JP6480150B2 - Brush holding mechanism - Google Patents

Description

  The present invention relates to a brush holding mechanism.

  Conventionally, motors have been used as drive sources for various devices and products. For example, DC motors are used in many fields for small motors. In the DC motor, a brush is used for slidingly contacting the commutator and causing a current to flow through the windings of the rotor. A holder has been devised for holding such a brush so as to be slidable in the radial direction.

  However, if the brush is displaced and vibrates in the holder when the motor is driven, it may cause noise, which may shorten the brush life or the motor life. Therefore, it is necessary to regulate the displacement of the brush in the holder to some extent. For example, a brush holding device has been devised that includes a leaf spring that urges a brush housed in the holder toward the inner wall of the holder (see Patent Document 1).

Japanese Utility Model Publication No. 1-162765

  However, in the brush holding device described above, the circumferential movement of the slip ring that intersects the sliding direction of the brush is not restricted.

  This invention is made | formed in view of such a condition, The place made into the objective is to provide the new technique which controls the movement of the predetermined direction of the brush in a holder.

  In order to solve the above-described problems, a brush holding mechanism according to an aspect of the present invention includes a brush that is in sliding contact with a commutator of a motor, a holder that houses the brush, and a regulating member that is inserted into the holder together with the brush. . The restricting member is configured to slidably hold the brush toward the commutator and to urge the brush in the circumferential direction of the commutator with respect to the inner wall of the holder.

  It should be noted that any combination of the above-described constituent elements and a representation of the present invention converted between a method, an apparatus, a system, etc. are also effective as an aspect of the present invention.

  According to the present invention, the movement of the brush in a predetermined direction in the holder can be restricted.

1 is a front view of a DC motor according to an embodiment. It is a disassembled perspective view of a DC motor. It is AA arrow sectional drawing of FIG. It is a top view which shows the principal part of the brush housing which concerns on this Embodiment. It is a perspective view which shows the principal part of the brush housing which concerns on this Embodiment. It is a perspective view which shows the principal part of the brush housing seen from the direction different from FIG. It is a perspective view which shows the brush holding mechanism which concerns on this Embodiment. It is a perspective view which shows the brush holding mechanism which concerns on this Embodiment provided with the base plate and the torsion spring. It is a perspective view of the regulating member concerning this embodiment. FIG. 10 is a perspective view of the regulating member viewed from a direction different from FIG. 9. FIG. 11A is a side view of the regulating member shown in FIG. 9 viewed from the B1 direction, and FIG. 11B is a side view of the regulating member shown in FIG. 9 viewed from the B2 direction. 12A is a top view of the regulating member shown in FIG. 9 viewed from the B3 direction, and FIG. 12B is a front view of the regulating member shown in FIG. 9 viewed from the B4 direction. FIG. 13A is a perspective view of the carbon brush according to the present embodiment, and FIG. 13B is a perspective view of the carbon brush viewed from a direction different from FIG. 13A. 14A is a side view of the carbon brush shown in FIG. 13A viewed from the C1 direction, and FIG. 14B is a top view of the carbon brush shown in FIG. 13B viewed from the C2 direction. is there. FIG. 15A is a perspective view of the brush holder according to the present embodiment, and FIG. 15B is a perspective view of the brush holder viewed from a direction different from FIG. 15A. 16 (a) is a top view of the brush holder shown in FIG. 15 (a) seen from the direction D1, FIG. 16 (b) is a side view of the brush holder shown in FIG. 15 (a) seen from the direction D2, FIG.16 (c) is the side view which looked at the brush holder shown to Fig.15 (a) from D3 direction. FIG. 17A is a perspective view showing a state where the regulating member is mounted on the carbon brush, and FIG. 17B is a perspective view seen from a direction different from FIG. 17A. It is the upper side figure which looked at the brush holder and regulation member of Drawing 17 (a) from E1 direction. It is a top view for demonstrating the state which inserts the carbon brush with which the control member was mounted | worn in a brush holder. It is a schematic diagram for demonstrating the brush holding mechanism of the state which inserted the carbon brush with which the limitation member was mounted | worn in the brush holder. It is a side view of the brush holding mechanism which concerns on this Embodiment. FIG. 22A is a side view showing one modified example of the regulating member according to the present embodiment, and FIG. 22B is a side view showing another modified example of the regulating member according to the present embodiment. is there. It is a perspective view which shows schematic structure of the brush holder in the brush holding mechanism which concerns on the modification of this Embodiment. It is a perspective view which shows a part of regulation member which concerns on a modification. It is a schematic diagram for demonstrating the brush holding mechanism of the state which inserted the carbon brush with which the regulating member which concerns on a modification was mounted | worn in the brush holder.

