Motors and Axial Fans

Abstract

To provide a motor capable of facilitating a fixing work of a lead wire to a radial outer side surface of a housing.SOLUTION: A motor comprises a rotor, a stator, a lead wire 20, and a housing covering the rotor and the stator from the outward in a radial direction. The housing comprises: a first housing located at one side in an axial direction; and a second housing located at the other side in the axial direction. The first housing has a convex part 410 protruded toward the other side in the axial direction. The second housing has a recessed part 510 recessed toward the other side in the axial direction and penetrating in the radial direction. The convex part is arranged at the recessed part. The convex part has a front end face 411 facing the other side in the axial direction. The recessed part has a bottom face 511 facing the one side in the axial direction. The lead wire is arranged between the front end face and the bottom face when seen from the radial direction. At least a part of the front end face is arranged at a position shifted in the radial direction from a position opposed to the bottom face in the axial direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a motor and an axial flow fan. [Background technology]

[0002] A conventional motor includes a housing. The housing is composed of a first housing and a second housing. The first housing and the second housing are stacked on top of each other in the axial direction. The motor's lead wires are drawn out radially outward from between the first housing and the second housing (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-105974 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional motor described above, the lead wires are sandwiched between the first and second housings. This allows the lead wires to be held in place and prevent them from shifting position. However, because a load is applied to the lead wires between the first and second housings, it can be difficult to secure the lead wires to the radially outer surfaces of the housings.

[0005] An object of the present invention is to facilitate the process of fixing lead wires to the radially outer surface of a housing. [Means for solving the problem]

[0006] An exemplary motor of the present invention includes a rotor rotatable in a circumferential direction about a central axis extending vertically, a stator for rotating the rotor, lead wires electrically connected to the stator, and a housing that radially covers the rotor and the stator. The housing includes a first housing located on one side in the axial direction and a second housing located on the other side in the axial direction. The first housing has a protrusion that protrudes toward the other side in the axial direction, and the second housing has a recess that is recessed toward the other side in the axial direction and penetrates radially. The protrusion is disposed in the recess. The protrusion has a tip surface facing the other side in the axial direction. The recess has a bottom surface facing one side in the axial direction. The lead wires are disposed between the tip surface and the bottom surface when viewed radially. At least a portion of the tip surface is disposed in a position radially shifted from a position axially facing the bottom surface.

[0007] Also, an exemplary motor of the present invention includes a rotor rotatable in a circumferential direction about a central axis extending vertically, a stator for rotating the rotor, lead wires electrically connected to the stator, and a housing covering the rotor and the stator from the radially outward direction. The housing includes a first housing located on one axial side and a second housing located on the other axial side. The first housing has a protrusion protruding toward the other axial side, and the second housing has a recessed portion recessed toward the other axial side and penetrating radially. The protrusion is disposed in the recessed portion. The protrusion has a tip surface facing the other axial side. The recessed portion has a bottom surface facing the one axial side. The lead wires are disposed between the tip surface and the bottom surface when viewed radially. The lead wires are drawn from the radially inner side of the housing to the radially outer side. The lead wires drawn from the housing are disposed on the radially outer surface of the housing. The housing has a lead wire retainer. The lead wire retaining portion is provided on at least one of the first housing and the second housing and is arranged radially outward of the lead wires drawn out from the housing. One circumferential end of the lead wire retaining portion is a free end that is arranged radially spaced apart from the radially outer surface of the housing, and the other circumferential end is a fixed end that is connected to the radially outer surface of the housing. A portion of the free end is inclined toward the fixed end when viewed radially.

[0008] An exemplary axial flow fan of the present invention includes the motor described above and rotor blades attached to the rotor. [Effects of the Invention]

[0009] According to the exemplary motor and axial flow fan of the present invention, the lead wires can be easily fixed to the radially outer surface of the housing. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view of an axial flow fan according to an embodiment. [Figure 2] FIG. 2 is an exploded perspective view of the axial flow fan according to the embodiment. [Figure 3] FIG. 3 is an exploded perspective view of the housing according to the embodiment. [Figure 4] FIG. 4 is a schematic diagram of a lead wire passing portion according to the embodiment. [Figure 5] FIG. 5 is a schematic diagram showing the positional relationship between the radially inner surface of the second housing and the protrusion according to the embodiment. [Figure 6] FIG. 6 is a schematic diagram showing the positional relationship between the radially inner surface of the second housing and the protrusion according to a modified example. [Figure 7] FIG. 7 is a plan view of the second housing according to the embodiment as viewed from the axial direction. [Figure 8] FIG. 8 is an enlarged cross-sectional view of the protrusions and recesses according to the embodiment and their surroundings cut along a plane perpendicular to the axial direction. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings.

