A bushing assembly

Abstract

This utility model relates to the field of mechanical transmission connection components, and more particularly to a bushing assembly. The technical solution is as follows: it includes a disc body, a bushing disposed at the center of the disc body, and a colloid that connects the inner edge of the disc body and the outer edge of the bushing body together by injection molding. The disc body comprises an inner ring body covered by the colloid injection molding, and multiple flange portions disposed radially outside the inner ring body. The multiple flange portions are regularly spaced along the circumference of the inner ring body, with a notch formed between adjacent flange portions. A through hole is provided in the center of each flange portion, and a raised ring protruding towards one axial direction is provided at the edge of the through hole. Flip plates protruding on the same side as the raised ring are provided on both circumferential sides of the flange portions. The raised ring and flip plates are used for riveting connection with a metal flow disc body. This solution has the advantages of improving the bonding strength between the metal component and the injection-molded colloid, achieving a direct and reliable connection with an external metal flow disc body without the need for additional fasteners.

Description

Technical Field

[0001] This utility model relates to the field of mechanical transmission connection components, and in particular to a bushing assembly. Background Technology

[0002] As a core connecting component in a mechanical transmission system, the performance of bushing assemblies directly affects the operational reliability and transmission efficiency of equipment such as motors, fans, and pumps. In existing technologies, bushing assemblies are manufactured using two main methods: one is integral metal casting or machining, which, while providing high structural strength, suffers from drawbacks such as heavy weight, poor vibration damping, and high processing costs; the other is a split metal structure connected by welding or bolts. While this method solves some problems related to connecting dissimilar materials, welding is prone to thermal deformation and residual stress, while bolt connections increase the number of parts and assembly complexity.

[0003] Metal-plastic composite bushing assemblies, which have emerged in recent years, combine metal inserts with engineering plastics through injection molding, thus improving upon the shortcomings of traditional structures to some extent. However, these composite structures still face two key technical challenges in practical applications: First, the bonding strength between the metal components and the injection-molded plastic is insufficient, especially under high torque or alternating loads, which can easily lead to stress concentration at the interface and connection failure. Second, the connection to the external metal flow plate still relies on additional fasteners, which not only increases assembly steps but may also lead to loosening under long-term vibration conditions.

[0004] More specific technical problems include: the interface between the metal disc and the injection-molded material lacks an effective mechanical interlocking structure, and relying solely on the adhesive force between the materials is insufficient to meet the requirements of high-load conditions; simultaneously, existing structures cannot fully utilize the characteristics of the metal disc itself to achieve a direct and reliable connection with external components, resulting in overall structural redundancy and low assembly efficiency. Furthermore, for the connection between the bushing and the disc, existing technologies often neglect the optimized design of the injection-molded material flow channel, affecting injection molding quality and bonding strength.

[0005] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0006] To address the aforementioned problems, the present invention aims to provide a bushing assembly that improves the bonding strength between the metal components and the injection-molded colloid, enables direct and reliable connection with the external metal flow plate without the need for additional fasteners.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This application provides a bushing assembly, the technical solution of which is as follows: A bushing assembly includes a disc body, a bushing disposed at the center of the disc body, and a colloid that connects the inner edge of the disc body and the outer edge of the bushing body together by injection molding; characterized in that: the disc body includes an inner ring body covered by the colloid injection molding, and a plurality of flange portions disposed on the radially outer side of the inner ring body; the plurality of flange portions are regularly arranged at intervals along the circumference of the inner ring body, and a notch is formed between two adjacent flange portions; a through hole is provided in the middle of the flange portion, and a convex ring is provided at the edge of the through hole protruding towards one side of the axial direction, and flaps protruding on the same side as the convex ring are provided on both circumferential sides of the flange portion; the convex ring and flaps are used for riveting connection with the metal through-flow disc body.

[0009] Furthermore, this application also proposes that the protrusion direction of the convex ring and the flap is consistent with the direction of the side of the bushing exposed on the colloid.

