JP6697987B2 - Electric motors and motors with reduction gears - Google Patents

Description

  The present invention relates to an electric motor and a motor with a reducer.

2. Description of the Related Art Conventionally, as a drive source for a power window or the like provided in an automobile, a motor with a speed reducer, in which an electric motor and a speed reducer unit that receives power from the electric motor to drive the motor, are integrated is often used. Further, among electric motors, there is an electric motor with a brush that drives the electric motor using a brush electrically connected to an external power source.
The electric motor with a brush includes a yoke having a plurality of magnets fixed to the inner peripheral surface thereof, and an armature rotatably provided inside the yoke. The armature includes a rotating shaft, an armature core fitted and fixed to the rotating shaft, a commutator, and a plurality of brushes slidably contacting the commutator. A coil is wound around the armature core, and the end of this coil is connected to the commutator.

In such an electric motor with brushes, when each brush is electrically connected to an external power supply, a current is supplied to the coil at a predetermined timing via the brush and the commutator. Then, a magnetic field is generated in the armature core, and the magnetic attraction or repulsive force generated between the magnetic field and the magnet causes the armature to continuously rotate.
Here, such a brush electric motor is provided with a connector portion for power supply in order to electrically connect each brush to an external power source. By connecting this connector portion to the external connector on the external power supply side, current is supplied to each brush from the external power supply.

  By the way, in order to improve the assemblability of the motor with a reduction gear, there is a configuration in which the electric motor and the reduction gear portion can be assembled in the same direction from the casing (for example, refer to Patent Document 1).

In addition, as a structure for fixing the connector portion for power feeding to the casing of the electric motor, a part (holding portion) of the connector portion closes a bottomed cylindrical yoke (motor case) having one end opened and the opening of the yoke. A configuration in which it is sandwiched and fixed to an end case is disclosed (for example, see Patent Document 2).
In such an electric motor, since the yoke is fastened to the end case by the bolts, the yoke and the end case are provided with yoke fixing portions each provided with a screw hole at three circumferential positions around the rotation axis. There is. These yoke fixing portions are provided so as to project radially outward of the bottomed tubular yoke.

JP 2002-354739 A JP, 2009-11077, A

By the way, in a motor with a reduction gear as disclosed in the above-mentioned Patent Document 1, for example, if an attempt is made to provide a connector portion for power feeding, the positioning of the connector portion must be taken into consideration, and the assemblability may deteriorate. It was
Further, in the electric motor as disclosed in Patent Document 2 described above, the yoke fixing portion provided so as to project radially outward of the yoke needs to be arranged at a position where it does not interfere with the connector portion. As described above, as a result of limiting the position of the yoke fixing portion, there is a possibility that it may hinder the miniaturization of the yoke and the end case, that is, the miniaturization of the electric motor.

  Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric motor and a motor with a reduction gear, which can be downsized while improving the assembling property.

The present invention adopts the following means in order to solve the above problems.
That is, the electric motor of the present invention includes a yoke, an armature having a rotating shaft rotatably provided in the yoke, a connector portion to which a harness connected to an external power source is connected, and the connector portion. A brush holder having a brush that supplies a current supplied from the external power source to the armature, and a holder housing that rotatably supports the rotation shaft around a central axis and holds the brush holder by opening in one direction. A casing having a portion, the connector portion is sandwiched between the casing and the yoke, and the connector portion extends from the sandwiching portion toward a radially outer side of the yoke and is connected to the external power source. And a connector receiving portion to which a connector provided at the tip of the harness is connected. The connector receiving portion is arranged offset to the opening direction side of the holder accommodating portion with respect to the center of the rotating shaft. In addition, the casing is arranged within the range of the radial dimension of the yoke, the casing includes a first yoke fixing portion and a second yoke fixing portion that fix the yoke, and the first yoke fixing portion includes: The second yoke fixing portion is provided on the side of the rotating shaft in the direction in which the connector receiving portion extends, and on the side of the connector receiving portion opposite to the opening direction of the holder accommodating portion. It is characterized in that it is provided on the opposite side of the first yoke fixing portion with the rotating shaft in between and on the opening direction side of the holder accommodating portion .

By thus offsetting the connector receiving portion toward the opening side of the holder accommodating portion, the brush holder and the connector portion can be easily electrically connected while inserting the brush holder from the opening side of the holder accommodating portion. . Therefore, the assemblability of the electric motor can be improved.
Further, the yoke fixing portion for fixing the yoke to the casing can be arranged on the side opposite to the direction in which the connector receiving portion is offset. Further, the connector receiving portion is offset within the range of the radial dimension of the yoke. Therefore, the casing and the electric motor can be downsized.
Further, by fixing the yokes at the two positions of the first yoke fixing portion and the second yoke fixing portion, the yoke can be fixed to the casing with a substantially uniform force with the minimum number of yoke fixing portions.
Further, the first yoke fixing portion is arranged on the side opposite to the direction in which the connector receiving portion is offset, and the second yoke fixing portion is provided on the side opposite to the first yoke fixing portion while being offset. As a result, the yoke can be securely fixed to the casing at the two diagonal positions.

  Further, in the electric motor of the present invention, the yoke is fixed to the first yoke fixing portion and the second yoke fixing portion by screw members, and the yoke is fixed to the first yoke fixing portion and the second yoke fixing portion. A rotation restricting portion that restricts rotation of the yoke forward in the tightening direction of the screw member on the outer side in the radial direction of the screw member about the rotation axis may be provided.

  With such a configuration, when the screw member is tightened to fix the yoke, it is possible to prevent the yoke from being displaced due to the rotation of the screw member. Further, since the yoke comes into contact with the rotation restricting portion, the rotation restricting portion can have the function of positioning the yoke. Further, by arranging the rotation restricting portion provided on the first yoke fixing portion on the side opposite to the direction in which the connector receiving portion is offset, the rotation restricting portion of the first yoke fixing portion has a side on which the yoke abuts. It is also possible to make the surface on the opposite side function as a connector for positioning.

  Further, in the electric motor of the present invention, the rotation restricting portion provided on the first yoke fixing portion and the rotation restricting portion provided on the second yoke fixing portion are astigmatic with respect to the rotation axis. It may be provided at symmetrical positions.

  According to such a configuration, the direction of the yoke in the rotation direction with respect to the casing is restricted, so that the yoke can be prevented from being erroneously assembled.

  Further, in the electric motor of the present invention, the brush holder has a pair of arm portions extending in parallel to each other and a connecting portion that connects the pair of arm portions to each other on the opening direction side of the holder accommodating portion. The holder accommodating portion may have a V-shaped deformation restricting portion that is provided between the pair of arm portions and restricts the pair of arm portions from deforming in a direction in which they approach each other.

  With such a configuration, it is possible to prevent the pair of arm portions from being deformed in a direction in which they approach each other when the brush holder is assembled in the holder housing portion.

