FR2478551A1 - Controlled effect radiator for car - has thermostat controlled tilting mounting to reduce cooled area at higher speeds - Google Patents

Abstract

The controlled effect radiator for a car has the radiator pivotted about a transverse, horizontal axis (D) to present a variable cross sectional profile to the airstream. At higher speeds the radiator is set at a lesser angle to the airstream to maintain the coolant temperature. The amount of tilting is controlled by servo arms (12) linked to thermostats. The bottom and/or top edge of the radiator can be fitted with curved flaps (14) sliding over the lips of the air inlet opening so that when the radiator is tilted it also restricts the airflow opening. Additional air guidance flaps can be fitted on adjustable mountings in front of the opening.

Description

 The present invention relates to a radiator arrangement for motor vehicles, comprising a radiator arranged behind an air inlet opening in the front part of the bodywork and which is mounted so as to be able to pivot about a horizontal axis and is extending transversely to the direction of the step.

 Such a radiator arrangement is known from the German patent application published after examination NO Il 88 456. In this known arrangement, the radiator is provided on its two sides with two support arms which are articulated on the radiator and which allow to pivot the entire radiator forwards out of the engine compartment to facilitate access to this compartment and to the engine itself and to the auxiliary units. During operation, that is to say in operation, the radiator nevertheless extends in a vertical plane in front of the engine blocks.

 It is also known that radiators of internal combustion engines for motor vehicles have two particularly critical operating states, one of these operating states, namely idling or running at low speeds under full load, is decisive. for the sizing of the radiator, the mounting thereof, and the associated fan installation.

In this operating state, the air necessary for cooling must be discharged by the radiator fan installation or by the electric blower. In fast motion, on the other hand, radiators designed in this way are oversized because, in this case, the relative wind ensures a greater flow of cooling air.

 This is why it is also known (German utility model NO 13 83 799) to associate with the radiator shutters acting in the manner of a shutter, which can be actuated, from the driver's seat, by via cable or similar controls, so that the passage of air through the radiator for regulating the temperature of the cooling water is adjustable.

However, a drawback of these arrangements is that the movable louver in front of the radiator isolates relative wind from the partial regions of the radiator, so that when considering the entire surface of the radiator, high temperature gradients can appear in the radiator itself, gradients that lead to unwanted thermal voltages.

 At the present time, greater importance is attached than in the past, when designing motor vehicles, to the possibility of reducing fuel consumption and it has been determined, in this respect, that the value Cw which determines fuel consumption, in particular at high running speeds, is itself partly determined by the air flow through the radiator.

 In view of the above, the object of the invention is to slow the passage of air through the radiator at high running speeds in such a way that the drag coefficient of the vehicle is lowered without however appearing in the ventilation ( disadvantages that could compromise its efficiency.

 Starting from the fact that, in order to lower the CW value at relatively high operating speeds, the air intake section must be reduced, the invention resides in that the radiator, at relatively high operating speeds, can pivot, as the walking speed increases, by an increasing angle, to take an inclined or oblique position relative to a plane perpendicular to the direction of travel, and in this gu'u the means are linked auxiliaries, which reduce the inlet section of the air inlet opening as the pivot angle increases.With this arrangement, the Cw value is lowered at relatively high air flow velocities without , however, irregular ventilation of the radiator occurs, as it is only the projection of the active surface of the radiator in a plane perpendicular to the direction of travel that becomes smaller, while the entire radiator surface remains , as before ment, in the cooling air stream.

It is also advantageous that the auxiliary means, which serve to reduce the inlet section, be supplemented by other auxiliary means arranged in the form of air flow guide surfaces to ensure ventilation as uniform as possible. of the entire surface of the radiator. The inconveniences resulting from only partial ventilation of the radiator by the air passing through it are thus avoided.

 The radiator can be mounted around pivot axes arranged in various ways. The pivot axis can, for example, (seen in the direction of ventilation) pass through the middle of the radiator but it can also be provided, either on the upper edge of the radiator, or in a region below the middle of that -ci, or on its lower edge. In all cases, sealing and guiding surfaces can be associated with the upper edge and / or the lower edge, surfaces which are each adapted to the pivot radius and which close off the different zones which, during a pivoting movement. from the radiator, would be released.

