CN115149717A - Gear motor - Google Patents

Abstract

Provided is a gear motor capable of reducing the number of parts and the number of manufacturing steps. The gear case (1) is provided with a motor (10), a gear case (2) having a gear housing (20) that accommodates a plurality of gears inside, and a resin holder (7). In the holder (7), a gear case support part (71) overlaps with the end part of the output side (L1) of the motor (10) to support the gear case (2). The gear case support part (71) and the first end plate (12) of the motor (10) are fixed by engagement of a first engagement protrusion (72) of the gear case support part (71) with a first engagement hole (160) provided as a first engagement part (16) in the first end plate (12) of the motor (10). The gear housing (20) and the gear case support section (71) are fixed by engagement. The gear motor (1) has a wiring board (3) on the outer peripheral side of a motor (10), and a holder (7) has a board support section (76) that supports the wiring board (3) from the radially inner side.

Description

Gear motor

Technical Field

The present invention relates to a gear motor in which a gear box and a motor are integrally provided.

Background

In a gear motor in which a gear box and a motor are integrally provided, a holder for supporting the gear box is fixed by a screw between the motor and the gear box (see patent document 1).

Documents of the prior art

Patent literature

Patent document 1: japanese patent laid-open No. 2014-149013

Disclosure of Invention

Technical problem to be solved by the invention

In the structure in which the holder is fixed to the motor by the screw as in the gear motor described in patent document 1, since the screw hole and the screw need to be provided, there is a problem that the number of parts and the number of manufacturing steps are large.

In view of the above problems, an object of the present invention is to provide a gear motor capable of reducing the number of components and the number of manufacturing steps.

Technical scheme for solving technical problem

In order to solve the above problem, the present invention provides a gear motor comprising: an electric motor; a holder including a gear case support portion that overlaps with an end portion on an output side in a rotation center axis direction of the motor; and a gear case supported by the gear case support portion on the output side of the gear case support portion, wherein the holder is made of resin, and the electric motor includes a first engaging portion that engages with the gear case support portion and holds the gear case support portion.

In the gear motor according to the present invention, the motor includes the first engaging portion that engages with the gear case support portion and holds the gear case support portion, and therefore, the gear case support portion can be fixed to the motor by the engagement. Therefore, the screw hole or the screw may not be provided, and the number of parts and the number of manufacturing steps can be reduced. Further, since the holder is made of resin, a structure suitable for engagement with the motor can be easily realized.

In the present invention, the following method can be adopted: the gear case support portion has a first engaging protrusion protruding 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. According to the above aspect, the holder can be fixed to the motor by pressing the gear box support portion toward the motor.

In the present invention, the following method can be adopted: the first engaging projection includes, in the direction of the rotation center axis: a base region; and a claw section region on the motor side of the base section, the claw section region being continuous with the base section, the first engaging convex section being hooked to the first engaging section in the claw section region, the first engaging convex section including: and a plurality of branched convex portions provided at intervals in a direction intersecting with a rotation center axis direction at least in a range from a middle of the base region to an end portion of the first engaging convex portion on the motor side. According to the above aspect, the first engaging protrusion can be pushed in and the assembling workability can be improved while securing a margin in strength.

In the present invention, the following method can be adopted: the plurality of branch convex portions of the first convex engaging portion are provided at intervals in a direction intersecting the direction of the rotation central axis, over the range of the rotation central axis of the first convex engaging portion. According to the above aspect, the fitting and assembling workability of the first engaging convex portion can be further improved while securing a margin of strength.

In the present invention, the following method can be adopted: the motor includes an end plate that holds a bearing at an end portion on the output side, and the end plate is provided with the first engagement hole.

In the present invention, the following method can be adopted: the gear case includes a plurality of gears and a gear housing accommodating the plurality of gears therein, and the gear case support portion includes a second engaging portion that engages with the gear housing and holds the gear housing. According to the above aspect, the gear housing can be fixed to the gear case support portion by engagement. Therefore, when the gear housing is fixed to the gear case support portion, screws or the like need not be provided, and the number of components and the number of manufacturing steps can be reduced. Further, since the holder is made of resin, a structure suitable for engagement with the gear housing can be easily realized.

