CN210033934U - Bearing and cooling fan - Google Patents

Abstract

The utility model provides a bearing and radiator fan, bearing include the first bearing section and the second bearing section that set gradually along the axial of bearing, and the junction of the outer wall of first bearing section and second bearing section has first step, and first step is used for making the bearing support on radiator fan's base. The utility model provides a bearing, through setting up first step on the bearing, the base supports first step, through the direct cooperation between first step and the base, has realized the direct assembly between base and the bearing, has reduced two parts of pipe and clamping ring in the copper, has saved the cost, and has reduced the complexity of product assembly process, has improved production efficiency.

Description

Bearing and cooling fan

Technical Field

The utility model relates to a radiator fan field more specifically relates to a bearing and radiator fan.

Background

As shown in fig. 1 to 4, an assembly manner between a rotating shaft 60 ', a bearing 10' and a base 20 'is that the rotating shaft 60' is located in the bearing 10 ', the bearing 10' is located in a copper-in-tube 30 ', a press ring 40' is located inside the copper-in-tube 30 'and is pressed on one side of the press ring 40' away from the base 20 ', so that the press ring 40' realizes axial limitation of the bearing 10 ', the copper-in-tube 30' is connected with the base 20 'in a matching manner, and the bearing 10' and the base 20 'are assembled through the copper-in-tube 30'.

Therefore, in the prior art, the bearing 10 'is positioned on the base 20' through the two parts, namely the copper-in-pipe 30 'and the pressure ring 40', and the introduction of the copper-in-pipe 30 'and the pressure ring 40' leads to a complicated structure, a complicated assembly process and high cost of the heat dissipation fan.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.

To this end, an aspect of the present invention is to provide a bearing.

Another aspect of the present invention is to provide a heat dissipation fan including the above bearing.

In order to achieve the above object, an aspect of the present invention provides a bearing, including: the bearing comprises a first bearing section and a second bearing section which are sequentially arranged along the axial direction of the bearing, wherein a first step is arranged at the joint of the outer wall surface of the first bearing section and the outer wall surface of the second bearing section, and the first step is used for supporting the bearing on a base of a cooling fan.

Additionally, the utility model discloses above-mentioned technical scheme provides a bearing still has following additional technical characteristics:

in the above technical solution, the outer diameter of the first bearing segment is smaller than the outer diameter of the second bearing segment to form the first step.

In any of the above technical solutions, the first step is an annular step arranged along the circumferential direction of the bearing.

In any of the above technical solutions, the bearing includes: the third bearing section is followed the axial of bearing, first bearing section the second bearing section with the third bearing section sets gradually, the third bearing section with the junction of second bearing section forms the second step, the second step is used for supporting radiator fan's stator structure.

In any of the above technical solutions, an outer diameter of the third bearing segment is smaller than an outer diameter of the second bearing segment to form the second step.

In any of the above technical solutions, the second step is an annular step arranged along the circumferential direction of the bearing.

In any of the above technical solutions, the bearing is a powder metallurgy oil bearing.

The utility model discloses technical scheme of second aspect provides a radiator fan, include: a housing defining an installation space, the housing including a base; and the bearing according to any one of the aspects of the first aspect, wherein the bearing is located in the installation space, and the first step of the bearing is supported on the base.

In any one of the above technical solutions, a mounting hole is defined in the base, and the first bearing segment is located in the mounting hole and is in interference fit with the mounting hole.

In any one of the above technical solutions, the periphery of the mounting hole is provided with a supporting protrusion protruding towards the first step, and the supporting protrusion abuts against the first step to support the first step.

In any one of the above technical solutions, the heat dissipation fan includes: and the printed circuit board is arranged on the base and sleeved outside the supporting bulges.

In any one of the above technical solutions, the heat dissipation fan includes: and the stator structure is sleeved on the outer side of the bearing and supported on the second step of the bearing.

In any of the above technical solutions, the stator structure is sleeved outside the third bearing section of the bearing, and is in interference fit with the third bearing section.

