FR2850722A1 - Equipment e.g. electronic calculator, fixation device for vehicle, has male unit in one plate/wall engaged in opening of female unit of other, where units form casing by translation and are locked in two perpendicular directions - Google Patents

Abstract

The device has a plate receiving an equipment and another plate fixed on a motor wall. An elastomeric material mass is inserted in the plates to filter the vibration between the equipment and the wall. The latter plate or the wall has a male unit (28) engaged in an opening of a female unit (6) of the other. The units form a casing by translation of one unit relative to the other and are locked in two perpendicular directions.

Description

The present invention relates to a device for fixing equipment

  sensitive to vibrations, on the wall of an element subjected to

  vibrations, such as the wall of an engine.

  When a motor vehicle is moving or when it is stationary with the engine running and at idle, the latter vibrates and fully transmits its own vibrations to all the members and equipment which are rigidly linked to it, directly or indirectly.

  Such vibrations can be detrimental to the operation and / or the life of this equipment. One thinks particularly of those which contain electronic elements.

  To overcome this difficulty, it has been proposed to insert between the equipment and its means of connection to the engine a device commonly called vibration filtration pad.

  Such studs exist in multiple forms, but generally consist of two frames provided with fastening elements such as screws, clipping members, tapping, etc., separated by a mass of overmolded or bonded elastomeric material. The mounting of such studs is generally done by depositing them in appropriate housings provided on the surface of the wall of the motor, and fixing them there directly (using a nut, a screw, or by force 20 of clipping on the stud).

  But such an operation is difficult to perform, because of the small space that exists around the engine. This poses all the more problems if a disassembly / reassembly operation is necessary during the subsequent maintenance of the vehicle. The present invention aims to provide a solution to these problems by proposing a fixing device which can be put in place. place effortlessly and remotely, that is to say according to a component of movement essentially parallel to the surface of the wall of the equipment sensitive to vibrations.

  It is therefore a device for fixing vibration-sensitive equipment to the wall of an element subjected to vibrations, such as the wall of an engine, which is characterized by the fact that it comprises : - a first plate intended to receive said equipment; a second plate intended to be fixed to said wall, these two plates being arranged opposite one another, with the insertion of a mass of elastomeric material capable of filtering vibrations between said equipment and said wall, and that one or the other of the second plate and wall carries at least a fixing member, said male member, capable of engaging in the opening of a female member of the other part, these members being shaped such so that by interlocking consecutive to their approximation, then by translation of one relative to the other, it causes their relative blocking, so that they are locked 10 in two perpendicular directions, pressed against each other .

  Thanks to such a structure, the mounting of the device is facilitated, even if the space for installation is limited.

  In addition, the relative blocking of the male and female organs does not require any additional part, which avoids the risk of loss or assembly error. According to other advantageous and non-limiting characteristics of the invention: - one or the other of said first and second plates is equipped with a handle; - Said second plate is equipped with a handle, and this handle 20 is in one piece with the second plate; - It comprises at least three fixing members; - Said fixing member has the shape of a mushroom, with a body generally perpendicular to the surface of said second plate or of said wall, which is extended by a massive head; - Said fixing member is shaped so as to be able to retract radially; - The periphery of the body of said fixing member is furnished with play compensation fins; the opening of the female member has a "keyhole" shape, that is to say that it consists of two circular portions of different diameters, connected by an intermediate zone which makes them communicate; - Said intermediate zone is a constriction zone forming a hard point; - Said opening is bordered by at least one access ramp intended to make the effort of positioning said fixing member progressive; - the central part of the plates is hollowed out; - Said elastomeric material is natural or synthetic rubber; - Said first plate carries at least one element for fixing said equipment, which is arranged opposite said member for fixing the second plate to the wall; - Said handle has at least one opening for passage of an additional fixing means to the wall, such as a screw.

  Other characteristics and advantages of the invention will appear on reading the following description of a preferred embodiment of the invention.

