JP5318849B2 - Motor and blower fan - Google Patents

Description

  The present invention relates to a motor and a blower fan using the motor, and more particularly to an improvement of a motor that enables vibration reduction.

  Conventionally, various vibration and noise reduction techniques have been proposed for motors used for blower fans and the like. For example, in the motor disclosed in Japanese Patent Application Laid-Open No. 2009-213225, since the armature is supported by the base portion (housing) via an elastic member such as a coil spring, the armature is attached to the base portion. For example, the electromagnetic vibration generated by the armature is prevented from propagating to the housing, and has a great effect on vibration suppression.

In the motor disclosed in the publication, a cylindrical bearing holding portion is provided in the base portion, and the shaft of the rotor portion is connected to the central axis of the shaft via a bearing member on the inner peripheral surface of the bearing holding portion. Is supported so as to be rotatable around the center. The bearing holding portion is inserted through an insertion hole provided in a central portion of the armature. A protrusion that protrudes radially outward is provided on the outer peripheral surface of the bearing holding portion, and the inner peripheral surface of the insertion hole of the armature is abutted against the protrusion by urging by the elastic member. A contact portion is provided, which prevents the armature from being detached from the bearing holding portion. When the armature is incorporated into the base portion, the bearing holding portion is inserted through the armature insertion hole so as to resist the biasing force of the elastic member. At this time, if the protrusion and the contact portion are in the same position in the circumferential direction, it will interfere with the insertion, so that the circumferential position of the protrusion and the contact portion is shifted with respect to each other. The bearing holding portion is inserted into the insertion hole, and then the armature is rotated with respect to the bearing holding portion so that the protrusion is positioned at the same position in the circumferential direction as the contact portion. At this position, the protrusion is positioned in the circumferential direction by the circumferential movement restricting portion. Thus, the assembly of the armature into the base portion is completed, and the abutting portion comes into contact with the protruding portion by the elastic member.
JP 2009-213225 A

  By the way, when the armature is assembled in the base portion with the same configuration as the conventional motor (the motor described in the publication), the assembling work can be facilitated by adopting the same assembling method for the motor. It becomes possible to do. In addition, when the protrusion is positioned at the same position in the circumferential direction as the abutment portion, the protrusion is positioned in the circumferential direction by the circumferential movement restricting portion, so that the protrusion is in the circumferential direction with respect to the abutment portion. The possibility of slipping is low, and the problem that the armature is detached from the bearing holding portion due to the deviation is unlikely to occur.

  Here, even if the projection part is displaced in the circumferential direction with respect to the contact part in the assembly work process after the armature is incorporated into the base part, the operator may not be able to confirm it visually. For example, when the rotor part is shaped to cover the outer periphery side of the armature and the side opposite to the base part, after such a rotor part is incorporated in the bearing holding part, the projection part is in contact with the contact part. It becomes impossible to confirm whether or not it is displaced in the circumferential direction. Particularly in such a case, it is necessary to make the structure in which the protrusions are more difficult to shift in the circumferential direction with respect to the contact part, and there is room for improvement.

  The present invention has been made in view of such points, and an object of the present invention is to improve the configuration of the conventional motor, thereby maintaining the ease of assembling the armature into the base portion. On the other hand, the protrusion is configured to be more difficult to shift in the circumferential direction with respect to the contact portion.

In order to achieve the above object, a motor of the present invention has a shaft and a rotor magnet, a rotor portion that rotates around the central axis of the shaft, and an insertion hole that extends in the central axis direction at the central portion. The armature is disposed so as to face the rotor magnet in the radial direction of the rotor portion, and is configured to generate torque for rotating the rotor portion with the rotor magnet. And a base part for supporting the armature disposed on one side in the central axis direction with respect to the armature, and the armature side surface of the base part inserted through the insertion hole. In such a state, the armature is provided so as to extend toward the other side in the central axis direction, and the armature is supported on the outer peripheral surface so as to be movable in the central axis direction, and the inner peripheral surface via the bearing member Turn the shaft A substantially cylindrical bearing holding portion that supports the armature, and an elastic member that urges the armature toward the other side in the central axis direction with respect to the base portion. The bearing holding portion is configured to be inserted into the insertion hole by moving from the front end side of the bearing holding portion to the one side in the central axis direction with respect to the bearing holding portion, The outer peripheral surface of the bearing holding portion is provided with a protruding portion that protrudes radially outward,
An inner peripheral surface portion of the insertion hole of the armature has an abutting portion that abuts against the protrusion from the one side in the central axis direction by the urging of the elastic member, and a circumferential portion with respect to the abutting portion. It is arranged so as to extend in the central axis direction on one side in the direction, and when the bearing holding part is inserted into the insertion hole, the projection part is from the one side in the central axis direction with respect to the contact part. The central axis passage portion that enables relative movement to the other side, and the central axis relative to the contact portion at the same position in the circumferential direction from the central axis passage portion and the contact portion. The protrusion is disposed so as to extend in the circumferential direction over the position on the other side of the direction, and the protrusion is positioned on the other side in the central axis direction with respect to the contact portion in the central axis direction passage portion. By rotating the armature with respect to the bearing holding portion, A circumferential passage portion that allows the protrusion to move from the central axial passage portion toward the contact portion relative to the contact portion; and a radially outer portion of the circumferential passage portion. A first movement that is arranged so as to project from the surface to the circumferential passage portion, and the protrusion moves relative to the contact portion from the central axial passage portion toward the contact portion by deformation. On the other hand, a flexible claw that restricts the second movement in which the protrusion moves relative to the corresponding contact portion from the same position in the circumferential direction as the contact portion toward the central axial passage portion. Part is formed.