[0012] In this specification, the direction in which the central axis CA of the motor 100 extends is referred to as the "axial direction," and the axial direction is defined as the up-down direction. However, this definition of the up-down direction does not limit the orientation or positional relationship of the motor 100 when in use.

[0013] In this specification, one axial direction is referred to as the “upper” direction, and the other axial direction is referred to as the “lower” direction. In addition, for each component, the end face of the upper end facing upward is referred to as the “upper end face,” and the end face of the lower end facing downward is referred to as the “lower end face.”

[0014] In this specification, the direction perpendicular to the central axis CA is referred to as the "radial direction." In addition, in the radial direction, the direction approaching the central axis CA is referred to as the "radially inner direction," and the direction moving away from the central axis CA is referred to as the "radially outer direction." In addition, for each component, the side surface facing radially inward is referred to as the "radially inner surface," and the side surface facing radially outward is referred to as the "radially outer surface."

[0015] In this specification, the circumferential direction about the central axis CA is referred to as the "circumferential direction."

[0016] <1. Axial flow fan> Fig. 1 is a perspective view of an axial fan 200 according to an embodiment of the present invention. Fig. 2 is an exploded perspective view of the axial fan 200 according to an embodiment of the present invention.

[0017] The axial flow fan 200 generates an airflow. The axial flow fan 200 includes a motor 100 and a rotor blade 210. The motor 100 is an outer rotor type. The rotor blade 210 is attached to the motor 100. Specifically, the rotor blade 210 is attached to a rotor 1, which will be described later. The motor 100 rotates the rotor blade 210. The rotation of the rotor blade 210 generates an airflow.

[0018] <2. Motor> The motor 100 includes a rotor 1, a stator 2, and a housing 3. The motor 100 also includes a shaft 10.

[0019] The shaft 10 is arranged along a central axis CA that extends vertically. The shaft 10 is supported by a shaft holder 110. The shaft holder 110 extends axially in a cylindrical shape along the central axis CA. A bearing (not shown) that rotatably supports the shaft 10 is attached to the radially inner surface of the shaft holder 110.

[0020] The rotor 1 is rotatable in the circumferential direction around a central axis CA that extends vertically. The rotor 1 has a yoke 11 that is a cylindrical yoke with a lid. A yoke lid portion 111, which is the lid portion of the yoke 11, is disk-shaped and centered on the central axis CA. The yoke lid portion 111 has an opening at the radial center. The shaft 10 is fixed to the radially inner surface of the opening of the yoke lid portion 111. A yoke cylindrical portion 112, which is the cylindrical portion of the yoke 11, extends downward from the radial outer edge of the yoke lid portion 111. A magnet (not shown) is fixed to the radially inner surface of the yoke cylindrical portion 112.

[0021] The stator 2 rotates the rotor 1. The stator 2 is annular and centered on a central axis CA that extends vertically, and is disposed radially inward of the rotor 1. The radially outer surface of the stator 2 faces the radially inner surface of the rotor 1. Specifically, the radially outer surface of the stator 2 faces a magnet fixed to the radially inner surface of the yoke 11. The radially inner surface of the stator 2 is fixed to the radially outer surface of the shaft holder 110.

[0022] The stator 2 includes a stator core 21, an insulator 22, a coil 23, and a circuit board 24. The stator core 21 is an annular magnetic body centered on a central axis CA, and is a laminated body in which a plurality of plate-shaped electromagnetic steel sheets are stacked in the axial direction. The radially outer surface of the stator core 21 faces the magnet in the radial direction. The radially inner surface of the stator core 21 is fixed to the radially outer surface of the shaft holder 110.

[0023] The insulator 22 covers at least a portion of the stator core 21. The insulator 22 is an insulating member made of resin or the like. The coil 23 is formed by winding a conductive wire around the stator core 21 with the insulator 22 interposed therebetween. The circuit board 24 is electrically connected to the coil 23. Various electronic components are mounted on the circuit board 24.

[0024] The housing 3 covers the rotor 1 and the stator 2 from the radially outer side. The housing 3 also covers the rotor blades 210 attached to the rotor 1 from the radially outer side.

[0025] The motor 100 includes lead wires 20 (see FIG. 4). The lead wires 20 are electrically connected to the stator 2. Specifically, a plurality of lead wires 20 are connected to a circuit board 24. The lead wires 20 are drawn from the inside of the motor 100 to the outside. That is, the lead wires 20 are drawn from the radially inner side of the housing 3 to the radially outer side.

[0026] <3. Housing configuration> FIG. 3 is an exploded perspective view of the housing according to the embodiment.

