Gear motor

Abstract

Provided is a gear motor capable of fixing a gasket for reducing the sliding resistance of a gear of a gear case without adding a manufacturing process. A gear motor (1) has a motor (10), a gear case (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 case support portion (71) overlaps with the end portion of the output side (L1) of the motor (10), and the gear housing (20) and the gear case support portion (71) are fixed by engagement. A gasket (8) is disposed between the gear case (2) and the gear case support portion (71), and the end portion (81) of the outer circumferential side of the gasket (8) is sandwiched between the gear housing (20) and the gear case support portion (71). The holder (7) has a substrate support portion (76) that supports a wiring substrate (3) from the radially inner side. The gasket (8) is a sliding gasket composed of a steel material such as stainless steel.

Description

[0001] The present application relates to a gear motor in which a gear case is integrated with a motor. BACKGROUND

[0002] In a gear motor in which a gear case is integrated with a motor, a metal support plate that supports the gear case is disposed between the motor and the gear case (see Patent Document 1).

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENT

[0005] Patent Document 1: Japanese Patent Laid-Open No. 2019-66023 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] The support plate described in Patent Document 1 is selected in terms of strength in order to hold a support shaft that rotatably supports a gear. Therefore, when the gear comes into contact with the support plate, the sliding resistance between the support plate and the gear is large, and thus the sliding loss is large. Therefore, a structure in which a washer is disposed between the support plate and the gear is considered, but when only the washer is disposed, the position of the washer is deviated with rotation of the gear, and as a result, the outer peripheral end of the washer is rubbed against the gear, and the sliding loss becomes large. On the other hand, there is a problem that in order to fix the washer, the assembly man-hours are increased.

[0008] In view of the above problems, the technical problem of the present application is to provide a gear motor in which a washer for reducing the sliding resistance of a gear of a gear case can be fixed without adding manufacturing steps.

[0009] TECHNICAL SOLUTION

[0010] In order to solve the above problems, in the present application, the gear motor is characterized by having: a motor; a holding member including a gear case support portion overlapping an end portion of an output side in a direction of a rotation center axis of the motor; a gear case supported by the gear case support portion at the output side of the gear case support portion; and a washer disposed between the gear case and the gear case support portion, the gear case including a plurality of gears and a gear housing that houses the plurality of gears inside, and an end portion of a radially outer side of the washer being sandwiched between the gear housing and the gear case support portion.

[0011] In the gear motor of the present application, a washer is arranged between the gear case and the gear case support portion, so even when the gear used in the gear case moves toward the gear case support portion side, the gear slides against the washer. Therefore, the sliding resistance of the gear is low. In addition, the end portion of the washer on the radially outer side is sandwiched between the gear housing and the gear case support portion, so if the holding member fixed to the motor is combined with the gear case, the washer can be automatically fixed. Therefore, the washer can be fixed even without adding a manufacturing process.

[0012] In the present application, the following mode can be employed: a limiting portion is provided on the surface of the output side of the gear case support portion, and the limiting portion regulates the position of the washer on the radially outer side of the washer. According to the above mode, the position range of the washer can be regulated (maintained), for example, the holding member can be combined with the gear case in a state where the position of the washer is regulated by the limiting portion, and the movement of the washer inside the gear case, the movement of the washer on the holding member, and the interference with other members can be suppressed. Furthermore, the rotation failure of the assembled gear motor can be further improved.

[0013] In the present application, the following mode can be employed: the limiting portion has a plurality of limiting protrusions protruding from the surface toward the output side, and the washer is clearance-fitted with the plurality of limiting protrusions from the radially inner side. According to the above mode, the gear case support portion with the limiting portion is easy to machine.

[0014] In the present application, the following mode can be employed: the limiting portion has a limiting recess formed by recessing the surface toward the side opposite to the output side, the washer is provided in the limiting recess, and the washer is clearance-fitted with the side wall of the limiting recess from the radially inner side. According to the above mode, the gear case support portion with the limiting portion is easy to machine.

