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
  • H01R39/40—Brush holders enabling brush movement within holder during current collection
• • 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
  • H01R39/38—Brush holders
  • H01R39/383—Brush holders characterised by the electrical connection to the brush holder
• • 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
• • 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

Definitions

• the invention relates to a broom cage, also known as a case, for an electric machine brush holder and to the corresponding brush holder.
• the invention finds a particularly advantageous, but not exclusive application with the electrical machines used in motor vehicle starters.
• the invention is implemented with the starters used with vehicles equipped with the stop and restart function of the engine (function called "stop and start” in English) according to which the engine of the vehicle is stopped due to traffic conditions (especially during a stop at a red light) and then restarted to save fuel.
• the electric machine is provided with a stator, or inductor, consisting of a yoke and a magnetic structure with several permanent magnets generally made of ferrite.
• the machine also comprises a rotor, or armature, comprising conductors forming the rotor winding.
• the rotor comprising a core formed of laminated sheets has longitudinal notches separated by teeth, the conductors being threaded inside these notches.
• the machine also comprises at least two brushes made of electrically conductive material arranged inside the brush holder to allow the power supply of the rotor by switching the electric current in the conductors of the rotor.
• each blade has a body having a front face intended to rub against a collector with conductive blades connected to the rotor winding, these blades being separated by interstices filled with an insulator.
• Brushes also include a fastening area connected with one end of an electrically conductive member called a braid.
• a braid provides power to one of the brooms; while the other braid ensures a return to the mass of the other broom via a metal housing of the starter.
• a spring resting against a hood of the starter exerts on the body of each broom a force in the direction of the manifold to ensure contact between the blade and the blades of the collector.
• the invention aims to meet this need by providing a brush holder brush holder housing for an electric machine blade having a front face of the blade intended to bear against a manifold, a rear face of the blade against which is intended to come to bear a spring, and at least on one of these faces connecting the front face to the rear face, a space between the first and second guide portions to allow the passage of a braid of the blade to the l end of a front face.
• the broom cage allows the broom to wear to the braid.
• the broom can have a stop so that the braid does not
• INCORPORATED (E) BY REFERENCE (RULE 20.6) can not touch the manifold while allowing to increase the life of the brush by increasing the functional distance of the brush.
• the stop may be located so that the braid comes into contact with the stop when the braid is at a predetermined distance, for example 0.5mm of the collector.
• the broom cage serving as housing for an electric machine blade comprises a first guide portion of the blade and a second guide portion of the blade, these first and second guide portions being open on the side of a front face of the blade intended to to bear against a collector and the side of a rear face of the brush against which is intended to bear a spring, the brush cage comprising at least one space between the first portion and the second guide portion to allow the passage of a broom braid to the end of a front face.
• the space is located on a side face of the broom cage separating two side walls.
• the space is located on a transverse face of the broom cage separating two transverse walls.
• the first portion is a lower guiding portion formed by two parallel side walls between them and the second portion is an upper guide portion formed by two parallel side walls relative to each other, and in that that the two side walls are interconnected at least by a transverse wall.
• the brush cage comprises two spaces between the first and second guide portions to allow the passage of a braid of the blade to the end of a front face, on two opposite faces of these faces forming the outline of the first and second portions.
• the broom cage comprises two flaps interconnecting the first and second guide portions, each flap comprising a
• a dimension of the space between the first portion and the second guide portion tends to decrease when moving from the back to the front of the broom cage.
• the broom cage comprises a support (60) connected to one of the first and second portions and in that the support comprises at least one attachment system of the broom cage on a body of the brush holder.
