Geared motor

Abstract

To provide a geared motor in which a wiring board is fixed to an outer peripheral side of a motor through a holder without a great increase in assembling man-hours and addition of a new component.SOLUTION: In a geared motor 1, a resin holder 7 fixed to a motor 10 holds a gear box 2 arranged on an output side L1 in a rotation axis L direction relative to the motor 10, and a wiring board 3 arranged on an outer peripheral side of the motor 10. The wiring board 3 is connected to a first terminal 152, and a second terminal 154. A holder 7 has a gear box support part 71 overlapping an end on an output side L1 of the motor 10, and a substrate support part 76 which extends to the outer peripheral side of the motor 10 from the gear box support part 71, and supports the wiring board 3 from the inside in a radial direction. The gear box support part 71 and a first terminal 12 of the motor 10 are fixed to each other by engagement, and a gear housing 20 and the gear box support part 71 are fixed to each other by engagement.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a geared motor in which a gear mechanism is integrally provided on a motor.

Background Art

[0002] There has been proposed a geared motor in which a gearbox is integrally provided for a motor (see Patent Document 1). On the other hand, in order to prevent deformation of terminals and the like when connecting a wiring board to the terminals of a motor on the outer peripheral side of the motor, a structure has been proposed in which a holder is fixed to the side surface of the motor and the wiring board is held by the holder (see Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventors of the present application propose a new type of geared motor in which a wiring board is fixed to the outer peripheral side of a motor via a holder even in a geared motor. However, when the wiring board is provided on the outer peripheral side of the motor via the holder, there are many restrictions when fixing the gearbox to the motor. For this reason, there is a problem that it is not easy to realize a structure in which the wiring board is fixed to the outer peripheral side of the motor via the holder, such as a significant increase in the number of assembly steps and the addition of new parts to fix the gearbox to the motor.

[0005] In view of the above problems, an object of the present invention is to provide a geared motor in which a wiring board is fixed to the outer peripheral side of a motor via a holder without a significant increase in the number of assembly steps or the addition of new parts.

Means for Solving the Problem

[0006] In order to solve the above problems, in the present invention, a geared motor includes a motor, a gear box disposed on the output side of the rotation center axis with respect to the motor, a wiring board disposed on the outer peripheral side of the motor, and a holder fixed to the motor and holding the gear box and the wiring board.

[0007] In the present invention, by using a holder for fixing a wiring board on the outer peripheral side of the motor to hold the gear box on the output side of the motor, it is possible to provide a geared motor in which the wiring board is fixed to the outer peripheral side of the motor via the holder without a significant increase in the number of assembly steps or the addition of new parts. Therefore, it is possible to provide a geared motor in which the wiring board is fixed to the outer peripheral side of the motor via the holder at low cost.

[0008] In the present invention, the holder may adopt an aspect including a gear box support portion overlapping an end portion on the output side of the motor, and a board support portion extending from the gear box support portion to the outer peripheral side of the motor and supporting the wiring board from the inner side in the radial direction. According to such an aspect, the gear box and the wiring board can be held by a holder having a simple configuration.

[0009] In the present invention, the motor may adopt an aspect including a first engaging portion that engages with the gear box support portion and holds the gear box support portion.

[0010] In the present invention, the gear box support portion includes a plurality of first engaging convex portions protruding toward the motor side, and the first engaging portion may adopt an aspect including a plurality of first engaging holes into which the plurality of first engaging convex portions enter and engage from the output side. According to such an aspect, the holder can be fixed to the motor by pressing the gear box support portion against the motor side.

[0011] In the present invention, the motor can adopt an embodiment in which an end plate for holding a bearing is provided at the end on the output side, and the plurality of first engaging holes are provided in the end plate.

[0012] In the present invention, the gearbox can adopt an embodiment including a plurality of gears and a gear housing that houses the plurality of gears inside, and the gearbox support portion includes a second engaging portion that engages with the gear housing to hold the gear housing.

