Motor vehicle engine compartment provided with an expansion tank for a cooling system

Description

[0001] The present invention relates to a motor vehicle engine compartment provided with an expansion tank for a cooling system.

[0002] As known, a motor vehicle engine is cooled by a cooling system using a mixture of water/ethylene glycol as a heat transfer fluid, and envisages an expansion tank fixed to a support structure arranged in the motor vehicle engine compartment. Normally, the expansion tank is fixed to said support structure by screws, bolts, metal coupling elements, etc.... In order to reduce the time required to fix the expansion tank and reduce the cost for manufacturing the connecting elements, it is felt the need for coupling the expansion tank to the support structure without the use of additional metal elements, but still ensuring stable fixing during time and ease of mounting/dismounting.

[0003] EP2375028 corresponds to the preamble of claim 1 and describes a bayonet-coupling between a support and the expansion tank, allowing for simple and quick expansion tank mounting without special tools. This solution provides a more rigid point to be by-passed during coupling so as to indicate to the installer when the expansion tank has reached a locked position.

[0004] Purpose of the present invention is to provide a motor vehicle engine compartment provided with an expansion tank for a cooling system, which allows to fulfill the necessity described above in a simple and economic way.

[0005] According to the present invention, a motor vehicle engine compartment provided with an expansion tank for a cooling system, as defined in claim 1 is provided.

[0006] For a better understanding of the present invention a preferred embodiment is now described, purely by way of nonlimiting example, with reference to the accompanying drawings, wherein:

• Figure 1 is a perspective view, showing a preferred embodiment of the motor vehicle engine compartment provided with an expansion tank for a cooling system, according to the present invention;
• Figure 2 is similar to Figure 1 and shows the expansion tank when the latter is decoupled from a respective support structure;
• Figure 3 shows, from a different point of view, the support structure shown in Figures 1 and 2; and
• Figure 4 is a bottom perspective view of a detail of the expansion tank of figures 1 and 2.

[0007] In Figures 1 and 2, the reference number 1 denotes an expansion tank, constituting part of a cooling system which is arranged in a motor compartment 3 (partially illustrated) of a motor vehicle and which, in use, circulates a cooling fluid for removing heat from an internal combustion engine (not shown).

[0008] The engine compartment 3 has a structure 5, which supports the expansion tank 1 and, preferably, a heat exchanger, not shown, which also forms part of the cooling system. Preferably, the expansion tank 1 is fixed to a cross member 7, defining the upper end of the structure 5 and extending along a substantially horizontal direction, orthogonal to the motor vehicle travel direction. In particular, the expansion tank 1 is fixed to a side portion, on the left according to the vehicle travel direction, at one end 9 of the cross member 7.

[0009] With reference to Figure 3, the portion 9 comprises an appendix 10, which horizontally protrudes with respect to the remaining part of the portion 9 and has a vertical through hole 11. The cross section of the hole 11 is not circular, but is elongated along a horizontal axis 13, so as to define a slot. In the particular example illustrated, the axis 13 is parallel to the cross member 7.

[0010] In particular, the cross section of the hole 11 is constant in the vertical direction, and the ends of the hole 11, along the axis 13, are defined by respective semi-cylindrical surfaces 15. Laterally, the hole 11 is delimited by two guide surfaces 16, which are vertical and parallel to the axis 13, face each other and are connected to one another by the surfaces 15.

[0011] Furthermore, the portion 9 comprises a supporting wall 20 being substantially horizontal, is arranged at a different height with respect to the hole 11, preferably at a greater height, and is also horizontally spaced apart from the hole 11.

[0012] On the top the wall 20 is delimited by a face 21, extending along a direction 22 parallel to the axis 13 and defining a resting surface for two brackets 23 forming part of the expansion tank 1.

[0013] The wall 20 has at least one opening 24, which will be described in detail hereinafter, and is configured so as to bayonet-couple the brackets 23 to the cross member 7 along the direction 22.

