JP2015100144A - Dc motor with brush and vehicle auxiliary machine system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a DC motor with a brush which improves heat radiation performance of a brush holder and thereby inhibits temperature rise of the brush, and to provide a vehicle auxiliary machine system using the DC motor.SOLUTION: A DC motor with a brush includes: a brush 8 which slidably contacts with a commutator, which rotates with a rotor around which a coil is wound, and thereby is electrically connected with the coil; a brush holder 9 holding the brush 8; and a metal plate member 11 holding a brush holder attachment part 10 formed by an insulation material. The DC motor with the brush has a recessed part 10m, to which the brush holder 9 is fixed, at the brush holder attachment part 10. A protruding part 13, which extends from the bottom surface side of the recessed part 10m to the upper edge side while facing a side surface 10s1 of the recessed part 10m, is provided at the brush holder 9. The protruding part 13 and the side surface 10s1 are thermally connected.

Description

  The present invention relates to a DC motor with a brush and its brush holder.

  DC motors with brushes are often used in auxiliary systems such as skid prevention devices for automobiles, but the size of the motor is flat due to the mountable area (structure with a larger radial dimension than the motor output shaft direction). ). In this case, not only the magnetic circuit portion of the motor but also the brush device portion must be reduced in size, particularly reduced in thickness. Therefore, a method is known in which the brush holder is made thin by providing a brush holder position restricting portion on the side surface of the brush holder (for example, Patent Document 1).

  In the brush holding device for a DC motor described in Patent Document 1, a through hole is formed at a fixed position of an insulating substrate on which a brush holder made of a holder metal fitting and a metal bottom plate is fixed, and the through hole is closed. A metal bottom plate is disposed on the mounting surface of the insulating substrate. The metal bottom plate is formed with a left through hole and a right through hole that are inserted through the left caulking piece and the right caulking piece that are thinner than the thickness of the insulating substrate formed in the holder metal fitting and project into the through hole. Clamp the protruding parts of the left caulking piece and right caulking piece that protrude into the through hole to the opposite side of the protruding part in the through hole so that the protruding part does not protrude from the through hole. The bottom plate is connected (see summary). In this brush holding device, the bottom portion of the brush holder is inserted into the through hole of the insulating substrate, and the position restriction portion of the brush holder is provided on the side surface of the brush holder. ) Is realized.

JP 2011-223710 A

  By the way, with the increase in the output of the auxiliary machine system and the increase in operation time, the amount of current to be supplied to the motor is increasing. When a DC motor with a brush is energized, loss mainly occurs in the vicinity of the brush and the winding. In particular, in the vicinity of the brush, a sliding loss between the brush and the commutator is generated in addition to the energization loss, and the amount of heat generated is large. Although not described in Patent Document 1, heat generated in the vicinity of the brush is radiated mainly from a brush holder to a metal front plate embedded in a resin insulating substrate. Therefore, in order to increase the output of a DC motor with a brush, a technique for suppressing a temperature rise in the vicinity of the brush of the motor, particularly a technique for improving the heat dissipation from the brush holder to the front play is required.

  However, when the brush holder is fixed so as to be laminated on a metal front plate so as to improve the heat dissipation of the brush holder as in Patent Document 1, the dimension in the thickness direction becomes large.

  In addition, when a through hole (notch) is formed in the front plate and the brush holder is embedded in the through hole in order to reduce the size in the thickness direction, the periphery of the through hole formed in the front plate A brush holder mounting portion formed of resin is configured. In such a configuration, in order to avoid deformation of the brush holder due to thermal expansion of the resin, it is necessary to provide a space between the side surface of the brush holder and the resin portion. Because of this space, there is no heat dissipation path from the brush holder to the front plate, and the temperature rise of the brush increases.

  The present invention has been made to solve the above-described problems, and its object is to improve the heat dissipation of the brush holder and suppress the temperature rise of the brush, and a vehicle using the motor using the motor. It is to provide an auxiliary machine system.

  In order to achieve the above object, in the present invention, a brush that is electrically connected to the coil by sliding contact with a commutator that rotates together with the rotor around which the coil is wound, and a brush holder that holds the brush And a brush plate direct current motor having a recess in which the brush holder is fixed to the brush holder mounting portion. A protruding portion extending from the bottom surface side of the concave portion toward the upper edge side is provided to face the side surface of the concave portion, and the protruding portion and the side surface are thermally connected.

