SE1350413A1 - Radiator arrangement in a motor vehicle - Google Patents

Abstract

The present invention relates to a radiator arrangement for a vehicle (1). The radiator arrangement comprises a first radiator (3) which comprises an inlet tank (3a) for receiving a first medium to be cooled, a cooling portion (3b) where the first medium is cooled by air flowing through the cooling portion (3b) and an outlet tank (3c) where the cooled first medium is discharged from the first cooler (3), and a second cooler (4) comprising an inlet tank (4a) for receiving a second medium to be cooled, a cooling portion ( 4b) where the second medium is cooled by air flowing through the cooling portion (4b) and an outlet tank (4c) where the cooled second medium is led out of the second cooler (4). The first radiator (3) and the second radiator (4) form separate units. The first cooler (3) comprises a tubular element (12, 14) extending through at least one of the tanks of the first cooler (Ba, 3c), said tubular element (12, 14) being adapted to articulate the second medium between a side of the first the cooler tank (3a, 3c) and an opposite side of the first cooler tank (3a, 3c) where the second cooler (4) is arranged. (rig. sa)

Description

WO 2008/019117 discloses a heat exchanger for cooling media at different temperatures.

The heat exchanger is designed in one piece with an inlet tank, an outlet tank and a radiator section extending between the tanks. A longitudinal partition is arranged in the respective tanks so that separate parts are created for the respective media. In one embodiment, one of the media is led to a part of the tank via a pipe extending through the other part of the tank. The two indies are separated only by a relatively thin dividing wall in the respective tanks. Since the partition wall has a relatively large surface area, there will be a non-negligible heat transfer, via the partition wall, between the media in the respective tanks. This results in the heat exchanger becoming inefficient if it is sought that the media with the different inlet temperatures should also show a marked temperature difference when they leave the heat exchanger.

SUMMARY OF THE INVENTION The object of the present invention is to provide a radiator arrangement for cooling media with different temperatures where the radiator arrangement requires a relatively small installation space in a vehicle while providing an efficient cooling of the media. This object is achieved with the radiator arrangement of the kind mentioned initially. which is characterized by the features stated in the characterizing part of claim 1.

The cooler arrangement thus comprises two separate coolers for cooling media with different temperatures. The first radiator comprises a tubular element extending through the inlet tank or outlet tank of the first radiator. The tubular element is adapted to guide the second medium between one side of the tank of the first cooler and an opposite side of the tank of the first cooler where the second cooler is arranged. Thus, in this case, the medium does not need to be led in a pipeline extending around the first cooler. Thus, no space needs to be saved next to the first radiator for laying such a pipeline. As a result, the coolers can be made wider and given a larger capacity.

Alternatively, the space next to the radiators can be used by other components in the vehicle.

According to an embodiment of the present invention, the tanks and the cooling portion of the first cooler are arranged at a distance from the tanks and cooling portion of the second cooler. Direct contact between the coolers results in heat being transferred by heat conduction into the contact surfaces. Since coolers are made of materials with good heat-conducting properties, direct contact between the coolers should be avoided as much as possible, at least if it is sought to maintain a temperature difference between the media even after they leave the coolers. Air has good heat-insulated properties. It is usually sufficient to place the coolers at a relatively short distance from each other to reduce the heat exchange between the media in the coolers to an acceptably low level.

According to an embodiment of the present invention, the second cooler comprises a second pipe element arranged in an inlet tank or an outlet tank, which second pipe element is adapted to be connected to the pipe element of the first cooler so that they form a continuous pipe for the second medium and that the cooler arrangement comprises at least a connecting member adapted to releasably connect the tubular member of the first radiator to the tubular member of the second radiator. In order to lead the medium to or from one of the tanks in the second cooler, it is suitable that the tank comprises at least one shorter pipe element. By means of a pipe element in the first cooler and a pipe element in the second cooler, it is relatively easy to create a continuous pipeline which leads the medium to and from a tank in the second cooler. Said connecting means can be applied in a place where it is obligatory to establish a releasable connection between the coolers. It can be applied so that it releasably connects the tank of the first cooler in a position relative to the tank of the second cooler in which position the pipe elements create said continuous pipe. Alternatively, the connecting means can be applied to the tubular elements and establish a direct connection between the tubular elements in the respective coolers.

