WO2021249694A1

WO2021249694A1 - Mechanical contact component for a contact blade of a printed circuit with a stator winding of a fan device motor for a heating, ventilation and/or air-conditioning installation of a motor vehicle and manufacturing method

Info

Publication number: WO2021249694A1
Application number: PCT/EP2021/061359
Authority: WO
Inventors: Geoffroy CAPOULUN; Nicolas Siffrein-Blanc
Original assignee: Valeo Systemes Thermiques
Priority date: 2020-06-10
Filing date: 2021-04-29
Publication date: 2021-12-16
Also published as: FR3111486A1

Abstract

A mechanical electrical-contact component (44) is intended to be fixed on an electronic board (42), in order to place a printed circuit on the electronic board (42) in contact with an electrical contact blade (45), in particular an electrical contact blade (45) with a stator winding of an electric motor (14) of a fan (10). The mechanical electrical-contact component (44) comprises a first tab (64) with a first portion (641) intended to be fixed flat on the electronic board (42); a second tab (66) with a first portion (661) intended to be fixed to the electrical contact blade (45); and a third elastic tab (68), between the first tab (64) and the second tab (66). The first portions (64₁; 66₁) of the first and second tabs (64; 66) extend in two separate, in particular inclined, planes (P1; P2).

Description

CONTACT MECHANICAL COMPONENT FOR CONTACT BLADE OF A PRINTED CIRCUIT BOARD WITH A STATORIC WINDING OF A VENTILATION DEVICE MOTOR FOR HEATING, VENTILATION AND / OR AIR CONDITIONING OF A MOTOR VEHICLE AND PROCESS FOR

MANUFACTURING

Technical area

The present description relates to a mechanical contact component for the contact blade of a printed circuit board with a stator winding of a ventilation device motor for heating, ventilation and / or air conditioning installation of a motor vehicle and to a method of manufacturing such a mechanical component. The present description also relates to an assembly of a printed circuit board and at least one such mechanical contact component fixed to the printed circuit board, and to a fan for heating, ventilation and / or air conditioning installation. motor vehicle, comprising such an assembly.

Prior art

It is known to use a printed circuit board to control a device. For example, a fan motor for a heating, ventilation and / or air conditioning installation of a motor vehicle comprises such a card, to control the rotation of the fan motor.

Electronic and / or mechanical components are attached to this printed circuit board to form an electronic control circuit. To do this, electronic and / or mechanical components traditionally include one or more contact lugs with a track etched on the printed circuit board. These tabs are generally soldered to the printed circuit board, in particular by wave soldering. To do this, these tabs pass through the printed circuit board.

[0004] Furthermore, the electronic control circuit is in contact with the coils of the stator, for example three in number, by means of blades extending perpendicular to the printed circuit board. These blades are fixed to the printed circuit board by means of a mechanical electrical contact component (in English “leadframe”, sometimes translated into French as “conductor-beam” or “connection grid”). This mechanical electrical contact component generally consists of a metal plate cut and bent to form a tab perpendicular to the plane of the printed circuit board, intended to be fixed to a blade, and a plurality of fixing lugs intended to be inserted into holes through the circuit board. The brackets usually take the form of thin rods. The fixing lugs are thus intended to ensure electrical contact of the mechanical contact component with the electronic control circuit on the electronic card.

[0005] To ensure satisfactory electrical contact, the fixing solder must extend all around each fixing lug. To do this, the four sides of each contact tab must be covered with a layer of tin. Thus, each mechanical electrical contact component must be bathed in a tin bath after it has been shaped. This step is expensive.

[0006] Other methods of attaching a mechanical electrical contact component to a printed circuit board have been tested. In particular, so-called surface mounting techniques (called TMS, from the English "Surface Mount Technology" or SMT). In this case, the mechanical electrical contact component has no tabs, but has a flat surface intended to be soldered to the card, in particular on the face of the card, on which the control circuit is engraved.

[0007] Attempts to use the surface mount technique for assembling the contact blades, however, have proved unsuccessful. Indeed, the attachment of the contact blade to the mechanical electrical contact component is achieved while a relatively high transverse stress is applied to the mechanical electrical contact component. TMS techniques do not make it possible to produce a fastening that will sustainably support this transverse stress.

An aim of the present description is to provide a mechanical electrical contact component which does not have at least some of the drawbacks of known mechanical electrical contact components. Disclosure of the invention

[0009] To this end, there is described a mechanical electrical contact component, intended to be fixed on an electronic card, in order to bring a printed circuit on the electronic card into electrical contact with an electrical contact blade, in particular a blade of electrical contact with a stator winding of an electric motor of a fan of a heating, ventilation and / or air conditioning installation of a motor vehicle, the mechanical electrical contact component comprising a first tab with a first portion intended to be fixed flat on the electronic card, a second tab with a first portion intended to be fixed to the electrical contact blade, the first portions of the first and second tabs extending in two distinct planes, in particular two planes inclined one by one relative to the other, and, between the first tongue and the second tongue, a third elastic tongue, the third tongue preferably being curved nce. [0010] Thus, advantageously, the third elastic tab makes it possible to cushion the effect of a stress exerted on the first portion of the second blade, at the level of the first portion of the first blade.

