Bearing fixing structure and fan

Abstract

The utility model discloses a bearing fixing structure and fan, bearing fixing structure includes outer frame, pivot, upper ball bearing, lower ball bearing and first elastic part, and the outer frame center is equipped with the medium pipe, and the medium pipe is equipped with upper bearing mounting hole and lower bearing mounting hole in the position close to its upper and lower both ends, and the upper ball bearing is installed in the upper bearing mounting hole, and the lower ball bearing is installed in the lower bearing mounting hole, and the first elastic part is equipped between the upper ball bearing and lower ball bearing, and the pivot is worn in the upper ball bearing, first elastic part and lower ball bearing, and the inner ring of upper ball bearing and lower ball bearing is all with pivot fixed connection. Through the first elastic part of adding between the upper ball bearing and lower ball bearing, has promoted the normal pressure between the upper ball bearing, lower ball bearing and pivot, and then has increased the friction between the upper ball bearing, lower ball bearing and pivot, to be able to avoid the problem of relative movement because of the insufficient friction.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a bearing fixing structure and a fan. Background Technology

[0002] As the market develops, users have placed higher demands on fans, especially on fan speed. The reliability of fan bearings is one of the important factors affecting fan speed.

[0003] Currently, the mainstream ball bearing assembly structure in the fan industry is the ball bearing sliding assembly. When the fan is running at high speed, the friction between the inner ring of the ball bearing and the shaft is insufficient to support the traction force of the fan's high-speed rotation, resulting in relative movement between them. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a bearing fixing structure and fan, which aims to solve the problem of relative motion caused by insufficient friction between the ball bearing and the shaft when the fan rotates at high speed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: On one hand, this utility model provides a bearing fixing structure, including an outer frame, a rotating shaft, an upper ball bearing, a lower ball bearing, and a first elastic element. The outer frame has a central tube, and the central tube has an upper bearing mounting hole and a lower bearing mounting hole near its upper and lower ends. The upper ball bearing is installed in the upper bearing mounting hole, and the lower ball bearing is installed in the lower bearing mounting hole. The first elastic element is disposed between the upper ball bearing and the lower ball bearing. The rotating shaft passes through the upper ball bearing, the first elastic element, and the lower ball bearing, and the inner rings of the upper ball bearing and the lower ball bearing are fixedly connected to the rotating shaft.

[0006] Furthermore, the upper end of the first elastic element contacts the inner ring of the upper ball bearing, and the lower end of the first elastic element contacts the inner ring of the lower ball bearing.

[0007] Furthermore, the inner circumferential extension of the central tube is provided with an upper stepped portion, which contacts the outer ring of the upper ball bearing.

[0008] Furthermore, the inner circumferential extension of the central tube is provided with a lower step portion, which indirectly contacts the outer ring of the lower ball bearing.

[0009] Furthermore, a boss is provided inside the middle tube between the upper bearing mounting hole and the lower bearing mounting hole. The boss extends circumferentially along the inner wall of the middle tube. The upper end of the boss forms the upper step portion, and the lower end of the boss forms the lower step portion.

[0010] Furthermore, it also includes a second elastic member, which is provided between the lower step portion and the lower ball bearing.

[0011] Furthermore, the upper end of the second elastic element contacts the lower step portion, and the lower end of the second elastic element contacts the outer ring of the lower ball bearing.

[0012] Furthermore, both the first elastic element and the second elastic element are return springs.

[0013] Furthermore, the diameter of the inner hole of the second elastic element is larger than the outer diameter of the first elastic element, and the first elastic element passes through the inner hole of the second elastic element.

[0014] Secondly, this utility model also provides a fan, including fan blades, an iron core and the aforementioned bearing fixing structure, wherein the iron core is disposed around the middle tube and the upper end of the rotating shaft is connected to the fan blades.

[0015] The beneficial effects of this utility model compared with the prior art are as follows: A bearing fixing structure includes an outer frame, a rotating shaft, an upper ball bearing, a lower ball bearing, and a first elastic element. A central tube is provided at the center of the outer frame, and upper and lower bearing mounting holes are provided near the upper and lower ends of the central tube. The upper ball bearing is installed in the upper bearing mounting hole, and the lower ball bearing is installed in the lower bearing mounting hole. The first elastic element is located between the upper and lower ball bearings. The rotating shaft passes through the upper ball bearing, the first elastic element, and the lower ball bearing, and the inner rings of both the upper and lower ball bearings are fixedly connected to the rotating shaft. By adding a first elastic element between the upper and lower ball bearings, the normal pressure between the upper and lower ball bearings and the rotating shaft is increased, thereby increasing the friction between the upper and lower ball bearings and the rotating shaft, thus avoiding the problem of relative movement due to insufficient friction.

[0016] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objectives, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1A schematic diagram of the structure of a fan provided for a specific embodiment of this utility model; Figure 2 An exploded view of a fan provided for a specific embodiment of this utility model; Figure 3 A cross-sectional view of a fan provided for a specific embodiment of this utility model; Figure 4 This is a schematic diagram of the outer frame provided for a specific embodiment of the present utility model.

