KR20180028731A - Bearing and Motor having the same - Google Patents

Abstract

According to an embodiment, a roll bearing comprises: an inner ring fixated to a rotating shaft; an outer ring spaced from the inner ring; a roll member arranged between the inner ring and the outer ring; and elastic mesh surrounding the outer circumferential surface of the outer ring, and provided with a plurality of through holes in the radial direction. Therefore, the center of a shaft can be easily varied, and heat can be quickly radiated.

Description

[0001] Bearing and Motor Having the Same [

Field of the Invention [0002] The present invention relates to a rolling bearing and a motor having the same, and more particularly to a rolling bearing having a rolling member and a motor having the rolling bearing.

A bearing is a mechanical element that fixes a rotating shaft in a fixed position and rotates the shaft while supporting the shaft.

Bearings can be divided into sliding bearings and rolling bearings according to the contact state, and air bearings that support high-pressure air between the rotary shaft and the bearing to support the shaft by pneumatic pressure.

The rolling bearing is characterized in that a rolling member such as a ball, a roller, or a needle rotates together with the inner ring to support the rotating shaft. The rolling bearing has a small frictional resistance, and particularly a high reliability at high speed rotation. Such rolling bearings are used in motors such as motors and compressors, generators, and transmissions in which the rotating shaft needs to be rotated at a high speed.

When the rolling bearing is mounted on the motor, the rolling bearing can be supported by a motor body forming the outer surface of the motor, or supported by a bracket installed separately on the motor body, and the load of the rotating shaft is transmitted to the motor body or bracket through the rolling bearing .

As described above, the motor equipped with the rolling bearing can be composed of an assembly of a plurality of parts, and the assembly tolerance thereof can exist. The rolling bearing provided in the motor can be twisted due to such an assembly tolerance. In this case, the amount of wear of the rolling bearing is large and the life of the rolling bearing is shortened.

JP 2011 185144 A (Released on September 2, 2011) KR 10-1633673 B1 (Notice of June 27, 2016)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rolling bearing and a motor having the rolling bearing in which the shaft center can be easily changed and the heat of the outer ring can be released more quickly.

A rolling bearing according to an embodiment of the present invention includes: an inner ring fixed to a rotating shaft; Inner ring and spaced outer ring; A rolling member disposed between the inner and outer rings; And an elastic mesh surrounding the outer circumferential surface of the outer ring and having a plurality of through holes in the radial direction. According to this, the elastic mesh having a plurality of through holes can be easily elastically deformed by the outer ring so that the axial center can be easily changed, and the heat of the outer ring and the elastic mesh can be dissipated more quickly while air passes through the plurality of through holes .

A motor having a rolling bearing according to an embodiment of the present invention includes a motor body; A bracket mounted on the motor body; At least one of the motor body and the bracket may include a rolling bearing housing portion for supporting the rolling bearing, and the resilient mesh is supported by the rolling bearing housing portion in contact with the rolling bearing housing portion .

The outer ring can be press-fitted into the inside of the elastic mesh, and the elastic mesh can be brought into close contact with the outer surface of the outer ring.

The elastic mesh may comprise a metal wire mesh in which at least one metal wire is irregularly clustered.

The rolling bearing may further include an inner holder disposed between the outer ring and the elastic mesh. The inner holder may have an inner surface contacting the outer circumference of the outer ring and an outer surface contacting the elastic mesh.

The elastic mesh may include a contact portion contacting the outer ring and a spacing portion spaced apart from the outer ring, and the contact portion and the spacing portion may be alternately disposed along the outer ring. The through hole may be formed in at least one of the contact portion and the spacing portion. Then, the separating portion can be brought into contact with the rolling bearing housing portion.

The elastic mesh may have a shape in which the mesh portion formed with the through holes is dried at least twice.

The elastic mesh may include an inner mesh portion located at the innermost position in the radial direction and contacting the outer peripheral surface of the outer ring, and an outer mesh portion located radially outermost. The through hole may be formed in each of the inner mesh portion and the outer mesh portion. The outer mesh portion may be in contact with the rolling bearing housing portion.

The outer diameter of the outer ring may be smaller than the inner diameter of the rolling bearing housing part. The elastic mesh may be disposed between the outer surface of the outer ring and the inner surface of the rolling bearing housing portion.

The through hole can face the outer surface of the outer ring and the inner surface of the rolling bearing housing portion, respectively.

The thickness of the elastic mesh may be equal to or less than the gap between the outer circumferential surface of the outer ring and the inner circumferential surface of the rolling bearing housing portion. The elastic mesh can be press-fitted between the outer circumferential surface of the outer ring and the inner circumferential surface of the rolling bearing housing portion.

According to the embodiment of the present invention, the elastic mesh can be easily elastically deformed by a plurality of through holes to change the center of the shaft, and the heat of the outer ring and the elastic mesh can be dissipated more quickly while the air passes through the plurality of through holes .

Further, the outer ring and the elastic mesh can be fixed without a separate fixing structure, and the structure is simple.

In addition, air can be introduced into the elastic mesh through a plurality of through holes, and the outer ring can be dissipated more quickly around the outer ring.

In addition, there is an advantage that air passing through a plurality of through holes can be brought into contact with the outer ring and the rolling bearing housing portion, respectively, and both the outer ring and the elastic mesh and the rolling bearing housing portion can be cooled together.

