WO2013053476A2

WO2013053476A2 - Mechanical retention system, assembly comprising such a system and an electronic board and method of assembling such a system and such a board on a surface

Info

Publication number: WO2013053476A2
Application number: PCT/EP2012/004259
Authority: WO
Inventors: Guillaume SANVITO; Hubert Lescot; Pierre Smal
Original assignee: Valeo Japan Co, Ltd
Priority date: 2011-10-12
Filing date: 2012-10-12
Publication date: 2013-04-18
Also published as: FR2981537B1; FR2981537A1; WO2013053476A3

Abstract

The invention relates to a system for mechanically retaining an electronic board (4) against a surface (2) of a support (20), characterized in that it comprises a main body (19) intended to come to face the electronic board (4) and having at least one protrusion (11) which extends in a direction such as to hold said electronic board (4) against said surface (2), said body (1) further comprising a member (25) for preassembly with the electronic board (4). The invention also relates to an assembly (35) of such a mechanical retention system (1) and of an electronic board (4). The invention also relates to a method for the assembling on a surface (2) of a support (20), of an electronic board (4), and of a mechanical retention system (1) according to the invention.

Description

Mechanical holding system, an assembly comprising such a system and an electronic card and method of assembly on a surface of such a system and such a card. The technical sector of the present invention is that of electronic card holding systems on a surface. Such a holding system is usually found in a rotating machine for a motor vehicle such as an electric air conditioning compressor. Such a machine includes a housing, an electric motor, a high voltage power board, a low voltage control board and electrical connectors.

A high voltage power source is connected to the power board via electrical conductors. The current arriving on the power board is continuous. Electrical components are arranged on the power board and their role is to transform the direct current into alternating current. Electrical connectors then connect the power card to the electric motor of the rotating machine to transport the alternating current from the power board to the electric motor.

The low voltage control board is powered by a battery providing a low voltage power supply. Electrical components are also arranged on the low voltage control board and their role is to control the electrical components arranged on the power board. These commands are transmitted from the low voltage card to the power card, also via electrical conductors.

Due to the strong currents flowing in the power board and the role of the electrical components disposed thereon, the power board is caused to heat up. It is therefore necessary to dissipate a maximum of heat from this power card. A known solution is to choose on the one hand a power card comprising a heat dissipation substrate on which are mounted electronic components and on the other hand a housing having good thermal conduction properties. The power board is pressed against the housing to dissipate some of the heat generated by the components through the housing. The power card is typically an isolated metal substrate card or SMI card.

To press the power card against the housing, it is known to make holes in the power card, holes in the housing and then screw the power card on the housing. The screws are typically made of a metal material to provide a mechanically strong contact between the board and the case. For reasons of electrical insulation, the card has a safety distance between the holes and the inner part of the board containing the components. A portion of the map is therefore not available for the placement of electronic components and the routing of interconnections between components. In addition, the piercing step of the card and the box complicates the manufacturing process.

The object of the invention is to overcome the aforementioned problems.

It proposes for this purpose a system for mechanically holding an electronic card against a surface of a support, characterized in that it comprises a main body intended to come opposite the electronic card and having at least a protrusion which extends in one direction so as to maintain said electronic card against said surface. Thus, thanks to the invention, it is no longer necessary to screw or fix by any other known fastener the electronic card to the surface. The holding system performs this role by coming to press the electronic card against the surface of the support. In particular, the main body is intended to be fixed to the support. The outgrowth extends in one direction away from the main body.

For example, the main body has at least one portion extending substantially in a plane. The direction along which the protuberance extends is transverse to this plane. In particular, the support is a compressor housing, the surface is a thermal dissipation surface of the housing and the electronic card allows thermal transmission of its components to the heat dissipation surface. With its protrusion, the holding system plate the electronic card against the heat dissipation surface to ensure a thermal transfer of the card to the surface. Thus, it is not necessary to pierce the card and the surface. The heat of the components of the electronic board is transmitted through the heat dissipation surface to a compressor fluid for cooling the components of the electronic board.