  With the above configuration, when the armature is incorporated into the base portion, the bearing holding portion is inserted into the insertion hole so that the projection portion moves through the central axial passage portion, and the projection portion is in contact with the contact portion. The armature is moved with respect to the bearing holding portion in a state in which the protrusion is positioned on the other side in the central axial direction with respect to the contact portion in the central axial passage portion. By rotating, the protrusion moves through the circumferential passage portion from the central axial passage portion to the contact portion side. Since this movement (first movement) is allowed by deformation of the flexible claw part, the protrusion part is positioned at the same position in the circumferential direction as the contact part. Thus, the assembly of the armature into the base portion is completed, and the contact portion is brought into contact with the projection portion by the elastic member. In this way, the work of assembling the armature into the base portion can be easily performed. Then, even if the protruding portion tries to move from the same position in the circumferential direction to the contact portion to the side of the central axial direction passage portion, this movement (second movement) is restricted by the claw portion. Therefore, such a nail | claw part becomes much more difficult to shift | deviate in a circumferential direction with respect to a contact part.

  According to an embodiment of the present invention, the claw portion extends so as to incline radially inward in the circumferential passage portion toward the contact portion, and the first movement of the protrusion portion. Sometimes, the first movement is allowed by bending and deforming radially outward by being pressed by the projection, while the projection is at the tip of the claw during the second movement of the projection. It is comprised so that the said 2nd movement may be controlled by striking.

  Thus, the first movement of the protrusion can be performed more smoothly, and the second movement is more reliably regulated. In addition, since the movement resistance by the claw portion disappears when the first movement of the projecting portion is completed, the operator can feel that the incorporation of the armature into the base portion is completed.

  As described above, when the claw portion extends so as to incline toward the abutting portion toward the radial inner side in the central axial direction passage portion, the tip surface of the projection portion at the time of the first movement It is preferable that the portion on the contact portion side is inclined radially inward toward the contact portion.

  If it does in this way, the bending deformation of the nail | claw part by the press of a projection part will be performed smoothly, and the 1st movement of a projection part can be performed still more smoothly.

  According to an embodiment of the present invention, the armature includes a stator core formed of a magnetic material, a first insulator that covers the one side portion of the stator core in the central axis direction, and the stator core. A second insulator that covers the portion on the other side in the central axis direction, and the protrusion is provided on a portion of the outer peripheral surface of the bearing holding portion that corresponds to the second insulator in the central axis direction. And the stator core, the first insulator, and the second insulator are each provided with a through hole as the insertion hole, and the inner circumferential surface portion of each through hole of the stator core, the first insulator, and the second insulator is arranged in the direction of the central axis. Passage portions are respectively formed on the inner peripheral surface portion of the through hole of the second insulator, and the contact portion, the circumferential passage portion, and Tight unit is formed.

  Alternatively, the armature includes a stator core formed of a magnetic material, a first insulator that covers the one side portion of the stator core in the central axis direction, and the other side portion of the stator core in the central axis direction. A second insulator covering the projection, and the protrusion is provided on a portion of the outer peripheral surface of the bearing holding portion corresponding to the first insulator in the central axis direction. The stator core, the first insulator, and the second insulator 2 insulators are each provided with a through hole as the insertion hole, and the abutment portion, the central axial passage portion, the circumferential passage portion, and the claw portion are formed on an inner peripheral surface portion of the through hole of the first insulator. The structure that is formed may be used.

  Thus, if the protrusion is provided in a portion corresponding to the first insulator on the outer peripheral surface of the bearing holding portion in the central axis direction, there is no need to provide the central axial passage portion in the stator core and the second insulator. Thereby, in particular, the entire inner peripheral surface of the stator core can be substantially in contact with the outer peripheral surface of the bearing holding portion. As a result, the inner peripheral surface of the stator core is free of irregularities, and the volume of the stator core is increased. Can do.

  Another aspect of the present invention is an invention of a blower fan including the motor described above and an impeller rotated by the motor.

  During the driving of the blower fan, the protrusion does not shift in the circumferential direction with respect to the contact portion. In addition, since the armature of the motor is supported on the base (housing) via the elastic member, the electromagnetic vibration generated by the armature is prevented from propagating to the housing, and the noise of the blower fan is reduced. be able to.

  As described above, according to the present invention, it is possible to further prevent the protrusion from being displaced from the contact portion in the circumferential direction while maintaining the ease of assembling the armature into the base portion.

It is sectional drawing which shows the axial flow fan as a ventilation fan provided with the motor which concerns on embodiment of this invention. It is the top view which looked at the housing of the axial flow fan from the upper side. It is the perspective view seen from the slanting upper side which shows the state which incorporated the armature in the base part. It is a top view which shows the state which incorporated the armature in the base part. It is the VV sectional view taken on the line of FIG. It is a top view which shows a stator core. It is the perspective view seen from the diagonal upper side which shows an upper insulator. It is the perspective view seen from the slanting upper side which shows a lower insulator. It is the perspective view seen from the slanting upper side which shows a part of base part and a bearing holding | maintenance part. It is a top view which shows the state (state in which a projection part is located in a center-axis direction channel | path part) in the middle of incorporating the armature in a base part. It is a top view which shows the state (state in which a projection part is located in a circumferential direction channel | path part) in the middle of incorporating the armature in the base part. It is the perspective view seen from the diagonal upper side which shows a part of base part and bearing holding part at the time of providing the projection part in the part corresponding to a lower insulator in the central-axis direction of a shaft in the outer peripheral surface of a bearing holding part. . It is the perspective view seen from the diagonal upper side which shows the lower insulator when a projection part is provided like FIG. It is a top view which abbreviate | omits description of a stator core and an upper insulator, and shows the state which incorporated the armature in the base part. FIG. 15 is a view corresponding to FIG. 14 showing a state where the armature is incorporated in the base portion (a state where the protrusion is located in the central axial passage portion) when the protrusion is provided as shown in FIG. 12.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an axial fan A as a blower fan provided with a motor according to an embodiment of the present invention. In FIG. 1, a fan shaft (a center axis J described later) of the axial fan A is drawn so as to extend in the vertical direction of the drawing, and the vertical direction of the drawing is defined as the vertical direction of the axial fan A for convenience. However, the actual mounting state of the axial fan A is not limited to this.