  This description is made with reference to the accompanying drawings in which: - Figures 1 and 2 are perspective views of the first plate of the device, showing essentially and respectively, its upper and lower faces; - Figures 3 and 4 are perspective views of the second plate of the device, showing essentially and respectively, its upper and lower faces; - Figures 5 and 6 are perspective views showing, in different directions, a device according to the invention which incorporates the plates of Figures 1 to 4; FIG. 7 is a partial view, along a vertical sectional plane, of the second plate, intended to show more precisely the shape of a male organ which equips it; - Figure 8 is a partial perspective view of the wall of an element subjected to vibrations, on which it is proposed to fix a device according to the invention; - Figure 9 is a detail view of an area of said wall, in which it has a fixing opening; - Figures 10 and II are diagrams showing, schematically, the mounting of the device according to the invention, and its associated equipment, on said wall.

  The device according to the invention essentially comprises two plates.

  The first of these, which can be described as an upper plate, is intended to receive the equipment to isolate vibrations.

  It is shown in Figures 1 and 2 attached. In this embodiment, this plate 1 has an approximately triangular outline. This shape is conditioned in particular by the shape of the equipment that it is intended to receive.

  Of course, according to embodiments not shown, it could be rectangular, square, etc. It is a molded plastic or metal part.

  The center of the plate is hollowed out, in particular to reduce the weight.

  It thus consists of three sections 12, 13 and 14, which materialize the sides of the triangle, is three connecting zones 15, 16 and 17 of these 10 sections, which materialize the "angles" of the triangle.

  Its upper and lower faces are respectively referenced 10 and 11.

  From the upper face 10 comes in material, in each of the connection zones 15 to 17, a stud or pin 18. These are partially hollowed-out parts, which extend perpendicular to the general plane in which the plate is contained, intended to come to cooperate with reservations of complementary shape provided in the equipment to isolate vibrations, as will be seen below.

  The lower plate 2 has a main part extended by a handle 3.

  The main part also has a triangular shape, which is sort of the image of that of the first plate in a mirror.

  Its upper and lower faces have been referenced respectively 20 and 21.

  The sections which materialize the sides of the triangular shape are referenced 22, 23 and 24, while the connecting zones of these sections bear the references 25, 26 and 27.

  This last zone 27 makes the junction between the triangular main part and the handle 3, which has a main wall 30 extending in the plane of the plate.

  The wall 30 is bordered by a wall 31 directed at a right angle to the side of the upper face 20. As will be seen below, this wall constitutes a means for the handling of the device by an operator.

  In the wall 30 is provided a circular opening 32 whose function will be explained below.

  The example shown here is that of a handle which is integral with the rest of the plate. However, in a different embodiment and not shown, the handle can be provided in the form of an independent and detachable part, which it is possible to put in place only in the event of assembly or disassembly of the device. similar to the plate 1, from the lower face 20 comes 5 of material, in each of the connection zones 25 to 27, a fixing member, said male member 28.

  They are also partially hollowed-out parts, which extend perpendicular to the general plane in which the plate 2 is contained, intended to come to cooperate with openings provided in the wall to be fitted, as will be seen below.

  These organs are parts of revolution, which have a general shape of mushrooms (see FIG. 7), with a body 280 generally perpendicular to the plane in which the plate 2 is contained, which is extended by a massive head 281, generally parallel to said plane. . The head 281 has a frustoconical shape, which converges as one moves away from the body 280.

  The interior of the members 28 is partially hollowed out, to form a cavity 282 centered on the axis of the body 280. This allows, when pressure is exerted on the periphery of the member, and more particularly on the head 280, in 20 direction of said body, that it retracts radially.

  Of course, this faculty is only given if the plastic which composes them is intrinsically able to deform elastically.

  The periphery of the body 280 is provided with clearance compensation fins 283, the function of which will be explained below.

  The diameter of the head 280, at its widest point, has been identified by the reference dl. This is the diameter at "rest", that is to say when the head is not subjected to any stress tending to compress it radially.

  The reference d2 identifies the diameter at "rest" of the body, at the periphery of the ramps 283.

  The three members 28, when the two plates are superimposed, are located exactly below the nipples or pins 18.

  In the situation which has just been described, we are dealing with three bodies 28. It is of course possible to envisage cases in which this figure is higher. It will preferably not be lower, for reasons of stability. However, in such a case, the "missing" member will be replaced by a shim, as will be seen.

later in the description.

