A three-bearing pre-pressing load-sharing bearing system and a cooling fan

Abstract

The utility model discloses a three bearing pre -pressing even load bearing system and cooling fan, include: bearing sleeve, rotating shaft, its wear in bearing sleeve, bearing assembly is installed in bearing sleeve, is used for supporting rotating shaft, including first bearing, second bearing and third bearing that are arranged in sequence spaced apart from outside to inside along bearing sleeve axial direction, bearing inner ring pre -pressing subassembly is set up in the outer periphery of rotating shaft, is used for to the inner ring of bearing assembly with the force to fix bearing inner ring, bearing outer ring pre -pressing subassembly is set up in the inner periphery of bearing sleeve, is used for to the outer ring of bearing assembly with the force to eliminate play. The utility model provides bearing system and cooling fan, can realize even load effect of three bearings, eliminate the play in the bearing interior, improve the operation stability and life of bearing.

Description

Technical Field

[0001] This utility model relates to the field of axial flow fan technology, and in particular to a three-bearing preload-equalizing bearing system and a cooling fan. Background Technology

[0002] Cooling fans are indispensable heat dissipation components in modern electronic devices, and the performance of their core component, the bearing system, directly determines the fan's lifespan, noise level, and reliability. Currently, most common cooling fans use one or two bearings for support. Single-bearing systems are simple in structure but suffer from large axial clearance and poor shock resistance. While dual-bearing systems improve support, securing the inner and outer rings of the bearing remains difficult, and under multi-point loads or uneven thermal expansion conditions, the load can easily concentrate on a single bearing, leading to premature bearing failure and affecting the lifespan of the entire system (i.e., L10 life). Furthermore, the inherent clearance of the bearing also increases operating noise and rotor vibration. Utility Model Content

[0003] To address the aforementioned issues, the present invention aims to provide a three-bearing preload-equalizing bearing system and a cooling fan that can automatically eliminate clearance, achieve load equalization, and significantly improve system lifespan.

[0004] In view of the above problems, one of the technical solutions provided by this utility model is:

[0005] A three-bearing preload-sharing bearing system, comprising:

[0006] Bearing sleeve;

[0007] A rotating shaft, which passes through the bearing sleeve;

[0008] A bearing assembly, which is installed inside the bearing sleeve and is used to support the rotating shaft, includes a first bearing, a second bearing and a third bearing arranged sequentially from the outside to the inside along the axial direction of the bearing sleeve;

[0009] A bearing inner ring preload assembly is disposed on the outer periphery of the rotating shaft and is used to apply force to the inner ring of the bearing assembly to fix the bearing inner ring.

[0010] A bearing outer ring preload assembly, disposed on the inner circumference of the bearing sleeve, is used to apply force to the outer ring of the bearing assembly to eliminate clearance.

[0011] In some embodiments, the inner ring of the second bearing is interference-fitted with the rotating shaft, and the inner rings of the second and third bearings are clearance-fitted with the rotating shaft and confined on the rotating shaft.

[0012] In some embodiments, the inner wall of the bearing sleeve is provided with a limiting boss extending inwardly, and the outer ring of the second bearing abuts against the limiting boss.

[0013] In some embodiments, the bearing inner ring preload assembly includes a bearing inner ring elastic preload member compressed between the inner rings of the second bearing and the third bearing, and a rigid support ring disposed between the inner rings of the second bearing and the first bearing.

[0014] Alternatively, the bearing inner ring preload assembly may include two bearing inner ring elastic preload members disposed between the inner rings of the first bearing and the second bearing, and disposed between the inner rings of the second bearing and the third bearing.

[0015] In some of these embodiments, the rigid support ring is a stainless steel support ring.

[0016] In some of these embodiments, the bearing inner ring elastic preload element is a spring.

[0017] In some embodiments, the bearing outer ring preload assembly includes a first bearing outer ring elastic preload member that is compressed between the outer rings of the first bearing and the second bearing, and a second bearing outer ring elastic preload member that is compressed between the outer ring of the third bearing and the limiting boss.

[0018] In some embodiments, the first bearing outer ring elastic preload member and the second bearing outer ring elastic preload member are springs.

[0019] In some of these embodiments, the first bearing, the second bearing, and the third bearing are ball bearings.