  The axial fan A includes a motor 1 having a rotor portion 2 and an armature 3, and an impeller 5 that is rotated by the motor 1 and generates an air flow from the upper side to the lower side by the rotation. The impeller 5 includes a hub 6 and a plurality of propeller blades 7 fixed to the outer peripheral surface of the hub 6 at substantially equal intervals in the circumferential direction. The hub 6 has a cup shape with an open lower side, and a shaft 8 is fixed to a central portion of the upper end surface portion of the hub 6 so as to rotate integrally with the hub 6. The shaft 8 extends downward from the upper end surface portion of the hub 6. That is, the central axis J of the shaft 8 (hereinafter simply referred to as the central axis J) extends in the up-down direction. The impeller 5 (hub 6 and propeller blade 7) is rotated about the central axis J by the rotation of the rotor portion 2 of the motor 1 as described later. Hereinafter, a direction in which the central axis J extends is referred to as a central axis direction, and a direction perpendicular to the central axis direction is referred to as a radial direction.

  The axial fan A further includes a cylindrical housing 11 that covers the entire outer periphery of the propeller blade 7. As shown in FIG. 2, the outer shape of the housing 11 is substantially rectangular when viewed from the central axis direction, and the housing 11 (that is, the axial fan A) is used as a mounting member in the vicinity of the four corners. Screw insertion holes 11a for attachment are provided. The inner peripheral surface of the housing 11 forms a flow path through which an air flow generated by the rotation of the impeller 5 flows. By the flow of air in the flow path, the energy of the air flow is converted into static pressure energy. Is done.

  The rotor unit 2 includes a hub 6 and a shaft 8 of the impeller 5, and a cylindrical rotor magnet 25 attached and fixed to the inner peripheral surface of the hub 6 via a cylindrical rotor yoke 26. In the present embodiment, the hub 6 and the shaft 8 of the impeller 5 also serve as the rotor portion 2. The rotor unit 2 rotates about the central axis J, thereby rotating the impeller 5 about the central axis J. The rotor magnet 25 is magnetized so that N poles and S poles are alternately arranged in the circumferential direction. The rotor yoke 26 is made of a magnetic material, and prevents the magnetic field formed by the rotor magnet 25 from leaking outside the axial fan A.

  The armature 3 is disposed so as to face the rotor magnet 25 inward of the rotor portion 2 in the radial direction, and is configured to generate torque for rotating the rotor portion 2 with the rotor magnet 25. It has been done. Specifically, the rotor magnet 25 and the radially outer surface of a circumferentially extending portion 31e of a magnetic pole tooth 31c of a stator core 31 described later in the armature 3 face each other. An insertion hole 30 through which a bearing holding portion 15 described later is inserted is provided in the central portion of the armature 3 so as to extend in the central axis direction. The motor 1 of the present embodiment is an outer rotor type motor in which the rotor magnet 25 is positioned on the radially outer side than the armature 3.

  A base portion 14 for supporting the armature 3 is disposed on one side (lower side) in the central axis direction with respect to the armature 3. As shown in FIG. 2, the base portion 14 has a circular shape when viewed from the central axis direction and is supported by the housing 11. Specifically, a plurality (three in this embodiment) of supporting ribs 12 extend outward in the radial direction on the outer peripheral surface of the base portion 14 (more precisely, one circumferential direction extends radially outward. It extends so as to incline to the side). The radially outer end portions of the support ribs 12 are connected and fixed to the lower end portion of the inner peripheral surface of the housing 11. Thus, the base portion 14 is supported on the housing 11 via the support rib 12.

  On the armature 3 side surface (upper surface) of the base portion 14, a substantially cylindrical bearing holding portion 15 having a through hole 15 a centering on the central axis J is inserted into the insertion hole 30 of the armature 3. And extending toward the other side (upper side) in the central axis direction. The bearing holding part 15 supports the armature 3 positioned so as to cover the entire outer circumference of the bearing holding part 15 so as to be movable in the central axis direction on the outer peripheral surface thereof.

  Upper and lower ball bearings 16 and 17 as bearing members are respectively provided at two locations on the inner peripheral surface of the bearing holding portion 15 (the inner peripheral surface of the through hole 15a). The shaft 8 is inserted into the through hole 15 a of the bearing holding portion 15, and the shaft 8 is supported by the upper and lower ball bearings 16 and 17 so as to be rotatable about the central axis J. As a result, the shaft 8 is rotatably supported on the inner peripheral surface of the bearing holding portion 15 via the bearing member.

  A preload spring 18 formed of a compression coil spring is provided around the shaft 8 between the upper end surface portion of the hub 6 and the upper ball bearing 16. The preload spring 18 presses the inner ring of the upper ball bearing 16 downward and presses the hub 6 and the shaft 8 upward. In the vicinity of the lower end of the shaft 8, a retaining member 19 is attached so that the shaft 8 does not come out upward from the lower ball bearing 17, and this retaining member 19 presses the inner ring of the lower ball bearing 17 upward. Even if the upper ball bearing 16 is pressed downward, it is further lowered by the step formed on the inner peripheral surface of the through hole 15a of the bearing holding portion 15 just below the outer ring of the upper ball bearing 16. Is immobile. Even when the lower ball bearing 17 is pressed upward, the step formed on the inner peripheral surface of the through-hole 15a immediately above the outer ring of the lower ball bearing 17 makes it impossible to move further upward. It has become. Accordingly, the shaft 8 and the upper and lower ball bearings 16 and 17 are held at predetermined positions with respect to the bearing holding portion 15. Further, the upper and lower ball bearings 16 and 17 can obtain stable bearing rotation accuracy by applying a preload. In place of the ball bearings 16 and 17, for example, a slide bearing may be employed, or other bearing members may be employed.

