WO2019111430A1

WO2019111430A1 - Electric motor and electric fan

Info

Publication number: WO2019111430A1
Application number: PCT/JP2018/018177
Authority: WO
Inventors: 光将浜崎; 昌也寺本
Original assignee: 三菱電機株式会社; 三菱電機ホーム機器株式会社
Priority date: 2017-12-04
Filing date: 2018-05-10
Publication date: 2019-06-13
Also published as: JP6863477B2; JPWO2019111430A1

Abstract

Provided is an electric motor in which, as a member used for fixing a bearing for supporting the rotating shaft of a rotor, a member can be used that does not have such a restriction that the coefficient of thermal expansion thereof is the same as that of the bearing. Accordingly, the electric motor is provided with: first and second bearings (400, 500) disposed within a housing (311) and rotatably supporting the shaft (332) of a rotor (330); and a cylindrical member (600) disposed between the first and second bearings while the shaft is rotatably inserted thereinto, and fixed inside the housing. The first and second bearings are provided with first and second outer rings (410, 510), respectively, and first and second inner rings (420, 520) fixed to the shaft, respectively. The cylindrical member presses the first outer ring toward the opposite side to the second bearing along an axial direction parallel to the shaft and presses the second outer ring toward the opposite side to the first bearing along the axial direction.

Description

Electric motor and electric blower

The present invention relates to an electric motor and an electric blower.

In a rotor assembly for a high speed compressor having a shaft on which an impeller, a rotor core and a bearing cartridge are mounted, the bearing cartridge is mounted between the impeller and the rotor core, and further, the bearing cartridge U.S. Pat. No. 6,097,014 discloses a bearing having a pair of bearings, a spring for applying a preload to each of the bearings, and a sleeve surrounding the bearings and fixed to the bearings.

Japanese Unexamined Patent Publication No. 2010-196707

However, in the technology as shown in Patent Document 1, the sleeve surrounding the bearing and the bearing are fixed. That is, the bearing is fixed by fixing the bearing to the sleeve in the radial direction perpendicular to the axial direction of the shaft. When the shaft supported by the bearing rotates at high speed, the bearing and the sleeve become hot. For this reason, in order to fix a bearing reliably by a sleeve, restrictions, such as having to use the raw material which is a thermal expansion coefficient equivalent to a bearing, arise in a sleeve.

The present invention has been made to solve such problems. The object is to obtain an electric motor and an electric blower that can use members that are used to fix a bearing that supports a rotary shaft of a rotor without having limitations such as a coefficient of thermal expansion equivalent to that of the bearing. .

The electric motor according to the present invention is disposed in the housing and rotatably supports the first bearing and the second bearing rotatably supporting the rotary shaft of the rotor, and the rotary shaft rotatably in the central through hole. A cylindrical member disposed between the first bearing and the second bearing in a passed-through state and fixed to the housing in the housing, the first bearing comprising a first member And a first inner ring fixed to the rotary shaft, the second bearing comprising a second outer ring and a second inner ring fixed to the rotary shaft; The cylindrical member presses the first outer ring along the axial direction parallel to the rotation axis toward the opposite side to the second bearing, and the second outer ring along the axial direction. It presses to the opposite side to said 1st bearing.

An electric blower according to the present invention includes the electric motor configured as described above, and a fan fixed to the rotating shaft.

