JP2020036471A - Motor and method of manufacturing the motor - Google Patents

Abstract

To provide a motor capable of easily fixing a supporting plate that supports a bearing so as to allow adjustment of concentricity.SOLUTION: A motor 1 comprises: a rotor 3; a stator 4; a bearing 5a; a holding member 2b; and a supporting plate 6a. The rotor 3 has a shaft 31. The bearing 5a rotatably supports the shaft 31. The holding member 2b holds the bearing 5a. The supporting plate 6a supports the bearing 5a so as to allow adjustment of concentricity. The holding member 2b has a projection part 7 extending toward the supporting plate 6a. The projection part 7 includes a first projection part 71 and a second projection part 72. The first projection part 71 extends in an axial direction. The second projection part 72 extends from the first projection part 71 in a direction crossing the axial direction. The supporting plate 6a has a projection part arrangement hole 8 penetrating the support plate 6a in the axial direction. The first projection part 71 is arranged in the projection part arrangement hole 8, and the second projection part 72 comes into contact with a contact surface 10 of the support plate 6a in the axial direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a motor and a method for manufacturing the motor.

  Rotor brackets for small motors are known. The rotor brackets are provided at both ends of the rotor of the motor.

  For example, the rotor bracket of Patent Document 1 includes a top plate, a shaft sleeve, and a fastening ring. A storage port is formed in the top plate. The shaft sleeve is arranged in the storage opening. The fastening ring is arranged so that the shaft sleeve fits in and is fixed to the top plate, for example, by riveting. A plurality of springs are formed on the tightening ring. The plurality of springs contact the outer surface of the shaft sleeve. As a result, the shaft sleeve is freely adjusted concentrically.

JP-T-2015-513891

  However, in the rotor bracket of Patent Document 1, the fastening ring is fixed by rivets. Therefore, it takes time and effort to fix the components that support the bearing so that they can be adjusted concentrically.

  The present invention has been made in view of the above problems. An object of the present invention is to provide a motor capable of easily fixing a support plate, which is a component for supporting a bearing concentrically, and a method of manufacturing the motor.

  An exemplary motor of the present invention includes a rotor, a stator, a bearing, a holding member, and a support plate. The rotor has a shaft extending along a central axis. The stator is radially opposed to the rotor. The bearing rotatably supports the shaft. The holding member holds the bearing. The support plate faces the surface of the holding member on the side where the stator is arranged, and supports the bearing concentrically and freely. The support plate has a bearing arrangement hole and a contact portion. The bearing arrangement hole penetrates in the axial direction. The bearing is arranged in the bearing arrangement hole. The contact portion extends from an edge of the bearing arrangement hole and contacts an outer surface of the bearing. One of the support plate and the holding member has a protrusion extending toward the other of the support plate and the holding member. The protrusion has a first protrusion and a second protrusion. The first protrusion extends in the axial direction. The second protrusion extends from the first protrusion in a direction intersecting the axial direction. The other of the support plate and the holding member has a protrusion arrangement hole. The protruding portion arrangement hole penetrates in the axial direction and is located radially outward with respect to the bearing arrangement hole. The first protrusion is arranged in the protrusion arrangement hole. The second protrusion is in axial contact with the other contact surface of the support plate and the holding member.

  An exemplary method for manufacturing a motor according to the present invention includes the steps of: placing the bearing on the holding member; contacting the contact portion with the bearing to dispose the bearing in the bearing disposition hole; The method includes a step of inserting the protrusion into the hole, and a step of rotating at least one of the support plate and the holding member in a circumferential direction to bring the second protrusion into contact with the contact surface.

  According to the exemplary present invention, it is possible to easily fix the support plate that supports the bearing so that the bearing can be adjusted concentrically.

FIG. 1 is a diagram illustrating an appearance of a motor according to a first embodiment of the present invention. FIG. 2 is a sectional view showing the motor according to the first embodiment of the present invention. FIG. 3 is a diagram illustrating a part of the configuration of the motor according to the first embodiment of the present invention. FIG. 4 is a diagram illustrating a part of the configuration of the motor according to the first embodiment of the present invention. FIG. 5 is an enlarged view showing a part of the configuration of the motor according to the first embodiment of the present invention. FIG. 6 is a sectional view showing a part of the configuration of the motor according to the first embodiment of the present invention. FIG. 7 is a diagram illustrating the first support plate according to the first embodiment of the present invention. FIG. 8 is an enlarged view showing a part of the first support plate according to the first embodiment of the present invention. FIG. 9 is an enlarged view showing a part of the configuration of the motor according to the first embodiment of the present invention. FIG. 10 is a flowchart illustrating a motor manufacturing method according to the first embodiment of the present invention. FIG. 11 is a diagram illustrating a part of the configuration of the motor according to the first embodiment of the present invention. FIG. 12 is a diagram illustrating the second support plate according to the first embodiment of the present invention. FIG. 13 is a diagram illustrating a part of the configuration of the motor according to the first embodiment of the present invention. FIG. 14 is an enlarged view showing a part of the configuration of the motor according to the second embodiment of the present invention. FIG. 15 is a diagram illustrating a part of the configuration of the motor according to the third embodiment of the present invention. FIG. 16 is an enlarged view showing a part of the configuration of the motor according to the third embodiment of the present invention. FIG. 17 is a diagram showing a cross section taken along line XVII-XVII shown in FIG. FIG. 18 is a diagram illustrating a part of the configuration of the motor according to the third embodiment of the present invention. FIG. 19 is a diagram showing a cross section along the line XIX-XIX shown in FIG. FIG. 20 is a diagram illustrating a protrusion and a protrusion arrangement hole according to another embodiment of the present invention. FIG. 21 is a diagram showing a protrusion and a protrusion arrangement hole according to still another embodiment of the present invention.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. However, for portions where the description is duplicated, the description may be appropriately omitted. In the drawings, the same or corresponding portions are denoted by the same reference characters, and description thereof will not be repeated.