• the fastening system comprises two hook branches folded towards each other at their end.
• the broom cage comprises at least one system for holding a spiral spring.
• the holding system is formed by a pin.
• the pin is of substantially rectangular section. In one embodiment, the pin has two portions of different sections defining a shoulder at a junction between the two parts.
• the holding system comprises three teeth, one of the teeth located between the two other teeth being positioned in a plane offset from the plane in which the other two teeth are located.
• the invention also relates to a brush holder for an electric machine characterized in that it comprises a body, at least one brush cage according to the invention fixed on said body, a broom positioned inside the cage to broom, a braid connected to the blade and a spring (42) mounted to exert a force between the blade and the body, the spring being in contact
• the blade has two bearing surfaces defined by the bottom of recesses formed on a rear face of the blade and in that the braid is connected to the brushes between these two recesses.
• the spring is spiral and has a U-shaped bent end and two sets of turns each coming from one of the U rods facing each other, each set of turns ending in a arm having a return intended to bear against one side of the broom.
• the spring is spiral and comprises a wound portion formed by a plurality of substantially concentric turns of a flat ribbon wound on itself, the wound portion terminating in a flat end extended by at least one arm intended for come to bear against one side of the broom.
• Figures 1a and 1b show views in perspective and from above of a first embodiment of a brush holder according to the invention
• Figures 2a and 2b show perspective and top views of the brush holder of Figures 1 when the blade is worn;
• Figure 3 shows a top view of two brushes used with a brush holder according to the invention having different functional distances;
• Figures 4a to 4c respectively show perspective views of the front and rear and a front view of a broom cage according to the invention;
• Figures 5a to 5c show respectively perspective views, from above and from the side, of a second embodiment of the brush holder according to the invention.
• Figure 6 shows a detail view of the spiral spring used in the first embodiment of the brush holder according to the invention
• Figure 7 shows a top view of another type of broom that can be used in combination with the broom cage according to the invention.
• FIGS. 1a, 1b, 2a, 2b and 5a to 5c show a brush holder 21 according to the invention comprising a body 22 and at least one case 23 fixed on the body 22 serving as a housing for a broom 25.
• the door broom can include in this case two brooms.
• a single broom or case 23 is visible.
• Each blade 25 is mounted to slide axially inside the brush cage 23 to cooperate with a manifold 27 of an electric machine rotor visible in FIG. 3.
• a spring 42 with spirals provided with arms tends to push the brushes 25 to contact blades 26 of the collector 27 carried by a collector body of electrically insulating material, such as plastic.
• the electric machine is for example the machine of a starter of a motor vehicle.
• the electric machine may also take the form of an alternator or an alternator-starter.
• the body 22 of the brush holder comprises a plate 28 made of an electrically conductive material and two parts 30 made of insulating material plated on both sides of the the plate 28.
• This body 22 has a central opening 32 (see Figure 5a) for the passage of the manifold 27.
• the body 22 has openings for its attachment for example by means of screws (not shown) on a cover of the starter.
• each blade 25 shown in detail in FIG. 3 comprises a body 34 of substantially parallelepipedal shape having a face 35, referred to as the front face, intended to rub against the contact blades 26 of the collector 27.
• a rear face 38 opposite to the front face 35 has two bearing surfaces 39 for a spring 42 for exerting a force on the body 34 towards the manifold 27.
• the spring 42 is a spiral spring with arms 74 or 82 intended to come into contact with the bearing surfaces 39 of the blade 25.
• the body 34 also includes a zone 44 for fixing with one end of an electrically conductive element called the connecting braid 45.
• the zone 44 for fixing the braid 45 is situated between the two bearing surfaces 39 on a lateral face of the body 34 perpendicular to the front 35 and rear 38.
• the two bearing surfaces 39 correspond to recess bottoms 50 formed on either side of the attachment zone 44.
• the attachment zone 44 is thus positioned on a protuberance delimited by the recesses 50 which have a V-shaped shape in the figure to facilitate guiding. spring arm 42.