[0015] In the present application, the following mode can be employed: the end portion of the gear case support portion in the gear housing includes a circular ring-shaped inner wall portion that surrounds the gear case support portion from the radially outer side, and a circular ring-shaped stepped portion that faces the gear case support portion side at a position adjacent to the inner wall portion on the output side, and the end portion of the washer on the radially outer side is sandwiched between the stepped portion and the gear case support portion. According to the above mode, the holding member fixed to the motor can be combined with the gear case in a state where the end portion of the washer on the radially outer side overlaps the stepped portion of the gear housing, so the assembly becomes easy.

[0016] In the present application, the following mode can be adopted: the above-mentioned holding member is made of resin, and the above-mentioned motor includes a first engaging portion that engages with and holds the above-mentioned gear case supporting portion. According to the above-mentioned mode, the gear case supporting portion can be fixed to the motor by engagement, and thus, a screw hole or a screw can not be provided. Therefore, the number of components and the manufacturing man-hours can be reduced. In addition, since the holding member is made of resin, a structure suitable for engagement with the motor can be easily realized.

[0017] In the present application, the following mode can be adopted: the above-mentioned gear case supporting portion has a first engaging protrusion that protrudes toward the above-mentioned motor side, and the above-mentioned first engaging portion includes a first engaging hole into which the above-mentioned first engaging protrusion enters from the above-mentioned output side and engages. According to the above-mentioned mode, by pressing the gear case supporting portion toward the motor side, the holding member can be fixed to the motor.

[0018] In the present application, the following mode can be adopted: the above-mentioned motor includes an end plate that holds a bearing at an end portion on the above-mentioned output side, and the above-mentioned first engaging hole is provided in the above-mentioned end plate.

[0019] In the present application, the following mode can be adopted: the above-mentioned gear case supporting portion includes a second engaging portion that engages with and holds the above-mentioned gear housing. According to the above-mentioned mode, the gear housing can be fixed to the gear case supporting portion by engagement. Therefore, when the gear housing is fixed to the gear case supporting portion, a screw or the like can not be provided, and thus, the number of components and the manufacturing man-hours can be reduced. In addition, since the holding member is made of resin, a structure suitable for engagement with the gear housing can be easily realized.

[0020] In the present application, the following mode can be adopted: a second engaging hole that penetrates in a radial direction is provided in the above-mentioned gear housing, and the above-mentioned second engaging portion includes a second engaging protrusion that enters the above-mentioned second engaging hole from the radially inner side and engages. According to the above-mentioned mode, when the gear housing is pressed toward the gear case supporting portion, the second engaging protrusion engages with the second engaging hole, and thus, the gear housing can be fixed to the gear case supporting portion. The above-mentioned position limiting portion, for example, defines the position of the above-mentioned washer at a radially inner side than the above-mentioned second engaging protrusion. Thereby, the position range of the washer can be defined (held), and in particular, interference of the washer with the second engaging protrusion can be suppressed, and the assembly can be further improved.

[0021] In the present application, the following mode can be adopted: in a state where the above-mentioned second engaging protrusion engages with the above-mentioned second engaging hole, an end portion of the outer periphery side of the above-mentioned washer can be visually confirmed from the above-mentioned second engaging hole. According to the above-mentioned mode, at the stage where the assembly of the gear motor is completed, whether or not the washer is present can be confirmed.

[0022] In the present application, the following mode can be adopted: the plurality of gears include a planetary gear that engages with an internal gear formed in an inner circumferential surface of the gear housing.

[0023] In the present application, the following mode can be adopted: the gear motor has a wiring board disposed on the outer circumferential side of the motor, the holding member has a board support portion that extends from the gear case support portion toward the outer circumferential side of the motor and supports the wiring board from the radially inner side. According to the above mode, the gear case can be held on the output side of the motor by the holding member for fixing the wiring board on the outer circumferential side of the motor, and thus a gear motor in which the wiring board is fixed on the outer circumferential side of the motor via the holding member can be provided without greatly increasing assembly man-hours or adding new components. Therefore, a gear motor in which the wiring board is fixed on the outer circumferential side of the motor via the holding member can be provided at low cost.

[0024] Effects of the Invention

[0025] In the gear motor of the present application, the washer is disposed between the gear case and the gear case support portion, and thus the gear slides against the washer even when the gear used in the gear case moves toward the gear case support portion. Therefore, the sliding resistance of the gear is low. In addition, the end portion of the washer on the radially outer side is sandwiched between the gear housing and the gear case support portion, and thus the washer can be automatically fixed if the holding member fixed to the motor is combined with the gear case. Therefore, the washer can be fixed without adding a manufacturing process. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a perspective view of a gear motor to which the present application is applied.

