Geared motor

Abstract

To provide a geared motor which can reduce the number of components and manufacturing man-hours.SOLUTION: A geared motor 1 includes a motor 10, a gear box 2 having a gear housing 20 storing a plurality of gears therein, and a resin holder 7. In the holder 7, a gear box support part 71 overlaps an end on an output side L1 of the motor 10, and supports the gear box 2. The gear box support part 71 and a first end 12 of the motor 10 are fixed to each other by engagement of a first engagement projection part 72 of the gear box support part 71 with a first engagement hole 160 provided on a first end plate 12 of the motor 10 as a first engagement part 16. The gear housing 20 and the gear box support part 71 are fixed to each other by engagement. The geared motor 1 has a wiring board 3 on an outer peripheral side of the motor 10, and the holder 7 has a substrate support part 76 for supporting the wiring board 3 from the inside in a radial direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a geared motor in which a gear box is integrally provided with a motor. [Background technology]

[0002] In a geared motor in which a gear box is integrally provided with a motor, a holder that supports the gear box is fixed to the motor by screws between the motor and the gear box (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-149013 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a structure in which a holder is fixed to a motor with screws, such as the geared motor described in Patent Document 1, tapped holes and screws must be provided, which poses the problem of a large number of parts and manufacturing steps.

[0005] In view of the above problems, an object of the present invention is to provide a geared motor that can reduce the number of parts and the number of manufacturing steps. [Means for solving the problem]

[0006] In order to solve the above problems, in the present invention, the geared motor has a motor, a holder having a gearbox support part that overlaps with an output side end part in the direction of the rotational center axis of the motor, and a gearbox supported by the gearbox support part on the output side of the gearbox support part, wherein the holder is made of resin, and the motor has a first engagement part that engages with the gearbox support part to hold the gearbox support part.

[0007] In the geared motor according to the present invention, the motor includes a first engagement portion that engages with the gearbox support portion to hold the gearbox support portion, and the engagement allows the gearbox support portion to be fixed to the motor. This eliminates the need for tapped holes or screws, and reduces the number of parts and manufacturing steps. In addition, the holder is made of resin, and therefore a structure suitable for engagement with the motor can be easily realized.

[0008] In the present invention, an aspect can be adopted in which the gearbox support portion has a first engagement protrusion protruding toward the motor, and the first engagement portion includes a first engagement hole into which the first engagement protrusion enters from the output side and engages. According to this aspect, the holder can be fixed to the motor by pressing the gearbox support portion against the motor.

[0009] In the present invention, the motor may have an end plate at the end on the output side that holds a bearing, and the first engagement hole may be provided in the end plate.

[0010] In the present invention, the gear box may include a plurality of gears and a gear housing that houses the plurality of gears therein, and the gear box support may include a second engagement portion that engages with the gear housing to hold the gear housing. According to this aspect, the gear housing can be fixed to the gear box support by the engagement. Therefore, since there is no need to use screws or the like when fixing the gear housing to the gear box support, the number of parts and manufacturing steps can be reduced. Also, since the holder is made of resin, a structure suitable for engagement with the gear housing can be easily realized.

[0011] In the present invention, a mode can be adopted in which the gear housing is provided with a second engagement hole penetrating in the radial direction, and the second engagement portion includes a second engagement protrusion that enters and engages with the second engagement hole from the radially inner side. According to this mode, when the gear housing is pressed against the gear box support portion, the second engagement protrusion engages with the second engagement hole, so that the gear housing can be fixed to the gear box support portion.

[0012] In the present invention, a washer may be disposed between the gear box and the gear box support, and a radially outer end of the washer may be sandwiched between the gear housing and the gear box support. According to this aspect, it is possible to improve the sliding properties of the gear used in the gear box. Also, the washer can be fixed by joining the gear box and a holder fixed to the motor.

[0013] In the present invention, a mode can be adopted in which the plurality of gears includes a planetary gear that meshes with an internal gear formed on the inner circumferential surface of the gear housing.

