Gear motor

Abstract

A gear motor capable of reducing the number of parts and manufacturing man-hours is provided. A gear box (1) has a motor (10), a gear box (2) including a gear housing (20) that houses a plurality of gears inside, and a resin-made holder (7). In the holder (7), a gear box support portion (71) overlaps with an end portion of an output side (L1) of the motor (10) and supports the gear box (2). The gear box support portion (71) and a first end plate (12) of the motor (10) are fixed by engagement of a first engagement protrusion (72) of the gear box support portion (71) with a first engagement hole (160) provided in the first end plate (12) of the motor (10) as a first engagement portion (16). Also, the gear housing (20) and the gear box support portion (71) are fixed by engagement. The gear motor (1) has a wiring board (3) on an outer peripheral side of the motor (10), and the holder (7) has a board support portion (76) that supports the wiring board (3) from a radially inner side.

Description

Technical Field

[0001] This invention relates to a geared electric motor in which the gearbox and the electric motor are integrated. Background Technology

[0002] In a geared motor in which the gearbox and the motor are integrated, a retaining member that supports the gearbox is fixed by screws between the motor and the gearbox (see Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-149013 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] In the geared motor structure described in Patent Document 1, where the retainer is fixed to the motor by screws, screw holes and screws are required, which results in a large number of parts and a long manufacturing time.

[0008] In view of the above problems, the technical problem of the present invention is to provide a geared electric motor that can reduce the number of parts and manufacturing time.

[0009] Technical solutions adopted to solve technical problems

[0010] To solve the above problems, in this invention, the geared motor is characterized by having: a motor; a retaining member, the retaining member including a gearbox support portion overlapping the output side end in the direction of the rotation center axis of the motor; and a gearbox, the gearbox being supported by the gearbox support portion on the output side of the gearbox support portion, the retaining member being made of resin, and the motor including a first engaging portion that engages with and retains the gearbox support portion.

[0011] In the geared motor of the present invention, the motor includes a first engaging portion that engages with and retains the gearbox support portion, thus enabling the gearbox support portion to be fixed to the motor via engagement. Therefore, screw holes or screws can be omitted, thereby reducing the number of parts and manufacturing time. Furthermore, since the retaining member is made of resin, a structure suitable for engagement with the motor can be easily achieved.

[0012] In this invention, the gearbox support portion has a first engaging protrusion protruding toward the motor side. This first engaging portion includes a first engaging hole through which the first engaging protrusion enters and engages from the output side. According to this method, by pressing the gearbox support portion toward the motor side, the retainer can be fixed to the motor.

[0013] In this invention, the first engaging protrusion can be positioned such that, in the direction of the rotation center axis, it includes: a base region; and a claw region located closer to the motor side than the base region, the claw region being connected to the base region. The first engaging protrusion hooks onto the first engaging portion in the claw region. The first engaging protrusion has: a plurality of bifurcated protrusions, which are spaced apart at least from the midpoint of the base region to the motor side end of the first engaging protrusion in a direction intersecting the rotation center axis. According to this method, the workability of inserting and assembling the first engaging protrusion can be improved while ensuring sufficient strength.

[0014] In this invention, the plurality of bifurcated protrusions of the first engaging protrusion are arranged at intervals in a direction intersecting the rotation center axis direction, covering a range extending throughout the rotation center axis direction of the first engaging protrusion. According to this method, the workability of inserting and assembling the first engaging protrusion can be further improved while ensuring sufficient strength.

[0015] In this invention, the motor can be configured such that the motor has an end plate for retaining a bearing at the output side, and the end plate is provided with the first engagement hole.

[0016] In this invention, the gearbox includes a plurality of gears and a gear housing that houses the plurality of gears internally. The gearbox support includes a second engaging portion that engages with and retains the gear housing. According to this method, the gear housing can be fixed to the gearbox support by engaging. Therefore, when fixing the gear housing to the gearbox support, screws or the like are not required, thereby reducing the number of parts and manufacturing time. Furthermore, since the retaining member is made of resin, a structure suitable for engaging with the gear housing can be easily achieved.

[0017] In this invention, the gear housing is provided with a second engaging hole extending radially through it. The second engaging portion includes a second engaging protrusion, which enters the second engaging hole from the radially inner side and engages. According to this method, when the gear housing is pressed against the gearbox support, the second engaging protrusion engages with the second engaging hole, thus securing the gear housing to the gearbox support.

