Motor and blower

Abstract

To provide a motor capable of improving a coupling strengh between a bearing and a bearing housing part.SOLUTION: A motor comprises: a rotor that can be rotated by using a center shaft extended to a shaft direction as a center; a bearing 32 that rotatably supports a rotor to a radial direction inner side; a bearing housing part that houses the bearing to the radial direction inner side; and an annular-shape member 34 that is arranged over at least one part of a whole region of a peripheral direction. The bearing includes a first groove 320 that is concaved toward the radial direction inner side in an outer peripheral surface, and is arranged to at least one part of the whole region of the peripheral direction. The bearing housing part includes a second groove 310 that is concaved toward the radial direction inner side in an inner peripheral side surface, and is arranged over at least one part of the whole region of the peripheral direction. One part of the annular-shaped member is housed in the first groove. An another one part of the annular-shaped member is housed to the second groove.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a motor and a blower device.

Background Art

[0002] Conventionally, a motor including a bearing portion that rotatably supports a rotating portion and a base portion has been known. The bearing portion is fixed to the inner peripheral surface of a rising portion provided on the base portion (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above motor, the bearing portion is fixed to the rising portion by adhesion. However, in such a fixing method, when an impact is applied to the motor, damage accumulates in the adhesive portion, which has an adverse effect, and there is a risk that the bearing portion may come off from the rising portion.

[0005] An object of the present disclosure is to provide a motor that improves the bonding strength between a bearing and a bearing housing portion.

Means for Solving the Problems

[0006] Exemplary motors of the present disclosure include a rotor rotatable about a central axis extending axially, a bearing that rotatably supports the rotor inward in the radial direction, a bearing housing portion that houses the bearing inward in the radial direction, and an annular member disposed over at least a part of the entire circumferential direction. The bearing has a first groove that is recessed inward in the radial direction on the outer peripheral side surface and is disposed over at least a part of the entire circumferential direction. The bearing housing portion has a second groove that is recessed outward in the radial direction on the inner peripheral side surface and is disposed over at least a part of the entire circumferential direction. A part of the annular member is housed in the first groove. Another part of the annular member is housed in the second groove.

[0007] Exemplary blowers of the present disclosure include the above-described motor and a rotor blade rotatable about the central axis together with the rotor of the motor.

Advantages of the Invention

[0008] According to the exemplary motor of the present disclosure, the coupling strength between the bearing and the bearing housing portion can be improved.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14A

Figure 14B

Figure 14C

Figure 14D

Figure 15

DETAILED DESCRIPTION OF THE INVENTION

[0010] Exemplary embodiments of the present disclosure will be described below with reference to the drawings.

[0011] In this specification, in the blower 100 and the motor 101, the direction parallel to the central axis CA is referred to as the "axial direction". Among the axial directions, the direction from the base portion 3 to the rotor hub 10, which will be described later, is referred to as the "one axial direction Da", and the direction from the rotor hub 10 to the base portion 3 is referred to as the "other axial direction Db". Further, the direction orthogonal to the central axis CA is referred to as the "radial direction", and the rotational direction centered on the central axis CA is referred to as the "circumferential direction". Among the radial directions, the direction approaching the central axis CA is referred to as the "inward radial direction Di", and the direction away from the central axis CA is referred to as the "outward radial direction Do".

[0012] Also, in the positional relationship between any one of the azimuth, line, and plane and any other one, "parallel" includes not only the state where the two do not intersect at all no matter how far they extend, but also the state where they are substantially parallel. Further, "perpendicular" and "orthogonal" each include not only the state where the two intersect at 90 degrees to each other, but also the state where they are substantially perpendicular and the state where they are substantially orthogonal. That is, "parallel", "perpendicular", and "orthogonal" each include the state where there is an angular deviation within the extent that does not deviate from the gist of the present disclosure in the positional relationship between the two.

[0013] Note that these are merely names used for the purpose of explanation and are not intended to limit the actual positional relationship, direction, and name, etc.