[0014] With reference to Figures 2 and 3, the expansion tank 1 is made of plastic material, made from a single piece or from multiple pieces fixed to one another, and comprises a container 29, of a known type, adapted to receive the cooling liquid. In particular, the container 29 has, at the upper end thereof, an opening 30 closed by a removable cap, not shown, and defines an internal cavity communicating with the remaining part of the cooling system by a fitting 31 which laterally protrudes from the container 29.

[0015] For the coupling to the cross member 7, the expansion tank 1 comprises a positioning pin 33, which vertically protrudes downwards along an axis 34 starting from a support portion 35 defined, in particular, by the lower end of the container 29.

[0016] The pin 33 comprises a portion 36 which, along a horizontal direction 37 perpendicular to axis 13, has a width substantially equal to the distance between the guide surfaces 16, so as to be guided by the hole 11 along the axis 13 during the mounting of the expansion tank 1.

[0017] Preferably, as mentioned above, the direction 22 and the axis 13 are rectilinear. Alternatively, the direction 22 may be curved.

[0018] Advantageously, the pin 33 comprises a terminal portion 38, which has a radial dimension greater than the hole 11 and is elastically deformable, radially inwards, so as to be axially inserted into the hole 11. When the portion 36 completely engages the hole 11, the portion 38 elastically returns to its original shape, snapping radially outwards over a lower edge 39 of the hole 11, so as to prevent the upward slippage of the pin 33 during installation and operation of the expansion tank 1.
In particular, the portion 36 comprises a fork defining the axial extension of the portion 36 and which consists of two arms 41 spaced apart from one another along the direction 37, so as to be able to radially flex inwards. The portion 36 further comprises, two retaining teeth 43, protruding from the respective arms 41 towards the outside along the direction 37, so as to engage the edge 39 when the pin 33 has been inserted into the hole 11.

[0019] The coupling between the pin 33 and the hole 11 is not of a stable type, but has the main function of facilitating mounting and achieving a more stable coupling of the brackets 23.

[0020] With reference to Figure 2, the brackets 23 are fixed with respect to the container 29, and arranged higher than the pin 33, being horizontally spaced apart from each other and advantageously laterally protrude from the container 29, thus are radially spaced from the axis 34. According to an alternative not shown, only one bracket 23 is provided.

[0021] As shown in Figure 4, each bracket 23 comprises a wall 44 parallel to the face 21 and at least one connecting appendix 46, which comprises, in turn, a vertical arm 47, which downwardly protrudes from the wall 44, and a cross fin 48, horizontally protruding from a lower end of the arm 47 and is vertically distanced from wall 44 by a length substantially equal to the thickness of the wall 20, so as to have, between the wall 44 and the fin 48, an empty space adapted to be engaged by an edge of the wall 20 for vertically locking the bracket 23.

[0022] Advantageously, each bracket 23 has a plurality of connecting appendixes 46, each of which engages a corresponding opening 24.

[0023] Again referring to Figure 2, each opening 24 comprises an area 55 having such a size and a shape that the corresponding connecting appendix 46 can be vertically fitted with clearance; and an area 56, which is narrower than the area 55 so as to let the arm 47 slide along the direction 22, but axially retaining the fin 48. In particular, the area 56 is defined by two edges parallel to the direction 22 and distanced by a length substantially equal to the thickness of the arm 47, for guiding the sliding of the arm 47 itself and to prevent translation of the coupling appendix 46 and, therefore, of the bracket 23 parallel to the direction 37.

[0024] Returning to Figure 4, each bracket 23 comprises a locking tooth 60, which is carried by the wall 44 and has sufficient elasticity for flexing upwards when the wall 44 is placed in contact with the face 21 during insertion and sliding of the connecting appendixes 46 into the openings 24.

[0025] At the end of the sliding of the connecting appendixes 46 along direction 22, the locking teeth 60 are engaged snap-wise by respective retaining seats 61 (fig. 2 and 3) made in the wall 20, so as to prevent the reversal of the connecting appendixes 46 from respective areas 56 of the openings 24 and therefore permanently lock the brackets 23 and the entire expansion tank 1 along direction 22.

