Geared motors and electronic equipment

Abstract

The present invention provides a high-torque gear transmission motor. The gear transmission motor (1) comprises: a motor part (10); a gear transmission part (20) having a cylindrical gear box (28); a cylindrical flange (13) arranged between the motor part (10) and the gear transmission part (20); and a fixing member (30) fixing the flange (13) and the gear box (28). A plurality of coupling parts (131) protruding radially outward are arranged on the side surface (134) of the flange 13. A plurality of connecting parts (282) for accommodating the coupling parts (131) are arranged on the outer peripheral side surface (281) of the gear box (28). The fixing member (30) has an annular part (31) formed in a shape along the circumferential direction of the surface (136) of the coupling part (131) and the outer peripheral side surface (281) of the gear box (28). The annular portion (31) presses at least a portion of the outer peripheral side surface (281) of the gear box (28) against the side surface (134) of the flange (13), thereby fixing the flange (13) and the gear box (28).

Description

Technical Field

[0001] The present invention relates to a geared motor and electronic equipment used in, for example, a medical drug delivery pump or a portable information terminal. Background Art

[0002] Conventionally, as electric mechanisms of various devices, geared motors are used that reduce the rotation output of a motor by a gear transmission mechanism, etc. In such a geared motor, a gear transmission mechanism is arranged in a gear box having the same diameter as the outer diameter of the motor.

[0003] Patent Document 1 discloses a geared motor in which a gear box and a motor are connected by a snap-fit ​​structure in which a hole formed in the gear box and a protrusion formed in a bearing member of the motor are engaged with each other.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2017-11976

[0005] Since the geared motor of Patent Document 1 has a snap-fit ​​structure, the gearbox needs to be deformed when connecting the gearbox to the motor. Therefore, high-strength materials cannot be used as the material of the gearbox, making it difficult to realize a high-torque geared motor. Summary of the invention

[0006] A gear transmission motor according to one embodiment includes: a motor unit having a rotating shaft; a gear transmission unit having an output shaft to which the rotating force of the rotating shaft is transmitted and a cylindrical gear box that rotatably accommodates the output shaft; a cylindrical flange that is provided between the motor unit and the gear transmission unit; and a fixing member that fixes the flange and the gear box. A plurality of coupling portions that protrude radially outward are provided on the side surface of the flange. A plurality of connecting portions that accommodate the coupling portions are provided on the outer peripheral side surface of the gear box. The fixing member includes an annular portion that is formed in a shape along the surface of the coupling portion and the circumferential direction of the outer peripheral side surface of the gear box. The annular portion is arranged across the outer peripheral side surface of the gear box and the coupling portion, and at least a portion of the outer peripheral side surface of the gear box is pressed against the side surface of the flange, thereby fixing the flange and the gear box.

[0007] According to the present invention, a high-torque geared motor can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a diagram showing an electronic device according to an embodiment.

[0009] Figure 2 It is a perspective view of the appearance of the geared motor according to the embodiment.

[0010] Figure 3 It is an exploded perspective view of the gear transmission motor.

[0011] Description of Reference Numerals

[0012] 1 gear transmission motor, 10 motor part, 11 rotating shaft, 12 frame, 13 flange, 20 gear transmission part, 21 output shaft, 28 gear box, 30 fixing member, 31 annular part, 32 end, 100 electronic device, 130 main body, 131, 131a, 131b joint part, 132 storage part, 134 side, 135, 284 storage recess, 134 side, 136 surface, 281 outer peripheral side, 282, 282a, 282b connection part, 285 end area DETAILED DESCRIPTION

[0013] <Implementation Method>

[0014] Hereinafter, a geared motor according to an embodiment and an electronic device having the geared motor will be described with reference to the drawings.

[0015] <Electronic equipment>

[0016] Figure 1 1 is a diagram showing an example of an electronic device 100 having an electric mechanism driven by the output of the gear motor 1 of the present embodiment. The electronic device 100 is, for example, a portable information terminal (portable electronic device). The illustrated electronic device 100 is a smart phone. The electronic device 100 has a camera unit 101. The camera unit 101 is configured to be able to adjust the shooting direction using the output of the gear motor 1. Alternatively, the electronic device 100 may also have a cover that can cover the screen in an openable and closable manner, and the cover is configured to be able to be opened and closed by the output of the gear motor 1. In addition, the electronic device 100 is not limited to the above-mentioned portable information terminal, and can also be used for medical purposes, such as a liquid injection (medication) pump for injecting (medicating) a liquid for insulin injection performed by a patient himself.