[0014] <1. Configuration of Blower> FIG. 1 is a cross-sectional view showing the configuration of the blower 100 according to an exemplary embodiment of the present disclosure. The blower 100 of the present embodiment is an axial flow fan and sends out the airflow sucked from the one axial direction Da to the other axial direction Db. However, this example does not exclude the configuration where the blower 100 is other than an axial flow fan. For example, the blower 100 may be a blower fan or a centrifugal fan.

[0015] As shown in FIG. 1, the blower 100 includes a motor 101 and an impeller 102. The impeller 102 has a moving blade 102A. That is, the blower 100 includes the motor 101 and the moving blade 102A. The moving blade 102A is rotatable about the central axis CA together with the rotor 1 of the motor 101 described later. In the present embodiment, a plurality of moving blades 102A are arranged radially outward of the rotor 1 and are arranged in the circumferential direction. When the motor 101 rotates the moving blade 102A in the circumferential direction, the air flow flows in the axial direction.

[0016] The motor 101 includes a rotor 1, a stator 2, and a stationary part 3. The rotor 1 is rotatable about the central axis CA extending in the axial direction. The rotor 1 has a rotor hub 10, a retaining part 11, and a magnet 12.

[0017] The rotor hub 10 has a shaft part 10A, a disk part 10B, a wall part 10C, and a wall part 10D. The shaft part 10A extends in the axial direction and is rotatably supported around the central axis CA by a bearing 32 described later. The disk part 10B is a disk-shaped member that extends radially on one axial side of the shaft part 10A.

[0018] The wall part 10C extends from the outer peripheral edge of the disk part 10B to the other axial side and is arranged in the circumferential direction. That is, the wall part 10C forms a cylinder centered on the central axis CA. The impeller 102 is fixed to the radially outer surface of the wall part 10C.

[0019] The wall part 10D extends from the disk part 10B to the other axial side radially inward of the wall part 10C and is arranged in the circumferential direction. That is, the wall part 10D forms a cylinder centered on the central axis CA.

[0020] The retaining part 11 is fixed to the end of the shaft part 10A on the other axial side by screwing. The retaining part 11 is used to prevent the shaft part 10A from coming off the bearing 32 in the axial direction on one side.

[0021] The magnet 12 is disposed on the radially inner surface of the wall portion 10C and faces the stator 2 (particularly, the stator core 21 described later) in the radial direction. The magnet 12 is disposed radially outward of the stator 2 (particularly the stator core 21) and surrounds the stator 2 (particularly the stator core 21). In the magnet 12, a plurality of different magnetic poles (S pole, N pole) are arranged alternately in the circumferential direction.

[0022] The stator 2 rotates the rotor 1 by the magnetic flux generated by energization. As shown in FIG. 1 The stator 2 has a stator core 21, a coil portion 22, and an insulator (not shown).

[0023] The stator core 21 is an annular magnetic body surrounding the central axis CA, and in this embodiment, it is a laminate formed by stacking plate-shaped electromagnetic steel sheets extending in the radial direction in the axial direction. The stator core 21 is fixed to the radially outer surface of the stator holder 311 described later. Further, the stator core 21 has slots (not shown). The slots penetrate the stator core 21 in the axial direction and are arranged in a plurality in the circumferential direction. A plurality of coil portions 22 arranged in the circumferential direction are disposed on the stator core 21. The insulator has electrical insulation properties and is disposed on the surface of the stator core 21 (particularly both axial end faces and the inner surfaces of the slots, etc.).

[0024] The coil portion 22 is a member in which a conducting wire is arranged in a coil shape on the stator core 21 via an insulator. The conducting wire is, for example, an enamel-coated copper wire, a metal wire coated with an electrical insulating member, etc., and forms the coil portion 22 by being wound around the teeth (not shown) between the circumferentially adjacent slots of the stator core 21. When a drive current is supplied to each coil portion 22, the stator 2 is excited to drive the rotor 1.