Preferably, the mechanical contact component has one or more of the following characteristics, taken alone or in combination: the mechanical electrical contact component further comprises at least one tab for fixing to the electronic card, preferably a plurality of tabs. attachment, extending in a direction substantially normal to the first portion of the first tongue;

- the first tongue is connected to a first frame extending around the first tongue, the first frame being substantially parallel to the first portion of the first tongue, the first tongue preferably comprising a second portion, folded, in particular in "S" », Connecting the first frame to the first portion of the first tab;

- an opening extends between the first tab and the first frame, at least on three sides of the first tab;

- the second tongue is connected to a second frame extending around the second tongue, the second frame being coplanar with the second tongue, in particular with the first portion of the second tongue, an opening preferably extending between the second tongue and the second frame, at least on three sides of the second tongue;

- the third tab connects the first frame and the second frame;

the first and second tabs, respectively the first and second frames, where appropriate, form an angle greater than or equal to 100 ° and / or less than or equal to 120 °;

- When the first portion of the first tongue is disposed horizontally, the center of gravity of the mechanical electrical contact component is disposed horizontally between the vertical straight lines each passing through one end of a respective fixing lug;

the mechanical electrical contact component comprises two additional contact zones, intended to be in contact with an electronic card concomitantly with the first portion of the first tab;

- Each fixing tab has an extra thickness in the vicinity of its free end, each tab preferably having an opening passing through the tab at the level of the extra thickness;

- the or each fixing lug extends from the first frame;

- the free end of the first tab defines the first portion of the first tab;

the third tab has a width less than or equal to the width of the first frame and / or to the width of the second frame;

- The third tab has a width greater than or equal to the width of the sides of the frame;

- the width of the sides of the frame is greater than or equal to 2.7 mm;

the second tongue has a second portion connecting the second frame to the first portion of the second tongue, the width of the second portion of the second tongue being less than or equal to the width of the first portion of the second tongue;

the second tongue has a bending, the bending preferably being substantially in the center of the first portion of the second tab;

the first tongue comprises a portion extending substantially perpendicular to the first portion of the first tongue; - The third tongue comprises a first portion, parallel to the first portion of the first tongue, the first portion of the third tongue being at least partly opposite the first portion of the first tongue;

the third tongue comprises a second portion in "U" between said one portion of the first tongue and the first portion of the third tongue;

- the third tongue comprises a "U" -shaped portion, connecting the first portion of the third tongue to the second tongue, in particular to the first portion of the second tongue;

- the width of the "U" -shaped portion of the third tongue is substantially equal to the width of the first portion of the third tongue, the width of the first portion of the third tongue preferably being less than the width of the first portion of the first tab;

- the third tongue forms at least one corrugation, preferably two corrugations, connecting said one portion of the second tongue to the second tongue, in particular to the first portion of the second tongue, the part of the third tongue forming corrugation / s being more preferably of a width less than the width of the first portion of the first tongue and / or the width of the first portion of the second tongue; and

- the third tongue comprises at least one bend whose radius of curvature is greater than or equal to 1.5 times the thickness of the third tongue.

According to another aspect, there is described a set of mechanical electrical contact components, comprising a plurality of mechanical electrical contact components, all as described above in all their combinations, in which the mechanical electrical contact components are stacked, the mechanical electrical contact components preferably all being identical.

The fixing lugs of a first mechanical electrical contact component may be in contact with the first frame of a second mechanical electrical contact component, on which the first mechanical electrical contact component is stacked and / or the second frame of a first mechanical electrical contact component may be in contact with the second frame of a second mechanical component, on which the first mechanical electrical contact component is stacked. According to another aspect, there is described an assembly of a printed circuit board and at least one mechanical electrical contact component as described above in all its combinations, fixed on the printed circuit board of such that the first portion of the first tab is fixed to the printed circuit board, in contact with a track of the printed circuit, by implementing a surface mounting technique.

According to yet another aspect, there is described a fan for a motor vehicle heating, ventilation and / or air conditioning installation, comprising a rotor, a stator with at least one stator winding, an assembly of a printed circuit board and at least one mechanical electrical contact component as described above in all its combinations, and at least one electrical contact blade in electrical contact with the at least one stator winding, on the one hand, and with the first portion of the second tab of the mechanical electrical contact component, on the other hand.

According to another aspect, there is described a method of manufacturing a mechanical electrical contact component, as described above in all its combinations, comprising the steps of:

- provide a metal plate, preferably covered with a layer of tin;

- Making one or more cutouts in the plate to form at least one blank of mechanical contact component in the plate; and

- bending the blank of the plate to form the mechanical electrical contact component.

Brief description of the drawings

[0016] Other features, details and advantages of the invention will become apparent on reading the detailed description below, and on analyzing the accompanying drawings, in which:

Figure 1 schematically shows in perspective a fan device;

Figure 2 is a schematic perspective view of an example of a motor that can be implemented in the fan device of Figure 1; Figure 3 is a schematic view from a different perspective, of the example engine of Figure 2;

Figure 4 is a perspective view of a rotor support implemented in the engine of Figures 2 and 3;

Figure 5 is a perspective view from below of the engine of Figures 2 and 3, in which the engine cover has been removed;

Figure 6 is a perspective view from below of the fan device of Figure 1;

Figure 7 schematically illustrates the outer face of the engine cover of Figures 2 and 3; and

Figure 8 shows in perspective an example of a mechanical component of electrical contact;

Figure 9 shows a front view of the mechanical electrical contact component of Figure 8;

Figure 10 illustrates a top view of the mechanical electrical contact component of Figures 8 and 9;

Figure 11 illustrates a side view of the mechanical electrical contact component of Figures 8 to 10;

Figure 12 schematically illustrates a set of mechanical electrical contact components similar to that of Figures 8 to 11, stacked;

[0029] Figure 13 shows a flowchart of a method of manufacturing an electrical contact mechanical component according to Figures 8 to 11;

Figure 14 schematically shows a metal plate comprising blanks of mechanical electrical contact components according to Figures 8 to 11, following a first step of the method of Figure 13;

[0031] FIG. 15 schematically represents a blank of a mechanical electrical contact component according to FIGS. 8 to 11, following a second step of the method of FIG. 13; Figure 16 shows in perspective a first variant of the mechanical electrical contact component of Figures 8 to 11;

[0033] FIG. 17 represents a side view of the first variant of the mechanical electrical contact component of FIG. 16; Figure 18 shows a detail of Figure 17;