[0014] In the present invention, an aspect can be adopted in which the motor has a wiring board arranged on the outer periphery, and the holder has a board support part that extends from the gearbox support part to the outer periphery of the motor and supports the wiring board from the inside in the radial direction. According to this aspect, the gearbox can be held on the output side of the motor by using a holder for fixing the wiring board to the outer periphery of the motor, so that a geared motor in which a wiring board is fixed to the outer periphery of the motor via a holder can be provided without a significant increase in assembly man-hours or the addition of new parts. Therefore, a geared motor in which a wiring board is fixed to the outer periphery of the motor via a holder can be provided at low cost. Effect of the Invention

[0015] In the geared motor according to the present invention, the motor includes a first engagement portion that engages with the gearbox support portion to hold the gearbox support portion, and the engagement allows the gearbox support portion to be fixed to the motor. This eliminates the need for tapped holes or screws, and reduces the number of parts and manufacturing steps. In addition, the holder is made of resin, and therefore a structure suitable for engagement with the motor can be easily realized. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a perspective view of a geared motor to which the present invention is applied. [Diagram 2] FIG. 2 is a side view of the geared motor shown in FIG. [Diagram 3] FIG. 2 is a cross-sectional view of the geared motor shown in FIG. [Figure 4] 2 is an exploded perspective view showing a state in which a gear housing is removed from the geared motor shown in FIG. 1. [Diagram 5] FIG. 5 is an exploded perspective view showing the gears and the like shown in FIG. 4. [Figure 6] 5 is an exploded perspective view showing a state in which a wiring board and the like are removed from the motor shown in FIG. 4. [Figure 7] 7 is a perspective view of the holder and the like shown in FIG. 6, as viewed from the opposite output side. [Figure 8] 2A to 2C are explanatory diagrams showing an assembly process of the geared motor shown in FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] An example of a geared motor 1 to which the present invention is applied will be described with reference to the drawings. In the following description, the side on which the gear box 2 is provided is the output side L1, and the side on which the gear box 2 is provided is the output side L2. The side opposite to the output side is the anti-output side L2. In describing the wiring board 3, etc., one side around the rotation center axis L is labeled CW, and the other side is labeled CCW.

[0018] (Overall configuration of geared motor 1) Fig. 1 is a perspective view of a 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 taken along the central axis of rotation L. Fig. 4 is an exploded perspective view showing the geared motor 1 shown in Fig. 1 with the gear housing 20 removed.

[0019] As shown in Figs. 1, 2, 3 and 4, the geared motor 1 of this embodiment includes a motor 10, a gear box 2 arranged on the output side L1 in the direction of the rotation axis L with respect to the motor 10, a wiring board 3 arranged on the outer periphery of the motor 10, and a holder 7 fixed to the motor 10, and 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 to the outer periphery of the motor 10. Therefore, it is possible to provide a geared motor 1 in which the wiring board 3 is fixed to the outer periphery of the motor 10 via the holder 7 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 1 in which the wiring board 3 is fixed to the outer periphery of the motor 10 via the holder 7 at low cost.

[0020] The motor 10 has a cylindrical stator 4, a first metal end plate 12 fixed to a first end 11 on the output side L1 of the stator 4 by welding or the like, and a second metal end plate 14 fixed to a second end 13 on the counter output side L2 of the stator 4 by welding or the like. Thus, the motor 10 has the first end plate 12 and the second end plate 14 on both sides in the direction of the central axis L of rotation. In the motor 10, a power supply unit 15 including a wiring board 3 and the like is provided on the radial outside of the stator 4 constituting the motor body. In the power supply unit 15, an external power supply member 19 is connected to an end of the wiring board 3 on the other circumferential side CCW. In this embodiment, the power supply member 19 is a connector 190.

[0021] (Configuration of motor 10) As shown in FIG. 3, the motor 10 is a stepping motor, and 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 counter output side L2 are arranged to overlap in the direction of the rotation center axis L. Therefore, 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 to overlap 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, the annular inner stator core 43A and the annular outer stator core 44A are arranged to overlap. On both sides of the second coil bobbin 42B in the direction of the rotation center axis L, the annular inner stator core 43B and the annular outer stator core 44B are arranged to overlap. 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 in the circumferential direction. In this embodiment, the outer peripheral 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 11 of the output side L1 of the stator 4 is made up of the annular portion 47 of the outer stator core 44A. The second end 13 of the counter-output side L2 of the stator 4 is made up of the annular portion 48 of the outer stator core 44B.

[0022] The rotor 5 is disposed coaxially on the radially inner side of the stator 4. In the rotor 5, a rotating shaft 50 extends along a central axis of rotation 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 to the rotating shaft 50 at a position closer to the counter output side L2 with an adhesive or the like. The permanent magnet 59 is disposed inside the stator 4, with its outer peripheral surface inclined radially. The pole teeth 45 of the stator 4 face each other on the inside with a predetermined gap therebetween.

