WO2008001689A1

WO2008001689A1 - Motor with brush

Info

Publication number: WO2008001689A1
Application number: PCT/JP2007/062599
Authority: WO
Inventors: Keiichi Hosoi; Masato Iwata; Masaki Taguchi
Original assignee: Mitsuba Corporation
Priority date: 2006-06-26
Filing date: 2007-06-22
Publication date: 2008-01-03
Also published as: JPWO2008001689A1; JP5044552B2

Abstract

A yoke insertion section (28) is formed in an axially projecting manner on a brush holder stay (21). A magnet (8) and a magnet holder (9) are installed on a yoke inner peripheral surface (7a). A rib (30) is formed on the outer peripheral surface of the yoke insertion section (28), and the brush holder stay (21) is fitted into a yoke (7) with slight interference. A stay pressing claw (36) is formed at the magnet holder (9). The yoke insertion section (28) is held between the stay pressing claw (36) and the yoke inner peripheral surface (7a), and the brush holder stay (21) is fixed in the yoke (7). A flat surface (37) is formed on the inner peripheral surface of the yoke insertion section (28), and the stay pressing claw (36) comes into contact with the flat surface (37).

Description

Specification

Motor with brush

Technical field

TECHNICAL FIELD [0001] The present invention relates to an electric motor using a brush, and more particularly to a fixing structure of a brush holder stage that houses and holds a brush.

Background art

Conventionally, in an electric motor with a brush, a structure in which a member made of a synthetic resin called a brush holder stay is arranged in the motor in order to accommodate and hold the brush. A brush holder made of metal is attached to the brush holder stage, and the brush is accommodated in this brush holder. The brush holder stage is fixed to the motor yoke, end bracket, etc., and the following two methods are generally used for the fixing structure. 10 and 11 are explanatory diagrams showing a fixing structure of a brush holder stage in a conventional motor with a brush. FIG. 10 shows a first method (Patent Document 1), and FIG. 11 shows a second method (Patent Document). The fixed structure according to 2) is shown.

[0003] First, in the first method, the brush holder stage is fixed to the end bracket by a fixing member such as a rivet. For example, in the motor of FIG. 10, the brush holder stage 51 is fixed to the end bracket 53 by a rivet 52. A brush 54 is accommodated and held in the brush holder stage 51, and is attached to the end of a motor yoke (not shown) together with the end bracket 53.

[0004] Next, in the second method, the brush holder stage is sandwiched between the yoke and the end bracket. For example, in the motor shown in FIG. 11, the brush holder stage 55 is sandwiched between the yoke 56 and the end bracket 57. A brush 58 is received and held in the brush holder stage 55, and is fixed between the yoke end bracket when the end bracket 57 is attached to the yoke 56.

Patent Document 1: Japanese Utility Model Publication No. 61-129453

Patent Document 2: Japanese Patent Laid-Open No. 2003-9456

Disclosure of the invention Problems to be solved by the invention

However, in the first fixing method as shown in FIG. 10, a member (here, rivet 52) for fixing brush holder stage 51 and end bracket 53 is required separately. For this reason, the number of parts increases, and man-hours for fixing the brush holder step 51 are required, which causes a problem of increasing costs.

On the other hand, the second fixing method as shown in FIG. 11 does not require a separate fixing member, but over time, the synthetic resin brush holder stage 55 creeps and loosens the attachment. May cause play. In particular, those used in the vicinity of a heat source such as an engine, such as a motor for a fan for cooling a car radiator, are prone to heat shrinkage and creep deformation, and measures against mounting backlash have been required. In addition, in-vehicle motors are constantly subjected to vibration during operation, so if play occurs due to creep deformation, there is also a problem with durability.

[0007] An object of the present invention is to fix the brush holder stay in the motor without separately using a fixing member such as a rivet, and to cause mounting play even if the brush holder stays deformed with time. There is no need to provide a fixing structure for the brush holder stage.

