Motor, motor device, and method for manufacturing motor device

Abstract

This motor (12) comprises: a housing (20) that holds ball bearings (22); a shaft (24) that is rotatably supported by the ball bearings and that has a fixing part (24A) on one side end thereof in the axial direction which a rotating member (14) is fixed to via press fitting; a case (26) that has a shaft receiving part (48) which faces the other side end of the shaft (24) in the axial direction with a gap (50) therebetween, and a cover part (44) which is formed on the periphery of the shaft receiving part and which is flexible; and interposed parts (30) that are interposed between the housing and the cover part.

Description

Motor, motor device, and method for manufacturing the motor device CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is based on and claims the benefit of priority from Japanese Patent Application No. 2023-122054, filed on July 26, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to a motor, a motor device, and a method for manufacturing a motor device.

[0003] Japanese Patent No. 2520887 discloses an electric device comprising: a cylindrical housing with a bottom; a stator provided within the housing; a rotor arranged within the housing so as to be concentric with the stator; a rotating shaft to which the rotor is attached, one end of which faces the bottom surface of the housing and the other end of which is located outside the housing; a bearing that rotatably supports the rotating shaft on the housing; a flexible section formed on the bottom surface of the housing so as to be displaceable in the axial direction of the rotating shaft; a gap section formed between the flexible section and one end of the rotating shaft, and having a minimum clearance set therein that is necessary to prevent interference between the flexible section and one end of the rotating shaft when the rotating shaft rotates; and a driven member that is press-fitted into the other end of the rotating shaft from the other end toward the one end.

[0004] As a result of detailed investigation by the inventors, it was found that in a configuration such as the above-mentioned electric device, in which the flexible portion bends when the driven member is pressed in and the rotating shaft is supported by the stopper via the flexible portion, there is a problem that the flexible portion may break as it bends, and foreign matter or water may enter the inside of the housing through the broken part.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a motor, a motor device, and a method for manufacturing a motor device that can suppress damage to the shaft receiving portion when a rotating member is pressed into the shaft.

[0006] A first aspect of the present disclosure is a motor comprising: a housing that holds a ball bearing; a shaft that is rotatably supported by the ball bearing and has a fixing portion at one axial end to which a rotating member is fixed by press-fitting; a shaft receiving portion that faces the other axial end of the shaft with a gap; a case that has a flexible cover portion formed around the shaft receiving portion; and an interposition portion that is interposed between the housing and the cover portion.

[0007] A second aspect of the present disclosure is a motor device including the motor according to the first aspect and the rotating member.

[0008] A third aspect of the present disclosure is a method for manufacturing a motor device according to the second aspect, which includes, in a press-fitting process for fixing the rotating member to one axial end of the shaft by press-fitting, transmitting the load generated when the rotating member is pressed into the cover portion via the ball bearing, the housing, and the intervening portion, thereby deflecting the cover portion and bringing the other axial end of the shaft into contact with a jig via the shaft receiving portion, and completing the press-fitting of the rotating member in a state where the other axial end of the shaft is in contact with the jig via the shaft receiving portion.

[0009] According to the present disclosure, a motor, a motor device, and a method for manufacturing a motor device are provided that can suppress damage to a shaft receiving portion when a rotating member is press-fitted onto a shaft.

[0010] FIG. 1 is a longitudinal sectional view schematically showing a motor device according to the present embodiment; FIG. 2 is a view illustrating a first step of a press-fitting process according to the present embodiment; FIG. 3 is a view illustrating a second step of a press-fitting process according to the present embodiment; FIG. 4 is a view illustrating a third step of a press-fitting process according to the present embodiment; FIG. 5 is a graph showing the relationship between the displacement amount of a sealing material and a load according to the present embodiment; FIG. 6 is a longitudinal sectional view showing a case according to a first modified example; FIG. 7 is a graph showing the relationship between the displacement amount of a sealing material and a load according to the first modified example; FIG. 8 is a longitudinal sectional view showing a case according to a second modified example; FIG. 9 is a graph showing the relationship between the displacement amount of a sealing material and a load according to the second modified example; FIG. 10 is a longitudinal sectional view showing a motor device according to a third modified example; FIG. 11 is a graph showing the relationship between the displacement amount of a sealing material and a load according to the third modified example; FIG. 12 is a longitudinal sectional view showing a motor device according to a fourth modified example; FIG. 13 is a longitudinal sectional view showing a motor device according to a fifth modified example; FIG. 14 is a longitudinal sectional view showing a motor device according to a sixth modified example; FIG. 15 is a longitudinal sectional view showing a motor device according to a seventh modified example.

