JP6285295B2 - Motor with reduction gear and assembly method of motor with reduction gear - Google Patents

Description

  The present invention relates to a motor with a reduction gear and a method for assembling the motor with a reduction gear.

  A power window motor (motor with a speed reducer) described in Patent Document 1 below includes an electric motor (motor body) and a speed reducer. This electric motor includes a yoke having a bottomed cylindrical shape, an armature rotatably accommodated in the yoke, and a brush holder that closes the opening of the yoke. In the assembled state (unit state) of the electric motor, the brush holder is fixed to the yoke by press-fitting the press-fitted portion of the brush holder into the opening of the yoke.

  By the way, in the manufacture of such a motor with a reduction gear, after the electric motor (motor body) and the reduction gear are assembled in a unit state, the electric motor and the reduction gear in the unit state are separated into separate assembly lines (locations). It may be assembled with. In this case, it is necessary to transport the electric motor in a unit state to another assembly line.

Japanese Patent Application Laid-Open No. 2010-154685

  However, when the electric motor in a unit state is transported to another assembly line, for example, external force is input to the electric motor due to vibration during transportation, and the brush holder is moved against the yoke in the axial direction of the electric motor. There is a risk of deviation. In this case, there is a problem that the productivity of the motor with a reduction gear decreases.

  In view of the above facts, an object of the present invention is to provide a motor with a reduction gear and a method of assembling the motor with a reduction gear, which can improve productivity.

  In the motor with a speed reducer of the present invention, a yoke having a bottomed cylindrical shape, and a rotating shaft that is housed inside the yoke and whose end on one side in the axial direction is rotatably supported by the bottom of the yoke. A brush holder provided at an opening end portion of the yoke, rotatably supporting the other axial side of the rotating shaft, and having a press-fitting portion press-fitted into the opening end portion of the yoke; Is provided on the other axial side of the rotary shaft, fixed to the yoke to restrict movement of the rotary shaft to the other axial side of the brush holder, and coupled to the rotary shaft to rotate the rotary shaft A speed reducer having a speed reducing portion that decelerates rotation of the shaft, and an engaging portion that is provided on the brush holder and is engaged with the yoke to restrict movement of the rotating shaft to the other side in the axial direction of the brush holder. It is equipped with a.

  According to the motor with a reduction gear configured as described above, the armature is housed inside the yoke formed in a bottomed cylindrical shape. The armature has a rotation shaft, and an end portion on one side in the axial direction of the rotation shaft is rotatably supported on the bottom portion of the yoke. Further, the press-fit portion of the brush holder is press-fitted into the open end portion of the yoke, and the other axial side of the rotation shaft is rotatably supported by the brush holder. Thereby, the brush holder is fixed to the yoke (hereinafter referred to as primary fixing), and the motor body of the motor with a reduction gear is assembled.

  Further, a speed reducer is provided on the other side in the axial direction of the rotating shaft with respect to the yoke, and the speed reducer is fixed to the yoke (hereinafter referred to as secondary fixing). In this secondary fixed state, the reduction of the brush holder to the other side in the axial direction of the rotation shaft is restricted by the reduction gear, and the reduction portion of the reduction gear is coupled to the rotation shaft. Thereby, rotation of a rotating shaft is decelerated by the deceleration part.

  Here, the brush holder is provided with an engaging portion, and the engaging portion is engaged with the yoke, so that the movement of the rotation axis of the brush holder to the other side in the axial direction is restricted. For this reason, in the state where the brush holder is primarily fixed to the yoke, in addition to the brush holder being fixed to the yoke by press-fitting, the movement of the brush holder to the other side in the axial direction of the rotating shaft is restricted by the engagement. Has been. For this reason, even when an external force is input to the motor body in a state where the brush holder is primarily fixed to the yoke, it is possible to suppress the positional deviation between the brush holder and the yoke in the axial direction of the rotation shaft. Thereby, for example, the assembly line for primarily fixing the brush holder to the yoke is different from the assembly line for fixing the reduction gear to the motor body (yoke), so that the motor body is moved to another assembly line (location). Even when transported, the primary fixed state of the brush holder can be stably maintained. Therefore, the productivity of the motor with a reduction gear can be improved.

  In the motor with a reduction gear according to the present invention, in addition to the above-described configuration, the yoke is formed with a flange extending radially outward of the rotating shaft from the opening end, and the outer periphery of the flange. A part of the end surface is a linear end surface that extends linearly when viewed from the axial direction of the rotating shaft, and the engaging portion has an abutting portion configured to be able to abut on the linear end surface. Yes.