Figure 19 shows in perspective a second variant of the mechanical electrical contact component of Figures 8 to 11;

[0036] FIG. 20 represents a side view of the second variant of the mechanical electrical contact component of FIG. 19; Figure 21 shows in perspective a third variant of the mechanical electrical contact component of Figures 8 to 11;

[0038] FIG. 22 represents a side view of the third variant of the mechanical electrical contact component of FIG. 21;

Figure 23 shows in perspective a fourth variant of the mechanical electrical contact component of Figures 8 to 11;

[0040] FIG. 24 represents a side view of the fourth variant of the mechanical electrical contact component of FIG. 23;

Figure 25 shows in perspective a fifth variant of the mechanical electrical contact component of Figures 8 to 11; [0042] FIG. 26 represents a side view of the fifth variant of the mechanical electrical contact component of FIG. 25;

Figure 27 shows in perspective a sixth variant of the mechanical electrical contact component of Figures 8 to 11;

Figure 28 shows in perspective a seventh variant of the mechanical electrical contact component of Figures 8 to 11;

Figure 29 shows in perspective an eighth variant of the mechanical electrical contact component of Figures 8 to 11;

FIG. 30 represents a side view of the eighth variant of the mechanical electrical contact component of FIG. 29; Figure 31 shows in perspective a ninth variant of the mechanical electrical contact component of Figures 8 to 11; and

FIG. 32 represents a side view of the ninth variant of the mechanical component for electrical contact of FIG. 31.

Description of embodiments

In the remainder of the description, identical elements or elements of identical function bear the same reference sign. For the sake of brevity of the present description, these elements are not described in detail in each embodiment. On the contrary, only the differences between the variant embodiments are described in detail.

FIG. 1 illustrates a fan 10 for a heating, ventilation and / or air conditioning installation for a vehicle.

The fan 10 (or ventilation device) essentially comprises, as illustrated, a fan wheel 12, an electric motor 14, and a support 16 for the electric motor 14. The fan wheel 12 rotates around a axis of rotation A. The electric motor 14 is intended to drive in rotation around its axis A, the fan wheel 12. The support 16 of the motor 14 is intended to allow the fixing of the fan device 10 in a motor vehicle, in limiting the transmission of vibrations generated by the electric motor 14 and / or the fan wheel 12 in the motor vehicle and / or external constraints to the electric motor 14 and / or the fan wheel 12. The support 16 of the motor 14 can in particular comprising two coaxial rings, with an axis the axis A of rotation of the fan wheel 12, interconnected by an elastomeric material. In particular, the elastomeric material can form a decoupling ring between the inner ring and the outer ring. The inner ring may be intended to be fixed to the engine 14. The outer ring may be intended to be fixed to a structural element, in particular of a vehicle ventilation installation. The elastomeric material is, for example, polystyrene-b-poly (ethylene-butylene) -b-polystyrene or SEBS.

The electric motor 14 here forms a mechanical assembly comprising a rotating element 18, in this case the rotor 18 of the motor 14, a support 20 of the rotor 18 and a cover 22, fixed on the support 20 of the rotor 18. Here , the cover 22 is fixed on the support 20 of the rotor 18 by means of screws 24. Of course, other fixing means can be used to fix the cover 22 on the support 20 of the rotor 18.

The rotor 18 is here an external rotor. Thus, the stator 26 associated with the rotor 18 is disposed radially inside the rotor 18. More specifically, the magnets 27 of the rotor 18 are radially outward with respect to the winding of the stator 26.

The rotor 18 has the shape of a perforated cup 28, fixed to a shaft 30. The fan wheel 12 is here fixed directly to the shaft 30. The magnets 27 of the rotor 18 are here fixed to the internal face of the cup 28, on a cylindrical strip 32 formed by cup 28.

The support 20 is for example made of an aluminum alloy or a plastic material loaded with metal particles.

The support 20 of the rotor 18 here has a base 34. The base 34 here extends generally in a plane normal to the axis A of rotation of the motor 14. A substantially cylindrical relief 36 extends from the base 34. Here, the relief 36 extends substantially in the direction of the axis A of rotation of the motor 14. The relief 36 is hollow. The relief 36 may in particular form one or two housings 38 each receiving a rolling ring, in particular a ball bearing, intended to guide the rotation of the shaft 30 relative to the support 20.

As is more particularly visible in Figure 5, the base 34 forms on its surface opposite the cylindrical relief 36, a recess 40 receiving a printed circuit board 42 (or electronic card) for controlling the motor 14. The recess 40 may be surrounded by a protruding rim 41. Different mechatronic components 44, 46 are fixed to the printed circuit board 42. In particular, mechanical electrical contact components 44 (in English “leadframe”, sometimes translated into French as “connection grid” or “contact beam”) allow to connect the tabs 45 for contact with the windings of the stator 26, to the printed circuit board 42. The supply of these windings via these tabs 45, can then allow the control of the electric motor 14. The largest electronic components 46 , in particular the capacities, can also be fixed on the printed circuit board 42, preferably in the vicinity of the edges of the printed circuit board 42.

[0058] A connector 48 is also connected to the printed circuit board 42. The connector 48 provides power to the printed circuit board 42 and, therefore, to the motor 14.

Finally, the cover 22 is fixed on the base 34 of the support 20. The cover 22 defines here, with the recess 40 in the base 34, a housing for receiving the printed circuit board 42. The cover 22 here comprises an edge 50, substantially plane, extending in a plane normal to the axis A of rotation of the motor 14. The edge 50 has holes 51 allowing the cover 22 to be attached to the base 34 of the support 20, at the screw means 24. The cover 22 also comprises a bottom 52, distant from the edge 50, in the direction of the axis A of rotation of the motor 14. The bottom 52 is here substantially flat. The bottom 52 extends substantially along a plane, normal to the axis A of rotation of the motor 14. The bottom 52 of the cover 22 is here substantially parallel to the base 34 of the support 20. Here, the bottom 52 of the cover 22 is also substantially parallel to the printed circuit board 42.