[0018] In this invention, a washer can be disposed between the gearbox and the gearbox support, with the radially outer end of the washer clamped between the gear housing and the gearbox support. This arrangement improves the sliding properties of the gears used in the gearbox. Furthermore, by connecting the gearbox to a retaining member fixed to the motor, the washer can be secured.

[0019] In this invention, the following approach can be adopted: the plurality of gears may include a planetary gear that meshes with an internal gear formed on the inner circumferential surface of the gear housing.

[0020] In this invention, the geared motor can be configured such that a wiring board is disposed on the outer periphery of the motor, and the retaining member has a board support portion that extends from the gearbox support portion toward the outer periphery of the motor and supports the wiring board radially inward. According to this configuration, the gearbox can be held at the output side of the motor using the retaining member for fixing the wiring board to the outer periphery of the motor. Therefore, a geared motor in which the wiring board is fixed to the outer periphery of the motor via the retaining member can be provided without significantly increasing assembly time or adding new components. Thus, a geared motor in which the wiring board is fixed to the outer periphery of the motor via the retaining member can be provided inexpensively.

[0021] Invention Effects

[0022] In the geared motor of the present invention, the motor includes a first engaging portion that engages with and retains the gearbox support portion, thus enabling the gearbox support portion to be fixed to the motor via engagement. Therefore, screw holes or screws can be omitted, thereby reducing the number of parts and manufacturing time. Furthermore, since the retaining member is made of resin, a structure suitable for engagement with the motor can be easily achieved. Attached Figure Description

[0023] Figure 1 This is a perspective view of a geared electric motor that utilizes the present invention.

[0024] Figure 2 yes Figure 1 The side view of the geared motor shown.

[0025] Figure 3 yes Figure 1 The image shows a cross-sectional view of a geared electric motor.

[0026] Figure 4 It means from Figure 1 The diagram shown is an exploded perspective view of the geared motor after the gear housing has been removed.

[0027] Figure 5 It means Figure 4 An exploded perspective view of gears, etc., as shown.

[0028] Figure 6 It means from Figure 4 The diagram shows an exploded perspective view of the motor after the wiring board and other components have been removed.

[0029] Figure 7 Observing from the opposite side of the output Figure 6 A perspective view of the retaining components, etc.

[0030] Figure 8 It means Figure 1 The diagram illustrates the assembly process of the geared motor.

[0031] Figure 9 This is an explanatory diagram showing an example of a bifurcated protrusion having a first engaging protrusion in the gearbox support portion. Detailed Implementation

[0032] Referring to the accompanying drawings, an example of a geared motor 1 to which the present invention is applied will be described. Furthermore, in the following description, the side on either side of the rotation axis L extending from the rotation center axis L of the motor 10, where the gearbox 2 is located, is the output side L1, and the side opposite to the side where the gearbox 2 is located is the output-opposite side L2. Additionally, when describing the wiring board 3, etc., one side around the rotation center axis L will be labeled CW, and the other side will be labeled CCW.

[0033] (Overall structure of geared motor 1)

[0034] Figure 1 This is a perspective view of the gear motor 1 that applies the present invention. Figure 2 yes Figure 1 The side view of the geared motor 1 shown. Figure 3 yes Figure 1 The cross-sectional view of the geared motor 1 shown. Figure 3 The cross-section of the gear motor 1 after being cut along the rotation center axis L is shown. Figure 4 It means from Figure 1 An exploded perspective view of the gear motor 1 after the gear housing 20 has been removed.

[0035] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the geared motor 1 of this embodiment includes a motor 10, a gearbox 2 disposed on an output side L1 in the direction of the rotation axis L relative to the motor 10, a wiring board 3 disposed on the outer periphery of the motor 10, and a retaining member 7 fixed to the motor 10. The retaining member 7 holds the gearbox 2 and the wiring board 3. That is, the gearbox 2 is held on the output side L1 of the motor 10 by using the retaining member 7 for fixing the wiring board 3 to the outer periphery of the motor 10. Therefore, even without significantly increasing assembly time or adding new components, 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 retaining member 7. Therefore, it is possible to provide a geared motor 1 inexpensively in which the wiring board 3 is fixed to the outer periphery of the motor 10 via the retaining member 7.

