JP2010154685A - Motor with speed reduction mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the efficiency of this motor with a speed reduction mechanism by improving coaxiality between an armature shaft and a worm shaft. <P>SOLUTION: The motor has a structure having the armature shaft 17 and the worm shaft 46 formed differently from each other and coupled by a coupling unit 52, wherein the armature shaft 17 is rotatably supported by a yoke 14 and a brush holder 31, and the worm shaft 46 is rotatably supported by a gear case 41. In this structure, four positioning pieces 33 are provided on the brush holder 31, the positioning pieces 33 abut on a regulating surface 34 provided on an opening end of the yoke 14 from the shaft direction, and the brush holder 31 is positioned in the shaft direction of the armature shaft 17 for the yoke 14. Further, a pair of positioning protrusions are provided on the gear case 41, the positioning protrusions are engaged with an engaged piece provided on the brush holder 31, and the brush holder 31 is positioned in the diameter direction of the armature shaft 17 for the gear case 41. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor with a speed reduction mechanism that includes an electric motor having an armature shaft and a speed reduction mechanism that decelerates rotation of the armature shaft and outputs it from an output shaft.

  2. Description of the Related Art Conventionally, as a drive source for a power window device, a sunroof device, or the like provided in a vehicle, a motor with a speed reduction mechanism is used as a unit by attaching a speed reduction mechanism to an electric motor.

  In such a motor with a speed reduction mechanism, the yoke of the electric motor is formed in a bottomed cylindrical shape, and a gear case for accommodating the speed reduction mechanism is fixed to the open end. As the electric motor, a motor with a brush provided with a brush and a commutator is often used. In this case, a brush holder that holds the brush is attached to the open end of the yoke. On the other hand, a worm gear mechanism that is small and has a large reduction ratio is often used as the reduction mechanism. The worm gear mechanism includes a worm and a worm wheel that meshes with the worm, and these are rotatably accommodated in a gear case. When the electric motor is operated, the worm is rotationally driven by the armature shaft, and the rotation is decelerated by the worm wheel and output from the output shaft.

  In such a motor with a speed reduction mechanism, the armature shaft is usually formed so as to reach the inside of the gear case, and the worm is integrally formed on the outer peripheral surface of the portion accommodated in the gear case of the armature shaft. However, in such a structure, a small-diameter armature shaft with rigidity that can withstand a predetermined output is used to downsize the motor, and a large-diameter worm with high rigidity that can withstand a large reduction ratio is used. Therefore, it is difficult to design the motor, and as a result, the motor with the speed reduction mechanism is hindered from being downsized. Therefore, a motor with a speed reduction mechanism has been developed in which a worm shaft provided with a worm is formed separately from an armature shaft.

For example, in Patent Document 1, an armature shaft and a worm shaft are formed separately, and a brush holder fixed by press-fitting to an opening end of the yoke and a bottom portion of the yoke rotatably support the armature shaft, and a worm is mounted on the gear case. A motor with a speed reduction mechanism is described in which a shaft is rotatably accommodated and a worm shaft is connected to an armature shaft so that power can be transmitted when a gear case is attached to an open end of a yoke.
Japanese Patent No. 3999310

  In the motor with a speed reduction mechanism shown in Patent Document 1, the brush holder is positioned by press-fitting into the yoke, thereby defining the axial direction of the armature shaft supported by the bottom of the yoke and the brush holder. On the other hand, the positioning of the brush holder with respect to the gear case is performed by sandwiching a flange portion on which a rubber seal member is mounted between the open end of the yoke and the gear case.

  For this reason, the brush holder may be displaced with respect to the gear case due to elastic deformation of the seal member, and the worm shaft supported by the gear case with respect to the armature shaft supported by the yoke and the brush holder due to the displacement. There has been a risk that the power transmission efficiency between the armature shaft and the worm shaft may be reduced due to misalignment.

  An object of the present invention is to increase the coaxiality of the armature shaft and the worm shaft, and to increase the efficiency of the motor with the speed reduction mechanism.

  A motor with a speed reduction mechanism according to the present invention is a motor with a speed reduction mechanism including an electric motor having an armature shaft and a speed reduction mechanism for decelerating the rotation of the armature shaft and outputting it from an output shaft. A yoke that is formed and rotatably supports one end of the armature shaft at the bottom, a brush holder that is press-fitted and fixed to the open end of the yoke, and that rotatably supports the other end of the armature shaft, and is held by the brush holder A plurality of brushes slidably in contact with a commutator fixed to the armature shaft, a gear case attached to the open end of the yoke, and rotatably accommodated in the gear case, and when the gear case is attached to the yoke A worm shaft connected to the armature shaft so as to be capable of transmitting power, and rotatably accommodated in the gear case. A worm wheel meshed with a worm provided on the worm shaft and constituting the speed reduction mechanism together with the worm, and a restriction provided at an opening end of the yoke and formed in a direction perpendicular to the axial direction of the armature shaft A positioning piece that is provided on the brush holder and that contacts the regulating surface of the yoke from the axial direction of the armature shaft and positions the brush holder with respect to the yoke in the axial direction of the armature shaft; A positioning projection that projects in the axial direction of the armature shaft provided on the gear case and a brush projection that is provided on the brush holder and engages with the positioning projection to position the brush holder in a direction perpendicular to the gear case. And an engaged piece to be engaged.

