JP2011193688A - Brush holder device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brush holder device that has a high moldability and can be manufactured at a low cost while suppressing upsizing. <P>SOLUTION: A brush holder 30 includes: a brush case 31 made of a metal; and a plate 32 made of a thermosetting resin. In order to build the brush holder 30, a retainer hook of the brush case 31 is passed through a cutout of the plate 32 to engage the brush case 31 and the plate 32. When the plate 32 provided in the brush holder 30 is press-fit into first and second cutouts 15a, 16a in such a manner as to be abutted against wall faces of first and second engagement projections 15, 16 formed in an upper-side end housing 10 made of a thermoplastic resin, the plate 32 is pressed and fixed by projecting ridges provided in the first and second engagement projections 15, 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a brush holder device provided in a rotating electrical machine.

  2. Description of the Related Art Conventionally, a brush holder included in a rotating electrical machine is provided with a brush, and the brush is disposed so as to be in sliding contact with a commutator fixed to a rotating shaft. The brush energizes the commutator with a current supplied from a power source, and heat is generated at that time. The heat generated by energization for a long time may cause the brush to become hot and cause thermal deformation of the brush holder and the brush holder device.

  Therefore, in the brush holder described in Patent Document 1, a gap is provided between the brush holding portion and the brush so that the brush is held even if the brush holding portion is thermally deformed in the direction of holding the brush by the heat generated by the brush. It has a difficult structure.

  In addition, in order to suppress thermal deformation of the brush holder device, a housing in which the brush holder is provided is formed of a thermosetting resin that is difficult to thermally deform.

JP-A-8-266019

  By the way, in the brush holder which provided the clearance gap between a brush holding part and a brush as mentioned above, since the brush holding part enlarged, there existed a possibility that the whole brush holder apparatus might be enlarged in connection with it.

  Further, if the housing in which the brush holder is provided is made of a thermosetting resin, it is difficult to form the housing because the moldability is low and the material cost is high compared to the thermoplastic resin. Further improvement in moldability and cost of the housing) has been desired.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a brush holder device that has high moldability and can be manufactured at low cost while suppressing an increase in size of the brush holder device. It is to provide.

  In order to solve the above-mentioned problem, the invention according to claim 1 is that a brush holder having a brush case is attached to a brush holding part integrally formed with a motor case, and the brush holding part and the brush case A brush holder device configured to slidably arrange a brush toward a commutator in a space to be formed, and to press the brush toward the commutator with an elastic member on the counter-commutator side. The gist is that a plate made of a thermosetting resin is disposed between the brush disposed in the space and the brush holding portion.

  According to the first aspect of the present invention, since the plate made of the thermosetting resin having excellent heat resistance is disposed on the brush holding portion that holds the brush that is a part of the motor case, the energization of the brush, etc. There is no possibility that the plate will cause thermal deformation or the like due to heat generation.

Further, since the heat of the brush is not directly transmitted to the brush holding part which is a part of the motor case facing the brush through the plate, the brush holding part does not cause thermal deformation or the like.
Therefore, the motor case forming the brush holding portion can be molded with a thermoplastic resin that has a higher moldability and can be formed thinner than a thermosetting resin. As a result, the molding accuracy of the brush holder device is improved, which can contribute to the reduction in noise and vibration of the brush holder device.

  According to a second aspect of the present invention, in the brush holder device according to the first aspect, the brush case is made of a metal having a substantially U-shaped cross section, and an opening formed in a substantially U-shaped cross section. A locking portion that engages with a locked portion provided on the plate is provided so that the portion is closed by the plate, and the locked portion and the locking portion engage with each other, The gist is that the metal brush case and the plate are connected and attached to the brush holding portion.

  According to the invention described in claim 2, the brush case does not easily come off the plate. Further, since the brush case is made of metal, the heat of the brush is easily radiated from the brush case, and as a result, the transfer of heat from the brush to the motor case can be further suppressed.

  According to a third aspect of the present invention, in the brush holder device according to the second aspect, the brush holding portion is provided with locking protrusions for fixing four corners of the brush holder plate, respectively. The gist of the invention is that the plate is provided with notches for press-fitting the four corners from the same direction and press-fitting the four corners.

  According to the third aspect of the present invention, it is easy to position and fix the brush holder to the brush holding portion by simply press-fitting the four corners of the plate from the same direction into the notch portions formed in the respective locking projections. Can be performed.