1 is a perspective view showing a rolling bearing according to a first embodiment of the present invention,
2 is a sectional view showing a rolling bearing according to a first embodiment of the present invention,
3 is a cross-sectional view when the elastic mesh shown in Fig. 2 is elastically deformed, Fig.
4 is an exploded perspective view showing a motor having a rolling bearing according to the first embodiment of the present invention,
5 is a sectional view showing a motor having a rolling bearing according to the first embodiment of the present invention,
6 is a perspective view showing a rolling bearing according to a second embodiment of the present invention,
Fig. 7 is a cross-sectional view of the elastic mesh shown in Fig. 6 when it is elastically deformed,
8 is a perspective view showing a rolling bearing according to a third embodiment of the present invention,
9 is a cross-sectional view when the elastic mesh shown in Fig. 8 is elastically deformed.
10 is a cross-sectional view of the elastic mesh according to the fourth embodiment of the present invention when the elastic mesh is elastically deformed.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

1 is a perspective view showing a rolling bearing according to a first embodiment of the present invention, FIG. 2 is a sectional view showing a rolling bearing according to a first embodiment of the present invention, FIG. 3 is a cross- Is a transverse cross-sectional view when it is elastically deformed.

The rolling bearing 5 of this embodiment includes an inner ring 51 fixed to the rotary shaft 3; An outer ring 52 spaced apart from the inner ring 51; A rolling member 53 disposed between the inner ring 51 and the outer ring 52; And an elastic mesh 54 surrounding the outer circumferential surface of the outer ring 52 and having a plurality of through holes H formed therein.

The rolling bearing 5 can be mounted on a motor having a rotating shaft, such as a motor or a compressor, and can support the rotating shaft 3 in a rotatable manner. This electric motor can include a rolling bearing housing portion 81 surrounding the rolling bearing 5 and the rolling bearing 5 can support the rotating shaft 3 while being accommodated in the rolling bearing housing portion 81 . The rolling bearing housing part 81 may be formed in a hollow cylindrical shape.

The rolling bearing 5 may be one of a roller bearing, a ball bearing and a needle bearing. In the case of a motor for a vacuum cleaner in which a motor equipped with a rolling bearing 5 is used in a vacuum cleaner to suck air, it is preferable that the rolling bearing 5 be composed of a high-performance ball bearing for high-speed rotation.

The elastic mesh 54 can be mounted between the outer ring 52 and the rolling bearing housing part 81 so as to surround the outer ring 52. The elastic mesh 54 can be protected by the rolling bearing housing portion 81 and the outer ring 52 between the rolling bearing housing portion 81 and the outer ring 52.

A receiving space S1 in which at least a part of the elastic mesh 54 can be positioned may be formed between the outer ring 52 and the rolling bearing housing part 81. [ The outer diameter D1 of the outer ring 52 is smaller than the inner diameter D2 of the rolling bearing housing portion 81 and the receiving space S1 is formed in a hollow cylindrical shape between the outer ring 52 and the rolling bearing housing portion 81 .

The rolling bearing 5 can be accommodated in the rolling bearing housing portion 81 formed in the electric motor such as a motor or a compressor in a state where the inner ring 51, the outer ring 52 and the rolling member 53 are engaged, The elastic mesh 54 can be inserted and mounted between the outer ring 52 and the rolling bearing housing portion 81.

The rolling bearing 5 may be inserted into the rolling bearing housing part 81 in a state where the inner ring 51, the outer ring 52, the rolling member 53 and the elastic mesh 54 are both engaged .

The elastic mesh 54 can be positioned between the outer ring 52 and the rolling bearing housing portion 81 when the rolling bearing 5 is mounted on the electric motor and the outer ring 52 and the rolling bearing housing portion 81 The outer ring 52 can be elastically deformed.

The elastic mesh 54 may have a hollow cylindrical shape. The elastic mesh 54 may have a cylindrical void space formed therein. A plurality of through holes (H) may be formed radially and axially open to the elastic mesh (54).

The center axis of the rolling bearing 5 may be different from the center axis of the rolling bearing housing portion 81 due to the assembly tolerance of the electric motor. In this case, the elastic mesh 54 may be partially compressed by the outer ring 52 And the elastic mesh 54 can support the outer ring 52 so that the central axis B1 of the outer ring 52 is different from the central axis H1 of the rolling bearing housing portion 81. [

The elastic mesh 54 is preferably adhered to the outer ring 52 and the outer ring 52 can be press-fitted into the elastic mesh 54. The elastic mesh 54 is preferably in close contact with the rolling bearing housing part 81 and the elastic mesh 54 can be press-fitted into the rolling bearing housing part 81.

The inner diameter of the elastic mesh 54 may be equal to the outer diameter of the outer ring 52 or smaller than the outer diameter of the outer ring 52. The elastic mesh 54 can be extended to the outer diameter of the outer ring 52 while the outer diameter of the elastic ring 54 is extended to the inner diameter of the outer ring 52, have.

The elastic mesh 54 may have an outer diameter equal to the inner diameter of the rolling bearing housing portion 81 or smaller than the inner diameter of the rolling bearing housing portion 81. The elastic mesh 54 is inserted into the rolling bearing housing part 81 and its outer diameter can be reduced to be equal to the inner diameter of the rolling bearing housing part 81. The elastic mesh 54 is inserted into the rolling bearing housing part 81, And can be fixed to the rolling bearing housing portion 81. [

At least a part of the elastic mesh 54 can be press-fitted between the outer ring 52 and the rolling bearing housing portion 81 and can be positioned between the rolling bearing housing portion 81 and the outer ring 52 in a press- have.

