JP2009278742A - Method and system for manufacturing brushed motors, holding structure for brush holders, and brushed motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance the accuracy of alignment between the central axis of an armature and the center of a brush holder and accurately arrange multiple brushes on the magnetic poles of magnets in the circumferential direction. <P>SOLUTION: The brush holder 22 is placed in a motor housing 14 and a bushing 118 is inserted into a bearing housing portion 50 and a circumferential wall portion 88. The central axis L of the bearing housing portion 50 and the central portions O of the multiple brushes 62 are thereby aligned with each other. With the bushing 118 positioned in the motor housing 14 in the circumferential direction, a positioning protrusion 122 formed on the bushing 118 and a groove 94 formed in the brush holder 22 are engaged with each other in the circumferential direction. The brushes 62 are thereby placed in respective positions predetermined on the motor housing 14 in the circumferential direction. The motor housing 14 and a motor yoke 16 are positioned relative to each other in the circumferential direction and fixed there. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method and system for manufacturing a motor with a brush, a holding structure for a brush holder, and a motor with a brush.

Conventionally, as a holding structure of a brush holder, for example, there is the following (see Patent Document 1). That is, in the technique described in Patent Document 1, a notch is formed in a substrate provided in the brush device, and floating rubber is fitted into the notch. In addition, a hole is formed in the floating rubber, and a cylindrical collar is inserted into the hole. Then, a screw is inserted into this collar, and this screw is screwed into a screw hole of the housing, whereby the brush device is fixed to the housing.
JP 2003-37963 A

  However, in the technique described in Patent Document 1, for example, the brush device may be fixed to the housing in a state where the floating rubber is bent. In this case, the matching accuracy between the center axis of the armature and the center of the brush holder is lowered, or the mounting position of the brush holder with respect to the motor housing is shifted in the circumferential direction.

  Here, when the matching accuracy between the center axis of the armature and the center of the brush holder is reduced, the contact position of the brush with the commutator is shifted, and magnetic noise is generated with the deterioration of the rectification state, When the contact pressure to the commutator of the brush is not sufficiently obtained, the brush is violated and a brush sound is generated.

  On the other hand, a motor yoke is fixed to the motor housing with screws, and a magnet is fixed to the inner peripheral surface of the motor yoke. As described above, the mounting position of the brush holder with respect to the motor housing is in the circumferential direction. In the case of deviation, the plurality of brushes are arranged so as to be displaced in the circumferential direction with respect to the magnetic pole of the magnet. In this case, there is a difference between the current switching timing by the brush and the commutator, that is, the timing at which the magnetic field is generated in each winding and the timing at which each winding passes through the magnetic pole of the magnet. As the attractive repulsive force with the magnetic field decreases, the motor torque decreases, and torque ripples that cause vibration and noise occur.

  Furthermore, in the technique described in Patent Document 1, the floating rubber is provided only in the peripheral portion of the screw, and the contact area between the floating rubber and the substrate of the brush holder is small. For this reason, the brush holder may be fixed to the motor housing with an inclination (relative to the rotation axis of the armature). Also in this case, the contact angle and relative position of the brush with respect to the commutator are displaced, and the contact state of the brush with the commutator is deteriorated.

  The present invention has been made in view of the above problems, and an object of the present invention is to improve the matching accuracy between the center axis of the armature and the center of the brush holder and to surround the plurality of brushes with respect to the magnetic poles of the magnet. It is to arrange in the direction with high accuracy.

  Another object of the present invention is to hold the brush holder in the motor housing in a state orthogonal to the rotation axis of the armature (a state in which inclination is prevented).

  In order to solve the above-mentioned problem, a method of manufacturing a motor with a brush according to claim 1 includes a first step of placing a brush holder on a support portion formed on a motor housing, and a bearing formed on the motor housing. By mounting a jig on the housing portion and the mounted portion formed on the brush holder, the brush holder is positioned in a direction orthogonal to the axial direction of the bearing housing portion with respect to the motor housing. A central axis of a portion and a central portion of a plurality of brushes concentrically provided on the brush holder are aligned with each other, and the brush holder is positioned circumferentially with respect to the motor housing so that the plurality of brushes are moved to the motor housing. A second step of arranging the jigs at predetermined positions in the circumferential direction of the bearing, and a state in which the jig is mounted on the bearing housing portion and the mounted portion. In the third step of fixing the brush holder to the motor housing, the jig is removed from the bearing accommodating portion and the mounted portion, and the motor shaft of the armature is accommodated in the motor housing, and the motor shaft is A fourth step of accommodating the inserted bearing in the bearing accommodating portion; a motor yoke having a magnet fixed to an inner peripheral surface thereof; and the armature being rotatably accommodated in the motor housing, the motor housing and the motor yoke And a fifth step of fixing in a state where they are positioned in the circumferential direction.

  In the method for manufacturing a motor with a brush according to claim 1, in the second step, a jig is attached to a bearing housing portion formed in the motor housing and a mounting portion formed in the brush holder, and the brush holder is moved to the motor. The bearing housing portion is positioned in a direction orthogonal to the axial direction of the bearing housing portion, and the center axis of the bearing housing portion and the center portions of the plurality of brushes (centers of the brush holder) are made to coincide. In other words, the brush holder is centered on the basis of the bearing housing portion formed in the motor housing. Therefore, for example, compared with the case where the center of the brush holder is centered on the part other than the bearing housing portion in the motor housing, the center axis of the armature and the center of the brush holder supported by the bearing housing portion via the bearing That is, it is possible to improve the matching accuracy between the central axis of the commutator and the central part of the plurality of brushes.

  In the method for manufacturing a motor with a brush according to claim 1, the brush holder is positioned in the circumferential direction with respect to the motor housing using a jig in the second step, whereby a plurality of brushes are arranged around the motor housing. Each is arranged at a predetermined position in the direction. In the third step, the brush holder is fixed to the motor housing in a state where the jig is mounted on the bearing housing portion and the mounted portion, that is, in a state where the positioning state in the second step is maintained. Therefore, it is possible to prevent the positional deviation of the plurality of brushes in the circumferential direction with respect to the motor housing, and to accurately arrange the plurality of brushes at predetermined positions in the circumferential direction of the motor housing.