According to the electric motor and the electric blower according to the present invention, it is possible to use, as members used for fixing the bearing that supports the rotary shaft of the rotor, one that has no restriction such as a coefficient of thermal expansion equivalent to the bearing Play an effect.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing of the electric blower provided with the electric motor which concerns on Embodiment 1 of this invention. It is a perspective view of an electric blower concerning Embodiment 1 of this invention. It is sectional drawing which expands and shows the principal part of the electric motor which concerns on Embodiment 1 of this invention. It is a perspective view which shows the cylindrical member of the electric motor which concerns on Embodiment 1 of this invention. It is a perspective view which shows another example of the cylindrical member of the electric motor which concerns on Embodiment 1 of this invention. It is sectional drawing which expands and shows the principal part of the motor which concerns on Embodiment 2 of this invention. It is a perspective view which shows the cylindrical member of the electric motor which concerns on Embodiment 2 of this invention. It is sectional drawing which expands and shows the principal part of the motor which concerns on Embodiment 3 of this invention. It is sectional drawing which expands and shows the principal part of the motor which concerns on Embodiment 4 of this invention. It is sectional drawing which expands and shows the principal part of the motor which concerns on Embodiment 5 of this invention. It is a perspective view which shows the cylindrical member of the electric motor which concerns on Embodiment 5 of this invention. It is a disassembled perspective view of the rotor assembly with which the electric motor which concerns on Embodiment 5 of this invention is provided.

An embodiment for carrying out the present invention will be described with reference to the attached drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and overlapping descriptions will be appropriately simplified or omitted. The present invention is not limited to the following embodiments, and various modifications can be made without departing from the spirit of the present invention.

Embodiment 1
1 to 5 relate to a first embodiment of the present invention, and FIG. 1 is a cross-sectional view of an electric blower provided with a motor, FIG. 2 is a perspective view of the electric blower, and FIG. 4 is a perspective view showing a cylindrical member of the motor, and FIG. 5 is a perspective view showing another example of the cylindrical member of the motor.

As shown in FIG. 1, the electric blower 100 according to Embodiment 1 of the present invention includes a blower unit 200 and a motor unit 300. The blower unit 200 includes a fan 210, a fan cover 220, and the like. The configuration of the blower unit 200 will be described later.

The motor unit 300 is a motor. That is, the electric blower 100 according to Embodiment 1 of the present invention includes the electric motor. Here, an example in which the motor unit 300, which is a motor, is a brushless DC motor will be described.

The motor unit 300 includes a frame 310 and a bracket 320 as shown in FIGS. 1 and 2. The frame 310 is a member that forms the outer shell of the motor unit 300. The main part of the frame 310 has a hollow cylindrical shape. One end of the frame 310 is open. As shown in FIG. 1, a housing 311 is provided on the other end side of the frame 310. The housing 311 is a cylindrical recess smaller than the main part of the frame 310.

A bracket 320 is attached to the aforementioned other end of the frame 310, that is, the side where the housing 311 is provided. The bracket 320 is fixed to the frame 310 by a screw or the like.

The motor unit 300 includes a rotor 330 and a stator 340. The rotor 330 is disposed at the center of the inner space of the frame 310. The rotor 330 comprises a rotor core 331. The rotor core 331 is a permanent magnet. A shaft 332 is fixed to the center of the rotor core 331. The shaft 332 is a rotation axis of the rotor 330.

The stator 340 is arranged to surround the rotor 330 in the inner space of the frame 310. The stator 340 is configured by winding a coil around a stator core that is an iron core. The stator 340 is for generating a magnetic force acting on the rotor 330.

Inside the housing 311, a first bearing 400, a second bearing 500 and a cylindrical member 600 are disposed. The first bearing 400 and the second bearing 500 are for rotatably supporting a shaft 332 which is a rotation shaft of the rotor 330. The portion of the shaft 332 opposite to the rotor core 331 is passed through the first bearing 400, the second bearing 500 and the cylindrical member 600. The shaft 332 of the rotor 330 is rotatably supported relative to the frame 310 by the housing 311, the first bearing 400, the second bearing 500 and the cylindrical member 600. Details of the support structure of the shaft 332 will be described later. A portion of the shaft 332 opposite to the rotor core 331 penetrates the first bearing 400, the second bearing 500 and the cylindrical member 600.