[0013] In the present invention, the gear housing is provided with a plurality of second engaging holes penetrating in the radial direction, and the second engaging portion can adopt an embodiment including a plurality of second engaging protrusions that enter and engage with the plurality of second engaging holes from the radially inner side. According to such an embodiment, when the gear housing is pressed against the gearbox support portion, the second engaging protrusions engage with the second engaging holes, so that the gear housing can be fixed to the gearbox support portion.

[0014] In the present invention, a washer can be arranged between the gearbox and the gearbox support portion, and an embodiment can be adopted in which an end portion on the radially outer side of the washer is clamped between the gear housing and the gearbox support portion. According to such an embodiment, when the gearbox and the holder fixed to the motor are coupled, the washer can be fixed.

[0015] In the present invention, the plurality of gears can adopt an embodiment including a planetary gear that meshes with an internal gear formed on the inner peripheral surface of the gear housing.

[0016] In the present invention, the motor includes a terminal block and a plurality of pin-shaped terminals protruding radially outward from the terminal block. The substrate support portion is provided with an opening for protruding the plurality of terminals radially outward, and the wiring substrate is provided with a plurality of through holes into which the plurality of terminals are fitted.

[0017] In the present invention, the holder is made of resin. The wiring board is provided with a third engagement hole penetrating the wiring board. The board support portion is provided with a third engagement convex portion that fits into the third engagement hole. A portion of the third engagement convex portion protruding from the third engagement hole may be deformed so as to overlap the wiring board from the radially outer side. According to such an aspect, after fitting the third engagement convex portion into the third engagement hole, the wiring board can be fixed to the holder by deforming the third engagement convex portion by thermal welding.

[0018] In the present invention, in the holder, a region overlapping the wiring board is a concave portion recessed radially inward, and an end portion of the wiring board is in contact with a side wall of the concave portion. According to such an aspect, the wiring board can be reliably fixed to the holder.

[0019] In the present invention, the wiring board may be adopted in a manner that it faces the outside in the radial direction with a gap with respect to a portion corresponding to the base of the terminal in the terminal block. According to such an aspect, since the wiring board does not apply a large stress to the coil wire wound around the base of the terminal, disconnection of the coil wire can be suppressed.

Effect of the Invention

[0020] In the present invention, in order to fix the wiring board to the outer peripheral side of the motor, a holder for holding the gearbox on the output side of the motor is used. Without a significant increase in the number of assembly steps or the addition of new parts, a geared motor in which the wiring board is fixed to the outer peripheral side of the motor via a holder can be provided. Therefore, a geared motor in which the wiring board is fixed to the outer peripheral side of the motor via a holder can be provided at low cost.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0022] With reference to the drawings, an example of the geared motor 1 to which the present invention is applied will be described. In the following description, among both sides in the direction of the rotation axis line L along which the rotation center axis line L of the motor 10 extends, the side where the gear box 2 is provided is the output side L1, and the side opposite to the side where the gear box 2 is provided is the reverse output side L2. Also, when explaining the wiring board 3 etc., CW will be attached to one side around the rotation center axis line L and CCW will be attached to the other side for explanation.

[0023] (Overall Configuration of the Geared Motor 1) Fig. 1 is a perspective view of the geared motor 1 to which the present invention is applied. Fig. 2 is a side view of the geared motor 1 shown in Fig. 1. Fig. 3 is a cross-sectional view of the geared motor 1 shown in Fig. 1. Fig. 3 shows a cross-section of the geared motor 1 cut along the rotation center axis line L. Fig. 4 is an exploded perspective view showing the state of removing the gear housing 20 from the geared motor 1 shown in Fig. 1.

[0024] As shown in FIGS. 1, 2, 3, and 4, the geared motor 1 of this embodiment includes a motor 10, a gear box 2 disposed on the output side L1 in the direction of the rotation axis L with respect to the motor 10, a wiring board 3 disposed on the outer peripheral side of the motor 10, and a holder 7 fixed to the motor 10. The holder 7 holds the gear box 2 and the wiring board 3. That is, the gear box 2 is held on the output side L1 of the motor 10 by using the holder 7 for fixing the wiring board 3 on the outer peripheral side of the motor 10. Therefore, it is possible to provide the geared motor 1 in which the wiring board 3 is fixed to the outer peripheral side of the motor 10 via the holder 7 without significantly increasing the number of assembly steps or adding new parts. Therefore, the geared motor 1 in which the wiring board 3 is fixed to the outer peripheral side of the motor 10 via the holder 7 can be provided at low cost.