  As shown in FIGS. 3 to 5, the armature 3 includes a stator core 31, an upper insulator 32 (insulating member), a lower insulator 33 (insulating member), a coil 34, and a circuit board 35. ing. The stator core 31 and the upper and lower insulators 32, 33 are provided with through holes 31a, 32a, 33a as the insertion holes 30, respectively. 3 to 5, only the center portion where the bearing holding portion is provided and the vicinity thereof are shown as the base portion, and the upper ball bearing 16, the lower ball bearing 17, the coil 34, and the circuit board are shown. 35, an armature biasing spring 41 and the like which will be described later are omitted (the same applies to FIGS. 9 to 12, 14 and 15).

  As shown in FIGS. 5 and 6, the stator core 31 is configured by stacking a plurality of stator laminations formed of a thin plate-like magnetic body. In this embodiment, the axial fan A is used especially for cooling an electronic device, and a single-phase bipolar or a two-phase unipolar is adopted as a driving method. When such a drive system is used, the stator core has four magnetic poles. For this reason, the stator core 31 of this embodiment is integrally formed of the same material as the core back portion 31b and the annular core back portion 31b in which the through hole 31a is formed in the center portion, and the center axis J is the center. And four magnetic pole teeth 31c arranged at substantially equal intervals in the circumferential direction. Each magnetic pole tooth 31c includes a radially extending portion 31d extending radially outward from the outer peripheral surface of the core back portion 31b, and a circumferentially extending portion extending in the circumferential direction on the distal end side of the radially extending portion 31d. 31e, and is substantially T-shaped when viewed from the central axis direction.

  3 to 5 and 7, the upper insulator 32 covers the upper portion of the stator core 31 (the portion on the other side in the central axis direction), and the lower insulator 33 is illustrated in FIGS. 5 and 8. As shown, the lower portion of the stator core 31 (the portion on the one side in the central axis direction) is covered. However, the inner peripheral surface of the core back portion 31b (that is, the inner peripheral surface of the through hole 31a of the stator core 31), the radially outer surface of the circumferentially extending portion 31e of each magnetic pole tooth 31c, and the end surfaces on both sides in the circumferential direction are on the upper side. And it is not covered with the lower insulators 32 and 33 and is exposed. The upper and lower insulators 32 and 33 are fixed in a state where they are abutted with each other at a substantially center in the vertical direction of the stator core 31. The lower insulator 33 corresponds to a first insulator, and the upper insulator 32 corresponds to a second insulator.

  A portion of the upper insulator 32 that covers the upper surface of the circumferentially extending portion 31 d of each magnetic pole tooth 31 c is provided with an upper coil support portion 32 b that protrudes upward to support the upper end portion of the coil 34, and the lower insulator 33. A lower coil support portion 33b that protrudes downward to support the lower end portion of the coil 34 is provided at a portion that covers the lower surface of the circumferentially extending portion 31e of each magnetic pole tooth 31c.

  At four locations in the circumferential direction of the inner circumferential surface portion of the through-hole 32 a (the insertion hole 30 of the armature 3) of the upper insulator 32, the radially inner surface covers the upper surface of the core back portion 31 b and the outer periphery of the bearing holding portion 15. A core back portion upper surface covering portion 32c that is substantially in contact with the surface is provided. Further, at four locations in the circumferential direction on the inner circumferential surface portion of the through-hole 33a (the insertion hole 30 of the armature 3) of the lower insulator 33, the radially inner surface covers the lower surface of the core back portion 31b. The core back part lower surface coating | coated part 33c which touches substantially the outer peripheral surface of 15 is each provided. Furthermore, contact portions 31 f that are substantially in contact with the outer peripheral surface of the bearing holding portion 15 are provided at four positions in the circumferential direction of the inner peripheral surface portion of the through hole 31 a (the insertion hole 30 of the armature 3) of the stator core 31. The core back portion upper surface covering portion 32c, the core back portion lower surface covering portion 33c, and the contact portion 31f are provided at the same position in the circumferential direction. In addition, about the four core back part upper surface coating | coated parts 32c of the upper insulator 32, it can be said that four places of one core back part upper surface coating | coated part over the perimeter are notched. The same applies to the four core back portion lower surface covering portions 33c of the lower insulator 33 and the four contact portions 31f of the stator core 31. These notched portions correspond to a central axial direction passage portion 46 described later.

  The coil 34 is made of a copper wire and is wound around the radially extending portion 31 d of each magnetic pole tooth 31 c in the stator core 31 via upper and lower insulators 32 and 33. The upper and lower insulators 32 and 33 are interposed between the coil 34 wound in this way and the stator core 31, and the coil 34 does not directly contact the stator core 31. Further, the upper end portion and the lower end portion of the coil 34 wound as described above by the upper and lower coil support portions 32b and 33b have a diameter from the radially outer surface of the circumferentially extending portion 31e of the magnetic pole tooth 31c. It is supported so as not to protrude outward.

  The circuit board 35 has a through hole 35a at the center thereof, and is fixedly attached to the lower insulator 33 by fitting the peripheral edge portion at the lower end of the lower insulator 33 into the through hole 35a. The circuit board 35 includes a printed board and circuit components mounted on the printed board. A conductive pattern formed of copper foil is printed on the printed circuit board, and a control circuit is configured by the mounted circuit components and the conductive pattern. The end of the coil 34 is electrically connected to the control circuit, and when a current is supplied from the external power source to the circuit board 35, the energization of the coil 34 is controlled by the control circuit, and the rotor unit 2 That is, the rotation of the impeller 5 is controlled. The energization control of the coil 34 generates a magnetic field in the stator core 31, and a torque that rotates the rotor portion 2 about the central axis J is generated by the interaction between this magnetic field and the magnetic field generated by the rotor magnet 25. As a result, the impeller 5 rotates about the central axis J.