  The motor with a speed reduction mechanism of the present invention includes a connector unit sandwiched between the yoke and the gear case. The connector unit has an engagement hole through which the positioning projection of the gear case passes, and the brush holder has a shaft. A gripping portion that is arranged in a direction and sandwiched between the yoke and the gear case, and a power feeding connector portion that is formed integrally with the sandwiching portion and disposed outside the gear case, and is provided in the gear case. The positioning protrusion penetrates an engagement hole formed in the clamping portion of the connector unit and positions the clamping portion with respect to the gear case in the radial direction of the armature shaft.

  The motor with a speed reduction mechanism of the present invention is a male power supply terminal that protrudes in the axial direction of the armature shaft from the clamping portion and is connected to a female power supply terminal provided in the brush holder on the connector unit. An engaging projection that protrudes in the axial direction of the armature shaft from the clamping portion, engages with an engaging portion provided in the brush holder, and positions the connector unit with respect to the brush holder in the radial direction of the armature shaft; And the engagement protrusion protrudes further toward the brush holder than the male power supply terminal.

  In the motor with a speed reduction mechanism according to the present invention, the clamping portion is provided with a seal member that is in contact with the opening end of the yoke and is sandwiched between the yoke and the gear case on a radially outer side than the regulation surface. It is characterized by.

  According to the present invention, the brush holder is positioned on the yoke by bringing the positioning piece provided on the brush holder into contact with the restriction surface provided at the opening end of the yoke from the axial direction, and the engaged piece provided on the brush holder. Since the brush holder is positioned on the gear case by engaging the positioning protrusion provided on the gear case, the positioning accuracy of the brush holder with respect to both the yoke and the gear case can be improved. As a result, the coaxiality between the armature shaft rotatably supported by the yoke and the brush holder and the worm shaft rotatably supported by the gear case can be enhanced, and the efficiency of the motor with the speed reduction mechanism can be increased.

  According to the present invention, the armature shaft is provided with respect to the brush holder, the gripping portion being sandwiched between the yoke and the gear case, and the power feeding connector portion formed integrally with the sandwiching portion and disposed outside the gear case. Since the connector unit is arranged so as to be overlapped in the direction, and the connector unit is positioned with respect to the gear case by passing the positioning protrusion provided in the gear case through the engagement hole formed in the holding portion, the connector unit is Even if it is formed separately from the brush holder, the connector unit can be assembled with high accuracy without impairing the positioning accuracy of the brush holder with respect to both the yoke and the gear case.

  According to the present invention, since the engagement protrusion provided in the holding portion of the connector unit protrudes more toward the brush holder than the male power supply terminal, when assembling the connector unit and the brush holder, the male power supply terminal Before the power supply terminal is connected to the female power supply terminal of the brush holder, the engagement protrusion is engaged with the engagement part of the brush holder, and the clamping part is positioned with respect to the brush holder. The terminal can be connected to a female power supply terminal. This eliminates the need for visual inspection at the time of connecting the male power supply terminal and the female power supply terminal, and facilitates the work of assembling the connector unit to the brush holder.

  According to the present invention, the sealing portion of the connector unit is provided between the yoke and the gear case so as to seal the portion, and the sealing member is provided at the opening end of the yoke on the radially outer side than the regulating surface. Since the contact is made, even if a seal member is provided between the yoke and the gear case, it is possible to prevent displacement of the brush holder due to elastic deformation of the seal member.

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

  FIG. 1 is a cross-sectional view of a power window motor according to an embodiment of the present invention, FIG. 2 (a) is a perspective view showing a yoke and a brush holder, and FIG. 2 (b) is press-fitting the brush holder into the yoke. It is a perspective view which shows the state fixed. FIG. 3 is a perspective view showing an armature shaft and a worm shaft.

  A power window motor (motor with a speed reduction mechanism) 11 shown in FIG. 1 is used as a drive source of a power window device provided in a vehicle (not shown). The power window motor is mounted inside a door of a vehicle body and wind glass is supplied via a regulator. Open / close drive. The power window motor 11 includes an electric motor 12 and a speed reducer 13, which are assembled together to form one unit.

