FR2811144A1 - ELECTRICAL LINK MODULE OF ROTATING ELECTRICAL EQUIPMENT WITH IMPROVED MECHANICAL RESISTANCE - Google Patents

Abstract

The invention relates to an electrical connection module for a rotating electrical machine, comprising an electronic circuit (200), a support 210) for this electronic circuit, as well as a connecting finger (100) electrically connected to the circuit (200), characterized in that it comprises a complementary assembly (300, 400) separate from the support (210) and from the finger 100), which forms both a mechanical holding assembly for the finger (100) and an electrical connection between the finger (100) and the circuit (200).

Description

The present invention relates to equipment connection modules

  rotating electrics, including alternators or alternators

  motor vehicle starters.

  The invention thus also relates to such rotating equipment in marine vehicles. It also concerns any type of machine

rotating electric.

  Such connection modules are known, usually called "power output integrated into a connector" or "connector of

power ".

  Current connection modules include a connection terminal made of material with a solid piece of the equipment concerned, for example material made with the radiator in the case of an alternator. However, current connection modules must include integrated circuits and connection terminals from a solid part

  prove difficult to connect to such circuits.

  Current developments therefore prove to be hardly compatible with

  circuits including a substrate and bare chips.

  The invention proposes to resolve this drawback, that is to say to provide a connection module for rotating electrical equipment which

  easily integrates an electronic circuit, in particular an integrated circuit.

  This object is achieved according to the invention thanks to an electrical connection module of a rotating electrical machine, comprising an electronic circuit, a support for this electronic circuit, as well as a connection finger electrically connected to the circuit, characterized in that it includes a separate complementary assembly of the support and the finger, which forms both a mechanical support assembly for the finger and connection

  between the finger and the circuit.

  According to other advantageous and non-limiting arrangements: - the finger includes a part with a non-circular periphery and in that said complementary assembly comprises means for enclosing this part with a non-circular periphery; - The complementary assembly includes a metal blade placed against the finger and a plastic part, cast on the blade and the finger, the plastic part leaving part of the finger exposed; - The means for enclosing the non-circular periphery part include the plastic part; - The plastic means which enclose the non-cylindrical part of the finger are cast on this part; - The complementary assembly includes a conductive strip provided with a through hole, the finger has an external shoulder, and the finger passes through the hole, pressing by its shoulder against the edges of the hole; the means for enclosing the part with a non-circular periphery include a metal blade provided with a through orifice in which the finger is placed, the blade having at least one fold at the edge of the hole which comes to bear against the part with non-circular periphery on point; - The blade has two sides folded back on themselves and has an orifice passing through these two sides, in which the finger is placed; - The plastic part extends around the blade, leaving uncovered an outer surface of one of the two folds of the blade opposite a part of the finger which projects from the complementary assembly; the blade forms four branches, three of which extend away from a central part of the blade, and one is folded against a central zone of the blade, the folded branch and the central zone of the blade being crossed by the finger, two blades away from each other having a part folded back against a non-circular peripheral portion of the finger, as well as a part extending beyond this fold away from the central zone, the plastic material poured leaving the third so-called branch uncovered distance from the blade; The complementary assembly includes a blade provided with an orifice in which the finger is placed, and the finger is fixed to the blade by a riveting ring surrounding the finger; - The finger is intended to constitute a terminal among the positive, negative or phase terminals of a motor vehicle alternator; - the motor vehicle alternator includes an electrical connection module; - the motor vehicle alternator-starter includes a

electrical connection.

  Other characteristics, aims and advantages of the invention

  will appear on reading the detailed description which follows, made in

  reference to the appended figures in which: - Figure 1 shows a first variant of a connection module according to the invention, with wiring between a connection finger and a circuit of the module; - Figure 2 shows a second variant of a connection module according to the invention, with a connection bridge between a connection finger and a circuit of the module; - Figure 3 shows a third variant in which an electrical connection between a connection finger and a module circuit is made by a lower face of a complementary assembly according to the invention; - Figure 4 shows, in bottom view, a channel formed in the complementary assembly of Figure 3; - Figure 5 shows a fourth variant of the invention in which a connection finger is provided with a circumferential spacer; - Figures 6 and 7 show a fifth variant of the invention, with a bent metal blade and riveted finger; - Figure 8 shows a sixth variant of the invention, in which a conductive strip has a folding with anti-rotation effect, according to the invention; - Figure 9 shows the same assembly after a plastic molding step, in vertical section; - Figure 10 shows a seventh variant of the invention in which a conductive strip is folded to produce an anti-rotation effect

  is also embedded in a plastic material over its entire length.

