JP2010166758A - Brush unit of rotating electric machine and rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To downsize a brush unit, and to avoid electric short-circuit, thereby improving reliability, in the brush unit of a rotating electric machine such as an electric motor using a disk commutator. <P>SOLUTION: A connecting portion for a brush member 50 of a connecting conduction 110 for conduction and connection of brush member 50 to a terminal plate 70 is used as the opposite surface 50A of brush members adjacent in a circumferential direction, and a connecting portion for the terminal plate 70 of the connecting conductor 110 is used as brush holding portions 48 adjacent in the circumferential direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a brush device for a rotating electrical machine and a rotating electrical machine, and more particularly to a brush device for a rotating electrical machine using a disk commutator and the rotating electrical machine.

  As a power supply device for an electric motor, a brush device including a flat disk commutator that is attached to an end portion in the axial direction of the rotor and rotates integrally with the rotor, and a brush member that is fixedly arranged on the motor housing side and is in sliding contact with the disk commutator (For example, Patent Documents 1 and 2).

  In the above-described brush device, a plurality of positive electrode brush members and negative electrode brush members are alternately arranged on a synthetic resin brush holder on a circumference concentric with the center of the brush holder, and the positive electrode brush member serves as the brush holder. The attached positive electrode terminal plate is conductively connected by a lead wire, and the negative electrode brush member is conductively connected by a lead wire to the negative electrode terminal plate attached to the brush holder.

  In the case where the positive electrode brush member and the negative electrode brush member are made of a carbon sintered body, the positive electrode brush member or the negative electrode brush member is sintered in a form including an end portion of a lead wire that conductively connects the positive electrode or negative electrode brush member and the positive electrode or negative electrode terminal plate. Some have eliminated the welding of the brush member and the lead wire. Such a lead wire is called a pigtail and is electrically conductively connected to the positive or negative terminal plate by spot welding the tip to a positive or negative terminal plate.

JP 2003-324908 A JP 2004-304946 A

  In the conventional brush device, the positive electrode terminal plate and the negative electrode terminal plate are electrically insulated by being offset from each other in the radial direction and the axial direction in the radially outward position from the arrangement portion of the positive electrode brush member and the negative electrode brush member in the brush holder. Attached with a gap, the pigtail is drawn out from the radially outer circumferential surface of the positive and negative brush members and connected to the positive and negative terminal plates by spot welding, etc. ing.

  In the brush device having such a structure, the connection of the positive and negative brush members to the positive and negative terminal plates by the pigtail is arranged in the radial direction of the brush holder from the arrangement portion of the positive and negative brush members. It will be carried out in a form that extends. For this reason, the radial direction dimension of a brush apparatus becomes large and becomes a cause which obstructs size reduction of an electric motor.

  Further, in the conventional brush device described above, adjacent pigtails are not electrically isolated. For this reason, considering the deformation of the pigtail, it is difficult to obtain sufficient reliability for avoiding an electrical short circuit. On the other hand, in order to isolate adjacent pigtails with an electrically insulating member, it is necessary to incorporate another member for isolation or to form an isolation wall on the brush holder. This increases the number of man-hours and complicates the shape of the brush holder.

  SUMMARY OF THE INVENTION The problem to be solved by the present invention is that in a brush device of a rotating electrical machine such as an electric motor using a disk commutator, the brush device can be reduced in size and at the same time, reliability to avoid an electrical short circuit is improved. It is to be.

  A brush device for a rotating electrical machine according to the present invention is a brush device for a rotating electrical machine using a disk commutator, and is made of an electrical insulating material having a plurality of brush holding portions arranged at a predetermined interval on one circumference. Brush holders, a positive electrode brush member and a negative electrode brush member made of a conductive material, which are alternately arranged in each of the plurality of brush holding portions and are in sliding contact with the disk commutator, and a positive electrode made of a conductive material provided on the brush holder A terminal plate and a negative electrode terminal plate; and a positive electrode brush member and the positive electrode terminal plate; and a connection conductor that electrically connects the negative electrode brush member and the negative electrode terminal plate, and the connection conductor is connected to the positive electrode brush member. Is on the radially extending surface of the positive brush member and the positive terminal plate of the connecting conductor Is connected between the brush holding portions adjacent to each other in the circumferential direction, and the connection portion of the connection conductor to the negative electrode brush member is on the radially extending surface of the negative electrode brush member, and the negative electrode terminal plate of the connection conductor Is connected between the brush holding portions adjacent in the circumferential direction.