  The yoke 14 of the electric motor 12 is formed by pressing a steel plate so that a cross section having a pair of arcuate surfaces and a pair of planes connecting the arcuate surfaces is formed in a substantially oval shape, and one end in the axial direction is open. The other end is closed and formed into a bottomed cylindrical shape, and a flange portion 14a formed by bending in the radial direction at the opening end of the yoke 14 is integrally provided at the opening end. That is, the flange portion 14 a protrudes in the radial direction of the yoke 14 at the opening end of the yoke 14. A pair of magnets 15 are fixed to the inner surfaces corresponding to the pair of arcuate surfaces of the yoke 14, and a magnetic field is formed inside the yoke 14 by these magnets 15.

  An armature (armature) 16 accommodated in the yoke 14 includes an armature shaft 17. One end of the armature shaft 17 is supported by a bearing 18 that is fixed to the bottom portion 14 b of the yoke 14 by press-fitting, so that the armature shaft 17, that is, the armature 16 is rotatable inside the yoke 14. An armature core 19 is fixed to the armature shaft 17 so as to face the magnet 15, and a plurality of armature coils 21 are attached to the armature core 19 by overlapping winding. Further, a commutator (commutator) 22 is fixed to the armature shaft 17 adjacent to the armature core 19, and the coil ends of the armature coil 21 are respectively connected to corresponding segment pieces 22 a of the commutator 22.

  A brush holder 31 is attached to the open end of the yoke 14. The brush holder 31 is made of resin, and the outer shape of the brush holder 31 is a substantially oval shape composed of a pair of arcuate sides matched to the inner opening shape of the yoke 14 and a pair of planes connecting the arcuate sides. Has been. As shown in FIG. 2, a plurality of ribs 32 that extend in the press-fitting direction into the yoke 14 and protrude outward in the radial direction of the brush holder 31 at a predetermined height are formed uniformly in the circumferential direction on the side surface of the brush holder 31. ing. Further, the brush holder 31 is provided with four positioning pieces 33 that protrude radially outward from both arc-shaped side portions of the brush holder 31. Each of these positioning pieces 33 is formed in a flat plate shape in a direction perpendicular to the axial direction of the armature shaft 17, and overlaps with an end surface in the axial direction facing the outside of the yoke 14 of the brush holder 31. The resin material is integrally formed.

  On the other hand, the portions corresponding to the both arc-shaped side portions of the flange portion 14a provided on the yoke 14 are recessed from the surface facing the same direction as the opening end of the flange portion 14a toward the bottom portion 14b and the armature shaft 17 A restriction surface 34 perpendicular to the axial direction is formed to extend in an arc shape along the inner surface of the yoke 14. The recesses of the restricting surfaces 34 with respect to the surface of the flange portion 14 a are substantially the same as the thickness of the positioning pieces 33 provided on the brush holder 31.

  When the brush holder 31 is inserted into the opening end of the yoke 14 from the axial direction of the armature shaft 17, the ribs 32 of the brush holder 31 are pressed against the inner surface of the yoke 14 and slightly elastically deformed, and the brush holder 31 is press-fitted into the yoke 14. Will be. When the brush holder 31 is press-fitted into the yoke 14 to a predetermined position, as shown in FIG. 2B, four positioning pieces 33 provided on the brush holder 31 are provided at the opening ends of the yoke 14, respectively. Further, it contacts the corresponding restriction surface 34 from the axial direction of the armature shaft 17. The brush holder 31 is press-fitted and fixed to the opening end of the yoke 14 by elastic deformation of a plurality of ribs 32 provided on the side surface of the brush holder 31 and is positioned in the radial direction of the armature shaft 17 with respect to the yoke 14. At the same time, the four positioning pieces 33 come into contact with the regulating surface 34 of the yoke 14 in the axial direction, whereby the brush holder 31 is positioned in the axial direction of the armature shaft 17 with respect to the yoke 14.

  A bearing 35 is fixed to the shaft center of the brush holder 31, and the other end of the armature shaft 17 is rotatably supported by the bearing 35. That is, when the brush holder 31 is attached to the open end of the yoke 14, one end of the armature shaft 17 is rotatably supported on the bottom portion 14 b of the yoke 14 and the other end is rotatably supported on the brush holder 31. It has become. As a result, the armature shaft 17 is rotatable inside the yoke 14 even if the speed reducer 13 is not attached to the electric motor 12. Further, as described above, the brush holder 31 is positioned on the yoke 14, whereby the axial direction of the armature shaft 17 is defined as a normal position.

  The brush holder 31 is provided with a pair of brushes 36 that are in sliding contact with the commutator 22. These brushes 36 are held by a brush holder 31 so as to be movable back and forth toward the commutator 22. Each brush 36 is urged toward the commutator 22 by a spring 37 and is in sliding contact with the outer peripheral surface of the commutator 22. When a drive current is supplied to the pair of brushes 36, the drive current is supplied to each armature coil 21 via the commutator 22, and the electric motor 12 is activated.