[0017] <Geared Motor 1>

[0018] Hereinafter, a geared motor 1 according to an embodiment of the present invention will be described in detail with reference to the drawings. Figure 2 It is an external perspective view of the geared motor 1 according to the embodiment. Figure 3 1 is an exploded perspective view of the gear transmission motor 1. Figure 2 , Figure 3 As shown, the geared motor 1 includes a motor unit 10, a flange 13, a gear transmission unit 20, and a fixing member 30. A rotating shaft 11 of the motor unit 10, which will be described in detail later, and an output shaft 21 of the gear transmission unit 20, which will be described in detail later, are coaxial.

[0019] In the following description, the direction in which the rotating shaft 11 and the output shaft 21 extend is referred to as the Z direction, and Figure 2 , Figure 3 The base point side of the arrow indicating the Z direction is referred to as the - side, and the tip side is referred to as the + side.

[0020] <Motor Unit 10>

[0021] The motor unit 10 is a DC motor including a rotor 11A including a rotating shaft 11, a frame 12, and a terminal mounting portion 14. The rotating shaft 11 is pivotally supported by a flange 13 at an end portion (Z direction + side end portion) on the gear transmission unit 20 side.

[0022] <Frame 12>

[0023] The frame 12 is formed of a metal material, for example, and is a bottomed cylindrical member having a surface 120 at the + side end in the Z direction. The frame 12 forms the outer periphery of the motor unit 10. Specifically, the frame 12 is arranged around the rotor 11A. That is, the frame 12 also functions as a stator of the DC motor.

[0024] An opening 121 is formed on the surface 120 on the positive side in the Z direction of the frame 12, which penetrates the surface 120 inside and outside in the Z direction. A bearing 122 is embedded in the opening 121. An opening 123 is formed on the bearing 122, which penetrates inside and outside in the Z direction. By inserting the rotating shaft 11 into the opening 123, the end of the rotating shaft 11 on the positive side in the Z direction protrudes from the frame 12.

[0025] The terminal mounting portion 14 is provided at the end portion on the - side in the Z direction of the frame 12. The input terminal 141 protruding toward the - side in the Z direction is provided at the terminal mounting portion 14. When power is supplied to the input terminal 141, the rotating shaft 11 of the motor unit 10 rotates.

[0026] <Flange 13>

[0027] The flange 13 is formed of, for example, a resin material and is screwed to the surface 120 of the frame 12 by screws 137. That is, the flange 13 is disposed between the motor unit 10 and the gear transmission unit 20 described later. The flange 13 includes a main body 130, a coupling portion 131, and a housing portion 132.

[0028] The main body 130 has a cylindrical shape extending in the axial direction (Z direction) with the rotating shaft 11 as the center. That is, a through hole 133 is formed in the center of the main body 130 to penetrate the inside and outside of the main body 130 in the Z direction. The rotating shaft 11 is supported by inserting the bearing 122 into the through hole 133. The outer diameter of the main body 130 is smaller than the outer diameter of the frame 12.

[0029] The coupling portion 131 is provided to protrude radially outward from the side surface 134 of the main body portion 130. Figure 3As shown, the coupling part 131 includes two coupling parts 131a and 131b provided at axisymmetric positions about the rotation shaft 11. In addition, the number of coupling parts 131 is not limited to two, and may be three or more.

[0030] In the following description, a direction perpendicular to the Z direction and along the direction in which the two coupling portions 131a and 131b are arranged may be referred to as an X direction. In addition, a direction perpendicular to the X direction and the Z direction may be referred to as a Y direction.

[0031] A receiving recess 135 is formed in the circumferential direction on the surface 136 of the coupling portion 131. The fixing member 30 described later is received in the receiving recess 135. The diameter of the two coupling portions 131 is substantially equal to the outer diameter of the gear box 28 described later. The receiving portion 132 is a recess formed on the side surface of the side surface 134 of the main body 130 on the + side in the Y direction. The end of the fixing member 30 described later is received in the receiving portion 132.

[0032] <Gear Transmission Unit 20>

[0033] The gear transmission unit 20 includes a gear mechanism and a gear box 28 fastened to the output shaft 21. As described above, the output shaft 21 is a member extending in the Z direction and is connected to the rotating shaft 11 via the gear mechanism. Therefore, when the rotating shaft 11 of the motor unit 10 rotates by receiving power supply as described above, its rotational force is transmitted to the output shaft 21 via the gear mechanism, and the output shaft 21 also rotates.