  In the brush device for a rotating electrical machine according to the present invention, preferably, the plurality of brush holding portions are arranged on a circumference concentric with a center of the brush holder, and the conductive connection portion between the connection conductor and the positive terminal plate. The conductive connection portion between the negative electrode terminal plate and the connection conductor is concentric with the center of the brush holder and is disposed on the circumference having the same radius as the circumferential arrangement of the brush holding portion.

  In the brush device for a rotating electrical machine according to the present invention, preferably, the positive electrode terminal plate and the negative electrode terminal plate are embedded in the brush holder in a form in which the conductive connection portion to which the connection conductor is connected is exposed to the outside. The terminal plate and the negative electrode terminal plate include a portion where one of them intersects the other in the radial direction of the brush holder with respect to the other, and there is a gap in the axial direction of the brush holder in the non-contact state at the intersecting portion. The conductive connection part of the positive electrode terminal plate and the negative electrode terminal plate is arranged on one virtual plane perpendicular to the central axis of the brush holder.

  The brush device for a rotating electrical machine according to the present invention is preferably a brush device for a 6-pole 6-brush type rotating electrical machine having three each of the positive brush member and the negative brush member.

  The rotating electrical machine according to the present invention includes the brush device according to the above-described invention.

  According to the brush device of the rotating electrical machine according to the present invention, the connection of the conductive connection between the positive and negative brush members and the positive and negative terminal plates by the connecting conductor is not in the radial direction of the brush holder, but in the brush holder. It will be performed in a form extending in the circumferential direction. For this reason, the radial direction dimension of a brush apparatus can be shortened compared with the case where a connection conductor is extended to the radial direction of a brush holder. Thereby, a brush apparatus can be reduced in size.

  In addition, since the connecting portion of the connecting conductor to the positive terminal plate and the negative terminal plate is located between the brush holding portions adjacent in the circumferential direction, the brush holding portion functions as a member that electrically isolates the adjacent connecting conductor. In addition, the reliability of avoiding an electrical short circuit is improved.

The half sectional view showing one embodiment which applied the brush device of the rotation electrical machinery by the present invention to the electric motor. The expanded sectional view along line II-II of FIG. The longitudinal cross-sectional view of the principal part of the brush apparatus of the rotary electric machine by this invention. The front view of the brush holder of the brush apparatus of the rotary electric machine by this invention. The front view which shows arrangement | positioning with the positive electrode terminal plate and negative electrode terminal plate of the brush apparatus of the rotary electric machine by this invention. FIG. The perspective view of the positive electrode terminal plate of the brush apparatus of the rotary electric machine by this invention. The perspective view of the negative electrode terminal plate of the brush apparatus of the rotary electric machine by this invention.

  Hereinafter, an embodiment in which a brush device for a rotating electrical machine according to the present invention is applied to an electric motor will be described with reference to FIGS.

  FIG. 1 shows the overall configuration of a starter motor M according to the first embodiment. The starter motor M includes a motor housing (housing) 16 fixed to an engine (not shown) of the vehicle, and a rotor 30 that is rotatably supported by the motor housing 16. The motor housing 16 includes a cylindrical yoke member 10 having a plurality of permanent magnets 18, a rear bracket 14 fixed to one opening peripheral edge portion 10 a of the yoke member 10, and having a power feeding portion E and a brush device 40, A front bracket 12 fixed to the other peripheral edge 10b of the yoke member 10;

  The rotor 30 includes a coil 28 that is electrically connected to the power feeding unit E via the brush device 40, and is disposed inside the motor housing 16 so as to face the permanent magnet 18. Therefore, when a current is supplied from the power supply unit E to the coil 28 via the brush device 40, the rotor 30 is excited. That is, when a current is supplied to the coil 28, a force is generated in the circumferential direction of the rotor 30, the rotor 30 rotates, and the engine is driven.

  The rotor 30 includes a rotor core 26, a disk commutator 32, and a rotor shaft 24 into which the rotor core 26 and the disk commutator 32 are press-fitted. One end 24 a of the rotor shaft 24 is inserted into the oilless metal 22 press-fitted into the rear bracket 14, and the other end 24 b of the rotor shaft 24 is inserted into the bearing 20 press-fitted into the front bracket 12. Is done.