In the present invention, the following method can be adopted: the gear housing is provided with a second engaging hole that penetrates in the radial direction, and the second engaging portion includes a second engaging protrusion that enters the second engaging hole from the radially inner side and engages therewith. According to the above aspect, when the gear housing is pressed against the gear case support portion, the second engaging convex portion engages with the second engaging hole, and therefore, the gear housing can be fixed to the gear case support portion.

In the present invention, the following method can be adopted: a washer is disposed between the gear case and the gear case support portion, and a radially outer end portion of the washer is sandwiched between the gear case and the gear case support portion. According to the above aspect, the slidability of the gears used in the gear box can be improved. In addition, if the gear case is coupled to a holder fixed to the motor, the washer can be fixed.

In the present invention, the following method can be adopted: the plurality of gears include a planetary gear that meshes with an internal gear formed on an inner circumferential surface of the gear housing.

In the present invention, the following method can be adopted: the gear motor includes a wiring board disposed on an outer peripheral side of the motor, and the holder includes a board support portion that extends from the gear box support portion to the outer peripheral side of the motor and supports the wiring board from a radially inner side. According to the above aspect, the gear case can be held on the output side of the motor by the holder for fixing the wiring board to the outer peripheral side of the motor, and therefore, a gear motor in which the wiring board is fixed to the outer peripheral side of the motor via the holder can be provided without significantly increasing the number of assembly steps or adding new components. Therefore, the gear motor in which the wiring board is fixed to the outer peripheral side of the motor via the holder can be provided at low cost.

Effects of the invention

In the gear motor according to the present invention, the motor includes the first engaging portion that engages with the gear case support portion and holds the gear case support portion, and therefore, the gear case support portion can be fixed to the motor by the engagement. Therefore, the screw hole or the screw may not be provided, and the number of parts and the number of manufacturing steps can be reduced. Further, since the holder is made of resin, a structure suitable for engagement with the motor can be easily realized.

Drawings

Fig. 1 is a perspective view of a gear motor to which the present invention is applied.

Fig. 2 is a side view of the gear motor shown in fig. 1.

Fig. 3 is a sectional view of the gear motor shown in fig. 1.

Fig. 4 is an exploded perspective view showing a form in which a gear housing is removed from the gear motor shown in fig. 1.

Fig. 5 is an exploded perspective view showing the gear and the like shown in fig. 4.

Fig. 6 is an exploded perspective view showing a state where the wiring board and the like are removed from the motor shown in fig. 4.

Fig. 7 is a perspective view of the holder and the like shown in fig. 6, as viewed from the opposite side to the output side.

Fig. 8 is an explanatory view showing an assembly process of the gear motor shown in fig. 1.

Fig. 9 is an explanatory diagram illustrating an example of the branching convex portion provided in the first engaging convex portion of the gear case support portion.

Detailed Description

An example of a gear motor 1 to which the present invention is applied will be described with reference to the drawings. In the following description, of both sides of the rotation axis L direction in which the rotation center axis L of the motor 10 extends, the side on which the gear case 2 is provided is the output side L1, and the side opposite to the side on which the gear case 2 is provided is the opposite output side L2. In the description of the wiring board 3 and the like, CW is given on one side and CCW is given on the other side about the rotation center axis L.

(Integrated configuration of Gear Motor 1)

Fig. 1 is a perspective view of a gear motor 1 to which the present invention is applied. Fig. 2 is a side view of the gear motor 1 shown in fig. 1. Fig. 3 is a sectional view of the gear motor 1 shown in fig. 1. Fig. 3 shows a cross section of the gear motor 1 cut along the rotation center axis L. Fig. 4 is an exploded perspective view showing a form in which the gear housing 20 is removed from the gear motor 1 shown in fig. 1.

As shown in fig. 1, 2, 3, and 4, the gear motor 1 of the present embodiment includes a motor 10, a gear case 2 disposed on an output side L1 in the direction of a rotation axis L with respect to the motor 10, a wiring board 3 disposed on an outer peripheral side of the motor 10, and a holder 7 fixed to the motor 10, and the holder 7 holds the gear case 2 and the wiring board 3. That is, the gear case 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 peripheral side of the motor 10. Therefore, the gear motor 1 in which the wiring board 3 is fixed to the outer peripheral side of the motor 10 via the holder 7 can be provided without significantly increasing the number of assembly steps or adding new components. Therefore, the gear motor 1 in which the wiring board 3 is fixed to the outer peripheral side of the motor 10 via the holder 7 can be provided at low cost.