[0023] 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 counter-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. A circular washer 67, through which the rotating shaft 50 passes, is disposed between the second bearing 62 and the permanent magnet 59.

[0024] (Gearbox 2 configuration) 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 an output member 25 protrudes from the gear housing 20 to the output side L1. In this embodiment, the plurality of gears includes a planetary gear that meshes with an internal gear 201 formed on the inner circumferential surface of the gear housing 20, and inside the gear housing 20, three-stage planetary gear mechanisms 21, 22, and 23 are configured along the central axis L of rotation. Therefore, the rotation of the motor 10 is decelerated and transmitted to the output member 25.

[0025] 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 planet carrier 211, a total of three planetary gears 212 rotatably held by the planet carrier 211, and an internal gear 201 provided on the inner circumferential surface of the gear housing 20. The second stage planetary gear mechanism 22 is composed of a sun gear 220 provided on the planet carrier 211 of the previous stage planetary gear mechanism 21, a planet carrier 221, a total of three planetary gears 222 rotatably held by the planet carrier 221, and the internal gear 201 provided on the inner circumferential surface of the gear housing 20. The third stage planetary gear mechanism 23 is made up of a sun gear 230 provided on the planet carrier 221 of the previous stage planetary gear mechanism 22, a planet carrier 231, a total of three planetary gears 232 rotatably held by the planet carrier 231, and an internal gear 201 provided on the inner circumferential surface of the gear housing 20. Here, the planet carrier 231 is configured as a part of the output member 25.

[0026] (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 FIG. 3 and FIG. 6, the motor case 41 is provided with a notch 410 in which a part in the circumferential direction is cut out. In the first coil bobbin 42A, a first terminal block 151 is provided at an end portion on the radial outer side of the flange portion 420A on the counter output side L2 at an angular position corresponding to the notch 410. The first terminal block 151 holds two pin-shaped first terminals 152 at positions spaced apart in the circumferential direction. The radial outer end portion of the first terminal block 151 and the two first terminals 152 protrude radially outward from the notch 410. In the second coil bobbin 42B, a second terminal block 153 is provided at an end portion on the radial outer side of the flange portion 420B on the counter output side L2 at an angular position corresponding to the notch 410. The second terminal block 153 holds two pin-shaped second terminals 154 at positions spaced apart in the circumferential direction. At the first terminal 152 and the second terminal 154, the ends of the first coil 46A and the second coil 46B are intertwined and then fixed by soldering.

[0027] 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 protrude radially outward from the notch 410, and the first terminals 152 and the second terminals 154 are connected to the wiring board 3 disposed to face the radially outer end faces of the first terminal block 151 and the second terminal block 153. More specifically, a total of 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. 52 and the second terminal 154 are connected by solder (not shown).

[0028] On the radially outer surface of the first terminal block 151 and the radially outer surface of the second terminal block 153, the portions 151a and 153a corresponding to the bases of the first terminal 152 and the second terminal 154 are recessed radially inward from the ends 151b, 151c, 153b, and 153c on both sides in the circumferential direction. Therefore, the wiring board 3 is abutted against the ends 151b, 151c, 153b, and 153c to perform radial positioning, and as a result, the wiring board 3 faces the portions 151a and 153a corresponding to the bases of the first terminal 152 and the second terminal 154 via the gap G shown in FIG. 3. Therefore, the wiring board 3 does not come into contact with the coil wire wound around the base portions of the first terminal 152 and the second terminal 154, and therefore breakage of the coil wire is unlikely to occur.

[0029] (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 opposite output side L2. As shown in FIGS. 3, 6, and 7, the holder 7 has a gearbox support portion 71 that overlaps the first end plate 12 constituting the end of the output side L1 of the motor 10 from the output side L1, and a board support portion 76 that extends from the gearbox support portion 71 to the outer circumferential side of the motor 10. Therefore, the gear housing 20 is provided with a notch 29 for passing the portion of the board support portion 76 extending from the gearbox support portion 71. Here, the gearbox support portion 71 holds the gearbox 2 from the opposite output side L2, and the board support portion 76 holds the wiring board 3 from the inside in the radial direction. Therefore, the gearbox 2 and the wiring board 3 can be held by the holder 7 with a simple configuration. The gearbox support part 71 is a disk shape of approximately the same size as the first end plate 12, and is a plate-like portion extending from a radially outer end of the gearbox support part 71 to the non-output side L2. In this embodiment, the holder 7 is made of resin. More specifically, the holder 7 is made of reinforced resin containing glass fiber.