  ADVANTAGE OF THE INVENTION According to this invention, the DC motor with a brush which improved the heat dissipation of the brush holder and suppressed the temperature rise of a brush, and the auxiliary machine system for vehicles using this motor can be obtained.

Sectional drawing of the DC motor with a brush which concerns on this invention. The perspective view of the brush vicinity in the 1st Example which concerns on this invention. Sectional drawing of the brush vicinity which shows the IIB-IIB cross section of FIG. 2A. Sectional drawing of the brush vicinity in the comparative example with this invention. Sectional drawing of the brush vicinity in the 2nd Example which concerns on this invention. The figure which shows the manufacturing process of 2nd Example. Sectional drawing of the brush vicinity in the 3rd Example which concerns on this invention. The figure which shows the manufacturing process of 4th Example which concerns on this invention. Sectional drawing of the brush vicinity in 5th Example which concerns on this invention. Sectional drawing of the brush vicinity in 6th Example which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  A first embodiment according to the present invention will be described with reference to FIG. 1, FIG. 2A and FIG. FIG. 1 is a cross-sectional view of a brushed DC motor according to the present embodiment. FIG. 2A is a perspective view showing the vicinity of the brush in the present embodiment. 2B is a cross-sectional view of the vicinity of the brush showing the IIB-IIB cross section of FIG. 2A. FIG. 3 is a cross-sectional view of the vicinity of the brush in a comparative example with the present invention. The configuration of the brushed DC motor shown in FIG. 1 is also applied to first to fifth embodiments described later.

  A description will be given with reference to a cross-sectional view of the brushed DC motor of FIG. The brushed DC motor 1 includes a housing 2, a magnet 3 fixed in the housing 2, a bearing 4 fixed in the housing 2, and a shaft 7 that is rotatably supported in the housing 2 using the bearing 4. The rotor 6 and the commutator 5 that rotate integrally with the shaft 5, and the brush 8 that is pressed against the commutator 5 so as to be slidable. A brush holder 9 for holding the brush 8 is fixed to the front plate 11 via an insulating material 10 (resin mold or the like), and the front plate 11 is fixed to the housing 2. The rotor 6 is provided with a coil 15 through which a drive current is passed. The coil 15 is electrically connected to a commutator 5 (more precisely, a commutator piece formed in the commutator 5) and a lead wire 15a. . The commutator 5 is fixed to the shaft 7 and rotates together with the rotor 6. The brush 8 is electrically connected to the coil 15 by being in sliding contact with the commutator 8. The housing 2 has a bottomed cylindrical shape, and a bearing mounting portion 2b into which the bearing 4 is fitted is formed in an uneven shape on the bottom portion 2a. The magnet 3 fixed to the inner side surface (inner peripheral surface) of the housing 2 constitutes a stator of a brushed DC motor.

  This will be described with reference to a perspective view and a sectional view of the vicinity of the brush 8 in FIGS. 2A and 2B. A position restricting portion 12 of the brush holder 9 is formed between the brush holder 9 and the front plate 11, and a protruding portion 13 of the brush holder 9 is formed between the position restricting portion 12 and the front plate 11. . The position restricting portion 12 is configured in the same manner as in the second embodiment described later. As can be seen from the manufacturing process described in the second embodiment, the position restricting portion 12 is made of the same resin material as the brush holder attaching portion 10. The upper end is crimped by heat caulking. The brush holder 9 is positioned and fixed to the brush holder mounting portion 10 by the position restricting portion 12.

  The brush holder mounting part (brush holder fixing part) formed of the insulating material 10 will be described in detail. A front plate (terminal plate or simply plate member) 11 to which the brush holder 9 is attached has a disk shape, and a circular through hole 11i is formed at the center thereof. That is, the front play 11 is formed in an annular shape. The outer peripheral surface 11o of the front plate 11 is fitted in contact with the inner peripheral surface of the housing 2, and the commutator 5 is disposed on the inner peripheral surface side formed by the through hole 11i. The inner peripheral surface 11i and the commutator 5 Are facing each other.