[0027] The housing 3 includes a first housing 4 and a second housing 5. The first housing 4 is located on one side in the axial direction. The second housing 5 is located on the other side in the axial direction. That is, the first housing 4 is located on the upper side. The second housing 5 is located on the lower side. The first housing 4 and the second housing 5 are joined to each other in the axial direction.

[0028] The housing 3 has a cylindrical portion 300 centered on a central axis CA. The cylindrical portion 300 covers the rotor 1 and the stator 2 from the outside in the radial direction.

[0029] The first housing 4 has a first cylindrical portion 400 which is a portion on one axial side of the cylindrical portion 300. The second housing 5 has a second cylindrical portion 500 which is a portion on the other axial side of the cylindrical portion 300. The first cylindrical portion 400 and the second cylindrical portion 500 are joined to each other in the axial direction.

[0030] The rotor 1 is fitted with rotor blades 210. Therefore, the rotor blades 210 are covered from the radially outer side by the tubular portion 300. The tubular portion 300 guides the airflow generated by the rotation of the rotor blades 210 in the axial direction.

[0031] The second housing 5 holds the shaft holder 110. In other words, the second housing 5 holds the stator 2. Specifically, the second housing 5 has a base portion 501 that holds the stator 2. For example, the base portion 501 is the same member as the second housing 5 and is formed integrally with the second housing 5.

[0032] 4. Lead wire retention structure by housing FIG. 4 is a schematic diagram of a lead wire insertion portion 310 according to the embodiment. FIG. 5 is a schematic diagram showing the positional relationship between a radially inner side surface 5a of a second housing 5 according to the embodiment and a protrusion 410. FIG. 6 is a schematic diagram showing the positional relationship between a radially inner side surface 5a of a second housing 5 according to a modified example and a protrusion 410. FIGS. 5 and 6 are cross-sectional views taken along line AA' in FIG. 4. In FIGS. 5 and 6, the left side of the drawings corresponds to the radially inner side, and the right side of the drawings corresponds to the radially outer side. FIG. 7 is a plan view of the second housing 5 according to the embodiment as seen from the axial direction. FIG. 8 is an enlarged cross-sectional view of the protrusion 410, the recess 510, and their surroundings according to the embodiment, cut along a plane perpendicular to the axial direction.

[0033] <4-1. Lead wire passage> The housing 3 has a lead wire passing portion 310. The lead wire passing portion 310 is a through hole that penetrates the housing 3 in the radial direction. The lead wire 20 is passed through the through hole of the lead wire passing portion 310. In other words, the lead wire 20 is arranged in the lead wire passing portion 310. The lead wire 20 is drawn from the radially inner side of the housing 3 to the radially outer side through the lead wire passing portion 310. The lead wire passing portion 310 is composed of a first housing 4 and a second housing 5.

[0034] Specifically, the first housing 4 has a protrusion 410 that protrudes toward the other side in the axial direction. The protrusion 410 is a portion that protrudes downward from the lower end surface of the first cylindrical portion 400. The protrusion 410 has a tip surface 411 that faces the other side in the axial direction. The tip surface 411 is the lower end surface of the protrusion 410.

[0035] The second housing 5 also has a recess 510 that is recessed toward the other axial side and penetrates radially. Specifically, the recess 510 is recessed from one axial end face of the second cylindrical portion 500 toward the other axial side. In other words, the recess 510 is a portion that is recessed downward from the upper end face of the second cylindrical portion 500. The recess 510 has a bottom surface 511 facing one axial side. The protrusion 410 is disposed in the recess 510.

[0036] The lead wire passing portion 310 is composed of a protrusion 410 and a recess 510. In other words, the through hole of the lead wire passing portion 310 is composed of a gap generated in the axial direction between the tip face 411 and the bottom face 511 when viewed from the radial direction. The lead wire 20 is disposed between the tip face 411 and the bottom face 511 when viewed from the radial direction. The lead wire 20 is drawn from the radially inner side of the housing 3 to the radially outer side through the gap between the tip face 411 and the bottom face 511 in the axial direction.

[0037] Here, the protrusion 410 is disposed in the recess 510. However, at least a part of the tip surface 411 does not face the bottom surface 511 in the axial direction. In other words, at least a part of the tip surface 411 is disposed in a position radially shifted from a position facing the bottom surface 511 in the axial direction. In this configuration, the axial constraint is weakened for at least a part of the lead wire 20 disposed in the lead wire passing portion 310.

[0038] This prevents excessive load from being applied to the lead wire 20 drawn from the radially inner side to the radially outer side of the housing 3. As a result, the lead wire 20 can be easily drawn out from the housing 3 and laid on the radially outer surface of the housing 3. In other words, the lead wire 20 drawn out from the housing 3 can be easily fixed to the radially outer surface of the housing 3.