  On the other hand, the speed reducer 13 includes a resin gear case 41, and the gear case 41 is fixed to the electric motor 12 by being attached to the flange portion 14 a of the yoke 14 by three bolts 42. Reference numeral 43 denotes a screw hole provided in the gear case 41, and reference numeral 44 denotes an insertion hole provided in the yoke 14. The gear case 41 and the yoke 14 are assembled by the bolts 42 with the screw holes 43 and the insertion holes 44 being combined.

  A reduction mechanism 45 is accommodated in the gear case 41. The speed reduction mechanism 45 is a so-called worm gear mechanism, and includes a worm shaft 46 and a worm wheel 47. Both ends of the worm shaft 46 are supported by bearings 48 and 49 that are press-fitted and fixed inside the gear case 41, and are rotatably accommodated in the gear case 41. A worm 46a is integrally formed on the outer periphery of the worm shaft 46. ing. The outer diameter of the portion of the worm shaft 46 where the worm 46 a is formed is larger than the outer diameter of the armature shaft 17. An output shaft 51 is fixed to the gear case 41, and the worm wheel 47 is rotatably accommodated in the gear case 41 by the output shaft 51. A gear (not shown) is formed on the outer peripheral portion of the worm wheel 47, and the outer peripheral portion of the worm wheel 47 and the worm 46a are engaged with each other.

  As shown in FIG. 3, in the power window motor 11, the armature shaft 17 and the worm shaft 46 are separately formed, that is, divided, and these shafts 17 and 46 can transmit power by the connecting unit 52. It is designed to be connected. The connecting unit 52 includes a first connecting body 53 fixed to the tip of the armature shaft 17 and a second connecting body 54 fixed to the tip of the worm shaft 46. The first connecting body 53 is a disc-shaped member having three notches 53a arranged on the outer periphery at equal intervals in the circumferential direction and projecting portions 53b formed between the notches 53a and projecting radially on the outer periphery. Formed. The second connecting body 54 is formed with three engaging claws 54a that are arranged at equal intervals in the circumferential direction and project in the axial direction, and an engaging groove 54b is formed between the engaging claws 54a. When the gear case 41 and the yoke 14 are assembled, if the gear case 41 is attached to the open end of the yoke 14, that is, the flange portion 14 a, the engaging claws 54 a of the second connecting body 54 are respectively corresponding notches of the first connecting body 53. The armature shaft 17 and the worm shaft 46 are connected so as to be able to transmit power, by engaging with the engaging groove 53b of the second connecting body 54 and with the protrusion 53b of the first connecting body 53 engaging with the engaging groove 54b of the second connecting body 54. It has become.

  With such a structure, when the electric motor 12 operates and the armature shaft 17 rotates, the rotation is transmitted to the worm shaft 46 through the connecting unit 52 and is decelerated by the speed reduction mechanism 45 and output. A pinion 55 connected to the worm wheel 47 so as to rotate together with the worm wheel 47 is pivotally supported on the output shaft 51 fixed to the gear case 41, and the pinion 55 is connected to a regulator of a power window device (not shown).

  A connector unit 61 is disposed between the brush holder 31 and the speed reducer 13, and a drive current is supplied to each brush 36 from a control device (not shown) connected to an external power source such as a battery via the connector unit 61. The

  4 (a) is a perspective view showing the connector unit and the gear case, FIG. 4 (b) is a perspective view showing a state in which the connector unit is mounted on the gear case, and FIG. It is sectional drawing which shows an engaging part.

  The connector unit 61 includes a sandwiching portion 62 and a power feeding connector portion 63 that are integrally formed with a resin material. The clamping part 62 is formed in a substantially oval outer shape matching the brush holder 31, and a seal member 64 is integrally formed on the outer peripheral part thereof by two-color molding or outsert molding. A recess 65 is provided in a portion of the gear case 41 attached to the opening end of the yoke 14, and the clamping portion 62 of the connector unit 61 is fitted into the recess 65 of the gear case 41 from the axial direction. When the connector unit 61 is attached to the gear case 41, the power feeding connector portion 63 is disposed outside the gear case 41 and the yoke 14 so as to be adjacent to the gear case 41.

  The gear case 41 is provided with a pair of positioning projections 66 that project from the bottom surface of the recess 65 toward the opening side of the recess 65 toward the axial direction of the armature shaft 17, that is, the axial direction of the worm shaft 46. The pair of positioning projections 66 are arranged point-symmetrically with respect to the worm shaft 46 and are formed of a resin material integrally with the gear case 41. On the other hand, the holding portion 62 of the connector unit 61 is provided with a pair of engagement holes 67 corresponding to the positioning protrusions 66. These engagement holes 67 pass through the clamping portion 62 in the armature axial direction, and are formed to have substantially the same size as the corresponding positioning projections 66. When the clamping portion 62 of the connector unit 61 is fitted into the recess 65 from the axial direction, each positioning projection 66 is inserted into the corresponding engagement hole 67 as shown in FIG. 4B and FIG. It penetrates the hole 67. Thereby, the clamping part 62, that is, the connector unit 61 is positioned in the radial direction of the armature shaft 17 with respect to the gear case 41 by the positioning projection 66.