  In the fifth step, the motor housing, in which the brushes are respectively arranged at predetermined positions in the circumferential direction, and the motor yoke, in which the magnet is fixed to the inner peripheral surface, are fixed. Position the motor yoke in the circumferential direction. As a result, a plurality of brushes can be accurately arranged in the circumferential direction with respect to the magnetic pole of the magnet.

  Thus, according to the method for manufacturing a motor with a brush according to claim 1, the matching accuracy between the central axis of the armature and the center of the brush holder (that is, the central axis of the commutator and the central part of the plurality of brushes). In addition, the plurality of brushes can be accurately arranged in the circumferential direction with respect to the magnetic poles of the magnet.

  Note that, as in the method for manufacturing a motor with a brush according to claim 2, in the second step described above, for example, the cover formed on the brush holder so as to be coaxial with the center of the plurality of brushes. The nesting is inserted into the circumferential wall portion and the bearing housing portion so that the outer circumferential surface of the nesting portion as the jig is in contact with the inner circumferential surface of the circumferential wall portion as the mounting portion and the inner circumferential surface of the bearing housing portion. By inserting, the brush holder is positioned in the direction orthogonal to the axial direction of the bearing housing portion with respect to the motor housing, and the central axis of the bearing housing portion and the central portions of the plurality of brushes are aligned, By engaging the engaging part formed on the nest and the engaged part formed on the brush holder in the circumferential direction with the nest positioned in the circumferential direction with respect to the motor housing, The brush holder is suitable when the respectively disposed a plurality of brush is positioned in a circumferential direction relative to the motor housing at a predetermined position in the circumferential direction of the motor housing.

  The method for manufacturing a motor with a brush according to claim 3, wherein, in the first step, the first contact surface formed in the support portion and orthogonal to the axial direction of the bearing housing portion, and the brush holder with the first A contact surface and a second contact surface formed opposite to each other in the axial direction of the bearing housing portion are contacted, and in the third step, the first contact surface and the second contact surface This is a method of fixing the brush holder to the motor housing in a state where the contact state is maintained.

  According to the method for manufacturing a motor with a brush according to claim 3, when the brush holder is placed on the support portion in the first step, the first contact surface formed on the support portion and the brush holder are formed. Since the second abutting surface is brought into contact, the brush holder can be placed on the support portion of the motor housing in a state orthogonal to the rotation axis of the armature (a state in which inclination is prevented). In the third step, the brush holder is fixed to the motor housing while maintaining the contact state between the first contact surface and the second contact surface. Can be held in a state orthogonal to (a state in which inclination is prevented).

  In order to solve the above-mentioned problem, the brushed motor manufacturing system according to claim 4 has a motor housing holding device for holding the motor housing and a brush holder placed on a support portion formed on the motor housing. A brush holder assembling apparatus, a bearing housing portion formed in the motor housing, and a mounted portion formed in the brush holder, whereby the brush holder is housed in the motor housing with respect to the motor housing. Positioning in a direction orthogonal to the axial direction of the part, the central axis of the bearing housing part and the central part of a plurality of brushes concentrically provided on the brush holder are aligned with each other, and the brush holder is attached to the motor housing The plurality of brushes are respectively positioned at predetermined positions in the circumferential direction of the motor housing by positioning in the circumferential direction. A jig to be arranged, a brush holder fixing device for fixing the brush holder to the motor housing, a motor shaft of an armature is accommodated in the motor housing, and a bearing into which the motor shaft is inserted is accommodated in the bearing accommodating portion. An armature assembling device, a motor yoke assembling device for assembling a motor yoke to the motor housing, and a motor yoke fixing device for fixing the motor housing and the motor yoke in a state where they are positioned in the circumferential direction. .

  In the brushed motor manufacturing system according to the fourth aspect, for example, the brushed motor is manufactured in the following manner. That is, in a state where the motor housing is held by the motor housing holding device, the brush holder is mounted on the support portion formed on the motor housing by the brush holder assembling device (first step).

  Subsequently, a jig is mounted on the bearing housing portion formed on the motor housing and the mounted portion formed on the brush holder. And with this jig, the brush holder is positioned in a direction orthogonal to the axial direction of the bearing housing part with respect to the motor housing, and the central axis of the bearing housing part and the central part of the plurality of brushes (center of the brush holder) Is matched. Along with this, the above-mentioned jig is used to position the brush holder in the circumferential direction with respect to the motor housing, and the plurality of brushes are respectively arranged at predetermined positions in the circumferential direction of the motor housing (second step). ).

  Then, the brush holder is fixed in a state where the brush holder is positioned on the motor housing by the brush holder fixing device in a state where the jig is mounted on the bearing housing portion and the mounted portion (third step).

  Subsequently, the jig is removed from the bearing housing portion and the mounted portion, the armature motor shaft is housed in the motor housing by the armature assembly device, and the bearing into which the motor shaft is inserted is housed in the bearing housing portion. (Fourth step).

  Then, the motor yoke is assembled to the motor housing by the motor yoke assembling apparatus, and the motor housing and the motor yoke are fixed in the circumferentially positioned state by the motor yoke fixing apparatus (fifth step). The brushed motor is manufactured by the above procedure.

  Here, in the manufacturing system for a motor with a brush according to claim 4, as described above, the jig is mounted on the bearing housing portion formed on the motor housing and the mounted portion formed on the brush holder. Thus, the brush holder is positioned with respect to the motor housing in the direction orthogonal to the axial direction of the bearing housing portion, and the central axis of the bearing housing portion and the central portions of the plurality of brushes (centers of the brush holder) are aligned. In other words, the brush holder is centered with reference to the bearing housing formed in the motor housing. Therefore, for example, compared to the case where the brush holder is centered on the basis of a portion other than the bearing housing portion in the motor housing, the central axis of the armature supported by the bearing housing portion via the bearing and the brush holder The coincidence accuracy between the center (that is, the central axis of the commutator and the central part of the plurality of brushes) can be improved.