The motor 10 includes a cylindrical stator 4, a first metal end plate 12, and a second metal end plate 14, the first end plate 12 being fixed to a 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 a second end portion 13 on the opposite output side L2 of the stator 4 by welding or the like. Therefore, the 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 motor 10, a 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, an external power supply member 19 is connected to an end portion of the other side CCW in the circumferential direction of the wiring board 3. In the present embodiment, the power feeding member 19 is a connector 190.

(Structure of Motor 10)

As shown in fig. 3, the motor 10 is a stepping motor, and the stator 4A for the a phase on the output side L1 and the stator 4B for the B phase on the opposite output side L2 are arranged so as to overlap in the direction of the rotation center axis L in the stator 4. Therefore, in the stator 4, the first bobbin 42A around which the first coil 46A is wound and the second bobbin 42B around which the second coil 46B is wound are arranged so as to overlap in the direction of the rotation central axis L. An annular inner stator core 43A and an annular outer stator core 44A are disposed in a superposed manner on both sides in the direction of the rotation center axis L of the first bobbin 42A. An annular inner stator core 43B and an annular outer stator core 44B are disposed in a superposed manner on both sides in the direction of the rotation center axis L of the second bobbin 42B. At the inner peripheral surfaces of the first and second bobbins 42A and 42B, a plurality of pole teeth 45 of the inner stator cores 43A and 43B and the outer stator cores 44A and 44B are arranged in the circumferential direction. In the present embodiment, the outer peripheral side portion of the outer stator core 44A extends radially outward of the first and second bobbins 42A and 42B, thereby constituting the motor case 41. Therefore, the first end portion 11 of the output side L1 of the stator 4 is constituted by the annular portion 47 of the outer stator core 44A. The second end portion 13 of the non-output side L2 of the stator 4 is constituted by the annular portion 48 of the outer stator core 44B.

A rotor 5 is coaxially disposed radially inside the stator 4. In the rotor 5, the rotary shaft 50 extends along the rotation center axis L, and the rotary shaft 50 protrudes from the first end plate 12 to the output side L1. The cylindrical permanent magnet 59 is fixed to the position on the opposite output side L2 of the rotating shaft 50 by an adhesive or the like. Inside the stator 4, the outer peripheral surface of the permanent magnet 59 faces the pole teeth 45 of the stator 4 at a predetermined interval radially inward.

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

(Structure of Gear case 2)

Fig. 5 is an exploded perspective view showing the gear and the like shown in fig. 4. As shown in fig. 3, 4 and 5, the gear housing 2 includes: a cylindrical gear housing 20 accommodating a plurality of gears described below therein, and a serration part 250 of the output member 25 protrudes from the gear housing 20 to the output side L1. In the present embodiment, the plurality of gears include planetary gears that mesh with an internal gear 201 formed on an inner peripheral surface of the gear housing 20, and three-stage planetary gear mechanisms 21, 22, and 23 arranged along the rotation central axis L are configured inside the gear housing 20. Thus, the rotation of the motor 10 is decelerated and transmitted to the output member 25.

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

(Structure of first terminal block 151 and second terminal block 152)

Fig. 6 is an exploded perspective view showing a state where the wiring board 3 and the like are detached from the motor 10 shown in fig. 4. As shown in fig. 3 and 6, the motor case 41 is provided with a cutout 410 having a part of the circumferential direction cut away. In the first bobbin 42A, a first terminal block 151 is provided at an angular position corresponding to the notch 410 at an end portion radially outside the flange portion 420A on the non-output side L2. In the first terminal block 151, two pin-shaped first terminals 152 are held at circumferentially spaced positions. The radially outer end of the first terminal block 151 and the two first terminals 152 protrude radially outward from the notch 410. In the second bobbin 42B, a second terminal block 153 is provided at an angular position corresponding to the notch 410 at an end portion on the radially outer side of the flange portion 420B on the non-output side L2. In the second terminal block 153, two pin-shaped second terminals 154 are held at circumferentially spaced positions. At the first terminal 152 and the second terminal 154, the ends of the first coil 46A and the second coil 46B are fixed by solder after being wound.

