EP3231046A1 - Assembly comprising a brush cage and a spiral spring and corresponding brush holder, electric motor and motor vehicle starter - Google Patents

Assembly comprising a brush cage and a spiral spring and corresponding brush holder, electric motor and motor vehicle starter

Info

Publication number
EP3231046A1
EP3231046A1 EP15818000.0A EP15818000A EP3231046A1 EP 3231046 A1 EP3231046 A1 EP 3231046A1 EP 15818000 A EP15818000 A EP 15818000A EP 3231046 A1 EP3231046 A1 EP 3231046A1
Authority
EP
European Patent Office
Prior art keywords
arm
width
spring
brush
cage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15818000.0A
Other languages
German (de)
French (fr)
Inventor
Marie-Ange NALIN
Pierre Mollon
Wilfried Pays
Maximilien Gentil
Alain Bost
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Equipements Electriques Moteur SAS
Original Assignee
Valeo Equipements Electriques Moteur SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Equipements Electriques Moteur SAS filed Critical Valeo Equipements Electriques Moteur SAS
Publication of EP3231046A1 publication Critical patent/EP3231046A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/38—Brush holders
    • H01R39/41—Brush holders cartridge type
    • H01R39/415—Brush holders cartridge type with self-recoiling spring
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/59—Means structurally associated with the brushes for interrupting current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/38—Brush holders
    • H01R39/381—Brush holders characterised by the application of pressure to brush
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders
    • H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders
    • H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
    • H02K5/145—Fixedly supported brushes or brush holders, e.g. leaf or leaf-mounted brushes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders
    • H02K5/143—Means for supporting or protecting brushes or brush holders for cooperation with commutators
    • H02K5/148—Slidably supported brushes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2201/00—Connectors or connections adapted for particular applications
    • H01R2201/10—Connectors or connections adapted for particular applications for dynamoelectric machines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2201/00—Connectors or connections adapted for particular applications
    • H01R2201/26—Connectors or connections adapted for particular applications for vehicles