[0030] 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 engagement portion 16 that engages with the gearbox support portion 71 to hold the gearbox support portion 71. In this embodiment, the gearbox support portion 71 includes a plurality of first engagement protrusions 72 protruding toward the motor 10, and the first engagement portion 16 includes a plurality of first engagement holes 160 into which the plurality of first engagement protrusions 72 enter from the output side L1 and engage. In this embodiment, the holder 7 overlaps the first end plate 12 that constitutes the end portion of the output side L1 of the motor 10 from the output side L1, and therefore the first engagement portion 16 consisting of the plurality of first engagement holes 160 is provided in the first end plate 12.

[0031] Therefore, when the first engagement protrusion 72 is inserted into the first engagement hole 160 from the output side L1, the claw portion 721 bent radially outward at the tip of the first engagement protrusion 72 abuts against the surface of the first end plate 12 on the non-output side L2, and the holder 7 is fixed to the first end plate 12. In this manner, in this embodiment, the gear box support portion 71 of the holder 7 can be fixed to the motor 10 by the engagement between the first engagement protrusion 72 and the first engagement hole 160 when the gear box support portion 71 of the holder 7 is pressed against the motor 10. Therefore, it is not necessary to provide tapped holes or screws, and it is possible to reduce the number of parts and the manufacturing process. In addition, since the holder 7 is made of resin, the first engagement protrusion 72 can easily be structured to be suitable for engagement with the first engagement hole 160 formed in the first end plate 12 of the motor 10. 6, in this embodiment, both the portion 160a located on the radially inner side and the portion 160b located on the radially outer side of the opening edge of the output side L1 of the first engagement hole 160 are beveled at an angle. This makes it easy to insert the first engagement protrusion 72 into the first engagement hole 160, and prevents the first engagement protrusion 72 from being damaged or chipped.

[0032] As shown in FIG. 4, the gear box support portion 71 includes a second engagement portion 73 that engages with the gear housing 20 to hold the gear housing 20. The gear box 20 has a plurality of second engagement holes 26 spaced apart from each other in the circumferential direction, and the second engagement portion 73 is made of a plurality of second engagement protrusions 731 that enter and engage with the plurality of second engagement holes 26 from the radially inner side. In this manner, in this embodiment, when the gear housing 20 is pressed against the gear box support portion 71, the second engagement protrusions 731 engage with the second engagement holes 26, so that the gear housing 20 can be fixed to the gear box support portion 71. Therefore, since there is no need to provide screws or the like, the number of parts and the number of manufacturing steps can be reduced. In addition, since the holder 7 is made of resin, the second engagement protrusions 731 can be easily structured to be suitable for engagement with the second engagement holes 26 formed in the gear housing 20.

[0033] 6, the board support portion 76 is a plate-like member overlapping the outer peripheral surface of the motor case 41 from the radially outer side, and has an opening 760 that allows 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 to protrude radially outward from the notch 410. Therefore, the wiring board 3 is connected to the first terminal 152 and the second terminal 154 in a state where it overlaps the board support portion 76 from the radially outer side. Here, the wiring board 3 may be either a rigid board or a flexible wiring board, but in this embodiment, the wiring board 3 is a rigid board.

[0034] In the board support portion 76, the region overlapping with the wiring board 3 forms a recess 77 recessed radially inward, and when the wiring board 3 is placed in the recess 77 from the radial outside so that the first terminals 152 and the second terminals 154 fit into the four through holes 36, the wiring board 3 overlaps the recess 77. In this state, a portion of the wiring board 3 protrudes radially outward from the recess 77, but the recess 77 can reduce the dimension by which the wiring board 3 protrudes radially outward from the recess 77.

[0035] Here, the recess 77 has a first side wall 771 on one circumferential side CW and a second side wall 772 on the output side L1. Therefore, when the wiring board 3 is placed in the recess 77, the first end 31 on the one circumferential side CW of the wiring board 3 abuts against the first side wall 771 of the recess 77, and the second end 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 reliably fixed to the holder 7.

[0036] In contrast, the recess 77 has no side walls on the other circumferential side CCW and the anti-output side L2, so that when the wiring board 3 is placed over the recess 77, the third end 33 on the other circumferential side CCW of the wiring board 3 and the fourth end 34 on the anti-output side L2 protrude from the board support part 76. Here, the third end 33 has an electrode 30 as shown in Fig. 8 formed thereon. Therefore, a power supply member 19 consisting of a connector 190 (see Fig. 1) is connected to the third end 33 of the wiring board 3.

