JP2014023186A - Brush holder device and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a stable and rattle inhibiting effect on brushes while maintaining smooth movement of the brushes.SOLUTION: In a brush holder device 30, a guide pole 76 is arranged in a depressed portion of each of first brushes and a second brush 104, and the guide pole 76 and a first side wall 88A restrict movement of each of the first brushes and the second brush 104 in a width direction without pressing each brush. The guide pole 76 is formed integrally with a base plate 50 that is made of resin. The guide pole 76 is formed integrally with the base plate 50, for example by injection molding of a resin material. Thus, increase of the number of man-hours for machining a brush holder 88 is restricted, and the guide pole 76 is formed in a stable manner. Therefore, the brush holder device 30 achieves a stable rattle inhibiting effect on the brushes.

Description

  The present invention relates to a brush holder device and a motor.

  In the brush holder device described in Patent Document 1 below, a brush holder member (brush holder) is fixed to a holder base (base plate), and the brush holder member is bent into a substantially rectangular tube shape. A restraining portion is integrally formed on one of the pair of side walls of the brush holder member, and the restraining portion is bent into a substantially V shape when viewed from the axial direction of the holder base and protrudes toward the other side wall. ing.

  A brush is movably inserted into the brush holder member. On the side of the brush on the side of the restraining part, a step is formed corresponding to the restraining part. When viewed from the axial direction of the holder base, the width inside the holder base in the radial direction is the holder base in the brush. It is set smaller than the width dimension on the outside in the radial direction. And the suppression part is arrange | positioned in the level | step difference of a brush, and the shakiness of the brush width direction with respect to a brush holder member is suppressed by the other side wall and suppression part of a brush holder.

JP 2011-234437 A

  However, in this brush holder member, by pressing the sheet metal, the sheet metal is punched into a predetermined shape and bent to form the brush holder member. Therefore, the brush is formed by integrally forming the suppressing portion on the brush holder member. The number of man-hours for processing the holder member is increased, and the shape of the suppressing portion is not stabilized due to the spring back at the time of bending. As a result, the effect of suppressing the rattling in the width direction of the brush may vary. In addition, if the brush is pressed by the restraining portion in order to suppress the shakiness in the width direction of the brush, a sliding resistance is generated between the restraining portion and the brush, thereby preventing smooth brush movement. End up.

  In view of the above-described facts, an object of the present invention is to provide a brush holder device and a motor that can obtain a stable rattling suppression effect while maintaining smooth brush movement in the brush holder.

  The brush holder device according to claim 1 is made of resin, and is fixed to the base plate, and a base plate disposed radially outward with respect to a commutator fixed to a rotating shaft constituting a part of the motor. And a brush holder configured to include a first side wall and a second side wall disposed opposite to each other in the circumferential direction of the rotating shaft, and inserted between the first side wall and the second side wall, A brush that is held in the brush holder so as to be movable toward the child side, and has a stepped portion that is open to the commutator side on a side surface facing the second side wall, and is formed integrally with the base plate, And a suppressing portion that is disposed in the stepped portion and suppresses movement of the brush in the width direction with the first side wall.

  According to the brush holder device of the first aspect, the base plate disposed on the radially outer side with respect to the commutator fixed to the rotating shaft of the motor is provided, and the brush holder is fixed to the base plate. The brush holder includes a first side wall and a second side wall, and the first side wall and the second side wall are arranged to face each other in the circumferential direction of the rotation shaft. A brush is inserted between the first side wall and the second side wall, and the brush is held in a brush holder so as to be movable toward the commutator.

  And the level | step-difference part is formed in the side surface of the brush facing a 2nd side wall, and the level | step-difference part is open | released to the commutator side. Thereby, the width dimension of the radial inside part of the rotating shaft in the brush is set smaller than the width dimension of the radially outer part of the rotating shaft in the brush.

  Furthermore, the suppression part is arrange | positioned in the level | step-difference part, and the movement of the width direction of a brush is suppressed without pressurizing a brush by the suppression part and the 1st side wall. Thereby, rattling in the width direction of the brush with respect to the brush holder is suppressed while maintaining smooth brush movement in the brush holder.

  Here, the suppressing part is formed integrally with the base plate. That is, the suppression part is integrally formed not on the brush holder side but on the base plate side. Moreover, the base plate is made of resin. Thereby, for example, the suppressing portion can be formed integrally with the base plate by injection molding of resin. For this reason, compared with the case where a suppression part is formed in a brush holder, the increase in the processing man-hour of a brush holder can be suppressed and the shape of a suppression part can be formed stably. Therefore, in the brush holder device, it is possible to obtain a stable rattling suppression effect of the brush.

  The brush holder device according to claim 2 is the brush holder device according to claim 1, wherein the brush holder connects the first side wall and the second side wall, and a pigtail provided on the brush is inserted therethrough. A notch portion that is open to the commutator side and is spaced apart from the upper wall at the end portion of the commutator side of the second side wall. Is formed, and the suppression portion is disposed in the cutout portion.

  According to the brush holder device of the second aspect, the brush holder has the upper wall, and the first side wall and the second side wall are connected by the upper wall. An insertion portion is formed on the upper wall, and a pigtail provided on the brush is inserted into the insertion portion. This suppresses interference between the pigtail and the brush holder when the brush is moved to the commutator side.

  Here, a notch is formed at the end of the second side wall on the commutator side. This notch is open to the commutator side, and a suppressing part is disposed in the notch. Thereby, since the suppression part is arrange | positioned inside a brush holder, the enlargement in the radial direction of a brush holder apparatus can be suppressed. That is, if the restraining part is disposed outside the brush holder, the restraining part is disposed on the commutator side of the brush holder, so that the base plate becomes larger in the radial direction, and consequently the brush holder device becomes larger in the radial direction. .

  Moreover, the notch is disposed away from the upper wall. That is, the notch is not formed in the upper wall. Thereby, the intensity | strength of an upper wall can be made high. That is, if the notch is formed on the upper wall, the insertion portion and the notch are formed on the upper wall, so that the strength of the upper wall in the brush holder is reduced. On the other hand, since the notch is not formed in the upper wall, the strength of the upper wall can be increased compared with the above case, and the strength of the brush holder can be increased.

