Shaft sleeve assembly

Abstract

The utility model relates to the technical field of fan parts, in particular to a shaft sleeve assembly. The utility model provides a shaft sleeve assembly. According to the technical scheme, the shaft sleeve assembly comprises a rigid mandrel sleeve, a rigid outer ring body and a rubber layer integrally formed between the rigid mandrel sleeve and the rigid outer ring body in an injection molding mode. A shaft hole used for being connected with a motor shaft is formed in the center of the rigid mandrel sleeve, and an annular sawtooth edge is constructed on the outer side wall of the rigid mandrel sleeve. A plurality of protrusions are regularly arranged on the inner side wall of the rigid outer ring body in the circumferential direction. And the annular sawtooth edge of the rigid mandrel sleeve and the bulge of the rigid outer ring body are embedded into the rubber layer. The scheme has the advantages of simplicity and convenience in installation, high tensile strength and torsion strength and good damping effect.

Description

Technical Field

[0001] This application relates to the field of fan component technology, and more specifically, to a bushing assembly. Background Technology

[0002] The rubber bushing is a core component of the fan, serving as the base for the motor rotor. Its working principle is as follows: after the DC motor starts, the torque is transmitted through the rubber bushing, causing the fan blades to rotate and thus delivering airflow. The rubber bushing consists of an inner aluminum alloy component fixed to the motor shaft, an outer aluminum alloy component connecting the fan blades, and an elastic rubber assembly. When the motor drives the fan, the fan shaft system is subjected to both the driving force from the motor shaft and the resistance generated by the fan blades. Utilizing the excellent damping properties of rubber, the rubber bushing not only transmits torque but also absorbs the vibration energy caused by these forces, providing cushioning and vibration reduction, ensuring smooth and noiseless fan operation.

[0003] Existing rubber bushings can be referenced from the fan shaft vibration isolation rubber bushing described in Chinese utility model patent "CN218644507U". This bushing includes an inner bushing layer, a vibration isolation rubber body, and an outer bushing layer, all coaxially arranged from the inside out. A through-hole for housing the inner bushing layer is axially oriented through the center of the vibration isolation rubber body. An annular groove is recessed axially on the end faces of the vibration isolation rubber body around the through-hole, with the bottom and side walls of the groove being arc-shaped. However, this design has some drawbacks. First, the installation process is relatively complex. The outer bushing layer needs to be fixed to the fan shaft hole via injection molding, the inner bushing layer is fixedly connected to the motor shaft, and the vibration isolation rubber body needs to be embedded within the outer bushing layer, with the inner bushing layer positioned within the through-hole of the vibration isolation rubber body. This multi-step installation method is not only time-consuming but also prone to installation errors. Second, the tensile and torsional strength of this design cannot meet practical requirements. Because the connection between the components is relatively simple, loosening or deformation can easily occur during long-term use, affecting overall performance. Finally, due to limitations in the structural design, the vibration damping effect of this bushing is not ideal. When the fan operates at high speed, vibration problems easily occur, affecting the overall operational stability and lifespan of the fan. To address these issues, the existing technology urgently needs improvement. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a bushing assembly that offers advantages such as easy installation, high tensile and torsional strength, and good shock absorption.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This application provides a bushing assembly with the following technical solution: it includes a rigid mandrel, a rigid outer ring, and a rubber layer integrally injection molded between the rigid mandrel and the rigid outer ring; the rigid mandrel has a shaft hole at its center for connecting a motor shaft, and the outer sidewall of the rigid mandrel has an annular serrated edge; the inner sidewall of the rigid outer ring has multiple protrusions arranged regularly in the circumferential direction; the annular serrated edge of the rigid mandrel and the protrusions of the rigid outer ring are embedded in the rubber layer.

[0007] Furthermore, this application also proposes that the two axial end faces of the rubber layer are both lower than the two axial end faces of the rigid mandrel sleeve and the rigid outer ring body; a positioning groove for gripping and positioning is constructed on the first axial end face of the rubber layer, and the positioning groove is regularly arranged along the circumference of the rigid mandrel sleeve.