[0010] Furthermore, this application also proposes that the inner ring body is provided with multiple flow channels in the circumferential direction, and the flow channels extend through both sides of the inner ring body for the flow of injection-molded material.

[0011] Furthermore, this application also proposes that the outer edge of the inner ring body is provided with a bent portion, and the flange portion is connected to the outside of the bent portion, so that the inner ring body and the flange portion are at different axial heights; both the inner ring body and the bent portion are covered by the colloid body.

[0012] Furthermore, this application also proposes that the upper surface of the colloid is flush with the upper surface of the flange.

[0013] Furthermore, this application also proposes that the outer side wall of the bushing is provided with an annular injection groove in the circumferential direction, and the inner edge of the colloid is injection molded into the annular injection groove.

[0014] Furthermore, this application also proposes that an annular groove be provided on the lower end face where the colloid connects with the disc body and the bushing.

[0015] Furthermore, this application also proposes that the inner wall of the central hole of the bushing has a cross-section, so that the cross-section of the central hole is "D" shaped; and the side wall of the bushing has bolt holes that communicate with the central hole.

[0016] As can be seen from the above, the bushing assembly and its connection structure provided in this application solve the problems of insufficient bonding strength between metal and colloid and reliance on additional fasteners by providing a flange portion with a convex ring and a flap plate in the radial direction of the inner ring body, forming a mechanical interlocking structure by using injection-molded colloid, and directly riveting it to the metal flow plate body through the convex ring and flap plate. It has the advantages of improving connection reliability and simplifying the assembly process. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of a bushing assembly provided in this application.

[0018] Figure 2This is a top view of a bushing assembly provided in this application.

[0019] Figure 3 This is a cross-sectional schematic diagram of a bushing assembly provided in this application.

[0020] Figure 4 A schematic diagram of the disk structure provided in this application. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] In existing technologies, metal bushing assemblies are generally connected by welding or screws, which poses risks of thermal deformation and structural complexity. Although injection molding combines the advantages of metal and plastic, the bonding strength between the metal insert and the plastic is insufficient, and the connection to the external disc still relies on additional fasteners such as bolts. For example, in the assembly of motor impellers, traditional bushing assemblies are prone to stress concentration due to the single connection point, and are susceptible to loosening or detachment under long-term vibration.

[0027] To address these issues, the research and development process revealed that weak bonding between the metal insert and the colloid interface was the primary cause of failure, necessitating an increase in the mechanical interlocking area through structural design. Simultaneously, redundancy in the external connection structure led to low assembly efficiency, requiring the development of an integrated riveting solution. After numerous tests, the split-type disc structure proved to ensure both the strength of the colloid coating and an independent load-bearing area for riveting. By decomposing the disc into an inner ring and a flange, physical isolation is achieved between the colloid-coated area and the mechanical connection area, effectively preventing stress transmission.

[0028] like Figure 1-4As shown, this application proposes a bushing assembly including a disc body 1, a bushing 2, and a colloid 3. The disc body 1 consists of an inner ring body 4 and multiple flanges 5. The flanges 5 are arranged circumferentially to form notches, and a through hole 6 with a raised ring 7 is provided in the center. Flip plates 8 are provided on both sides circumferentially. The colloid 3 connects the inner ring body 4 to the bushing 2 by injection molding. The raised ring 7 and the flip plates 8 are used for riveting to the metal through-flow disc body. The inner ring body 4 refers to the annular metal substrate completely covered by the colloid 3. Specifically, it can be made of low carbon steel plate formed by stamping. Its function is to provide a large-area covering interface for the colloid 3. The flanges 5 refer to the connecting structures located on the radially outer side of the inner ring body 4. Specifically, they can be integrally formed with the inner ring body 4 by stamping. Each flange 5 forms an independent riveting point. The notch refers to the space between adjacent flanges 5. The specific width can be one-third to one-half of the circumferential length of the flange 5. It is used to isolate the stress field of each riveting point. The through hole 6 refers to the circular opening in the middle of the flange 5. Its diameter can be one-tenth to one-fifth of the outer diameter of the bushing 2. The convex ring 7 on the edge of the through hole 6 forms an axially extended structure through a flanging process. The flap 8 refers to the plate-like structure that is bent upward on both sides of the flange 5. The bending angle can be 90 degrees, which works with the convex ring 7 to form a multi-point riveting contact surface.