  Further, in the electric motor of the present invention, the deformation restricting portion may be made of a material softer than the pair of arm portions.

  With such a configuration, when the deformation restricting portion is press-fitted between the pair of arm portions, the deformation restricting portion is deformed, so that the press-fitting margin can be secured.

  Furthermore, the motor with reduction gear of the present invention includes an electric motor as described above, a reduction gear unit including one or more gears that are rotationally driven by the rotary shaft, and a driving force generated in the reduction gear unit to the outside. And an output member for transmitting to.

  According to such a configuration, since the connector receiving portion is offset toward the opening direction side of the holder accommodating portion, the yoke fixing portion for fixing the yoke to the casing is arranged on the side opposite to the direction in which the connector receiving portion is offset. can do. As a result, the casing can be downsized, and the motor with the reduction gear can be downsized.

According to the present invention, by offsetting the connector receiving portion toward the opening direction side of the holder accommodating portion, the brush holder and the connector portion can be easily conducted while inserting the brush holder from the opening side of the holder accommodating portion. You can Therefore, the assemblability of the electric motor can be improved.
Further, the yoke fixing portion for fixing the yoke to the casing can be arranged on the side opposite to the direction in which the connector receiving portion is offset. Further, the connector receiving portion is offset within the range of the radial dimension of the yoke. Therefore, the casing and the electric motor can be downsized.

It is a perspective view showing appearance of a motor with a reducer in an embodiment of the present invention. FIG. 3 is a perspective development view showing a component structure of the motor with reduction gear in the embodiment of the present invention. It is a perspective view showing a casing which constitutes a motor with a reduction gear in an embodiment of the present invention. It is a perspective view which shows the state which removed the cover of the motor with a reduction gear in embodiment of this invention. FIG. 6 is a plan view showing a state in which the bearing provided on one side of the rotary shaft in the embodiment of the present invention is fitted in the bearing housing recess. It is a perspective view showing a brush holder stored in a motor storage part in an embodiment of the present invention. In an embodiment of the present invention, it is a plan view showing the structure of a brush holder. It is a perspective view showing a motor accommodation part formed in a casing in an embodiment of the present invention. It is a top view showing the state where the brush holder was stored in the motor storage part in the embodiment of the present invention. It is a perspective view showing the state where the connector member was set to one end of the motor accommodation part in the embodiment of the present invention. It is a figure which shows the offset state of the yoke and connector member in embodiment of this invention.

  Next, an electric motor and a motor with a speed reducer according to an embodiment of the present invention will be described with reference to the drawings.

(Motor with reducer)
FIG. 1 is a perspective view showing the external appearance of a motor 1 with a speed reducer. FIG. 2 is a perspective development view showing a component structure of the motor 1 with a reducer. FIG. 3 is a perspective view showing a casing 10 that constitutes the motor 1 with a reducer. FIG. 4 is a perspective view showing a state where the cover 8 of the motor with reduction gear 1 is removed.
As shown in FIGS. 1 to 4, a motor with reduction gear (electric motor) 1 is used, for example, in a power window device of a vehicle, and has a substantially box-shaped casing 10 having one surface opened. A cover 8 provided so as to close the opening of the casing 10, a speed reducer unit 60 accommodated in the casing 10, and a motor unit 30 provided at one end of the casing 10 and connected to the speed reducer unit 60. , Are provided.

(casing)
As shown in FIGS. 2 and 3, the casing 10 has a housing recess 11 formed on one surface thereof for housing the reduction gear unit 60. The housing recess 11 is recessed from the top surface portion 10t of the casing 10 toward the back surface portion 10b facing the top surface portion 10t. The housing recess 11 has, on its bottom surface 11b, a shaft housing groove 12 for housing a rotary shaft 61 described later, a worm wheel housing recess 21 for housing a worm wheel 63 (see FIG. 2), and a drive gear (output member) 66 ( (See FIG. 2), and a drive gear accommodating recess 22 for accommodating the drive gear accommodating recess 22.

  The shaft accommodation groove 12 is formed so as to extend in one direction along the bottom surface 11b of the accommodation recess 11. The shaft accommodating groove 12 is formed with bearing accommodating recesses 15A and 15B at positions outside the accommodating recess 11 in the shaft accommodating groove 12.

  Bearings 67A and 67B for rotatably supporting a rotary shaft 61, which will be described later, are press-fitted and accommodated in the bearing accommodating recesses 15A and 15B. One of the two bearing accommodating recesses 15A, 15B has a bearing accommodating recess 15A in the bearing accommodating recess 15A on both sides in the radial direction orthogonal to the central axis of the shaft accommodating groove 12 from the top surface portion 10t side of the casing 10. Two pairs of groove portions 15m extending toward the bottom surface 15c are formed. In the other bearing accommodating recess 15B, a pair of two pairs extending from the top surface portion 10t side of the casing 10 toward the bottom surface 15d of the bearing accommodating recess 15B on both sides in the radial direction orthogonal to the central axis of the shaft accommodating groove 12. The rib 15r is formed.

  By forming the groove portion 15m, the bearing accommodating recess 15A can be slightly elastically deformed when the bearing 67A is press-fitted into the bearing accommodating recess 15A. The rib 15r of the bearing housing recess 15B is elastically deformable. This allows the bearing 67A to be press-fitted into the bearing housing recess 15B. As described above, the bearings 67A and 67B are restricted from moving in the radial direction by the outer peripheral surfaces 67a and 67b abutting the bottom surfaces 15c and 15d of the bearing housing recesses 15A and 15B and being press-fitted.

  Further, a recess 21b into which the first shaft 13 can be press-fitted is formed in the bottom portion 21a of the worm wheel housing recess 21 at a position corresponding to the rotation axis of the worm wheel 63. The base end of the first shaft 13 is press-fitted and fixed in the recess 21b. The first shaft 13 is provided so as to be orthogonal to the bottom portion 21a and project toward the opening direction (the top surface portion 10t side) of the accommodation recess 11. A worm wheel 63 is rotatably supported at a portion protruding from the bottom portion 21a of the first shaft 13.

On the other hand, the second shaft 14 is erected on the bottom portion 22a of the drive gear housing recess 22 at a position corresponding to the rotation axis of the drive gear 66. Similarly to the first shaft 13, the second shaft 14 is also provided so as to be orthogonal to the bottom portion 22a and project toward the opening direction of the housing recess 11 (the top surface portion 10t side). A drive gear 66 is rotatably supported on the second shaft 14 as described above.
Further, the first shaft 13 and the second shaft 14 are provided on one side and the other side with the shaft housing groove 12 interposed therebetween.