According to one aspect of the invention, the body and the protrusion are electrically insulating. Thus, it is not necessary to leave a safety distance around a distal end of the protrusion touching the card. For example, the body and the protrusion are made of a plastic material. Plastic materials have the necessary insulating characteristics to electrically isolate the electronic card while being rigid enough to allow the projection to ensure its role of plating the electronic card against the support surface. Advantageously, said outgrowth is derived from the body. In other words, the body and the excrescence are of the same holding.

For example, the protrusion extends from the main body so that a distal end of the protrusion comes on a periphery of the electronic card.

Advantageously, said distal end has a shoulder intended to cooperate with a peripheral edge of the electronic card. This shoulder makes it possible to accurately position the mechanical holding system relative to the electronic card thanks in particular to its complementary shape with the peripheral edge of the electronic card.

In another example, the protrusion extends from the main body so that a distal end of the protrusion comes to a non device of the electronic card.

According to one aspect of the invention, the outgrowth is a peripheral outgrowth extending from a periphery of the main body.

According to another aspect of the invention, the outgrowth is an intermediate protrusion extending from an intermediate zone of the main body. It will be noted that the intermediate protrusion differs from the peripheral protrusion in that it extends from a non-peripheral portion of the main body, this non-peripheral portion forming said intermediate zone.

According to one aspect of the invention, the system comprises the peripheral outgrowth and the intermediate excrescence.

According to one variant, the intermediate protrusion is not in contact with the peripheral protuberance and thus forms a fulcrum of the electronic card on the surface. Such a solution forms a mechanical stress recovery for example in the center of the electronic card.

According to another variant, the intermediate protrusion is in contact with the peripheral protrusion. In particular, the intermediate protrusion extends between two flanks of the peripheral outgrowth. In this way, the intermediate protrusion divides the mechanical support system into two parts and also divides the electronic card against which it is supported. Advantageously, the intermediate protrusion is molded simultaneously with the peripheral protrusion.

According to another aspect of the invention, the protuberance is a wall. Thus, the force exerted by the protrusion is distributed on a surface of the electronic card. The maintenance of the card is reinforced. According to yet another aspect of the invention, the outgrowth is a rod. Thus, the protrusion can exert a force at a point on the electronic card, for example between two components of the electronic card. According to an exemplary embodiment, the main body has a substantially rectangular shape.

Advantageously, the body comprises at least one eyelet through which a hole for disposing a fixing member for securing the system on the support.

According to one aspect of the invention, said system comprises a preassembly member with the electronic card. Thanks to the pre-assembly member, it is possible to pre-assemble the holding system with the electronic card before disposing them on the support surface, said protrusion still ensuring its role of plating the electronic card against the surface .

According to one embodiment of the invention, the system further comprises electrical conductors intended to conduct a current between the electronic card and the outside of the electronic card, said electrical conductors being held together by said main body, particularly at the of the plane in which at least a portion of the main body extends.

For example, said conductors extend at least in a common plane. For example, said electrical conductors are at least partially embedded in the main body.

It is thus clear that the system according to the invention performs its role of mechanically maintaining an electronic card, in particular in order to guarantee the thermal transfer between the electronic card and a surface of the compressor casing, and also provides an additional role which consists of to carry electric currents (continuous and alternating) to and from the electronic board.

In an alternative embodiment of this embodiment, the distal end of the electrical connectors is located at a distance from the main body greater than the distance from the distal end of the protrusion. Thus, when the holding system comes on the electronic card, the connectors exert on it a constraint. Thus, the welds of the connectors on the electronic board are strengthened.

In a particular example of this variant, the system further comprises assembly members. Thus, the system allows holding and prestressing the connectors before mounting on the support surface. Thus, the connectors can be soldered to the electronic board before mounting on the surface. This avoids welding difficulties related to the environment of the surface, particularly when the surface is a portion of a compressor housing.