[0011] Hereinafter, one embodiment of the present disclosure will be described.

[0012] FIG. 1 is a vertical cross-sectional view schematically illustrating a motor device 10 according to this embodiment. The motor device 10 includes a motor 12 and a fan 14. The fan 14 is an example of a "rotating member" in this disclosure. The motor 12 is, for example, an outer rotor brushless motor. The motor 12 includes a stator 16, a rotor 18, a housing 20, ball bearings 22, a shaft 24, a case 26, a substrate 28, and a sealing material 30.

[0013] The arrow A side indicates one axial side of the motor 12, and the arrow B side indicates the other axial side of the motor 12. Note that, hereinafter, one axial side of each part will be referred to as "side A," and the other axial side of each part will be referred to as "side B."

[0014] The stator 16 is formed in an annular shape and includes a stator core 32 and a winding (not shown). The winding is wound around the stator core 32.

[0015] The rotor 18 has a rotor housing 34 and a rotor magnet 36. The rotor housing 34 is formed in a cylindrical shape with a top. The rotor magnet 36 is fixed to the inner circumferential surface of the rotor housing 34. The stator 16 is disposed inside the rotor housing 34. The rotor magnet 36 is disposed radially outward of the stator 16 and faces the stator 16.

[0016] The housing 20 has a base portion 38 and a center piece 40. The base portion 38 is formed in a plate shape and is disposed with its thickness oriented in the axial direction of the motor 12. The center piece 40 is disposed on side A of the base portion 38 material. The center piece 40 is formed in a cylindrical shape and is disposed coaxially with the central axis of the motor 12. The base portion 38 and the center piece 40 may be formed integrally or separately. The center piece 40 is press-fitted into the inside of the stator core 32, thereby supporting the stator 16 by the center piece 40.

[0017] The ball bearing 22 is housed inside the center piece 40. The ball bearing 22 is arranged at the end of the center piece 40 on side A. The ball bearing 22 has an outer ring 22A, a plurality of balls 22B, and an inner ring 22C. The outer ring 22A is press-fitted into the inside of the center piece 40, thereby holding the ball bearing 22 in place in the center piece 40. The inner ring 22C is rotatably supported by the outer ring 22A via the plurality of balls 22B.

[0018] The shaft 24 is rod-shaped and made of iron. The shaft 24 extends along the axial direction of the motor 12 and is disposed on the central axis of the motor 12. The shaft 24 is press-fitted into the inner ring 22C, and is thereby rotatably supported by the ball bearing 22. A rotor housing 34 is fixed to the shaft 24 so as to rotate integrally therewith. The end of the shaft 24 on side A is formed as a fixing portion 24A for fixing the fan 14. The fixing portion 24A protrudes from the rotor housing 34 in the direction of arrow A.

[0019] The fan 14 has a through-hole 14A that penetrates in the axial direction of the fan 14. The through-hole 14A penetrates along the central axis of the fan 14. The fixing portion 24A is press-fitted into the through-hole 14A, thereby fixing the fan 14 to the fixing portion 24A. In other words, the fan 14 is fixed to the fixing portion 24A by press-fitting from side A.

[0020] The case 26 is disposed on the B side of the base portion 38. The case 26 has a bulging portion 42 and a cover portion 44. The bulging portion 42 is provided on the central axis of the motor 12. The bulging portion 42 is formed by a portion of the case 26 bulging outward toward the A side. A recess 46 that opens toward the B side is formed inside the bulging portion 42.

[0021] The top of the bulge 42 is formed as a shaft receiving portion 48 that receives the shaft 24 when the fan 14 is press-fitted onto the shaft 24. The shaft receiving portion 48 is flat and extends in a direction perpendicular to the central axis of the motor 12. The shaft receiving portion 48 is circular when viewed in the axial direction of the motor 12. The shaft receiving portion 48 faces the end of the shaft 24 on side B, with a gap 50 between them. The dimension of the gap 50 (i.e., the width along the axial direction of the motor 12) is set to the minimum value that ensures clearance between the shaft 24 and the shaft receiving portion 48 even when the shaft 24 is displaced to side B due to deformation of the ball bearing 22 caused by the weight of the fan 14 (i.e., displacement of the inner ring 22C to side B relative to the outer ring 22A).

