An elliptical rubber bushing

Abstract

This utility model discloses an elliptical rubber bushing, including an outer bushing tube and an inner bushing tube arranged coaxially. The outer bushing tube is composed of a straight part and a semi-circular part forming an elliptical structure. An integral rubber main spring is vulcanized in the gap between the inner wall of the outer bushing tube and the outer wall of the inner bushing tube. An integral rubber strap is vulcanized on the outer surface of the outer bushing tube. Through a high-temperature vulcanization process, the outer bushing tube, the inner bushing tube, the rubber main spring, and the rubber strap are vulcanized into one piece to form an elliptical rubber bushing. Utilizing its asymmetrical structure, it provides differentiated stiffness in different directions. The higher stiffness in the longitudinal direction ensures support stability, while the larger elastic deformation space in the lateral direction can effectively absorb vibration, achieving independent control of multi-directional stiffness and adapting to compact installation spaces. This solves the technical problems of existing circular bushings having a limited range of adjustable stiffness in a specific direction, making it difficult to meet the dynamic performance requirements under complex working conditions and the limited space in some installation scenarios.

Description

Technical Field

[0001] This utility model belongs to the field of rubber bushing technology, specifically, it relates to an elliptical rubber bushing. Background Technology

[0002] Rubber bushings are components widely used in the mechanical and engineering fields, mainly used to reduce friction and vibration, and provide cushioning and protection. They are usually made of high-performance rubber materials, with excellent elasticity and wear resistance. Their high elasticity and wear resistance can effectively reduce friction and wear between metal parts, while adapting to loads in different directions, improving equipment stability and service life.

[0003] Patent CN222950297U discloses an automotive rubber bushing. By setting detachable structures at multiple locations on the circular rubber bushing, it not only effectively prevents the rubber ring from slipping off, but also allows for individual disassembly and replacement of parts, providing great convenience for maintenance personnel. In addition, the ability to disassemble individual parts without replacing the entire part also reduces costs.

[0004] However, the rubber bushing used in the above-mentioned patented technical solution is a traditional circular structure. In actual use, the symmetrical characteristics of the circular structure cause its stiffness adjustment range in a specific direction (such as radial direction) to be limited by its inherent geometry, making it difficult to achieve precise stiffness matching for complex and variable dynamic load conditions (such as multi-directional impact or asymmetric vibration).

[0005] In addition, when there are constraints in the installation space (such as narrow holes or irregularly shaped assembly cavities), standard circular bushings often cannot be fitted due to poor size matching, and may even cause an imbalance in pre-compression due to forced installation, affecting the damping performance, thus having certain limitations. Utility Model Content

[0006] One of the objectives of this utility model is to provide an elliptical rubber bushing to solve the technical problem that, in the prior art, the adjustable range of stiffness of circular rubber bushings in a specific direction is limited, making it difficult to meet the dynamic performance requirements under complex working conditions.

[0007] The second objective of this utility model is to provide an elliptical rubber bushing to solve the technical problem of limited space in some installation scenarios for circular rubber bushings in the prior art.

[0008] The objective of this utility model can be achieved through the following technical solutions: An elliptical rubber bushing includes an outer bushing tube and an inner bushing tube arranged coaxially; the outer bushing tube is composed of a straight part and a semi-circular part forming an elliptical structure; an integral rubber main spring is vulcanized in the gap between the inner wall of the outer bushing tube and the outer wall of the inner bushing tube; and an integral rubber strap is vulcanized on the outer surface of the outer bushing tube.

[0009] Furthermore, the inner tube of the bushing has a hexagonal trumpet-shaped structure, and the upper diameter of the inner tube is larger than the lower diameter.

[0010] Furthermore, the inner tube of the bushing has six circular holes arranged in a circumferential array at the upper middle position, and all the holes penetrate the tube wall.

[0011] Furthermore, the rubber main spring has an I-shaped cross-section, and the rubber thickness t1 in the long axis direction is greater than the thickness t2 in the short axis direction.

[0012] Furthermore, the inner wall of the bushing inner tube is also provided with multiple obliquely arranged ribs at equal intervals.

[0013] Furthermore, the inner tube of the bushing has corresponding grooves at the upper and lower positions of the inner wall.

[0014] The beneficial effects of this utility model are: 1. This utility model uses a high-temperature vulcanization process to vulcanize and combine the outer bushing tube, inner bushing tube, rubber main spring, and rubber straps together to form an elliptical rubber bushing. Utilizing its asymmetrical structure, it provides differentiated stiffness in different directions. The higher stiffness in the longitudinal direction ensures support stability, while the larger elastic deformation space in the lateral direction can effectively absorb vibration, achieving independent control of multi-directional stiffness and adapting to compact installation spaces. It solves the technical problems of the limited adjustable range of stiffness in specific directions of the circular bushings commonly used in the prior art, which makes it difficult to meet the dynamic performance requirements under complex working conditions and the limited space in some installation scenarios.

