Novel open type bushing for expansion hole-free shaft joint

Abstract

The utility model belongs to the technical field of automobile chassis spare parts, concretely relates to a novel open type hole expanding free axle joint bushing, including the inner skeleton, second rubber layer, middle skeleton, first rubber layer and outer skeleton that are coaxial from inside to outside in proper order, the middle skeleton is equipped with an opening that penetrates the pipe wall along the axial direction on the pipe wall, the pipe wall middle part of the middle skeleton is further equipped with at least one round hole.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive chassis components, and more specifically, it relates to a novel open-type hole-expanding-free shaft joint bushing. Background Technology

[0002] Automotive chassis axle joint bushings are core components for achieving flexible connections between chassis axles and the vehicle frame. Their main functions are to buffer road impacts, reduce vibration transmission, and ensure the rotational accuracy of the axles. In existing technologies, multi-frame bushings typically employ a "double-frame + single-layer rubber" structure, with the frame and rubber connected via a high-temperature vulcanization process or ordinary adhesives.

[0003] However, this structure generally suffers from the following problems: First, the core skeleton of the mainstream bushing is a closed design, which requires special hole-expanding equipment to process before assembly to fit the outer diameter of the shaft. The hole-expanding process not only increases the equipment investment cost, but also has a long production cycle. Hole-expanding deviation can also easily lead to assembly difficulties or abnormal noise during operation. Moreover, the double skeleton support structure is prone to overall deformation under long-term load conditions, resulting in insufficient structural strength and affecting the service life and reliability of the bushing.

[0004] Secondly, the vibration reduction performance of a single-layer rubber structure is limited, making it difficult to meet the higher requirements for vibration isolation in high-comfort vehicles.

[0005] Therefore, in view of this, we have studied and improved the existing structure and its shortcomings, and provided a new type of open-type hole-reducing bushing to achieve a more practical purpose. Utility Model Content

[0006] In view of the problems mentioned in the background art above, this utility model provides a novel open-type hole-expanding-free shaft joint bushing.

[0007] The technical solution adopted by this utility model is as follows: a novel open-type non-expanding shaft joint bushing, comprising an inner skeleton, a second rubber layer, a middle skeleton, a first rubber layer and an outer skeleton arranged coaxially from the inside to the outside; the tube wall of the middle skeleton is provided with an opening that penetrates the tube wall along the axial direction, and the middle part of the tube wall of the middle skeleton is also provided with at least one round hole.

[0008] Furthermore, the opening angle of the opening is 15°-20° on one side.

[0009] Furthermore, a positioning protrusion for assembly positioning is provided through the outer peripheral surface of the second rubber layer.

[0010] Furthermore, the inner surface of the inner skeleton is provided with a wear-resistant coating.

[0011] Furthermore, the wall thickness of the central skeleton is 1-2 mm.

[0012] Furthermore, the wall thickness of the outer skeleton is 2-3 mm.

[0013] Furthermore, the thickness of both the first rubber layer and the second rubber layer is 3-6 mm.

[0014] The beneficial effects of this utility model are: 1. The axial opening of the central skeleton transforms it from a rigid ring into an elastic hoop, allowing for radial elastic deformation during assembly to adaptively wrap around the shaft, thus eliminating the need for hole enlargement. Furthermore, the opening design of the central skeleton allows for minute, controllable changes in its opening angle under torsion, with stiffness far lower than deforming a complete metal ring, significantly reducing the bushing's torsional stiffness. Simultaneously, the combination of the double rubber layer and the central skeleton with circular holes forms a multi-level vibration isolation interface and vibration energy dissipation path. The circular holes also allow the rubber to form mechanical interlocks during vulcanization, greatly improving vibration reduction efficiency and bandwidth, overcoming the limitations of single-layer rubber structures. In addition, the stable structure of alternating triple skeletons and double rubber layers results in a more uniform load distribution, significantly enhancing the overall structural stiffness and deformation resistance, effectively improving the product's load-bearing durability and reliability.

[0015] 2. The design parameters of the opening angle take into account the radial elastic deformation capacity and structural integrity of the central skeleton, ensuring that the shaft is not damaged under large pressing force during assembly; and ensuring that it will not fail prematurely or undergo permanent deformation due to stress concentration during long-term use. Controlling the opening angle to 15°-20° on one side ensures easy assembly while maintaining sufficient circumferential stiffness of the central skeleton, providing stable support for the inner and outer rubber layers, and guaranteeing the long-term reliability of the product. Attached Figure Description

[0016] This utility model can be further illustrated by the non-limiting embodiments given in the accompanying drawings; Figure 1 This is a schematic diagram of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a top view and a cross-sectional view in the horizontal direction of this utility model; Figure 4 This is a top view and a vertical sectional view of the present invention. The attached diagram is labeled as follows: Inner skeleton 1, positioning protrusion 11, second rubber layer 2, middle skeleton 3, opening 31, round hole 32, first rubber layer 4, outer skeleton 5. Detailed Implementation

[0017] like Figures 1-4As shown, a novel open-type hole-expanding-free shaft joint bushing includes an inner skeleton 1, a second rubber layer 2, a middle skeleton 3, a first rubber layer 4, and an outer skeleton 5 arranged coaxially from the inside to the outside; the tube wall of the middle skeleton 3 is provided with an opening 31 that penetrates the tube wall along the axial direction, and the middle part of the tube wall of the middle skeleton 3 is also provided with at least one round hole 32.