  According to the motor with a speed reducer having the above configuration, the flange is formed on the yoke, and the flange extends from the opening end of the yoke to the outside in the radial direction of the rotating shaft. In addition, a part of the outer peripheral end surface of the flange is a linear end surface extending linearly when viewed from the axial direction of the rotating shaft, and the engaging portion is configured to be able to contact the linear end surface have. For this reason, when the brush holder tries to rotate in the circumferential direction of the rotation shaft with respect to the yoke, the contact portion of the engagement portion is brought into contact with the linear end surface. Thereby, relative rotation with respect to the yoke of a brush holder can be suppressed. As a result, it is possible to suppress relative rotation of the brush holder with respect to the yoke in the circumferential direction of the rotation shaft while suppressing relative movement of the brush holder with respect to the yoke in the axial direction of the rotation shaft.

  In the motor with a reduction gear according to the present invention, in addition to the above-described configuration, the engaging portion includes a main body configured to be elastically deformable in a direction perpendicular to the surface of the linear end surface, and the linear end surface of the flange. And a claw portion engaged with the outer peripheral edge portion of the portion. The engagement portion is engaged with the yoke by a snap fit.

  According to the motor with a reduction gear configured as described above, the engaging portion includes the main body portion and the claw portion, and the engaging portion is engaged with the yoke by snap fitting. Accordingly, when the press-fitting portion of the brush holder is press-fitted into the yoke, the engaging portion can be engaged with the yoke by snap fitting as the brush holder moves in the press-fitting direction. Thereby, even when the engaging part engaged with a yoke is provided in a brush holder, it can suppress that an assembly man-hour increases.

  In the motor with a reduction gear according to the present invention, in addition to the above-described configuration, the brush holder is provided with a pair of rotation restricting portions arranged to face the linear end surface.

  According to the motor with a reduction gear configured as described above, since the pair of rotation restricting portions provided on the brush holder are disposed to face the linear end surface, the brush holder is disposed in the circumferential direction of the rotation shaft with respect to the yoke. When the rotation is attempted, the rotation restricting portion comes into contact with the linear end surface. Thereby, relative rotation with respect to the yoke of the brush holder in the circumferential direction of a rotating shaft can be suppressed further. Therefore, the primary fixed state of the brush holder can be maintained more stably.

  Further, in the motor with a reduction gear according to the present invention, in addition to the above configuration, the brush holder is formed with a connector portion disposed radially outside the rotation shaft with respect to the yoke, and the engagement A portion is formed in the connector portion.

  According to the motor with a reduction gear configured as described above, the connector portion is formed on the brush holder. The connector portion is disposed radially outside the rotation shaft with respect to the yoke, and the engaging portion is formed in the connector portion. For this reason, the primary fixed state of the brush holder can be stably maintained while the connector portion disposed radially outside the rotating shaft with respect to the yoke is held on the yoke by the engaging portion.

  In the motor with a reduction gear according to the present invention, in addition to the above configuration, the yoke is formed in a bottomed cylindrical shape.

  According to the motor with a speed reducer having the above configuration, the shape of the yoke can be simplified as compared with the case where the cross-sectional shape of the yoke is configured to be a track shape (substantially elliptical), for example.

  Also, the method for assembling the motor with a reduction gear according to the present invention is applied to the motor with the reduction gear described above, and press-fits the press-fitting portion into the opening end portion of the yoke and engages the engagement portion with the yoke. A primary fixing step of primarily fixing the brush holder to the yoke, and a secondary fixing step of fixing the speed reducer to the yoke after the brush holder is primarily fixed to the yoke. Have.

  According to the assembling method of the motor with a speed reducer having the above configuration, the brush holder is primarily fixed to the yoke, and then the speed reducer is secondarily fixed to the yoke. Thereby, as described above, for example, the assembly line for primary fixing the brush holder to the yoke is different from the assembly line for fixing the reduction gear to the yoke, so that the motor body is separated from another assembly line (location). Even in the case of transporting to, the primary fixed state of the brush holder is stably maintained, so that the productivity of the motor with a speed reducer can be improved.

It is the perspective view seen from the axial direction one side of the motor main part which shows the principal part of the motor with a reduction gear concerning this Embodiment. It is the front view which looked at the principal part of the motor with a reduction gear shown by FIG. 1 from the axial direction one side of the motor main body. It is a perspective view which shows the whole motor main body of the motor with a reduction gear which concerns on this Embodiment. It is a side view which shows the whole motor main body shown by FIG. It is a side view which shows the whole motor with a reduction gear concerning this Embodiment. It is the disassembled perspective view which decomposed | disassembled the motor with a reduction gear shown by FIG.

