Adjustable grille

Abstract

The invention relates to an adjustable grille for a motor vehicle comprising: an upper crosspiece opposite a lower crosspiece delimiting a transverse air passage opening; a plurality of flaps (38, 41) adapted to be mounted across said transverse opening, each of the flaps (38, 41) having an upper pivot and an opposite lower pivot engaging respectively in the upper and lower crosspieces; drive members for being able to simultaneously drive said flaps in pivoting. Said drive members comprise a plurality of connecting rods (42, 44) successively connecting the flaps (38, 41) two by two, and at least one motor member (54; 56) for being able to pivotally drive one (31, 35) of said flaps of said plurality of flaps, whereby said flaps of said plurality of flaps are simultaneously driven in pivoting. Figure to be published with the abstract: Fig. 3

Description

Title of the invention: Adjustable grille

[0001] The present invention relates to an adjustable motor vehicle grille allowing the air intake to be modulated.

[0002] Motor vehicles with thermal or electric engines require an air intake at the front to be able to cool the elements of the powertrain when it is in operation.

[0003] Thus, the grille, installed in the front face of vehicles, usually has an air intake opening which extends transversely, which opening is equipped with a grille. Also, the dimensions of the opening are predefined and they offer a compromise between good ventilation of the powertrain and a good coefficient of penetration into the air of the vehicle.

[0004] However, when the motor vehicle is moving at high speed, the entry of air through the grille causes resistance to movement and it is then advantageous to close the opening. But when the powertrain is relatively hot, for example in the mountains, it is conversely necessary for the opening to be free.

[0005] Also, it has been imagined to implement movable flaps pivoting across the opening and thus, to automatically adjust the flaps in a position of closing the opening when the vehicle is moving at high speed, or in a position in which they allow the passage of air through the opening when cooling of the powertrain is necessary.

[0006] Reference may be made in particular to document WO2013092141, which discloses such adjustable shutters.

[0007] Also, the shutters can be driven in movement by means of a movable frame to which each of the shutters is connected. The frame is then driven in translational movement by means of an electric motor. It then drives the shutters between a position in which they extend along a plane parallel to the mean plane defined by the opening, when they obstruct it, and a position in which they extend substantially perpendicularly to it to release it.

[0008] This method of driving the shutters uses a plurality of more or less long parts cooperating with each other. Consequently, their cooperation can cause jamming or the buttressing of certain parts.

[0009] Also, a problem which arises and which the present invention aims to resolve is to propose a more reliable adjustable grille which is also of advantageous cost.

[0010] In order to solve this problem, an adjustable motor vehicle grille is proposed comprising: an upper cross member opposite a lower cross member delimiting a transverse air passage opening; a plurality of flaps adapted to be mounted across said transverse opening so that the flaps of said plurality of flaps are regularly spaced from one another, each of the flaps having an upper pivot and an opposite lower pivot engaging respectively in the upper and lower crosspieces; drive members for being able to simultaneously drive said flaps in pivoting between a first position in which they are oriented transversely edge to edge in said transverse opening to close said air passage path, and a second position in which they are oriented longitudinally to free said air passage path.

[0011] Also, said drive members comprise a plurality of connecting rods successively connecting two by two the flaps of said plurality of flaps, and at least one motor member to be able to pivotally drive one of said flaps of said plurality of flaps, whereby said flaps of said plurality of flaps are simultaneously pivotally driven.

[0012] Thus, a characteristic of the invention lies in the implementation of connecting rods connecting all the flaps 2 by 2. In other words, each flap of the plurality of flaps is connected to the one preceding it by a connecting rod and to the following flap by another connecting rod. As will be explained in more detail in the remainder of the description, the connecting rods have two opposite ends mounted respectively in rotation on the flaps. In this way, all the flaps are connected to each other. And the pivoting drive of only one of the flaps makes it possible to drive all the flaps simultaneously. Advantageously, one flap of the end of the plurality of flaps is pivoted. In this way, relatively short parts are used to limit the possibilities of jamming and buttressing.