[0027] Figure 2 is a side view of the gear motor shown in Figure 1 .

[0028] Figure 3 is a cross-sectional view of the gear motor shown in Figure 1 .

[0029] Figure 4 is an exploded perspective view showing a state in which the gear housing is removed from the gear motor shown in Figure 1 .

[0030] Figure 5 is an exploded perspective view showing the gear and the like shown in Figure 4 .

[0031] Figure 6 is an exploded perspective view showing a state in which the wiring board and the like are removed from the motor shown in Figure 4 .

[0032] Figure 7 is viewed from the output opposite side Figure 6 is a perspective view of the holding member and the like.

[0033] Figure 8 is a view showing Figure 1 is an explanatory view of an assembly process of the gear motor.

[0034] Figure 9 is an explanatory view showing an example of a gear case support portion having a limiting portion.

[0035] Figure 10 is an explanatory view showing another example of a gear case support portion having a limiting portion. DETAILED DESCRIPTION

[0036] An example of a gear motor 1 to which the present application is applied will be described with reference to the drawings. In the following description, one side of a rotational axis L direction in which a rotational center axis L of the motor 10 extends, on which side the gear case 2 is provided, is an output side LI, and the other side opposite to the side on which the gear case 2 is provided is an output opposite side L2. In addition, when the wiring board 3 and the like are described, the CW is labeled around one side of the rotational center axis L and the CCW is labeled around the other side.

[0037] (Overall structure of the gear motor 1)

[0038] Figure 1 is a perspective view of the gear motor 1 to which the present application is applied. Figure 2 is Figure 1 is a side view of the gear motor 1. Figure 3 is Figure 1 is a cross-sectional view of the gear motor 1. Figure 3 shows a cross section after the gear motor 1 is cut along the rotational center axis L. Figure 4 is an exploded perspective view showing a form after the gear housing 20 of the gear motor 1 is removed. Figure 1

[0039] As Figure 1 , Figure 2 , Figure 3 and Figure 4 ​As shown, the gear motor 1 of the present embodiment has the motor 10, the gear box 2 disposed on the output side L1 in the direction of the rotation axis L with respect to the motor 10, the wiring board 3 disposed on the outer circumferential side of the motor 10, and the holder 7 fixed to the motor 10, the holder 7 holding 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 the holder 7 for fixing the wiring board 3 to the outer circumferential side of the motor 10. Therefore, the gear motor 1 in which the wiring board 3 is fixed to the outer circumferential side of the motor 10 via the holder 7 can be provided without greatly increasing assembly man-hours or adding new components. Therefore, the gear motor 1 in which the wiring board 3 is fixed to the outer circumferential side of the motor 10 via the holder 7 can be provided at low cost.

[0040] The motor 10 has the cylindrical stator 4, the first end plate 12 made of metal, and the second end plate 14 made of metal, the first end plate 12 being fixed to the first end portion 11 on the output side L1 of the stator 4 by welding or the like, and the second end plate 14 being fixed to the second end portion 13 on the output opposite side L2 of the stator 4 by welding or the like. 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, the power supply portion 15 including the wiring board 3 and the like is provided on the outer side in the radial direction of the stator 4 constituting the motor main body. In the power supply portion 15, the end portion on the other side CCW in the circumferential direction of the wiring board 3 is connected to the power supply member 19 from the outside. In the present embodiment, the power supply member 19 is the connector 190.

[0041] (Configuration of motor 10)

