A rubber bushing for an automobile

Abstract

The utility model relates to a rubber bushing for automobile, including metal core shaft, metal outer tube and the rubber buffer body between metal core shaft and metal outer tube, bushing still includes the transition body of setting between rubber buffer body and metal outer tube, and the transition body includes rubber body and reinforcing body, rubber body sets up at rubber buffer body periphery, and reinforcing body sets up in rubber body, and reinforcing body is annular, and reinforcing body is provided with one or more, when reinforcing body is provided with a plurality of, a plurality of reinforcing body is distributed along the height direction of bushing in proper order. The utility model provides a rubber bushing for automobile, sets up the transition body, from metal outer tube, transition body to rubber buffer body, forms modulus gradient, disperses most interface stress mutation, and the buffer modulus mutation eliminates the early failure risk caused by stress concentration, under the premise of controlling cost, prolongs the fatigue life of bushing, satisfies the long -term use demand of automobile.

Description

Technical Field

[0001] This utility model relates to a rubber bushing for automobiles. Background Technology

[0002] As a key shock-absorbing component in automotive suspension systems, rubber-metal bushings face two common challenges in long-term reliability:

[0003] 1. Interface stress concentration: Traditional structures directly vulcanize and bond rubber to the metal surface. Due to the significant difference in modulus between rubber and metal, a drastic stress change occurs at the interface under load, which can easily cause the rubber to crack or even fall off.

[0004] 2. Weak anti-peeling ability: Although the existing improvement scheme adds grooves to the metal mandrel to enhance mechanical interlocking, the failure to optimize the modulus transition leads to stress concentration at the root of the groove, and the adhesive is prone to aging and failure in humid and hot environments, making it difficult for mechanical interlocking and chemical bonding to work synergistically. Utility Model Content

[0005] The purpose of this invention is to provide a rubber bushing for automobiles.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An automotive rubber bushing includes a metal mandrel, a metal outer tube, and a rubber buffer body located between the metal mandrel and the metal outer tube. The bushing also includes a transition body disposed between the rubber buffer body and the metal outer tube. The transition body includes a rubber body and a reinforcing body. The rubber body is sleeved on the periphery of the rubber buffer body, and the reinforcing body is disposed within the rubber body. The reinforcing body is annular, and one or more reinforcing bodies are provided. When multiple reinforcing bodies are provided, the multiple reinforcing bodies are distributed sequentially along the height direction of the bushing.

[0008] According to some embodiments of the present invention, a gap is maintained between two adjacent reinforcements.

[0009] According to some embodiments of this utility model, the reinforcing body and the rubber body are coaxially arranged.

[0010] According to some embodiments of this utility model, the reinforcing body is made of nylon fiber, polyester fiber, aramid fiber or rayon fiber.

[0011] According to some embodiments of this utility model, multiple transition bodies are provided, and the multiple transition bodies are nested sequentially and coaxially arranged.

[0012] According to some embodiments of the present invention, the rubber body includes a first rubber layer and a second rubber layer, and the reinforcing body is located between the first rubber layer and the second rubber layer.

[0013] According to some embodiments of this utility model, the reinforcing body has a circular cross-section; and / or, the thickness of the transition body is 2-5 mm; and / or, the upper end face of the rubber body is flush with the upper end face of the metal outer tube, and the lower end face of the rubber body is flush with the lower end face of the metal outer tube.

[0014] According to some embodiments of the present invention, the outer peripheral surface of the metal mandrel is provided with a plurality of protrusions, the protrusions protruding away from the center of the metal mandrel, and the plurality of protrusions are arranged along the axial direction of the metal mandrel.

[0015] According to some embodiments of this utility model, the protrusions are arc-shaped; the spacing between two adjacent protrusions is equal.

[0016] According to some embodiments of this utility model, the rubber body is styrene-butadiene rubber or natural rubber; the rubber buffer body is natural rubber.

[0017] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0018] The automotive rubber bushing provided by this utility model features a transition body that forms a modulus gradient from the metal outer tube and transition body to the rubber buffer body. This gradient disperses most of the sudden changes in interfacial stress, buffers the sudden changes in modulus, and eliminates the risk of early failure caused by stress concentration. Under the premise of cost control, it extends the fatigue life of the bushing and meets the long-term use requirements of automobiles. It also has good environmental stability. The convex part on the outer periphery of the metal mandrel cooperates with the rubber buffer body to reduce the dependence on adhesives. The performance degradation rate after damp heat aging is reduced, the interfacial anti-peeling ability is improved, and the interfacial durability under complex working conditions is enhanced. Attached Figure Description

[0019] Appendix Figure 1 A cross-sectional view of the automotive rubber bushing provided by this utility model;

[0020] Appendix Figure 2 Structural diagram of the automotive rubber bushing provided by this utility model;

[0021] Appendix Figure 3 A plan view of the transition body for the automotive rubber bushing provided by this utility model before molding;

[0022] Appendix Figure 4 A side view of the transition body for the automotive rubber bushing provided by this utility model before molding.