[0019] Figure Labels 1. Outer frame; 11. Middle tube; 111. Upper bearing mounting hole; 112. Upper step; 113. Lower step; 114. Boss; 2. Fan blade; 3. Upper ball bearing; 4. Lower ball bearing; 5. First elastic element; 6. Second elastic element; 7. Shaft. Detailed Implementation

[0020] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0026] like Figures 1 to 4As shown, this utility model embodiment provides a fan, including fan blades 2, an iron core, and a bearing fixing structure. The bearing fixing structure includes an outer frame 1, a rotating shaft 7, an upper ball bearing 3, a lower ball bearing 4, and a first elastic element 5. A central tube 11 is provided at the center of the outer frame 1. The central tube 11 has a cylindrical hollow structure to ensure structural strength and reduce overall weight. An upper bearing mounting hole 111 and a lower bearing mounting hole are respectively machined near the upper and lower ends of the central tube 11. Both mounting holes are cylindrical through holes and are coaxially arranged to avoid radial runout after subsequent assembly. The upper bearing mounting hole 111 is adapted to the outer ring of the upper ball bearing 3, and the lower bearing mounting hole is adapted to the outer ring of the lower ball bearing 4, ensuring that the upper ball bearing 3 and the lower ball bearing 4 will not experience radial movement after installation. The first elastic element 5 is disposed between the upper ball bearing 3 and the lower ball bearing 4. The first elastic element 5 is in a pre-compressed state, with its upper end in close contact with the lower end face of the inner ring of the upper ball bearing 3 and its lower end in close contact with the upper end face of the inner ring of the lower ball bearing 4. Through the elastic force generated by the pre-compression, a downward pressure can be continuously applied to the inner ring of the upper ball bearing 3 and an upward pressure can be applied to the inner ring of the lower ball bearing 4, thereby increasing the positive pressure between the inner rings of the two bearings and the rotating shaft 7. The rotating shaft 7 passes through the inner ring of the upper ball bearing 3, the inner hole of the first elastic element 5, and the inner ring of the lower ball bearing 4 from top to bottom, realizing the fixed connection between the inner rings of the upper ball bearing 3 and the inner rings of the lower ball bearing 4 and the rotating shaft 7. The part of the upper end of the rotating shaft 7 that extends out of the upper ball bearing 3 is provided with a structure for connecting the fan blade 2, which, together with the locking element, fixes the fan blade 2 and prevents the fan blade 2 from moving axially.

[0027] By setting a first elastic element 5 in a pre-compressed state between the upper ball bearing 3 and the lower ball bearing 4, the preload of the first elastic element 5 continuously increases the normal force between the inner rings of the upper ball bearing 3 and the lower ball bearing 4 and the rotating shaft 7. According to the friction formula F=μN, where μ is the coefficient of friction and N is the normal force, under the condition that the coefficient of friction remains unchanged, the increase in normal force directly increases the friction between the inner rings of the upper ball bearing 3 and the lower ball bearing 4 and the rotating shaft 7. This effectively avoids the problem of relative sliding between the inner rings of the upper ball bearing 3 and the lower ball bearing 4 and the rotating shaft 7 caused by the increase in the fit clearance and insufficient friction after long-term use, thus ensuring the stability of power transmission.

[0028] In some embodiments, the hollow inner wall of the middle tube 11 is provided with an upper step portion 112 extending circumferentially. The upper step portion 112 is located inside the middle tube 11 near the upper bearing mounting hole 111. Its radial protrusion height is based on the principle of forming a stable contact with the outer ring of the upper ball bearing 3. The upper end face of the upper step portion 112 is flush with the lower end edge of the upper bearing mounting hole 111. When the upper ball bearing 3 is installed in the upper bearing mounting hole 111, the lower end face of the outer ring of the upper ball bearing 3 will fit tightly with the lower end face of the upper step portion 112. In this way, the upper step portion 112 can form an axial limit for the upper ball bearing 3 in the upper bearing mounting hole 111, preventing the upper ball bearing 3 from moving downward due to axial force during fan operation. At the same time, the force on the outer ring of the upper ball bearing 3 is evenly distributed through the annular contact surface, avoiding local stress concentration that could cause deformation of the outer ring of the upper ball bearing 3 or damage to the inner wall of the middle tube 11.

[0029] The hollow inner wall of the central tube 11 extends circumferentially with a lower step portion 113, which is located inside the central tube 11 near the lower bearing mounting hole. Its structural form is the same as that of the upper step portion 112, but its contact with the lower ball bearing 4 is indirect. That is, the lower step portion 113 and the outer ring of the lower ball bearing 4 are not directly attached, but the force is transmitted through a pre-set intermediate structure. The lower step portion 113 indirectly limits the axial movement of the lower ball bearing 4 through the indirect contact with the outer ring of the lower ball bearing 4 via the intermediate structure, effectively preventing the lower ball bearing 4 from moving upward due to the axial force generated by the high-speed rotation of the shaft 7 during fan operation.