  When the gear case 41 with the connector unit 61 attached is attached to the open end of the yoke 14, the holding part 62 is disposed so as to overlap the brush holder 31 in the axial direction and is provided on the outer peripheral part of the holding part 62. The sealed member 64 is held between the flange portion 14 a of the yoke 14 and the gear case 41. As described above, the holding portion 62, that is, the connector unit 61 is positioned in the radial direction with respect to the gear case 41 by the positioning protrusions 66 engaging with the engaging holes 67, and the holding portion 62 is connected to the yoke 14 and the gear case 41. Are positioned in the axial direction with respect to the gear case 41.

  In addition, when the clamping part 62, that is, the seal member 64 is clamped between the flange part 14 a of the yoke 14 and the gear case 41, foreign matter such as rainwater and dust can enter from the clamping part into the power window motor 11. Can be prevented. At this time, the seal member 64 abuts against the opening end of the yoke 14, that is, the flange portion 14 a on the outer side in the radial direction from each regulating surface 34 formed on the flange portion 14 a, and contacts the positioning piece 33 of the brush holder 31. It is made not to touch. Thereby, even if the seal member 64 is provided between the yoke 14 and the gear case 41, it is possible to prevent the positional deviation of the brush holder 31 due to the elastic deformation of the seal member 64.

  As shown in FIG. 2, a pair of engaged pieces 68 are provided on the axial end surface of the brush holder 31 on the side overlapped with the holding portion 62 so as to correspond to the positioning protrusions 66. Each of the engaged pieces 68 is formed in a wall shape that protrudes in the axial direction from the end face and is bent in an L shape on the surface of the end face, and the armature shaft 17 is inserted so that the insides of the L shapes face each other. The bearings 35 are arranged symmetrically with respect to the center. The engaged pieces 68 are each formed of a resin material integrally with the brush holder 31. When the gear case 41 with the connector unit 61 attached is attached to the open end of the yoke 14 with the brush holder 31 attached, as shown in FIG. The positioning protrusion 66 engages with the inside of the engagement piece 68 of the brush holder 31. Thereby, the brush holder 31 is positioned in the radial direction of the armature shaft 17 with respect to the gear case 41 by the positioning protrusion 66.

  As described above, in this power window motor 11, the positioning piece 33 provided on the brush holder 31 is brought into contact with the regulation surface 34 provided on the opening end of the yoke 14 in the axial direction to position the brush holder 31 on the yoke 14. The engaged piece 68 provided on the brush holder 31 is engaged with the positioning projection 66 provided on the gear case 41 so that the brush holder 31 is positioned on the gear case 41. Thereby, the brush holder 31 is accurately positioned with respect to both the yoke 14 and the gear case 41, and is rotatably supported by the armature shaft 17 and the gear case 41 that are rotatably supported by the yoke 14 and the brush holder 31. The coaxiality with the worm shaft 46 can be enhanced. Therefore, the power transmission efficiency by the connecting unit 52 between the armature shaft 17 and the worm shaft 46 can be increased, and the efficiency of the power window motor 11 can be increased.

  Further, in the power window motor 11, an engagement hole 67 is provided in the holding portion 62 of the connector unit 61 formed separately from the brush holder 31, and the positioning protrusion 66 provided in the gear case 41 passes through the engagement hole 67. Thus, since the clamping portion 62 is positioned on the gear case 41, the structure of the brush holder 31 with respect to both the yoke 14 and the gear case 41 can be achieved even if the connector unit 61 is formed separately from the brush holder 31. The connector unit 61 can be assembled to the gear case 41 with high accuracy without impairing the positioning accuracy.

  As shown in FIGS. 1 and 4, a sensor board 71 is attached to the clamping part 62 of the connector unit 61 in parallel with the armature shaft 17, and a pair of hall sensors 72 are mounted on the sensor board 71. On the other hand, a ring magnet 73 that is fixed to the second coupling body 54 and rotates together with the worm shaft 46 is provided at the tip of the worm shaft 46, and when the connector unit 61 is attached to the gear case 41, Each Hall sensor 72 is opposed to the ring magnet 73. The ring magnet 73 has a plurality of magnetic poles arranged at equal intervals in the circumferential direction. When the worm shaft 46 rotates, a pulse signal is output from each Hall sensor 72 according to the rotation of the worm shaft 46. In addition, the hall sensors 72 are arranged so that their phases are shifted by 90 degrees in the rotation direction, so that the rotation direction of the worm shaft 46 can be detected based on the generation order of the pulse signals output from the hall sensors 72. It has become.