Means for solving the problem

[0008] A motor with a brush according to the present invention includes a cylindrical yoke, a plurality of magnets mounted in the yoke, and a magnet holder that is disposed between the magnets and holds the magnet in a predetermined position. A stator fixed to the rotating shaft and rotatably disposed in the stator, a commutator fixed to the rotating shaft and electrically connected to the armature, and a brush slidably contacting the commutator; A brush motor attached to the yoke and having a brush holder section having a brush accommodating portion for accommodating and holding the brush, the brush motor being in contact with the brush holder stage, The magnet holder is provided with a brush holder stage fixing portion capable of holding one in the motor.

In the present invention, a brush holder stay fixing portion is provided in a magnet holder that is also present in a conventional motor, and the brush holder stage fixing portion is brought into contact with the brush holder stage, so that the brush Hold the holder stage in the motor. This increases the number of parts Therefore, the brush holder stage can be fixed in the yoke without backlash, and the product cost can be reduced. Further, since the brush holder stage is not fixed between the yoke and the end bracket, the brush holder stage is not loosely attached due to creep deformation or the like, and the durability can be improved.

[0010] In the motor with brush, an extending portion that extends along the axial direction and is inserted into the yoke is provided in the brush holder stage, and the brush holder stage fixing portion is brought into contact with the extending portion. The extending portion may be sandwiched between the brush holder stage fixing portion and the yoke inner peripheral surface.

[0011] Further, in the motor with a brush according to the present invention, a protrusion that contacts the inner peripheral surface of the yoke may be provided on the outer peripheral surface side of the extending portion. Thus, by providing the protrusion on the outer peripheral surface of the extended portion, when the brush holder stage is assembled into the yoke, when the extended portion is inserted into the yoke, the protrusion comes into contact with the inner peripheral surface of the yoke, The brush holder stage is lightly press-fitted into the yoke. For this reason, even if there is a slight gap between the brush holder stage and the yoke, the looseness is absorbed by the protrusions, and the brush holder stage is attached to the yoke without backlash. In addition, since the brush holder stage is temporarily fixed to the yoke during the mounting operation, the assembling property can be improved.

[0012] On the other hand, in the motor with a brush according to the present invention, an extension portion that extends along the axial direction and is inserted into the yoke is provided in the brush holder stage, and the brush holder stage fixing portion is provided as the extension portion. It may be in contact with the outer peripheral surface of the part.

[0013] Further, in the motor with a brush according to the present invention, a flat portion may be provided on the side of the extending portion that contacts the brush holder stage fixing portion. In this case, the plane portion may be arranged at a position corresponding to the advance angle setting of the motor. In this way, by providing a flat portion on the inner peripheral surface of the extending portion and bringing the brush holder stay fixing portion into contact therewith, the brush holder stay fixing portion and the extending portion can be brought into line contact. Improved retention and stability

[0014] In the brush motor of the present invention, the brush holder stage is formed with a peripheral wall fitted to the inner peripheral portion of the yoke end surface, and formed on the inner peripheral side of the peripheral wall in the central direction. A contact surface extending by force, and the brush holder stay fixing portion is connected to the peripheral wall and the contact surface. Either one or both of them may be brought into contact.

[0015] Further, in the motor with a brush according to the present invention, the brush holder stage fixing portion may be made to abut on the brush holder stage. Thereby, for example, even if creep deformation occurs in the extended portion or the like, the brush holder stay is still held in the motor by the elasticity of the brush holder stay fixing part, and the attachment is not loosened. Further, the brush holder stage fixing part may be formed in a cantilevered plate spring shape, and an adjustment hole for adjusting the elastic force of the brush holder stage fixing part may be provided in the center thereof.

The invention's effect

[0016] According to the brushed motor of the present invention, the magnet holder mounted in the yoke is provided with the brush holder stage fixing portion that contacts the brush holder stage and can hold the brush holder stage in the motor. The brush holder stage can be held in the motor by using a magnet holder that is also present in a conventional motor. For this reason, the brush holder stage without increasing the number of parts can be fixed in the yoke without backlash, and the product cost can be reduced. Further, in the brush motor of the present invention, it is not necessary to fix the brush holder stage between the yoke and the end bracket, so that the attachment of the brush holder stage is loosened due to thermal contraction or tape deformation. It can be prevented, and durability can be improved.