  The brush holder device according to claim 3 is the brush holder device according to claim 2, wherein the brush holder includes a bottom wall disposed to face the upper wall, and a length of the brush holder on the bottom wall. And a fixed portion for fixing the brush holder to the base plate, and the base plate has a contact portion provided so as to be able to contact the outer surface of the first side wall. .

  According to the brush holder device of the third aspect, the brush holder has the bottom wall, and the bottom wall is arranged to face the top wall. Further, fixed portions are formed at both ends in the longitudinal direction of the brush holder on the bottom wall, and the brush holder is fixed to the base plate by the fixed portions. Here, the base plate is provided with a contact portion, and the contact portion can be brought into contact with the outer side surface of the first side wall. For this reason, when fixing a brush holder to a base plate, a brush holder can be fixed to a base plate, making the 1st side wall contact | abut to a contact part. Thereby, the position of the brush holder in the circumferential direction of the base plate can be determined by the contact portion, and the positional relationship between the suppressing portion and the first side wall can be easily matched.

  The motor according to claim 4 is formed in a cylindrical shape, and includes a first housing that houses an armature including a commutator fixed to the rotating shaft, and is fixed and closed at an opening of the first housing. A brush holder device according to any one of claims 1 to 3, wherein the second housing, a permanent magnet provided on an inner peripheral surface of the first housing, and the brush holder device fixed to the second housing. I have.

  According to the motor according to claim 4, since the brush holder device according to any one of claims 1 to 3 is provided, the brush is maintained while maintaining smooth brush movement in the brush holder of the motor. The stable rattling suppression effect can be obtained.

It is a perspective view which shows the principal part of the brush holder apparatus which concerns on embodiment of this invention. It is sectional drawing which fractured | ruptured the principal part of the brush holder apparatus shown by FIG. 1 in the 2-2 line position of FIG. It is a front view showing the whole brush holder device concerning an embodiment of the invention. It is a perspective view of the brush holder apparatus shown by FIG. It is the perspective view which fractured | ruptured the brush holder apparatus shown by FIG. 3 in the 5-5 line position of FIG. (A) is the perspective view which fractured | ruptured the brush holder apparatus shown by FIG. 3 in the 6A-6A line position of FIG. 3, (B) is the brush holder apparatus shown by FIG. 3 by 6B-6B of FIG. It is the perspective view fractured | ruptured at the line position. (A) is the perspective view which fractured | ruptured the brush holder apparatus shown by FIG. 3 in the 7A-7A line position of FIG. 3, (B) is the brush holder apparatus shown by FIG. 3 7B-7B of FIG. It is the perspective view fractured | ruptured at the line position. (A) is the perspective view which fractured | ruptured the brush holder apparatus shown by FIG. 3 in the 8A-8A line position of FIG. 3, (B) is the brush holder apparatus shown by FIG. 3 8B-8B of FIG. It is the perspective view fractured | ruptured at the line position. It is a top view of the motor with a reduction gear in which the brush holder apparatus shown by FIG. 3 was used. FIG. 10 is a cross-sectional view (a cross-sectional view taken along line 10-10 in FIG. 9) in which the motor with a reduction gear shown in FIG.

  Hereinafter, a motor (wiper motor) 10 using a brush holder device 30 according to an embodiment of the present invention will be described with reference to the drawings, and then the brush holder device 30 will be described.

(About motor 10)

  FIG. 9 shows the motor 10 in a plan view, and FIG. 10 shows a sectional view in which the motor 10 is partially broken. As shown in these drawings, the motor 10 includes a motor main body 12 and a speed reduction unit 32 and is configured as a drive source for a vehicle wiper device (not shown).

  The motor body 12 includes a substantially bottomed cylindrical motor housing 14 as a first housing. As shown in FIG. 10, two pairs of permanent magnets 16 are fixed to the inner peripheral surface of the motor housing 14, and the permanent magnets 16 have different magnetic poles alternately along the circumferential direction of the motor housing 14. Are arranged at equal intervals (every 90 °) (a pair of opposed permanent magnets have the same magnetic pole and are arranged to have a different magnetic pole from the adjacent pair of permanent magnets). That is, the motor body 12 is configured as a four-pole motor.

  In the motor housing 14, an armature 18 is accommodated inside the permanent magnet 16, and the armature 18 includes a rotary shaft 20, an armature core 24, an armature coil 26, and a commutator 28. ing. The rotary shaft 20 is formed in a substantially round bar shape and is arranged coaxially with the motor housing 14. Then, one end portion in the axial direction of the rotating shaft 20 (the end portion on the arrow A direction in FIG. 10) is rotatably supported on the bottom portion of the motor housing 14 via a substantially cylindrical bearing 22. The other axial end portion (the end portion in the direction of arrow B in FIG. 10) of the rotary shaft 20 is disposed in a gear housing 34 as a second housing described later, and is rotatably supported by the gear housing 34. . Further, a worm portion (not shown) is integrally formed at a portion on the other axial end side of the rotating shaft 20, and a worm gear is formed on the outer periphery of the worm portion.

  The armature core 24 is fixed to the rotary shaft 20 and is disposed in the motor housing 14. The armature core 24 is formed by laminating a plurality of plate-shaped iron core plates having a plurality of teeth. The armature core 24 has a plurality of slots (18 slots in this example) at equal angular intervals. The armature core 26 is sequentially wound in multiple turns in each predetermined slot of the armature core 24 to form an armature coil 26. The Further, the rotary shaft 20 on the side opposite to the bearing 22 of the armature core 24 (the arrow B direction side in FIG. 10) has a plurality of commutator pieces 29 (in this example, the number of slots) arranged concentrically on the outer peripheral surface. A commutator 28 having the same 18) is fixed by press-fitting. Each commutator piece 29 of the commutator 28 is fixed by electrically insulating adjacent commutator pieces. Corresponding windings wound for each predetermined slot of the armature coil 26 are sequentially connected to each commutator piece. 29 is electrically connected.

  It should be noted that the armature 18 is not provided with a pressure equalizing line that connects commutator pieces that are equipotential.