[0023] In the attached diagrams above:

[0024] 1-Metal outer tube; 2-Rubber body, 21-First rubber layer, 22-Second rubber layer; 3-Rubber buffer body; 4-Metal mandrel, 41-Protrusion; 5-Reinforcing body. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] See Figures 1 to 4 The illustrated automotive rubber bushing includes a metal mandrel 4, a metal outer tube 1, and a rubber buffer 3 located between the metal mandrel 4 and the metal outer tube 1. The bushing also includes a transition body located between the rubber buffer 3 and the metal outer tube 1, wherein:

[0029] The transition body includes a rubber body 2 and a reinforcing body 5. The rubber body 2 is fitted around the outer periphery of the rubber buffer body 3, and the reinforcing body 5 is disposed inside the rubber body 2. The reinforcing body 5 is annular and coaxially arranged with the rubber body 2. There are one or more reinforcing bodies 5. When there are multiple reinforcing bodies 5, they are distributed sequentially along the height direction of the bushing. From the outside to the inside, that is, from the metal outer tube 1, the transition body to the rubber buffer body 3, the metal outer tube 1 has a high hardness, the rubber buffer body 3 has a low hardness, the hardness of the transition body is between that of the metal outer tube 1 and the rubber buffer body 3, and the modulus of the transition body is between that of the metal outer tube 1 and the rubber buffer body 3, forming a modulus gradient (metal outer tube 1 → transition body → rubber buffer body 3). Compared with traditional structures, this disperses most of the interface stress abrupt changes and buffers the modulus abrupt changes, eliminating the risk of early failure caused by stress concentration.

[0030] In this example, the upper end face of the rubber body 2 is flush with the upper end face of the metal outer tube 1, and the lower end face of the rubber body 2 is flush with the lower end face of the metal outer tube 1.

[0031] In some embodiments, for the same transition body, multiple reinforcements 5 are distributed sequentially along the height direction of the bushing, with a certain gap between adjacent reinforcements 5, and the gap is filled with rubber.

[0032] In some embodiments, the reinforcement 5 has a circular cross-section. The reinforcement 5 is made of nylon fiber (nylon staple fiber), polyester fiber, aramid fiber or rayon fiber. If polyester fiber is used, it is such as PET, PEN, PTT; if nylon fiber is used, it is such as nylon 6 or nylon 66.

[0033] In some embodiments, multiple transition bodies are provided, and the multiple transition bodies are sequentially nested and coaxially arranged. The hardness of the rubber body 2 of the transition body gradually decreases from the direction away from the metal core 4 to the direction closer to the metal core 4.

[0034] In this example, the thickness of the transition body is selected and designed based on the overall structural performance of the bushing. In some embodiments, the thickness of the transition body is 2-5 mm.

[0035] In this example, the rubber body 2 includes a first rubber layer 21 and a second rubber layer 22, and the reinforcement 5 is located between the first rubber layer 21 and the second rubber layer 22.

[0036] The preparation method of the transition body for the automotive rubber bushing in this example is as follows: prepare a first rubber layer 21, a second rubber layer 22, and a plurality of elongated reinforcing bodies 5, and place the elongated reinforcing bodies 5 between the first rubber layer 21 and the second rubber layer 22 (see...). Figure 4The material is then mixed, rolled into a sheet of a certain thickness, and then cut. The cut sheet is pre-fixed to the inner wall of the metal outer tube 1 by hot pressing, and pressure is maintained at a set temperature and pressure to eliminate air bubbles and ensure no wrinkles.

[0037] In some embodiments, the rubber body 2 is styrene-butadiene rubber or natural rubber; the rubber buffer body 3 is natural rubber.

[0038] In some embodiments, a plurality of protrusions 41 are provided along the axial direction on the outer peripheral surface of the metal mandrel 4. The protrusions 41 protrude away from the center of the metal mandrel 4, and the plurality of protrusions 41 are arranged along the axial direction of the metal mandrel 4. Preferably, the protrusions 41 are arc-shaped. The spacing between two adjacent protrusions 41 is equal, similar to a sine wave. The protrusions 41 are formed by machining the outer peripheral surface of the metal mandrel 4 through turning or machining center. The advantages of providing protrusions 41 are: the rubber buffer 3 mechanically engages with the protrusions 41 to form displacement constraints, enhance mechanical locking, improve the interface anti-peeling ability, and the tensile strength is better than that of traditional designs; it reduces the dependence on adhesives and reduces the performance degradation rate after damp heat aging.