  A rotor core 26 and a disk commutator 32 are press-fitted into the rotor shaft 24, and the rotor 30 is rotatably supported by the motor housing 16. A gear 24c is formed at the other end 24b of the rotor shaft 24, and meshes with an engine gear (not shown). Therefore, the engine is driven as the rotor 30 rotates.

  The rotor core 26 press-fitted into the rotor shaft 24 is formed by laminating a plurality of core plates made of a magnetic material, and has a T-shaped tooth portion 27. In the first embodiment, the rotor core 26 has 32 tooth portions 27 in order to improve rectification. However, in order to improve the rectification property, the rotor core 26 may have 25 to 35 teeth portions 27.

  The laminated rotor core 26 is covered with a coating material in order to ensure insulation. A coil 28 is wound around the teeth portion 27 of the rotor core 26 covered with the coating material, and the coil 28 is fixed to the rotor core 26 with the coating material. Therefore, there is no fear that the coils 28 are in contact with each other, and the insulation of the coil 28 is ensured. In addition, in order to improve the rectification property of the starting motor M, the coil 28 is wound around the tooth portion 27 of the rotor core 26 with a short-pitch winding.

  The disk commutator 32 press-fitted into the rotor shaft 24 rotates integrally with the rotor 30. The disk commutator 32 has a plurality of fan-shaped conductive portions 36, and the insulating base member 34 formed in a disk shape includes the conductive portions 36 formed in a fan shape and is insert-molded. The coil 28 is connected to the disk commutator 32 by fusing. For this reason, the disk commutator 32 is electrically connected to the coil 28 wound around the rotor core 26.

  The motor housing 16 includes a yoke member 10 that is formed in a cylindrical shape, a rear bracket 14 that is in-fitted with one opening peripheral portion 10 a of the yoke member 10, and a spigot fitting with the other opening peripheral portion 10 b of the yoke member 10. And a front bracket 12 to be used. The starting electric motor M is fixed to the engine by a bolt (not shown) or the like via a leg portion 14k formed on the rear bracket 14.

  The yoke member 10 is formed in a cylindrical shape from a magnetic material such as iron, and a plurality of permanent magnets 18 are alternately arranged on the yoke member 10 with magnetic poles. One opening peripheral portion 10a of the yoke member 10 is fitted in the rear bracket 14 with an inlay, and the other opening peripheral portion 10b of the yoke member 10 is fitted in the front bracket 12 with an inlay. Therefore, the opening peripheral portions 10a and 10b of the yoke member 10 are formed thin.

  Bolts 15 are inserted into the front bracket 12 that is inlay-fitted to the other opening peripheral edge portion 10 b of the yoke member 10. The bolt 15 is screwed into the bolt hole 122 formed in the rear bracket 14 via the yoke member 10. That is, the yoke member 10, the rear bracket 14, and the front bracket 12 are integrated by the bolt 15 to constitute the starting electric motor M. A rubber-made square ring 29 is disposed between one opening peripheral edge 10a of the yoke member 10 and the opening peripheral edge 14a of the rear bracket 14, and the other opening peripheral edge 10b of the yoke member 10 Between the opening peripheral edge portion 12a of the front bracket 12, a rubber square ring 29 is disposed. That is, the square ring 29 seals between the yoke member 10 and the rear bracket 14, and seals between the yoke member 10 and the front bracket 12. Therefore, water or the like does not enter the motor housing 16 from the outside.

  The front bracket 12 is formed in a bowl shape by aluminum die-casting, and fits in one piece with the opening peripheral edge portion 10 b of the yoke member 10. Therefore, the opening peripheral edge portion 12a of the front bracket 12 is formed thin. The front bracket 12 is formed with a cylindrical boss portion 12b, and an O-ring 25 is fixed to the boss portion 12b. Therefore, the starting electric motor M attached to the engine is sealed by the O-ring 25.

  A bearing 20 and an oil seal 21 are press-fitted into the front bracket 12. Therefore, engine oil does not enter the motor housing 16. The other end 24 b of the rotor shaft 24 of the rotor 30 is inserted into the bearing 20 press-fitted into the front bracket 12. Therefore, the rotor 30 is rotatably supported by the front bracket 12.

  The rear bracket 14 is formed in a bowl shape by aluminum die-casting, and is fitted with one opening peripheral edge portion 10a of the yoke member 10 in an inlay. Therefore, the opening peripheral edge portion 14a of the rear bracket 14 is formed thin. In the first embodiment, the rear bracket 14 is formed in a small size. Specifically, the outer diameter of the rear bracket 14 is set within a range of 602 mm to 68 mm.

