KR102186247B1 - Fan motor - Google Patents

Abstract

Provided is a bearing assembly which comprises: a shaft forming a rotating shaft; an air bearing and a rolling bearing supporting rotation of the shaft and respectively provided on both sides of the shaft; and an elastic member surrounding at least a portion of an outer circumferential surface of the air bearing and the rolling bearing, wherein the rolling bearing includes: a holder contacting the outer circumferential surface of the rolling bearing and having a predetermined thickness in a vertical direction of the rotating shaft; and a coupling groove formed on an outer circumferential surface of the holder and having the elastic member coupled thereto. The elastic member is coupled to the coupling groove of the holder to align the shaft. Moreover, the elastic member is also coupled to the rolling bearing provided in a fan motor for miniaturization and weight reduction, thereby providing an effect of more precise alignment between the bearings.

Description

Fan motor

The present invention relates to a fan motor in which a motor and a fan are integrally installed, and more particularly, to a structure of a bearing supporting a rotating shaft of a fan motor rotating at an ultra high speed.

The fan motor integrally comprises a motor providing rotational force and a fan rotating by the motor to generate airflow. Fan motors are widely used in home appliances that require airflow, and a typical example is a vacuum cleaner.

The vacuum cleaner may be of a type provided with a main body installed with a fan motor and a suction duct equipped with a suction port. In addition, the vacuum cleaner may be of a handy type in which a fan motor is integrally installed on the suction duct side.

In particular, in the case of the handy type in which the fan motor is integrally installed on the suction duct side, there is a problem that the suction power of the vacuum cleaner is deteriorated due to low output.

Accordingly, attempts to increase the output of the fan motor while reducing the size and weight of the fan motor are continuing. Higher fan motor output means that high-speed rotation is absolutely necessary. High-speed rotation causes noise, vibration, and heat generation problems.

Consequently, it is necessary to design a bearing capable of supporting a rotating shaft rotating at high speed.

There may be several types of bearings that support a rotating shaft rotating at high speed, but rolling bearings and air bearings are typical examples.

Rolling bearings are bearings that reduce friction by placing a ball and a roller between the outer ring and the inner ring to make rotational contact. In addition, it is divided into ball bearings and roller bearings according to the type of rolling element.

Air bearings include a static pressure bearing that uses a static pressure given from the outside, and a dynamic pressure bearing that uses a hydrodynamic pressure caused by the viscosity of a gas caused by rotation of a shaft. Air bearings are advantageous for high-speed rotation in that rotation is made particularly slippery. In addition, it can be used at both high and low temperatures, so it is suitable for heat generation due to high speed rotation.

Supporting the rotating shaft rotating at high speed through some kind of bearing may be considered a design problem, but when the rotating shaft is supported by a plurality of bearings, the important point of bearing alignment is a common problem.

That is, when a plurality of bearings that may be provided spaced apart from each other are provided in the fan motor, it can be seen that it is important to support the rotating shaft by matching the centers between the bearings.

Accordingly, an object of the present invention is to provide a fan motor that stably supports a rotating shaft rotating at a high speed by more precisely matching the center of the bearings even when a plurality of bearings are provided spaced apart from each other.

In order to achieve the above object, the present invention supports the rotation of the shaft and the shaft including a rotation shaft, and includes an air bearing and a rolling bearing provided on both sides of the shaft, and at least a part of an outer peripheral surface of the air bearing and the rolling bearing. It includes an elastic member surrounding the rolling bearing, wherein the rolling bearing includes a holder having a predetermined thickness in a direction perpendicular to the rotational axis and in contact with the outer circumferential surface of the rolling bearing, and a coupling groove formed on the outer circumferential surface of the holder to which the elastic member is coupled, and , An elastic member is coupled to the coupling groove of the holder to provide a bearing assembly for aligning the shaft.

In addition, an embodiment of the present invention may provide an air bearing including a bush in contact with the outer circumferential surface of the air bearing and to which an elastic member is coupled, and an elastic member may be coupled to the bush to align the shaft.

In addition, an embodiment of the present invention may provide a bearing assembly in which the outer diameter of the bush is larger than the inner diameter of the holder and smaller than the outer diameter of the holder.