[0022] The cover portion 44 is formed around the shaft receiving portion 48. Specifically, the portion of the case 26 other than the bulge portion 42 constitutes the cover portion 44. The cover portion 44 is formed in a plate shape and is disposed with its thickness oriented in the axial direction of the motor 12. The cover portion 44 is disposed on side B of the base portion 38, facing the base portion 38. A space 52 for accommodating the circuit board 28, which will be described later, is formed between the base portion 38 and the cover portion 44.

[0023] The entire case 26, including the cover portion 44, is formed from resin, which provides flexibility to the cover portion 44. That is, as will be described later, the cover portion 44 is configured to bend toward side B when a load is applied to side B by the sealing material 30 when the fan 14 is press-fitted.

[0024] The substrate 28 is formed in a plate shape and is disposed with its thickness oriented in the axial direction of the motor 12. Electronic components for supplying current to the windings are mounted on the substrate 28. Through holes 28A, 38A that penetrate the substrate 28 and the base portion 38 described above in the axial direction of the motor 12 are formed, respectively, and the B-side portion of the shaft 24 is inserted into each of the through holes 28A, 38A.

[0025] The sealant 30 extends from the cover portion 44 toward the base portion 38 and is interposed between the housing 20 (specifically, the cover portion 44) and the base portion 38. The end portion on side B of the sealant 30 is fixed to the cover portion 44, and the end portion on side A of the sealant 30 abuts against the base portion 38. The sealant 30 is an example of an "intervening portion" in the present disclosure. The sealant 30 is formed in an annular shape along the outer periphery of the case 26 (specifically, the base portion 38) and surrounds the periphery of the substrate 28. The sealant 30 seals between the housing 20 and the cover portion 44, enclosing the space 52.

[0026] The sealant 30 is elastic. The sealant 30 may be made of rubber or elastomer. The sealant 30 has a cross-sectional shape that tapers toward side A. As described below, when a load is applied from the housing 20 when the fan 14 is press-fitted, the sealant 30 has a rigidity sufficient to cause the cover portion 44 to bend toward side B while elastically deforming in the compression direction. The sealant 30 has a rigidity lower than that of the cover portion 44 in order to absorb the load applied to the ball bearing 22 when the fan 14 is press-fitted. In other words, when comparing the amount of displacement of the sealant 30 in the compression direction and the amount of displacement of the cover portion 44 in the bending direction (both of which are displacements in the axial direction of the motor 12) at a position where a load is input from the housing 20 through the sealant 30 to the cover portion 44, the amount of displacement of the sealant 30 in the compression direction is smaller than the amount of displacement of the cover portion 44 in the bending direction.

[0027] Next, a method of manufacturing the motor device 10 according to this embodiment will be described with reference to Figures 2 to 5. Note that the stator 16, rotor 18, and substrate 28 are not shown in Figures 2 to 5.

[0028] The manufacturing method for motor device 10 according to this embodiment is a method for manufacturing motor device 10 by fixing fan 14 to shaft 24 by press-fitting, and includes a press-fitting step for press-fitting fan 14. In the press-fitting step, side A is set to be the upper side in the vertical direction. In the press-fitting step, jig 54 is inserted into recess 46 from side B, and the tip of jig 54 is placed in a state where it abuts against shaft receiving portion 48 from side B. Below, the press-fitting step will be described in detail, divided into a first step ST1, a second step ST2, and a third step ST3.

[0029] FIG. 2 illustrates the first step ST1. In this step, the fan 14 is set on the fixed portion 24A to an initial state. In this step ST1, the weight of the fan 14 causes the seal material 30 to generate a load F1 as a reaction force, and the load F1 is applied to the outer ring 22A of the ball bearing 22. In this step ST1, the displacement of the seal material 30 is L1 due to the weight of the fan 14, and a gap 50 with a dimension ΔL is maintained between the shaft 24 and the shaft receiving portion 48. Note that the displacement L1 includes the compressive deformation of the seal material 30.