  A motor accommodating portion (holder accommodating portion) 16 that accommodates a part of the motor portion 30 is formed on the outer peripheral portion of the casing 10. The motor housing portion 16 is formed in a substantially U-shaped cross section. That is, the motor accommodating portion 16 has a bottom plate portion 16a formed on the same side as the bottom surface 11b of the accommodating recess 11, and from both sides of the bottom plate portion 16a toward the opening direction of the accommodating recess 11 (the top surface portion 10t side of the casing 10). It has a pair of standing up side walls 16b and 16c.

  Further, in the casing 10, a partition wall 17 is formed between the housing recess 11 and the motor housing 16 to partition the housing recess 11 and the motor housing 16. The partition wall 17 is formed with an insertion recess 17a which is recessed from the top surface portion 10t of the casing 10 toward the rear surface portion 10b and allows the rotary shaft 61 to be inserted into the inside and outside of the casing 10. The insertion recess 17 a is formed so as to be continuous with the shaft accommodating groove 12.

  Protrusions 18 are formed at a plurality of locations on the outer peripheral portion of the casing 10. Bolt insertion holes 18h for inserting bolts (not shown) for fixing the casing 10 to the vehicle body are formed in these convex portions 18. In the present embodiment, a total of three bolt insertion holes 18h are formed and are arranged at substantially equal intervals in the circumferential direction.

Further, on the outer peripheral portion of the casing 10, locking projections 10a are formed on a pair of side wall portions 16b and 16c forming the motor housing portion 16, respectively. Further, on the outer peripheral portion of the casing 10, locking protrusions 10a are formed at a plurality of circumferentially spaced positions outside the worm wheel housing recess 21 and the drive gear housing recess 22, respectively. These locking projections 10a are for fixing the cover 8 to the casing 10 by snap-fitting.
Further, in the top surface portion 10t of the casing 10, a step portion 19 recessed to the rear surface portion 10b side from the top surface portion 10t is formed in the peripheral edge portion of the accommodation recess 11, and the step portion 19 has a substantially plate-shaped cover. 8 is fitted.

(Reducer section)
As shown in FIGS. 2 and 4, the reduction gear unit 60 is meshed with a rotary shaft 61 rotatably supported by the casing 10, a worm gear (gear) 62 integrally molded with the rotary shaft 61, and the worm gear 62. A worm wheel (gear) 63, a pinion gear (gear) 64 integrated with the worm wheel 63, a spur gear (gear) 65 meshed with the pinion gear 64, and a drive gear 66 integrated with the spur gear 65. I have it.

The rotary shaft 61 is accommodated in the shaft accommodating groove 12 of the casing 10 at a predetermined length on the other end 61b side. The portion accommodated in the shaft accommodating groove 12 is configured as the speed reducer unit 60. Bearings 67A and 67B housed in the bearing housing recesses 15A and 15B of the casing 10 are externally fitted to the rotary shaft 61 at two locations spaced apart from each other in the central axis direction. As the bearings 67A and 67B, for example, rolling bearings are used.
The rotating shaft 61 is shared with the armature 32 of the motor unit 30 by providing the armature 32 of the motor unit 30 on the one end 61a side. As a result, the rotary shaft 61 is driven to rotate about its central axis by the operation of the motor unit 30.

FIG. 5 is a plan view showing a state in which the bearing 67A provided on one side of the rotary shaft 61 is fitted in the bearing housing recess 15A.
As shown in FIGS. 3 and 5, in the bearing accommodating recess 15A on the motor accommodating portion 16 side, a positioning surface 15k orthogonal to the central axis direction of the shaft accommodating groove 12 is formed on the side closer to the accommodating recess 11. .. The bearing 67A provided on one side of the rotary shaft 61 abuts on the positioning surface 15k, thereby positioning the rotary shaft 61 in the axial direction.

  As shown in FIG. 4, the bearing accommodating recess 15B on the side away from the motor accommodating portion 16 has an opening size larger than the axial thickness of the bearing 67B. The other end 61b of the rotating shaft 61 and the bearing 67B are housed in the bearing housing recess 15B. Only the radial movement of the bearing 67B is restricted by the bottom surface 15d and the ribs 15r on both sides in the radial direction.

  As shown in FIGS. 2 and 4, the worm gear 62 is formed integrally with the rotary shaft 61 in the intermediate portion of the bearings 67A and 67B. The rotary shaft 61 provided with the worm gear 62 is arranged in the shaft housing groove 12.

  The pinion gear 64 includes a gear-shaped gear portion 64b on the outer peripheral portion. A shaft insertion hole 64h into which the first shaft 13 formed in the casing 10 is inserted is formed in the center of the pinion gear 64. The pinion gear 64 is rotatably supported around the first shaft 13 by inserting the first shaft 13 into the shaft insertion hole 64h.

  The worm wheel 63 is formed in a substantially disc shape and is housed in the worm wheel housing recess 21 of the casing 10. A gear accommodating hole 63h for accommodating and fitting a part of the pinion gear 64 in the axial direction is formed in the center of the worm wheel 63. Further, gear teeth 63 g that mesh with the worm gear 62 are formed on the outer peripheral surface of the worm wheel 63.

  The worm wheel 63 and the pinion gear 64 rotate around the first shaft 13 when the rotation shaft 61 is rotationally driven around the central axis by the motor unit 30.

The spur gear 65 is formed in a substantially disc shape and is housed in the drive gear housing recess 22 of the casing 10. Gear teeth 65 g that mesh with the pinion gear 64 are formed on the outer peripheral surface of the spur gear 65.
An insertion hole (not shown) is formed in the center of the spur gear 65 in the radial direction so as to penetrate in the central axis direction. Then, substantially fan-shaped engagement recesses 65a are formed around the insertion hole at, for example, three locations at intervals in the circumferential direction.

The drive gear 66 integrally includes a substantially disc-shaped plate portion 66a and a gear-shaped gear portion 66g formed on one surface side of the plate portion 66a.
An engagement protrusion 66t that engages with the engagement recess 65a of the spur gear 65 is provided on the opposite side of the plate portion 66a from the gear portion 66g. As a result, the drive gear 66 is housed in the drive gear housing recess 22 together with the spur gear 65.
Further, the drive gear 66 is formed with a shaft insertion hole 66h into which the second shaft 14 formed in the casing 10 is inserted. Thus, the spur gear 65 and the drive gear 66 are rotatably provided around the second shaft 14.

  Here, as shown in FIG. 3, the bottom portion 22a of the drive gear accommodating recess portion 22 is formed at a position closer to the top surface portion 10t of the casing 10 than the bottom portion 21a of the worm wheel accommodating recess portion 21. As a result, as shown in FIG. 4, the outer peripheral portion of the spur gear 65 is arranged so as to straddle above the rotary shaft 61, and is arranged above the worm wheel 63 that meshes with the worm gear 62. Then, as shown in FIG. 1, the reduction gear unit 60 is covered by the cover 8 mounted on the casing 10 except for a part of the drive gear 66.

