Motor and connection structure between motor and connected component

Abstract

The present invention provides a motor, which comprises a bracket, a terminal arranged on the bracket and a frame for fixing the bracket, wherein the terminal can be electrically connected to the outside, the bracket comprises an outer peripheral surface with an opening, and a part of the terminal is arranged inside the opening.

Description

Technical Field

[0001] The present invention relates to a motor and a connection structure between a motor and a connected component, and in particular to a motor having a terminal connected to a terminal of a connected component and a connection structure between the motor and the connected component. Background Art

[0002] There is a motor with a female terminal structure in which a terminal for supplying power is accommodated inside a bracket.

[0003] Patent Document 1 listed below discloses a motor of a female terminal structure in which a resistor such as a PTC thermistor is disposed inside a bracket.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2006-166646

[0005] However, in a motor with a female terminal structure, the shape and size of the terminal are preferably set in a manner that increases the elasticity of the terminal, so it is difficult to miniaturize the motor. In order to miniaturize the motor, the terminals in the motor need to be arranged in a narrow space, which will damage the elasticity of the terminals. If the elasticity of the terminals is small, the terminals are easily plastically deformed and it is difficult to use the motor, thereby making it difficult to install the motor on other connected components. If the volume, size, and thickness of the bracket formed by resin are reduced in order to expand the space for terminal arrangement, the bracket is easily damaged, and there is a situation where it is difficult to use the motor. Summary of the invention

[0006] The present invention has been made to solve such a problem, and an object of the present invention is to provide a motor that is small and easy to use, and a connection structure between the motor and a connected member.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a motor is provided, which comprises a bracket, a terminal arranged on the bracket and a frame for fixing the bracket, the terminal can be electrically connected to the outside, the bracket comprises an outer peripheral surface with an opening portion, and a part of the terminal is arranged on the inner side of the opening portion.

[0008] Preferably, the terminal includes a contact portion disposed outside the bracket, and the contact portion is displaceable from the opening toward the inside of the bracket.

[0009] Preferably, the electronic device includes a pair of terminals including a terminal and an electronic component provided on a bracket, and the electronic component is provided between contact portions of the pair of terminals.

[0010] Preferably, the electronic component is a resistor, and the longitudinal direction of the electronic component is a direction from one terminal of the pair of terminals toward the other terminal.

[0011] According to another aspect of the present invention, there is provided a connection structure between a motor and a connected component, comprising the motor according to any one of claims 1 to 4 and a connected component having a terminal, wherein the terminal of the connected component is connected to the terminal of the motor.

[0012] Preferably, the connected member includes a pair of terminals including the terminal, and inner surfaces of the pair of terminals of the connected member are in contact with the terminal of the motor.

[0013] According to these inventions, it is possible to provide a motor that is small and easy to use, and a connection structure between the motor and a connected member. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a cross-sectional view showing a motor according to an embodiment of the present invention.

[0015] Figure 2 It is schematically indicated Figure 1 A cross-section diagram of the AA line.

[0016] Figure 3 This is the rear view of the motor.

[0017] Figure 4 This is a front view showing a bracket to which the brush unit is mounted.

[0018] Figure 5 It is a diagram showing a cross section of a bracket and a brush unit perpendicular to the rotation axis.

[0019] Figure 6 This is a diagram for explaining the brush unit in a state where a connected component is mounted. DETAILED DESCRIPTION

[0020] Hereinafter, a motor according to an embodiment of the present invention will be described.

[0021] In the following description, the direction parallel to the rotation axis of the motor is often referred to as the rotation axis direction. In addition, the rotation axis direction is often referred to as the front-to-back direction (when viewed from the frame of the motor, the direction in which the bracket is provided is the rear direction). In addition, a specific direction (the details will be described later) in the direction perpendicular to the rotation axis of the motor (radial direction) is often referred to as the up-down direction, and the direction perpendicular to the front-to-back direction and the up-down direction is referred to as the left-right direction. The "front-to-back", "up-down", "left-to-right", etc. mentioned here are appropriately adopted methods of expression for the case where only the motor is concerned, and there is no limitation on the direction of the device on which the motor is mounted or the posture of using the motor.