According to an embodiment of the present invention, the tubular elements are made of rigid materials which in a connected state create a suspension member with which one cooler can be supported by the other cooler. The pipe elements here create a rigid pipeline that holds the coolers together in a specific position in relation to each other.

It is thus sufficient to, for example, attach the first radiator to the vehicle as it has the capacity to support the second radiator. The loading of the coolers is thus simplified at the same time as the space for attaching the coolers can be made smaller. The pipe element can be made of a suitable metal material. The pipe elements can be made of the same material as the material in the respective tanks.

According to an embodiment of the present invention, the tubular element of the first cooler and the tubular element of the second cooler have a corresponding internal cross-sectional area for conducting the second medium. In this case, the end faces of the pipe elements are connected to each other and a continuous pipe is created with a constant internal cross-sectional area in a longitudinal direction. The end surfaces can be connected directly to each other or via an intermediate sealing element such as a gasket. Alternatively, the tubular elements of the first radiator and the tubular elements of the second radiator may have different sizes, a part of the smaller of said tubular elements being adapted to be applied inside the larger of said tubular elements. In this case, the longitudinal contact surfaces of the tubular elements are prevented from moving the tubular elements and the coolers relative to each other in all directions except in the direction in which the tubular elements are pushed in and out of each other. Movements in this direction can be prevented in a mounted condition by means of one or more relatively simple test means which hold the coolers together.

According to an embodiment of the present invention, the pipe element of the first cooler or the pipe element of the second cooler comprises a projecting portion which projects a distance from the tank of the cooler. Such a projecting portion of a tubular element can define the distance between the first cooler and the second cooler in connection with said tank. Optionally, both pipe elements can protrude a suitable distance from the tank where they are arranged. With two such projecting portions, the coolers can be arranged at a predetermined distance from each other in a simple manner.

According to an embodiment of the present invention, the tank of the first cooler comprises a locally larger external dimension in an area where said moving element extends through the tank. The internal volume of the tank is reduced in the area where the pipe element is arranged. By giving the tank a locally larger external dimension in this area, the first medium can obtain an equally large internal space in this area of the tank as in other areas of the tank.

According to an embodiment of the present invention, the inlet tank of the first cooler is arranged substantially immediately downstream of the inlet tank of the second cooler and that the outlet tank of the first cooler is arranged substantially immediately downstream of the outlet tank of the second cooler in an air passage with respect to the intended flow directions. In this case, the cooling unit has the same width. The pipe elements of the respective tanks that create the continuous pipeline between the tanks can here be made rather short.

According to another embodiment of the invention, the radiator arrangement 10 comprises a sealing element which is adapted to create a tight connection between the tube element of the first radiator and the tube element of the second radiator. To prevent leakage, it is in most cases. necessary to apply a sealing element in a suitable place in a connecting area between the pipe elements. The sealing element can be, for example, a gasket, an O-ring or a tubular sealing element.