[0034] <Gear box 28>

[0035] The gear box 28 is formed of, for example, a resin material, and has a cylindrical shape with the rotating shaft 11 as the axis. The motor unit 10 side (Z direction - side) of the gear box 28 is open. A circular opening portion 280 is formed on the surface of the gear box 28 on the Z direction + side. The gear box 28 accommodates a gear mechanism fastened to the output shaft 21. The output shaft 21 is inserted into the opening portion 280, and the output shaft 21 is exposed from the gear box 28. In addition, the outer diameter of the gear box 28 is approximately equal to the outer diameter of the frame 12 of the motor unit 10.

[0036] The outer peripheral side surface 281 of the gear case 28 is formed with a connection portion 282, a storage opening portion 283, and a storage recess 284. The connection portion 282 and the storage opening portion 283 are formed by cutting off a portion of the end portion on the Z direction - side of the outer peripheral side surface 281 of the gear case 28, that is, the end portion facing the motor unit 10. In addition, the region of the end portion on the Z direction - side of the outer peripheral side surface 281 where the connection portion 282 and the storage opening portion 283 are not formed is referred to as an end region 285 of the outer peripheral side surface 281.

[0037] The connection portion 282 is formed according to the position where the coupling portion 131 is provided. Specifically, the connection portion 282 includes two connection portions 282a and 282b formed at the axisymmetric positions of the rotating shaft 11 and the output shaft 21. In other words, the connection portions 282a and 282b are formed along the X direction. When the gear box 28 is connected to the motor unit 10, the coupling portion 131 of the flange 13 is inserted into the connection portion 282. That is, the coupling portion 131a is inserted into the connection portion 282a, and the coupling portion 131b is inserted into the connection portion 282b.

[0038] The storage opening 283 is formed according to the position where the storage portion 132 is provided. Specifically, the storage opening 283 is formed on the Y direction + side of the outer peripheral side surface 281 of the gear box 28. When the gear box 28 is connected to the motor unit 10, the storage portion 132 of the flange 13 is inserted into the storage opening 283.

[0039] The accommodating recess 284 is a recess formed along the circumference of the outer peripheral side surface 281. Specifically, the accommodating recess 284 is formed in at least a portion of the outer peripheral side surface 281, namely, the end area 285. The fixing member 30 described later is accommodated in the accommodating recess 284. When the gear box 28 is connected to the motor unit 10, the accommodating recess 284 and the accommodating recess 135 formed on the flange 13 are located on the same outer peripheral line. In other words, in the Z direction, the position where the accommodating recess 284 is formed is roughly consistent with the position where the accommodating recess 135 is formed. Alternatively, it can be said that when the gear box 28 is connected to the motor unit 10, in the Z direction, the distance from the surface 120 of the frame body 12 to the accommodating recess 284 is roughly equal to the distance from the surface 120 of the frame body 12 to the accommodating recess 135.

[0040] <Fixing member 30>

[0041] The fixing member 30 is a member in the shape of a ring such as a C-ring, for example, formed of a metal material such as stainless steel. The fixing member 30 has an annular portion 31 and end portions 32 as both ends of the annular portion 31. When the gear box 28 is connected to the motor unit 10, the annular portion 31 is accommodated in the accommodation recess 135 formed in the flange 13 and the accommodation recess 284 formed in the gear box 28. That is, the annular portion 31 is formed in a shape along the circumferential direction of the surface 136 of the joint portion 131 of the flange 13 and the outer peripheral side surface 281 of the gear box 28. The end portions 32 are accommodated in the storage portion 132 formed in the flange 13. Specifically, after the gear box 28 is connected to the motor unit 10, the annular portion 31 is embedded in the accommodation recesses 135 and 284 from the outside of the gear box 28 and the motor unit 10, thereby installing the fixing member 30.

[0042] <Connection between Motor Unit 10 and Gear Transmission Unit 20>

[0043] After the gear mechanism is incorporated into the gear box 28, the motor unit 10 with the flange 13 mounted on the frame 12 is inserted. When the motor unit 10 is inserted, the connection parts 282a and 282b of the gear box 28 and the coupling parts 131a and 131b of the flange 13 are aligned in the X direction and the Y direction, respectively. In addition, the storage opening 283 of the gear box 28 and the storage part 132 of the flange 13 are aligned in the X direction and the Y direction. As a result, when the motor unit 10 is inserted into the gear box 28, the coupling parts 131a and 131b of the flange 13 are respectively accommodated in the connection parts 282a and 282b of the gear box 28, and the storage part 132 of the flange 13 is accommodated in the storage opening 283 of the gear box 28. Therefore, at least a part of the outer peripheral side surface 281 of the gear box 28, that is, the inner peripheral side surface of the end area 285, faces the side surface 134 of the flange 13.