  Hereinafter, the reduction gear-equipped motor 10 according to the present embodiment will be described with reference to the drawings. The motor 10 with a speed reducer is used as a drive source for a power window or sunroof of a vehicle (automobile), for example, and the motor 10 with a speed reducer is used as a drive source for a reclining mechanism or a lifter mechanism for a vehicle seat, for example. . As shown in FIGS. 5 and 6, the motor 10 with a speed reducer includes a motor main body 12 and a speed reducer 60 for reducing the rotation of the motor main body 12. In the drawings, the axial direction of the motor body 12 is indicated by arrows A and B, the direction orthogonal to the axial direction of the motor body 12 (hereinafter referred to as the first direction) is indicated by arrows C and D, A direction orthogonal to the first direction as viewed from the axial direction of the motor body 12 (hereinafter referred to as the second direction) is indicated by arrows E and F (see FIG. 6). In the following description, the arrow A direction is referred to as one axial direction and the other axial direction in the arrow B direction. Further, the arrow C direction is referred to as one of the first directions, and the other one of the first directions in the arrow D direction. Furthermore, the arrow E direction is referred to as the second direction one, and the second direction in the arrow F direction is referred to as the other.

(About motor body 12)
As shown in FIG. 6, the motor body 12 is configured as a so-called brushed DC motor. The motor body 12 includes a motor yoke 14 as a “yoke”, an armature 20, a brush holder 30, and a cover 50.

  The motor yoke 14 is formed in a substantially bottomed cylindrical shape opened to the other side in the axial direction. A plurality of permanent magnets (not shown) are fixed to the inner peripheral surface of the motor yoke 14, and the permanent magnets are arranged so that the magnetic poles of the permanent magnets are alternately different along the circumferential direction of the motor yoke 14. ing.

  As shown in FIG. 3, a flange 16 is formed integrally with the opening end portion 14 </ b> A of the motor yoke 14, and the flange 16 extends outward in the radial direction of the motor yoke 14. It is formed in a substantially hexagonal plate shape in which the axial direction is the plate thickness direction. Specifically, the first end surface portion 18A as a “linear end surface” constituting a part of the outer peripheral end surface of the flange 16 is disposed on one side in the first direction with respect to the motor yoke 14, and the first end surface The portion 18A extends linearly in the second direction when viewed from the axial direction of the motor yoke 14 (see FIG. 2). Further, the outer peripheral end surface of the flange 16 is inclined in a direction in which the pair of second end surface portions 18B extending from both ends of the first end surface portion 18A to the other side in the first direction and the second end surface portion 18B approach each other. It has a pair of third end surface portions 18C and a fourth end surface portion 18D that connects the tips of the pair of third end surface portions 18C.

  The flange 16 is formed with a plurality of (three in the present embodiment) fixing holes 16A for fixing a gear housing 64, which will be described later, and the fixing holes 16A are formed in a substantially circular shape to form a motor body. 12 are formed penetrating in the axial direction. Further, the surface on one side in the axial direction of the flange 16 is defined as one side surface 16B, and the surface on the other side in the axial direction of the flange 16 is defined as the other side surface 16C (see FIG. 4).

  As shown in FIG. 6, the armature 20 includes a rotating shaft 21 that constitutes an axial center portion of the armature 20, an armature core 22, an armature coil 24, and a commutator 26. 14 is accommodated in a rotatable manner. The rotating shaft 21 is formed in a substantially round bar shape and is arranged coaxially with the motor yoke 14. An end portion on one side in the axial direction of the rotary shaft 21 is rotatably supported on the bottom portion of the motor yoke 14 via a bearing (not shown). On the other hand, the rotating shaft 21 is rotatably supported by a brush holder 30 described later on the other side in the axial direction.

  The armature core 22 is disposed on the radially outer side of the rotation shaft 21 and is fixed to the rotation shaft 21. The armature core 22 is formed by laminating a plurality of plate-shaped iron core plates having a plurality of teeth. Thereby, the armature core 22 has a plurality of slots, and the slots are arranged at equiangular intervals in the circumferential direction of the rotating shaft 21. Then, an armature coil 24 is formed by sequentially winding a plurality of windings in predetermined slots of the armature core 22.

  The commutator 26 is formed in a substantially cylindrical shape, and is fixed to the rotating shaft 21 by press-fitting at a position on the other side in the axial direction with respect to the armature core 22. The commutator 26 has a plurality of commutator pieces 26A. The commutator pieces 26A are disposed along the circumferential direction of the rotating shaft 21, and the adjacent commutator pieces 26A are electrically insulated from each other. And the coil | winding wound by the predetermined slot of the armature coil 24 is electrically connected to each commutator piece 26A sequentially.

