FR3011687A1 - DEVICE FOR ELECTRICAL CONNECTION BETWEEN A CIRCUIT AND TABS OF A POWER SUPPLY OF AN ELECTRIC MOTOR - Google Patents

Abstract

The invention relates to an electrical connection device (1) between a power supply circuit (3) of an electric motor (5), in particular a motor vehicle wiper motor, and tongues (7) for a power supply of said electric motor (5), said device comprising a support (9) and one or more electrical conductors (3) intended to come into contact with said tongues (7), said support (9) comprising one or more fastening elements (35), the one or more fastening elements (35) and the one or more electrical conductors (3) co-operating in form complementarity to enable the said one or more electrical conductors (3) to be held on the said support (9).

Description

The present invention relates to a device for electrical connection between an electric circuit and tongues of a power supply of an electric motor, in particular a motor of a motor. motor vehicle wiper. It may in particular be an electrical connection device for tongues of a wafer holder. There is known an electrical connection device for an electric motor, in particular a wiper motor, comprising electrical conductors or bus bars for the motor power supply. The electrical conductors are positioned by a support plate and a cover between which they are held tight. Such a method of attachment may however be insufficient, in particular with regard to the electrical connection to be established between the electrical conductors and the tabs of the motor carbon plate. The invention aims to overcome this drawback. It is proposed for this purpose a device for electrical connection between a power supply circuit of an electric motor, in particular a wiper motor of a motor vehicle, and tongues of a power supply of said electric motor, said device comprising a support and one or more electrical conductors intended to come into contact with said tongues, said support comprising one or more fastening elements, said one or more fastening elements and said one or more electrical conductors co-operating by complementarity of shapes to allow the maintenance of said one or more electrical conductors on said support. By "cooperating by complementarity of forms", it is understood that the said electrical conductor or conductors are retained on the support by forms cooperating with each other by plugging, latching or equivalent so as to allow a manual or robotic installation, said conductors in a limited number of movements, even in one movement. In this way, precise positioning is obtained without having to resort to complex operations such as welding, bonding and / or overmoulding, and / or requiring inserts such as rivets, screwing or others. According to other features of the invention that may be taken alone or in combination: - said device comprises a protective cap covering the one or more electrical conductors during assembly of the device, - said cover is configured to cooperate with the one or more conductors. electrical, so as to form one or more stops for holding said electrical conductor (s) during the introduction of said tongues, said protective cover is locked in position on said support, said device is configured to receive said tabs in the opposite of said protective cover, - the one or more fastening elements are configured to allow further indexing the mounting position of the electrical conductor (s) on the support, - the one or more fastening elements comprise at least one formed pion. on a plate of said support and said one or more electrical conductors comprise an opening c Complementary, said opening being able to receive said pin for mounting said conductor (s) on the plate, said one or more pins and openings have a complementary rectangular section, said one or more openings are bordered at least partially by one or more elements of said in engagement, the at least one electrical conductor comprises at least one contact element capable of being applied in electrical connection with one of the tongues of said supply, said protective cover includes at least one first support element able to abutting at least one or each of said conductors, in particular said contact elements, against one or said tongues, when mounting the device on the motor, said support element is located between said one or more pins and the one or more said contact elements, - said protective cover comprises a second support element disposed on the other side of said pin relative to the said first support member, said second support member being able to retain said one or more electrical conductors on the plate, in combination with said first support element, when mounting the device on the motor, - said one or more elements of said 'support are configured so that an establishment of the protective cover on the support is made possible only in case of correct positioning of said conductor or drivers. Note that, according to the invention, the cover can be kept at a distance from said electrical conductor or conductors. It is not necessary to secure them. The invention also relates to a method for mounting such an electrical connection device, comprising the following steps: - fixing said one or more electrical conductors on said support, by means of said fixing element, and - positioning said protective cover on said plate. The invention also relates to an electric motor, in particular a wiper motor, comprising such a connection device. Other features and advantages of the invention will become apparent on reading the following description of an exemplary embodiment given by way of illustration with reference to the appended figures. In these figures: - Figure 1 is a partial perspective view of a connection device according to an embodiment of the invention equipping an electric motor, - Figure 2 is a schematic sectional view of the engine, its power supply. and the connection device according to FIG. 1; FIG. 3 is a perspective view of the electrical conductors of the connecting device according to FIG. 1; FIG. 4 is a cross-sectional view of the support of the connection device of FIG. 1, the electrical conductors being in the course of assembly, - Figure 5 is a perspective view from above of the support of the connection device of Figure 4, the electrical conductors being mounted on the support, - Figure 6 is a similar view in FIG. 4, the protective cover of the aforementioned connection device being mounted; FIG. 7 is a view similar to FIG. 6, the contact tab of the aforementioned power supply being plugged in, and the Figure 8 is a view similar to Figure 5 of the support of the aforementioned connection device, the contact tabs of the device being plugged. Like reference numerals are used to designate identical or similar elements. As illustrated, the invention relates to an electrical connection device 1 between a circuit, not shown, for powering an electric motor 5, in particular a wiper motor of a motor vehicle, and tongues 7 of a power supply 15 of the engine, here of the tabs of a coal carrying plate of the electric motor. Said connection device 1 comprises one or more electrical conductors 3 mounted on a support of said device. Said support is here a closure plate 9 of a motor protection housing, on which the one or more conductors 3 are fixed.

