A swing arm bushing with improved axial stiffness, limiting and anti-friction

Abstract

The utility model discloses a kind of swing arm bushing of improving axial rigidity, limiting and anti-friction, it is related to the technical field of automobile parts, including bushing main body and the first limiting assembly and the second limiting assembly installed in the both ends of bushing main body;Bushing main body is composed of outer sleeve, second natural rubber, middle sleeve and inner sleeve;Second natural rubber is filled in the annular gap between outer sleeve, middle sleeve and inner sleeve;The first limiting assembly is composed of first assembly gasket, first natural rubber, first support gasket and first assembly framework;First natural rubber is filled in the annular gap between first assembly gasket, first support gasket, first assembly framework, and filling thickness is thinner;The utility model is filled in the annular gap between first assembly gasket, first support gasket, first assembly framework by first natural rubber, then through vulcanization process formation molecular level combination, no physical gap;The axial rigidity and axial limiting of bushing are improved.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts processing technology, specifically a swing arm bushing that improves axial stiffness, provides positioning and anti-friction. Background Technology

[0002] With the rapid development of the automotive industry, consumers are increasingly demanding higher quality vehicles. To meet this demand, automobiles are increasingly larger in size and heavier in weight, especially new energy vehicles, where the weight increase is more significant due to the battery pack. The increased weight of the vehicle leads to a significant increase in the load on the control arms during vehicle operation, which places more stringent requirements on the durability and noise prevention performance of the bushings.

[0003] Existing bushings suffer from unreasonable rubber layer thickness design and lack of rigid support structure. When subjected to axial loads, the rubber is prone to excessive elastic deformation, resulting in excessive axial displacement. This fails to meet the high rigidity and precise positioning requirements of heavy vehicles, thus affecting the overall vehicle handling stability. On the other hand, the components of existing bushings are mostly assembled using mechanical splicing methods. There are physical gaps between the metal frame and the gaskets. Under dynamic conditions such as impacts and torsion during vehicle operation, relative movement between components is prone to occur, leading to rigid collisions or friction, which generates abnormal noise. This is because the bushings cannot effectively absorb impact energy, further exacerbating the abnormal noise problem.

[0004] Patent CN206186716U discloses a swing arm bushing, in which a rubber bushing body is fixedly fitted onto an inner tube, and an outer tube is fitted onto the outside of the rubber bushing body, with a hollowed-out portion formed in the rubber bushing body; by setting the hollowed-out portion, the radial torsional stiffness of the swing arm bushing is reduced, which can enable the suspension to have better vibration damping performance.

[0005] However, this patent has the following drawbacks: the main body of the rubber sleeve is only connected to the inner and outer tubes through a "fixed set", lacking the cooperative support of rigid components. The axial force cannot be distributed and transmitted through a rigid structure and is entirely borne by the rubber. The rigidity of the hollowed-out rubber itself is insufficient, which further exacerbates the weakening of axial stiffness. When the axial force is too large, the rubber will continue to be compressed or stretched due to the deformation of the hollowed-out part. Without rigid components to limit the maximum displacement, the limit range of axial displacement cannot be clearly defined, and the rubber is prone to fatigue damage or connection failure due to excessive deformation. Utility Model Content

[0006] To address the shortcomings of existing bushings, which employ an inner sleeve, rubber, and outer sleeve structure, or an inner sleeve, middle sleeve, rubber, and outer sleeve structure without a limiting structure, leading to excessive axial displacement and affecting the overall vehicle handling stability; and the fact that the bushing components are mostly mechanically assembled, they are prone to relative movement under dynamic conditions such as impact and torsion, causing rigid collisions or frictional noises, this invention provides a swing arm bushing that improves axial stiffness, provides limiting, and prevents friction.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A swing arm bushing with improved axial stiffness, limiting and anti-friction features includes a bushing body and a first limiting assembly and a second limiting assembly installed at both ends of the bushing body; the bushing body is composed of an outer sleeve, a second natural rubber, a middle sleeve and an inner sleeve; the second natural rubber fills the annular gap between the outer sleeve, the middle sleeve and the inner sleeve.

[0009] The first limiting assembly consists of a first assembly gasket, a first natural rubber, a first support gasket, and a first assembly frame; the first natural rubber fills the annular gap between the first assembly gasket, the first support gasket, and the first assembly frame;

[0010] The second limiting assembly consists of a second assembly frame, a second support pad, a third natural rubber, and a second assembly pad; the third natural rubber fills the annular gap between the second assembly frame, the second support pad, and the second assembly pad.