[0025] The stationary part 3 includes a base part 31, a bearing 32, and a cap 33. The base part 31 has a stator holder 311 that protrudes on one side in the axial direction. The stator holder 311 is formed in a cylindrical shape centered on the central axis CA. The stator holder 311 supports the stator 2. A through hole H is provided that axially penetrates from the end face on the other side in the axial direction of the base part 31 to the end face on one side in the axial direction of the stator holder 311.

[0026] The stator holder 311 has a cylindrical part 311A on the side that is the farthest in the axial direction on the other side. The stator holder 311 has a bearing housing part 311B provided on one side in the axial direction of the cylindrical part 311A. Here, FIG. 2 is an enlarged view around the shaft part 10A in FIG. 1. The inner diameter D1 of the cylindrical part 311A, the inner diameter D2 of the bearing housing part 311B, and the inner diameter D3 of a wall part W (described later) provided in the bearing housing part 311B have the relationship D1 < D2 < D3.

[0027] The cap 33 is disposed on the end face on the other side in the axial direction inside the radial direction of the bearing housing part 311B. The bearing 32 extends in the axial direction and is cylindrical with the central axis CA as the center, and is configured as a sleeve bearing. The bearing 32 is housed inside the radial direction of the bearing housing part 311B and is disposed on one side in the axial direction of the cap 33. That is, the motor 101 has a bearing housing part 311B that houses the bearing 32 inside the radial direction. The cap 33 suppresses oil leakage inside the bearing 32.

[0028] The bearing 32 rotatably supports the shaft part 10A inside the radial direction. That is, the motor 101 has a bearing 32 that rotatably supports the rotor 1 inside the radial direction.

[0029] As shown in FIG. 2, the bearing 32 functions as a radial hydrodynamic bearing. Oil is disposed between the shaft portion 10A and the bearing 32. A radial hydrodynamic groove 41 for generating hydrodynamic pressure in the oil intervening therebetween is disposed on at least one of the radially outer surface of the shaft portion 10A and the radially inner surface of the bearing 32. The radial hydrodynamic groove 41 is configured, for example, in a herringbone shape. When the shaft portion 10A rotates, hydrodynamic pressure is generated in the fluid therebetween by the radial hydrodynamic groove 41. Due to this hydrodynamic pressure, the space between the bearing 32 and the shaft portion 10A is separated. Thereby, the rotating shaft portion 10A is supported in a non-contact state with the bearing 32.

[0030] Further, the bearing 32 also functions as a thrust hydrodynamic bearing. Oil is disposed between the disk portion 10B and the bearing 32. A thrust hydrodynamic groove 42 for generating hydrodynamic pressure in the oil intervening therebetween is disposed on at least one of the other axial side surface of the disk portion 10B and the one axial side surface of the bearing 32. Also, oil is disposed between the retaining portion 11 and the bearing 32. A thrust hydrodynamic groove 43 for generating hydrodynamic pressure in the oil intervening therebetween is disposed on at least one of the one axial side surface of the retaining portion 11 and the other axial side surface of the bearing 32.

[0031] The thrust hydrodynamic grooves 42 and 43 are configured, for example, in a herringbone shape or a spiral shape. When the shaft portion 10A rotates, hydrodynamic pressure is generated in the fluid therebetween by the thrust hydrodynamic grooves 42 and 43. Due to this hydrodynamic pressure, the spaces between the bearing 32 and the disk portion 10B and between the bearing 32 and the retaining portion 11 are separated. Thereby, the rotating disk portion 10B and the retaining portion 11 are supported in a non-contact state with the bearing 32.

[0032] That is, the motor 101 includes at least one of thrust dynamic pressure grooves 42 and 43 provided at a location where the bearing 32 and the rotor 1 face each other in the axial direction, and a radial dynamic pressure groove 41 provided at a location where the bearing 32 and the rotor 1 face each other in the radial direction. As will be described later, in this embodiment, since the bonding strength between the bearing 32 and the bearing housing portion 311B is improved, it is possible to prevent the bearing 32 and the rotor 1 from coming off the bearing housing portion 311B due to an impact and the dynamic pressure grooves from being deformed.