Definitions

  • the invention relates to an assembly comprising a brush cage and a spiral spring, as well as to the brush holder, the electric motor and the corresponding starter.
  • the invention finds a particularly advantageous, but not exclusive, application with motor vehicle starters, in particular those installed in vehicles equipped with the function of stopping and automatically restarting the engine (so-called "stop and start” function). " in English).
  • a brush holder is mounted on the rotor shaft of a starter so as to cooperate the brushes with an electrical collector integral with the rotor shaft.
  • the brush holder comprises a support plate carrying a set of cages each serving as a housing for a broom.
  • the brushes made of electrically conductive material allow the power supply of the rotor by switching the electric current in the conductors of the rotor.
  • each blade has a face intended to rub against the conductive blades of the collector connected to the rotor winding.
  • An elastic means such as a spring, exerts on each broom received in a cage a force in the direction of the manifold to ensure contact between the blade and the collector blades.
  • the brushes have alternating polarities.
  • the positive polarity brushes are electrically connected, via their respective braid, to an inter-brush connector which is also electrically connected to the power wire from the starter contactor.
  • the brushes for the current return are electrically connected to the mass of the machine by means of their respective braid welded to the plate.
  • a spiral type spring comprising a wound portion mounted on a leg and an arm extending from one end of the portion. wound to bear on an end face of the brush opposite the face in contact with the collector blades.
  • the arm passes through an opening in a side wall of the brush cage.
  • the problem is to be able to make springs with a relatively large thrust force knowing that the diameter of the wound portion is limited because of the need to obtain a compact assembly and that the thickness is also limited in order to be able to use springs low cost standards.
  • the invention therefore proposes to modify the width parameter of the spring in order to adapt its force, and this without modifying the structure of the broom cage inasmuch as an increase in the opening allowing the passage of the spring arm would weaken mechanically. the cage.
  • the invention proposes an assembly comprising a brush cage and a spiral spring
  • said spiral spring comprising an axis, a portion wound around said axis and an arm extending from one end of said wound portion
  • said broom cage comprising at least one side wall provided with an opening for the passage of said arm through said side wall so that one end of said arm can bear on at least a part of an end face a broom,
  • said arm comprises a first portion whose width measured along said axis is different from the width of said wound portion measured along said axis of said spiral spring.
  • said arm comprises a first portion whose width measured along said axis is less than the width of said wound portion measured along said axis of said spring.
  • the first portion of said arm is at least the portion of the arm passing through said opening of said side wall between a start of travel of said spring and a limit of said spring.
  • said arm comprises a second portion extending between said first portion and the end of said arm located in said broom cage and in that the width of said second portion is greater than the width of said first portion.
  • the width of said second portion is equal to the width of said wound portion of said spring.
  • said first portion of said arm has a width of between 4 and 8mm.
  • said wound portion has a width of more than 1 mm with respect to the width of said first portion of said arm.
  • said brush cage comprises a tab extending outside a housing for said brush, said wound portion of said spring being mounted around said tab.
  • the invention also relates to an electric motor brush holder equipped with an assembly as previously defined.
  • the invention further relates to an electric motor comprising a brush holder as previously defined.
  • the invention also relates to a motor vehicle starter comprising an electric motor as defined above.
  • Figure 1 is a perspective view of an electric motor brush holder according to the present invention
  • Figure 2 is a perspective view of the plate of the brush holder of Figure 1;
  • Figures 3a to 3c respectively correspond to a side view and two perspective views according to two different viewing angles illustrating a first embodiment of a broom cage according to the present invention
  • Fig. 4 is a perspective view illustrating a second embodiment of a broom cage according to the present invention.
  • Fig. 5 is a perspective view illustrating a third embodiment of a broom cage according to the present invention
  • Figures 6a to 6c are perspective views illustrating the three different embodiments of a spiral spring according to the present invention.
  • FIG 1 shows a brush holder 10 according to the invention for use with a motor vehicle starter.
  • This brush holder 10 comprises a support plate 12 of substantially annular shape on which is fixed a set of stands 13 each serving as a housing for a brush 15.
  • An axis X of the support plate 12 corresponds to the axis of the holder. brooms 10.
  • the support plate 12 clearly visible in FIG. 2 is a one-piece piece comprising a metal plate 121 and overmolded layers 122 made on either side of the metal plate 121.
  • the overmolded layers 122 are made by means of a plastic material ensuring good electrical insulation.
  • the overmolded layers 122 cover all the risk areas of the plate 12, that is to say, all the areas where a short circuit could appear.
  • the overmolded layers 122 are heat sensitive and deformable from a predetermined temperature so as to cause a short circuit in case of overheating.
  • the plastic material used for overmolded layers 122 is a thermoplastic material such as polyamide PA4.6 or PA6.6 or fiber-loaded polypropylene PPS.
  • the support plate 12 and the cages 13 that it carries are fixed on a cover (not shown) forming a rear bearing for the rotor shaft of the electric machine.
  • the central portion of the plate 12 has an orifice 16 through which the assembly that it forms with the brush cages 13 and the brushes 15 is mounted around the starter rotor shaft.
  • Each brush 15 is slidably mounted inside a cage 13 which is open on the X-axis side to allow the brushes 15 to be placed in electrical contact with blades carried by a commutator of an electric machine rotor. (not shown)
  • the brushes 15 have alternating polarities.
  • the brushes 15 of positive polarity are electrically connected, via their respective braid 19, to an inter-brush connector 20 which is also electrically connected to the supply wire from the contactor starter.
  • the inter-brush connector 20 is connected to the supply wire via a pin 21 passing through a grommet 22 cooperating with the starter casing to seal the brush holder 10.
  • the positive brushes 15 and their corresponding cages 13 are electrically isolated from the negative polarity for proper operation of the starter. This insulation is obtained by the overmolded layers 122.
  • the flexible braids 19 are advantageously made of copper or copper alloy to facilitate welding on the plate 121. The braids 19 may also play a fuse role. Furthermore, the brushes 15 of negative polarity for the current return are electrically connected to the mass of the machine by means of their respective braid 19 welded to the plate 121 of the plate 12.
  • each brush cage 13 has a housing 23 for the brush 15 defined by two side walls 26, 27 parallel vis-à-vis interconnected by a wall 28 upper link.
  • Each cage 13 is fixed on the plate 12 by means of a fixing device 31 described in more detail below belonging to end walls 32, 33 coming from the lower edges of the side walls 26, 27.
  • a spiral spring 36 associated with each cage 13 radially biases the corresponding blade 15 to contact blades of the collector.
  • each spring 36 comprises a wound portion 37 mounted around a lug 38 extending axially with respect to the X axis and an arm 39 intended to bear against a face of the brush 15 opposite to the face in contact with the collector blades.
  • the tab 38 which extends outside the housing 23 of the blade 15, is in this case obtained by folding one of the end walls 32, 33 of each cage 13.
  • the side wall 26 has an opening 43 for the passage of the arm 39 of the spring 36.
  • This side wall 26 has a length L 0, measured in a direction perpendicular to the X axis, between a first end 51 farthest from the manifold and a second end 52 closest to the manifold (located on the side opposite the arm 39 of the spring).
  • the opening 43 comprises at least a first portion 431 between the two ends 51, 52 which widens widening towards the second end 52, that is to say that the width L1 of this first portion 431 measured next the X axis increases when moving towards the second end 52.