BRIEF DESCRIPTION OF THE DRAWINGS In the following, exemplary embodiments of the invention are described by way of example with reference to the accompanying drawings, in which: Fig. 1 Figs. 2 Pig. 3a shows a section in the plane A-A in Pig. 2, Fig. 313 shows a section in the plane B-B in Fig. Fig. 4a shows a section through the inlet tanks according to a second embodiment of shows a radiator arrangement according to the present invention seen from above, shows the radiator arrangement in Fig. 1 seen from behind, the radiator arrangement, Fig. 4b shows a section through the outlet tanks according to the second embodiment of the radiator arrangement Fig. 5a shows a section through the inlet tanks according to a third embodiment of the radiator arrangement and Pig. Sb shows a section through the outlet planks according to the third embodiment of the radiator arrangement.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION Fig. 1 schematically shows a vehicle 1 driven by an internal combustion engine 2. A first radiator 3 and a second radiator 4 are provided in an air passage 5 at a front portion of the vehicle 1. cooling a coolant that cools the internal combustion engine and circulates in a high-temperature cooling circuit in the vehicle 1. The second cooler 4 is intended to cool a coolant circulating in a low-temperature cooling circuit in the vehicle 1. The coolant in a low-temperature cooling circuit has a lower cooling temperature in most operating conditions. . An air flow 6 is created through the air passage 5 and through the coolers 3, 4 by means of a coolant fl gen 7 and the vehicle's in speed wind. The second cooler 4 is arranged in a position upstream of the first cooler 3 with respect to the intended direction of flow of air through the air passage 5. The first cooler 3 and the second cooler 4 are substantially flat and they are arranged in parallel planes in the air passage 5. The air flow in the air passage 5 takes place mainly in a perpendicular direction in relation to the planes of the coolers 3, 4. The first cooler 3 and the second cooler 4 constitute two separate units which are releasably connectable to each other by means of one or more fastening means S. In this case, four fastening means 8 are used, each of which comprises a screw which connects a respective projecting portion of the first cooler 3 with a projecting portion of the second cooler 4. The fastening means 8 can have a substantially arbitrary but functional design. The first radiator 3 comprises fastening element 9 with which the first radiator 3 can be fixed in a frame construction 10 in the vehicle 1 by means of screws, bolts, etc. The fastening element 9 can also have a substantially arbitrary but functional design.

Fig. 2 shows the first cooler 3 in more detail. The first cooler 3 comprises an inlet tank 3a which is provided with a first moving element 11 with an opening for receiving coolant in the high-temperature cooling circuit which cools the combustion engine 2.

The first tubular element 11 is adapted to be connected to a coolant hose in the high-temperature cooling circuit. The first pipe element 11 is in this case arranged at an upper part of the inlet tank 3a. The first cooler 3 comprises a second tubular element 12 with an opening for receiving coolant in the low temperature cooling circuit. The second moving element 12 is adapted to be connected to a coolant hose in the low temperature cooling circuit.

The second pipe element 12 extends through the inlet tank 3a in a central area 3a1 of the inlet tank 3a. The inlet tank 3a has a larger width in the area 3a1 than in other parts. The first cooler 3 comprises a cooling portion 3b where the coolant in the high temperature cooling circuit is cooled by air in the air passage 5. The coolant is led in the cooling portion 3b through elongate horizontal tubular elements 3b1 which are arranged at constant distances from each other. A cooling air stream is adapted to flow through the cooling portion 3b in the passages between the tubular elements 3b1. Heat transfer means 3b2, which may be called tendrils, are arranged in said passages to increase the contact surface of the air with the tubular element 3191 so that the coolant provides a more efficient cooling in the tubular elements 3b1. The heat transfer means 3b2 may be made of sheet material having a zigzag shaped structure.

The heat transfer means 3112 can thus divide the passages between adjacent tubular elements 3b1 into a large number of solder channels. The first cooler 3 also comprises an outlet tank 3c where the coolant is received after it has been cooled in the cooling portion 3b. The first cooler 3 comprises a third pipe element 13 with an opening for discharging coolant from the first cooler 3. The third pipe element 13 is adapted to be connected to a coolant hose in the high temperature cooling circuit. The third pipe element 13 is arranged at an upper part of the outlet tank 3c. The outlet tank 3c also comprises a fourth pipe element 14 with an opening for discharging coolant to the low-temperature cooling circuit. The fourth pipe element 13 is adapted to be connected to a coolant hose in the low-temperature cooling circuit. The fourth pipe element 14 extends through the outlet tank 3G at a centrally arranged area 301 which has a larger width than the outlet tanks 3c in general.