[0042] As Figure 3As shown, the motor 10 is a stepping motor, and in the stator 4, a stator 4A for the A phase of the output side LI and a stator 4B for the B phase of the output opposite side L2 are arranged in superposition in the direction of the rotation center axis L. Therefore, in the stator 4, a first bobbin 42A in which the first coil 46A is wound and a second bobbin 42B in which the second coil 46B is wound are arranged in superposition in the direction of the rotation center axis L. On both sides of the rotation center axis L in the first bobbin 42A, a circular ring-shaped inner stator core 43A and a circular ring-shaped outer stator core 44A are arranged in superposition. On both sides of the rotation center axis L in the second bobbin 42B, a circular ring-shaped inner stator core 43B and a circular ring-shaped outer stator core 44B are arranged in superposition. At the inner peripheral surfaces of the first bobbin 42A and the second bobbin 42B, a plurality of pole teeth 45 of the inner stator core 43A, 43B and the outer stator core 44A, 44B are arranged in the circumferential direction. In the present embodiment, the outer peripheral side portion of the outer stator core 44A extends to the radially outer side of the first bobbin 42A and the second bobbin 42B, thereby constituting a motor housing 41. Therefore, the first end portion 11 of the output side LI of the stator 4 is constituted by a ring-shaped portion 47 of the outer stator core 44A. The second end portion 13 of the output opposite side L2 of the stator 4 is constituted by a ring-shaped portion 48 of the outer stator core 44B.

[0043] The rotor 5 is arranged coaxially on the radially inner side of the stator 4. In the rotor 5, a rotation shaft 50 extends in the rotation center axis L, and the rotation shaft 50 protrudes from the first end plate 12 toward the output side LI. A cylindrical permanent magnet 59 is fixed to the rotation shaft 50 at a position close to 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 opposes the pole teeth 45 of the stator 4 at a prescribed interval on the radially inner side.

[0044] The rotation shaft 50 is rotatably supported by a first bearing 61 held by the first end plate 12. A washer 66 through which the rotation shaft 50 penetrates is arranged between the first bearing 61 and the permanent magnet 59. On the output opposite side L2 of the motor 10, the rotation shaft 50 is rotatably supported by a second bearing 62 held by the second end plate 14. A circular ring-shaped washer 67 through which the rotation shaft 50 penetrates is arranged between the second bearing 62 and the permanent magnet 59.

[0045] (Structure of the gear box 2)

[0046] Figure 5 is a perspective view of the gear etc. shown in Fig. 1. Figure 4 is an exploded perspective view of the gear etc. shown in Fig. 1. As shown in Figure 3 , Figure 4 and Figure 5As shown, the gear box 2 includes a plurality of gears described below and a cylindrical gear housing 20 that houses the plurality of gears inside, and a serrated portion 250 of the output member 25 protrudes from the gear housing 20 toward the output side L1. In the present embodiment, the plurality of gears include a planetary gear that meshes with an internal gear 201 formed on an inner circumferential surface of the gear housing 20, and a three-stage planetary gear mechanism 21, 22, 23 is configured on the inside of the gear housing 20 along the rotational center axis L. Thus, the rotation of the motor 10 is reduced in speed and transmitted to the output member 25.

[0047] The first-stage planetary gear mechanism 21 is configured from a sun gear 210 fixed to the rotational shaft 50 of the motor 10, a carrier 211, a total of three planetary gears 212 rotatably held to the carrier 211, and the internal gear 201 provided to the inner circumferential surface of the gear housing 20. The second-stage planetary gear mechanism 22 is configured from a sun gear 220 provided to the carrier 211 of the first-stage planetary gear mechanism 21, a carrier 221, a total of three planetary gears 222 rotatably held to the carrier 221, and the internal gear 201 provided to the inner circumferential surface of the gear housing 20. The third-stage planetary gear mechanism 23 is configured from a sun gear 230 provided to the carrier 221 of the second-stage planetary gear mechanism 22, a carrier 231, a total of three planetary gears 232 rotatably held to the carrier 231, and the internal gear 201 provided to the inner circumferential surface of the gear housing 20. Here, the carrier 231 is configured as part of the output member 25.

[0048] (Structure of first terminal table 151 and second terminal table 152)

[0049] Figure 6 is an exploded perspective view showing a state after the wiring substrate 3 and the like are detached from the motor 10 shown in FIG. 1. Figure 4 is an exploded perspective view showing a state after the wiring substrate 3 and the like are detached from the motor 10 shown in FIG. 1. Figure 3 and Figure 6 As shown, the motor housing 41 is provided with a cutout 410 that cuts a portion of the circumference. In the first bobbin 42A, at an angular position corresponding to the cutout 410, a first terminal table 151 is provided at an end portion on the radially outer side of the flange portion 420A on the output opposite side L2. In the first terminal table 151, two pin-shaped first terminals 152 are held at positions separated along the circumference. The end portion on the radially outer side of the first terminal table 151 and the two first terminals 152 protrude to the radially outer side from the cutout 410. In the second bobbin 42B, at an angular position corresponding to the cutout 410, a second terminal table 153 is provided at an end portion on the radially outer side of the flange portion 420B on the output opposite side L2. In the second terminal table 153, two pin-shaped second terminals 154 are held at positions separated along the circumference. At the first terminals 152 and the second terminals 154, the end portions of the first coil 46A and the second coil 46B are fixed after being wound by soldering.