Next, the configuration of the blower unit 200 included in the electric blower 100 will be described. As shown in FIG. 1, the fan 210 of the blower unit 200 is attached to a portion of the shaft 332 penetrating the first bearing 400, the second bearing 500 and the cylindrical member 600 on the opposite side to the rotor core 331. There is. As shown in FIGS. 1 and 2, a fan cover 220 is attached to the bracket 320 so as to surround the fan 210. As shown in FIG. 1, a suction port 221 is formed in a portion of the fan cover 220 facing the center of the fan 210. In the fan cover 220, a guide blade 230 is attached along the outer periphery of the fan 210. The guide vanes 230 are for introducing the air drawn from the suction port 221 by the rotation of the fan 210 into the motor unit 300.

Next, the flow of air at the time of operation of electric blower 100 will be described. When the electric blower 100 operates, the rotor 330 and the shaft 332 rotate, and the fan 210 fixed to the shaft 332 rotates. When the fan 210 rotates, air is drawn into the fan cover 220 from the suction port 221. The drawn air blows from the center of the fan 210 to the outer periphery. The air blown out from the outer periphery of the fan 210 is guided to the guide vanes 230 and flows from the bracket 320 into the inside of the frame 310. An exhaust port (not shown) is formed on the side surface of the frame 310. The wind that has flowed into the inside of the frame 310 flows out of the exhaust port to the outside of the frame 310 and flows.

Next, the support structure of the shaft 332 by the housing 311, the first bearing 400, the second bearing 500 and the cylindrical member 600 will be described with reference to FIGS. 3 and 4. The housing 311 is a cylindrical recess as described above. The rotor core 331 side of the recess of the housing 311 is open so as to communicate with the internal space of the frame 310. The fan 210 side of the recess of the housing 311 is a housing bottom 312.

The first bearing 400 includes a first outer ring 410, a first inner ring 420, and a first rolling element 430. The first bearing 400 has an annular shape. The first outer ring 410 is an annular member having a diameter larger than that of the first inner ring 420. The first inner ring 420 is an annular member smaller in diameter than the first outer ring 410.

An annular space is formed between the first outer ring 410 and the first inner ring 420. In a space between the first outer ring 410 and the first inner ring 420, a plurality of first rolling elements 430 are disposed. Each first rolling element 430 has, for example, a spherical shape. Each first rolling element 430 is partially in contact with a recess provided on the inner peripheral surface of the first outer ring 410 and a recess provided on the outer peripheral surface of the first inner ring 420. As the first rolling element 430 rotates, the first inner ring 420 smoothly with respect to the first outer ring 410 while maintaining the relative positional relationship between the first outer ring 410 and the first inner ring 420. It can rotate.

A shaft 332 is passed through the inside of the first inner ring 420. The first inner ring 420 is fixed at a predetermined position of the shaft 332, for example, by press fitting. The first outer ring 410 is not fixed to the housing 311. Therefore, the first outer ring 410 is movable relative to the housing 311 as it is.

The configuration of the second bearing 500 is similar to that of the first bearing 400. That is, the second bearing 500 includes a second outer ring 510, a second inner ring 520, and a second rolling element 530. The second bearing 500 has an annular shape. The second outer ring 510 is an annular member having a larger diameter than the second inner ring 520. The second inner ring 520 is an annular member smaller in diameter than the second outer ring 510.

An annular space is formed between the second outer ring 510 and the second inner ring 520. In a space between the second outer ring 510 and the second inner ring 520, a plurality of second rolling elements 530 are disposed. Each second rolling element 530 has, for example, a spherical shape. Each second rolling element 530 is in contact with the inner circumferential surface of the second outer ring 510 and the outer circumferential surface of the second inner ring 520. As the second rolling element 530 rotates, the second inner ring 520 smoothly with respect to the second outer ring 510 while maintaining the relative positional relationship between the second outer ring 510 and the second inner ring 520. It can rotate.

A shaft 332 is passed through the inside of the second inner ring 520. The second inner ring 520 is fixed at a predetermined position of the shaft 332, for example, by press fitting. The second outer ring 510 is not fixed to the housing 311. Therefore, the second outer ring 510 is movable relative to the housing 311 as it is.