  The rear bracket 14 includes a power feeding unit E that is electrically connected to the rotor 30 and a brush device 40. The power feeding unit E has a terminal bolt 100 fixed to the rear bracket 14, and the terminal bolt 100 is connected to an external power source (not shown). The brush device 40 includes a brush holder 42 and a plurality of brush accommodating portions 48 formed on the brush holder 42. The plurality of brush members 50 and 56 accommodated in the brush accommodating portion 48 are disc commutators. It is in sliding contact with 32 conductive portions 36.

  The power feeding unit E has a terminal bolt 100. The terminal bolt 100 is inserted into the through hole 106 formed in the rear bracket 14 through the brush device 40 from the inside of the rear bracket 14. A nut 108 is screwed into the terminal bolt 100 inserted into the through hole 106 from the outside of the rear bracket 14. Accordingly, the terminal bolt 100 is fixed to the rear bracket 14 by the nut 108.

  At the center of the rear bracket 14, a cylindrical boss portion 14b is formed to protrude, and an oilless metal 22 is press-fitted into the boss portion 14b. One end portion 24a of the rotor shaft 24 of the rotor 30 is inserted into the oilless metal 22 press-fitted into the boss portion 14b. That is, the rotor 30 is rotatably supported by the rear bracket 14.

  Details of the brush device 40 will be described with reference to FIGS. The brush device 40 includes an electrically insulating brush holder 42. The brush holder 42 is a synthetic resin molded product, and includes a cylindrical portion 44 fitted to the outer periphery of the rotor bearing boss portion 14 b of the rear bracket 14, and a flange projecting radially outward from the shaft end portion of the cylindrical portion 44. The part 46 is integrally formed. In other words, the cylindrical portion 44 is formed so as to protrude from the central portion of the flange portion 46. On the surface (flange surface) on the disk commutator 32 side of the flange portion 46, a plurality of, in this embodiment, six brush holding portions 48 are projectingly formed. The cylindrical portion 44 and the brush holding portion 48 protrude on the same side.

  The six brush holding portions 48 are concentric with the center C of the brush holder 42 around the cylindrical portion 44 on a surface on the disk commutator 32 side, that is, on one virtual plane orthogonal to the central axis of the brush holder 42. Arranged on one circumference A. The brush holding portions 48 are all in the same shape of a rectangular tube, and a part of the wall is provided by the cylindrical portion 44, and is arranged radially around the cylindrical portion 44, and the cylindrical outer wall is advanced in the clockwise direction. A slit opening 48 </ b> C that is long in the axial direction of the brush holder 42 is formed in the radial wall portion.

  Here, the center C of the brush holder 42 is concentric with the rotation center of the disk commutator 32, and the center axis of the brush holder 42 and the center axis of the disk commutator 32 are on the same axis. Hereinafter, the radial direction of the brush holder 42 means the same direction as the radial direction of the disk commutator 32.

  In the six brush holding portions 48, three positive brush members 50, 52, 54 and three negative brush members 56, 58, 60 are alternately arranged as viewed in the circumferential direction. Thereby, a 6 pole 6 brush type electric motor is constituted.

  The positive brush members 50, 52, 54 and negative brush members 56, 58, 60 have the same shape, are made of a carbon sintered molded product, etc., and are accommodated in the brush holder 48 so as to be movable in the axial direction. In this case, the compression coil spring 62 (see FIG. 3) disposed at the bottom of the brush holding portion 48 is urged toward the disk commutator 32, and the leading end surface thereof is in sliding contact with the conductive portion 36 of the disk commutator 32.

  A positive electrode terminal plate 70 and a negative electrode terminal plate 80 are embedded in the flange portion 44 of the brush holder 42. In the present embodiment, the brush holder 42 is configured as an insert-molded product that includes both the positive electrode terminal plate 70 and the negative electrode terminal plate 80 that are metal plate press-molded products as insert members.

  As shown in FIGS. 5 and 7, the positive electrode terminal plate 70 has narrow strip-like leg pieces 70B and 70C on both the left and right sides of the central portion 70A, and between the ends of the leg pieces 70B and 70C. Is substantially C-shaped in a plan view (projection plane in the axial direction of the brush holder 42). Conductive connection portions 72 and 74 extended in a substantially circular shape are formed at the tip portions of the leg piece portions 70B and 70C, respectively. The central portion 70A has a planar shape having a larger width than the leg piece portions 70B and 70C, and is formed through a through hole 76 into which the positive terminal bolt 100 for external connection (see FIG. 1) is inserted. ing.