The second cooler 4 comprises an inlet tank 4a with a fifth pipe element 15 which is connected to the second pipe element 12 of the inlet tank 3a of the first cooler.

The pipe elements 12, 15 form in a connected state a pipeline which carries coolant from the low temperature cooling circuit to the inlet tank 4a. The second cooler 4 comprises a cooling portion 4b where the coolant in the low-temperature cooling circuit is cooled by air flowing through the cooling portion 4b. The coolant is led in the cooling portion 4b through elongate tubular elements 4b1 which are arranged at a distance from each other. Heat transfer means 4192 are arranged in said passages to increase the contact surface of the air with the tubular element 4b1 so that the cooling liquid provides a more efficient cooling in the tubular elements 4b1. The heat transfer means 4192 has a zigzag shaped structure which divides the passages between adjacent tubular elements 4b1 into a large number of flow channels. The second cooler 4 comprises an outlet tank 4c with a sixth pipe element 16 which is adapted to be connected to the fourth pipe element 14 of the first cooler 3. The pipe elements 14, 16 form in a connected state a pipe conduit which discharges coolant from the outlet tank 4c.

The inlet tank Ba of the first cooler is arranged substantially immediately downstream of the inlet tank 4a of the second cooler, the cooling portion 31 of the first cooler is arranged substantially immediately downstream of the cooling portion 4b of the second cooler and the outlet tank 3c of the first cooler is arranged substantially downstream of the second cooler 4c. The first radiator 3 and the second radiator 4 in this case have the same width. The cooling air flow in the air passage 4 first passes through the cooling portion 4b of the second cooler and then through the cooling portion 3b of the first cooler. The air provides a temperature increase as it cools the coolant in the cooling portion 4b of the second cooler. Thus, the air obtains a higher temperature as it cools the coolant in the cooling portion 3b of the first cooler 10 '15. As a result, the coolant in the low temperature cooling circuit cools to a lower temperature than the coolant in the high temperature cooling circuit.

Fig. 3a shows a vertical section in the plane AA through the inlet tanks Ba, 4a in Fig. 2. It can be seen here that the second pipe element 12 extends through the inlet tank 3a from a connecting portion 12a for connection of a coolant hose on one side of the inlet tank 3a to an end surface 12b on an opposite side of the inlet tank 3a. The end surface 12b is arranged in the same plane as an outer surface of the inlet tank 3a. The inlet tank 4a of the second cooler comprises a fifth pipe element 15 which has a projecting portion with an end surface 15a. The end surface 12a of the second pipe element is adapted to be mounted against the end surface 15a of the fifth pipe element with an intermediate gasket 17. By means of the fastening means 8 the first cooler inlet tank Ba and the inlet tank 4a of the second cooler are pressed against each other to create a tight connection between the second the end surface l2a of the tube element, the gasket l? and the end surface l5a of the fifth moving element. The second pipe element 12 and the fifth pipe element 15 have a corresponding internal cross-sectional area. Thus, the second pipe element 12 and the fifth pipe element 15 create a continuous pipe with a continuous internal cross-sectional area through which the coolant in the low-temperature cooling circuit is led to the inlet tank 4a of the second cooler.

The distance between the inlet tanks 3a, 4a of the coolers 3, 4 is defined in this case by the distance which the fifth pipe element 15 projects from the inlet tank 4a of the second cooler.

Fig. 3b shows a vertical section in the plane B-B through the outlet tanks 3a, 4c in Fig. 2. The fourth pipe element 14 extends through the outlet tank. 3c from a connection portion 14a for connecting a coolant hose on one side of the outlet tank 3G to an end surface 14b on an opposite side of the outlet tank 30. The end surface 14b is arranged in substantially the same plane as the outer surface of the outlet tank 30. The second cooler outlet tank 4c comprises a sixth tubular member 16 having a projecting portion with an end face 16a.