[0020] Based on the above problems, the second technical solution provided by this utility model is:

[0021] A cooling fan comprising the three-bearing preload-equalizing bearing system described in any one of the preceding claims.

[0022] Compared with the prior art, the advantages of this utility model are:

[0023] (1) Load sharing effect: Through the tight fit design of the intermediate bearing and the cooperation of the bearing inner ring preload assembly, the axial load is effectively distributed to the three bearings, avoiding the problem of local overload under single or double point support, and significantly improving the overall load-bearing capacity and service life of the system (L10 service life is doubled).

[0024] (2) Elimination of clearance: By applying preload to the three outer rings of the bearing through the bearing outer ring preload assembly, the clearance between the balls and raceways inside the bearing is effectively eliminated, reducing operating noise and improving the rotational accuracy and stability of the rotor.

[0025] (3) Impact resistance and adaptability: The unique "one tight and two loose" inner ring fit design, combined with the pre-compression component, gives the system good thermal expansion adaptability and axial impact resistance, ensuring reliable operation under complex working conditions. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the three-bearing preload-equalizing bearing system of this utility model;

[0028] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0029] in:

[0030] 1. Bearing sleeve; 1-1. Limiting boss;

[0031] 2. Rotation shaft;

[0032] 3. First bearing;

[0033] 4. Second bearing;

[0034] 5. Third bearing;

[0035] 6. Elastic preload component for bearing inner ring;

[0036] 7. Rigid support ring;

[0037] 8. Elastic preload component for the outer ring of the first bearing;

[0038] 9. Elastic preload component for the outer ring of the second bearing;

[0039] 10. Fan blade assembly;

[0040] 11. Outer shell;

[0041] 12. Stator assembly;

[0042] 13. Gasket. Detailed Implementation

[0043] The above solution will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrating the present invention and are not intended to limit the scope of the present invention. The implementation conditions used in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0044] like Figure 1 The diagram shown is a structural schematic of Embodiment 1 of this utility model, which provides a three-bearing preload load-equalizing bearing system, including a bearing sleeve 1, a rotating shaft 2 passing through the bearing sleeve 1, a bearing assembly installed in the bearing sleeve 1, a bearing inner ring preload assembly disposed on the outer periphery of the rotating shaft 2, and a bearing outer ring preload assembly disposed on the inner periphery of the bearing sleeve 1.

[0045] In this example, the three-bearing preload-equalizing bearing system is applied to a cooling fan, with the bearing sleeve 1 fixed to the cooling fan housing 11. The outer end of the rotating shaft 2 is fixedly connected to the fan blade assembly 10, and a limiting element, namely a limiting snap ring, is provided between the inner end and the bearing assembly.

[0046] A bearing assembly for supporting a rotating shaft 2 includes a first bearing 3, a second bearing 4, and a third bearing 5 arranged sequentially from the outside to the inside along the axial direction of the bearing sleeve 1. Preferably, the first bearing 3, the second bearing 4, and the third bearing 5 are ball bearings. The inner ring of the second bearing 4 is interference-fitted with the rotating shaft 2, while the inner rings of the first bearing 3 and the third bearing 5 are clearance-fitted with the rotating shaft 2 and positioned on it. A shim 13 is provided between the inner ring of the first bearing 3 and the fan blade assembly 10, and the fan blade assembly 10 positions the shim 13. The inner ring of the third bearing 5 is positioned by a retaining ring mounted at the end of the rotating shaft 2.

[0047] To facilitate the installation of the second bearing 4, a limiting boss 1-1 extending inward is provided on the inner wall of the bearing sleeve 1, and the outer ring of the second bearing 4 abuts against the limiting boss 1-1.

[0048] The bearing inner ring preload assembly includes a bearing inner ring elastic preload member 6 and a rigid support ring 7. The rigid support ring 7 is a stainless steel support ring and is disposed between the inner rings of the first bearing 3 and the second bearing 4 to fix the inner ring of the first bearing 3. The bearing inner ring elastic preload member 6 is a spring and is compressed and disposed between the inner rings of the second bearing 4 and the third bearing 5. The bearing inner ring elastic preload member 6 has a preload on the inner ring of the third bearing 5 to fix the inner ring of the third bearing 5.