  The brush holder 30 is made of a resin material. The brush holder 30 includes a holder main body portion 32 formed in a substantially cylindrical shape, and a connector portion 36 disposed on one side in the first direction with respect to the holder main body portion 32. A press-fitting rib 34 as a “press-fitting part” is integrally formed at one end of the holder main body 32 in the axial direction. The press-fitting rib 34 is formed in a substantially cylindrical shape and protrudes from the holder main body 32 to one side in the axial direction. Then, the press-fitting rib 34 is press-fitted (inserted) into the opening end portion 14A of the motor yoke 14, and the brush holder 30 is fixed so as to close the opening portion of the motor yoke 14, and the shaft with respect to the motor yoke 14 is fixed. It protrudes in the other direction. In this state, the side surface 32 </ b> A on the one axial side of the holder main body 32 is in contact with the other side surface 16 </ b> C of the flange 16 of the motor yoke 14.

  In a state where the brush holder 30 is fixed to the motor yoke 14, the commutator 26 of the armature 20 is disposed in the holder main body portion 32. The holder main body 32 is provided with a plurality of brushes (not shown), and the brushes are in contact with the commutator 26 of the armature 20 so as to be slidable.

  The connector portion 36 is formed in a substantially bottomed rectangular tube shape that is open to one side in the axial direction, and is disposed on one side in the first direction with respect to the flange 16 of the motor yoke 14. As shown in FIG. 2, the brush holder 30 is provided with a pair of power supply terminals T, and one end of the power supply terminal T is disposed in the connector portion 36. Note that the other end of the power supply terminal T is electrically connected to the brush described above.

  As shown in FIG. 1 and FIG. 2, a protruding portion 38 that protrudes to the one side in the axial direction is formed integrally with the portion on the other side in the first direction of the connector portion 36. The projecting portion 38 is disposed adjacent to the first end surface portion 18A of the flange 16 on one side in the first direction, and extends in the second direction when viewed from the axial direction of the motor body 12. In addition, a notch 38 </ b> A opened to the other side in the first direction is formed in the longitudinal middle portion (width direction middle portion) of the protruding portion 38. Thereby, seeing from the one side in the axial direction, the protruding portion 38 is formed in a substantially U shape opened to the other side in the first direction. And both the longitudinal direction both ends (width direction both ends) of the protrusion part 38 are each used as the rotation control part 38B, and this pair of rotation control part 38B is a 1st end surface part in the surface orthogonal | vertical direction of 18 A of 1st end surface parts. It faces 18A. As a result, the rotation restricting portion 38B is in contact with the first end surface portion 18A, so that the relative rotation of the brush holder 30 with respect to the motor yoke 14 in the circumferential direction of the rotating shaft 21 is restricted.

  Further, an engagement claw 40 as an “engagement portion” is integrally formed inside the notch portion 38 </ b> A in the connector portion 36. The engagement claw 40 has an engagement piece 42 as a “main body”, and the engagement piece 42 is formed in a substantially rectangular column shape and protrudes from the bottom surface of the notch 38 </ b> A to the one side in the axial direction. In addition, it is configured to be elastically deformable in the first direction. Further, the engagement piece 42 is disposed adjacent to one side in the first direction with respect to the first end surface portion 18A of the flange 16, and a portion on the tip side of the engagement piece 42 is arranged in the first direction (first It faces the first end surface portion 18A in the direction perpendicular to the end surface portion 18A. And the part which opposes 18 A of 1st end surface parts in the engagement piece 42 is used as the contact part 42A (refer FIG. 3). For this reason, when the brush holder 30 tries to rotate relative to the motor yoke 14 in the circumferential direction of the rotating shaft 21, the contact portion 42A is configured to contact the first end surface portion 18A. Thereby, the relative rotation of the brush holder 30 with respect to the motor yoke 14 in the circumferential direction of the rotating shaft 21 is also restricted by the engaging claws 40.

  The engaging claw 40 has a claw portion 44, and the claw portion 44 protrudes from the tip end portion of the engaging piece 42 to the other side in the first direction. The claw portion 44 is disposed on one side in the axial direction with respect to the flange 16 of the motor yoke 14, and is engaged with the outer peripheral edge portion of the first end surface portion 18 </ b> A of the flange 16. Thereby, the relative movement of the brush holder 30 to the other side in the axial direction with respect to the motor yoke 14 is restricted. Further, an inclined portion 46 is formed at the tip of the claw portion 44, and the inclined portion 46 is inclined toward one side in the first direction as viewed from the second direction toward one side in the axial direction of the motor body 12. ing.