[0011] Furthermore, the first limit assembly and the second limit assembly are symmetrically arranged, with a first support pad in the middle of the first limit assembly and a second support pad in the middle of the second limit assembly.

[0012] Furthermore, the inner sleeve is a rigid inner core, in the shape of a cylinder, located on the innermost side of the bushing body. The two ends of the inner sleeve are provided with a first assembly gasket and a second assembly gasket; the two ends of the inner sleeve are provided with a protruding structure.

[0013] Furthermore, the first support pad and the first assembly pad are arranged in parallel and have a gap; the second support pad and the second assembly pad are arranged in parallel and have a gap.

[0014] Furthermore, the outer surface of the inner sleeve is provided with a middle sleeve, and the outer surface of the middle sleeve is provided with an outer sleeve; the middle sleeve is a rigid cylindrical structure, located in the middle of the bushing body, and is coaxially arranged with the inner sleeve and has a gap.

[0015] Furthermore, the outer sleeve is a rigid shell, cylindrical in shape, located on the outermost side of the bushing body, coaxially arranged with the middle sleeve and having a gap; the length of the inner sleeve is greater than the lengths of the middle sleeve and the outer sleeve.

[0016] Furthermore, the outer jacket has a first assembly frame and a second assembly frame at each end; the first assembly frame and the second assembly frame are located on the outer side of the outer jacket; the first assembly frame and the second assembly frame extend to the middle jacket position; the first assembly frame and the second assembly frame are fitted to the outer jacket, and there is a gap between the first assembly frame and the second assembly frame and the middle jacket.

[0017] Furthermore, the two ends of the outer jacket are respectively interference-fitted with the inner sides of the first assembly frame and the second assembly frame, and the outer side of the first assembly frame facing the first assembly pad has an outward protrusion around it, forming a stepped structure.

[0018] The beneficial effects of this utility model are:

[0019] This utility model features a first limiting assembly and a second limiting assembly at both ends of the bushing body; a first natural rubber fills the annular gap between the first assembly gasket, the first support gasket, and the first assembly frame, with a filling thickness of 2-3 mm; a third natural rubber fills the annular gap between the second assembly frame, the second support gasket, and the second assembly gasket, with a filling thickness of 2-3 mm; the filling thickness is relatively thin, and then a molecular-level bond is formed through a vulcanization process, with no physical gaps; this improves the axial stiffness and axial limiting of the bushing, contributing to vehicle use and NVH (noise, vibration, and harshness).

[0020] This invention uses a second natural rubber to fill the annular gap between the outer, middle, and inner sleeves, and then forms a gapless bond through a vulcanization process. When the bushing is impacted by an external force, the natural rubber absorbs the impact energy through elastic deformation, reducing the direct transmission of impact force to the skeleton or gasket, and preventing rigid components from producing abnormal "hard-on-hard" noises due to violent collisions. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the assembly structure of the bushing of this utility model;

[0022] Figure 2 This is a detailed structural diagram of the components of the bushing of this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the first limiting assembly of this utility model;

[0024] Figure 4 This is a schematic diagram of the main body of the bushing of this utility model;

[0025] Figure 5 This is a schematic diagram of the structure of the second limiting assembly of this utility model.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1. First limiting assembly; 11. First assembly gasket; 12. First natural rubber; 13. First support gasket; 14. First assembly frame; 2. Bushing body; 21. Outer sleeve; 22. Second natural rubber; 23. Middle sleeve; 24. Inner sleeve; 3. Second limiting assembly; 31. Second assembly frame; 32. Second support gasket; 33. Third natural rubber; 34. Second assembly gasket. Detailed Implementation

[0028] 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.

[0029] Please see Figures 1-5 As shown, a swing arm bushing with improved axial stiffness, limiting and anti-friction properties includes a bushing body 2 and a first limiting assembly 1 and a second limiting assembly 3 installed at both ends of the bushing body 2; the first limiting assembly 1 and the second limiting assembly 3 are symmetrically arranged to jointly enhance the axial stiffness and limiting effect of the bushing.

[0030] Please see Figure 4 As shown, the bushing body 2 is composed of an outer sleeve 21, a second natural rubber 22, a middle sleeve 23, and an inner sleeve 24; the outer sleeve 21, the middle sleeve 23, and the inner sleeve 24 are cured into an inseparable whole through the vulcanization process of the second natural rubber 22.

[0031] The second natural rubber 22 fills the annular gap between the outer sleeve 21, the middle sleeve 23 and the inner sleeve 24, and forms a gapless bond with the three through a vulcanization process.