The radially outer end portions of the first terminal base 151, the two first terminals 152, the radially outer end portions of the second terminal base 153, and the two second terminals 154 project radially outward from the notch 410, and the first terminals 152 and the second terminals 154 are connected to the wiring board 3 disposed so as to face the radially outer end surfaces of the first terminal base 151 and the second terminal base 153. More specifically, a total of four through holes 36 through which the first terminals 152 and the second terminals 154 penetrate are formed in the wiring substrate 3, and the first terminals 152 and the second terminals 154 are connected to the pads 37 formed around the four through holes 36 by solder (not shown).

Of the radially outer surface of the first terminal base 151 and the radially outer surface of the second terminal base 153, portions 151a and 153a corresponding to the root portions of the first terminals 152 and the second terminals 154 are lower portions recessed radially inward than end portions 151b, 151c, 153b, and 153c on both sides in the circumferential direction. Therefore, the wiring board 3 is positioned in the radial direction by abutting the end portions 151b, 151c, 153b, 153c, and as a result, the wiring board 3 faces the portions 151a, 153a corresponding to the root portions of the first terminal 152 and the second terminal 154 with the gap G shown in fig. 3 interposed therebetween. Therefore, the wiring board 3 does not come into contact with the coil wire wound around the root portions of the first and second terminals 152 and 154, and therefore, the coil wire is less likely to be broken.

(Structure of holder 7)

Fig. 7 is a perspective view of the holder 7 and the like shown in fig. 6 as viewed from the opposite-to-output side L2. As shown in fig. 3, 6, and 7, the holder 7 includes a gear case support portion 71 and a substrate support portion 76, the gear case support portion 71 overlaps the first end plate 12 constituting an end portion of the output side L1 of the motor 10 from the output side L1, and the substrate support portion 76 extends from the gear case support portion 71 toward the outer peripheral side of the motor 10. Therefore, a cutout 29 through which a portion of the substrate support portion 76 extending from the gear case support portion 71 passes is provided in the gear housing 20. Here, the gear case support portion 71 holds the gear case 2 from the opposite-output side L2, and the board support portion 76 holds the wiring board 3 from the radially inner side. Therefore, the gear case 2 and the wiring board 3 can be held by the holder 7 having a simple structure. The gear case support portion 71 is a disc shape having substantially the same size as the first end plate 12, and the substrate support portion 76 is a plate-shaped portion extending from the radially outer end of the gear case support portion 71 toward the opposite output side L2. In the present embodiment, the holder 7 is made of resin. More specifically, the holder 7 is composed of a reinforced resin to which glass fibers are added.

In the present embodiment, the holder 7 is fixed to the motor 10. More specifically, as shown in fig. 7, the motor 10 includes a first engaging portion 16, and the first engaging portion 16 engages with the gear case support portion 71 to hold the gear case support portion 71. In the present embodiment, the gear case support portion 71 includes a plurality of first engaging convex portions 72 protruding toward the electric motor 10 side, and the first engaging portion 16 includes a plurality of first engaging holes 160 into which the plurality of first engaging convex portions 72 enter and engage from the output side L1. In the present embodiment, since the holder 7 overlaps the first end plate 12 constituting the end portion of the output side L1 of the motor 10 from the output side L1, the first engagement portion 16 constituted by the plurality of first engagement holes 160 is provided in the first end plate 12.

Therefore, when the first engaging convex portion 72 is caused to enter the first engaging hole 160 from the output side L1, the claw portion 721 bent radially outward at the tip end portion of the first engaging convex portion 72 abuts against the surface of the first end plate 12 on the opposite-to-output side L2, and the holder 7 is fixed to the first end plate 12. In this way, in the present embodiment, the gear box support portion 71 can be fixed to the motor 10 by the engagement of the first engagement hole 160 and the first engagement convex portion 72 when the gear box support portion 71 of the holder 7 is pressed toward the motor 10. Therefore, the screw hole or the screw need not be provided, and the number of components and the number of manufacturing steps can be reduced. Further, since the holder 7 is made of resin, the first engaging convex portion 72 can be easily configured to be suitable for engaging with the first engaging hole 160 formed in the first end plate 12 of the motor 10. In the present embodiment, as shown in fig. 6, at the opening edge of the output side L1 of the first engagement hole 160, both the portion 160a located radially inward and the portion 160b located radially outward are obliquely chamfered. Therefore, the first engaging convex portion 72 can be easily inserted into the first engaging hole 160, and the first engaging convex portion 72 can be prevented from being damaged and reduced.