  In this specification, the direction of the central axis CA (see FIG. 1) of the motor 1 will be described as a vertical direction for convenience. In this specification, the vertical direction is defined for convenience of description, and is not intended to coincide with the vertical direction. Further, a direction parallel to the direction of the central axis CA is described as “axial direction”, and a radial direction and a circumferential direction about the central axis CA are described as “radial direction” and “circumferential direction”. In this specification, the “parallel direction” includes a substantially parallel direction, and the “perpendicular direction” includes a substantially perpendicular direction.

[Embodiment 1]
First, a motor 1 according to the present embodiment will be described with reference to FIGS. FIG. 1 is a diagram illustrating an appearance of a motor 1 according to the present embodiment. As shown in FIG. 1, the motor 1 includes a housing 2. The housing 2 of the present embodiment has an upper housing 2a. The upper housing 2a has an opening on the lower side. The upper housing 2a has a housing space inside.

  FIG. 2 is a cross-sectional view illustrating the motor 1 according to the present embodiment. As shown in FIG. 2, the housing 2 of the present embodiment further includes a lower housing 2b. The lower housing 2b covers the lower opening of the upper housing 2a.

  As shown in FIG. 2, the motor 1 further includes a rotor 3 and a stator 4. The rotor 3 and the stator 4 are housed inside the housing 2. More specifically, the rotor 3 and the stator 4 of the present embodiment are housed in a housing space of the upper housing 2a.

  As shown in FIG. 2, the rotor 3 includes a shaft 31, a rotor yoke 32, a spacer 33, and a magnet. The shaft 31 extends along the central axis CA. The shaft 31 and the rotor yoke 32 are fixed to the spacer 33 by insert molding. The rotor yoke 32 is cylindrical, and holds the magnet 34 on the outer peripheral surface. In the present embodiment, the magnet 34 is fixed to the rotor yoke 32 with an adhesive. As the rotor 3 rotates, the shaft 31 rotates. The shaft 31 protrudes from the housing 2. In the present embodiment, the shaft 31 protrudes upward from the upper housing 2a.

  The stator 4 is annular with the center axis CA as the center, and faces the rotor 3 in the radial direction. The stator 4 has a stator core 41, an insulator 42, and a plurality of coils 43. The stator core 41 is, for example, an iron core member formed of a laminated steel sheet in which electromagnetic steel sheets are laminated in the axial direction. The stator core 41 faces the magnet 34 of the rotor 3 in the radial direction. The insulator 42 is, for example, an insulating member using a resin material. The insulator 42 covers at least a part of the stator core 41. Each of the plurality of coils 43 is formed of a conductive wire (not shown) wound around the stator core 41 via the insulator 42.

  When a drive current is applied to the coil 43 from an external power supply (not shown), a radial magnetic flux is generated in the stator core 41. Then, a circumferential torque is generated by the action of the magnetic flux between the stator core 41 and the magnet 34 of the rotor 3. As a result, the rotor 3 rotates about the central axis CA with respect to the stator 4.

  The motor 1 includes a bearing, a holding member, and a support plate. The bearing rotatably supports the shaft 31. The holding member holds the bearing. The support plate faces the surface of the holding member on the side where the stator 4 is arranged, and supports the bearing concentrically and freely. The bearing includes a first bearing 5a located at a lower part of the motor 1 and a second bearing 5b located at an upper part of the motor 1. The holding member includes an upper housing 2a and a lower housing 2b. The support plate includes a first support plate 6a located below the motor 1 and a second support plate 6b located above the motor 1.

  The lower structure of the motor 1 according to the present embodiment will be described with reference to FIGS. FIG. 3 is a diagram illustrating a part of the configuration of the motor 1 according to the present embodiment. Specifically, FIG. 3 is a view of the vicinity of the lower housing 2b as viewed obliquely from above.

  As shown in FIG. 3, the motor 1 further includes a first bearing 5a and a first support plate 6a in addition to the lower housing 2b. The first bearing 5a and the first support plate 6a are arranged in the lower housing 2b and housed inside the housing 2.

  The lower housing 2b is an example of a holding member, and holds the first bearing 5a. The lower housing 2b has an inner surface 21 in the axial direction. The axial inner side surface 21 is a surface on the side where the stator 4 is arranged.

  In the present embodiment, the lower housing 2b has a protrusion 7. The protrusion 7 is connected to the inner side surface 21 in the axial direction, and extends toward the first support plate 6a. In the present embodiment, the lower housing 2b has a plurality of protrusions 7. More specifically, the lower housing 2b has four protrusions 7. However, the present invention is not limited to this. The number of the protrusions 7 may be one. Alternatively, the number of the protrusions 7 may be two, three, or five or more.

  The first bearing 5a rotatably supports the shaft 31. In the present embodiment, the first bearing 5a is a sliding bearing (sleeve) containing oil.

  The first support plate 6a faces the axial inner surface 21 of the lower housing 2b. Further, the first support plate 6a supports the first bearing 5a concentrically and freely.