  According to a fourth aspect of the present invention, in the brush holder device according to the third aspect, the notch formed in each of the locking projections is provided with a protrusion on at least one surface, and by the protrusion, The gist is that the plate is pressed and fixed to the brush holding portion.

According to invention of Claim 4, the protrusion provided in the latching protrusion presses the plate which connected the brush case, and fixes it to a brush holding | maintenance part.
According to a fifth aspect of the present invention, in the brush holder device according to any one of the second to fourth aspects, a guide portion extends and is formed on the opposite brush side of the brush case, and the guide portion is bent. The gist is that an elastic member is disposed between the bent guide portion and the brush disposed in the space.

  According to the fifth aspect of the present invention, the bent guide portion is provided on the opposite brush side of the brush case, and the elastic member is disposed between the brush and the guide portion. For this reason, while pressing a brush with the elastic force of an elastic member, it enables it to suppress that a brush case moves to the brush side with the repulsive force of an elastic member.

  The invention according to claim 6 is the brush holder device according to claim 1, wherein the brush case is made of a thermosetting resin and is integrally formed with the plate.

  According to the sixth aspect of the present invention, since the plate made of the thermosetting resin and the brush case are integrally formed, it is not necessary to perform processing such as locking for assembling the plate and the brush case, and it is easily formed. It becomes possible to do.

  ADVANTAGE OF THE INVENTION According to this invention, while suppressing the enlargement of a brush holder apparatus, a moldability can be provided and the brush holder apparatus which can be manufactured at low cost can be provided.

It is a perspective view of the rotary electric machine in this embodiment. It is sectional drawing of the rotary electric machine in this embodiment. It is a disassembled perspective view of the case of the rotary electric machine in this embodiment. It is a perspective view of the brush holder structure in this embodiment. It is a disassembled perspective view of the brush holder in this embodiment. It is a perspective view of the upper end housing in this embodiment. It is an expanded sectional view of the brush holding part in this embodiment. It is principal part sectional drawing of the rotary electric machine in this embodiment. (A) is a disassembled perspective view of the brush holder in another example, (b) is a perspective view of the state which assembled | attached the brush holder. It is a perspective view of the brush holder in another example.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a rotating electrical machine 1 according to the present embodiment. As shown in FIGS. 1 and 2, the case 2 of the rotating electrical machine 1 of the present embodiment includes a cylindrical yoke housing 3 and a substantially covered cylindrical upper end housing 10 that closes the opening 3 a of the yoke housing 3. And a lower end housing 20 having a substantially bottomed cylindrical shape that closes the lower opening 3 b of the yoke housing 3. An upper end housing 10 and a lower end housing 20 are attached to the yoke housing 3 by a snap fit structure to form a case 2.

  As shown in FIG. 2, a pair of magnets 4 (see FIG. 3) is fixed to the inner peripheral surface 3 c of the yoke housing 3, and an armature (armature) 5 rotates radially inward from the magnets 4. Supported as possible.

  As shown in FIG. 3, a spacer member 6 is provided between the pair of magnets 4 and elastic force acts in the circumferential direction. The spacer member 6 has a shape in which the end portions in the circumferential direction of two substantially semi-cylindrical members are continuous, and a predetermined elastic force acts between the magnets 4 in the circumferential direction so as to hold the magnet 4. It is configured.

  The armature 5 includes a rotating shaft 7, and the rotating shaft 7 is rotatably supported by ball bearings 8 provided in the upper end housing 10 and the lower end housing 20. A commutator 9 is fixed to the rotary shaft 7 located in the upper end housing 10. This commutator 9 is configured such that a brush B provided in a brush holder 30 provided in an upper end housing 10 described later is in sliding contact. Then, the coil (not shown) of the armature 5 is excited from the external power source via the brush B and the commutator 9 so that the armature 5 and the rotating shaft 7 are rotated about the central axis L of the rotating shaft 7 as a rotation center. It has become so.

  The upper end housing 10 is made of a thermoplastic resin, and as shown in FIGS. 2 and 3, the inner recess formed by bulging the central portion of the substantially disk-shaped main body portion 10 a upward is used as the bearing 8. The housing recess 10b for housing and fixing is used. A space for accommodating the commutator 9 fixed to the rotating shaft 7 is formed below the housing recess 10 b for housing the bearing 8. And the through-hole 10c for penetrating the rotating shaft 7 is penetrated and formed in the center position of the accommodation recessed part 10b.