  The armature 3 is supported with respect to the base portion 14 via an armature biasing spring 41 made of a compression coil spring. Specifically, as shown in FIG. 5, an upper spring support portion 33 d formed of an annular groove is formed on the lower surface of the core back portion lower surface covering portion 33 c in the lower insulator 33 of the armature 3. On the other hand, a lower spring support portion 14 a formed of an annular groove is formed around the base end (lower end) of the bearing holding portion 15 in the base portion 14. The armature biasing spring 41 has its spring central axis in the vertical direction around the lower portion of the bearing holding portion 15 between the upper spring support portion 33d of the lower insulator 33 and the lower spring support portion 14a of the base portion 14. It is arrange | positioned so that it may extend. As a result, the armature 3 is urged (pressed) by the armature urging spring 41 toward the other side (upper side) in the central axis direction with respect to the base portion 14. That is, the armature biasing spring 41 constitutes an elastic member that biases the armature 3 toward the other side in the central axis direction with respect to the base portion 14.

  As shown in FIG. 3 to FIG. 5 and FIG. 9, on the outer peripheral surface of the bearing holding portion 15, the portion corresponding to the upper insulator 32 in the central axis direction (four locations in the circumferential direction) protrudes radially outward. Protrusions 15b are provided at substantially equal intervals in the circumferential direction. And, on the inner peripheral surface portion (four locations in the circumferential direction) of the upper insulator 32, the armature biasing spring 41 biases the projection portion 15b from the one side (lower side) in the central axis direction, respectively. An abutting portion 45 that abuts is formed. Specifically, the upper surface of one end in the circumferential direction and the inner peripheral side of each core back portion upper surface covering portion 32 c of the upper insulator 32 is the contact portion 45. These abutting portions 45 abut on the lower surfaces of the corresponding projecting portions 15b, respectively, so that the armature urging spring 41 is prevented from moving upward by the armature 3. In the base portion 14 around the base end (lower end) of the bearing holding portion 15 (lower spring support portion 14a), a portion corresponding to the portion directly below the protrusion portion 15b is used to mold the protrusion portion 15b with a mold. A molding hole 14b (see FIG. 9) is formed.

  A radially inner surface of the core back portion upper surface covering portion 32c of the upper insulator 32, a radially inner surface of the core back portion lower surface covering portion 33c of the lower insulator 33, and the contact portion 31f of the stator core 31 are a bearing holding portion. 15 is almost in contact with the outer peripheral surface of the armature 3, the armature 3 includes the core back portion upper surface covering portion 32 c and the core back portion lower surface covering portion 33 c on the radially inner surface and the contact portion 31 f (hereinafter referred to as the armature support portion). In other words, the bearing holding portion 15 is supported so as to be movable in the central axis direction. Further, the armature 3 is also supported by the armature support portion so as to be rotatable around the central axis J (around the bearing holding portion 15) with respect to the bearing holding portion 15. If the armature 3 is supported so as to be movable in the direction of the central axis with respect to the bearing holding portion 15, the armature support portion may be a central shaft described later on the inner peripheral surface portion of the insertion hole 30 of the armature 3. You may provide in any position except the direction channel | path part 46 and the circumferential direction channel | path part 47. FIG.

  Since the armature 3 is elastically supported with respect to the base portion 14 by the armature biasing spring 41, the vibration of the armature 3 generated when the rotor portion 2 (impeller 5) rotates is armature biased. Absorbed by the spring 41, vibration transmission to the base portion 14 is reduced. Thereby, the vibration of the motor, and hence the vibration as the axial fan A is reduced, and the noise of the motor (axial fan A) is also reduced.

  Here, a configuration for incorporating the armature 3 into the base portion 14 (bearing holding portion 15) will be described.

  The armature 3 is inserted into the insertion hole by moving the armature 3 from the distal end side (upper end side) of the bearing holding portion 15 to the one side (lower side) in the central axis direction with respect to the bearing holding portion 15. 30 is configured such that the bearing holding portion 15 is inserted. However, at the time of the insertion, the protrusion 15b does not interfere with the contact portion 45, and relative to the contact portion 45 from the one side (lower side) in the central axis direction to the other side (upper side). Need to move to. Therefore, in addition to the contact portions 45, the inner peripheral surface portions (four locations in the circumferential direction) of the insertion holes 30 of the armature 3 are arranged in the central axis direction on one side in the circumferential direction with respect to the contact portions 45. When the bearing holding portion 15 is inserted into the insertion hole 30, the protrusion 15 b can move relative to the contact portion 45 from the lower side to the upper side in the central axis direction. The central axial direction passage portion 46 and the upper end portion of the central axial direction passage portion 46 extend from the upper end of the central axial direction with respect to the contact portion 45 at the same position in the circumferential direction as the contact portion 45. The armature 3 that is disposed so as to extend in the circumferential direction and in which the protrusion 15b is positioned on the upper side in the central axis direction with respect to the contact portion 45 in the central axis direction passage portion 46 is By rotating the projection 15b, the central axis direction passage portion 46 To the side of the contact portion 45, and a circumferential passage 47 that allows to move relative to the abutting portion 45 is formed. In the present embodiment, the central axial passage portion 46 is formed by the inner peripheral surface portions of the through holes 31a, 32a, 33a of the stator core 31, the upper insulator 32, and the lower insulator 33 (the core back portion upper surface covering portion 32c, the core as described above). The back portion lower surface covering portion 33c and the contact portion 31f of the stator core 31 are each formed as a continuous portion in the direction of the central axis when the contact portion 31f is assumed to be one over the entire circumference. 45 and the circumferential passage portion 47 are formed in the inner peripheral surface portion of the through hole 32a of the upper insulator 32.