  A brush holding mechanism according to an embodiment of the present invention includes a brush that is in sliding contact with a commutator of a motor, a holder that houses the brush, and a regulating member that is inserted into the holder together with the brush. The restricting member is configured to slidably hold the brush toward the commutator and to urge the brush in the circumferential direction of the commutator with respect to the inner wall of the holder.

  According to this embodiment, the brush in the holder can be urged toward the circumferential direction of the commutator against the inner wall of the holder. Therefore, when the commutator and the brush are in sliding contact with each other, the vibration due to the force in the circumferential direction of the commutator is suppressed, which contributes to noise reduction and brush life extension.

  The regulating member may be made of a conductive material. The restricting member and the holder are configured as a power supply path for supplying power to the brush. Thereby, stable electric power feeding to a brush is attained via a control member and a holder.

  The restricting member may be configured to restrict movement of the brush in a holder that holds (accommodates) the brush and sandwiches a pair of opposing side surfaces of the brush from both sides. The restricting member connects the first plate portion contacting one of the pair of side surfaces, the second plate portion spaced apart from the other of the pair of side surfaces, and the base portion of the first plate portion and the base portion of the second plate portion. And a connecting portion. The second plate portion is configured to bend by abutting against the inner wall of the holder when a regulating member sandwiching the brush is inserted into the holder, and the brush is moved by the restoring force of the bent second plate portion. You may be comprised so that it may bias toward the other inner wall of a holder. Thereby, since the brush in a holder can be urged | biased toward the inner wall of a holder, the movement of the brush in a holder, especially the movement of the direction which cross | intersects the inner wall of a holder can be controlled.

  The regulating member is obtained by processing a conductive metal member, and the first plate portion may have a power feeding portion that contacts the holder. The second plate part may have a spring part. Thereby, a 2nd board part can be bent with a simple structure. In addition, power can be supplied from the holder to the brush through the power supply part of the first plate part. Here, the power feeding part may have a shape obtained by processing a part of the first plate part into a convex shape. In addition, the regulating member may be formed by punching a plate-like metal member in a predetermined shape, and making it into a desired shape by bending or pressing.

  The connecting portion may be a fixing portion that fixes the regulating member to the brush. Thereby, after fixing a control member to a brush, since it can insert in a holder with a control member, assembly workability can be improved.

  The second plate portion may have a region where the width gradually decreases from the connecting portion toward the tip of the second plate portion. As a result, the restoring force (elastic force) of the second plate portion can be weakened, and the brush is biased toward the inner wall of the holder by an appropriate biasing force without disturbing the sliding of the brush toward the commutator. it can.

  The second plate portion may be provided with a guided portion that slides while abutting against a guide portion provided on the holder when a regulating member sandwiching the brush is inserted into the holder. Thereby, workability | operativity at the time of inserting the control member which pinched | interposed the brush into a holder can be improved.

  When the regulating member sandwiching the brush is inserted into the holder, the regulating member may further have a locking portion that locks with a part of the holder so that the regulating member does not fall out of the holder. Thereby, it can prevent that the brush once inserted in the holder falls out again.

  The holder may be formed with a guide portion for guiding the guided portion of the second plate portion at the opening edge portion on the side where the brush is inserted. The guide portion may be formed obliquely so as to spread outward from the opening edge so that the guided portion abuts in a state where the second plate portion is not bent. As a result, the regulating member sandwiching the brush can be easily inserted into the holder without the operator bending it.

  The holder may be formed with a slit on the side surface facing the first plate portion or the second plate portion that can move without interference of the locking portion from the opening edge on the side where the brush is inserted to the middle. . The locking portion may be configured to be locked at the end portion of the slit. Thereby, it can prevent that the brush once inserted in the holder falls out again.

  An elastic member that urges the brush toward the commutator may be further provided. The elastic member may be configured to urge the central portion of the rear end portion on the opposite side to the front end portion in contact with the brush commutator. Thereby, the elastic member can urge the rear end portion of the brush at an angle close to the sliding direction of the brush.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and repeated descriptions are omitted as appropriate. Moreover, the structure described below is an illustration and does not limit the scope of the present invention at all.

(DC motor)
First, a schematic configuration of a DC motor (hereinafter referred to as “motor” as appropriate) will be described. FIG. 1 is a front view of a DC motor according to an embodiment. FIG. 2 is an exploded perspective view of the DC motor. 3 is a cross-sectional view taken along the line AA in FIG. The configuration of the motor shown in FIGS. 1 to 3 is merely an example, and the configuration of the armature according to the present embodiment is not limited to this.