  Further, the substantially disc-shaped main body portion 10a has a pair of brush holding portions 11 inclined in a radial direction and downward from the bulging base end portion at a position facing 180 ° across the central axis L. It is extended and formed. And the guide wall 12 bent in the L-shape is formed in the front-end | tip part of a pair of brush holding | maintenance part 11, respectively.

  As shown in FIG. 6, the pair of brush holding portions 11 has a positioning groove 13 having a U-shaped cross section at the center of the lower surface 11 a recessed from the base end (commutator 9 side) to the guide wall 12 in the longitudinal direction. It is installed. The side walls on both sides formed by forming the U-shaped positioning grooves 13 are used as the positioning side walls 14.

  On the commutator 9 side of the positioning side wall 14 formed with the groove 13 in between, first locking projections 15 are formed so as to face each other. The opposing surfaces of the first locking projections 15 are flush with the side surface of the positioning side wall 14.

  Further, second locking projections 16 are formed on the positioning wall 14 side of the guide wall 12 so as to face each other. The opposing surfaces of the second locking projections 16 are flush with the surface of the first locking projection 15 located on the commutator 9 side (the surface facing the other first locking projections 15). It has become.

  The first locking projections 15 provided on each side wall 14 have a substantially rectangular parallelepiped shape, and as shown in FIG. 7, the corners on the commutator 9 side and the positioning groove 13 side are cut out in a substantially rectangular parallelepiped shape. One notch 15a is provided. The first notch 15 a is formed to a position below the groove 13 of the side wall 14 located below the first locking protrusion 15.

  The first cutout portion 15a has a first wall surface W1 that intersects at right angles to the circumferential direction, and a second wall surface W2 that intersects at right angles to the radial direction. A semi-cylindrical first clamping protrusion T1 is formed on the first wall surface W1 in the radial direction (width direction) so as to divide the width direction of the first wall surface W1 into two equal parts. Yes. Further, a semi-cylindrical first pressing protrusion A1 protrudes from the first wall surface W1 on the upper surface (the third sidewall W3 (see FIG. 7)) that intersects the first wall surface W1 and the second wall surface W2 at right angles. In order not to intersect with the formed first clamping protrusion T1, it is biased toward the positioning groove 13 and extends along the radial direction.

  The second locking projection 16 provided on the guide wall 12 has a substantially rectangular parallelepiped shape, and as shown in FIG. 7, the corners on the commutator 9 side and the positioning groove 13 side are notched into a substantially rectangular parallelepiped shape. The second notch portion 16a is provided. The second cutout portion 16 a is formed so as to penetrate the brush holding portion 11 from the guide wall 12 positioned below the second locking projection 16. In the present embodiment, the pair of second cutout portions 16 a formed through the brush holding portion 11 are connected to each other by cutting out the brush holding portion 11.

  The second notch portion 16a has a first wall surface S1 that intersects at right angles to the circumferential direction and a second wall surface S2 that intersects at right angles to the radial direction. And in the center part of the radial direction (width direction) of the 1st wall surface S1, the semicylinder-shaped 2nd clamping protrusion T2 is extended and formed so that the width direction of 1st wall surface S1 may be divided into 2 equally. Yes. In addition, the semi-cylindrical second pressing protrusion A2 is formed to protrude from the first wall surface S1 on the upper surface (third wall surface S3) intersecting the first wall surface S1 and the second wall surface S2 at right angles. In order not to intersect with the second clamping protrusion T2, the positioning groove 13 is biased toward the positioning groove 13 so as to extend along the radial direction.

The brush holder 30 is attached between the pair of first locking protrusions 15 and the pair of second locking protrusions 16.
As shown in FIG. 5, the brush holder 30 includes a brush case 31 and a plate 32 attached to the brush case 31.

  The brush case 31 is made of a metal having high thermal conductivity, is formed in a substantially U-shaped cross section, and side walls 31b surrounding the side surfaces of the brush B are formed at both ends in the short direction of the substantially rectangular parallelepiped main body 31a. Yes. The interval between the outer surfaces of the side walls 31b is made to coincide with the interval between the opposing surfaces of the pair of first locking projections 15 (the same applies to the opposing surfaces of the pair of second locking projections 16). ing.