[0044] After the motor unit 10 is inserted into the gear box 28, the fixing member 30 is installed. In this case, the end 32 of the fixing member 30 is grasped using a tool or the like, and the fixing member 30 is expanded. That is, due to the external force, the diameter of the annular portion 31 of the fixing member 30 becomes larger than the outer diameter of the frame 12 of the motor unit 10 or the outer diameter of the gear box 28. In this state, the gear box 28 is inserted into the annular portion 31 of the fixing member 30, and when the position of the accommodating recesses 135 and 284 in the Z direction is roughly consistent with the position of the fixing member 30, the fixing member 30 is removed from the tool. As a result, the annular portion 31 of the fixing member 30 is accommodated in the accommodating recesses 135 and 284, and the end 32 is accommodated in the storage portion 132. That is, the annular portion 31 is arranged across the outer peripheral side surface 281 of the gear box 28 and the coupling portion 131. As a result, at least a portion of the outer peripheral side surface 281 of the gear case 28 , that is, the end region 285 is pressed against the side surface 134 of the flange 13 by the fixing member 30 , and the flange 13 and the gear case 28 are fixed.

[0045] Through the above steps, the motor unit 10 and the gear transmission unit 20 are assembled, and the geared motor 1 is assembled. As described above, since the fixing member 30 is accommodated in the accommodating recesses 135 and 284, the gear transmission unit 20 can be prevented from moving relative to the motor unit 10 in the Z direction, and the motor unit 10 and the gear transmission unit 20 can be fixed.

[0046] According to the above-described embodiment, at least one of the following effects can be obtained.

[0047] (1) A plurality of coupling portions 131 protruding radially outward are provided on the side surface 134 of the flange 13 of the geared motor 1, and a plurality of connecting portions 282 for accommodating the coupling portions 131 are provided on the outer peripheral side surface 281 of the gear case 28. The fixing member 30 includes an annular portion 31 formed in a shape along the circumferential direction of the surface 136 of the plurality of coupling portions 131 provided on the flange 13 and the outer peripheral side surface 281 of the gear case 28. The annular portion 31 is arranged across the outer peripheral side surface 281 of the gear case 28 and the flange 13, and the end region 285 of the gear case 28 is pressed against the side surface 134 of the flange 13, thereby fixing the flange 13 and the gear case 28. Thus, the motor unit 10 and the gear transmission unit 20 can be assembled without deforming the gear case 28. As a result, a high-strength material can be used for the gear case 28, and a high-torque geared motor 1 can be provided.

[0048] By using the fixing member 30, compared with the case where the motor unit 10 and the gear transmission unit 20 are screwed together, the increase in the number of parts due to the use of screws can be suppressed, thereby suppressing the increase in the size of the gear transmission motor 1 due to the increase in the number of parts. In addition, the increase in man-hours for the use of special tools for assembling screws and the management of the tightening torque of the screws can be suppressed. In particular, when connecting the motor unit 10 and the gear transmission unit 20, it is not necessary to perform the interaxial adjustment between the central axis of the gear mechanism in the gear box 28 and the rotating shaft 11 while considering the backlash, etc., and the connection operation can be simplified.

[0049] In addition, when assembling the geared motor 1, it is not necessary to weld and fix the components made of metal materials, so the manufacturing process can be simplified. As a result, the manufacturing process of the geared motor 1 can be simplified, which can help reduce the manufacturing cost of the geared motor 1.

[0050] (2) Grooves along the circumferential direction of the gear box 28, namely, receiving recesses 135 and 284, are formed on the surface 136 of the coupling portion 131 and the outer peripheral side surface 281 of the gear box 28. The annular portion 31 of the fixing member 30 is received in the receiving recesses 135 and 284. Thus, the fixing member 30 can be prevented from falling off, and the flange 13 and the gear box 28 can be maintained in a connected state.

[0051] (3) The connection portion 282 is a notch portion formed by cutting away a portion of the end portion of the outer peripheral side surface 281 of the gear box 28 on the side facing the motor unit 10. Thus, the coupling portion 131 of the flange 13 can be accommodated in the connection portion 282 without deforming the gear box 28. As a result, a high-strength material can be used for the gear box 28, and a high-torque geared motor 1 can be realized.