  The front plate 11 is formed with a notch (notch surface) 11a from the inner peripheral surface 11i side to the outer peripheral surface 11o side, and a resin 10 that is an insulating material is molded into the notch portion 11a. An attachment part (brush holder fixing part) of the brush holder 9 is formed by the resin 10. Hereinafter, the portion where the resin 10 is formed will be described as the brush holder mounting portion 10. The brush holder mounting portion 10 includes a placement surface 10a on which the brush holder 9 is placed, a covering portion 10u that covers the upper surface of the front plate 11, a covering portion 10l that covers the lower surface of the front plate 11, and a covering portion. A connecting portion (inner side surface portion) 10s that connects 10u and the covering portion 10l is formed. The mounting surface 10a is formed in parallel to the plate surfaces (upper surface and lower surface) of the front plate 11, and the inner surface 10s1 of the connecting portion (inner surface portion) 10s is the plate surface (upper surface and lower surface) of the front plate 11 and the mounting surface 10a. The surface is perpendicular to Accordingly, the brush holder mounting portion 10 is formed with a recess 10m for mounting the brush holder 9 by the inner surface 10s1 and the mounting surface 10a, and the brush holder 9 is embedded in the front plate 11 by being attached to the recess. It has a structured. Further, the position of the mounting surface 10 a in the thickness direction of the front plate 11 is matched with the position of the lower surface of the front plate 11. However, if the position of the mounting surface 10a in the thickness direction of the front plate 11 is lower (lower position) than the position of the upper surface of the front plate 11, it does not coincide with the position of the lower surface of the front plate 11. Also good.

  In this specification, the vertical direction and the horizontal direction are defined in FIG. 2B and FIG. 3 to FIG. Accordingly, the vertical direction and the horizontal direction expressed by “upper”, “lower”, “upper surface”, “lower surface”, “left”, “right”, etc. described in the present specification are those of the brushed DC motor 1. It does not mean the vertical direction or the horizontal direction in the mounted state. The front plate 11 forms part of the housing together with the housing 2 of the brushed DC motor 1, but the lower surface of the front plate 11 forms the outer surface (outer surface) of the housing, and the upper surface of the front plate 11 is the inner surface of the housing. (Inner side). That is, the upper surface of the front plate 11 is a surface on the rotor 6 side in the axial direction of the shaft 7, and the lower surface of the front plate 11 is a surface on the counter-rotor 6 side in the axial direction of the shaft 7.

  The brush holder 9 in the present embodiment is composed of a lower covering member (lower holder member) 9 a that covers the lower surface of the brush 8 and an upper covering member (upper holder member) 9 b that covers the upper surface and side surfaces of the brush 8.

  In the present embodiment, the protrusion 13 of the brush holder 9 is formed on the lower covering member 9 a of the brush holder 9. The protruding portion 13 is erected vertically upward from the placement surface abutting portion 9a1 of the lower covering member 9a that abuts on the placement surface 10a of the brush holder mounting portion 10. Thereby, the surface (anti-brush side surface) 13a opposite to the surface facing the brush 8 side of the protruding portion 13 is in contact with and in contact with the inner side surface 10s1 of the brush holder mounting portion 10. In addition, you may interpose the grease-like substance and sheet-like member which improve thermal conductivity between the anti-brush side surface 13a of the protrusion part 13, and inner surface 10s1. In this case, the anti-brush side surface 13a and the inner side surface 10s1 are not in direct contact with each other, but high thermal conductivity can be obtained.

  In the present embodiment, as described above, the recess 10m for attaching the brush holder 9 is formed in the brush holder mounting portion 10, and the inner edge 10s1 that is the side surface of the recess 10m is opposed to the upper edge side from the bottom surface side of the recess 10m. A protruding portion 13 extending toward is provided. The protrusion 13 and the inner side surface 10s1 are thermally connected. Here, the thermal connection between the projecting portion 13 and the inner side surface 10s1 may be a structure in which the projecting portion 13 and the inner side surface 10s1 are in direct contact, or grease that increases thermal conductivity between the projecting portion 13 and the inner side surface 10s1. The structure which interposes a sheet-like substance and a sheet-like member is included.

  In the present embodiment, the protrusion 13 is erected vertically upward with respect to the mounting surface 10a and the mounting surface contact portion 9a1, but as in the second embodiment described later, It is also possible to extend the inclined portion 13 with respect to the placement surface 10a and the placement surface contact portion 9a1. The term “stand-up” used in this specification includes not only the case of being provided vertically but also the case of being provided in an inclined state.