  On the other hand, as shown in FIGS. 3, 4, and 6, the holder main body 32 described above includes a pair of locking arms 32 </ b> B (see FIG. 3, 4, and 6, only the locking arm 32 </ b> B disposed on one side in the second direction is illustrated. The locking arm 32B is formed in a substantially U-shaped plate opened to one side in the axial direction when viewed from the second direction, and a portion on one side in the axial direction of the locking arm 32B is formed on the holder main body 32. Are combined.

  The cover 50 is formed in a substantially bottomed rectangular tube shape opened to one side in the axial direction of the motor body 12 and is assembled so as to cover the holder main body portion 32 of the brush holder 30 from the other side in the axial direction. Specifically, a pair of locking hook portions 52 (only one locking hook portion 52 is shown in FIGS. 3, 4, and 6) are integrally formed on the outer peripheral portion of the cover 50. The locking hook portion 52 is disposed at a position corresponding to the locking arm 32 </ b> B and protrudes outward from the cover 50. And the latch hook part 52 is arrange | positioned in the latch arm 32B, and it is latched by the latch arm 32B, The movement to the axial direction other side of the cover 50 is controlled. Thus, the holder main body portion 32 of the brush holder 30 is covered with the cover 50, and the dust prevention effect on the power feeding terminal T is enhanced by the cover 50 in the motor main body 12. Further, a hole (not shown) is formed through the bottom of the cover 50 in the axial direction of the motor body 12 so that a worm shaft 72 of a speed reducer 60 (described later) is inserted through the hole.

(About the reducer 60)
As shown in FIGS. 5 and 6, the speed reducer 60 is disposed on the other side in the axial direction with respect to the motor body 12. The speed reducer 60 includes a housing 62 that forms the outline of the speed reducer 60, and a speed reducing portion 70 is accommodated in the housing 62. Then, the rotation of the motor main body 12 is decelerated by the decelerating unit 70 and output.

  The housing 62 is formed in a substantially box shape and can be divided in the second direction. Specifically, the housing 62 includes a gear housing 64 that constitutes a portion on one side in the second direction of the housing 62, and the gear housing 64 is generally box-shaped and opened to the other side in the second direction. Is formed. The housing 62 has a housing cover 68 (see FIG. 6), and the housing cover 68 is fixed to the gear housing 64 so as to close the opening of the gear housing 64.

  As shown in FIG. 6, the gear housing 64 is integrally formed with a cover housing portion 66 for housing the above-described cover 50 of the motor body 12 (the holder body portion 32 of the brush holder 30). The cover housing portion 66 is formed in a substantially bottomed cylindrical shape opened to one side in the axial direction, and is disposed at a position facing the flange 16 of the motor yoke 14 in the axial direction of the motor body 12. Further, three fixed holes 66 </ b> A for fixing the gear housing 64 to the motor yoke 14 are formed at the tip of the cover housing portion 66. Each of the fixed holes 66A is disposed coaxially with the fixed hole 16A of the flange 16, and is formed in a concave shape having a circular cross section opened to one side in the axial direction. A female screw is formed on the inner periphery of the fixed hole 66A. Then, in a state where the cover 50 of the motor body 12 is housed in the cover housing portion 66, a screw (not shown) is inserted into the fixing hole 16A of the flange 16 from one side in the axial direction, and is inserted into the screw portion of the fixed hole 66A. It is screwed. Thereby, the gear housing 64 (reduction gear 60) is fixed to the motor yoke 14. When the gear housing 64 is fixed to the motor yoke 14, the gear housing 64 moves the brush holder 30 to the motor yoke 14 via the cover 50 so as to restrict movement of the brush holder 30 in the other axial direction. It is configured to be fixed.

  As shown in FIG. 5, the gear housing 64 accommodates a worm shaft 72 that constitutes the speed reducing portion 70. The worm shaft 72 is arranged coaxially with the rotation shaft 21 of the armature 20, and an end portion on one axial side of the worm shaft 72 can be rotated integrally with an end portion on the other axial side of the rotation shaft 21. It is connected. On the other hand, the other end of the worm shaft 72 in the axial direction is rotatably supported by the gear housing 64. Further, the gear housing 64 accommodates a worm wheel 74 that constitutes the speed reducing portion 70 in a freely rotatable manner. The worm wheel 74 is disposed with the second direction as an axial direction, and the outer peripheral portion of the worm wheel 74 is screwed into a worm formed on the outer peripheral portion of the worm shaft 72. Further, an output shaft 76 configured to rotate integrally with the worm wheel 74 is provided at the shaft center portion of the worm wheel 74. Thereby, the rotation of the motor body 12 is decelerated by the decelerating unit 70 and output from the output shaft 76.