The fixed position of the first bearing 400 relative to the shaft 332 and the fixed position of the second bearing 500 are both predetermined. Therefore, the first bearing 400 and the second bearing 500 are fixed to the shaft 332 at predetermined intervals.

A cylindrical member 600 is disposed between the first bearing 400 and the second bearing 500. As shown in FIG. 4, the cylindrical member 600 is a cylindrical member in which a through hole 610 is formed in the central portion. As shown in FIG. 3, the shaft 332 passes through the through hole 610 of the cylindrical member 600. The inner diameter of the through hole 610 is larger than the outer diameter of the shaft 332. Thus, in the through hole 610 of the cylindrical member 600, the shaft 332 can freely rotate. That is, the cylindrical member 600 is disposed between the first bearing 400 and the second bearing 500 in a state in which the shaft 332 is rotatably passed in the through hole 610 formed in the center.

The cylindrical member 600 is fixed to the housing 311 in the housing 311. The cylindrical member 600 is fixed to the housing 311 by adhesion or press fitting, for example. The dimension of the cylindrical member 600 along the direction parallel to the shaft 332 (hereinafter also referred to as “axial direction”) is longer than the distance between the first bearing 400 and the second bearing 500 fixed to the shaft 332. . Therefore, the cylindrical member 600 presses the first outer ring 410 in the direction opposite to the second bearing 500 in the axial direction. At the same time, the cylindrical member 600 presses the second outer ring 510 in the axial direction toward the opposite side to the first bearing 400.

The outer diameter of the cylindrical member 600 is smaller than the outer diameter of the first bearing 400 and the second bearing 500. Here, the outer diameter of the first bearing 400 is the outer diameter of the first outer ring 410. Similarly, the outer diameter of the second bearing 500 is the outer diameter of the second outer ring 510. Therefore, the first bearing 400 and the second bearing 500 are not directly fixed to the housing 311.

With the first inner ring 420 and the second inner ring 520 fixed to the shaft 332 at a predetermined interval, the first outer ring 410 and the second outer ring between the first bearing 400 and the second bearing 500 The first bearing 400 and the second bearing 600 are provided by holding the cylindrical member 600 between the first bearing 400 and the second bearing 500 by providing the cylindrical member 600 for pressing the outer ring 510 of the first bearing 400. The cylindrical member 600 is fixed to the bearing 500 of FIG. The first bearing 400 and the second bearing 500 are fixed to the housing 311 by fixing the cylindrical member 600 to the housing 311. In other words, the first bearing 400 and the second bearing 500 are indirectly fixed to the housing 311 via the cylindrical member 600. And, by fixing the first bearing 400 and the second bearing 500 in such a structure, the first outer ring 410 and the second outer ring 510 do not receive a load perpendicular to the axial direction from the housing 311. .

Therefore, the first bearing 400 and the second bearing 500 are fixed in the housing 311 without fixing the first bearing 400 and the second bearing 500 to the housing 311 in the radial direction perpendicular to the axial direction of the shaft 332. it can. For this reason, it is possible to use the cylindrical member 600 which is a member used for fixing the bearing that supports the shaft 332 of the rotor without any restriction of the thermal expansion coefficient equivalent to that of the bearing. Specifically, for example, by adopting an aluminum alloy as the cylindrical member 600, the demand for weight reduction can be met.

In addition, the rotation of the first bearing 400 and the second bearing 500 can be stabilized by pressing the first outer ring 410 and the second outer ring 510 along the axial direction. That is, when the electric blower 100 is driven, this is interposed between the first outer ring 410, the first inner ring 420, the first outer ring 410, and the first inner ring 420 of the first bearing 400. It is possible to keep the position of the rolling element 430 appropriately and to allow the first inner ring 420 to smoothly rotate via the first rolling element 430 with respect to the first outer ring 410. The same applies to the second bearing 500.