[0036] The electric motor 10 has a cylindrical stator 4, a first metal end plate 12, and a second metal end plate 14. The first end plate 12 is fixed to a first end 11 on the output side L1 of the stator 4 by welding or other methods, and the second end plate 14 is fixed to a second end 13 on the opposite output side L2 of the stator 4 by welding or other methods. Therefore, the electric motor 10 includes a first end plate 12 and a second end plate 14 on both sides in the direction of the rotation center axis L. In the electric motor 10, a power supply section 15, including a wiring board 3, is provided on the radially outer side of the stator 4, which constitutes the main body of the motor. In the power supply section 15, an external power supply member 19 is connected to the end of the wiring board 3 on the other side of the circumference (CCW). In this embodiment, the power supply member 19 is a connector 190.

[0037] (Structure of motor 10)

[0038] like Figure 3As shown, the motor 10 is a stepper motor. In the stator 4, the stator 4A for phase A of the output side L1 and the stator 4B for phase B of the opposite output side L2 are arranged overlapping along the rotation axis L. Therefore, in the stator 4, the first winding tube 42A with the first coil 46A wound on it and the second winding tube 42B with the second coil 46B wound on it are arranged overlapping along the rotation axis L. On both sides of the rotation axis L in the first winding tube 42A, an annular inner stator core 43A and an annular outer stator core 44A are arranged overlappingly. On both sides of the rotation axis L in the second winding tube 42B, an annular inner stator core 43B and an annular outer stator core 44B are arranged overlappingly. On the inner circumferential surfaces of the first winding tube 42A and the second winding tube 42B, a plurality of pole teeth 45 of the inner stator cores 43A, 43B and the outer stator cores 44A, 44B are arranged circumferentially. In this embodiment, the outer circumferential portion of the outer stator core 44A extends radially outward from the first winding tube 42A and the second winding tube 42B, thereby forming the motor housing 41. Therefore, the first end 11 of the output side L1 of the stator 4 is formed by the annular portion 47 of the outer stator core 44A. The second end 13 of the opposite output side L2 of the stator 4 is formed by the annular portion 48 of the outer stator core 44B.

[0039] A rotor 5 is coaxially arranged on the radially inner side of the stator 4. In the rotor 5, a rotation shaft 50 extends along the rotation center axis L and protrudes from the first end plate 12 toward the output side L1. A cylindrical permanent magnet 59 is fixed to the rotation shaft 50 near the output opposite side L2 by an adhesive or the like. On the inner side of the stator 4, the outer peripheral surface of the permanent magnet 59 is radially inner opposite to the pole teeth 45 of the stator 4 at a predetermined interval.

[0040] The rotating shaft 50 is supported by a first bearing 61 held by the first end plate 12 and is rotatable. A washer 66 is disposed between the first bearing 61 and the permanent magnet 59 for the rotating shaft 50 to pass through. On the opposite side L2 of the output of the motor 10, the rotating shaft 50 is supported by a second bearing 62 held by the second end plate 14 and is rotatable. An annular washer 67 is disposed between the second bearing 62 and the permanent magnet 59 for the rotating shaft 50 to pass through.

[0041] (Structure of Gearbox 2)

[0042] Figure 5 It means Figure 4 An exploded perspective view of gears, etc., as shown. Figure 3 , Figure 4 and Figure 5As shown, the gearbox 2 includes a plurality of gears as described below and a cylindrical gear housing 20 housing the plurality of gears inside. A serrated portion 250 of the output member 25 protrudes from the gear housing 20 toward the output side L1. In this embodiment, the plurality of gears includes planetary gears that mesh with internal gears 201 formed on the inner circumferential surface of the gear housing 20. A three-stage planetary gear mechanism 21, 22, and 23 arranged along the rotational central axis L is formed inside the gear housing 20. Therefore, the rotation of the motor 10 is reduced and transmitted to the output member 25.

[0043] The first-stage planetary gear mechanism 21 consists of a sun gear 210 fixed to the rotating shaft 50 of the motor 10, a planet carrier 211, three planet gears 212 rotatably held on the planet carrier 211, and an internal gear 201 disposed on the inner circumferential surface of the gear housing 20. The second-stage planetary gear mechanism 22 consists of a sun gear 220 and a planet carrier 221 disposed on the planet carrier 211 of the preceding-stage planetary gear mechanism 21, three planet gears 222 rotatably held on the planet carrier 221, and an internal gear 201 disposed on the inner circumferential surface of the gear housing 20. The third-stage planetary gear mechanism 23 consists of a sun gear 230 and a planet carrier 231 disposed on the planet carrier 221 of the preceding-stage planetary gear mechanism 22, three planet gears 232 rotatably held on the planet carrier 231, and an internal gear 201 disposed on the inner circumferential surface of the gear housing 20. Here, the planet carrier 231 is configured as part of the output member 25.