  In order to incorporate the armature 3 into the base portion 14 (bearing holding portion 15), first, the armature biasing spring 41 is set on the lower spring support portion 14a of the base portion 14. And the upper end part of the bearing holding part 15 is inserted in the lower end part of the insertion hole 30 of the armature 3 in the state which aligned the protrusion part 15b and the center axial direction channel | path part 46 in the circumferential direction. Subsequently, when the armature 3 is moved downward with respect to the bearing holding portion 15, the upper end portion of the armature biasing spring 41 eventually enters the upper spring support portion 33d, and then the armature biasing spring 41 is compressed. The armature 3 is moved downward with respect to the bearing holding portion 15. When the protrusion 15b is located above the contact portion 45 in the central axial passage portion 46 (a state where it is located at a portion connected to the circumferential passage portion 47) (see FIG. 10). 11), the armature 3 is moved to the bearing holding portion so that the protruding portion 15 b moves relative to the contact portion 45 from the central axial passage portion 46 toward the contact portion 45. 15 is rotated counterclockwise in FIG. 11 around the central axis J (see arrow in FIG. 11). By this rotation of the armature 3, the protrusion 15 b moves through the circumferential passage portion 47 from the central axial passage portion 46 toward the contact portion 45 relative to the contact portion 45, and eventually. The protrusion 15b is positioned at the same position in the circumferential direction as the contact portion 45 (see FIG. 4). Even if the operator removes his / her hand from the armature 3 in this state, the armature 3 does not come off the bearing holding portion 15 because the contact portion 45 contacts the lower surface of the projection 15b.

  Here, some force acts on the armature 3, and the protrusion 15 b passes through the circumferential passage portion 47 and falls from the same position in the circumferential direction to the contact portion 45 toward the central axial passage portion 46. If the armature 3 moves relative to the contact portion 45, the armature 3 may be detached from the bearing holding portion 15. In particular, when the rotor portion 2 is incorporated in the bearing holding portion 15, it is difficult for the operator to know whether or not the protrusion portion 15 b has shifted in the circumferential direction with respect to the contact portion 45.

  Therefore, in the present embodiment, the protruding portion 15b is configured to be hardly displaced in the circumferential direction with respect to the contact portion 45. Specifically, as shown in FIGS. 3, 4, and 7, the inner circumferential surface portion (four locations in the circumferential direction) of the insertion hole 30 of the armature 3, from the radially outer surface of the circumferential passage portion 47. A flexible claw portion 48 is formed so as to protrude from the circumferential passage portion 47. In the present embodiment, since the circumferential passage portion 47 is formed in the inner circumferential surface portion of the through hole 32a of the upper insulator 32, the claw portion 48 is formed by the inner circumferential surface portion (circumferential passage portion) of the through hole 32a of the upper insulator 32. 47 (radially outer surface).

  The claw portion 48 allows, by deformation, a first movement in which the projecting portion 15b moves relative to the contact portion 45 from the central axial direction passage portion 46 toward the contact portion 45 in the circumferential passage portion 47. On the other hand, in the circumferential passage 47, the protrusion 15b moves from the same position in the circumferential direction to the contact portion 45 toward the central axial passage 46 to move relative to the corresponding contact 45 (first movement (first). The movement is opposite to the movement). Specifically, the claw portion 48 extends so as to incline radially inward in the circumferential passage portion 47 toward the abutment portion 45 side, and the protrusion portion 15b is moved during the first movement of the protrusion portion 15b. The first movement is allowed by being bent and deformed radially outward by being pressed by 15b (see FIG. 11), while the projection 15b is moved by the claw 48 during the second movement of the projection 15b. The second movement is regulated by striking the tip. That is, during the first movement of the protrusion 15b, most of the force by which the protrusion 15b presses the claw 48 acts in the direction in which the protrusion 15b bends, while during the second movement of the protrusion 15b, Most of the force with which the projection 15b presses the claw 48 acts in the direction in which the projection 15b extends, and hardly acts in the direction in which the claw 48 bends. For this reason, the nail | claw part 48 does not bend and deform | transform at the time of the said 2nd movement of the projection part 15b, and, thereby, the said 2nd movement is controlled.

  Further, in the present embodiment, the portion on the contact portion 45 side at the time of the first movement on the tip surface of the projection portion 15b is an inclined surface 15c that is inclined radially inward toward the contact portion 45 side. ing. Due to the inclined surface 15c, the claw portion 48 is smoothly deformed and deformed by the pressing of the protrusion 15b, and the first movement of the protrusion 15b can be performed more smoothly.

  With this configuration, even if the protruding portion 15b attempts to move from the same position in the circumferential direction through the circumferential passage portion 47 to the side of the central axial passage portion 46, this movement (second movement). Is regulated by the claw portion 48. Such a claw 48 makes it difficult for the protrusion 15 b to be displaced in the circumferential direction with respect to the contact portion 45. On the other hand, since the first movement of the protrusion 15b is allowed by the deformation of the claw 48, the operator only has to rotate the armature 3 with respect to the bearing holder 15, and the base portion of the armature 3 14 can be easily assembled. In addition, since the movement resistance by the claw portion 48 disappears when the first movement of the protrusion 15b is completed, the operator can feel by touch that the assembly of the armature 3 into the base portion 14 is completed. In the present embodiment, the completion of the incorporation can be confirmed visually by the operator.

  The present invention is not limited to the above-described embodiment, and can be substituted without departing from the scope of the claims.

  For example, in the embodiment, the protrusion 15b is provided on the outer peripheral surface of the bearing holding portion 15 at the portion corresponding to the upper insulator 32 in the central axis direction, but instead, the protrusion 15b is provided on the outer peripheral surface of the bearing holding portion 15. The protrusion 15b may be provided in a portion corresponding to the lower insulator 33 in the central axis direction. An example of this configuration will be described with reference to FIGS.