(cover)
As shown in FIGS. 1 and 2, the cover 8 is arranged on the top surface portion 10 t side of the casing 10. The cover 8 is formed of a resin material in a substantially plate shape. The cover 8 is integrally formed with a cover body 81 that closes the housing recess 11 of the casing 10, and a motor-side cover 82 that closes the opening of the motor housing 16 on the top surface 10t side of the casing 10.

  Further, locking tongue pieces 83 are integrally formed on the outer peripheral portion of the cover 8 at positions corresponding to the locking protrusions 10 a of the casing 10. That is, a total of eight locking tongue pieces 83 are integrally formed on the outer peripheral portion of the cover 8. The locking tongue piece 83 extends toward the outer peripheral portion of the casing 10 and is configured to be locked with the corresponding locking protrusion 10a. The cover 8 is snap-fitted and fixed to the casing 10 by locking the locking tongue pieces 83 to the locking protrusions 10a.

Further, the cover body 81 is formed with an opening 85 through which the plate portion 66a and the gear portion 66g of the drive gear 66 can be inserted. The plate portion 66a and the gear portion 66g are exposed to the outside through the opening 85. Then, a window regulator or the like for opening and closing the vehicle window is engaged with the gear portion 66g.
Further, the cover body 81 is provided with a seal portion 91 on the periphery of the opening portion 85 for sealing between the opening portion 85 and the plate portion 66a. The seal portion 91 is made of, for example, rubber.

(Motor part)
As shown in FIGS. 2 and 4, as the motor unit 30, for example, a brush DC motor is used. The motor unit 30 includes a yoke 31, an armature 32 whose one end is rotatably supported by the yoke 31, a brush holder 40 holding a pair of brushes 43 for supplying electric power to the armature 32, a brush 43 and the outside. And a connector member (connector portion) 50 for electrically connecting to a power source (not shown).

  The yoke 31 is formed in a substantially bottomed tubular shape, and has a tubular portion 31 a located radially outside the armature 32. The tubular portion 31a is formed so that the shape when viewed from the axial direction is a substantially hexagon. Further, the yoke 31 is arranged such that the opening of the tubular portion 31 a faces the motor housing portion 16 side of the casing 10. A plurality of permanent magnets 31m are provided on the inner peripheral surface of the cylindrical portion 31a of the yoke 31.

  As shown in FIG. 1, a substantially rectangular flange portion 31f that spreads outward in the radial direction is integrally formed at the opening-side end of the tubular portion 31a of the yoke 31. More specifically, the flange portion 31f is formed such that its width Ls in the lateral direction (see FIG. 11) is substantially the same as the radial width of the tubular portion 31a. The longitudinal direction of the flange portion 31f substantially coincides with the direction along the surface direction of the top surface portion 10t of the casing 10.

  Protrusions 31t and 31s that protrude outward in the width direction along the top surface portion 10t of the casing 10 are formed at two diagonal portions of the flange portion 31f. 31 h of screw holes are formed in these protrusion parts 31t and 31s, respectively. The yoke 31 is fastened to the motor housing portion 16 by inserting a screw (screw member) 39 (see FIG. 11) into the screw hole 31h of the flange portion 31f and screwing the screw 39 into the motor housing portion 16. It is fixed (details will be described later).

  As shown in FIGS. 2 and 4, the armature 32 includes a rotating shaft 61, an armature core 33 externally fitted and fixed to one end 61 a of the rotating shaft 61, an armature coil 34 wound around the armature core 33, The rotary shaft 61 includes a commutator 35 that is externally fitted and fixed to the motor housing portion 16 side of the armature core 33.

  The armature core 33 is formed by laminating a plurality of substantially ring-shaped metal plates 33m in the axial direction. The armature core 33 is formed with a plurality of slots 33s for winding the armature coil 34 and teeth 33t. Then, the armature coil 34 is wound around the tooth 33t through the slot 33s.

  The commutator 35 is formed in a substantially columnar shape. On the outer peripheral surface of the commutator 35, a plurality of segments 35s made of a conductive material are attached in the circumferential direction. The armature coil 34 is electrically connected to these segments 35s.

(Brush holder)
FIG. 6 is a perspective view showing the brush holder 40 housed in the motor housing portion 16. FIG. 7 is a plan view showing the configuration of the brush holder 40.
As shown in FIGS. 6 and 7, the brush holder 40 is housed in the motor housing portion 16 of the casing 10. The brush holder 40 has a flat support plate 41. The support plate 41 is formed in a substantially U shape so as to avoid contact with the rotating shaft 61. That is, the support plate 41 includes a base portion (coupling portion) 41m that is orthogonal to the central axis direction of the rotating shaft 61 and extends in the width direction along the top surface portion 10t of the casing 10, and both width direction end portions of the base portion 41m serve as motors. It integrally has a pair of arm portions 41n, 41n extending toward the bottom plate portion 16a of the housing portion 16.

In the support plate 41, the opening 41k formed between the pair of arm portions 41n and 41n is directed toward the bottom plate portion 16a side of the motor housing portion 16, and the opening direction of the motor housing portion 16 (the bottom plate portion is between the side wall portions 16b and 16c). The casing 10 is inserted into the motor housing portion 16 from the side opposite to the side closed by 16a (the top surface portion 10t side of the casing 10). As a result, the brush holder 40 is housed in the motor housing portion 16.
Further, the support plate 41 is formed with projections 41t, 41t protruding outward in the width direction at both ends in the width direction of the base 41m.

  On the surface 41f of the support plate 41 as described above, electronic components such as a substantially rectangular tubular brush holding portion 41a and the thermistor 42 are provided. A pair of brushes 43 is held by the brush holding portion 41 a so as to be retractable toward the commutator 35. Further, the brush 43 is biased toward the commutator 35 side by the spring 44. As a result, the tip of the brush 43 is always in sliding contact with the segment 35s of the commutator 35.

  Further, the support plate 41 is provided with connection terminals 49, 49 connected to the brushes 43, 43 via the pigtails 48, 48. Here, one connection terminal 49 is connected to the thermistor 42 on the back surface 41g side of the support plate 41. The thermistor 42 and one brush 43 are connected via a pigtail 48.

  Each connection terminal 49 is provided so as to pass from the back surface 41g side of the support plate 41, pass through the outside in the width direction of one arm portion 41n, and project in the direction orthogonal to the front surface 41f. Here, the connection terminals 49, 49 are arranged at intervals in the direction in which the arm portion 41n extends.

  In order to fix the brush holder 40 to the motor accommodating portion 16, the bottom plate of the motor accommodating portion 16 is located at a position close to the partition wall 17 on each of the side wall portions 16b and 16c of the motor accommodating portion 16 from the top surface portion 10t side of the casing 10. A step portion 16d that is recessed toward the side of the portion 16a is formed.