[0029] Specifically, during injection molding, the colloid 3 completely encapsulates the inner ring 4 and the outer edge of the bushing 2, forming a three-dimensional interlocking mechanical structure. Multiple flanges 5 are equidistantly distributed along the circumference, each flange 5 serving as an independent riveting unit. During assembly, mounting holes are opened at corresponding positions on the metal flow plate. After the convex ring 7 is inserted into the hole, pressure equipment causes the flap 8 and the convex ring 7 to undergo plastic deformation simultaneously, forming a permanent riveting connection. The presence of notches ensures that the deformation of each riveting point does not interfere with each other, ensuring consistent riveting quality. The axial height difference design between the inner ring 4 and the flanges 5 creates a clear functional partition between the colloid 3 coating layer and the riveting area. Compared with existing technologies, traditional solutions rely on welding or bolt connections, resulting in bulky structures. This solution achieves compact assembly through an integrated riveting structure. Existing injection molded parts generally use continuous annular flanges, which are prone to circumferential crack propagation. The split flange design of this solution disperses stress to multiple independent connection points. Conventional riveting structures rely on a single protrusion for fixation. In this solution, the protruding ring 7 and the flap 8 combine to form a double riveting contact, which significantly improves the torsional resistance.

[0030] In a further embodiment, the protruding direction of the convex ring 7 and the flap 8 is consistent with the direction of the side of the bushing 2 exposed on the colloid 3.

[0031] Among them, the convex ring 7 refers to the annular protrusion structure formed by extending the edge of the through hole 6 in the middle of the flange 5 towards one side of the axial direction. Specifically, it can be achieved by stamping a 0.5-1.2 mm high annular boss on the metal flange 5. Its function is to provide an axial positioning reference for the metal flow plate. The flap 8 refers to the plate-like structure formed by bending the flange 5 circumferentially on both sides in the same axial direction. Specifically, it can be achieved by bending a metal plate to form a 90-degree angle between the two sides. Its function is to cooperate with the convex ring 7 to form a multi-point riveting contact surface. Directional consistency means that the axial protrusion direction of the convex ring 7 and the flap 8 is on the same side as the end face of the bushing 2 that is not covered by the colloid 3. Its function is to ensure that the riveting force direction coincides with the positioning structure direction. Specifically, during the injection molding process of the colloid 3, the axial end face of the bushing 2 is not covered by the colloid 3 and remains exposed. When the convex ring 7 and the flap 8 are machined at the metal flange 5, their protrusion direction is set to be the same as that of the exposed end face of the bushing 2. When the metal flow plate is riveted and assembled, the operator can directly press the plate along the exposed end face of the bushing 2, so that the metal plate of the plate simultaneously contacts the annular boss of the convex ring 7 and the bent part of the flap 8. Since the protrusion direction of the convex ring 7 and the flap 8 is completely consistent with the direction of the assembly force, the metal plate deforms uniformly under axial pressure and wraps around the convex ring 7 and the flap 8, avoiding local stress concentration or bending angle deviation of the flap 8 caused by directional deviation.