  The present connection modules mainly include an electrically conductive finger 100 intended to be engaged with a complementary connector, an electronic circuit 200 and a complementary assembly 300 whose role is to mechanically hold the finger 100 outwards and to connect it electrically to the circuit. 200. The finger used here is for example a power finger corresponding to the known reference M5 or M8, but can also be constituted by a

standard screw.

  The circuit 200 consists of a support 210, here a substrate, on

  which integrate the electronic components 220.

  The module also includes a metal blade 400 (or trace 400)

  provided with a through hole 410 in which the finger 100 is housed.

  The connection module further comprises the complementary assembly 300 which is a block of plastic material 300 which surrounds

  partially finger 100 and blade 400.

  The plastic material is advantageously a PPS or a PBT.

  In the variants of FIGS. 1 to 4, the finger 100 is here a simple screw having a non-cylindrical head 110, here hexagonal or for example square, whose threaded rod emerges from the plastic block 300, and whose head 110, in abutment against the edges of the orifice 410 of the blade 400, is embedded with

  this blade in the plastic block 300.

  The plastic block 300 therefore matches the screw head 110, and maintains it,

  in particular against any rotation of the finger 100 around its axis.

  In the embodiments of Figures 1, 2 and 5, the blade 400 extends transversely to the finger 100 until it protrudes from the block 300 on one of its sides by a free end. This free end forms a contact surface to which is connected an electrical connection element which

extends to card 200.

  In FIG. 1, this connection is a metallic wire welded for example by ultrasound or any other method both on the slide and on the substrate 210

  (It is also possible to have several wires).

  In FIG. 2, the connecting element is a rigid bridge which is brazed, glued or electrically welded to the blade 400. According to a variant, the blade 400 is extended by an elastic tongue which is supported on the

  substrate (the substrate can also be called "trace").

  The blade 400 is preferably treated on the surface to allow ultrasonic wiring, soldering or electrical welding or any other means of attachment and connection with the substrate. In the embodiment of FIGS. 3 and 4, the plastic block 300 and the blade 400 both extend in lateral distance from the finger 100. The block 300 and the blade 400 thus form an elongated parallelepiped transverse to the finger 100. The elongated parallelepiped extends

  in particular next to finger 100, forming a lateral appendage to finger 100.

  This appendage is crossed by a channel 320 parallel to the finger 100.

  The channel 320 opens on two opposite faces of the block 300, that is to say on the face of the block of which protrudes the finger 100, and on the opposite face

  (hereinafter called the underside of the block).

  The blade 400 covers said appendage formed by the block 300 on its underside. For this, the blade 400 describes, from the head 110 of the screw, a first fold parallel to the finger 100 until it reaches the underside of the plastic block, then a second fold at 900 to extend the

  along the underside of the appendix.

  In vertical section, that is to say in section parallel to the axis of the finger, the blade 400 therefore forms a stair step whose upper level is crossed by the finger 100 and whose lower level covers

  partially the underside of the plastic appendage.

  The blade 400 has, on this lower face, a second orifice 420 of diameter slightly greater than that of the channel 320, which borders

  the lower mouth of this channel 320.

  The internal plastic walls of the channel 320 thus extend into the orifice 420 of the blade, forming an insert over the thickness of the blade 400.

insulating plastic.

  The blade 400 thus forms a lower contact surface of the block

  against which the upper contacts of the circuit 200 are positioned.

  The substrate plate 210 is fixed against the blade 400 by screwing in

  through channel 320 and a through hole of the substrate.

  In these different embodiments, the finger 100 is mechanically held by the plastic block 300, which does not transmit any mechanical force to the substrate 210. In particular, the maintenance of the terminal 100 against a rotational force is supported by the block 300 , without stress on the substrate. The finger or terminal 100, which here consists of a standard screw, can also have a rod without a screw. The complementary connector is then typically a lug, a socket or another

  plug-in connection element.

  In the embodiment of FIG. 5, the finger 100 is surrounded by a tubular spacer 500 which extends in the plastic block 300 until it comes to bear against the blade 400. The spacer also extends

  outside the block, around a portion of the stem of finger 100.

  The spacer 500 here slid on the finger, can also be screwed on it. The spacer 500 can also be constituted by a socket,

integral with the blade 400.

  Support from the additional terminal can also take place

  via a spacer coming from this terminal itself.

