Extruded tube necking bush

Abstract

The utility model relates to an extrusion tube necking bush which comprises an extrusion inner tube, a rubber layer arranged around the extrusion inner tube and an outer ring arranged around the rubber layer, a plurality of through holes are formed in the rubber layer, and each through hole comprises a first through hole part and a second through hole part which are distributed in the axial direction of the rubber layer and are in butt joint. A first port of the first through hole part is located on a first end face of the rubber layer, a second port of the first through hole part is communicated with a first port of the second through hole part, and a second port of the second through hole part is located on a second end face of the rubber layer; the radial width of the first through hole part is gradually reduced from a first port to a second port, and the radial width of the second through hole part is gradually increased from the first port to the second port; the radial width of the two ends of the cross section of the through hole is larger than the radial width of the middle portion of the cross section of the through hole. According to the utility model, the use requirement of low rigidity in the hollow direction is met, the vibration in the vertical direction can be better absorbed in the solid direction, and the comfort in the vertical direction is better improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to an extruded tube necking bushing. Background Art

[0002] With the rapid development of automobile technology, most A-class and B-class passenger cars will adopt the front McPherson and rear multi-link suspension layout. The advantage of this layout is good shock absorption effect and high ride comfort.

[0003] Automotive necking bushings are essential components for controlling longitudinal, lateral, and radial movement in multi-link suspensions. High-damping extruded tube core bushings, acting as flexible connectors between the suspension and the connecting rods, significantly impact the vehicle's overall cushioning and shock absorption. Typically, to balance comfort and handling, the vehicle requires lower stiffness in the forward and backward directions, while requiring higher stiffness in the vertical direction. To meet these stiffness requirements, extruded tube core necking bushings are designed as hollow bushings. However, these hollow bushings often use a single rubber formula, which provides low radial stiffness in the hollow direction while also exhibiting low stiffness in the solid direction, making it difficult to meet the required stiffness requirements. Summary of the Invention

[0004] The purpose of the utility model is to provide an extruded tube neck bushing which meets the use requirement of low rigidity in the hollow direction and can better absorb vertical vibration in the solid direction and better improve the comfort in the vertical direction.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A kind of extruded tube necking bushing, comprising an extruded inner tube, a rubber layer arranged around the outer side surface of the extruded inner tube and an outer ring arranged around the outer side surface of the rubber layer, wherein a plurality of through holes are opened on the rubber layer, and the through holes include a first through hole portion and a second through hole portion which are distributed and connected along the axial direction of the rubber layer, the first port of the first through hole portion is located on the first end surface of the rubber layer, the second port of the first through hole portion is connected with the first port of the second through hole portion, and the second port of the second through hole portion is located on the second end surface of the rubber layer; the radial width of the first through hole portion gradually decreases from its first port to its second port, and the radial width of the second through hole portion gradually increases from its first port to its second port; the cross section of the through hole extends in an arc shape, and the radial widths of the two ends of the cross section of the through hole are greater than the radial width of the middle portion.

[0007] The radial width of the first port of the first through-hole portion is equal to the radial width of the second port of the second through-hole portion.

[0008] The radial width of the first through hole portion decreases linearly from the first port to the second port, and the radial width of the second through hole portion increases linearly from the first port to the second port.

[0009] Both ends of the cross section of the through hole are circular.

[0010] The rubber layer is provided with two through holes which are axially symmetrically arranged.

[0011] The extruded inner tube is provided with a plurality of axial holes extending along its axial direction, and the axial holes are distributed around the central axis of the extruded inner tube.

[0012] The cross section of the axial hole is arc-shaped.

[0013] The extruded inner tube is provided with three axial holes.

[0014] Both ends of the outer ring are bent inwardly along the radial direction to cover the end surface edges of the rubber layer.

[0015] The extruded inner tube and the outer ring are both made of aluminum alloy.

[0016] Due to the application of the above technical solution, the utility model has the following advantages compared with the existing technology: the utility model can not only meet the use requirements of low stiffness in the hollow direction, but also better absorb vertical vibrations in the solid direction and better improve vertical comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attachment Figure 1 It is a top view schematic diagram of the extruded tube necking bushing of the present invention.

[0018] Attachment Figure 2 This is a schematic AA cross-sectional view of the extruded tube necking bushing of the present invention.

[0019] In the above figures: 1. extruded inner tube; 2. rubber layer; 3. outer ring; 4. center through hole; 5. axial hole; 6. through hole. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0021] Example 1: As shown in the attached Figure 1 and attached Figure 2 As shown, an extruded tube necking bushing includes an extruded inner tube 1, a rubber layer 2 and an outer ring 3.

[0022] The extruded inner tube 1 is constructed from high-strength aluminum alloy 6082-T6, offering high strength, excellent corrosion resistance, and easy coating. The extruded inner tube 1 is cylindrical in shape, with a central through-hole 4 defined along its axis. Furthermore, the extruded inner tube 1 is provided with a plurality of axial holes 5 extending along its axial direction, distributed around the central axis of the extruded inner tube 1. In this embodiment, three axial holes 5 are provided in the extruded inner tube 1, each having an arcuate cross-section, such that the axial holes 5 are concentrically arranged around the end face of the extruded inner tube 1.