In addition, an embodiment of the present invention may provide a holder including a support, and the support may extend from the side of the holder along the longitudinal direction of the rotation shaft to contact the side of the air bearing to support the air bearing.

In addition, an embodiment of the present invention includes a shaft, an impeller rotatably coupled to the shaft, an air bearing located under the impeller and supporting the abduction of the shaft, and located under the air bearing, and rotatably coupled to the shaft. The rotor and the stator surrounding the outer side of the rotor, the rolling bearing located under the rotor and the stator and supporting the rotation of the shaft, the bracket forming the appearance of the air bearing and the rolling bearing, and the air bearing and the rolling bearing. A fan motor that includes an elastic member surrounding at least a portion of the rolling bearing, and has a coupling groove formed in a holder having a predetermined thickness in a vertical direction of the rotating shaft to align the shaft due to the coupling of the elastic member and the coupling groove. Can provide.

In addition, an embodiment of the present invention may further include a bush having a coupling groove to which an elastic member is coupled to an outer peripheral surface of the air bearing, and a fan motor that aligns the shaft by coupling the elastic member to the bush.

In addition, an embodiment of the present invention includes a first bracket forming the exterior of the air bearing and a second bracket forming the exterior of the rolling bearing, wherein the first bracket and the second bracket are provided at a predetermined distance, Step 1 is provided at the lower end of the inner circumferential surface of the bracket to support the axial movement of the air bearing, and a snap ring engaging groove is provided at the lower end of the inner circumferential surface of the second bracket. Supporting fan motors can be provided.

In addition, an embodiment of the present invention is provided with a protrusion extending toward the shaft at an upper end of the inner circumferential surface of the first bracket and an upper end of the inner circumferential surface of the second bracket to support the axial movement of the air bearing and the rolling bearing. A fan motor characterized by can be provided.

In addition, an embodiment of the present invention may provide a fan motor, wherein an outer diameter of the bush is larger than an inner diameter of the holder and smaller than an outer diameter of the holder.

In addition, an embodiment of the present invention may provide a fan motor in which an elastic member is an O-ring.

In addition, an embodiment of the present invention may provide a fan motor, characterized in that at least two coupling grooves provided on the outer surface of the bush are provided.

In addition, an embodiment of the present invention may provide a fan motor, characterized in that at least two coupling grooves provided on an outer surface of the holder are provided.

According to an embodiment of the present invention, it is possible to reduce the magnitude of vibration by providing a damping element to not only the air bearing but also the rolling bearing.

In addition, according to an embodiment of the present invention, since an O-ring may be used for both the air bearing and the rolling bearing, it may be easier to align the bearings.

In addition, according to an embodiment of the present invention, even in the case of a rolling bearing having a small size, it is possible to more easily use an O-ring.

In addition, according to an embodiment of the present invention, since the outer diameter of the holder may be larger than the inner diameter of the air bearing, there may be an advantage in terms of fabrication and assembly.

1 is a view showing a cross section of a fan motor,
FIG. 2 is an enlarged view of the air bearing in FIG. 1;
3 is an exploded perspective view of a fan motor;
4 is a view showing an air bearing to which a snap ring can be coupled;
5 is a view showing a snap ring,
6 is a view showing an exploded perspective view of a fan motor to which a snap ring can be coupled;
7 is a view showing a bearing assembly according to a preferred embodiment of the present invention,
8 is a view showing a bearing assembly according to another embodiment of the present invention.

Hereinafter, a conventional drawing for understanding the present invention capable of realizing the above object will be described with reference to the accompanying drawings and a preferred embodiment of the present invention.

In this process, the size or shape of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, terms specifically defined in consideration of the configuration and operation of the present invention may vary according to the intention or custom of users or operators.

Meanwhile, in the present invention, terms such as first and/or second may be used to describe various components, but the components are not limited to the terms. The terms are only for the purpose of distinguishing one component from other components, for example, within a range not departing from the scope of the rights according to the concept of the present invention, the first component may be referred to as the second component, Similarly, the second component may also be referred to as a first component.

Definitions of these terms should be made based on the contents throughout the present specification.

1 is a view showing a cross-section of a fan motor, and FIG. 2 is an enlarged view of the air bearing 60 shown in FIG. 1.