Compared with the prior art, the utility model discloses following profitable technological effect has: the utility model discloses a set up first step on the bearing, the base supports first step, through the direct cooperation between first step and the base, has realized the direct assembly between base and the bearing, has reduced two parts of pipe and clamping ring in the copper, has saved the cost, has improved the assembly precision between bearing and the base, and has reduced the complexity of product assembly process, has improved production efficiency.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a heat dissipation fan in the prior art;

FIG. 2 is a schematic view of the cooling fan shown in FIG. 1 from another perspective;

FIG. 3 is a schematic sectional view taken along line A-A in FIG. 2;

fig. 4 is an exploded view of the heat dissipation fan shown in fig. 1.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 4 is:

the bearing comprises a bearing 10 ', a base 20', a copper middle pipe 30 ', a pressure ring 40', a heat radiation fan 50 'and a rotating shaft 60'.

Fig. 5 is a schematic structural diagram of a first view angle of a heat dissipation fan according to an embodiment of the present invention;

FIG. 6 is a schematic cross-sectional view taken along line B-B of FIG. 5;

FIG. 7 is an enlarged schematic view of the portion C of FIG. 6;

FIG. 8 is a second perspective view of the heat dissipation fan shown in FIG. 5;

FIG. 9 is a third perspective view of the heat dissipation fan shown in FIG. 5;

FIG. 10 is a fourth perspective view of the heat dissipation fan shown in FIG. 5;

FIG. 11 is a first exploded view of the heat dissipation fan shown in FIG. 5;

fig. 12 is a second exploded view of the heat dissipation fan shown in fig. 5.

Wherein, the correspondence between the reference numbers and the component names in fig. 5 to 12 is:

100 heat radiation fan, 1 shell, 11 upper cover, 12 base, 121 installation hole, 122 supporting protrusion, 13 installation space, 2 rotor structure, 21 fan blade, 3 iron core, 31 first accommodation hole, 4 printed circuit board, 41 second accommodation hole, 5 bearing, 51 first bearing section, 52 second bearing section, 53 third bearing section, 54 shaft hole, 55 first step, 56 second step, 6 rotating shaft, 61 first end part, 62 second end part.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

A bearing and a heat dissipation fan according to some embodiments of the present invention will be described below with reference to fig. 5 to 12.

As shown in fig. 6 and 7, according to some embodiments of the present invention, there is provided a bearing 5, including: the heat radiation fan 100 comprises a first bearing section 51 and a second bearing section 52 which are sequentially arranged along the axial direction (such as the direction of an arrow M in fig. 7) of a bearing 5, wherein a first step 55 is arranged at the joint of the outer wall surface of the first bearing section 51 and the outer wall surface of the second bearing section 52, the housing 1 defines an installation space 13, the bearing 5 is positioned in the installation space 13, the housing 1 comprises a base 12, and the first step 55 is used for supporting the bearing 5 on the base 12 of the heat radiation fan 100.

The embodiment of the utility model provides a bearing 5, through set up first step 55 on bearing 5's outer wall, first step 55 cooperates with base 12, specifically base 12 supports first step 55, thereby can directly cooperate between bearing 5 and the base 12 to be connected, realize the assembly between bearing 5 and the base 12, need not to adopt two parts of pipe and clamping ring among the prior art, the cost of product has been reduced on the one hand, on the other hand, the assembly process of product has been simplified, the assembly efficiency of product has been improved, and the assembly precision between bearing 5 and the base 12 has been improved.

In some embodiments, as shown in fig. 11 and 12, the outer diameter of the first bearing segment 51 is smaller than the outer diameter of the second bearing segment 52 to form a first step 55.

The first step 55 is formed by setting the outer diameter of the first bearing section 51 to be smaller than the outer diameter of the second bearing section 52, namely, the first step 55 is formed by changing the sizes of all parts on the outer wall surface of the bearing, so that the first step 55 is convenient to form, and the processing difficulty of the bearing 5 is reduced.