[0008] Furthermore, this application also proposes that a plurality of arc-shaped grooves are provided on the first axial end face of the rubber layer, and the plurality of arc-shaped grooves and a plurality of positioning grooves are arranged alternately in the circumferential direction.

[0009] Furthermore, this application also proposes that a plurality of arc-shaped ribs are constructed on the second axial end face of the rubber layer, and the plurality of arc-shaped ribs correspond axially to a plurality of arc-shaped grooves.

[0010] Furthermore, this application also proposes that a plurality of insertion holes are provided on the second axial end face of the rubber layer, and the insertion holes are constructed as blind holes.

[0011] Furthermore, this application also proposes that the extended portions at both ends of the rigid mandrel sleeve and the rigid outer ring body are injection molded with rubber layers.

[0012] Furthermore, this application also proposes that multiple axial grooves are constructed on the outer side wall of the rigid outer ring body, and the axial grooves on the outer side of the rigid outer ring body are radially opposite to and shape-matched with the protrusions on its inner side, in order to ensure that the thickness of the rigid outer ring body is basically consistent.

[0013] Furthermore, this application also proposes that multiple circumferential grooves are constructed on the outer side wall of the rigid outer ring body, and the multiple circumferential grooves intersect with multiple axial grooves.

[0014] As described above, the bushing assembly provided in this application includes a rigid mandrel, a rigid outer ring, and a rubber layer integrally injection-molded between the rigid mandrel and the rigid outer ring. The outer wall of the rigid mandrel has an annular serrated edge, and the inner wall of the rigid outer ring has multiple protrusions arranged regularly in a circumferential direction. The annular serrated edge of the rigid mandrel and the protrusions of the rigid outer ring are embedded in the rubber layer. This structural design, through integral injection molding and embedded connection, simplifies the installation process, improves the connection strength between components, and enhances the overall vibration damping effect. It has the advantages of easy installation, high tensile and torsional strength, and good vibration damping effect. Attached Figure Description

[0015] Figure 1 A three-dimensional perspective view of the second end face of the bushing assembly provided in this application.

[0016] Figure 2 This is a three-dimensional view of the first end face of the bushing assembly provided in this application.

[0017] Figure 3 This is a cross-sectional schematic diagram of the bushing assembly provided in this application. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0019] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] like Figures 1-3 As shown, this embodiment proposes a bushing assembly, including a rigid mandrel sleeve 1, a rigid outer ring body 2, and a rubber layer 3 integrally injection-molded between the rigid mandrel sleeve 1 and the rigid outer ring body 2. The rigid mandrel sleeve 1 has a shaft hole at its center for connecting to a motor shaft, and an annular serrated edge 11 is formed on the outer sidewall of the rigid mandrel sleeve 1. Multiple protrusions 21 are regularly arranged circumferentially on the inner sidewall of the rigid outer ring body 2. The annular serrated edge 11 of the rigid mandrel sleeve 1 and the protrusions 21 of the rigid outer ring body 2 are embedded in the rubber layer 3. This structural design allows the rubber layer 3 to effectively transmit torque and absorb vibration, thereby reducing the impact of vibration on the system. Furthermore, the rigid mandrel sleeve 1 has a shaft hole 12 at its center for connecting to a motor shaft. This design allows the bushing to be tightly connected to the motor shaft, ensuring efficient torque transmission. In a preferred embodiment, the inner sidewall of the rigid outer ring 2 has a plurality of protrusions 21 arranged regularly in the circumferential direction. These protrusions 21 cooperate with the annular serrated edge 11 of the rigid mandrel sleeve 1 to enhance the fixing effect of the rubber layer 3 and improve the overall strength of the sleeve.

[0024] Specifically, the integrated injection molding design of the rubber layer 3 not only simplifies the manufacturing process but also improves the durability and stability of the bushing. The structural design of the rigid core bushing 1 and the rigid outer ring 2 enables the bushing to remain stable under torque and vibration, thus solving the problem of insufficient tensile and torsional strength of bushings in the prior art. Therefore, the bushing assembly of this application can effectively absorb vibration while ensuring torque transmission efficiency, ensuring smooth and noiseless fan operation. Compared with the prior art, the bushing assembly of this application, through optimized structural design, improves the tensile and torsional strength of the bushing, solving the problem of bushing vibration in the prior art. Furthermore, the bushing assembly of this application is easier to install and provides better vibration damping, thereby improving the overall performance of the fan.