[0033] Further, as shown in FIG. 2, the bearing housing portion 311B has a wall portion W at one end in the axial direction. The wall portion W is cylindrical with the central axis CA as the center and is arranged in the circumferential direction. The wall portion W faces the bearing 32 in the radial direction. The wall portion 10D is accommodated in a gap S extending in the circumferential direction between the bearing 32 and the wall portion W. That is, the rotor 1 has a wall portion 10D arranged in the circumferential direction in the radial gap between the bearing 32 and the wall portion W. A labyrinth structure is formed by the bearing 32, the bearing housing portion 311B, and the wall portion W, and oil leakage is suppressed. Since the bonding strength between the bearing 32 and the bearing housing portion 311B is improved as will be described later, the axial length of the location where the bearing 32 is accommodated in the bearing housing portion 311B can be shortened, and it becomes easier to form a labyrinth structure.

[0034] <2. Bonding Structure between Bearing and Bearing Housing Portion> Next, the bonding structure between the bearing 32 and the bearing housing portion 311B will be described. An annular member 34 (FIG. 1) is used for bonding the bearing 32 and the bearing housing portion 311B. The annular member 34 is included in the stationary portion 3. That is, the motor 101 includes the annular member 34. The annular member 34 has a cut 341 in a part of the entire circumferential direction as shown in FIG. 3. That is, the annular member 34 is configured as a so-called C-ring. Thereby, as will be described later, when assembling the above bonding structure, it becomes easy to attach the annular member 34 to the bearing 32 or the bearing housing portion 311B by widening or narrowing the cut 341.

[0035] However, the annular member 34 may be formed over the entire circumferential direction. That is, the annular member 34 only needs to be arranged over at least a part of the entire circumferential direction.

[0036] <Example 1 of the coupling structure> FIG. 4 is a diagram showing a first configuration example of the coupling structure. As shown in FIG. 4, the bearing 32 has a first groove 320 that is recessed radially inward on the outer peripheral surface, and the bearing housing portion 311B has a second groove 310 that is recessed radially outward on the inner peripheral surface. The first groove 320 and the second groove 310 are each arranged over the entire circumferential direction. Note that the first groove 320 and the second groove 310 may each be arranged over a part of the entire circumferential direction. That is, the first groove 320 and the second groove 310 only need to be arranged over at least a part of the entire circumferential direction.

[0037] FIG. 5 is an enlarged view of the periphery of the annular member 34 in FIG. 4. As such, the first groove 320 has inclined portions 320A and 320B in a cross-sectional view. Note that the "inclined portion" is inclined with respect to the axial direction. In the inclined portion 320A, the radial depth decreases as it goes toward one side in the axial direction, and in the inclined portion 320B, the radial depth decreases as it goes toward the other side in the axial direction. The second groove 310 has inclined portions 310A and 310B in a cross-sectional view. In the inclined portion 310A, the radial depth decreases as it goes toward one side in the axial direction, and in the inclined portion 310B, the radial depth decreases as it goes toward the other side in the axial direction.

[0038] As shown in FIG. 5, the cross-section when cut along a cutting plane including the central axis CA of the annular member 34 is circular. The radially inner half of the annular member 34 is arranged in the first groove 320, and the radially outer half of the annular member 34 is arranged in the second groove 310. That is, a part of the annular member 34 is accommodated in the first groove 320, and another part of the annular member 34 is accommodated in the second groove 310.