[0030] 3 is a diagram illustrating the second step ST2. The second step ST2 is a step from the initial state to a state in which the shaft 24 abuts against the jig 54 via the shaft receiving portion 48. That is, in the second step ST2, the load generated when the fan 14 is press-fitted is transmitted to the cover portion 44 via the ball bearing 22, the housing 20, and the sealant 30, thereby deflecting the cover portion 44 toward side B and causing the shaft 24 to abut against the jig 54 via the shaft receiving portion 48.

[0031] In the second step ST2, a press-fit load is applied to the fan 14, causing the sealant 30 to generate a load F2 as a reaction force, and the load F2 is applied to the outer ring 22A of the ball bearing 22. In addition, in the second step ST2, the displacement amount of the sealant 30 is a displacement amount L2 caused by the cover portion 44 bending until the shaft 24 hits the jig 54 via the shaft receiving portion 48. Note that the displacement amount L2 includes the amount of compressive deformation of the sealant 30.

[0032] 4 is a diagram illustrating the third step ST3. The third step ST3 is a step from when the shaft 24 is abutted against the jig 54 via the shaft receiving portion 48 to when the press-fitting of the fan 14 is completed. That is, in the third step ST3, the shaft 24 is abutted against the jig 54 via the shaft receiving portion 48, restraining the position of the shaft 24, and then the fixing portion 24A of the shaft 24 is press-fitted into the through-hole 14A of the fan 14 to a predetermined position.

[0033] In the third step ST3, a press-fit load is applied to the fan 14 with the shaft 24 abutting against the jig 54 via the shaft receiving portion 48. As a result, the shaft receiving portion 48 generates a load Fc as a reaction force and deforms in the compressive direction. The amount of deformation of the shaft receiving portion 48 in this case is a deformation amount Lc. As the shaft receiving portion 48 deforms, the sealant 30 generates a load F3 as a reaction force, and the load F3 is applied to the outer ring 22A of the ball bearing 22. In the third step ST3, the amount of displacement of the sealant 30 is a deformation amount L3 that includes the amount of displacement associated with the deflection of the cover portion 44 and the deformation amount Lc of the shaft receiving portion 48. Note that the deformation amount L3 includes the compressive deformation of the sealant 30.

[0034] 5 is a graph showing the relationship between the displacement of the sealing material 30 and the load according to this embodiment. As described above, in the first step ST1, a load F1 is applied to the outer ring 22A of the ball bearing 22 corresponding to the displacement L1 of the sealing material 30. In the second step ST2, a load F2 is applied to the outer ring 22A of the ball bearing 22 corresponding to the displacement L2 of the sealing material 30. In the third step ST3, a load F3 is applied to the outer ring 22A of the ball bearing 22 corresponding to the deformation L3 of the sealing material 30. The difference between the displacement L2 and the displacement L1 is approximately equal to the dimension ΔL between the shaft 24 and the shaft receiving portion 48. Furthermore, the difference between the deformation L3 and the displacement L2 is approximately equal to the displacement Lc, which is the compressive deformation of the shaft receiving portion 48. The press-fit load applied to the fan 14 is maximized at the deformation L3.

[0035] Here, the ball bearing 22 has an allowable load set in the thrust direction, and if the load applied to the ball bearing 22 exceeds the allowable load when the press-fit load applied to the fan 14 reaches its maximum, there is a risk that the ball bearing 22 will be damaged.

[0036] However, in the manufacturing method of motor device 10 according to this embodiment, even if shaft receiving portion 48 is deformed in the compressive direction from second step ST2 to third step ST3, sealing material 30 elastically deforms in the compressive direction, thereby reducing the load applied to ball bearing 22. In other words, the load gradient from second step ST2 to third step ST3 is gentler than the load gradient from first step ST1 to second step ST2. This prevents the load applied to ball bearing 22 from exceeding the allowable load.

[0037] In this embodiment, the rigidity of the sealing material 30 is set so that the load F3 corresponding to the deformation amount L3 is below the allowable load. However, since the sealing material 30 includes dimensional errors, it is sufficient that the displacement amount corresponding to the load F3 falls within an acceptable range with the deformation amount L3 as the center value. Note that, from the second step ST2 to the third step ST3, when the shaft receiving portion 48 is deformed in the compression direction, the cover portion 44 also bends toward side B, thereby reducing the load applied to the ball bearing 22.