  In FIG. 5, a guide plate 31c as a guide portion extending backward (on the side of the counter commutator 9) is formed on the main body portion 31a, and the guide plate 31c and the main body portion 31a are connected to the brush B. A notch 31e for guiding a pigtail (not shown) is formed.

  First latch hooks F <b> 1 are formed at the end portions of the side walls 31 b on the commutator 9 side so as to extend to the counter commutator 9 side. Further, second latch hooks F2 are formed at the end portions of the side walls 31b at a predetermined distance from the first latch hooks F1 toward the counter commutator 9 so as to extend to the counter commutator 9 side. Yes.

The plate 32 is latched on each of the first latching hooks F1 and the second latching hooks F2 provided at the end of the side wall 31b.
The plate 32 is made of a thermosetting resin and has a substantially rectangular parallelepiped plate shape, and the thickness thereof is the upper surface of the side wall 14 and the third wall surface W3 (third) of the first cutout portion 15a (second cutout portion 16a). The distance between the wall surfaces S3) is matched. The plate 32 is cut out in a rectangular shape at both sides at the center in the longitudinal direction. That is, the width (length in the short direction) of the central portion in the longitudinal direction of the plate 32 is narrow, and both end portions sandwiching the narrow portion 32a are wide portions 32b and 32c.

  The widths of both ends of the narrow portion 32a are made to coincide with the distance between the outer surfaces of both side walls of the brush B. Further, the widths of both ends of the wide portion 32b on the commutator 9 side are matched with the interval between the first wall surfaces W1 of the first notches 15a formed by the first locking protrusions 15. Further, the width of both ends of the wide portion 32c on the side of the counter commutator 9 is made to coincide with the interval between the first wall surfaces S1 of the second notches 16a formed by the respective second locking protrusions 16.

  Therefore, the wide portion 32b on the commutator 9 side of the plate 32 is respectively formed in the first cutout portion 15a formed with the first locking projection 15, and the wide portion 32c on the counter commutator 9 side of the plate 32 is respectively formed on the first notch portion 15a. 2 can be pushed into the second notch 16a formed with the locking projection 16. That is, the plate 32 is inserted from above between the first locking projection 15 and the second locking projection 16 so that the wide portions 32b and 32c are not caught. Then, the first and second cutout portions 15a and 16a are fitted and supported from the inserted diagonally upper position.

  At this time, the plate 32 is clamped by the semi-columnar first and second clamping protrusions T1 and T2 formed on the first wall surfaces W1 and S1 of the first and second cutout portions 15a and 16a. The plate 32 is pressed by the first and second pressing ridges A1 and A2 having a semi-cylindrical shape formed on the third wall surfaces W3 and S3 of the first and second cutout portions 15a and 16a.

  In addition, rectangular first latching holes K1 are formed in both sides of the wide portion 32b on the commutator 9 side of the plate 32 so as to penetrate in the thickness direction of the plate 32, respectively. In addition, rectangular second retaining holes K2 are formed in both sides of the wide portion 32c of the plate 32 on the side opposite to the commutator 9 so as to penetrate in the thickness direction of the plate 32.

  The first latching hole K1 is hooked with the first latching hook F1 of the brush case 31, and the second latching hole K2 is hooked with the second latching hook F2 of the brush case 31. Specifically, the tips of the first and second latching hooks F1, F2 of the brush case 31 are inserted into the corresponding first and second latching holes K1, K2 of the plate 32. Then, the plate 32 is moved along the bends of the first and second latching hooks F1, F2, and the first and second latching hooks F1, F2 are passed through the first and second latching holes K1, K2. The brush case 31 is engaged with the plate 32. Since the first and second hooks F1 and F2 are bent, it is difficult for the plate 32 to come off.

  As described above, the brush case 31 to which the plate 32 is attached is fitted and fixed to the first and second cutout portions 15a and 16a by fitting and fixing the plate 32 to the first and second cutout portions 15a and 16a. It is fixed to the brush holder 11.

  As shown in FIG. 4, the brush case 31 (brush holder 30) to which the plate 32 fixed to the brush holding unit 11 is attached corresponds to the space formed between the plate 32 and the brush case 31. A substantially rectangular parallelepiped brush B is inserted. At this time, the brush B is supported by the brush holding part 11 via the plate 32 made of a thermosetting resin.