  In the motorized motor manufacturing system according to claim 4, as described above, the brush holder is positioned in the circumferential direction with respect to the motor housing by the jig, whereby the plurality of brushes are arranged in the circumferential direction of the motor housing. Are respectively arranged at predetermined positions. The brush holder is fixed to the motor housing by the brush holder fixing device in a state where the jig is mounted on the bearing housing portion and the mounted portion, that is, in a state where the positioning state of the brush holder with respect to the motor housing is maintained. Fixed to. Therefore, it is possible to prevent the positional deviation of the plurality of brushes in the circumferential direction with respect to the motor housing, and to accurately arrange the plurality of brushes at predetermined positions in the circumferential direction of the motor housing.

  Then, the motor yoke fixing device fixes the motor housing in which the brushes are respectively arranged at predetermined positions in the circumferential direction and the motor yoke having the magnet fixed to the inner peripheral surface. The housing and the motor yoke are positioned in the circumferential direction. As a result, a plurality of brushes can be accurately arranged in the circumferential direction with respect to the magnetic pole of the magnet.

  Thus, according to the manufacturing system of the motor with brush according to claim 4, the matching accuracy between the central axis of the armature and the center of the brush holder (that is, the central axis of the commutator and the central part of the plurality of brushes). In addition, the plurality of brushes can be accurately arranged in the circumferential direction with respect to the magnetic poles of the magnet.

  In addition, like the manufacturing system of the motor with a brush according to claim 5, as the above-mentioned jig, for example, the above-mentioned attachment formed in the brush holder so as to be coaxial with the central part of the plurality of brushes A body portion inserted into the circumferential wall portion and the bearing housing portion so that an outer circumferential surface is in contact with an inner circumferential surface of the circumferential wall portion as a portion and an inner circumferential surface of the bearing housing portion; It is preferable to use a nest that is formed and has an engaged portion formed on the brush holder and an engaging portion that is engaged in the circumferential direction.

  The brush motor manufacturing system according to claim 6 is the brush motor manufacturing system according to claim 4 or 5, wherein the brush holder assembling device is formed in the support portion. A first contact surface orthogonal to the axial direction of the first contact surface, and a second contact surface formed on the brush holder so as to oppose the first contact surface and the axial direction of the bearing housing portion. The brush holder is placed on the support portion, and the brush holder fixing device maintains the contact state between the first contact surface and the second contact surface. It is the structure fixed to a housing.

  In the manufacturing system of the motor with brush according to claim 6, the brush holder assembling apparatus so that the first contact surface formed in the support portion and the second contact surface formed in the brush holder are in contact with each other. Thus, the brush holder is placed on the support portion, and the brush holder is fixed to the motor housing by the brush holder fixing device while maintaining the contact state between the first contact surface and the second contact surface.

  Thus, according to the manufacturing system of the motor with brush according to claim 6, when the brush holder is placed on the support portion by the brush holder assembling device, the first contact surface formed on the support portion. And the second contact surface formed on the brush holder are in contact with each other, so that the brush holder is placed on the support portion of the motor housing in a state perpendicular to the rotation axis of the armature (a state in which inclination is prevented). Can do. The brush holder fixing device fixes the brush holder to the motor housing while maintaining the contact state between the first contact surface and the second contact surface. It can be held in a state orthogonal to the rotation axis (a state in which inclination is prevented).

  In order to solve the above-mentioned problem, a holding structure for a brush holder according to claim 7 is provided on a motor yoke side of a motor housing and provided around a bearing housing portion, and the support portion with respect to the support portion. Provided in a brush holder disposed on the motor yoke side, supported portion supported by the support portion, a fixed portion formed in the motor housing, and formed in the brush holder and fixed to the fixed portion A fixed portion, a circumferential wall portion formed on the brush holder so as to be coaxial with a central portion of a plurality of brushes concentrically provided on the brush holder, and an engagement portion formed on the brush holder A joint part.

  In the brush holder holding structure according to the seventh aspect, for example, the brush holder is held by the motor housing in the following manner. That is, a brush holder is placed on a support portion formed in the motor housing, and a jig is formed on the inner peripheral surface of the circumferential wall portion formed in the brush holder and the inner peripheral surface of the bearing housing portion formed in the motor housing. As described above, the insert is inserted into the circumferential wall portion and the bearing housing portion so that the outer peripheral surface of the insert is in contact. The brush holder is positioned in the direction orthogonal to the axial direction of the bearing housing portion with respect to the motor housing by this insertion, and the central axis of the bearing housing portion and the central portion of the plurality of brushes (center of the brush holder) coincide with each other. Is done.

  At the same time, the engaging portion formed on the nest and the engaged portion formed on the brush holder are engaged in the circumferential direction with the above-described nest positioned in the circumferential direction with respect to the motor housing. Is done. The brush holder is positioned in the circumferential direction with respect to the motor housing by the engagement between the engaging portion and the engaged portion, and the plurality of brushes are respectively arranged at predetermined positions in the circumferential direction of the motor housing. The

  And a brush holder is fixed to a motor housing in the state where the insert was inserted in the circumferential direction wall part and the bearing accommodating part. By the above procedure, the brush holder is held by the motor housing.

  Here, in the holding structure of the brush holder according to claim 7, as described above, the brush holder is formed by inserting a nest into the bearing housing portion formed in the motor housing and the circumferential wall portion formed in the brush holder. Can be positioned in a direction perpendicular to the axial direction of the bearing housing portion with respect to the motor housing, and the central axis of the bearing housing portion and the central portions of the plurality of brushes (centers of the brush holder) can be made to coincide with each other. In other words, the brush holder can be centered with reference to the bearing housing portion formed in the motor housing. Therefore, for example, compared with the case where the center of the brush holder is centered on the part other than the bearing housing portion in the motor housing, the center axis of the armature and the center of the brush holder supported by the bearing housing portion via the bearing That is, it is possible to improve the matching accuracy between the central axis of the commutator and the central part of the plurality of brushes.

  Moreover, in the holding structure of the brush holder according to claim 7, as described above, the brush holder is positioned in the circumferential direction with respect to the motor housing using the insert, and thereby, the plurality of brushes are arranged in the circumferential direction of the motor housing. Can be arranged at predetermined positions. Therefore, if the brush holder is fixed to the motor housing while maintaining the above-described circumferential positioning, the plurality of brushes are prevented from being displaced in the circumferential direction with respect to the motor housing. Each can be accurately arranged at a predetermined position in the circumferential direction.