[0026] Preferably, the connecting appendixes 46 and the locking teeth 60 are made in a single piece with the walls 44.

[0027] As mentioned above, for assembling the expansion tank 1 on the cross member 7 it is necessary to first insert the pin 33 in the hole 11, until the snapping of the retaining teeth 43 over the edge 39 and the resting of the walls 44 on the wall 20. While the walls 44 are rested on the wall 20, the connecting appendixes 46 must be inserted in the areas 55 of the respective openings 24. The axial holding action exerted by the retaining teeth 43 against the edge 39 allows keeping the walls 44 resting against the wall 20. At this point, while a light downward pressure on the brackets 23 is exerted to maintain deformation of the locking teeth 60, a simple push on the expansion tank 1 along the direction 22 is necessary to insert the connecting appendixes 46 into the bottom of the areas 56, until the locking teeth 60 snap into the respective retaining seats 61. During the sliding of the brackets 23 along the direction 22, the pin 33 can slide into the hole 11 along the axis 13, thanks to the particular shape of the hole 11 itself.

[0028] It is evident that the bayonet-coupling between the brackets 23 and the cross member 7 may be defined by appendixes and/or by openings configured in a different way from that just described, but always so as to perform the same function. For example, it is possible to provide a pair of connecting appendixes arranged on the sides of the bracket 23 and bayonet-coupled to the end edges of the wall 20, without making the openings 24 as intermediate holes, but by making notches along said end edges for inserting the fins 48 below said wall 20.

[0029] In any case, it is evident how the bayonet-coupling, in combination with the snap-wise coupling of the locking tooth 60, allows locking in all directions, the brackets 23 and therefore the expansion tank 1, without using any additional metal connection element.

[0030] The pin 33 in addition to the brackets 23 facilitates the bayonet-coupling during the mounting of the expansion tank 1 and helps to hold the expansion tank 1 in a fixed position with respect to the cross member 7. In particular, the axial holding action exerted by the edge 39 on the retaining teeth 43 and the holding action exerted by the guide surfaces 16 on the pin 33 along the direction 37 are in addition to those exerted by the edges of the openings 24 upon the connecting appendixes 46.

[0031] Therefore, the connection to the cross member 7 is extremely stable and rigid, thus limiting possible breakage and vibration.

[0032] Moreover, the mounting is extremely simple, thanks to the fact that two mounting movements are simply provided, namely a first movement vertically directed downwards, to rest said wall on the cross member 7, and a subsequent second movement directed along the direction 37 to lock the bracket 23 in a vertical direction and, thanks to the locking tooth 60, also along the direction 37 itself.

[0033] Finally, from the above, it is evident that the described and illustrated engine compartment 3 may be subject to modifications and variations which do not depart from the scope of the present invention, as defined in the attached claims.

[0034] In particular, as mentioned above, the various parts of the expansion tank 1 may have a different shape and size from those illustrated by way of example. For example, the connecting appendixes 46 could be replaced by appendixes or slides having an inverted T cross-section, rather than being L-shaped.

[0035] Also, the position of the pin 33 and/or of the brackets 23 may be different from that described above; for example, the pin 33 may be supported by a further bracket fixed with respect to the container 29.

Claims

1. A motor vehicle engine compartment comprising:

- a support structure (7) comprising a wall (20) having:

a) at least one opening (24), and

b) at least one retaining seat (61);

- an expansion tank (1) for a cooling system, the expansion tank comprising:

a) a container (29) adapted to receive a cooling fluid;

b) connecting means for fixing said container (29) to said support structure (7); said connecting means comprising at least one bracket (23), which is fixed with respect to said container (29), laterally protrudes with respect to said container and comprises:

(1) bayonet coupling means (46) defined by at least one connecting appendix (46), engaging said opening (24) and configured so as to couple said bracket (23) to said support structure (7) by way of a first mounting movement, which is directed vertically downwards and allows said bracket (23) to be rested onto said wall (20), and a subsequent second mounting movement, which is directed along a horizontal direction (37) and allows said bracket (23) to be vertically locked;

(2) at least one locking tooth (60) elastically deformable and adapted to engage snap-wise said retaining seat (61) for locking said bracket (23) along the said horizontal direction (37) characterized in that:

- the connecting means comprise a positioning pin (33) which protrudes vertically downwards; and

- said support structure (7) comprises a horizontal protrusion (10) having a vertical hole (11), which is engaged by said positioning pin (33) and defines an elongated slot along a horizontal axis (13) parallel to the horizontal direction (22) of the second mounting movement.