[0025] like Figure 1 and2 In a further embodiment, this application proposes that the axial end faces of the rubber layer 3 are lower than the axial end faces of the rigid mandrel sleeve 1 and the rigid outer ring 2; a plurality of positioning grooves 31 for gripping and positioning are constructed on the first axial end face of the rubber layer 3, and the plurality of positioning grooves 31 are regularly arranged circumferentially along the rigid mandrel sleeve 1. The fact that the axial end faces of the rubber layer 3 are lower than the axial end faces of the rigid mandrel sleeve 1 and the rigid outer ring 2 reduces the contact area between the rubber layer 3 and the external environment, thereby reducing friction and wear and extending service life. Furthermore, the plurality of positioning grooves 31 constructed on the first axial end face of the rubber layer 3, which are regularly arranged circumferentially along the rigid mandrel sleeve 1, can provide precise positioning function and ensure the stability of the bushing assembly during installation and use. As a preferred embodiment, the shape of the positioning grooves 31 can be rectangular, trapezoidal, or other geometric shapes to adapt to different gripping and positioning requirements. In addition, the depth and width of the positioning grooves 31 can be adjusted according to the load and vibration conditions in actual applications to achieve the best positioning effect. Therefore, this application solves the problems of inaccurate positioning, cumbersome installation, and poor shock absorption in the prior art by constructing multiple positioning grooves 31 on the first axial end face of the rubber layer 3. Specifically, this design not only improves the installation efficiency of the bushing assembly but also enhances its stability and durability during operation.

[0026] Furthermore, this application proposes that multiple arc-shaped grooves 32 are provided on the first axial end face of the rubber layer 3, with the multiple arc-shaped grooves 32 and multiple positioning grooves 31 arranged alternately in the circumferential direction. Specifically, the arc-shaped grooves 32 can increase the flexibility and elasticity of the rubber layer 3, thereby better absorbing vibration and impact forces when transmitting torque. As a preferred embodiment, the shape of the arc-shaped grooves 32 can be semi-circular or V-shaped to ensure good buffering effect under force in different directions. Furthermore, the depth and width of the arc-shaped grooves 32 can be adjusted according to the torque and vibration intensity in actual applications to achieve the best vibration reduction effect. Thus, by providing multiple arc-shaped grooves 32 on the first axial end face of the rubber layer 3 and circumferentially alternating with the positioning grooves 31, the vibration reduction performance and positioning accuracy of the rubber layer 3 can be effectively improved. Compared with the prior art, the technical solution of this application not only improves the tensile strength and torsional strength of the rubber bushing, but also solves the problems of poor vibration reduction effect and easy vibration in the prior art. Specifically, the combination of the arc groove 32 and the positioning groove 31 enables the rubber layer 3 to better absorb and disperse the force when transmitting torque, thereby ensuring the smooth operation and quiet operation of the fan.

[0027] Furthermore, this application proposes that multiple arc-shaped ribs 33 are constructed on the second axial end face of the rubber layer 3, with the multiple arc-shaped ribs 33 corresponding axially to multiple arc-shaped grooves 32. Specifically, the arrangement of the arc-shaped ribs 33 can increase the rigidity and stability of the rubber layer 3, enabling the rubber layer 3 to better transmit torque when subjected to torque, reducing vibration and noise caused by uneven torque transmission. The axial correspondence between the arc-shaped ribs 33 and the arc-shaped grooves 32 ensures the balance of mechanical properties of the rubber layer 3 in the axial and radial directions, thereby improving the overall performance of the bushing assembly. As a preferred embodiment, the arc-shaped ribs 33 can be injection molded, and their shape and size can be adjusted according to actual application requirements to adapt to different torque and vibration absorption requirements. Thus, by setting arc-shaped ribs 33 on the second axial end face of the rubber layer 3, the technical solution of this application effectively solves the problem of insufficient tensile strength and torsional strength of rubber bushings in the prior art, improves the shock absorption effect of the product, reduces vibration, and ensures the smoothness and quietness of fan operation.