As described above, when the fan 210 rotates, air is drawn into the fan cover 220 from the suction port 221. At this time, a force is drawn to the fan 210 toward the suction port 221 as a reaction. The fan 210 is fixed to the shaft 332, and the first inner ring 420 and the second inner ring 520 are fixed to the shaft 332. Therefore, when the fan 210 rotates, a force to move toward the fan 210, that is, a force along the axial direction acts on the first inner ring 420 and the second inner ring 520.

At this time, a force in the axial direction is previously applied to the first bearing 400 and the second bearing 500 by the cylindrical member 600. Therefore, even if the first inner ring 420 and the second inner ring 520 move toward the fan 210 as the fan 210 rotates, the first outer ring 410, the first inner ring 420, and the first rolling element 430 The relative positional relationship and the relative positional relationship between the second outer ring 510, the second inner ring 520, and the second rolling element 530 can be maintained, and the smooth rotation of the shaft 332 can be maintained.

In addition, as described above, the inner diameter of the cylindrical member 600 is larger than the outer diameter of the shaft 332. Then, the difference between the inner diameter of the cylindrical member 600 and the outer diameter of the shaft 332 is larger than the difference between the outer diameter of the cylindrical member 600 and the outer diameters of the first bearing 400 and the second bearing 500. It is good to do. By doing so, even if the central axis of the cylindrical member 600 and the central axis of the shaft 332 are temporarily shifted in the housing 311 at the time of assembly or the like, the first bearing 400 and the second bearing By abutting, the cylindrical member 600 and the shaft 332 do not come in contact with each other. Therefore, it can be suppressed that the cylindrical member 600 interferes with the smooth rotation of the shaft 332.

In the first embodiment, the second bearing 500 is disposed closer to the rotor core 331 of the rotor 330 than the first bearing 400. The surface of the first outer ring 410 opposite to the cylindrical member 600 is pressed against the housing bottom 312 of the housing 311. By doing so, alignment when attaching the rotor assembly (shaft 332, rotor core 331, first bearing 400, second bearing 500 and cylindrical member 600) to the frame 310 is facilitated.

The cylindrical member 600 may be crimped from the outside of the housing 311 and may be fixed in the housing 311. In this case, as shown in FIG. 5, a recess 620 is formed on the outer side surface of the cylindrical member 600. Then, the cylindrical member 600 is crimped at the position of the recess 620. By doing this, the crimped portion of the housing 311 protrudes into the recess 620 and the cylindrical member 600 is fixed. Therefore, the deformation of the cylindrical member 600 due to caulking can be suppressed. At this time, the recess 620 may be disposed at the above-mentioned axial center of the cylindrical member.

When the cylindrical member 600 is fixed to the housing 311 by caulking, the caulking position may be made to be axially symmetrical with respect to the shaft 332. Furthermore, in particular, when the cylindrical member 600 is fixed to the housing 311 by caulking, the cylindrical member 600 may be made of a material different from that of the housing 311, but desirably has a thermal expansion coefficient equivalent to that of the housing 311. By doing this, it is possible to suppress the occurrence of looseness in fixation of the cylindrical member 600 due to thermal expansion of the cylindrical member 600 and the housing 311.

Second Embodiment
6 and 7 relate to a second embodiment of the present invention, and FIG. 6 is an enlarged sectional view showing an essential part of the motor, and FIG. 7 is a perspective view showing a cylindrical member of the motor.

In the second embodiment described here, in the configuration of the first embodiment described above, convex portions are formed on both side surfaces of the cylindrical member on the first bearing side and the second bearing side, and these convex portions are formed. Are in contact with the first outer ring and the second outer ring, respectively. Hereinafter, the electric motor and the electric blower according to the second embodiment will be described focusing on differences from the first embodiment by taking as an example a case based on the configuration of the first embodiment.