• the zone 44 for fixing the braid 45 is located partly behind the bearing surfaces 39, the opposite side to the front face 35 of the blade 25. In other words, if delimits in a plan view the surface of the face of the brush 25 carrying the connection zone 44 in two spaces separated by the straight line passing through the bearing surfaces 39, at least a portion of the connection zone 44 is on the side of the space located on the side of the rear face 38.
• the zone 44 for fixing the braid 45 is located completely behind the bearing surfaces 39. In this case, the most small distance DS between the bearing surfaces 39 and the front face 35 of the blade 25 is equal to the functional distance DF of the blade 25. This distance DF corresponds to the smallest distance between the front face 35 and the end of the zone Fixing 44 closest to the front face 35.
• the braid 45 of one of the brushes 25 electrically connects this blade 25 to the hood here via a metal terminal 48 fixed to the plate 28 of the body 22 of the brush holder (see Figure 1a).
• the braid 45 is advantageously made of copper or copper alloy to facilitate welding on the lug 48. This braid thus ensures a return to ground via the metal housing of the starter.
• the brush cages 23 each comprise a lower portion 56 for guiding the blade connected to a support 60 and an upper portion 58 for guiding the blade.
• the lower guide portion 56 is formed by two side walls 561 parallel to each other connected to the support 60; while the upper guide portion 58 is formed by two parallel side walls 581 which are parallel to each other and are connected to each other by an upper wall 582.
• These portions 56 and 58 are open on the front face side 35 and the rear face 38 of the blade 25.
• the lower 56 and upper guide portions 58 are separated from each other by a space 61 to allow the passage of the braid of the blade 25.
• a dimension D1 of the space 61 between the portions 56 and 58 measured in a direction perpendicular to the top wall 582 tends to decrease when moving from the rear to the front of the broom cage 23.
• the edges of the side walls 561, 581 defining the space 61 have a ramp shape extending between two areas where the gap between the two portions 56, 58 is constant.
• the ramps of the edges of the lateral faces 561, 581 are symmetrical with respect to a horizontal median plane of the brush cage 23.
• the side walls 561, 581 have an L shape, as shown in FIGS. 1 a, 2a and 5a.
• each brush cage 23 has two flaps 57 interconnecting the lower portions 56 and upper 58 guide. These flaps 57 are located on the side of the front face 35 of the brush 25 along the vertical edges of the side walls 561, 581 of the portions 56 and 58. In FIGS. 4a to 4c, each flap 57 has
• Each flap 57 has an opening 571 located in the extension of the space 61 to allow movement of the braid of the brush 25 as close as possible to the manifold 27. This maximizes the length of use of the blade 25.
• each opening 571 extends in front view of the brush cage 23 in a direction perpendicular to the upper wall 582 and a direction perpendicular to the side faces 561, 581.
• the openings 571 here have a rectangular shape but could in variant have any other shape, such as an arcuate shape. It depends on the intended application.
• the support 60 is in two parts 601, 602 each connected to a lower edge of a lateral face 561 of the lower guide portion 56.
• Each part 601, 602 comprises a system 62 for attaching the brush cage 23 to the body 22 of the brush holder 21.
• Each fastening system 62 is formed by two hook branches 63 folded towards each other at the level of the brush holder. from their end. More precisely, as is clearly visible in FIG. 5c, the branches 63 coming from the front and rear edges of the support 60 pass through the body 22 according to its thickness and are folded towards one another at their end against the plate 28 of the body. In side view, the branches of the same fastening system 62 thus have a C shape, the recesses of the C of the two branches 63 being turned towards each other.
• each part 601, 602 of the support 60 comprises a system 67 for holding a spiral spring formed by a pin 77 of substantially rectangular cross section around which is positioned the spring 42 shown in detail in Figure 6.
• the pin 77 has two portions of different sections defining a shoulder at a junction between the two parts. An inner portion of the spring 42 can thus bear against the shoulder to ensure positioning
• the support 60 comprises a single holding system 67.
• the spring 42 has a coiled portion 80 formed by a plurality of substantially concentric turns of a flat metal tape wound on itself.
• the wound portion 80 terminates with a flat end 81 of ribbon.
• This flat end 81 is extended by two arms 82 parallel to each other intended to bear against the bearing surfaces 39 of the rear face of the blade. These arms 82 are each located in an extension of one of the edges of the flat end 81.
• Each arm 82 has a first straight portion 84 extending in the plane of the flat end 81 of the spring and a second straight portion 85 extending in a direction away from the wound portion 80.