[0015] 2. By designing the inner tube of the bushing as a hexagonal trumpet-shaped structure, this utility model not only effectively improves assembly convenience and mechanical performance, enhances the anti-rotation fit with the connecting parts, and avoids relative sliding, but also facilitates the insertion and guidance of shaft parts, reducing installation difficulty. In addition, the enlarged upper diameter increases the contact area with the external structure and improves load-bearing stability, while the narrowed lower part optimizes stress distribution and reduces local stress concentration, thereby improving the overall structural strength and durability while ensuring convenient installation.

[0016] 3. This utility model uses a vulcanization process to fix the I-shaped cross-section rubber main spring, which effectively improves the mechanical properties and vibration reduction effect of the bushing: its I-shaped structure forms differentiated stiffness in the axial and radial directions, providing high support force in the axial direction to maintain structural stability, while having good elasticity in the radial direction to absorb vibration and impact; in addition, the I-shaped cross-section design also increases the contact area between rubber and metal, enhances the bonding strength, prevents delamination, and optimizes the stress distribution, so that the bushing has both durability and buffering when bearing multi-directional loads.

[0017] 4. This utility model features a rubber strap fixed to the outer surface of the bushing outer tube through a vulcanization process. The high-temperature vulcanization forms a strong molecular bond, effectively isolating direct contact between metal components and fundamentally avoiding electrochemical corrosion and rust. During assembly, the unique elastic deformation capacity of the rubber material absorbs the impact energy of the press fitting, significantly reducing the risk of surface scratches and deformation common in traditional metal-to-metal direct press fitting, thus greatly improving the assembly qualification rate. Furthermore, the rubber strap and the mounting hole employ a precisely designed interference fit, ensuring structural stability after installation and eliminating the lubrication process required in traditional assembly, simplifying the production process and reducing maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a top view of the present invention; Figure 3 This is a cross-sectional view of the overall structure of this utility model; Figure 4 This is a schematic diagram of the structure of the rubber main spring in this utility model; Figure 5 This is a schematic diagram of the structure of the metal inner tube in this utility model; The attached diagram lists the components represented by each number as follows: 1. Outer bushing tube; 101. Straight section; 102. Semicircular section; 2. Inner bushing tube; 3. Rubber strap; 4. Rubber main spring; 5. Round hole; 6. Rib; 7. Groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1-5As shown, an elliptical rubber bushing includes an outer bushing tube 1 and an inner bushing tube 2 coaxially arranged, both made of metal. The outer bushing tube 1 has an elliptical structure and is composed of a straight portion 101 and a semi-circular portion 102. The inner bushing tube 2 has a hexagonal trumpet-shaped structure, and the upper diameter of the inner bushing tube 2 is larger than the lower diameter, which is beneficial to improve assembly convenience and mechanical performance, and can prevent incorrect assembly and reverse installation of the bushing. Six circular holes 5 in a circumferential array are opened at the upper middle position of the inner bushing tube 2. These holes 5 penetrate the tube wall to enhance the bonding strength between the rubber and the metal, while optimizing stress distribution, reducing weight, and improving heat dissipation performance, so that the inner bushing tube 2 has better flexibility and durability under dynamic loads.

[0021] A rubber main spring 4 is vulcanized and formed in the gap between the inner wall of the bushing outer tube 1 and the outer wall of the bushing inner tube 2. The rubber main spring 4 has a basically I-shaped cross section, and the rubber thickness t1=20.6 in the long axis direction is greater than the thickness t2=12.1 in the short axis direction, which facilitates the formation of differentiated stiffness in the axial and radial directions, effectively improving the mechanical properties and vibration reduction effect of the bushing.

[0022] The dynamic vibration isolation principle of rubber bushings: Long shaft and high stiffness → suppress low-frequency large-amplitude vibrations (such as vehicle body roll). Short axis and low stiffness → attenuate high-frequency small-amplitude vibrations (such as road noise) → achieve frequency division vibration isolation.

[0023] The outer surface of the bushing outer tube 1 is vulcanized with an integral rubber strap 3. This rubber strap 3 can not only effectively isolate the direct contact between metal parts and prevent corrosion, but also absorb impact energy during assembly, thereby significantly reducing the risk of damage during press fitting, improving assembly reliability and product service life. In addition, the rubber strap 3 is interference-fitted with the mounting hole, eliminating the need for grease and simplifying the installation process.