[0044] (Structure of the first terminal block 151 and the second terminal block 152)

[0045] Figure 6 It means from Figure 4 An exploded perspective view of the motor 10 after the wiring board 3 and other components have been removed. Figure 3 and Figure 6 As shown, the motor housing 41 has a cutout 410 that removes a portion of the circumferential direction. In the first winding tube 42A, at an angular position corresponding to the cutout 410, a first terminal block 151 is provided at the radially outer end of the flange portion 420A on the output-opposite side L2. In the first terminal block 151, two pin-shaped first terminals 152 are held in a circumferentially separated position. The radially outer end of the first terminal block 151 and the two first terminals 152 protrude radially outward from the cutout 410. In the second winding tube 42B, at an angular position corresponding to the cutout 410, a second terminal block 153 is provided at the radially outer end of the flange portion 420B on the output-opposite side L2. In the second terminal block 153, two pin-shaped second terminals 154 are held in a circumferentially separated position. At the first terminals 152 and the second terminals 154, the ends of the first coil 46A and the second coil 46B are fixed with solder after winding.

[0046] 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 cutout 410. The first terminals 152 and the second terminals 154 are connected to a wiring substrate 3 arranged opposite to the radially outer end faces of the first terminal blocks 151 and the second terminal blocks 153. More specifically, a total of four through holes 36 are formed in the wiring substrate 3 for the first terminals 152 and the second terminals 154 to pass through. The first terminals 152 and the second terminals 154 are connected to pads 37 formed around the four through holes 36 by solder (not shown).

[0047] In 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 recessed radially inwards from the circumferential ends 151b, 151c, 153b, and 153c. Therefore, the wiring board 3 abuts against the ends 151b, 151c, 153b, and 153c for radial positioning, resulting in the wiring board 3 being positioned with respect to the ends 151b, 151c, 153b, and 153c. Figure 3 The gap G shown is opposite to the portions 151a and 153a corresponding to the roots of the first terminal 152 and the second terminal 154. Therefore, the wiring board 3 does not come into contact with the coil wire wound around the root portions of the first terminal 152 and the second terminal 154, thus reducing the likelihood of coil wire breakage.

[0048] (Structure of retainer 7)

[0049] Figure 7 Observing from the L2 side opposite to the output Figure 6 A perspective view of the retaining member 7, etc., as shown. Figure 3 , Figure 6 and Figure 7As shown, the retainer 7 has a gearbox support portion 71 and a base plate support portion 76. The gearbox support portion 71 overlaps with the first end plate 12, which constitutes the output side L1 of the motor 10, from the output side L1. The base plate support portion 76 extends from the gearbox support portion 71 toward the outer periphery of the motor 10. Therefore, a cutout 29 is provided in the gear housing 20 for the portion of the base plate support portion 76 extending from the gearbox support portion 71 to pass through. Here, the gearbox support portion 71 holds the gearbox 2 from the output-opposite side L2, and the base plate support portion 76 holds the wiring base plate 3 from the radially inward side. Therefore, the gearbox 2 and the wiring base plate 3 can be held by the retainer 7 with its simple structure. The gearbox support portion 71 is a circular plate with approximately the same size as the first end plate 12, and the base plate support portion 76 is a plate-shaped portion extending from the radially outer end of the gearbox support portion 71 toward the output-opposite side L2. In this embodiment, the retainer 7 is made of resin. More specifically, the retainer 7 is made of a reinforced resin with added glass fibers.

[0050] In this embodiment, the retainer 7 is fixed to the motor 10. More specifically, as shown... Figure 7 As shown, the motor 10 includes a first engaging portion 16, which engages with and holds the gearbox support portion 71. In this embodiment, the gearbox support portion 71 includes a plurality of first engaging protrusions 72 protruding toward the motor 10, and the first engaging portion 16 includes a plurality of first engaging holes 160 for the plurality of first engaging protrusions 72 to enter and engage from the output side L1. In this embodiment, since the retaining member 7 overlaps with the first end plate 12 constituting the output side L1 of the motor 10 from the output side L1, the first engaging portion 16, which is composed of the plurality of first engaging holes 160, is provided on the first end plate 12.

