Fan bearing fixing anti-sliding structure

Abstract

The invention provides a fan bearing fixing anti-sliding structure. The fan bearing fixing anti-sliding structure comprises a fan frame, a shaft core, two bearings and a first spring. A base provided with a bearing sleeve in a protruding mode is arranged on the air outlet side of the fan frame. The shaft core is arranged in the bearing sleeve; the two bearings are respectively mounted in the bearing sleeves and arranged on the shaft core, and each bearing comprises an inner ring matched with the shaft core and an outer ring matched with the corresponding bearing sleeve; the first spring is arranged on the shaft core in a sleeved mode and located between the inner rings of the two bearings, axial force for elastic supporting is generated between the two inner rings, the two inner rings are fixed to the preset positions, and therefore radial relative sliding between the inner rings of the two bearings and the shaft core is limited, the stability of the two bearings is improved, and the service life of the two bearings is prolonged.

Description

Technical Field

[0001] The invention relates to a bearing fixing structure, and in particular to a fan bearing fixing anti-slip structure. Background Art

[0002] like Figure 1 The fan bearing structure shown includes a fan blade 11, a base bracket 12, two bearings 13, 14 and upper and lower springs 151, 152. The fan blade 11 is provided with a rotating shaft core 111, the base bracket 12 is provided with a bearing sleeve 121, the two bearings 13, 14 are respectively installed in the bearing sleeve 121, the rotating shaft core 111 cooperates with the two bearings 13, 14, a baffle 122 is provided in the bearing sleeve 121, and the two bearings 13, 14 are distributed above and below the baffle 122. The upper and lower springs 151, 152 are respectively arranged between the baffle 122 and the two bearings 13, 14, and apply pressure to the outer rings of the bearings 13, 14 to ensure that the outer ring track is stable and the force is balanced when the bearing is running. This double spring design enables the balls in the bearings 13, 14 to run smoothly and reduce the ball friction noise when the fan is at low speed. Meanwhile, during installation and transportation, the springs 151 and 152 provide effective buffering protection for the bearings 13 and 14, thereby reducing bearing damage caused by external impact.

[0003] However, the structure mainly focuses on the stability of the outer rings of bearings 13 and 14, and fails to fully solve the radial sliding problem between the inner rings of the bearings and the rotating shaft core 111 during high-speed operation. Therefore, under high-speed operation conditions, there is still a risk of premature bearing failure due to radial sliding.

[0004] Furthermore, the bearing assembly in the current fan may adopt the following two methods:

[0005] 1. Clearance fit fixation: This method uses a clearance fit between the inner ring of the bearing and the rotating shaft core, and the outer ring of the bearing and the bearing sleeve also use the same clearance fit. Although this type of assembly is simple in process, has high assembly efficiency and low cost. However, there is a clearance fit between the inner ring of the bearing and the rotating shaft core, and between the outer ring of the bearing and the bearing sleeve. Therefore, as the fan speed increases, the centrifugal force generated by the high-speed operation of the fan blades causes the friction force to be insufficient to overcome radial sliding. After long-term operation, the bearing is prone to wear and failure, shortening the life of the fan.

[0006] 2. Interference fit and glue fixation: This method uses interference fit between the inner ring of the bearing and the rotating shaft core, and glue fixation between the outer ring of the bearing and the bearing sleeve. However, its assembly process is complicated and requires precise dimensional control and accurate control of the amount of glue, resulting in low assembly efficiency and significantly increased manufacturing costs. In addition, when the fan is impacted by external forces, micro cracks are easily generated at the glue joint, causing the preload inside the bearing to be lost. At this time, the ball cannot remain on the predetermined raceway of the inner and outer rings, causing micro-motion wear and ultimately leading to premature failure of the bearing.

[0007] Therefore, the above two assemblies have obvious deficiencies in terms of high-speed operation stability and cost control: (1) The bearings are assembled in a clearance fit manner and cannot effectively resist radial sliding at high speeds. (2) The bearings are assembled in an interference fit and glue fixation manner, which has a high assembly cost and is still prone to failure under the influence of external forces. As a result, the existing technology is difficult to simultaneously meet the requirements of high-speed stability of the fan and simple assembly and cost control.

[0008] Therefore, how to solve the above-mentioned conventional problems and deficiencies is the direction that the inventor of this case and related manufacturers engaged in this industry are eager to study and improve. Summary of the invention

[0009] The object of the present invention is to provide a fan bearing fixing and anti-slip structure which can solve the above-mentioned problem.