[0050] The end portion of the first terminal base 151 on the radially outer side, the two first terminals 152, the end portion of the second terminal base 153 on the radially outer side, and the two second terminals 154 protrude from the cutout 410 to the radially outer side, and the first terminals 152 and the second terminals 154 are connected to the wiring board 3 arranged so as to face the end faces on the radially outer sides of the first terminal base 151 and the second terminal base 153. More specifically, a total of four through holes 36 for the first terminals 152 and the second terminals 154 to pass through are formed in the wiring board 3, and 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).

[0051] In the face on the radially outer side of the first terminal base 151 and the face on the radially outer side of the second terminal base 153, the portions 151a, 153a corresponding to the root portions of the first terminals 152 and the second terminals 154 are lower portions that are recessed more to the radially inner side than the end portions 151b, 151c, 153b, 153c on both sides in the circumferential direction. Therefore, the wiring board 3 is positioned in the radial direction by abutting against the end portions 151b, 151c, 153b, 153c, and as a result, the wiring board 3 is positioned in the radial direction with respect to the portions 151a, 153a corresponding to the root portions of the first terminals 152 and the second terminals 154 with the gap G and the portions 151a, 153a shown in the drawing therebetween. Figure 3 Therefore, the wiring board 3 does not come into contact with the coil wire wound around the root portions of the first terminals 152 and the second terminals 154, and thus breakage of the coil wire is less likely to occur.

[0052] (Structure of the holder 7)

[0053] Figure 7 is a perspective view of the holder 7 and the like as viewed from the output opposite side L2. Figure 6 is a perspective view of the holder 7 and the like as viewed from the output opposite side L2. 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.

[0054] 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.

[0055] 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, both the portion 160a on the radially inner side and the portion 160b on the radially outer side are in an inclinedly chamfered shape at the opening edge of the output side Ll of the first engagement hole 160. Therefore, it is easy to insert the first engagement protrusion 72 into the first engagement hole 160, and breakage and reduction of the first engagement protrusion 72 can be prevented.

[0056] In addition, as Figure 4 As shown, the gear case supporting portion 71 includes a second engagement portion 73 that engages with and holds the gear housing 20. In the present embodiment, a plurality of second engagement holes 26 that are separated in the circumferential direction in the gear housing 20 are provided in the gear housing 20, and the second engagement portion 73 is constituted by a plurality of second engagement protrusions 731 that enter the plurality of second engagement holes 26 from the radially inner side and engage. In this way, in the present embodiment, when the gear housing 20 is pressed toward the gear case supporting portion 71, the second engagement protrusions 731 engage with the second engagement holes 26, and thus the gear housing 20 can be fixed to the gear case supporting portion 71. Therefore, it is also possible to not provide a screw or the like, and thus the number of components and manufacturing man-hours can be reduced. In addition, since the holder 7 is made of resin, for the second engagement protrusions 731, a structure that is suitable for engagement with the second engagement holes 26 formed in the gear housing 20 can be easily realized.

[0057] As Figure 6 As shown, the substrate supporting portion 76 is in a plate shape that overlaps the outer circumferential surface of the motor housing 41 from the radially outer side, and an opening portion 760 is formed in which the radially outer side end portion of the first terminal land 151, the two first terminals 152, the radially outer side end portion of the second terminal land 153, and the two second terminals 154 protrude from the cutout 410 to the radially outer side. Therefore, the wiring substrate 3 is connected to the first terminals 152 and the second terminals 154 in a state of overlapping the substrate supporting portion 76 from the radially outer side. Here, the wiring substrate 3 can be either of a rigid substrate and a flexible wiring substrate, but in the present embodiment, the wiring substrate 3 is a rigid substrate.