[0024] The inner wall of the bushing inner tube 2 is also provided with multiple obliquely arranged ribs 6 at equal intervals. These ribs 6 are used to disperse axial and radial loads, optimize stress distribution, and improve fatigue resistance. The inner tube 2 is provided with corresponding grooves 7 at the upper and lower parts of the inner wall. The corresponding grooves 7 structure plays a guiding and positioning role during assembly, ensuring the coaxiality of the inner and outer tubes and avoiding uneven wear.

[0025] To facilitate understanding of the above-mentioned technical solution of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below: This invention uses a high-temperature vulcanization process to vulcanize and combine the outer bushing tube 1, inner bushing tube 2, rubber main spring 4, and rubber strap 3 together to form an elliptical rubber bushing. Utilizing its asymmetrical structure, it provides differentiated stiffness in different directions. The higher longitudinal stiffness ensures support stability, while the larger lateral elastic deformation space effectively absorbs vibration, achieving independent multi-directional stiffness control and adapting to compact installation spaces. This solves the technical problems of existing circular bushings, which have limited adjustable stiffness range in specific directions, making it difficult to meet dynamic performance requirements under complex working conditions and addressing space constraints in some installation scenarios.

[0026] In this invention, by designing the inner tube 2 of the bushing as a hexagonal trumpet-shaped structure, it can not only effectively improve the ease of assembly and mechanical performance, enhance the anti-rotation fit with the connecting parts, and avoid relative sliding, but also facilitate the insertion and guidance of the shaft parts, reducing the difficulty of installation; in addition, the enlarged upper diameter can increase the contact area with the external structure and improve the load-bearing stability, while the narrowing of the lower part can optimize the stress distribution and reduce local stress concentration, thereby improving the overall structural strength and durability while ensuring convenient installation.

[0027] This invention uses a vulcanization process to fix the I-shaped cross-section rubber main spring 4, effectively improving the mechanical properties and vibration reduction effect of the bushing. Its I-shaped structure forms differentiated stiffness in the axial and radial directions. The axial direction provides high support force to maintain structural stability, while the radial direction has good elasticity to absorb vibration and impact. In addition, the I-shaped cross-section design also increases the contact area between the rubber and the metal, enhances the bonding strength, prevents delamination, and optimizes the stress distribution, so that the bushing has both durability and buffering when subjected to multi-directional loads.

[0028] This invention features a rubber strap 3 fixed to the outer surface of the bushing outer tube 1 via a vulcanization process. The high-temperature vulcanization forms strong molecular bonds, effectively isolating direct contact between metal components and fundamentally preventing electrochemical corrosion and rust. During assembly, the unique elastic deformation capacity of the rubber material absorbs the impact energy of the press fitting, significantly reducing the risk of surface scratches and deformation common in traditional metal-to-metal direct press fitting, thus greatly improving the assembly qualification rate. Furthermore, the rubber strap 3 and the mounting hole employ a precisely designed interference fit, ensuring structural stability after installation and eliminating the need for lubrication required in traditional assembly, simplifying the production process and reducing maintenance costs.

[0029] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. An elliptical rubber bushing, comprising an outer bushing tube (1) and an inner bushing tube (2) coaxially arranged; characterized in that: The bushing outer tube (1) is composed of a straight part (101) and a semi-circular part (102) forming an elliptical structure; a rubber main spring (4) is vulcanized in the gap between the inner wall of the bushing outer tube (1) and the outer wall of the bushing inner tube (2); a rubber strap (3) is vulcanized on the outer surface of the bushing outer tube (1).

2. The elliptical rubber bushing according to claim 1, characterized in that: The inner tube (2) of the bushing has a hexagonal trumpet-shaped structure, and the upper diameter of the inner tube (2) is larger than the lower diameter.

3. The elliptical rubber bushing according to claim 1, characterized in that: The inner tube (2) of the bushing has six circular holes (5) arranged in a circumferential array at the upper middle position, and all the circular holes (5) penetrate the tube wall.

4. The elliptical rubber bushing according to claim 1, characterized in that: The rubber main spring (4) has an I-shaped cross section, and the rubber thickness t1 of the rubber main spring (4) in the long axis direction is greater than the thickness t2 in the short axis direction.

5. An elliptical rubber bushing according to claim 1, characterized in that: The inner wall of the bushing inner tube (2) is also provided with multiple obliquely arranged ribs (6) at equal intervals.

6. An elliptical rubber bushing according to claim 1, characterized in that: The inner tube of the bushing (2) has a corresponding groove (7) at the upper and lower positions of the inner wall.

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