  More specifically, the first support plate 6a has a plurality of contact portions 61 arranged in the circumferential direction. Each of the plurality of contact portions 61 contacts the outer surface of the first bearing 5a. The first support plate 6a is formed of a plate material, and the plurality of contact portions 61 respectively apply pressure to the first bearing 5a. That is, the first support plate 6a is a leaf spring. As a result, the first bearing 5a is positioned concentrically and freely. In the present embodiment, the first support plate 6a has four contact portions 61. However, the present invention is not limited to this. The number of the contact portions 61 may be, for example, three or five or more.

  In the present embodiment, the first support plate 6a is disk-shaped, and has a plurality of projecting portion arrangement holes 8 and a contact surface 10. Each projection arrangement hole 8 penetrates the first support plate 6 a in the axial direction, and the projection 7 projects from each projection arrangement hole 8. In other words, the plurality of protrusions 7 are arranged in different protrusion arrangement holes 8 respectively. In the present embodiment, the contact surface 10 is a surface on which the stator 4 is arranged. That is, the contact surface 10 of the first support plate 6a is the upper surface of the first support plate 6a.

  FIG. 4 is a diagram illustrating a part of the configuration of the motor 1 according to the present embodiment. Specifically, FIG. 4 is a view in which the first bearing 5a and the first support plate 6a are omitted from the lower part of the motor 1 shown in FIG.

  As shown in FIG. 4, the motor 1 further includes a first porous member 9a containing oil. The first porous member 9a is disposed on the lower housing 2b. The lower housing 2b has at least one wall 22 in addition to the protrusion 7.

  The wall portion 22 of the lower housing 2b protrudes upward from the inner side surface 21 in the axial direction. In other words, the lower surface of the wall portion 22 of the lower housing 2b is connected to the inner surface 21 in the axial direction. At least one wall 22 connects at least two of the plurality of protrusions 7. The wall 22 extends in the circumferential direction. More specifically, one circumferential end of the wall 22 is connected to the other circumferential end of the protrusion 7.

  The first porous member 9a is arranged radially inside the wall 22. Further, the first porous member 9a is disposed between the lower housing 2b and the first support plate 6a. The first porous member 9a is disk-shaped, and has a central hole 91 at substantially the center. The first bearing 5a is arranged in the central hole 91. The first porous member 9a contacts the first bearing 5a and supplies oil to the first bearing 5a. Since the lower housing 2b has the wall portion 22, the first porous member 9a and the first bearing 5a can be brought into more contact with each other. As a result, oil can be efficiently supplied from the first porous member 9a to the first bearing 5a.

  The material of the first porous member 9a is not particularly limited as long as the material can contain oil. For example, the first porous member 9a can be an open-cell structure. The open-cell structure is a member having a plurality of continuous cells, a wall between adjacent cells is open, and a fluid can pass therethrough.

  According to the present embodiment, the life of the first bearing 5a can be extended by providing the motor 1 with the first porous member 9a. In other words, the life of the motor 1 can be extended.

  Specifically, the first bearing 5a contains oil. Thereby, the first bearing 5a rotatably supports the shaft 31. The oil of the first bearing 5a may leak along the shaft 31 or evaporate. As a result, the oil content of the first bearing 5a may decrease. When the oil in the first bearing 5a decreases, oil is supplied from the first porous member 9a to the first bearing 5a by surface tension. As a result, the life of the first bearing 5a can be extended as compared with a configuration in which the motor 1 does not include the first porous member 9a. When the first bearing 5a runs out of oil, the first bearing 5a cannot support the shaft 31 rotatably. Therefore, the period until the oil is exhausted from the first bearing 5a is the life of the first bearing 5a. In a configuration in which the motor 1 does not include the first porous member 9a, a period until the oil contained in the first bearing 5a runs out is the life of the first bearing 5a. On the other hand, according to the present embodiment, oil is supplied from the first porous member 9a to the first bearing 5a. Therefore, the period until the oil contained in the first porous member 9a disappears in addition to the oil contained in the first bearing 5a is the life of the first bearing 5a. Therefore, the life of the first bearing 5a can be extended.

  As shown in FIG. 4, in the present embodiment, the lower housing 2b has a plurality of walls 22. The number of the protruding portions 7 is equal to the number of the wall portions 22, and the plurality of wall portions 22 are respectively arranged between the adjacent protruding portions 7 and connect the plurality of protruding portions 7. For this reason, oil does not easily leak to the outside of the wall 22. In other words, oil does not easily leak to portions other than the first bearing 5a. Furthermore, since the first porous member 9a is disposed radially inside the wall portion 22 and between the lower housing 2b and the first support plate 6a, oil from the first porous member 9a is removed. Leakage or evaporation is suppressed. However, the lower housing 2b may have a plurality of wall portions 22 intermittently arranged along the circumferential direction. Alternatively, the lower housing 2b may have only the protrusion 7. In this case, a gap that penetrates in the radial direction is provided between the adjacent protrusions 7.

  Subsequently, the protruding portion 7 will be further described with reference to FIGS. FIG. 5 is an enlarged view showing a part of the configuration of the motor 1 according to the present embodiment. Specifically, FIG. 5 shows the protrusion 7, the first porous member 9a, and the wall 22. FIG. 6 is a sectional view showing a part of the configuration of the motor 1 according to the present embodiment. Specifically, FIG. 6 shows a cross section of the lower part of the motor 1.

  As shown in FIGS. 5 and 6, the protrusion 7 has a first protrusion 71 and a second protrusion 72. The first protrusion 71 extends in the axial direction. More specifically, the first protrusion 71 extends in the axial direction from the inner surface 21 in the axial direction. The axial length of the first protrusion 71 is equal to or greater than the thickness of the first support plate 6a.