  Stepped bent portions 70D and 70E are formed near the tip portions of the leg piece portions 70B and 70C, respectively, so that the leg piece portions 70B and 70C are stepped in the plate thickness direction by press bending. As a result, the leg pieces 70B and 70C have a difference in height in the plate thickness direction between the conductive connecting portions 72 and 74 and the central portion 70A, respectively, with the stepped bent portions 70D and 70E as boundaries. ing. On the conductive connection portions 72 and 74 side and the central portion 70A side, the conductive connection portions 72 and 74 are on the side having a high step. The height difference dimension Hp between the conductive connection portions 72 and 74 and the central portion 70A is set to a value larger than the plate thickness Tn of the negative terminal plate 80 (see FIG. 6).

  As shown well in FIGS. 5 and 8, the negative electrode terminal plate 80 has narrow strip-like leg pieces 80B and 80C on the left and right sides of the central portion 80A, and between the tips of the leg pieces 80B and 80C. Is substantially C-shaped in a plan view (projection plane in the axial direction of the brush holder 42). Conductive connection portions 82 and 84 extended in a substantially circular shape are formed at the tip portions of the leg piece portions 80B and 80C, respectively. The central portion 80A has a planar shape having a width larger than that of the leg pieces 70B and 70C, and is formed through a through hole 86 into which the negative terminal bolt 104 for external connection (see FIG. 2) is inserted. ing.

  Stepped bent portions 80D and 80E are formed near the distal ends of the leg piece portions 80B and 80C, respectively, so that the leg piece portions 80B and 80C are stepped in the plate thickness direction by press bending. As a result, the leg pieces 80B and 80C have a difference in height in the plate thickness direction between the conductive connecting portions 82 and 84 and the central portion 80A, respectively, with the step bent portions 80D and 80E as boundaries. In the conductive connection portions 82 and 84 side and the central portion 80A side, the conductive connection portions 82 and 84 side is a high step side. The height difference dimension Hn between the conductive connecting portions 82 and 84 and the central portion 80A is set to a value larger than the plate thickness Tp (see FIG. 6) of the positive terminal plate 70. In the present embodiment, there are further step bent portions 80F and 80G by press folding on both sides of the central portion 80A, and the central portion 80A is higher than the leg piece portions 80B and 80C in the thickness direction.

  The height difference dimension Hp of the leg piece portions 70B and 70C and the height difference dimension Hn of the leg piece portions 80B and 80C are set to be equal to each other.

  As described above, the positive electrode terminal plate 70 and the negative electrode terminal plate 80 are both substantially C-shaped in the axial projection plane of the brush holder 42, and as shown in FIG. The openings 70F and 80H are arranged to face each other. The positive electrode terminal plate 70 and the negative electrode terminal plate 80 include portions 130 and 132 that intersect with each other in the radial direction of the brush holder 42 on the C-shaped openings 70F and 80H side. The brush holder 42 has a three-dimensional arrangement in a non-contact state with a gap in the axial direction.

  In the present embodiment, the leg connecting portions 82 and 84 from the stepped portions 80D and 80E of the leg piece portions 80B and 80C of the negative electrode terminal plate 80, that is, the higher step side is the leg piece portion 70B of the positive electrode terminal plate 70, It extends from the radially outer side to the radially inner side above the center portion 80A side, that is, the lower side of the step, from the 70C step bent portions 70D and 70E. Due to this straddling, the conductive connecting portions 82 and 84 are located radially inward from the leg piece portions 70B and 70C. These straddling portions are intersecting portions 130 and 132, and as shown in FIG. 6, the lower stepped side of the leg piece portions 70B and 70C and the lower stepped side of the leg piece portions 80B and 80C have the same height. At the same position, assuming that the stepped side of the leg portions 70B and 70C and the stepped side of the leg piece portions 80B and 80C are at the same height position, the intersections are established by Hn> Tp and Hp> Tn. In the portions 130 and 132, gaps of Hn-Tp and Hp-Tn can be secured.

  As shown in FIG. 6, the step bent portions 80D and 80E of the leg piece portions 80B and 80C of the negative electrode terminal plate 80 are the step bent portions of the leg piece portions 70B and 70C of the positive electrode terminal plate 70, respectively. In order to avoid interference with the portions 70D and 70E, the shape projects outward in the radial direction.