In the electric motor and the electric blower according to Embodiment 2 of the present invention, as shown in FIGS. 6 and 7, a convex portion 630 is formed on the cylindrical member 600. The protrusions 630 are respectively formed on the surfaces corresponding to the two cylindrical bottom surfaces of the cylindrical member 600. The convex portion 630 is disposed near the outer periphery of these surfaces. Therefore, the inner peripheral side closer to the through hole 610 of these surfaces is recessed relative to the convex portion 630. Further, a recess 620 is continuously formed on the entire outer surface of the cylindrical member 600 over the entire circumference.

By arranging the cylindrical member 600 configured in this way between the first bearing 400 and the second bearing 500, as shown in FIG. It abuts on the first outer ring 410 and the second outer ring 510, respectively.

Further, a caulking portion 313 is formed in the housing 311. The caulking portion 313 is disposed at a position aligned with the recess 620 of the cylindrical member 600 in the housing 311. The housing 311 is deformed so as to project inward from the outside of the housing 311 at the caulking portion 313. The protrusion of the inner wall of the housing 311 at the caulking portion 313 is disposed in the recess 620 of the cylindrical member 600. Then, the cylindrical member 600 is fixed in the housing 311 by the caulking portion 313 and the concave portion 620.

The other configuration is the same as that of the first embodiment, and the description thereof is omitted here.

Also in the electric motor and the electric blower configured as described above, the same effects as in the first embodiment can be obtained. Furthermore, by providing the convex portion 630 in the cylindrical member 600, only the first outer ring 410 and the second outer ring 510 can be more reliably pressed by the cylindrical member 600. Therefore, the possibility of interference of the cylindrical member 600 with the rotation of the first inner ring 420 and the second inner ring 520 can be reduced, and the rotor 330 can be rotated smoothly.

Third Embodiment
FIG. 8 is a sectional view showing an essential part of a motor in an enlarged manner, according to Embodiment 3 of the present invention.

In the third embodiment described here, an elastic member is provided between the second outer ring and the cylindrical member in the configuration of the first embodiment or the second embodiment described above. Hereinafter, the motor and the electric blower according to the third embodiment will be described focusing on differences from the second embodiment, taking the case of the configuration of the second embodiment as an example.

In the electric motor and the electric blower according to Embodiment 3 of the present invention, as shown in FIG. 8, a spring 710 is provided between the cylindrical member 600 and the second bearing 500. The convex portion is not formed on the surface of the cylindrical member 600 on the second bearing 500 side. The spring 710 is a push spring having an annular shape. The spring 710 is specifically, for example, a spring washer.

The spring 710 is inserted between the cylindrical member 600 and the second bearing 500 in an elastically deformed state. Therefore, the spring 710 presses the second outer ring 510 in the axial direction to the opposite side to the first bearing 400. In other words, the cylindrical member 600 presses the second outer ring 510 in the axial direction opposite to the first bearing 400 via the spring 710. The spring 710 may be another elastic body, specifically, for example, rubber or the like.

A convex portion 630 is formed on the surface of the cylindrical member 600 on the first bearing 400 side. The cylindrical member 600 presses the first outer ring 410 in the axial direction to the side opposite to the second bearing 500 by the convex portion 630. The other configuration is the same as that of the second embodiment, and the description thereof is omitted here.

Also in the electric motor and the electric blower configured as described above, the same effects as in the first embodiment or the second embodiment can be obtained. Then, the force by which the cylindrical member 600 presses the second outer ring 510 can be stabilized by the spring 710 as an elastic member. Moreover, the vibration by rotation of the rotor 330 transmitted from the 2nd bearing 500 to the housing 311 can be suppressed, and the vibration of the outer case of a motor can be reduced.

Here, an example in which the spring 710 which is an elastic member is provided between the second outer ring 510 and the cylindrical member 600 has been described. However, the location where the elastic member is provided is not limited to this. The elastic member may be provided between the first outer ring 410 and the cylindrical member 600.

Fourth Embodiment
FIG. 9 is a cross-sectional view showing a main part of a motor in an enlarged manner, according to a fourth embodiment of the present invention.