[0025] The motor 10 has a cylindrical stator 4, a metal first end plate 12 fixed to the first end 11 on the output side L1 of the stator 4 by a method such as welding, and a metal second end plate 14 fixed to the second end 13 on the opposite output side L2 of the stator 4 by a method such as welding. Therefore, the motor 10 includes the first end plate 12 and the second end plate 14 on both sides in the direction of the rotation center axis L. In the motor 10, a power supply unit 15 including a wiring board 3 or the like is provided on the radially outer side of the stator 4 constituting the motor body. In the power supply unit 15, an external power supply member 19 is connected to the other end CCW in the circumferential direction of the wiring board 3. In this embodiment, the power supply member 19 is a connector 190.

[0026] (Configuration of the motor 10) As shown in FIG. 3, the motor 10 is a stepping motor. In the stator 4, the stator 4A for the A phase on the output side L1 and the stator 4B for the B phase on the reverse output side L2 are arranged overlappingly in the direction of the rotation center axis L. For this reason, in the stator 4, the first coil bobbin 42A around which the first coil 46A is wound and the second coil bobbin 42B around which the second coil 46B is wound are arranged overlappingly in the direction of the rotation center axis L. On both sides of the first coil bobbin 42A in the direction of the rotation center axis L, an annular inner stator core 43A and an annular outer stator core 44A are arranged overlappingly. On both sides of the second coil bobbin 42B in the direction of the rotation center axis L, an annular inner stator core 43B and an annular outer stator core 44B are arranged overlappingly. On the inner peripheral surfaces of the first coil bobbin 42A and the second coil bobbin 42B, a plurality of pole teeth 45 of the inner stator cores 43A, 43B and the outer stator cores 44A, 44B are arranged side by side in the circumferential direction. In this embodiment, the outer peripheral side portion of the outer stator core 44A extends to the radially outer side of the first coil bobbin 42A and the second coil bobbin 42B to form the motor case 41. Therefore, the first end portion 11 on the output side L1 of the stator 4 is composed of the annular portion 47 of the outer stator core 44A. The second end portion 13 on the reverse output side L2 of the stator 4 is composed of the annular portion 48 of the outer stator core 44B.

[0027] A rotor 5 is coaxially arranged inside the stator 4 in the radial direction. In the rotor 5, a rotating shaft 50 extends along the rotation center axis L, and the rotating shaft 50 protrudes from the first end plate 12 to the output side L1. A cylindrical permanent magnet 59 is fixed by an adhesive or the like at a position closer to the reverse output side L2 of the rotating shaft 50. The outer peripheral surface of the permanent magnet 59 faces the pole teeth 45 of the stator 4 with a predetermined interval inside the stator 4 in the radial inner side.

[0028] The rotating shaft 50 is rotatably supported by a first bearing 61 held by the first end plate 12. A washer 66 through which the rotating shaft 50 passes is disposed between the first bearing 61 and the permanent magnet 59. On the reverse output side L2 of the motor 10, the rotating shaft 50 is rotatably supported by a second bearing 62 held by the second end plate 14. An annular washer 67 through which the rotating shaft 50 passes is disposed between the second bearing 62 and the permanent magnet 59.

[0029] (Configuration of the gear box 2) FIG. 5 is an exploded perspective view showing the gears and the like shown in FIG. 4. As shown in FIGS. 3, 4, and 5, the gear box 2 includes a plurality of gears described below and a cylindrical gear housing 20 that houses the plurality of gears therein, and a serration portion 250 of the output member 25 protrudes from the gear housing 20 to the output side L1. In the present embodiment, the plurality of gears includes planetary gears that mesh with an internal gear 201 formed on the inner peripheral surface of the gear housing 20, and three-stage planetary gear mechanisms 21, 22, and 23 are configured along the rotation center axis L inside the gear housing 20. Therefore, the rotation of the motor 10 is decelerated and transmitted to the output member 25.