It is preferable that the elastic mesh 54 has a structure that is easily deformed elastically by the outer ring 52 and that the heat of the outer ring 52 is easily dissipated to the outside.

A plurality of through holes (H) can facilitate the elastic deformation of the elastic mesh (54). The plurality of through holes (H) can help the heat of the outer ring (52) to dissipate quickly in the radial direction of the elastic mesh (5).

A plurality of through holes (H) may be partially formed in the elastic mesh (54) to open radially. The plurality of through holes H may be formed such that the heat of the outer ring 52 is radiated in the axial direction of the elastic mesh 5. A plurality of through holes H may be formed so that a part of the through holes H are axially opened to the elastic mesh 54. In addition, the plurality of through holes H can include both the radially-opened through-holes, the axially-opened through-holes, and the radial and axial through-holes.

On the other hand, the height L1 of the elastic mesh 54 may be higher than the height L2 of the outer ring 52. A portion of the elastic mesh 54 may be positioned between the outer ring 52 and the rolling bearing housing portion 81 and the rest of the elastic mesh 54 may be located outside the accommodation space S1.

The plurality of through holes (H) may include at least one first through-hole facing the outer ring (52) and at least one second through-hole that does not face the outer ring (52).

The elastic mesh 54 may comprise a metal wire mesh in which at least one metal wire 55 is irregularly clustered. The metal wire 55 constituting the elastic mesh 54 may include an inner contact portion which contacts the outer ring 52. The metal wire 55 constituting the elastic mesh 54 may include an outer contact portion contacting the rolling bearing housing portion 81. [ And, the elastic mesh 54 may include a plurality of metal wires 55 that are mutually entangled, and the plurality of metal wires may include wire contacts that are in contact with each other.

The heat of the outer ring 52 can be transferred to the metal wire 55 and the heat transferred to the metal wire 55 can be transferred to the rolling bearing housing part 81 through the metal wire 55. [ The heat of the outer ring 52 can be transmitted to the air in the electric motor through the metal wire 55 and the through hole H. [

2, the elastic mesh 54 has an inner circumferential surface 56 facing the outer circumferential surface of the outer ring 52 and an outer circumferential surface 56 facing the inner circumferential surface of the rolling bearing housing portion 81, (57). 3, the elastic mesh 54 may include both the outer ring 52 and the end portion 58 that does not face the rolling bearing housing portion 81. As shown in Fig. The through holes H may be formed in the inner circumferential surface 56, the outer circumferential surface 57 and the end portions 58 of the elastic mesh 54, respectively.

The end 58 of the elastic mesh 54 may be located outside the receiving space S1 and the air outside the receiving space S1 may pass through the through holes formed in the end 58 of the resilient mesh 54, 54).

That is, the air around the rolling bearing 5 can be introduced into the elastic mesh 54 through the through hole of the end portion 57, which does not face the outer ring 52 and the rolling bearing housing portion 81, Can pass between the outer ring 52 and the rolling bearing housing part 81 while passing through the through hole H of the elastic mesh 54. The outer ring 52, the elastic mesh 54, the rolling bearing housing part 81 May be transferred to the air introduced into the through hole (H) of the elastic mesh (54) to be radiated.

The rolling bearing 5 of the present embodiment can easily align its shaft center by a plurality of through holes H and at the same time can dissipate the heat of the outer ring 52 more quickly and efficiently.

FIG. 4 is an exploded perspective view showing a motor having a rolling bearing according to a first embodiment of the present invention, and FIG. 5 is a sectional view showing a motor having a rolling bearing according to the first embodiment of the present invention.

A motor M (hereinafter referred to as a motor) having a rolling bearing of this embodiment includes a motor body 1, at least one rolling bearing 5 for supporting the rotating shaft 3; And a bracket 8 provided in the motor body 1. [

At least one of the motor body 1 and the bracket 8 may include a rolling bearing housing portion 81 for supporting the rolling bearing 5.

The rolling bearing 5 may include an inner ring 51, an outer ring 52, a rolling member 53 and an elastic mesh 54, as shown in Figs. 1 to 3, And can be supported by the rolling bearing housing portion 81 in contact with the rolling bearing housing portion 81.

The motor M may include a stator 2 mounted on the motor body 1 and a rotor 4 mounted on the rotary shaft 3. [

The rotor 4 and the rolling bearing 5 can be mounted so as to be spaced apart from the rotating shaft 3 and the rotating shaft 3 and the rotor 4 and the rolling bearing 5 can constitute a rotating shaft assembly R .

The motor M may be configured to draw outside air to dissipate heat therein. The motor M may further include an impeller 71 connected to the rotary shaft 3 and a diffuser 74 for guiding the air flowed by the impeller 71.

The motor body 1 can form the appearance of the motor M. [ The motor body 1 may be provided with an air inlet 11 through which air outside the motor M is sucked into the interior of the motor body 1. A space for accommodating the stator 2, the rotor 3, the rotary shaft 3, the rolling bearing 5, the bracket 8, and the impeller 71 may be formed in the interior of the motor body 1. The motor body 1 may be provided with an air discharge port 12 through which the air inside the motor M is discharged to the outside of the motor body 1.

The motor body 1 can constitute a combined body of a plurality of members. The motor body 1 may include an impeller cover 13 having an air inlet 11 formed therein. The motor body 1 may further include a motor housing 14 having an air outlet 12 formed therein. The impeller cover 13 can be engaged with the motor housing 14 and the motor housing 14 can constitute the motor body 1 together with the impeller cover 13. [

The motor body 1 further includes a separate frame disposed between the impeller cover 13 and the motor housing 14 so that the impeller cover 13 and the motor housing 14 can be respectively coupled to the frame.