In a particular example of this embodiment, the system comprises at least two primary electrical conductors intended to be traversed by a direct current and at least two secondary electrical conductors intended to be traversed by an alternating current, said primary and secondary electrical conductors being at least partly drowned in the body. Thus, the system can conduct direct current from a high voltage power supply battery to the electronic card via the primary electrical conductors and the alternating current transformed by the electronic card from the electronic card to an electric motor via the secondary electrical conductors. It should be noted that the terms "primary" and "secondary" are used to differentiate electrical conductors and do not define order of importance between these conductors.

According to a particular example of this embodiment, said system comprises a signal connector. The system therefore incorporates an additional function to support the signal connector which allows, in particular, to optimize the size of the system and the signal connector relative to a solution where they would be separated.

The invention also relates to a set of an electronic card and a mechanical holding system as described above. According to the invention, at least one protrusion of the holding system is intended to hold the electronic card against a surface of a support.

In particular, the electronic card allows a thermal transmission of its components to the support surface, especially when the surface is a heat dissipation surface.

For example, the electronic board includes electronic components and a heat sink substrate on which the components are mounted.

The heat dissipation substrate is for example a ceramic layer.

The thickness of the ceramic layer is, for example, 1.6 mm.

The electronic card is for example an SMI card (insulated metal substrate). The substrate is then a metal layer separated from the components by an electrically insulating layer.

In one example, the protrusion is a wall that bears on a periphery of the electronic card. Thus, the protrusion plate the electronic card against the surface on the entire periphery of the card. By distributing the transmitted forces of the holding system on the card, the contact between the electronic card and the surface is optimized. In particular, when the surface is a heat dissipation surface, in particular a compressor housing, the heat transfer between the electronic card and the heat dissipation surface is improved.

According to another aspect of the invention, said assembly comprises a resin contained by the protrusion and covering at least a part of the electronic card. The protrusion thus fulfills a role of mold for the resin. The resin is positioned on the electronic card, in particular to protect the electronic components present on the electronic card. Advantageously, said system comprises an intermediate protrusion dividing said assembly into two parts, said resin being contained in at least one of the two parts.

The invention further relates to a method of assembly on a surface of a support, an electronic card and a mechanical holding system as described above. According to the invention:

positioning said system on said surface so that at least one protrusion of said system holds the electronic card on the surface; - Fixing said system on the support.

The invention thus saves time during the assembly process since it is no longer necessary to have a step of drilling the electronic card and the support.

According to one aspect of the invention, the electronic card is positioned on the surface prior to the positioning of said system on the surface. Alternatively, one pre-assembles said system with said electronic card prior to the positioning of said system on the surface using the pre-assembly member formed on the system.

The invention also relates to a system for mechanically holding an electronic card against a surface of a support, characterized in that it comprises a main body intended to come opposite the electronic card and having at least a protrusion which extends in one direction so as to maintain said electronic card against said surface, said body further comprising a preassembly member with the electronic card.

This holding system may have any of the features described above that are compatible with it.

The appended figures will make it clear how the invention can be realized. In these figures, identical references designate similar elements.

It should be noted that the figures disclose the invention in detail to implement the invention, said figures can of course be used to better define the invention where appropriate.

FIG. 1 schematically illustrates, in sectional view, a mechanical support system 1 according to the invention, an electronic card 4 and a housing surface 20. Figure 2 illustrates in the same section as that of Figure 1, an end of an outgrowth 11 of the mechanical support system 1 according to the invention. FIG. 3 is a perspective view of a mechanical holding system 1 according to the invention and an electronic card 4.

FIG. 4 is a detailed sectional view of a pre-assembly member 25, illustrated in FIG. 3, of the mechanical holding system 1 with the electronic card 4.

The invention can be applied in a support such as a housing 20 as shown in FIG. 1. Such a housing 20 is, for example, a rotary machine housing 20 arranged, in particular, in a vehicle.

The housing 20 has a recess 3 adapted to receive a high voltage power card, such as an insulated metal substrate card or SMI card 4. In the remainder of the description, we will call it card SMI 4. A holding system mechanical 1 according to the invention comes in vis-à-vis the SMI card 4 to hold against a surface 2 of the housing 20. The surface 2 is in particular a heat dissipation surface.