[0030] The first-stage planetary gear mechanism 21 is composed of a sun gear 210 fixed to the rotating shaft 50 of the motor 10, a planetary carrier 211, a total of three planetary gears 212 rotatably held by the planetary carrier 211, and an internal gear 201 provided on the inner peripheral surface of the gear housing 20. The second-stage planetary gear mechanism 22 is composed of a sun gear 220 provided on the planetary carrier 211 of the previous-stage planetary gear mechanism 21, a planetary carrier 221, a total of three planetary gears 222 rotatably held by the planetary carrier 221, and an internal gear 201 provided on the inner peripheral surface of the gear housing 20. The third-stage planetary gear mechanism 23 is composed of a sun gear 230 provided on the planetary carrier 221 of the previous-stage planetary gear mechanism 22, a planetary carrier 231, a total of three planetary gears 232 rotatably held by the planetary carrier 231, and an internal gear 201 provided on the inner peripheral surface of the gear housing 20. Here, the planetary Carrier 231 is configured as part of the output member 25.

[0031] (Configuration of the first terminal block 151 and the second terminal block 152) FIG. 6 is an exploded perspective view showing a state in which the wiring board 3 and the like are removed from the motor 10 shown in FIG. 4. As shown in FIGS. 3 and 6, the motor case 41 is provided with a notch 410 that cuts out a part in the circumferential direction. In the first coil bobbin 42A, at an angular position corresponding to the notch 410, a first terminal block 151 is provided at the radially outer end of the flange portion 420A on the reverse output side L2. Two pin-shaped first terminals 152 are held at positions spaced apart in the circumferential direction on the first terminal block 151. The radially outer end of the first terminal block 151 and the two first terminals 152 project radially outward from the notch 410. In the second coil bobbin 42B, at an angular position corresponding to the notch 410, a second terminal block 153 is provided at the radially outer end of the flange portion 420B on the reverse output side L2. Two pin-shaped second terminals 154 are held at positions spaced apart in the circumferential direction on the second terminal block 153. After the ends of the first coil 46A and the second coil 46B are wound together, they are fixed with solder.

[0032] The radially outer end of the first terminal block 151, the two first terminals 152, the radially outer end of the second terminal block 153, and the two second terminals 154 project radially outward from the notch 410, and the first terminals 152 and the second terminals 154 are connected to the wiring board 3 arranged so as to face the radially outer end faces of the first terminal block 151 and the second terminal block 153. More specifically, four through holes 36 through which the first terminals 152 and the second terminals 154 pass are formed in the wiring board 3, and the first terminals 152 and the second terminals 154 are connected to lands 37 formed around the four through holes 36 by solder (not shown).

[0033] On the radially outer surfaces of the first terminal block 151 and the second terminal block 153, portions 151a and 153a corresponding to the roots of the first terminal 152 and the second terminal 154 are low portions recessed radially inward from both circumferential ends 151b, 151c, 153b, and 153c. For this reason, as a result of the wiring board 3 abutting against the ends 151b, 151c, 153b, and 153c and being positioned radially, the wiring board 3 faces portions 151a and 153a corresponding to the roots of the first terminal 152 and the second terminal 154 with a gap G shown in FIG. 3 therebetween. Therefore, since the wiring board 3 does not contact the coil wire wound around the root portions of the first terminal 152 and the second terminal 154, disconnection of the coil wire is less likely to occur.