[0051] Therefore, when the first engaging protrusion 72 is inserted into the first engaging hole 160 from the output side L1, the claw portion 721, which bends radially outward at the front end of the first engaging protrusion 72, abuts against the surface of the output-opposite side L2 of the first end plate 12, and the retainer 7 is fixed to the first end plate 12. Thus, in this embodiment, by engaging the first engaging protrusion 72 with the first engaging hole 160 when the gearbox support portion 71 of the retainer 7 is pressed towards the motor 10, the gearbox support portion 71 can be fixed to the motor 10. Therefore, screw holes or screws can be omitted, thereby reducing the number of parts and manufacturing time. Furthermore, since the retainer 7 is made of resin, a structure suitable for engaging with the first engaging hole 160 formed in the first end plate 12 of the motor 10 can be easily achieved for the first engaging protrusion 72. In addition, in this embodiment, as... Figure 6As shown, at the opening edge of the output side L1 of the first engaging hole 160, both the radially inner portion 160a and the radially outer portion 160b are inclined and chamfered. Therefore, it is easy to insert the first engaging protrusion 72 into the first engaging hole 160, and damage and reduction of the first engaging protrusion 72 can be prevented.

[0052] In addition, such as Figure 4 As shown, the gearbox support 71 includes a second engaging portion 73, which engages with and holds the gear housing 20. In this embodiment, the gear housing 20 is provided with a plurality of second engaging holes 26 circumferentially separated in the gear housing 20, and the second engaging portion 73 is composed of a plurality of second engaging protrusions 731 that enter and engage with the plurality of second engaging holes 26 from the radially inward side. Thus, in this embodiment, when the gear housing 20 is pressed against the gearbox support 71, the second engaging protrusions 731 engage with the second engaging holes 26, thereby fixing the gear housing 20 to the gearbox support 71. Therefore, screws and the like can be omitted, thereby reducing the number of parts and manufacturing time. In addition, since the retaining member 7 is made of resin, the second engaging protrusions 731 can be easily adapted to engage with the second engaging holes 26 formed in the gear housing 20.

[0053] like Figure 6 As shown, the substrate support portion 76 is a plate-shaped structure that overlaps with the outer peripheral surface of the motor housing 41 from the radially outer side, and has openings 760 for the radially outer ends of the first terminal block 151, the two first terminals 152, the radially outer ends of the second terminal block 153, and the two second terminals 154 to protrude radially outward from the cutout 410. Therefore, the wiring substrate 3 is connected to the first terminals 152 and the second terminals 154 when it overlaps with the substrate support portion 76 from the radially outer side. Here, the wiring substrate 3 can be either a rigid substrate or a flexible wiring substrate, but in this embodiment, the wiring substrate 3 is a rigid substrate.

[0054] In the substrate support portion 76, the area overlapping with the wiring substrate 3 becomes a recess 77 that is recessed radially inward. When the wiring substrate 3 is positioned radially outward in the recess 77 such that the first terminal 152 and the second terminal 154 are embedded in the four through holes 36, the wiring substrate 3 overlaps with the recess 77. In this state, a portion of the wiring substrate 3 protrudes radially outward from the recess 77, but the size of the wiring substrate 3 protruding radially outward from the recess 77 can be reduced by the recess 77.

[0055] Here, in the recess 77, a first sidewall 771 is provided on one circumferential side CW, and a second sidewall 772 is provided on the output side L1. Therefore, when the wiring board 3 is disposed in the recess 77, the first end 31 of the circumferential side CW of the wiring board 3 abuts against the first sidewall 771 of the recess 77, and the second end 32 of the output side L1 of the wiring board 3 abuts against the second sidewall 772 of the recess 77. Therefore, the wiring board 3 can be reliably fixed to the retaining member 7.

[0056] In contrast, the CCW on the other side of the circumference in the recess 77 and the L2 on the opposite output side do not have sidewalls. Therefore, when the wiring board 3 is overlapped with the recess 77, the third end 33 of the CCW on the other side of the circumference in the wiring board 3 and the fourth end 34 of the L2 on the opposite output side extend out of the board support 76. Here, a [missing information] is formed at the third end 33. Figure 8 The electrode 30 is shown. Therefore, a connector 190 (see reference 30) is connected to the third end 33 of the wiring board 3. Figure 1 ) constitutes the power supply component 19.