Further, as shown in FIG. 4, the gear case support portion 71 includes a second engaging portion 73, the second engaging portion 73 engages with the gear housing 20 to hold the gear housing 20. In the present embodiment, the gear housing 20 is provided with a plurality of second engagement holes 26 that are circumferentially spaced apart in the gear housing 20, and the second engagement portion 73 is formed of a plurality of second engagement protrusions 731 that enter the plurality of second engagement holes 26 from the radially inner side and engage with them. As described above, in the present embodiment, when the gear housing 20 is pressed against the gear case support portion 71, the second engaging convex portion 731 engages with the second engaging hole 26, and therefore, the gear housing 20 can be fixed to the gear case support portion 71. Therefore, screws or the like need not be provided, and the number of components and the number of manufacturing steps can be reduced. Further, since the holder 7 is made of resin, the second engaging projection 731 can easily be configured to be adapted to engage with the second engaging hole 26 formed in the gear housing 20.

As shown in fig. 6, the board support portion 76 has a plate shape that overlaps the outer peripheral surface of the motor case 41 from the radially outer side, and is formed with an opening portion 760 through which the radially outer end portion of the first terminal stand 151, the two first terminals 152, the radially outer end portion of the second terminal stand 153, and the two second terminals 154 protrude radially outward from the cutout 410. Therefore, the wiring board 3 is connected to the first terminal 152 and the second terminal 154 in a state of being overlapped with the board support portion 76 from the radial outside. Here, the wiring board 3 may be either a rigid board or a flexible wiring board, but in the present embodiment, the wiring board 3 is a rigid board.

In the board support portion 76, the region overlapping with the wiring board 3 is a recess 77 recessed inward in the radial direction, and when the wiring board 3 is disposed in the recess 77 from the radial outer side so that the first terminals 152 and the second terminals 154 are fitted into the four through holes 36, the wiring board 3 overlaps with the recess 77. In this state, a part of the wiring board 3 protrudes outward in the radial direction from the recessed portion 77, but the size of the wiring board 3 protruding outward in the radial direction from the recessed portion 77 can be reduced by the recessed portion 77.

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

On the other hand, since no side wall exists on the other side CCW in the circumferential direction and the non-output side L2 in the recess 77, when the wiring board 3 is overlapped with the recess 77, the third end portion 33 of the other side CCW in the circumferential direction of the wiring board 3 and the fourth end portion 34 of the non-output side L2 are in a state of protruding from the board support portion 76. Here, the electrode 30 shown in fig. 8 is formed at the third end portion 33. Therefore, power feeding member 19 including connector 190 (see fig. 1) is connected to third end 33 of wiring board 3.

The wiring board 3 is provided with a plurality of third engaging holes 38 penetrating the wiring board 3, and the board support portion 76 is provided with a plurality of third engaging protrusions 78 fitted into the plurality of third engaging holes 38, respectively. Therefore, when the wiring board 3 is disposed so that the third engaging convex portion 78 is fitted into the third engaging hole 38, the portion of the third engaging convex portion 78 protruding from the third engaging hole 38 as indicated by a solid line La in fig. 2 is deformed by thermal welding so as to overlap the wiring board 3 from the radially outer side as indicated by a dashed-dotted line Lb in fig. 2, and the wiring board 3 is held by the holder 7. In the present embodiment, the plurality of third engaging convex portions 78 are constituted by the first convex portions 781 of the one circumferential side CW and the second convex portions 782 of the other circumferential side CCW, and the plurality of third engaging holes 38 are constituted by the first holes 381 into which the first convex portions 781 are fitted and the second holes 382 into which the second convex portions 782 are fitted. The first hole 381 is a slit extending in a groove-like manner to the first end portion 31 of the wiring substrate 3, and a rib-like protruding portion 780 is formed on the bottom wall 770 of the recess 77 to connect the first protruding portion 781 and the first side wall 771.