 This arrangement ensures good guidance of the incoming cooling air. These sealing and guiding surfaces can also be supplemented by guiding surfaces provided laterally above the pivoting area of the radiator so that, whatever the position of the latter, flow passages of the The incoming cooling air is always available, passages which, during the pivoting of the radiator, lengthen correspondingly in certain sones but which always ensure a guiding of the air flow. It is also possible to have, in the air flow area provided between the air inlet opening and the pivoting radiator ;, other further guide surfaces which can be coupled with the movement of the radiator in such a way that 'they can rotate in the same direction of rotation as this one.

 This arrangement allows further improved ventilation of the entire surface of the radiator.

 Advantageous arrangements are obtained in the sense of the above embodiments by mounting the radiator around an axis which, seen in the direction of ventilation, passes through the middle of it and providing the auxiliary means under the form of sealing and guiding surfaces fixed on the upper edge or on the lower edge of the radiator. The shutter and guide plates can then advantageously be curved guide surfaces adapted to the pivoting radius with which other guide surfaces are fixed relative to the body and also adapted to the pivoting radius. relatively high, the radiator to rotate about its axis of pjvotementde such that its surface facing the ventilation air is offset in a plane inclined rearward in the direction of travel.

On the lower edge of the radiator can be arranged guide surfaces in the form of shutters, which can be pivoted into the air inlet section, while on the upper edge of the radiator are provided guide surfaces which, together with the guide surface fixed relative to the body, constitute deflection plates for the air flow. This arrangement also has the advantage that the cooling air, in the course of its flow path, is deflected downwards and can escape from the engine compartment (as it is known per se and as desirable) down or to the side,
The guide surfaces and the shutters can then also be produced in the form of bellows of variable length or of rollable membranes.

 In the embodiment, in which the radiator is mounted so as to be able to pivot in the vicinity of its upper water boot, it is advantageous to use its lower edge directly as a shutter reducing the inlet section of air and, in this case, the pivot axis of the radiator is advantageously provided at a distance from the air inlet opening but the lower edge of the radiator is then immediately adjacent to this opening, while at least in the In this area between the pivot axis and the upper side of the air intake opening, guide surfaces are provided which are capable of influencing the ventilation of the radiator extending obliquely. In this embodiment , there is provided, on the lower edge of the radiator, a closure strip extending towards the rear and adapted to the pivot radius, a strip which then reduces the air intake also in the region behind the radiator and thus helps to lower the v CW value of the vehicle at relatively high driving speeds.

 In this embodiment, it is particularly advantageous to produce the inner side of the cover in the form of a guiding surface. For the incoming flow of cooling air and to provide, in addition, in the region situated in front of the radiator arranged obliquely , air flow guide vanes or the like operable from the radiator. In this way the ventilation of the radiator can be uniform.

The third possibility of arrangement of the pivot axis provides for pivoting the radiator, seen in the direction of ventilation, around an axis extending below the middle of said radiator and ensuring the pivoting movement of the latter, against the force of a return device, by the dynamic pressure which is a function of the speed of walking. This arrangement offers the advantage that no separate adjustment control for the pivoting movement of the radiator is necessary, but that at high operating speeds, the radiator pivots by itself to the position in which the cross section entry is reduced to lower the CW value while, nevertheless, uniform ventilation of the radiator is ensured.In this embodiment also, shutters or sealing strips can be linked to the upper edge or to the edge bottom of the radiator and side closures can be made.

It is however also possible to link to the radiator throttling devices of the air intake section, devices which are produced in the form of pivoting flaps which can rotate with the radiator and in the same direction as the latter, flaps which are mounted around horizontal axes in the air intake plane. Thanks to this arrangement, these pivoting shutters are closing more and more like shutters of the jealousy type as the air flow velocities increase, but in such a way that the air flow passages formed between they are inclined towards the front of the radiator, so that, simultaneously with the throttling effect, a guiding effect is also exerted on the cooling cooling air, air which comes to strike the unit more uniformly of the radiator surface only in the absence of this guiding effect. With this arrangement, the radiator can also be mounted around a pivot axis extending on its lower edge, while the guide surfaces forming the air flow passage are then linked to the upper edge of the radiator.

The invention will be better understood on reading the detailed description which follows and l'examen the examination of the accompanying drawings which represent, by way of non-limiting examples, several embodiments.