  As shown in FIGS. 1 and 2, the motor 10 is configured such that a rotor 14 is accommodated in a cylindrical housing 12. The housing 12 is configured by assembling a bottomed cylindrical metal case 16 and a cylindrical resin brush housing 18. The metal case 16 also functions as a yoke that forms a magnetic circuit, and a cylindrical field magnet (simply referred to as “magnet”) 20 is fixed to the inner peripheral surface of the metal case 16 to constitute a stator. Although the magnet 20 according to the present embodiment has two poles, the number of poles and the arrangement are not limited thereto. A boss 17 is formed at the center of the bottom of the metal case 16 so as to protrude slightly outward and accommodates a bearing described later.

  The rotor 14 is configured such that an armature 24, a commutator 26, a detection magnet 28, and the like are provided on one half of one end of a shaft 22 that serves as a rotation shaft. The brush housing 18 is provided with a pair of carbon brushes 30 disposed to face the commutator 26. A connector 32 for electrical connection with an electrical component (not shown) is detachably attached to the brush housing 18.

  The brush housing 18 is assembled so as to be inserted into the metal case 16 in the state of the brush housing assembly to which the connector 32 is attached. Notches 34 and 35 are provided on the side surface near the opening end of the metal case 16, and when the brush housing assembly is assembled, predetermined positions of the connector 32 and the brush housing 18 are provided on the bases of the notches 34 and 35. Appropriate positioning is achieved by locking each of the end portions.

  After assembling the brush housing assembly in this way, the opening of the metal case 16 is sealed with the end plate 36. The end plate 36 has an outer shape substantially the same shape as the opening of the metal case 16 and is inserted and fitted into the opening. After the end plate 36 is inserted into the metal case 16, the open end of the end plate 36 is crimped inward to fix the end plate 36 to the metal case 16. A pair of flange portions 38 extending to opposite sides are provided on the peripheral edge portion of the end plate 36, and each flange portion 38 forms a mounting portion for an electrical component.

  A boss 39 is formed in the center of the end plate 36 so as to protrude slightly outward, and a slide bearing 37 made of a so-called oilless metal which is ring-shaped and impregnated with lubricating oil is press-fitted. An insertion hole is provided at the bottom of the boss portion 39 coaxially with the sliding bearing 37. The other half of the shaft 22 is exposed to the outside through the insertion hole, and is connected to the drive target via a gear or the like (not shown).

  As shown in FIG. 3, the inner space of the housing 12 is formed so as to be surrounded by the metal case 16, the brush housing 18, and the connector 32. The above-mentioned sliding bearing 37 is press-fitted into the boss portion 39 of the end plate 36, and a portion in the vicinity of the insertion hole 40 of the shaft 22 is rotatably supported. On the other hand, the boss portion 17 of the metal case 16 is provided with a bottomed cylindrical bearing holder 42 in which a spherical plain bearing 41 which is a plain bearing and has a spherical outer shape is coaxially inserted and fitted. . The spherical plain bearing 41 is press-fitted into one end portion of the shaft 22. A convex portion 43 having a triangular cross section is provided in the center of the bottom portion of the bearing holder 42, and by engaging with a concave portion 44 of the same shape provided at the bottom portion of the boss portion 17, rotation around the axis is prevented. Yes.

  The armature 24 includes a core 46 press-fitted into the shaft 22 and a winding 48 wound around the core 46, and the outer peripheral surface of the core 46 is separated from the inner peripheral surface of the magnet 20 with a predetermined clearance ( They are arranged opposite each other with a magnetic gap.

  Between the armature 24 and the sliding bearing 37 in the shaft 22, a commutator 26, a detection magnet 28, and a bush 50 are arranged in parallel from the armature 24 side. The commutator 26 has a cylindrical shape and is press-fitted into the shaft 22 at a position where the connector 32 is opposed to the carbon brush 30 when the connector 32 is assembled to the metal case 16. A cylindrical brush holder 31 is fixed to the brush housing 18, and the carbon brush 30 is inserted into and supported by the brush holder 31.

  The detection magnet 28 has a cylindrical shape whose outer diameter is slightly smaller than that of the commutator 26, and is inserted through the shaft 22 so as to contact the commutator 26 in the axial direction. A Hall element 52 is disposed on the lower surface of the connector 32, and when the connector 32 is assembled to the metal case 16, the Hall element 52 is disposed to face the detection magnet 28. Since the detection magnet 28 is configured to be slightly smaller than the commutator 26, the detection magnet 28 is prevented from interfering with the carbon brush 30 when the shaft 22 is inserted into the brush housing 18 from the other end side. Further, the detection magnet 28 is made larger in a smaller range than the commutator 26 so that it can be disposed close to the Hall element 52.