[0058] In the substrate supporting portion 76, the region overlapping the wiring substrate 3 becomes a recessed portion 77 that is recessed toward the radially inner side, and when the wiring substrate 3 is disposed in the recessed portion 77 from the radially outer side in a manner such that the first terminals 152 and the second terminals 154 are embedded in the four through holes 36, the wiring substrate 3 overlaps the recessed portion 77. In this state, a portion of the wiring substrate 3 protrudes from the recessed portion 77 to the radially outer side, but the size of the wiring substrate 3 protruding from the recessed portion 77 to the radially outer side can be reduced by the recessed portion 77.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] (Structure of washer 8)

[0063] like Figure 3 and Figure 4As shown, a circular ring-shaped washer 8 is arranged between the gear case 2 and the gear case support portion 71. More specifically, the circular ring-shaped washer 8 is arranged between the gear case support portion 71 and the planetary gear 212 used in the first stage planetary gear mechanism 21 of the gear case 2. Thus, since the planetary gear 212 does not directly contact the gear case support portion 71, it is possible to reduce the sliding loss. In particular, in the present embodiment, since the hole 710 (see Figure 6 ) of the mold for providing the first engagement protrusion 72 is provided in the gear case support portion 71 when the retainer 7 is resin-molded, it is possible that the planetary gear 212 will hook on the edge of the hole 710. However, by the washer 8, it is less likely that the planetary gear 212 will hook on the edge of the hole 710. In addition, the washer 8 has substantially the same outer dimensions as the gear case support portion 71. Thus, it is less likely that the end portion of the washer 8 will hook 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.

[0064] Here, the inner diameter of the end portion 27 of the gear housing 20 on the output opposite side L2 side is larger than the portion in which the ring gear 201 is formed. Thus, the end portion 27 of the gear case 2 includes a circular ring-shaped inner wall portion 271 that surrounds the gear case support portion 71 from the radially outer side and a circular ring-shaped step portion 272 that faces the output opposite side L2 side. In addition, the outer diameter of the washer 8 is larger than the inner diameter of the portion in which the ring gear 201 is formed. Thus, the end portion 81 of the washer 8 on the outer peripheral side is held between the gear case support portion 71 and the step portion 272 of the gear housing 20. Thus, when the planetary gear 212 of the gear case 2 rotates in contact with the washer 8, it is less likely that the position of the washer 8 will shift or the like. In addition, since the position of the washer 8 does not shift or the like, it is also less likely that the washer 8 will deform or the like. Furthermore, it is possible to suppress the transfer of heat generated by the motor 10 to the gear case 2.

[0065] (Assembly procedure)

[0066] Figure 8 is a diagram showing Figure 1 The assembly procedure of the gear motor 1 shown in FIG. 1 will be described. In the assembly procedure of the gear motor 1, as shown in Figure 3 and Figure 8After the gear case 2 is completed by assembling the planetary gear mechanisms 21, 22, 23 inside the gear housing 20, the gasket 8 is arranged. On the other hand, the holder 7 and the wiring board 3 and the like are assembled on the motor 10 side. Then, the gear case 2 side and the motor 10 side are overlapped in the direction of the rotation center axis L. As a result, the plurality of second engagement protrusions 731 respectively enter the plurality of second engagement holes 26 from the radially inner side and are engaged, and thus the gear case 2 side and the motor 10 side are combined. As a result, the gear motor 1 is completed. In addition, for the wiring board 3, it is also possible to be fixed to the holder 7 at any timing before or after the above assembly.

[0067] The present embodiment is able to perform Figure 8 When the steps shown in the drawing are performed, the holder 7 fixed to the motor 10 and the gear case 2 are combined in a state in which the end portion 81 of the gasket 8 on the radially outer side is overlapped with the step portion 272 of the gear housing 20, and thus assembly becomes easy. In addition, after the assembly is completed, as shown in the drawing, the second engagement protrusions 731 of the holder 7 and the second engagement holes 26 of the gear housing 20 are engaged, and even in this state, the end portion 81 on the outer circumferential side of the gasket 8 can be visually confirmed from the second engagement holes 26. Thus, even at the stage at which the assembly of the gear motor 1 is completed, it is possible to confirm the presence or absence of the gasket 8. Figure 2

[0068] (Other Embodiments)

[0069] In the above embodiment, the gear case 2 side and the motor 10 side are overlapped in the direction of the rotation center axis L, and the gear case 2 side and the motor 10 side are combined (the holder 7 fixed to the motor 10 and the gear case 2 are combined) to assemble the gear motor 1. When the holder 7 and the gear case 2 are combined, sometimes the gasket 8 moves inside the gear case, moves on the holder 7 (the gear case support portion 71 thereof), interferes with other members (for example, the second engagement protrusions 731), the workability of the combining process of the gear case 2 and the motor 10 deteriorates, and in addition, a rotation failure of the gear motor 1 after the assembly is completed can occur.