[0028] Furthermore, this application proposes that a plurality of insertion holes 34 are provided on the second axial end face of the rubber layer 3, and the insertion holes 34 are constructed as blind holes. Specifically, the insertion holes 34 can be configured in various ways. For example, the insertion holes 34 can be formed by injection molding, wherein the injection molding material can be a rubber material with good elasticity and wear resistance. Furthermore, the shape of the insertion holes 34 can be cylindrical, conical, or other geometric shapes to adapt to different assembly requirements. As a preferred embodiment, the diameter and depth of the insertion holes 34 can be adjusted according to the assembly requirements in actual applications to ensure that the insertion holes 34 can effectively fix and position the relevant components. Thus, by providing a plurality of insertion holes 34 on the second axial end face of the rubber layer 3 and constructing them as blind holes, the fixation and stability of the rubber layer 3 can be effectively enhanced, thereby improving the assembly accuracy and service life of the entire bushing assembly. Compared with the prior art, the technical solution of this application not only simplifies the assembly process, but also improves the tensile strength and torsional strength of the product, and solves the technical problems of poor vibration damping and easy vibration in the prior art.

[0029] Furthermore, this application proposes that rubber layers 3 be injection-molded onto the axially extending portions of both the rigid mandrel sleeve 1 and the rigid outer ring 2. The injection molding of rubber layers 3 onto the axially extending portions of the rigid mandrel sleeve 1 and the rigid outer ring 2 increases the sealing and vibration damping effect of the bushing assembly. Specifically, the injection molding of rubber layers 3 allows for a tight bond between the extending portions of the rigid mandrel sleeve 1 and the rigid outer ring 2 and the rubber layers 3, thereby effectively absorbing and dispersing vibrations and impacts from the motor shaft and the outer ring body during operation, improving the stability and service life of the bushing assembly.

[0030] In a preferred embodiment, the rubber layer 3 can be injection molded using a thermoplastic elastomer material, which possesses good elasticity and wear resistance, and can maintain stable performance under high temperature and high pressure environments. Furthermore, the thickness of the rubber layer 3 can be adjusted according to actual application requirements to achieve optimal shock absorption and sealing effects. Therefore, the technical solution of this application, by injection molding the rubber layer 3 onto the axially extended portions of the rigid mandrel sleeve 1 and the rigid outer ring 2, solves the problem of poor shock absorption and easy vibration in existing bushing assemblies, improving the stability and service life of the bushing assembly.

[0031] like Figure 1 and 2 As shown, this application also proposes constructing multiple axial grooves 22 on the outer wall of the rigid outer ring 2. The axial grooves 22 on the outer side of the rigid outer ring 2 are radially opposite to and shape-matched with the protrusions 21 on the inner side, which is used to ensure that the thickness of the rigid outer ring 2 is basically consistent. Specifically, the multiple axial grooves 22 constructed on the outer wall of the rigid outer ring 2, which are radially opposite to and shape-matched with the protrusions 21 on the inner side, can effectively ensure that the thickness of the rigid outer ring 2 is basically consistent at different positions. This design helps to improve the overall stability and durability of the bushing assembly, especially when subjected to axial and radial loads, and can reduce stress concentration problems caused by uneven thickness. As a preferred embodiment, the depth and width of the axial grooves 22 can be optimized according to the load and stress distribution in the actual application. For example, in areas subjected to large axial loads, the depth of the grooves can be appropriately increased to enhance the strength and rigidity of the area; while in areas subjected to small loads, the depth of the grooves can be appropriately reduced to reduce weight and material costs. Therefore, by constructing multiple axial grooves 22 on the outer wall of the rigid outer ring 2, which are radially opposite and shape-matched to the inner protrusions 21, the technical solution of this application can effectively solve the problem of uneven thickness of the rigid outer ring 2, thereby improving the overall performance and service life of the bushing assembly. Compared with the prior art, the technical solution of this application can optimize the use of materials and reduce production costs while ensuring structural strength, thus possessing significant technical advantages.