[0032] like Figure 4 As shown, the design incorporates multiple runner openings 9 circumferentially extending through both sides of the inner metal ring 4. Each runner opening 9 refers to a perforated structure evenly distributed around the inner ring 4, which can be circular, elliptical, or polygonal, with its diameter designed to match the injection molding process parameters. This feature allows the colloid 3 to form a bidirectional flow path during injection molding. The circumferential arrangement means that multiple runner openings 9 are spaced apart along the circumference of the inner ring 4, specifically using an equiangular spacing distribution, with the distance between adjacent runner openings 9 adjusted according to the diameter of the inner ring 4. This feature ensures that the colloid 3 forms a symmetrical flow network within the metal insert. Specifically, during injection molding, the molten colloid 3 is injected from the mold gate and forms an axially penetrating flow channel through the runner openings 9. Simultaneously, the colloid 3 enters the runner openings 9 from both sides of the inner ring 4, creating a cross-penetrating flow state within the metal insert. This bidirectional flow method allows the colloid 3 to fully wet the inner and outer surfaces of the inner ring 4 and forms a mechanically interlocking structure within the runner openings 9. The circumferentially distributed flow channels 9 enable the colloid 3 to form a continuous coating layer in the circumferential direction, avoiding unfilled areas caused by local flow obstruction. After the colloid 3 cures, the colloidal pillars formed inside the flow channels 9 form multi-directional constraints with the pore walls of the inner ring 4, significantly enhancing the bonding strength between the metal and the colloid 3.

[0033] like Figure 3As shown, the outer edge of the inner ring 4 is provided with a bent portion 10, and a flange portion 5 is connected to the outside of the bent portion 10, so that the inner ring 4 and the flange portion 5 are at different axial heights. Both the inner ring 4 and the bent portion 10 are encased in the colloid 3. The bent portion 10 refers to the bent structure formed on the outer edge of the inner ring 4. Specifically, it can be formed by bending a metal sheet using a stamping process, thereby changing the axial positional relationship between the inner ring 4 and the flange portion 5 to form a three-dimensional support structure. The flange portion 5 being connected to the outside of the bent portion 10 means that multiple flange portions 5 are spaced apart along the outer periphery of the bent portion 10. This can be achieved by welding or integral stamping, creating an axially staggered arrangement between the flange portions 5 and the inner ring 4. The inner ring 4 and the bent portion 10 are both encased within the colloid 3, meaning that during injection molding, the colloid 3 completely covers the surfaces of the bent portion 10 and the inner ring 4. Specifically, this can be achieved by setting corresponding cavities in the mold to allow the colloid 3 to fill the recessed area formed by the bent portion 10, creating a mechanically interlocking structure. More specifically, the axial height difference formed by the bent portion 10 creates a stepped structure between the inner ring 4 and the flange 5. During injection molding, the colloid 3 flows and fills along the bending surface of the bent portion 10, forming a colloid layer that encapsulates both sides of the bent portion 10 after curing. The flange 5 connected to the outer side of the bent portion 10 has a higher axial height than the inner ring 4, creating a continuously distributed support area of ​​colloid 3 between the flange 5 and the inner ring 4. The encapsulation of the bent portion 10 by the colloid 3 not only increases the contact area between the metal insert and the colloid 3 but also restricts the displacement direction of the colloid 3 under stress through the geometry formed by the bent portion 10, thereby dispersing interfacial shear stress.

[0034] Furthermore, the upper surface of the colloid 3 is flush with the upper surface of the flange 5. The upper surface of the colloid 3 refers to the top plane of the cured colloid 3 after injection molding, which can be achieved using a planar positioning structure of the mold cavity. The smoothness of the colloid 3 surface is ensured by controlling the injection pressure and holding time. The upper surface of the flange 5 refers to the top surface of the outwardly extending protrusion on the metal disc 1, which can be formed into a planar structure through stamping, ensuring that this plane is parallel to the mold parting surface. Specifically, during injection molding, the top plane of the mold cavity simultaneously constrains the flow surface of the colloid 3 and the top surface of the flange 5. When the molten colloid 3 fills to the top of the flange 5, due to the limiting effect of the mold plane, the cured colloid 3 forms a contact interface that is completely coplanar with the top surface of the flange 5. This structure eliminates the stepped structure formed by axial misalignment between the colloid 3 and the metal insert in traditional injection molded parts, creating a continuous plane at the interface between the colloid 3 and the flange 5. When subjected to torque loads, the stress is evenly distributed along the bonding surface, avoiding cracking of the colloid 3 caused by localized stress concentration. At the same time, the flush structure allows the colloid 3 to form a complete coating layer on the top surface of the flange 5, increasing the contact area between the colloid 3 and the metal and improving the interfacial bonding strength.