  A holder housing portion 36 that is integrally formed with a gear housing 34 that will be described later as a second housing is fixed to the opening of the motor housing 14. The holder accommodating portion 36 has a substantially bottomed cylindrical shape in which one axial side of the rotating shaft 20 (arrow A direction side in FIG. 10) is opened, and closes the opening of the motor housing 14. An insertion hole 36A is formed in the bottom wall of the holder accommodating portion 36, and the rotary shaft 20 is inserted into the insertion hole 36A. A brush holder device 30 having a substantially annular shape is accommodated and supported in the holder accommodating portion 36. The brush holder device 30 is disposed on the radially outer side of the rotary shaft 20 with respect to the commutator 28, and the pair of first brushes 100 and 102 (see FIG. 3) and the pair of second brushes 104 of the brush holder device 30. 106 (refer to FIG. 3) are slidably contacted with the commutator 28 by a biasing force of a torsion spring 82 described later.

  On the other hand, the speed reduction part 32 includes a gear housing 34 as a second housing made of aluminum (or aluminum alloy). The gear housing 34 is formed in a substantially rectangular parallelepiped box shape that is partially opened, and is disposed on the other axial side of the rotating shaft 20 (the arrow B direction side in FIG. 10) than the motor housing 14. In the gear housing 34, the worm portion of the rotary shaft 20 described above is disposed. Further, a substantially disc-shaped worm wheel 38 (see FIG. 9) is accommodated in the gear housing 34 at the side of the worm portion, and the worm wheel 38 is orthogonal to the rotating shaft 20 of the motor main body 12. The direction of rotation (the direction of arrow C in FIG. 10) is supported so as to be rotatable. The outer peripheral portion of the worm wheel 38 is engaged with the worm portion of the rotary shaft 20. A substantially cylindrical output shaft 40 is provided at the axial center of the worm wheel 38, and the output shaft 40 extends from the worm wheel 38 to one side in the axial direction of the worm wheel 38 (in the direction of arrow C in FIG. 9). It protrudes and is drivingly connected to a pivot shaft (not shown) constituting a vehicle wiper device via a link mechanism or the like.

  Furthermore, a cover plate 42 made of an insulating resin material is provided on the opening side of the gear housing 34. The cover plate 42 is formed in a substantially rectangular parallelepiped box opened to the gear housing 34 side, and closes the opening of the gear housing 34. In the cover plate 42, a circuit board 44 constituting a circuit for driving and controlling the rotation of the motor body 12 is disposed. The circuit board 44 is connected to the motor body 12, specifically, first and second terminals 64 and 66 as motor terminals connected to the first and second brushes of each pair, and a connector 46 to which an external connector is connected. (See FIG. 9). Further, the circuit board 44 includes a PWM control circuit (not shown) for controlling the rotation speed of the motor body 12 by PWM control. Further, the circuit board 44 is supplied with the drive current of the motor main body 12 and the electric signal such as the sensor signal and the command signal from the external connector via the connector 46, and the drive control of the motor main body 12 according to the electric signal is performed. This is performed in the circuit of the circuit board 44. By performing drive control such as rotation speed and rotation direction of the motor body 12 and start / stop control, the wiper device of the vehicle is wiped and controlled. The reversing operation of the wiper device is executed by rotating the rotation direction of the rotation shaft 20 of the motor body 12 (that is, the rotation direction of the output shaft 40) forward and backward.

(About the brush holder device 30)

  3 is a front view of the brush holder device 30 as viewed from one axial side of the rotary shaft 20 (the arrow A direction side in FIG. 10). FIG. 4 is a perspective view of the brush holder device 30. It is shown in the figure.

  As shown in these drawings, the brush holder device 30 includes a base plate 50, four brush holders 88, a pair of first brushes 100 and 102 as brushes, and a pair of second brushes 104 as brushes. 106, a first wire 128 (see FIG. 3), and a second wire 130 (see FIG. 3). As shown in FIGS. 3 and 5, a holding portion 120 is formed on the base plate 50, and the first wire 128 and the second wire 130 are held in the holding portion 120. In addition, the 1st wire 128 and the 2nd wire 130 are comprised by the linear lead wire which has flexibility and a certain amount of rigidity (shape stability). Hereinafter, each configuration will be described.

  The base plate 50 is made of an insulating material (resin). As shown in FIG. 3, the base plate 50 has a substantially annular plate-like base portion 52 having a through hole 54 in the axial center. The base portion 52 is disposed coaxially with the rotary shaft 20, and the commutator 28 (see FIG. 10) described above is disposed in the through hole 54.

  On the outer peripheral portion of the base portion 52, a pair of assembling grooves 56 and 58 (elements grasped as "assembling portions" in a broad sense) for assembling rubber bushes 84 and 86 described later are formed. 3 (see FIG. 3), the assembly grooves 56 and 58 are substantially reversed when viewed from one side of the base portion 52 in the plate thickness direction (the direction of arrow A in FIG. 4) and radially outward of the base portion 52. It is formed in a C shape.

  In the assembly grooves 56 and 58, substantially cylindrical rubber bushes 84 and 86 are attached, respectively, and the rubber bushes 84 and 86 are arranged with the plate thickness direction of the base portion 52 as the axial direction. . A pair of flange portions 84A and 86A are integrally formed on the outer peripheral portions of the rubber bushes 84 and 86 at both ends in the axial direction, respectively, and the flange portions 84A and 86A are formed in a substantially annular shape to form rubber. The bushes 84 and 86 protrude outward in the radial direction. The base portion 52 is sandwiched between the flange portions 84A and 86A, whereby the rubber bushes 84 and 86 are assembled to the base portion 52 in a floating support state. Screws (not shown) are inserted into the rubber bushes 84 and 86, and the base portion 52 (brush holder device 30) is housed and fixed in the holder housing portion 36 of the gear housing 34 by the screws. Thereby, the brush holder apparatus 30 is being fixed to the gear housing 34 as a 2nd housing.

  The base portion 52 accommodates a pair of choke coils (not shown) for suppressing electric noise of the motor body 12 at a position opposite to the mounting grooves 56 and 58 with respect to the through hole 54. Coil accommodating portions 60A and 60B are formed. As shown in FIG. 4, the base portion 52 is integrally formed with a pair of terminal mounting portions 62 at the positions of the coil housing portions 60 </ b> A and 60 </ b> B. It protrudes from the thickness direction other side (arrow B direction of FIG. 4) of the base part 52 from. A first terminal 64 and a second terminal 66 as motor terminals of the motor body 12 are assembled to the terminal mounting portion 62, respectively. The first terminal 64 and the second terminal 66 are electrically connected to the circuit board 44. Connected.