The mechanical support system 1 comprises a main body 19, electrically insulating. The main body 19 has a portion extending substantially along a plane 31, called the common plane. The main body 19 comes opposite the SMI card 4.

In one embodiment, the body 19 has openings in the common plane 31. For example, the body 19 is present only on the periphery of the mechanical holding system 1 as shown in Figure 3, thus forming a strapping.

In another embodiment shown in FIG. 1, the body 19 is solid along the common plane 31, that is to say that the material constituting the body 19 extends in the common plane 31 without there being has transverse opening to plane 31 present in this one.

By convention and to simplify the description of the mechanical support system 1 and the other elements according to the invention, a Cartesian coordinate system (x, y, z) is formed and the direction ox is defined as being the direction of the length of the portion. the main body 19 extending substantially along the plane 31, oy the direction of the width of this portion, and oz the direction perpendicular to the plane defined by the directions ox and oy. The SMI board 4 comprises electrical power components, for example, transistors whose role is to transform direct current into alternating and three-phase current since, in one embodiment, this SMI board 4 controls the power supply to a motor with three separate windings. In particular, the common plane 31 is parallel to the plane in which the SMI card 4 extends.

The direct current is supplied to the SMI board 4 from a high voltage electrical source (not shown), in particular an electric motor supply battery which moves a vehicle in which the case 20 is located. The voltage supplied by this electrical source high voltage is for example between 80 and 600 volts.

The mechanical support system 1 as schematically represented in FIG. 1, has, according to the invention, at least one protrusion 11 which extends in a direction transverse to the plane 31 and which is able to press the SMI card 4 against the surface 2 of the housing 20 to ensure a heat transfer 6 of the SMI card 4 to the housing 20. The direction in which the protrusion extends 1 1 is, in particular, perpendicular to the plane 31, that is to say it is parallel to the axis oz and the protrusion 11 extends in this case in a rectilinear plane. Of course, the invention covers the case where the protrusion 11 is inclined with respect to the plane 31.

The protrusion 11 is for example integral with the body 19 of the mechanical support system 1. It is understood here that the protrusion 11 and the body 19 are made unitarily, that is to say they are molded simultaneously from the same material. This material is, advantageously, a plastic material chosen for its electrical insulation and rigidity qualities in order to maintain the SMI board 4. The protrusion 11 is, in particular, full of material, that is to say that it does not have an opening crossing it.

The mechanical support system 1 is also attached to the housing 20 by means of one or more fasteners 12, including screws 12 '. These screws 12 'pass through holes 37 present in eyelets 13 protruding from a periphery of the mechanical support system 1 in particular projecting from the body 19. The eyelets 13 extend, in particular, in a plane parallel to the common plane 31. The mechanical support system 1 could also be fixed on the housing 20, for example, by riveting or gluing. In particular, the mechanical support system 1 comprises four eyelets 13.

The advantage of the mechanical support system 1 according to the invention will be better understood in what follows.

The transistors 5 present on the SMI board 4 transform the direct current into an alternating and three-phase current intended to power an electric motor. During this "chopping" operation of the AC and three-phase direct current, heat is released by the transistors 5. This heat must be dissipated in order to avoid overheating of the electrical power components and in particular the transistors 5. L protrusion 11 of the mechanical support system 1 presses the SMI card 4 so as to keep it in contact with the surface 2 of the housing 20. Thus, the protrusion 11 plates the SMI card 4 against the surface 2 of the housing 20 so that the heat transfer 6 between the SMI card 4 and the housing 20 can take place.

One can further choose a SMI card 4 and a housing 20 having thermal conduction properties improving the cooling of the components. For example, the housing 20 is made of metal, and in particular aluminum or aluminum alloy, or even copper. The heat of the components is thus transmitted to the casing 20 via the card SMI 4 and this heat transfer is represented in FIG. 1 by the arrow 6. The mechanical support system 1 according to the invention may comprise one or more protrusions 11, extending in a plane inclined with respect to the plane 31. According to an exemplary embodiment of the invention and as visible in Figure 1, the protrusion, is, in particular, on the periphery of the mechanical support system 1, in particular on the periphery of the main body 19. The protrusion, located on the periphery of the mechanical support system 1, peripheral protrusion 11 '. It is understood that the peripheral protrusion 1 'is born on the periphery of the mechanical support system 1 and plate, at a distal end 14 of the peripheral protrusion 11', the card SMI 4 against the surface 2 of the housing 20.