The motor M can also be such that a part of the bracket 8 is disposed between the impeller cover 13 and the motor housing 14 and the impeller cover 13 and the motor housing 14 are respectively coupled to the bracket 8 . In this case, the bracket 8 can constitute a part of the motor body 1.

The impeller cover 13 may surround the outer periphery of the impeller 71. The impeller cover 13 surrounds the outer periphery of the impeller 71 to protect the impeller 71.

The impeller cover 13 can be opened on the side facing the motor housing 14. [ The impeller cover 13 may be disposed to cover one open side of the motor housing 14. The impeller cover 13 may be coupled to or screwed to the motor housing 14 or the bracket 8 with a fastening member such as a screw.

The air intake port 11 may be formed smaller than the surface of the impeller cover 13 facing the motor housing 14. [

The inner circumferential surface of the impeller cover 13 can be spaced apart from the impeller 71 and the air that has flowed by the impeller 71 flows through the inner circumferential surface of the impeller cover 13 and the impeller 71 .

The motor housing 14 may be in the shape of a hollow cylinder whose one surface is open. The motor housing 14 may be provided with an air outlet 11 through which air is discharged to the outside. A plurality of air outlets 11 may be formed in the motor housing 14.

The stator 2 can be mounted on the motor body 1. [ The stator 2 may be mounted to the motor housing 14 and may be mounted around the outer periphery of the rotor 4 in the motor housing 14. [ The stator 2 can be mounted to the motor housing 14 with a fastening member such as a screw. The stator 2 may be formed in a hollow cylindrical shape. The stator 2 may be mounted so as to surround the outer periphery of the rotor 4. [

The stator 2 may be composed of a combination of a plurality of members. The stator 2 includes a stator core 21, a pair of insulators 22 and 23 coupled to the stator core 21 and a coil 24 disposed in the insulators 22 and 23 can do.

The rotating shaft 3 can be disposed long inside the impeller cover 13 inside the motor housing 14. [ The rotating shaft 3 may be partially disposed inside the motor housing 14 and the remainder may be positioned inside the impeller cover 13. [

The rotary shaft 3 is rotated together with the rotor 4 and can be supported by the rolling bearing 5 and can be rotatably disposed inside the motor body 1. [ The rotary shaft 3 can be rotated by the rotor 4 while being supported by the rolling bearing 5.

The impeller 71 can be connected to the rotary shaft 3 and the impeller 71 can be rotated inside the impeller cover 13 when the rotary shaft 3 rotates.

The rotating shaft 3 may be formed with an impeller connecting portion 32 to which the impeller 71 is connected. The impeller connecting portion 32 may be formed at a position spaced apart from the portion 31 surrounded by the rotor 4. The impeller connecting portion 32 may be formed at the end of the rotating shaft 3.

The rotary shaft 3 may be provided with a second bearing mounting portion to which a second bearing 6 described later is mounted.

The rotor 4 can be mounted so as to surround a part of the rotating shaft 3. The rotor 4 may be rotatably disposed inside the stator 2. [ The rotor 4 may be formed in a hollow cylindrical shape.

The rotor 4 includes an iron core 41 fixed to the rotary shaft 3, a magnet 42 provided on the iron core 41, a pair of end plates 43 and 44 for fixing the magnet 42, . ≪ / RTI >

The rotor 4 may be mounted so as to surround a part 31 between one end and the other end of the rotating shaft 3. The rotor 4 may be mounted between the impeller coupling portion 32 and the second bearing mounting portion.

The rolling bearing 5 can be accommodated in the rolling bearing housing portion 81 formed in at least one of the motor body 1 and the bracket 8 and supported in the rolling bearing housing portion 81, 3 can be rotatably supported.

The through hole (H) of the rolling bearing (5) can face the outer surface of the outer ring (52) and the inner surface of the rolling bearing housing portion (81), respectively.

The thickness of the elastic mesh 54 may be less than or equal to the gap between the outer circumferential surface of the outer ring 52 and the inner circumferential surface of the rolling bearing housing portion 81. The elastic mesh 54 can be press-fitted between the outer circumferential surface of the outer ring 52 and the inner circumferential surface of the rolling bearing housing portion 81.

One example of the motor M is provided with a rolling bearing housing portion 81 in which a rolling bearing 5 is accommodated in each of the motor body 1 and the bracket 8, A rolling bearing housing portion formed in the body 1 and a rolling bearing housing portion formed in the bracket 8, respectively. In this case, the rolling bearing housed in the rolling bearing housing portion 81 of the motor body 1 and the rolling bearing housed in the rolling bearing housing portion 81 of the bracket 8 are disposed apart from each other with the rotor 4 interposed therebetween And the load of the rotating shaft 3 can be distributed and acted on a pair of rolling bearings 5 spaced apart from each other with the rotor 4 interposed therebetween.

Another example of the motor M may be such that a part of the rotary shaft 3 located inside the motor housing 14 is directly supported by the motor housing 14. [ When the rotary shaft 3 is directly supported by the motor housing 14, the motor housing 14 may be provided with a rotary shaft support for rotatably supporting the rotary shaft 3. [ The rotary shaft support part may be formed to surround the outer circumference of the rotary shaft 3 in the motor housing 14. [ At least one of the rotary shaft 3 and the rotary shaft support may be provided with a lubricating medium such as lubricating oil for preventing wear between the rotary shaft 3 and the rotary shaft support.