  A space 16 is formed between the inner side surface 10s1 of the brush holder mounting portion 10 made of resin and the brush holder 9 (side surface 9b1 of the upper covering member 9b). This space 16 absorbs deformation when the resin forming the brush holder mounting portion 10 is thermally expanded, and prevents deformation of the brush holder 9. In addition, by providing the position restricting portion 12 in the space 16, the space 16 can be effectively used as an arrangement space for the position restricting portion 12.

  On the other hand, with reference to FIG. 3, the case where the brush holder 9 'which is a comparative example with a present Example is used is demonstrated. Note that FIG. 3 shows a cross section similar to FIG. 2B for the comparative example. A gap is provided between the brush 8 and the brush holder 9 'so that the brush 8 can move freely in the brush holder 9' even if the brush 8 is thermally expanded. Since it is short compared, the thermal resistance is small. Therefore, the heat generated by the brush 8 is transferred from the brush 8 to the pigtail (not shown), and further transferred from the brush 8 to the brush holder 9 '. Therefore, in order to suppress the temperature rise of the brush 8, it is necessary to improve the heat dissipation of the brush holder 9 '. In the conventional brush holder 9 ′, a position restricting portion 12 is formed between the brush holder 9 ′ and the front plate 11, and a portion 9b′2 parallel to the placement surface 10a is formed on the brush holder 9 ′. ing. The space 16 is interposed between the parallel part 9b'2 and the side surface 9b'1 of the brush holder 9 '. As described above, the space 16 absorbs deformation when the resin forming the brush holder mounting portion 10 is thermally expanded, and prevents deformation of the brush holder 9 '. On the other hand, heat transfer from the brush holder 9 ′ to the front plate 11 is hindered. In this comparative example, the portions corresponding to the plate thickness of the lower covering member 9a ′ and the upper covering member 9b ′ constituting the brush holder 9 ′ are only opposed to the front plate 11, and the brush holder 9 ′ and the front plate 11 is small. For this reason, heat radiation from the brush holder 9 to the front plate 11 is performed via the resin 10 along the bottom surface (lower surface) of the brush holder 9. Since the thermal conductivity of the resin is lower than that of metal, the heat resistance of this heat radiation path is extremely large. Therefore, most of the heat released from the brush holder 9 'is limited to heat released from the surface of the brush holder 9' to the air.

  On the other hand, in the embodiment of the present invention, the protruding portion 13 of the brush holder formed between the position restricting portion 12 and the front plate 11 faces the notched portion (notched surface) 11 a of the front plate 11. . At this time, since the protruding portion 13 and the front plate 11 are opposed to each other through the minimum thickness of the resin mold 10 for obtaining electrical insulation, the protruding portion 13 and eventually the brush holder 9 to the front plate 11. The heat resistance of the heat dissipation path is small. Therefore, in this embodiment, not only the heat dissipation path from the brush holder surface in the conventional structure but also the heat dissipation path from the brush holder 9 to the front plate 11 is added, so that the heat dissipation of the brush holder 9 is improved. Thereby, the temperature rise of the brush 8 is suppressed and the high output and miniaturization of the motor 1 are enabled.

  In this embodiment, the protruding portion 13 of the brush holder 9 is formed by the lower covering member 9a, but may be formed by the upper covering member 9b.

  A second embodiment according to the present invention will be described with reference to FIGS. FIG. 4 is a cross-sectional view of the vicinity of the brush in the second embodiment according to the present invention, and shows the same cross section as FIG. 2B. FIG. 5 is a diagram showing a manufacturing process in the present embodiment.

  In the present embodiment, the inner side surface 10s1 and the protruding portion 13 of the brush holder mounting portion 10 are formed obliquely. That is, the inner side surface 10s1 formed on both sides (left and right sides) of the mounting surface 10a of the brush holder mounting portion 10 and the circumferential direction of the brush holder 9 (lower covering member 9a) so as to face the inner side surface 10s1. The protrusions 13 formed on both sides (left and right sides) are such that the distance between the left and right inner side surfaces 10s1 and the protrusions 13 increases from the placement surface 10a toward the upper side (rotor 6 side). It is inclined. Thereby, the inner side surface 10s1 which is the side surface of the recess 10m is formed so as to be inclined with respect to the mounting surface 10a on which the brush holder 9 is mounted and fixed, and the protruding portion 13 is inclined along the inner side surface 10s1. This configuration is realized.