[0070] In relation to this, the gear case support portion 71 of the present disclosure can be configured so that a regulation portion 711 is provided on the surface of the output side LI of the gear case support portion 71, and the regulation portion 711 regulates the position of the gasket 8 at a radially outer side than the gasket 8. Thereby, it is possible to regulate (hold) the position range of the gasket 8, for example, it is possible to combine the holder 7 and the gear case 2 in a state in which the position of the gasket 8 is regulated by the regulation portion 711, and it is possible to determine the position of the gasket 8 with respect to the inner wall portion 271 of the end portion 27 of the gear case 2, and it is possible to further improve the rotation failure of the gear motor 1 after the assembly is completed. In the present example, the regulation portion 711 regulates the position of the gasket 8 at a radially inner side than the second engagement protrusions 731 (refer to the drawing).​Figure 9 、 Figure 10 ). Thus, the position range of the gasket 8 can be regulated (maintained), and interference of the gasket 8 with the second engagement protrusion 731 can be suppressed. In addition, the position regulating portion 711 can be resin-molded together with the holder 7 to form the position regulating portion 711. In addition, in the example shown in FIG. 10, the substrate support portion 76 is not provided on the holder 7. Figure 9 、 Figure 10

[0071] In one example, the position regulating portion 711 has a plurality of (for example, three) position regulating protrusions 712 that protrude from the surface of the output side L1 of the gear case support portion 71 toward the output side L, and the gasket 8 is clearance-fitted from the radially inner side with the plurality of position regulating protrusions 712 (refer to FIG. 11). Thus, the gear case support portion 71 with the position regulating portion 711 is easy to machine. Here, clearance-fitting refers to fitting in a form in which the outer diameter of the gasket is slightly smaller than the inner diameter of the position regulating portion, and there is always a clearance. In the present example, the plurality of position regulating protrusions 712 are arranged, for example, in the circumferential direction around the rotation center axis L, and the number of the plurality of position regulating protrusions 712 can be three or more. Figure 9

[0072] In another example, the position regulating portion has a position regulating recess 713 that is a groove portion formed by recessing the surface of the output side L1 of the gear case support portion 71 toward the side opposite to the output side (output opposite side L2) (refer to FIG. 12). The position regulating recess 713 includes a side wall that surrounds the gasket 8 from the radially outer side and a ring surface toward the output side L1 side. The gasket 8 is provided to the position regulating recess 713, and the gasket 8 is clearance-fitted from the radially inner side with the side wall of the position regulating recess 713. Thus, the gear case support portion 71 with the position regulating portion 711 is easy to machine. When viewed in a direction orthogonal to the direction of the rotation center axis L, at least the portion of the gasket 8 on the output opposite side L2 is housed in the space surrounded by the side wall and the ring surface of the position regulating recess 713. In the present example, the position regulating recess 713 is formed in a shape corresponding to the outer peripheral shape of the gasket 8. Figure 10

[0073] In the above-described embodiment, the wiring substrate 3 is a rigid substrate, but the present application 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 holder 7, and thus, it is possible to omit the adhesion of a reinforcing plate or the like on the flexible wiring substrate.

[0074] In the above-described embodiment, the first engagement portion 16 of the motor 10 is a first engagement hole 160 that engages with the first engagement protrusion 72 of the gear case support portion 71, but the first engagement portion 16 of the motor 10 can also be an engagement protrusion that engages with the engagement hole of the gear case support portion 71.

[0075] ​​​In the above embodiment, the second engagement portion 73 of the gear case support portion 71 is 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 case support portion 71 can also be an engagement hole into which the engagement protrusion of the gear housing 20 engages.

[0076] In the above embodiment, the substrate support portion 76 is provided on the retainer 7, but the present application can also be applied in cases where the substrate support portion 76 is not provided on the retainer 7. For example, the present application can also be applied in cases where the retainer 7 is a circular ring-shaped member that includes only the gear case support portion 71.