On these drawings;
- Figure I shows a schematic median long longitudinal section through the front part of a motor vehicle with a radiator arranged so as to be able to pivot which, in this figure, is in its position corresponding to a low walking speed or garlic slow motion ;
- Figure 2 shows the arrangement of Figure 1 but in the case of a high walking speed
- Figure 3 is a sectional view similar to Figure 9 and showing an embodiment, in which a bellows is associated with the radiator on each of its upper and lower edges
- Figure 4 shows the position of the radiator of Figure 3 for high running speeds ;;
- Figure 5 is a sectional view similar to Figure 1 but with a radiator, mounted so as to be able to pivot around its upper edge, in the idle position
- Figure 6 shows the radiator of Figure 5 in its position corresponding to high running speeds;
- Figure 7 is a sectional view along Figure 5 but in one embodiment in which a pivoting air guide fin is further provided in i respace located in front of the radiator; ;
- Figure 8 shows the arrangement of Figure 7, but for high walking speeds
- Figure 9 is a sectional view according to Figure 1, in another embodiment, in which the radiator pivots backwards as a function of dynamic pressure, the radiator being shown in the idle position
- Figure 10 shows the radiator arrangement of Figure 9 in the position corresponding to high running speeds
- Figure II shows another arrangement of radiator in section similar to Figure 1 but in which, however, the radiator can pivot around a pivot axis provided on its lower edge and is linked with throttle flaps acting at the in the region of the air intake opening, the radiator being shown in the idle position;
- Figure 12 shows the arrangement of Figure II for high walking speeds;
- Figure 13 shows a radiator arrangement similar to Figure 11 but in combination with a louver closing the inlet opening;
FIG. 14 is a schematic front view of a radiator comprising a pivot axis disposed on the lower side and lateral closure elements, and
FIG. 15 is a schematic top view of the radiator of FIG. 14.

 On fiui 1, the front part, formed by the cover 2 and the lower shutter element 3 integral with the engine compartment of a motor vehicle and in particular of a passenger car comprising towards the front a bumper 4 and a cross-member 5 used for fixing the latter, is struck in the direction of the arrows 1 by an air current which passes through the air inlet opening formed by two sections 10a and 10b extending, respectively , above and below the bumper 4 and reaches the radiator 7 disposed behind this opening and which, in the position shown, extends in a substantially vertical plane, then passes through this radiator, so that the air enters the engine compartment 6 and from there is discharged downward or to the side in a manner known per se. The radiator 7 is formed, in a manner also known per se, of a bundle of tubing disposed between an upper water boot 8a and a lower water bottle 8b while at the bases of tubes 8c respective of the water tips. upper and lower 8a, 8b are associated with respective shutter and guide plates 13 and 14 whose function will be described later.

Be radiator is mounted so as to be able to rotate clockwise around a horizontal pivot axis fi arranged (seen in the direction of natural ventilation 1) in the middle of the radiator and it rotates in this direction at relatively running speeds raised by the action of an adjustment motor 11 by means of a hinge 12.

 As already indicated in the preamble, the speed of walking is chosen as a measure of the pivoting, and the adjustment motor 11 receives its corresponding control pulse, of a magnitude as a function of the speed of walking, for example from a tachometer or through a dynamic pressure measuring device.

 As shown in FIG. 2, the radiator 7, at high running speeds, for example at running speeds from 80 km / h, is brought by pivoting at an increasingly greater angle a, to an oblique position with respect to a plane extending perpendicular to the direction of travel, and this in such a way that its zone situated above the pivot axis D is tilted backwards considering the ventilation direction 1. Simultaneously during this pivoting process, the shutter t81e 14 linked to the lower water bottle 8b is pushed more and more in front of the lower air inlet opening 10b until the latter, in the position shown in Figure 2, is fully closed. The upper shutter plate 13 which, like the lower shutter plate 14 has a curvature corresponding to the pivot radius r, simultaneously pivots rearwardly parallel to the shutter element integral with the body 15, which e st is also curved parallel to the arc of a circle described by the pivot radius r, so that in the position shown in FIG. 2, the shutter element 15 secured to the upper shutter plate 13 secured to the radiator a closed passage, which guides the air entering in the direction of the arrows I through the upper inlet opening 10a so that the application of cooling air as uniform as possible over the entire front surface 7a of the radiator 7 now inclined with respect to the direction of travel is ensured. In addition, the closure elements 13 and 15 or 14 can also be associated with lateral closure elements as described below in detail with respect to the embodiment of FIGS. 14 and 15. With this new radiator arrangement , this results in a reduction in the air intake area at relatively high operating speeds and therefore also in a reduction in the value Cw and, at the same time, ventilation of the entire area 7a of the radiator 7 is ensured so that temperature differences between the various points of the extent of the radiator and therefore thermal stresses are largely avoided.