  Next, the manufacturing process will be described with reference to FIGS. After the brush holder 9 is fitted into the resin mold 10 on which the positioning protrusions 10c constituting the position restricting portion 12 are formed, the positioning restricting portion 10c is deformed by the processing jig 14, thereby producing the position restricting portion 12. The brush holder 9 is fixed to the resin mold 10 and then the brush is inserted. At this time, the opening angle of the protrusion θ13 is slightly larger than the opening angle θ10 of the inner side surface 10s1, so that in this step, the brush holder 9 is made of the resin mold 10 constituting the brush holder mounting portion 10. When fitting, the protrusions 13 on both sides are repelled like a spring and pressed against the inner surface 10s1, so that the adhesion between the protrusions 13 and the resin mold 10 is improved. Therefore, the contact thermal resistance between the protrusion 13 and the resin mold 10 is reduced, and heat dissipation from the brush holder 9 to the front plate 11 is improved.

  The manufacturing process described in this embodiment is applied to the first, third, and sixth embodiments except that the inner side surface 10s1 and the protruding portion 13 are formed obliquely.

  In the present embodiment, the protruding portion 13 of the brush holder 9 is formed by the lower covering member 9a, but may be formed by the upper covering member 9b.

  A third embodiment according to the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view of the vicinity of the brush in the third embodiment according to the present invention, and shows the same cross section as FIG. 2B.

  A bent portion is formed so that the tip of the protruding portion 13 formed between the position restricting portion 12 of the brush holder 9 and the front plate 11 is along the upper surface of the covering portion 10 u of the resin 10 that covers the upper surface of the front plate 11. Thus, a bent surface 13b bent with respect to the anti-brush side surface 13a is formed, and the bent surface 13b constitutes a surface facing the front plate 11 in the axial direction (same as the rotation axis direction of the rotor 6). Thereby, since the opposing area of the front plate 11 and the brush holder 9 increases, heat dissipation is further improved. The configuration provided with the bent surface 13b in the present embodiment may be applied to the second embodiment.

  In this embodiment, the protruding portion 13 of the brush holder 9 is formed by the lower covering member 9a, but may be formed by the upper covering member 9b.

  A fourth embodiment according to the present invention will be described with reference to FIG. FIG. 7 is a diagram showing a manufacturing process of the fourth embodiment according to the present invention.

  In the present embodiment, the position restricting portion 12 of the first to third embodiments is created using thermal caulking, but the production cost can be reduced by using caulking instead of thermal caulking. It becomes possible.

  In the present embodiment, the mounting surface 10a of the brush holder 9 is positioned in the middle portion of the front plate 11 in the thickness direction and is directed downward. The upper covering member 9b and the lower covering member 9a are assembled in this order from the lower side of the mounting surface 10a. Alternatively, an assembly (brush holder 9) in which the upper covering member 9b and the lower covering member 9a are assembled with the upper covering member 9b facing upward is assembled to the mounting surface 10a from the lower side of the mounting surface 10a. In order to assemble the upper covering member 9b and the lower covering member 9a, the upper covering member 9b is formed with a through-hole 9b4 through which the protruding portion 9a4 provided in the lower covering member 9a is inserted. The mounting surface 10a is provided with a through hole 10e through which the protruding portion 9a4 is inserted and a through hole 10d through which the protruding portion 13 for transferring heat to the front plate 11 is inserted.

  After the upper covering member 9b and the lower covering member 9a are arranged on the mounting surface 10a, the protruding portion 9a4 is crimped with the processing jig 14, and the brush holder 9 composed of the upper covering member 9b and the lower covering member 9a is attached to the brush holder mounting portion. 10 is fixed.

  In the present embodiment, the height of the protruding portion 13 is further increased so as to protrude from the upper surface of the brush holder mounting portion 10, and at the same time as before or after fixing the brush holder 9 to the brush holder mounting portion 10. The bent surface 13b described in the third embodiment may be formed by bending.

  In this embodiment, the protruding portion 13 of the brush holder 9 is formed by the upper covering member 9b, but may be formed by the lower covering member 9a. In this case, the protruding portion 13 and the protruding portion 9a4 may be formed on the lower covering member 9a. Alternatively, the protruding portion 13 has the function of the protruding portion 9a4, and the protruding portion 13 is configured with the bent surface 13b described in the third embodiment, so that the brush holder 9 is attached to the brush holder mounting portion 10 with the bent surface 13b. It may be fixed.

  A fifth embodiment according to the present invention will be described with reference to FIG. FIG. 8 is a cross-sectional view of the vicinity of the brush in the fifth embodiment according to the present invention, and shows the same cross section as FIG. 2B.