  The second protrusion 72 extends from the first protrusion 71 in a direction intersecting the axial direction. The second projection 72 of the present embodiment extends radially outward. In addition, as shown in FIG. 6, the second protrusion 72 contacts the contact surface 10 of the first support plate 6a in the axial direction.

  Subsequently, the lower housing 2b will be further described with reference to FIG. As shown in FIG. 6, the lower housing 2b has a bottom part 23 extending in the radial direction and a cylindrical part 24 extending in the axial direction. The bottom portion 23 extends radially outward from the upper end of the tubular portion 24. The axially inner side surface 21 of the lower housing 2b is the upper surface of the bottom 23. The cylindrical portion 24 accommodates a part of the first bearing 5a. More specifically, the tubular portion 24 has a support surface 24a. The support surface 24a rotatably supports the first bearing 5a. Since the tubular portion 24 has the support surface 24a, the lower housing 2b rotatably holds the first bearing 5a.

  FIG. 7 is a diagram illustrating the first support plate 6a according to the present embodiment. As shown in FIG. 7, the first support plate 6a has a bearing arrangement hole 62 substantially at the center in addition to the plurality of protrusion arrangement holes 8. The bearing arrangement hole 62 passes through the first support plate 6a in the axial direction.

  As shown in FIGS. 6 and 7, the first bearing 5a is disposed in the bearing arrangement hole 62, and the contact portion 61 extends from the edge 62a of the bearing arrangement hole 62 toward the first bearing 5a.

  As shown in FIG. 7, the protrusion arrangement hole 8 is located radially outward with respect to the bearing arrangement hole 62. In addition, the protrusion arrangement hole 8 extends in the circumferential direction. The first protrusions 71 are arranged in different protrusion arrangement holes 8 respectively. Therefore, the protrusion 7 is located radially outward with respect to the bearing arrangement hole 62.

  Subsequently, with reference to FIGS. 7 to 9, the protruding portion arrangement hole 8 will be further described. FIG. 8 is an enlarged view showing a part of the first support plate 6a according to the present embodiment. FIG. 9 is an enlarged view showing a part of the configuration of the motor 1 according to the present embodiment.

  As shown in FIGS. 7 to 9, the projecting portion arrangement hole 8 of the present embodiment has a first hole portion 81 and a second hole portion 82. The second hole 82 is connected to the first hole 81 in the circumferential direction. The second hole 82 extends circumferentially from the circumferential end of the first hole 81.

  As shown in FIG. 9, the opening of the first hole portion 81 has a shape surrounding the outer shape of the protruding portion 7 when viewed from the axial direction. Specifically, the opening of the first hole 81 has a shape surrounding the outer shape of the second protrusion 72 when viewed from the axial direction. Specifically, the length La1 (FIG. 8) of the first hole 81 in the direction orthogonal to the radial direction is the length Lt1 of the projection 7 (second projecting portion 72) in the direction orthogonal to the radial direction (FIG. 9). Greater than. The radial length Lr1 (FIG. 8) of the first hole 81 is larger than the radial length Lt2 (FIG. 9) of the protrusion 7 (second protrusion 72).

  The circumferential length La2 (FIG. 8) of the second hole 82 is not particularly limited as long as it does not reach another protrusion arrangement hole 8 adjacent in the circumferential direction. The radial length Lr2 (FIG. 8) of the second hole 82 may be smaller than the radial length Lt2 (FIG. 9) of the protrusion 7 (second protrusion 72). In the present embodiment, the circumferential length La2 (FIG. 8) of the second hole 82 is greater than the circumferential length Lt3 (FIG. 9) of the first protrusion 71. The radial length Lr2 (FIG. 8) of the second hole 82 is larger than the radial length Lt4 (FIG. 9) of the first protrusion 71.

  Subsequently, a method for manufacturing the motor 1 according to the present embodiment will be described with reference to FIGS. FIG. 10 is a flowchart illustrating a method for manufacturing the motor 1 according to the present embodiment. Specifically, FIG. 10 shows a method of fixing the first support plate 6a to the lower housing 2b. As shown in FIG. 10, the method for manufacturing the motor 1 according to the present embodiment includes steps S1 to S4.

  First, in step S1, the first porous member 9a is disposed radially inside the wall 22 of the lower housing 2b. Note that the first porous member 9a of the present embodiment has a greater axial length than the wall portion 22.

  Next, in step S2, the first bearing 5a is placed on the lower housing 2b. Specifically, the first bearing 5a is placed on the support surface 24a of the tubular portion 24 via the central hole 91 of the first porous member 9a.

  Next, in step S3, the contact portion 61 of the first support plate 6a is brought into contact with the outer surface of the first bearing 5a to dispose the first bearing 5a in the bearing arrangement hole 62 of the first support plate 6a. The protrusion 7 is inserted into the protrusion arrangement hole 8 of the support plate 6a. Specifically, the protrusion 7 of the first support plate 6a is inserted into the first hole 81 of the protrusion arrangement hole 8.

  Next, in step S4, the first support plate 6a is rotated in the circumferential direction so that the second protrusion 72 of the protrusion 7 contacts the contact surface 10 of the first support plate 6a. Specifically, the first support plate 6a is rotated in a direction in which the second hole 82 of the protrusion arrangement hole 8 extends while pressing the first support plate 6a toward the axial inner side surface 21 of the lower housing 2b. Then, the first protrusion 71 is inserted into the second hole 82. As a result, the second protrusion 72 of the protrusion 7 contacts the contact surface 10 of the first support plate 6a, and the first support plate 6a is fixed to the lower housing 2b. Further, in the present embodiment, the axial length of the first porous member 9a is larger than the axial length of the wall portion 22. Therefore, by pressing the first support plate 6a toward the axial inner side surface 21 of the lower housing 2b, the first support plate 6a is pressed against the first porous member 9a. As a result, oil seeps out of the first porous member 9a, and the oil is more efficiently supplied to the first bearing 5a.