[0039] In this example, the outer metal tube 1 is cylindrical with a central hole in the middle. The inner wall of the hole in the outer metal tube 1 is sandblasted. The metal mandrel 4 is made of 45# steel or low alloy steel bar.

[0040] The preparation method of the automotive rubber bushing in this example is as follows:

[0041] 1. Prepare a metal mandrel 4, a metal outer tube 1, and a transition body. The transition body is pre-fixed to the inner wall of the metal outer tube 1 by hot pressing.

[0042] 2. Position the pre-installed transition body metal outer tube 1 and metal mandrel 4 coaxially;

[0043] 3. Material for making the rubber buffer body 3 is injected between the metal mandrel 4 and the transition body. Under set temperature and pressure conditions, the rubber buffer body 3 and the rubber body 2 of the transition body are vulcanized, wherein the rubber buffer body 3 forms a matching concave portion on the protrusion 41 on the metal mandrel 4. The vulcanization of the transition body and the rubber buffer body 3 is completed simultaneously, eliminating the secondary vulcanization step and reducing the working time.

[0044] The advantages of the automotive rubber bushing in this example are:

[0045] 1. A transition body is set up to form a modulus gradient from the metal outer tube and the transition body to the rubber buffer body, which disperses most of the sudden changes in interface stress, buffers the sudden changes in modulus, and eliminates the risk of early failure caused by stress concentration.

[0046] 2. By leveraging the crack-resistant effect of the reinforcing body in the transition body, crack propagation under alternating loads can be effectively suppressed, thus extending service life;

[0047] 3. The displacement constraint synergistic effect of the transition body and the convex part on the outer periphery of the metal mandrel enhances the synergistic fatigue resistance, effectively suppresses crack propagation under alternating loads, and extends service life.

[0048] 4. Good environmental stability: The convex part on the outer periphery of the metal mandrel cooperates with the rubber buffer to reduce the dependence on adhesives. The performance degradation rate after damp heat aging is reduced, the interface anti-peeling ability is improved, and the tensile strength is better than that of the traditional cylindrical metal mandrel; the interface durability under complex working conditions is improved.

[0049] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A rubber bushing for automobiles, comprising a metal mandrel, a metal outer tube, and a rubber buffer body located between the metal mandrel and the metal outer tube, characterized in that, The bushing also includes a transition body disposed between the rubber buffer body and the metal outer tube. The transition body includes a rubber body and a reinforcing body. The rubber body is sleeved on the periphery of the rubber buffer body, and the reinforcing body is disposed within the rubber body. The reinforcing body is annular, and one or more reinforcing bodies are provided. When multiple reinforcing bodies are provided, the multiple reinforcing bodies are distributed sequentially along the height direction of the bushing.

2. The automotive rubber bushing according to claim 1, characterized in that, A gap is maintained between two adjacent reinforcements.

3. The automotive rubber bushing according to claim 1, characterized in that, The reinforcing body is coaxially arranged with the rubber body.

4. The automotive rubber bushing according to claim 1, characterized in that, The reinforcing material is made of nylon fiber, polyester fiber, aramid fiber or rayon fiber.

5. The automotive rubber bushing according to claim 1, characterized in that, Multiple transition bodies are provided, and the multiple transition bodies are nested sequentially and coaxially arranged.

6. The automotive rubber bushing according to claim 1, characterized in that, The rubber body includes a first rubber layer and a second rubber layer, and the reinforcement is located between the first rubber layer and the second rubber layer.

7. The automotive rubber bushing according to claim 1, characterized in that, The reinforcing body has a circular cross-section; and / or, the thickness of the transition body is 2-5 mm; and / or, the upper end face of the rubber body is flush with the upper end face of the metal outer tube, and the lower end face of the rubber body is flush with the lower end face of the metal outer tube.

8. The automotive rubber bushing according to claim 1, characterized in that, The outer circumferential surface of the metal mandrel is provided with a plurality of protrusions, the protrusions protruding away from the center of the metal mandrel, and the plurality of protrusions are arranged along the axial direction of the metal mandrel.

9. The automotive rubber bushing according to claim 8, characterized in that, The protrusions are arc-shaped; the spacing between two adjacent protrusions is equal.

10. The automotive rubber bushing according to claim 1, characterized in that, The rubber body is styrene-butadiene rubber or natural rubber; the rubber buffer is natural rubber.

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