  The brush holder 9 is fixed directly to the brush holder mounting portion 10 by resin molding without using heat caulking or caulking. That is, in this embodiment, the brush holder mounting portion 10 is formed by resin molding on the front plate 11, and the protruding portion 13 is fixed to the brush holder mounting portion 10 by resin molding. At this time, since the protrusion 13 facing the front plate 11 of the brush holder 9 also serves as a position restricting portion of the brush holder 9, the brush holder 9 can be downsized. However, a space 16 is required on the side surface of the brush holder 9 so that the resin mold of the brush holder mounting portion 10 does not directly touch the side surface 9b1 of the brush holder 9.

  In this embodiment, the protruding portion 13 of the brush holder 9 is formed by the lower covering member 9a, but may be formed by the upper covering member 9b.

  A sixth embodiment according to the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view of the vicinity of the brush in the sixth embodiment according to the present invention, and shows the same cross section as FIG. 2B.

  When the resin of the brush holder mounting portion 10 is thermally expanded, it is conceivable that the protruding portion 13 is pushed toward the space 16 and deformed. At this time, it is conceivable that the side end portion 9b5 of the upper covering member 9b is pushed toward the brush 8 by the deformed protruding portion 13. At this time, since the position of the upper covering member 9b is only restricted by the position restricting portion 12, it is likely to be deformed or displaced. In order to avoid this, it is preferable to provide a gap d between the side end portion 9b5 of the upper covering member 9b and the surface of the protruding portion 13 on the brush 8 side. Thereby, the deformation | transformation of the upper coating | coated member 9b by the thermal expansion of the resin of the brush holder attaching part 10 can be prevented.

  In each of the above-described embodiments, when the protruding portion 13 is formed on the lower covering member 9a, the placement surface abutting portion 9a1 of the lower covering member 9a is like a tension rod between the left and right inner side surfaces 10s1 of the brush holder mounting portion 10. This is effective in preventing the positional deviation of the brush holder 9.

  The configuration of the present embodiment can be combined with the bent surface 13b of the third embodiment. Further, the gap d of the present embodiment can be applied to the fifth embodiment.

  Next, the height of the protrusion 13 will be described with reference to FIG. 2B. This description is not limited to the first embodiment.

  In order to increase the heat transfer efficiency from the protrusion 13 to the front plate 11, it is preferable to increase the facing area between the protrusion 13 and the front plate 11. For this purpose, the position of the lower end of the protrusion 13 is preferably the same as the position of the lower end surface of the front plate 11 or lower than the lower end surface of the front plate 11. Further, it is preferable that the position of the upper end of the protrusion 13 is the same as the position of the upper end surface of the front plate 11 or higher than the upper end surface of the front plate 11. In this case, in the thickness direction of the front plate 11, a heat transfer path to the front plate 11 is also formed from a portion that protrudes from the range facing the front plate 11, so that the heat transfer efficiency can be improved. . Further, even if the height of the protruding portion 13 is higher than the height of the inner side surface 10s1 of the brush holder mounting portion 10, the heat transfer efficiency to the front plate 11 through the resin is lowered, so that the height of the upper end of the protruding portion 13 is high. The height position may be the same as the height position of the upper end of the inner side surface 10s1 of the brush holder mounting portion 10, and may be an upper limit position at which the protruding portion 13 can come into contact with the resin. However, even when the height position of the upper end of the protruding portion 13 is higher than the height position of the upper end of the inner side surface 10s1 of the brush holder mounting portion 10, heat radiation to the air may be possible. You may determine the height position of the upper end of the protrusion part 13 in the range to a height position. The configuration described above is intended to form the protruding portion 13 so as to face the entire front plate 11 in the thickness direction of the front plate 11.

  The above description of the height of the protruding portion 13 also applies to the second to sixth embodiments. However, in the third embodiment, the height position of the upper end of the protruding portion 13 is higher than the height position of the upper end of the inner side surface 10 s 1 of the brush holder mounting portion 10. In the fifth embodiment, the height position of the upper end of the protruding portion 13 is lower than the height position of the upper end of the inner side surface 10s1. However, in the case of the third embodiment, the bent portion formed at the upper end portion of the protruding portion 13 is embedded in the covering portion 10u of the resin 10 so that the height position of the upper end of the protruding portion 13 is the brush holder mounting portion. (Resin part) It may become lower than the height position of the upper end of inner surface 10s1 of 10. In the case of the fifth embodiment, the upper end of the protruding portion 13 is protruded from the resin 10 and exposed from the resin 10, so that the height position of the upper end of the protruding portion 13 is set to the brush holder mounting portion (resin portion). ) There are cases where the height of the upper end of the inner side surface 10s1 of 10 becomes higher.