  Each hall sensor 72 is connected to a sensor terminal 74 disposed in the power supply connector portion 63, and is connected to a control device (not shown) via an external connector (not shown) connected to the power supply connector portion 63. The control device recognizes the position and speed of the wind glass as the driven body based on the rotational speed and rotational direction of the worm shaft 46 recognized from the input pulse signal of the Hall sensor 72, and the electric motor 12. The operation of is controlled.

  In the connector unit 61, a plurality of lead plates 75 (only one is shown in FIG. 1) formed of a conductive plate material such as aluminum is embedded by insert molding, and one end of each of the lead plates 75 is embedded. Protrudes into the power supply connector portion 63, and thus a pair of power supply connection terminals 76 (only one is shown in FIG. 1) is provided in the connector portion 63. When an external connector is connected to the power feeding connector portion 63, each power connection terminal 76 is connected to the control device via the external connector. The other end of the pair of lead plates 75 embedded in the connector unit 61 protrudes in the axial direction of the armature shaft 17, that is, the worm shaft 46, from the axial end surface facing the brush holder 31 side of the holding portion 62. As a result, as shown in FIG. 4, a pair of male power supply terminals 77 are provided in the holding portion 62.

  On the other hand, as shown in FIG. 2, a pair of terminal mounting holes 78 are provided on the end surface in the axial direction facing the holding portion 62 of the brush holder 31, and the female power supply terminals 81 are respectively provided in these terminal mounting holes 78. Is installed.

  6 is a perspective view showing details of the female power supply terminal, FIG. 7 is a front view showing a state in which the female power supply terminal is mounted in the terminal mounting hole, and FIG. 8 is a line AA in FIG. It is sectional drawing which follows.

  These female-type power supply terminals 81 are formed by bending a conductive plate material such as a copper plate, for example, and are respectively wound inward so that the plate-like connecting portion 81a and the plate material face each other. And a terminal insertion portion 81b formed in a cylindrical shape. A pair of projecting pieces 81c projecting in the width direction of the insertion portion 81b in parallel with the connection portion 81a are provided on both sides of the end portion in the axial direction opposite to the connection portion 81a of the terminal insertion portion 81b. Each is provided integrally with the insertion portion 81b.

  As shown in FIG. 7, a pair of notch grooves 78 a are provided on both side surfaces in the width direction of the terminal mounting hole 78 of the brush holder 31. The female power supply terminal 81 is inserted into the mounting hole 78 from the axial direction, and is positioned in the mounting hole 78 by engaging the protruding piece 81c corresponding to each notch groove 78a. As shown in FIG. 8, a through hole 82 slightly wider than the connecting portion 81a is provided at the bottom of the terminal mounting hole 78. The female power supply terminal 81 has a terminal insertion portion 81b at the terminal mounting hole. The connecting portion 81 a is mounted in the mounting hole 78 in a state protruding from the through hole 82 to the back surface side of the brush holder 31.

  The connecting portion 81a is integrally provided with a return portion 81d protruding from the surface of the connecting portion 81a. The return portion 81d is formed with its tip directed toward the terminal insertion portion 81b, the female power supply terminal 81 is attached to the terminal attachment hole 78, and the connection portion 81a is connected to the brush holder 31 from the through hole 82. When projecting to the back surface side, as shown in FIG. 8, the brush holder 31 is locked to the back surface side. Thus, the female power supply terminal 81 is fixed to the brush holder 31 with the bottom surface portion of the terminal mounting hole 78 sandwiched between the return portion 81d and the terminal insertion portion 81b. Pigtails 83 of the corresponding brushes 36 are connected to the connection portions 81a protruding from the through holes 82 to the back side of the brush holder 31 by welding or the like.

  When the female power supply terminal 81 is mounted in the terminal mounting hole 78, each terminal insertion portion 81b is in a state of opening to the outside from the terminal mounting hole 78. When the clamping part 62 of the connector unit 61 is overlapped with the brush holder 31, each male power supply terminal 77 provided in the clamping part 62 is inserted into the terminal insertion part 81 b of the corresponding female power supply terminal 81. Connected to the terminal 81. As shown in FIG. 8, the inner surface of the terminal insertion portion 81b that is connected to the connection portion 81a is bent into a “shape” so as to protrude in the direction of narrowing the hole diameter of the insertion portion 81b. By inserting the male-shaped power supply terminal 77 and pressing the “<” shape, and elastically deforming, the terminal insertion portion 81 b is brought into elastic contact with the male power-supply terminal 77 to be sure. Connected. In this way, by connecting the male power supply terminal 77 and the female power supply terminal 81, the drive current supplied from the control device via the external connector is supplied to the power supply provided in the power supply connector portion 63. Each brush 36 can be supplied via a connection terminal 76, a pair of male power supply terminals 77 and a female power supply terminal 81.