  With the above-described configuration, the conductive connection portions 72 and 74 of the positive electrode terminal plate 70 and the conductive connection portions 82 and 84 of the negative electrode terminal plate 80 are respectively located between the two brush holding portions 48 adjacent in the circumferential direction, and the brush holder 42 are arranged on one imaginary plane orthogonal to the central axis of 42, that is, on the same plane, and the positive electrode side and the negative electrode side are alternately arranged to form an annular arrangement of six brush holding portions 48 Are arranged on a circumference A having the same radius and the same radius.

  In the brush holder 42 on the installation side of the brush holding portion 48, the portions corresponding to the conductive connection portions 72 and 74 of the positive electrode terminal plate 70 and the conductive connection portions 82 and 84 of the negative electrode terminal plate 80 are cut into a circular shape. Openings 90, 92, 94 and 96 are formed. Thereby, the conductive connection portions 72 and 74 of the positive electrode terminal plate 70 and the conductive connection portions 82 and 84 of the negative electrode terminal plate 80 are exposed to the outside of the brush holder 42, respectively.

  The portion of the brush holder 42 corresponding to the central portion 70A of the positive electrode terminal plate 70 on the installation side of the brush holding portion 48 can be fitted with the base plate-shaped conductive connection portion 102 formed by the head of the positive electrode terminal bolt 100. An opening 98 is formed, and the central portion 70 </ b> A of the positive electrode terminal plate 70 is exposed to the outside of the brush holder 42. The central portion 80A of the negative electrode terminal plate 80 is on the opposite side of the central portion 70A of the positive electrode terminal plate 70 with the center C therebetween, and the entire central portion 80A is exposed to the outside of the brush holder 42.

  The positive brush members 50, 52, 54 and the negative brush members 56, 58, 60 are each sintered and molded in such a manner that one end portions of connection conductors 110, 112, 114, 116, 118, 120 called pigtails are included therein. The connection conductors 110, 112, 114, 116, 118, 120 are electrically connected in advance to the positive brush members 50, 52, 54 and the negative brush members 56, 58, 60. Connection portions of the connection conductors 110, 112, 114, 116, 118, 120 and the positive brush members 50, 52, 54, and negative brush members 56, 58, 60 are on the radially extending surfaces of the brush members, and the connection conductors 110, 112, 114, 116, 118, 120 extend outward from the radially extending surfaces of the positive brush members 50, 52, 54 and negative brush members 56, 58, 60.

  The radially extending surfaces of the positive electrode brush members 50, 52, 54 and negative electrode brush members 56, 58, 60 are opposed surfaces of brush members adjacent in the circumferential direction, and are cubic positive electrodes arranged on the brush holding portion 48. Of the outer surfaces of the brush members 50, 52, 54 and negative electrode brush members 56, 58, 60, the outer surface of the brush extends in the radial direction of the brush holder 42. In FIG. 2, the radial extending surface (opposing surface) of the positive electrode brush member 50 is represented by reference numeral 50A as a representative example.

  Thereby, the connection of the conductive connection between the positive electrode brush members 50, 52, 54 and the negative electrode brush members 56, 60 and the positive electrode terminal plate 70, the negative electrode terminal plate 80 by the connection conductors 110, 112, 114, 116, 120 is performed in the circumferential direction. Between the brush holders 42 adjacent to each other without extending outwardly in the radial direction.

  The connecting conductors 110 and 114 of the positive brush members 50 and 54 extend in the circumferential direction of the brush holder 42 through the slit openings 48C of the brush holding portion 48 in the clockwise direction from the positive brush members 50 and 54, respectively. The conductive connection portions 72 and 74 of the positive terminal plate 70 are conductively connected by spot welding or the like.

  The connecting conductors 116 and 120 of the negative brush members 56 and 60 extend from the negative brush members 56 and 60 in the clockwise direction through the slit openings 48C of the brush holding portion 48 in the circumferential direction of the brush holder 42, respectively. The conductive connection portions 82 and 84 of the plate 80 are conductively connected by spot welding or the like.

  Further, the connection conductor 112 of the positive brush member 52 extends from the positive brush member 52 in the clockwise direction through the slit opening 48C of the brush holding portion 48 in the circumferential direction of the brush holder 42, and the tip penetrates the positive terminal plate 70. Conductive connection is made by spot welding or the like to the conductive connection portion 102 by the head of the positive terminal bolt 100 passed through the hole 76.