[0030] In such Figure 3 In the illustrated embodiment, a boss 114 is provided inside the middle tube 11 between the upper bearing mounting hole 111 and the lower bearing mounting hole. The boss 114 extends circumferentially along the inner wall of the middle tube 11. The upper end of the boss 114 forms an upper step portion 112, and the lower end of the boss 114 forms a lower step portion 113. This design, by using a single boss 114 to simultaneously form the upper step portion 112 and the lower step portion 113, reduces the structural complexity inside the middle tube 11 compared to the design of two independent step portions.

[0031] In the embodiment shown in the attached drawings, the bearing fixing structure further includes a second elastic member 6, which has a lower stepped portion 113 between it and the lower ball bearing 4. That is, the upper end face of the second elastic member 6 is in close contact with the lower stepped portion 113, and the lower end face is in close contact with the upper end face of the outer ring of the lower ball bearing 4, and the three are coaxially arranged to ensure that the preload of the second elastic member 6 can be uniformly transmitted axially to the outer ring of the lower ball bearing 4. In this way, the second elastic member 6 applies a continuous axial preload to the lower ball bearing 4 through pre-compression.

[0032] Understandably, the lower end of the rotating shaft 7 is provided with a retaining ring, and the upper end face of the retaining ring abuts against the inner ring of the lower ball bearing 4. Thus, under the action of the second elastic element 6, the lower ball bearing 4 will be in a continuous preload state.

[0033] In the embodiment shown in the attached drawings, both the first elastic element 5 and the second elastic element 6 are return springs, which have a long service life and are easy to install.

[0034] In some embodiments, the diameter of the inner hole of the second elastic member 6 is larger than the outer diameter of the first elastic member 5, and the first elastic member 5 passes through the inner hole of the second elastic member 6.

[0035] Since the second elastic element 6 is located between the lower step portion 113 and the outer ring of the lower ball bearing 4, and the first elastic element 5 is located between the inner ring of the upper ball bearing 3 and the inner ring of the lower ball bearing 4, with the lower end of the first elastic element 5 contacting the inner ring of the lower ball bearing 4, when the first elastic element 5 passes through the inner hole of the second elastic element 6, the two form a coaxial nested structure. That is, the first elastic element 5 is located inside the second elastic element 6, collinearly arranged along the axial direction of the middle tube 11, and both are coaxial with the middle tube 11 and the rotating shaft 7. This design allows two elastic elements to be accommodated simultaneously within the limited internal space of the middle tube 11, reducing space occupation and thus facilitating the miniaturization design of the fan.

[0036] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A bearing fixing structure, characterized in that, The device includes an outer frame, a rotating shaft, an upper ball bearing, a lower ball bearing, and a first elastic element. The outer frame has a central tube at its center. The central tube has an upper bearing mounting hole and a lower bearing mounting hole near its upper and lower ends. The upper ball bearing is installed in the upper bearing mounting hole, and the lower ball bearing is installed in the lower bearing mounting hole. The first elastic element is located between the upper ball bearing and the lower ball bearing. The rotating shaft passes through the upper ball bearing, the first elastic element, and the lower ball bearing, and the inner rings of the upper ball bearing and the lower ball bearing are fixedly connected to the rotating shaft.

2. The bearing fixing structure according to claim 1, characterized in that, The upper end of the first elastic element contacts the inner ring of the upper ball bearing, and the lower end of the first elastic element contacts the inner ring of the lower ball bearing.

3. The bearing fixing structure according to claim 1, characterized in that, The inner circumferential extension of the central tube is provided with an upper stepped portion, which contacts the outer ring of the upper ball bearing.

4. The bearing fixing structure according to claim 3, characterized in that, The inner circumferential extension of the central tube is provided with a lower step portion, which indirectly contacts the outer ring of the lower ball bearing.

5. The bearing fixing structure according to claim 4, characterized in that, Inside the middle tube, a boss is provided between the upper bearing mounting hole and the lower bearing mounting hole. The boss extends circumferentially along the inner wall of the middle tube. The upper end of the boss forms the upper step portion, and the lower end of the boss forms the lower step portion.

6. The bearing fixing structure according to claim 4, characterized in that, It also includes a second elastic element, which is provided between the lower step portion and the lower ball bearing.

7. A bearing fixing structure according to claim 6, characterized in that, The upper end of the second elastic element contacts the lower step portion, and the lower end of the second elastic element contacts the outer ring of the lower ball bearing.

8. A bearing fixing structure according to claim 6, characterized in that, Both the first elastic element and the second elastic element are return springs.

9. A bearing fixing structure according to claim 8, characterized in that, The diameter of the inner hole of the second elastic element is larger than the outer diameter of the first elastic element, and the first elastic element passes through the inner hole of the second elastic element.

10. A fan, characterized in that, The device includes a fan blade, an iron core, and a bearing fixing structure as described in any one of claims 1-9, wherein the iron core is disposed around the periphery of the central tube, and the upper end of the rotating shaft is connected to the fan blade.

Images