  And after that, when fixing the motor housing in which the brush is arranged at a predetermined position in the circumferential direction as described above and the motor yoke having the magnet fixed to the inner peripheral surface, the motor housing and the motor yoke are fixed. If they are positioned in the circumferential direction, the plurality of brushes can be accurately arranged in the circumferential direction with respect to the magnetic poles of the magnet.

  Thus, according to the holding structure of the brush holder according to claim 7, the matching accuracy between the central axis of the armature and the center of the brush holder (that is, the central axis of the commutator and the central portion of the plurality of brushes) is improved. In addition, the plurality of brushes can be accurately arranged in the circumferential direction with respect to the magnetic pole of the magnet.

  The holding structure of the brush holder according to claim 8 is the holding structure of the brush holder according to claim 7, wherein the first contact surface formed in the support portion and orthogonal to the axial direction of the bearing housing portion, And a second contact surface formed on the supported portion so as to be opposed to the first contact surface in the axial direction of the bearing housing portion.

  According to the holding structure of the brush holder according to claim 8, the first abutment surface formed on the support portion and the second abutment surface formed on the supported portion are in contact with each other, whereby the brush holder Can be placed on the support portion of the motor housing in a state orthogonal to the rotation axis of the armature (a state in which inclination is prevented). And if a brush holder is fixed to a motor housing in the state which maintained the contact state of this 1st contact surface and the 2nd contact surface, the state in which the brush holder was orthogonal to the rotating shaft of the armature in the motor housing It can be held (in a state where tilting is prevented).

  In order to solve the above problem, the brushed motor according to claim 9 accommodates and supports an armature including a motor shaft, a core, a winding, and a commutator, and the armature. 9. A motor housing and a motor yoke, and a brush holder held by the motor housing by the brush holder holding structure according to claim 7 or 8 while holding the brush pressed by the commutator.

  According to the brushed motor of the ninth aspect, since at least the brush holder holding structure according to the seventh aspect is provided, the central axis of the armature and the center of the brush holder (that is, the central axis of the commutator) It is possible to improve the matching accuracy with the central portions of the plurality of brushes, and to accurately arrange the plurality of brushes in the circumferential direction with respect to the magnetic pole of the magnet. If the holding structure of the brush holder according to claim 8 is provided, the brush holder can be held in the motor housing in a state orthogonal to the rotation axis of the armature (a state in which inclination is prevented).

  Hereinafter, an embodiment of the present invention will be described.

  1 to 5 show a configuration of a motor 12 with a brush to which a brush holder holding structure 10 according to an embodiment of the present invention is applied. The motor 12 with a brush shown in these drawings is suitably used as a wiper motor incorporated in a vehicle wiper device, for example, and has the following configuration.

  That is, as shown in FIG. 1, the brushed motor 12 includes a motor housing 14, a motor yoke 16, an armature 18, a speed reduction mechanism 20, and a brush holder 22 as main components.

  As shown in FIG. 3, the motor housing 14 is formed with a flange portion 26 extending radially outward from the outer peripheral portion 24 along the outer peripheral portion 24. Fastening portions 28 are formed in the flange portion 26 at two positions in the circumferential direction, and screw holes 30 are formed in the fastening portion 28. On the other hand, as shown in FIG. 4, the motor yoke 16 has a flange portion 34 extending along the outer peripheral portion 32 extending radially outward from the outer peripheral portion 32. A fastened portion 36 is formed in the flange portion 34 at a position aligned with the fastening portion 28 described above, and a through hole 38 is formed in the fastened portion 36.

  As shown in FIG. 5, the motor housing 14 and the motor yoke 16 are inserted into the through hole 38 from the motor yoke 16 side with the flange portion 26 and the flange portion 34 being combined, and this screw The screw 40 is screwed into the screw hole 30 so as to be integrally assembled.

  As shown in FIG. 1, the armature 18 includes a motor shaft 42, a core 44, a winding 46, and a commutator 48, and can be rotated inside the motor housing 14 and the motor yoke 16 described above. Is housed in. The motor shaft 42 is rotatably supported by bearings 54 and 56 respectively housed in a bearing housing portion 50 formed in the motor housing 14 and a bearing housing portion 52 formed in the motor yoke 16.

  The core 44 is disposed so as to oppose the magnet 58 fixed to the inner peripheral surface of the motor yoke 16 and the radial direction of the motor shaft 42, and the commutator 48 is provided integrally or separately with the brush holder 22. The brush 62 held by the brush box 60 is pressed.

  A worm wheel 66 constituting the speed reduction mechanism 20 is rotatably accommodated in the motor housing 14 together with a worm gear 64 formed at the tip of the motor shaft 42. The worm wheel 66 includes an output shaft 68. Are provided so as to be integrally rotatable.

  In the brushed motor 12, the current from the brush 62 is switched by the commutator 48 and supplied to each winding 46, and the magnetic field generated in the winding 46 and the magnetic field of the magnet 58 are attracted or repelled, thereby causing the armature 18. Is rotated. When the worm gear 64 is rotated with the rotation of the armature 18, the rotational force of the worm gear 64 is transmitted to the worm wheel 66 and the output shaft 68 is rotated together with the worm wheel 66.

  Next, a characteristic configuration of the brushed motor 12 will be described.

  As shown in FIG. 2, a support portion 70 is formed in an annular shape around the bearing housing portion 50 on the motor yoke 16 side in the motor housing 14. The support portion 70 is formed with a boss portion 72 as a fixing portion extending toward the motor yoke 16 along the axial direction of the motor shaft 42, and a screw hole 74 is formed in the boss portion 72. . Further, on the motor yoke 16 side of the support portion 70, a flat first contact surface 70A orthogonal to the axial direction of the motor shaft 42 (same as the axial direction of the bearing housing portion 50) is formed in an annular shape.

  On the other hand, the brush holder 22 is disposed on the motor yoke 16 side with respect to the support portion 70 described above, and has a disk-shaped holder main body portion 76. A pair of elastic support portions 78 formed of an elastic body such as rubber is provided on both sides in the radial direction of the motor shaft 42 in the holder main body 76.

