Motor

Abstract

To provide a motor whose performance is stable.SOLUTION: A motor 1 comprises; a revolving shaft 20; a ring 90 fixed to the revolving shaft 20; a housing 10 provided with an inner peripheral part 110i; springs 80; and a bearing 30 provided with an inner ring 31 and an outer ring 32 comprising rolling bodies 33, ends 31T, 32T and the other ends 31D, 32D located on sides of the respective springs 80 in a revolving shaft direction. One end 32T of the outer ring 32 is elastically supported by the inner peripheral part 110i of the housing 10 via one of the springs 80 in the revolving shaft direction to fix one end 31T of the inner ring 31 to the ring 90 in the revolving shaft direction. The other end 31D of the inner ring 31 and the other end 32D of the outer ring 32 are movable together with the revolving shaft 20.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a motor. [Background technology]

[0002] BACKGROUND ART There is known a motor that includes an impeller, a bearing, and a preload spring that applies a preload to the bearing against a thrust force generated by rotation of the impeller (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-7451 Summary of the Invention [Problem to be solved by the invention]

[0004] In a motor such as that described in Patent Document 1, if the preload spring is deformed, the stability of the motor's performance may be impaired.

[0005] Therefore, one of the objects of the present invention is to provide a motor with stable performance. [Means for solving the problem]

[0006] (1): The motor of the present invention comprises a rotating shaft, a ring fixed to the rotating shaft, a housing having an inner periphery, a spring, rolling elements, and a bearing having an inner ring and an outer ring, each having one end on the spring side in the direction of the rotating shaft and the other end opposite the one end, wherein the one end of the outer ring is elastically supported by the spring on the inner periphery of the housing in the direction of the rotating shaft, the one end of the inner ring is fixed to the ring in the direction of the rotating shaft, and the other end of the inner ring and the other end of the outer ring can move together with the rotating shaft.

[0007] (2): In the motor of (1), the inner peripheral portion of the housing may form a space that is open to the other end of the inner ring and the other end of the outer ring in the direction of the rotation axis.

[0008] (3): In the motor of (1) or (2), the bearing may be a first bearing, and the motor may include a second bearing, a stator, and a rotor, the stator and the rotor may be arranged between the first bearing and the second bearing in the direction of the rotation axis, and the part of the rotation axis supported by the second bearing may be biased in the direction of the rotation axis by the spring. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view of a motor according to an embodiment of the present invention, as viewed from one side in the direction of a rotation axis. [Figure 2] 2 is a perspective view of the motor shown in FIG. 1 as viewed from the other side in the direction of the rotation axis. [Figure 3] 2 is a cross-sectional view taken along the rotation axis direction of the motor shown in FIG. 1. [Figure 4] 4 is an enlarged view showing the vicinity of the inner periphery of a first housing which is a part of the housing of the motor shown in FIG. 3. FIG. [Figure 5] 4 is a diagram showing the motor shown in FIG. 3 with the first bearing and other components removed. FIG. [Figure 6] 4 is a diagram showing how the rotating shaft and the like of the motor shown in FIG. 3 are attached. FIG. [Figure 7] 4 is a diagram showing a state in which the mounting of the rotating shaft and the like of the motor shown in FIG. 3 is completed. [Figure 8] 4 is a diagram showing a state in which a first bearing of the motor shown in FIG. 3 is attached. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Below, embodiments of a motor according to the present invention will be illustrated with reference to the accompanying drawings. The embodiments illustrated below are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention can be modified or improved from the following embodiments without departing from the spirit of the present invention. In addition, in the accompanying drawings, the dimensions of each component may be exaggerated or reduced, and hatching may be omitted, in order to facilitate understanding.

[0011] 1 and 2 are perspective views showing a motor according to this embodiment. As shown in FIGS. 1 and 2, the motor 1 according to this embodiment includes a housing 10, a rotating shaft 20, a first bearing 30, and a second bearing 40. The rotating shaft 20 penetrates the center of the housing 10 and has an end 21 and an end 22 opposite the end 21 in the direction of the rotating shaft, which is the longitudinal direction of the rotating shaft 20 (hereinafter referred to as the "rotational axis direction"). Hereinafter, for convenience, the side of the end 22 in the rotational axis direction will be referred to as "one side" or "one side," and the side of the end 21 in the rotational axis direction will be referred to as "the other side" or "the other side." Therefore, FIG. 1 is a perspective view of the motor 1 as seen from one side in the rotational axis direction, and FIG. 2 is a perspective view of the motor 1 as seen from the other side in the rotational axis direction. Hereinafter, the direction passing through the center of the rotating shaft 20 and perpendicular to the rotating shaft 20 will sometimes be referred to as the "radial direction."