FIGS. 3 and 4 represent an arrangement similar to that of FIGS. 1 and 2 but in which, with the upper and lower water ends 8a and 8b, there are not associated curved closure plates but indeed bellows 18 and 19 or corresponding roll-up mem branes which, during the pivoting movement, lengthen and thus form, in the upper region of the radiator, an air flow passage, which deflects the inflowing air towards the surface of the radiator and ensures, in the lower region, a closure of the lower partial zone of the air inlet opening.

 FIGS. 5 and 6 represent an embodiment in which the inner part 2a of the cover 2 is widely used to delimit an air flow passage intended to guide the air towards the radiator 7. In this case, most of the cooling air enters in the direction of arrows 1 through the lower air inlet opening 10b and is then deflected into the space 30 in front of the radiator 7 extending obliquely towards the surface d entry thereof.In this embodiment, the radiator 7 is mounted in the region of its upper edge, that is to say in the vicinity of the upper water bottle 8a, around the axis of pivoting D, so that its lower edge, that is to say the lower water bottle 8b, serves directly as a throttle valve to reduce the section of the air inlet opening 10b.

In this embodiment, the lower shutter plate 14 integral with the radiator is, as before, adapted to the pivot radius around the axis D but, seen in the direction of travel, it is disposed behind the box. lower water 8b, so that the space remaining between the water bottle 8b and the front edge 16 of the lower closure element 3 secured to the engine compartment is closed during the pivoting of the radiator 7.

 In this case also, ventilation of the entire air inlet surface of the radiator 7 is ensured, whatever the size of the remaining section of the air inlet opening 10b.

 In FIGS. 7 and 8, another improvement of the embodiment of FIGS. 5 and 6 is shown, which resides in the sense that, in this variant, in the space 30 located in front of the radiator 7 is disposed a guide fin. air 31 pivotally mounted about a horizontal axis 32 and which can pivot in the same direction of rotation as the radiator 7 at relatively high operating speeds. This pivoting is ensured by knowing that the guide fin of air 31 is engaged, by means of a linkage 33, with a crank 34 locked in rotation with the radiator 7, crank which, during a pivoting movement thereof Up to position 7 'shown in Figure 8, provides pivoting in the same direction of the air guide fin 31 to position 31', in which it provides a stronger deflection of the cooling air entering through the opening 10b in a direction more perpendicular to the surface of the radiator 7 '. Of course, it would also be possible to provide several air guide fins, or the like, so that, in this embodiment, despite the reduction of the CW value by narrowing the air inlet opening, very uniform ventilation of the obliquely arranged radiator can be ensured.

In the following Figures 9 to 13 are shown embodiments, in each of which the radiator 7 is mounted so as to be able to pivot about a horizontal axis D which, however, extends below the middle of the radiator 7 In the embodiment shown in FIGS. 9 and 10, this axis extends substantially in a horizontal plane located behind the bumper 4 and the corresponding crosspiece 5. The part of the surface of the radiator located above the pivot axis D is therefore considerably larger than the part of the radiator surface which extends below this axis, so that if a return device produced in the form of a tension spring 17 is provided, the magnitude of the force of this spring 'is overcome only at a running speed determined by the force exerted by the dynamic pressure on the part of the surface of the radiator located above the axis of pivoting fi. Ie radiator then automatically rotates to the extreme position shown in Figure 10, while the shutter elements 15 and 13 here again curve the upper limit of the cooling air inlet passage so as to ensure ventilation also uniform as possible of the tilted radiator 7, which is now in position 7 '. The lower air inlet opening 10b is closed by the shutter tab 14. The return spring 17 ensures, when the running speed becomes slower or when the vehicle stops, that the radiator in the region of its upper water box 8a, comes into abutment against the obturation element 15 and takes the position of FIG. 9. In this position, the obturation elements 13 and 15 overlap, while the t81e d shutter 14 extends behind the front edge 16 of the lower shutter member 3 secured to the engine compartment. In this position, the air inlet opening 10a, 10b is therefore completely open.