[0023] The rubber layer 2 surrounds the outer surface of the extruded inner tube 1. Made of low-hardness natural rubber (NR), it offers high wear resistance and high resilience. The rubber layer 2 is provided with a plurality of through-holes 6 extending axially. These through-holes 6 comprise a first through-hole portion and a second through-hole portion, which are aligned and connected along the axial direction of the rubber layer 2. The first end of the first through-hole portion is located on the first end face of the rubber layer 2, while the second end of the first through-hole portion intersects the first end of the second through-hole portion. The second end of the second through-hole portion is located on the second end face of the rubber layer 2. The radial widths of both the first and second through-hole portions vary, decreasing from the first end to the second end, while increasing from the first end to the second end. In this embodiment, the radial width of the first through-hole portion decreases linearly from the first end to the second end, while the radial width of the second through-hole portion increases linearly from the first end to the second end. The radial widths of the first and second through-hole portions are equal. The through hole 6 also has an arc-shaped cross section, with the radial width at the ends of the cross section being greater than the radial width in the middle. The middle section of the through hole 6 is arc-shaped, while the ends of the through hole 6 are circular. In this embodiment, two through holes 6 are defined in the rubber layer 2, and the two through holes 6 are arranged axially symmetrically.

[0024] Outer ring 3 surrounds the outer surface of rubber layer 2. It is also made of high-strength aluminum alloy 6060-T6, which offers high strength, excellent corrosion and oxidation resistance, and is easy to process and coat. The ends of outer ring 3 are bent radially inward to cover the end edges of rubber layer 2.

[0025] The processing steps of the above-mentioned extruded tube neck bushing are as follows:

[0026] 1) Inner tube 1:

[0027] It is cut by CNC machine tools, then degreased and sandblasted. In order to facilitate bonding, a layer of special glue is applied on the surface that contacts the rubber.

[0028] 2) Outer ring 3:

[0029] It is cut by CNC machine tools, then degreased and sandblasted. In order to facilitate bonding, a layer of special glue is applied on the surface that contacts the rubber.

[0030] 3) Rubber layer 2:

[0031] Then put the inner tube 1 and outer ring 3 into the mold, inject the flowing rubber, and vulcanize and shape;

[0032] Finally, in order to improve the durability of the high-damping extruded inner tube 1 bushing, the vulcanized bushing is necked and both ends of the outer ring 3 are bent.

[0033] The above-mentioned extruded tube necking bushing is suitable for the rigid connection between the connecting rod and the suspension. The high-damping rubber has a higher dynamic hardening level and improved dynamic stiffness, which can well absorb the vibration fed back to the car chassis by the road surface, so that the car body remains stable and the riding comfort of the driver and passengers is improved.

[0034] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those familiar with the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. An extruded tube necking bushing, comprising an extruded inner tube, a rubber layer disposed around the outer side of the extruded inner tube, and an outer ring disposed around the outer side of the rubber layer, characterized in that: The rubber layer is provided with a plurality of through holes, the through holes including a first through hole portion and a second through hole portion that are distributed and connected to each other along the axial direction of the rubber layer. The first end of the first through hole portion is located on the first end surface of the rubber layer, the second end of the first through hole portion is connected to the first end of the second through hole portion, and the second end of the second through hole portion is located on the second end surface of the rubber layer. The radial width of the first through hole portion gradually decreases from the first end to the second end, while the radial width of the second through hole portion gradually increases from the first end to the second end. The cross-section of the through hole extends in an arc shape, and the radial width of the two ends of the cross-section of the through hole is greater than the radial width of the middle portion.

2. The extruded tube necking bushing according to claim 1, characterized in that: The radial width of the first port of the first through-hole portion is equal to the radial width of the second port of the second through-hole portion.

3. The extruded tube necking bushing according to claim 1, characterized in that: The radial width of the first through hole portion decreases linearly from the first port to the second port, and the radial width of the second through hole portion increases linearly from the first port to the second port.

4. The extruded tube necking bushing according to claim 1, characterized in that: Both ends of the cross section of the through hole are circular.

5. The extruded tube necking bushing according to claim 1, characterized in that: The rubber layer is provided with two through holes which are axially symmetrically arranged.

6. The extruded tube necking bushing according to claim 1, characterized in that: The extruded inner tube is provided with a plurality of axial holes extending along its axial direction, and the axial holes are distributed around the central axis of the extruded inner tube.

7. The extruded tube necking bushing according to claim 6, characterized in that: The cross section of the axial hole is arc-shaped.

8. The extruded tube necking bushing according to claim 6, characterized in that: The extruded inner tube is provided with three axial holes.

9. The extruded tube necking bushing according to claim 1, characterized in that: Both ends of the outer ring are bent inwardly along the radial direction to cover the end surface edges of the rubber layer.

10. The extruded tube necking bushing according to claim 1, wherein: The extruded inner tube and the outer ring are both made of aluminum alloy.

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