[0037] The wiring board 3 is provided with a plurality of third engagement holes 38 penetrating the wiring board 3, and the board support portion 76 is provided with a plurality of third engagement protrusions 78 that fit into the plurality of third engagement holes 38, respectively. Therefore, when the wiring board 3 is arranged so that the third engagement protrusions 78 fit into the third engagement holes 38, as shown by the solid line La in FIG. 2, the portion of the third engagement protrusion 78 protruding from the third engagement hole 38 is deformed by thermal welding so as to overlap the wiring board 3 from the radial outside as shown by the dashed line Lb in FIG. 2, whereby the wiring board 3 is held by the holder 7. In this embodiment, the plurality of third engagement protrusions 78 are composed of a first protrusion 781 on one side CW in the circumferential direction and a second protrusion 782 on the other side CCW in the circumferential direction, 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-like manner to the first end 31 of the wiring board 3, and a rib-shaped protrusion 780 is formed on the bottom wall 770 of the recess 77, connecting the first protrusion 781 and the first side wall 771.

[0038] (Washer 8 Configuration) As shown in FIG. 3 and FIG. 4, a circular groove is formed between the gear box 2 and the gear box support portion 71. An annular washer 8 is disposed. More specifically, an annular washer 8 is disposed between the planetary gear 212 used in the first stage planetary gear mechanism 21 of the gearbox 2 and the gearbox support portion 71. Therefore, the planetary gear 212 does not directly contact the gearbox support portion 71, so that sliding loss can be reduced. In particular, in this embodiment, when the holder 6 is resin-molded, the gearbox support portion 71 is provided with a hole 710 (see FIG. 6) for arranging a die for providing the first engaging protrusion 72. Therefore, the planetary gear 212 may get caught on the edge of the hole 710. However, the washer 8 makes it difficult for the planetary gear 212 to get caught on the edge of the hole 710. In addition, the washer 8 has approximately the same outer dimensions as the gearbox support portion 71. Therefore, the end of the washer 8 does not get caught on the planetary gear 212. 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.

[0039] Here, the end 27 of the gear housing 20 on the counter output side L2 side has a larger inner diameter than the portion where the internal gear 201 is formed. Therefore, the end 27 of the gear box 2 has an annular wall portion 271 surrounding the gear box support portion 71 from the radial outside and an annular step portion 272 facing the counter output side L2 side. In addition, the outer diameter of the washer 8 is larger than the inner diameter of the portion where the internal gear 201 is formed. Therefore, the end 81 on the outer periphery side of the washer 8 is held between the gear box support portion 71 and the gear housing 20 step portion 272. Therefore, when the planetary gear 212 of the gear box 2 rotates in contact with the washer 8, the washer 8 is unlikely to be displaced. In addition, since the washer 8 is not likely to be displaced, the washer 8 is unlikely to be deformed. Furthermore, the heat generated by the motor 10 can be prevented from being transmitted to the gear box 2.

[0040] (Assembly process) FIG. 8 is an explanatory diagram 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 FIG. 3 and FIG. 8, the planetary gear mechanisms 21, 22, and 23 are assembled inside the gear housing 20 to complete the gear box 2, and then the washer 8 is arranged. On the other hand, the holder 7 and the wiring board 3 are assembled on the motor 10 side. Next, the gear box 2 side and the motor 10 side are overlapped in the direction of the rotation center axis L. As a result, the multiple second engagement protrusions 731 enter and engage with the multiple second engagement holes 26 from the radial inside, respectively, and the gear box 2 side and the motor 10 side are joined together. As a result, the geared motor 1 is completed. The wiring board 3 may be fixed to the holder 7 at any timing before or after the above assembly.

[0041] In this embodiment, when performing the step shown in Fig. 8, the holder 7 fixed to the motor 10 can be joined to the gear box 2 with the radially outer end 81 of the washer 8 overlapping the step 272 of the gear housing 20, making assembly easy. After assembly is complete, the second engaging protrusion 731 of the holder 7 engages with the second engaging hole 26 of the gear housing 20 as shown in Fig. 2, but even in this state, the outer peripheral end 81 of the washer 8 can be seen from the second engaging hole 26. Therefore, even when assembly of the geared motor 1 is complete, it is possible to check whether the washer 8 is present or not.