The cover 22 is for example made of aluminum alloy or plastic loaded with conductive particles, in particular plastic loaded with metal particles.

It should be noted here that the cover 22 illustrated comprises bosses 54, 56 peripheral. These bosses 54, 56 allow the reception of electronic devices 46, the largest, especially the highest in the direction of the axis A of rotation of the motor 14.

In the example illustrated in Figures 6 and 7, in particular, the cover 22 also has a flat surface 53, closer to the edge 50 than the bottom 52, in the direction of the axis A of rotation of the motor 14 .

Finally, as visible in the figures, the cover 22 and the printed circuit board 42 may each have a through opening 60, 62 facing the shaft 30 of the rotor 18. These openings 60, 62 can allow passage a counter-bearing for the shaft 30, allowing the wheel 12 to be fitted onto the shaft 30. The opening 60 in the cover can then be closed, in particular by means of a sticker. This makes it possible to protect the printed circuit board 42 against humidity in the ambient air.

In the following, we describe in more detail the mechanical components of electrical contact 44 and their attachment to the printed circuit board 42, with reference to Figures 8 to 11.

As illustrated in Figures 8 to 11, a mechanical electrical contact component 44 comprises a first tab 64 with a first portion 64i intended to be fixed flat on the electronic card 42 and a second tab 66 with a first portion 661 intended to be fixed to the contact blade 45. The first portion 64i of the first tab 64 can in particular be fixed to the electronic card 42 by a so-called surface mounting method (so-called TMS method, standing for “Surface Mount Technology”. ”Or SMT). The first portion 64i of the first tab 64 is intended to be in contact with a conductive track of the electronic card 42 to ensure electrical contact between the electronic card 42 and the mechanical electrical contact component 44.

The first portions 64i, 661 of the first and second tabs 64, 66 extending in two separate planes P1, P2. In this case, the two planes P1, P2, are inclined with respect to each other. The angle a between the two planes P1, P2 is for example greater than 90 °, in order to facilitate the contacting of the first portion 661 of the second tongue 66 with the contact blade 45, during the assembly of the motor 14 The angle a between the two planes P1, P2 is preferably greater than or equal to 100 ° and less than or equal to 120 °.

The first portion 661 of the second tongue 66 here comprises a boss 78. The boss 78 is here oriented towards the face 66A of the second tongue 66 which is not oriented towards the first tongue 64. The boss 78 is thus oriented towards the contact blade 45 during the step of attaching the contact blade 45 to the mechanical electrical contact component. This facilitates the contacting of the second tab 66 with the contact blade 45 during the manufacture of the motor 14.

The mechanical electrical contact component 44 further comprises, between the first tab 64 and the second tab 66, a third tab 68. The third tab 68 is elastic. The elasticity of the third tongue 68 makes it possible to limit the forces exerted on the first portion 64i of the first tongue 64, fixed to the electric board 42, at the time of welding with the contact blade 45. In other words, the third tongue 68 makes it possible to limit the transmission of the forces exerted on the second tongue 66, towards the first tongue 64.

[0069] Here, to obtain the elasticity of the third tab 68, the latter is curved. To limit the amount of material needed to form the third tab 68, the latter is curved to form a "U" (or bend). Alternatively, the third tab 68 can be bent several times, in order to be folded in a "Z" or even accordion-style, again in order to ensure the elasticity of the third tab 68.

[0070] According to the example illustrated, the first portion 64i of the first tongue 64 is here trapezoidal. As will be explained in more detail later, this shape of the tongue 64 here makes it possible to optimize the section available for the passage of current in the first frame 70 relative to the bulk of the mechanical electrical contact component 44.

Here, the mechanical electrical contact component 44 furthermore comprises a first frame 70. The first tongue 64 is connected to the first frame 70. The first frame 70 extends around the first tongue 64. More precisely, a second portion 642 of the first tongue 64 connects the first portion 64i of the first tongue 64 to the first frame 70. The second portion 642 of the first tongue 64 is curved in "S", such that the first plane P1, according to which s 'extends the first portion 64i of the first tongue 64, is parallel to a third plane P3, along which the first frame 70 extends.

The first frame 70 has for example a width L70 greater than or equal to 12.5 mm. This value of 12.5 mm is determined because a substantially constant current flow section is desired, in particular between the first tab 64 and the two sides of the first frame 70, so that the width L70 corresponds to at least four times the thickness E70 of the first frame (the first tongue 64 has a width equal to twice the thickness E70, and a branch of the frame extends on each side of the tongue 64). However, each side of the first frame 70 may have a thickness E70, measured in the plane extension P3 of the first frame 70, greater than or equal to 2.7 mm. In addition, two cutouts are made to form the first tab 64 inside the first frame 70. In order to optimize the life of the cutting tool, the width of these cutouts is advantageously greater than or equal to 0, 8 mm.

The current flow section in the frame 70 is thus such that it makes it possible to obtain a limited current density in the frame, in particular less than 9 A / mm ² . The heating of the mechanical electrical contact component 44 by the Joule effect is thus limited or even avoided.

The first frame 70 defines a first opening 71 which extends between the frame 70 and the first tongue 64, along at least three sides of the first tongue 64. In other words, the first tongue 64 n 'is in contact with the frame 70 only via the second portion 642 of the first tongue 64. The free end of the first tongue 64 thus defines the first portion 641 of the first tongue 64.

It should be noted here that due to the trapezoidal shape of the first tongue 64, the thickness E70 'of the first frame 70, measured between the opening 71 and a recess delimiting the third tongue, is equal to the thickness E70 of the first frame 70 measured between the opening 71 and a recess delimiting a fixing lug 74 (or between the first tongue 64 and a front end of the first frame 70). This ensures a substantially constant current flow section throughout the first frame 71, between the first tab 64 and the third tab 68.