  Note that the axial length of the first porous member 9a may be equal to or less than the axial length of the wall 22. In the present embodiment, the first support plate 6a is rotated in the circumferential direction. However, the lower housing 2b may be rotated in the circumferential direction, or the first support plate 6a and the lower housing 2b may be opposite to each other. It may be rotated in the direction.

  The lower structure of the motor 1 according to the present embodiment has been described above. According to the present embodiment, the protrusion 7 is inserted into the protrusion arrangement hole 8, and at least one of the first support plate 6a and the lower housing 2b is rotated in the circumferential direction to contact the second protrusion 72. By bringing the first support plate 6a into contact with the surface 10, the first support plate 6a can be fixed. Therefore, the first support plate 6a can be easily fixed.

  Also, as described with reference to FIG. 3, the contact portion 61 applies pressure to the first bearing 5a. The reaction causes the contact surface 10 to apply pressure to the second protrusion 72. Since the direction in which the contact surface 10 applies pressure is opposite to the direction in which the contact portion 61 applies pressure, the first support plate 6a is more firmly fixed.

  Subsequently, with reference to FIG. 5, the protrusion 7 of the present embodiment will be further described. As shown in FIG. 5, in the present embodiment, the holding member has four protrusions 7. Specifically, the lower housing 2b has four protrusions 7. The four protrusions 7 are arranged at 90 ° intervals in the circumferential direction. Therefore, the lower housing 2b can be easily manufactured.

  Specifically, the lower housing 2b is made of resin and is manufactured using a mold. By arranging the four protrusions 7 at 90 ° intervals in the circumferential direction, the lower housing 2b can be manufactured using a mold having a slide core that moves in the same direction. Therefore, the production of the mold becomes easy. On the other hand, for example, when the six protrusions 7 are arranged at intervals of 60 ° along the circumferential direction, it is necessary to use a mold having a plurality of slide cores that move in different directions from each other. Cannot be made. Therefore, according to the present embodiment, the manufacture of the mold is facilitated, and the manufacture of the lower housing 2b is facilitated.

  Subsequently, the first support plate 6a of the present embodiment will be further described with reference to FIG. As shown in FIG. 7, the first support plate 6a has four notches 63. Each of the notches 63 extends radially outward from the bearing arrangement hole 62 between the adjacent contact portions 61. In the present embodiment, each of the protrusion arrangement holes 8 is located between the notches 63 adjacent in the circumferential direction. Therefore, according to the present embodiment, the first support plate 6a is less likely to break than the configuration in which the protrusion arrangement hole 8 and the notch 63 face each other in the radial direction.

  Specifically, in the configuration in which the protrusion arrangement hole 8 and the notch 63 face each other in the radial direction, in order to secure the strength of the first support plate 6a, the distance between the protrusion arrangement hole 8 and the notch 63 is increased. Need to be bigger. This is because when the distance between the protrusion arrangement hole 8 and the notch 63 is small, the first support plate 6a may be broken between the protrusion arrangement hole 8 and the notch 63. In particular, when manufacturing the first support plate 6a by pressing a leaf spring, the first support plate 6a may be broken during the manufacturing process. On the other hand, according to the present embodiment, the projecting portion arrangement hole 8 faces the bearing arrangement hole 62 in the radial direction. Therefore, the strength of the first support plate 6a is improved as compared with a configuration in which the protrusion arrangement holes 8 and the notches 63 face each other.

  Further, for example, in the present embodiment, the first support plate 6a has a disk shape. In such a case, if the distance between the protruding portion arrangement hole 8 and the bearing arrangement hole 62 is increased and they are arranged apart from each other, the outer diameter of the first support plate 6a increases. However, in the present embodiment, the distance between the protrusion arrangement hole 8 and the bearing arrangement hole 62 in the radial direction can be reduced. Therefore, the size of the first support plate 6a can be reduced. More specifically, even if the protrusion arrangement holes 8 are arranged more inside in the radial direction, the first support plate 6a is hard to break because the notch 63 is located between the adjacent protrusion arrangement holes 8. Therefore, the size of the first support plate 6a can be reduced by arranging the protrusion arrangement holes 8 radially inward of the configuration in which the protrusion arrangement holes 8 and the notches 63 face each other.

  As shown in FIG. 7, in the present embodiment, the radially outer end 63 a of the notch 63 is located radially inward of the radially inner end 8 a of the protrusion arrangement hole 8. Therefore, as compared with the configuration in which the radially outer end 63a of the notch 63 is located radially outward from the radially inner end 8a of the protrusion arrangement hole 8, the gap between the notch 63 and the protrusion arrangement hole 8 is larger. The distance increases. As a result, the strength of the first support plate 6a is improved.

  The length of the notch 63 affects the pressure applied by the contact portion 61 to the first bearing 5a. Therefore, the pressure applied to the first bearing 5a by the contact portion 61 can be controlled by adjusting the length of the notch 63. If the pressure applied by the contact portion 61 to the first bearing 5a is too large, it is difficult to adjust the concentricity of the first bearing 5a. On the other hand, if the pressure applied by the contact portion 61 to the first bearing 5a is too small, it becomes difficult to position the first bearing 5a. The length of the notch 63 is determined so that the pressure applied to the first bearing 5a by the contact portion 61 becomes a predetermined pressure.