[0038] Next, the effects of this embodiment will be described.

[0039] As described above in detail, in this embodiment, the case 26 has the shaft receiving portion 48 that faces the end of the shaft 24 on side B with a gap 50 therebetween, and the flexible cover portion 44 that is formed around the shaft receiving portion 48. The sealant 30 is interposed between the housing 20 and the cover portion 44. During the press-fitting process of the fan 14, the load applied when the fan 14 is pressed into the case is transmitted to the cover portion 44 via the ball bearing 22, the housing 20, and the sealant 30, thereby bending the cover portion 44 and causing the shaft 24 to abut against the jig 54 via the shaft receiving portion 48. Therefore, for example, the amount of deformation of the shaft receiving portion 48 during press-fitting of the fan 14 can be reduced compared to when the shaft receiving portion 48 is bent by the gap 50 between the shaft 24 and the shaft receiving portion 48. This reduces damage to the shaft receiving portion 48 during press-fitting of the fan 14.

[0040] The case 26 also has a shaft receiving portion 48. It is also possible to provide a through hole instead of the shaft receiving portion 48, insert the shaft 24 into the through hole, and directly receive the shaft 24 in the jig 54. However, in this case, a member to block the through hole is required, which increases costs. Furthermore, there is a risk of foreign matter or water entering through the through hole. In this regard, since the case 26 has the shaft receiving portion 48 in this embodiment, the increase in the number of parts can be suppressed compared to when a through hole is provided, thereby reducing costs. Furthermore, since the case 26 does not have a through hole, it is also possible to prevent foreign matter or water from entering through the through hole.

[0041] Furthermore, the shaft receiving portion 48 is formed on the case 26. Therefore, compared to when the shaft receiving portion 48 is separate from the case 26, the number of parts can be reduced, leading to cost reductions.

[0042] Furthermore, the sealing material 30 has elasticity. Therefore, even if the shaft receiving portion 48 is deformed in the compression direction during the press-fitting process, the elastic deformation of the sealing material 30 can reduce the load applied to the ball bearing 22. This prevents the load applied to the ball bearing 22 from exceeding the allowable load of the ball bearing 22, thereby preventing damage to the ball bearing 22.

[0043] Furthermore, the seal material 30 is used to reduce the load applied to the ball bearing 22. Therefore, compared to when a member for reducing the load is used in addition to the seal material 30, the number of parts can be reduced, leading to cost reduction.

[0044] Furthermore, the sealing material 30 has a cross-sectional shape that tapers toward the housing 20. Therefore, by adjusting the cross-sectional shape of the sealing material 30 (particularly the cross-sectional shape of the tapered tip portion), it is possible to adjust the manner in which the sealing material 30 elastically deforms, and thus to adjust the amount of reduction in the load applied to the ball bearing 22.

[0045] Furthermore, the sealing material 30 is formed in a ring shape along the outer periphery of the case 26. Therefore, the load applied to the ball bearing 22 when the fan 14 is press-fitted can be reduced while ensuring the airtightness of the space 52 for accommodating the substrate 28.

[0046] In addition, the cover portion 44 is flexible. Therefore, when the shaft receiving portion 48 is deformed in the compression direction during the press-fitting process, the cover portion 44 also undergoes elastic deformation, thereby reducing the load applied to the ball bearing 22.

[0047] Next, a modification of this embodiment will be described.

[0048] 6 is a vertical cross-sectional view showing a case 26 according to a first modified example. In the first modified example, the shaft receiving portion 48 is formed of a metal plate.

[0049] 7 is a graph showing the relationship between the displacement amount of the sealing material 30 and the load according to the first modification. In the first modification, the shaft receiving portion 48 is formed of a metal plate, which reduces the amount of compressive deformation of the shaft receiving portion 48 from the second step ST2 to the third step ST3. This reduces the increase in the load applied to the ball bearing 22 from the second step ST2 to the third step ST3, making it possible to keep the load constant.

[0050] 8 is a vertical cross-sectional view showing a case 26 according to a second modified example. In the second modified example, the shaft receiving portion 48 is thinner than the cover portion 44. That is, the thickness t1 of the shaft receiving portion 48 is thinner than the thickness t2 of the cover portion 44.