  The base portion 52 is provided with a first connection fitting 68 on the side of the coil housing portion 60A. The first connection fitting 68 is electrically connected to the first terminal 64 via a choke coil. Yes. Further, the base portion 52 is provided with a second connection fitting 70 on the side of the coil housing portion 60B. The second connection fitting 70 is electrically connected to the second terminal 66 via a choke coil. Yes.

  In addition, four support shafts 72 for supporting a torsion spring 82 described later are formed in the base portion 52 in the vicinity of each brush holder 88 described later. The support shaft 72 is formed in a substantially cylindrical shape and protrudes from the base portion 52 to one side in the plate thickness direction of the base portion 52.

  Further, locking pieces 74 are formed on the outer peripheral portion of the base portion 52 at positions radially outside the base portion 52 with respect to the respective support shafts 72. The locking piece 74 is formed in a substantially plate shape, protrudes from the base portion 52 to one side in the plate thickness direction of the base portion 52, and on the outer periphery of the support shaft 72 when viewed from the plate thickness direction of the base portion 52. Is curved along. A protrusion 74A is integrally formed at the tip of the locking piece 74, and the protrusion 74A is located on one side in the circumferential direction of the base 52 from the locking piece 74 (in the direction of arrow E in FIGS. 3 and 4). It is protruded to.

  A torsion spring 82 is supported on each support shaft 72 of the base portion 52. One end portion of each torsion spring 82 is disposed between the protrusion 74A of the locking piece 74 and the base portion 52 and locked to the locking piece 74, and the other end portion of each torsion spring 82 is described later. The first brush 100 and 102 and the second brush 104 and 106 are locked.

  The brush holder 88 is made of a conductive sheet metal and is formed in a substantially rectangular tube shape with a partially opened side wall. The brush holder 88 is disposed on one side surface (surface on the arrow A direction side in FIG. 4) with the longitudinal direction being the radial direction of the base portion 52. In addition, the brush holder 88 is disposed on one side in the circumferential direction of the base portion 52 (counterclockwise side in FIG. 3) with respect to the support shaft 72, and at equal angular intervals (every 90 ° in the circumferential direction of the base portion 52). ).

  As shown in FIG. 5, the bottom wall 88D of the brush holder 88 is integrally formed with a pair of fixing claws 90 as a pair of fixed portions at both ends in the longitudinal direction. The fixing claws 90 extend from the bottom wall 88D of the brush holder 88 to the base portion 52 side, and are bent in directions facing each other on the other side surface (the surface on the arrow B direction side in FIG. 4) of the base portion 52. The base portion 52 is held between the pair of fixing claws 90, and thereby the brush holder 88 is fixed to the base portion 52.

  As shown in FIG. 1, a non-interference hole 92 is formed through the first side wall 88 </ b> A of the brush holder 88 (a side wall disposed on one side in the circumferential direction of the base portion 52) at a substantially central portion. The non-interference hole 92 is formed in a long hole shape along the longitudinal direction of the brush holder 88 (the radial direction of the rotating shaft 20). As shown in FIG. 5, a non-interference groove 94 is formed on the second side wall 88 </ b> B (side wall facing the first side wall 88 </ b> A) of the brush holder 88. The non-interference groove 94 is formed along the longitudinal direction of the brush holder 88 (the radial direction of the rotating shaft 20), and is opened to one side of the brush holder 88 in the longitudinal direction (the radially outer side of the base portion 52). Yes. Further, an insertion groove 96 as an insertion portion is formed in the upper wall 88C of the brush holder 88 (a wall facing the bottom wall 88D of the brush holder 88). The insertion groove 96 is formed along the longitudinal direction of the brush holder 88 (the radial direction of the rotating shaft 20), and is open to one side of the brush holder 88 in the longitudinal direction.

  Further, as shown in FIG. 1, a notch 98 is formed in the opening on the through hole 54 side of the brush holder 88. The notch 98 extends from the intermediate portion in the width direction of the bottom wall 88D of the brush holder 88 to the intermediate portion in the height direction of the second side wall 88B (plate thickness direction of the base portion 52), and is opened to the through hole 54 side. ing. In other words, the notch 98 is disposed away from the upper wall 88C.

  On the other hand, on the inner peripheral portion of the base portion 52 described above, a guide column 76 as a suppressing portion is formed at a position radially inward of the base portion 52 with respect to each support shaft 72. The cross section has a substantially pentagonal shape. The guide pillar 76 protrudes from the base portion 52 to one side (brush arrangement side) of the base portion 52 in the plate thickness direction, and extends to the front of the upper wall 88C of the brush holder 88 and is disposed in the notch 98. ing.

  Further, as shown in FIG. 2, the guide column 76 has a facing surface 76A. 76 A of opposing surfaces are arrange | positioned along the direction orthogonal to the circumferential direction of the base part 52, and are arrange | positioned in parallel and facing 1st side wall 88A. The guide column 76 has an inclined surface 76B. The inclined surface 76B is disposed on the radially outer side of the rotating shaft 20 of the facing surface 76A, and is inclined so as to be separated from the first side wall 88A toward the radially outer side of the rotating shaft 20.

  Further, as shown in FIG. 1, the above-described base portion 52 is in contact with the base portion 52 as a contact portion at a position on one side in the circumferential direction of the base portion 52 of the brush holder 88 (arrow E direction side in FIG. 1). A wall 78 is formed. The contact wall 78 is disposed in parallel with the first side wall 88 </ b> A of the brush holder 88, and the outer surface of the first side wall 88 </ b> A is in contact with the contact wall 78.

  As shown in FIGS. 3 and 4, the pair of first brushes 100 and 102 and the pair of second brushes 104 and 106 are formed in a substantially rectangular parallelepiped shape and are accommodated in a brush holder 88. The first brushes 100 and 102 and the paired second brushes 104 and 106 are arranged to face each other in the radial direction of the base portion 52 (at a mechanical angle of 180 degrees). The first brushes 100 and 102 and the second brushes 104 and 106 are inserted into the brush holder 88 so as to be slidable (movable) in the longitudinal direction of the brush holder 88.