(Structure of gasket 8)

As shown in fig. 3 and 4, an annular washer 8 is disposed between the gear case 2 and the gear case support portion 71. More specifically, an annular washer 8 is disposed between the planetary gear 212 used in the first-stage planetary gear mechanism 21 of the gear case 2 and the gear case support portion 71. Therefore, since the planetary gears 212 do not directly contact the gear case support portion 71, the sliding loss can be reduced. In particular, in the present embodiment, when the holder 7 is resin-molded, since the hole 710 (see fig. 6) in which the mold for providing the first engaging convex portion 72 is disposed is provided in the gear case support portion 71, the planetary gear 212 may be caught by the edge of the hole 710, and the washer 8 makes it difficult for the planetary gear 212 to be caught by the edge of the hole 710. The washer 8 has substantially the same outer dimensions as the gear case support portion 71. Therefore, the end of the washer 8 does not catch on the planetary gear 212. The gasket 8 is made of metal. The washer 8 is a slide washer made of a steel material such as stainless steel, for example.

Here, the inner diameter of the end 27 of the gear housing 20 on the non-output side L2 side is larger than the portion where the internal gear 201 is formed. Therefore, the end portion 27 of the gear case 2 includes an annular wall portion 271 surrounding the gear case support portion 71 from the radially outer side and an annular step portion 272 facing the non-output side L2 side. Further, the outer diameter of the washer 8 is larger than the inner diameter of the portion where the internal gear 201 is formed. Therefore, the outer peripheral end 81 of the washer 8 is held between the gear case support portion 71 and the step 272 of the gear housing 20. Therefore, when the planetary gears 212 of the gear case 2 rotate in a state of being in contact with the washer 8, positional displacement of the washer 8 and the like are less likely to occur. Further, since the gasket 8 is not displaced, the gasket 8 is less likely to be deformed. Further, the heat generated by the motor 10 can be suppressed from being transmitted to the gear case 2.

(Assembly Process)

Fig. 8 is an explanatory diagram illustrating an assembly process of the gear motor 1 shown in fig. 1. In the assembly process of the gear motor 1, as shown in fig. 3 and 8, the planetary gear mechanisms 21, 22, and 23 are assembled in the gear housing 20 to complete the gear case 2, and then the washer 8 is disposed. On the other hand, the holder 7, the wiring board 3, and the like are assembled on the motor 10 side. Next, the gear case 2 side and the motor 10 side are overlapped with each other in the direction of the rotation center axis L. As a result, the plurality of second engaging protrusions 731 enter the plurality of second engaging holes 26 from the radially inner side and engage with each other, and therefore the gear case 2 side and the motor 10 side are coupled to each other. As a result, the gear motor 1 is completed. The wiring board 3 may be fixed to the holder 7 at any time before or after the above-described assembly.

In the present embodiment, when the step shown in fig. 8 is performed, the holder 7 fixed to the motor 10 can be coupled to the gear case 2 in a state where the radially outer end 81 of the washer 8 overlaps the step 272 of the gear housing 20, and therefore, assembly is facilitated. After the assembly is completed, as shown in fig. 2, the second engaging convex portion 731 of the holder 7 engages with the second engaging hole 26 of the gear housing 20, and even in this state, the end portion 81 on the outer peripheral side of the washer 8 can be visually confirmed from the second engaging hole 26. Therefore, even at the stage of finishing assembling the gear motor 1, the presence or absence of the washer 8 can be confirmed.

(other embodiments)

In the above embodiment, the first engaging convex portion 72 of the gear case supporting portion 71 of the holder 7 has the claw portion 721 which abuts against the surface of the non-output side L2 of the first end plate 12 when entering the first engaging hole 160 from the output side L1, and the claw portion 721 is bent outward in the radial direction at the tip end portion of the first engaging convex portion 72, for example. That is, the first engaging projection 72 includes, in the rotational center axis direction: a base region in which the first engaging protrusion 72 protrudes from the gear case support portion 71 toward the electric motor 10 side, and is located on the opposite side of the claw region from the electric motor 10 side; and a claw portion region which is continuous with the base region, is located on the motor 10 side of the base region in the first engaging convex portion 72, and corresponds to the claw portion 721. The claw portion 721 has a surface that abuts against the surface of the non-output side L2 of the first end plate 12 (faces the first end plate 12). That is, the first engaging protrusion 72 passes through the first engaging hole 160 and is engaged with the first engaging portion 16 (engaged with the first end plate 12) in the claw portion region. Here, the first engaging convex portion 72 of the claw portion region protrudes in a direction (for example, a radial direction) intersecting the rotation center axis direction and a direction in which a plurality of branched convex portions, which will be described later, of the first engaging convex portion 72 are arranged, compared to the first engaging convex portion 72 of the base portion region. The gear case support portion 71 of the holder 7 can be fixed to the motor 10 by the engagement of the first engagement convex portion 72 with the first engagement hole 160 when the gear case support portion 71 is pressed toward the motor 10. However, for example, in the case where the first engaging protrusion 72 has a structure in which the hook-shaped cross section continuously extends in the direction intersecting the rotation center axis direction (see fig. 7), the structural strength is strong, and workability is poor when the first engaging protrusion 72 and the motor are assembled.