  • This first portion 431 of the opening 43 comprises two edges 44, 45 vis-à-vis formed in the side wall 26.
  • the opening 43 further comprises a second portion 432 extending between the first end 51 and the first portion 431. This second portion 432 widens widening toward the first end 51, that is to say that the width L2 of this second portion 432 measured along the X axis increases when moving towards the first end 51. This second portion 432 makes it easier to insert and center the arm 39 of the spring 36.
  • the opening 43 comprises a third portion 433 extending between the second end 52 and the first portion 431.
  • This third portion 433 widens to widen towards the first end 51, that is to say that the width L3 of this third portion 433 measured along the X axis increases when moving towards the first end 51.
  • the opening 43 comprises a fourth portion 434 extending between the second end 52 and the third portion 433. This fourth portion
  • this fourth portion 434 is delimited by parallel edges of the wall 26.
  • this fourth portion 434 has a width L4 measured along the substantially constant axis X.
  • the edges of this portion 434 separate two walls 55, 56 forming the wall 26. These two generally L-shaped walls 55, 56 are interconnected by a fin 57.
  • the fin 57 comprises two parts 571, 572 extending in two different planes inclined with respect to each other, as is clearly visible in FIG. 3c. It should be noted that the fourth portion 434 of the opening 43 can be extended in a notch 58 formed in the fin 57 to allow the passage of the braid 19 of the brush 15 housed in the corresponding cage 13 closest to the collector. As can be seen in FIG. 3b, the other side wall 27 has an opening 43 'having a first portion 431' and a second portion 432 'having a configuration similar to the first portion 431 and the second portion 432 respectively.
  • the inclined edges 44 'and 45' formed in the wall 27 are interconnected by an edge 46 'having an orientation parallel to the axis X.
  • the side wall 27 is formed by two walls which are interconnected on the collector side by a strip of material extending in the plane of the wall 27.
  • only one of the two edges 44 'and 45' is inclined.
  • a fin 59 is derived from an edge of the wall 27 to mechanically stiffen the cage 13.
  • the spring 36 is positioned on the side of the wall 27, so that its arm 39 passes through the portions 431 ', 432' of the opening 43 '; while the braid 19 is positioned on the side of the wall 26 to be able to pass at the end of travel of the spring 36 by the open portions 433, 434 as well as by the notch 58 of the fin 57 so that the braid 19 can move as close as possible to the manifold to maximize the use volume of the blade 15.
  • the opening 43 of the wall 26 is devoid of a fourth portion 434, the third portion 433 extending directly in the notch 58 made in the fin 57.
  • the opening 43 separates two walls 55, 56 L-shaped interconnected by the fin 59.
  • the side wall 27 provided with its opening 43 ' and two corresponding portions 431 'and 432' are similar to that of the embodiment of Figures 3a to 3c.
  • the two walls 26, 27 are symmetrical and have identical openings 43 having a first portion 431, a second portion 432, and a third portion 433 extending into a notch 58 made in the corresponding fin 57, 59, as in the embodiment of FIG. 4.
  • the fixing system to the plate 12 is formed by two pairs of legs 61, 62.
  • the legs 61, 62 of each pair are derived from two edges vis-à-vis the end walls 32, 33.
  • a leg 61 of each pair is intended to pass through the plate 12 through a hole 63 made according to its thickness (see Figure 2).
  • the other leg 62 of each pair bears against one side of the inner contour delimiting the orifice 16.
  • the legs 61, 62 of each pair are intended to be folded towards each other against the plate 12.
  • the fastening system 31 comprises at least one rivet passing through the plate 12 and an end wall 32, 33 of the broom cage 13.
  • Each cage 13 may in an exemplary embodiment be obtained by folding a plate of thin sheet so as to form substantially an omega whose end branches are fixed on the plate 12.
  • the holes 63 receiving the legs 61, 62 of the cages 13 of negative polarity and the areas of the plate 12 in contact with the cages 13 receiving the brushes 15 of negative polarity are not electrically isolated, so that a electrical contact can intervene between the cages 13 of negative polarity and the plate 121 via the legs 61, 62.
  • This contact is not harmful to the operation of the starter, insofar as it participates in establishing the electrical contact between the parts intended to be at the same electrical potential, in this case the ground potential in this application.
  • the coiled portion 37 of the spring 36 is formed by a plurality of coaxial coils 371 about a Y axis.
  • the arm 39 extends from one end of the coiled portion 37 mounted around the lug 38.
  • the arm 39 is intended to bear against the rear face of the brush 15 opposite the face of the brush 15 bears against the blades of the collector.
  • the arm 39 comprises a portion 391 whose width L5 measured along the Y axis is less than the width L6 of the wound portion 37 measured along the Y axis.
  • This portion 391 is delimited. by two recesses 68 coming from the part of the arm 39 having a width identical to the width L6 of the wound portion 37 and extending towards the inside of the material band of the arm 39.
  • This portion 391 of the arm 39 of reduced width is at least equal to the length of the portion of the arm 39 passing through the opening 43 of the side wall 26 between the start of travel of the spring 36 and the end of travel of the spring 36. specifies here that the start of travel of the spring 36 corresponds to the position of the arm 39 of the spring 36 for a blade 15 at the beginning of life having a maximum length, while the end of stroke of the spring 36 corresponds to a position of the arm 39 of the spring 36 for a broom 15 at the end of life having a minimum length. In this case, the portion 391 extends to the end of the arm 39 located in the cage 13 which bears against the blade 15.
  • the portion 391 of reduced width is substantially equal to the length of the portion of the arm 39 passing through the opening 43 of the side wall 26 between the beginning and end of travel of the spring 36.
  • the arm 39 may comprise a second portion 392 extending between the first portion 391 and the end of the arm 39 located in the cage 13.
  • the width L7 of the second portion 392 is greater than the width L5 of the first portion 391.
  • the width of the second portion 392 is equal to the width L6 of the wound portion 37.
  • the portion 392 is delimited at one end by the two recesses 68 and the other side by two other similar recesses 69 located between the first 391 and the second 392 portions.
  • the first portion 391 has a width L5 of between 4 and 8 mm.
  • the wound portion 37 has a width L6 of more than 1 mm with respect to the width L5 of the first portion 391.
  • the metal strip forming the spiral spring 36 has a thickness of between 0.25 and 0.7 mm.
  • the diameter of the wound portion 37 is of the order of 10 mm. Of course, these dimensions may vary depending on the application.
  • the arm 39 of the spring 36 has a portion 391 having a width L5 greater than the width L6 of the wound portion 37, as shown in Figure 6c.
  • the recesses 68 extend from the part of the arm 39 having the same width as the wound portion 37 towards the outside of the material band forming the spring 36.
  • the end of the arm 39 of the spring 36 is supported only against a portion of the end face. This part may correspond for example to the bottom of a groove 75 to facilitate guiding the arm 39 of the spring 36 during its displacement, as shown in Figure 1.
  • the brush holder 10 comprises more than four brushes 15, each brush 15 being for example associated with another brush positioned on the opposite side of the plate 12.
  • the brush holder 10 is here an electric motor brush holder of a motor vehicle starter.
  • the brush holder 10 could also belong to an alternator or an alternator-starter.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

The invention relates mainly to an assembly comprising a brush cage and a spiral spring (36), said spiral spring (36) comprising an axis (Y), a wound part (37) wound about said axis (Y) and an arm (39) extending from one end of said wound part (37), - said brush cage comprising at least one lateral wall provided with an opening for the passage of said arm (39) through said lateral wall so that one end of said arm (39) can press against at least part of an end face of a brush, characterized in that said arm (39) comprises a first portion (391) of which the width (L5) measured along said axis (Y) is different from the width (L6) of said wound part (37) measured along said axis (Y) of said spiral spring (36).