FIG. 8 is a perspective view showing the motor housing portion 16 formed in the casing 10.
As shown in FIGS. 5 and 8, the bottom plate portion 16a of the motor housing portion 16 has a substantially rectangular parallelepiped shape protruding from the bottom plate portion 16a toward the top surface portion 10t of the casing 10 at a position along the side wall portions 16b and 16c. Locking blocks 16k, 16k are formed. The locking blocks 16k, 16k are formed so as to be separated from the partition wall 17 by a dimension substantially equal to the thickness of the support plate 41.

  Further, in the bottom plate portion 16a of the motor housing portion 16, a substantially rectangular parallelepiped intermediate block (deformation restricting portion) that protrudes from the bottom plate portion 16a toward the top surface portion 10t of the casing 10 at an intermediate portion between the side wall portions 16b and 16c. 70 is formed. The intermediate block 70 is formed at a position close to the partition wall 17 and has substantially the same thickness as the support plate 41. Further, ribs 71 extending from the bottom plate portion 16a toward the top surface portion 10t of the casing 10 are formed on both sides in the width direction of the intermediate block 70, respectively. As shown in FIG. 6, the intermediate block 70 is formed to have a width dimension that is substantially the same as the interval between the arm portions 41n and 41n of the brush holder 40.

  Here, the casing 10 having the intermediate block 70 is preferably made of a material softer than the support plate 41 of the brush holder 40. For example, there is a method in which the support plate 41 and the casing 10 are each formed of PBT (polybutylene terephthalate) resin and the casing 10 is made softer than the support plate 41. There is also a method in which the support plate 41 is made of PA66 nylon resin and the casing 10 is made of PBT resin. Besides this, various methods can be adopted.

  Thus, when the casing 10 is made of a material softer than the support plate 41, when the brush holder 40 (support plate 41) is inserted into the motor housing portion 16 of the casing 10, the casing 10 is formed on both sides in the width direction of the intermediate block 70. The ribs 71, 71 are elastically or plastically deformed. As a result, the arm portions 41n, 41n of the brush holder 40 can be press-fitted into the intermediate block 70, the positional deviation can be firmly suppressed, and the brush holder 40 can be fixed without using bolts or the like. .

  Further, as shown in FIGS. 5, 6, and 8, a terminal accommodating slit 72 for accommodating the connection terminals 49, 49 of the brush holder 40 is formed in one side wall portion 16b of the motor accommodating portion 16. The terminal accommodating slit 72 includes a width direction slit portion 72a and an axial direction slit portion 72b communicating with the width direction slit portion 72a. The width direction slit portion 72a extends outward in the width direction from a position along the partition wall 17 in the plate press-fit space 16s of the motor housing portion 16 surrounded by the bottom plate portion 16a and the side wall portions 16b and 16c. The axial slit portion 72b is formed continuously with the width slit portion 72a and opens from the partition wall 17 to the tip surface 16f of the one side wall portion 16b. In addition, inner wall surfaces 16l are formed inside the motor housing portion 16 so as to project in opposite directions to the side wall portions 16b and 16c.

  The terminal accommodating slit 72 configured as described above has a predetermined depth from the top surface portion 10t side of the casing 10 toward the bottom plate portion 16a. The terminal accommodating slit 72 is formed such that the slit bottom surface 72d is located closer to the top surface portion 10t of the predetermined size than the bottom plate portion 16a.

As shown in FIG. 6, in the brush holder 40, each protrusion 41t is engaged with the step 16d in a state where the support plate 41 is along the partition wall 17. Further, in the brush holder 40, the tip of each arm portion 41n is inserted between the locking block 16k and the partition wall 17. Further, the brush holder 40 is provided such that the tip portions of the arm portions 41n, 41n sandwich the intermediate block 70 from both sides in the width direction. Thereby, when the brush holder 40 is pushed into the motor housing portion 16, the tips of the arm portions 41n and 41n are prevented from being deformed in a direction in which they approach each other.
Further, in the state where the support plate 41 is press-fitted into the plate press-fitting space 16s as described above, the connection terminal 49 provided in the brush holder 40 is housed in the terminal housing slit 72, and its tip portion is one side wall portion 16b. It is exposed from the front end surface 16f.

  In addition, as shown in FIG. 7, the support plate 41 of the brush holder 40 is provided on the support plate 41 from the front surface 41f of the support plate 41 at a position where it abuts on the stepped portions 16d and 16d of the motor housing portion 16 and the locking blocks 16k and 16k, respectively. A protrusion 41x protruding in a direction orthogonal to each other is formed.

FIG. 9 is a plan view showing a state where the brush holder 40 is housed in the motor housing portion 16.
As shown in the figure, when the support plate 41 is press-fitted into the plate press-fitting space 16s of the motor accommodating portion 16, these protrusions 41x cause the steps 16d and 16d of the motor accommodating portion 16 and the locking blocks 16k and 16k. Hit against. This prevents the support plate 41 from rattling in the direction of the central axis of the rotating shaft 61.

(Connector member)
FIG. 10 is a perspective view showing a state where the connector member 50 is set at one end of the motor housing portion 16.
As shown in FIGS. 1, 2, and 10, the connector member 50 includes a frame portion (holding portion) 51 held between one end of the motor housing portion 16 and the yoke 31, and the frame member 51 integrally. The connector receiving portion 52 is provided.

  The frame portion 51 is formed in a substantially rectangular frame shape, and an opening 51a thereof communicates the motor housing portion 16 side and the yoke 31 side. That is, a part of the armature 32 is inserted into the opening 51a. The opening 51a is covered by mounting the yoke 31 on the frame portion 51.

  Further, the protrusions 55, 55 are integrally formed inside the frame portion 51. Each of the protrusions 55 is formed along the side wall portions 16b and 16c of the motor housing portion 16 so as to protrude toward the outer surface 10s side of the casing 10. With the connector member 50 mounted in the motor housing portion 16, the tips of the protrusions 55 are arranged to face the locking block 16k. Further, on the frame portion 51, one end of a terminal member (not shown) that can be fitted to the connection terminals 49, 49 is provided at a position corresponding to the connection terminals 49, 49 of the brush holder 40 (support plate 41). Has been done. The other end of this terminal member projects into a hood 52a of the connector receiving portion 52, which will be described later.

  The connector receiving portion 52 includes a substantially bottomed cylindrical hood 52a into which a connector (not shown) is provided, which is provided at the tip of a harness connected to an external power source such as a generator or a battery provided on the vehicle body side, and a hood. It integrally has a connecting portion 52b that connects 52a and the frame portion 51. The other end of a terminal member (none of which is shown) electrically connected to a harness side terminal provided on the connector is held in the hood 52a. By connecting a connector (not shown) of a harness connected to an external power source (not shown) to the connector receiving portion 52 of the connector member 50, the power of the external power source is supplied to the motor unit via the brush 43 and the commutator 35. 30 (armature 32) can be supplied.