1 to 2, the fan motor 1 includes a shaft 10, an impeller 20, a rolling bearing 30, a rotor 40, a stator 50, and an air bearing 60. It may include.

The shaft 10 may rotate by receiving power by a rotor 40 and a stator 50 to be described later. Accordingly, the shaft 10 may form a rotation shaft, and the impeller 20 to be described later may be coupled to the shaft 10 to rotate together with the shaft 10.

The impeller 20 may include a hub 21 and a plurality of blades 23 formed to protrude outward from the outer circumference of the hub 21. The impeller 20 may be formed of a high-strength synthetic resin material, but is not limited thereto and may be made of a metal.

Since the impeller 20 is coupled to the shaft 10 and can rotate together, the plurality of blades 23 can also rotate around the shaft 10. Air may be introduced into the air inlet 71 by the rotation of the plurality of blades 23.

For example, air provided outside the fan motor 1 may be introduced into the fan motor 1 through the air inlet 71 by the rotation of the plurality of blades 23, and through this process, the fan motor 1 ) Can generate suction power in a vacuum cleaner equipped.

The rolling bearing 30 may rotatably support the shaft 10. The rolling bearing 30 may be provided in the rolling bearing bracket 31, and may include an inner ring, a rolling member, and an outer ring.

The rolling bearing 30 is shown to support one side that is the upper portion of the shaft 10 in FIG. 1, but is not limited thereto, and may support the other side of the shaft 10 so as to be rotatable. That is, the rolling bearing 30 may support the lower portion of the shaft 10.

The rotor 40 may include end caps 41 and 45 and a magnet 43. The end caps 41 and 45 may be provided at upper and lower portions of the magnet 43, respectively, and may serve to fix the magnet 43.

The magnet 43 can be rotated by the stator 50 to be described later, and is coupled to the shaft 10. As a result, rotation of the magnet 43 may cause rotation of the shaft 10. However, the present invention is not limited thereto, and the magnet 43 may not be provided in contact with the shaft 10 and may be coupled to the shaft 10 through a separate member. For example, the magnet 43 may be provided in the rotor core (not shown), and the rotor core (not shown) may be coupled to the shaft 10 to transmit power to the shaft 10.

The magnet 43 may be provided with a magnetic material, may be an electromagnet that forms a magnetic field only when a current flows, or may be a permanent magnet that forms a magnetic field without being supplied with current from the outside. When the magnet 43 is a permanent magnet, the magnet 43 may be a rare earth magnet, an Arnico magnet, or a ferrite magnet.

The stator 50 may include a stator core 51, an insulator 53, and a coil 55.

The stator core 51 may be provided outside the rotor 40. That is, along the circumference of the outer circumferential surface of the rotor 40, the outer circumferential surface and the predetermined distance may be provided.

The stator core 51 may form a magnetic path by the rotor 40 and may form the appearance of the stator 50. In addition, the insulator 53 may be coupled to the stator core 51. The coil 55 may be provided in the insulator 53 coupled to the stator core 51. Accordingly, even when current is applied to the coil 55, insulation between the coil 55 and the stator core 51 may be achieved by the insulator 53.

Eventually, a current is applied to the coil 55 so that the magnet 43 rotates, and the shaft 10 coupled with the magnet 43 rotates to transmit power.

The air bearing 60 may include a bush 61 and an air bearing bracket 63.

The bush 61 may be provided with the shaft 10 in the center and spaced apart from the outer peripheral surface by a predetermined distance along the outer peripheral surface of the shaft 10. In addition, the bush 61 may be provided with a plurality of coupling grooves 65, and the coupling groove 65 may be provided in a groove shape from the inner peripheral surface of the bush 61 toward the outer peripheral surface.

A fixing member 69 may be provided on the lower surface of the bush 61. The fixing member 69 may prevent the air bearing 60 including the bush from moving downward in the axial direction. In addition, the fixing member 69 may be provided with a stepped in a shape corresponding to the lower surface of the bush (61). On the other hand, the corresponding here may include a flat portion such as the shape of the bottom surface of the bush 61, and a shape that can contact a portion of the bottom surface of the bush 61 so that the bush 61 cannot move downward in the axial direction. Means.

The air bearing bracket 63 forms the exterior of the air bearing 60, and the air bearing 60 may be provided therein. The above-described fixing member 69 may be provided in contact with the lower surface of the air bearing bracket 63.