Description

ENSEMBLE COMPORTANT UNE CAGE A BALAI ET UN RESSORT A SPIRALES, PORTE-BALAIS, MOTEUR ELECTRIQUE, ET DEMARREUR  ASSEMBLY COMPRISING A BRUSH CAGE AND A SPIRAL SPRING, BRUSH HOLDER, ELECTRIC MOTOR, AND STARTER
DE VEHICULE AUTOMOBILE CORRESPONDANTS  OF CORRESPONDING MOTOR VEHICLE
L'invention porte sur un ensemble comportant une cage à balai et un ressort à spirales, ainsi que sur le porte-balais, le moteur électrique, et le démarreur correspondants. L'invention trouve une application particulièrement avantageuse, mais non exclusive, avec les démarreurs de véhicule automobile, en particulier ceux installés dans les véhicules équipés de la fonction d'arrêt et de re-démarrage automatique du moteur thermique (fonction dite "stop and start" en anglais). The invention relates to an assembly comprising a brush cage and a spiral spring, as well as to the brush holder, the electric motor and the corresponding starter. The invention finds a particularly advantageous, but not exclusive, application with motor vehicle starters, in particular those installed in vehicles equipped with the function of stopping and automatically restarting the engine (so-called "stop and start" function). " in English).
De façon connue en soi, un porte-balais est monté sur l'arbre du rotor d'un démarreur de manière à faire coopérer les balais avec un collecteur électrique solidaire de l'arbre du rotor. Le porte-balais comporte une platine de support portant un ensemble de cages servant chacune de logement à un balai. Les balais réalisés en matériau électriquement conducteur permettent l'alimentation électrique du rotor par commutation du courant électrique dans les conducteurs du rotor. In a manner known per se, a brush holder is mounted on the rotor shaft of a starter so as to cooperate the brushes with an electrical collector integral with the rotor shaft. The brush holder comprises a support plate carrying a set of cages each serving as a housing for a broom. The brushes made of electrically conductive material allow the power supply of the rotor by switching the electric current in the conductors of the rotor.
A cet effet, chaque balai comporte une face destinée à venir frotter contre les lames conductrices du collecteur reliées au bobinage du rotor. Un moyen élastique, tel qu'un ressort, exerce sur chaque balai reçu dans une cage un effort en direction du collecteur pour assurer le contact entre le balai et les lames du collecteur. For this purpose, each blade has a face intended to rub against the conductive blades of the collector connected to the rotor winding. An elastic means, such as a spring, exerts on each broom received in a cage a force in the direction of the manifold to ensure contact between the blade and the collector blades.
Les balais présentent des polarités alternées. Ainsi, les balais de polarité positive sont reliés électriquement, via leur tresse respective, à un connecteur inter-balais auquel est également connecté électriquement le fil d'alimentation issu du contacteur du démarreur. Par ailleurs, les balais destinés au retour de courant sont reliés électriquement à la masse de la machine au moyen de leur tresse respective soudée sur la platine. The brushes have alternating polarities. Thus, the positive polarity brushes are electrically connected, via their respective braid, to an inter-brush connector which is also electrically connected to the power wire from the starter contactor. Furthermore, the brushes for the current return are electrically connected to the mass of the machine by means of their respective braid welded to the plate.
Dans certaines configurations de porte-balais, il est connu d'utiliser un ressort de type à spirales comprenant une partie enroulée montée sur une patte ainsi qu'un bras s'étendant à partir d'une extrémité de la partie enroulée destiné à venir en appui sur une face d'extrémité du balai opposée à la face en contact avec les lames du collecteur. Pour permettre au ressort d'appliquer une poussée sur le balai, le bras passe par l'intermédiaire d'une ouverture ménagée dans une paroi latérale de la cage à balai. Le problème est de pouvoir réaliser des ressorts ayant une force de poussée relativement importante sachant que le diamètre de la partie enroulée est limitée du fait de la nécessité d'obtenir un ensemble compact et que l'épaisseur est également limitée afin de pouvoir utiliser des ressorts standards à coût réduit. L'invention propose donc de modifier le paramètre de largeur du ressort afin d'adapter sa force, et cela sans modifier la structure de la cage à balai dans la mesure où une augmentation de l'ouverture permettant le passage du bras du ressort fragiliserait mécaniquement la cage. In certain brush holder configurations, it is known to use a spiral type spring comprising a wound portion mounted on a leg and an arm extending from one end of the portion. wound to bear on an end face of the brush opposite the face in contact with the collector blades. To allow the spring to apply a thrust on the blade, the arm passes through an opening in a side wall of the brush cage. The problem is to be able to make springs with a relatively large thrust force knowing that the diameter of the wound portion is limited because of the need to obtain a compact assembly and that the thickness is also limited in order to be able to use springs low cost standards. The invention therefore proposes to modify the width parameter of the spring in order to adapt its force, and this without modifying the structure of the broom cage inasmuch as an increase in the opening allowing the passage of the spring arm would weaken mechanically. the cage.
A cet effet, l'invention propose un ensemble comportant une cage à balai et un ressort à spirales, For this purpose, the invention proposes an assembly comprising a brush cage and a spiral spring,
- ledit ressort à spirales comprenant un axe, une partie enroulée autour dudit axe et un bras s'étendant à partir d'une extrémité de ladite partie enroulée, said spiral spring comprising an axis, a portion wound around said axis and an arm extending from one end of said wound portion,
- ladite cage à balai comprenant au moins une paroi latérale munie d'une ouverture pour le passage dudit bras à travers ladite paroi latérale en sorte qu'une extrémité dudit bras puisse être en appui sur au moins une partie d'une face d'extrémité d'un balai, said broom cage comprising at least one side wall provided with an opening for the passage of said arm through said side wall so that one end of said arm can bear on at least a part of an end face a broom,
caractérisé en ce que ledit bras comprend une première portion dont la largeur mesurée suivant ledit axe est différente de la largeur de ladite partie enroulée mesurée suivant ledit axe dudit ressort à spirales. Ainsi, la différence de hauteur entre une partie du bras et la partie enroulée du ressort à spirales permet de décorréler la partie fonctionnelle du ressort de génération de puissance par rapport à la partie fonctionnelle d'appui sur le balai. Il est ainsi possible de maximiser la puissance du ressort tout en garantissant une zone d'appui adaptée entre l'extrémité du bras du ressort et la face du balai correspondante. characterized in that said arm comprises a first portion whose width measured along said axis is different from the width of said wound portion measured along said axis of said spiral spring. Thus, the difference in height between a portion of the arm and the wound portion of the spiral spring makes it possible to decorrelate the functional part of the power generation spring with respect to the functional support part on the brush. It is thus possible to maximize the power of the spring while ensuring a suitable support zone between the end of the spring arm and the corresponding face of the brush.
Selon une réalisation, ledit bras comprend une première portion dont la largeur mesurée suivant ledit axe est inférieure à la largeur de ladite partie enroulée mesurée suivant ledit axe dudit ressort. Selon une réalisation, la première portion dudit bras est au minimum la portion du bras traversant ladite ouverture de ladite paroi latérale entre un début de course dudit ressort et une fin de course dudit ressort. According to one embodiment, said arm comprises a first portion whose width measured along said axis is less than the width of said wound portion measured along said axis of said spring. According to one embodiment, the first portion of said arm is at least the portion of the arm passing through said opening of said side wall between a start of travel of said spring and a limit of said spring.
Selon une réalisation, ledit bras comporte une seconde portion s'étendant entre ladite première portion et l'extrémité dudit bras située dans ladite cage à balai et en ce que la largeur de ladite seconde portion est supérieure à la largeur de ladite première portion. According to one embodiment, said arm comprises a second portion extending between said first portion and the end of said arm located in said broom cage and in that the width of said second portion is greater than the width of said first portion.
Selon une réalisation, la largeur de ladite seconde portion est égale à la largeur de ladite partie enroulée dudit ressort. Selon une réalisation, ladite première portion dudit bras présente une largeur comprise entre 4 et 8mm. In one embodiment, the width of said second portion is equal to the width of said wound portion of said spring. According to one embodiment, said first portion of said arm has a width of between 4 and 8mm.
Selon une réalisation, ladite partie enroulée présente une largeur de plus de 1 mm par rapport à la largeur de ladite première portion dudit bras. According to one embodiment, said wound portion has a width of more than 1 mm with respect to the width of said first portion of said arm.
Selon une réalisation, ladite cage à balai comprend une patte s'étendant en dehors d'un logement pour ledit balai, ladite partie enroulée dudit ressort étant montée autour de ladite patte. In one embodiment, said brush cage comprises a tab extending outside a housing for said brush, said wound portion of said spring being mounted around said tab.
L'invention a également pour objet un porte-balais de moteur électrique équipé d'un ensemble tel que précédemment défini. The invention also relates to an electric motor brush holder equipped with an assembly as previously defined.
L'invention concerne en outre un moteur électrique comportant un porte- balais tel que précédemment défini. The invention further relates to an electric motor comprising a brush holder as previously defined.
L'invention porte également sur un démarreur de véhicule automobile comportant un moteur électrique tel que précédemment défini. The invention also relates to a motor vehicle starter comprising an electric motor as defined above.