  The detection magnet 28 is magnetized into two poles so that the N pole and the S pole appear alternately on the outer peripheral surface with rotation, and the Hall element 52 has the magnetic poles accompanying the rotation of the detection magnet 28. A change (boundary) is detected and a pulse signal is output. By acquiring the number of pulse signals in a predetermined period, the number of rotations of the motor 10 can be detected. In the present embodiment, the detection magnet 28 is two-pole magnetized, but may be set to other even number of poles such as quadrupole magnetisation.

  A concave portion 54 having a square cross section is provided on the surface of the detection magnet 28 facing the bush 50. On the other hand, the bush 50 has a stepped column shape having an outer shape complementary to the concave portion 54. The bush 50 is press-fitted into the shaft 22 so that the tip end of the bush 50 is fitted into the recess 54, and as a result, the rotation of the detection magnet 28 relative to the shaft 22 is prevented. The bush 50 is made of a magnetic material such as iron, and also functions as a back yoke that stabilizes the magnetic force of the detection magnet 28.

(Brush housing)
FIG. 4 is a top view showing a main part of the brush housing according to the present embodiment. FIG. 5 is a perspective view showing a main part of the brush housing according to the present embodiment. FIG. 6 is a perspective view showing a main part of the brush housing as seen from a direction different from that in FIG. 4 to 6 show a part of the brush housing.

  As shown in FIG. 4, the brush housing 18 has a bottomed cylindrical shape, and, like the metal case 16, corners of a square cross section are formed in a curved shape. A circular hole through which the shaft 22 can be inserted is formed in the center of the brush housing 18 in the axial direction, and various functional parts are optimally arranged around the hole so as to effectively use the space.

  That is, a pair of cylindrical brush holders 31 are fixed to the corners of the brush housing 18 at the lower left and right in FIG. 4 via the base plate 33 so as to form 90 degrees in the circumferential direction. The carbon brush 30 is slidably accommodated in a cylindrical internal space formed by the brush holder 31 and the base plate 33. The brush holder 31 has an elongated cylindrical portion made of a conductive metal and has a rectangular cross section, and is disposed so as to extend along the radial direction from the axial center of the brush housing 18. Details of the shape of the brush holder 31 will be described later.

  The carbon brush 30 has a long prismatic shape having a rectangular cross section, and is slidably inserted into and supported by the brush holder 31. Thereby, when the metal case 16, the rotor 14, and the brush housing assembly are assembled, the carbon brush 30 is disposed so as to extend on a line connecting the corner of the brush housing 18 and the axial center of the commutator 26. Become so.

  A torsion spring 70 is disposed in the space between the brush holder 31 and the side surface. The winding portion 71 of the torsion spring 70 is supported by being inserted into a boss portion 68 disposed close to the side surface portion of the brush housing 18, and one end portion 72 extending from the winding portion 71 is disposed behind the carbon brush 30. It abuts on the end. The other end 73 extending from the winding part 71 is locked to a part of the brush holder 31. The torsion spring 70 accumulates an urging force at the winding portion 71, and the one end portion 72 transmits the urging force to the carbon brush 30 and urges the commutator 26.

(Brush holding mechanism)
FIG. 7 is a perspective view showing the brush holding mechanism according to the present embodiment. FIG. 8 is a perspective view showing a brush holding mechanism according to the present embodiment including a base plate and a torsion spring. The brush holding mechanism 100 according to the present embodiment includes a columnar carbon brush 30 that is in sliding contact with the commutator 26 of the motor 10, a brush holder 31 that houses the carbon brush 30, a regulating member 56 that will be described later, and the carbon brush 30. And a base plate 33 into which the legs of the brush holder 31 are inserted. Thereby, the movement of the carbon brush 30 in the brush holder 31 in a predetermined direction, in particular, the movement in the direction intersecting the inner wall of the brush holder 31 can be restricted.

  The shape and arrangement of the torsion spring 70, which is an elastic member, is set so as to urge the central portion 30b1 of the rear end portion 30b opposite to the front end portion 30a that contacts the commutator 26 of the carbon brush 30. Thereby, the torsion spring 70 can bias the rear end portion 30 b of the carbon brush 30 in a direction close to the sliding direction X of the carbon brush 30.