[0039] A method of assembling a first configuration example of such a coupling structure will be described with reference to FIGS. 6 and 7. In FIGS. 6 and 7, the hatching indicating the cross section is omitted for convenience. FIG. 6 is a diagram showing a first example of the above assembly method. Here, by narrowing the cut 341 of the annular member 34, the annular member 34 is inserted into the bearing housing portion 311B from one axial side inward in the radial direction, and the annular member 34 is accommodated in the second groove 310. At this time, the annular member 34 is fixed to the second groove 310 by an elastic force. Since the annular member 34 having a circular cross section is positioned in contact with the inclined portions 310A and 310B respectively, positioning is easy. Next, as shown in FIG. 6, when the bearing 32 is inserted into the bearing housing portion 311B from one axial side inward in the radial direction, the annular member 34 is accommodated in the first groove 320. As a result, the state shown in FIG. 5 is obtained and the assembly is completed. Thereby, even if the bearing 32 tries to come out to one axial side due to an impact or the like, the inclined portion 320B catches on the annular member 34, so that the bearing 32 is prevented from coming out.

[0040] FIG. 7 is a diagram showing a second example of the above assembly method. Here, by widening the cut 341 of the annular member 34, the annular member 34 is inserted into the bearing 32 from the other axial side outward in the radial direction, and the annular member 34 is accommodated in the first groove 320. At this time, the annular member 34 is fixed to the first groove 320 by an elastic force. Since the annular member 34 having a circular cross section is positioned in contact with the inclined portions 320A and 320B respectively, positioning is easy. Next, as shown in FIG. 7, when the bearing 32 is inserted into the bearing housing portion 311B from one axial side inward in the radial direction, the annular member 34 is accommodated in the second groove 310. As a result, the state shown in FIG. 5 is obtained and the assembly is completed. Thereby, even if the bearing 32 tries to come out to one axial side due to an impact or the like, the annular member 34 catches on the inclined portion 310A, so that the bearing 32 is prevented from coming out.

[0041] Thus, in this embodiment, the engagement between the annular member 34 and each of the first groove 320 and the second groove 310 suppresses the axial detachment of the bearing 32. Therefore, the coupling strength between the bearing 32 and the bearing housing portion 311B is improved. In this way, since the coupling strength is improved, the moving blade 102A (FIG. 1) is suppressed from coming off the bearing housing portion 311B together with the bearing 32 and the rotor 1.

[0042] Further, since the cross-section of the annular member 34 is circular, when the annular member 34 is accommodated in the second groove 310 as shown in FIG. 6, or when the annular member 34 is accommodated in the first groove 320 as shown in FIG. 7, there is less friction, making it easier to move the annular member 34 and easier to arrange the annular member 34 in the first groove 320 or the second groove 310.

[0043] Also, in at least one of the first groove 320 and the second groove 310, the radial depth of the second groove 310 decreases toward one axial direction (inclined portion 310A), and the radial depth of the first groove 320 decreases toward the other axial direction (inclined portion 320B). Since the radial depth of the second groove 310 decreases toward one axial direction, when the annular member 34 is accommodated in the second groove 310 as shown in FIG. 6 and the annular member 34 is moved to the second groove 310, the annular member 34 automatically slides on the second groove 310 (inclined portion 310A) and is accommodated in the second groove 310. Similarly, since the radial depth of the first groove 320 decreases toward the other axial direction, when the annular member 34 is accommodated in the first groove 320 as shown in FIG. 7 and the annular member 34 is moved to the first groove 320, the annular member 34 automatically slides on the first groove 320 (inclined portion 320B) and is accommodated in the first groove 320. Therefore, it becomes easier to arrange the annular member 34 in the first groove 320 or the second groove 310. Also, deformation of the first groove 320 or the second groove 310 due to impact is suppressed.

[0044] <2-2. Second Configuration Example of the Coupling Structure> FIG. 8 is a diagram showing a second configuration example of the above-described coupling structure. FIG. 9 is an enlarged view of the periphery of the annular member 34 in FIG. 8. Thus, the first groove 320 has inclined portions 320A and 320B in a cross-sectional view, similar to the first configuration example described above. On the other hand, different from the first configuration example described above, the second groove 310 has an axial portion 310C in addition to the inclined portions 310A and 310B in a cross-sectional view. The axial portion 310C extends along the axial direction. One axial end of the axial portion 310C is connected to the other axial end of the inclined portion 310A. The other axial end of the axial portion 310C is connected to the one axial end of the inclined portion 310B. One axial end of the inclined portion 310A is located on the one axial side with respect to the one axial end of the inclined portion 320A. The other axial end of the inclined portion 310B is located on the other axial side with respect to the other axial end of the inclined portion 320B. Thereby, the axial length of the axial portion 310C is ensured to be long. In the axial portion 310C, the radial depth is constant in the axial direction.