  When the brush B is inserted to the position where the brush B comes into sliding contact with the commutator 9, the coil spring 33 is inserted into the outer peripheral side of the upper end housing 10 in the brush B. Then, as shown in FIG. 8, in the brush case 31, the guide plate 31 c is bent toward the plate 32 side. Accordingly, the coil spring 33 is contracted, and the brush B is brought into sliding contact with the commutator 9 by the elastic force of the coil spring 33.

  The coil spring 33 presses the brush B and generates a repulsive force that presses the guide plate 31 c of the brush case 31. The brush case 31 is pressed toward the counter commutator 9 by the coil spring 33. For this reason, when the rotating electrical machine 1 is installed so that the brush B is in sliding contact with the commutator 9 in the downward direction, the brush case 31 that moves to the commutator 9 side is caused by the repulsive force of the coil spring 33. , So as not to move to the commutator 9 side.

Next, a snap fit structure for connecting the upper end housing 10 and the yoke housing 3 will be briefly described.
As shown in FIG. 2, in the upper end housing 10, a snap-fit structure is formed at a position between the pair of brush holding portions 11 and facing each other across the through hole 10c formed in the main body portion 10a. ing.

  A pair of cover walls C that protrude in one axial direction from the outer edge of the main body 10a and abut against the upper opening 3a of the yoke housing 3 are formed. The pair of cover walls C are cut and formed in the axial direction at four locations in the circumferential direction. By the cutting, five first to fifth side walls C1 to C5 are formed from one cover wall C, respectively.

  And the 1st side wall C1 adjacent to the one brush holding part 11 and the 5th side wall C5 adjacent to the other brush holding part 11 are formed in the same shape. The second side wall C2 adjacent to the first side wall C1 and the fourth side wall C4 adjacent to the fifth side wall C5 are formed in the same shape.

  The first side wall C1 and the fifth side wall C5 are formed with positioning protrusions D1 and D2 on the outer circumference in the radial direction of the distal end. When the upper end housing 10 closes the upper opening 3 a of the yoke housing 3, the positioning protrusions D <b> 1 and D <b> 2 come into contact with the upper opening end of the yoke housing 3.

  The third side wall C3 is formed to be longer in the axial direction than the first side wall C1 (and the fifth side wall C5), and at the substantially intermediate position (the same formation position as the positioning projections D1 and D2), the outer side in the outer peripheral surface radial direction. A positioning projection D3 is formed on the surface. When the upper end housing 10 closes the upper opening 3 a of the yoke housing 3, the positioning projection D 3 comes into contact with the upper opening end of the yoke housing 3.

  The positioning projection D3 is formed with a fitting convex portion D4 at the center position of the lower surface thereof. When the upper end housing 10 closes the upper opening 3a of the yoke housing 3, the fitting convex portion D4 is fitted into the upper fitting concave portion 3d formed at the upper opening end of the yoke housing 3, and the yoke housing is fitted. The upper end housing 10 is positioned and fixed in the circumferential direction with respect to 3.

  The second side wall C2 and the fourth side wall C4 are formed such that the axial direction is longer than the position of the positioning projection D3 formed on the third side wall C3, and the hook portion D5 is formed on the outer periphery in the radial direction of the tip outer peripheral surface. . When the upper end housing 10 closes the upper opening 3a of the yoke housing 3, the tip portions of the second side wall C2 and the fourth side wall C4 bend and press the inner peripheral surface 3c into the yoke housing 3. Inserted. Eventually, when the hook portion D5 reaches the upper latching through-hole 3e formed on the side surface of the yoke housing 3, the hook portion D5 falls into and fits into the upper latching through-hole 3e with an elastic force. As a result, the upper end housing 10 is prevented from being detached from the yoke housing 3.

Next, a snap fit structure for connecting the lower end housing 20 and the yoke housing 3 will be briefly described.
The outer peripheral wall E of the bottomed cylindrical lower end housing 20 is cut in four axial directions in the circumferential direction. A pair of snap side walls E1 and a pair of positioning side walls E2 corresponding to each other are formed by the cuts.

  The positioning side wall E <b> 2 has a positioning projection G <b> 1 on the outer side in the outer peripheral surface radial direction at a substantially intermediate position. When the lower end housing 20 closes the lower opening 3 b of the yoke housing 3, the positioning projection G <b> 1 comes into contact with the lower opening end of the yoke housing 3.