The mechanical electrical contact component 44 as illustrated further comprises a second frame 72. The second tongue 66 is connected to the second frame 72. The second frame 72 extends around the second tongue 66. The second frame 72 is here coplanar with the second tongue 66, in particular with the first portion 661 of the second tongue 66. The second frame 72 defines a second opening 73 extending between the second tongue 66 and the second frame 72. The second opening 72 s' extends at least along three sides of second tongue 66. In other words, second tongue 66 only contacts second frame 72 via a second portion 662 of second tongue 66 The width of the second portion 662 of the second tongue 66 is here less than the width of the first portion 661 of the second tongue 66. Here, the second opening 72 has the shape of a horseshoe.

The second frame 72 has for example a width L72 greater than or equal to 15.36 mm. Analogously to the width L70 of the first frame 70, the value of 15.36 mm is determined because a substantially constant current flow section is desired, in particular between the first frame 70 and the second frame 72, so that the width L72 corresponds to at least twice the thickness E72 of the second frame, itself equal to the thickness E70 of the first frame 70. However, each side of the second frame 72 may have a thickness E72, measured in the plane P2 extension of the second frame 72, greater than or equal to 2.7 mm for the same reasons as for the first frame 70. In addition, two recesses are made between the second frame 72 and the second tongue 66. However, as indicated previously, to optimize the life of the tool used, each recess preferably has a width greater than or equal to 0.8 mm. Also, the width of the second tongue 66 is at least equal to the width of the contact blade 45 with which the mechanical electrical contact component 44 is brought into contact. This contact blade 45 here has a width of 8 mm. Finally, a safety margin of 0.36 mm is chosen, aimed at compensating for a possible defect in the positioning of the contact blade 45 relative to the mechanical electrical contact component 44.

As can be seen in Figures 8 to 11 in particular, the third tab 68 here connects the first and second frames 70, 72 together. In the example illustrated, the width L68 of the third tongue 68 is less than the width L70 of the first frame 70 and the width L72 of the second frame 72. However, the third tongue 68 may have a width L68 greater than or equal to twice. of the thickness E70 on one side of the first frame 70 and / or twice the thickness E72 on one side of the second frame 72. Thus, the variations in current density in the mechanical electrical contact component 44 are limited. .

The mechanical electrical contact component 44 further comprises, according to the example illustrated, tabs 74 for fixing to the electronic card 42. Here, the fixing tabs 74 are four in number. The brackets 74 extend along a direction D normal to the extension plane P3 of the first frame 70 and / or to the extension plane P1 of the first portion 64i of the first tongue 64. The fixing lugs 74 are intended to be received in complementary holes, in the electronic card 42. The fixing lugs 74 thus make it possible to increase the mechanical strength of the mechanical electrical contact component 44 and of its fixing on the electronic card 42, in particular at the level of the first portion 64i of the first tab 64, at the level of the first portion 64i of the first tongue 64. during the step of fixing the contact blade 45 on the mechanical electrical contact component 44. It will in fact be recalled that during this step, a relatively high transverse stress is applied to the mechanical electrical contact component 44. It should be noted that the fixing lugs 44 are not intended here to ensure electrical contact between the mechanical electrical contact component 44 and the electronic card 42, in particular with a track co nductrice engraved on the electronic card 42. Thus, it is not necessary for the fixing lugs 44 to be covered with tin on all their faces.

In order to facilitate the fixing of the fixing lugs 44 on the electronic card 42, the free end of each fixing lug 44 may have an extra thickness 75. This extra thickness 75 can be produced by drilling a hole 76 passing through the lug. fixing 44, in the vicinity of the free end of the fixing lug 44. This way of proceeding also makes it possible to ensure that the extra thickness 75 in the vicinity of the free end of the fixing lug 44 is deformable, in particular elastically, and to allow, by the same, the insertion of the fixing lug 44 in a corresponding hole, made in the electronic card 42. The fixing lugs 44 can thus be clipped onto the electronic card 42. The fixing by clipping can, if necessary, be completed by fixing by welding.

[0081] The brackets 74 extend here from the first frame 70.

The two fixing lugs 74 closest to the second frame 72, here form a shoulder, defining a surface 80 intended to be in contact with the electronic card 42, when the first portion 64i of the first tab 64 rests on the electronic card 42. The stability of the mechanical electrical contact component 44 on the electronic card 42 is thus increased. To further increase this stability, the mechanical electrical contact component 44 is shaped so that, when the first portion 64i of the first tongue 64 is disposed horizontally, the center of gravity G of the mechanical electrical contact component 44 is disposed horizontally between the vertical straight lines D each passing through one end of a respective fixing lug 74, as can be seen in particular in FIG. 10.

Thus, due to the great stability of the mechanical electrical contact component 44, it is possible, as can be seen in FIG. 12, to stack several mechanical electrical contact components 44, one on top of the other, in order to form an assembly 82. Here, all the mechanical electrical contact components 44 of the assembly 82 are identical. Such an assembly 82 makes it possible to store mechanical electrical contact components 44 in a restricted space, in particular in a tube. This also allows easy handling of the mechanical electrical contact components 44 of the assembly 82, for example on an assembly line, even by a PLC.

As can be seen in Figure 12, in assembly 82, each mechanical electrical contact component 44 rests by its tabs 74 on the first frame 70 of the mechanical electrical contact component 44 located below. Further, the boss 78 on the second tab 66 of each mechanical electrical contact component 44 is in contact with the second tab 66 of the mechanical electrical contact component located below. In particular, the second frame 72 of each mechanical electrical contact component 44 may be in contact with the second frame 72 of the mechanical electrical contact component 44 located below in the absence of a boss 78 or in the case where the second frame 72 of the mechanical electrical contact component 44 located below has a hollow indentation complementary to the boss 78.