FIG. 11 is a diagram showing an offset state between the yoke 31 and the connector member 50.
As shown in FIG. 11, in the connector member 50, the center C1 of the rotation shaft 61 and the yoke 31 is such that the center C2 of the hood 52a and the connecting portion 52b that form the connector receiving portion 52 is on the opening side of the motor housing portion 16. It is offset by a predetermined dimension D to (the top surface 10t side of the casing 10 opposite to the side where the bottom plate portion 16a is provided).

  Here, the hood 52a and the connecting portion 52b forming the connector receiving portion 52 are connected to the yoke 31 in a direction connecting the top surface portion 10t of the casing 10 and the bottom plate portion 16a of the motor housing portion 16 (first shaft 13, second shaft 13). It is offset within a height range of 14 axial directions). In other words, the hood 52a and the connecting portion 52b are offset within the range of the lateral width Ls of the flange portion 31f of the yoke 31 (the radial width of the tubular portion 31a of the yoke 31).

  As described above, since the connector receiving portion 52 is offset, the terminal member (not shown) passing through the inside of the connector receiving portion 52 is also offset to the opening side of the motor housing portion 16. Along with this, the connection terminal 49 of the brush holder 40 connected to the terminal member is also offset. Therefore, the terminal accommodating slit 72 of the motor accommodating portion 16 is formed such that the slit bottom surface 72d is located closer to the top surface portion 10t by a predetermined dimension than the bottom plate portion 16a. That is, the slit depth of the terminal accommodating slit 72 is set shallower by the amount that the connection terminal 49 of the brush holder 40 is offset.

As shown in FIG. 10, such a connector member 50 is provided along the bottom plate portion 16a of the motor housing portion 16 and the front end surfaces 16f (see FIGS. 6 and 8) of the side wall portions 16b and 16c.
As shown in FIG. 8, the motor housing portion 16 is provided with a protrusion (first yoke fixing portion) 75 and a protrusion (second yoke fixing portion) 76 that protrude from the tip surface 16f toward the yoke 31 side.

  One of the protrusions 75 is formed on the side wall portion 16b of the connector member 50 on the side where the connector receiving portion 52 is provided, and on the end portion on the bottom plate portion 16a side opposite to the offset direction of the connector receiving portion 52. There is. The protrusion 75 is provided with a first abutting surface 75a which is continuous with the slit bottom surface 72d of the terminal accommodating slit 72 and the slit bottom surface 72d of the terminal accommodating slit 72. In addition, a second abutting surface 75b that is orthogonal to the direction in which the side walls 16b and 16c face each other is formed on the side of the protrusion 75 that faces the side wall 16c.

  The other protrusion 76 is formed on the side wall portion 16c on the side opposite to the side on which the connector receiving portion 52 of the connector member 50 is provided. The protrusion 76 is formed on the side wall portion 16c so as to extend continuously in a direction connecting the top surface portion 10t side of the casing 10 and the bottom plate portion 16a side. The other protrusion 76 has a third abutting surface 76a formed on the side facing the side wall portion 16b, which is orthogonal to the direction in which the side wall portions 16b and 16c face each other.

  As shown in FIG. 10, the connector member 50 is sandwiched and fixed between the bottom plate portion 16a of the motor housing portion 16 and the tip surfaces 16f of the side wall portions 16b and 16c and the flange portion 31f of the yoke 31. At this time, the connector member 50 is positioned by the protrusion 55 and the inner wall surface 16l, and is restrained from being held in the direction in which the side wall portions 16b and 16c face each other and the movement toward the bottom plate portion 16a.

Further, as shown in FIG. 8, yoke fixing surfaces 75f and 76f orthogonal to the central axis direction of the rotary shaft 61 are formed on the protrusions 75 and 76. These yoke fixing surfaces 75f and 76f are formed at positions protruding toward the yoke 31 side with respect to the tip end surface 16f of the side wall portions 16b and 16c.
Further, as shown in FIG. 10, the yoke fixing surfaces 75f and 76f are located substantially in the same plane as the frame portion 51 of the connector member 50 set in the motor housing portion 16. Screw holes 75h and 76h into which screws 39 (see FIG. 11) for fixing the yoke 31 are fastened are formed in the yoke fixing surfaces 75f and 76f.

  These protrusions 75, 76 are formed with rotation preventing protrusions (rotation restricting portions) 77, 78 protruding toward the yoke 31 side with respect to the yoke fixing surfaces 75f, 76f. The rotation preventing protrusions 77, 78 are arranged radially outward of the center C1 of the yoke 31 with respect to the screw holes 75h, 76h. Further, the anti-rotation protrusions 77, 78 are arranged forward of the screw holes 75h, 76h in the screw hole 75h, 76h in the tightening direction (clockwise direction) of the screw 39.

  Further, the rotation preventing protrusions 77, 78 are formed at positions which are asymmetric with respect to the center C1 of the yoke 31 (rotating shaft 61). Specifically, the protrusions 31t and 31s of the yoke 31 are height dimensions in a direction (axial direction of the first shaft 13 and the second shaft 14) connecting the top surface portion 10t of the casing 10 and the bottom plate portion 16a of the motor housing portion 16. H1 and H2 are different from each other. The anti-rotation protrusions 77 and 78 are formed at positions corresponding to the height dimensions H1 and H2, and are asymmetric with respect to the center C1 of the yoke 31.

In the yoke 31, the protrusions 31t and 31s formed on the flange portion 31f are abutted against the yoke fixing surfaces 75f and 76g of the protrusions 75 and 76, and the screw 39 is inserted into the screw hole 31h so that the screw hole 75h, It is fixed to the motor housing portion 16 of the casing 10 by being fastened to 76h.
Further, in the yoke 31, the protrusions 31t and 31s abut against the rotation preventing protrusions 77 and 78 formed on the protrusions 75 and 76, so that when the screw 39 is tightened, the center of the yoke 31 (the center of the rotation shaft 61). Suppress the positional deviation by rotating around the (axial position).

(Assembling method of motor with reduction gear)
Next, a method for assembling the motor with speed reducer 1 will be described.
First, the armature 32, the commutator 35, and the bearings 67A and 67B are attached to the rotating shaft 61.
Next, with respect to the shaft accommodating groove 12 of the casing 10, the rotary shaft 61 is arranged along the central axis direction of the first shaft 13 and the second shaft 14 from the opening side of the accommodating recess 11 (the top surface 10t side of the casing 10). Incorporate. At this time, the bearings 67A and 67B are press-fitted into the bearing housing recesses 15A and 15B formed in the casing 10.

As shown in detail in FIG. 3, since the groove 15m is formed in the bearing accommodating recess 15A and the rib 15r is formed in the bearing accommodating recess 15B, the radial position of the rotary shaft 61 is easily and reliably positioned. It Further, as shown in detail in FIG. 5, a positioning surface 15k is formed in the bearing housing recess 15A. Therefore, the axial position of the rotary shaft 61 is easily and reliably positioned with reference to the bearing 67A and the positioning surface 15k.
By incorporating the rotary shaft 61 in this manner, the commutator 35 provided on the rotary shaft 61 is housed in the motor housing portion 16.