In the fourth embodiment described here, in the configuration of any of the first to third embodiments described above, the space between the surface of the first outer ring opposite to the cylindrical member and the bottom of the housing An elastic member is provided. Hereinafter, the motor and the electric blower according to the fourth embodiment will be described focusing on differences from the third embodiment by taking as an example the case where the configuration of the third embodiment is based.

In the electric motor and the electric blower according to Embodiment 4 of the present invention, as shown in FIG. 9, a rubber 720 is provided between the first bearing 400 and the housing bottom portion 312. The rubber 720 is, for example, silicone rubber having an annular shape. The rubber 720 is inserted between the first bearing 400 and the housing bottom 312 in an elastically deformed state. The rubber 720 may be another elastic body, specifically, for example, a pressing spring or the like.
The other configuration is the same as that of the third embodiment, and the description thereof is omitted here.

Also in the electric motor and the electric blower configured as described above, the same effect as any one of Embodiment 1 to Embodiment 3 can be obtained. And the vibration by rotation of the rotor 330 transmitted to the housing bottom part 312 from the 1st bearing 400 can be suppressed, and the vibration of the shell part of a motor can be reduced. In addition, the frictional force between the rubber 720 and the first bearing 400 can stabilize the position of the first bearing 400.

Embodiment 5
10 to 12 relate to Embodiment 5 of the present invention, and FIG. 10 is an enlarged sectional view showing an essential part of the motor, FIG. 11 is a perspective view showing a cylindrical member of the motor, and FIG. It is an exploded perspective view of a rotor assembly with which a motor is provided.

In the fifth embodiment described here, the first outer ring and the cylindrical member, and the second outer ring and the cylindrical member in the configuration of any of the first to fourth embodiments described above. Elastic members are provided in both of the spaces. Hereinafter, the motor and the electric blower according to the fifth embodiment will be described focusing on differences from the third embodiment by taking as an example the case where the configuration of the third embodiment is based.

In the electric motor and the electric blower according to Embodiment 5 of the present invention, as shown in FIGS. 10 and 12, rubber 720 is provided between cylindrical member 600 and first bearing 400. The rubber 720 is, for example, silicone rubber having an annular shape. Also, a spring 710 is provided between the cylindrical member 600 and the second bearing 500. The spring 710 is a push spring having an annular shape. The spring 710 is specifically, for example, a spring washer.

As shown in FIG. 11, in the fifth embodiment, the convex portions 630 are respectively formed on surfaces corresponding to two cylindrical bottom surfaces of the cylindrical member 600. The convex portion 630 is disposed closer to the inner periphery in these planes. Therefore, the outer peripheral side far from the through hole 610 of these surfaces is recessed relative to the convex portion 630.

As shown in FIG. 10, the spring 710 is inserted between the cylindrical member 600 and the second bearing 500 in an elastically deformed state. Therefore, the spring 710 presses the second outer ring 510 in the axial direction to the opposite side to the first bearing 400. In other words, the cylindrical member 600 presses the second outer ring 510 in the axial direction opposite to the first bearing 400 via the spring 710. At this time, the convex portion 630 is disposed inside the annular shape of the spring 710. For this reason, it can suppress that the position of the spring 710 shifts | deviates. The spring 710 may be another elastic body, specifically, for example, rubber or the like.

The rubber 720 is inserted between the cylindrical member 600 and the first bearing 400 in an elastically deformed state. Therefore, the rubber 720 presses the first outer ring 410 in the direction opposite to the second bearing 500 along the axial direction. In other words, the cylindrical member 600 presses the first outer ring 410 to the side opposite to the second bearing 500 along the axial direction via the rubber 720. At this time, the convex portion 630 is disposed inside the annular shape of the rubber 720. For this reason, it can suppress that the position of rubber | gum 720 shifts | deviates. The rubber 720 may be another elastic body, specifically, for example, a pressing spring or the like.
The other configuration is the same as that of the third embodiment, and the description thereof is omitted here.