In contrast, the first engaging protrusion 72 of the present disclosure can be configured in a stepwise manner as follows: the rotary actuator includes a plurality of branched convex portions 72a provided at intervals in a direction intersecting the direction of the rotation central axis L. Here, the plurality of branched convex portions are provided while securing a margin of strength. In this example, the first engaging convex portion 72 includes two branched convex portions 72a (see fig. 9) provided at an interval in a direction orthogonal to the rotation center axis direction. More specifically, the first engaging convex portion 72 of the present example includes two branched convex portions 72a provided at intervals in a direction orthogonal to the rotation center axis direction and the radial direction. In the example shown in fig. 9, the substrate support portion 76 is not provided in the holder 7.

The plurality of branched convex portions may be provided at intervals in a direction intersecting the rotation central axis direction over the entire protruding range (including the base region and the claw region) of the first engaging convex portion 72 from the gear case support portion 71, or may be provided at intervals in a direction intersecting the rotation central axis direction on the electric motor 10 side from the middle of the base region. The first convex engaging portion 72 may be formed to branch at a portion of the first convex engaging portion 72 on the motor 10 side (a portion of the first convex engaging portion 72 on the opposite side to the motor 10 side may be formed to be continuous in a direction intersecting the rotation central axis direction), and may be provided at intervals in the direction intersecting the rotation central axis direction at least in a range from a middle of the base region to an end portion of the first convex engaging portion 72 on the motor 10 side. When three or more branched convex portions are provided, the branching start positions between adjacent branched convex portions may be the same or different from each other in the rotation central axis direction.

As described above, the first engaging protrusion 72 of the present disclosure can be formed in a stepwise manner. Thus, even when the first engaging projection 72 is designed in consideration of securing a margin of strength, it is easy to press the first engaging projection 72 of the present disclosure and to assemble the first engaging projection 72 into the first engaging hole 160 of (the first end plate 12 of) the electric motor 10, and the workability of insertion and assembly of the first engaging projection 72 of the present disclosure is improved compared to, for example, an engaging projection having a hook-shaped cross section continuously extending in a direction intersecting the rotation center axis direction. It is desirable that the plurality of branch convex portions 72a of the first engaging convex portion 72 are provided at intervals in the direction intersecting the rotation central axis direction over the range of the rotation central axis L direction of the first engaging convex portion 72, whereby it is easier to press the first engaging convex portion 72 and assemble the first engaging convex portion 72 in the first engaging hole 160 of the motor 10.

Although the wiring board 3 is a rigid board in the above embodiment, the present invention may be applied to a case where the wiring board 3 is a flexible wiring board. Even in this case, since the wiring board 3 is protected by the holder 7, it is possible to omit attaching a reinforcing plate or the like to the flexible wiring board.

In the above embodiment, the first engagement portion 16 of the motor 10 is the first engagement hole 160 that engages with the first engagement convex portion 72 of the gear case support portion 71, but the first engagement portion 16 of the motor 10 may be an engagement convex portion that engages with the engagement hole of the gear case support portion 71. The number of the first engaging projections 72 of the gear case support portion 71 may be two, or three or more. When the first convex engaging portion 72 has a plurality of branched convex portions, the number of branched convex portions of one first convex engaging portion 72 may be two, or three or more.

In the above embodiment, the second engaging portion 73 of the gear case supporting portion 71 is the second engaging protrusion 731 that engages with the second engaging hole 26 of the gear housing 20, but the second engaging portion 73 of the gear case supporting portion 71 may be an engaging hole into which the engaging protrusion of the gear housing 20 engages.

Although the substrate support portion 76 is provided in the holder 7 in the above embodiment, the present invention can be applied to a case where the substrate support portion 76 is not provided in the holder 7. For example, the present invention can be applied to a case where the holder 7 is an annular member including only the gear case support portion 71.