In particular, the peripheral protrusion 11 'maintains the SMI card 4 at a peripheral edge 16 of the SMI card 4. FIG. 2 shows a detailed view of the location where the distal end 14 of the peripheral protrusion 11 ', plate the SMI card 4 against the surface 2 of the housing 20. According to one aspect of the invention, the peripheral protrusion 11' has at its distal end 14 a shoulder 15 adapted to cooperate with the peripheral edge 16 of the card SMI 4. The shoulder 15 corresponds, for example, to a notch made at the distal end 14 of the peripheral protrusion 11 '. The shoulder 15 has, in particular, two mutually perpendicular surfaces, extending respectively in a plane parallel and in a plane perpendicular to the plane 31 defined by the axes ox and oy, and able to conform to two surfaces of the peripheral edge 16 ' extending in the same planes as the two surfaces of the shoulder 15 described above.

Advantageously, and as can be seen in FIG. 3, the protrusion 11 lies, in particular, on an intermediate zone of the mechanical holding system 1, in particular of the main body 19. The protrusion, located on the intermediate zone of the mechanical support system 1, intermediate protrusion 11 ", the mechanical support system 1 may thus comprise at least the peripheral protrusion 11 'and / or at least the intermediate protrusion 11". The intermediate zone of the mechanical holding system 1 is understood to mean an area delimited by the periphery of the mechanical holding system 1, in particular of the main body 19. In other words, the intermediate protrusion 11 "extends in a volume delimited by the peripheral growth 1 1 'and divides this volume in two In the case where the mechanical support system 1 comprises several intermediate excrescences 1 1 ", they share the volume delimited by the peripheral protrusion 11' in several volumes.

The intermediate protrusion 11 "can press the SMI card 4 at an intermediate zone of the SMI card 4, in particular in the middle of the SMI card 4. The intermediate protrusion 1 1" thus proposes a resumption of efforts of the mechanical support system 1 on the intermediate zone of the SMI card 4, in particular in the middle, to ensure contact with the housing 20, possibly in addition to the proposed force recovery at the periphery of the SMI card 4 by the peripheral protrusion 11 'of the mechanical support system 1.

This intermediate protrusion 11 "extends, in particular, from a first flank 21 of the peripheral protrusion 11 'to a second flank 22 of the peripheral protrusion 11'.

In the case illustrated in Figure 3, the main body 19 of the mechanical holding system 1 is rectangular. The peripheral protrusion 1 1 'which follows the periphery of the mechanical support system 1 is also rectangular. The intermediate protrusion 11 "extends in this case from the first flank 21 of the peripheral outgrowth 11 'corresponding to a first large side of the rectangle towards the second flank 22 of the peripheral outgrowth 1' corresponding to a second major The intermediate protrusion 1 1 "divides the mechanical holding system 1 into two parts and thus makes it possible to delimit two distinct zones 4a, 4b on the SMI card 4. The card SM I 4 is thus pressed against the surface 2 of the housing 20 by the peripheral protrusion 1 1 'has on the periphery of the body 19 in the form of rectangle and also by the intermediate protrusion 11 ". It has been seen previously that one of the functions of a mechanical holding system 1 according to the invention is to ensure the mechanical strength of the SMI card 4. In the examples presented in FIGS. 1 and 3, the direct electric current coming from the high voltage electrical source is guided towards the SMI board 4 via electrical connectors 17 ', 17 "included in the mechanical holding system 1. In these examples, another function of the holding system 1 is therefore to carry a electrical energy from a first point to a second point via the conductors 17 ', 17 ". At least two primary electrical conductors 17 'are thus intended to conduct a direct current from the electrical source to the SMI card 4.