  In order to protect the armature coil 21 from overcurrent, a PTC thermistor 84 is connected between the connecting portion 81a of one female-type power supply terminal 81 and the brush 36.

  As shown in FIG. 4, the holding portion 62 of the connector unit 61 is provided with a pair of engaging protrusions 91 protruding in the axial direction of the armature shaft 17, that is, the worm shaft 46, toward the brush holder 31 side. These engaging protrusions 91 are each formed of a resin material integrally with the sandwiching portion 62 and are arranged at point-symmetrical positions around the worm shaft 46. On the other hand, as shown in FIG. 2, the outer peripheral portions of both the arc-shaped sides of the brush holder 31 correspond to the engaging protrusions 91, respectively, as engaging portions recessed radially inward. A concavity 92 is provided. When the sandwiching portion 62 of the connector unit 61 is disposed so as to overlap the brush holder 31, the engagement protrusion 91 provided on the sandwiching portion 62 engages with the corresponding engagement recess 92, and the sandwiching portion 62 is in the brush holder. 31 is positioned in the radial direction of the armature shaft 17, that is, the worm shaft 46.

  FIG. 9 is an explanatory diagram showing a comparison of the protrusion height of the engagement protrusion provided in the holding portion and the male power supply terminal with respect to the brush holder.

  The pair of engaging protrusions 91 provided on the holding part 62 protrude from the axial end face of the holding part 62 toward the brush holder 31 by a predetermined height H1. On the other hand, the pair of male power supply terminals 77 provided in the holding part 62 are predetermined lower than the height H1 of the engaging protrusion 91 from the axial end face of the holding part 62 facing the brush holder 31 side. It protrudes by a height H2. On the other hand, the engaging recess 92 provided in the brush holder 31 and the terminal mounting hole 78 in which the female power supply terminal 81 is mounted are both provided on the same axial end surface of the brush holder 31. That is, the engagement protrusion 91 provided on the clamping part 62 protrudes from the male power supply terminal 77 on the brush holder 31 side, and when the clamping part 62 is arranged so as to overlap the brush holder 31 from the axial direction, Before the male power supply terminal 77 is connected to the female power supply terminal 81, the engagement protrusion 91 is engaged with the engagement recess 92. Thus, when the gear case 41 with the connector unit 61 attached is attached to the yoke 14 with the brush holder 31 attached, the engaging protrusions 91 engage with the engaging recesses 92 so that the holding part for the brush holder 31 is held. 62 is positioned in advance, and the male power supply terminal 77 is connected to the female power supply terminal 81 in the state where the positioning is performed.

  As described above, in the power window motor 11, the male projection terminal 91 is protruded from the male power supply terminal 77 toward the brush holder 31 side by causing the engagement protrusion 91 provided on the holding portion 62 of the connector unit 61 to protrude. Before the 77 is connected to the female power supply terminal 81 of the brush holder 31, the engaging protrusion 91 is engaged with the engaging recess 92 of the brush holder 31 so that the holding portion 62 is positioned with respect to the brush holder 31. Can do. Therefore, it is not necessary to visually check the connection between the male power supply terminal 77 and the female power supply terminal 81, and the work of assembling the gear case 41 with the connector unit 61 attached to the yoke 14 with the brush holder 31 attached is easy. Can be.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the present invention is applied to the power window motor 11 used as a drive source of the power window device. However, the present invention is not limited thereto. For example, the slide door, the back door, You may make it apply this invention to the motor with a speed-reduction mechanism used for other uses, such as the drive source of the automatic opening / closing apparatus for vehicles which drives opening / closing bodies, such as a sunroof automatically.

  In the embodiment, the connector unit 61 is formed separately from the brush holder 31. However, the present invention is not limited to this, and the connector unit 61 may be formed integrally with the brush holder 31. .

  Furthermore, in the embodiment, the seal member 64 is formed integrally with the sandwiching portion 62 by two-color molding. However, the present invention is not limited to this, and the seal member formed separately from the sandwiching portion 62 is used. It is good also as a structure which attaches 64 to the clamping part 62. FIG.

  Further, in the above-described embodiment, as the connection unit 52 for connecting the armature shaft 17 and the worm shaft 46, the first connection body 53 provided with the notch 53a and the second connection body 54 provided with the engagement claw 54a; However, the present invention is not limited to this, and other connection structures may be used as long as they are formed separately and connect the armature shaft 17 and the worm shaft 46 so that power can be transmitted. .