 In Figures 11 and 12 is shown an embodiment, in which the radiator 7 is mounted so as to be able to pivot about a horizontal axis D arranged in the region of its lower water box 8b. This arrangement of the radiator also firstly takes, under the action of a return spring 17, the initial position shown in FIG. 11, in which the radiator 7 extends substantially in a vertical plane behind the opening d 'air inlet 10a. In this embodiment, shutter means produced in the form of a bellows 18 are associated with the radiator in the region of the upper water box, as in the embodiment of FIGS. 3 and 4. The radiator is further linked, by means of an articulated arm 23, to a lever 35, rigidly linked in rotation to a flap 20 which can pivot around a horizontal axis 21 and initially extending in a horizontal plane, flap which, in turn, is linked to two other identical components, respectively by means of two articulated connecting rods 22. Consequently, if the radiator 7 switches over, in this embodiment, under the action of dynamic pressure, to relatively high walking speeds, so it rotates at the same time, as can be seen in Figure 12, the flaps 20 in the direction of the direction, that is to say in the same direction as its own pivoting movement. The section of the air inlet opening 10a is thus throttled and a decrease in the Cw value at relatively high running speeds. However, another advantage of clear embodiment resides in that the air flow passages 36 formed between the individual flaps 20 ensure a deflection of the cooling air entering in the direction of the arrows 37 in FIG. 12 , so that, simultaneously with the reduction effect of the opening of the air inlet, there is also obtained a deflection effect of the cooling cooling air which, in spite of the constriction, thus licks all the parts of the radiator 7.

 In FIGS. 13 to 15, the arrangement of the radiator itself is carried out in the same manner as in FIGS. 11 and 12. Here again, there is provided a radiator 7 mounted so as to be able to pivot around an axis D at level of its lower water box, radiator which, on its upper water box 8a, is equipped with a return tension spring 17 and a bellows 18 or the like, not shown in these figures. upper 8a is, however, in this embodiment, also linked by means of a target control 25, which passes over a return pulley muffle 26 to a roller or to a rollable membrane 24, the upper end of which 24a is pulled upwards by the tilted radiator 7 via the cable control 25, so that in this way, the section of the inlet opening 10a is at least partially closed. In this case also, it is possible, for example, with an appropriate arrangement of cooling air blowers, to obtain sufficiently uniform ventilation of the tilted radiator 7.

 In this embodiment, lateral limiting partitions of the air inlet are also associated with the radiator and the air inlet opening 17a. The lateral obturation elements 28, rigidly linked to the bodywork, can between linked to the cover 2 or to corresponding parts and present, in their lower region, two bearings 27 for the pivot axis D of the radiator 7. In these bearings 27 can groove, for example, mounted side pins, which are fixed laterally to the lower water boot 8b. The pivot axis D extends, in this case, in the region of the lower water borate 8b. The radiator 7 itself is associated with lateral closure elements 29, which, together with the closure elements 28 integral with the bodywork, ensure that the cross-hatched region 30 in FIG. 13, which corresponds to the pivoting region of the radiator 7 is also closed laterally in an irreproachable manner. This arrangement of an air inlet passage for the radiator 7 is of course not only possible for the embodiment of FIG. 13, but can also be adopted for all the other embodiments while , if necessary, provision may only be made for lateral closure elements rigidly fixed to the bodywork or for & s lateral closure elements arranged above and below the pivot axis of the radiator and linked to that -this.

 In all forms of execution, an order can be additionally provided. depending on the cooling requirements of the motor for the pivoting movement of the radiator 7, a control which prevents the intake of cooling air from being excessively limited in the presence of extremely high outside temperatures and that, for example, sufficient cooling of the engine cooling water can no longer be ensured. The pivoting movement could therefore take place as a function of the temperature of the engine cooling water or as a function of the oil temperature.

In the embodiments comprising an adjustment motor, it suffices to apply to it an appropriate opposing signal opposing the signal as a function of the speed of walking. In the embodiments without adjustment motor, it is necessary to provide suitable adjustment motors.

All the exemplary embodiments shown are suitable for downdraft radiators, in which the water boots 8a and 8b close up and down the beam of the radiator with its water tubes extending vertically; These examples are also valid for transverse current radiators, in which the water boxes close the radiator beam laterally with its water tubes extending horizontally. In this case, the axis of rotation D passes through the two water boxes and can advantageously be produced in the form of inlet and outlet pipes for the cooling medium. The shutter plates 13 and 14 or other shutter or guide devices are then fixed to the side parts of the fan extending up and down.