  The elastic support portion 78 includes a first elastic support portion 80 as a supported portion provided on the surface of the holder main body portion 76 on the support portion 70 side, and a supported portion provided on the surface of the holder main body portion 76 on the motor yoke 16 side. The structure which has the 2nd elastic support part 82 as a fixing | fixed part, and the connection part 84 which connects the 1st elastic support part 80 and the 2nd elastic support part 82 via the hole 83 formed in the holder main-body part 76. It is said that. The elastic support portion 78 is integrally fixed to the brush holder 22 by being formed by, for example, vulcanization molding or the like.

  Further, on the support portion 70 side of the first elastic support portion 80, a flat second contact surface 80A orthogonal to the axial direction of the motor shaft 42 is in the axial direction of the first contact surface 70A and the motor shaft 42 described above. The connecting portion 84 is formed with a hole portion 86 having a size and shape into which the boss portion 72 is loosely inserted.

  The brush holder 22 has the screw 87 from the motor yoke 16 side in the state where the boss portion 72 is inserted into the hole portion 86 and the first contact surface 70A and the second contact surface 80A are in contact. By being screwed into the screw hole 74 of the boss portion 72 through 86, the motor housing 14 is assembled integrally.

  Further, as shown in FIG. 3, the brush holder 22 is formed with a circumferential wall portion 88 as a mounted portion along the circumferential direction of the holder main body portion 76. The circumferential wall portion 88 is formed coaxially with the central portion O of the plurality of brushes 62 concentrically provided on the brush holder 22 and, as shown in FIG. 2, from the holder main body portion 76 to the motor shaft. It protrudes on both sides in the axial direction of 42.

  As shown in FIG. 2, the inner peripheral surface of the circumferential wall portion 88 is formed between the inner peripheral surface of the hole 90 formed in the holder main body portion 76 and the motor so as to rotatably accommodate the commutator 48. It is formed continuously in the axial direction of the shaft 42. As shown in FIG. 3, the circumferential wall 88 is formed with a notch 92 for projecting the brush 62 radially inward at a position corresponding to the brush 62.

  Further, in the brush holder 22, as shown in FIG. 3, a groove portion 94 as an engaged portion is formed on the inner peripheral surface of the hole 90 formed in the holder main body portion 76 and the inner peripheral surface of the circumferential wall portion 88. Is formed. The groove portion 94 is formed in a V shape in a plan view and is formed along the plate thickness direction of the holder main body portion 76 (same as the axial direction of the motor shaft 42).

  Next, the manufacturing system 100 for manufacturing the brushed motor 12 having the above-described configuration will be described.

  FIG. 6 shows a manufacturing system 100 for manufacturing the brushed motor 12 according to an embodiment of the present invention. As shown in this figure, the manufacturing system 100 includes an automatic conveyance device 102, a motor housing holding device 104, a brush holder assembling device 106, a positioning device 108, a brush holder fixing device 110, an armature assembling device 112, and a motor yoke. An assembly device 114 and a motor yoke fixing device 116 are included.

  The automatic conveyance device 102 is for conveying the motor housing 14 to each process together with a motor housing holding device 104 described later, and is constituted by, for example, a conveyor device. The motor housing holding device 104 is for holding the motor housing 14, and is constituted by a pallet or the like, for example. The brush holder assembling device 106 is for placing the finished brush holder 22 on which the brush 62 and the like are mounted on the support portion 70 formed on the motor housing 14. It is configured.

  The positioning device 108 is for positioning the brush holder 22 placed on the support portion 70 with respect to the motor housing 14. The positioning device 108 includes a nest 118 as a jig and the nest 118 as a bearing housing portion of the motor housing 14. 50 and an actuator for taking in and out of the circumferential wall portion 88 of the brush holder 22. The nesting will be described later in detail.

  The brush holder fixing device 110 is for fixing the brush holder 22 to the motor housing 14, and is configured by an automatic screw fastening device or the like for screwing a screw 87 into the screw hole 74 of the boss portion 72. The armature assembling device 112 is for housing the motor shaft 42 of the armature 18 of the finished product in the motor housing 14 and housing the bearing 54 into which the motor shaft 42 is inserted in the bearing housing portion 50, for example. It consists of an automatic parts assembly robot.

  The motor yoke assembling device 114 is for assembling the motor yoke 16 to the motor housing 14, and is constituted by, for example, an automatic component assembling robot. The motor yoke fixing device 116 is for fixing the motor housing 14 and the motor yoke 16 in a state in which they are positioned in the circumferential direction. A screw 40 is inserted into the through hole 38, and the screw 40 is inserted into the screw hole 30. It is composed of an automatic screw fastening device or the like to be screwed.

  Although not particularly illustrated, the manufacturing system 100 includes a speed reduction mechanism assembling device for assembling the worm wheel 66 and the output shaft 68 to the motor housing 14 and other necessary devices.

  Here, FIG. 7 shows the nesting 118 provided in the positioning device 108 described above in detail. The nest 118 has a main body 120 and a positioning projection 122 as an engaging portion.

  The main body 120 is formed in a cylindrical shape, and when inserted into the circumferential wall 88 and the bearing housing 50, as will be described in detail later, the inner circumferential surface of the circumferential wall 88 and the bearing housing. The size and shape are set so that the outer peripheral surface is in contact with 50 inner peripheral surfaces. On the other hand, the positioning protrusion 122 is engaged with the above-described groove 94 in the circumferential direction, protrudes radially outward from the outer peripheral surface of the main body 120, and extends along the axial direction of the main body 120. Is formed.

  Next, a method for manufacturing the brushed motor 12 using the manufacturing system 100 configured as described above will be described.

  In the manufacturing system 100 according to the embodiment of the present invention, for example, the brushed motor 12 is manufactured by the following procedure. 8A to 12 show a process of manufacturing the brushed motor 12. Note that FIG. 6 is referred to for each device of the manufacturing system 100 in the following description.

(First step)
That is, as shown in FIGS. 8A and 8B, the boss portion 72 is inserted into the hole portion 86 while the motor housing 14 is held by the motor housing holding device 104, and the first contact surface 70A and the first contact surface 70A are The brush holder 22 is placed on the support portion 70 by the brush holder assembling device 106 so that the two contact surfaces 80A are in contact with each other.