(Regulatory member)
FIG. 9 is a perspective view of a regulating member according to the present embodiment. FIG. 10 is a perspective view of the regulating member viewed from a direction different from FIG. 9. FIG. 11A is a side view of the regulating member shown in FIG. 9 viewed from the B1 direction, and FIG. 11B is a side view of the regulating member shown in FIG. 9 viewed from the B2 direction. 12A is a top view of the regulating member shown in FIG. 9 viewed from the B3 direction, and FIG. 12B is a front view of the regulating member shown in FIG. 9 viewed from the B4 direction.

  In the present embodiment, the regulating member 56 is a member that regulates the movement of the carbon brush 30 in the brush holder 31 that houses the carbon brush 30. The regulating member 56 is configured to sandwich a pair of opposing side surfaces of the carbon brush 30 from both sides, and a first plate portion 58 that contacts one of the pair of side surfaces and a first plate part 58 that is spaced apart from the other of the pair of side surfaces. And a connecting portion 62 that connects the base portion 58a of the first plate portion 58 and the base portion 60a of the second plate portion 60. The 2nd board part 60 is processed into the shape bent by external force, and functions as a leaf | plate spring part which gave spring property. Thereby, a part of 2nd board part 60 can be bent with a simple structure. The second plate portion 60 is formed with a guided portion 60b that is guided by a guide portion of a brush holder described later.

  The restriction member 56 is obtained by processing a conductive metal member. For example, the restricting member 56 is manufactured by punching a plate-shaped metal member in a predetermined shape and forming it into a desired shape by bending or pressing. Alternatively, a plurality of members having a predetermined shape may be combined into one member by welding or bonding. The first plate portion 58 has a power feeding portion 58 b that comes into contact with the brush holder 31. The power feeding part 58b is a part formed so that a part of the first plate part 58 protrudes outwardly by pressing or the like.

(brush)
FIG. 13A is a perspective view of the carbon brush according to the present embodiment, and FIG. 13B is a perspective view of the carbon brush viewed from a direction different from FIG. 13A. 14A is a side view of the carbon brush shown in FIG. 13A viewed from the C1 direction, and FIG. 14B is a top view of the carbon brush shown in FIG. 13B viewed from the C2 direction. is there.

  As shown in FIGS. 13 and 14, the carbon brush 30 as a whole is a substantially rectangular parallelepiped and columnar. The carbon brush 30 is manufactured by compressing and heating carbon powder, for example. The carbon brush 30 according to the present embodiment has a wide width W1 near the front end portion 30a and a narrow width W2 near the rear end portion 30b.

  The regulation member 56 is attached to the narrow region R1 close to the rear end 30b. The side surface 30c of the region R1 is in contact with the first plate portion 58 of the restriction member 56 in a state where the restriction member 56 is mounted. A concave groove 30e that is biased by one end 72 of the torsion spring 70 is formed in the width direction in the center 30b1 of the rear end 30b. A pair of protrusions 30f that engage with the connecting portion 62 are formed on the upper and lower sides of the recessed groove 30e so that the mounted regulating member 56 is not displaced in the vertical direction.

(Brush holder)
FIG. 15A is a perspective view of the brush holder according to the present embodiment, and FIG. 15B is a perspective view of the brush holder viewed from a direction different from FIG. 15A. 16 (a) is a top view of the brush holder shown in FIG. 15 (a) seen from the direction D1, FIG. 16 (b) is a side view of the brush holder shown in FIG. 15 (a) seen from the direction D2, FIG.16 (c) is the side view which looked at the brush holder shown to Fig.15 (a) from D3 direction.

  The brush holder 31 is formed, for example, by punching a plate-like conductive member such as copper or brass, which is a conductive member, into a predetermined shape and bending it. The brush holder 31 has three leg portions 31a1 to 31a3 inserted into the base plate 33. Further, the brush holder 31 guides the guided portion 60b (see FIGS. 9 to 12) of the second plate portion 60 of the regulating member 56 to the edge portion of the opening 31b on the side where the carbon brush 30 is inserted. A portion 31c is formed. Further, the guide portion 31c is formed obliquely so as to spread outward from the edge portion of the opening portion 31b so that the guided portion 60b abuts in a state where the second plate portion 60 is not bent.

  Further, the brush holder 31 has a slit 31e formed on a side surface 31d of the restricting member 56 that faces the first plate portion 58 so that the engaging portion 58c of the restricting member 56 can move without interference. The slit 31e is formed partway from the opening 31b toward the opposite opening. In the brush holder 31 according to the present embodiment, a part of the side surface 31d also serves as the leg portions 31a1 and 31a2, and a part of the side surface 31f that faces the side surface 31d also serves as the leg portion 31a3. The aforementioned guide portion 31c is formed from the edge portion of the side surface 31f.