2. The engine compartment according to claim 1, characterized in that said bracket (23) is made of plastic material.

3. The engine compartment according to claim 2, characterized in that said bracket (23) is made in a single piece.

4. The engine compartment according to any one of the preceding claims, characterized in that said connecting appendix (46) is downwardly protruding.

5. The engine compartment according to any one of the preceding claims, characterized in that said connecting means comprise two of said brackets, arranged in positions horizontally spaced apart from each other.

6. The engine compartment according to any one of the preceding claims, characterized in that said positioning pin (33) is vertically and horizontally spaced apart from said bracket (23).

7. The engine compartment according to claim 6, characterized in that said positioning pin comprises an end portion (38), which comprises at least one axial retaining tooth (43), radially protruding outwards, and is elastically deformable, radially inwards.

8. The engine compartment according to claim 6 or 7, characterized in that said positioning pin extends downwards starting from the bottom end (35) of said container (29).

Ansprüche

1. Motorraum eines Motorkraftfahrzeuges, umfassend:

- eine Tragekonstruktion (7), die eine Wand (20) umfasst, mit

a) mindestens einer Öffnung (24), und

b) mindestens einem Rückhaltesitz (61);

- einen Ausgleichstank (1) für ein Kühlungssystem, wobei der Ausgleichstank Folgendes umfasst:

a) einen Behälter (29), der dazu eingerichtet ist, eine Kühlungsflüssigkeit aufzunehmen;

b) Verbindungsmittel zum Befestigen des Behälters (29) an der Tragekonstruktion (7); wobei die Verbindungsmittel mindestens ein Winkelstück (23) umfassen, welches im Verhältnis zu dem Behälter (29) feststehend ist, seitlich im Verhältnis zu dem Behälter hervorsteht und Folgendes umfasst:

(1) bajonettartige Kopplungsmittel (46), die durch mindestens einen Verbindungsansatz (46) definiert sind, der in die Öffnung (24) eingreift und dergestalt ausgestaltet ist, um das Winkelstück (23) mit der Tragekonstruktion (7) mittels einer ersten Montagebewegung zu koppeln, welche vertikal nach unten gerichtet ist und dem Winkelstück (23) ermöglicht, auf der Wand (20) aufzuliegen, und einer darauffolgenden zweiten Montagebewegung, welche entlang einer horizontalen Richtung (37) gerichtet ist, und dem Winkelstück (23) ermöglicht, vertikal verriegelt zu werden;

(2) mindestens einen Verriegelungszapfen (60), der elastisch verformbar und dazu eingerichtet ist, in einrastender Weise mit dem Rückhaltesitz (61) zum Verriegeln des Winkelstücks (23) entlang der horizontalen Richtung (37) einzugreifen

dadurch gekennzeichnet, dass

- die Verbindungsmittel einen Positionierungsstift (33) umfassen, welcher vertikal nach unten hervorsteht; und

- die Tragekonstruktion (7) einen horizontalen Vorsprung (10) mit einem vertikalen Loch (11) umfasst, in welches der Positionierungsstift (33) eingreift und einen länglichen Schlitz entlang einer horizontalen Achse (13) parallel zu der horizontalen Richtung (22) der zweiten Montagebewegung definiert.