[0010] The present invention provides a fan bearing fixing and anti-slip structure, which is characterized by comprising:

[0011] A fan frame has a base, and a protruding bearing sleeve is provided on the base;

[0012] An axis core having a connecting end and a free end, wherein the connecting end is connected to a fan wheel, and the free end extends into the bearing sleeve;

[0013] A first bearing and a second bearing are located in the bearing sleeve and are disposed on the shaft core. The first bearing and the second bearing include an inner ring and an outer ring and a plurality of rolling elements disposed between the inner ring and the outer ring. The outer ring matches the bearing sleeve, and the inner ring matches the shaft core.

[0014] A first spring is sleeved on the shaft core and located between the first bearing and the second bearing. Two ends of the first spring respectively abut against the inner rings of the first bearing and the second bearing to form an axial force of elastic support between the inner rings of the first bearing and the second bearing, so that the inner rings of the first bearing and the second bearing are firmly fixed at a predetermined position, and the radial relative sliding between the inner rings of the first bearing and the second bearing and the shaft core is limited when the fan is running at a high speed.

[0015] The fan bearing fixing and anti-slip structure, wherein: the bearing sleeve has an upper abutment portion and a lower abutment portion, and the first bearing and the second bearing are respectively arranged on the upper abutment portion and the lower abutment portion.

[0016] The fan bearing fixing anti-slip structure, wherein: a second spring is provided between the outer ring of the second bearing and the lower abutting portion, and one end of the second spring abuts against the lower abutting portion, and the other end abuts against the outer ring of the second bearing.

[0017] The fan bearing fixing and anti-slip structure, wherein: the shaft core has a neck adjacent to the free end, and the neck is buckled by a buckle ring, and the buckle ring abuts against the inner ring of the second bearing from the other side of the second bearing.

[0018] The fan bearing fixing and anti-slip structure, wherein: the outer ring of the first bearing abuts against the upper abutting portion.

[0019] In this way, the stability of the first and second bearings can be effectively improved and their service life can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the conventional technology;

[0021] Figure 2 It is a schematic diagram of a sectional exploded view of the present invention;

[0022] Figure 3 It is a partial cross-sectional combined schematic diagram of the present invention;

[0023] Figure 4 for Figure 3 A partial enlarged view of

[0024] Figure 5 for Figure 3 A partial enlarged view of .

[0025] Explanation of the reference numerals: 21 fan frame; 211 base; 212 bearing sleeve; 213 upper abutment portion; 214 lower abutment portion; 22 shaft core; 221 connecting end; 222 free end; 223 neck; 23 first bearing; 231 inner ring; 232 outer ring; 233 rolling element; 24 second bearing; 241 inner ring; 242 outer ring; 243 rolling element; 25 first spring; 26 retaining ring; 27 fan wheel; 28 stator; 29 second spring. DETAILED DESCRIPTION

[0026] The above-mentioned objects and the structural and functional characteristics of the present invention will be described based on the preferred embodiments shown in the accompanying drawings.

[0027] Please refer to the attached picture. Figure 2 It is a schematic diagram of a sectional exploded view of the present invention; Figure 3It is a partial cross-sectional combined schematic diagram of the present invention; Figure 4 for Figure 3 A partial enlarged view of Figure 5 for Figure 3 A partial enlarged view of .

[0028] As shown in the figure, the present invention provides a fan bearing fixing and anti-slip structure, which includes a fan frame 21 , a shaft core 22 , a first bearing 23 , a second bearing 24 and a first spring 25 .

[0029] The fan frame 21 has an air inlet side and an air outlet side, and a base 211 is provided on the air outlet side, and the base 211 protrudes upward to form a hollow bearing sleeve 212. A stator 28 is provided on the outside of the bearing sleeve 212, and the stator 28 is installed around the bearing sleeve 212. An upper abutment portion 213 and a lower abutment portion 214 are provided inside the bearing sleeve 212, which are respectively located at the upper end and the lower end of the bearing sleeve 212, and are arranged on the inner wall in a stepped form to provide positioning support for the bearing.

[0030] The shaft core 22 includes a connecting end 221 and a free end 222. The connecting end 221 is used to fix the impeller 27, and the free end 222 extends into the bearing sleeve 212. A neck 223 is provided adjacent to the free end 222 for further installation of other components.