[0032] Furthermore, this application proposes that multiple circumferential grooves 23 be constructed on the outer wall of the rigid outer ring 2, and these multiple circumferential grooves 23 intersect with multiple axial grooves 22. Specifically, the circumferential grooves 23 constructed on the outer wall of the rigid outer ring 2 can intersect with the axial grooves 22 to form a complex groove structure. This structure can increase the surface friction of the rigid outer ring 2, thereby improving its bonding strength with the rubber layer 3. In addition, the circumferential grooves 23 can also improve the stress distribution of the rigid outer ring 2, reducing deformation or damage caused by stress concentration. As a preferred embodiment, the shape of the circumferential grooves 23 can be arc-shaped or V-shaped, and their depth and width can be adjusted according to actual application requirements. Thus, by constructing multiple circumferential grooves 23 on the outer wall of the rigid outer ring 2 and having them intersect with the axial grooves 22, the overall strength and stability of the bushing assembly can be effectively improved, while also improving its bonding effect with the rubber layer 3. Compared with the prior art, the technical solution of this application can better solve the problems of insufficient strength and loose connection that may occur in the bushing assembly in practical applications, thereby improving the service life and performance of the product.

[0033] In summary, this application addresses the problems of insufficient tensile and torsional strength in existing bushing assemblies, leading to poor vibration damping and easy vibration, by optimizing the design of the rubber layer 3. The addition of features such as the positioning groove 31, arc-shaped groove 32, arc-shaped rib 33, and insertion hole 34 improves the stability and functionality of the bushing assembly, enabling it to better transmit torque, absorb vibration, and ensure smooth, noiseless fan operation in practical applications.

[0034] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0035] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A bushing assembly, characterized in that: It includes a rigid mandrel sleeve (1), a rigid outer ring body (2), and a rubber layer (3) integrally injection molded between the rigid mandrel sleeve (1) and the rigid outer ring body (2); the rigid mandrel sleeve (1) is provided with a shaft hole (12) for connecting the motor shaft at its center, and an annular serrated edge (11) is constructed on the outer side wall of the rigid mandrel sleeve (1); multiple protrusions (21) are regularly arranged circumferentially on the inner side wall of the rigid outer ring body (2); the annular serrated edge (11) of the rigid mandrel sleeve (1) and the protrusions (21) of the rigid outer ring body (2) are embedded in the rubber layer (3); The two axial end faces of the rubber layer (3) are both lower than the two axial end faces of the rigid mandrel sleeve (1) and the rigid outer ring (2); a plurality of positioning grooves (31) for gripping and positioning are constructed on the first axial end face of the rubber layer (3), and the plurality of positioning grooves (31) are regularly arranged along the circumference of the rigid mandrel sleeve (1). The first axial end face of the rubber layer (3) is also provided with multiple arc-shaped grooves (32), and multiple arc-shaped grooves (32) and multiple positioning grooves (31) are arranged alternately in the circumferential direction; Multiple arc-shaped ribs (33) are constructed on the second axial end face of the rubber layer (3), and the multiple arc-shaped ribs (33) correspond axially to the multiple arc-shaped grooves (32); Multiple axial grooves (22) are constructed on the outer side wall of the rigid outer ring (2). The axial grooves (22) on the outer side of the rigid outer ring (2) are radially opposite to and shape-matched with the protrusions (21) on the inner side, in order to ensure that the thickness of the rigid outer ring (2) is basically consistent.

2. The bushing assembly according to claim 1, characterized in that: The second axial end face of the rubber layer (3) is also provided with a plurality of insertion holes (34), which are constructed as blind holes.

3. A bushing assembly according to claim 1, characterized in that: The rigid mandrel sleeve (1) and the rigid outer ring (2) are both injection molded with rubber layers (3) on the axial ends of the extended portions.

4. A bushing assembly according to claim 1, characterized in that: The outer wall of the rigid outer ring (2) has multiple circumferential grooves (23) which intersect with multiple axial grooves (22).

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