  Further, the positioning projection G1 is formed with a fitting convex portion G2 at the center position of the upper side surface thereof. When the lower end housing 20 closes the lower opening 3b of the yoke housing 3, the fitting convex portion G2 is fitted into the lower fitting concave portion 3f formed at the lower opening end of the yoke housing 3. Thus, the positioning of the lower end housing 20 in the circumferential direction relative to the yoke housing 3 is fixed.

  The snap side wall E <b> 1 has a hook portion G <b> 3 formed on the outer periphery in the outer peripheral direction of the tip. When the lower end housing 20 closes the lower opening 3b of the yoke housing 3, the tip end portion of the snap side wall E1 is bent and inserted into the yoke housing 3 while pressing the inner peripheral surface 3c. . Eventually, when the hook part G3 reaches the lower latching through-hole 3g formed on the side surface of the yoke housing 3, the hook part G3 falls into and fits into the lower latching through-hole 3g with an elastic force. . Accordingly, the lower end housing 20 is prevented from being detached from the yoke housing 3.

Next, characteristic effects of the present embodiment will be described.
(1) In this embodiment, since the plate 32 made of a thermosetting resin having excellent heat resistance is disposed on the brush holding portion 11 that holds the brush B that is a part of the upper end housing 10, the brush B There is no possibility that the plate 32 will cause thermal deformation or the like due to the heat generated by the energization or the like (or frictional heat generated when the brush B and the commutator 9 rub against each other).

  Further, the heat of the brush B is not directly transmitted to the brush holding part 11 which is a part of the upper end housing 10 facing the brush B via the plate 32, and there is no possibility that the brush holding part 11 causes thermal deformation or the like.

  Therefore, the upper end housing 10 that forms the brush holding portion 11 can be molded from a thermoplastic resin that has a higher moldability and can be formed thinner than a thermosetting resin. As a result, the molding accuracy of the brush holder device is improved, which can contribute to the reduction in noise and vibration of the brush holder device.

In addition, since the thermoplastic resin has a lower cost than the thermosetting resin, the brush holder device can be configured at a low cost.
(2) In the present embodiment, the first and second latching hooks F1 and F2 of the brush case 31 that are through-engaged with the first and second latching holes K1 and K2 of the plate 32 are bent. Accordingly, the brush case 31 does not fall out of the brush holding unit 11 without coming out of the plate 32. Further, since the brush case 31 is made of metal, the heat of the brush B is easily radiated from the brush case 31, and as a result, the transfer of heat from the brush B to the end housing 10 (brush holding portion 11) is further suppressed. Can do.

  (3) In the present embodiment, the plate 32 is press-fitted into the first and second cutout portions 15a and 16a so as to contact the wall surfaces W2 and S2 of the first and second locking projections 15 and 16, respectively. Therefore, it is possible to easily position the plate 32 (brush holder 30). Further, the first and second holding protrusions T1 and T2 provided on the first and second locking protrusions 15 and 16 and the first and second pressing protrusions A1 and A2 hold the plate 32 respectively. The plate 32 is fixed by pressing. For this reason, the plate 32 is firmly formed by the first and second clamping protrusions T1 and T2 provided on the first and second locking protrusions 15 and 16, and the first and second pressing protrusions A1 and A2. Can be fixed.

  (4) In the present embodiment, the coil spring 33 is disposed at a position where the guide plate 31c of the brush case 31 is folded back and sandwiched between the brush B and the guide plate 31c. For this reason, while pressing the brush B with the elastic force of the coil spring 33, it is suppressed that the brush case 31 moves to the brush B side by the repulsive force of the coil spring 33.

(5) In this embodiment, since the brush case 31 is comprised with a metal with high heat conductivity, it becomes easy for the brush B to radiate heat, and it is possible to improve the life of the brush.
In addition, you may change embodiment of this invention as follows.

  In the above embodiment, two first and second locking projections 15 and 16 are provided, but the number is not limited to this. Note that it is desirable to change the shape of the plate 32 in accordance with the number of the first and second locking projections 15 and 16.

  In the above embodiment, the protrusions T1 and A1 are provided on the first locking protrusion 15 and the protrusions T2 and A2 are provided on the second locking protrusion 16, respectively. Only one protrusion may be provided, or three or more protrusions may be provided. Further, the shape of the protrusion may be other than a semi-cylindrical shape.