[0035] like Figure 3As shown, an annular injection groove 11 is circumferentially provided on the outer wall of the bushing 2, and the inner edge of the colloid 3 is injection molded and embedded in the annular injection groove 11. The annular injection groove 11 refers to a groove structure that extends continuously circumferentially along the outer surface of the bushing 2. It can be formed by turning or stamping, and its depth and width are designed to match the wall thickness of the bushing 2 and the filling amount of the colloid 3. This groove structure provides embedding space for the colloid 3, forming a mechanical anchor by increasing the contact area. The inner edge of the colloid 3 refers to the portion of the colloid 3 material that flows along the outer wall of the bushing 2 and fills into the annular injection groove 11 during injection molding. After solidification, it forms a three-dimensional interlocking structure with the inner wall of the groove, enhancing the bonding strength through physical interlocking. Specifically, the circumferential continuous distribution of the annular injection groove 11 results in a uniform increase in the wrapping length of the colloid 3 on the outer wall of the bushing 2. During injection molding, the molten material of the colloid 3 fully fills the interior of the groove, and after solidification, it forms a circumferentially embedded bonding structure. When the assembly is subjected to circumferential shear force, the portion of the colloid 3 embedded in the groove generates contact pressure with the sidewall of the groove, limiting the relative displacement between the colloid 3 and the bushing 2 through a mechanical interlocking effect. Under the action of axial separation force, the colloid 3 embedded in the groove forms an inverted structure, effectively preventing the colloid 3 from peeling off from the surface of the bushing 2. Through the above technical solution, this application solves the problem of insufficient bonding strength between the bushing 2 and the colloid 3. The mechanical interlocking structure effectively resists the circumferential shear stress and axial separation force caused by alternating loads under high torque conditions, preventing relative displacement or separation between the colloid 3 and the bushing 2, and ensuring the structural stability and reliability of the transmission system during long-term operation.

[0036] Furthermore, an annular groove 12 is formed on the lower end face where the colloid 3 connects with the metal disc 1 and bushing 2. The annular groove 12 refers to the continuous closed-loop groove structure formed at the bottom of the contact interface between the colloid 3 and the metal disc 1 and bushing 2, which can be achieved using injection molding. This annular groove 12 forms a stress buffer area by changing the geometry of the interface between the colloid 3 and the metal. The lower end face of the colloid 3 refers to the contact surface that forms a mechanical connection with the metal disc 1 and bushing 2 after injection molding, which can be formed by adjusting the cavity structure of the injection mold. Specifically, under dynamic loads, shear stress concentration easily occurs at the edge of the interface between the colloid 3 and the metal. The annular groove 12 changes the load transmission path, decomposing the axial force into compressive stress on the sidewalls of the annular groove 12 and tensile stress in the bottom region. This stress distribution pattern reduces the stress peak at the interface edge, preventing the colloid 3 from cracking or debonding due to excessive local stress. Meanwhile, the closed-loop structure of the annular groove 12 ensures the uniformity of stress distribution and prevents interface failure caused by local stress concentration.