[0022] [Implementation Method]

[0023] Figure 1 It is a cross-sectional view showing a motor 1 according to an embodiment of the present invention. Figure 2It is schematically indicated Figure 1 A cross-section diagram of the AA line.

[0024] Figure 1 The cross section shown is Figure 2 The cross section is shown along the line BB in FIG. In addition, for the sake of explanation, some components are schematically shown (for example, the brush 29 described later is not originally located in the cross section shown along the line BB, but is shown in a state of rotating around the rotation axis of the motor 1). In the following figures, arrow A1 indicates the direction of the rotation axis, that is, the front-to-back direction. Arrow A2 indicates the left-right direction (in FIG. Figure 2 Arrow A3 indicates the up and down direction (in Figure 2 in the middle, up is the upward direction).

[0025] The motor 1 includes a frame assembly 1a and an armature assembly 1b rotatable relative to the frame assembly 1a. The motor 1 is a relatively small motor having a width of several tens of millimeters. Here, the width of the motor 1 may be, for example, the distance between a pair of planar portions 3b opposed to each other across the rotating shaft 2, the size of the motor 1 in the vertical direction or the size in the horizontal direction, or the maximum outer diameter of the motor 1.

[0026] The armature assembly 1b has a rotating shaft (shaft) 2, an armature 4 mounted on the rotating shaft 2, and a commutator 6 mounted on the rotating shaft 2. The armature 4 is mounted on the rotating shaft 2. The armature 4 has an armature core 5 having a plurality of salient poles protruding in the radial direction and a winding (not shown) wound around each salient pole. The commutator 6 is provided near one end of the rotating shaft 2. The commutator 6 has a plurality of commutator segments 7 arranged in the circumferential direction. The plurality of commutator segments 7 are electrically connected to the windings, respectively.

[0027] The frame assembly 1 a is composed of a frame 3 , a bracket 30 , a plate 40 , a magnet 50 , and the like.

[0028] The frame 3 has a front end and a rear end, and has a cylindrical shape covered by a surface that is the front end. That is, the frame 3 has a cup shape with the rear end being an opening. The rear end of the frame 3 (at Figure 1 The opening of the frame 3 (the right end in the figure) is closed by a plate 40. The armature 4, the commutator 6 and the like of the armature assembly 1b are housed in a housing composed of the frame 3 and the plate 40.

[0029] The frame 3 is formed using a magnetic material. Figure 2As shown, the frame 3 has a plurality of corners 3c and a plane portion 3b located between two adjacent corners 3c. Specifically, the frame 3 has an outer shape having four plane portions 3b and four corners 3c, respectively. Two plane portions 3b adjacent in the circumferential direction are connected to each other via a corner 3c. One of the two plane portions 3b adjacent in the circumferential direction is approximately perpendicular to the other. The corner 3c has a curved shape (arc shape). The frame 3 is approximately square in a cross section perpendicular to the rotating shaft 2. The frame 3 is formed in a square shape as a whole. That is, the motor 1 is a small square motor. In addition, in the following description, the up-down direction is a direction perpendicular to a pair of plane portions 3b existing across the rotating shaft 2, and the left-right direction is a direction perpendicular to another pair of plane portions 3b existing across the rotating shaft 2.

[0030] return Figure 1 The bracket 30 is arranged inside the plate 40. The bracket 30 is provided on the frame 3. As described later, the bracket 30 has two brush units 11 and 21 (a right brush unit 11 and a left brush unit 21).

[0031] The rotating shaft 2 penetrates the front surface of the frame 3. That is, the front end of the rotating shaft 2 protrudes from the frame 3 to the outside of the frame 3, and the rear end of the rotating shaft 2 protrudes from the plate 40 to the outside of the frame 3. A bearing 8 is held in the center of the front surface of the frame 3. In addition, a bearing 9 is held in the center of the plate 40. The rotating shaft 2 is supported by the bearings 8 and 9 at two locations so as to be rotatable relative to the frame 3.

[0032] like Figure 2 As shown, in this embodiment, a ring-shaped magnet 50 is provided. In other words, the magnet 50 is cylindrical. The magnet 50 is arranged on the inner side of the frame 3. The frame assembly 1a has a cross-sectional structure in which the outer peripheral surface 50a of the magnet 50 is surrounded by the frame 3. The outer peripheral surface of the frame 3 becomes the outer peripheral surface of the motor 1. In addition, a plurality of magnets each having a magnetic pole element may be used.