  Next, the shapes of the first brushes 100 and 102 and the second brushes 104 and 106 will be described. Here, since the first brushes 100 and 102 and the second brushes 104 and 106 have the same shape, the second brush 104 shown in FIG. 2 will be described. The description of the two brushes 106 is omitted.

  A side surface of the second brush 104 facing the first side wall 88A of the brush holder 88 is disposed in parallel with the first side wall 88A. On the other hand, a stepped portion 104A is formed on the side surface of the second brush 104 facing the second side wall 88B of the brush holder 88. The step portion 104 </ b> A is formed over a predetermined length in the radial direction of the rotary shaft 20 from the end portion on the contact side with the commutator 28. That is, when viewed from the thickness direction of the base portion 52, the width dimension of the other end portion in the longitudinal direction of the second brush 104 (the radially inner end portion of the base portion 52) is equal to one end portion in the longitudinal direction of the second brush 104 (the base portion). It is set smaller than the width dimension of the radially outer end portion of the portion 52. In addition, the stepped portion 104A of the second brush 104 (sliding contact width dimension in the circumferential direction with the commutator 28) is set to a width dimension smaller than the circumferential width dimension of the commutator piece 29. Furthermore, the width dimension of the longitudinal end of the second brush 104 (the radially outer end of the base 52) is slightly smaller than the dimension between the first side wall 88A and the opposing surface 76A of the guide column 76. Is set to a small value. Further, in the present embodiment, the cross-sectional area of the stepwise section 104A in the longitudinal direction is uniformly formed.

  The other end of the torsion spring 82 is locked to one end in the longitudinal direction of the first brush 100, 102 and the second brush 104, 106, and the first brush 100, 102, and The second brushes 104 and 106 are urged radially inward of the base portion 52. Accordingly, the first brushes 100 and 102 and the second brushes 104 and 106 are moved from the position shown in FIG. 2 to the through hole 54 side (commutator 28 side), and the first brushes 100 and 102 and the second brushes are moved. The other longitudinal end portions of 104 and 106 protrude from the brush holder 88 toward the through hole 54 of the base portion 52 and are in contact with the commutator 28 described above. In this state, the guide pillar 76 is disposed in the stepped portions 100A to 106A, and the first brush 100, 102 and the second brush 104, between the guide pillar 76 (opposing surface 76A) and the first side wall 88A. Each of 106 is arranged. As a result, rattling of the first brushes 100 and 102 and the second brushes 104 and 106 in the width direction (the direction in which the first side wall 88A and the second side wall 88B face each other) is caused by the guide pillar 76 and the first side wall 88A. It is comprised so that it may be suppressed by. Further, in this state, the other end portion of the torsion spring 82 is arranged in the non-interference groove 94 and the non-interference hole 92 of the brush holder 88 so that interference between the two is suppressed.

  Further, as shown in FIGS. 3 and 4, the longitudinal ends of the first brushes 100, 102 and the second brushes 104, 106 (on the one end side in the longitudinal direction from the stepped portions 100A, 102A, 104A, 106A) One end of a pigtail 108 made of a round bar-like stranded wire or knitted wire, which has electrical conductivity and flexibility, is embedded in the portion where the width dimension is large. Each pigtail 108 extends from the first brush 100, 102 and the second brush 104, 106 to one side in the plate thickness direction of the base portion 52, and is movably inserted in the insertion groove 96 of the brush holder 88. Further, the pigtail 108 is curved at the middle portion in the longitudinal direction and is folded back to the other side of the base portion 52 in the plate thickness direction.

  The other end of the pigtail 108 provided on the first brush 100 is caulked and joined together by a first wire 128 and a choke coil (not shown), which will be described later, and a first connection fitting 68 as a caulking tool. . Further, the other end portion of the pigtail 108 provided on the first brush 102 is caulked and coupled together by a first wire 128 (described later) and a third connection fitting 110 as a caulking tool.

  Further, the other end portion of the pigtail 108 provided on the second brush 104 is caulked and coupled together by a second wire 130 and a choke coil (not shown) to be described later and a second connection fitting 70 as a caulking tool. . Further, the other end portion of the pigtail 108 provided on the second brush 106 is caulked and coupled together by a second wire 130 described later and a fourth connection fitting 112 as a caulking tool.

  Next, the holding unit 120, the first wire 128, and the second wire 130 will be described. As shown in FIGS. 3 and 5, the holding part 120 is configured to include a first groove part 122 and a second groove part 124. The first groove portion 122 and the second groove portion 124 are formed in the base portion 52 and open to one side of the base portion 52 in the plate thickness direction. The groove width of the first groove portion 122 is set slightly larger than the wire diameter of the first wire 128 described later, and the groove width of the second groove portion 124 is the wire diameter of the second wire 130 described later. It is set slightly larger than

  As shown in FIG. 3, the first groove portion 122 is seen from one side in the plate thickness direction of the base portion 52, from the side of the coil housing portion 60 </ b> A to one side in the circumferential direction of the base portion 52 (in the direction of arrow E in FIG. 3). And extends between the brush holder 88 for the first brush 102 and the rubber bush 86. Specifically, the proximal end portion of the first groove portion 122 is disposed on the side of the coil housing portion 60A, and the first groove portion 122 is directed from the proximal end portion to the brush holder 88 for the second brush 106. And extends below the brush holder 88 (the other side in the plate thickness direction of the base portion 52) at an intermediate position in the longitudinal direction of the brush holder 88. The first groove portion 122 that has passed through the lower side of the brush holder 88 for the second brush 106 further extends toward the brush holder 88 for the first brush 102, and is between the assembly groove 56 and the through hole 54. , And passes under the brush holder 88 at a longitudinal intermediate position of the brush holder 88 for the first brush 102 and extends between the brush holder 88 and the rubber bush 86.

  The first wire 128 is accommodated in the first groove portion 122. The first wire 128 is formed by bending a substantially round bar-shaped wire having conductivity and flexibility, and extends along the extending direction of the first groove 122. Accordingly, a part of the first wire 128 is disposed below the brush holder 88 for the second brush 106 (between the brush holder 88 and the base portion 52). A part is disposed below the brush holder 88 for the first brush 102 (between the brush holder 88 and the base portion 52).