L'invention sera mieux comprise à la lecture de la description qui suit et à l'examen des figures qui l'accompagnent. Ces figures ne sont données qu'à titre illustratif mais nullement limitatif de l'invention. The invention will be better understood on reading the description which follows and on examining the figures which accompany it. These figures are given for illustrative but not limiting of the invention.
La figure 1 est une vue en perspective d'un porte-balais de moteur électrique selon la présente invention; La figure 2 est une vue en perspective de la platine du porte-balais de la figure 1 ; Figure 1 is a perspective view of an electric motor brush holder according to the present invention; Figure 2 is a perspective view of the plate of the brush holder of Figure 1;
Les figures 3a à 3c correspondent respectivement à une vue de côté et à deux vues en perspective selon deux angles de vue différents illustrant un premier mode de réalisation d'une cage à balai selon la présente invention; Figures 3a to 3c respectively correspond to a side view and two perspective views according to two different viewing angles illustrating a first embodiment of a broom cage according to the present invention;
La figure 4 est une vue en perspective illustrant un deuxième mode de réalisation d'une cage à balai selon la présente invention; Fig. 4 is a perspective view illustrating a second embodiment of a broom cage according to the present invention;
La figure 5 est une vue en perspective illustrant un troisième mode de réalisation d'une cage à balai selon la présente invention; Les figures 6a à 6c sont des vues en perspective illustrant les trois différents modes de réalisation d'un ressort à spirales selon la présente invention; Fig. 5 is a perspective view illustrating a third embodiment of a broom cage according to the present invention; Figures 6a to 6c are perspective views illustrating the three different embodiments of a spiral spring according to the present invention;
Les éléments identiques, similaires, ou analogues conservent la même référence d'une figure à l'autre. Identical, similar or similar elements retain the same reference from one figure to another.
La figure 1 montre un porte-balais 10 selon l'invention destiné à être utilisé avec un démarreur de véhicule automobile. Ce porte-balais 10 comporte une platine de support 12 de forme sensiblement annulaire sur laquelle est fixé un ensemble de cages 13 servant chacune de logement à un balai 15. Un axe X de la platine de support 12 correspond à l'axe du porte-balais 10. Figure 1 shows a brush holder 10 according to the invention for use with a motor vehicle starter. This brush holder 10 comprises a support plate 12 of substantially annular shape on which is fixed a set of stands 13 each serving as a housing for a brush 15. An axis X of the support plate 12 corresponds to the axis of the holder. brooms 10.
La platine de support 12 bien visible sur la figure 2 est une pièce monobloc comportant une plaque métallique 121 et des couches surmoulées 122 réalisées de part et d'autre de la plaque métallique 121 . Les couches surmoulées 122 sont réalisées au moyen d'une matière plastique assurant une bonne isolation électrique. Les couches surmoulées 122 recouvrent toutes les zones à risque de la platine 12, c'est-à-dire, toutes les zones où pourrait apparaître un court-circuit. Les couches surmoulées 122 sont sensibles à la chaleur et déformables à partir d'une température prédéterminée afin de pouvoir provoquer un court-circuit en cas de surchauffe. Typiquement, la matière plastique utilisée pour les couches surmoulées 122 est une matière thermoplastique telle qu'un polyamide PA4.6 ou PA6.6 ou un polypropylène PPS chargé en fibres. La platine de support 12 et les cages 13 qu'elle porte viennent se fixer sur un capot (non représenté) formant un palier arrière pour l'arbre de rotor de la machine électrique. En outre, la partie centrale de la platine 12 comporte un orifice 16 par lequel l'ensemble qu'elle forme avec les cages à balai 13 et les balais 15 est monté autour de l'arbre du rotor du démarreur. The support plate 12 clearly visible in FIG. 2 is a one-piece piece comprising a metal plate 121 and overmolded layers 122 made on either side of the metal plate 121. The overmolded layers 122 are made by means of a plastic material ensuring good electrical insulation. The overmolded layers 122 cover all the risk areas of the plate 12, that is to say, all the areas where a short circuit could appear. The overmolded layers 122 are heat sensitive and deformable from a predetermined temperature so as to cause a short circuit in case of overheating. Typically, the plastic material used for overmolded layers 122 is a thermoplastic material such as polyamide PA4.6 or PA6.6 or fiber-loaded polypropylene PPS. The support plate 12 and the cages 13 that it carries are fixed on a cover (not shown) forming a rear bearing for the rotor shaft of the electric machine. In addition, the central portion of the plate 12 has an orifice 16 through which the assembly that it forms with the brush cages 13 and the brushes 15 is mounted around the starter rotor shaft.
Chaque balai 15 est monté à coulissement à l'intérieur d'une cage 13 laquelle est ouverte du côté de l'axe X pour permettre la mise en contact électrique des balais 15 avec des lames portées par un collecteur d'un rotor de machine électrique (non représenté). Les balais 15 présentent des polarités alternées. Ainsi, les balais 15 de polarité positive sont reliés électriquement, via leur tresse 19 respective, à un connecteur inter-balais 20 auquel est également connecté électriquement le fil d'alimentation issu du contacteur du démarreur. En l'occurrence, le connecteur inter-balais 20 est relié au fil d'alimentation via un pion 21 traversant un passe-fil 22 coopérant avec la carcasse du démarreur pour assurer l'étanchéité du porte-balais 10. Each brush 15 is slidably mounted inside a cage 13 which is open on the X-axis side to allow the brushes 15 to be placed in electrical contact with blades carried by a commutator of an electric machine rotor. (not shown) The brushes 15 have alternating polarities. Thus, the brushes 15 of positive polarity are electrically connected, via their respective braid 19, to an inter-brush connector 20 which is also electrically connected to the supply wire from the contactor starter. In this case, the inter-brush connector 20 is connected to the supply wire via a pin 21 passing through a grommet 22 cooperating with the starter casing to seal the brush holder 10.
Les balais positifs 15 et leurs cages 13 correspondantes sont isolés électriquement de la polarité négative pour un bon fonctionnement du démarreur. Cette isolation est obtenue par les couches surmoulées 122. Les tresses souples 19 sont avantageusement en cuivre ou en alliage de cuivre pour faciliter le soudage sur la plaque 121 . Les tresses 19 pourront également jouer un rôle de fusible. Par ailleurs, les balais 15 de polarité négative destinés au retour de courant sont reliés électriquement à la masse de la machine au moyen de leur tresse 19 respective soudée sur la plaque 121 de la platine 12. The positive brushes 15 and their corresponding cages 13 are electrically isolated from the negative polarity for proper operation of the starter. This insulation is obtained by the overmolded layers 122. The flexible braids 19 are advantageously made of copper or copper alloy to facilitate welding on the plate 121. The braids 19 may also play a fuse role. Furthermore, the brushes 15 of negative polarity for the current return are electrically connected to the mass of the machine by means of their respective braid 19 welded to the plate 121 of the plate 12.
Plus précisément, comme cela est bien visible sur les figures 3a à 3c, chaque cage à balai 13 présente un logement 23 pour le balai 15 délimité par deux parois latérales 26, 27 parallèles en vis-à-vis reliées entre elles par une paroi 28 de liaison supérieure. Chaque cage 13 est fixée sur la platine 12 au moyen d'un dispositif de fixation 31 décrit plus en détails ci-après appartenant à des parois d'extrémité 32, 33 issues des bords inférieurs des parois latérales 26, 27. Par ailleurs, un ressort à spirales 36 associé à chaque cage 13 sollicite radialement le balai 15 correspondant vers des lames de contact du collecteur. A cet effet, chaque ressort 36 comporte une partie enroulée 37 montée autour d'une patte 38 s'étendant axialement par rapport à l'axe X ainsi qu'un bras 39 destiné à venir en appui contre une face du balai 15 opposée à la face en contact avec les lames du collecteur. La patte 38, qui s'étend en dehors du logement 23 du balai 15, est en l'occurrence obtenue par pliage d'une des parois d'extrémité 32, 33 de chaque cage 13. More specifically, as is clearly visible in Figures 3a to 3c, each brush cage 13 has a housing 23 for the brush 15 defined by two side walls 26, 27 parallel vis-à-vis interconnected by a wall 28 upper link. Each cage 13 is fixed on the plate 12 by means of a fixing device 31 described in more detail below belonging to end walls 32, 33 coming from the lower edges of the side walls 26, 27. Furthermore, a spiral spring 36 associated with each cage 13 radially biases the corresponding blade 15 to contact blades of the collector. For this purpose, each spring 36 comprises a wound portion 37 mounted around a lug 38 extending axially with respect to the X axis and an arm 39 intended to bear against a face of the brush 15 opposite to the face in contact with the collector blades. The tab 38, which extends outside the housing 23 of the blade 15, is in this case obtained by folding one of the end walls 32, 33 of each cage 13.