Thus, the transistors 5 present on the SMI board 4 transform the direct current into an alternating and three-phase current which is then guided, via at least two secondary electrical conductors 17 ", to an electric motor (not shown The electric motor drives, for example, a compression mechanism of an air conditioning compressor.

The primary conductors 17 'are connected on one side of the body 19 to the high voltage electrical source and on the other side to the SM I board 4. The secondary conductors 17 "are connected on one side of the body 19 to the electric motor and on the other side of the board SM I 4. The mechanical support system 1 ensures the mechanical strength of the conductors 17 ', 17 ". The conductors 17 ', 17 "extend in the mechanical support system 1 at least in the common plane 31, while being held by the mechanical support system 1.

The primary conductors 17 ', secondary 17 "are of similar shape, they extend at least partly in the common plane 31 and they have branches 33 transverse to the common plane 31 connected to the SMI card 4.

In FIG. 3, the part of the conductors 17 ', 17 "extending in the common plane 31 is free The conductors 17', 17" are held by the body 19, only present on the periphery of the mechanical support system 1. In Figure 1, there is material constituting the body 19 all around the portion of the conductors 17 ', 17 "extending in the common plane 31. The primary conductors 17' and secondary 17" are thus at least partly embedded in the body 19. This is in particular a part of the primary conductors 17 'and secondary 17 "which extends in the common plane 31 which is embedded in the body 19.

In order to control the operations, in particular, transistors 5, a low voltage control card 7 can be connected to the SMI card 4. As shown in FIG. 1, the control card 7 is, for example, related to the mechanical holding system. 1, above this one. The control card 7 is fixed to the mechanical holding system 1, in particular with the aid of screws 8. For this purpose, it is for example provided on the mechanical support system 1, reinforcements 8 'able to receive the screws 8. The control card 7 extends for example along the axis ox.

The control card 7 receives current from a low voltage electrical source (not shown), in particular a conventional vehicle battery via low voltage conductors 18. Such a battery provides the control card 7 with a voltage, for example example, between 5 and 15 volts.

The conductors 18 of the control card 7 may also be included in the mechanical holding system 1. These conductors 18 then have characteristics similar to the primary conductors 17 'and secondary 17 ".

The card 7 has electrical components 9 controlling the transistors 5 located on the SMI card 4, via intermediate connectors 10 going from the control card 7 to the SMI card 4. The SMI 4 and control cards 7 comprise printed circuits that connect together the various elements arranged on the cards 4, 7 (electrical power components, control, intermediate connector 10, transistors 5, electrical conductors). The whole map SMI 4 and the map 7 is called inverter 32. It is therefore the inverter 32 that drives and electrically controls the electric motor to which the SMI card 4 is connected.

The mechanical holding system 1 may also comprise a signal connector 23. This signal connector 23 makes it possible to interface the control card 7 with external circuits. The signal connector 23 is located at a longitudinal end of the mechanical holding system 1. In the case where the mechanical holding system 1 is rectangular, the signal connector 23 is located, for example, at the first small side 24 of the rectangle. The signal connector 23 is located in a piece integral with the body 19 of the mechanical holding system 1 and projecting from the short side 24.

The mechanical support system 1 according to the invention may further comprise a pre-assembly member 25 with the SMI card 4.

Such a pre-assembly member 25 is shown in more detail in FIG. 4. The pre-assembly member 25 comprises, for example, an inverted "L" shaped extension 26. A small branch 27 of the extension 26 at "L" originates at the peripheral outgrowth 11 'and extends outwardly of the mechanical support system 1 in a plane parallel to the common plane 31. A large branch 28 of the extension 26 in "L" is transverse to the small branch 27, in particular, perpendicular to the small branch 27. The large branch 28 moves towards the map SMI 4 and exceeds it. At the distal end of the large branch 28 is a tooth 29 which cooperates with the peripheral edge 6 of the SMI card 4. The pre-assembly member 25 thus staples the mechanical support system 1 to the SMI card 4.