[0031] The first bearing 23 and the second bearing 24 are installed in the bearing sleeve 212 and are respectively disposed on the upper abutment portion 213 and the lower abutment portion 214. The first bearing 23 and the second bearing 24 each include an inner ring 231, 241, an outer ring 232, 242, and a plurality of rolling elements 233, 243 disposed between the inner ring 231, 241 and the outer ring 232, 242. The inner ring 231, 241 and the outer ring 232, 242 rotate relative to each other through the rolling elements 233, 243. The outer ring 232, 242 matches the inner side of the bearing sleeve 212 (for example, the outer diameter of the outer ring 232, 242 matches the inner diameter of the bearing sleeve 212). The inner rings 231 and 241 match the outer surface of the shaft core 22 and are arranged on the shaft core (for example, the inner diameters of the inner rings 231 and 241 match the outer diameter of the shaft core 22), so that the first and second bearings 23 and 24 can stably support the rotation of the shaft core 22 and the impeller 27.

[0032] The outer ring 232 of the first bearing 23 abuts against the upper abutting portion 213, and the first spring 25 is sleeved on the shaft core 22 and is located between the inner ring 231 of the first bearing 23 and the inner ring 241 of the second bearing 24. The two ends of the first spring 25 are respectively tightly abutted against the inner ring 231 of the first bearing 23 and the inner ring 241 of the second bearing 24, providing elastic support and positioning.

[0033] In addition, a second spring 29 is provided between the outer ring 242 of the second bearing 24 and the lower abutment portion 214. One end of the second spring 29 abuts against the lower abutment portion 214, and the other end contacts the outer ring 242 of the second bearing 24. The free end 222 of the shaft core 22 passes through the inner ring 241 of the second bearing 24 and extends downward. The neck 223 of the free end 222 is buckled with a retaining ring 26, and the retaining ring 26 presses the inner ring 241 from the lower side of the second bearing 24, forming a limiting effect on the second bearing 24 and the second spring 29, preventing them from being separated from the shaft core 22 and the bearing sleeve 212.

[0034] Through the above arrangement, the pre-pressure generated by the first spring 25 forms an axial force of elastic support between the inner ring 231 of the first bearing 23 and the inner ring 241 of the second bearing 24, so that the two inner rings 231, 241 are firmly fixed at a predetermined position, thereby limiting the radial relative sliding between the inner rings 231, 241 and the shaft core 22 when the impeller 27 runs at a high speed. This structure not only improves the stability of the first bearing 23 and the second bearing 24, but also prolongs their service life.

[0035] The above is a detailed description of the present invention, and the above is only a preferred embodiment of the present invention, which should not limit the scope of the present invention. That is, all equivalent changes and modifications made according to the present invention should still fall within the scope of the patent of the present invention.

Claims

1. A fan bearing fixing and anti-slip structure, characterized in that: include: A fan frame has a base, and a protruding bearing sleeve is provided on the base; An axis core having a connecting end and a free end, wherein the connecting end is connected to a fan wheel, and the free end extends into the bearing sleeve; A first bearing and a second bearing are located in the bearing sleeve and are disposed on the shaft core. The first bearing and the second bearing include an inner ring and an outer ring and a plurality of rolling elements disposed between the inner ring and the outer ring. The outer ring matches the bearing sleeve, and the inner ring matches the shaft core. A first spring is sleeved on the shaft core and located between the first bearing and the second bearing. Two ends of the first spring respectively abut against the inner rings of the first bearing and the second bearing to form an axial force of elastic support between the inner rings of the first bearing and the second bearing, so that the inner rings of the first bearing and the second bearing are firmly fixed at a predetermined position, and the radial relative sliding between the inner rings of the first bearing and the second bearing and the shaft core is limited when the fan is running at a high speed.

2. The fan bearing fixing and anti-slip structure according to claim 1, characterized in that: The bearing sleeve has an upper abutment portion and a lower abutment portion therein, and the first bearing and the second bearing are respectively arranged on the upper abutment portion and the lower abutment portion.

3. The fan bearing fixing and anti-slip structure according to claim 2, characterized in that: A second spring is arranged between the outer ring of the second bearing and the lower abutting portion, and one end of the second spring abuts against the lower abutting portion, and the other end abuts against the outer ring of the second bearing.

4. The fan bearing fixing and anti-slip structure according to claim 3, characterized in that: The shaft core has a neck adjacent to the free end, and the neck is buckled by a buckle ring, and the buckle ring abuts against the inner ring of the second bearing from the other side of the second bearing.

5. The fan bearing fixing and anti-slip structure according to claim 2, characterized in that: The outer ring of the first bearing abuts against the upper abutting portion.

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