  The present spacer 500 can be put in place before molding so that the plastic comes to mold it or be put in place

  after molding, its housing having been reserved.

  In the case where the spacer 500 is free to slide on the finger 100, a screw connector is engaged at the free end of the finger 100 and comes to press on the spacer to put it in abutment against the blade 400. The blade

  400 is then in turn pressed against the head 110 of the finger 100.

  To carry out the assemblies previously described, the finger 100 is introduced into the blade 400 then the plastic block 300 is

sunk on finger and blade.

  In FIG. 6, the finger 100 also constitutes a rivet passing through the blade 400, this riveting sufficient to hold the finger against a rotation of the latter. The finger 100 can also be fixed on the blade 400 by fitting. In this case, the anti-rotation effect of the finger is achieved by fitting this finger into the blade 400. It can also be

  fitted into the plastic block 300.

  In the variant of FIG. 6, the blade 400 is folded back on itself

  and the finger crosses these two folds simultaneously.

  In addition, the plastic block 300 here marries the blade 400 without coming into contact with the finger 100. For this, the blade 400 is embedded in the plastic with a cylindrical reservation not shown here, which is placed in the extension of the orifice 410 of the blade before pouring the plastic, then removed after the plastic has hardened. We thus obtain a

  reservation 340 with a diameter slightly greater than that of the orifice.

  The finger 100 is then placed in this reservation 340, separated from the internal walls of this reservation forming a channel by a space. The finger 100 which also forms a rivet, is in the form of a rod, the head 110 of which is brought into lower abutment against the blade

400.

  The finger 100 is fitted into the blade 400 from below, it is

  say introduced into this blade by the connection end of finger 100.

  The finger 100 is therefore introduced into the orifice 410 by its lower face, and then receives a riveting ring 120 by its free end. This ring 120 then comes to bear on the upper edges of the blade 400. It is also possible to provide a finger 100 which has a

  shoulder turned downward and riveted from below.

  The riveting ring 120 here forms a shoulder facing the free end of the finger 100, a shoulder which protrudes above the block 300. In this embodiment, the finger 100 is chosen in a final mounting step, which allows the assembly of blade 400 and

  of block 300 before having to choose finger 100.

  In the embodiment of FIGS. 8 and 9, the blade 400 has,

  here again, two folds brought together and crossed by finger 100.

  The finger 100 has, again, a head whose upper face

  comes into abutment against one of the folds of the blade.

  In addition, the head of the finger 100 is again a head 110 with a non-cylindrical periphery, here hexagonal. To block this head 110 in rotation, the blade 400 forms two wings folded against the hexagonal head extending from the central zone of the blade 400 which is crossed by the finger, More specifically, the blade 400 has a side view relative to on finger 100, an inverted U-shaped part, the vertical bars of which frame the head of finger 100 in a complementary manner, and the bottom of the U of which is

  crossed by the current part of the finger.

  This blade 400 initially has the shape of a planar cross having a central zone and four branches in the form of planar wings. A first wing is folded over the central zone of the cross to double the thickness of this central zone towards the top of the blade, and thus form

  a reinforced part for receiving the finger 100.

  Among the three remaining branches, two diametrically opposite lateral branches are folded towards one another to form the branches of the U previously described. These two branches, after their part intended to border the head, then extend substantially

radial to finger 100.

  The fourth branch of the blade 400 remains, it, in the extension of the central zone, to form an electrical contact surface. The blade 400 is first shaped, then receives the finger 100. Once the finger is placed, the block 300 is poured over the assembly. The block 300 completely surrounds the two branches which border the head of the blade 400 to

  ensure the anti-rotation maintenance of these branches.

  The block 300 does not cover the entire length of the fourth branch, which is subsequently connected to the circuit 200. The branch forming an upper fold over the center of the blade 400 has its upper face

  discovery towards the free end of finger 100.

  The plastic material of the block 300 comes to that flush with this face

  upper without covering it during pouring.

  The upper fold thus forms a local elevation of the blade, which

  remains uncovered around the periphery of finger 100.

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  This contact surface is capable of receiving a complementary connector engaged on the finger 100. Thus, the electrical contact of this

  connector is made directly on the blade 400.

  As can be seen in FIG. 9, the plastic overmolding also has a reservation 360 opposite the underside of the head 110 of the finger 100, allowing circulation and extraction of the finger 100 in and

out of block 300 after molding.