The invention also relates to an assembly 35 illustrated in Figures 1 and 3, comprising at least one SMI card 4 and a mechanical holding system 1 as described above. According to the invention, at least one protrusion 1 1 of the mechanical holding system 1 is able to press the SMI card 4 against the surface 2 of the housing 20, in particular at a periphery of the SMI card 4 and in particular on the peripheral edges 16 of the SMI card 4. Advantageously, the protrusion 1 plates the SMI card 4 against the surface 2 of the housing 20 over the entire periphery of the SMI card 4.

FIG. 2 also illustrates an aspect of the invention according to which the assembly 35 comprises a resin 36 contained by the protrusion 11 and covering the SMI card 4. By this is meant that resin 36 is disposed on the SMI card 4 and that it is maintained via the outgrowth 11. The outgrowth 1 1 thus plays an additional role of mold for the resin 36.

When placed on the SMI board 4 the resin 36 is in liquid form. It can thus include electrical components. It stiffens thereafter to form a protective layer against any element that could potentially damage the various electrical components present on the SMI card 4.

In the exemplary embodiment illustrated in FIG. 3, the intermediate protrusion 11 "divides the assembly 35 into two parts, the intermediate protrusion 11" dividing in particular the SMI card 4 into a first part 4a and a second part 4b. . The resin 36 is an expensive material, it is then possible thanks to the intermediate protrusion 11 "to choose only the part 4a, 4b that it is desired to protect, without having to have the resin 36 on the two parts 4a, 4b Thus, it is then possible to choose to dispose of the resin 36 on the first part 4a, on the second part 4b, or on the two parts 4a, 4b of the card SMI 4. The peripheral protrusion 1 1 'form then a pattern, otherwise called mold, of reduced size, which avoids casting resin 36 throughout the housing 3 but only on the first part 4a and / or the second part 4b.The invention also relates to a method of assembly of an electronic card and a mechanical holding system according to the invention on a surface of a support An example of a method according to the invention relates to the assembly in the housing 20, the SMI card 4 and the mechanical holding system 1 as described p reviously.

This method comprises a first step in which the mechanical support system 1 is positioned on the housing 20 so that the protrusion 1 of the mechanical support system 1 plates the SMI card 4 on the surface 2 of the housing 20.

This method comprises a second step in which the mechanical support system 1 is fixed on the housing 20. It is fixed in particular by means of the fasteners 12, for example screws 12 'which are screwed through the holes 37 present in the eyelets 13.

It is possible to carry out a step prior to the first step of the method and corresponding to the variant embodiment illustrated in FIG. 1, the preliminary step according to which the SMI card 4 is positioned on the surface 2 of the case 20. In this case, the SMI card 4 is positioned on the surface 2 before being pressed against it by the mechanical support system 1.

Alternatively to the variant described in the preceding paragraph, it is possible to perform another step prior to the first step of the method, and corresponding to the embodiment variant illustrated in FIG. 3, the preliminary step according to which the mechanical holding system 1 is pre-assembled. with the SMI card 4 using the pre-assembly member 25 formed on the mechanical support system 1. In this case, it is the assembly 35 which is positioned directly on the surface 2 of the housing 20. Positioned on the surface 2 of the housing 20, in a single mounting step, both the SMI card 4 and the mechanical support system 1.

In one example, the assembly 35 furthermore comprises the control card 7. The SMI card 4 and the control card 7 then form an inverter 32. It is then positioned in the housing 20, in a single mounting step, at the both the inverter 32 and the mechanical support system 1.

The method according to the invention may be associated with any of the characteristics described above in connection with the mechanical support system 1 or the assembly 35 according to the invention.

We have seen that a mechanical support system 1 according to the invention finds application in a rotating machine arranged in a vehicle. Such a machine is for example an electric air conditioning compressor for motor vehicle. In this application, a refrigerant fluid is conventionally circulated inside an air conditioning circuit via the compressor. This compressor comprises a housing 20 as described above, which receives the SMI card 4.

This housing 20 is then attached to another housing that encloses the electric motor driving a compression mechanism, the electric motor being powered by the SMI card 4 as seen above, itself connected to the high voltage electrical source, for example by the mechanical holding system 1 as described above when it comprises electrical conductors 17 ', 17 ".