  Next, the worm wheel 63, the pinion gear 64, the spur gear 65, and the drive gear 66 are respectively placed in the housing recess 11 of the casing 10 from the opening side of the housing recess 11 in the central axis directions of the first shaft 13 and the second shaft 14. Install in sequence along with.

Further, the brush holder 40 is incorporated along the central axis direction of the first shaft 13 and the second shaft 14 toward the opening side of the motor housing portion 16.
Here, the brush holder 40 has a U-shape that includes a pair of arm portions 41n and 41n extending in parallel with each other and a base portion 41m that connects the pair of arm portions 41n and 41n to each other in the opening direction side of the motor housing portion 16. It is shaped. The motor accommodating portion 16 has an intermediate block 70 that is provided between the pair of arm portions 41n and 41n and that restricts the pair of arm portions 41n and 41n from deforming toward each other. Therefore, when the brush holder 40 is assembled to the motor housing portion 16, it is possible to prevent the pair of arm portions 41n, 41n from being deformed in a direction in which they approach each other.

  The intermediate block 70 is made of a material softer than the pair of arm portions 41n and 41n. When the arm portion 41n is press-fitted into the intermediate portion lock 70, the ribs 71 formed on both sides in the width direction of the intermediate block 70 are deformed, whereby the press-fitted state can be achieved. As a result, the brush holder 40 can be fixed only by press fitting it into the motor housing portion 16 without using bolts or the like.

  Next, the cover 8 is attached so as to cover the top surface portion 10t of the casing 10. Here, the cover 8 is snap-fitted and fixed by the locking tongue piece 83 formed on the cover body 81 and the locking projection 10a formed on the casing 10.

Next, the connector member 50 is assembled to the motor housing portion 16 along the central axis direction of the rotating shaft 61. When the connector member 50 is assembled, the connector member 50 and the brush holder 40 are electrically connected.
Then, the yoke 31 is attached to the end of the motor housing portion 16. Specifically, the yoke 31 is fixed to the protrusion 75 and the protrusion 76 of the motor housing portion 16 with screws 39, respectively. When the screw 39 is tightened, the yoke 31 tries to rotate slightly so as to follow it.

  Here, since the rotation stopper protrusions 77 and 78 are provided on the protrusions 75 and the protrusions 76 of the motor housing portion 16, when the screw 39 is tightened, the protrusion portions 31t and 31s of the yoke 31 are attached to the rotation stopper protrusions 77 and 78. While being pressed, the yoke 31 is fastened and fixed by the screw 39. In this way, the rotation preventing protrusions 77 and 78 act as positioning portions in the rotation direction of the yoke 31. That is, the rotation preventing protrusions 77 and 78 function as the positioning faces 77a and 78a on the surfaces on the side in contact with the protrusions 31t and 31s of the yoke 31. Further, of the two rotation preventing projections 77, 78, the surface opposite to the positioning surface 77a of the rotation preventing projection 77 functions as a first abutting surface 75a that guides when the connector member 50 is inserted.

  Further, the rotation stop projection 77 provided on the projection 75 and the rotation stop projection 78 provided on the projection 76 are provided at positions that are not point symmetrical with respect to the rotation shaft 61. For this reason, the direction of the yoke 31 in the rotational direction with respect to the casing 10 is restricted, so that the yoke 31 is prevented from being erroneously assembled.

(Operation of motor with reduction gear)
Next, the operation of the motor with reduction gear 1 will be described.
First, when the motor unit 30 is driven, the worm wheel 63 rotates via the rotary shaft 61 and the worm gear 62. The rotating shaft 61 and the worm gear 62 are rotatably supported by bearings 67A and 67B.

Subsequently, when the rotating shaft 61 and the worm gear 62 rotate, the drive gear 66 rotates together with the worm wheel 63. Then, from the gear portion 66g of the drive gear 66, for example, a driving force for moving up and down the vehicle window can be output.
Here, the reduction gear unit 60 is decelerated in two stages by the meshing of the worm gear 62 and the worm wheel 63 and the meshing of the pinion gear 64 and the spur gear 65.

  As described above, the connector member 50 of the motor 1 with a reduction gear described above has the frame portion 51 sandwiched between the casing 10 and the yoke 31, and extends from the frame portion 51 toward the outer side in the radial direction of the yoke 31, and is externally connected. And a connector receiving portion 52 to which a connector provided at the tip of the harness connected to the power source is connected. The connector receiving portion 52 is arranged offset from the center C1 of the yoke 31 (rotating shaft 61) toward the opening of the motor housing portion 16. The connector receiving portion 52 is offset within the radial width of the tubular portion 31 a of the yoke 31.

  Therefore, the protrusion 75 for fixing the yoke 31 to the casing 10 can be arranged on the side opposite to the direction in which the connector receiving portion 52 is offset. Further, the connector receiving portion 52 is offset within the range of the radial dimension of the yoke 31. Therefore, the connector receiving portion 52 may protrude from the casing 10 in the direction connecting the top surface portion 10t of the casing 10 and the bottom plate portion 16a of the motor housing portion 16 (the axial direction of the first shaft 13 and the second shaft 14). Therefore, the casing 10 and the motor with reduction gear 1 can be downsized.

  Further, since the brush holder 40 is installed toward the opening side of the motor housing portion 16 along the central axis direction of the first shaft 13 and the second shaft 14, the brush holder 40 can be easily assembled. In addition to this, since the connection terminal 49 of the brush holder 40 and the terminal member (not shown) of the connector member 50 can be connected on the opening side of the motor housing portion 16, the connectivity between the brush holder 40 and the connector member 50 is improved. Can be improved.

  Further, since the connector receiving portion 52 is offset, the terminal member (not shown) passing through the inside of the connector receiving portion 52 is also offset to the opening side of the motor accommodating portion 16. Along with this, the connection terminal 49 of the brush holder 40 connected to the terminal member is also offset. Therefore, the terminal accommodating slit 72 of the motor accommodating portion 16 is formed such that the slit bottom surface 72d is located closer to the top surface portion 10t by a predetermined dimension than the bottom plate portion 16a. That is, the slit depth of the terminal accommodating slit 72 is set shallower by the amount that the connection terminal 49 of the brush holder 40 is offset. The rigidity of the motor housing portion 16 (casing 10) can be increased because the slit depth of the terminal housing slit 72 is shallow.

Further, the casing 10 includes a protrusion 75 and a protrusion 76 for fixing the yoke 31, the protrusion 75 is provided on the side of the rotation shaft 61 in the direction in which the connector receiving portion 52 extends, and the protrusion 76 rotates with respect to the protrusion 75. It is preferably provided on the opposite side of the shaft 61.
According to such a configuration, by fixing the yoke 31 at the two positions of the protrusion 75 and the protrusion 76, the yoke 31 can be fixed to the casing 10 with a substantially uniform force by the minimum number of protrusions 75 and 76. it can.