[0012] The rotating shaft 20 is attached to the housing 10 via a first bearing 30 and a second bearing 40 so as to be rotatable relative to the housing 10 .

[0013] Fig. 3 is a cross-sectional view taken along the rotational axis of the motor 1. As shown in Fig. 3, the motor 1 further includes a stator 50, a rotor 60, an impeller 70, a spring 80, and a ring 90. For convenience, the impeller 70 is not shown in the figures other than Fig. 3.

[0014] As shown in Figures 1 to 3, the housing 10 of the motor 1 includes a first housing 11 on the other side in the direction of the rotational axis (the side of end 21 of the rotational axis 20), a second housing 12 on one side in the direction of the rotational axis (the side of end 22 of the rotational axis 20), and a plurality of connecting portions 13 connecting the first housing 11 and the second housing 12.

[0015] The outer shape or size of the first housing 11 of the housing 10 is triangular when viewed in the rotational axis direction. The first housing 11 includes a main body 110 and a plurality of protrusions 112. The main body 110 includes a surface 110A on the other side in the rotational axis direction (hereinafter, for convenience, referred to as the "lower surface 110A") and a surface 110B on one side (hereinafter, for convenience, referred to as the "upper surface 110B"). The lower surface 110A and the upper surface 110B each have an outer shape or size that is substantially triangular when viewed in the rotational axis direction and overlap each other. The length (height) of the main body 110 in the rotational axis direction is shorter than the lengths of the sides of the lower surface 110A and the upper surface 110B. Therefore, the main body 110 has a flat triangular prism shape in the rotational axis direction. A cylindrical through-hole 111 is formed in the center of the main body 110, penetrating the main body 110 in the rotational axis direction. The through hole 111 is defined by an inner periphery 110i of the first housing 11, which is a part of the housing 10. That is, the housing 10 has the inner periphery 110i.

[0016] FIG. 4 is an enlarged view of the vicinity of the inner circumferential portion 110i of the first housing 11. As shown in FIG. 4, the inner circumferential portion 110i defining the through hole 111 includes a cylindrical first inner circumferential surface 110ia, a cylindrical second inner circumferential surface 110ib, a connecting surface 110ic that connects to the spring 80, and a third inner circumferential surface 110id that is an inner surface having an inclined annular surface. In this embodiment, the first inner circumferential surface 110ia, the second inner circumferential surface 110ib, and the third inner circumferential surface 110id are cylindrical surfaces that are formed concentrically with respect to the center of the rotation shaft 20. In the rotation shaft direction, the third inner circumferential surface 110id is on the other side, the second inner circumferential surface 110ib is on one side, and the first inner circumferential surface 110ia is between the third inner circumferential surface 110id and the second inner circumferential surface 110ib. The first inner circumferential surface 110ia has a larger outer shape or size (e.g., diameter) than the second inner circumferential surface 110ib. The connecting surface 110ic extends radially and connects the first inner circumferential surface 110ia and the second inner circumferential surface 110ib. The third inner circumferential surface 110id extends in the rotational axis direction from the other end of the first inner circumferential surface 110ia toward the other end 21 of the rotational shaft 20 (see FIG. 3), while increasing the size of the inner circumferential portion 110i.

[0017] As shown in FIGS. 1 to 3, a protrusion 112 is formed at each of three corners 110C of the main body 110. In the rotation axis direction, the protrusion 112 protrudes from the upper surface 110B of the main body 110 toward one side. In the rotation axis direction, a columnar connecting portion 13 extends toward one side from one surface of the protrusion 112. That is, in this embodiment, three connecting portions 13 extend toward one side.