  Then, one end in the longitudinal direction of the first wire 128 is bent toward one side in the plate thickness direction of the base portion 52, and is caulked together by the pigtail 108 provided on the first brush 102 and the third connection fitting 110 and coupled. ing. On the other hand, the other end portion in the longitudinal direction of the first wire 128 is bent toward one side in the plate thickness direction of the base portion 52, and the pigtail 108 and the choke coil (not shown) provided on the first brush 100 and the first connection fitting. At 68, they are crimped together. As a result, the first brushes 100 and 102 forming a pair are electrically connected by the first wire 128.

  On the other hand, the second groove portion 124 extends from the side of the coil housing portion 60B to the other circumferential side of the base portion 52 (the arrow F direction side in FIG. 3) when viewed from one side in the plate thickness direction of the base portion 52. It extends between the rubber bush 84 and the brush holder 88 for the second brush 106. Specifically, the base end portion of the second groove portion 124 is disposed on the side of the coil housing portion 60B, and the second groove portion 124 faces the brush holder 88 for the second brush 104 from the base end portion. And extends below the brush holder 88 (the other side in the plate thickness direction of the base portion 52) at an intermediate position in the longitudinal direction of the brush holder 88. The second groove 124 that has passed through the lower side of the brush holder 88 for the second brush 104 further extends toward the brush holder 88 for the first brush 102, and is between the assembly groove 58 and the through hole 54. And the lower side of the brush holder 88 for the first brush 102 passes at a position radially inward of the base portion 52 relative to the first groove portion 122. Further, the second groove portion 124 that has passed through the lower side of the brush holder 88 for the first brush 102 further extends toward the brush holder 88 for the second brush 106, and is between the assembly groove 56 and the through hole 54. And extends between the rubber bush 84 and the brush holder 88 for the second brush 106.

  The second wire 130 is accommodated in the second groove portion 124. The second wire 130 is formed by bending a substantially round bar-shaped wire having conductivity and flexibility, and extends along the extending direction of the second groove portion 124. Accordingly, a part of the second wire 130 is disposed below the brush holder 88 for the second brush 104 (between the brush holder 88 and the base portion 52), and other parts of the second wire 130 are arranged. A part is disposed below the brush holder 88 for the first brush 102 (between the brush holder 88 and the base portion 52).

  Then, one end in the longitudinal direction of the second wire 130 is bent toward one side in the plate thickness direction of the base portion 52, and the pigtail 108 and the choke coil (not shown) provided on the second brush 104 and the second connection fitting 70. They are crimped together and combined. On the other hand, the other end portion in the longitudinal direction of the second wire 130 is bent to one side in the plate thickness direction of the base portion 52, and is caulked together by the pigtail 108 provided on the second brush 106 and the fourth connection fitting 112. Has been. As a result, the second brushes 104 and 106 forming a pair are electrically connected by the second wire 130.

  Here, as viewed from one side in the plate thickness direction of the base portion 52, a portion where the first groove portion 122 and the second groove portion 124 intersect in the holding portion 120 is an intersection portion 126 (see FIG. 6B). A part of the second wire 130 intersects a part of the first wire 128 at the position of the intersection 126. At the intersecting portion 126, the first wire 128 and the second wire 130 are spaced apart from each other in the thickness direction of the base portion 52. That is, at the intersection 126, the first wire 128 and the second wire 130 are held in an electrically insulated state without contacting each other.

  This will be described with reference to FIGS. 6 (A) to 8 (B). 6A shows a cross section of the base portion 52 at the position of the line 6A-6A in FIG. 3, and FIGS. 6B to 8B show from the state of FIG. 6A. A cross section of the base portion 52 when the break position is gradually shifted to one side in the circumferential direction of the base portion 52 is shown.

  As shown in FIG. 6A, the second groove portion 124 is disposed on the radially outer side of the base portion 52 with respect to the first groove portion 122 at a position on the other circumferential side of the base portion 52 with respect to the intersecting portion 126. At the same time, it is disposed on the upper side of the first groove part 122 (one side in the plate thickness direction of the base part 52). That is, at this position, the second groove portion 124 and the first groove portion 122 are independently formed as separate grooves. Further, the second groove portion 124 is disposed below the flange portion 84 </ b> A of the rubber bush 84. That is, the second wire 130 passes below the flange portion 84 </ b> A, and the rubber bush 84 prevents the second wire 130 from coming out of the second groove portion 124.

  6B, the second groove 124 and the first groove 122 communicate with each other in the thickness direction of the base 52 at the position of the intersection 126. However, at the position of the intersection 126, the second wire 130 is disposed above the first wire 128, and the first wire 128 and the second wire 130 are electrically insulated from each other in the thickness direction of the base portion 52. Arranged in a state.

  Further, as shown in FIG. 7A, the second groove portion 124 is radially inward of the base portion 52 with respect to the first groove portion 122 at a position on one side in the circumferential direction of the base portion 52 relative to the intersecting portion 126. And at the upper side of the first groove 122. That is, at this position, the second groove portion 124 and the first groove portion 122 are independently formed as separate grooves separated in both the plate thickness direction and the radial direction of the base portion 52. As described above, the first groove portion 122 and the second groove portion 124 extend from the portions of the intersecting portion 126 having different groove depths to one side and the other side in the circumferential direction of the base portion 52, respectively.

  Further, as shown in FIGS. 7B to 8B, the groove depth of the first groove portion 122 gradually increases as the first groove portion 122 approaches the brush holder 88 for the first brush 102. The first wire 128 is held shallowly by the first groove portion 122 and the bottom wall 88D of the brush holder 88 below the brush holder 88. On the other hand, as the second groove portion 124 approaches the brush holder 88 for the first brush 102, the groove depth of the second groove portion 124 is gradually increased, and the second wire 130 is formed below the brush holder 88. Is separated from the bottom wall 88D of the brush holder 88. That is, the first wire 128 and the second wire 130 passing under the brush holder 88 are the same electrode (more specifically, when connected to the pigtail of the brush held by the brush holder 88) The groove depths of the first groove portion 122 and the second groove portion 124 are set so as to be in contact with the brush holder 88 and separated from the brush holder 88 which is a different electrode.

  Therefore, the groove depth of the second groove portion 124 is set to a depth at which the second wire 130 and the brush holder 88 are brought into contact with each other below the brush holder 88 for the second brush 104. On the other hand, the groove depth of the first groove portion 122 is set to a depth at which the first wire 128 and the brush holder 88 are separated from each other below the brush holder 88 for the second brush 106.