[0037] This application further proposes that the inner wall of the central hole 13 of the bushing 2 has a cross-section 14, making the cross-section of the central hole 13 "D" shaped; the side wall of the bushing 2 has bolt holes 15 that communicate with the central hole 13. The cross-section 14 of the inner wall of the central hole 13 refers to a planar structure formed by cutting, specifically, a milling process can be used to machine a planar area on the inner wall of the metal bushing 2 to form an asymmetrical hole structure. This cross-section 14 allows the shaft to form surface contact with the bushing 2, eliminating rotational degrees of freedom. The connection between the bolt hole 15 and the central hole 13 means that the axis of the threaded hole penetrating the side wall of the bushing 2 intersects the axis of the central hole 13. Specifically, a drilling process can be used to machine a through hole on the side wall of the bushing 2, forming a bolt installation channel. This hole arrangement allows the bolt to directly press against the surface of the shaft. Specifically, when the shaft is inserted into the "D" shaped central hole 13, its outer contour forms a surface contact constraint with the planar cross-section 14 of the inner wall of the bushing 2, preventing the shaft from sliding circumferentially under torque. Simultaneously, the bolt passes through the threaded hole in the side wall and is screwed into the pre-set threaded groove on the surface of the shaft, forming an axial mechanical lock. This dual fixing method restricts rotational movement through geometry and eliminates the risk of axial displacement through bolt preload.

[0038] In summary, the bushing assembly and its connection structure provided by this solution, by radially setting a flange 5 with a convex ring 7 and a flap 8 in the inner ring body 4, and using injection-molded colloid 3 to form a mechanical interlocking structure, and by directly riveting the convex ring 7 and flap 8 to the metal through-flow plate body, solves the problems of insufficient bonding strength between the metal and colloid 3 and reliance on additional fasteners, and has the advantages of improving connection reliability and simplifying the assembly process.

[0039] 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.

[0040] 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, comprising a disc body (1), a bushing (2) disposed at the center of the disc body (1), and a colloid (3) integrally connecting the inner edge of the disc body (1) and the outer edge of the bushing (2) by injection molding; characterized in that: The disc body (1) includes an inner ring body (4) that is injection molded and covered by the colloid (3), and a plurality of flange portions (5) disposed on the radially outer side of the inner ring body (4); The plurality of flange portions (5) are arranged regularly at intervals along the circumference of the inner ring body (4), and a gap is formed between two adjacent flange portions (5); The flange portion (5) has a through hole (6) in the middle, and the edge of the through hole (6) has a protruding ring (7) that protrudes towards the axial side. The flange portion (5) has flaps (8) that protrude on the same side as the protruding ring (7) on both circumferential sides. The convex ring (7) and the flap (8) are used for riveting connection with the metal flow plate body.

2. The bushing assembly of claim 1, wherein: The protruding direction of the convex ring (7) and the flap (8) is consistent with the direction of the bushing (2) exposed on the side of the colloid (3).

3. The bushing assembly of claim 1, wherein: The inner ring (4) is provided with multiple flow channels (9) in the circumferential direction. The flow channels (9) pass through both sides of the inner ring (4) and are used for the flow of injection molding material.

4. The bushing assembly of claim 1, wherein: The outer edge of the inner ring (4) is provided with a bent portion (10), and the flange portion (5) is connected to the outside of the bent portion (10), so that the inner ring (4) and the flange portion (5) are at different axial heights; the inner ring (4) and the bent portion (10) are both covered in the colloid (3).

5. The bushing assembly of claim 1, wherein: The upper end face of the colloid (3) is flush with the upper end face of the flange (5).

6. The bushing assembly of claim 1, wherein: The outer side wall of the bushing (2) is provided with an annular injection groove (11) in the circumferential direction, and the inner edge of the colloid (3) is injection molded into the annular injection groove (11).

7. The bushing assembly of claim 1, wherein: An annular groove (12) is provided on the lower end face of the colloid (3) that is in contact with the disc body (1) and the bushing (2).

8. The bushing assembly of claim 1, wherein: The inner wall of the central hole (13) of the bushing (2) is provided with a cross-section (14), so that the cross-section of the central hole (13) is "D" shaped; the side wall of the bushing (2) is provided with a bolt hole (15) that communicates with the central hole (13).

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