[0018] 1 to 3, the second housing 12 of the housing 10 has an overall tubular shape (cylindrical in this embodiment). The second housing 12 includes a plurality of stator vanes 120, a first cylindrical portion 121, a second cylindrical portion 122, a third cylindrical portion 123, and a connecting portion 124. In this embodiment, the first cylindrical portion 121, the second cylindrical portion 122, and the third cylindrical portion 123 each have a cylindrical shape and are formed concentrically with respect to the center of the rotation shaft 20.

[0019] The first cylindrical portion 121 is located on the innermost side (closer to the rotation shaft 20 in the radial direction) of the first cylindrical portion 121, the second cylindrical portion 122, and the third cylindrical portion 123. The second cylindrical portion 122 is located on the outer side (farther from the rotation shaft 20 in the radial direction) of the first cylindrical portion 121. The connecting portion 124 is an annular plate-shaped portion extending in the radial direction and connects the first cylindrical portion 121 and the second cylindrical portion 122. The first cylindrical portion 121 extends from the connecting portion 124 to one side in the rotation shaft direction. The second cylindrical portion 122 includes a first portion 122A located on the other side in the rotation shaft direction of the connecting portion 124, and a second portion 122B located on one side in the rotation shaft direction. A side surface 122Bs of the second portion 122B is curved so as to approach the rotation shaft 20 as it approaches one side in the rotation shaft direction. In the rotational axis direction, one end of the second portion 122B (i.e., one end 122T of the second cylindrical portion 122) is located closer to the connecting portion 124 (i.e., lower) than one end 121T of the first cylindrical portion 121. A plurality of ribs 125 are formed on the connecting portion 124 along the circumferential direction of the second housing 12, at equal intervals in this embodiment. Each of the plurality of ribs 125 includes a first portion 125A shaped like a quarter circle and occupying the majority of the circumferential direction, and a second portion 125B shaped like a rectangle other than the first portion 125A. The first portion 125A is connected to the outer circumferential surface of the first cylindrical portion 121, and the second portion 125B is connected to the inner circumferential surface of the second portion 122B of the second cylindrical portion 122.

[0020] The third cylindrical portion 123 is located on the outer circumferential side relative to the second cylindrical portion 122 in the radial direction. In the rotational axis direction, one end 123T of the third cylindrical portion 123 is located at approximately the same position as the connecting portion 124, and the other end 123D of the third cylindrical portion 123 is located on the other side relative to the other end 122D of the second cylindrical portion 122 (i.e., the other end of the first portion 122A). In the radial direction, the plurality of stator vanes 120 are located between the third cylindrical portion 123 and the first portion 122A of the second cylindrical portion 122, and are formed at equal intervals along the circumferential direction of the second housing 12 in this embodiment. The plurality of stator vanes 120 are connected to the inner circumferential surface of the third cylindrical portion 123 and the outer circumferential surface of the first portion 122A of the second cylindrical portion 122. The plurality of stator vanes 120 have a shape that rectifies the airflow AF, which will be described later, so that the airflow AF flows from one side to the other side in the rotational axis direction.

[0021] For example, the second housing 12 may be formed by integrally molding the plurality of stator vanes 120, the first cylindrical portion 121, the second cylindrical portion 122, the third cylindrical portion 123, the connecting portion 124, and the plurality of ribs 125.

[0022] 2 and 3, the multiple (three in this embodiment) connecting portions 13 of the housing 10 extend from the three protruding portions 112 of the main body portion 110 of the first housing 11 toward one side in the rotation axis direction, as described above. Each of these connecting portions 13 is connected to the second tubular portion 122 of the second housing 12. Therefore, in this embodiment, the first housing 11 and the second housing 12 are connected by the multiple columnar connecting portions 13.

[0023] For example, the first housing 11, the second housing 12, and the connecting portion 13 may be integrally molded to form the housing 10. The above-described configuration of the housing 10 is an example, and the configuration of the housing 10 is not limited to the above.