[0051] 9 is a graph showing the relationship between the displacement amount and the load of the sealing material 30 according to the second modification. In the second modification, the shaft receiving portion 48 is thinner than the cover portion 44, which reduces the amount of compressive deformation of the shaft receiving portion 48 from the second step ST2 to the third step ST3. This reduces the increase in the load applied to the ball bearing 22 from the second step ST2 to the third step ST3.

[0052] 10 is a longitudinal cross-sectional view showing a motor device 10 according to a third modified example. In the third modified example, the cover portion 44 is formed continuously with the shaft receiving portion 48 and has a cross-sectional shape that is curved convexly toward the housing 20.

[0053] 11 is a graph showing the relationship between the displacement and load of the sealing material 30 according to the third modification. In the third modification, the cover portion 44 has a cross-sectional shape that is convexly curved toward the housing 20, making it more likely to bend toward side B than if the cover portion 44 were formed in a flat plate shape. As a result, even if the shaft receiving portion 48 is deformed in the compressive direction from the first step ST1 to the third step ST3, the cover portion 44 bends, thereby suppressing an increase in the load applied to the ball bearing 22.

[0054] 12 is a longitudinal cross-sectional view showing a motor device 10 according to a fourth modified example. In the fourth modified example, the seal material 30 is formed to have a constant cross section (i.e., a constant thickness) along the axial direction of the shaft 24.

[0055] 13 is a longitudinal cross-sectional view showing a motor device 10 according to a fifth modified example. In the fifth modified example, the seal material 30 has a constricted cross-sectional shape when viewed in a direction perpendicular to the axial direction of the shaft 24 (i.e., in the radial direction of the motor device 10).

[0056] 14 is a vertical cross-sectional view showing a motor device 10 according to a sixth modified example. In the sixth modified example, the sealing material 30 has a cross-sectional shape that tapers toward the side opposite the housing 20 (i.e., toward the case 26).

[0057] FIG. 15 is a longitudinal cross-sectional view showing a motor device 10 according to a seventh modified example. In the seventh modified example, the cover portion 44 of the case 26 has a first extension portion 56 extending toward the base portion 38 and a second extension portion 58 extending from the tip of the first extension portion 56 radially outward from the motor device 10. The sealant 30 is provided on the second extension portion 58 and is formed with a constant cross section (i.e., a constant thickness) along the axial direction of the shaft 24. The sealant 30 has a recess 60 that opens toward the shaft 24, and the radially outer end of the base portion 38 is fitted into the recess 60. The portion of the sealant 30 interposed between the housing 20 and the cover portion 44 is an example of an "intervening portion" in this disclosure.

[0058] Furthermore, in the above embodiment, the elastic seal material 30 is provided between the housing 20 and the cover portion 44, but a non-elastic seal material 30 may be provided. Furthermore, instead of the seal material 30, a side wall portion extending from the cover portion 44 toward the housing 20 may be provided. The side wall portion is an example of an "intervening portion" in the present disclosure.

[0059] In addition, in the above embodiment, an annular seal 30 is provided between the housing 20 and the cover portion 44, but multiple seals 30 may be provided lined up along the outer periphery of the case 26.

[0060] In the above embodiment, the seal material 30 is set to have a lower rigidity than the cover portion 44 , but it may be set to have a higher rigidity than the cover portion 44 .

[0061] Furthermore, in the above embodiment, the motor device 10 includes the fan 14, but it may also include a rotating member other than the fan 14. Furthermore, the rotating member may be, for example, a driven member such as a gear.

[0062] Furthermore, the above-described multiple modifications may be implemented in combination as appropriate.

[0063] The above describes one embodiment of the present disclosure, but the present disclosure is not limited to the above, and it goes without saying that various modifications can be made to the present disclosure without departing from the spirit of the present disclosure.