2. Motorraum nach Anspruch 1, dadurch gekennzeichnet, dass das Winkelstück (23) aus Kunststoff hergestellt ist.

3. Motorraum nach Anspruch 2, dadurch gekennzeichnet, dass das Winkelstück (23) aus einem Einzelteil hergestellt ist.

4. Motorraum nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Verbindungsansatz (46) nach unten hervorsteht.

5. Motorraum nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verbindungsmittel zwei der Winkelstücke umfassen, die in Positionen horizontal von einander beabstandet angeordnet sind.

6. Motorraum nach irgendeinem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Positionierungsstift (33) vertikal und horizontal von dem Winkelstück (23) beabstandet ist.

7. Motorraum nach Anspruch 6, dadurch gekennzeichnet, dass der Positionierungsstift einen Endabschnitt (38) umfasst, welcher mindestens einen axialen Rückhaltezapfen (43) umfasst, der radial nach außen hervorsteht und radial nach innen elastisch verformbar ist.

8. Motorraum nach Anspruch 6 oder 7, dadurch gekennzeichnet, dass sich der Positionierungsstift von dem Bodenende (35) des Behälters (29) ausgehend nach unten erstreckt.

Revendications

1. Compartiment moteur de véhicule à moteur comprenant :

une structure de support (7) qui comprend une paroi (20) qui comporte :

a) au moins une ouverture (24) ; et

b) au moins un siège de retenue (61) ;

un vase d'expansion (1) pour un système de refroidissement, le vase d'expansion comprenant :

a) un conteneur (29) qui est adapté de manière à recevoir un fluide de refroidissement ;

b) un moyen de connexion pour fixer ledit conteneur (29) à ladite structure de support (7) ; ledit moyen de connexion comprenant au moins une console (23), laquelle console est fixée par rapport audit conteneur (29), fait saillie latéralement par rapport audit conteneur et comprend :

(1) un moyen de couplage à baïonnette (46) qui est défini par au moins un appendice de connexion (46), qui engage ladite ouverture (24) et qui est configuré de manière à coupler ladite console (23) à ladite structure de support (7) au moyen d'un premier mouvement de montage, qui est dirigé verticalement vers le bas et permet que ladite console (23) repose sur ladite paroi (20), et d'un second mouvement de montage subséquent, qui est dirigé suivant une direction horizontale (37) et permet que ladite console (23) soit bloquée verticalement ;

(2) au moins une dent de blocage (60) déformable élastiquement et qui est adaptée de manière à engager par encliquetage ledit siège de retenue (61) pour bloquer ladite console (23) suivant ladite direction horizontale (37),

caractérisé en ce que :

- le moyen de connexion comprend une broche de positionnement (33) qui fait saillie verticalement vers le bas ; et

- ladite structure de support (7) comprend une protubérance horizontale (10) qui comporte un trou vertical (11), qui est engagé par ladite broche de positionnement (33) et définit une fente allongée suivant un axe horizontal (13) qui est parallèle à la direction horizontale (22) du second mouvement de montage.

2. Compartiment moteur selon la revendication 1, caractérisé en ce que ladite console (23) est réalisée en matière plastique.

3. Compartiment moteur selon la revendication 2, caractérisé en ce que ladite console (23) est réalisée selon une unique pièce.

4. Compartiment moteur selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit appendice de connexion (46) fait saillie vers le bas.

5. Compartiment moteur selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit moyen de connexion comprend deux desdites consoles, lesquelles sont agencées au niveau de positions espacées horizontalement l'une de l'autre.

6. Compartiment moteur selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite broche de positionnement (33) est espacée verticalement et horizontalement de ladite console (23).

7. Compartiment moteur selon la revendication 6, caractérisé en ce que ladite broche de positionnement comprend une partie d'extrémité (38), laquelle partie d'extrémité comprend au moins une dent de retenue axiale (43), qui fait saillie radialement vers l'extérieur, et est déformable élastiquement, radialement vers l'intérieur.

8. Compartiment moteur selon la revendication 6 ou 7, caractérisé en ce que ladite broche de positionnement s'étend vers le bas en partant de l'extrémité de fond (35) dudit conteneur (29).

Drawing