[0013] Such an implementation is relatively simple. And few parts are then necessary. It will also be observed that the connecting rods are articulated on the flaps, and consequently, that the curvature of the grille can be significant, without disturbing the movement of the flaps. Such a possibility is not offered at all by the flap drive devices according to the prior art by means of a movable frame.

[0014] Preferably, and according to the invention, said plurality of flaps extends from a first flap to a last flap, and said at least one driving member is adapted to pivot said first flap. In this way, the driving member can be installed at one end of the plurality of flaps and not hinder the transverse opening of the grille.

[0015] Also, according to a particularly advantageous characteristic of the invention, said transverse opening has a left portion symmetrical to a right portion with respect to a median zone, while said plurality of flaps comprises two half-plurality of flaps respectively mounted across the left and right portions. In this way, it is possible to dissociate the movement of the two half-plurality of shutters, arranged symmetrically with respect to the middle zone, and to be able to drive them in rotational movement in two opposite directions as will be explained below.

[0016] Furthermore, said plurality of connecting rods then advantageously has two half-plurality of connecting rods respectively connecting the flaps of said two half-plurality of flaps. In this way, the flaps of the two half-plurality of flaps can be driven independently in the two opposite directions.

[0017] Also, according to the invention, said flaps each have an inner wall opposite an outer wall and an upper edge opposite a lower edge, and preferably, they each comprise an upper plate and a lower plate extending projecting from said inner wall and running along said upper and lower edges respectively, said upper plate comprising said upper pivot and said lower plate comprising said lower pivot. Thus, the pivots are located behind the inner face of the flaps. Therefore, when the flaps pivot, they tend to be driven towards the inside of the vehicle. In this way, the edges of the flaps are not very protruding at the front of the vehicle. This presents an advantage in the event of a pedestrian impact.

[0018] Furthermore, said upper plate of each of said flaps has an orifice located at a distance from said upper pivot for connecting said connecting rods and said flaps. The orifice thus makes it possible to connect the connecting rods to the flaps and thus connect all the flaps together so that they can be driven in a chain, simultaneously.

[0019] According to the invention, each of said connecting rods advantageously comprises a first end comprising two coaxial opposite journals and a second end having a bore substantially parallel to said journals. In this way, one of the journals of the connecting rods engages in the orifice of the upper plate, while the opposite journal receives the second end of the neighboring connecting rod. Thus, the connecting rods are not only successively connected to each other, but in addition each of their first ends is connected to a flap, as will be explained in more detail below. In other words, the connecting rods connected to each other form a chain of the “roller chain” type, and each of the links of the chain is connected to a flap.

[0020] Also, one of said two journals has, according to the invention, a diameter substantially equal to the diameter of said bore. In this way, said one of said two journals of a connecting rod engages in the bore of an adjacent connecting rod, and consequently the first end of said one connecting rod is guided in rotation relative to the second end of said adjacent connecting rod.

[0021] Furthermore, each of said connecting rods has, according to the invention, two branches inclined and offset relative to each other. Thanks to the offset, in a direction perpendicular to the two branches, the connecting rods are engaged with each other. in the others and they extend along a mean plane perpendicular to their trunnions.

[0022] And, according to the invention, each of said connecting rods advantageously has a general arc shape. In this way, their cooperation with the flaps is facilitated.

[0023] Other features and advantages of the invention will emerge from reading the description given below of a particular embodiment of the invention, given for informational purposes but not as a limitation, with reference to the appended drawings in which:

[0024] [Fig.l] is a schematic front view of a motor vehicle equipped with an adjustable grille according to the invention;

[0025] [Fig.2] is a schematic three-quarter perspective view from the front left of the object of the invention;

[0026] [Fig.3] is a partial exploded schematic rear and top view of the object of [Fig.2];

[0027] [Fig.4A] and [Fig.4B] are schematic perspective detail views of two elements of the objects of [Fig.3] symmetrical to each other;

[0028] [Fig.5A] and [Fig.5B] are schematic perspective detail views of two other elements of the objects of [Fig.3] symmetrical to each other;

[0029] [Fig.6] is a schematic perspective view of two elements of the type illustrated in [Fig.5B] cooperating with each other;

[0030] [Fig.7A] is a partial rear schematic view of the object of [Fig.2], in a first state; and,

[0031] [Fig.7B] is a partial rear schematic view of the object of [Fig.2], a second state.

