Fan bearing fixing anti-sliding structure with shaft sleeve

Abstract

The invention provides a fan bearing fixing anti-sliding structure with shaft sleeves. The fan bearing fixing anti-sliding structure comprises a fan frame, a shaft rod, two bearings, two shaft sleeves and a first spring. The fan frame is provided with a base which is convexly provided with a bearing cylinder; the shaft rod is arranged in the bearing cylinder; the two bearings are respectively mounted in the bearing cylinders and arranged on the shaft rod, and each bearing comprises an inner ring matched with the shaft rod and an outer ring matched with the corresponding bearing cylinder; the two shaft sleeves and the first spring are arranged on the shaft rod in a sleeved mode and located between the inner rings of the two bearings, the two shaft sleeves abut against the inner rings of the two bearings respectively, the first spring is located between the two shaft sleeves, and the two inner rings are fixed to preset positions through axial force of elastic supporting generated between the two inner rings by the two shaft sleeves. And the radial relative sliding between the inner rings and the shaft rod is limited, so that the stability of the bearing is improved, and the service life is prolonged.

Description

Technical Field

[0001] The invention relates to a bearing fixing structure, in particular to a fan bearing fixing anti-slip structure with a shaft sleeve. 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 111, the base bracket 12 is provided with a bearing cylinder 121, the two bearings 13, 14 are respectively installed in the bearing cylinder 121, the rotating shaft 111 cooperates with the two bearings 13, 14, a baffle 122 is provided in the bearing cylinder 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 allows 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 the bearings 13 and 14, and fails to fully solve the radial sliding problem between the inner rings of the bearings and the rotating shaft 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 shaft, and the outer ring of the bearing and the bearing barrel. Although this type of assembly is simple in process, has high assembly efficiency and low cost, there is a clearance fit between the inner ring of the bearing and the rotating shaft, and between the outer ring of the bearing and the bearing barrel. 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, and glue fixation between the outer ring of the bearing and the bearing cylinder. 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 with a shaft sleeve which can solve the above-mentioned problem.

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

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

[0012] A shaft 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 cylinder;

[0013] A first bearing and a second bearing are located in the bearing tube and are disposed on the shaft rod. 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 tube, and the inner ring matches the shaft rod.

[0014] A first sleeve and a second sleeve are respectively sleeved on the shaft and located between the inner rings of the first bearing and the second bearing, wherein the first sleeve abuts against the inner ring of the first bearing from below, and the second sleeve abuts against the inner ring of the second bearing from above;

[0015] A first spring is sleeved on the shaft and located between the first sleeve and the second sleeve. Two ends of the first spring respectively abut against the first sleeve and the second sleeve to form an axial force of elastic support between the inner ring of the first bearing and the inner ring of the second bearing through the first sleeve and the second sleeve, and the inner ring of the first bearing and the inner ring of the second bearing are firmly fixed at a predetermined position through the first sleeve and the second sleeve, so as to limit the radial relative sliding between the inner ring of the first bearing and the inner ring of the second bearing and the shaft when the fan is running at a high speed.

[0016] Wherein: the bearing tube 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.

[0017] Wherein: 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.

[0018] Wherein: the shaft 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 one side of the second bearing.

[0019] Wherein: the outer ring of the first bearing abuts against the upper abutting portion.

[0020] In this way, the radial relative sliding between the inner rings of the first and second bearings and the shaft during high-speed operation of the fan can be effectively limited, thereby improving the stability of the first and second bearings and extending their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the conventional technology;

[0022] Figure 2 It is a schematic diagram of a sectional exploded view of the present invention;

[0023] Figure 3 It is a partial cross-sectional combined schematic diagram of the present invention;

[0024] Figure 4 for Figure 3 A partial enlarged view of

[0025] Figure 5 for Figure 3 A partial enlarged view of .

[0026] Explanation of the reference numerals: 21 fan frame; 211 base; 212 bearing cylinder; 213 upper abutment portion; 214 lower abutment portion; 22 shaft; 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; 301, 302 sleeves. DETAILED DESCRIPTION

[0027] 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.

[0028] Please refer to the attached picture, Figure 2 It is a schematic diagram of a sectional exploded view of the present invention; Figure 3 It 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 .

[0029] As shown in the figure, the present invention provides a fan bearing fixing anti-slip structure with a sleeve, including the following elements: a fan frame 21, a shaft 22, a first bearing 23, a second bearing 24, a first sleeve 301, a second sleeve 302, and a first spring 25 and a second spring 29.