  The connecting conductor 118 of the negative electrode brush member 58 passes through the slit opening 48 </ b> C of the brush holding portion 48 in the clockwise direction from the negative electrode brush member 58 and then bends outward in the radial direction of the brush holder 42. It is conductively connected by spot welding or the like to the central portion 80A of the negative electrode terminal plate 80 extending in the circumferential direction and exposed to the outside.

  The positive terminal bolt 100 passed through the through hole 76 of the positive terminal plate 70 is tightened with a nut 108 at a portion that passes through the bolt through hole 106 of the rear bracket 14 and protrudes to the outside. 14 is fixed. A bolt 104 is passed through the through hole 86 of the negative terminal plate 80, and the bolt 104 is screw-engaged with a screw hole (not shown) of the rear bracket 14 to ground the negative terminal plate 80 to the rear bracket 14. ing.

  As described above, according to the brush device 40 of the present embodiment, with the exception of the connection conductor 118, the positive brush members 50, 52, 54 and the negative brush members 56, 60 are formed by the connection conductors 110, 112, 114, 116, 120. Since the connection of the conductive connection with the positive electrode terminal plate 70 and the negative electrode terminal plate 80 is performed in a form extending in the circumferential direction of the brush holder 42, compared with the case where the connection conductor extends in the radial direction of the brush holder. The radial dimension of the brush device 40 can be shortened. Thereby, the brush apparatus 40 can be reduced in size.

  Moreover, the connecting portions of the connecting conductors 110, 112, 114, 116, 120 to the positive terminal plate 70 and the negative terminal plate 80, in other words, the conductive connecting portions 72, 74, 102, 82, 84 are adjacent to each other in the circumferential direction. By being between the holding portions 48, the brush holding portion 48 functions as a member that electrically isolates connection conductors adjacent in the circumferential direction. Thereby, even if the connection conductors 110, 112, 114, 116, 120 are deformed, contact with other connection conductors is avoided, and the reliability of avoiding an electrical short circuit is improved.

  Although the connection conductor 118 includes a portion extending radially outward, the negative electrode terminal plate 80 is insert-molded in the brush holder 42, so that the position of the central portion 80A of the negative electrode terminal plate 80 to which the connection conductor 118 is connected. Can be displaced radially inward of the brush holder 42 from the conventional one in which the entire positive electrode terminal plate and negative electrode terminal plate are offset from each other in the axial direction of the brush holder 42 and arranged outside the brush holder, The connection conductor 118 does not hinder the radial dimension reduction of the brush device 40. If necessary, the connection between the connection conductor 118 and the negative terminal plate 80 may be performed at a portion between the brush holding portions 48 adjacent to each other in the circumferential direction, similarly to the connection conductor 116.

  Further, the brush device 40 of the present embodiment includes the intersecting portions 130 and 132 where the positive electrode terminal plate 70 and the negative electrode terminal plate 80 intersect in the radial direction of the brush holder 42, and the brush holder 42 at the intersecting portions 130 and 132. The three-dimensional arrangement in a non-contact state with a gap in the axial direction is embedded in a synthetic resin brush holder 42 by an insert molding method, so that the entire positive electrode terminal plate and negative electrode terminal plate are brush holders. The axial dimension of the brush device 40 can also be shortened as compared to the conventional one that is offset from each other in the axial direction of 42 and arranged outside the brush holder. Also by this, the brush apparatus 40 can be reduced in size.

  In addition, since the positive electrode terminal plate 70 and the negative electrode terminal plate 80 are three-dimensionally crossed in a non-contact state, they are embedded in the brush holder 42 by the insert molding method, so that electrical short-circuiting is achieved by the air three-dimensional arrangement of the lead wires. It is not necessary to take a structure to avoid, and the reliability of avoiding an electrical short circuit is improved.

  The positive electrode terminal plate 70 and the negative electrode terminal plate 80 are insert-molded in the brush holder 42, so that the assembly work of the positive electrode terminal plate 70 and the negative electrode terminal plate 80 with respect to the brush holder 42 can be omitted. An unreasonable assembly load does not act on the terminal plate 80, and deformation defects do not occur in the positive terminal plate 70 and the negative terminal plate 80.