Brief Description of Drawings

FIG. 1 is a cross-sectional view showing a configuration of a brushed motor that is Embodiment 1 of the present invention.

FIG. 2 is an explanatory view showing a configuration of a brush holder stage.

FIG. 3 is an exploded perspective view showing a configuration of a stay fixing portion.

FIG. 4 is an enlarged sectional view of a stay fixing portion.

FIG. 5 is a front view of a stay fixing portion.

FIG. 6 is a plan view of a magnet honoreda.

FIG. 7 is an explanatory view showing a contact position with a flat portion of the stay pressing claw.

FIG. 8 is an explanatory view showing a configuration of a stay fixing portion of a brushed motor that is Embodiment 2 of the present invention.

FIG. 9 is an explanatory view showing the structure of the stay fixing portion of the brushed motor that is Embodiment 3 of the present invention. It is.

FIG. 10 is an explanatory view showing a fixing structure (first method) of a brush holder stage in a conventional motor with a brush.

FIG. 11 is an explanatory view showing a fixing structure (second method) of a brush holder stage in a conventional motor with a brush.

Explanation of symbols

1 Motor 2 Stator

3 Armature 4 Brush

5 Rotating shaft 6 Cooling fan

7 Yoke 7a Yoke inner surface

7b Step 8 magnet

9 Magnet Honoreda 11 End bracket

12a, 12b Bearing 13 core

14 Koinole 15 Commutator

16 Commutator piece 17 Brush holder

18 Spring 21 Brush holder stain

22 Body 23 Brush housing

24 Pigtail 25 Conductive plate

26 Terminal 27 Connection terminal

28 Yoke insert piece (extension part) 28a, 28b Yoke insert piece

29 Outer peripheral surface 30 Ribs (projections)

31a, 31b Stay fixing part 32 fixing hole

33 Magnet holding claw 34 Magnet holding claw

35 middle nails

36 Stay holding claw (Brush holder bracket fixing part)

36a Tip 36b Elastic force adjustment hole

37 Plane part 37a Plane part

38 motor 39 Stay holding claw (Brush holder bracket fixing part)

39a Tip 39b Plane

41 Yoke insert piece 41b Yoke insert piece

42 Holding claw insertion part 43 Flat part

44 Motor

45 Stay holding claw (Brush holder bracket fixing part)

45a Bend 45b Extension

46 46a Inner rim

47 Abutment surface 48 Stay mounting groove

51 Brush holder stage 52 Jibet

53 Work 54 Brush

55 Brush holder stage 56 Yoke

57 58 58 brush

F

1 ~ F Elastic holding force

Four

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Example 1

FIG. 1 is a cross-sectional view showing a configuration of a brushed motor that is Embodiment 1 of the present invention. A motor 1 in FIG. 1 is a DC motor with a brush in which an armature 3 is rotatably arranged in a stator 2, and supplies current to the armature 3 through the brush 4. The motor 1 is used as a drive source for a fan for cooling a car radiator. A cooling fan 6 is attached to the rotating shaft 5 of the motor 1, and when the motor 1 is driven, the cooling fan 6 rotates. The cooling air generated with the rotation of the cooling fan 6 is supplied to a radiator (not shown) to cool the radiator.

The stator 2 includes a bottomed cylindrical yoke 7 and a plurality (four in this case) of magnets 8 fixed to the yoke inner peripheral surface 7a. Four metal magnet holders 9 are fixed to the yoke inner peripheral surface 7a. The magnet holders 9 are equally arranged along the circumferential direction, and each magnet 8 is placed at a predetermined position on the yoke inner peripheral surface 7a by the magnet holder 9. Arrangement 'fixed'. On the other hand, the left end of the yoke 7 in the drawing is open, and the end bracket 11 is attached to the opening. Bearings 12a and 12b are respectively attached to the center of the end bracket 11 and the center of the right end of the yoke 7 in the drawing!