[0024] As shown in FIGS. 3 and 4 , the ring 90 of the motor 1 is fixed to the rotating shaft 20 by, for example, adhesive bonding, and substantially the entire ring 90, except for one end of the ring 90 and a portion adjacent thereto, is housed in the through-hole 111 of the first housing 11. The ring 90 is a tubular (cylindrical in this embodiment) member, and is an integrally formed member including a first portion 91 having a small outer shape or size (e.g., outer diameter) and a second portion 92 having a larger outer shape or size (e.g., outer diameter) than the first portion 91. The second portion 92 is connected to one end of the first portion 91, and the outer shape or size (e.g., outer diameter) of the second portion 92 is smaller than the size (diameter) of a second inner circumferential surface 110ib of the inner circumferential portion 110i of the first housing 11. In this embodiment, the first portion 91 and the second portion 92 are formed concentrically with respect to the center of the rotating shaft 20.

[0025] 3 and 4, the spring 80 of the motor 1 is, for example, a spirally wound coil spring, and is attached to the inner circumferential portion 110i of the housing 10. Specifically, the spring 80 is housed in the through-hole 111 of the first housing 11, and one end 80T of the spring 80 is fixedly connected to the connecting surface 110ic of the inner circumferential portion 110i of the first housing 11 by, for example, adhesive, thereby being attached to the connecting surface 110ic. In this way, the spring 80 is housed in the space inside the through-hole 111, inside the first inner circumferential surface 110ia (the space defined by the first inner circumferential surface 110ia). The size (outer diameter) of the spring 80 is approximately equal to the size (diameter) of the first inner circumferential surface 110ia. When the first bearing 30 is mounted in the through-hole 111 of the first housing 11 as described below, the other end 80D of the spring 80 and the other end 90D of the ring 90 (i.e., the other end of the first portion 91 of the ring 90) are located at approximately the same position in the rotational axis direction. Furthermore, the diameter of the inner circumferential portion 80A of the spring 80 (i.e., the inner diameter of the spring 80) is approximately the same as the size (diameter) of the second inner circumferential surface 110ib of the inner circumferential portion 110i of the first housing 11. Therefore, the inner circumferential portion 80A of the spring 80 and the second inner circumferential surface 110ib overlap in the rotational axis direction and are substantially flush with each other. The spring is not limited to a helical coil spring, and a conical spring (disc spring) made of an elastic metal such as phosphor bronze, an annular ring (O-ring) made of an elastic resin (e.g., rubber), or the like may also be used.

[0026] As shown in FIGS. 2 to 4 , the first bearing 30 is a so-called ball bearing, and includes an inner ring 31 on the inner circumferential side, an outer ring 32 on the outer circumferential side, and a plurality of rolling elements 33 located radially between the inner ring 31 and the outer ring 32. The inner ring 31 and the outer ring 32 each have one end and the other end opposite the one end in the rotational axis direction. Specifically, the inner ring 31 includes one end 31T located on the spring 80 side in the rotational axis direction and the other end 31D located on the other end 21 side of the rotating shaft 20. The inner ring 31 is attached to the rotating shaft 20 by being fitted onto the rotating shaft 20, for example, by clearance fit. As a result, the first bearing 30 is disposed in a space within the through-hole 111 of the first housing 11 that is on the inner circumferential side of the first inner circumferential surface 110ia. The outer ring 32 includes one end 32T located on the spring 80 side and the other end 32D located on the other end 21 side of the rotary shaft 20 in the rotational axis direction. The diameter (outer diameter) of the outer ring 32 is approximately equal to the diameter of the first inner circumferential surface 110ia. A space inside the through hole 111, located on the opposite side of the first bearing 30 from the spring 80 side in the axial direction, is located inside the third inner circumferential surface 110id (a space defined by the third inner circumferential surface 110id). Therefore, in the rotational axis direction, the inner circumferential portion 110i of the housing 10 (first housing 11) forms a space (a space inside the third inner circumferential surface 110id) that is open to the other end 31D of the inner ring 31 and the other end 32D of the outer ring 32.

[0027] One end 31T of the inner ring 31 is fixed to the other end 90D of the ring 90, for example, by adhesive. As described above, when the first bearing 30 is installed in the through hole 111, the other end 90D of the ring 90 is located at approximately the same position as the other end 80D of the spring 80 in the rotational axis direction. Therefore, in the rotational axis direction, the one end 31T of the inner ring 31 is located at approximately the same position as the other end 80D of the spring 80. One end 32T of the outer ring 32 is in contact with the other end 80D of the spring 80 and is elastically supported in the rotational axis direction by the connecting surface 110ic of the inner circumferential portion 110i of the first housing 11 via the spring 80. In addition, in the rotational axis direction, the other end 31D of the inner ring 31 and the other end 32D of the outer ring 32 can move together with the rotating shaft 20.