[0039] Further, the recess 510 has a notch 511a in the bottom surface 511. The notch 511a of the recess 510 penetrates in the axial direction and is recessed radially outward from the radially inner surface of the second housing 5. Specifically, the notch 511a of the recess 510 is recessed radially outward from the radially inner surface of the second cylindrical portion 500. That is, when viewed from the axial direction, the recess 510 has a region where the bottom surface 511 is present and a region where the bottom surface 511 is missing. The region of the recess 510 where the bottom surface 511 is missing is the notch 511a.

[0040] At least a part of the tip surface 411 is disposed at a position axially facing the notched portion 511a of the recess 510. In other words, at least a part of the tip surface 411 does not face the bottom surface 511. This makes it easy to dispose at least a part of the tip surface 411 at a position radially shifted from the position axially facing the bottom surface 511.

[0041] For example, the entire tip surface 411 is disposed at a position axially facing the notched portion 511a of the recess 510. In other words, the entire tip surface 411 does not axially face the bottom surface 511. With this configuration, it is possible to further prevent an excessive load from being applied to the lead wire 20 drawn out from the housing 3.

[0042] Note that a part of the tip surface 411 may be disposed axially opposite the bottom surface 511. That is, a part of the tip surface 411 may be axially opposite the bottom surface 511, and another part may be axially opposite the notch 511a of the recess 510.

[0043] In the configuration of the embodiment shown in Fig. 5, the surface 410a of the protrusion 410 facing radially inward is flush with the radially inner surface 5a of the second housing 5. This prevents steps from occurring on the radially inner surface of the housing 3, making it possible to prevent the airflow from becoming unstable radially inward of the housing 3. As a result, the air blowing efficiency of the axial flow fan 200 is improved. In addition, it is possible to prevent the protrusion 410 from coming into contact with the rotor blades 210.

[0044] 6 can be employed as a modified example. In this modified example, the radially inward facing surface 410a of the protrusion 410 is disposed radially outward from the radially inner surface 5a of the second housing 5. In other words, the radially inward facing surface 410a of the protrusion 410 does not have to be flush with the radially inner surface 5a of the second housing 5. In yet other words, it is sufficient that the radially inward facing surface 410a of the protrusion 410 does not protrude radially inward from the radially inner surface 5a of the second housing 5.

[0045] In this modification, a step is formed on the radially inner surface of the housing 3. However, since the protrusions 410 do not protrude radially inward from the radially inner surface 5a of the second housing 5, the protrusions 410 can be prevented from coming into contact with the rotor blades 210.

[0046] When the notched portion 511a of the recessed portion 510 and the tip surface 411 are opposed to each other in the axial direction to radially shift the tip surface 411 relative to the bottom surface 511, the greater the radial thickness of the protruding portion 410, the greater the radial width of the notched portion 511a of the recessed portion 510 needs to be. In other words, the greater the radial thickness of the protruding portion 410, the smaller the radial width of the bottom surface 511 needs to be. However, if the radial width of the bottom surface 511 is small, the strength of the portion of the second housing 5 around the recessed portion 510 decreases.

[0047] Therefore, the radial thickness T of the protrusion 410 is equal to or less than half the radial opening width W of the recess 510 when viewed from the axial direction (see FIG. 8). This prevents the radial width of the bottom surface 511 from becoming too small. As a result, it is possible to prevent a decrease in the strength of the portion of the second housing 5 around the recess 510.

[0048] 3 and 4, the protrusion 410 has a first outer surface 421 facing one side in the circumferential direction and a second outer surface 422 facing the other side in the circumferential direction. The recess 510 has a first inner surface 521 facing one side in the circumferential direction and a second inner surface 522 facing the other side in the circumferential direction. The first outer surface 421 and the second inner surface 522 face each other in the circumferential direction. The second outer surface 422 and the first inner surface 521 face each other in the circumferential direction. The first outer surface 421 and the second inner surface 522 may be in at least partial contact with each other. The second outer surface 422 and the first inner surface 521 may be in at least partial contact with each other.

[0049] When attaching the first housing 4 to the second housing 5, the protrusion 410 is placed from above into the recess 510. For example, the protrusion 410 is inserted into the recess 510 while being guided by the first inner surface 521 and the second inner surface 522.

[0050] Here, the protrusion 410 has a tapered shape from one axial side to the other when viewed from the radial direction. That is, the tip portion, which is the lower portion of the protrusion 410, has a smaller circumferential width than the base portion, which is the upper portion.