A mechanical electrical contact component 44 as described above can in particular be produced by implementing a manufacturing process 100 according to the flowchart of Figure 13.

This method 100 comprises an initial step 102 consisting in providing a metal plate 84. The metal plate is preferably covered with tin. In Thus, it is not necessary to cover the mechanical electrical contact component 44 with tin, at the end of the manufacturing process.

The method 100 then continues with a second step 104 consisting in producing at least one blank 86 of mechanical electrical contact component 44 in the metal plate 84. As illustrated in FIG. 14, several blanks 86 are preferably produced. The blanks 86 can all be identical. Here, in order to limit off-cuts, blanks 86 heads are made. During this second step 104, the production of the blanks 86 consist in making cutouts 88 in the metal plate corresponding to the final shape of the mechanical electrical contact components 44. Cutouts 90 can also be made in this second stage 104, in order to separate the different blanks 86.

It should be noted that in Figure 14, a single row of blanks 86 is produced on the metal plate 84. However, those skilled in the art easily understand that it is also possible to produce several rows of such blanks. on a metal plate 84, in order to quickly obtain a larger number of blanks 86.

The method 100 continues here with a third step 106 consisting in making the openings 76 and the corresponding thicknesses 75, in the vicinity of the ends of the tabs 74. This step is more easily carried out before the bending of the blanks 86. The result is thus obtained a blank 86 as illustrated in FIG. 15.

Alternatively, the openings 76 and the extra thicknesses 75 are produced by cutting, during the same step 104 during which the other cuts of the blanks 86 are made.

The boss 78, not illustrated in FIG. 15, can also be produced during the third step 106.

The method 100 then continues with a last step 108 consisting in making the necessary bends of the blank 86 in order to obtain a mechanical component of electrical contact. Here, advantageously, all the axes around which folds are made, illustrated by dotted lines in Figure 15, are parallel.

As indicated above, the method 100 is preferably devoid of a final step consisting in tinning the mechanical electrical contact component 44 obtained in the last step 108.

In the following, we describe variants of the mechanical electrical contact component 44 illustrated in Figures 8 to 11, with reference to Figures 16 to 32. The variants illustrated in these Figures 16 to 32 all have in common that they do not have first frame 70 around first tongue 64 and second frame 72 around second tongue 66. These mechanical electrical contact components 44 are thus easier to put in place relative to tabs 45 for contact with the stator windings.

Figures 16 to 18 illustrate a first variant of mechanical component of electrical contact 44.

According to this first variant of mechanical electrical contact component 44, the second portion 642 of the first tongue 64 is curved at right angles. The first tongue 64 thus comprises a third portion 643, adjacent to the second portion 642, extending perpendicularly to the first portion 64i of the first tongue 64. Thus, this third portion 643 of the first tongue 64 extends substantially parallel to the second tongue 66, in particular to the first portion 661 of the second tongue 66.

Furthermore, the second portion 662 of the second tongue 66 is here less wide than the first portion 661 of the second tongue 66.

The third tongue 68 comprises a first portion 681 forming an elbow, adjacent to the second tongue 66, in particular to the second portion 662 of the second tongue 66. The first portion 681 of the third tongue 68 is less wide than the first portion 661 of the second tongue 66 and, here, substantially of the same width as the second portion 662 of the second tongue 66. The first portion 681 of the third tongue 68 is of constant width. As can be seen in particular in FIG. 18, the bend formed by the first portion 681 of the third tongue 68 extends over an angular sector a greater than or equal to 120 ° and / or less than 180 °. Here, by way of example, the angular sector a is substantially equal to 175 °.

[0101] In addition, the radius of curvature R of the bend formed by the first portion 681 of the third tab 68 is greater than or equal to 1.5 times the thickness e of the third tab 68 at this bend. This ensures the flexibility of the third tab 68, at least at the elbow. Furthermore, here the thickness e is substantially constant throughout the mechanical electrical contact component 44.

The first portion 681 of the third tongue 68 is connected to a second portion 682 parallel to the first portion 64i of the first tongue 64. The angle formed at the junction between the first and second portions 681, 682 of the third tongue 68 does not allow bending here, preferably between these two portions 681, 682. The second portion 682 is substantially planar. The second portion 682 of the third tongue 68 extends opposite (or opposite) the first portion 64i of the first tongue. The second portion 682 of the third tongue 68 is here of an area smaller than that of the first portion 64i of the first tongue 64. At its end opposite to the first portion 681 of the third tongue 68, the second portion 682 of the third tongue 68 widens, presenting here a trapezoidal part.

The second portion 682 of the third tongue 68 is connected to the second portion 642 of the first tongue 64, by a third portion 683 here forming a right angle. Here, the radius of curvature of this third portion 683 of the third tongue 68 is preferably chosen in order to limit or even prevent bending of this third portion 683 of the third tongue 68.

[0104] The mechanical electrical contact component 44 illustrated in Figures 16 to 18 further comprises two fixing tabs 74. The tabs 74 extend here substantially parallel to the third portion 643 of the first tab 64. Each tab 74 has a lug forming a hook at their free end. Thus, the tabs 74 allow a temporary placement of the mechanical component of electrical contact 44 on the printed circuit board, prior to fixing by an SMT process. The tabs 74 can in particular clamp the printed circuit board.

The analyzes carried out show that this first variant of the mechanical electrical contact component 44 exhibits good flexibility of the second tongue 66, in particular of the first portion 661 of the second tongue 66, relative to the first tongue 64, in particular by compared to the first portion 641 of the first tongue 64. This first variant of the mechanical electrical contact component 44 also has very good resistance to mechanical stresses and a modest manufacturing price. This first variant can finally be carried out easily with the methods conventionally implemented by a person skilled in the art.

Figures 19 and 20 illustrate a second variant of mechanical component of electrical contact 44.