The inner circumferential surface of the air bearing bracket 63 may be provided at a predetermined distance from the bush 61. Therefore, when the elastic member 67 is coupled to the coupling groove 65 provided in the bush 61, the elastic member 67 may be provided in contact with the inner circumferential surface of the bush 61 and the air bearing bracket 63.

Further, the air bearing bracket 63 may have a stepped upper surface thereof. The stepped jaws may be provided to protrude toward the shaft 10 from the upper surface of the air bearing bracket 63. That is, as the stepped jaws are provided in the air bearing bracket 63, it is possible to prevent the air bearing 60 from moving upward in the axial direction.

However, the present invention is not limited thereto, and the air bearing 60 may also be provided on one side of the shaft 10 to rotatably support the shaft 10 like the rolling bearing 30 described above. That is, when the air bearing 60 is provided on the upper part of the shaft 10 to rotatably support the shaft 10, the rolling bearing 30 is provided at the lower part of the shaft 10 to rotate the shaft 10. I can support it as much as possible.

However, as shown in FIG. 1, when the inner diameter of the rolling bearing 30 is smaller than the inner diameter of the air bearing 60, the air bearing 60 from the other side (lower) of the shaft 10 It may be desirable to support (10) rotatably.

As a result, the rotor 40 may rotate by interaction with the stator 50. In addition, since the rotor 40 is coupled to the shaft 10, the rotation of the rotor 40 may cause the shaft 10 to rotate. Rotation of the shaft 10 can induce rotation of the impeller 20 coupled with the shaft 10, and the rotation of the impeller 20 allows air provided outside the fan motor 1 to flow through the air inlet 71. It can flow through.

The flow of air introduced from the outside through the air inlet 71 forms an air flow, and according to the formation of the air flow, the product incorporating the fan motor 1 may generate suction power.

Meanwhile, air introduced through the air inlet 71 may be discharged through the discharge port 73. In addition, RPM (Revolution per minute) of the impeller 20 may be sufficiently high to generate heat, which may eventually cause overheating of the rotor 40 and stator 50.

Accordingly, external air is introduced through the cooling air inlet 75 provided on the lower surface of the motor housing 80, and the external air introduced through the cooling air inlet 75 includes the rotor 40 and the stator 50. The composition can be cooled and discharged through the discharge port 73.

The reason that external air can be introduced through the cooling air inlet 75 is because the air provided around the impeller 20 according to Bernoulli's principle has a higher speed according to the rotation of the impeller 20 and thus has less pressure. to be.

Accordingly, the fan motor 1 may be driven as described above, and the above-described configurations surround the lower portion of the impeller housing 90 and the shaft 10 surrounding the upper portion of the shaft 10, and the rotor 40 and the stator ( It may be provided in the motor housing 80 provided to surround 50). In addition, the impeller housing 90 and the motor housing 80 may be provided integrally.

3 is an exploded perspective view of an embodiment of the fan motor 1.

Referring to FIG. 3, an air bearing bracket 63 may be provided on a lower surface of the motor housing 80. Specifically, the air bearing bracket 63 may be provided at a predetermined distance along the outer periphery of the lower surface of the motor housing, and a cooling air inlet 75 may be provided between spaces spaced at a predetermined distance. In other words, in order to form the cooling air inlet 75, a plurality of ribs radiating from the outer circumferential surface of the air bearing bracket 63 are connected to the periphery of the lower surface of the motor housing 80 with the air bearing bracket 63 as the center. It can be provided.

The air bearing bracket 63 may have an outer circumferential surface and an inner circumferential surface since there is a space for accommodating the air bearing 60 therein. Accordingly, the bush 61 to which the elastic member 67 is coupled is introduced into the air bearing bracket 63, and the fixing member 69 corresponding to the lower surface shape of the air bearing bracket 63 is formed of the air bearing bracket 63. It is coupled to the lower surface can prevent the axial movement of the air bearing (60).

However, the shape of the air bearing 60 is not limited thereto, and the shaft 10 may be rotatably supported in other shapes.

4 is a view showing another embodiment of the air bearing 60.