  In the variant of FIG. 10, the head of the finger 100 is this time molded. The blade 400 has the same U-shaped geometry which frames the head 110 of the finger 100 in a complementary manner. However, the blade does not have such a central fold. Block 300 extends over the area

blade central 400.

  In the variant of FIG. 10, it is therefore no longer necessary to watch over the matting of the plastic, unlike the other overmoldings of the

  head of the finger which are adopted in the case of FIGS. 1 to 5.

  In this embodiment, the finger 100 is provided with a circumferential spacer 500 which borders it in and out of the block 300, this spacer extending from the blade 400 until it projects out of the block 300 with the finger 100. In the variant of FIGS. 8, 9 and 10, provision is also made for retaining arrangements on the finger head, capable of cooperating with complementary arrangements of the blade 400. These arrangements, for example preferably snap-in elements (clips)

  hold the head of the finger during the molding of the plastic.

  These assemblies advantageously provide the interface between the electronic circuit 200 and a network external to the rotating electrical equipment. These assemblies are also suitable for the connection between the electronic circuit 200 and another part of the same rotating equipment. The finger 100 thus forms a terminal which can be a positive, negative terminal or a phase terminal for an alternator, for example in the case

  a separate module from the alternator.

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Claims (14)

  1. Electrical connection module for a rotating electrical machine, comprising an electronic circuit (200), a support (210) for this electronic circuit, as well as a connection finger (100) electrically connected to the circuit (200), characterized in that that it comprises a complementary assembly (30u, 400) distinct from the support (210) and the finger (100), which forms both a mechanical holding assembly for the finger (100) and electrical connection between the finger (100) and the circuit (200).   2. Module according to claim 1, characterized in that the finger (100) includes a part with non-circular periphery (110) and in that said complementary assembly (300, 400) comprises means for clamping   this part with non-circular periphery (110).   3. Module according to any one of the preceding claims,   characterized in that the complementary assembly (300, 400) includes a metal blade (400) placed against the finger (100) and a plastic part (300), cast on the blade (400) and the finger (100) , the part in   plastic material leaving part of the finger (100) uncovered.   4. Module according to claims 2 and 3 in combination,   characterized in that the means for enclosing the non-peripheral part   circular (110) include the plastic part (300).   5. Module according to claim 4, characterized in that the plastic means (300) which enclose the non-cylindrical part (110) of the   finger (100) are poured on this part.   6. Module according to any one of the preceding claims,   characterized in that the complementary assembly (300, 400) includes a conductive strip (400) provided with a through hole (410), the finger (100) has an external shoulder, and the finger passes through the hole (410), in support   by its shoulder against the edges of the hole (410).   7. Module according to claim 2, characterized in that the means for enclosing the non-circular periphery part (110) include a metal strip (400) provided with a through hole (410) in which is placed the 2811 144   finger (100), the blade (400) having at least one fold at the edge of the hole (410) which bears against the non-circular periphery part (110) of the finger (100).   8. Module according to claims 3, 4, 5, 6 or 7, characterized in that   that the blade (400) has two sides folded back on themselves and has an orifice (410) passing through these two sides, in which the finger is placed (100).   9. Module according to claim 8 in combination with claim 3, characterized in that the plastic part (300) extends around the blade (400), leaving uncovered an outer surface of one of the two plies of the blade (400) facing part of the   finger (100) which projects from the complementary assembly (300, 400).   10. Module according to claims 3, 7 and 8 in combination, or   according to claims 3, 7, 8 and 9 in combination, characterized in that   the blade (400) forms four branches, three of which extend away from a central part of the blade (400), and one is folded against a central zone of the blade (400), the folded branch and the central zone of the blade (400) being traversed by the finger (100), two blades moving away having a part folded back against a non-circular peripheral portion (110) of the finger (100), as well as a part extending beyond this fold away from the central area, the plastic material leaving   discovery of the third said branch away from the blade (400).   11. Module according to any one of the preceding claims,   characterized in that the complementary assembly (300, 400) includes a blade (400) provided with an orifice (410) in which the finger (100) is placed, and in that the finger (100) is fixed on the blade by a riveting ring (120) surrounding the finger (100).   12. Module according to any one of the preceding claims,   characterized in that the finger (100) is intended to constitute a terminal among the positive, negative or phase terminals of a motor vehicle alternator.   13. A motor vehicle alternator, characterized in that it includes an electrical connection module according to any one of claims 1   at 12. 14. Motor vehicle alternator-starter, characterized in that it   includes an electrical connection module according to any of claims 1 to 12.