The armature 3 includes a core 13 formed by laminating a plurality of steel plates, and a coil 14 mounted on the core 13. The core 13 is fixed to the rotating shaft 5, and the rotating shaft 5 is rotatably supported by bearings 12a and 12b. A commutator 15 is provided on one side of armature 3 (on the left side in Fig. 1). The commutator 15 is also fixed to the rotating shaft 5, and a metal commutator piece 16 is disposed around the commutator 15. The commutator piece 16 is electrically connected to the coil 14, and the brush 4 is in sliding contact with the surface thereof. The brush 4 is accommodated and held in the brush holder 17 so as to be movable in the radial direction, and is urged by the spring 18 with a force in the central direction. The brush holder 17 is fixed to a brush holder stage 21 made of synthetic resin.

FIG. 2 is an explanatory view showing the configuration of the brush holder stage 21, and the center is a front view thereof. The brush holder stage 21 includes a main body portion 22 formed of a synthetic resin and four brush housing portions 23 provided on the main body portion 22. A metal brush holder 17 fixed to the main body part 22 is attached to the brush housing part 23. The brush holder 17 is equally arranged in the circumferential direction, and the brush 4 is accommodated therein so as to be movable along the radial direction. A big tail 24 is attached to the brush 4, and the big tail 24 is connected to a conductive plate 25 attached to the main body 22. The conductive plate 25 is electrically connected to a connection terminal 27 of a terminal portion 26 provided on the outer periphery of the main body portion 22.

[0024] In the vicinity of the outer periphery of the main body 22, two yoke insertion pieces (extension portions) 28 (28a, 28b) protrude in the extending direction (axial direction) of the rotary shaft 5! / RU The yoke insertion piece 28a is provided at the same position as the terminal portion 26, and the yoke insertion piece 28b is provided at a position facing the terminal portion 26 by 180 °. The yoke insertion piece 28 is inserted into the yoke 7 when the brush holder stage 21 is assembled to the yoke 7. The outer circumferential surface 29 of the yoke insertion piece 28 is a circumferential surface, and is formed to have a slightly smaller diameter than the inner circumferential surface 7a of the yoke. The outer peripheral surface 29 is provided with ribs (protrusions) 30 that are formed so as to protrude in the radial direction. The rib 30 has a triangular cross section. As shown in the lower right diagram of FIG. 2 (cross section A—A), the yoke insertion piece 28 has a base side to a base side. The height is gradually getting higher. In motor 1, the maximum height at the base of rib 30 is set to 0.4 mm.

In the motor 1, when the brush holder stage 21 is assembled to the yoke 7, when the yoke insertion piece 28 is inserted into the yoke 7, the rib 30 comes into contact with the yoke inner peripheral surface 7 a. That is, in the motor 1, the brush holder stage 21 is lightly press-fitted into the yoke 7 such that the rib 30 is in contact with the yoke inner peripheral surface 7a. For this reason, even if there is a slight gap between the brush holder stage 21 and the yoke 7, the looseness is absorbed by the rib 30, and the brush holder stage 21 is attached to the yoke 7 without backlash. Therefore, the play in the radial direction of the brush holder stage 21 is suppressed, and the durability is improved. In particular, it is possible to improve the durability of in-vehicle motors used in an environment with a lot of vibration. Further, since the brush holder step 21 is temporarily fixed to the yoke 7 during the mounting operation, the assembling property can be improved and the number of assembling steps can be reduced.

On the other hand, in the motor 1 according to the present invention, the brush holder stage 21 is fixed in the yoke 7 by stay fixing portions 31 a and 31 b using the magnet holder 9. 3 is an exploded perspective view showing the structure of the stay fixing portion 31b, FIG. 4 is an enlarged sectional view of the stay fixing portion 31b, FIG. 5 is a front view thereof, and FIG. 6 is a plan view of the magnet holder 9. Since the two stay fixing portions 31a and 3 lb have the same configuration, FIGS. 3 to 5 show only the configuration of the stay fixing portion 31b on one side (the upper side in FIG. 1).

