. Analog connections are provided at the other three corners. The capacitor 3 thus needs to be pressed against the radiator 2 only from the front and is thus fixed.

Fig. 14 shows an embodiment of the invention for connecting the downdraft cooler 2 and the cross-flow capacitor 3, wherein here an additional, standardized connecting element 29 is provided for each corner area of both heat exchangers 2, 3. On the connecting element 29 made of plastic, a flat tongue 29a is molded with locking lugs 29b and longitudinal slots 29c. On the coolant box 4 of the radiator 2 protruding locking elements 30 are molded, which engage in the longitudinal slots 29c of the connecting element 29 and this lock with the Kühlmittetkasten 4. On the other hand, the connecting element 29 has a U-shaped profile 29d, which is adapted to the corner region of the capacitor 3, in particular the collecting tube 10 and this can engage positively and non-positively.

Fig. 15 shows the lower corner region of the downdraft cooler 2 and the cross-flow capacitor 3 with the same connecting element 29, which is here rotated by 180 degrees, ie the tongue 29a points downward. The lower coolant box 5 has on its longitudinal side on a molded bracket 31, in which the tongue 29a can be inserted up to the locking lugs 29b.

Fig. 16 shows the connection between the radiator 2 and capacitor 3 for the upper corner area in the assembled state. The latching elements 30 pass through and lock into the tongue 29a on the coolant box 4, while the connecting element 29 with its U-shaped profile 29d surrounds and holds the corner area of the capacitor 3. This connection between the two heat exchangers 2, 3 allows a relative movement in the vertical direction due to the longitudinal slots 29c (floating bearing).

Fig. 17 shows the assembled connection for the lower corner region between the coolant box 5 and capacitor 3, wherein the tongue 29a is held in the bracket 31 and rests with the locking lugs 29b on the edge of the bracket 31. This fixation is achieved downwards, while in the upper attachment according to Fig. 16 , as mentioned, an expansion in the vertical direction is possible.

For the four corner areas of the radiator 2 and capacitor 3 are so - as in the FIGS. 14 to 17 shown - same connecting elements 29 used, which are thus formed as equal parts.

Fig. 18 and Fig. 18a show a further embodiment, soft a modification of the attachment between the side part and the manifold according to FIGS. 8 and 9 represents. The same reference numbers are used for the same parts. The radiator 2 according to Fig. 18 has a side part 81 which bears against the radiator block and is pushed under the tube sheet. About this side part 81 of the capacitor 3 is fixed by means of its manifold 10 on the radiator 2 by soldering.

The side part 81 is as an item in Fig. 18a shown and has inwardly, ie directed toward the radiator block, bent or folded tabs 81 a, wherein in the region of the fold longitudinal slots 81 b are arranged. Furthermore, 81 longitudinal slots 81 c are arranged approximately centrally in the end regions of the side part. The bent tabs 81 a serve as a holder for the manifold 10, which is applied to the holder 81 a and soldered. Thus, the radiator block with side part 81 and the condenser 3 with manifold 10 form a soldered block. Due to the different thermal expansion of radiator and condenser block arise relative movements, which are collected by the longitudinal slots 81 b and 81 c or reduced to an acceptable level. The longitudinal slots 81 c serve at the end of the side part 81 of the reduction of high voltages in the side part / tube bottom connection. The number of acting as a holder flap 81 a is at least two, preferably three to four.

Fig. 19 and Fig. 19a show a further modified embodiment of a material connection between the side part of the radiator and the manifold of the condenser, again with the same reference numerals for the same parts are used. The cooler 2 has a side part 82 pushed under the tube plate, which rests against the block of the cooler 2 and is soldered to it and to the tubesheet. The condenser 3 is soldered via its manifold 10 to the side part 82 of the radiator 2.

Fig. 19a shows the side part 82 as a single part, arranged on one of its longitudinal side as forks 82a formed holder and integrally with the side part 82 (sheet metal part) are formed. The forks 82a are punched out of a sheet metal blank, not shown, and folded several times, wherein between the fork 82a and the side part 82 a resilient web is left, which is limited by lateral notches 82d. This gives the forks 82a, which are connected via these webs or tongues with the side part 82, a certain elasticity transverse to the longitudinal direction of the side part 82. Between the forks 82a side limbs 82b are bent, which cause a stiffening of the side part 82. At the two ends, which are pushed under the tubesheet, longitudinal slots 82c are arranged approximately centrally, which reduce excessively high bending stresses in the region of the side part / tube bottom connection. The collecting tube 10 is placed on the forks 82a or fork tips and soldered in a soldering device, not shown. Thus, both blocks are soldered to a common block, after completion of the solder joint expansion or contraction possibility of the tubes of the capacitor 3 due to the resilient arrangement of the forks 82a is possible - the forks 82a thus fulfill the function of strain beads.

The above-described arrangements of two heat exchangers each form a so-called heat exchanger module or a cooling module, provided that the heat exchangers are designed as a cooler and as a capacitor. The cooling module is installed as a prefabricated unit in the vehicle and can also support other heat exchangers, eg. As a charge air cooler and / or accessories, z. B. a fan cowl with fan.