  Further, the protrusion 75 is provided on the side of the connector receiving portion 52 opposite to the opening direction of the motor housing portion 16, and the protrusion 76 is provided on the opening direction side of the motor housing portion 16. That is, the protrusion 75 is arranged on the side opposite to the direction in which the connector receiving portion 52 is offset, and the protrusion 76 is arranged offset on the side opposite to the protrusion 75. As a result, the yoke can be reliably fixed to the casing at the two diagonal positions.

  The yoke 31 is fixed to the protrusion 75 and the protrusion 76 by screws 39, respectively. The protrusion 75 and the protrusion 76 are provided with detent protrusions 77 and 78 that restrict the rotation of the yoke 31 forward in the tightening direction of the screw 39 on the radial outer side of the screw 39. ing. Therefore, when tightening the screw 39 to fix the yoke 31, it is possible to prevent the yoke 31 from being displaced due to the rotation of the screw 39. In addition to this, since the anti-rotation protrusions 77 and 78 act as positioning portions in the rotation direction of the yoke 31, the yoke 31 can be easily positioned.

Further, the rotation stop projection 77 provided on the projection 75 and the rotation stop projection 78 provided on the projection 76 are provided at positions that are not point symmetrical with respect to the rotation shaft 61.
According to such a configuration, the direction of the yoke 31 with respect to the casing 10 in the rotational direction is restricted, so that the yoke 31 can be prevented from being erroneously assembled.

Further, the brush holder 40 has a U shape having a pair of arm portions 41n and 41n extending parallel to each other and a base portion 41m connecting the pair of arm portions 41n and 41n to each other on the opening direction side of the motor housing portion 16. It is said that. The motor accommodating portion 16 has an intermediate block 70 that is provided between the pair of arm portions 41n and 41n and that restricts the pair of arm portions 41n and 41n from deforming toward each other.
With such a configuration, when the brush holder 40 is assembled to the motor housing portion 16, it is possible to prevent the pair of arm portions 41n, 41n from being deformed in a direction in which they approach each other.

The intermediate block 70 is made of a material softer than the pair of arm portions 41n and 41n.
With such a configuration, when the intermediate block 70 is press-fitted between the pair of arm portions 41n, 41n, the intermediate block 70 is deformed, so that the press-fitting margin can be secured. As a result, the brush holder 40 can be fixed only by press fitting it into the motor housing portion 16 without using bolts or the like. That is, it is not necessary to secure a space for fastening the bolts for fixing the brush holder 40, which contributes to downsizing of the motor 1 with a speed reducer.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the method for assembling the motor 1 with a speed reducer according to the present invention has been described. You may.

Further, the configuration of each part of the motor with reduction gear 1 can be changed as appropriate. For example, the speed reducer unit 60 is provided with the first shaft 13 and the second shaft 14, but one or three or more shafts may support gears forming the speed reducer unit. .
Further, the configuration including the reduction gear unit 60 is not essential, and an electric motor that does not include the reduction gear may be used.

  Moreover, in the above-described embodiment, the case where the motor 1 with a speed reducer is applied to the electric motor as the drive source of the wiper arm of the vehicle has been described. However, the present invention is not limited to this, and the motor with speed reducer 1 may be applied to various devices such as power window devices, window regulators, sunroofs, drive sources such as electric seats, and electrical components other than vehicles. Is possible.

1 Motor with reducer (electric motor)
10... Casing 16... Motor housing (holder housing)
30... Motor part 31... Yoke 32... Armature 34... Armature coil 35... Commutator 39... Screw (screw member)
40... Brush holder 41m... Base part (connecting part)
41n... Arm part 43... Brush 50... Connector member (connector part)
51... Frame part (holding part)
52... Connector receiving portion 60... Reduction gear portion 61... Rotating shaft 62... Worm gear (gear)
63... Worm wheel (gear)
64... Pinion gear
65... spur gear
66... Drive gear (output member)
70... Intermediate block (deformation control section)
71... Ribs 75... Protrusions (first yoke fixing portion)
76... Protrusion (second yoke fixing part)
77... Anti-rotation protrusion (rotation restriction part)
78... Anti-rotation protrusion (rotation restricting part)

Claims (6)

York and
An armature having a rotation shaft rotatably provided in the yoke,
A connector part to which a harness connected to an external power supply is connected,
A brush holder having a brush that supplies a current supplied from the external power source to the armature via the connector section;
A casing having a holder accommodating portion that supports the rotation shaft rotatably around a central axis and is open in one direction to hold the brush holder,
Equipped with
The connector section is
A sandwiching portion sandwiched between the casing and the yoke,
A connector receiving portion that extends from the sandwiching portion toward the outside in the radial direction of the yoke, and to which the connector provided at the tip of the harness connected to the external power source is connected;
The connector receiving portion is arranged offset with respect to the center of the rotation shaft on the opening direction side of the holder housing portion, and is arranged within the range of the radial dimension of the yoke ,
The casing includes a first yoke fixing portion and a second yoke fixing portion that fix the yoke,
The first yoke fixing portion is provided on a side of a direction in which the connector receiving portion extends with respect to the rotating shaft, and is provided on a side opposite to an opening direction of the holder receiving portion with respect to the connector receiving portion,
The second yoke fixing portion is provided on the opposite side of the first yoke fixing portion with the rotating shaft interposed therebetween, and is provided on the opening direction side of the holder accommodating portion. Electric motor to The yoke is fixed to each of the first yoke fixing portion and the second yoke fixing portion by a screw member,
The first yoke fixing portion and the second yoke fixing portion have rotations for restricting rotation of the yoke forward in the tightening direction of the screw member on the outer side in the radial direction with respect to the screw member about the rotation axis. The electric motor according to claim 1 , further comprising a restriction portion. The rotation restricting portion provided on the first yoke fixing portion and the rotation restricting portion provided on the second yoke fixing portion are provided at non-point symmetrical positions about the rotation axis. The electric motor according to claim 2, which is characterized in that. The brush holder is a U-shape having a pair of arm portions extending in parallel with each other and a connecting portion connecting the pair of arm portions to each other on the opening direction side of the holder housing portion,
The holder accommodating portion includes a deformation regulating portion that is provided between the pair of arm portions and that restrains the pair of arm portions from deforming in directions toward each other. electric motor according to any one of claims 3 to 1. The electric motor according to claim 4 , wherein the deformation restricting portion is formed of a material softer than the pair of arm portions. An electric motor according to any one of claims 1 to 5,
A speed reducer unit having one or more gears that are rotationally driven by the rotary shaft;
An output member for transmitting the driving force generated in the speed reducer unit to the outside, a motor with a speed reducer.

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