It is a cross-sectional view of the power window motor which is one embodiment of the present invention. (A) is a perspective view which shows a yoke and a brush holder, (b) is a perspective view which shows the state which press-fitted and fixed the brush holder to the yoke. It is a perspective view which shows an armature axis | shaft and a worm axis | shaft. (A) is a perspective view which shows a connector unit and a gear case, (b) is a perspective view which shows the state which mounted | wore the connector unit in the gear case. It is sectional drawing which shows the engaging part of a positioning protrusion, a clamping part, and a brush holder. It is a perspective view which shows the detail of a female-type electric power feeding terminal. It is a front view which shows the state with which the female-type electric power feeding terminal was mounted | worn by the terminal mounting hole. It is sectional drawing which follows the AA line in FIG. It is explanatory drawing which compares and shows the protrusion height with respect to the brush holder of the engagement protrusion provided in a clamping part, and a male type feeding terminal.

Explanation of symbols

11 Power window motor (motor with reduction mechanism)
DESCRIPTION OF SYMBOLS 12 Electric motor 13 Reduction gear 14 Yoke 14a Flange part 14b Bottom part 15 Magnet 16 Armature 17 Armature shaft 18 Bearing 19 Armature core 21 Armature coil 22 Commutator 22a Segment piece 31 Brush holder 32 Rib 33 Positioning piece 34 Restriction surface 35 Bearing 36 Brush 37 Spring 36 41 gear case 42 bolt 43 screw hole 44 insertion hole 45 speed reduction mechanism 46 worm shaft 46a worm 47 worm wheel 48, 49 bearing 51 output shaft 52 connection unit 53 first connection body 53a notch 53b protrusion 54 second connection body 54a engagement Claw 54b Engaging groove 55 Pinion 61 Connector unit 62 Holding part 63 Power supply connector part 64 Seal member 65 Recess 66 Positioning protrusion 67 Engaging hole 68 Engaged 71 Sensor board 72 Hall sensor 73 Ring magnet 74 Sensor terminal 75 Lead plate 76 Power connection terminal 77 Male power supply terminal 78 Terminal mounting hole 78a Notch groove 81 Female power supply terminal 81a Connection part 81b Terminal insertion part 81c Projection piece 81d Return portion 82 Through hole 83 Pigtail 84 PCT thermistor 91 Engaging projection 92 Engaging recess (engaging portion)
H1, H2 height

Claims (4)

A motor with a speed reduction mechanism comprising an electric motor having an armature shaft and a speed reduction mechanism for decelerating the rotation of the armature shaft and outputting from the output shaft;
A yoke that is formed in a bottomed cylindrical shape and rotatably supports one end of the armature shaft at the bottom;
A brush holder that is press-fitted and fixed to the opening end of the yoke, and rotatably holds the other end of the armature shaft;
A plurality of brushes slidably contacted with a commutator held by the brush holder and fixed to the armature shaft;
A gear case attached to the open end of the yoke;
A worm shaft rotatably accommodated in the gear case, and coupled to the armature shaft so that power can be transmitted when the gear case is attached to the yoke;
A worm wheel that is rotatably accommodated in the gear case, meshes with a worm provided on the worm shaft, and constitutes the speed reduction mechanism together with the worm;
A regulating surface provided at an opening end of the yoke and formed in a direction perpendicular to the axial direction of the armature shaft;
A positioning piece that is provided in the brush holder and abuts against the restriction surface of the yoke from the axial direction of the armature shaft to position the brush holder with respect to the yoke in the axial direction of the armature shaft;
Positioning protrusions protruding in the axial direction of the armature shaft provided in the gear case;
A motor with a speed reduction mechanism provided on the brush holder and having an engaged piece that engages with the positioning protrusion and positions the brush holder in a direction perpendicular to the armature shaft with respect to the gear case. .   2. The motor with a speed reduction mechanism according to claim 1, further comprising a connector unit sandwiched between the yoke and the gear case, wherein the connector unit has an engagement hole through which the positioning projection of the gear case passes, and the brush holder Provided in the gear case, wherein the gear case is provided with a holding portion that is disposed so as to be axially overlapped with the yoke and the gear case, and a power supply connector portion that is formed integrally with the holding portion and is disposed outside the gear case. The positioning projection is inserted through an engagement hole formed in the clamping portion of the connector unit, and the clamping portion is positioned in the radial direction of the armature shaft with respect to the gear case. .   3. The motor with a speed reduction mechanism according to claim 2, wherein the connector unit includes a male power supply terminal that protrudes from the clamping portion in an axial direction of the armature shaft and is connected to a female power supply terminal provided in the brush holder. And an engagement that projects from the clamping portion in the axial direction of the armature shaft and engages with an engagement portion provided in the brush holder to position the connector unit in the radial direction of the armature shaft with respect to the brush holder A motor with a speed reduction mechanism, wherein a protrusion is provided, and the engaging protrusion protrudes further toward the brush holder than the male power supply terminal.   The motor with a speed reduction mechanism according to any one of claims 1 to 3, wherein the clamping portion is in contact with an opening end of the yoke on a radially outer side than the restriction surface, and the yoke and the gear case A motor with a speed reduction mechanism, characterized in that a seal member sandwiched therebetween is provided.

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