A subframe bushing with anti-rotation and anti-slip structure and plastic-coated inner core

Abstract

This utility model discloses a subframe bushing plastic-coated inner core with an anti-rotation and anti-slip structure, comprising an inner core and an outer plastic layer; the outer surface of the inner core is provided with multiple vertically arranged anti-rotation protrusions; the anti-rotation protrusions are provided with a crisscrossing fish-scale pattern. This subframe bushing plastic-coated inner core significantly improves the mechanical bonding force with the plastic coating layer by optimizing the surface structure of the metal inner core, thus possessing outstanding advantages in anti-rotation, anti-slip, lightweight, process feasibility, and environmental adaptability. By designing a composite anti-slip texture on the surface of the metal inner core, bidirectional mechanical locking in both axial and circumferential directions is achieved, avoiding the limitations of traditional single-pattern designs.

Description

Technical Field

[0001] This utility model relates to an anti-rotation and anti-slip structure, specifically to a subframe bushing plastic-coated inner core with an anti-rotation and anti-slip structure. Background Technology

[0002] Subframe bushings are key damping components in automotive chassis suspension systems. Their core function is to buffer and isolate vibrations while ensuring a stable connection between the subframe and the vehicle body. Traditional bushings typically use a metal core (such as a steel or aluminum tube) encased in elastic materials like rubber or polyurethane to improve stiffness and damping performance.

[0003] However, with the trend of lightweighting in automobiles, aluminum alloy cores are gradually replacing steel to reduce weight and improve corrosion resistance. But the surface of aluminum alloy is relatively smooth, and the bonding strength with the plastic coating (such as nylon, POM and other engineering plastics) is insufficient. Under long-term alternating loads, relative rotation (anti-rotation failure) or axial movement (anti-migration failure) can easily occur, leading to bushing loosening, abnormal noise, or even structural damage.

[0004] Currently, the common subframe bushing core structures in the industry mainly include the following solutions:

[0005] 1. The outer surface of the metal inner tube is a smooth cylindrical surface, and the bonding force with the plastic layer is enhanced by chemical adhesives (such as epoxy resin). However, the adhesive is prone to aging in high temperature and high humidity environments, and interface delamination may still occur under long-term dynamic loads.

[0006] 2. Some products have straight grooves machined on the surface of the metal inner tube to improve mechanical interlocking force (see reference). Figure 1 However, due to the single direction of the texture, it can only improve the axial anti-runaway performance, while the circumferential anti-rotation capability is insufficient, and it cannot withstand high torque conditions (such as torsional stress during rapid acceleration or braking). Utility Model Content

[0007] To address the problems existing in the prior art, this utility model provides a subframe bushing with a plastic-coated inner core featuring an anti-rotation and anti-slip structure, thereby solving the aforementioned technical problems.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: a subframe bushing plastic-coated inner core with an anti-rotation and anti-slip structure, comprising an inner core and an outer plastic layer; the outer surface of the inner core is provided with multiple vertically arranged anti-rotation protrusions; the anti-rotation protrusions are provided with a fish scale pattern structure arranged in a crisscross pattern.

[0009] Furthermore, the fish scale pattern structure includes multiple irregularly shaped protrusions, with grooves provided between adjacent irregularly shaped protrusions.

[0010] Furthermore, the angle between the groove line of the adjacent groove and the vertical axis of the inner core body is an acute angle.

[0011] Furthermore, the inner core is an extruded aluminum alloy profile, and the fish scale pattern is formed by roll forming.

[0012] The beneficial effects of this utility model are as follows: By optimizing the surface structure of the metal inner core, the plastic-coated inner core of this subframe bushing significantly improves the mechanical bonding force with the plastic coating layer, thus possessing outstanding advantages in anti-rotation (torsion resistance), anti-slip (axial displacement resistance), lightweighting, process feasibility, and environmental adaptability. By designing composite anti-slip textures on the surface of the metal inner core, bidirectional mechanical locking in both axial and circumferential directions is achieved, avoiding the limitations of traditional single-texture designs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the background technology;

[0014] Figure 2 This is a schematic diagram of the structure of this utility model;

[0015] Figure 3 This is an enlarged schematic diagram of a portion of the fish scale pattern structure of this utility model.

[0016] In the diagram: 1. Inner core, 2. Fish scale pattern, 21. Irregularly shaped protrusions, 22. Adjacent grooves, 3. Anti-rotation protrusions. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0019] like Figure 2 and Figure 3 As shown, a subframe bushing with anti-rotation and anti-slip structure includes an inner core 1 and an outer plastic layer; the outer surface of the inner core 1 is provided with multiple vertically arranged anti-rotation protrusions 3; the anti-rotation protrusions 3 are provided with a fish scale pattern 2 arranged in a crisscross pattern.

[0020] In this preferred embodiment, the fish scale pattern structure 2 includes multiple irregularly shaped protrusions 21, and a groove 22 is provided between adjacent irregularly shaped protrusions 21.

[0021] In this preferred embodiment, the angle between the groove line of the adjacent groove 22 and the vertical axis of the inner core 1 is an acute angle.

[0022] In this preferred embodiment, the inner core 1 is an aluminum alloy extruded profile, and the fish scale pattern 2 is formed by roll forming.

[0023] This utility model relates to a novel structure for increasing the press-out force of a plastic-coated inner tube in a bushing. It is mainly used in the design of increasing the press-out force of the plastic-coated inner core of a subframe bushing. It features a simple structure and strong functionality. The outer tube of the inner core is decorated with a crisscrossing fish-scale pattern, and the axially distributed grooves or protrusions form a "barbed effect," providing a large coefficient of friction after encapsulating the plastic. This not only prevents product rotation but also prevents vertical movement, effectively increasing the press-out force. When assembled with bolts at the customer's site, after applying a torque of 90 Nm, there is no relative rotation or movement between the plastic encapsulation and the inner tube, fully meeting the requirements.

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A subframe bushing with a anti-rotation and anti-slip structure, characterized in that, It includes an inner core (1) and an outer plastic layer; the outer surface of the inner core (1) is provided with multiple vertically arranged anti-rotation protrusions (3); the anti-rotation protrusions (3) are provided with a fish scale pattern structure (2) arranged in a crisscross pattern.

2. The subframe bushing with anti-rotation and anti-slip structure according to claim 1, characterized in that, The fish scale pattern structure (2) includes multiple irregular protrusions (21), and a groove (22) is provided between adjacent irregular protrusions (21).

3. The subframe bushing plastic-coated inner core with an anti-rotation and anti-slip structure according to claim 2, characterized in that, The angle between the groove line of the adjacent groove (22) and the vertical axis of the inner core (1) is an acute angle.

4. The subframe bushing plastic-coated inner core with anti-rotation and anti-slip structure according to claim 1, characterized in that, The inner core (1) is an aluminum alloy extruded profile, and the fish scale pattern (2) is formed by rolling.

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