[0018] By adopting the above technical solution, the axial opening 31 of the central skeleton 3 transforms it from a rigid ring into an elastic hoop, allowing it to undergo radial elastic deformation during assembly to adaptively wrap the shaft, thus eliminating the need for the hole-expanding process. At the same time, the combination of the double rubber layer and the central skeleton 3 with the circular hole 32 forms a multi-level vibration isolation interface and vibration energy dissipation path. The circular hole 32 further allows the rubber to form a mechanical interlock during vulcanization, thereby significantly improving the vibration reduction efficiency and bandwidth, overcoming the limitations of the single-layer rubber structure. In addition, the stable structure of the alternating three skeletons and double rubber layers makes the load distribution more uniform, significantly enhancing the overall structural stiffness and deformation resistance, effectively improving the product's load-bearing durability and reliability.

[0019] As a preferred embodiment, the opening angle of the opening 31 is 15°-20° on one side. The parameter design of the opening angle takes into account the radial elastic deformation capacity and structural integrity of the central frame 3, ensuring that the shaft is not damaged under large pressing forces during assembly; and ensuring that it will not fail prematurely or undergo permanent deformation due to stress concentration during long-term use. Controlling the opening angle of 31 to 15°-20° on one side ensures easy assembly while maintaining sufficient circumferential stiffness of the central frame 3, providing stable support for the inner and outer rubber layers, and guaranteeing the long-term reliability of the product.

[0020] As a preferred embodiment, a positioning protrusion 11 for assembly positioning is provided through the outer peripheral surface of the second rubber layer 2. When the bushing is pressed into the external mounting seat, the positioning protrusion 11 contacts the wall of the mounting seat hole and interferes, thereby pre-tightening the bushing in the radial direction and limiting its circumferential position.

[0021] As a preferred embodiment, the inner surface of the inner frame 1 is provided with a wear-resistant coating. This reduces frictional loss between the bushing and the shaft, extending their service life.

[0022] As a preferred embodiment, the wall thickness of the inner frame 3 is 1-2 mm. Using a sufficiently thin material allows for effective radial elastic deformation while ensuring its basic support function as a frame. The advantage of this design is that it controls the weight and material cost of the parts while achieving the elastic function required for hole expansion, and ensures that it does not become unstable due to excessive weakness in a multi-layered structure, maintaining the overall structural hierarchy of the bushing.

[0023] As a preferred embodiment, the wall thickness of the outer frame 5 is 2-3 mm. Increasing the material thickness significantly improves the moment of inertia of the cross-section, thereby enhancing its resistance to bending and deformation. The effect is a significant improvement in the structural stiffness and load-bearing strength of the outermost layer of the bushing, effectively resisting installation pressing forces and complex loads during long-term use, preventing the outer frame 5 from crushing or deforming, and providing a robust external constraint for the internal multi-layered structure.

[0024] As a preferred embodiment, the thickness of both the first rubber layer 4 and the second rubber layer 2 is 3-6 mm. Each rubber layer can independently attenuate and absorb vibration energy transmitted from different paths. Compared to a single-layer rubber structure, the advantage of this design is that it provides two vibration isolation interfaces and a longer energy transmission path, thereby achieving wider bandwidth and more efficient isolation of high-frequency and low-frequency vibrations, and significantly improving the overall vibration reduction effect.

[0025] The present invention has been described in detail above. The specific embodiments are provided only to help understand the method and core idea of ​​the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A novel open-type, hole-reducing-free shaft joint bushing, characterized in that: It includes an inner skeleton (1), a second rubber layer (2), a middle skeleton (3), a first rubber layer (4), and an outer skeleton (5) arranged coaxially from the inside to the outside; The central frame (3) has an opening (31) that extends through the pipe wall along the axial direction, and the central frame (3) also has at least one round hole (32) in the middle of the pipe wall.

2. The novel open-type, hole-reducing-free shaft joint bushing according to claim 1, characterized in that: The opening angle of the opening (31) is 15°-20° on one side.

3. The novel open-type hole-reducing bushing according to claim 1, characterized in that: A positioning protrusion (11) for assembly positioning is provided through the outer peripheral surface of the second rubber layer (2).

4. The novel open-type hole-reducing bushing according to claim 1, characterized in that: The inner surface of the inner skeleton (1) is provided with a wear-resistant coating.

5. A novel open-type, hole-reducing-free shaft joint bushing according to claim 1, characterized in that: The wall thickness of the central skeleton (3) is 1-2 mm.

6. The novel open-type hole-reducing bushing according to claim 1, characterized in that: The wall thickness of the outer skeleton (5) is 2-3 mm.

7. A novel open-type, hole-reducing-free shaft joint bushing according to claim 1, characterized in that: The thickness of the first rubber layer (4) and the second rubber layer (2) is 3-6 mm.

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