[0057] The wiring board 3 has a plurality of third engaging holes 38 penetrating through it, and the board support portion 76 has a plurality of third engaging protrusions 78 that are respectively inserted into the plurality of third engaging holes 38. Therefore, when the wiring board 3 is arranged such that the third engaging protrusions 78 are inserted into the third engaging holes 38, as shown in the figure, the wiring board 3 can be configured such that the wiring board 3 can be configured such that the wiring board 3 can be configured such that the wiring board 3 can be configured such that the wiring board 3 can be inserted into the third engaging holes 38. Figure 2 The solid line La shows the portion protruding from the third engagement hole 38 in the third engagement protrusion 78, as shown in the figure. Figure 2 As shown by the dotted line Lb, the wire is deformed by thermal welding to overlap the wiring substrate 3 from the radially outer side, thereby holding the wiring substrate 3 in the retainer 7. In this embodiment, a plurality of third engaging protrusions 78 are formed by a first protrusion 781 on one circumferential side CW and a second protrusion 782 on the other circumferential side CCW, and a plurality of third engaging holes 38 are formed by a first hole 381 for inserting the first protrusion 781 and a second hole 382 for inserting the second protrusion 782. The first hole 381 is a slot extending in a groove shape to the first end 31 of the wiring substrate 3, and a rib-shaped protrusion 780 connecting the first protrusion 781 to the first sidewall 771 is formed on the bottom wall 770 of the recess 77.

[0058] (Structure of washer 8)

[0059] like Figure 3 and Figure 4As shown, an annular washer 8 is disposed between the gearbox 2 and the gearbox support 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 gearbox 2 and the gearbox support 71. Therefore, since the planetary gear 212 does not directly contact the gearbox support 71, sliding losses can be reduced. In particular, in this embodiment, when the retainer 7 is resin molded, since the gearbox support 71 is provided with a hole 710 for arranging a mold for setting the first engaging protrusion 72 (see reference) Figure 6 Therefore, the planetary gear 212 might get caught on the edge of the hole 710, but with the washer 8, this is less likely to happen. Furthermore, the washer 8 has approximately the same external dimensions as the gearbox support 71. Therefore, the end of the washer 8 will 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 steel or stainless steel.

[0060] Here, the inner diameter of the end 27 on the output-opposite side L2 of the gear housing 20 is larger than the portion where the internal gear 201 is formed. Therefore, the end 27 of the gearbox 2 includes an annular wall portion 271 that surrounds the gearbox support portion 71 radially outward and an annular stepped portion 272 facing the output-opposite side L2. Furthermore, 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 outer peripheral end 81 of the washer 8 is held between the gearbox support portion 71 and the stepped portion 272 of the gear housing 20. Therefore, when the planetary gear 212 of the gearbox 2 rotates in contact with the washer 8, positional displacement of the washer 8 is less likely to occur. Furthermore, since positional displacement of the washer 8 does not occur, deformation of the washer 8 is also less likely to occur. In addition, heat generated by the motor 10 can be suppressed from being transferred to the gearbox 2.

[0061] (Assembly process)

[0062] Figure 8 It means Figure 1 The diagram illustrates the assembly process of the geared motor 1. In the assembly process of the geared motor 1, as shown... Figure 3 and Figure 8As shown, after assembling the planetary gear mechanisms 21, 22, and 23 inside the gear housing 20 to complete the gearbox 2, a washer 8 is placed. On the other hand, a retainer 7 and a wiring board 3 are assembled on the motor 10 side. Next, the gearbox 2 side and the motor 10 side are overlapped along the rotation center axis L. As a result, multiple second engaging protrusions 731 enter and engage with multiple second engaging holes 26 from the radially inward side, thus connecting the gearbox 2 side to the motor 10 side. As a result, the geared motor 1 is completed. Furthermore, the wiring board 3 can be fixed to the retainer 7 at any time before or after the above assembly.

[0063] This implementation method is being carried out Figure 8 During the process shown, the retaining member 7 fixed to the motor 10 can be joined to the gearbox 2 while the radially outer end 81 of the washer 8 overlaps with the stepped portion 272 of the gear housing 20, thus facilitating assembly. Furthermore, after assembly, as... Figure 2 As shown, the second engaging protrusion 731 of the retainer 7 engages with the second engaging hole 26 of the gear housing 20. Even in this state, the outer peripheral end 81 of the washer 8 can be visually confirmed through the second engaging hole 26. Therefore, even at the stage after the gear motor 1 is assembled, it is possible to confirm whether the washer 8 is present or not.