[0028] As shown in FIGS. 1 and 3 , the second bearing 40 of the motor 1 is located on one side of the first bearing 30 in the axial direction. In this embodiment, the second bearing 40 is housed in the first cylindrical portion 121 of the second housing 12 and supported by the first cylindrical portion 121. The second bearing 40 includes an inner ring 41 on the inner circumferential side, an outer ring 42 on the outer circumferential side, and a plurality of rolling elements 43 located between the inner ring 41 and the outer ring 42 in the radial direction, and is a so-called ball bearing. The inner ring 41 of the second bearing 40 is attached to the rotating shaft 20 by, for example, a clearance fit. The outer ring 42 of the second bearing 40 is attached to the inner circumferential surface of the first cylindrical portion 121 by, for example, a clearance fit. In this embodiment, the rotating shaft 20 is movable along the rotational axis direction relative to the second bearing 40.

[0029] As shown in FIG. 3, the rotor 60 of the motor 1 is disposed between the first bearing 30 and the second bearing 40 in the direction of the rotation shaft. In this embodiment, the rotor 60 is housed in the space inside the stator 50. The rotor 60 has a tubular (cylindrical in this embodiment) magnet 61 fixed to the rotation shaft 20. Therefore, the rotor 60 and the rotation shaft 20 can rotate integrally around the central axis of the rotation shaft 20. In this embodiment, the outer shape or size (e.g., outer diameter) of the rotor 60 (magnet 61) is smaller than the outer shape or size (e.g., diameter) of the second inner circumferential surface 110ib (see FIG. 4) of the inner circumferential portion 110i of the first housing 11.

[0030] 2 and 3, the stator 50 of the motor 1 is disposed between the first bearing 30 and the second bearing 40 in the direction of the rotation axis. In this embodiment, a portion of the stator 50 on one side in the direction of the rotation axis is housed in the space inside the second cylindrical portion 122 of the second housing 12. In addition, a portion of the stator 50 on the other side in the direction of the rotation axis is disposed in the space inside the connecting portion 13 that connects the first housing 11 and the second housing 12.

[0031] The stator 50 includes a stator core 51 and an insulator 52. The stator core 51 is formed of an annular magnetic material extending in the rotational axis direction. The stator core 51 may be formed of a single magnetic material, or may be formed as a laminated body in which multiple magnetic materials, such as electromagnetic steel sheets, are stacked in the rotational axis direction. The insulator 52 covers the stator core 51 from both one and the other axial sides. However, in this embodiment, the inner circumferential surface 51A and the outer circumferential surface 51B of the stator core 51 are exposed from the insulator 52. The inner circumferential surface 51A of the stator core 51 faces the outer circumferential surface 61A of the magnet 61 of the rotor 60 in the radial direction via an air gap. A coil 53 is attached to a portion of the stator core 51 covered by the insulator 52. A current is supplied to the coil 53 via a circuit board (not shown) or the like.

[0032] Three protrusions 521 protrude radially outward (toward the opposite side from the rotary shaft 20) from the other end 52D of the insulator 52. The three protrusions 521 are provided corresponding to the three connecting portions 13 of the housing 10 described above, and are provided at approximately equal intervals in the circumferential direction of the insulator 52. Each of the three protrusions 521 is formed in a tubular shape (cylindrical in this embodiment), and each of the three connecting portions 13 passes through a space inside each of the three protrusions 521. In this embodiment, with this configuration, the insulator 52 (i.e., the stator 50) is fixed to the housing 10.

[0033] The above-described configuration of the stator 50 is merely an example, and the present invention is not limited to this configuration.

[0034] 3, the rotary shaft 20 penetrates the through-hole 111 of the first housing 11, the space inside the second cylindrical portion 122 of the second housing 12, and the space inside the first cylindrical portion 121 of the second housing 12. One end 22 and the other end 21 of the rotary shaft 20 each protrude from the housing 10. The impeller 70 is fitted into the one end 22 of the rotary shaft 20 that protrudes from the housing 10. Therefore, the impeller 70 can rotate integrally with the rotary shaft 20 around the rotary shaft 20.