  As shown in FIG. 12, the protruding portion 15 b is provided on the outer peripheral surface of the bearing holding portion 15 at a portion corresponding to the lower insulator 33 in the central axis direction, that is, in the vicinity of the base end (lower end) of the bearing holding portion 15. It has been. Correspondingly, as shown in FIG. 13, not the inner peripheral surface portion of the through hole 32 a of the upper insulator 32 but the inner peripheral surface portion of the through hole 33 a of the lower insulator 33, the contact portion 45, the central axis direction A passage portion 46, a circumferential passage portion 47 and a claw portion 48 are formed. In this example, the positional relationship in the circumferential direction between the contact portion 45 and the central axial direction passage portion 46 is opposite to that in the above embodiment. Moreover, although the inclined surface 15c like the said embodiment is not provided in the projection part 15b, it is preferable to provide the inclined surface similar to the inclined surface 15c.

  In the inner peripheral surface portions of the through holes 31 a and 32 a of the stator core 31 and the upper insulator 32, the central axial direction passage portion 46 as in the above embodiment is not formed, and the inner peripheral surfaces of the through holes 31 a and 32 a are An armature support portion is formed over the entire circumference.

  In the state in which the armature 3 is incorporated in the base portion 14, the projection 15 b is located at the same position in the circumferential direction as the contact portion 45 as shown in FIG. In FIG. 14, the description of the stator core 31 and the upper insulator 32 is omitted, and the stator core 31 and the upper insulator 32 are located above the lower insulator 33 in the actual assembled state. For this reason, unlike the above-described embodiment, the operator cannot visually confirm whether or not the assembly has been completed. However, as described above, there is no problem because the operator can feel that the assembly of the armature 3 to the base portion 14 is completed.

  The operation of incorporating the armature 3 into the base portion 14 is the same as in the above embodiment. That is, the upper end portion of the bearing holding portion 15 is inserted into the lower end portion of the insertion hole 30 of the armature 3 in a state where the protruding portion 15b and the central axial passage portion 46 are aligned in the circumferential direction, and then the armature 3 is moved downward with respect to the bearing holding portion 15. When the protruding portion is positioned above the contact portion in the central axial passage portion (see FIG. 15), the protruding portion 15b is located on the contact portion 45 side from the central axial passage portion 46. The armature 3 is rotated clockwise around the central axis J in FIG. 15 with respect to the bearing holding portion 15 so as to move relative to the corresponding contact portion 45 (see the arrow in FIG. 15). . The movement (first movement) of the projection 15b at this time is allowed by the deformation of the claw 48. And by the rotation of the armature 3, the protrusion 15b is positioned at the same position in the circumferential direction as the contact portion 45 (see FIG. 14). Even if the protrusion 15 b tries to move from the same position in the circumferential direction as the contact portion 45 toward the central axis passage portion 46, this movement (second movement) is restricted by the claw portion 48.

  Accordingly, in this example as well, as in the above-described embodiment, the protrusion 15b is not easily displaced in the circumferential direction with respect to the contact portion 45 while maintaining the ease of assembling the armature 3 into the base portion 14. Can do. Unlike the above-described embodiment, it is not necessary to form the central axial passage portion 46 in the stator core 31, whereby the contact portion 31 f where the entire inner peripheral surface of the stator core 31 substantially contacts the outer peripheral surface of the bearing holding portion 15. As a result, the inner peripheral surface of the stator core 31 is free from irregularities, and the volume of the stator core 31 can be increased.

  Moreover, in the said embodiment, although the four protrusion parts 15b were provided in the outer peripheral surface of the bearing holding part 15, the number of the protrusion parts 15b may be how many, for example, may be one. And the contact part 45, the center axial direction channel | path part 46, the circumferential direction channel | path part 47, and the nail | claw part 48 should just provide the same number as the projection part 15b corresponding to the projection part 15b. Here, from the viewpoint of regulating the upward movement of the armature 3 with a good balance, the number of the protrusions 15b is preferably plural. Further, it is not desirable to increase the number of protrusions 15b from the viewpoint of manufacturing the bearing holding portion 15 and the insulator or the like in which the claw portion 48 is formed. For this reason, it is most preferable to provide three or four protrusions 15b.

  Furthermore, in the said embodiment, although the example which applied the motor 1 of this invention to the axial flow fan A was shown, the motor 1 of this invention is applied also to ventilation fans (for example, centrifugal fan) other than the axial flow fan A. And can be applied to devices driven by the motor 1 other than the blower fan.

  The above embodiments are merely examples, and the scope of the present invention should not be interpreted in a limited manner. The scope of the present invention is defined by the scope of the claims, and all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

A Axial fan 1 Motor 2 Rotor part 3 Armature 5 Impeller 8 Shaft 14 Base part 15 Bearing holding part 25 Rotor magnet 30 Insertion hole 31 Stator core 31a Through hole 32 Upper insulator 32a Through hole 33 Lower insulator 33a Through hole 41 Armature Biasing spring (elastic member)
45 Abutting portion 46 Center axis direction passage portion 47 Circumferential direction passage portion 48 Claw portion

Claims (6)