Another example of the motor M is that a portion of the rotating shaft 3 located inside the motor housing 14 can be supported through a second bearing (not shown). In this case, the motor M may further include a second bearing (not shown) provided on the rotating shaft 3, and a second bearing (not shown) may rotatably support the rotating shaft 3. The second bearing includes an inner ring fixed to the rotary shaft (3); Inner ring and spaced outer ring; And a rolling member disposed between the inner and outer rings. When the motor M includes a second bearing supported by the motor housing 14, a second bearing support portion larger than the rotary shaft 3 may be formed on the motor housing 14. [ The outer ring of the second bearing may be in contact with the second bearing support and be supported by the second bearing support. The second bearing may be installed on the rotary shaft 3 so as to be spaced apart from the rolling bearing 5. The second bearing can be spaced apart from the rolling bearing 5 in the longitudinal direction of the rotating shaft 3. The rolling bearing 5 and the second bearing are capable of rotatably supporting the rotary shaft 3 at positions separated from each other. In this case, the rolling bearing 5 and the second bearing can be mounted apart from each other with the rotor 4 interposed therebetween, and the load of the rotating shaft 3 can be dispersed and acted on the rolling bearing 5 and the second bearing have.

In the following, a rolling bearing housing portion 81 in which the rolling bearing 5 is accommodated is provided in each of the motor body 1 and the bracket 8, and a pair of rolling bearings (5) rotatably supports the rotary shaft (3).

The O-ring 60 may be fixed to the rotary shaft 3 and the O-ring 60 may constitute a rotary shaft assembly (or a rotor assembly) together with the rotary shaft 3 and the rotor 4.

The O-ring 60 can be positioned between the rolling bearing 5 and the rotor 4 in the longitudinal direction of the rotary shaft 3 and can restrict the rolling bearing 5 from flowing toward the rotor 4 . The O-ring 60 can function as a bearing stopper for supporting the rolling bearing 5. [

The O-ring 60 can be fixed to the rotary shaft 3 so as to be in contact with a part of the rolling bearing 5. At least a part of the O-ring 60 can face the inner ring 51 of the rolling bearing 5. The O-ring 60 can be brought into contact with the inner ring 51 of the rolling bearing 5. The O-ring 60 may be a bearing stopper that restricts the inner ring 51 of the rolling bearing 5 from sliding toward the rotor 4. [

The outer diameter of the O-ring 60 may be smaller than the inner diameter of the elastic mesh 54. The O-ring 60 may be located inside the elastic mesh 54. The O-ring 60 can be rotated in an empty space formed inside the elastic mesh 54 when the rotary shaft 3 rotates.

It is preferable that a gap can be formed between the outer circumference of the O-ring 60 and the elastic mesh 54, and the O-ring 60 and the elastic mesh 54 are not in contact with each other. When the O-ring 60 and the elastic mesh 54 are in contact, at least one of the O-ring 60 and the elastic mesh 54 may be worn. On the other hand, if the O-ring 60 and the elastic mesh 54 are not in contact, the life of each of the O-ring 60 and the elastic mesh 54 can be maximized.

The O-ring 60 may be mounted on the rotary shaft 3 and be in contact with the inner ring 51 of the rolling bearing 5 and spaced from the elastic mesh 54.

The O-ring 60 may include an inner ring 61 in contact with the inner ring 51 and an outer ring 62 spaced apart from the outer ring 52 and the elastic mesh 54. The outer circumference of the outer ring 62 may be the outer circumference of the O-ring 60 and the outer diameter of the outer ring 62 may be the outer diameter of the O-

The impeller 71 can be rotated together with the rotary shaft 3 in a state of being connected to the rotary shaft 3. The impeller 71 may be positioned between the impeller cover 13 and a diffuser 74 described below.

The diffuser 74 may be mounted on at least one of the impeller cover 13 and the bracket 8.

The diffuser 74 includes a body 75 smaller in size than the impeller cover 13, a diffuser vane 76 protruding from the outer periphery of the body 75, And guide vanes 77 for guiding them.

The diffuser vanes 76 may be formed to convert the dynamic pressure of the air that has passed through the impeller 71 to a constant pressure.

The guide vane 77 may be formed to guide the pressurized air to at least one of the rolling bearing 5 and the rotor 4 by the diffuser vane 76.

The guide vane 77 can guide the air between the rolling bearing 5 and the rotor 4 and the air that has flowed by the guide vane 77 partially flows through the elastic mesh 54 of the rolling bearing 5 So that the outer ring 52, the elastic mesh 54, and the bracket 8 can radiate heat.

The rolling bearing housing part 81 formed in the motor body 1 may be formed in the motor housing 14. [ The rolling bearing housing part 81 may be formed to protrude toward the rotor 4 in a portion of the motor housing 14 facing the rotor 4. The motor housing 14 may further include a cover portion 82 covering between the inner ring 51 and the outer ring 52 of the rolling bearing 5 and the rolling bearing housing portion 81 of the motor housing 14, Can be protruded from the cover portion (82) of the motor housing (14).

The bracket 8 may be mounted on at least one of the motor housing 14 and the impeller cover 13. [ The rolling bearing housing part 81 formed in the bracket 8 can be formed at the center of the bracket 8.