[0032] [Fig.l] shows a motor vehicle 10, seen from the front, and it is inscribed in an orthogonal reference frame X, Y, Z, in which the X axis extends in a front-rear longitudinal direction of the motor vehicle, oriented towards the rear; the Y axis extends in a transverse direction of the vehicle, oriented from left to right when in a rolling situation; and the Z axis extends in a vertical direction, oriented away from the ground.

[0033] The motor vehicle 10 is equipped, on its front face, with a grille 12 having an upper part 14 and a lower part 16. Also, the vehicle 10 has a front compartment 18 in which is housed a power unit not shown and located behind the grille 12.

[0034] Also, the lower part 16 of the grille 12, which is the subject of the invention, will be described with reference to [Fig. 2]. It will be observed that the upper part 14 could also be the subject of the invention.

[0035] The lower part 16 of the grille is curved. It extends longitudinally from a left end 20 to a right end 22. It has a left part 24 sy metric of a straight part 26 with respect to a median plane Pm.

[0036] Also, the median plane Pm intersects the lower part 16 in a median zone 28.

[0037] The lower part 16 of the grille has an upper crosspiece 30 opposite a lower crosspiece 32. The crosspieces 30, 32 define between the two, a transverse opening 34. The upper crosspiece 30 and the lower crosspiece 32 extend substantially parallel to each other and they are connected together at their ends 20, 22 to form a single piece.

[0038] The opening 34 is here closed by two half-plurality of shutters, a half-plurality 36 of right shutters 38 and a half-plurality 37 of left shutters 41 opposite with respect to the median zone 28.

[0039] [Fig. 3] to which reference will now be made illustrates, in exploded view, the half-plurality 36 of right flaps 38 and opposite, with respect to the median plane Pm, the half-plurality 37 of left flaps 4L. The half-plurality 36 of right flaps 38 extends between a first right flap 31 distant from the median plane Pm, and a last right flap 33 close to the median plane Pm, while the half-plurality 37 of left flaps 41 extends between a first left flap 35 distant from the median plane Pm, and a last left flap 39 close to the median plane Pm.

[0040] Furthermore, [Fig. 3] also shows drive members for the flaps and in particular, right connecting rods 42 symmetrical with left connecting rods 44, right arms 46 and right forearms 48, symmetrical with left arms 50 and left forearms 52, and a right motor member 54 opposite a left motor member 56.

[0041] It will also be observed that the right connecting rods 42 extend from a first right connecting rod 51, intended to cooperate with the first right flap 31 and a second contiguous right flap 29, and a last right connecting rod 53 intended to cooperate with the last right flap 33 and the penultimate contiguous right flap 27. In the same way, the left connecting rods 44 extend from a first left connecting rod 55 intended to cooperate with the first left flap 35 and a second contiguous left flap 59, and a last left connecting rod 57 intended to cooperate with the last left flap 39 and the penultimate contiguous left flap 61.

[0042] We will first detail one of the right flaps 38 with reference to [Fig.4A].

[0043] Firstly, it will be observed that the flap 38 has two flap parts, a first flap part 62 and a second flap part 64, symmetrical to each other with respect to a flap median plane Pmv.

[0044] The right flap 38 has two opposite lateral edges, a first edge 66 having a median protrusion in the form of tabs, and opposite, a second edge 70 having a median notch 72 whose shape corresponds to that of said median protrusion. It also has a first rectilinear edge 74 in the first flap part 62 and a second rectilinear edge 76 and parallel to the first 74, in the second part of section 64.