Except for the same configuration as the previous configuration, and referring to FIG. 4, the air bearing 60 rotates the shaft 10 without a separate fixing member 69 provided on the lower surface of the air bearing bracket 63 I can support it as much as possible.

A snap ring coupling groove 64 to which the snap ring 68 is coupled may be provided at a lower portion of the air bearing bracket 63. That is, the snap ring coupling groove 64 provided under the bush 61 may be provided by forming a groove from the inner peripheral surface of the air bearing bracket 63 toward the outer peripheral surface.

More specifically, refer to FIG. 5 to describe the form in which the snap ring 68 is coupled. 5(a) is a view showing a state in which the snap ring 68 is not subjected to pressure, and FIG. 5(b) is a view showing a state in which an external force acts on the snap ring 68.

The snap ring 68 may be made of an elastic material and may have a restoring force. Here, if there is a restoring force, if an external force is applied to the snap ring 68 from the outside, the shape of the snap ring 68 may be deformed while the external force is applied, but when the external force disappears, the snap ring 68 returns to the state before the external force was applied. It means to be able to go.

In other words, the snap ring 68 may have D1 as a radius before external force is applied, and may have D2 as a radius when external force is applied. D1 may be a value exceeding D2.

Referring again to Figs. 4 and 6, the coupling process of the snap ring 68 will be described. Fig. 6 is a fan having a configuration in which the snap ring 68 is combined instead of the fixing member to prevent the axial movement of the air bearing 60 It is an assembled perspective view of the motor 1.

A hole through which the snap ring 68 can flow may be provided under the air bearing bracket 63. The hole may be provided under the snap ring coupling groove 64. In addition, the radius H of the hole may be smaller than the radius D1 before the snap ring 68 receives an external force, and may be larger than the radius D2 after the snap ring 68 receives the external force.

Accordingly, the bush 61 to which the elastic member 67 is coupled into the air bearing bracket 63 is introduced through the hole and is in close contact with the upper inner circumferential surface of the air bearing bracket 63 to be fixed, and then the snap ring 68 may be coupled. .

More specifically, when an external force is applied to the snap ring 68 to form a radius (D2) to pass through the hole, and the radius (D1) is formed by removing the external force, the snap ring 68 is seated and provided in the snap ring coupling groove 64. Can be.

Accordingly, the shaft 10 may be rotatably supported by the rolling bearing 30 and the air bearing 60 described above. In addition, as described above, when the shaft 10 rotates at high speed, the elastic member 67 may be coupled to the air bearing 60 to reduce vibration and heat generation. In addition, as described above, the elastic member 67 may be in contact with the inner circumferential surface of the air bearing bracket 63 and the bush 61 at the same time to support the shaft 10 rotatably, which is the rolling bearing 30 and the air bearing ( 60) can have an easier effect to match the alignment.

However, as described above, the elastic member 67 may be coupled only to the air bearing 60. This is because in the case of the rolling bearing 30, the size of the rolling bearing 30 is small and it is difficult to provide a coupling groove to which the elastic member is coupled. More specifically, the outer ring of the rolling bearing 30 is difficult to process the coupling groove to which the elastic member is coupled.

Accordingly, the present invention provides a bearing assembly in which an elastic member can be coupled to not only the air bearing 60 but also the rolling bearing 30.

7 shows a cross section of a bearing assembly 100 according to a preferred embodiment of the present invention.

That is, the content shown in FIG. 7 may be a configuration corresponding to the rolling bearing 30 and the air bearing 60 in the previous description.

Referring to Figure 7, the bearing assembly 100 includes a shaft 110, a rolling bearing 120, a holder 130, a rolling bearing bracket 140, an air bearing bracket 150, and an air bearing ( 160) may be included.

The shaft 110 is provided through the air bearing bracket 150 and the rolling bearing bracket 120 and can rotate by receiving power from a rotor (not shown).

The rolling bearing 120 may include an inner ring 121, a rolling member 123 and an outer ring 125.

The inner ring 121 may constitute an inner side of the rolling bearing 120, and an outer circumferential surface of the inner ring 121 may be provided in combination with the shaft 110. That is, when the outer circumferential surface of the inner ring 121 is coupled to the shaft 110 and the shaft 110 rotates, it may rotate like the shaft 110.