[0051] Specifically, the first outer surface 421 has an upper surface 4211 parallel to the axial direction and a lower surface 4212 inclined relative to the axial direction. In other words, the first outer surface 421 has an inclined surface 4212 that inclines toward the other circumferential side as it approaches the other axial side. On the other hand, the second outer surface 422 is a surface parallel to the axial direction.

[0052] By providing an inclined surface 4212 on the first outer surface 421 of the convex portion 410, the convex portion 410 has a tapered shape from one side to the other in the axial direction, making it easier to insert the convex portion 410 into the recess 510 when attaching the first housing 4 to the second housing 5.

[0053] Furthermore, by making the second outer surface 422 of the protrusion 410 a surface parallel to the axial direction, when the protrusion 410 is inserted into the recess 510, the protrusion 410 can be guided linearly in the axial direction. This facilitates the insertion of the protrusion 410 into the recess 510. In other words, the attachment of the second housing 5 to the first housing 4 is facilitated.

[0054] <4-2. Lead wire clamp> The lead wire 20 drawn out from the housing 3 is arranged along the radially outer surface of the housing 3. Specifically, the lead wire 20 extends from the through-hole of the lead wire-passing portion 310 to one side in the axial direction. In other words, the lead wire 20 extends radially outward from the housing 3, from the second housing 5 toward the first housing 4.

[0055] Furthermore, the lead wires 20 are fixed to the radially outer surface of the housing 3. In other words, the lead wires 20 are held so as not to be separated from the radially outer surface of the housing 3.

[0056] Specifically, as shown in FIG. 1 , the housing 3 has a lead wire pressing portion 320. The lead wire pressing portion 320 is provided on at least one of the first housing 4 and the second housing 5. The lead wire pressing portion 320 is disposed radially outward of the lead wire 20 drawn out from the housing 3 (see FIG. 8 ). In other words, at least a portion of the lead wire 20 is pressed from the radially outward direction to the radially inward direction by the lead wire pressing portion 320. This makes it possible to easily fix the lead wire 20 to the radially outer surface of the housing 3.

[0057] In this way, the lead wire 20 is pressed by the lead wire pressing portion 320 on the radially outer side of the housing 3, and is thereby fixed to the radially outer surface of the housing 3. In this fixing method, it is necessary to insert the lead wire 20 between the radially outer surface of the housing 3 and the lead wire pressing portion 320.

[0058] Therefore, one circumferential end of the lead wire pressing portion 320 is a free end 321 that is disposed at a distance in the radial direction from the radially outer surface of the housing 3, and the other circumferential end is a fixed end 322 that is connected to the radially outer surface of the housing 3 (see FIG. 3). A part of the free end 321 is inclined circumferentially with respect to the axial direction.

[0059] For example, lead wire retaining portion 320 is the same member as housing 3 and is formed integrally with housing 3. Fixed end portion 322 extends from a corner portion of housing 3. Lead wire retaining portion 320 elastically deforms in directions moving away from and toward the radially outer surface of housing 3, with fixed end portion 322 as a fulcrum.

[0060] With this configuration, when the lead wire 20 is fixed to the radially outer surface of the housing 3, the lead wire 20 can be inserted from the free end 321 side between the radially outer surface of the housing 3 and the lead wire pressing portion 320. In addition, at this time, since a part of the free end 321 is inclined toward the fixed end 322 side, the work of inserting the lead wire 20 between the radially outer surface of the housing 3 and the lead wire pressing portion 320 becomes easy.

[0061] The radially outer surface of the housing 3 has a wiring portion 30 recessed radially inward. The recess that constitutes the wiring portion 30 extends in the axial direction. That is, the housing 3 has a groove extending in the axial direction as the wiring portion 30. The lead wire pressing portion 320 is disposed at a position radially opposite the wiring portion 30. This allows a wide gap to be secured between the radially outer surface of the housing 3 and the lead wire pressing portion 320. As a result, the lead wire 20 can be easily disposed between the radially outer surface of the housing 3 and the lead wire pressing portion 320.

[0062] The groove serving as the wiring portion 30 extends upward from the through-hole of the lead wire-passing portion 310. In other words, the bottom surface of the groove serving as the wiring portion 30 is formed by a part of the radially outer surface of the first housing 4 and the radially outer surface of the protrusion 410. In other words, the wiring portion 30 is provided on the radially outer surface of the first housing 4.

[0063] The wiring portion 30 has a first wiring portion 31 and a second wiring portion 32 that is thicker in the radial direction than the first wiring portion 31 (see FIG. 3). The second wiring portion 32 is disposed on one axial side of the first wiring portion 31. That is, the upper side of the wiring portion 30 in the first housing 4 has a thicker radial direction than the lower side of the wiring portion 30.