  Moreover, in each Example mentioned above, the brush holder 9 is comprised by two members, the upper coating | coated member 9b and the lower coating | coated member 9a. When the brush holder 9 is composed of two members, the end portions of the two members face the inner side surface 10s1 of the brush holder mounting portion 10 as shown in FIG. At this time, the length of the brush holder 9 facing the inner side surface 10s1 in the height direction (vertical direction) is the sum of the plate thickness dimension of the upper covering member 9b and the plate thickness dimension of the lower covering member 9a. Therefore, the length in which the protruding portion 13 faces the inner side surface 10s1 in the height direction is made longer than the sum of the plate thickness dimension of the upper covering member 9b and the plate thickness dimension of the lower covering member 9a. The heat transfer efficiency to can be improved. When the plate thickness dimension of the upper covering member 9b and the plate thickness dimension of the lower covering member 9a are the same, the length of the protruding portion 13 facing the inner side surface 10s1 in the height direction is the plate thickness dimension of the brush holder 9. It will be sufficient if it is made longer than twice.

  Finally, as a vehicle auxiliary machine system (or automobile auxiliary machine system) using the brushed DC motor 1 of this embodiment, there are a brake system, a power steering, a wiper system, a power window, a power door, a power seat, and the like. Conceivable. By using the motor of this embodiment as a drive unit in such a vehicular auxiliary system, it is possible to increase the output and size of the vehicular auxiliary system.

  In addition, this invention is not limited to each above-mentioned Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

  DESCRIPTION OF SYMBOLS 1 ... DC motor with brush, 2 ... Housing, 3 ... Magnet, 4 ... Bearing, 5 ... Commutator, 6 ... Rotor, 7 ... Shaft, 8 ... Brush, 9 ... Brush holder, 10 ... Insulating material (Brush holder mounting Part), 11 ... front plate, 12 ... position restricting part, 13 ... projecting part, 14 ... processing jig, 15 ... coil, 16 ... space

Claims (9)

A brush that is electrically connected to the coil by sliding contact with a commutator that rotates together with the rotor around which the coil is wound, a brush holder that holds the brush, and a brush holder mounting portion that is formed of an insulating material. In a DC motor with a brush comprising a metal plate member to hold, and having a recess in which the brush holder is fixed to the brush holder mounting portion,
The brush holder is provided with a projecting portion extending from the bottom surface side to the upper edge side so as to face the side surface of the recessed portion, and the projecting portion and the side surface are thermally connected. DC motor with brush. The DC motor with brush according to claim 1,
A DC motor with a brush, wherein a space is provided between a side surface of the brush holder and the protruding portion. In the DC motor with a brush according to claim 2,
The brush direct current motor, wherein the protrusion is formed so that the protrusion faces the whole plate member in the thickness direction of the plate member. In the DC motor with a brush according to claim 3,
A direct current motor with a brush, wherein the protruding portion is in direct contact with an insulating material forming the brush holder mounting portion. In the DC motor with a brush according to claim 4,
A side surface of the concave portion is formed to be inclined with respect to a mounting surface on which the brush holder is mounted and fixed, and the protruding portion is inclined along the side surface. DC motor. In the DC motor with a brush according to claim 4,
A DC motor with a brush, wherein a surface facing the plate member in the rotation axis direction of the rotor is formed at the tip of the protruding portion. In the DC motor with a brush according to claim 4,
Using resin as the insulating material, forming the brush holder mounting portion by resin molding on the plate member,
The brushed DC motor, wherein the protruding portion is fixed to the brush holder mounting portion with the resin mold. In the DC motor with a brush according to claim 4,
The brush holder includes an upper holder member that covers an upper surface and a side surface of the brush, and a lower holder member that covers a lower surface of the brush,
The protrusions are formed on both left and right ends of the lower holder member,
A DC motor with a brush, wherein a gap is formed between the left and right end portions of the upper holder member and the protruding portion.   A vehicle auxiliary system having the brushed DC motor according to claim 1.

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