[0030] The fan frame 21 has an air inlet side and an air outlet side, and a base 211 is provided in the center of the air outlet side, and the base 211 protrudes upward to form a hollow bearing cylinder 212. A stator 28 is provided on the outside of the bearing cylinder 212, and the stator 28 is installed around the bearing cylinder 212. An upper abutment portion 213 and a lower abutment portion 214 are provided inside the bearing cylinder 212, which are respectively located at the upper end and the lower end of the bearing cylinder 212, and are arranged on the inner wall in a stepped form to provide positioning support for the bearing.

[0031] The shaft 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 tube 212. A neck 223 is provided at the end adjacent to the free end 222 for further installation of other components.

[0032] The first bearing 23 and the second bearing 24 are installed in the bearing tube 212 and are respectively arranged on the upper abutment portion 213 and the lower abutment portion 214. The first bearing 23 and the second bearing 24 both include: an inner ring 231, 241 matched with the shaft 22. An outer ring 232, 242 matched with the inner wall of the bearing tube 212. A plurality of rolling elements 233, 243 are arranged between the inner ring 231, 241 and the outer ring 232, 242, so that the inner ring 231, 241 and the outer ring 232, 242 can rotate relative to each other.

[0033] The first sleeve 301 and the second sleeve 302 are sleeved on the shaft 22 and located between the inner rings 231 and 241 of the first bearing 23 and the second bearing 24. Specifically, the first sleeve 301 is located below the first bearing 23 and abuts against the inner ring 231 thereof, and the second sleeve 302 is located above the second bearing 24 and abuts against the inner ring 241 thereof.

[0034] The first spring 25 is sleeved on the shaft 22 and is located between the first sleeve 301 and the second sleeve 302. Its two ends abut against the first sleeve 301 and the second sleeve 302 respectively to form an elastically supported axial force between the first and second sleeves 301, 302. The axial force is applied between the inner rings 231, 241 of the first bearing 23 and the second bearing 24 through the first and second sleeves 301, 302.

[0035] In this way, by setting the first and second sleeves 301 and 302 and cooperating with the first spring 25, the first spring 25 is directly in contact with the first and second sleeves 301 and 302, so as to avoid its force being directly applied to the small area of ​​the inner rings 231 and 241 of the first and second bearings 23 and 24, thereby dispersing the stress and improving the life of the inner rings 231 and 241. At the same time, the first and second sleeves 301 and 302 can provide stable support so that the first spring 25 will not be displaced due to movement or vibration. Furthermore, by using the first and second sleeves 301 and 302 as positioning elements, it can stabilize the position of the inner rings 231 and 241 and the first spring 25 during the assembly process.

[0036] 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, providing additional positioning support. The free end 222 of the shaft 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, which 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 22 and the bearing cylinder 212.

[0037] Through the above arrangement, the preload generated by the first spring 25 acts on the inner ring 231 of the first bearing 23 and the inner ring 241 of the second bearing 24 through the first and second sleeves 301 and 302, thereby forming an axial force of elastic support between the inner rings 231 and 241, so that the two inner rings 231 and 241 are firmly fixed at a predetermined position. When the impeller 27 is running at a high speed, the first and second sleeves 301 and 302 are used to form a fixed point to limit the radial relative sliding between the inner rings 231 and 241 and the shaft 22, thereby improving the stability of the first bearing 23 and the second bearing 24, and effectively extending their service life.

[0038] 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 be used to 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 with a sleeve, characterized in that: include: A fan frame has a base, and a protruding bearing cylinder is provided on the base; A shaft 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 cylinder; A first bearing and a second bearing are located in the bearing tube and are disposed on the shaft rod. 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 tube, and the inner ring matches the shaft rod. A first sleeve and a second sleeve are respectively sleeved on the shaft and located between the inner rings of the first bearing and the second bearing, wherein the first sleeve abuts against the inner ring of the first bearing from below, and the second sleeve abuts against the inner ring of the second bearing from above; A first spring is sleeved on the shaft and located between the first sleeve and the second sleeve. Two ends of the first spring respectively abut against the first sleeve and the second sleeve to form an axial force of elastic support between the inner ring of the first bearing and the inner ring of the second bearing through the first sleeve and the second sleeve, and the inner ring of the first bearing and the inner ring of the second bearing are firmly fixed at a predetermined position through the first sleeve and the second sleeve, so as to limit the radial relative sliding between the inner ring of the first bearing and the inner ring of the second bearing and the shaft when the fan is running at a high speed.

2. The fan bearing fixing and anti-slip structure with a sleeve as claimed in claim 1, characterized in that: The bearing tube 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 with a sleeve as claimed in 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 with a sleeve as claimed in claim 3, characterized in that: The shaft 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 one side of the second bearing.

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

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