  To manufacture the device according to the invention, the first and second plates 1 and 2 are placed in a mold, the latter being shaped so that the handle 3 is excluded. Seen from above, this mold has a triangular outline, which is complementary to that of the plate 1 and of the main part of the plate 2.

  The plate 1 occupies the highest position in the mold, its face 10, described as superior, being directed upwards.

  The plate 2 occupies, meanwhile, the lowest, its face 21, described as lower, being directed downwards.

  A material capable of filtering vibrations is then injected into the mold, so as to fill the space which separates the two plates. Shims can be placed there, to prevent the material from occupying the internal hollow space of the center of the plates.

  The material used is advantageously rubber, whether natural or synthetic.

  We then obtain a device as shown in Figures 5 and 6. We are therefore dealing with a single piece, with pins 18 which protrude from above, and male organs 28 in the form of mushrooms, which protrude from below. .

  This part is easy to handle, by holding it by the handle 3. In FIG. 8 is partially shown the wall 5 of an element 20 subjected to vibrations, such as the wall of a vehicle engine.

  In this wall are provided three female members which consist of through openings 6.

  Their relative arrangement is identical to that of the male organs, at the level of the plate 2.

  These openings have a so-called "keyhole" shape, which means that they each consist of two orifices in the form of portions of circles and 61, of different diameters, which communicate through an intermediate zone 62.

  The diameter d3 of the orifice 60 is greater than that of the orifice 61 d4. As for the zone 62, its width l is equal to the diameter d4.

  On either side of the orifice 60, in the direction of the throttling zone 62 are provided ascending ramps 63, formed in the wall 5, the function of which will be explained below.

  It should be noted that the three openings 6 are oriented in the same way.

  As can be seen in Figure 8, the wall 5 has threads 53, to which we will return later.

  The mounting of the device according to the invention on the wall 5 is done as follows.

  First, the device is fixed to the equipment E to isolate vibrations. As said above, the latter has reservations 5 not shown, of shape complementary to those of the pins 18. It is a press fitting, the diameter of the reservations being slightly smaller than that of the pins 18. However, their mutual engagement and fixation are possible due to the radial deformation of the latter.

  This operation has been symbolized by the arrow e in FIG. 10. The second step consists in bringing the device (and its associated equipment) closer to the wall 5, in order to fit the male members 28 into the openings 6.

  To do this, the handle 3 is grasped, and the device is brought into a position such that the members 28 are plumb with the orifices of larger diameter 60.

  The diameter d3 of these orifices is equal to or even slightly greater than the diameter d1 of the head of the male organs 28, so that it is possible to engage the organs 28 in the openings 6, as shown by the arrows f in the figure 10.

  The next step consists in imparting to the device a translational movement relative to the wall 5. This translational movement, as shown by the arrows g in FIGS. 10 and 11, takes place parallel to the wall. The axis of movement is directed towards the small diameter orifices 61 of the openings 6.

  In doing so, the body 280 comes into contact with the intermediate zone 62 of the openings. The width l of this zone is less than the diameter 25 d2 of the body of the members 28. However, due to their capacity to retract radially (presence of the cavity 282), the translational movement allows them to pass through this zone and to come fit into the orifice 61. At this level, the diameter d4 is slightly less than d2, so that the body 281 is blocked, in the compressed position. This compression is guaranteed by the presence of the fins 283, which compensate for the possible play due to the production tolerances of the parts.

  The ramps aim to make progressive the effort of setting up the organs 28.

  The device is thus positioned, and perfectly "secured" to the wall. However, a screw can be introduced into the opening 32 of the handle 3, which is located directly above one of the threads 53 of the wall 5.

  This additional attachment is intended to immobilize the device definitively and more particularly to prevent any separation of the device from its support by an unauthorized operator.

  FIG. 9 shows, in broken lines, a variant of the embodiment of the intermediate zone 62.

  It constitutes here a constriction, so that its width 1 is less than the diameter d4.