[0064] (Other implementation methods)

[0065] In the above embodiment, the first engaging protrusion 72 of the gearbox support portion 71 of the retainer 7 has a claw portion 721 that abuts against the surface of the first end plate 12 opposite to the output side L2 when it enters the first engaging hole 160 from the output side L1. The claw portion 721 is bent radially outward at the front end of the first engaging protrusion 72, for example. That is, the first engaging protrusion 72 includes, in the direction of the rotation center axis: a base region, which is the region of the first engaging protrusion 72 that protrudes from the gearbox support portion 71 toward the motor 10 side, and is located on the opposite side of the motor 10 side relative to the claw portion region described later; and a claw portion region, which is connected to the base region and is located in the first engaging protrusion 72 at a portion closer to the motor 10 side than the base region, corresponding to the claw portion 721. The claw portion 721 has a surface that abuts against the surface of the first end plate 12 opposite to the output side L2 (opposite to the first end plate 12). That is, the first engaging protrusion 72 passes through the first engaging hole 160 and hooks onto the first engaging portion 16 (hooked onto the first end plate 12) in the aforementioned claw region. Here, the first engaging protrusion 72 in the claw region protrudes in a direction (e.g., radially) that intersects the direction of the rotation center axis and the direction of the arrangement of the plurality of bifurcated protrusions of the first engaging protrusion 72 described later, compared to the first engaging protrusion 72 in the base region. By engaging the first engaging protrusion 72 with the first engaging hole 160 when the gearbox support portion 71 of the retainer 7 is pressed toward the motor 10, the gearbox support portion 71 can be fixed to the motor 10. However, for example, the first engaging protrusion 72 extends continuously in a direction intersecting the rotation center axis direction with a hook-shaped cross section (see reference). Figure 7 In the case of the structure, the structural strength is relatively high, but the workability is poor when assembling the first engaging protrusion 72 and the motor.

[0066] In contrast, the first engaging protrusion 72 of this disclosure can be configured as a segmented structure having a plurality of bifurcated protrusions 72a spaced apart in a direction intersecting the rotation center axis L. Here, the plurality of bifurcated protrusions are provided while ensuring sufficient strength. In this example, the first engaging protrusion 72 has two bifurcated protrusions 72a spaced apart in a direction orthogonal to the rotation center axis (see reference). Figure 9 More specifically, the first engaging protrusion 72 in this example has two bifurcated protrusions 72a spaced apart in a direction orthogonal to both the rotation center axis and the radial direction. Additionally, in Figure 9 In the example shown, the substrate support 76 is not provided on the retainer 7.

[0067] Multiple bifurcated protrusions may be spaced apart in a direction intersecting the rotational axis along the entire protrusion range (including the base region and the claw region) of the first engaging protrusion 72 protruding from the gearbox support 71, or they may be spaced apart in a direction intersecting the rotational axis on the motor 10 side, starting from the middle of the base region. The first engaging protrusion 72 may be bifurcated at the portion of the first engaging protrusion 72 on the motor 10 side (the portion of the first engaging protrusion 72 on the opposite side of the motor 10 side may be configured to be continuous in a direction intersecting the rotational axis), and may be spaced apart in a direction intersecting the rotational axis at least from the middle of the base region to the end of the first engaging protrusion 72 on the motor 10 side. In the case of having three or more bifurcated protrusions, the bifurcation starting positions between adjacent bifurcated protrusions may be the same or different in the rotational axis direction.

[0068] Thus, the first engaging protrusion 72 of this disclosure can be configured as a segmented type. Therefore, even when the first engaging protrusion 72 is designed with sufficient strength margin in mind, pressing the segmented first engaging protrusion 72 of this disclosure and assembling the first engaging protrusion 72 into the first engaging hole 160 of the motor 10 (first end plate 12) becomes easier. For example, compared to an engaging protrusion with a hook-shaped cross-section continuously extending in a direction intersecting the rotation center axis, the extrusion and assembly workability of the segmented first engaging protrusion 72 of this disclosure is improved. Ideally, the plurality of branched protrusions 72a of the first engaging protrusion 72 are provided at intervals in a direction intersecting the rotation center axis L of the first engaging protrusion 72, thereby making it easier to press the first engaging protrusion 72 and assemble the first engaging protrusion 72 into the first engaging hole 160 of the motor 10.

[0069] In the above embodiment, the wiring substrate 3 is a rigid substrate, but the present invention can also be applied when the wiring substrate 3 is a flexible wiring substrate. Even in this case, the wiring substrate 3 is protected by the retaining member 7, so it is possible to omit the need to attach a reinforcing plate or the like to the flexible wiring substrate.