  At this time, the boss 72 is loosely inserted into the hole 86 (inserted with a gap). Accordingly, the brush holder 22 has a direction perpendicular to the axial direction of the bearing housing portion 50 with respect to the motor housing 14 (that is, in FIG. It is movable in the arrow X direction and the arrow Y direction, and is rotatable in the circumferential direction of the bearing housing portion 50 (that is, the arrow R direction in FIG. 8B).

(Second step)
Next, as shown in FIGS. 9A and 9B, the circumferential wall 88 and the circumferential wall 88 so that the outer circumferential surface of the main body 120 is in contact with the inner circumferential surface of the circumferential wall 88 and the inner circumferential surface of the bearing housing 50. The insert 118 is inserted into the bearing housing portion 50. The brush holder 22 is positioned with respect to the motor housing 14 in the direction orthogonal to the axial direction of the bearing housing portion 50 (that is, in the direction of the arrow X and the arrow Y in FIG. 9B) by the insert 118, and the bearing housing portion 50. And the central portion O of the plurality of brushes 62 (the center of the brush holder 22) coincide with each other.

  At the same time, the positioning projection 122 formed on the nest 118 and the groove 94 formed on the brush holder 22 in a state where the nest 118 is positioned in the circumferential direction with respect to the motor housing 14 (motor housing holding device 104). Are engaged in the circumferential direction. Then, the engagement between the positioning projection 122 and the groove 94 positions the brush holder 22 in the circumferential direction (that is, in the direction indicated by the arrow R in FIG. 9B) with respect to the motor housing 14. They are respectively arranged at predetermined positions in the circumferential direction.

(Third process)
10A and 10B, the screw 87 is inserted into the screw hole 74 of the boss portion 72 by the brush holder fixing device 110 in a state where the insert 118 is inserted into the circumferential wall portion 88 and the bearing housing portion 50. By being screwed in, the brush holder 22 is fixed in a state of being positioned on the motor housing 14. At this time, the brush holder 22 is fixed to the motor housing 14 in a state where the contact state between the first contact surface 70A and the second contact surface 80A is maintained.

(Fourth process)
Subsequently, the above-described insert 118 is removed from the bearing accommodating portion 50 and the circumferential wall portion 88, and the motor shaft 42 of the armature 18 is accommodated in the motor housing 14 by the armature assembling device 112 as shown in FIG. The bearing 54 into which the motor shaft 42 is inserted is accommodated in the bearing accommodating portion 50.

(Fifth process)
Then, as shown in FIG. 12, the motor yoke 16 is assembled to the motor housing 14 by the motor yoke assembling device 114. At this time, the flange portion 26 and the flange portion 34 are combined, and the fastening portion 28 and the fastened portion 36 (see FIGS. 3 to 5) are aligned. In this state, as shown in FIG. 5, the screw 40 is inserted into the through hole 38 from the motor yoke 16 side by the motor yoke fixing device 116, and the screw 40 is screwed into the screw hole 30. Thereby, the motor housing 14 and the motor yoke 16 are fixed in a state where they are positioned in the circumferential direction.

  Then, the worm wheel 66 and the output shaft 68 are assembled to the motor housing 14 by the reduction mechanism assembling apparatus, and other necessary parts are assembled to complete the brushed motor 12.

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

  In the method for manufacturing the brushed motor 12 according to the embodiment of the present invention, in the second step, the bearing 118 is formed in the bearing housing portion 50 formed in the motor housing 14 and the circumferential wall portion 88 formed in the brush holder 22. And the brush holder 22 is positioned in a direction orthogonal to the axial direction of the bearing housing portion 50 with respect to the motor housing 14, and the central axis L of the bearing housing portion 50 and the central portion O of the plurality of brushes 62 (of the brush holder 22). Center). In other words, the brush holder 22 is centered on the basis of the bearing housing portion 50 formed in the motor housing 14. Therefore, for example, compared with the case where the brush holder 22 is centered on the basis of a portion other than the bearing housing portion 50 in the motor housing 14, the center of the armature 18 supported by the bearing housing portion 50 via the bearing 54 is used. The coincidence accuracy between the shaft and the center of the brush holder 22 (that is, the center axis L of the commutator 48 and the center portion O of the plurality of brushes 62) can be improved.

  Moreover, in the manufacturing method of the motor 12 with a brush which concerns on one Embodiment of this invention, the positioning protrusion 122 formed in the nest | insert 118 and the groove part 94 formed in the brush holder 22 are engaged in the circumferential direction in a 2nd process. Thus, the brush holder 22 is positioned in the circumferential direction with respect to the motor housing 14, and thereby the plurality of brushes 62 are respectively arranged at predetermined positions in the circumferential direction of the motor housing 14. Then, in the third step, the brush holder 22 is fixed to the motor housing 14 with the insert 118 inserted in the bearing housing portion 50 and the circumferential wall portion 88, that is, in a state where the positioning state in the second step is maintained. . Accordingly, it is possible to prevent the displacement of the plurality of brushes 62 in the circumferential direction with respect to the motor housing 14 and to accurately arrange the plurality of brushes 62 at predetermined positions in the circumferential direction of the motor housing 14. Furthermore, in the above embodiment, since the axial height of the elastic support portion 78 is set higher than the axial height of the boss portion 72, the brush holder 22 is elastically supported by screwing in the screw 87. Since the portion 78 is fixed in a compressed state, even if the boss portion 72 is loosely inserted into the hole 86, the displacement is prevented by the frictional force.

  In the fifth step, the motor housing 14 in which the brushes 62 are respectively arranged at predetermined positions in the circumferential direction and the motor yoke 16 having the magnet 58 fixed on the inner peripheral surface are fixed. By fixing the fastening portion 28 and the fastened portion 36 provided at a predetermined circumferential position, the motor housing 14 and the motor yoke 16 are positioned in the circumferential direction. As a result, the plurality of brushes 62 can be accurately arranged in the circumferential direction with respect to the magnetic poles of the magnets 58. When fixing the motor yoke 16 to the motor housing 14, the magnet 58 fixed to the inner peripheral surface of the motor yoke 16 is preferably in a non-magnetized state from the viewpoint of assembly workability. In that case, after fixing the motor housing 14 and the motor yoke 16, the magnet 58 is magnetized from the outer peripheral surface of the motor yoke 16 by the magnetizing device.