[0027] As shown in Figs. 3 and 6, the magnet holder 9 used in the stay fixing portions 31a and 31b is provided with a fixing hole 32 in the center. The magnet holder 9 is positioned by a positioning protrusion (not shown) protruding from the yoke inner peripheral surface 7a using the fixing hole 32. A magnet pressing claw (magnet holding portion) 33 is formed on the side surface of the magnet holder 9. Further, a magnet pressing claw (magnet holding portion) 34 is formed on the end face of the magnet holder 9 on the end bracket 11 side. At the center of the magnet retainer claw 33, an intermediate claw 35 is projected in a circumferential direction.

The magnet 8 is attached between the magnet holders 9 fixed to the yoke 7. The magnet 8 is mechanically fixed to the yoke inner peripheral surface 7a by the elastic force of the magnet pressing claw 33. As a result, the magnet 8 is sandwiched between the opposing magnet pressing claws 33 of the adjacent magnet holder 9 and the movement of the magnet 8 in the circumferential direction is restricted. one On the other hand, the movement of the magnet 8 attached between the magnet holders 9 is restricted by the magnet pressing claw 34 and the step 7b (see FIG. 1) formed on the right end surface of the yoke 7.

The magnet holder 9 is further provided with a stay pressing claw (brush holder stage fixing portion) 36 for fixing the brush holder stage 21. The stay presser claw 36 is formed at the center of the end face of the magnet holder 9 on the end bracket 11 side, and protrudes in a direction toward the axial direction. The stay presser claw 36 is formed in the shape of a cantilever leaf spring, and the tip end portion 36a is bent downward (center direction). Further, an elastic force adjusting hole 36b is formed at the center of the stay pressing claw 36, and the elasticity of the stay pressing claw 36 can be appropriately changed by changing the size of the hole 36b.

[0030] Such a motor 1 is assembled as follows. First, the brush holder step 21 is placed on the end bracket 11 and the armature 3 is assembled to the end bracket 11. On the other hand, the magnet holder 9 and the magnet 8 are attached to the yoke 7 in advance. Then, the yoke 7 is attached to the end bracket 11 to which the armature 3 is attached. At this time, the brush holder step 21 is assembled to the yoke 7 in a light press-fit state as described above. Also, as shown in Figs. 3 and 4, when the yoke 7 is attached, the yoke insertion piece 28 (28b in Figs. 3 and 4) is inserted between the stay presser claw 36 and the yoke inner peripheral surface 7a. Pinched. After that, the end bracket 11 and the yoke 7 are fixed by caulking, and the motor 1 in the state shown in FIG. 1 is obtained.

[0031] In the motor 1, when the yoke 7 and the end bracket 11 are assembled, the yoke insertion piece 28 is inserted between the stage pressing claw 36 and the yoke inner peripheral surface 7a. At this time, since the tip end portion 36a of the stay pressing claw 36 is bent downward, the yoke insertion piece 28 is smoothly introduced between the stage pressing claw 36 and the yoke inner peripheral surface 7a. When the brush holder stage 21 is further pushed into the yoke 7, the yoke insertion piece 28 advances to the back against the urging force of the stay pressing claw 36 and enters between the yoke inner peripheral surface 7a. At this time, a directional elastic holding force F is applied to the yoke insertion piece 28 from the stay pressing claw 36 in the outer circumferential direction. With this elastic holding force F, the yoke insertion piece 28 is clamped between the yoke inner peripheral surface 7 a and the stay pressing claw 36, and the brush holder stage 21 is fixed in the yoke 7. As described above, in the motor 1 according to the present invention, the step holder claw 36 is provided on the magnet holder 9 that has been present, and the brush holder stay 21 is disposed between the stay holder claw 36 and the yoke inner peripheral surface 7a. A portion (in this embodiment, the yoke insertion piece 28) is held by inertia, and the brush holder 21 is fixed to the yoke 7. For this reason, parts such as rivets are not necessary, and the brush holder step 21 without increasing the number of parts can be fixed in the yoke 7 without backlash. Therefore, parts costs and assembly man-hours are reduced, and product costs are reduced accordingly.