The device 1 may also comprise an upper protective cover 11 configured to cover the electrical conductor or conductors 3. The cover 11 here encloses the electrical conductor (s) 3 on the closure plate 9 to protect them. Advantageously, said support 9 can form a base 30 for fixing the motor 5.

According to the invention, said support or closure plate 9 comprises one or more fastening elements 35, said one or more fastening elements 35 and said one or more electrical conductors 3 co-operating by complementarity of shapes to allow said electrical conductor (s) to be maintained 3 on said support 9. In other words, the one or more electrical conductors 3 are held on said support 9 by being inserted into the shapes provided on the latter. Said electrical connection device here comprises at least one engaging element 42 of said electrical conductors 3 on the support 9 or the closure plate, in particular a hooking element 42 on the fastening element or elements 35, this picking element being able to hold the electrical conductors 3 on the support 9 after they have been mounted thereon. Said cover 11 is further configured to cooperate with the at least one electrical conductor 3, so as to form one or more holding stops 15 of said electrical conductor (s) 3 during the insertion of said tabs 7 into the device. The cover 11 thus cooperates with the conductors 3, as shown in FIGS. 6 and 7, so as to bear against them and thus hold them on the support or closure plate 9, when connected with the tongues 20 7, which contributes to ensuring a reliable application of the connection of said conductors 3 with said tabs 7 so that the connection remains correct and durable. This support will be specified later. Said closure plate 9 receives, in the example, through an opening or upper face said protective cover 11, which is configured to be locked in closing on the closure plate 9. Said cover here comprises a hook 21, snapped on a periphery edge 23 of the closure plate 9. Said closure plate 9 is further configured to be plugged in by a lower recess 25 or said tongues 7. This recess 25 is formed on a lower face 27 of the plate 9, opposite the protective cover 11.

The tongues 7 are, for example, planar electrical conductive blades. They are here two in number, extending parallel to each other. These tabs 7 may be fixed projecting on the power supply 15 of the engine.

The electrical conductor or conductors 3, visible in particular in FIGS. 3 to 5, are here parts of a circuit, for example a circuit cut into strips 29 or tracks, comprising two contact elements 31 for said electrical connection with said tabs 7. Said strips 29 are here formed in L, being of generally planar conformation. They are advantageously arranged adjacent to one another in a housing 17 of the closure plate 9, being separated from each other by a separation spacer 33, for example from said support 9. The or said fixing elements 35 may be configured to further enable indexing of the mounting position of the electrical conductor (s) 3 on the support or closure plate 9. They thus allow the positioning of the conductor assembly 3 on the closure plate 9. They comprise here a pin 37 formed on the closure plate 9 and a complementary opening 39 formed on the conductor or conductors 3. Said opening 39 is provided to receive said pin 37 when mounting the device, more precisely or said conductors 3 on the closing plate 9. This indexing ensures a positioning of the conductors 3 on the support 9, here a positioning of the strips 29 in the corresponding housing 17 of the plate 9. Said pin 37 a in the example, as seen in Figure 5, a rectangular section, which advantageously locks any rotation of the strips 29 in their housing 17. It extends further perpendicularly to the plate closure 9, so that the mounting of the conductor or conductors 3 on the closure plate 9, said opening 39 being at the right of the pin 37, is provided by a simple translation, in particular insertion, of said conductors 3.