[0077] Explanation of Symbols

[0078] 1…geared motor, 2…gear case, 3…wiring substrate, 4, 4A, 4B…stator, 5…rotor, 7…retainer, 8…washer, 10…motor, 11…first end portion, 12…first end plate, 13…second end portion, 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 housing, 42A…first bobbin, 42B…second bobbin, 43A, 43B…inner stator core, 44A, 44B…outer stator core, 45…pole tooth, 46A…first coil, 46B…second coil, 50…rotary shaft, 59…permanent magnet, 61…first bearing, 62…second bearing, 71…gear case support portion, 72…first engagement protrusion, 73…second engagement portion, 76…substrate support portion, 77…recess, 78…third engagement protrusion, 151…first terminal platform, 152…first terminal, 153…second terminal platform, 154…second terminal, 160…first engagement hole, 190…connector, 201…internal tooth gear, 212, 222, 232…planetary gear, 271…inner wall portion, 272…step portion, 381…first hole, 382…second hole, 731…second engagement protrusion, 760…opening portion, 771…first side wall, 772…second side wall, 781…first protrusion, 782…second protrusion, G…gap, L…rotary center axis, L1…output side, L2…output opposite side, CW…one side, CCW…other side.

Claims

1. A gear motor having: a motor; a holder including a gear case supporting portion overlapping an end portion of an output side in a direction of a center axis of rotation of the motor; a gear case supported by the gear case supporting portion on the output side of the gear case supporting portion; and a gasket disposed between the gear case and the gear case supporting portion, the gear case including a plurality of gears and a gear housing that houses the plurality of gears inside, an end portion of a radially outer side of the gasket being sandwiched between the gear housing and the gear case supporting portion, the gear case supporting portion including a second engaging portion that engages with the gear housing and holds the gear housing, a second engaging hole that penetrates in a radial direction is provided in the gear housing, the second engaging portion includes a second engaging protrusion that enters the second engaging hole from a radially inner side and engages, in a state where the second engaging protrusion and the second engaging hole are engaged, an end portion of an outer circumferential side of the gasket is visually confirmable from the second engaging hole.

2. The gear motor according to claim 1, wherein a limit portion that defines a position of the gasket at a radially outer side than the gasket is provided on a surface of the output side of the gear case supporting portion.

3. The gear motor according to claim 2, wherein the limit portion has a plurality of limit protrusions that protrude from the surface toward the output side, and the gasket is clearance-fitted with the plurality of limit protrusions from a radially inner side.

4. The gear motor according to claim 2, wherein the limit portion has a limit recess that is formed by recessing the surface toward a side opposite to the output side, the gasket is disposed in the limit recess, and the gasket is clearance-fitted with a side wall of the limit recess from a radially inner side.

5. The gear motor according to claim 1, wherein an end portion of the gear case supporting portion side in the gear housing includes a circular ring-shaped inner wall portion that surrounds the gear case supporting portion from a radially outer side, and a circular ring-shaped step portion that faces the gear case supporting portion side at a position adjacent to the inner wall portion on the output side, and an end portion of a radially outer side of the gasket is sandwiched between the step portion and the gear case supporting portion.

6. The gear motor according to any one of claims 1 to 5, wherein the holder is made of resin, and the motor includes a first engaging portion that engages with the gear case supporting portion and holds the gear case supporting portion.

7. The gear motor according to claim 6, wherein the gear case supporting portion has a first engaging protrusion that protrudes toward the motor side, and the first engaging portion includes a first engaging hole into which the first engaging protrusion enters from the output side and engages.

8. The gear motor according to claim 7, wherein an end portion of the motor on the output side includes an end plate that holds a bearing, and the first engaging hole is provided in the end plate.

9. The gear motor according to any one of claims 1 to 5, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Among the plurality of the gears, a planetary gear engaged with an internal gear formed in an inner circumferential surface of the gear housing is included.

10. The gear motor according to any one of claims 1 to 5, wherein The gear motor has a wiring board disposed on an outer circumferential side of the motor, The holder has a board support portion that extends from the gear case support portion toward an outer circumferential side of the motor and supports the wiring board from a radially inner side.

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