[0045] Also, the right flap has a front face 78 opposite a rear face 80. In addition, it comprises a rear partition 82, or wing, extending parallel to and opposite the rear face 80.

[0046] The rear partition 82 is secured to the rear face 80 of the flap by means of four spacers, two first spacers 84, 86, in the first part of the flap 62 and two second spacers 88, 90, in the second part of the flap 64. The rear partition 82 thus extends at a distance of approximately 25 mm, for example, from the rear face 80.

[0047] One 84 of the two first spacers extends from the rear face 80 in the vicinity of the first edge 74, and one 88 of the two second spacers extends from the rear face 80 in the vicinity of the second rectilinear edge 76. The other two spacers 86, 90 extend parallel opposite one another and in line respectively with those 84, 88 located respectively in the vicinity of the first and second edges 74, 76.

[0048] Furthermore, a first oblong plate 92 is connected, along the first rectilinear edge 74, to the first spacer 84 located in the vicinity of the first edge 74. The first oblong plate 92 extends substantially perpendicular to the rear face 80 and it defines a mean plane coming to tangent the first rectilinear edge 74 and the rear partition 82.

[0049] Conversely, a second oblong plate 94, symmetrical to the first with respect to the median plane of the Pmv flap, is connected along the second rectilinear edge 76, to the second spacer 88 located in the vicinity of the second rectilinear edge 76. Also, it extends substantially perpendicular to the rear face 80 and it also defines a median plane coming to tangent the second rectilinear edge 76 and the rear partition 82.

[0050] Also, the oblong plates 92, 94, at one of their ends, respectively support a first pivot 96 and a second pivot 98 extending respectively in two opposite directions from each other. The second pivot 98 is here masked by the second plate 94.

[0051] The first 96 and second 98 pivots extend in the vicinity of the second edge 70 relative to the first opposite edge 66, and in a position spaced from the rear face 80. Also, the two pivots 96, 98 define a pivot axis substantially parallel to the rear face 80 of the shutter and also to the mean lines defined by the first 66 and second 70 edges.

[0052] At the other end, the oblong plates 92, 94 respectively have a first orifice 100 and a second orifice 102. The first 100 and second 102 orifices are in a position spaced from the rear face 80 and substantially equidistant from the two lateral edges 66, 70.

[0053] It will be observed that the first lateral edge 66 has a groove 104, which defines a rebate 106, from the first edge 74 to the second edge 76.

[0054] Also, the left flaps 41, one of the examples of which is illustrated in [Fig.4B] are identical to the right flaps 38 of [Fig.4A]. And, we move from that of [Fig.4A] to that of [Fig.4B] by tilting it around a straight line included in the mean plane of flap Pmv and by rotating it around a straight line perpendicular to the mean plane of flap Pmv.

[0055] The elements of the object of [Fig.4A] identical to those of that of [Fig.4B] have the same reference affected by a prime sign: " '

[0056] Thus, we find in [Fig.4B], the first part 62' of the flap and the second part 64', symmetrical to each other with respect to the median plane of the flap Pmv'.

[0057] We find the two opposite lateral edges, the first edge 66' and opposite, the second edge 70'. It also has the first rectilinear edge 74' parallel to the second 76'.

[0058] Also, the left flap has its front face 78' opposite its rear face 80'. It includes the rear partition 82', or wing, extending parallel and opposite the rear face 80'.

[0059] The first two spacers 84', 86' are found in the first part of the flap 62' and two second spacers 88', 90' are found in the second part of the flap 64'.

[0060] Conversely, the second oblong plate 94' is connected to the second spacer 88' located in the vicinity of the second rectilinear edge 76'.

[0061] Also, we find the first pivot 96' and the second pivot 98' extending respectively in two opposite directions from each other of the two oblong plates 92', 94', at one of their ends.

[0062] Also, the oblong plates 92', 94' respectively have, at the other end, the first orifice 100' and the second orifice 102'.