[0032] Please see Figure 3 As shown, the first limiting assembly 1 is composed of a first assembly gasket 11, a first natural rubber 12, a first support gasket 13, and a first assembly frame 14; the first assembly gasket 11, the first support gasket 13, and the first assembly frame 14 are cured into an inseparable whole through the vulcanization process of the first natural rubber 12; thus avoiding abnormal noises from the product under impact and torsion conditions.

[0033] When the bushing is impacted by an external force, the natural rubber absorbs the impact energy through elastic deformation, reducing the direct transmission of the impact force to the skeleton or gasket, and preventing the rigid components from producing abnormal "hard-on-hard" noise due to violent collisions.

[0034] The first natural rubber 12 fills the annular gap between the first assembly gasket 11, the first support gasket 13, and the first assembly skeleton 14, with a filling thickness of 2-3 mm; through the vulcanization process, it forms a molecular-level bond with the three components, with no physical gaps, thereby improving the axial stiffness and axial positioning of the bushing.

[0035] When the bushing is subjected to axial force, the support gasket will share part of the force, reducing the stress on the rubber. At the same time, the support gasket, the assembly gasket, and the skeleton form a "multi-point rigid support structure", which makes the transmission of axial force more dispersed and stable, avoiding the "softening and collapse" of local rubber due to excessive stress, thereby improving the overall ability of the structure to resist axial deformation.

[0036] Please see Figure 5 As shown, the second limiting assembly 3 is composed of a second assembly frame 31, a second support pad 32, a third natural rubber 33, and a second assembly pad 34; the second assembly frame 31, the second support pad 32, and the second assembly pad 34 are cured into an inseparable whole through the vulcanization process of the third natural rubber 33; thus avoiding abnormal noises from the product under impact and torsion conditions.

[0037] The third natural rubber 33 fills the annular gap between the second assembly frame 31, the second support pad 32, and the second assembly pad 34, with a filling thickness of 2-3 mm; it forms a molecular-level bond with the three through a vulcanization process, with no physical gaps; thus improving the axial stiffness and axial limiting of the bushing.

[0038] Please see Figure 2 As shown, the inner sleeve 24 is a rigid inner core with a cylindrical shape, located on the innermost side of the bushing body 2. The two ends of the inner sleeve 24 are provided with a first assembly gasket 11 and a second assembly gasket 34. The two ends of the inner sleeve 24 are provided with a protruding structure for riveting together with the first assembly gasket 11 and the second assembly gasket 34 to form an axial fastening.

[0039] The first limiting assembly 1 has a first support pad 13 in the middle, and the second limiting assembly 3 has a second support pad 32 in the middle; the first support pad 13 and the first assembly pad 11 are arranged in parallel and have a gap; the second support pad 32 and the second assembly pad 34 are arranged in parallel and have a gap.

[0040] The outer surface of the inner sleeve 24 is provided with a middle sleeve 23, and the outer surface of the middle sleeve 23 is provided with an outer sleeve 21. The middle sleeve 23 is a rigid cylindrical structure, located in the middle of the bushing body 2, and is coaxially arranged with the inner sleeve 24 with a gap. The outer sleeve 21 is a rigid outer shell, cylindrical in shape, located on the outermost side of the bushing body 2, and is coaxially arranged with the middle sleeve 23 with a gap. The length of the inner sleeve 24 is greater than the lengths of the middle sleeve 23 and the outer sleeve 21.

[0041] The outer sleeve 21 has a first assembly frame 14 and a second assembly frame 31 at its two ends respectively; the first assembly frame 14 and the second assembly frame 31 are symmetrically arranged; the first assembly frame 14 and the second assembly frame 31 are located on the outside of the outer sleeve 21; the first assembly frame 14 and the second assembly frame 31 extend to the middle sleeve 23; the first assembly frame 14 and the second assembly frame 31 are fitted to the outer sleeve 21, and there is a gap between the first assembly frame 14 and the second assembly frame 31 and the middle sleeve 23.

[0042] The two ends of the outer sleeve 21 are respectively interference-fitted with the inner sides of the first assembly frame 14 and the second assembly frame 31 to ensure that the bushing has no gap in the radial direction.

[0043] The outer side of the first assembly frame 14 facing the first assembly gasket 11 has an outward protrusion around the perimeter, forming a stepped structure, which provides axial restraint during bushing assembly.