The outer ring 125 may constitute the outside of the rolling bearing 120 and may be provided in close contact with the holder 130 to be described later. Since the outer ring 125 may be fixed and provided in contact with the holder 130, it may not rotate even when the shaft 110 rotates.

The rolling member 123 is provided in contact with the inner ring 121 and the outer ring 125, and may be provided between the inner ring 121 and the outer ring 125. That is, when the inner ring 121 rotates together with the rotation of the shaft 100, the rolling member 123 may perform a rolling or sliding motion between the inner ring 121 and the outer ring 125. For example, when the rolling member 123 is a ball, a rolling motion may be performed between the inner ring 121 and the outer ring 125.

Accordingly, the rolling bearing 120 may rotatably support the shaft 110.

The holder 130 may be provided in contact with the outer ring 125. In addition, the holder 130 may be provided to form a predetermined thickness in the radial direction of the rotation axis. In other words, the holder 130 may extend from the outer circumferential surface of the outer ring 125 toward the inner circumferential surface of the rolling bearing bracket 140 to be provided.

Holder 130 may be provided with an elastic member coupling groove 131 on the outer circumferential surface. The elastic member 133 may be coupled to the elastic member coupling groove 131, and the elastic member 133 may be coupled in contact with the inner peripheral surface 143 of the rolling bearing bracket 140 and the outer peripheral surface of the holder 130 at the same time. . In other words, the holder 130 may be provided with a predetermined distance from the rolling bearing bracket 140.

The holder 130 may include a stepped portion to which the outer ring 125 is coupled. The stepped portion may be provided to protrude toward the shaft 110 from the inner peripheral surface of the holder 130. Accordingly, the lower surface of the outer ring 125 may be prevented from moving in the axial direction by the stepped portion. That is, the lower surface of the outer ring 125 may be provided in contact with the upper surface of the stepped portion.

However, the stepped portion may be provided to partially contact not only the outer ring 125 but also the inner ring 121. That is, the stepped portion extends to contact the lower surface of the outer ring 125 and may partially contact the lower surface of the inner ring 121. Alternatively, it may be provided so as not to contact the lower surface of the inner ring 121 while being in contact with all the lower surfaces of the outer ring 125.

Alternatively, the holder 130 may be provided in contact with the outer ring 125 without a stepped portion. In this case, the outer ring 125 may be press-fitted to the inner circumferential surface of the holder 130 for fixing with the outer ring 125. That is, the outer circumferential surface of the outer ring 125 may be press-fitted to the inner circumferential surface of the holder 130.

A protrusion coupling groove 141 to which a protrusion 135 supporting the holder 130 is coupled may be provided under the rolling bearing bracket 140. The protrusion 135 may extend from the protrusion coupling groove 141 and may be provided in contact with the lower surface of the holder 130. Accordingly, the holder 130 may be prevented from moving in the axial direction by the protrusion 135.

Alternatively, a snap ring coupling groove 141 for supporting the holder 130 may be provided under the rolling bearing bracket 140. The snap ring 135 is coupled to the snap ring coupling groove 141 and may be provided in contact with the lower surface of the holder 130. Even in this case, the holder 130 may be prevented from moving in the axial direction by the snap ring 135.

As a result, the rolling bearing 120 may be provided while being fixed within the rolling bearing bracket 140 while supporting the shaft 110 in a rotatable manner.

The air bearing 160 may include a bush 161 to which the elastic member 163 is coupled. The elastic member 163 may be provided in contact with the outer circumferential surface of the bush 161 while contacting the inner circumferential surface of the air bearing bracket 150. In other words, the outer circumferential surface of the bush 161 may be provided at a predetermined distance from the inner circumferential surface of the air bearing bracket 150.

A snap ring coupling groove 153 to which the snap ring 155 is coupled may be provided on an upper portion of the air bearing bracket 150. That is, the snap ring 155 may extend from the snap ring coupling groove 153 and be provided in contact with the upper surface of the bush 161. Accordingly, the snap ring 155 may prevent the air bearing 160 from moving in the axial direction.