The end surface 14a of the fourth tubular element is adapted to be mounted against the end surface 16a of the sixth tubular element with an intermediate gasket 17. By means of the fastening means 8 the first cooler outlet tank 3a and the second cooler outlet tank 4a are pressed together to create a tight connection between the fourth tubular element end face 14a, the gasket 17 and the end face 16a of the sixth tubular member. The fourth pipe element 14 and the sixth pipe element 16 have a corresponding internal cross-sectional area. Thereby, the fourth pipe element 14 and the sixth pipe element 16 create a pipeline with a continuous internal cross-sectional area through which coolant is led out of the outlet tank 4c to the low temperature cooling circuit. The distance between the outlet tanks 3c, 40 of the coolers 3, 4 is defined by the distance which the sixth pipe element 1 projects from the outlet tank 4a of the second cooler.

Fig. 4a shows a corresponding section as in Fig. 3a for an alternative embodiment. The second pipe element 12 extends through the inlet tank 3a from a connecting portion 12a for connecting a coolant hose on one side of the inlet tank Ba to an end surface 1213 on an opposite side of the inlet tank 3a. The end surface 12b is arranged on a projecting portion and thus at a distance from an outer surface of the inlet tank 3a.

The inlet tank 4a of the second pipe comprises a fifth pipe element 15 which has an end surface 15a which is arranged on a projecting portion. The fourth tube element 15 has an outer diameter which substantially corresponds to an inner diameter of the second tube element 12. The fifth tube element 15 comprises an externally arranged annular recess for application of an O-ring 18. In this case the fifth tube element 15 is pushed with O- the ring 18 into the second pipe element 12 until the end surface 12b of the second pipe element comes into contact with an outer surface of the inlet tank 4a of the second cooler. In the mounted condition, the ring 18 corresponds to coolant not leaking in the connection area between the pipe elements 12, 15. The distance between the inlet tanks 3a, 4a of the coolers 3, 4 de nierasi in this case of the distance that the second pipe element 12 protrudes from the first radiator inioppstank 3a.

Fig. 4b shows a corresponding section as in Fig. 3b for the alternative embodiment. The fourth pipe element 14 extends through the outlet tank 3c from a connecting portion 14a for connecting a coolant hose on one side of the outlet tank 3c to an end surface 1413 on an opposite side of the outlet tank 30, the end surface 1413 is arranged on a projecting portion and thus at a distance from an outer surface of the outlet tank 3c. The outlet tank 4c of the second cooler comprises a sixth pipe element 16 having an end surface 16a located on a projecting portion and thus at a distance from an outer surface of the outlet tank 4c. The sixth tube member 16 has an outer diameter that substantially corresponds to the inner diameter of the fourth tube member 14. The sixth tubular member 16 includes an externally arranged annular recess for applying an O-ring 18. In this case, the smaller sixth tubular member 11 is pushed into the larger fourth tubular member 14 until the end surface 14b of the third tubular member contacts an outer surface of the outlet tank 4c. In the mounted state, the O-ring 18 is responsible for ensuring that coolant does not leak into the connection area between the pipe elements 14, 16. The distance between the outlet tanks 3c, 40 of the coolers 3, 4 10 15 20 25 30 35 is defined in this case by the distance as the fourth the tube element 14 projects from the outlet stem 3c of the first cooler.