  Furthermore, in the method for manufacturing the brushed motor 12 according to the embodiment of the present invention, the first contact surface 70 </ b> A formed on the support portion 70 when the brush holder 22 is placed on the support portion 70 in the first step. And the second contact surface 80 </ b> A formed on the elastic support portion 78, the brush holder 22 is placed on the support portion 70 of the motor housing 14 in the axial direction of the bearing housing portion 50 (the axis of the rotation axis of the armature 18). Can be placed in a state orthogonal to (direction) (a state in which inclination is prevented). In the third step, the brush holder 22 is fixed to the motor housing 14 while maintaining the contact state between the first contact surface 70A and the second contact surface 80A. Can be held in a state perpendicular to the axial direction of the bearing housing portion 50 (axial direction of the rotation axis of the armature 18) (a state in which inclination is prevented).

  Thus, according to the method for manufacturing the motor 12 with brush according to the embodiment of the present invention, the central axis of the armature 18 and the center of the brush holder 22 (that is, the central axis L of the commutator 48 and the plurality of brushes 62). The center portion O) can be improved in accuracy, and the plurality of brushes 62 can be accurately arranged in the circumferential direction with respect to the magnetic poles of the magnet 58, and the brush holder 22 is mounted on the motor housing 14. The armature can be held in a state orthogonal to the rotation axis of the armature (a state in which inclination is prevented). Thereby, it can suppress that a magnetic sound and the brush 62 sound generate | occur | produce, a motor torque fall and a torque ripple generate | occur | produce.

  Moreover, according to the method of manufacturing the motor 12 with the brush according to the embodiment of the present invention, the above effect can be obtained by a simple method of adding the circumferential wall portion 88 and the groove portion 94 to the brush holder 22 and using the insert 118. Can be played. Therefore, since an increase in manufacturing cost can be suppressed, a high-quality brushed motor 12 can be provided at a low cost.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited above, Of course, it can change and implement variously within the range which does not deviate from the main point. .

  For example, in the above-described embodiment, the bearing housing portion 50 side of the circumferential wall portion 88 is substantially the same height as the first elastic support portion 80 as shown in FIG. 2, but as shown in FIG. In addition, the first elastic support portion 80 may protrude toward the bearing housing portion 50. With this configuration, the axial length of the entire circumferential wall portion 88 (that is, the portion that comes into contact with the main body portion 120 of the nest 118) while suppressing the protruding length of the circumferential wall portion 88 on the motor housing 14 side. The length of the armature 18 and the center of the brush holder 22 can be further improved in matching accuracy.

  Moreover, in the said embodiment, although the circumferential direction wall part 88 was formed so that the internal diameter dimension of the bearing accommodating part 50 and each other might become substantially the same as FIG. 2 shows, as FIG. 14 shows. In addition, the inner diameter may be larger than that of the bearing housing portion 50. Accordingly, the main body 120 of the insert 118 is also configured such that the outer diameter of the portion inserted into the circumferential wall portion 88 and the portion inserted into the bearing housing portion 50 are different, as shown in FIG. May be.

  Moreover, in the said embodiment, although only one groove part 94 was formed in the brush holder 22, as FIG. 15 shows, it forms in the multiple places (in this case, two places) in the circumferential direction of the brush holder 22. As shown in FIG. May be. Along with this, a plurality of positioning projections 122 of the insert 118 may be provided in accordance with the number of the groove portions 94.

  Moreover, in the said embodiment, the manufacturing method 100 and the manufacturing system 100 of the motor 12 with a brush are with a brush using the so-called floating support structure in which the brush holder 22 is supported by the motor housing 14 via the elastic support part 78. Although applied to the motor 12, the brush holder 22 may be applied to a motor with a brush having a structure in which the brush housing 22 is directly supported by the motor housing 14 without the elastic support portion 78 interposed therebetween.

  Moreover, in the said embodiment, although the manufacturing method of the motor 12 with a brush was performed automatically by using the manufacturing system 10, you may make it perform each process by the manufacturing system 10 by manual work.

  Moreover, in the said embodiment, although the brush holder 22 was positioned with respect to the motor housing 14 by inserting the nest | insert 118 in the bearing accommodating part 50 and the circumferential wall part 88, the circumferential wall A mounting portion having a form different from that of the portion 88 is formed, and a jig having a form different from the insert 118 is attached to the mounting portion and the bearing housing portion 50, whereby the brush holder 22 is attached to the motor housing 14. It may be positioned with respect to.

It is side surface sectional drawing of the motor with a brush which concerns on one Embodiment of this invention. It is a principal part enlarged view of FIG. It is a top view of the motor housing and brush holder which are shown by FIG. FIG. 2 is a bottom view of the motor yoke shown in FIG. 1. FIG. 2 is a side view of a motor housing and a motor yoke shown in FIG. 1. It is a lineblock diagram of a manufacturing system of a motor with a brush concerning one embodiment of the present invention. It is a perspective view of the nest | insert (jig) used for the manufacturing system of the motor with a brush which concerns on one Embodiment of this invention. It is a figure explaining the manufacturing process (1st process) of the motor with a brush shown by FIG. It is a figure explaining the manufacturing process (1st process) of the motor with a brush shown by FIG. It is a figure explaining the manufacturing process (2nd process) of the motor with a brush shown by FIG. It is a figure explaining the manufacturing process (2nd process) of the motor with a brush shown by FIG. It is a figure explaining the manufacturing process (3rd process) of the motor with a brush shown by FIG. It is a figure explaining the manufacturing process (3rd process) of the motor with a brush shown by FIG. It is a figure explaining the manufacturing process (4th process) of the motor with a brush shown by FIG. It is a figure explaining the manufacturing process (5th process) of the motor with a brush shown by FIG. It is a figure which shows the modification of one Embodiment of this invention. It is a figure which shows the modification of one Embodiment of this invention. It is a figure which shows the modification of one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Brush holder holding structure, 12 ... Motor with brush, 14 ... Motor housing, 16 ... Motor yoke, 18 ... Armature, 20 ... Reduction mechanism, 22 ... Brush holder, 28 ... Fastening part, 36 ... Fastened part, 42 ... motor shaft, 44 ... core, 46 ... winding, 48 ... commutator, 50, 52 ... bearing housing, 54, 56 ... bearing, 58 ... magnet, 60 ... brush box, 62 ... brush, 64 ... worm gear, 66 ... Worm wheel, 68 ... Output shaft, 70 ... Support portion, 70A ... First contact surface, 72 ... Boss portion (fixed portion), 76 ... Holder body portion, 78 ... Elastic support portion, 80 ... First elastic support Part (supported part), 80A ... second contact surface, 82 ... second elastic support part (fixed part), 84 ... connecting part, 88 ... circumferential wall part (attached part), 92 ... notch 94 ... groove, 100 ... made System, 118 ... nested (jig), 120 ... main body, 122 ... projection