As shown in fig. 7, a shaft hole 54 is provided in the bearing 5, the rotating shaft 6 is provided in the shaft hole 54 and is rotatable with respect to the shaft hole 54, and the shaft hole 54 penetrates the first bearing segment 51 and the second bearing segment 52. In most cases, the bearing 5 is cylindrical, that is, the cross section of the bearing 5 (i.e., the pattern obtained by cutting the bearing 5 in a plane perpendicular to the axial direction of the bearing 5) has an inner ring (i.e., the shaft hole 54) which is circular and an outer ring which is circular, and the first step 55 may be formed by setting the outer diameter of the first bearing section 51 to be smaller than the outer diameter of the second bearing section 52. It will be appreciated that for the case where the bearing 5 is non-cylindrical, for example, where the inner race (i.e., the shaft bore 54) of the bearing 5 is circular in cross-section and the outer race is polygonal, the formation of the first step 55 on the outer wall surface at the junction of the first bearing segment 51 and the second bearing segment 52 may be achieved by providing the first bearing segment 51 with a cross-sectional area smaller than the cross-sectional area of the second bearing segment 52 or the first bearing segment 51 with an outer dimension smaller than the outer dimension of the second bearing segment 52.

In some embodiments, as shown in fig. 11 and 12, the first step 55 is an annular step disposed along the circumferential direction of the bearing 5.

When first step 55 and base 12 are assembled, on the one hand, because first step 55 is annular, can not inject the position relative to base 12 to first step 55 along bearing 5 circumference, avoid rotating bearing 5 around the axis of bearing 5 to specific position and just can realize the cooperation of first step 55 and base 12 to the assembly efficiency between bearing 5 and base 12 has further been improved, on the other hand first step 55 is annular, can increase the cooperation area between base 12 and the first step 55, the joint strength between reinforcing base 12 and the bearing 5. In addition, the first step 55 is annular, so that the difficulty in molding the first step 55 can be reduced.

It is understood that the first step 55 may be non-annular, for example, the number of the first steps 55 is one or more, and when there are more, the plurality of first steps 55 may be sequentially spaced along the circumferential direction of the bearing 5.

In some embodiments, as shown in fig. 7, the bearing 5 includes: and a third bearing section 53, wherein the first bearing section 51, the second bearing section 52 and the third bearing section 53 are sequentially arranged along the axial direction of the bearing 5, a second step 56 is formed at the joint of the third bearing section 53 and the second bearing section 52, and the second step 56 is used for supporting the stator structure of the cooling fan 100.

The radiator fan 100 includes a stator structure, which is positioned on a copper-in-tube in the related art. After cancelling copper in the application and manage, still be equipped with second step 56 on the outer wall of bearing 5, second step 56 is used for supporting stator structure, realizes stator structure's location.

In some embodiments, the outer diameter of the third bearing segment 53 is smaller than the outer diameter of the second bearing segment 52 to form a second step 56.

The second step 56 is formed by setting the outer diameter of the third bearing section 53 to be smaller than the outer diameter of the second bearing section 52, that is, the second step 56 is formed by changing the size of each part on the outer wall surface of the bearing, so that the second step 56 is conveniently formed, and the processing difficulty of the bearing 5 is reduced.

The first bearing segment 51, the second bearing segment 52 and the third bearing segment 53 are sequentially arranged, and the shaft hole 54 penetrates through the first bearing segment 51, the second bearing segment 52 and the third bearing segment 53. In most cases, the bearing 5 is cylindrical, that is, the cross section of the bearing 5 (i.e., the pattern of the bearing 5 taken along a plane perpendicular to the axial direction of the bearing 5) has an inner ring (i.e., the shaft hole 54) which is circular and an outer ring which is circular, and the second step 56 can be formed by setting the outer diameter of the third bearing section 53 smaller than the outer diameter of the second bearing section 52. It will be appreciated that for the case where the bearing 5 is non-cylindrical, for example, where the inner race (i.e., the shaft bore 54) of the cross-section of the bearing 5 is circular and the outer race is polygonal, the formation of the second step 56 on the outer wall surface of the junction of the third bearing segment 53 and the second bearing segment 52 can be achieved by providing the third bearing segment 53 with a cross-sectional area that is less than the cross-sectional area of the second bearing segment 52 or the third bearing segment 53 with an outer dimension that is less than the outer dimension of the second bearing segment 52.