[0033] Further, since it is not necessary to fix the brush holder step 21 between the yoke 7 and the end bracket 11, no loosening due to thermal contraction or creep deformation occurs, and durability can be improved. In this case, even if creep deformation occurs in the yoke insert piece 28, the elastic region of the stay presser claw 36 can be set larger than the creep amount. Is still pinched between. For this reason, even if creep deformation occurs, the mounting is not loosened, and the occurrence of mounting play can be prevented. Therefore, even in the motor 1 used in the vicinity of the engine, the durability and reliability of the motor without the mounting backlash due to creep deformation or the like is improved. Since the motor 1 is assembled in a stacked manner with the end bracket 11 as a reference as described above, the variation in the dimensions of the brush holder step 21 is also caused by the yoke insertion piece 28 sandwiched between the stay pressing claws 36. Adjusted.

On the other hand, the yoke insertion piece 28 is formed with a flat surface portion 37, and the stay pressing claw 36 abuts on the flat surface portion 37. In this case, if the stay pressing claw abutting surface of the yoke insertion piece 28 is a circumferential surface, the stay pressing claw 36 may make point contact with the yoke insertion piece 28 and a sufficient stage holding effect may not be obtained. In this regard, in the motor 1, since the flat portion 37 is provided on the yoke insertion piece 28 and the stay pressing claw 36 is brought into contact therewith, the stay pressing claw 36 and the yoke insertion piece 28 are in line contact, The effect of maintaining the stage is improved and stabilized.

[0035] Further, the flat portion 37 corresponds to the advance angle of the motor 1 and the center line O of the brush holder stage 21

It is formed at a position inclined by an angle Θ with respect to (center line located in the middle of brush 4). FIG. 7 is an explanatory view showing a contact position of the stay pressing claw 36 with the flat surface portion 37. As shown in FIG. 7, the stay presser claw 36 is provided at a position advanced from the center line O by an angle Θ. It contacts the flat surface portion 37a. Thus, the flat portion 37 can be appropriately set according to the advance angle of the motor.For example, in the case of the advance angle 0, it is sufficient to provide a flat portion perpendicular to the center line O. It can respond flexibly.

Example 2

[0036] Next, a brushed motor that is Embodiment 2 of the present invention will be described. In the following examples, the same members and parts as those in Example 1 are denoted by the same reference numerals, and description thereof is omitted.

[0037] The motor 38 of the second embodiment has substantially the same configuration as the motor 1 of Fig. 1, and only the portions of the stay fixing portions 31a and 31b are different. FIG. 8 is an explanatory view showing the structure of the stay fixing portion 3 lb in the motor 38. As shown in FIG. 8, in the motor 38, the brush holder stay 21 is held by the elastic holding force F of the stay pressing claw (brush holder stay fixing portion) 39 formed in the magnet holder 9.

2

The stay presser claw 39 is also projected in the axial direction in the axial direction at the center of the end surface of the magnet holder 9 on the end bracket 11 side, like the stay presser claw 36 of the motor 1. On the other hand, the stay presser claw 39 in the second embodiment differs from the stay presser claw 36 in that it is bent one step downward (center direction) from the base, and then a flat portion 39b is formed along the axial direction. Yes. A front end portion 39a bent upward (in the outer peripheral direction) is formed on the front end side of the flat surface portion 39b.

On the other hand, a yoke insertion piece 41 (41b in FIG. 8) protrudes from the brush holder stage 21 side. Unlike the motor 1, the yoke insertion piece 41 is formed at a position slightly inward from the outer periphery of the main body 22. When the yoke 7 and the end bracket 11 are assembled, a pressing claw insertion portion 42 is formed between the outside of the yoke insertion piece 41 and the yoke inner peripheral surface 7a. As shown in FIG. 8, a stay presser claw 39 is disposed in the presser claw insertion portion 42 while abutting the outer peripheral surface of the yoke insert piece 41.