A motor,
A rotor portion having a shaft and a rotor magnet and rotating about the central axis of the shaft;
An insertion hole extending in the central axis direction is provided in the central portion, and is disposed so as to face the rotor magnet in the radial direction of the rotor portion, and rotates the rotor portion between the rotor magnet and the rotor magnet. An armature configured to generate torque to cause,
A base portion for supporting the armature, disposed on one side of the central axis direction with respect to the armature;
It is provided on the armature side surface of the base portion so as to extend toward the other side in the central axis direction while being inserted through the insertion hole, and the armature is extended in the central axis direction on the outer peripheral surface. A substantially cylindrical bearing holding portion that supports the shaft in a movable manner and rotatably supports the shaft via a bearing member on an inner peripheral surface;
An elastic member that biases the armature toward the other side in the central axis direction with respect to the base portion;
The armature is inserted into the insertion hole by moving the armature from the distal end side of the bearing holding portion to the one side in the central axis direction with respect to the bearing holding portion. Configured to be in a state,
The outer peripheral surface of the bearing holding portion is provided with a protruding portion that protrudes radially outward,
In the inner peripheral surface portion of the insertion hole of the armature,
An abutting portion that abuts against the protrusion from the one side in the central axis direction by the biasing of the elastic member;
It is arranged to extend in the central axis direction on one side in the circumferential direction with respect to the contact portion, and when the bearing holding portion is inserted through the insertion hole, the projection portion is A central axial passage section that allows relative movement from the one side in the central axial direction to the other side;
The protrusion is disposed so as to extend in the circumferential direction from the central axial passage portion in the circumferential direction at the same position in the circumferential direction as the contact portion and over the other side position in the central axial direction with respect to the corresponding contact portion. The protrusion is formed by rotating the armature in a state where the portion is located on the other side in the central axis direction with respect to the contact portion in the central axis passage portion, with respect to the bearing holding portion. A circumferential passage portion that allows the portion to move relative to the contact portion from the central axial passage portion toward the contact portion;
It is arranged so as to protrude from the radially outer surface of the circumferential passage portion to the circumferential passage portion, and the projection portion is relative to the contact portion from the central axial passage portion to the contact portion side. The first movement is allowed to move by deformation, while the protrusion is moved relative to the corresponding contact portion from the same position in the circumferential direction as the contact portion toward the central axial passage portion. 2 flexible claws that restrict movement;
Is formed, motor. The motor according to claim 1, wherein
The claw portion extends so as to incline radially inward in the circumferential passage portion toward the abutment portion, and is pressed by the protrusion during the first movement of the protrusion. The first movement is allowed by bending and deforming more radially outward, while the second movement of the protrusion is caused by the protrusion protruding on the tip of the claw when the protrusion is in the second movement. A motor that is configured to regulate. The motor according to claim 2, wherein
A motor in which a portion of the tip end surface of the projecting portion on the side of the contact portion at the time of the first movement is inclined radially inward toward the contact portion side. The motor according to claim 1, wherein
The armature includes a stator core formed of a magnetic material, a first insulator that covers the one side portion of the stator core in the central axis direction, and a first insulator that covers the other side portion of the stator core in the central axis direction. 2 insulators,
The protrusion is provided in a portion corresponding to the second insulator in the central axis direction on the outer peripheral surface of the bearing holding portion,
The stator core, the first insulator, and the second insulator are each provided with a through hole as the insertion hole,
The central axial direction passage portions are respectively formed on the inner peripheral surface portions of the through holes of the stator core, the first insulator, and the second insulator,
The motor, wherein the contact portion, the circumferential passage portion, and the claw portion are formed on an inner peripheral surface portion of the through hole of the second insulator. The motor according to claim 1, wherein
The armature includes a stator core formed of a magnetic material, a first insulator that covers the one side portion of the stator core in the central axis direction, and a first insulator that covers the other side portion of the stator core in the central axis direction. 2 insulators,
The protrusion is provided on a portion of the outer peripheral surface of the bearing holding portion corresponding to the first insulator in the central axis direction.
The stator core, the first insulator, and the second insulator are each provided with a through hole as the insertion hole,
The motor, wherein the contact portion, the central axial passage portion, the circumferential passage portion, and the claw portion are formed on an inner peripheral surface portion of the through hole of the first insulator. A blower fan comprising a motor and an impeller rotated by the motor,
The motor is
A rotor portion having a shaft and a rotor magnet, and rotating around the central axis by rotating about the central axis of the shaft;
An insertion hole extending in the central axis direction is provided in the central portion, and is disposed so as to face the rotor magnet in the radial direction of the rotor portion, and rotates the rotor portion between the rotor magnet and the rotor magnet. An armature configured to generate torque to cause,
A base portion for supporting the armature, disposed on one side of the central axis direction with respect to the armature;
It is provided on the armature side surface of the base portion so as to extend toward the other side in the central axis direction while being inserted through the insertion hole, and the armature is extended in the central axis direction on the outer peripheral surface. A substantially cylindrical bearing holding portion that supports the shaft in a movable manner and rotatably supports the shaft via a bearing member on an inner peripheral surface;
An elastic member that biases the armature toward the other side in the central axis direction with respect to the base portion;
With
The armature is inserted into the insertion hole by moving the armature from the distal end side of the bearing holding portion to the one side in the central axis direction with respect to the bearing holding portion. Configured to be in a state,
The outer peripheral surface of the bearing holding portion is provided with a protruding portion that protrudes radially outward,
In the inner peripheral surface portion of the insertion hole of the armature,
An abutting portion that abuts against the protrusion from the one side in the central axis direction by the biasing of the elastic member;
It is arranged to extend in the central axis direction on one side in the circumferential direction with respect to the contact portion, and when the bearing holding portion is inserted through the insertion hole, the projection portion is A central axial passage section that allows relative movement from the one side in the central axial direction to the other side;
The protrusion is disposed so as to extend in the circumferential direction from the central axial passage portion in the circumferential direction at the same position in the circumferential direction as the contact portion and over the other side position in the central axial direction with respect to the corresponding contact portion. The protrusion is formed by rotating the armature in a state where the portion is located on the other side in the central axis direction with respect to the contact portion in the central axis passage portion, with respect to the bearing holding portion. A circumferential passage portion that allows the portion to move relative to the contact portion from the central axial passage portion toward the contact portion;
It is arranged so as to protrude from the radially outer surface of the circumferential passage portion to the circumferential passage portion, and the projection portion is relative to the contact portion from the central axial passage portion to the contact portion side. The first movement is allowed to move by deformation, while the protrusion is moved relative to the corresponding contact portion from the same position in the circumferential direction as the contact portion toward the central axial passage portion. 2 flexible claws that restrict movement;
Is formed, blower fan.

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