[0052] <Modification>

[0053] In the gear transmission motor of the modified example, the coupling portion 131 of the flange 13 and the connecting portion 282 of the gear box 28 are different from those in the embodiment, and the motor portion 10 and the gear transmission portion 20 are connected by a so-called snap-fit ​​structure. The following mainly describes the points that are different from the embodiment. The points not specifically described are the same as those in the embodiment.

[0054] Specifically, a protrusion protruding radially outward is formed on the joint portion 131 of the flange 13. The protrusion is formed with an inclined surface protruding radially outward at the end portion (motor portion side end) on the Z direction - side compared to the end portion (gear box side end) on the Z direction + side. The same accommodating recess 135 as in the embodiment is formed on the inclined surface of the protrusion.

[0055] The connection portion 282 of the gear case 28 is an opening formed in the outer peripheral side surface 281 of the gear case 28. However, the Z-side side wall surface of the connection portion 282 and the Z-side end of the outer peripheral side surface 281 are separated by a predetermined distance in the Z direction.

[0056] When the motor unit 10 and the gear box 28 are connected, the motor unit 10 is pushed into the gear box 28. At this time, the end of the gear box 28 on the - side in the Z direction slides on the inclined surface of the protrusion formed on the joint 131 of the flange 13. Since the gear box 28 is formed of a metal material and the flange 13 is formed of a resin material, the protrusion is inclined in a direction approaching the rotating shaft 11 and the output shaft 21 according to the sliding of the joint 131.

[0057] When the motor unit 10 is further pressed in and the end of the protrusion on the - side in the Z direction reaches a position closer to the + side in the Z direction than the side wall surface on the - side in the Z direction of the connecting portion 282, the protrusion returns to its original shape under the action of the elastic force. As a result, the protrusion is accommodated in the connecting portion 282. That is, the protrusion protruding outward from the coupling portion 131 engages with the connecting portion 282 serving as the opening portion. As a result, the motor unit 10 is mounted on the gear box 28. After the motor unit 10 is mounted on the gear box 28, the fixing member 30 is accommodated in the accommodating recesses 135, 284, similarly to the embodiment.

[0058] According to the above-mentioned modification example, it is possible to obtain the same effects as the effects (1) and (2) obtained by the embodiment.

[0059] Although various embodiments and modifications have been described above, the present invention is not limited to these contents, and other aspects that can be considered within the scope of the technical concept of the present invention are also included in the scope of the present invention.

[0060] In the above-mentioned embodiment, the fixing member 30 is accommodated in the accommodating recesses 135, 284 which serve as grooves. However, the fixing member 30 is not limited to being accommodated in the grooves. For example, at the position where the accommodating recesses 135, 284 are formed, two protrusions protruding outward may be formed along the outer peripheral side surface 281 and the surface 136 instead of the grooves. The two protrusions are formed at different positions in the Z direction. One protrusion and the other protrusion are formed at a distance substantially equal to the width (length in the Z direction) of the annular portion 31 of the fixing member 30 in the Z direction. The fixing member 30 can be accommodated in the area sandwiched by the two protrusions.

Claims

1. A gear transmission motor, wherein: have: A motor portion having a rotating shaft; a gear transmission unit including an output shaft to which the rotational force of the rotating shaft is transmitted and a cylindrical gear box rotatably accommodating the output shaft; a cylindrical flange disposed between the motor portion and the gear transmission portion; and A fixing member, fixing the flange and the gear box, A plurality of coupling portions protruding radially outward are provided on the side surface of the flange. A plurality of connection parts for accommodating the coupling parts are provided on the outer peripheral side of the gear box. The fixing member has an annular portion formed in a shape along the surface of the coupling portion and the circumferential direction of the outer peripheral side surface of the gear case. The annular portion is arranged across the outer peripheral side surface of the gear case and the coupling portion, and presses at least a portion of the outer peripheral side surface of the gear case against the side surface of the flange, thereby fixing the flange and the gear case.

2. The geared motor according to claim 1, wherein: A groove portion along the circumferential direction of the gear case is formed on the surface of the coupling portion and the outer peripheral side surface of the gear case, The annular portion is accommodated in the groove portion.

3. The geared motor according to claim 2, wherein: The connection portion is a notch portion formed by cutting away a portion of an end portion of the outer peripheral side surface of the gear case on a side facing the motor portion.

4. An electronic device, wherein: A geared motor according to any one of claims 1 to 3.

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