As shown in fig. 7, the outer diameter of the second bearing segment 52 is larger than the outer diameters of the first bearing segment 51 and the third bearing segment 53, and further, the first bearing segment 51 and the third bearing segment 53 are respectively located at two ends of the bearing 5 along the axial direction, when the bearing 5 is in a shape with a large middle part and small two ends.

In some embodiments, the second step 56 is an annular step disposed along the circumference of the bearing 5.

When the second step 56 is assembled with the stator structure, on one hand, because the second step 56 is annular, the position of the second step 56 relative to the stator structure along the circumferential direction of the bearing 5 can be unlimited, and the matching of the second step 56 and the stator structure can be realized only by rotating the bearing 5 to a specific position around the axis of the bearing 5, so that the assembling efficiency between the bearing 5 and the stator structure is further improved, on the other hand, the matching area between the stator structure and the second step 56 can be increased, and the connecting strength between the stator structure and the bearing 5 is enhanced. In addition, the second step 56 is annular, so that the difficulty in forming the second step 56 can be reduced.

It is understood that the second step 56 may be non-annular, for example, the number of the second steps 56 is one or more, and when there are more, the plurality of second steps 56 may be arranged in the circumferential direction of the bearing 5.

In some embodiments, the bearing 5 is a powder metallurgy oil bearing 5.

In the prior art, the bearing 5 is mainly formed in a machining mode, and the forming precision of the bearing 5 is difficult to guarantee due to the fact that multiple steps such as clamping are involved in forming, so that the bearing 5 is positioned by adopting multiple parts such as a copper-in-pipe and a pressure ring, and the requirement for the machining precision of the bearing 5 is lowered.

Through the cooperation of first step 55 and base 12 in this application, realize the direct assembly between bearing 5 and the base 12, reduced the quantity of part, so require bearing 5's machining precision high, the machining precision and the stability of size of first step 55 and second step 56 are difficult to guarantee in traditional machining. And adopt powder metallurgy technology processing first step 55 and second step 56, because the processing precision of bearing 5 can effectual improvement to the technological characteristics of powder metallurgy technology self, so can guarantee bearing 5 and the direct complex cooperation effect of base 12.

Specifically, powder metallurgy is a process technology for manufacturing metal materials, composite materials and various products by using metal powder as a main raw material through forming and sintering, and mainly comprises the steps of uniformly mixing copper powder, iron powder and other powders, putting the powders into a forming machine for pressure forming, sintering a formed product, finishing and cleaning the sintered product, performing an oil immersion process and the like. As the powder metallurgy process adopts a mode of pressure forming in a die to manufacture the product, the precision and the dimensional stability of the bearing 5 can be improved, the good matching between the bearing 5 and the base 12 is ensured, and meanwhile, the manufacturing cost is correspondingly reduced.

The porous bearing 5, which is the oil-impregnated bearing 5, is made of a metal powder such as a copper-based powder or an iron-based powder as a main raw material, and the oil-impregnated bearing 5 is a sintered body produced by a powder metallurgy method. The oil-impregnated bearing 5 is impregnated with a lubricating oil of a certain volume fraction, for example, 10% to 40%, by utilizing the porosity of the sintered body, and is used in a self-lubricating state, and has the advantages of low cost, vibration absorption, low noise, no need of adding the lubricating oil for a long working time, and the like.

An embodiment of the second aspect of the present invention provides a heat dissipation fan 100, including: a housing 1 and a bearing 5 as in any of the embodiments of the first aspect.

The housing 1 defines an installation space 13, the housing 1 including a base 12; the bearing 5 is located in the installation space 13, and the first step 55 of the bearing 5 is supported on the base 12.

The utility model discloses radiator fan 100 that the embodiment of second aspect provided supports first step 55 through base 12, realizes the direct cooperation between base 12 and the bearing 5 to pipe and clamping ring in the copper has been saved, radiator fan 100's structure has been simplified, has reduced radiator fan 100's cost and assembly complexity.

In some embodiments, as shown in FIG. 7, the base 12 defines a mounting hole 121, and the first bearing segment 51 is located in the mounting hole 121 and is in interference fit with the mounting hole 121.