[0035] In the motor 1 described above, when a current is supplied to the coil attached to the insulator 52, magnetic interaction occurs between the stator core 51 of the stator 50 and the magnet 61 of the rotor 60, causing the rotor 60, the rotating shaft 20 fixed to the rotor 60, the impeller 70 fitted to the rotating shaft 20, the ring 90 fixed to the rotating shaft 20, and the inner ring 31 of the first bearing 30 fixed to the ring 90 to rotate integrally around the rotating shaft 20. As a result of the rotation of the impeller 70, as shown in FIG. 3 , the air around the motor 1 becomes an airflow AF, which flows from one side to the other in the direction of the rotational shaft via the multiple stator vanes 120. A thrust force SF, which is a reaction force against the airflow AF, acts on the rotating shaft 20 from the other side to one side in the direction of the rotational shaft. That is, this thrust force SF presses the inner ring 31 of the first bearing 30, which is fixed to the rotating shaft 20 via the ring 90, toward one side in the rotational axis direction, and accordingly, the outer ring 32 of the first bearing 30 is also pressed toward one side in the rotational axis direction. Here, as described above, one end 32T of the outer ring 32 of the first bearing 30 is in contact with the other end 80D of the spring 80, and is elastically supported in the rotational axis direction by the connecting surface 110ic of the inner circumferential portion 110i of the first housing 11 via the spring 80. Therefore, the spring 80 urges the outer ring 32 toward the other side in the rotational axis direction, as indicated by the black arrow in FIG. 4, against the outer ring 32 being pressed toward one side in the rotational axis direction. In other words, due to the force of this spring 80, the rotating shaft 20 is also urged toward the other side in the direction of the rotating shaft, as shown by the black arrow in Figure 4, and more specifically, the part of the rotating shaft 20 that is supported by the second bearing 40 is urged toward the other side in the direction of the rotating shaft by the spring 80.

[0036] Thus, with motor 1, when thrust force SF is applied, spring 80 acts to cancel out thrust force SF, thereby preventing rotating shaft 20, rotor 60, impeller 70, etc. from shifting in the direction of the rotation axis relative to housing 10 and stator 50. Therefore, with motor 1, stable performance can be obtained even when thrust force SF is applied.

[0037] Furthermore, with the motor 1, components such as the rotating shaft 20, the first bearing 30, and the rotor 60 can be replaced relatively easily, as will be described later. Therefore, even if the rotating shaft 20, the first bearing 30, the rotor 60, and the like deteriorate or wear, replacing them prevents the motor 1 from operating with the deteriorated or worn rotating shaft 20, the first bearing 30, the rotor 60, and the like, allowing the motor 1 to perform more stably. Furthermore, with the motor 1, as will be described later, deformation of the spring 80 is suppressed when the rotating shaft 20, the first bearing 30, the rotor 60, and the like are replaced. Therefore, the biasing force of the spring 80 is prevented from becoming unstable due to deformation of the spring 80, and as a result, the motor 1 can perform more stably.

[0038] Furthermore, with motor 1, the rotating shaft 20, first bearing 30, rotor 60, etc. can be replaced relatively easily, so there is no need to replace the entire motor even if the rotating shaft 20, first bearing 30, rotor 60, etc. deteriorate or wear out. Therefore, motor 1 is not only economically advantageous, but also environmentally advantageous, as waste is reduced by not having to replace the entire motor.

[0039] Next, an example of a method for replacing the rotating shaft 20, the first bearing 30, the rotor 60, etc. of the motor 1 will be described.