[0064] With this configuration, even if the wiring part 30 is provided on the first housing 4, it is possible to prevent a thin portion from being formed at the upper end of the first housing 4. In other words, it is possible to prevent a portion of the thickness of the outer edge of the intake and exhaust port from being thin. This makes it possible to prevent vibration from occurring during rotation of the rotor blade 210.

[0065] Here, the lead wire pressing portion 320 has a first lead wire pressing portion 420 and a second lead wire pressing portion 520 (see FIG. 3). The first lead wire pressing portion 420 is provided on the first housing 4. The second lead wire pressing portion 520 is provided on the second housing 5. This makes it possible to press the lead wire 20 on both the first housing 4 side and the second housing 5 side. This makes it possible to fix the lead wire 20.

[0066] Furthermore, the first lead wire pressing portion 420 has a first inclined portion 4201 that inclines toward the fixed end 322 as it moves toward the other axial side when viewed from the radial direction, and the second lead wire pressing portion 520 has a second inclined portion 5201 that inclines toward the fixed end 322 as it moves toward one axial side when viewed from the radial direction. That is, the free ends 321 of both the first lead wire pressing portion 420 and the second lead wire pressing portion 520 are inclined toward the fixed end 322 when viewed from the radial direction. This makes it easy to insert the lead wire 20 between the radially outer surface of the housing 3 and the lead wire pressing portion 320, even if the first housing 4 and the second housing 5 are provided with the first lead wire pressing portion 420 and the second lead wire pressing portion 520, respectively.

[0067] Furthermore, the first inclined portion 4201 is disposed on the other axial side of the first lead wire pressing portion 420, and the second inclined portion 5201 is disposed on one axial side of the second lead wire pressing portion 520 (see FIG. 1). In this configuration, the lead wire pressing portion 320 has a shape in which the approximate central portion in the axial direction is recessed in the circumferential direction when viewed from the radial direction. This makes it easier to insert the lead wire 20 from the approximate central portion in the axial direction of the lead wire pressing portion 320. Furthermore, the lead wire 20 can be pressed down at the upper and lower portions of the lead wire pressing portion 320.

[0068] Furthermore, the first lead wire pressing portion 420 and the second lead wire pressing portion 520 are arranged continuously in the axial direction (see FIG. 1). For example, the lower end surface of the first lead wire pressing portion 420 and the upper end surface of the second lead wire pressing portion 520 may be in contact with each other. This allows the lead wire 20 to be reliably fixed. Furthermore, by making the first lead wire pressing portion 420 and the second lead wire pressing portion 520 continuous in the axial direction, the exposed portion of the lead wire 20 can be reduced. This makes it possible to prevent the lead wire 20 from coming into contact with other members (not shown) arranged radially outward from the lead wire pressing portion 320. In other words, the lead wire 20 can be protected by the lead wire pressing portion 320.

[0069] Furthermore, the circumferential width of the first lead wire pressing portion 420 is larger than the circumferential width of the second lead wire pressing portion 520. In other words, the circumferential width of the second lead wire pressing portion 520 is smaller than the circumferential width of the first lead wire pressing portion 420. Note that the circumferential width of the second lead wire pressing portion 520 is the maximum circumferential width of the first lead wire pressing portion, and the circumferential width of the second lead wire pressing portion 520 is the maximum circumferential width of the second lead wire pressing portion 520.

[0070] When the lead wire 20 is fixed to the radially outer surface of the housing 3, the lead wire 20 is pulled out from the second housing 5. In this case, if the circumferential width of the second lead wire pressing portion 520 is small, the lead wire 20 can be easily routed along the radially outer surface of the housing 3. Furthermore, because the circumferential width of the first lead wire pressing portion 420 is large, the lead wire 20 can be reliably fixed by the first lead wire pressing portion 420 even if the circumferential width of the second lead wire pressing portion 520 is reduced.

[0071] <4-3.Regulation Department> The recess 510 has a restricting portion 530 (see FIGS. 7 and 8). The restricting portion 530 protrudes in the circumferential direction. The restricting portion 530 is provided on at least one of the first inner surface 521 and the second inner surface 522. That is, at least one of the first inner surface 521 and the second inner surface 522 has a restricting portion 530 protruding in the circumferential direction. For example, the restricting portion 530 is provided on both the first inner surface 521 and the second inner surface 522. The restricting portion 530 of the first inner surface 521 protrudes toward the second inner surface 522. The restricting portion 530 of the second inner surface 522 protrudes toward the first inner surface 521. That is, the restricting portion 530 is a protruding portion protruding in the circumferential direction from each of the first inner surface 521 and the second inner surface 522.