Also in the electric motor and the electric blower configured as described above, the same effect as any of the first to fourth embodiments can be obtained. In addition, the force by which the cylindrical member 600 presses the second outer ring 510 can be stabilized by the spring 710 which is an elastic member. Similarly, the force by which the cylindrical member 600 presses the first outer ring 410 can be stabilized by the rubber 720 which is an elastic member. Furthermore, the vibration due to the rotation of the rotor 330 transmitted from the first bearing 400 and the second bearing 500 to the housing 311 can be suppressed, and the vibration of the outer component of the motor can be reduced.

Specifically, the electric blower according to Embodiment 1 to Embodiment 5 described above can be used for an electric device such as a vacuum cleaner or a dryer.

DESCRIPTION OF SYMBOLS 100 electric blower 200 blower part 210 fan 220 fan cover 221 suction port 230 guide blade 300 motor part 310 frame 311 housing 312 housing bottom part 313 housing bottom part 320 bracket 330 rotor 331 rotor core 332 shaft 340 stator 400 1st bearing 410 1st outer ring 420 first inner ring 430 first rolling element 500 second bearing 510 second outer ring 520 second inner ring 530 second rolling element 600 cylindrical member 610 through hole 620 concave portion 630 convex portion 710 spring 720 rubber

Claims

First and second bearings disposed in the housing and rotatably supporting the rotation shaft of the rotor;
A cylinder disposed between the first bearing and the second bearing in a state in which the rotation shaft is rotatably passed in a centrally formed through hole, and a cylinder fixed to the housing in the housing And an annular member,
The first bearing is
A first outer ring,
And a first inner ring fixed to the rotating shaft,
The second bearing is
A second outer ring,
And a second inner ring fixed to the rotation shaft,
The cylindrical member presses the first outer ring along the axial direction parallel to the rotation axis toward the opposite side to the second bearing, and the second outer ring along the axial direction. And an electric motor for pressing toward the opposite side to the first bearing.
The motor according to claim 1, wherein the cylindrical member is crimped from the outside of the housing and fixed in the housing.
A recess is formed on the outer surface of the cylindrical member,
The motor according to claim 2, wherein the cylindrical member is crimped at the position of the recess.
The motor according to claim 3, wherein the recess is disposed at the axial center of the cylindrical member.
The cylindrical member is formed on one or both surfaces of the first bearing side and the second bearing side, and has a convex portion that abuts on the first outer ring or the second outer ring. A motor according to any one of the preceding claims.
The elastic member provided in one or both of between the said 1st outer ring | wheel and the said cylindrical member and between the said 2nd outer ring | wheel and the said cylindrical member further provided with the any one of the Claims 1-5 A motor according to any one of the preceding claims.
The motor according to claim 6, wherein the elastic member is rubber.
The motor according to claim 6, wherein the elastic member is a push spring.
The second bearing is disposed closer to the rotor core of the rotor than the first bearing.
The electric motor according to any one of claims 1 to 8, wherein a surface of the first outer ring opposite to the cylindrical member is pressed against a bottom of the housing.
10. The electric motor according to claim 9, further comprising an elastic member provided between the surface of the first outer ring opposite to the cylindrical member and the bottom of the housing.
The inner diameter of the cylindrical member is larger than the outer diameter of the rotating shaft,
The outer diameter of the cylindrical member is smaller than the outer diameter of the first bearing and the second bearing,
The difference between the inner diameter of the cylindrical member and the outer diameter of the rotary shaft is larger than the difference between the outer diameter of the cylindrical member and the outer diameters of the first bearing and the second bearing. The electric motor according to any one of claims 10.
The electric motor according to any one of claims 1 to 11, wherein the cylindrical member has a thermal expansion coefficient equivalent to that of the housing.
An electric motor according to any one of claims 1 to 12;
And a fan fixed to the rotating shaft.