  The brush holder 31 has an upper surface 31g that connects the side surface 31d and the side surface 31f. The upper surface 31g is provided with a hook-shaped locking portion 31h to which the other end portion 73 of the torsion spring 70 is locked.

(Brush holding mechanism)
Next, a brush holding mechanism using the carbon brush 30, the brush holder 31, and the regulating member 56 will be described. FIG. 17A is a perspective view showing a state where the regulating member is mounted on the carbon brush, and FIG. 17B is a perspective view seen from a direction different from FIG. 17A. FIG. 18 is a top view of the brush holder and the regulating member of FIG. 17A viewed from the E1 direction.

  When the restricting member 56 is attached to the carbon brush 30, the restricting member 56 is fixed to the carbon brush 30 by fitting the connecting portion 62 to the rear end portion 30 b of the carbon brush 30. That is, the connecting part 62 functions as a fixed part. Thereby, since the carbon brush 30 can be inserted into the brush holder 31 together with the regulating member 56 after the regulating member 56 is fixed to the carbon brush 30, the assembly workability can be improved.

  The first plate portion 58 of the restricting member 56 is formed by bending the distal end 58d of the free end outward. Accordingly, it is possible to prevent the carbon brush 30 from being scraped by the first plate portion 58 when the regulating member 56 is attached to the carbon brush 30.

  FIG. 19 is a top view for explaining a state in which the carbon brush on which the regulating member is mounted is inserted into the brush holder. FIG. 20 is a schematic diagram for explaining the brush holding mechanism in a state where the carbon brush on which the regulating member is mounted is inserted into the brush holder. FIG. 21 is a side view of the brush holding mechanism according to the present embodiment.

  As shown in FIG. 19, the second plate portion 60 slides while abutting against a guide portion 31 c provided on the brush holder 31 when the regulating member 56 sandwiching the carbon brush 30 is inserted into the brush holder 31. A guided portion 60b is provided at the tip. When the regulating member 56 is gradually inserted into the brush holder 31, the second plate portion 60 is gradually bent by the inward displacement of the guided portion 60b while being guided by the guide portion 31c. Thereby, the regulating member 56 sandwiching the carbon brush 30 can be easily inserted into the brush holder 31 without the operator bending it. That is, it is not necessary to bend the second plate portion 60 in advance and insert it into the brush holder 31, and workability when inserting the regulating member 56 sandwiching the carbon brush 30 into the brush holder 31 can be improved.

  When the regulating member 56 sandwiching the carbon brush 30 is inserted to a predetermined position of the brush holder 31, the second plate portion 60 is configured to bend by contacting the inner wall 31 k of the brush holder 31 as shown in FIG. 20. ing. The restricting member 56 is configured to urge the carbon brush 30 toward the other inner wall 31 m of the brush holder 31 by the restoring force of the bent second plate portion 60.

  Thus, according to the regulating member 56 according to the present embodiment, the carbon brush 30 in the brush holder 31 can be urged toward the inner wall 31m of the brush holder 31, so the movement of the carbon brush 30 in the brush holder 31 In particular, the movement in the direction intersecting the inner wall 31m of the brush holder 31 can be restricted. At this time, since the power feeding portion 58b of the first plate portion 58 is pressed against the inner wall 31m, the brush holder 31 and the power feeding portion 58b always come into stable contact, and the base plate 33 passes through the brush holder 31 and the regulating member 56. Thus, stable power supply to the carbon brush 30 becomes possible.

  Conventionally, since the contact point between the carbon brush and the brush holder is unstable, the base plate and the carbon brush are connected by a pigtail wire to ensure stable power feeding. This eliminates the need for power supply using pigtail wires, eliminates the need to connect one end of the pigtail wire to a carbon brush, and the other end of the pigtail wire to the terminal, reducing component costs and manufacturing costs. It becomes possible.

  In addition, the 2nd board part 60 has the area | region where a width | variety becomes narrow gradually toward the to-be-guided part 60b of the front-end | tip from the connection part 62, as shown to Fig.11 (a). As a result, the restoring force (elastic force) of the second plate portion 60 can be weakened, and the carbon brush 30 is attached to the brush holder by an appropriate biasing force without disturbing the sliding of the carbon brush 30 toward the commutator 26. The inner wall 31 can be biased toward the inner wall 31m. In addition, since it is the electric power feeding part 58b which is a part of 1st board part 58 that contacts the inner wall 31m, contact resistance can be reduced.