  Further, as shown in FIG. 5, the second groove portion 124 is disposed below the flange portion 86 </ b> A of the rubber bush 86. That is, the second wire 130 passes under the flange portion 86 </ b> A, and the second wire 130 is prevented from coming out of the second groove portion 124 even by the rubber bush 86.

  Further, as shown in FIG. 6B, the hook portion 132 is integrally formed in the first groove portion 122 at the position of the intersecting portion 126. The hook portion 132 is formed in a substantially trapezoidal cross section, and protrudes from one side wall of the first groove portion 122 toward the other side wall at a position above the first wire 128. Thereby, the upward movement of the first wire 128 is restricted by the hook portion 132, and the contact between the first wire 128 and the second wire 130 is prevented. The first wire 128 and the second wire 130 are wires coated with an insulating film, and the film is removed and electrically connected at the connection portion. However, if reliable insulation can be ensured, tin plating is performed. A copper wire or the like may be used.

  Next, the operation and effect of the present embodiment will be described.

  In the brush holder device 30 of the motor 10 configured as described above, the pair of first brushes 100 and 102 and the pair of second brushes 104 and 106 are arranged to face each other in the radial direction of the base plate 50. The pair of first brushes 100 and 102 are electrically connected by a first wire 128, and the pair of second brushes 104 and 106 are electrically connected by a second wire 130. The paired second brushes 104 and 106 have different polarities from the paired first brushes 100 and 102 when energized.

  A drive current is supplied to the pair of first brushes 100 and 102 and the pair of second brushes 104 and 106 via the connector 46, the circuit board 44, and the first terminal 64 and the second terminal 66 as motor terminals, respectively. Thus, the motor body 12 is driven to rotate. The rotational drive of the motor body 12 is controlled in accordance with an electrical signal such as a sensor signal or a command signal input to the circuit of the circuit board 44 via the connector 46 to which an external connector is connected. Drive control such as rotation direction, start / stop, etc. is performed. By controlling the rotation drive of the motor body 12, the wiper device of the vehicle is wiped and controlled. In the reversing operation of the wiper device, the rotational position of the output shaft 40 is detected by a rotational position detector (not shown) (for example, a magnetoresistive element), and the paired first brushes 100 and 102 are paired at the timing of the reversing position. By switching and controlling the polarity of the second brushes 104 and 106, the rotation direction of the rotating shaft 20 of the motor body 12 (that is, the rotating direction of the output shaft 40) is rotated forward and backward. In addition, some 4-pole wiper motors can be driven at two speeds, high speed and low speed, by forming a different magnetic circuit by supplying drive current to a high speed brush or a low speed brush. In the embodiment, the rotational speed of the motor body 12 is controlled by PWM control instead of switching the brush to be used by a PWM control circuit (not shown) provided in the circuit board 44.

  Further, each of the first brushes 100 and 102 and the second brushes 104 and 106 described above is inserted into a brush holder 88 fixed to the base plate 50 and held so as to be movable in the radial direction of the rotary shaft 20. .

  Step portions 100A to 106A are formed on the side surfaces of the first brushes 100 and 102 and the second brushes 104 and 106 facing the second side wall 88B of the brush holder 88, respectively. Guide columns 76 are arranged in the stepped portions 100A to 106A, and the first brushes 100 and 102 and the second brushes 104 and 106 are moved in the width direction by the guide columns 76 and the first side walls 88A. 106 is suppressed without pressurizing. Thereby, the width direction of the first brush 100, 102 and the second brush 104, 106 with respect to the brush holder 88 (the first side wall 88A and the second side wall 88B are opposed to each other while maintaining smooth brush movement in the brush holder 88). (In the direction of movement) is suppressed.

  Here, the guide pillar 76 is formed integrally with the base plate 50. That is, the guide column 76 is integrally formed on the base plate 50 side, not on the brush holder 88 side. Moreover, the base plate 50 is made of resin. Thereby, for example, the guide column 76 can be formed integrally with the base plate 50 by injection molding of a resin material. For this reason, compared with the case where the suppressing part which suppresses the shakiness of the width direction of the 1st brush 100,102 and the 2nd brush 104,106 with respect to the brush holder 88 is integrally formed in the brush holder 88, the brush holder 88 The increase in the number of processing steps can be suppressed, and the clearance in the width direction between the guide column 76 and the brushes 100 to 106 can be formed in a stable shape that is suppressed to a minimum without pressing the brushes 100 to 106. Therefore, in the brush holder device 30, a stable rattling suppression effect of the first brushes 100 and 102 and the second brushes 104 and 106 can be obtained.

  In addition, an inclined surface 76B is formed on the guide column 76 immediately before reaching the facing surface 76A in the movement of the brushes 100 to 106 toward the commutator 28 side. Thereby, when assembling each brush 100-106 which has each step part 100A-106A to the brush holder 88, the attitude | position of each brush 100-106 in the brush holder 88 is arranged smoothly, and each brush 100-106 is adjusted. Can be moved to the commutator 28 side in a normal posture (a posture where the brush side surface is substantially parallel to the first side wall 88A and the facing surface 76A).

  An insertion groove 96 is formed in the upper wall 88 </ b> C of the brush holder 88, and the pigtail 108 is inserted into the insertion groove 96. Thereby, interference with the pigtail 108 and the brush holder 88 is suppressed.

  Here, a notch 98 is formed in the second side wall 88 </ b> B, and a guide pillar 76 is disposed in the notch 98. Thereby, since the guide pillar 76 is arrange | positioned inside the brush holder 88, the enlargement in the radial direction of the brush holder apparatus 30 can be suppressed. That is, if the guide column 76 is disposed outside the brush holder 88, the guide column 76 is disposed closer to the commutator 28 than the brush holder 88. For this reason, the base plate 50 becomes larger in the radial direction, and consequently the brush holder device 30 becomes larger in the radial direction.