[0063] And we also find the groove 104' of the first lateral edge 66' as well as the rebate 106', from the first edge 74' to the second edge 76'.

[0064] Thus, the flaps of the half-plurality 36 of right flaps 38 are aligned closely in the right part 26 of the grille, as shown in [Fig.2], so that the first part 62 of the flaps is mounted integral with the upper crosspiece 30, while the second part 64 is mounted integral with the lower crosspiece 32. The first pivots 96 of the right flaps 38 are then mounted to rotate in orifices made in the upper crosspiece 30, while the second pivots 98 are mounted to rotate in orifices made in the lower crosspiece 32.

[0065] As regards the half-plurality 37 of left flaps 41, they are aligned closely in the left part 24 of the grille so that the first part 62' is mounted integral with the lower crosspiece 32, while the second part 64' is mounted integral with the upper crosspiece 30. And the first pivots 96' of the left flaps 41 are mounted to rotate in orifices made in the crosspiece in lower 32, while the second pivots 98' are rotatably mounted in holes made in the upper crosspiece 30.

[0066] We will now detail the connecting rods, right 42 and left 44, as shown in [Fig.3], respectively with regard to [Fig.5A] and [Fig.5B].

[0067] The connecting rods 42, 44 have a general arc shape.

[0068] Thus, the straight connecting rod 42 has two branches of substantially the same thickness, a curved straight branch 108 and a straight straight branch 110, shorter than the curved branch 108. The straight branch 110 extends substantially perpendicular to the curved branch 108. And furthermore, it extends offset relative to this curved branch 108 in a direction perpendicular to the two branches 108, 110. Thus, the straight straight branch 110 has an upper face 109 defining a mean plane, while the curved straight branch 108 has a lower face 111 extending substantially in the mean plane of the upper face 109.

[0069] Also, the straight straight branch 110 has a first free end 112 provided with two coaxial opposite trunnions, an upper trunnion 114 and a lower trunnion 116. The upper trunnion 114 extends projecting from the upper face 109 over a length close to the thickness of the curved branch 108. And the lower trunnion 116 extends projecting from the lower face, opposite the upper face 109, over a length close to that of the upper trunnion 114. Also, the two trunnions 114, 116 have substantially the same diameter.

[0070] As for the curved straight branch 108, it has a second free end 118 provided with a bore 120. The bore 120 extends in a direction substantially parallel to the upper journal 114. In addition, the bore 120 has a diameter substantially greater than or equal to that of the upper journal 114.

[0071] Unlike the flaps, the right connecting rod 42 does not have symmetry, and consequently its mirror image cannot be superimposed on it. In other words, the left connecting rods 44 are different from the right connecting rods, even if they have the same elements.

[0072] Thus, the elements of the left connecting rod 44 illustrated in [Fig.5B] have the same references as the elements of the right connecting rod 42 illustrated in [Fig.5A] with a prime sign: “'”.

[0073] The left connecting rod 44 then has two branches, a curved left branch 108' and a straight left branch 110'. The latter extends substantially perpendicular to the curved branch 108', and in a stepped manner. Thus, the straight left branch 110' has an upper face 109' defining a mean plane, while the curved left branch 108' has a lower face 111' extending in the mean plane of the upper face 109'.

[0074] Also, the straight left branch 110' has a first free end 112' provided with an upper journal 114' and a coaxial lower journal 116'. The upper journal 114' extends projecting from the upper face 109' over a length close to the thickness of the curved branch 108'. And the lower journal 116' extends projecting from the lower face, opposite the upper face 109', over a length close to that of the upper journal 114'. Also, the two journals 114', 116' have substantially the same diameter.

[0075] And the curved straight branch 108' has a second free end 118' provided with a bore 120'. The bore 120' extends in a direction substantially parallel to the upper journal 114'. In addition, the bore 120' has a diameter substantially greater than or equal to that of the upper journal 114'.