[0045] The annular member 34 is fixed to the axial portion 310C by an elastic force. Thereby, when the inclined portion 320B catches on the annular member 34, the axial movement of the bearing 32 to one side is suppressed. Further, in this configuration example, as shown in FIG. 9, the first groove 320 is composed of the inclined portions 320A and 320B, and the second groove 310 is composed of the axial portion 310C in addition to the inclined portions 320A and 320B. If both the first groove 320 and the second groove 310 are composed of the inclined portions 320A and 320B as in the first configuration example (FIG. 5) described above, both the first groove 320 and the second groove 310 will be configured with an emphasis on positioning, but there is also a possibility that the positioning effects will interfere with each other. Therefore, in this configuration example, by providing the axial portion 310C in the second groove 310, the movement of the annular member 34 is allowed to a certain extent, and the assembly can be facilitated. In particular, since the axial length of the axial portion 310C is ensured to be long as described above, the effect of allowing the movement is increased.

[0046] <2-3. Third Configuration Example of the Coupling Structure> FIG. 10 is a diagram showing a third configuration example of the above-described coupling structure. FIG. 11 is an enlarged view of the periphery of the annular member 34 in FIG. 10. Thus, similar to the second configuration example described above, the second groove 310 has inclined portions 310A and 310B and an axial portion 310C in a cross-sectional view. On the other hand, different from the second configuration example, the first groove 320 has an axial portion 320C in addition to the inclined portions 320A and 320B in a cross-sectional view. Note that one axial end of each of the inclined portion 320A and the inclined portion 310A coincides, and one axial end of each of the inclined portion 320B and the inclined portion 310B coincides.

[0047] The annular member 34 is different from the first and second configuration examples. Specifically, the cross-section when cut along a cutting plane including the central axis CA of the annular member 34 is rectangular. One side of the annular member 34 on the inner side in the radial direction contacts the axial portion 320C, and one side of the annular member 34 on the outer side in the radial direction contacts the axial portion 310C. Thereby, the contact area between the annular member 34 and the first groove 320 or the second groove 310 increases, and the coupling strength between the bearing 32 and the bearing housing portion 311B is further improved.

[0048] Further, the annular member 34 is fixed to one of the axial portions 320C or 310C by an elastic force. Thereby, when the annular member 34 is caught by the inclined portion 310A or when the inclined portion 320B is caught by the annular member 34, the axial movement of the bearing 32 to one side in the axial direction is suppressed.

[0049] <2-4. Fourth Configuration Example of the Coupling Structure> FIG. 12 is a diagram showing a fourth configuration example of the above-described coupling structure. FIG. 13 is an enlarged view of the periphery of the annular member 34 in FIG. 12. The annular member 34 is circular in a cross-sectional view. The first groove 320 has inclined portions 320A and 320B in a cross-sectional view. The second groove 310 has inclined portions 310A and 310B and an axial portion 310C in a cross-sectional view. One axial end of the inclined portion 310A is located on the other axial side than one axial end of the inclined portion 320A. One axial end of the inclined portion 310B is located on the other axial side than one axial end of the inclined portion 320B.

[0050] Here, the assembly method of the above-described fourth configuration example will be described with reference to FIGS. 14A to 14D. In FIGS. 14A to 14D, the hatching indicating the cross section is omitted for convenience. First, as shown in FIG. 14A, the annular member 34 is inserted into the radial inner side of the axial accommodating portion 311B from one axial side, and the annular member 34 is accommodated in the second groove 310. At this time, as shown in FIG. 14A, the annular member 34 is arranged in contact with the inclined portion 310B in the natural length state.