Comme on peut le voir clairement sur la figure 3a, la paroi latérale 26 comporte une ouverture 43 pour le passage du bras 39 du ressort 36. Cette paroi latérale 26 a une longueur L0, mesurée suivant un direction perpendiculaire à l'axe X, entre une première extrémité 51 la plus éloignée du collecteur et une seconde extrémité 52 la plus proche du collecteur (située du côté opposé au bras 39 du ressort). L'ouverture 43 comprend au moins une première portion 431 entre les deux extrémités 51 , 52 qui s'évase en s'élargissant vers la seconde extrémité 52, c'est-à-dire que la largeur L1 de cette première portion 431 mesurée suivant l'axe X augmente lorsque l'on se déplace vers la seconde extrémité 52. Cette première portion 431 de l'ouverture 43 comprend deux bords 44, 45 en vis-à- vis ménagés dans la paroi latérale 26. Un des bords 44 est incliné par rapport à la paroi de liaison 28 et le second bord 45 est également incliné dans la direction opposée par rapport à la direction d'inclinaison du premier bord 44 pour former l'évasement. En variante, un seul des deux bords 44, 45 est incliné pour former l'évasement. L'ouverture 43 comprend en outre une deuxième portion 432 s'étendant entre la première extrémité 51 et la première portion 431 . Cette deuxième portion 432 s'évase en s'élargissant vers la première extrémité 51 , c'est-à- dire que la largeur L2 de cette deuxième portion 432 mesurée suivant l'axe X augmente lorsque l'on se déplace vers la première extrémité 51 . Cette deuxième portion 432 permet de faciliter l'insertion et le centrage du bras 39 du ressort 36. As can be seen clearly in FIG. 3a, the side wall 26 has an opening 43 for the passage of the arm 39 of the spring 36. This side wall 26 has a length L 0, measured in a direction perpendicular to the X axis, between a first end 51 farthest from the manifold and a second end 52 closest to the manifold (located on the side opposite the arm 39 of the spring). The opening 43 comprises at least a first portion 431 between the two ends 51, 52 which widens widening towards the second end 52, that is to say that the width L1 of this first portion 431 measured next the X axis increases when moving towards the second end 52. This first portion 431 of the opening 43 comprises two edges 44, 45 vis-à-vis formed in the side wall 26. One of the edges 44 is inclined relative to the connecting wall 28 and the second edge 45 is also inclined in the opposite direction relative to the inclination direction of the first edge 44 to form the flare. Alternatively, only one of the two edges 44, 45 is inclined to form the flare. The opening 43 further comprises a second portion 432 extending between the first end 51 and the first portion 431. This second portion 432 widens widening toward the first end 51, that is to say that the width L2 of this second portion 432 measured along the X axis increases when moving towards the first end 51. This second portion 432 makes it easier to insert and center the arm 39 of the spring 36.
L'ouverture 43 comprend une troisième portion 433 s'étendant entre la seconde extrémité 52 et la première portion 431 . Cette troisième portion 433 s'évase en s'élargissant vers la première extrémité 51 , c'est-à-dire que la largeur L3 de cette troisième portion 433 mesurée suivant l'axe X augmente lorsque l'on se déplace vers la première extrémité 51 . Cette troisième portionThe opening 43 comprises a third portion 433 extending between the second end 52 and the first portion 431. This third portion 433 widens to widen towards the first end 51, that is to say that the width L3 of this third portion 433 measured along the X axis increases when moving towards the first end 51. This third portion
433 permet de faciliter l'insertion de la tresse 19 du balai 15 lors de son déplacement vers le collecteur dû à l'usure du balai 15. 433 facilitates the insertion of the braid 19 of the blade 15 during its movement towards the collector due to the wear of the blade 15.
L'ouverture 43 comprend une quatrième portion 434 s'étendant entre la seconde extrémité 52 et la troisième portion 433. Cette quatrième portionThe opening 43 comprises a fourth portion 434 extending between the second end 52 and the third portion 433. This fourth portion
434 est délimitée par des bords parallèles de la paroi 26. Autrement dit, cette quatrième portion 434 présente une largeur L4 mesurée suivant l'axe X sensiblement constante. Les bords de cette portion 434 séparent deux murets 55, 56 formant la paroi 26. Ces deux murets 55, 56 globalement en forme de L sont reliés entre eux par une ailette 57. 434 is delimited by parallel edges of the wall 26. In other words, this fourth portion 434 has a width L4 measured along the substantially constant axis X. The edges of this portion 434 separate two walls 55, 56 forming the wall 26. These two generally L-shaped walls 55, 56 are interconnected by a fin 57.
Afin d'augmenter la rigidité de la cage 13, l'ailette 57 comprend deux parties 571 , 572 s'étendant dans deux plans différents inclinés l'un par rapport à l'autre, comme cela est bien visible sur la figure 3c. Il est à noter que la quatrième portion 434 de l'ouverture 43 peut se prolonger dans une échancrure 58 ménagée dans l'ailette 57 pour autoriser le passage de la tresse 19 du balai 15 logé dans la cage 13 correspondante au plus proche du collecteur. Comme on peut le voir sur la figure 3b, l'autre paroi latérale 27 présente une ouverture 43' comportant une première portion 431 ' et une deuxième portion 432' ayant une configuration analogue respectivement à la première portion 431 et à la deuxième portion 432 de l'ouverture 43. Dans ce cas, les bords inclinés 44' et 45' ménagés dans la paroi 27 sont reliés entre eux par un bord 46' ayant une orientation parallèle à l'axe X. Autrement dit, la paroi latérale 27 est formée par deux murets qui sont reliés entre eux du côté du collecteur par une bande de matière s'étendant dans le plan de la paroi 27. En variante, un seul des deux bords 44' et 45' est incliné. Du côté de la face du balai 15 débouchant du côté du collecteur, une ailette 59 est issue d'un bord de la paroi 27 pour rigidifier mécaniquement la cage 13. In order to increase the rigidity of the cage 13, the fin 57 comprises two parts 571, 572 extending in two different planes inclined with respect to each other, as is clearly visible in FIG. 3c. It should be noted that the fourth portion 434 of the opening 43 can be extended in a notch 58 formed in the fin 57 to allow the passage of the braid 19 of the brush 15 housed in the corresponding cage 13 closest to the collector. As can be seen in FIG. 3b, the other side wall 27 has an opening 43 'having a first portion 431' and a second portion 432 'having a configuration similar to the first portion 431 and the second portion 432 respectively. In this case, the inclined edges 44 'and 45' formed in the wall 27 are interconnected by an edge 46 'having an orientation parallel to the axis X. In other words, the side wall 27 is formed by two walls which are interconnected on the collector side by a strip of material extending in the plane of the wall 27. Alternatively, only one of the two edges 44 'and 45' is inclined. On the side of the face of the brush 15 opening on the collector side, a fin 59 is derived from an edge of the wall 27 to mechanically stiffen the cage 13.
Comme cela est illustré sur la figure 1 , il sera possible de positionner la tresse 19 du balai 15 et le bras 39 du ressort 36 correspondant d'un même côté de la cage 13, pour les balais de polarité négative dont la tresse 19 est soudée sur la plaque 121 . La tresse 19 et le bras 39 sont en l'occurrence positionnés du côté de la paroi 26 qui comporte les portions ouvertes 431 , 432 autorisant le passage du bras 39 du ressort 36 ainsi que les portions ouvertes 433, 434 autorisant le passage de la tresse 19. Par ailleurs, pour les balais 15 de polarité positive ayant leur tresse 19 soudée sur l'interconnecteur 20, on positionne le bras 39 du ressort 36 et la tresse 19 respectivement de part et d'autre du balai 15. Dans ce cas, le ressort 36 est positionné du côté de la paroi 27, de manière que son bras 39 passe à travers les portions 431 ', 432' de l'ouverture 43'; tandis que la tresse 19 est positionnée du côté de la paroi 26 pour pouvoir passer en fin de course du ressort 36 par les portions ouvertes 433, 434 ainsi que par l'échancrure 58 de l'ailette 57 afin que la tresse 19 puisse se déplacer au plus près possible du collecteur pour maximiser le volume d'utilisation du balai 15. En variante, comme cela est représenté sur la figure 4, l'ouverture 43 de la paroi 26 est dépourvue de quatrième portion 434, la troisième portion 433 se prolongeant directement dans l'échancrure 58 réalisée dans l'ailette 57. Dans ce cas, l'ouverture 43 sépare deux murets 55, 56 en forme de L reliés entre eux par l'ailette 59. La paroi latérale 27 munie de son ouverture 43' et des deux portions correspondantes 431 ' et 432' est analogue à celle du mode de réalisation des figures 3a à 3c. As illustrated in FIG. 1, it will be possible to position the braid 19 of the blade 15 and the arm 39 of the corresponding spring 36 on the same side of the cage 13, for the brushes of negative polarity whose braid 19 is welded on the plate 121. The braid 19 and the arm 39 are in this case positioned on the side of the wall 26 which has the open portions 431, 432 allowing the passage of the arm 39 of the spring 36 and the open portions 433, 434 allowing the passage of the braid 19. Furthermore, for the brushes 15 of positive polarity having their braid 19 welded to the interconnector 20, the arm 39 of the spring 36 and the braid 19 are positioned respectively on either side of the blade 15. In this case, the spring 36 is positioned on the side of the wall 27, so that its arm 39 passes through the portions 431 ', 432' of the opening 43 '; while the braid 19 is positioned on the side of the wall 26 to be able to pass at the end of travel of the spring 36 by the open portions 433, 434 as well as by the notch 58 of the fin 57 so that the braid 19 can move as close as possible to the manifold to maximize the use volume of the blade 15. In a variant, as shown in FIG. 4, the opening 43 of the wall 26 is devoid of a fourth portion 434, the third portion 433 extending directly in the notch 58 made in the fin 57. In this case, the opening 43 separates two walls 55, 56 L-shaped interconnected by the fin 59. The side wall 27 provided with its opening 43 ' and two corresponding portions 431 'and 432' are similar to that of the embodiment of Figures 3a to 3c.
En variante, comme cela est représenté sur la figure 5, les deux parois 26, 27 sont symétriques et présentent des ouvertures 43 identiques ayant une première portion 431 , une deuxième portion 432, et une troisième portion 433 se prolongeant dans une échancrure 58 réalisée dans l'ailette correspondante 57, 59, comme dans le mode de réalisation de la figure 4. Alternatively, as shown in FIG. 5, the two walls 26, 27 are symmetrical and have identical openings 43 having a first portion 431, a second portion 432, and a third portion 433 extending into a notch 58 made in the corresponding fin 57, 59, as in the embodiment of FIG. 4.