[0076] Thus, after the half-plurality 37 of left flaps 41 has been installed in the left portion 24 of the grille, the first left link 55, illustrated in [Fig.3] and of the type of the left link 44 illustrated in [Fig.5B], is mounted on the first left flap 35 and on the second contiguous left flap 59.

[0077] More precisely, the second free end 118' of the curved right branch 108' is connected to the second oblong plate 94' of the first left flap 35 by means of the drilling 120' and the orifice 102', while the lower journal 116' is engaged through the orifice 102' of the second plate 94' of the second left flap 59. Thus, the rectilinear left branch 110' of the first left connecting rod 55 comes to rest flat against the second oblong plate 94'.

[0078] Also, the two second plates 94' of the two left flaps 35, 59 extending in the same plane, a spacer ring not shown is interposed between the second free end 118' of the curved right branch of the first left connecting rod 55 and the second oblong plate 94' of the first left flap 35. The spacer ring is adjusted coaxially to the orifice 102' and to the bore 120', and a connecting rod not shown, is engaged through the assembly. The first left connecting rod 55 is thus pivotally mounted on the first left flap 35, on the one hand, and on the second left flap 59, on the other hand.

[0079] Then, as illustrated in [Fig.3], a second left link 63 is adapted to connect together the second left flap 59 via the first left link 55, and a third left flap 65 contiguous to the second left flap 59.

[0080] Thus, the second free end 118' of the curved right branch 108' of the second left connecting rod 63 is connected to the first left connecting rod 55. To do this, the upper journal 114' of the first connecting rod 55 is engaged through the bore 120' of the second left connecting rod 63 as illustrated in [Fig.6] showing the two left connecting rods 55, 63 only.

[0081] Also, the second free end 118' of the second connecting rod 63 comes to bear on the upper face 109' of the rectilinear left branch 110' of the first connecting rod 55.

[0082] As indicated above, the lower journal 116' of the first connecting rod 55 is naturally engaged through the orifice 102' of the second plate 94' of the second left flap 59. And the lower journal 116' of the second connecting rod 63 then engages through the orifice 102' of the second plate 94' of the third left flap 65, while the rectilinear left branch 110' of the second left connecting rod 63 comes to rest flat against the second oblong plate 94' of the third flap 65.

[0083] Thus, the three left flaps 35, 59 and 65 as illustrated in [Fig.3], are intended to be connected together by means of the two left connecting rods 55, 63.

[0084] And so it is with the other left flaps up to the last 39, which are connected together by means of the other left connecting rods 44 connected to each other.

[0085] Furthermore, in a completely symmetrical and identical manner, the right flaps 38 of the half-plurality 36 of right flaps 38 are connected together, from the first 31 to the last 33, by means of the right connecting rods 42, from the first 51 to the last 53.

[0086] The right connecting rods 42 and the left connecting rods 44 thus respectively form two chains, the links of which are respectively connected to each of the right 38 and left 41 flaps.

[0087] We will now refer to [Fig.7A], showing partially in rear view, the right part 26 of the grille. We thus find there the half-plurality 36 of right flaps 38 in the position of closing the transverse opening 34, in the right part 26, from the first right flap 31 to the last right flap 33.

[0088] [Fig.7A] also shows the right motor member 54 on which the right arm 46 is installed, and the right forearm 48 which connects the right arm 46 and the first right flap 31. The latter is for example equipped with an ear, spaced from the two pivots 96, 98, allowing the end of the right forearm 48 to be mounted in rotation on the first right flap 31.

[0089] In this way, when the right motor member 54 controls the rotation of the right arm 46 in a clockwise direction, seen from above, the right forearm 48 then pivots, also in a clockwise direction, the first right flap 31. This then simultaneously causes the pivoting of the second contiguous right flap 29, by means of the first right connecting rod 51.

[0090] And thus, step by step, the right flaps 38 are driven simultaneously in pivoting, as illustrated in [Fig.7B]. They then form a grid across the transverse opening 34 thus allowing the passage of air when the vehicle is in motion.