In addition, said pin 37 forms here, at its upper end 41, abutment of said translation movement of the protective cover 11. In doing so, it stops the movement of the cover 11 for locking it to the closure plate Said engagement element 42 of the conductors to the support 9 is here a perimeter edge fold 42, turned towards the inside of the volume formed by the support 9 and the cover 11. Bordering said opening 39 on at least one side, here two, this fold 42 is adapted to fix the conductor (s) 3 on the closure plate 9, as an anti-return element, after they have been mounted thereon. Indeed, when the one or more conductors 3 have been inserted into the closure plate 9, said fold 42 engaging in the material of the pin 37, at its base, locks the at least one conductor 3 in position, solidarily to the plate 9. It should be noted that said pin 37 is disposed near said contact element 31, so that said positioning indexing of the cut-out circuit 29 on the closure plate 9 is made near a connection portion 43, properly said contact element 31 to the tongue 7, in particular on the same straight portion of said conductor or conductors 3. This feature contributes to reducing the possible play of contact between the contact element 31 and the tongue 7, to the advantage of the electrical connection.

Said contact elements 31 of each of the conductors 3 of the illustrated embodiment are identical to each other and likewise the pins 37 and tabs 7 associated. These contact elements 31 may correspond, one to the positive pole and the other to the negative pole of the power supply of the motor 5.

They are adjacent, each cooperating with a said tongue 7, the two tongues 7 being also adjacent. Said contact elements 31 here each comprise said contact portion 43 which may be in the form of electrical conductive contact blade 43, for example metal, preferably flexible. The contact blade 43 is bent with an external part inclined relative to said tongue 7, so as to promote a sliding of the tongue 7 on the conductive contact blade 43, to the plugging of said tongue 7. Said conductive contact blade 43 is configured to elastically apply against said tongue 7, during plugging, which gives a contact pressure between the conductive contact blade 43 and the tongue 7, promoting said electrical connection. Said conductive contact blade 43 comprises a slot for having several points of contact with said tongue 7. Said protective cover 11 further comprises, in this case, at least one first support element 45 able to support at least one or each of said contact elements 31 against one or said tongues 7, when mounting the device on the motor 5. This support element 45, coming here on each strip 29 of said one or more electrical conductors 3, presses each of said contact elements 31, as shown in Figures 6 and 7, against said tongues 7, making reliable the contacting pressure of the contact element 43 with the corresponding tongue 7. The support is advantageously carried out in a flat zone 47 of each of the conductors 3. Said support is adjusted in particular to be below the elastic limit of the parts in contact.

Said support element 45 is situated between the at least one pin 37 and the at least one contact element 31. Said support element 45 is applied to the contact elements 31 when the device is mounted on the motor 5, here in FIG. the flat area 47 of the contact blades 43, this allows an adjusted positioning of the electrical connection or said contact blades 43 against said tongues 7. Said protective cover 11 may also include at least one second support element 49, disposed d on another side of said pin 37 relative to the first bearing element 45. This second bearing element 49 is provided here to abut the one or more conductors 3 on the closure plate 9, ie to apply abutting the strips 29 in their housing 17, in combination with said first support element 45, said tabs insertion 7. Thus, it carries with the first support element 45 a second support of said conductor or 3, here band s 29, on the closure plate 9, which stabilizes and consolidates the maintenance of the circuit 31sur closure plate 9 during insertion of the tabs 7 of the power supply 15.

It should be noted that the one or more support elements 45, 49 may advantageously be configured so that, when the protective cover 11 is locked on the closure plate 9, said locking is made possible only in the case of correct positioning. or the said conductors 3. Thus, conversely, if the locking or closing of the cover 11 is not permitted, this will translate an incorrect assembly of the device. Said first and second support elements 45, 49 are advantageously legs perpendicular to said closure plate 9. They are in particular made of one-piece material with said cover 11. Said cover 11 is preferably made of insulating material, in particular in plastic. Said protective cover 11 may also comprise a mounting positioning mark 55 of the protective cover 11 on the closure plate 9, constituted for example by a reference mark for positioning the parts in cooperation, in particular formed on a projecting element 51.