[0072] The restricting portion 530 is disposed radially outward from the protruding portion 410 and faces the protruding portion 410 in the radial direction. As a result, even if the protruding portion 410 deforms radially outward, the restricting portion 530 restricts the radially outward deformation of the protruding portion 410. As a result, deformation of the first housing 4 can be suppressed. The restricting portion 530 may come into contact with the protruding portion 410.

[0073] <5.Other> The embodiments of the present invention have been described above. However, the scope of the present invention is not limited to the above-described embodiments. The present invention can be implemented by adding various modifications within the scope of the gist of the invention. Furthermore, the above-described embodiments can be combined in any appropriate manner. [Industrial Applicability]

[0074] The present invention can be used, for example, as a motor for an axial flow fan. [Explanation of symbols]

[0075] 1 rotor 2 stator 3. Housing 4. First Housing 5 Second Housing 20 lead wire 30 Wiring section 31 1st wiring section 32 2nd wiring section 100 motor 200 axial fan 210 Moving blade 300 Cylinder 320 Lead wire holder 321 Free end 322 Fixed end 400 1st cylinder part 410 Convex part 411 Tip surface 420 First lead wire holder 421 1st outer surface 422 Second outer surface 500 2nd cylinder part 510 recess 511 bottom 511a Notch 520 Second lead wire holder 521 1st inner surface 522 2nd inner surface 530 Regulatory Department 4201 1st slope section 5201 2nd slope part CA center axis

Claims

1. a rotor that can rotate in a circumferential direction around a central axis that extends vertically; a stator that rotates the rotor; a lead wire electrically connected to the stator; a housing that covers the rotor and the stator from the outside in the radial direction, The housing includes: a first housing located on one side in the axial direction; a second housing located on the other side in the axial direction, the first housing has a protrusion that protrudes toward the other side in the axial direction, the second housing has a recess that is recessed toward the other side in the axial direction and penetrates in a radial direction, The protrusion is disposed in the recess, the protrusion has a tip surface facing the other side in the axial direction, the recess has a bottom surface facing one side in the axial direction, the lead wire is disposed between the tip surface and the bottom surface as viewed in the radial direction, At least a portion of the tip end surface is disposed at a position displaced in the radial direction from a position facing the bottom surface in the axial direction, The recess has a notch on the bottom surface, the notch portion penetrates the second housing in the axial direction and is recessed from a radially inner surface of the second housing toward the radially outward direction, At least a portion of the tip end surface is disposed at a position opposite to the notch portion in the axial direction, A motor, wherein a surface of the protrusion facing inward in the radial direction is positioned radially outward from a radially inner surface of the second housing.

2. the housing has a cylindrical portion centered on the central axis, the cylindrical portion covers the rotor and the stator from the radially outer side, the first housing has a first cylindrical portion that is a portion of the cylindrical portion on one side in the axial direction, the second housing has a second cylindrical portion that is a portion of the cylindrical portion on the other side in the axial direction, the recess is recessed from one end face of the second cylindrical portion in the axial direction toward the other end face in the axial direction, the notch portion is recessed from a radially inner surface of the second cylindrical portion toward the radially outward direction, The motor according to claim 1 , wherein the radial thickness of the protrusion is equal to or less than half the radial opening width of the recess when viewed in the axial direction.

3. The convex portion is a first outer surface facing one side in the circumferential direction; a second outer surface facing the other side in the circumferential direction, the first outer surface has an inclined surface that inclines toward the other side in the circumferential direction as it approaches the other side in the axial direction, The motor according to claim 1 , wherein the second outer surface is a surface parallel to the axial direction.

4. The lead wires are drawn from the radially inner side of the housing to the radially outer side, the lead wires extending from the housing are disposed on a radially outer surface of the housing; the housing has a lead wire retaining portion, The lead wire pressing portion is provided on at least one of the first housing and the second housing, The motor according to any one of claims 1 to 3, wherein the lead wire is disposed radially outward from the housing.

5. one end of the lead wire pressing portion in the circumferential direction is a free end that is disposed at a distance from the radially outer surface of the housing, and the other end of the lead wire pressing portion is a fixed end that is connected to the radially outer surface of the housing, The motor according to claim 4 , wherein a portion of the free end is inclined in the circumferential direction with respect to the axial direction.

6. The radially outer surface of the housing has a wiring portion recessed radially inward, The motor according to claim 4 or 5, wherein the lead wire retaining portion is disposed at a position facing the wiring portion in the radial direction.