  As shown in FIG. 6, the first bearing 5a of the present embodiment has, for example, an inclined surface that is inclined with respect to the axial direction on the upper side in the axial direction and on the lower side in the axial direction. Specifically, the first bearing 5a of the present embodiment has a conical shape on the upper side in the axial direction and on the lower side in the axial direction. The contact part 61 and the support surface 24a contact the upper and lower conical surfaces. Furthermore, the first bearing 5a of the present embodiment has a cylindrical surface between the upper and lower conical shapes, and the cylindrical surface and the first porous member 9a face each other in the radial direction. Since the first bearing 5a has a conical surface, concentric adjustment can be easily performed by the applied pressure.

  Subsequently, the upper structure of the motor 1 of the present embodiment will be described with reference to FIGS. FIG. 11 is a diagram illustrating a part of the configuration of the motor 1 according to the present embodiment. Specifically, FIG. 11 is a view of the vicinity of the upper housing 2a as viewed from below. FIG. 12 is a diagram illustrating the second support plate 6b according to the present embodiment.

  As shown in FIG. 11, the motor 1 further includes a second bearing 5b and a second support plate 6b in addition to the upper housing 2a. The second bearing 5b and the second support plate 6b are arranged in the upper housing 2a and are housed in a housing space of the upper housing 2a.

  As shown in FIG. 11, the upper housing 2a has an axial inner side surface 21 similarly to the lower housing 2b. Further, the upper housing 2a of the present embodiment has a protruding portion 7, similarly to the lower housing 2b. The upper housing 2a is an example of a holding member, and holds the second bearing 5b. The second bearing 5b rotatably supports the shaft 31 (FIG. 2), like the first bearing 5a. In the present embodiment, the second bearing 5b is a sliding bearing containing oil.

  As shown in FIG. 12, the second support plate 6 b has a protrusion arrangement hole 8, a contact surface 10, a contact portion 61, and a notch 63, similarly to the first support plate 6 a. Further, the second support plate 6b has a bearing arrangement hole 62, like the first support plate 6a. The second bearing 5b is arranged in the bearing arrangement hole 62 of the second support plate 6b.

  FIG. 13 is a diagram illustrating a part of the configuration of the motor 1 according to the present embodiment. More specifically, FIG. 13 is a view in which the second support plate 6b is omitted from the upper part of the motor 1 shown in FIG. As shown in FIG. 13, the motor 1 further includes a second porous member 9b. The second porous member 9b is arranged in the upper housing 2a and is housed in a housing space of the upper housing 2a. The second porous member 9b contains oil like the first porous member 9a. Further, the upper housing 2a has a wall portion 22, as in the lower housing 2b.

  The upper structure of the motor 1 has been described with reference to FIGS. According to the present embodiment, the second support plate 6b can be fixed to the upper housing 2a by the same method as the manufacturing method described with reference to FIG. Therefore, the second support plate 6b can be easily fixed.

[Embodiment 2]
Next, a second embodiment of the present invention will be described with reference to FIG. However, items different from the first embodiment will be described, and description of the same items as the first embodiment will be omitted. The second embodiment differs from the first embodiment in the configuration of the protrusion 7 and the protrusion arrangement hole 8.

  FIG. 14 is an enlarged view showing a part of the configuration of the motor 1 according to the second embodiment. Specifically, FIG. 14 shows a part of the lower structure of the motor 1. As shown in FIG. 14, in this embodiment, the radial length Lr2 of the second hole 82 is equal to the radial length Lt4 of the first protrusion 71, or the radial length Lt4 of the first protrusion 71. Is less than or equal to the length Lt4. Therefore, the first projecting portion 71 of the present embodiment comes into contact with both outer edges of the second hole portion 82 in the radial direction and both edges on the radially inner side. The configuration for fixing the second support plate 6b is the same as the configuration for fixing the first support plate 6a, and a description thereof will be omitted.

  The second embodiment of the present invention has been described above. According to the present embodiment, when the first protrusion 71 is disposed in the second hole 82, the first protrusion 71 is press-fitted into the second hole 82. Therefore, the first support plate 6a and the second support plate 6b can be more firmly fixed.

[Embodiment 3]
Next, a third embodiment of the present invention will be described with reference to FIGS. However, items different from the first and second embodiments will be described, and description of the same items as the first and second embodiments will be omitted. The third embodiment is different from the first and second embodiments in the configuration of the protrusion 7 and the protrusion arrangement hole 8.

  FIG. 15 is a diagram illustrating a part of the configuration of the motor 1 according to the third embodiment. More specifically, FIG. 15 is a view of the vicinity of the lower housing 2b before the first support plate 6a is fixed, as viewed from above. FIG. 16 is an enlarged view showing a part of the configuration of the motor 1 according to the third embodiment. Specifically, FIG. 16 shows a part of FIG. 15 in an enlarged manner.

  As shown in FIGS. 15 and 16, the protrusion arrangement hole 8 according to the third embodiment further includes a third hole 83 in addition to the first hole 81 and the second hole 82. The third hole 83 is connected to the second hole 82. In the present embodiment, the third hole 83 is connected to the radially outer end of the second hole 82 and extends radially outward. The length of the third hole 83 in the direction orthogonal to the radial direction is smaller than that of the first hole 81, and one end 83 a of the third hole 83 is connected to the other end 81 a of the first hole 81 and the contact surface 10. Adjacent through.