The mounting of the device is now described. The method comprises the following steps. It is a question of first positioning the one or more conductors 3 on said closure plate 9, taking into account said fixing element 35, for example by arranging said opening 39 of the conductors 3 in relation to said pin 37 of the closure plate 9, then to translate the at least one conductor 3 towards the inside of said closure plate 9 as far as it stops, where they fix by hooking 42. Then, said protective cover 11 is positioned on said closure plate 9, in particular using said positioning mark 55, and is pressed inwardly of said closure plate 9 to the stop. The protective cover 11 is locked on the closure plate 9.

The connection is then made by plugging said tongues 7 as shown in FIGS. 7 and 8. The invention thus provides a simple and reliable solution for providing an electrical connection between a cut-off circuit 29 for supplying DC motor power and tongues. 7 of charcoal wafer of an electric motor 5, in particular for a wiper motor of a motor vehicle.

Claims (15)

REVENDICATIONS1. Electrical connection device (1) between a power supply circuit (3) of an electric motor (5), in particular a motor vehicle wiper motor, and tongues (7) of a supply of said electric motor (5), said device comprising a support (9) and one or more electrical conductors (3) intended to come into contact with said tabs (7), said support (9) comprising one or more fastening elements (35), the or said fastening elements (35) and said one or more electrical conductors (3) cooperating in shape complementarity to enable said one or more electrical conductors (3) to be held on said support (9). 2. An electrical connection device according to claim 1, comprising a protective cover (11) covering said one or more electrical conductors (3), said cover (11) being configured to cooperate with said one or more electrical conductors (3), so as to forming one or more stops for holding said one or more electrical conductors (3) during the introduction of said tabs (7). 3. Electrical connection device according to claim 2, wherein said protective cover (11) is locked in position on said support (9). 4. Electrical connection device (1) according to any one of claims 2 or 3, configured to receive plugging said tabs (7) opposite said protective cover (11). An electrical connection device (1) according to any one of claims 2 to 4, wherein said one or more fasteners (35) are configured to further enable indexing of mounting positioning of the electrical conductor (s) ( 3) on the support (9). 6. Electrical connection device (1) according to any one of claims 2 to 5, wherein the one or more fastening elements (35) comprise at least one pin (37) formed on one side of said support (9) and the or said electrical conductors (3) comprise a complementary opening (39), said opening (39) being able to receive said pin (37) when mounting said conductor (s) (3) on the support (9). 7. Electrical connection device (1) according to claim 6, wherein said one or more pins (37) and openings (39) have a complementary rectangular section. 8. An electrical connection device (1) according to any one of claims 6 and 7, wherein the one or more openings (39) are bordered by one or more engaging elements (42). 9. Electrical connection device (1) according to any one of claims 2 to 8, wherein the or said electrical conductors (3) comprise at least one contact element (31) adapted to be applied in electrical connection with a tabs (7) of said supply. 10. Electrical connection device (1) according to claim 9, wherein said protective cover (11) comprises at least a first support element (45) adapted to support at least one or each of said elements of contact (31) against one or said tongues (7), when mounting the device on the engine. 11. Electrical connection device (1) according to the preceding claim, wherein said bearing element (45) is located between said at least one pin (37) and said contact element (s) (31). Electrical connection device (1) according to claim 10 or 11, wherein said protective cover (11) comprises a second support element (49) disposed on the other side of said pin (37) relative to said first element support member (45), said second support element (49) being adapted to retain the at least one electrical conductor (3) on the support (9), in combination with said first support element (45), during the mounting the device on the engine. 13. Electrical connection device (1) according to any one of claims 10 to 12 wherein the or said support elements (45, 49) are configured so that a positioning of the protective cover (3) on the support (9) is made possible only in case of correct positioning of said electrical conductor (s) (3). 14. A method of mounting an electrical connection device (1) according to any one of claims 2 to 13, comprising the steps of: - fixing the one or more electrical conductors (3) on said support (9), by means of said fixing element (35), and - positioning said protective cover (11) on the support (9). 20 15. Electric motor comprising a connection device (1) according to any one of claims 1 to 13.