[0033] The frame 3 has a substantially uniform thickness. That is, the inner surface 3a of the frame 3 is formed into a square shape by connecting the flat portions of the plurality of plane portions 3b and the curved portions of the corner portions 3c.

[0034] The magnet 50 is, for example, a bonded magnet formed using a known rare earth material and a known resin material. The magnet 50 is not limited to a bonded magnet, and may be, for example, a sintered magnet.

[0035] The magnet 50 has magnetic pole elements 61 (N pole 61a, S pole 61b, N pole 61c, S pole 61d). That is, the magnet 50 has the same number of magnetic pole elements 61 as the number of corners 3c of the motor 1. The magnetic pole elements 61 are arranged so that the polarities are staggered in the circumferential direction. The four magnetic pole elements 61 are arranged at the four corners 3c of the frame 3 so that the magnetic pole elements 61 are opposite to each other.

[0036] The magnet 50 has an outer peripheral surface 50a having an arc shape along the inner surface 3a of the frame 3 at the corner 3c. The magnet 50 also has a cylindrical inner peripheral surface 50b. A small air gap is provided between the inner peripheral surface 50b of the magnet 50 and the armature core 5.

[0037] In the present embodiment, the magnet 50 is fixed to the frame 3 using an adhesive or the like. In the process of assembling the motor 1, the magnet 50 is received inside the frame 3 from the opening on the rear side of the frame 3. Then, an adhesive is arranged between the end portion on the rear side of the magnet 50 and the inner surface 3a of the frame 3, and the magnet 50 is fixed to the frame 3. Then, the armature assembly 1b is mounted on the frame 3, and the bracket 30 and the plate 40 are mounted on the frame 3, thereby assembling the motor 1.

[0038] Figure 3 is a rear view of the motor 1.

[0039] exist Figure 3 In FIG. 1 , the dotted lines represent hidden lines of the frame 3 .

[0040] like Figure 3 As shown in the figure, when the motor 1 is viewed from the back side, a part of the bracket 30 is exposed to the back side at the upper part of the motor 1, and the plate 40 is exposed to the back side at a part other than the upper part of the motor 1. At the upper part of the bracket 30, a surface 39 extending to the left and right is provided radially outward from the outer peripheral part of the frame 3 when viewed from the rotation axis direction.

[0041] Figure 4 It is a front view showing the bracket 30 to which the brush units 11 and 21 are mounted.

[0042] exist Figure 4 , the brush units 11 and 21 are shown in a state where the commutator 6 is mounted, and the position of the commutator 6 is indicated by a two-dot chain line.

[0043] The bracket 30 is arranged so as to block the opening of the frame 3 of the motor 1, and a part of the bracket 30 is accommodated in the frame 3. That is, the bracket 30 is fixed to the frame 3. The bracket 30 has a first extension portion 31 and a second extension portion 32 extending from the rear side (armature side) of the bracket 30 toward the front (outside the frame 2). In other words, the portion of the bracket 30 other than the first extension portion 31 and the second extension portion 32 is recessed toward the rear of the front end surface of the bracket 30, that is, the front end surface of the first extension portion 31 and the front end surface of the second extension portion 32. The brush portions 11 and 21 are arranged in the area recessed toward the rear of the front end surface. The rear side of the bracket 30 is blocked by a surface perpendicular to the direction of the rotating shaft, and a through hole 36 for the rotating shaft 2 to pass through is formed on the surface. The through hole 36 has an elliptical shape (Oval shape) in which the vertical direction is the longitudinal direction.

[0044] In the bracket 30, the first extension portion 31 constitutes the outer peripheral surface of the right side, the lower side, and the left side of the bracket 30. The first extension portion 31 has a curved shape extending along the outer periphery of the frame 3, and further has two ends. In addition, the second extension portion 32 constitutes the outer peripheral surface of the upper side of the bracket 30. The second extension portion 32 has a linear shape extending along the outer periphery of the frame 3, and has two ends. The first extension portion 31 and the second extension portion 32 form an annular shape having two gaps described later. The gap described later is formed between one end of the first extension portion 31 and one end of the second extension portion 32, and between the other end of the first extension portion 31 and the other end of the second extension portion 32.