In the above embodiment, the upper end housing 10 and the yoke housing 3 are configured with a snap-fit structure, but may be fixed with screws or the like.
In the above embodiment, the first and second latching hooks F1 and F2 of the brush case 31 have shapes with bent ends, but are not limited to this, and may have other shapes.

In the above embodiment, the coil spring 33 is used as the elastic member. However, it may be an elastic member, and may be a leaf spring or the like.
In the above embodiment, the plate 32 is latched to the brush case 31 by the first and second latching hooks F1 and F2 of the brush case 31, but the present invention is not particularly limited thereto. 9A and 9B, the plate 32 may be fixed to the brush case 31 by caulking. As shown in FIG. 9A, a plurality of caulking pieces 41 (each side wall 31b in FIG. 9) are provided on each side wall 31b of the brush case 31 in a state before caulking. 2) are formed. Then, as shown in FIG. 9B, the plate 32 is fixed to the brush case 31 by each of the caulking pieces 41 of the brush case 31 being inserted into the through holes 42 formed in the plate 32 and caulked. It has become so. Even with such a configuration, the same effects as those of the above embodiment can be obtained.

  In the above-described embodiment, the brush case 31 and the plate 32 are configured as separate bodies (the brush case 31 is made of metal and the plate 32 is a thermosetting resin). The case 31 and the plate 32 may be integrally formed with a thermosetting resin (see FIG. 10). According to this configuration, since the plate 32 and the brush case 31 made of the thermosetting resin are integrally formed, a process such as locking for assembling the plate 32 and the brush case 31 is not required, and the plate is easily formed. It becomes possible. In the example shown in FIG. 10, a prevention wall 51 that prevents the coil spring 33 from popping out is provided on the brush case 31 and the plate 32 at the end on the side opposite to the commutator of the brush holder 30 (the end on the front side in FIG. 10). In addition to this, for example, the prevention wall 51 may be additionally mounted as a separate body on the integrally formed product of the plate 32 and the brush case 31.

  DESCRIPTION OF SYMBOLS 9 ... Commutator, 11 ... Brush holding part, 15 ... 1st latching protrusion, 15a ... 1st notch part, 16 ... 2nd latching protrusion, 16a ... 2nd notch part, 30 ... Brush holder, 31 ... Brush case, 31c ... Guide plate as guide part, 32 ... Plate, 33 ... Coil spring (elastic member), A1 ... First pressing ridge, A2 ... Second pressing ridge, B ... Brush, F1 ... First hook Stop hook (locking portion), F2 ... second hook hook (locking portion), K1 ... first hook hole (locked portion), K2 ... second hook hole (locked portion), T1 ... 1st clamping ridge, T2 ... 2nd clamping ridge.

Claims (6)

A brush holder having a brush case is attached to a brush holding portion formed integrally with the motor case, and the brush is disposed in a space formed by the brush holding portion and the brush case so as to be slidable toward the commutator. And a brush holder device configured to press the brush toward the commutator with an elastic member,
A brush holder device, wherein a plate made of a thermosetting resin is disposed between the brush disposed in the space and the brush holding portion. The brush holder device according to claim 1, wherein
The brush case is made of metal having a substantially U-shaped cross section, and the locked portion provided in the plate so that the opening formed in the substantially U-shaped cross section is closed by the plate. A locking part is provided to engage with the stopper,
The metal brush case and the plate are connected and the brush holder device is attached to the brush holding portion by engaging the locked portion and the locking portion. In the brush holder device according to claim 1 or 2,
The brush holding part is provided with locking projections for fixing the four corners of the plate of the brush holder, and the four corners of the plate are press-fitted into the locking projections from the same direction, and the four corners are press-fitted and fixed. A brush holder device comprising a notch portion. The brush holder device according to claim 3,
The notch formed in each locking protrusion is provided with a protrusion on at least one surface,
The brush holder device, wherein the plate is pressed by the protrusions and the plate is fixed to the brush holding portion. In the brush holder device according to any one of claims 2 to 4,
A guide portion extends and is formed on the opposite brush side of the brush case, the guide portion is bent, and an elastic member is disposed between the bent guide portion and the brush disposed in the space. A brush holder device. The brush holder device according to claim 1, wherein
The brush case device is characterized in that the brush case is made of a thermosetting resin and is integrally formed with the plate.

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