[0034] (Configuration of Holder 7) FIG. 7 is a perspective view of the holder 7 and the like shown in FIG. 6 as viewed from the reverse output side L2. As shown in FIGS. 3, 6, and 7, the holder 7 has a gearbox support portion 71 that overlaps the output side L1 on the first end plate 12 that constitutes the end of the output side L1 of the motor 10, and a board support portion 76 that extends from the gearbox support portion 71 to the outer peripheral side of the motor 10. Accordingly, the gear housing 20 is provided with a notch 29 for passing through a portion where the board support portion 76 extends from the gearbox support portion 71. Here, the gearbox support portion 71 holds the gearbox 2 from the reverse output side L2, and the board support portion 76 holds the wiring board 3 from the radially inner side. Therefore, the gearbox 2 and the wiring board 3 can be held by the holder 7 having a simple configuration. The gearbox support portion 71 is in the shape of a disk substantially the same size as the first end plate 12, and the gearbox support portion 71 is a plate-like portion that extends from the radially outer end of the gearbox support portion 71 to the reverse output side L2. In this embodiment, the holder 7 is made of resin. More specifically, the holder 7 is made of a reinforced resin containing glass fibers.

[0035] In this embodiment, the holder 7 is fixed to the motor 10. More specifically, as shown in FIG. 7, the motor 10 includes a first engaging portion 16 that engages with the gearbox support portion 71 and holds the gearbox support portion 71. In this embodiment, the gearbox support portion 71 is the mo It is provided with a plurality of first engaging convex portions 72 protruding toward the side of the motor 10, and the first engaging portion 16 includes a plurality of first engaging holes 160 into which the plurality of first engaging convex portions 72 enter and engage from the output side L1. In this embodiment, since the holder 7 overlaps the output side L1 on the first end plate 12 that constitutes the end portion of the output side L1 of the motor 10, the first engaging portion 16 composed of the plurality of first engaging holes 160 is provided on the first end plate 12.

[0036] Therefore, when the first engaging convex portion 72 is made to enter the first engaging hole 160 from the output side L1, the claw portion 721 bent radially outward at the tip of the first engaging convex portion 72 abuts against the surface of the first end plate 12 on the side opposite to the output side L2, and the holder 7 is fixed to the first end plate 12. Thus, in this embodiment, by the engagement between the first engaging convex portion 72 and the first engaging hole 160 when the gearbox support portion 71 of the holder 7 is pressed against the motor 10 side, the gearbox support portion 71 can be fixed to the motor 10. Therefore, it is not necessary to provide tapped holes or screws, so that the number of parts and the manufacturing man-hours can be reduced. Further, since the holder 7 is made of resin, for the first engaging convex portion 72, a structure suitable for engagement with the first engaging hole 160 formed in the first end plate 12 of the motor 10 can be easily realized. Furthermore, in this embodiment, as shown in FIG. 6, at the opening edge of the output side L1 of the first engaging hole 160, both the portion 160a located radially inward and the portion 160b located radially outward are chamfered obliquely. Therefore, the insertion of the first engaging convex portion 72 into the first engaging hole 160 is easy, and breakage or chipping of the first engaging convex portion 72 can be prevented.

[0037] Also, as shown in FIG. 4, the gearbox support portion 71 includes a second engaging portion 73 that engages with the gear housing 20 and holds the gear housing 20. In this embodiment, the gear housing 20 is provided with a plurality of second engaging holes 26 that are spaced apart in the circumferential direction, and the second engaging portion 73 includes a plurality of second engaging protrusions 731 that enter and engage with the plurality of second engaging holes 26 from the radially inner side. Thus, in this embodiment, when the gear housing 20 is pressed against the gearbox support portion 71, the second engaging protrusions 731 engage with the second engaging holes 26, so that the gear housing 20 can be fixed to the gearbox support portion 71. Therefore, it is not necessary to provide screws or the like, and the number of parts and the manufacturing man-hours can be reduced. Further, since the holder 7 is made of resin, for the second engaging protrusions 731, a structure suitable for engagement with the second engaging holes 26 formed in the gear housing 20 can be easily realized.

[0038] As shown in FIG. 6, the substrate support portion 76 is plate-shaped and overlaps the outer peripheral surface of the motor case 41 from the radially outer side. An opening 760 is formed in the radially outer end of the first terminal block 151, the two first terminals 152, the radially outer end of the second terminal block 153, and the two second terminals 154 so as to project radially outward from the notch 410. Accordingly, the wiring substrate 3 is connected to the first terminal 152 and the second terminal 154 in a state of overlapping the substrate support portion 76 from the radially outer side. Here, the wiring substrate 3 may be either a rigid substrate or a flexible wiring substrate, but in this embodiment, the wiring substrate 3 is a rigid substrate.