[0051] Next, the bearing 32 is inserted into the radial inner side of the bearing accommodating portion 311B from one axial side. Then, as shown in FIG. 14B, the radially outer surface of the other axial end portion of the bearing 32 comes into contact with the annular member 34. When the insertion of the bearing 32 is further advanced, as shown in FIG. 14C, the annular member 34 expands radially outward, and the annular member 34 is disposed between the radially outer surface of the bearing 32 and the second groove 310. When the insertion of the bearing 32 is further advanced, the first groove 320 overlaps with the second groove 310, and finally the state shown in FIG. 14D is obtained. Here, in detail, as shown in FIG. 13, the annular member 34 is in contact with the inclined portions 320A, 320B and the inclined portion 310A in the natural length state, and the annular member 34 is pressed against the bearing 32 by the inclined portion 310A. Thereby, the annular member 34 is caught by the inclined portion 310A, suppressing the bearing 32 from coming off to one axial side. In particular, since the inclined portions 310A and 320B sandwich the annular member 34, when the bearing 32 tries to come off to one axial side, the inclined portion 310A functions as a wall that suppresses the coming off.

[0052] <3. Modification Example> In the above-described first to fourth configuration examples, at least a part of the first groove 320 and at least a part of the second groove 310 overlap in the axial direction. Thereby, the axial thickness of the annular portion 34 is reduced, and the annular member 34 can be miniaturized. However, not limited thereto, the first groove 320 and the second groove 310 may not overlap in the axial direction. That is, the entire axial region of the first groove 320 and the entire axial region of the second groove 310 may be displaced in the axial direction.

[0053] The configuration according to such a modification is shown in FIG. 15. FIG. 15 is an enlarged view showing a cross-sectional configuration around the annular member 34. Thus, the first groove 320 and the second groove 310 do not overlap in the axial direction. The annular member 34 has annular portions 34A and 34B and a connecting portion 34C. The annular portion 34A is disposed at one axial end of the annular member 34 and is circumferentially disposed about the central axis CA. The annular portion 34B is disposed at the other axial end of the annular member 34 and is circumferentially disposed about the central axis CA. The connecting portion 34C axially connects the radially outer end of the annular portion 34A and the radially inner end of the annular portion 34B. The annular portion 34A is received in the first groove 320, and the annular portion 34B is received in the second groove 310. The connecting portion 34C is disposed in a gap SP between the radially outer surface of the bearing 32 and the radially inner surface of the bearing housing portion 311B.

[0054] <4. Others> The embodiments of the present disclosure have been described above. It should be noted that the scope of the present disclosure is not limited to the above-described embodiments. The present disclosure can be implemented with various modifications to the above-described embodiments without departing from the gist of the invention. Also, the matters described in the above-described embodiments can be arbitrarily combined as appropriate within a range that does not cause contradictions.

[0055] <Appendix> As described above, the motor according to one aspect of the present disclosure a rotor rotatable about a central axis extending in the axial direction, a bearing that rotatably supports the rotor inward in the radial direction, a bearing housing portion that houses the bearing inward in the radial direction, an annular member disposed over at least a part of the entire circumferential direction, and the bearing has a first groove that is recessed inward in the radial direction on the outer peripheral surface and is disposed over at least a part of the entire circumferential direction, the bearing housing portion has a second groove that is recessed outward in the radial direction on the inner peripheral surface and is disposed over at least a part of the entire circumferential direction, a part of the annular member is received in the first groove, Another part of the annular member is configured to be received in the second groove (first configuration).

[0056] Also, in the first configuration, at least a part of the first groove and at least a part of the second groove may be configured to overlap in the axial direction (second configuration).

[0057] Also, in the first or second configuration, the annular member may be configured to have a cut in a part of the entire circumferential direction (third configuration).

[0058] Also, in any of the first to third configurations, in at least one of the first groove and the second groove, the radial depth of the second groove decreases as it goes in one axial direction, and the radial depth of the first groove decreases as it goes in the other axial direction. Such a configuration may be adopted (fourth configuration).