Claims (9)

A first step of placing the brush holder on the support formed in the motor housing;
By attaching a jig to the bearing housing portion formed in the motor housing and the mounted portion formed in the brush holder, the brush holder is orthogonal to the motor housing in the axial direction of the bearing housing portion. The center axis of the bearing housing portion and the center portion of the plurality of brushes concentrically provided on the brush holder are aligned with each other, and the brush holder is positioned circumferentially with respect to the motor housing. A second step of arranging the plurality of brushes at predetermined positions in the circumferential direction of the motor housing;
A third step of fixing the brush holder to the motor housing in a state where the jig is mounted on the bearing housing portion and the mounted portion;
A fourth step of removing the jig from the bearing housing portion and the mounted portion, housing the motor shaft of the armature in the motor housing, and housing the bearing into which the motor shaft is inserted in the bearing housing portion; ,
A motor yoke having a magnet fixed to an inner peripheral surface and a fifth step of rotatably accommodating the armature in the motor housing and fixing the motor housing and the motor yoke in a circumferentially positioned state;
Of manufacturing a motor with a brush. In the second step,
As the jig, the inner peripheral surface of the circumferential wall portion as the mounted portion and the inner peripheral surface of the bearing housing portion formed in the brush holder so as to be coaxial with the central portion of the plurality of brushes. The brush holder is positioned with respect to the motor housing in the direction orthogonal to the axial direction of the bearing housing portion by inserting the insert into the circumferential wall portion and the bearing housing portion so that the outer peripheral surface of the insert is in contact with each other. And the center axis of the bearing housing and the center of the plurality of brushes are matched,
By engaging the engaging portion formed on the nest and the engaged portion formed on the brush holder in the circumferential direction with the nest positioned in the circumferential direction with respect to the motor housing, the brush The holder is positioned in the circumferential direction with respect to the motor housing, and the plurality of brushes are respectively arranged at predetermined positions in the circumferential direction of the motor housing.
The manufacturing method of the motor with a brush of Claim 1. In the first step,
A first contact surface formed on the support portion and orthogonal to the axial direction of the bearing housing portion, and a second contact surface formed on the brush holder so as to face the first contact surface and the bearing housing portion in the axial direction. Abut the contact surface,
In the third step,
Fixing the brush holder to the motor housing while maintaining a contact state between the first contact surface and the second contact surface;
The manufacturing method of the motor with a brush of Claim 1 or Claim 2. A motor housing holding device for holding the motor housing;
A brush holder assembling device for placing a brush holder on a support portion formed in the motor housing;
The brush holder is mounted in a direction perpendicular to the axial direction of the bearing housing portion with respect to the motor housing by being mounted on a bearing housing portion formed on the motor housing and a mounted portion formed on the brush holder. The plurality of brushes are positioned so that the central axis of the bearing housing portion and the central portions of a plurality of brushes concentrically provided on the brush holder are aligned with each other, and the brush holder is positioned circumferentially with respect to the motor housing. Jigs that respectively arrange the brushes at predetermined positions in the circumferential direction of the motor housing,
A brush holder fixing device for fixing the brush holder to the motor housing;
An armature assembling device for accommodating the motor shaft of the armature in the motor housing and accommodating the bearing into which the motor shaft is inserted in the bearing accommodating portion;
A motor yoke assembling device for assembling a motor yoke to the motor housing;
A motor yoke fixing device for fixing the motor housing and the motor yoke in a state of being positioned in the circumferential direction;
Manufacturing system for motors with brushes. The jig is
The outer peripheral surface is in contact with the inner peripheral surface of the circumferential wall portion as the mounted portion and the inner peripheral surface of the bearing housing portion formed in the brush holder so as to be coaxial with the central portions of the plurality of brushes. A body portion inserted into the circumferential wall portion and the bearing accommodating portion,
An engagement portion formed in the main body portion and engaged in a circumferential direction with an engaged portion formed in the brush holder;
Nested with,
The manufacturing system of the motor with a brush of Claim 4. The brush holder assembling apparatus is
A first contact surface formed on the support portion and orthogonal to the axial direction of the bearing housing portion, and a second contact surface formed on the brush holder so as to face the first contact surface and the bearing housing portion in the axial direction. The brush holder is placed on the support portion so that the contact surface comes into contact with the contact surface,
The brush holder fixing device is
Fixing the brush holder to the motor housing while maintaining a contact state between the first contact surface and the second contact surface;
The manufacturing system of the motor with a brush of Claim 4 or Claim 5. A support portion provided on the motor yoke side of the motor housing and around the bearing housing portion;
A supported part provided on a brush holder disposed on the motor yoke side with respect to the support part, and supported by the support part;
A fixing portion formed on the motor housing;
A fixed part formed on the brush holder and fixed to the fixing part;
A circumferential wall portion formed on the brush holder so as to be coaxial with a center portion of a plurality of brushes provided concentrically on the brush holder;
An engaged portion formed on the brush holder;
A structure for holding a brush holder. A first contact surface formed on the support portion and orthogonal to the axial direction of the bearing housing portion;
A second contact surface formed on the supported portion so as to be opposed to the first contact surface in the axial direction of the bearing housing portion, and contacted with the first contact surface;
The holding structure for a brush holder according to claim 7, comprising: An armature composed of a motor shaft, a core, a winding, and a commutator;
A motor housing and a motor yoke for receiving and supporting the armature;
While holding the brush pressed by the commutator, the brush holder held in the motor housing by the holding structure of the brush holder according to claim 7 or 8,
Motor with brush.

Images