Par ailleurs, le système de fixation à la platine 12 est formé par deux paires de jambes 61 , 62. Les jambes 61 , 62 de chaque paires sont issues de deux bords en vis-à-vis des parois d'extrémité 32, 33. Une jambe 61 de chaque paire est destinée à traverser la platine 12 de part en part via un trou 63 réalisé suivant son épaisseur (cf. figure 2). L'autre jambe 62 de chaque paire est en appui contre un côté du contour intérieur délimitant l'orifice 16. Comme cela est montré sur les figures 3a et 5, les jambes 61 , 62 de chaque paire sont destinées à être rabattues l'une vers l'autre contre la platine 12. Alternativement, le système de fixation 31 comporte au moins un rivet traversant la platine 12 et une paroi d'extrémité 32, 33 de la cage à balai 13. Chaque cage 13 pourra dans un exemple de réalisation être obtenue par pliage d'une plaquette de tôle mince de manière à former sensiblement un oméga dont les branches d'extrémité sont fixées sur la platine 12. Furthermore, the fixing system to the plate 12 is formed by two pairs of legs 61, 62. The legs 61, 62 of each pair are derived from two edges vis-à-vis the end walls 32, 33. A leg 61 of each pair is intended to pass through the plate 12 through a hole 63 made according to its thickness (see Figure 2). The other leg 62 of each pair bears against one side of the inner contour delimiting the orifice 16. As shown in FIGS. 3a and 5, the legs 61, 62 of each pair are intended to be folded towards each other against the plate 12. Alternatively, the fastening system 31 comprises at least one rivet passing through the plate 12 and an end wall 32, 33 of the broom cage 13. Each cage 13 may in an exemplary embodiment be obtained by folding a plate of thin sheet so as to form substantially an omega whose end branches are fixed on the plate 12.
De préférence, les trous 63 recevant les jambes 61 , 62 des cages 13 de polarité négative ainsi que les zones de la platine 12 en contact avec les cages 13 recevant les balais 15 de polarité négative ne sont pas isolés électriquement, en sorte qu'un contact électrique peut intervenir entre les cages 13 de polarité négative et la plaque 121 via les jambes 61 , 62. Ce contact n'est pas nuisible au fonctionnement du démarreur, dans la mesure où il participe à l'établissement du contact électrique entre les pièces destinées à être au même potentiel électrique, en l'occurrence le potentiel de masse dans cette application. Preferably, the holes 63 receiving the legs 61, 62 of the cages 13 of negative polarity and the areas of the plate 12 in contact with the cages 13 receiving the brushes 15 of negative polarity are not electrically isolated, so that a electrical contact can intervene between the cages 13 of negative polarity and the plate 121 via the legs 61, 62. This contact is not harmful to the operation of the starter, insofar as it participates in establishing the electrical contact between the parts intended to be at the same electrical potential, in this case the ground potential in this application.
Comme on peut le voir clairement sur les figures 6a à 6c, la partie enroulée 37 du ressort 36 est formée par une pluralité de spires 371 coaxiales autour d'un axe Y. Le bras 39 s'étend depuis une extrémité de la partie enroulée 37 montée autour de la patte 38. Le bras 39 est destiné à venir en appui contre la face arrière du balai 15 opposée à la face du balai 15 en appui contre les lames du collecteur. As can be seen clearly in FIGS. 6a-6c, the coiled portion 37 of the spring 36 is formed by a plurality of coaxial coils 371 about a Y axis. The arm 39 extends from one end of the coiled portion 37 mounted around the lug 38. The arm 39 is intended to bear against the rear face of the brush 15 opposite the face of the brush 15 bears against the blades of the collector.
Dans le mode de réalisation de la figure 6a, le bras 39 comprend une portion 391 dont la largeur L5 mesurée suivant l'axe Y est inférieure à la largeur L6 de la partie enroulée 37 mesurée suivant l'axe Y. Cette portion 391 est délimitée par deux décrochements 68 issus de la partie du bras 39 ayant une largeur identique à la largeur L6 de la partie enroulée 37 et s'étendant vers l'intérieur de la bande de matière du bras 39. In the embodiment of FIG. 6a, the arm 39 comprises a portion 391 whose width L5 measured along the Y axis is less than the width L6 of the wound portion 37 measured along the Y axis. This portion 391 is delimited. by two recesses 68 coming from the part of the arm 39 having a width identical to the width L6 of the wound portion 37 and extending towards the inside of the material band of the arm 39.
Cette portion 391 du bras 39 de largeur réduite est au minimum égale à la longueur de la portion du bras 39 traversant l'ouverture 43 de la paroi latérale 26 entre le début de course du ressort 36 et la fin de course du ressort 36. On précise ici que le début de course du ressort 36 correspond à la position du bras 39 du ressort 36 pour un balai 15 en début de vie ayant une longueur maximale, tandis que la fin de course du ressort 36 correspond à une position du bras 39 du ressort 36 pour un balai 15 en fin de vie ayant une longueur minimale. En l'occurrence, la portion 391 s'étend jusqu'à l'extrémité du bras 39 située dans la cage 13 qui est en appui contre le balai 15. This portion 391 of the arm 39 of reduced width is at least equal to the length of the portion of the arm 39 passing through the opening 43 of the side wall 26 between the start of travel of the spring 36 and the end of travel of the spring 36. specifies here that the start of travel of the spring 36 corresponds to the position of the arm 39 of the spring 36 for a blade 15 at the beginning of life having a maximum length, while the end of stroke of the spring 36 corresponds to a position of the arm 39 of the spring 36 for a broom 15 at the end of life having a minimum length. In this case, the portion 391 extends to the end of the arm 39 located in the cage 13 which bears against the blade 15.
Dans le mode de réalisation de la figure 6b, la portion 391 de largeur réduite est sensiblement égale à la longueur de la portion du bras 39 traversant l'ouverture 43 de la paroi latérale 26 entre le début et la fin de course du ressort 36. Dans ce cas, le bras 39 peut comporter une seconde portion 392 s'étendant entre la première portion 391 et l'extrémité du bras 39 située dans la cage 13. La largeur L7 de la seconde portion 392 est supérieure à la largeur L5 de la première portion 391 . En l'occurrence, bien que pouvant être différente, la largeur de la seconde portion 392 est égale à la largeur L6 de la partie enroulée 37. La portion 392 est délimitée à une de ses extrémités par les deux décrochements 68 et de l'autre côté par deux autres décrochements analogues 69 situés entre la première 391 et la deuxième 392 portions. Dans un exemple de réalisation particulier, la première portion 391 présente une largeur L5 comprise entre 4 et 8mm. La partie enroulée 37 présente une largeur L6 de plus de 1 mm par rapport à la largeur L5 de la première portion 391 . La bande métallique formant le ressort à spirales 36 présente une épaisseur comprise entre 0.25 et 0.7mm. Le diamètre de la partie enroulée 37 est de l'ordre de 10mm. Bien entendu, ces dimensions pourront varier en fonction de l'application. In the embodiment of FIG. 6b, the portion 391 of reduced width is substantially equal to the length of the portion of the arm 39 passing through the opening 43 of the side wall 26 between the beginning and end of travel of the spring 36. In this case, the arm 39 may comprise a second portion 392 extending between the first portion 391 and the end of the arm 39 located in the cage 13. The width L7 of the second portion 392 is greater than the width L5 of the first portion 391. In this case, although it may be different, the width of the second portion 392 is equal to the width L6 of the wound portion 37. The portion 392 is delimited at one end by the two recesses 68 and the other side by two other similar recesses 69 located between the first 391 and the second 392 portions. In a particular embodiment, the first portion 391 has a width L5 of between 4 and 8 mm. The wound portion 37 has a width L6 of more than 1 mm with respect to the width L5 of the first portion 391. The metal strip forming the spiral spring 36 has a thickness of between 0.25 and 0.7 mm. The diameter of the wound portion 37 is of the order of 10 mm. Of course, these dimensions may vary depending on the application.
Même si dans la plupart des cas, la partie enroulée 37 est plus large que la portion 391 du bras 39 traversant l'ouverture 43 afin de maximiser la puissance du ressort 36, dans certains modes de réalisation imposant des contraintes d'encombrement sévères, le bras 39 du ressort 36 présente une portion 391 ayant une largeur L5 supérieure à la largeur L6 de la partie enroulée 37, comme cela est illustré à la figure 6c. Une telle configuration permet au bras 39 de s'adapter à la zone d'appui avec le balai 15 tout en permettant au ressort 36 de présenter un volume réduit. Dans ce cas, les décrochements 68 s'étendent depuis la partie du bras 39 ayant la même largeur que la partie enroulée 37 vers l'extérieur de la bande de matière formant le ressort 36. En variante, l'extrémité du bras 39 du ressort 36 est en appui uniquement contre une partie de la face d'extrémité. Cette partie pourra correspondre par exemple au fond d'une rainure 75 permettant de faciliter le guidage du bras 39 du ressort 36 lors de son déplacement, comme cela est illustré sur la figure 1 . Although in most cases, the wound portion 37 is wider than the portion 391 of the arm 39 passing through the opening 43 to maximize the power of the spring 36, in some embodiments imposing severe space constraints, the arm 39 of the spring 36 has a portion 391 having a width L5 greater than the width L6 of the wound portion 37, as shown in Figure 6c. Such a configuration allows the arm 39 to adapt to the bearing area with the brush 15 while allowing the spring 36 to have a reduced volume. In this case, the recesses 68 extend from the part of the arm 39 having the same width as the wound portion 37 towards the outside of the material band forming the spring 36. Alternatively, the end of the arm 39 of the spring 36 is supported only against a portion of the end face. This part may correspond for example to the bottom of a groove 75 to facilitate guiding the arm 39 of the spring 36 during its displacement, as shown in Figure 1.
L'homme du métier pourra bien entendu modifier la configuration du porte- balais 10 précédemment décrit sans sortir du cadre de l'invention défini ci- après par les revendications. Those skilled in the art can of course modify the configuration of the brush holder 10 previously described without departing from the scope of the invention defined below by the claims.
Ainsi, en variante notamment, le porte-balais 10 comporte plus de quatre balais 15, chaque balai 15 pouvant par exemple être associé à un autre balai positionné du côté opposé de la platine 12. Thus, as a variant in particular, the brush holder 10 comprises more than four brushes 15, each brush 15 being for example associated with another brush positioned on the opposite side of the plate 12.
Le porte-balais 10 est ici un porte-balais de moteur électrique d'un démarreur de véhicule automobile. En variante, le porte-balais 10 pourrait également appartenir à un alternateur ou à un alterno-démarreur. The brush holder 10 is here an electric motor brush holder of a motor vehicle starter. Alternatively, the brush holder 10 could also belong to an alternator or an alternator-starter.