Further, the rolling bearing bracket 140 and the air bearing bracket 150 may each have a stepped step 151. As an example, a stepped step 151 may be provided on the upper portion of the rolling bearing bracket 140, and the stepped step 151 may be provided to protrude toward the shaft 110 from the inner circumferential surface of the rolling bearing bracket 140. In addition, a stepped jaw 151 may be provided below the air bearing bracket 150, and the stepped 151 may be provided to protrude toward the shaft 110 from the inner circumferential surface of the air bearing bracket 150. Accordingly, according to an example, the rolling bearing 120 and the air bearing 160 may be prevented from moving in the axial direction by the stepped jaw 151.

The elastic members 133 and 163 may be O-rings. The O-ring may have a ring shape in cross section. In addition, the O-ring may be a circular ring. The material of the O-ring may be synthetic rubber. However, the material is not limited to synthetic rubber, and may be made of a fluororesin depending on the application.

Consequently, the rolling bearing 120 and the air bearing 160 may be fixed and provided in the rolling bearing bracket 140 and the air bearing bracket 150.

However, the configuration of the present invention is not necessarily limited thereto, and for example, a fixing member (see FIG. 2) may be coupled in place of the snap rings 135 and 155, and the rolling bearing 120 and the air bearing It will be considered that the configuration for preventing the axial movement of 160 corresponds to the present invention.

Meanwhile, the rolling bearing 120 may be provided below the air bearing 160 in the axial direction. That is, in order to configure the fan motor, the impeller may be provided closer to the air bearing 160 than the rolling bearing 120. When the rolling bearing 120 is provided in the axial direction lower than the air bearing 160 in terms of manufacturability and assembly, the outer diameter of the holder 130 may be larger than the outer diameter of the rolling bearing 160. In addition, the outer diameter of the holder 130 may be provided larger than the outer diameter of the bush (161). In addition, the inner diameter of the holder 130 may be provided smaller than the inner diameter of the rolling bearing 160, and the inner diameter of the holder 130 may be provided smaller than the inner diameter of the bush 161.

Therefore, even if the size of the rolling bearing 120 is small, it is possible to align the rolling bearing 120 through the elastic member 133. In addition, the center degree between the rolling bearing 120 and the air bearing 160 may be more precisely aligned, and the alignment of the rolling bearing 120 and the air bearing 160 may be aligned.

Meanwhile, the inner diameter of the holder 130 may be the inner diameter of the stepped portion, and may be the inner diameter of the holder 130 excluding the stepped portion. In other words, the inner diameter of the stepped portion may be provided smaller than the inner diameter of the air bearing 160 and the bush 161.

Accordingly, the rolling bearing 120 may rotatably support the shaft 110 in the lower axial direction of the shaft 110. In addition, a rotor and a stator may be provided above the rolling bearing 120 in the axial direction. In addition, an air bearing 160 may be provided at an axial upper portion of the rotor and the stator, and an impeller may be coupled to an upper portion of the air bearing 160 in the axial direction.

However, the above-described case is a case in which the rolling bearing 120 and the air bearing 160 are provided in different brackets in the fan motor, and the rolling bearing and the air bearing may be simultaneously provided in one bracket.

8 is a view showing another preferred embodiment of the present invention.

If redundancy of description is omitted, the bearing assembly 200 may include a shaft 210, a rolling bearing 220, a holder 230, a support part 235, and a bracket 270.

The holder 230 is provided in contact with the outer ring of the rolling bearing 220, and the stepped portion of the holder 230 may be provided to support the outer ring of the rolling bearing 220 from a lower surface.

A snap ring coupling groove 273 to which the snap ring 235 is coupled may be provided under the bracket 270. Accordingly, the snap ring 235 may extend from the snap ring coupling groove 273 toward the shaft 210 to be provided in contact with the lower surface of the holder 230. That is, the snap ring 235 may prevent the holder 230 from moving in the axial direction.

The support part 235 may extend from at least a portion of the upper surface of the holder 230 to support the rolling bearing 260. That is, the support part 235 may be provided in contact with at least a portion of the lower surface of the bush 261.

The bracket 270 may include a cap portion 271 provided thereon. The cap portion 271 may be provided to extend and protrude toward the shaft 210 from the inner circumferential surface of the bracket 270. At least a portion of the upper surface of the air bearing 260 may be provided in contact with the lower surface of the cap portion 271.

That is, the rolling bearing 220 and the air bearing 260 included in the bearing assembly 200 may be fixed within the bracket 270 to rotatably support the shaft 210.