  Next, the operation and effect of the present embodiment will be described while explaining the assembly procedure of the motor 10 with speed reducer.

  When assembling the motor 10 with a speed reducer, the motor body 12 and the speed reducer 60 are assembled in a unit state, and then the unit state speed reducer 60 is assembled to the motor body 12 in the unit state. When the motor body 12 is assembled in a unit state, the brush holder 30 is assembled to the motor yoke 14 with the armature 20 accommodated in the motor yoke 14. Specifically, the brush holder 30 is disposed on the other side in the axial direction with respect to the motor yoke 14, and the brush holder 30 is moved to the one side in the axial direction, so that the brush holder 30 (the holder main body portion 32) is press-fitted. The rib 34 is press-fitted (inserted) into the open end 14A of the motor yoke 14 (press-fitting process).

  Further, at the same time when the press-fitting rib 34 of the holder main body 32 is press-fitted into the opening end 14A of the motor yoke 14, the engaging claw 40 of the brush holder 30 is snap-fitted so that the outer peripheral edge of the flange 16 of the motor yoke 14 is. Is engaged. Specifically, in the initial press-fitting of the press-fitting rib 34, the inclined portion 46 of the claw portion 44 abuts on the other side surface 16 </ b> C side of the portion of the first end face portion 18 </ b> A of the flange 16, and toward the one axial side of the brush holder 30. With this movement, the engaging claw 40 (engaging piece 42) is elastically deformed to one side in the first direction. When the press-fitting of the press-fitting rib 34 is completed, the engaging claw 40 (engaging piece 42) is displaced to the other side in the first direction (returning to the original state), and the claw portion 44 is axially moved with respect to the flange 16. Arranged on one side. Thereby, the nail | claw part 44 is engaged with the outer-periphery edge part in the site | part of the 1st end surface part 18A of the flange 16, and the movement to the axial direction other side of the brush holder 30 is controlled (engagement process).

  In the present embodiment, the press-fitting step of press-fitting the press-fitting rib 34 of the brush holder 30 into the opening end portion 14A of the motor yoke 14 and the engaging claw 40 of the brush holder 30 on the flange 16 of the motor yoke 14 are performed. The engagement process to be engaged is a primary fixing process.

  Further, in a state where the brush holder 30 is primarily fixed to the motor yoke 14, the cover 50 is assembled to the brush holder 30 so as to cover the holder main body 32 from the other side in the axial direction. Specifically, the locking hook portion 52 of the cover 50 is disposed in the locking arm 32 </ b> B of the brush holder 30, and the cover 50 is locked to the brush holder 30. Thereby, the cover 50 is assembled | attached to the brush holder 30, and the motor main body 12 is assembled in a unit state.

  Then, the reduction gear 60 in the unit state is assembled to the motor body 12 in the unit state. Specifically, the cover 50 of the motor main body 12 is accommodated in the cover accommodating portion 66 of the gear housing 64 in the speed reducer 60, and the tip end portion of the cover accommodating portion 66 contacts the other side surface 16 </ b> C of the flange 16 of the motor yoke 14. Make contact. Next, a screw (not shown) is inserted into the fixing hole 16 </ b> A of the flange 16 from one side in the axial direction and screwed into the fixed hole 66 </ b> A of the cover housing portion 66. Thereby, the reduction gear 60 is fixed to the motor yoke 14. In this state, the gear housing 64 fixes the brush holder 30 to the motor yoke 14 via the cover 50 so as to restrict the movement of the brush holder 30 toward the other side in the axial direction (secondary fixing step). . The motor 10 with a reduction gear is assembled by the above.