[0107] According to this second variant, the bend formed by the first portion 681 of the third tongue 68 extends over a smaller angular sector than in the case of the first variant. Here, this angular sector can be substantially 100 °. However, the radius of curvature of this first portion 681 is greater than 1.5 times the thickness of the first portion 681 of the third tongue 68 to ensure the flexibility of the elbow thus formed.

[0108] Furthermore, the second portion 682 of the third tongue 68 is wider than the first portion 681 of the third tongue 68. For example, the second portion 682 of the third tongue 68 is substantially of the same width as the first portion 64i of the first tab 64.

According to this variant, the second portion 682 is separated from the third portion 683 by a fourth portion 684, extending substantially perpendicularly to the first portion 64i of the first tongue 64. This fourth portion 684 is connected to the second portion 682 by a fifth portion 685 cubit. Here, this fifth portion 685 is bent so as to limit or even prevent the bending of the second and fourth portions 682, 684, with respect to one another. Here, the second and fourth portions 682, 684 are substantially of same width. The second and fourth portions 682, 684 are also wider than the fifth portion 685.

[0110] The third portion 683 of the third tongue 68 is here curved to form a "U" connecting the fourth portion 684 of the third tongue 68 and the third portion 643 of the first tongue 64. Here, the third portion 683 of the third tongue 68 is also shaped to limit or even prevent bending of the fourth portion 684 of the third tongue 68 relative to the third portion 643 of the first tongue 64.

The third portion 643 of the first tongue 64 is here of the same width as the fourth portion 684 of the third tongue 68. The third portion 643 of the first tongue 64 and the fourth portion 684 of the third tongue 68 are furthermore here wider than the third portion 683 of the third tab 68.

Likewise, here, the third portion 643 of the first tongue 64 is of the same width as the first portion 64i of the first tongue 64. The first portion 64i of the first tongue 64 and the third portion 643 of the first tongue 64 are also wider than the second portion 642 of the first tab 64.

The analyzes carried out show that this second variant has less flexibility than that of the first variant.

Figures 21 and 22 illustrate a third variant of mechanical component of electrical contact 44.

[0115] This third variant differs from the first variant, firstly by the fact that the first portion 681 of the third tab 68 is bent on a smaller angular sector. Here, the angular sector is for example greater than 90 and / or less than 120 °.

[0116] In addition, the second portion 682 of the third tab 68 is wider than the first portion 681 of the third tab 68.

Finally, the third portion 683 of the third tongue 68 is narrower than the second portion 682 of the third tongue 68 and, here, than the third portion 643 of the first tongue 64. This third variant also has less flexibility than the first variant of a mechanical component for electrical contact.

Figures 23 and 24 illustrate a fourth variant of mechanical component of electrical contact 44.

This fourth variant corresponds substantially to the second variant, in which the third tongue 68 is of constant width (therefore the different portions of this third tongue 68 all have the same width). The width of the third tongue 68 is here less than the width of the first portion 661 of the second tongue 66.

[0121] In addition, the third portion 643 of the first tongue 64 is of width equal to the width of the third tongue 68, at least in the vicinity of this third tongue 68.

[0122] With this configuration, the third portion 683 of the third tab 68 can be flexible.

This fourth variant has greater flexibility than the second and third variants, but a little less than that of the first variant.

[0124] FIGS. 25 and 26 illustrate a fifth variant of a mechanical component for electrical contact 44.

This fifth variant corresponds to the fourth variant, in which the third tongue 68 is of the same width as the second tongue 66. The third portion 643 of the first tongue 64 is also of the same width as the third tongue 68. The second portion 642 of the first tongue 64 is of width less than the first portion 64i of the first tongue 64 and the third portion 643 of the first tongue 64.

This fifth variant has a flexibility comparable to that of the fourth variant.

[0127] FIG. 27 illustrates a sixth variant of a mechanical component for electrical contact 44. This sixth variant corresponds to the second variant, in which the fourth portion 684 of the third tongue 68 is of the same width as the third and fifth portions 683, 685 of the third tongue 68.

[0129] This configuration also makes it possible to obtain a flexibility comparable to that of the fourth variant.

[0130] FIG. 28 illustrates a seventh variant of a mechanical component for electrical contact 44.

This seventh variant corresponds to the fourth variant, in which the third portion 683 of the third tab 68 is wider than the rest of the third tab 68.

[0132] This configuration also makes it possible to obtain a flexibility comparable to that of the first variant.

[0133] FIGS. 29 and 30 illustrate an eighth variant of a mechanical component for electrical contact 44.

This eighth variant corresponds to the seventh variant, in which:

- the second tongue 66 and the first, third, fourth and fifth portions 681, 683, 684, 685 of the third tongue 68 are of the same width;

- the second portion 682 of the third tongue 68 and the third portion 643 of the first tongue 64 are of a width smaller than the second tongue 66;

- the bend formed by the first portion 681 of the third tongue 68 extends over an angular sector greater than or equal to 120 ° and / or less than 180 °; and

- the bend formed by the first portion 685 of the third tongue 68, between the second and fourth portions 682, 684, extends over an angular sector greater than or equal to 120 ° and / or less than 180 °. This elbow is however preferably shaped so as not to be flexible.

[0135] This configuration makes it possible to obtain an intermediate flexibility between that of the second variant and that of the fourth, fifth and sixth variants.

Finally, FIGS. 31 and 32 illustrate a ninth variant of a mechanical component for electrical contact 44. According to this ninth variant, the first and fifth portions 681, 685 of the third tab 68 are connected by a portion 68e forming a second bend. This second elbow is here substantially identical to the first elbow. This second bend is particularly flexible. The two bends of the third tab 68 thus form two undulations between the first and second tabs 64, 66.

Here, the portion 68e of the third tongue 68 is of the same width as the first, fourth and fifth portions 681, 684, 685 of the third tongue 68. This width is here less than the width of the third portion 683 of the third tab 68. [0139] This ninth variant has even greater flexibility than that of the first variant.