Claims

REVENDICATIONS
1 . Ensemble comportant une cage à balai (13) et un ressort à spirales (36), 1. Assembly comprising a broom cage (13) and a coil spring (36),
- ledit ressort à spirales (36) comprenant un axe (Y), une partie enroulée (37) autour dudit axe (Y) et un bras (39) s'étendant à partir d'une extrémité de ladite partie enroulée (37),  said coil spring (36) including an axis (Y), a coiled portion (37) about said axis (Y) and an arm (39) extending from an end of said coiled portion (37),
- ladite cage à balai (13) comprenant au moins une paroi latérale (26, 27) munie d'une ouverture (43) pour le passage dudit bras (39) à travers ladite paroi latérale (26, 27) en sorte qu'une extrémité dudit bras (39) puisse être en appui sur au moins une partie d'une face d'extrémité d'un balai (15), caractérisé en ce que ledit bras (39) comprend une première portion (391 ) dont la largeur (L5) mesurée suivant ledit axe (Y) est différente de la largeur (L6) de ladite partie enroulée (37) mesurée suivant ledit axe (Y) dudit ressort à spirales (36).  said broom cage (13) comprising at least one side wall (26, 27) provided with an opening (43) for the passage of said arm (39) through said side wall (26, 27) so that a end of said arm (39) can be supported on at least a portion of an end face of a blade (15), characterized in that said arm (39) comprises a first portion (391) whose width ( L5) measured along said axis (Y) is different from the width (L6) of said wound portion (37) measured along said axis (Y) of said coil spring (36).
2. Ensemble selon la revendication 1 , caractérisé en ce que ledit bras2. The assembly of claim 1, characterized in that said arm
(39) comprend une première portion (391 ) dont la largeur (L5) mesurée suivant ledit axe (Y) est inférieure à la largeur (L6) de ladite partie enroulée (37) mesurée suivant ledit axe (Y) dudit ressort (36). (39) comprises a first portion (391) whose width (L5) measured along said axis (Y) is less than the width (L6) of said wound portion (37) measured along said axis (Y) of said spring (36) .
3. Ensemble selon la revendication 1 ou 2, caractérisé en ce que la première portion (391 ) dudit bras (39) est au minimum la portion du bras traversant ladite ouverture (43) de ladite paroi latérale (26, 27) entre un début de course dudit ressort (36) et une fin de course dudit ressort (36). 3. An assembly according to claim 1 or 2, characterized in that the first portion (391) of said arm (39) is at least the portion of the arm passing through said opening (43) of said side wall (26, 27) between a start stroke of said spring (36) and a limit of said spring (36).
4. Ensemble selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ledit bras (39) comporte une seconde portion (392) s'étendant entre ladite première portion (391 ) et l'extrémité dudit bras (39) située dans ladite cage à balai (13) et en ce que la largeur (L7) de ladite seconde portion (392) est supérieure à la largeur (L5) de ladite première portion (391 ). 4. An assembly according to any one of claims 1 to 3, characterized in that said arm (39) comprises a second portion (392) extending between said first portion (391) and the end of said arm (39) located in said brush cage (13) and in that the width (L7) of said second portion (392) is greater than the width (L5) of said first portion (391).
5. Ensemble selon la revendication 4, caractérisé en ce que la largeur (L7) de ladite seconde portion (392) est égale à la largeur (L6) de ladite partie enroulée (37) dudit ressort (36). 5. The assembly of claim 4, characterized in that the width (L7) of said second portion (392) is equal to the width (L6) of said wound portion (37) of said spring (36).
6. Ensemble selon l'une quelconque des revendications 1 à 5, caractérisé en ce que ladite première portion (391 ) dudit bras (39) présente une largeur (L5) comprise entre 4 et 8mm. 6. An assembly according to any one of claims 1 to 5, characterized in that said first portion (391) of said arm (39) has a width (L5) of between 4 and 8mm.
7. Ensemble selon l'une quelconque des revendications 1 à 6, caractérisé en ce que ladite partie enroulée (37) présente une largeur (L6) de plus de 1 mm par rapport à la largeur (L5) de ladite première portion (391 ) dudit bras (39). 7. An assembly according to any one of claims 1 to 6, characterized in that said wound portion (37) has a width (L6) of more than 1 mm with respect to the width (L5) of said first portion (391) said arm (39).
8. Ensemble selon l'une quelconque des revendications 1 à 7, caractérisé en ce que ladite cage à balai (13) comprend une patte (38) s'étendant en dehors d'un logement (23) pour ledit balai (15), ladite partie enroulée (37) dudit ressort (36) étant montée autour de ladite patte (38). 8. An assembly according to any one of claims 1 to 7, characterized in that said brush cage (13) comprises a tab (38) extending outside a housing (23) for said blade (15), said wound portion (37) of said spring (36) being mounted around said tab (38).
9. Porte-balais (10) de moteur électrique comportant un ensemble tel que défini selon l'une quelconque des revendications précédentes. 9. Brush holder (10) for an electric motor comprising an assembly as defined in any one of the preceding claims.
10. Moteur électrique comportant un porte-balais (10) tel que défini selon la revendication 9. Electric motor comprising a brush holder (10) as defined in claim 9.
1 1 . Démarreur de véhicule automobile comportant un moteur électrique tel que défini selon la revendication 10. 1 1. Motor vehicle starter comprising an electric motor as defined in claim 10.
EP15818000.0A 2014-12-12 2015-12-10 Assembly comprising a brush cage and a spiral spring and corresponding brush holder, electric motor and motor vehicle starter Withdrawn EP3231046A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1462293A FR3030145B1 (en) 2014-12-12 2014-12-12 ASSEMBLY COMPRISING A BRUSH CAGE AND SPIRAL SPRING, BRUSH HOLDER, ELECTRIC MOTOR, AND CORRESPONDING MOTOR VEHICLE STARTER
PCT/FR2015/053425 WO2016092223A1 (en) 2014-12-12 2015-12-10 Assembly comprising a brush cage and a spiral spring and corresponding brush holder, electric motor and motor vehicle starter

Publications (1)

Publication Number Publication Date
EP3231046A1 true EP3231046A1 (en) 2017-10-18

Family

ID=52692813

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15818000.0A Withdrawn EP3231046A1 (en) 2014-12-12 2015-12-10 Assembly comprising a brush cage and a spiral spring and corresponding brush holder, electric motor and motor vehicle starter

Country Status (6)

Country Link
US (1) US10700485B2 (en)
EP (1) EP3231046A1 (en)
JP (1) JP2018503019A (en)
CN (1) CN107005011B (en)
FR (1) FR3030145B1 (en)
WO (1) WO2016092223A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3032840B1 (en) * 2015-02-13 2018-04-13 Valeo Equip Electr Moteur BRUSH HOLDER

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10256831A1 (en) * 2002-12-04 2004-06-24 Siemens Ag Carrier part for commutator brushes of an electric motor
US7141907B2 (en) * 2004-06-05 2006-11-28 Lg Electronics Inc. Bracket assembly of universal motor
DE102004041490A1 (en) * 2004-08-27 2006-03-02 Robert Bosch Gmbh Grinding holder
DE102007061745A1 (en) * 2007-12-20 2009-06-25 Robert Bosch Gmbh Holding element for a Kommutatorschleifkontakt an electric motor and electric motor
FR2996368B1 (en) * 2012-09-28 2015-11-13 Valeo Equip Electr Moteur ELECTRIC MACHINE BROOM AND CORRESPONDING BRUSH HOLDER
FR2996369B1 (en) * 2012-09-28 2016-06-03 Valeo Equip Electr Moteur A BROOM CAGE FOR AN ELECTRIC MACHINE BRUSH HOLDER AND A CORRESPONDING BRUSH HOLDER

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2016092223A1 *

Also Published As

Publication number Publication date
FR3030145B1 (en) 2016-12-09
CN107005011A (en) 2017-08-01
US20170331242A1 (en) 2017-11-16
WO2016092223A1 (en) 2016-06-16
CN107005011B (en) 2020-10-23
US10700485B2 (en) 2020-06-30
JP2018503019A (en) 2018-02-01
FR3030145A1 (en) 2016-06-17

Similar Documents

Publication Publication Date Title
EP3097630B1 (en) Brush holder for a motor vehicle starter provided with a thermal protection system and corresponding motor vehicle starter
EP3066750B1 (en) Brush holder of an electric machine for a vehicle and corresponding starter
EP2901527B1 (en) Brush of an electric machine and corresponding brush-holder
EP2901528A1 (en) Brush box for electric machine brush-holder and corresponding brush-holder
EP3231067B1 (en) Improved brush cage for motor vehicle starter, and corresponding brush holder, electric motor and motor vehicle starter
EP3231046A1 (en) Assembly comprising a brush cage and a spiral spring and corresponding brush holder, electric motor and motor vehicle starter
EP2748914A1 (en) Carbon brush earth circuit
WO2017013353A1 (en) Improved electric motor brush holder for a motor vehicle starter
FR3048733B1 (en) MOTOR VEHICLE STARTER PROVIDED WITH ENHANCED THERMAL PROTECTION
WO2016128650A2 (en) Brush holder
WO2016132035A1 (en) Spiral spring of a brush holder
FR3050884A1 (en) BRUSH DOOR ASSEMBLY FOR STARTER
FR3050880A1 (en) BRUSH DEVICE FOR STARTER
FR3054937A1 (en) STARTER WITH A BRUSH DOOR COMPRISING A SPRING
FR3032843A1 (en) ELECTRIC MOTOR BRUSH HOLDER
FR3055756B1 (en) ROTATING ELECTRICAL MACHINE COMPRISING A DEMONABLE ELECTRONIC ASSEMBLY
WO2016097549A1 (en) Assembly for a brush holder of an electric motor of a motor-vehicle starter
FR3030928A1 (en) ASSEMBLY FOR MOTOR VEHICLE MOTOR MOTOR ELECTRIC MOTOR BRUSH HOLDER
WO2017187052A1 (en) Brush holder device for a starter
EP3096417A1 (en) Assembly for electric motor brush-holder of motor vehicle starter

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20170612

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20190902

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20200715

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20201126