  Thus, according to the motor 10 with a speed reducer of the present embodiment, the engagement claw 40 is provided on the brush holder 30, and the engagement claw 40 is engaged with the flange 16 of the motor yoke 14, so that the brush Movement of the holder 30 to the other side in the axial direction is restricted. That is, in a state where the brush holder 30 is primarily fixed to the motor yoke 14 (unit state of the motor main body 12), in addition to the brush holder 30 being fixed to the motor yoke 14 by press-fitting, the shaft of the brush holder 30 Movement to the other side of the direction is regulated by the engaging claw 40. Thereby, in the state where the brush holder 30 is primarily fixed to the motor yoke 14, even if an external force is input to the motor main body 12, the positional deviation between the brush holder 30 and the motor yoke 14 in the axial direction of the motor main body 12 is prevented. As a result, it is possible to suppress or prevent the brush holder 30 from coming off (detaching) from the motor yoke 14. As a result, for example, an assembly line (location) for primarily fixing the brush holder 30 to the motor yoke 14 and an assembly line (location) for secondary fixing the reduction gear 60 to the motor yoke 14 of the motor body 12 are different. Thus, even when the motor body 12 is conveyed in a unit state to the assembly line (place) for secondary fixing, the primary fixing state of the brush holder 30 can be stably maintained. Therefore, the productivity of the motor 10 with a reduction gear can be improved.

  The flange 16 of the motor yoke 14 has a first end surface portion 18A that extends linearly when viewed from the axial direction of the motor yoke 14, and the contact portion 42A of the engagement piece 42 of the engagement claw 40 is It is configured to be able to contact the first end surface portion 18A. For this reason, when the brush holder 30 tries to rotate in the circumferential direction of the rotation shaft 21 with respect to the motor yoke 14, the contact portion 42A of the engagement claw 40 contacts the first end surface portion 18A. Relative rotation with respect to the yoke 14 can be suppressed. Accordingly, the engagement claw 40 suppresses the relative movement of the brush holder 30 relative to the motor yoke 14 in the circumferential direction of the rotating shaft 21 while suppressing the relative movement of the brush holder 30 relative to the motor yoke 14 in the axial direction of the motor main body 12. it can. That is, the relative movement in two different directions with respect to the motor yoke 14 of the brush holder 30 can be suppressed by the engaging claws 40.

  The engaging claw 40 includes an engaging piece 42 configured to be elastically deformable in the first direction and a claw portion 44 engaged with one side surface 16B of the flange 16. The pawl 40 is engaged with the motor yoke 14 by a snap fit. Thus, when the press-fitting rib 34 of the brush holder 30 is press-fitted into the motor yoke 14, the engaging claw 40 is snap-fitted to the motor yoke 14 as the brush holder 30 moves in the press-fitting direction (one side in the axial direction). Can be engaged. Thereby, even when the engagement nail | claw 40 engaged with the motor yoke 14 is provided in the brush holder 30, it can suppress that an assembly man-hour increases.

  Further, the brush holder 30 is provided with a pair of rotation restricting portions 38B disposed on the outer side in the width direction of the engaging claw 40, and the pair of rotation restricting portions 38B are disposed to face the first end surface portion 18A. Yes. For this reason, when the brush holder 30 attempts to rotate in the circumferential direction of the rotation shaft 21 with respect to the motor yoke 14, the rotation restricting portion 38B comes into contact with the first end surface portion 18A. Thereby, relative rotation with respect to the motor yoke 14 of the brush holder 30 in the circumferential direction of the rotating shaft 21 can be further suppressed. Therefore, the primary fixed state of the brush holder 30 can be maintained more stably.

  Further, the brush holder 30 is provided with a connector portion 36 disposed on the radially outer side of the rotating shaft 21 with respect to the motor yoke 14, and an engaging claw 40 is formed in the connector portion 36. For this reason, the primary fixing state of the brush holder 30 is maintained while the connector portion 36 disposed radially outside the rotating shaft 21 with respect to the motor yoke 14 is held by the motor yoke 14 (flange 16) by the engaging claws 40. It can be maintained stably.

  The motor yoke 14 is formed in a bottomed cylindrical shape. For this reason, the shape of the motor yoke 14 can be simplified as compared with, for example, a configuration in which the cross-sectional shape of the motor yoke 14 is a track shape (substantially elliptical).

  In this embodiment, the engagement claw 40 is formed at one location on the brush holder 30, but a plurality of engagement claws 40 may be provided on the brush holder 30. For example, the added engaging claw 40 may be configured to engage with the outer peripheral edge of the flange 16 of the brush holder 30.

  In the present embodiment, the engaging claw 40 is engaged with the outer peripheral edge of the first end surface portion 18A of the flange 16, but the flange 16 with which the engaging claw 40 is engaged. This part is not limited to this. For example, you may comprise the engaging claw 40 so that it may engage with the outer periphery part in the site | part of the 2nd end surface part 18B of the flange 16, or the 3rd end surface part 18C. In other words, it is only necessary that the engaging claws 40 are configured to be engaged with a portion of the linear outer peripheral end face that intersects the radial direction of the rotating shaft 21 when viewed from the axial direction of the motor body 12.