  The conductive connection portions 72 and 74 of the positive electrode terminal plate 70 and the conductive connection portions 82 and 84 of the negative electrode terminal plate 80 are arranged on the same plane, and are concentric with the annular arrangement of the six brush holding portions 48. Since it is arranged on the circumference, it is easy to locate the connection conductors 110, 114, 116, 120 with respect to the conductive connection portions 72, 74, 82, 84 by spot welding or the like, and the connection workability is improved. .

  In addition, the conductive connection portions 72 and 74 of the positive electrode terminal plate 70 and the conductive connection portions 82 and 84 of the negative electrode terminal plate 80 are arranged on one circumference, so that they are radially displaced from each other. As compared with the case where the brush device 40 is also provided, the radial dimension of the brush device 40 can be shortened, and the brush device can be downsized.

  The brush device according to the present invention is not limited to a brush device for an electric motor, but can also be applied as a brush device for a current collector part of a generator or a brush device for a power supply / current collector part of a motor generator.

DESCRIPTION OF SYMBOLS 10 Yoke member 12 Front bracket 14 Rear bracket 16 Motor casing 18 Permanent magnet 24 Rotor shaft 26 Laminated core part 28 Winding part 30 Rotor 32 Disc commutator 34 Electrical insulating base member 36 Conductive part 38 Rotor bearing boss part 40 Brush Device 42 Brush holder 44 Cylindrical portion 46 Flange portion 48 Brush holding portion 48A Chamfered corner portion 48B Outer wall portion 50, 52, 54 Positive brush member 56, 58, 60 Negative brush member 62 Compression coil spring 70 Positive terminal plate 70A Central portion 70B, 70C Leg piece part 70D, 70E Step bending part 72, 74 Conduction connection part 76 Through hole 80 Negative electrode terminal plate 80A Center part 80B, 80C Leg piece part 70D, 70E Step bending part 82, 84 Conduction connection part 86 Through hole 90 , 92 , 94, 96, 98 Opening 100 Positive terminal bolt 102 Conductive connection 104 Negative terminal bolt 110, 112, 114, 116, 118, 120 Connecting conductor 130, 132 Intersection

Claims (5)

A brush holder made of an electrically insulating material having a plurality of brush holding portions arranged at a predetermined interval on one circumference;
A positive electrode brush member and a negative electrode brush member made of a conductor alternately disposed in each of the plurality of brush holding portions;
A positive electrode terminal plate and a negative electrode terminal plate made of a conductor provided in the brush holder;
The positive electrode brush member and the positive electrode terminal plate, the negative electrode brush member and the negative electrode terminal plate, each having a connection conductor for conducting connection,
The connection portion of the connection conductor to the positive brush member is on the opposite surface of the positive electrode brush member adjacent in the circumferential direction, and the connection portion of the connection conductor to the positive electrode terminal plate is between the brush holding portions adjacent in the circumferential direction. ,
The connection portion of the connection conductor with respect to the negative electrode brush member is on the opposing surface of the negative electrode brush member adjacent in the circumferential direction, and the connection portion of the connection conductor with respect to the negative electrode terminal plate is between the brush holding portions adjacent in the circumferential direction. The brush device of the rotating electrical machine in The plurality of brush holding portions are arranged on a circumference concentric with the center of the brush holder,
The conductive connection portion between the connection conductor and the positive electrode terminal plate and the conductive connection portion between the negative electrode terminal plate and the connection conductor are concentric with the center of the brush holder and have the same radius as the circumferential arrangement of the brush holding portion. The brush device for a rotating electrical machine according to claim 1, wherein the brush device is disposed on a circumference. The positive electrode terminal plate and the negative electrode terminal plate are embedded in the brush holder in a form in which the conductive connection portion to which the connection conductor is connected is exposed to the outside,
The positive electrode terminal plate and the negative electrode terminal plate include a portion in which one of the positive electrode terminal plate and the negative electrode terminal plate intersects the other in the radial direction of the brush holder, and has a gap in the axial direction of the brush holder at the intersecting portion. It is an arrangement of
3. The brush device for a rotating electrical machine according to claim 1, wherein the conductive connection portion between the positive electrode terminal plate and the negative electrode terminal plate is disposed on one virtual plane orthogonal to a central axis of the brush holder. .   4. The brush device for a rotating electrical machine according to claim 1, wherein the brush device is for a 6-pole 6-brush rotating electrical machine having three each of the positive brush member and the negative brush member. 5. .   The rotary electric machine which has a brush apparatus as described in any one of Claims 1-4.

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