  In addition, the restricting member 56 is engaged with a part of the brush holder 31 so that the restricting member 56 does not fall out of the brush holder 31 when inserted into the brush holder 31 with the carbon brush 30 interposed therebetween. It has a portion 58c. As shown in FIG. 21, the locking portion 58c is configured to be locked by a terminal portion 31e1 of the slit 31e. Thereby, it is possible to prevent the carbon brush 30 once inserted into the brush holder 31 from being pushed in as it is and coming off again.

  As described above, the regulating member 56 according to the present embodiment holds the carbon brush 30 slidably toward the commutator 26 and holds the carbon brush 30 with respect to the inner wall of the brush holder 31 in the circumferential direction of the commutator. It is configured to be energized. Thereby, the carbon brush 30 in the brush holder 31 can be urged toward the circumferential direction of the commutator 26 against the inner wall of the brush holder 31. Therefore, when the commutator 26 and the carbon brush 30 are in sliding contact, the carbon brush 30 is prevented from vibrating due to the force in the circumferential direction of the commutator 26, which contributes to noise reduction and the like.

  FIG. 22A is a side view showing one modified example of the regulating member according to the present embodiment, and FIG. 22B is a side view showing another modified example of the regulating member according to the present embodiment. is there. In addition, description is abbreviate | omitted suitably about the structure similar to the above-mentioned control member.

  The restriction member 74 shown in FIG. 22A is configured to sandwich a pair of opposing side surfaces of the carbon brush 30 from both sides, and includes a first plate portion 76 that contacts one of the pair of side surfaces, It has the 2nd board part 78 spaced apart from the other of the side surface, and the connection part 80 which connects the base part 76a of the 1st board part 76, and the base part 78a of the 2nd board part 78. FIG. The 2nd board part 78 is processed into the shape which bends with external force, and functions as a leaf | plate spring part which gave spring property. Thereby, a part of 2nd board part 78 can be bent with a simple structure. The second plate portion 78 is formed with a guided portion 78b guided by the guide portion 31c of the brush holder 31 described above. The second plate portion 78 has a larger (longer) contact portion 78c that contacts the inner wall of the brush holder 31 than the restriction member 56 shown in FIG. Therefore, it is possible to increase the urging force when the carbon brush 30 to which the regulating member 74 is attached is pressed against the inner wall of the brush holder 31. Further, the carbon brush 30 is less likely to tilt in the brush holder 31.

  The restricting member 82 shown in FIG. 22B is configured to sandwich a pair of opposing side surfaces of the carbon brush 30 from both sides, and includes a first plate portion 84 in contact with one of the pair of side surfaces, It has the 2nd board part 86 spaced apart from the other of the side surface, and the connection part 88 which connects the base part 84a of the 1st board part 84, and the base part 86a of the 2nd board part 86. FIG. The 2nd board part 86 is processed into the shape bent by external force, and functions as a leaf | plate spring part which gave spring property. Thereby, a part of 2nd board part 86 can be bent with a simple structure. The second plate portion 86 is formed with two guided portions 86b guided by the guide portion 31c of the brush holder 31 described above. Compared with the regulating member 56 shown in FIG. 11, the second plate portion 86 has two abutting portions 78 c that abut against the inner wall of the brush holder 31. For this reason, the carbon brush 30 to which the regulating member 82 is attached is not easily tilted in the brush holder 31.

  FIG. 23 is a perspective view showing a schematic configuration of a brush holder in a brush holding mechanism according to a modification of the present embodiment. FIG. 24 is a perspective view showing a part of a regulating member according to a modification. FIG. 25 is a schematic diagram for explaining the brush holding mechanism in a state in which the carbon brush on which the regulating member according to the modification is mounted is inserted into the brush holder.

  The restriction member according to the modified example is separated into a first restriction member 90 and a second restriction member 92. The first regulating member 90 has a function of regulating the movement of the brush within the brush holder. The second restricting member 92 has a power feeding function from the brush holder 31 to the carbon brush 30. The second restricting member 92 has substantially the same shape as the corresponding portion of the restricting member 74 described above.

  The first restricting member 90 has a shape obtained by bending a plate-like member, and a fixing portion 90a fixed to the guide portion 31c of the brush holder 31 and an elastic portion on the opposite side of the fixing portion 90a across the bending portion 90b 90c. The elastic portion 90c includes a first urging portion 90d at an end portion and a second urging portion 90e obtained by cutting and raising a part of the elastic portion 90c.