Fig. 5a shows a corresponding section as in Fig. 3a for a further alternative embodiment. The second pipe element 12 extends through the inlet tank 3a from a connection portion 12a for connecting a coolant hose on one side of the inlet tank 3a to an end surface 1213 on an opposite side of the inlet tank 3a. The end surface 12b is arranged on a projecting portion and thus at a distance from an outer surface of the inlet tank 3a. The inlet tank 4a of the second cooler comprises a fifth pipe element 15 which has an outer end surface 15a which is adapted to come into contact with the end surface 12b of the second pipe element. By means of the fastening means 8, the first inlet tank 3a and the inlet tank 4a of the second cooler are pressed against each other. The second pipe element 12 and the fifth pipe element 15 have a corresponding internal cross-sectional area. Thus, the second pipe element 12 and the fifth pipe element 15 create a continuous pipe line with a constant internal cross-sectional area in which the coolant in the low-temperature cooling circuit is led to the inlet tank 4a of the second cooler. The continuous pipeline comprises a tubular sealing member 19.

The sealing member 19 has a first end portion 19a which is adapted to sealingly abut an inner surface of the second tube relay 12 and a second end portion 9b which is adapted to sealingly abut against one. inner surface of the fifth tubular member 15. The tubular sealing member is movably disposed within the pipeline between a first outer position defined by a first stop surface 12c within the second tubular member 12 and a second outer position defined by a second stop surface 15bc within the fifth tubular member. 15.

The distance between the inlet tanks 3a, 4a of the coolers 3, 4 is defined in this case by the distance which the second pipe element 12 projects from the inlet tank 3a of the first cooler.

Pig. Sh shows a corresponding section as in Fig. 3b for the further alternative embodiment. The fourth tubular member 14 extends through the inlet tank 3a from a connection portion 14a for connecting a coolant hose on one side of the outlet stem 3c to an end surface 14b on an opposite side of the outlet tank 30. The end surface 14b is arranged on a projecting portion and thus at a distance from an outer surface of the outlet tank 30. The second cooler outlet tank 4c comprises a sixth pipe element 16 having an external end surface 16a adapted to come into contact with the end surface 1411 of the fourth pipe element. By means of the fastening means 8 the first cooler outlet tank 3c and the second the cooler outlet tank 4c against each other. The fourth tube element 14 and the sixth tube element 16 have a corresponding internal cross-sectional area. Thereby, the fourth pipe element 14 and the sixth pipe element 16 create a pipeline with a continuous internal cross-sectional area through which coolant is led out from the outlet tank 4c of the second cooler to the low-temperature cooling circuit. The pipeline comprises a tubular sealing member 19. The sealing member 19 has a first end portion 19a which is adapted to abut against an inner surface of the fourth tubular member 14 and a second end portion 19b which is adapted to sealingly abut an inner surface of the sixth tubular member 16. The tubular sealing member 19 is displaceably disposed within the pipeline between a first outer position defined by a first stop surface 140 inside the fourth tube element 14 and a second outer position defined by a second stop surface 16bc inside the sixth tube element 16. The distance between the chillers 3, 4 outlet tanks 3c, 4c are defined by the distance that the end surface 14b of the fourth pipe element projects from the outlet tank 3a of the first cooler.

According to the invention, the coolant in the low temperature cooling circuit is led to the inlet tank 4a of the second cooler via a pipeline 12, 15 which extends through the inlet tank Ba of the first cooler. Correspondingly, the coolant is discharged from the second cooler outlet tank 4c via a pipeline 14, 16 extending through the first cooler outlet tank 30. Thus, the low temperature coolant circuit which carries coolant to and from the second cooler 4 arranged in front of the first cooler 3 need not comprise coolant lines extending around the first cooler 3. Thus, no coolant lines need to be arranged next to the coolers 3, 4. With the inventive cooler arrangement either the coolers 3, 4 can be made wider and more efficient or the space next to the coolers can be used by others. components of the vehicle 1. A further advantage of the present invention is that the continuous pipe element 12, 14 can be used to support the second radiator 4 by means of the fastening means 8. Thus, the separate radiators 3, 4 form a continuous unit in a mounted position . Thus, it is sufficient to fasten the first cooler 3 by means of the test means 9 in the frame 10.