[0045] The bracket 30 has an outer peripheral surface having openings 34 and 35. That is, there is a gap between the outer peripheral surface of the first extension part 31 and the outer peripheral surface of the second extension part 31, and the gap becomes the openings 34 and 35 of the outer peripheral surface. In other words, at the upper right part (one of the four corners) of the bracket 30, the upper end 31b (one of the two ends) of the outer peripheral surface of the first extension part 31 and the right end 32b (one of the two ends) of the outer peripheral surface of the second extension part 32 are separated from each other. The opening 34 provided on the right side of the outer peripheral surface of the bracket 30 is formed between the upper end 31b and the right end 32b. In addition, at the upper left part of the bracket 30, the upper end 31c of the outer peripheral surface of the first extension part 31 and the left end 32c of the outer peripheral surface of the second extension part 32 are separated from each other. The opening 34 provided on the left side of the outer peripheral surface of the bracket 30 is formed between the upper end 31c and the left end 32c.

[0046] The right brush unit 11 includes a brush 19 that contacts the commutator 6, a first terminal member (an example of a terminal) 14 having a contact portion 12 that can be electrically connected to the outside of the motor 1, a second terminal member 16, and an arm member 18 that electrically connects the second terminal member 16 to the brush 19. The first terminal member 14 and the second terminal member 16 are electrically connected via a resistor (an example of an electronic component) 60 provided on the bracket 30 as described later. The arm member 18 elastically deforms, so that the brush 19 is pushed against the outer peripheral surface of the commutator 6.

[0047] In the present embodiment, the resistor 60 is, for example, a plate-shaped PTC thermistor. When the temperature of the motor 1 rises, the resistor 60 cuts off the power supply to the motor 1, so that the motor 1 can be stopped.

[0048] The left brush unit 21 includes a brush 29 that contacts the commutator 6, a third terminal member (an example of a terminal) 26 having a contact portion 22 that can be electrically connected to the outside of the motor 1, and an arm member 28 that electrically connects the third terminal member 26 to the brush 29. The arm member 28 is elastically deformed so that the brush 29 is pushed against the outer peripheral surface of the commutator 6. In addition, in the present embodiment, the third terminal member 26 is configured to connect the two members, the member on the contact portion 22 side and the member connected to one side of the arm member 28, to each other, but the present invention is not limited thereto.

[0049] Each brush unit 11, 21 is provided on a bracket 30. The first terminal member 14, the second terminal member 16, and the third terminal member 26 are held by the bracket 30 by being sandwiched by grooves 31g, 32g formed in the first extension portion 31, and the second extension portion 32. Thus, the brush units 11, 21 are held by the bracket 30.

[0050] Specifically, the first extension 31 holds the joint 17 between the second terminal member 16 and the arm member 18 and the joint 27 between the third terminal member 26 and the arm member 28. As a result, the base ends of the arm members 18 and 28 (the ends on the side away from the parts where the brushes 19 and 29 are installed) are firmly supported by the bracket 30, so that the brushes 19 and 29 are stably pushed against the commutator 6.

[0051] In addition, the second extension portion 32 holds the portion of the first terminal member 14 and the third terminal member 26 on the contact portion 22 side. In addition, the second extension portion 32 holds the resistor 60 in a state of being clamped between the first terminal member 14 and the second terminal member 16. Thus, the right brush portion 11 is held on the bracket 30 in a state of being electrically connected from the contact portion 12 of the first terminal member to the brush 19. A groove portion 32g recessed from the front to the rear is provided in the second extension portion 32. The first terminal member 14 and the third terminal member 26 are held on the bracket 30 by being inserted into the groove portion 32g. In addition, a stopper portion 37 formed by a part of the second extension portion 32 is formed at a portion radially inside the openings 34 and 35 of the bracket 30. The stopper portion 37 is configured to support the first terminal member 14 and the third terminal member 26 in a manner that does not make the displacement amount of the first terminal member 14 and the third terminal member 26 too large when the first terminal member 14 and the third terminal member 26 contact with the external terminal as described later and are displaced. This prevents the first terminal member 14 and the third terminal member 26 from being plastically deformed.