  In this case, the placement of the members 28 is done in the same manner as that described above. However, the passage of the intermediate throttle zone 62 results in an additional effort to be provided. There is crossing of a hard point.

  The organs are then perfectly blocked and one can dispense with, if necessary, the establishment of a screw in the aforementioned opening 32.

  It will be noted that the fitting of the male and female organs takes place in simple movements, which can be implemented, even if the space available around the wall is reduced.

  This is done without effort, in a remote manner, that is to say according to a movement component essentially parallel to the surface of the wall of the equipment sensitive to vibrations.

  It will be noted that any attempt to separate the device from the wall, in a single movement contrary to the direction of the arrows f, is prevented by the fact that the diameter dl of the head 280 of the members 28 is greater than the diameter d4 of the openings 6.

  This separation can only be done according to a first translational movement directed opposite to the arrows g, then according to a second movement directed opposite to the arrows f.

  In an embodiment not shown, the male 28 and female 6 organs are reversed, which means that the first are carried by the wall 5 and the second by the device.

  In addition, when the female members 6 are part of the wall 5, they do not necessarily form an integral part of the latter, but can be located at the level of legs integral with this wall.

  As said above, in the situation which has just been described, we are dealing with three organs 28. If this figure is lower, the organ (or both organs) "missing" will be replaced by a wedge bearing on the wall 5, so that the stability of the device on the wall is not compromised.

  As an indication, an equipment E capable of cooperating with the device is for example an electronic computer or a metering unit.

Claims (14)

  1. Device for fixing an equipment (E) sensitive to vibrations, on the wall (5) of an element subjected to vibrations, such as the wall (5) of a motor, characterized in that it comprises: - a first plate (1) intended to receive said equipment (E); 5 - a second plate (2) intended to be fixed to said wall (5), these two plates (1; 2) being arranged opposite one another, with intercalation of a mass (M) of material an elastomer capable of filtering vibrations between said equipment (E) and said wall (5), and that one or other of the second plate (2) and wall (5) carries at least one fixing member (28), said male member, capable of engaging in the opening of a female member (6) of the other part, these members (28; 6) being shaped so that by interlocking following their bringing together, then by translation of one relative to the other, it causes their relative blocking, so that they are locked in two perpendicular directions, pressed against each other.   2. Device according to claim 1, characterized in that one or the other of said first and second plates (1; 2) is equipped with a handle (3).   3. Device according to claim 2, wherein said second (2) plate is equipped with a handle (3), characterized in that this handle (3) is in one piece with the second plate (2).   4. Device according to one of claims 1 to 3, characterized in that it comprises at least three fixing members (28).   5. Device according to one of claims 1 to 4, characterized in that said fixing member (28) has the shape of a mushroom, with a body (280) generally perpendicular to the surface of said second plate (2 ) or of said wall (5), which is extended by a solid head (281).   6. Device according to one of claims 4 or 5, characterized in that said fixing member (28) is shaped so as to be able to retract radially.   7. Device according to one of claims 5 or 6, characterized in that the periphery of the body (280) of said fixing member (28) is furnished with play compensation fins (283).   8. Device according to one of claims 1 to 7, characterized in that the opening (6) of the female member has a "keyhole" shape, that is to say 1 1 that it consists of two circular portions (60, 61) of different diameters, connected by an intermediate zone (62) which makes them communicate.   9. Device according to claim 8, characterized in that said intermediate zone (62) are a throttling zone forming a hard point.   10. Device according to claim 8 or 9, characterized in that said opening (6) is bordered by at least one access ramp (63) intended to make the effort of placing said fixing member progressive (28 ).   11. Device according to one of claims 1 to 10, characterized in that the central part of the plates (1, 2) is hollowed out.   12. Device according to one of claims 1 to 11, characterized in that said elastomeric material is a natural or synthetic rubber.   13. Device according to one of claims 1 to 12, characterized in that said first plate (1) carries at least one fixing element (18) of said equipment (E), which is arranged opposite said fixing member ( 28) from the second plate (2) to the wall (5).   14. Device according to one of claims 1 to 13, characterized in that said handle (3) comprises at least one opening (32) for passage of an additional fixing means to the wall (5), such as a screw.