The bracket 8 may further include a cover portion 82 covering between the inner ring 51 and the outer ring 52 of the rolling bearing 5. [ The cover portion 82 formed on the bracket 8 may be formed in a shape that is bent in the rolling bearing housing portion 81. The cover portion 82 may be formed in an annular shape at one end of the rolling bearing housing portion 81 and a rotation shaft through hole 83 through which the rotation shaft 3 can be rotatably inserted is formed in the cover portion 82 . The diameter of the rotating shaft through hole 83 may be smaller than the inner diameter of the rolling bearing housing part 81.

The cover portion 82 formed on the bracket 8 can be spaced apart from the O-ring 60 and the surface of the O-ring 60 facing the rolling bearing 5 and the surface of the cover portion 82 facing the rolling bearing 5 A bearing accommodation space in which the rolling bearing 5 is accommodated may be formed between the viewing surfaces.

The bracket 8 may include a fastening portion 84 that is fastened to at least one of the motor housing 14 and the impeller cover 13. The fastening portion 84 may be formed in an annular shape. The fastening portion 84 may be fastened to at least one of the motor housing 14 and the impeller cover 13 with a fastening member 85 such as a screw. The fastening portion 84 can be formed larger than the rolling bearing housing portion 81. The bracket 8 may include at least one connecting portion 86 connecting the coupling portion 84 and the rolling bearing housing portion 81.

It is preferable that the pair of rolling bearings 5 of this embodiment are mounted so that their central axes are coincident with each other, and when the central axes thereof do not coincide, wear of either one of them may be large.

The motor M is supported by the center shaft of the rolling bearing housing portion 81 formed on the bracket 8 and the rolling bearing housing portion 81 formed on the motor housing 14 by the assembly tolerance of the motor housing 14 and the bracket 8 May not coincide with each other.

The rolling bearing 5 of the present embodiment is designed so that even if the central axis of the rolling bearing housing portion 81 formed on the bracket 8 and the central axis of the rolling bearing housing portion 81 formed on the motor housing 14 do not coincide with each other, The meshes 54 are elastically deformed by the outer ring 52, so that the center axes of the pair of rolling bearings 5 can coincide with each other.

The center axis of the rolling bearing housing portion 81 formed on the bracket 8 and the center axis of the rolling bearing housing portion 81 formed on the motor housing 14 are moved in the left and right directions May not coincide with each other,

In this case, any one of the pair of rolling bearings 5 can be positioned to be laterally biased in the rolling bearing housing portion 81 formed in the bracket 8, and the other one of the pair of rolling bearings 5 One outer ring can be positioned to be rightwardly biased in the rolling bearing housing portion 81 formed in the bracket 8 and the central axes of the pair of rolling bearings 5 can be matched with each other.

Hereinafter, the heat dissipation of the rolling bearing according to the present embodiment will be described in detail.

The motor M can be rotated by the impeller 71 when the rotary shaft 3 rotates and the air can be sucked by the impeller 71 through the air inlet 11.

The air sucked by the impeller 71 can be flowed to the diffuser 74 by the impeller 71 and the air that has flowed to the diffuser 74 is guided sequentially by the diffuser vane 76 and the guide vane 77 .

A part of the air guided by the guide vane 77 can be introduced into the through hole H formed in the elastic mesh 54 around the rolling bearing 5.

Air is introduced into the elastic mesh 54 through the through holes formed in the end portion 58 of the elastic mesh 54 and at least part of the air is introduced into the elastic mesh 54. [ May be guided by the outer ring 52 of the rolling bearing 5 and the rolling bearing housing portion 81 and may be introduced into the gap between the rolling bearing housing portion 81 and the outer ring 52 of the rolling bearing 5. Such air can absorb the heat of the outer ring 52 of the rolling bearing 5, the elastic mesh 54, and the rolling bearing housing portion 81, respectively.

FIG. 6 is a perspective view showing a rolling bearing according to a second embodiment of the present invention, and FIG. 7 is a cross-sectional view when the elastic mesh shown in FIG. 6 is elastically deformed.

The present embodiment may further include an inner holder 100 disposed between the outer ring 52 and the elastic mesh 54. Other configurations and actions of the inner holder 100 are the same as those of the first embodiment of the present invention The same reference numerals are used, and a detailed description thereof will be omitted.

The inner holder 100 may have an inner surface 101 that is in contact with the outer circumference of the outer ring 52 and an outer surface 102 that is in contact with the elastic mesh 54. The inner surface 101 of the inner holder 100 may be an outer ring contact surface contacting the outer ring 52 and the outer surface of the inner holder 100 may be an elastic mesh contact surface contacting the elastic mesh 54. [

The outer diameter D3 of the inner holder 100 may be larger than the outer diameter D1 of the outer ring 52 and smaller than the inner diameter D2 of the rolling bearing housing portion 81. [ The receiving space S1 may be formed between the outer surface of the inner holder 100 and the inner surface of the rolling bearing housing part 81 and at least a part of the elastic mesh 54 may be formed on the outer surface of the inner holder 100 And the inner surface of the rolling bearing housing part 81, as shown in Fig.

One example of the inner holder 100 may be formed in a hollow cylindrical shape to surround the entire outer circumference of the outer ring 52. In the inner holder 100, the rectangular plate-shaped plate is pushed down into a substantially hollow cylindrical shape, and one end and the other end thereof can be attached by welding, adhesive or the like.

Another example of the inner holder 100 may be formed in an arc shape to surround a part of the outer circumference of the outer ring 62. In this case, the inner holder 100 can be formed with a radially open gap. It is needless to say that the inner holder 100 is formed in such a manner that the rectangular band-shaped plate is dried in a circular arc shape and a gap is formed between one end and the other end.