[0059] Also, in any of the first to fourth configurations, the cross-section when cut along a cutting plane including the central axis of the annular member may be circular (fifth configuration).

[0060] Also, in any of the first to fourth configurations, the cross-section when cut along a cutting plane including the central axis of the annular member may be rectangular (sixth configuration).

[0061] Also, in any of the first to sixth configurations, the bearing housing portion has a first wall portion that is arranged circumferentially and radially opposed to the bearing at one axial end portion, The rotor may be configured to have a second wall portion that is arranged circumferentially in the radial gap between the bearing and the first wall portion (seventh configuration).

[0062] Also, in any of the first to seventh configurations, it may be configured to include at least one of a thrust dynamic pressure groove provided at a location where the bearing and the rotor face each other axially, and a radial dynamic pressure groove provided at a location where the bearing and the rotor face each other radially (eighth configuration).

[0063] In addition, the blower device according to one aspect of the present disclosure includes a motor having any one of the first to eighth configurations and a moving blade rotatable about the central axis together with the rotor of the motor (ninth configuration).

Industrial Applicability

[0064] The present disclosure can be used, for example, in blower devices for various applications.

Explanation of Signs

[0065] 1 Rotor 2 Stator 3 Stationary part 10 Rotor hub 10A Shaft part 10B Disk part 10C, 10D Wall parts 11 Retaining part 12 Magnet 21 Stator core 22 Coil part 31 Base part 32 Bearing 33 Cap 34 Annular member 34A, 34B Annular parts 34C Connecting part 41 Radial dynamic pressure groove 42, 43 Thrust dynamic pressure grooves 100 Blower device 101 Motor 102 Impeller 102A Moving blade 310 Second groove 310A, 310B Inclined parts 310C Axial direction part 311 Stator holder 311A Cylindrical part 311B Bearing housing part 311B Axial direction housing part 320 First groove 320A, 320B Inclined parts 320C Axial direction part 341 Cut CA Central Axis H Through-Hole SP Gap W Wall

Claims

1. A rotor rotatable about a central axis extending in the axial direction, a bearing that rotatably supports the rotor inward in the radial direction, a bearing housing portion that houses the bearing inward in the radial direction, an annular member disposed over at least a part of the entire circumferential direction, comprising: the bearing has a first groove that is recessed inward in the radial direction on the outer peripheral side surface and is disposed over at least a part of the entire circumferential direction, the bearing housing portion has a second groove that is recessed outward in the radial direction on the inner peripheral side surface and is disposed over at least a part of the entire circumferential direction, a part of the annular member is housed in the first groove, another part of the annular member is housed in the second groove, a motor.

2. The motor according to claim 1, wherein at least a part of the first groove and at least a part of the second groove overlap in the axial direction.

3. The motor according to claim 1, wherein the annular member has a break in a part of the entire circumferential direction.

4. The motor according to claim 1, wherein in at least one of the first groove and the second groove, the radial depth of the second groove decreases as it goes in one axial direction, and the radial depth of the first groove decreases as it goes in the other axial direction.

5. The motor according to claim 1, wherein the cross-section when cut along a cutting plane including the central axis of the annular member is circular.

6. The motor according to claim 1, wherein the cross-section when cut along a cutting plane including the central axis of the annular member is rectangular.

7. The bearing housing portion has a first wall portion disposed in the circumferential direction opposite to the bearing in the radial direction at one axial end, The motor according to claim 1, wherein the rotor has a second wall portion disposed in the circumferential direction in a radial gap between the bearing and the first wall portion.

8. The motor according to claim 1, comprising at least one of a thrust dynamic pressure groove provided at a location where the bearing and the rotor face each other in the axial direction and a radial dynamic pressure groove provided at a location where the bearing and the rotor face each other in the radial direction.

9. A motor according to any one of claims 1 to 8, and a blower comprising a rotor of the motor and a moving blade rotatable about the central axis together with the rotor.

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