7. A rotor that can rotate in a circumferential direction around a central axis that extends vertically; a stator that rotates the rotor; a lead wire electrically connected to the stator; a housing that covers the rotor and the stator from the outside in the radial direction, The housing includes: a first housing located on one side in the axial direction; a second housing located on the other side in the axial direction, the first housing has a protrusion that protrudes toward the other side in the axial direction, the second housing has a recess that is recessed toward the other side in the axial direction and penetrates in a radial direction, The protrusion is disposed in the recess, the protrusion has a tip surface facing the other side in the axial direction, the recess has a bottom surface facing one side in the axial direction, the lead wire is disposed between the tip surface and the bottom surface as viewed in the radial direction, At least a portion of the tip end surface is disposed at a position displaced in the radial direction from a position facing the bottom surface in the axial direction, The lead wires are drawn from the radially inner side of the housing to the radially outer side, the lead wires extending from the housing are disposed on a radially outer surface of the housing; the housing has a lead wire retaining portion, The lead wire pressing portion is provided on at least one of the first housing and the second housing, The lead wire is disposed radially outward from the housing. The radially outer surface of the housing has a wiring portion recessed radially inward, the lead wire pressing portion is disposed at a position facing the wiring portion in the radial direction, the wiring portion is provided on a radially outer surface of the first housing, The wiring portion is a first wiring portion; a second wiring portion having a thickness in the radial direction greater than that of the first wiring portion, The second wiring portion is disposed on one side of the first wiring portion in the axial direction.

8. A rotor that can rotate in a circumferential direction around a central axis that extends vertically; a stator that rotates the rotor; a lead wire electrically connected to the stator; a housing that covers the rotor and the stator from the outside in the radial direction, The housing includes: a first housing located on one side in the axial direction; a second housing located on the other side in the axial direction, the first housing has a protrusion that protrudes toward the other side in the axial direction, the second housing has a recess that is recessed toward the other side in the axial direction and penetrates in a radial direction, The protrusion is disposed in the recess, the protrusion has a tip surface facing the other side in the axial direction, the recess has a bottom surface facing one side in the axial direction, the lead wire is disposed between the tip surface and the bottom surface as viewed in the radial direction, At least a portion of the tip end surface is disposed at a position displaced in the radial direction from a position facing the bottom surface in the axial direction, The recessed portion is a first inner surface facing one side in the circumferential direction; a second inner surface facing the other side in the circumferential direction, At least one of the first inner surface and the second inner surface has a restricting portion that protrudes in the circumferential direction, The restricting portion is disposed radially outward of the protruding portion and faces the protruding portion in the radial direction.

9. a rotor that can rotate in a circumferential direction around a central axis that extends vertically; a stator that rotates the rotor; a lead wire electrically connected to the stator; a housing that covers the rotor and the stator from the outside in the radial direction, The housing includes: a first housing located on one side in the axial direction; a second housing located on the other side in the axial direction, the first housing has a protrusion that protrudes toward the other side in the axial direction, the second housing has a recess that is recessed toward the other side in the axial direction and penetrates in a radial direction, The protrusion is disposed in the recess, the protrusion has a tip surface facing the other side in the axial direction, the recess has a bottom surface facing one side in the axial direction, the lead wire is disposed between the tip surface and the bottom surface as viewed in the radial direction, The lead wires are drawn from the radially inner side of the housing to the radially outer side, the lead wires extending from the housing are disposed on a radially outer surface of the housing; the housing has a lead wire retaining portion, The lead wire pressing portion is provided on at least one of the first housing and the second housing, The lead wire is disposed radially outward from the housing. one end of the lead wire pressing portion in the circumferential direction is a free end that is disposed at a distance from the radially outer surface of the housing, and the other end of the lead wire pressing portion is a fixed end that is connected to the radially outer surface of the housing, a portion of the free end portion inclined in the circumferential direction with respect to the axial direction; The lead wire pressing portion is a first lead wire pressing portion provided on the first housing; a second lead wire pressing portion provided on the second housing, the first lead wire pressing portion has a first inclined portion that is inclined toward the fixed end portion as it moves toward the other side in the axial direction, as viewed from the radial direction; the second lead wire pressing portion has a second inclined portion that is inclined toward the fixed end portion as it moves toward one side in the axial direction, as viewed from the radial direction, the first inclined portion is disposed on the other side of the first lead wire pressing portion in the axial direction, the second inclined portion is disposed on one side of the second lead wire pressing portion in the axial direction, the first lead wire pressing portion and the second lead wire pressing portion are disposed continuously in the axial direction, The lead wire pressing portion has a shape in which a central portion in the axial direction is recessed in the circumferential direction when viewed from the radial direction.

10. The motor according to claim 9 , wherein the first lead wire pressing portion has a width in the circumferential direction greater than a width in the circumferential direction of the second lead wire pressing portion.

11. A motor according to any one of claims 1 to 10; and a rotor blade attached to the rotor.

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