Fig. 20 shows as a further embodiment, a brazed heat exchanger module 40, which is composed of a cross-flow condenser 41 and an oil cooler 42. The condenser 41 has two manifolds 43, 44 and an upper side part 45 (a lower side part is also provided, but not visible). The side part 45 of the capacitor 41 corresponds in its training as the side part 82 according to Fig. 19 or 19a, where it is used for a coolant radiator. The side part 45 has two integrated fork-shaped holder 46, 47 for soldering with the oil cooler 42 on. Corresponding holders, not shown, are provided on the lower non-visible side part. The oil cooler 42 is constructed as Flachrohrölkühler and has two manifolds 48, 49, to which the integrated holder 46, 47 come to rest.

Fig. 20a shows an upper section of the heat exchanger module 40, wherein the fork-shaped, with the side part 45 integrated holder 46, 47 are clearly visible. The collecting box 49, which is designed here as a pipe (with unmarked oil connection pieces), abuts against the fork-shaped holders 46, 47 and is soldered to them. Due to the elastic design of the holders 46, 47 relative movements between the two heat exchangers 41, 42 can be at least partially compensated.

Fig. 21 shows as a further embodiment, a brazed heat exchanger module 50, which has on the one hand designed as a downdraft cooler main coolant radiator 51 and on the other hand designed as a cross-flow cooler low-temperature coolant cooler 52. Both coolant radiators are integrated into a coolant circuit, not shown, of an internal combustion engine and connected in series on the coolant side, so that the coolant in the low-temperature radiator 52 can be cooled below the temperature of the main radiator 51. As seen in the air flow direction, the low-temperature radiator 52 is arranged in front of the main radiator 51. The low-temperature coolant cooler 52 is designed as a Ganzaluminiumwärmeübertrager, ie it has aluminum collecting boxes 53, 54 on. In contrast, the main cooler 51 can be designed as a whole aluminum heat exchanger or - as shown in the drawing - have collection boxes 55, 56 made of plastic, which are connected to tube plates 57, 58 made of aluminum. The main cooler 51 has two side parts, of which only the left side part 59 is visible. The side part 59 is pushed end under the two tube sheets 57, 58 and is similar to the side part 82 according to Fig. 19, 19a educated. It thus has integrated fork-shaped holder 60 which come to the aluminum box 54 to the plant and form a solder joint with this.

Fig. 21a shows a section of the cooling module 50, wherein the corner region of the low-temperature radiator 52 is omitted for the purpose of exposing the fork-shaped holder 60. It can be seen from this illustration that between the side surface of the collecting tank 54 and the fork-shaped holder 60, a good contact surface results, which ensures a perfect soldering. In order for a cohesive connection of the two heat exchangers 51, 52 is achieved to a brazed heat exchanger module. Any relative movements between the two heat exchangers can be at least partially compensated by the elastic design of the integrated holder 16 - as described above in connection with FIG Fig. 19, 19a is described.

Claims (8)

1. An arrangement of two heat exchangers with an arrangement for mutual fastening of the two heat exchangers, which each comprise a network comprising tubes and ribs and also collecting tanks or collecting tubes on either side of the network and fastening means for mutual mounting, wherein the tubes of the first heat exchanger and the tubes of the second heat exchanger are arranged crosswise relative to one another and the collecting tanks of the first heat exchanger are arranged offset by 90 degrees with respect to the collecting tubes of the second heat exchanger, wherein the fastening means for mutual mounting as additional connecting elements (29) are formed as detent elements, which are produced from plastic and can be clipped to the collecting tanks (4, 5) of the first heat exchanger (2), and the connecting elements (29) have a receiving profile (29d) adapted to a collecting tube of the second heat exchanger (3) and receiving the collecting tube, and the connecting elements (29) are arranged at all four corner regions of the first heat exchanger (2) and of the second heat exchanger (3).
2. The arrangement according to claim 1, characterised in that the first heat exchanger (2) has side parts (8) and the second heat exchanger (3) has two-part collecting tubes (10), consisting of a top part (10a) and base part (10b), and in that the side part (8) of the first heat exchanger (2) and the base part (10b) of the second heat exchanger (3) are formed integrally.
3. The arrangement according to claim 2, characterised in that the side part (8) and the base part (10b) are formed as an integration part (23) with S-shaped cross section.
4. The arrangement according to claim 3, characterised in that the integration part (23) has recesses (24) for compensating for thermal expansions.
5. The arrangement according to one of the preceding claims, characterised in that the connecting elements are formed as identical parts (29).
6. The arrangement according to at least one of the preceding claims, characterised in that the first heat exchanger is formed as a downdraft cooler (2) and the second heat exchanger is formed as a cross-flow condenser (3).
7. The arrangement according to at least one of the preceding claims, characterised in that the first heat exchanger is formed as a cross-flow condenser (41) and the second heat exchanger is formed as an oil cooler (42).
8. The arrangement according to at least one of the preceding claims, characterised in that the first heat exchanger is formed as a downdraft and primary coolant cooler (51) and the second heat exchanger is formed as a cross-flow and low-temperature coolant cooler (52).

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