  FIG. 17 is a diagram showing a cross section taken along line XVII-XVII shown in FIG. As shown in FIG. 17, the protrusion 7 further has a third protrusion 73. The third protrusion 73 protrudes from the second protrusion 72 toward the first support plate 6a. Specifically, the third protrusion 73 protrudes from the surface facing the lower housing 2b of the second protrusion 72 toward the first support plate 6a. The third projecting portion 73 has a side surface 73a on the other end side. The third protrusion 73 has a side surface 73b on one end side and a surface 73c facing the lower housing 2b.

  The side surface 73a on the other end side of the third protrusion 73 is inclined with respect to the axial direction. Specifically, in a state where the protrusion 7 is arranged in the first hole 81, the side surface 73 a on the other end side of the third protrusion 73 is a side surface on the third hole 83 side. The side surface 73a on the other end side of the third protruding portion 73 is inclined in a direction away from the axial inner side surface 21 of the lower housing 2b toward the third hole portion 83 side. A side surface 73b on one end side of the third protrusion 73 is parallel to the axial direction. The surface 73c facing the lower housing 2b of the third protrusion 73 is connected to the side surface 73a at the other end, and is connected to the side surface 73b at one end.

  FIG. 18 is a diagram illustrating a part of the configuration of the motor 1 according to the third embodiment. Specifically, FIG. 18 is a view of the vicinity of the lower housing 2b to which the first support plate 6a is fixed, as viewed from above. FIG. 19 is a diagram showing a cross section along the line XIX-XIX shown in FIG.

  As shown in FIG. 19, when the first support plate 6a is fixed to the lower housing 2b, the third protrusion 73 is arranged in the third hole 83. Further, a side surface 73a on the other end side of the third projecting portion 73 faces the other end 83b of the third hole portion 83, and a side surface 73b on one end side of the third projecting portion 73 is connected to one end 83a of the third hole portion 83. Oppose. One end 83a and the other end 83b of the third hole 83 face each other in the circumferential direction.

  Specifically, when fixing the first support plate 6a, first, the protrusion 7 is arranged in the first hole 81. Then, for example, the first support plate 6a is rotated in the circumferential direction. At this time, the first support plate 6a rotates while the other end 81a of the first hole 81 slides on the side surface 73a on the other end side of the third protrusion 73. As a result, the third protrusion 73 rides on the contact surface 10. In other words, the surface 73 c facing the lower housing 2 b of the third protrusion 73 contacts the contact surface 10. After that, for example, the first support plate 6a is rotated until the third protrusion 73 is disposed in the third hole 83. Specifically, for example, the first support plate 6a is rotated until the side surface 73b on one end side of the third protrusion 73 passes through one end 83a of the third hole 83. As a result, the third protrusion 73 that has climbed onto the contact surface 10 falls into the third hole 83, and the third protrusion 73 is disposed in the third hole 83. Note that the first protrusion 71 is bent until the third protrusion 73 is arranged in the third hole 83.

  The third embodiment of the present invention has been described above. According to the present embodiment, the third protrusion 73 is disposed in the third hole 83. In other words, the third hole 83 is disposed between one end 83a of the third hole 83 and the other end 83b of the third hole 83. As a result, the rotation of the first support plate 6a in the circumferential direction is suppressed. Therefore, for example, even when the motor 1 rotates in both the clockwise direction and the counterclockwise direction, when the motor 1 rotates in one direction, the first support plate 6a moves in the circumferential direction, or the protrusion 7 is fixed. Can be prevented from becoming loose. The configuration for fixing the second support plate 6b is the same as the configuration for fixing the first support plate 6a, and a description thereof will be omitted.

  The first to third embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to the above embodiment. The present invention can be implemented in various modes without departing from the gist thereof.

  For example, in the embodiment according to the present invention, the upper housing 2a and the lower housing 2b each have four protrusions 7, but the number of the protrusions 7 can fix the first support plate 6a and the second support plate 6b. As long as it is not particularly limited.

  In the embodiment according to the present invention, the first support plate 6a and the second support plate 6b each have four contact portions 61. However, the number of the contact portions 61 is such that the first bearing 5a and the second bearing 5b are concentric. There is no particular limitation as long as it can be supported in an adjustable manner.

  In the embodiment according to the present invention, the lower housing 2b has the protrusion 7 and the first support plate 6a has the protrusion arrangement hole 8 and the contact surface 10, but the lower housing 2b has the protrusion arrangement hole. 8 and the contact surface 10, and the first support plate 6 a may have the protrusion 7. Similarly, in the embodiment according to the present invention, the upper housing 2a has the protrusion 7 and the second support plate 6b has the protrusion arrangement hole 8 and the contact surface 10, but the upper housing 2a has the protrusion arrangement hole 8 And the contact surface 10, and the second support plate 6 b may have the protrusion 7. However, since the first support plate 6a and the second support plate 6b have the protruding portion locating holes 8, the motor 1 has a lower configuration than the configuration in which the lower housing 2b and the upper housing 2a have the protruding portion locating holes 8. Foreign substances such as dust or moisture hardly enter the inside.

  In the embodiment according to the present invention, the motor 1 includes the first porous member 9a and the second porous member 9b, but at least one of the first porous member 9a and the second porous member 9b is omitted. Is also good. When the first porous member 9a is omitted, when fixing the first support plate 6a, the step S1 described with reference to FIG. 10 is omitted. Similarly, when the second porous member 9b is omitted, when fixing the second support plate 6b, a step corresponding to the step S1 described with reference to FIG. 10 is omitted.

  In the embodiment according to the present invention, the second protrusion 72 extends radially outward, but the direction in which the second protrusion 72 extends is not particularly limited as long as it extends in a direction intersecting the axial direction.