[0052] In the present embodiment, the resistor 60 is disposed between the contact portions 12 and 22 of the first terminal member 14 and the third terminal member 26, which are a pair of left and right terminals. The resistor 60 is configured in such a manner that the length direction becomes the left-right direction. That is, the length direction of the resistor 60 becomes the direction from one of the pair of first terminal members 14 and the third terminal member 26 toward the other. The resistor 60 is arranged near the upper surface of the motor 1 in a posture in which the length direction is substantially parallel to the upper surface of the motor 1. Thus, a relatively wide space for mounting the resistor 60 can be ensured inside the motor 1. Therefore, a relatively small motor 1 can be manufactured that can flow a relatively large current and can rotate with a high torque.

[0053] The first terminal member 14 is in contact with the upper surface of the resistor 60, and the second terminal member 16 is in contact with the lower surface of the resistor 60. Thus, the resistor 60 is inserted between the paths through which the current flows from the contact portion 12 to the brush 19.

[0054] Figure 5 The figure shows a cross section of the bracket 30 and the brush units 11 and 21 perpendicular to the rotating shaft 2 . Figure 6 The drawings are for explaining the brush units 11 and 21 in a state where the connected member 80 is mounted.

[0055] exist Figure 5 as well as Figure 6 In FIG. 1 , the brushes 19 and 29 are shown in a front view.

[0056] In the left and right brush parts 11 and 21, the contact parts 12 and 22 are arranged on the outside of the bracket 30. A part of the first terminal member 14 passes through the inner side of the opening part 34, and the contact part 12 is located at a position closer to the outside than the opening part 34. In addition, a part of the third terminal member 26 passes through the inner side of the opening part 35, and the contact part 22 is located at a position closer to the outside than the opening part 35. That is, a part of the first terminal member 14 and a part of the third terminal member 26 are arranged on the inner side of the opening parts 34 and 35. Such a configuration of the contact parts 12 and 22 can also be as follows. That is, a part of the first terminal member 14 and a part of the third terminal member 26 exist between the outer peripheral wall of the first extension part 31 and the outer peripheral wall of the second extension part 32 arranged in the circumferential direction of the bracket 30.

[0057] In addition, if Figure 4 As shown, the contact portions 12 and 22 are configured not to be exposed behind the motor 1 when viewed from the axial direction. In other words, the contact portions 12 and 22 are located radially inside each of the left and right surfaces 39. Thus, when the motor 1 is used, other components can be prevented from accidentally contacting the contact portions 12 and 22, thereby preventing the motor 1 from being damaged.

[0058] In the motor 1 configured in this manner, a connected component 80 having two terminals 81 formed as a pair on the left and right is mounted when viewed from the top to the bottom of the motor 1. Figure 5 as well as Figure 6 In FIG. 8 , the connected component 80 is indicated by a double-dashed line. Figure 6 As shown, the two terminals 81 are in contact with the contact portions 12 , 22 , whereby the connected component 80 is electrically connected to the motor 1 .

[0059] If the terminal 81 moves downward from top to bottom and contacts the contact portions 12 and 22, Figure 6 As shown, the contact portions 12 and 22 are displaced from the openings 34 and 35 toward the inside of the bracket 30, respectively. At this time, the first terminal member 14 and the third terminal member 26 are elastically deformed, respectively, and the contact portions 12 and 22 are pushed against the side of the terminal 81. Therefore, even if vibration is applied to the motor 1 and the connected component 80, the contact between the terminal 81 and the contact portions 12 and 22 can be reliably maintained. In the connected component 80, a pair of terminals 81 are arranged side by side on the left and right. The interval between the surfaces of the two opposing terminals 81 (hereinafter often referred to as the inner surfaces) is slightly wider than the left and right width of the second extension portion 32, and narrower than the left and right width of the motor 1. When the connected component 80 is connected to the motor 1, the contact portions 12 and 22 can respectively contact the inner surfaces of each terminal 81.

[0060] In the motor 1 according to the present embodiment, as described above, the terminal 81 of the connected member 80 is connected to the contact portion 12 of the first terminal member 14 and the contact portion 22 of the third terminal member 26. The connection structure between the motor 1 and the connected member 80 can form a compact and easy-to-use motor 1.