[0040] As described above, the other end 31D of the inner ring 31 and the other end 32D of the outer ring 32 of the first bearing 30 can move together with the rotating shaft 20 in the rotational axis direction, and the rotating shaft 20 can move along the rotational axis direction relative to the second bearing 40. Therefore, for example, by gripping the vicinity of the other end 21 of the rotating shaft 20 and pulling the rotating shaft 20 to the other side as shown in FIG. 5 , the rotating shaft 20 can be moved to the other side relative to the housing 10. At this time, the ring 90 is fixed to the rotating shaft 20, the first bearing 30 is fixed to the ring 90, and in this embodiment, the rotor 60 is also fixed to the rotating shaft 20. Therefore, when the rotating shaft 20 is pulled to the other side, the first assembly 2 including the rotating shaft 20, the ring 90, the first bearing 30, and the rotor 60 moves to the other side relative to the housing 10. As described above, the inner peripheral portion 110i of the first housing 11 forms a space (the space inside the third inner peripheral surface 110id) that is open to the other end 31D of the inner ring 31 and the other end 32D of the outer ring 32 of the first bearing 30. Therefore, by removing the impeller 70 from the rotating shaft 20 and then continuing to pull the rotating shaft 20 toward the other side, the first assembly 2 can be removed from the housing 10 via the space inside the third inner peripheral surface 110id. In this way, the first assembly 2 is removed from the motor 1, resulting in a first motor body 1A (see FIG. 6) (first step).

[0041] As described above, the outer shape or size (e.g., outer diameter) of the rotor 60 (magnet 61) is smaller than the outer shape or size (e.g., diameter) of the second inner circumferential surface 110ib of the inner circumferential portion 110i of the first housing 11. Furthermore, the inner circumferential portion 80A of the spring 80 and the second inner circumferential surface 110ib are substantially flush with each other. Therefore, when the first assembly 2 is removed from the housing 10 to form the first motor body 1A, the rotor 60 is prevented from hitting the spring 80 and causing deformation of the spring 80.

[0042] As described above, the outer shape or size (e.g., outer diameter) of the second portion 92 of the ring 90 is smaller than the diameter of the second inner circumferential surface 110ib. Furthermore, as described above, the inner circumferential portion 80A of the spring 80 and the second inner circumferential surface 110ib are substantially flush with each other. Therefore, when the first assembly 2 is removed from the housing 10 to form the first motor body 1A, the ring 90 is prevented from hitting the spring 80 and causing deformation of the spring 80.

[0043] Next, as shown in FIG. 6 , a second assembly 3 is prepared in which a rotor 60 and a ring 90 are fixed to the rotating shaft 20 (second step). This second assembly 3 may be an assembly in which only the first bearing 30 has been removed from the first assembly 2 removed in the first step. Furthermore, the second assembly 3 may not have the first bearing 30 and may be an assembly in which one or more of the rotating shaft 20, rotor 60, and ring 90 of the first assembly 2 have been replaced with new ones. In this second assembly 3, the rotor 60 is fixed to the rotating shaft 20 so that the outer peripheral surface of the magnet 61 faces the inner peripheral surface of the stator core 51 in the radial direction when the second assembly 3 is completely attached to the first motor body 1A. In addition, in the second assembly 3, the ring 90 is fixed to the rotating shaft 20 so that when the attachment of the second assembly 3 to the first motor body 1A is completed, the position of the other end 90D of the ring 90 and the position of the other end 80D of the spring 80 in the direction of the rotating shaft roughly coincide with each other.

[0044] 6, one end 22 of the rotating shaft 20 of the second assembly 3 is directed toward the housing 10, and the second assembly 3 is inserted into the housing 10 toward one side through the space inside the third inner circumferential surface 110id of the housing 10 (third step). At this time, for the reasons described above, the rotor 60 and ring 90 are prevented from hitting the spring 80, and therefore deformation of the spring 80 due to the rotor 60 and ring 90 hitting the spring 80 is prevented.

[0045] Then, as the second assembly 3 is inserted into the housing 10 toward one side in the rotational axis direction, eventually, one end 22 of the rotational shaft 20 passes through the space within the inner ring 41 of the second bearing 40, and one end 22 protrudes toward one side relative to the second bearing 40, as shown in Fig. 7. In this way, the attachment of the first assembly 2 to the first motor body 1A is completed, and the second motor body 1B is obtained (fourth step). In the second motor body 1B, the outer peripheral surface of the magnet 61 and the inner peripheral surface of the stator core 51 face each other in the radial direction, and the position of the other end 90D of the ring 90 and the position of the other end 80D of the spring 80 are generally aligned in the rotational axis direction.