Claims (19)

 10) Radiator arrangement for motor vehicles, comprising a radiator arranged behind an air inlet opening in the front part of the bodywork, and which is mounted so as to be able to pivot around a horizontal axis and extending transversely in the direction of travel, said arrangement being characterized in that the radiator (7) can pivot, at relatively high travel speeds, by an angle (a) which becomes larger as the speed of travel step increases, to a position inclined with respect to a plane perpendicular to the direction of travel, and in that auxiliary means (14, 19, 20) are connected to said radiator, means which reduce the section of the opening air inlet (10a, lob) as the pivot angle (a) increases.  2) Radiator arrangement according to claim 1, characterized in that other auxiliary means (13, 18, 31) are made in the form of air flow guide surfaces to ensure natural ventilation as uniform as possible of the entire surface (9) of the radiator.  3) Radiator arrangement according to one of claims 1 and 2, characterized in that the radiator (7) is mounted around an axis D passing through its middle if it is considered in the ventilation direction, and in that the auxiliary means are produced in the form of sealing and guiding surfaces (13, 14) fixed to the upper and lower edges (water boxes 8a, 8b).  4) Radiator arrangement according to claim 3, characterized in that the al liary means (13, 14) are made in one piece with the tubular bottoms of the water boxes or with an upper or lower side part.  5) Di radiator position according to one of claims 3 and 4, characterized in that the shutter and guide t8les (13, 14) are curved shutter surfaces and adapted to the pivot radius (r), surfaces to which are associated guide surfaces (15) integral with the body and also adapted to the pivot radius. (r).  6) Radiator arrangement according to one of claims 3 to 5 characterized in that the radiator (7) is arranged such that, during a pivoting movement, the guide surface (14), arranged on the box water tank (8b), can be pivoted as a shutter in the air inlet section (lob), while the guide surface (13) arranged on the upper water box (8a) serves , together with the guide surface (15) integral with the body, of deflection sheet for the air flow.  7) Radiator arrangement according to one of claims 1 and 2, characterized in that the shutter and guide surfaces are made in the form of bellows (18, 19) of variable length or of rollable membranes.  8) Radiator arrangement according to one of claims 1 and 2, characterized in that the radiator (7) is mounted so as to be able to pivot in the region of its upper water bottle (8a), while its lower edge serves directly from part of a shutter reducing the air inlet section (10b).  9) Radiator arrangement according to claim 8, characterized in that the pivot axis (D) of the radiator (7) is provided at a distance from the air inlet opening (10b) but immediately in the vicinity of the lower water box (8b) of the radiator (7) and in that at least in the region between the pivot axis (D) and the upper side of the air inlet opening are provided surfaces guide (cover 2) intended to exert an influence on the ventilation of the radiator (7) in an oblique position.  10) Radiator arrangement according to one of claims 8 and 9, characterized in that as an auxiliary means a closure strip (14) extending rearward and adapted to the pivot radius (r) is attached to the lower water boot (8b) tv  11) Radiator arrangement according to claim 9 characterized in that the inner side of the cover (2) is arranged in the form of an upper guide surface for the air flow which strikes the radiator.  12) Radiator arrangement according to one of claims 9 to II, characterized in that, in the region located in front of the radiator (7) in an inclined position, there are provided air flow guide fins (31) which can pivot about horizontal axes (32) and can be actuated by the radiator (7).  13) Radiator arrangement according to one of claims 1 and 2, characterized in that the radiator (7), seen in its ventilation direction, can pivot around an axis (D) located below its middle and in that its pivoting movement is ensured, against the force of a return device (17), by the dynamic pressure as a function of the speed of walking.  14) Radiator arrangement according to claim 13, c actetized in that a closure strip (14), extending in front of the radiator (7) considering the ventilation direction, is fixed to the lower water tank ( 8b).  15) Radiator arrangement according to claim 13, characterized in that devices (20) throttling the air inlet section are connected to the radiator (7).  16) Radiator arrangement according to claim 15, characterized in that the radiator (7) are linked pivoting flaps <20) which can rotate in the same direction as it and which are mounted around horizontal axes (21) and are arranged in the air inlet opening (îOa). 17) Radiator arrangement according to claim 13, characterized in that the radiator (7) is mounted on a pivot axis (D) extending in the vicinity of its lower water box (su).  18) Radiator arrangement according to one of claims 1 to 17, characterized in that the radiator (7) are associated with lateral closure elements (28, 29) extending at least over the entire extent of the pivot region (30). 19) Radiator arrangement according to one of claims I to 18, characterized in that the pivoting movement of the radiator (7) can also be influenced by a signal which corresponds to the cooling requirements of the engine and, for example, to the temperature of the cooling water.