[0039] In the substrate support portion 76, the region overlapping the wiring substrate 3 is a recess 77 that is recessed toward the radially inner side. When the wiring substrate 3 is disposed in the recess 77 from the radially outer side so that the first terminal 152 and the second terminal 154 fit into the four through holes 36, the wiring substrate 3 overlaps the recess 77. In this state, a part of the wiring substrate 3 protrudes radially outward from the recess 77, but the recess 77 can reduce the dimension in which the wiring substrate 3 protrudes radially outward from the recess 77.

[0040] Here, in the recess 77, a first side wall 771 exists on one circumferential side CW, and a second side wall 772 exists on the output side L1. Therefore, when the wiring board 3 is disposed in the recess 77, a first end portion 31 on one circumferential side CW of the wiring board 3 abuts against the first side wall 771 of the recess 77, and a second end portion 32 on the output side L1 of the wiring board 3 abuts against the second side wall 772 of the recess 77. Therefore, the wiring board 3 can be securely fixed to the holder 7.

[0041] On the other hand, since there are no side walls on the other circumferential side CCW and the anti-output side L2 of the recess 77, when the wiring board 3 is overlaid on the recess 77, a third end portion 33 on the other circumferential side CCW of the wiring board 3 and a fourth end portion 34 on the anti-output side L2 protrude from the substrate support portion 76. Here, an electrode 30 shown in FIG. 8 is formed on the third end portion 33. Therefore, a power supply member 19 composed of a connector 190 (see FIG. 1) is connected to the third end portion 33 of the wiring board 3.

[0042] The wiring board 3 is provided with a plurality of third engagement holes 38 penetrating the wiring board 3, and the substrate support portion 76 is provided with a plurality of third engagement protrusions 78 respectively fitting into the plurality of third engagement holes 38. Therefore, when the wiring board 3 is disposed such that the third engagement protrusions 78 fit into the third engagement holes 38, as shown by a solid line La in FIG. 2, a portion of the third engagement protrusion 78 protruding from the third engagement hole 38 is deformed by heat welding so as to overlap the wiring board 3 from the radially outer side as shown by a one-dot chain line Lb in FIG. 2, whereby the wiring board 3 is held by the holder 7. In the present embodiment, the plurality of third engagement protrusions 78 are composed of a first protrusion 781 on one circumferential side CW and a second protrusion 782 on the other circumferential side CCW, and the plurality of third engagement holes 38 are composed of a first hole 381 into which the first protrusion 781 fits and a second hole 382 into which the second protrusion 782 fits. The first hole 381 is a slit extending in a groove shape up to the first end portion 31 of the wiring board 3, and a rib-shaped protrusion 780 connecting the first protrusion 781 and the first side wall 771 is formed on the bottom wall 770 of the recess 77.

[0043] (Configuration of the washer 8) As shown in FIGS. 3 and 4, an annular washer 8 is disposed between the gear box 2 and the gear box support portion 71. More specifically, an annular washer 8 is disposed between the planetary gear 212 used in the first-stage planetary gear mechanism 21 of the gear box 2 and the gear box support portion 71. Therefore, since the planetary gear 212 does not directly contact the gear box support portion 71, sliding loss can be reduced. In particular, in this embodiment, when molding the holder 6 by resin, a hole 710 (see FIG. 6) for disposing a mold for providing the first engaging convex portion 72 on the gear box support portion 71 is provided. Therefore, although the planetary gear 212 may be caught on the edge of the hole 710, the washer 8 makes it difficult for the situation where the planetary gear 212 is caught on the edge of the hole 710 to occur. Further, the washer 8 has substantially the same outer dimensions as the gear box support portion 71. For this reason, the situation where the end portion of the washer 8 is caught on the planetary gear 212 does not occur. The washer 8 is made of metal. For example, the washer 8 is a sliding washer made of a steel material such as stainless steel.