The present invention is not limited to the above-described embodiments, and as can be seen from the appended claims, modifications can be made by those of ordinary skill in the field to which the present invention belongs, and such modifications fall within the scope of the present invention. You will see it.

Bearing assembly: 100 Shaft: 110
Rolling bearing: 120 Inner ring: 121
Rolling member: 123 Outer ring: 125
Holder: 130 Elastic member coupling groove: 131
Elastic member: 133 Snap ring: 135
Rolling bearing bracket: 140 Snap ring coupling groove: 141
Rolling bearing bracket inner surface: 143 Air bearing bracket: 150
Stepped: 151 Snap ring coupling groove: 153
Snap ring: 155 Air bearing: 160
Bush: 161 Elastic member: 163
Bearing assembly: 200 Shaft: 210
Rolling bearing: 220 Holder: 230
Support: 235 Cap: 271

Claims (12)

A shaft forming a rotating shaft;
An air bearing and a rolling bearing respectively provided on both sides of the shaft to support rotation of the shaft; And
Includes; an elastic member surrounding at least a portion of the outer peripheral surface of the air bearing and the rolling bearing,
The rolling bearing,
A holder contacting the outer peripheral surface of the rolling bearing and having a predetermined thickness in a vertical direction of the rotation shaft; And
Includes; a coupling groove formed on the outer peripheral surface of the holder, the elastic member is coupled,
The air bearing,
Includes; a bush in contact with the outer circumferential surface of the air bearing and provided with a coupling groove to which the elastic member is coupled,
The outer diameter of the bush is formed larger than the inner diameter of the holder and smaller than the outer diameter of the holder,
A bearing assembly in which an elastic member is coupled to the coupling groove of the holder and the coupling groove of the bush to align the shaft. delete delete The method of claim 1,
The holder includes a support,
The bearing assembly, wherein the support part extends from a side surface of the holder along a longitudinal direction of the rotation shaft to contact a side surface of the air bearing to support the air bearing. A shaft forming a rotating shaft;
An impeller rotatably coupled to the shaft;
An air bearing located under the impeller and supporting rotation of the shaft;
A rotor positioned under the air bearing and rotatably coupled to the shaft;
A stator surrounding the outside of the rotor;
A rolling bearing positioned below the rotor and the stator and supporting rotation of the shaft; And
Includes; a bracket forming the outer appearance of the air bearing and the rolling bearing,
And an elastic member provided between the bracket and an outer circumferential surface of the air bearing and the rolling bearing, and surrounding at least a portion of the air bearing and the rolling bearing,
The rolling bearing,
A holder contacting the outer peripheral surface of the rolling bearing and having a predetermined thickness in a vertical direction of the rotation shaft; And
Includes; a coupling groove formed on the outer peripheral surface of the holder, the elastic member is coupled,
The air bearing,
Includes; a bush having a coupling groove to which the elastic member is coupled to the outer peripheral surface of the air bearing,
The outer diameter of the bush is formed larger than the inner diameter of the holder and smaller than the outer diameter of the holder,
An elastic member is coupled to the coupling groove of the holder and the coupling groove of the bush to align the shaft. delete The method of claim 5,
The bracket includes a first bracket forming an exterior of the air bearing and a second bracket forming an exterior of the rolling bearing,
The first bracket and the second bracket are provided with a predetermined distance apart,
A stepped step is provided at the lower end of the inner circumferential surface of the first bracket to support the axial movement of the air bearing, and a snap ring coupling groove is provided at the lower end of the inner circumferential surface of the second bracket, and a snap ring is coupled to the snap ring coupling groove to the rolling bearing Fan motor, characterized in that to support the axial movement of the. The method of claim 7,
A fan motor, wherein a protrusion extending toward the shaft is provided at an upper end of the inner circumferential surface of the first bracket and an upper end of the inner circumferential surface of the second bracket to support axial movement of the air bearing and the rolling bearing. delete The method of claim 5,
The fan motor, characterized in that the elastic member is an O-ring. The method of claim 10,
Fan motor, characterized in that at least two coupling grooves provided on the outer surface of the bush are provided. The method of claim 10,
Fan motor, characterized in that at least two coupling grooves provided on the outer surface of the holder are provided.

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