[0091] Conversely, when the right motor member 54 controls the rotation of the right arm 46 in an opposite direction, the right forearm 48 pivots the first right flap 31 in an opposite direction and therefore all the right flaps 38. They then return to their initial position in which they close the transverse opening 34.

[0092] Symmetrically, and entirely analogously, the first left flap 35 is adapted to be controlled in pivoting by means of the left motor member 56, the left arm 50 and the left forearm 52 so as to drive in pivoting simultaneously all the left flaps 41 of the plurality 37 of left flaps.

[0093] The left motor member 56 and the right motor member 54 are preferably controlled simultaneously so as to be able to cause the right flaps 38 and the left flaps 41 to pivot simultaneously in opposite directions.

[0094] It will be observed that such a solution makes it possible to implement a limited number of small-sized parts.

[0095] In addition, thanks to the connecting rods articulated in relation to each other and in addition in relation to the shutters, they can be implemented through relatively curved grilles.

Claims

Claims

1. Adjustable motor vehicle grille comprising: - an upper cross member (30) opposite a lower cross member (32) delimiting a transverse air passage opening (34); - a plurality of flaps (38, 41) adapted to be mounted across said transverse opening (34) so that the flaps of said plurality of flaps are regularly spaced from one another, each of the flaps (38, 41) having an upper pivot (96; 98') and an opposite lower pivot (98; 96') respectively engaging in the upper (30) and lower (32) cross members; - drive members for being able to simultaneously drive said flaps in pivoting between a first position in which they are oriented transversely edge to edge in said transverse opening to close said air passage path, and a second position in which they are oriented longitudinally to free said air passage path;characterized in that said drive members comprise a plurality of connecting rods (42, 44) successively connecting two by two the flaps of said plurality of flaps (38, 41), and at least one motor member (54; 56) to be able to pivotally drive one (31, 35) of said flaps of said plurality of flaps, whereby said flaps of said plurality of flaps are simultaneously pivotally driven.;

2. Adjustable grille according to claim 1, characterized in that said plurality of flaps (38, 41) extends from a first flap (31; 35) to a last flap (33; 39), and in that said at least one motor member (54; 56) is adapted to pivot said first flap (31; 35).

3. Adjustable grille according to claim 1 or 2, characterized in that said transverse opening (34) has a left portion symmetrical to a right portion with respect to a median zone (28), while said plurality of flaps comprises two half-plurality (36; 37) of flaps respectively mounted across the left and right portions.

4. Adjustable grille according to claim 3, characterized in that said plurality of connecting rods has two half-plurality (42; 44) of connecting rods respectively connecting the flaps of said two half-plurality (36; 37) of shutters.

5. Adjustable grille according to any one of claims 1 to 4, characterized in that said flaps each have an inner wall (80) opposite an outer wall (78) and an upper edge (74; 76') opposite a lower edge (76; 74'), and in that they each comprise an upper plate (92; 94') and a lower plate (94; 92') extending projecting from said inner wall (80) and running respectively along said upper and lower edges, said upper plate (92; 94') comprising said upper pivot (96; 98') and said lower plate (94; 92') comprising said lower pivot (98; 96').

6. Adjustable grille according to claim 5, characterized in that said upper plate (92; 94') of each of said flaps has an orifice (100; 102') located at a distance from said upper pivot (96; 98') for connecting said connecting rods and said flaps.

7. Adjustable grille according to any one of claims 1 to 6, characterized in that each of said connecting rods (42, 44) comprises a first end (112) comprising two opposite coaxial journals (114, 116) and a second end (118) having a bore (120) substantially parallel to said journals.

8. Adjustable grille according to claim 7, characterized in that one (114) of said two pins has a diameter substantially equal to the diameter of said bore (120).

9. Adjustable grille according to any one of claims 1 to 8, characterized in that each of said connecting rods (42, 44) has two branches (108, 110) inclined and offset from each other.

10. Adjustable grille according to any one of claims 1 to 9, characterized in that each of said connecting rods (42, 44) has a general arc shape.

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