[0044] Here, the end portion 27 on the reverse output side L2 side of the gear housing 20 has a larger inner diameter than the portion where the internal gear 201 is formed. For this reason, the end portion 27 of the gear box 2 includes an annular wall portion 271 that surrounds the gear box support portion 71 from the radially outer side, and an annular step portion 272 facing the reverse output side L2 side. Further, the outer diameter of the washer 8 is larger than the inner diameter of the portion where the internal gear 201 is formed. For this reason, the outer peripheral end portion 81 of the washer 8 is held between the gear box support portion 71 and the step portion 272 of the gear housing 20. Therefore, when the planetary gear 212 of the gear box 2 rotates in contact with the washer 8, displacement of the washer 8 is less likely to occur. Further, since displacement or the like of the washer 8 does not occur, deformation or the like of the washer 8 is also less likely to occur. Furthermore, heat generated by the motor 10 can be suppressed from being transmitted to the gear box 2.

[0045] (Assembly Process) FIG. 8 is an explanatory view showing the assembly process of the geared motor 1 shown in FIG. 1. In the assembly process of the geared motor 1, as shown in FIGS. 3 and 8, after the planetary gear mechanisms 21, 22, and 23 are incorporated inside the gear housing 20 to complete the gear box 2, the washer 8 is arranged. On the other hand, on the side of the motor 10, the holder 7, the wiring board 3, etc. are assembled. Next Then, the side of the gear box 2 and the side of the motor 10 are overlapped in the direction of the rotation center axis L. As a result, since the plurality of second engaging convex portions 731 respectively enter and engage with the plurality of second engaging holes 26 from the radially inner side, the side of the gear box 2 and the side of the motor 10 are coupled. As a result, the geared motor 1 is completed. Regarding the wiring board 3, it may be fixed to the holder 7 at any timing before or after the above assembly.

[0046] In this embodiment, when performing the process shown in FIG. 8, since the holder 7 fixed to the motor 10 and the gear box 2 can be coupled in a state where the outer peripheral end portion 81 of the washer 8 is overlapped with the stepped portion 272 of the gear housing 20, the assembly is easy. Further, after the assembly is completed, as shown in FIG. 2, the second engaging convex portion 731 of the holder 7 is engaged with the second engaging hole 26 of the gear housing 20, but even in this state, the outer peripheral end portion 81 of the washer 8 can be visually recognized from the second engaging hole 26. Therefore, even at the stage where the geared motor 1 is assembled, the presence or absence of the washer 8 can be confirmed.

[0047] (Other Embodiments) In the above embodiment, the wiring board 3 is a rigid board, but the present invention may be applied when the wiring board 3 is a flexible wiring board. Even in this case, since the wiring board 3 is protected by the holder 7, it is possible to omit pasting a reinforcing plate or the like on the flexible wiring board.

[0048] In the above embodiment, the first engaging portion 16 of the motor 10 is the first engaging hole 160 that engages with the first engaging convex portion 72 of the gear box support portion 71, but the first engaging portion 16 of the motor 10 may be an engaging convex portion that engages with the engaging hole of the gear box support portion 71.

[0049] In the above embodiment, the second engaging portion 73 of the gearbox support portion 71 is the second engaging convex portion 731 that engages with the second engaging hole 26 of the gear housing 20. However, the second engaging portion 73 of the gearbox support portion 71 may be an engaging hole with which the engaging convex portion of the gear housing 20 engages.