On the basis that the first step 55 is matched with the base 12, the first bearing section 51 penetrates through the mounting hole 121 and is in interference fit with the mounting hole 121, so that the first bearing section 51 is limited in the mounting hole 121, the positioning of the bearing 5 on the base 12 is realized, and the stability and the reliability of connection between the base 12 and the bearing 5 are further improved. And the interference fit structure is simple in structure, and other positioning parts do not need to be arranged on the base 12 and the bearing 5 like other positioning structures.

In some embodiments, the mounting hole 121 is provided at the outer circumference thereof with a support protrusion 122 protruding toward the first step 55, and the support protrusion 122 abuts against the first step 55 to support the first step 55.

The mounting hole 121 protrudes towards the outer periphery of one side of the first step 55 to form a supporting protrusion 122, the supporting protrusion 122 is located on the outer side of the first bearing section 51, one end, away from the mounting hole 121, of the supporting protrusion 122 is abutted against the step surface of the first step 55, so that the supporting protrusion 122 supports the first step 55, and the base 12 supports the bearing 5. And the periphery of the mounting hole 121 is protruded to form a supporting protrusion 122, so that the supporting protrusion 122 is arranged close to the mounting hole 121, and the compactness of the matching structure of the bearing 5 and the base 12 is improved. Wherein, the direction close to the axis of the bearing 5 is inner, and the direction far away from the axis of the bearing 5 is outer.

As shown in fig. 7, the first step 55 is located on the left side of the mounting hole 121, the inner wall surface of the left side of the mounting hole 121 protrudes rightward to form a support protrusion 122, and the left end of the support protrusion 122 abuts on the step surface on the first step 55.

Optionally, the shape of the support protrusion 122 is adapted to the shape of the first step 55. For example, when the first step 55 is an annular step arranged along the circumferential direction of the bearing 5, the supporting protrusion 122 is also annular, the supporting protrusion 122 is sleeved outside the first bearing section 51, the supporting protrusion 122 of the whole circle supports the first step 55 of the whole circle, the matching area between the supporting protrusion 122 and the first step 55 is increased, and the supporting strength of the supporting protrusion 122 to the bearing 5 is enhanced; when the first steps 55 are plural and the plural first steps 55 are arranged at intervals along the circumferential direction of the bearing 5, the number of the supporting protrusions 122 is equal to that of the first steps 55 and corresponds to one another, each supporting protrusion 122 supports the corresponding first step 55, the first bearing section 51 is inserted into a space surrounded by the plural supporting protrusions 122, and the tail end of the first bearing section 51 is in interference fit with the mounting hole 121.

In some embodiments, as shown in fig. 7, the heat dissipation fan 100 includes: the printed circuit board 4 is arranged on the base 12, and the printed circuit board 4 is sleeved outside the supporting bulge 122.

The printed circuit board 4 is fixed on the base 12, the printed circuit board 4 is provided with a second accommodating hole 41, and the supporting protrusion 122 is located in the second accommodating hole 41, so that the printed circuit board 4 is sleeved outside the supporting protrusion 122, and the printed circuit board 4 is fixed on the base 12.

In some embodiments, the heat dissipation fan 100 includes: and the stator structure is sleeved on the outer side of the bearing 5 and supported on the second step 56 of the bearing 5.

The stator structure is sleeved outside the bearing 5, and the second step 56 is used for supporting the stator structure, so that the positioning between the stator structure and the bearing 5 is realized, and the assembly of the stator structure is realized.

The heat dissipation fan 100 further includes a rotor structure 2, the shaft 6 includes a first end portion 61 and a second end portion 62, the first end portion 61 is fixed on the rotor structure 2 and rotates with the rotor structure 2 relative to the stator structure, and the second end portion 62 is rotatably disposed in the shaft hole 54. Furthermore, the rotor structure 2 is connected with a fan blade 21, and the rotation of the rotating shaft 6 and the rotor structure 2 drives the fan blade 21 to rotate.

Further, the housing 1 includes an upper cover 11, the upper cover 11 is covered on the base 12, and defines an installation space 13 together with the base 12, and the bearing 5, the stator structure, the rotor structure 2, and the printed circuit board 4 are all located in the installation space 13.