[0140] The invention is not limited to the embodiments described with reference to the figures and other embodiments will become clear to those skilled in the art. In particular, the different examples can be combined, as long as they are not contradictory.

[0141] In particular, the mechanical electrical contact component may not have a fixing lug. In this case, the mechanical electrical contact component may only be in contact with the electronic card through the first portion of the first tab. This first portion of the first tab then provides mechanical contact and electrical contact with the printed circuit board.

Claims

[Claim 1] Mechanical electrical contact component (44), intended to be fixed on an electronic card (42), in order to bring a printed circuit on the electronic card (42) into electrical contact with an electrical contact blade (45) , in particular an electrical contact blade (45) with a stator winding of an electric motor (14) of a fan (10) of a heating, ventilation and / or air conditioning installation of a motor vehicle, the mechanical component electrical contact (44) comprising a first tab (64) with a first portion (64i) intended to be fixed flat on the electronic card (42), a second tab (66) with a first portion (661) intended to be fixed to the electrical contact blade (45), the first portions (64i; 661) of the first and second tabs (64; 66) extending in two distinct planes (P1; P2), in particular two planes (P1; P2) inclined with respect to each other, and, between the first tab (64) and the second tongue (66), a third resilient tongue (68), the third tongue (68) preferably being curved.

[Claim 2] A mechanical electrical contact component according to claim 1, further comprising at least one tab (74) for attachment to the electronic card (42), preferably a plurality of attachment tabs (74), extending along a direction (D) substantially normal to the first portion (64i) of the first tongue (64).

[Claim 3] A mechanical electrical contact component according to claim 1 or 2, wherein the first tab (64) is connected to a first frame (70) extending around the first tab (64), the first frame (70). ) being substantially parallel to the first portion (64i) of the first tongue (64), the first tongue (64) preferably comprising a second portion (642), folded, in particular in an "S", connecting the first frame (70) to the first portion (64i) of the first tab (64).

[Claim 4] A mechanical electrical contact component according to claim 3, wherein an opening (71) extends between the first tab (64) and the first frame (70), at least on three sides of the first tab (64). ).

[Claim 5] A mechanical electrical contact component according to any preceding claim, wherein the second tongue (66) is connected to a second frame (72) extending around the second tongue (66), the second frame (72) being coplanar with the second tongue (66), in particular with the first portion (661) of the second tongue (66), an opening (73) preferably extending between the second tongue (66) and the second frame (72), at least on three sides of the second tab (66).

[Claim 6] A mechanical electrical contact component according to claims 4 and 5, wherein the third tab (68) connects the first frame (70) and the second frame (72).

[Claim 7] A mechanical electrical contact component according to any preceding claim, wherein the first and second tabs (64; 66), respectively the first and second frames (70; 72), where appropriate, form an angle greater than or equal to 100 ° and less than or equal to 120 °.

[Claim 8] A mechanical electrical contact component according to any preceding claim, wherein the first tab (64) has a portion (643) extending substantially perpendicular to the first portion (64i) of the first tab (64). ).

[Claim 9] A mechanical electrical contact component according to any preceding claim, wherein the third tab (68) has a first portion (682), parallel to the first portion (64i) of the first tab (64), the first portion (682) of the third tongue (68) being at least partly opposite the first portion (64i) of the first tongue (64).

[Claim 10] A mechanical electrical contact component according to claims 8 and 9, wherein the third tab (68) has a second "U" shaped portion (683) between said one portion (643) of the first tab (64) and the first portion (682) of the third tab (68).

[Claim 11] A mechanical electrical contact component according to claim 9, wherein the third tab (68) has a "U" shaped portion (681) connecting the first portion (682) of the third tab (68) to the second tongue (66), in particular to the first portion (661) of the second tongue (66).

[Claim 12] A mechanical electrical contact component according to claim 11, wherein the width of the "U" portion (681) of the third tab (68) is substantially equal to the width of the first portion (682) of the third tab (68), the width of the first portion (682) of the third tab (68) preferably being less than the width of the first portion (64i) of the first tab (64).

[Claim 13] A mechanical electrical contact component according to claim 8, wherein the third tab (68) forms at least one corrugation, preferably two corrugations, connecting said one portion (642; 643) of the second tab (64) to the second tongue (66), in particular to the first portion (661) of the second tongue (66), the part of the third tongue (68) forming corrugation / s being preferably still of a width less than the width of the first portion (64i) of the first tongue (64) and / or the width of the first portion (661) of the second tongue (66).

[Claim 14] A mechanical electrical contact component according to any one of the preceding claims, wherein the third tab (68) comprises at least one bend (681; 68e; 685) whose radius of curvature (R) is greater than or equal. to 1.5 times the thickness (e) of the third tab (68).

[Claim 15] An assembly (82) of mechanical electrical contact components (44), comprising a plurality of mechanical electrical contact components (44), all according to any preceding claim, wherein the mechanical electrical contact components ( 44) are stacked, the mechanical electrical contact components (44) preferably all being identical.

[Claim 16] An assembly of a printed circuit board (42) and at least one mechanical electrical contact component (44) according to any one of claims 1 to 14, fixed to the printed circuit board (42) such that the first portion (64i) of the first tab (64) is secured to the circuit board printed circuit board (42), in contact with a track of the printed circuit, by implementing a surface mounting technique.

[Claim 17] Fan (10) for a motor vehicle heating, ventilation and / or air conditioning installation, comprising a rotor (18), a stator (26) with at least one stator winding, an assembly of a printed circuit board (42) and at least one mechanical electrical contact component (44), according to claim 16, and at least one electrical contact blade (45) in electrical contact with the at least one stator winding, on the one hand, and with the first portion (661) of the second tab (66) of the mechanical electrical contact component (44), on the other hand.