Description of Reference Numerals

[0050] 1…Geared motor, 2…Gearbox, 3…Wiring board, 4, 4A, 4B…Stator, 5…Rotor, 7…Holder, 8…Washer, 10…Motor, 11…First end portion, 12…First end plate…Second end portion, 14…Second end plate, 16…First engaging portion, 19…Power supply member, 20…Gear housing, 21, 22, 23…Planetary gear mechanism, 25…Output member, 26…Second engaging hole, 41…Motor case, 42A…First coil bobbin, 42B…Second coil bobbin, 43A, 43B…Inner stator core, 44A, 44B…Outer stator core, 45…Pole teeth, 46A…First coil, 46B…Second coil, 50…Rotating shaft, 59…Permanent magnet, 61…First bearing, 62…Second bearing, 71…Gearbox support portion, 72…First engaging convex portion, 73…Second engaging portion, 76…Substrate support portion, 77…Recess, 78…Third engaging convex portion, 151…First terminal block, 152…First terminal, 153…Second terminal block, 154…Second terminal, 160…First engaging hole, 190…Connector, 201…Internal gear, 212, 222, 232…Planetary gears, 271…Wall portion, 272…Step portion, 381…First hole, 382…Second hole, 731…Second engaging convex portion, 760…Opening, 771…First side wall, 772…Second side wall, 781…First convex portion, 782…Second convex portion, G…Gap, L…Axis of rotation center, L1…Output side, L2…Reverse output side, CW…One side, CCW…The other side

Claims

1. A motor, a gearbox disposed on the output side of the motor with respect to the rotation center axis, a wiring board disposed on the outer peripheral side of the motor, a holder fixed to the motor and holding the gearbox and the wiring board, characterized by comprising the above components. A geared motor.

2. In the geared motor according to Claim 1, the holder has a gearbox support portion overlapping the end portion on the output side of the motor, and a substrate support portion extending from the gearbox support portion to the outer peripheral side of the motor and supporting the wiring board from the inner side in the radial direction. A geared motor characterized by this.

3. In the geared motor according to Claim 2, the motor is provided with a first engaging portion that engages with the gearbox support portion and holds the gearbox support portion. A geared motor characterized by this.

4. In the geared motor according to Claim 3, the gearbox support portion is provided with a plurality of first engaging convex portions protruding toward the motor side, the first engaging portion includes a plurality of first engaging holes into which the plurality of first engaging convex portions enter and engage from the output side. A geared motor characterized by this.

5. In the geared motor according to Claim 4, the motor is provided with an end plate for holding a bearing at the end portion on the output side, and the plurality of first engaging holes are provided in the end plate. A geared motor characterized by this.

6. In the geared motor according to any one of Claims 2 to 5, the gearbox includes a plurality of gears and a gear housing that houses the plurality of gears inside, the gearbox support portion is provided with a second engaging portion that engages with the gear housing and holds the gear housing. A geared motor characterized by this.

7. In the geared motor according to Claim 6, a plurality of second engaging holes penetrating in the radial direction are provided in the gear housing, the second engaging portion includes a plurality of second engaging convex portions that enter and engage with the plurality of second engaging holes from the inner side in the radial direction. A geared motor characterized by this.

8. In the geared motor according to Claim 6 or 7, a washer is disposed between the gearbox and the gearbox support portion, and the outer peripheral end portion of the washer is sandwiched between the gear housing and the gearbox support portion. A geared motor characterized by this.

9. In the geared motor according to any one of claims 6 to 8, the plurality of gears include planetary gears that mesh with internal teeth formed on the inner peripheral surface of the gear housing, and the geared motor is characterized by this.

10. In the geared motor according to any one of claims 2 to 9, the motor includes a terminal block and a plurality of pin-shaped terminals that project radially outward from the terminal block, the substrate support portion is provided with an opening for projecting the plurality of terminals radially outward, and the wiring board is provided with a plurality of through holes into which the plurality of terminals fit, and the geared motor is characterized by this.

11. In the geared motor according to claim 10, the holder is made of resin, the wiring board is provided with a third engagement hole that penetrates the wiring board, the substrate support portion is provided with a third engagement convex portion that fits into the third engagement hole, and a portion of the third engagement convex portion that projects from the third engagement hole is deformed so as to overlap the wiring board from the radially outer side, and the geared motor is characterized by this.

12. In the geared motor according to claim 10 or 11, in the holder, a region that overlaps the wiring board is a recess that is recessed radially inward, and an end portion of the wiring board abuts against a side wall of the recess, and the geared motor is characterized by this.

13. In the geared motor according to any one of claims 10 to 12, the wiring board faces radially outside with a gap with respect to a portion corresponding to the base of the terminals in the terminal block, and the geared motor is characterized by this.

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