[0040] The motor 38 is assembled in the same manner as the motor 1 described above. When the yoke 7 and the end bracket 11 are assembled, the yoke insertion piece 41 is inserted into the yoke 7. When the brush holder step 21 is pushed into the yoke 7, the tip of the yoke insertion piece 41 comes into contact with the tip 39 a of the stay presser claw 39. When the brush holder step 21 is further pushed in, the yoke insertion piece 41 The stepping claw 39 advances to the back against the urging force of the claw 39, and the stepping claw 39 enters the holding claw insertion portion 42 accordingly.

[0041] The stay pressing claw 39 that has entered the pressing claw insertion portion 42 has its flat surface portion 39b abutting against the yoke insertion piece 41 inertially. At this time, the flat portion 43 is formed on the yoke insertion piece 41, and the yoke insertion piece 41 and the stay pressing claw 39 are in surface contact. That is, similarly to the motor 1 of the first embodiment, also in the motor 38, the yoke insertion piece 41 is formed with a flat portion 43 on the surface on which the stay pressing claw 39 abuts. As a result, an elastic holding force F directed toward the center from the step presser claw 39 is applied to the yoke insertion piece 41, and the elastic holding force F

2 The brush holder stage 21 is fixed to the yoke 7.

Thus, in the motor 38 of the second embodiment as well, as with the motor 1 of the first embodiment, the brush holder stage 21 without increasing the number of parts can be fixed in the yoke 7 without backlash. it can. In addition, since the elastic region of the stay presser claw 39 can be set larger than the creep amount of the yoke insertion piece 41, even if creep deformation or the like occurs in the yoke insertion piece 41, the holding force is maintained. And generation of mounting play can be prevented.

Example 3

FIG. 9 is an explanatory diagram showing the configuration of the stay fixing portion 31b in the brushed motor 44 according to the third embodiment of the present invention. The motor 44 of the third embodiment also has substantially the same configuration as the motor 1 of FIG. 1, and only the portions of the stay fixing portions 31a and 31b are different. As shown in FIG. 9, in the motor 44, the brush holder stage 21 is held by the elastic holding force F, F by the stage presser claw (brush holder stage fixing part) 45 formed on the magnet holder 9.

3 4

Is done.

[0044] The stay pressing claw 45 is also provided in the center of the end surface of the magnet holder 9 on the end bracket 11 side so as to protrude in the axial direction. On the other hand, the stay pressing claw 45 in the third embodiment is bent one step downward from the base, and then extends along the axial direction to form a substantially semicircular bent portion 45a. The stay presser claw 45 changes its extending direction at a bent portion 45a, and an extended portion 45b extends further downward. On the other hand, the yoke insertion piece 41 is not formed on the brush holder stage 21 side, and instead, the end face portion thereof has a peripheral wall 46 and an inner peripheral side of the peripheral wall 46 toward the center. A contact surface 47 extending in the direction is provided. [0045] The motor 44 is assembled in the same manner as the motor 1 described above. When the yoke 7 and the end bracket 11 are assembled, the outer peripheral portion of the peripheral wall 46 is fitted into the stay mounting groove 48 formed on the outer periphery of the end portion of the yoke 7. . At this time, the bent portion 45 a of the stay pressing claw 45 abuts on the inner peripheral edge 46 a of the peripheral wall 46. The outer periphery of the bent portion 45a is a cylindrical surface, and this outer peripheral surface comes into contact with the inner peripheral edge 46a of the peripheral wall, that is, the inner corner of the peripheral wall 46. Further, the extended portion 45 b of the stay pressing claw 45 contacts the contact surface 47. Due to the contact of the bent portion 45a, an elastic holding force F having both an outer peripheral direction and an axial direction component is applied to the peripheral wall 46. In addition, due to the contact of the extension 45b,

Three

An elastic holding force F in the axial direction is applied to the contact surface 47. As a result, the brush holder

Four

A force is applied to the tape 21 in the outer circumferential direction and the axial direction, and the brush holder stage 21 is fixed so as to be pressed against the yoke 7 and the end bracket 11.