[0064] The present disclosure discloses the following supplementary notes. (Supplementary Note 1) A motor (12) comprising: a housing (20) that holds ball bearings (22); a shaft (24) rotatably supported by the ball bearings and having a fixing portion (24A) at one axial end to which a rotating member (14) is fixed by press-fitting; a case (26) having a shaft receiving portion (48) facing the other axial end of the shaft with a gap (50) therebetween and a flexible cover portion (44) formed around the shaft receiving portion; and an intervening portion (30) intervening between the housing and the cover portion. (Supplementary Note 2) The motor according to Supplementary Note 1, wherein the intervening portion has elasticity. (Supplementary Note 3) The motor according to Supplementary Note 1 or Supplementary Note 2, wherein the intervening portion is a sealing material (30) that seals between the housing and the cover portion. (Supplementary Note 4) The motor according to Supplementary Note 3, wherein the sealing material has a cross-sectional shape that tapers toward the housing. (Supplementary Note 5) The motor according to Supplementary Note 3 or Supplementary Note 4, wherein the sealing material is formed in an annular shape along the outer periphery of the case. (Supplementary Note 6) The motor according to any one of Supplementary Notes 1 to 5, wherein the shaft receiving portion is made of metal. (Supplementary Note 7) The motor according to any one of Supplementary Notes 1 to 6, wherein the shaft receiving portion is thinner than the cover portion. (Supplementary Note 8) The motor according to any one of Supplementary Notes 1 to 7, wherein the cover portion has a cross-sectional shape that is curved convexly toward the housing side. (Supplementary Note 9) A motor device (10) comprising: the motor according to any one of Supplementary Notes 1 to 8; and the rotating member.(Supplementary Note 10) A method for manufacturing a motor device according to Supplementary Note 9, comprising: in a press-fitting step of fixing the rotating member to one axial end of the shaft by press-fitting, transmitting a load generated when the rotating member is pressed into the cover portion via the ball bearing, the housing, and the intervening portion to deflect the cover portion, thereby causing the other axial end of the shaft to abut against a jig (54) via the shaft receiving portion; and completing the press-fitting of the rotating member in a state in which the other axial end of the shaft abuts against the jig via the shaft receiving portion. (Supplementary Note 11) The intervening portion has elasticity, and the method for manufacturing a motor according to Supplementary Note 10 comprises: elastically deforming the intervening portion in the press-fitting step to reduce the load applied to the ball bearing. (Supplementary Note 12) A method for manufacturing a motor according to Supplementary Note 10 or Supplementary Note 11 comprises: elastically deforming the cover portion in the press-fitting step to reduce the load applied to the ball bearing.

Claims

1. A housing (20) having a cylindrical center piece (40) that holds a ball bearing (22) and a base portion (38) formed around the base end of the center piece; a shaft (24) that is rotatably supported by the ball bearing and has a fixing portion (24A) at one end on the axial side to which the rotating member (14) is fixed by press-fitting; a case (26) provided on the central axis of the motor (12), the case having a bulge (42) formed as a shaft receiving portion (48) whose top faces the other axial end of the shaft with a gap (50) therebetween, and a flexible cover portion (44) formed around the base end of the bulge; an intervening portion (30) interposed between the base portion and the cover portion; A motor (12) comprising:

2. The interposed portion has elasticity. The motor according to claim 1 .

3. The interposed portion is a sealant (30) that seals between the housing and the cover portion. The motor according to claim 1 .

4. The sealing material has a cross-sectional shape that tapers toward the housing. The motor according to claim 3.

5. The sealing material is formed in a ring shape along the outer periphery of the case. The motor according to claim 3.

6. The shaft receiving portion is made of metal. The motor according to claim 1 .

7. The shaft receiving portion is thinner than the cover portion. The motor according to claim 1 .

8. The cover portion has a cross-sectional shape that is curved convexly toward the housing side. The motor according to claim 1 .

9. A motor according to any one of claims 1 to 8; The rotating member; A motor device (10) comprising:

10. A method for manufacturing a motor device according to claim 9, comprising: In a press-fitting step of press-fitting the rotating member onto one axial end of the shaft, a load generated when the rotating member is press-fitted is transmitted to the cover portion via the ball bearing, the housing, and the interposition portion, thereby deflecting the cover portion and bringing the other axial end of the shaft into contact with a jig (54) via the shaft receiving portion, and completing the press-fitting of the rotating member in a state where the other axial end of the shaft is abutted against the jig via the shaft receiving portion. A method for manufacturing a motor device.

11. The interposition portion has elasticity, The press-fitting step includes reducing the load applied to the ball bearing by elastically deforming the interposed portion. The method for manufacturing a motor according to claim 10.

12. The press-fitting step includes reducing the load applied to the ball bearing by elastically deforming the cover portion. The method for manufacturing a motor according to claim 10.