  In addition, the notch 98 is spaced from the upper wall 88C. That is, the notch 98 is not formed in the upper wall 88C. Thereby, the intensity | strength of the upper wall 88C can be made high. That is, if the notch 98 is formed in the upper wall 88C, the insertion groove 96 and the notch 98 are formed in the upper wall 88C, so that the strength of the upper wall 88C in the brush holder 88 is reduced. On the other hand, since the notch 98 is not formed in the upper wall 88C, the strength of the upper wall 88C can be increased compared to the above case, and consequently the strength of the brush holder 88 can be increased.

  Further, the base plate 50 is provided with an abutting wall 78. The abutting wall 78 is arranged in parallel with the first side wall 88A and is configured to be able to abut on the outer surface of the first side wall 88A. . Therefore, when the brush holder 88 is fixed to the base plate 50, the brush holder 88 can be fixed to the base plate 50 while the first side wall 88A is in contact with the contact wall 78. Accordingly, the position of the brush holder 88 in the circumferential direction of the base plate 50 and the shape of the first side wall 88A with respect to the bottom wall 88D can be determined by the contact wall 78, and the positional relationship between the guide column 76 and the first side wall 88A is easy. Can be adapted to

  Further, the gear housing 34 to which the brush holder device 30 is fixed closes the opening of the motor housing 14 to constitute the motor main body 12. For this reason, in the motor 10 in which the brush holder device 30 is used, the first brushes 100 and 102 and the second brush when the rotary shaft 20 is rotated while maintaining smooth brush movement in the brush holder 88 of the motor 10. A stable rattling suppression effect in the width direction of the brushes 104 and 106 can be obtained.

  In the present embodiment, since the base plate 50 is formed of a resin material, the brush is preferably used as a preferable configuration in which direct contact of the brush is avoided and thermal deformation is prevented (smooth movement of the brush is not hindered). The holder 88 is formed in a rectangular cylindrical shape having a bottom wall 88D. However, if the base plate 50 is formed of a resin material having sufficient heat resistance, the bottom wall 88D of the brush holder 88 is omitted, and the brush holder 88 may be formed in a substantially inverted U shape opened to the base portion 52 side when viewed from the longitudinal direction.

  In the present embodiment, the guide column 76 protrudes from the base portion 52 to the front of the upper wall 88C. Instead of this, the guide pillar 76 may protrude from the base portion 52 so as to penetrate the upper wall 88C of the brush holder 88. In this case, the notch 98 is formed from the bottom wall 88D of the brush holder 88 to the upper wall 88C.

  Further, in the present embodiment, the brush holder device 30 is used in the so-called four-pole motor 10 having four brushes, but the brush holder device 30 is used for a motor having a different number of poles and number of brushes from the motor 10. May be. For example, the brush holder device 30 is used for a so-called two-pole motor, and the motor has three brushes (a high-speed brush that operates the vehicle wiper device in a high-speed mode and a low-speed motor that operates the vehicle wiper device in a low-speed mode. And a common brush used for both low speed and high speed).

  In the present embodiment, the motor 10 includes the motor main body 12 and the speed reduction unit 32. Instead of this, the speed reduction part 32 may be omitted from the motor 10, and an end plate fixed to the opening of the motor housing 14 and closed may be provided separately, and the brush holder device 30 may be fixed to the end plate. Good. That is, you may use the brush holder apparatus 30 for the motor 10 which is not provided with the deceleration part 32. FIG. In this case, the end plate is the second housing of the present invention.

  In the present embodiment, the cover plate 42 that closes the opening of the gear housing 34 is made of an insulating resin material. However, as an EMC (electromagnetic compatibility) measure, the cover plate 42 is made of metal. It is preferable to configure as a case (for example, made of aluminum or aluminum alloy like the gear housing 34) to have a shielding effect.

  In the present embodiment, the motor body 12 of the motor 10 is a motor in which the motor body 12 rotates forward and backward. However, a current having a polarity fixed to the pair of first brushes 100 and 102 and the pair of second brushes 104 and 106. For example, the pair of first brushes 100 and 102 may be fixed as a positive electrode brush and the pair of second brushes 104 and 106 may be fixed as a negative electrode brush to form a motor 10 that rotates in one direction.

DESCRIPTION OF SYMBOLS 10 ... Motor, 14 ... Motor housing (first housing), 16 ... Permanent magnet, 20 ... Rotating shaft, 28 ... Commutator, 30 ... Brush holder device, 32 ...・ Gear housing (second housing), 50... Base plate, 52... Base portion, 76... Guide pillar (suppressing portion), 78. Brush holder, 88A ... first side wall, 88B ... second side wall, 88C ... top wall, 88D ... bottom wall, 90 ... fixing claw (fixed part), 96 ... insertion Groove (insertion part), 98 ... Notch part, 100, 102 ... First brush (brush), 100A, 102A, 104A, 106A ... Step part, 104, 106 ... Second brush (brush ), 108 ... Pigtail.

Claims (4)

A base plate that is made of resin and is arranged radially outward with respect to a commutator fixed to a rotating shaft that forms part of the motor;
A brush holder configured to include a first side wall and a second side wall that are fixed to the base plate and arranged to face each other in the circumferential direction of the rotation shaft;
It is inserted between the first side wall and the second side wall, is held in the brush holder so as to be movable toward the commutator side, and is opened to the commutator side on the side surface facing the second side wall. A brush formed with a stepped portion,
A suppressor that is integrally formed with the base plate, is disposed in the stepped portion, and suppresses movement of the brush in the width direction with the first side wall;
A brush holder device comprising: The brush holder has an upper wall that connects the first side wall and the second side wall and is formed with an insertion portion through which a pigtail provided in the brush is inserted,
At the end portion on the commutator side of the second side wall, a notch portion that is opened to the commutator side and is spaced apart from the upper wall is formed,
The brush holder device according to claim 1, wherein the suppressing portion is disposed in the cutout portion. The brush holder includes a bottom wall disposed to face the upper wall, a fixed portion that is formed on both ends of the bottom wall in the longitudinal direction of the brush holder and fixes the brush holder to the base plate, Have
The brush holder device according to claim 2, wherein the base plate has a contact portion provided so as to be able to contact the outer surface of the first side wall. A first housing which is formed in a cylindrical shape and houses an armature including a commutator fixed to the rotating shaft;
A second housing that is fixed and closed in the opening of the first housing;
A permanent magnet provided on the inner peripheral surface of the first housing;
The brush holder device according to any one of claims 1 to 3, which is fixed to the second housing,
With motor.

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