[0044] Assembly principle:

[0045] When the bushing is in use, the first assembly frame 14 and the second assembly frame 31 together form the product outer sleeve 21, which is installed into the swing arm body. The vehicle body boundary is attached to the first assembly shim 11 and the second assembly shim 34 and fixed by bolts. There is no gap between the various parts of the product, so there will be no impact or friction noise. Then, the first natural rubber 12 is used to fill the annular gap between the first assembly shim 11, the first support shim 13 and the first assembly frame 14, the second natural rubber 22 is used to fill the annular gap between the outer sleeve 21, the middle sleeve 23 and the inner sleeve 24, and the third natural rubber 33 is used to fill the annular gap between the second assembly frame 31, the second support shim 32 and the second assembly shim 34. This improves the axial stiffness and limiting of the bushing, while avoiding the risk of abnormal noise caused by impact and friction, which helps the use of the whole vehicle and NVH.

[0046] 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.

[0047] 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. A rocker arm bushing for improving axial stiffness, limiting, and preventing friction, comprising a bushing body (2) and a first limiting assembly (1) and a second limiting assembly (3) installed at both ends of the bushing body (2); characterized in that, The bushing body (2) is composed of an outer sleeve (21), a second natural rubber (22), a middle sleeve (23), and an inner sleeve (24); the second natural rubber (22) fills the annular gap between the outer sleeve (21), the middle sleeve (23), and the inner sleeve (24); The first limiting assembly (1) is composed of a first mounting gasket (11), a first natural rubber (12), a first support gasket (13) and a first mounting frame (14); the first natural rubber (12) fills the annular gap between the first mounting gasket (11), the first support gasket (13) and the first mounting frame (14); The second limiting assembly (3) is composed of a second assembly frame (31), a second support pad (32), a third natural rubber (33) and a second assembly pad (34); the third natural rubber (33) fills the annular gap between the second assembly frame (31), the second support pad (32) and the second assembly pad (34).

2. The swing arm bushing for improving axial stiffness, limiting position, and preventing friction according to claim 1, characterized in that, The first limiting assembly (1) and the second limiting assembly (3) are symmetrically arranged. The first limiting assembly (1) is provided with a first support pad (13) in the middle, and the second limiting assembly (3) is provided with a second support pad (32) in the middle.

3. The swing arm bushing for improving axial stiffness, limiting position, and preventing friction according to claim 1, characterized in that, The inner sleeve (24) is a rigid inner core, in the shape of a cylinder, located on the innermost side of the bushing body (2). The two ends of the inner sleeve (24) are provided with a first assembly gasket (11) and a second assembly gasket (34); the two ends of the inner sleeve (24) are provided with a protruding structure.

4. A swing arm bushing for improving axial stiffness, limiting position, and preventing friction according to claim 2, characterized in that, The first support pad (13) and the first assembly pad (11) are arranged in parallel and have a gap; the second support pad (32) and the second assembly pad (34) are arranged in parallel and have a gap.

5. A swing arm bushing for improving axial stiffness, limiting position, and preventing friction according to claim 3, characterized in that, The outer surface of the inner sleeve (24) is provided with a middle sleeve (23), and the outer surface of the middle sleeve (23) is provided with an outer sleeve (21); the middle sleeve (23) is a rigid cylindrical structure, located in the middle of the bushing body (2), and is coaxially arranged with the inner sleeve (24) and has a gap.

6. A swing arm bushing for improving axial stiffness, limiting position, and preventing friction according to claim 5, characterized in that, The outer sleeve (21) is a rigid shell, cylindrical in shape, located on the outermost side of the bushing body (2), and coaxially arranged with the middle sleeve (23) with a gap; the length of the inner sleeve (24) is greater than the length of the middle sleeve (23) and the outer sleeve (21).

7. A swing arm bushing for improving axial stiffness, limiting position, and preventing friction according to claim 6, characterized in that, The outer jacket (21) has a first assembly frame (14) and a second assembly frame (31) at both ends respectively; the first assembly frame (14) and the second assembly frame (31) are located on the outside of the outer jacket (21); the first assembly frame (14) and the second assembly frame (31) extend to the middle jacket (23); the first assembly frame (14) and the second assembly frame (31) are fitted to the outer jacket (21), and there is a gap between the first assembly frame (14) and the second assembly frame (31) and the middle jacket (23).

8. A swing arm bushing for improving axial stiffness, limiting position, and preventing friction according to claim 7, characterized in that, The two ends of the outer jacket (21) are respectively interference-fitted with the inner sides of the first assembly frame (14) and the second assembly frame (31). The outer side of the first assembly frame (14) facing the first assembly pad (11) has an outward protrusion around one end, forming a stepped structure.

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