[0046] Finally, the first bearing 30 is attached to the second motor body 1B (fifth step). Specifically, as shown in FIG. 8, the other end 21 of the rotating shaft 20 exposed from the first housing 11 is fitted into the space inside the inner ring 31 of the new first bearing 30. This first bearing 30 may be the first bearing 30 of the first assembly 2 removed in the first step, or it may be a new first bearing 30. In the latter case, the fifth step is a step of replacing the first bearing 30 with the new first bearing 30. In this example, adhesive is applied in advance to one end 31T of the inner ring 31 of the first bearing 30, and the first bearing 30 is inserted toward one side in the direction of the rotating shaft.

[0047] 4, one end 31T of the inner ring 31 of the first bearing 30 comes into contact with the other end 90D of the ring 90, and the inner ring 31 is fixed to the ring 90. In this way, the first bearing 30 is attached to the second motor body 1B, and the motor 1 is obtained in which the rotating shaft 20, the first bearing 30, the rotor 60, etc. have been replaced.

[0048] In this fifth step, because the ring 90 is fixed to the rotating shaft 20, even if the first bearing 30 is inserted toward one side in the direction of the rotation axis, the first bearing 30 is prevented from being inserted further to the one side than the position of the other end 90D of the ring 90. Here, as described above, in the second motor body 1B, the position of the other end 90D of the ring 90 and the position of the other end 80D of the spring 80 in the direction of the rotation axis generally coincide with each other. Therefore, the insertion of the first bearing 30 is prevented by the other end 90D of the ring 90, and therefore the spring 80 is prevented from being pressed more than necessary by the first bearing 30 and being deformed in the process of inserting the first bearing 30.

[0049] Thus, according to this embodiment, parts such as the rotating shaft 20, the first bearing 30, and the rotor 60 can be replaced relatively easily, and deformation of the spring 80 can be prevented during the process of replacing parts such as the rotating shaft 20, the first bearing 30, and the rotor 60.

[0050] Although the present invention has been described above using the above embodiment as an example, the present invention is not limited to this.

[0051] For example, in the above embodiment, an example has been described in which the inner circumferential portion 80A of the spring 80 and the second inner circumferential surface 110ib are substantially flush with each other. However, in the process of replacing the rotating shaft 20, the first bearing 30, the rotor 60, etc., the inner circumferential portion 80A of the spring 80 and the second inner circumferential surface 110ib do not have to be substantially flush with each other as long as the spring 80 is not deformed by the first bearing 30 or the rotor 60 when the first bearing 30 or the rotor 60 is inserted into the inner circumferential portion 110i.

[0052] Those skilled in the art can modify the motor of the present invention as appropriate based on conventionally known knowledge. As long as the motor of the present invention is still provided with the configuration of the present invention even after such modification, it is of course included in the scope of the present invention. [Explanation of symbols]

[0053] 1...motor, 10...housing, 20...rotating shaft, 30...first bearing (bearing), 31...inner ring, 31D...other end, 31T...one end, 32...outer ring, 32D...other end, 32T...one end, 33...rolling element, 40...second bearing, 50...stator, 60...rotor, 80...spring, 90...ring, 110i...inner periphery

Claims

1. A rotation axis; a ring fixed to the rotating shaft; a housing having an inner periphery; Springs and a bearing including rolling elements, and an inner ring and an outer ring, each having one end on the spring side in the direction of the rotation axis and the other end opposite to the one end; Equipped with the one end of the outer ring is elastically supported by the inner peripheral portion of the housing via the spring in the direction of the rotation axis, In the direction of the rotation axis, the one end of the inner ring is fixed to the ring, The other end of the inner ring and the other end of the outer ring are movable together with the rotation shaft.

2. 2. The motor according to claim 1, wherein the inner peripheral portion of the housing forms a space that is open to the other end of the inner ring and the other end of the outer ring in the direction of the rotation axis.

3. The bearing is a first bearing, A second bearing; a stator; A rotor, Equipped with the stator and the rotor are disposed between the first bearing and the second bearing in the direction of the rotation axis, 3. The motor according to claim 1, wherein the portion of the rotary shaft supported by the second bearing is biased in the rotary shaft direction by the spring.

Images