[0049] The bearing outer ring preload assembly includes a first bearing outer ring elastic preload member 8 compressed between the outer rings of the first bearing 3 and the second bearing 4, and a second bearing outer ring elastic preload member 9 compressed between the outer ring of the third bearing 5 and the limiting boss 1-1. The first bearing outer ring elastic preload member 8 and the second bearing outer ring elastic preload member 9 are springs, which apply preload to the three bearing outer rings respectively, effectively eliminating the clearance between the balls and raceways inside the bearing.

[0050] Calculations and experiments have verified that the preload provided by the inner ring elastic preload component 6 is 1200 gf, and the preload provided by the first outer ring elastic preload component 8 and the second outer ring elastic preload component 9 is 500 gf, which can achieve the best load sharing and clearance elimination effect in this system.

[0051] Example 2

[0052] like Figure 2 As shown, everything else is the same as in Embodiment 1, except that the bearing inner ring preload assembly includes two bearing inner ring elastic preload members 6 disposed between the inner rings of the first bearing 3 and the second bearing 4 and between the inner rings of the second bearing 4 and the third bearing 5.

[0053] like Figure 1 As shown, this utility model also discloses a cooling fan, including the above-mentioned three-bearing preload-equalizing bearing system, and also including a housing 11 and a stator assembly 12 disposed between the bearing sleeve 1 and the fan blade assembly 10.

[0054] In summary, this bearing system can achieve load sharing among the three bearings, eliminate internal clearance in the bearings, and also enable the system to adapt to thermal expansion and resist axial impact, thereby improving operational reliability and service life.

[0055] The above examples are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A three-bearing preload-sharing bearing system, characterized in that, include: Bearing sleeve; A rotating shaft, which passes through the bearing sleeve; A bearing assembly, which is installed inside the bearing sleeve and is used to support the rotating shaft, includes a first bearing, a second bearing and a third bearing arranged sequentially from the outside to the inside along the axial direction of the bearing sleeve; A bearing inner ring preload assembly is disposed on the outer periphery of the rotating shaft and is used to apply force to the inner ring of the bearing assembly to fix the bearing inner ring. A bearing outer ring preload assembly, disposed on the inner circumference of the bearing sleeve, is used to apply force to the outer ring of the bearing assembly to eliminate clearance.

2. The three-bearing preload-sharing bearing system according to claim 1, characterized in that: The inner ring of the second bearing is interference-fitted with the rotating shaft, and the inner rings of the second and third bearings are clearance-fitted with the rotating shaft and are confined on the rotating shaft.

3. The three-bearing preload-sharing bearing system according to claim 2, characterized in that: The inner wall of the bearing sleeve is provided with a limiting boss extending inward, and the outer ring of the second bearing abuts against the limiting boss.

4. The three-bearing preload-equalizing bearing system according to claim 3, characterized in that: The bearing inner ring preload assembly includes an elastic preload member for the bearing inner ring that is compressed between the inner rings of the second bearing and the third bearing, and a rigid support ring disposed between the inner rings of the second bearing and the first bearing. Alternatively, the bearing inner ring preload assembly may include two bearing inner ring elastic preload members disposed between the inner rings of the first bearing and the second bearing, and disposed between the inner rings of the second bearing and the third bearing.

5. The three-bearing preload-sharing bearing system according to claim 4, characterized in that: The rigid support ring is a stainless steel support ring.

6. The three-bearing preload-equalizing bearing system according to claim 4, characterized in that: The inner ring elastic preload component of the bearing is a spring.

7. The three-bearing preload-equalizing bearing system according to claim 4, characterized in that: The bearing outer ring preload assembly includes a first bearing outer ring elastic preload member that is compressed between the outer rings of the first bearing and the second bearing, and a second bearing outer ring elastic preload member that is compressed between the outer ring of the third bearing and the limiting boss.

8. The three-bearing preload-equalizing bearing system according to claim 7, characterized in that: The first bearing outer ring elastic preload component and the second bearing outer ring elastic preload component are springs.

9. The three-bearing preload-sharing bearing system according to claim 1, characterized in that: The first bearing, the second bearing, and the third bearing are ball bearings.

10. A cooling fan, characterized in that: Includes the three-bearing preload-equalizing bearing system as described in any one of claims 1 to 9.

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