In some embodiments, the stator structure is disposed outside of the third bearing segment 53 of the bearing 5 and is in interference fit with the third bearing segment 53.

On the basis that the stator structure is supported on the second step 56, the stator structure is sleeved on the outer side of the third bearing section 53 and is in interference fit with the third bearing section 53, so that the stator structure is positioned relative to the bearing 5, and further, the stator structure is stably installed on the bearing 5. And the interference fit structure, simple structure need not to set up other locating component on stator structure and bearing 5 like other location structure.

Further, the stator structure includes the iron core 3, the iron core 3 is provided with a first accommodation hole 31, the third bearing segment 53 is located in the first accommodation hole 31, that is, the iron core 3 is sleeved on the outer side of the third bearing segment 53 of the bearing 5, and the third bearing segment 53 is in interference fit with the first accommodation hole 31.

To sum up, the embodiment of the utility model provides a bearing 5, based on powder metallurgy bearing 5's manufacturing process, process out first step 55 and second step 56 on bearing 5, first step 55 supports on base 12, realizes the direct assembly between bearing 5 and the base 12, has saved two parts of pipe and clamping ring in the copper, has reduced radiator fan 100's cost and has improved assembly efficiency. The second step 56 supports the stator structure, and the stator structure is sleeved outside the third bearing section 53 and is in interference fit with the third bearing section 53, thereby realizing the positioning between the stator structure and the bearing 5.

In the description of the present invention, the term "plurality" means two or more unless explicitly stated or limited otherwise; the terms "connected," "secured," and the like are to be construed broadly and unless otherwise stated or indicated, and for example, "connected" may be a fixed connection, a removable connection, an integral connection, or an electrical connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or unit indicated must have a specific direction, be constructed in a specific orientation, and be operated, and therefore, should not be construed as limiting the present invention.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A bearing, comprising:

the bearing comprises a first bearing section and a second bearing section which are sequentially arranged along the axial direction of the bearing, wherein a first step is arranged at the joint of the outer wall surface of the first bearing section and the outer wall surface of the second bearing section, and the first step is used for supporting the bearing on a base of a cooling fan.

2. The bearing of claim 1,

the first bearing segment has an outer diameter less than an outer diameter of the second bearing segment to form the first step.

3. The bearing of claim 1,

the first step is an annular step arranged along the circumferential direction of the bearing.

4. A bearing according to any of claims 1 to 3, comprising:

the third bearing section is followed the axial of bearing, first bearing section the second bearing section with the third bearing section sets gradually, the third bearing section with the junction of second bearing section forms the second step, the second step is used for supporting radiator fan's stator structure.

5. The bearing of claim 4,

the third bearing segment has an outer diameter less than an outer diameter of the second bearing segment to form the second step.

6. The bearing of claim 4,

the second step is an annular step arranged along the circumferential direction of the bearing.

7. Bearing according to any of claims 1 to 3,

the bearing is a powder metallurgy oil-retaining bearing.

8. A heat dissipating fan, comprising:

a housing defining an installation space, the housing including a base; and

the bearing of any one of claims 1 to 7, the bearing being located within the mounting space with the first step of the bearing supported on the base.

9. The heat dissipating fan of claim 8,

the base is limited with a mounting hole, and a first bearing section of the bearing is positioned in the mounting hole and is in interference fit with the mounting hole.

10. The heat dissipating fan of claim 9,

the periphery of the mounting hole is provided with a supporting bulge protruding towards the first step, and the supporting bulge is abutted against the first step to support the first step.

11. The heat dissipating fan as claimed in claim 10, comprising:

and the printed circuit board is arranged on the base and sleeved outside the supporting bulges.

12. The heat dissipation fan as claimed in any one of claims 8 to 11, comprising:

and the stator structure is sleeved on the outer side of the bearing and supported on the second step of the bearing.

13. The heat dissipating fan of claim 12,

the stator structure sleeve is arranged on the outer side of the third bearing section of the bearing and is in interference fit with the third bearing section.

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