• the straight portion 85 is connected to the portion 84 through a portion 91 folded rounded shape.
• the right portion 85 is also connected to a third straight portion 86 via a second portion 92 folded rounded shape.
• the straight portion 84 forms with the straight portion 85 an angle A of the order of 90 degrees; while the straight portion 86 forms with the straight portion 85 an angle B of the order of 135 degrees.
• Such a configuration of the arms 82 ensures a good bearing surface of the arms 82 of the spring against the rear face 38 of the blade 25 regardless of the state of wear of the blade 25. Indeed, as is clearly visible on 1b, when the blade 25 is not yet worn, the folded portion 92 ensures the contact of the arms 82 of the spring 42 against the rear face 38 of the blade 25. When the blade 25 is worn and the arms 82 are are moved in rotation (see Figure 2b), the right portion 86 ensures the contact of the arms 82 of the spring 42 against the rear face 38 of the blade 25.
• a portion of rectangular-shaped material is removed from the flat end of the ribbon so as to obtain straight parallel portions between them forming with the end of the ribbon a U-shape. These portions are then folded according to the desired arm shape 82.
• the system 67 for holding the spring 42 is formed by three teeth 68-70 between which
• the coil spring 42 is formed from a small diameter wire.
• the spring 42 has a U-shaped bent end 72 positioned between the teeth 68-70 of the system 67 and two sets 73 of turns each coming from one of the U-rods facing each other. one of the other.
• Each set 73 of turns positioned around the teeth 68-70 ends with an arm 74 having a return 75 visible in FIG. 5a intended to bear against a bearing surface 39 of the blade 25.
• the brush cage 23 is fixed to the body 22 of the brush holder by means of the fastening systems 62.
• the brush 25 is then positioned by the rear inside the brush cage 23.
• the spiral spring 42 is placed in position on the holding system 67 adapted so that the spring arms are positioned in abutment against the back of the blade 25.
• the wound portion 80 of the spring 42 is positioned around the pin 77 so that one end of the wound portion bears against the shoulder of the pin 77.
• the arms 82 of the spring 42 are moved in rotation to be positioned against the bearing surfaces 39 of the blade 25. Such movement of the arms 82 tends to deform the wound portion 80 maintained by the pin 77, so that the arms 82 bear against the rear face 38 of the blade 25 pushes the blade 25 towards the header 27.
• the end 72 of the U-shaped spring 42 is positioned between the teeth 68-70 of the feed system. retention
• the translation guide of the blade 25 is provided by the side walls 261, 281 of the lower 56 and upper portions 58 of the brush cage 23, the upper wall 582 of the upper portion 58, and by the face of the body 22 on which the blade 25 rests.
• the blade 25 rests against the bottom of a groove 65 formed in the upper face of the body 22.
• the skilled person may of course change the configurations of the brush cage 23 and the brush holder 21 shown in the figures without departing from the scope of the invention.
• the blade 25 has only one bearing surface 39 on its rear face 38, a single-arm spring can then be used.
• the blade 25 has a conventional parallelepipedal shape shown in Figure 7, the braid being fixed on a side face of the blade 25 as previously via the attachment zone 44.
• the configuration of the brush cage 23 will maximize the length used of this type of brush 25 without recess 50 to form the bearing surfaces 39.
• the coil spring 42 can be replaced by a cylindrical spring 42 'supported on a hood 98 to push the broom 21 against the blades 26 of the collector 27.
• the brush cage 23 has no flap 57, the side walls 561, 581 then being connected to one another on the side of the front face of the blade 25.
• the flaps 57 have no opening 571.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Motor Or Generator Current Collectors (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=47624242

Family Applications (1)

Country Status (7)

Families Citing this family (4)

Citations (4)

Family Cites Families (8)

• 2012
  • 2012-09-28 FR FR1259192A patent/FR2996369B1/fr active Active
• 2013
  • 2013-09-27 JP JP2015533676A patent/JP2015532572A/ja active Pending
  • 2013-09-27 CN CN201380051125.0A patent/CN104813547A/zh active Pending
  • 2013-09-27 EP EP13785502.9A patent/EP2901528A1/de not_active Withdrawn
  • 2013-09-27 US US14/427,922 patent/US9935415B2/en active Active
  • 2013-09-27 WO PCT/FR2013/052297 patent/WO2014049290A1/fr active Application Filing
  • 2013-11-26 KR KR1020157007652A patent/KR20160079727A/ko not_active Application Discontinuation

Patent Citations (4)

Non-Patent Citations (1)

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