  FIG. 20 is a view showing a protrusion 7 and a protrusion arrangement hole 8 according to another embodiment of the present invention. For example, the second protrusion 72 may extend radially inward as shown in FIG. FIG. 21 is a view showing a protrusion 7 and a protrusion arrangement hole 8 according to still another embodiment of the present invention. The second protrusion 72 may extend in the circumferential direction as shown in FIG. 21 has a first hole 81 and a second hole 82. When the second protrusion 72 extends in the circumferential direction, the protrusion arrangement hole 8 is May be constituted by a single hole extending in the direction. In other words, the protrusion arrangement hole 8 may be configured by a hole having a constant radial length.

  Further, in the embodiment according to the present invention, the protrusion 7 and the protrusion arrangement hole 8 are provided in each of the lower structure and the upper structure of the motor 1. However, only one of the lower structure and the upper structure of the motor 1 has The part 7 and the protrusion arrangement hole 8 may be provided.

  INDUSTRIAL APPLICATION This invention can be utilized suitably for a motor. In particular, the present invention is useful for small motors.

Reference Signs List 1 Motor 2 Housing 3 Rotor 4 Stator 5a First bearing 5b Second bearing 6a First support plate 6b Second support plate 7 Projection 8 Projection arrangement hole 10 Contact surface 21 Axial inner surface 31 Shaft 61 Contact part 62 Bearing arrangement Hole 62a Edge 71 First protrusion 72 Second protrusion 81 First hole 82 Second hole CA Central axis

Claims (12)

A rotor having a shaft extending along a central axis;
A stator radially facing the rotor,
A bearing that rotatably supports the shaft,
A holding member for holding the bearing,
A support plate that faces the surface of the holding member on which the stator is arranged, and that supports the bearing concentrically and freely.
The support plate,
A bearing arrangement hole that penetrates in the axial direction and the bearing is arranged,
A contact portion extending from an edge of the bearing arrangement hole and in contact with an outer surface of the bearing;
One of the support plate and the holding member has a protrusion extending toward the other of the support plate and the holding member,
The protrusion is
A first protrusion extending in the axial direction;
A second projection extending from the first projection in a direction intersecting the axial direction,
The other of the support plate and the holding member has a protrusion arrangement hole that penetrates in the axial direction and is located radially outward with respect to the bearing arrangement hole,
The first protrusion is arranged in the protrusion arrangement hole,
The motor, wherein the second protrusion is in axial contact with the other contact surface of the support plate and the holding member. The protrusion arrangement hole has a first hole and a second hole connected to the first hole,
The opening of the first hole has a shape surrounding the outer shape of the protruding portion when viewed from the axial direction,
2. The motor according to claim 1, wherein the first protrusion contacts radially outer and radially inner sides of the second hole. 3. The protrusion arrangement hole,
A first hole,
A second hole connected to the first hole;
A third hole connected to the second hole and having a length in a direction perpendicular to the radial direction smaller than the first hole;
The opening of the first hole has a shape surrounding the outer shape of the protruding portion when viewed from the axial direction,
One end of the third hole is adjacent to the other end of the first hole via the contact surface,
The projecting portion has a third projecting portion projecting from the second projecting portion toward the other of the support plate and the holding member,
The third protrusion is disposed in the third hole,
The motor according to claim 1, wherein a side surface on the other end side of the third protrusion is inclined with respect to an axial direction. A housing that houses the rotor, the stator, the bearing, and the support plate,
The housing includes the holding member,
The holding member has the protrusion,
The motor according to any one of claims 1 to 3, wherein the support plate has the projecting portion arrangement hole and the contact surface. The support plate,
A plurality of the contact portions arranged in a circumferential direction,
A notch extending radially outward from the bearing arrangement hole between the adjacent contact portions;
And a plurality of the protrusion arrangement holes,
5. The motor according to claim 1, wherein each of the plurality of projecting portion arrangement holes is located between the notches adjacent in a circumferential direction. 6.   The motor according to claim 5, wherein a radially outer end of the notch is located radially inward of a radially inner end of the protrusion arrangement hole. The holding member is made of resin,
The holding member has four of the protrusions,
The motor according to any one of claims 1 to 6, wherein the four protrusions are arranged at 90 ° intervals in a circumferential direction.   The motor according to any one of claims 1 to 7, wherein the contact surface applies pressure to the second protrusion. With a porous member containing oil,
The support plate has a plurality of the protrusions,
The holding member has at least one wall connecting at least two of the plurality of protrusions,
The motor according to any one of claims 1 to 8, wherein the porous member is disposed radially inward of the wall portion and between the support plate and the holding member. The holding member has a plurality of the wall portions,
The motor according to claim 9, wherein the plurality of walls connect the plurality of protrusions. A method for manufacturing a motor according to any one of claims 1 to 8, wherein
Placing the bearing on the holding member;
Contacting the contact portion with the bearing, arranging the bearing in the bearing arrangement hole, and inserting the protrusion into the protrusion arrangement hole;
Rotating at least one of the support plate and the holding member in the circumferential direction to contact the second protrusion with the contact surface. It is a manufacturing method of the motor of Claim 9 or Claim 10, Comprising:
A step of arranging the porous member whose axial length is larger than the wall, on the radially inner side of the wall,
Placing the bearing on the holding member;
Contacting the contact portion with the bearing, arranging the bearing in the bearing arrangement hole, and inserting the protrusion into the protrusion arrangement hole;
Rotating at least one of the support plate and the holding member in the circumferential direction to contact the second protrusion and the contact surface,
The method of manufacturing a motor, wherein the supporting plate is pressed against the porous member in the step of inserting the protrusion into the protrusion arrangement hole.

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