The inner holder 100 can be positioned inside the elastic mesh 54 and can protect the outer ring 52 between the outer ring 52 and the elastic mesh 54. [ The inner holder 100 can prevent the metal wire 55 of the elastic mesh 54 from contacting the outer circumferential surface of the outer ring 52 and minimize the damage of the outer ring 52 by the metal wire 55 .

The inner holder 100 may be formed of a material having high heat transfer performance so that the heat of the outer ring is transmitted to the elastic mesh 54, or may be formed of a metal material.

It is preferable that the inner holder 100 protects the outer ring 52 without being damaged by the elastic mesh 54. [ It is needless to say that a coating layer such as Teflon coating may be additionally formed on the outer circumferential surface of the inner holder 100 in order to minimize the damage of the inner holder 100 by the elastic mesh 54.

The inner holder 100 may be fixed to the elastic mesh 54 so as not to hang together with the outer ring 52 in the elastic mesh 54. [ The inner holder 100 may be formed with an elastic mesh fitting groove into which a part of the elastic mesh 54 is inserted.

The inner holder 100 can be displaced together with the outer ring 52 in the interior of the elastic mesh 54. [ When the outer ring 52 is eccentrically moved from the inside of the metal mesh 54 to one side, the inner holder 100 can be displaced together with the outer ring 52 in a fixed state with the outer ring 52.

The outer ring 52 is inserted into the inner holder 100 and can be brought into close contact with the inner holder 100 and the inner holder 100 is inserted into the elastic mesh 54 to form the elastic mesh 54 As shown in Fig.

The rolling bearing 5 is mounted on the rolling bearing housing part 81 in a state where the inner ring 51, the rolling member 53 and the outer ring 52 are joined to the inner holder 100 and the elastic mesh 54 .

FIG. 8 is a perspective view showing a rolling bearing according to a third embodiment of the present invention, and FIG. 9 is a cross-sectional view when the elastic mesh shown in FIG. 8 is elastically deformed.

The rolling bearing of the present embodiment includes an elastic mesh 54 'formed in a staggered shape along the outer ring 52, and other structures and actions other than the elastic mesh 54' are the same as those of the first embodiment of the present invention, And a detailed description thereof will be omitted.

The zigzag-shaped resilient mesh 54 'may be formed of a metal having a high heat transfer performance, a plurality of metal wires may be irregularly coupled, or a plurality of metal wires may be arranged regularly such as a grid shape .

The elastic mesh 54 'of the present embodiment may include a contact portion 54A contacting the outer ring 52 and a spacing portion 54B spaced apart from the outer ring 54A. The contact portion 54A and the spacing portion 54B may be formed of protrusions and depressions alternately arranged along the periphery of the outer ring 52.

The innermost portion of the contact portion 54A can be brought into contact with the outer circumferential surface of the outer ring 52. [ The outermost portion of the spacing portion 54B can be brought into contact with the inner circumferential surface of the rolling bearing housing portion 81. [

The contact portion 54A and the spacing portion 54B can be alternately disposed along the outer ring 52. [ The elastic mesh 54 'is formed in a hollow cylindrical shape as a whole, and the contact portion 54A and the spacing portion 54B can be alternately formed in the circumferential direction.

The elastic mesh 54 'of the present embodiment may have a through hole H formed in each of the contact portion 54A and the spacing portion 54B.

The receiving space S1 between the outer ring 52 and the rolling bearing housing part 81 is formed by the inner air passage S2 between the inner surface of the elastic mesh 54 'and the outer ring 52, And an outer air passage (S3) between the outer surface and the rolling bearing housing portion (81).

Each of the inner air passage S2 and the outer air passage S3 may be elongated in the axial direction. The receiving space S1 between the outer ring 52 and the rolling bearing housing part 81 is formed such that the inner air passage S2 and the outer air passage S3 are alternately formed in the circumferential direction with the elastic mesh 54 ' .

The through hole H formed in the elastic mesh 54 'can communicate the inner air passage S2 with the outer air passage S3 and the air can move the inner air passage S2 and the outer air passage S3 The outer ring 52, the elastic mesh 54 'and the rolling bearing housing portion 81 can be cooled more quickly.

The air between the outer surface of the elastic mesh 54 'and the rolling bearing housing part 81 can be in contact with the outer ring 52 through the through hole H formed in the contact part 54A. The air between the outer ring 52 of the rolling bearing 5 and the inner surface of the elastic mesh 54 'passes through the through hole H formed in the spacing portion 54B to the inner peripheral surface of the rolling bearing housing portion 81 Can be contacted.

The elastic mesh 54 'of this embodiment has a hollow cylindrical shape in which the strip-shaped mesh portion formed with the concave-convex portion and the through-hole H in the longitudinal direction is joined to one end 54C and the other end 54D, Lt; / RTI >

10 is a cross-sectional view of the elastic mesh according to the fourth embodiment of the present invention when the elastic mesh is elastically deformed.

The rolling bearing of the present embodiment includes the mesh portion 54 "in which the through-hole H is formed at least twice, and the other components and actions in addition to the elastic mesh 54" The same reference numerals are used and a detailed description thereof will be omitted.

The elastic mesh 54 '' can be fabricated by winding the strip-shaped mesh portion many times in the form of a scroll. The strip-shaped mesh portion can be formed of a metal having high heat transfer performance, and a plurality of metal wires are irregularly coupled Or a plurality of metal wires may be arranged to be regularly arranged like a grid shape or the like.