Description of the symbols

1, 8230, gear motor, 2, 8230, gear box, 3, 8230, wiring base plate, 4A, 4B, 8230, stator, 5, rotor, 7, holding piece, 8, 8230, gasket, 10, 8230, motor, 11, 8230, first end, 12, first end plate, 13, 14, second end plate, 16, first clamping part, 19, 8230, power supply member, 20, 8230, gear shell, 21, 22, 23, 8230, planetary gear mechanism 25 \8230, output member 26 \8230, second fastening hole 41 \8230, motor shell 42A \8230, first bobbin 42B \8230, second bobbin 43A and 43B \8230, internal stator core 44A and 44B \8230, external stator core 45 \8230, pole teeth 46A \8230, first coil 46B \8230, second coil 50 \8230, rotary shaft 59 \8230, permanent magnet 61 \8230, first bearing 62 \8230, second bearing 71 method 8230, gear box supporting part 72 method 8230, first clamping convex part 73 method 8230, second clamping part 76 method 8230, substrate supporting part 77 method 8230, concave part 78 method 8230, third clamping convex part 151 method 8230, first terminal platform 152 method 8230, first terminal 153 method 8230, second terminal platform 154 method 8230, second terminal 160 method 8230, first clamping hole 190 method 8230, connector 201 method 8230internal gear, 212, 222, 232 method 8230, planet gear 271, 8230, wall 272, 8230, step 381, 8230, first hole 382, 8230, second hole 731, 8230, second convex part 760, 8230, opening 771, 8230, first side wall 772, 8230, second side wall 781, 8230, first convex part 782, 8230, second convex part G, 8230, gap L8230, central axis of rotation, L1, 8230, output side L2, 8230, output opposite side CW, 8230, one side CCW, 8230and the other side.

Claims (10)

1. A gear motor having:

an electric motor;

a holder including a gear case support portion that overlaps with an end portion on an output side in a rotational center axis direction of the motor; and

a gear case supported by the gear case support portion on the output side of the gear case support portion,

the holder is made of a resin and is formed of a resin,

the motor includes a first engaging portion that engages with the gear case support portion and holds the gear case support portion.

2. The gear motor of claim 1,

the gear case support portion has a first engaging protrusion protruding toward the motor side,

the first engaging portion includes a first engaging hole for the first engaging protrusion to enter from the output side and engage therewith.

3. The gear motor of claim 2,

the first engaging projection includes, in the direction of the rotation center axis: a base region; and a claw section region on the motor side of the base section, the claw section region being continuous with the base section, the first engaging convex section being hooked to the first engaging section in the claw section region,

the first engaging projection includes: and a plurality of branched convex portions provided at intervals in a direction intersecting with a rotation center axis direction at least in a range from a middle of the base region to an end portion of the first engaging convex portion on the motor side.

4. The gear motor of claim 3,

the plurality of branched convex portions of the first engaging convex portion are provided at intervals in a direction intersecting the direction of the rotation central axis, over the range of the rotation central axis direction of the first engaging convex portion.

5. The gear motor of claim 2,

the end of the motor on the output side includes an end plate that holds a bearing,

the end plate is provided with the first clamping hole.

6. The gear motor according to any one of claims 1 to 5,

the gear case includes a plurality of gears and a gear housing accommodating the plurality of gears inside,

the gear case support portion includes a second engaging portion that engages with the gear case and holds the gear case.

7. The gear motor of claim 6,

the gear shell is provided with a second clamping hole which penetrates through the base plate along the radial direction,

the second engaging portion includes a second engaging protrusion that enters the second engaging hole from the radially inner side and engages therewith.

8. The gear motor of claim 6 or 7,

a washer is disposed between the gear case and the gear case support portion,

the radially outer end of the washer is clamped between the gear housing and the gear case support.

9. The gear motor according to any one of claims 6 to 8,

the plurality of gears include planetary gears that mesh with internal gears formed on an inner circumferential surface of the gear housing.

10. The gear motor according to any one of claims 1 to 9,

the gear motor has a wiring board disposed on an outer peripheral side of the motor,

the holder has a substrate support portion that extends from the gear case support portion toward an outer peripheral side of the motor and supports the wiring substrate from a radially inner side.

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