The system 1 may comprise a pre-assembly member 25. The pre-assembly member 25 has been described in a particular form. However, this pre-assembly member 25 can take any form capable of ensuring a fastening of the system 1, in particular of the body 19, with the card 4 before a plating of the card 4 on the surface 2. In particular, the body 19 comprises the pre-assembly member 25. The pre-assembly member 25 is in particular positioned at a distal end of the peripheral protrusion 11 '. The pre-assembly member 25 may be in one piece with the body 19, in particular with the distal end of the peripheral protrusion 11 '.

Claims

1. System for mechanically holding an electronic card (4) against a surface (2) of a support (20), characterized in that it comprises a main body (19) intended to come opposite each other of the electronic card (4) and having at least one protrusion (11) which extends in one direction so as to maintain said electronic card (4) against said surface (2), said body (1) further comprising an organ pre-assembly (25) with the electronic card (4).

2. System (1) according to claim 1 wherein the body (19) and the protrusion (11) are electrically insulating.

3. System (1) according to claim 1 or 2 wherein said protrusion (11) is derived from the body (19).

4. System according to one of claims 1 to 3, wherein the protrusion (11 ') extends from the main body (19) so that a distal end of the protrusion (11') comes on a periphery of the electronic card (4).

5. System (1) according to claim 4, wherein said distal end (14) has a shoulder (15) for cooperating with a peripheral edge (16) of the electronic card (4).

6. System according to one of claims 1 to 3, wherein the excrescence

(1 1 ") extends from the main body (19) so that a distal end of the protuberance (11") comes to a non-peripheral portion of the electronic card (4).

7. System (1) according to any one of claims 1 to 6, wherein the protrusion (1 1) is a peripheral protrusion (11 ') extending from a periphery of the main body (19).

8. System (1) according to any one of claims 1 to 6, wherein the protrusion (11) is an intermediate protrusion (11 ") extending from an intermediate zone of the main body (19).

9. System (1) according to claims 7 and 8, comprising the peripheral outgrowth (1 ') and the intermediate protrusion (1 1 "), and wherein the intermediate protrusion (11") extends between two flanks (21, 22) of the peripheral outgrowth (11 ').

10. System (1) according to any one of the preceding claims wherein the protrusion (11) is a wall.

11. System (1) according to any one of claims 1 to 9 wherein the protrusion (11) is a rod.

12. System (1) according to any one of the preceding claims wherein the body (9) has a substantially rectangular shape.

13. System (1) according to any one of the preceding claims, wherein the body (19) comprises at least one eyelet (13) through which a hole to have a fixing member for securing the system ( 1) on the support (20).

14. System (1) according to any one of the preceding claims further comprising electrical conductors (17 ', 17 ") intended to conduct a current between the electronic card (4) and the outside of the electronic card (4) said electrical conductors (7 ', 17 ") being held together by said main body (19).

15. Assembly (35) of an electronic card (4), and a mechanical support system (1) according to any one of the preceding claims, wherein at least one protrusion (1 1) of the holding system ( 1) is intended to hold the electronic card (4) against a surface (2) of a support (20).

16. The assembly (35) of claim 15, wherein said assembly (35) comprises a resin (36) contained by the protrusion (11) and covering at least a portion of the electronic card (4).

The assembly (35) according to claim 16, wherein said system (1) comprises an intermediate protrusion (11 ") dividing said assembly (35) into two parts, said resin (36) being contained in at least one of the two parts .

18. A method of assembling on a surface (2) a support (20), an electronic card (4), and a mechanical holding system (1) according to any one of claims 1 to 14 characterized in that

- Positioning said system (1) on said surface (2) so that at least one protrusion (11) of said system (1) holds the electronic card (4) on the surface (2);

- Fixing said system (1) on the support (20).

19. The method of claim 18, wherein said system (1) is pre-assembled with said electronic card (4) prior to the positioning of said system (1) on the surface (2) by means of the pre-assembly member. assembly (25) formed on the system (1).