[0061] In the motor 1 involved in this embodiment, the interval between the left and right contact parts 12 and 22 can be enlarged. Therefore, in a relatively small motor, a relatively wide space can be ensured for the first terminal member 14 and the third terminal member 26 to elastically deform and displace the contact parts 12 and 22. In other words, the first terminal member 14 and the third terminal member 26 can be slowly deformed to make the contact parts 12 and 22 contact with the terminal 81, so even when the terminal 81 is configured to contact the contact parts 12 and 22 in an inclined direction, the first terminal member 14 and the third terminal member 26 can be prevented from plastic deformation. In addition, the size of the first extension part 31 and the second extension part 32 of the bracket 30 made of resin can be ensured to be relatively large. Therefore, the strength of the bracket 30 can be ensured, so that the damage of the motor 1 can be prevented. The motor 1 can be easily assembled and the assembled motor 1 can be used.

[0062] [other]

[0063] The motor may be configured by partially combining the respective characteristic features of the above-mentioned embodiments. In the above-mentioned embodiments, some components may not be provided, or some components may be configured in other ways.

[0064] The outer peripheral shape of the motor may not be a square as in the above embodiment. For example, the above-mentioned terminal component structure may be adopted in a small motor having a so-called elliptical cross-section (an ellipse formed by connecting two left and right arcs with two straight lines), or in a small motor having a circular cross-section. In the case where the outer peripheral shape of the motor has an elliptical cross-section, a magnet having a planar shape of two arcs is fixed to the frame, and in the case where the outer peripheral shape of the motor has a circular cross-section, a magnet having a circular planar shape is fixed to the frame.

[0065] The motor configured as described above can be used for various purposes, for example, it can be used for electronic equipment or can be mounted on various vehicles.

[0066] The above embodiments are intended to be illustrative in all respects and are not intended to limit the present invention. The scope of the present invention is not limited by the above description but is indicated by the claims, and the present invention also includes all modifications within the meaning and scope equivalent to the claims.

[0067] This application claims priority from Japanese patent application (Japanese Patent Application No. 2018-138574) filed on July 24, 2018, the contents of which are incorporated herein by reference.

[0068] Description of Reference Numerals

[0069] 1…motor; 1a…frame assembly; 1b…armature assembly; 2…rotating shaft; 3…frame; 6…commutator; 11, 21…brush portion; 12, 22…contact portion; 14…first terminal member (an example of a terminal); 26…third terminal member (an example of a terminal); 30…bracket; 34, 35…opening portion; 60…resistor (an example of an electronic component); 80…connected member; 81…terminal.

Claims

1. A motor, wherein: A bracket, a terminal arranged on the bracket, and a frame for fixing the bracket, The terminal can be electrically connected to the outside, The bracket includes a corner portion in the circumferential direction, an outer peripheral surface having an opening, and a first extending portion and a second extending portion constituting the outer peripheral surface. The first extension portion has two end portions. The second extension portion has two end portions, The opening is formed at a corner of the bracket between one end of the first extension and one end of the second extension. A portion of the terminal exists between one end of the first extending portion and one end of the second extending portion arranged in the circumferential direction. A portion of the terminal passes through the inner side of the opening.

2. The motor according to claim 1, wherein: The terminal includes a contact portion disposed outside the bracket, The contact portion is displaceable from the opening portion toward an inner side of the bracket.

3. The motor according to claim 1 or 2, wherein: A pair of terminals including the terminal and an electronic component provided on the bracket, The electronic component is provided between the contact portions of the pair of terminals.

4. The motor according to claim 3, wherein: The electronic component is a resistor, The longitudinal direction of the electronic component is a direction from one terminal of the pair of terminals toward the other terminal.

5. A connection structure between a motor and a connected component, wherein: A motor according to any one of claims 1 to 4 and a connected component having a terminal, The terminals of the connected component are connected to the terminals of the motor.

6. The connection structure between a motor and a connected component according to claim 5, wherein: The connected component includes a pair of terminals including the terminal, The inner surfaces of the pair of terminals of the connected member are in contact with the terminals of the motor.

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