  When the carbon brush 30 fitted with the second restricting member 92 is inserted to a predetermined position of the brush holder 31 where the first restricting member 90 is fixed to the guide portion 31c, as shown in FIG. 25, the first urging portion 90d. The second urging portion 90e is configured to bend by contacting the side surface 30d of the carbon brush 30. And the 1st control member 90 is comprised so that the carbon brush 30 may be urged | biased toward the other inner wall 31m of the brush holder 31 with the restoring force of the 1st urging | biasing part 90d and the 2nd urging | biasing part 90e which bent. Has been. At this time, a stable conduction between the carbon brush 30 and the brush holder 31 is realized by the power supply portion 58b of the second regulating member 92 attached to the carbon brush 30 coming into contact with the inner wall 31m.

  As described above, the present invention has been described with reference to the above-described embodiment. However, the present invention is not limited to the above-described embodiment, and the present invention can be appropriately combined or replaced with the configuration of the embodiment. It is included in the present invention. In addition, it is possible to appropriately change the combination and processing order in the embodiment based on the knowledge of those skilled in the art and to add various modifications such as various design changes to the embodiment. The described embodiments can also be included in the scope of the present invention.

  10 motor, 12 housing, 14 rotor, 16 metal case, 18 brush housing, 20 magnet, 22 shaft, 24 armature, 26 commutator, 30 carbon brush, 30a front end, 30b rear end, 30c side, 30e concave groove 30f ridge, 31 brush holder, 31b opening, 31c guide, 31d side, 31e slit, 31f side, 31g top, 31h locking part, 31k, 31m inner wall, 56 regulating member, 58 first plate, 58a base part, 58b feeding part, 58c locking part, 58d tip, 60 second plate part, 60a base part, 60b guided part, 62 coupling part, 70 torsion spring, 71 winding part, 72 one end part, 73 other end part 100 Brush holding mechanism .

Claims (11)

A brush in sliding contact with the motor commutator;
A holder for accommodating the brush;
The brush with being inserted into the holder, and a regulating member that move along with said brush within said holder,
The restriction member is configured to slidably hold the brush toward the commutator and to urge the brush in the circumferential direction of the commutator with respect to the inner wall of the holder. Retention mechanism. The regulating member is made of a conductive material,
The brush holding mechanism according to claim 1, wherein the restriction member and the holder are configured as a power supply path for supplying power to the brush. The regulating member is configured to regulate movement of the brush in a holder that accommodates the brush, and to sandwich a pair of opposite side surfaces of the brush from both sides,
A first plate having a first base in contact with one of the pair of side surfaces;
A second base part having a second base part in contact with the other of the pair of side surfaces, and a separating part spaced apart from the other of the pair of side surfaces from the second base part toward the tip ,
Anda connecting portion for connecting the second base portion and the first base portion,
The spacing portion is a leaf spring portion that bends by abutting against the inner wall of the holder when a regulating member sandwiching the brush is inserted into the holder,
By the restoring force of the plate spring portion, the brush retention mechanism of claim 1 or 2, characterized in that biases the brush in addition to the inner wall of the holder. The regulating member is a processed conductive metal member,
The first plate portion has a power feeding portion that contacts the holder,
The brush holding mechanism according to claim 3, wherein the second plate portion has a spring portion.   5. The brush holding mechanism according to claim 3, wherein the connecting portion is a fixing portion that fixes the restricting member to the brush.   The brush holding according to any one of claims 3 to 5, wherein the second plate portion has a region in which the width gradually decreases from the connecting portion toward the tip of the second plate portion. mechanism.   The second plate portion is provided with a guided portion that slides in contact with a guide portion provided on the holder when a regulating member sandwiching a brush is inserted into the holder. The brush holding mechanism according to any one of claims 3 to 6.   8. The device according to claim 3, further comprising an engaging portion that engages with a part of the holder so that the restricting member does not fall out of the holder when the restricting member sandwiching the brush is inserted into the holder. The brush holding mechanism according to claim 1. The holder has a guide portion that guides the guided portion of the second plate portion at an opening edge portion on the side where the brush is inserted,
The said guide part is formed diagonally so that it may spread outward from the said opening edge part so that the said to-be-guided part may contact | abut in the state in which the said 2nd board part is not bent. 8. The brush holding mechanism according to 7. The holder has a slit on the side surface facing the first plate portion or the second plate portion that can move without interference of the locking portion from the opening edge on the side where the brush is inserted to the middle. Has been
The brush holding mechanism according to claim 8, wherein the locking portion is configured to be locked at an end portion of the slit. An elastic member for urging the brush toward the commutator;
11. The brush holding mechanism according to claim 9, wherein the elastic member is configured to urge a central portion of a rear end portion on a side opposite to a front end portion in contact with the commutator of the brush. .

Images