  Further, in the present embodiment, the pair of rotation restricting portions 38B is formed in the brush holder 30, but in the brush holder 30, the rotation restricting portions 38B may be omitted.

DESCRIPTION OF SYMBOLS 10 ... Motor with reduction gear, 14 ... Motor yoke (yoke), 16 ... Flange, 18A ... 1st end surface part (linear end surface), 20 ... Armature, 20 ... Rotation Shaft 30 ... Brush holder, 34 ... Press-fitting rib (press-fitting part), 36 ... Connector part, 38B ... Rotation restricting part, 40 ... engaging claw (engaging part), 42 .. -Engagement piece (main body part), 42A ... contact part, 44 ... claw part, 60 ... speed reducer, 70 ... speed reduction part

Claims (8)

A yoke formed in a bottomed cylindrical shape;
An armature having a rotating shaft housed inside the yoke and having an axially one end rotatably supported on the bottom of the yoke;
A brush holder provided at an opening end portion of the yoke, rotatably supporting the other axial side of the rotating shaft, and having a press-fit portion press-fitted into the opening end portion of the yoke;
Provided on the other axial side of the rotating shaft with respect to the yoke, fixed to the yoke to restrict movement of the rotating shaft to the other axial side of the brush holder and coupled to the rotating shaft A speed reducer having a speed reducer that decelerates rotation of the rotating shaft;
An engagement portion that is provided on the brush holder and is engaged with the yoke and restricts movement of the rotation axis of the brush holder to the other side in the axial direction;
Equipped with a,
The yoke is formed with a flange extending from the opening end to the outside in the radial direction of the rotating shaft, and a part of the outer peripheral end surface of the flange is linear when viewed from the axial direction of the rotating shaft. A linear end surface extending to
When viewed from the axial direction of the rotating shaft, the dimension of the flange in the first direction orthogonal to the axial direction of the rotating shaft is larger than the dimension in the second direction orthogonal to the first direction. Set,
The linear end surface has a pair of parallel linear end surfaces along the first direction,
The engagement portion is a motor with a reduction gear disposed adjacent to an outer peripheral end surface of the flange on the first direction side . Before Kigakarigo unit, motor with reduction gear according to claim 1 having a contact portion that is configured to be able to abut against the straight edge surface. The engaging portion is
A main body configured to be elastically deformable in a direction perpendicular to the linear end surface;
A claw portion engaged with an outer peripheral edge portion of the linear end surface of the flange;
Comprising
The motor with a reduction gear according to claim 2, wherein the engaging portion is engaged with the yoke by a snap fit.   The motor with a reduction gear according to claim 2 or 3, wherein the brush holder is provided with a pair of rotation restricting portions arranged to face the linear end surface. The brush holder is formed with a connector portion arranged on the outer side in the radial direction of the rotating shaft with respect to the yoke,
The motor with a reduction gear according to any one of claims 1 to 4, wherein the engaging portion is formed in the connector portion.   The motor with a reduction gear according to any one of claims 1 to 5, wherein the yoke is formed in a bottomed cylindrical shape. A yoke formed in a bottomed cylindrical shape;
An armature having a rotating shaft housed inside the yoke and having an axially one end rotatably supported on the bottom of the yoke;
A brush holder provided at an opening end portion of the yoke, rotatably supporting the other axial side of the rotating shaft, and having a press-fit portion press-fitted into the opening end portion of the yoke;
Provided on the other axial side of the rotating shaft with respect to the yoke, fixed to the yoke to restrict movement of the rotating shaft to the other axial side of the brush holder and coupled to the rotating shaft A speed reducer having a speed reducer that decelerates rotation of the rotating shaft;
An engagement portion that is provided on the brush holder and is engaged with the yoke and restricts movement of the rotation axis of the brush holder to the other side in the axial direction;
With
The yoke is formed with a flange extending from the opening end to the outside in the radial direction of the rotating shaft, and a part of the outer peripheral end surface of the flange is linear when viewed from the axial direction of the rotating shaft. A linear end surface extending to
The engaging portion has a contact portion configured to be able to contact the linear end surface,
A motor with a reduction gear, wherein the brush holder is provided with a pair of rotation restricting portions disposed to face the linear end surface. It is applied to the motor with a reduction gear according to any one of claims 1 to 7 ,
A primary fixing step of press-fitting the press-fitting portion into the opening end of the yoke, and engaging the engaging portion with the yoke to primarily fix the brush holder to the yoke;
A secondary fixing step of fixing the reduction gear to the yoke after the brush holder is primarily fixed to the yoke;
A method of assembling a motor with a speed reducer.