[0070] In the above embodiment, the first engaging portion 16 of the motor 10 is a first engaging hole 160 that engages with the first engaging protrusion 72 of the gearbox support portion 71. However, the first engaging portion 16 of the motor 10 may also be an engaging protrusion that engages with the engaging hole of the gearbox support portion 71. The number of first engaging protrusions 72 of the gearbox support portion 71 may be two or more. When the first engaging protrusion 72 has multiple bifurcated protrusions, the number of bifurcated protrusions in one first engaging protrusion 72 may be two or more.

[0071] In the above embodiment, the second engaging portion 73 of the gearbox support portion 71 is a second engaging protrusion 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 also be an engaging hole that engages with the engaging protrusion of the gear housing 20.

[0072] In the above embodiment, a substrate support portion 76 is provided on the retaining member 7, but the present invention can also be applied when the substrate support portion 76 is not provided on the retaining member 7. For example, the present invention can also be applied when the retaining member 7 is an annular member that only includes a gearbox support portion 71.

[0073] Symbol Explanation

[0074] 1…Gear motor, 2…Gearbox, 3…Wiring board, 4, 4A, 4B…Stator, 5…Rotor, 7…Retainer, 8…Washer, 10…Motor, 11…First end, 12…First end plate, 13…Second end, 14…Second end plate, 16…First engaging part, 19…Power supply component, 20…Gear housing, 21, 22, 23…Planetary gear mechanism, 25…Output component, 26…Second engaging hole, 41…Motor housing, 42A…First winding tube, 42B…Second winding tube, 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…Gear Box support portion, 72…first engaging protrusion, 73…second engaging portion, 76…substrate 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 portion, 771…first sidewall, 772…second sidewall, 781…first protrusion, 782…second protrusion, G…gap, L…rotation center axis, L1…output side, L2…opposite output side, CW…one side, CCW…the other side.

Claims

1. A geared electric motor, comprising: Electric motor; A retainer, the retainer including a gearbox support portion overlapping the output side end in the direction of the rotation center axis of the motor; and A gearbox, wherein the gearbox is supported by the gearbox support on the output side of the gearbox support. The retainer is made of resin. The electric motor includes a first engaging portion, which engages with and retains the gearbox support portion. The gearbox support has a first engaging protrusion that protrudes toward the motor side. The first engaging portion includes a first engaging hole, through which the first engaging protrusion enters and engages from the output side. The motor includes an end plate for retaining the bearing at its output side end. The end plate is provided with the first engaging hole. When the first engaging protrusion is inserted into the first engaging hole from the output side, the claw portion bent radially outward at the front end of the first engaging protrusion abuts against the surface opposite to the output of the end plate, and the retainer is fixed to the end plate.

2. The geared electric motor as described in claim 1, wherein, The first engaging protrusion includes, in the direction of the rotation center axis, a base region and a claw region located closer to the motor side than the base region, the claw region being connected to the base region, and the first engaging protrusion hooking onto the first engaging portion in the claw region. The first engaging protrusion has a plurality of bifurcated protrusions, which are spaced apart at least in a direction intersecting the direction of the rotation center axis, from the midway of the base region to the motor side end of the first engaging protrusion.

3. The geared electric motor as described in claim 2, wherein, The plurality of bifurcated protrusions of the first engaging protrusion are arranged at intervals in a direction intersecting the rotation center axis direction, covering the entire range of the rotation center axis direction of the first engaging protrusion.

4. The geared electric motor according to any one of claims 1 to 3, wherein, The gearbox includes a plurality of gears and a gear housing that houses the plurality of gears on the inside. The gearbox support includes a second engaging portion, which engages with the gear housing and retains the gear housing.

5. The geared electric motor as described in claim 4, wherein, The gear housing is provided with a second engagement hole that extends radially through it. The second engaging portion includes a second engaging protrusion, which enters the second engaging hole from the radially inner side and engages.

6. The geared electric motor as described in claim 4, wherein, When the retainer is resin molded, a hole is provided in the gearbox support portion for assembling a mold for the first engaging protrusion. A washer is disposed between the gearbox and the gearbox support. The radially outer end of the washer is clamped between the gear housing and the gearbox support.

7. The geared electric motor as described in claim 4, wherein, Among the plurality of gears is a planetary gear that meshes with an internal gear formed on the inner circumferential surface of the gear housing.

8. The geared electric motor according to any one of claims 1 to 3, wherein, The geared motor has a wiring board disposed on the outer periphery of the motor. The retainer has a base plate support portion that extends from the gearbox support portion toward the outer periphery of the motor and supports the wiring base plate from the radially inner side.

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