As described above, in the motor 44 of the third embodiment, as in the motor 1 of the first embodiment, the brush holder stage 21 without increasing the number of parts can be fixed in the yoke 7 without backlash. it can. In addition, the elastic area of the stay presser claw 45 can be set larger than the creep amount of the brush holder step 21, so that the holding force is maintained even if the creep deformation occurs in the brush holder step 21 itself. It is possible to prevent the mounting play.

[0047] It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.

For example, in the above-described embodiment, an example in which the motor according to the present invention is used as a driving source for a fan for cooling a car radiator is shown. However, other in-vehicle motors, motors used for home appliances, IT devices, etc. In addition, the present invention is applicable to a motor used in a high-temperature atmosphere or vibration environment. Further, in the above-described embodiment, an example in which two yoke insertion pieces 28 are provided in the opposite position is shown, but it is sufficient that at least one yoke insertion piece 28 is provided, and the number is not limited to two. . However, since it is better to arrange the yoke insertion pieces 28 at the opposing positions, an even number such as 2, 4, 6 is preferably arranged symmetrically. Furthermore, the form of the stay presser claw 36 is not limited to the above-described example, and various shapes such as those without the hole 36b and those having a plurality of claws (for example, two) can be adopted. .

In addition, in the motor 44 of the third embodiment, the stay presser claw 45 has a peripheral wall 46 and a contact surface 47. It is not always necessary to be in contact with both of them, and it is sufficient that the elastic holding force can be applied to the brush holder step 21 by contacting one of them. However, it is preferable that the elastic force is increased in the direction of contact with both the peripheral wall 46 and the contact surface 47. Similarly to the first embodiment, the stay pressing claws 39 and 45 of the second and third embodiments may be provided with an elastic force adjusting hole (reference numeral 36b of the first embodiment).

Claims

The scope of the claims

[1] A stator including a cylindrical yoke, a plurality of magnets mounted in the yoke, and a magnet holder that is disposed between the magnets and holds the magnets in a predetermined position;

An armature fixed to a rotating shaft and rotatably arranged in the stator; a commutator fixed to the rotating shaft and electrically connected to the armature; a brush slidably contacting the commutator;

A brushed motor attached to the yoke and having a brush holder section having a brush accommodating portion for accommodating and holding the brush;

The motor with a brush, wherein the magnet holder has a brush holder stage fixing portion that abuts the brush holder stage and can hold the brush holder stage in the motor.

[2] In the motor with a brush according to claim 1, the brush holder stay includes an extending portion that extends along an axial direction and is inserted into the yoke, and the brush holder stay fixing portion is A brushed motor characterized by contacting the extended portion and sandwiching the extended portion with the inner peripheral surface of the yoke.

[3] The motor with brush according to claim 2, wherein the brush holder stage has a protrusion that contacts the inner peripheral surface of the yoke on the outer peripheral surface side of the extending portion. .

[4] In the motor with a brush according to claim 1, the brush holder stay includes an extending portion that extends along an axial direction and is inserted into the yoke, and the brush holder stay fixing portion is A brush motor, wherein the motor is in contact with the outer peripheral surface of the extending portion.

[5] The motor with a brush according to claim 2 or 4, wherein the brush holder stay has a flat portion on a side of the extension portion on which the brush holder stay fixing portion abuts. A motor with a brush.

[6] The brushed motor according to [5], wherein the planar portion is disposed at a position corresponding to an advance angle setting of the motor.

7. The motor with a brush according to claim 1, wherein the brush holder stage includes the yoke. A peripheral wall that fits with the inner peripheral portion of the end surface, and an abutting surface that is formed on the inner peripheral side of the peripheral wall and extends in the direction of the center, and the brush holder stay fixing portion includes the peripheral wall and the abutting portion A motor with a brush that is in contact with one or both of the surfaces.

8. The motor with a brush according to claim 1, wherein the brush holder stay fixing portion is in abutment with the brush holder stay.

[9] The motor with brush according to claim 8, wherein the brush holder stage fixing portion is formed in a cantilevered leaf spring shape, and has an adjustment hole for adjusting an elastic force at the center thereof. A motor with a brush.