Fan bearing fixing anti-sliding structure with shaft sleeve

Abstract

The utility model 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] This utility model relates to a bearing fixing structure, and more particularly to a fan bearing fixing and anti-slip structure with a bushing. Background Technology

[0002] like Figure 1 The fan bearing structure shown includes a fan blade 11, a base bracket 12, two bearings 13 and 14, and upper and lower springs 151 and 152. The fan blade 11 has a rotating shaft 111, and the base bracket 12 has a bearing sleeve 121. The two bearings 13 and 14 are respectively installed inside the bearing sleeve 121. The rotating shaft 111 cooperates with the two bearings 13 and 14. A baffle 122 is provided inside the bearing sleeve 121, with the two bearings 13 and 14 distributed above and below the baffle 122. The upper and lower springs 151 and 152 are respectively positioned between the baffle 122 and the two bearings 13 and 14, applying pressure to the outer rings of the bearings 13 and 14 to ensure smooth and balanced force distribution on the outer ring track during operation. This double-spring design allows the balls inside the bearings 13 and 14 to rotate smoothly, reducing ball friction noise at low fan speeds. Meanwhile, during installation and transportation, springs 151 and 152 provide effective buffer protection for bearings 13 and 14, reducing bearing damage caused by external impact.

[0003] However, this design primarily focuses on the stability of the outer rings of bearings 13 and 14, failing to adequately address the radial slippage between the inner ring of the bearing and the rotating shaft 111 during high-speed operation. Therefore, under high-speed operating conditions, there remains a risk of premature bearing failure due to radial slippage.

[0004] Furthermore, the bearing assembly within current fans may employ one of the following two methods:

[0005] 1. Clearance Fit Fixing: This method uses a clearance fit between the bearing inner ring and the shaft, and the same clearance fit between the bearing outer ring and the bearing housing. While this assembly method is simple, efficient, and low-cost, the clearance fit between the bearing inner ring and the rotating shaft, and between the bearing outer ring and the bearing housing, means that as the fan speed increases, the centrifugal force generated by the high-speed operation of the fan blades becomes insufficient to overcome radial slippage. After prolonged operation, the bearing is prone to wear and failure, shortening the fan's lifespan.

[0006] 2. Interference Fit and Adhesive Fixing: This method uses an interference fit between the inner ring of the bearing and the rotating shaft, while the outer ring of the bearing and the bearing housing are fixed with adhesive. However, the assembly process is complex, requiring precise dimensional control and accurate control of adhesive usage, resulting in low assembly efficiency and significantly increased manufacturing costs. Furthermore, when the fan is subjected to external impact, micro-cracks can easily form at the adhesive joint, causing the bearing to lose preload. At this point, the balls cannot remain on the predetermined raceways of the inner and outer rings, causing fretting wear and ultimately leading to premature bearing failure.

[0007] Therefore, both of the above-mentioned assembly methods have obvious shortcomings in terms of high-speed operation stability and cost control: (1) The bearing is assembled with a clearance fit, which cannot effectively resist radial sliding at high speeds. (2) The bearing is assembled with an interference fit and glue fixation, which has excessively high assembly costs and is still prone to failure under external force. This makes it difficult for the existing technology to simultaneously meet the requirements of high-speed fan stability, simple assembly, and cost control.

[0008] Therefore, how to solve the aforementioned problems and shortcomings is the direction that the designers of this case and related manufacturers in this industry urgently want to study and improve. Utility Model Content

[0009] The purpose of this invention is to provide a fan bearing fixing and anti-slip structure with a bushing that can solve the above problems.

[0010] This utility model provides a fan bearing fixing and anti-slip structure with a bushing, characterized in that it includes:

[0011] A fan frame having a base on which a protruding bearing sleeve is provided;

[0012] A shaft has a connecting end and a free end, the connecting end being connected to a fan wheel, and the free end extending into the bearing sleeve;

[0013] A first bearing and a second bearing are located inside the bearing housing and disposed on the shaft. 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 mates with the bearing housing and the inner ring mates with the shaft.

[0014] A first bushing and a second bushing are respectively fitted on the shaft and located between the inner rings of the first bearing and the second bearing. The first bushing abuts against the inner ring of the first bearing from below, and the second bushing 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 bushing and the second bushing. The two ends of the first spring abut against the first bushing and the second bushing respectively, so as 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 bushing and the second bushing, and to fix the inner ring of the first bearing and the inner ring of the second bearing firmly in a predetermined position through the first bushing and the second bushing, thereby restricting the radial relative sliding between the inner ring of the first bearing and the inner ring of the second bearing and the shaft during the high-speed operation of the fan.

[0016] Wherein: the bearing cylinder has an upper abutment part and a lower abutment part, and the first bearing and the second bearing are respectively disposed in the upper abutment part and the lower abutment part.

[0017] Wherein: a second spring is provided between the outer ring of the second bearing and the lower abutment, and one end of the second spring abuts the lower abutment and the other end abuts the outer ring of the second bearing.

[0018] Wherein: the shaft has a neck adjacent to the free end, and the neck is fastened by a retaining ring that 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 abutment portion.

[0020] This effectively limits the radial relative sliding between the inner rings of the first and second bearings and the shaft during high-speed fan operation, improving the stability of the first and second bearings and extending their service life. Attached Figure Description

[0021] Figure 1 A schematic diagram of a known technology;

[0022] Figure 2 This is an exploded cross-sectional view of the present invention;

[0023] Figure 3 This is a partial cross-sectional view of the present invention.