The inner mesh portion 59A located at the innermost position in the radial direction of the elastic mesh 54 'can be brought into contact with the outer peripheral surface of the outer ring 52. The elastic mesh 54' The outer mesh portion 59B positioned on the outer circumferential surface of the rolling bearing housing portion 81 can be brought into contact with the rolling bearing housing portion 81. The through hole H may be formed in each of the inner mesh portion 59A and the outer mesh portion 59B.

The elastic mesh 54 '' may further include at least one center mesh portion 59C positioned between the inner mesh portion 59A and the outer mesh portion 59B. And the outer mesh portion 59B is wound around the center mesh portion 59C so that the center mesh portion 59C can be wound around the center mesh portion 59C.

The elastic mesh 54 "of the present embodiment can include the inner mesh portion 59A and the outer mesh portion 59B without the center mesh portion 59C. In this case, the outer mesh portion 59B includes the inner mesh portion 59A 59A.

In this embodiment, a hollow cylindrical elastic mesh 54 "can be manufactured as a whole by a simple process of winding a single strip-shaped mesh part many times in a scroll shape. There is an advantage that heat can be dissipated through the air passages S2, S3, and S4 between the mesh portions 59A, 59B, and 59C sequentially disposed in the radial direction.

An inner air passage S2 may be formed between the outer peripheral surface of the outer ring 52 and the inner mesh portion 59A. An outer air passage S3 may be formed between the inner circumferential surface of the rolling bearing housing portion 81 and the outer mesh portion 59B. A center air passage S4 may further be formed between the inner air passage S2 and the outer air passage S3.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

1: Motor body 5: Rolling bearing
8: Bracket 51: Inner ring
52: outer ring 53: rolling member
54: Elastic mesh H: Through hole

Claims (16)

An inner ring fixed to the rotary shaft;
An outer ring spaced from the inner ring;
A rolling member disposed between the inner and outer rings;
And an elastic mesh surrounding the outer circumferential surface of the outer ring and having a plurality of through holes in a radial direction. The method according to claim 1,
Wherein the outer ring is press-fitted into the elastic mesh, and the elastic mesh is in close contact with an outer surface of the outer ring. The method according to claim 1,
Wherein the resilient mesh comprises a metal wire mesh in which at least one metal wire is irregularly clustered. The method according to claim 1,
Further comprising an inner holder disposed between the outer ring and the elastic mesh,
The inner holder
An inner surface contacting the outer circumference of the outer ring,
And a rolling bearing having an outer surface to which the elastic mesh contacts. The method according to claim 1,
Wherein the elastic mesh has a contact portion that is in contact with the outer ring and a spacing portion that is spaced apart from the outer ring is alternately disposed along the outer ring,
Wherein the through hole is formed in at least one of the contact portion and the spacing portion. The method according to claim 1,
Wherein the elastic mesh has a shape in which the mesh portion in which the through hole is formed is at least twice dried. The method according to claim 6,
The elastic mesh
An inner mesh portion located at the innermost position in the radial direction and contacting the outer peripheral surface of the outer ring,
And an outer mesh portion located radially outermost,
And the through hole is formed in each of the inner mesh portion and the outer mesh portion. A motor body;
A bracket installed on the motor body;
At least one rolling bearing for supporting a rotating shaft,
Wherein at least one of the motor body and the bracket includes a rolling bearing housing portion for supporting the rolling bearing,
The rolling bearing
An inner ring fixed to the rotary shaft;
An outer ring spaced from the inner ring;
A rolling member disposed between the inner and outer rings;
And an elastic mesh surrounding the outer circumferential surface of the outer ring and having a plurality of through holes in the radial direction,
And the elastic mesh has a rolling bearing which is in contact with the rolling bearing housing part and is supported by the rolling bearing housing part. 9. The method of claim 8,
Wherein the outer ring is press-fitted into the elastic mesh, and the elastic mesh is in close contact with an outer surface of the outer ring. 9. The method of claim 8,
Wherein the resilient mesh comprises a metal wire mesh in which at least one metal wire is irregularly clustered. 9. The method of claim 8,
Wherein the elastic mesh has a contact portion that is in contact with the outer ring and a spacing portion that is spaced apart from the outer ring is alternately disposed along the outer ring,
Wherein the spacing portion is in contact with the rolling bearing housing portion,
Wherein the through hole is formed in at least one of the contact portion and the spacing portion. 9. The method of claim 8,
Wherein the elastic mesh has a shape in which the mesh portion in which the through hole is formed is at least twice dried. 13. The method of claim 12,
The elastic mesh
An inner mesh portion located at the innermost position in the radial direction and contacting the outer peripheral surface of the outer ring,
And an outer mesh portion located radially outermost and in contact with the rolling bearing housing portion,
And the through hole is formed in each of the inner mesh portion and the outer mesh portion. 9. The method of claim 8,
The outer diameter of the outer ring is smaller than the inner diameter of the rolling bearing housing part,
Wherein the elastic mesh has a rolling bearing disposed between an outer surface of the outer ring and an inner surface of the rolling bearing housing portion. 15. The method of claim 14,
And the through hole has a rolling bearing which faces the outer surface of the outer ring and the inner surface of the rolling bearing housing portion, respectively. 9. The method of claim 8,
The thickness of the elastic mesh is equal to or smaller than the gap between the outer circumferential surface of the outer ring and the inner circumferential surface of the rolling bearing housing portion,
Wherein the elastic mesh has a roller bearing press-fitted between an outer circumferential surface of the outer ring and an inner circumferential surface of the rolling bearing housing portion.

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