The acquisition is in no way limited to. the drawings show the embodiments but can be varied freely within the scope of the claims. In the embodiments described above, coolant is cooled in a high temperature cooling circuit and coolant in a low temperature cooling circuit in the coolers 3, 4. However, it is possible to cool other types of media in the coolers.

Claims (9)

10 15 20 25 30 35 12 Patent claims A radiator arrangement for a vehicle (1), the radiator arrangement comprising a first radiator (3) comprising an inlet tank (3a) for receiving a first medium to be cooled, a cooling portion (3b) where the first medium is cooled by flowing air. through the cooling portion (319) and an outlet tank (3c) where the cooled first medium is led out of the first cooler (3), and a second cooler (4) comprising an inlet tank (4a) for receiving a second medium to be cooled, a cooling portion (4b) where the second medium is cooled by air flowing through the cooling portion (4b) and an outlet tank (4c) where the cooled second medium is discharged from the second cooler (4), the first cooler (3) and the second the cooler (4) constitutes separate units, characterized in that the first cooler (3) comprises a pipe element (12, 14) extending through the inlet tank (3a) or outlet tank (3c) of the first cooler, said pipe element (12, 14) is adapted to guide the second medium between one side of the first cooler take nk (3a, 3c) and an opposite side of the first cooler tank (3a, 3c) where the second cooler (4) is arranged. Radiator arrangement according to claim 1, characterized in that the tanks (3a, 3c) of the first radiator and the cooling portion (Bb) are arranged at a distance from the tanks (4a, 4G) and cooling portion (4b) of the second cooler. Cooler arrangement according to claim 1 or 2, characterized in that the second cooler (4) comprises a second pipe element (15, 16) which is arranged in an inlet tank (4a) or an outlet tank (40) which second pipe element (15, 16) ) is adapted to be connected to the tubular elements (12, 14) of the first cooler so that they form a continuous pipe for the second medium and that the radiator arrangement comprises at least one connecting means (8) adapted to releasably connect the tubular elements (12, 12 of the first cooler). 14) with the second coolant stirrer element (15, 16). Radiator arrangement according to claim 3, characterized in that the tubular elements (12, 14, 15, 16) are made of rigid materials which in a connected state create a suspension member with which a radiator (3) carries the other radiator (4). Radiator arrangement according to Claim 3 or 4, characterized in that the tubular element (12, 14) of the first radiator and the tubular element (15, 16) of the second radiator have a corresponding internal cross-sectional area for conducting the second medium. 10 15 20 25 13 Radiator arrangement according to claim 3 or 4, characterized in that the tubular elements (12, 14) of the first radiator and the tubular elements (15, 16) of the second radiator have different sizes, a part of the smaller of said tubular elements 15, 16) being adapted to be applied inside the larger of said tubular elements (12, 14). Radiator arrangement according to any one of the preceding claims 3 to 6, characterized in that the tubular element (12, 14) of the first radiator or the tubular element (15, 16) of the second radiator comprises a projecting portion projecting from the radiator tank (3a, 30) , 4a, 40). The radiator arrangement g according to any one of the preceding claims, characterized in that the tank (3 a, 30) of the first radiator comprises a locally larger dimension in an area (3 a1, 301) where said tubular element (12, 14) extends through the tank ( 3a, 30). Radiator arrangement according to any one of the preceding claims, characterized in that the inlet tank (3a) of the first cooler is arranged substantially immediately downstream of the inlet tank (4a) of the second cooler and that the outlet tank (30) of the first cooler is arranged substantially immediately downstream of the outlet tank of the second cooler. 40) in an air passage (5) with respect to the intended direction of diffusion of air through the coolers (3, 4). lO. Radiator arrangement any of the preceding claims 3 to 10, characterized in that it comprises a sealing element (17, 18, 19) adapted to create a tight connection between the tubular element (12, 14) of the first radiator and the tubular element (15, 14) of the second radiator. 16).