[0042] (Other embodiments) In the above embodiment, the wiring board 3 is a rigid board, but the present invention may be applied to a case where the wiring board 3 is a flexible wiring board. Even in this case, the wiring board 3 is protected by the holder 7, so that it is possible to omit attaching a reinforcing plate or the like to the flexible wiring board.

[0043] In the above embodiment, the first engagement portion 16 of the motor 10 is the first engagement hole 160 that engages with the first engagement protrusion 72 of the gear box support portion 71. Alternatively, it may be an engaging protrusion that engages with an engaging hole of the gear box support portion 71.

[0044] In the above embodiment, the second engagement portion 73 of the gear box support portion 71 was a second engagement protrusion 731 that engages with the second engagement hole 26 of the gear housing 20, but the second engagement portion 73 of the gear box support portion 71 may also be an engagement hole with which the engagement protrusion of the gear housing 20 engages.

[0045] In the above embodiment, the holder 7 is provided with the substrate support portion 76, but the present invention may be applied to a case where the holder 7 is not provided with the substrate support portion 76. For example, the present invention may be applied to a case where the holder 7 is an annular member provided with only the gear box support portion 71. [Explanation of symbols]

[0046] 1 ... geared motor, 2 ... gear box, 3 ... wiring board, 4, 4A, 4B ... stator, 5 ... rotor, 7 ... holder, 8 ... washer, 10 ... motor, 11 ... first end, 12 ... first end plate ... second end, 14 ... second end plate, 16 ... first engagement portion, 19 ... power supply member, 20 ... gear housing, 21, 22, 23 ... planetary gear mechanism, 25 ... output member, 26 ... second engagement 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 protrusion, 73...second engaging portion, 76...board support portion, 77...recess, 78...third engaging protrusion, 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 gear, 271...wall portion, 272...step portion, 381...first hole, 382...second hole, 731...second engaging protrusion, 760...opening, 771...first side wall, 772...second side wall, 781...first protrusion, 782...second protrusion, G...gap, L...rotation center axis, L1...output side, L2...anti-output side, CW...one side, CCW...other side

Claims

1. A motor; a holder including a gearbox support portion that overlaps an end portion of the motor on an output side in a direction of a rotational center axis; a gearbox supported by the gearbox support at the output side of the gearbox support; having The holder is made of resin, The motor includes a first engagement portion that engages with the gearbox support to hold the gearbox support, The gearbox support portion includes a first engagement protrusion protruding toward the motor, the first engagement portion includes a first engagement hole into which the first engagement protrusion enters from the output side and engages, the motor includes an end plate at an output end for holding a bearing; A geared motor, characterized in that the first engagement hole is provided in the end plate.

2. A motor; a holder including a gearbox support portion that overlaps an end portion of the motor on an output side in a direction of a rotational center axis; a gearbox supported by the gearbox support at the output side of the gearbox support; having The holder is made of resin, The motor includes a first engagement portion that engages with the gearbox support to hold the gearbox support, The gear box includes a plurality of gears and a gear housing that houses the plurality of gears therein. The gear box support portion includes a second engagement portion that engages with the gear housing to hold the gear housing, The gear housing is provided with a second engagement hole extending radially therethrough, The second engagement portion includes a second engagement protrusion that enters and engages with the second engagement hole from the inside in the radial direction. A geared motor comprising:

3. 3. The geared motor according to claim 2, A washer is disposed between the gear box and the gear box support, A geared motor, characterized in that a radially outer end of the washer is sandwiched between the gear housing and the gear box support portion.

4. 4. The geared motor according to claim 2, A geared motor, characterized in that the plurality of gears include a planetary gear that meshes with an internal gear formed on the inner circumferential surface of the gear housing.

5. A geared motor according to any one of claims 2 to 4, The gearbox support portion includes a first engagement protrusion protruding toward the motor, The geared motor, wherein the first engagement portion includes a first engagement hole into which the first engagement protrusion enters from the output side and engages.

6. In the geared motor according to claim 5, the motor includes an end plate at an output end for holding a bearing; A geared motor, characterized in that the first engagement hole is provided in the end plate.

7. The geared motor according to any one of claims 1 to 6, a wiring board arranged on the outer periphery of the motor, and the holder having a board support portion extending from the gearbox support portion to the outer periphery of the motor and supporting the wiring board from the radially inner side.

Images