[0024] Figure 4 for Figure 3 A magnified view of a portion of the image;

[0025] Figure 5 for Figure 3 A magnified view of a portion of the image.

[0026] Explanation of reference numerals in the attached drawings: 21 Fan frame; 211 Base; 212 Bearing cylinder; 213 Upper abutment; 214 Lower abutment; 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 Buckle; 27 Fan wheel; 28 Stator; 29 Second spring; 301, 302 Bushings. Detailed Implementation

[0027] The above-mentioned objectives of this utility model and its structural and functional characteristics will be described with reference to the preferred embodiments shown in the accompanying drawings.

[0028] Please refer to the attached image. Figure 2 This is an exploded cross-sectional view of the present invention; Figure 3 This is a partial cross-sectional view of the present invention. Figure 4 for Figure 3 A magnified view of a portion of the image; Figure 5 for Figure 3 A magnified view of a portion of the image.

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

[0030] The fan frame 21 has an air inlet side and an air outlet side. 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 outer side of the bearing cylinder 212, and the stator 28 is mounted around the bearing cylinder 212. Inside the bearing cylinder 212, there is an upper abutment part 213 and a lower abutment part 214, which are located at the upper end and lower end of the bearing cylinder 212, respectively, and are arranged in a stepped form on the inner wall 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 fan wheel 27, while the free end 222 extends into the bearing cylinder 212. A neck 223 is provided at the end of the free end 222 for further installation of other components.

[0032] The first bearing 23 and the second bearing 24 are installed inside the bearing housing 212 and are respectively disposed in the upper abutment portion 213 and the lower abutment portion 214. Each bearing 23 and bearing 24 includes: an inner ring 231, 241 that mates with the shaft 22; and an outer ring 232, 242 that mates with the inner wall of the bearing housing 212. A plurality of rolling elements 233, 243 are disposed between the inner rings 231, 241 and the outer rings 232, 242, allowing the inner rings 231, 241 and the outer rings 232, 242 to rotate relative to each other.

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

[0034] The first spring 25 is sleeved on the shaft 22 and located between the first bushing 301 and the second bushing 302. Its two ends abut against the first bushing 301 and the second bushing 302 respectively, so as to form an axial force for elastic support between the first and second bushings 301 and 302. The axial force is then applied to the inner rings 231 and 241 of the first bearing 23 and the second bearing 24 through the first and second bushings 301 and 302.

[0035] Thus, by using the first and second bushings 301 and 302, which cooperate with the first spring 25, the first spring 25 is allowed to directly contact the first and second bushings 301 and 302. This prevents its force from 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 stress and improving the lifespan of the inner rings 231 and 241. At the same time, the first and second bushings 301 and 302 can provide stable support, preventing the first spring 25 from shifting due to movement or vibration. Furthermore, by using the first and second bushings 301 and 302 as positioning elements, the positions of the inner rings 231 and 241 and the first spring 25 can be stabilized during assembly.

[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 engaged with a retaining ring 26, which presses the inner ring 241 from the lower side of the second bearing 24, thus limiting the second bearing 24 and the second spring 29 and preventing them from disengaging from the shaft 22 and the bearing sleeve 212.

[0037] With the above configuration, 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 bushings 301 and 302, thereby forming an axial force with elastic support between the inner rings 231 and 241, which firmly fixes the two inner rings 231 and 241 in a predetermined position. When the fan wheel 27 rotates at high speed, the first and second bushings 301 and 302 form a fixed point, restricting 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 present invention has been described in detail above. However, the above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent variations and modifications made based on the present invention should still fall within the patent coverage of the present invention.

Claims

1. A fan bearing fixing and anti-slip structure with a bushing, characterized in that, include: A fan frame having a base on which a protruding bearing sleeve is provided; A shaft has a connecting end and a free end, the connecting end being connected to a fan wheel, and the free end extending into the bearing sleeve; A first bearing and a second bearing are located inside the bearing housing and disposed on the shaft. 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 mates with the bearing housing and the inner ring mates with the shaft. A first bushing and a second bushing are respectively fitted on the shaft and located between the inner rings of the first bearing and the second bearing. The first bushing abuts against the inner ring of the first bearing from below, and the second bushing abuts against the inner ring of the second bearing from above. A first spring is sleeved on the shaft and located between the first bushing and the second bushing. The two ends of the first spring abut against the first bushing and the second bushing respectively, so as 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 bushing and the second bushing, and to fix the inner ring of the first bearing and the inner ring of the second bearing firmly in a predetermined position through the first bushing and the second bushing, thereby restricting the radial relative sliding between the inner ring of the first bearing and the inner ring of the second bearing and the shaft during the high-speed operation of the fan.

2. The fan bearing fixing and anti-slip structure with bushing as described in claim 1, characterized in that: The bearing housing has an upper abutment portion and a lower abutment portion, and the first bearing and the second bearing are respectively disposed in the upper abutment portion and the lower abutment portion.

3. The fan bearing fixing and anti-slip structure with bushing as described in claim 2, characterized in that: A second spring is provided between the outer ring of the second bearing and the lower abutment, with one end of the second spring abutting the lower abutment and the other end abutting the outer ring of the second bearing.

4. The fan bearing fixing and anti-slip structure with bushing as described in claim 3, characterized in that: The shaft has a neck adjacent to the free end, and the neck is secured by a retaining ring that abuts against the inner ring of the second bearing from one side.

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

Images