Combined material bushing

Abstract

The present invention provides a composite material liner, which may include a center plate and an outer foam, the outer foam being formed outside the center plate to surround the center plate and being made of different kinds of materials.

Description

Technical Field

[0001] The present invention relates to a composite material bushing, and more particularly, to a composite material bushing in which different kinds of materials are mixed. Background Art

[0002] The vehicle is equipped with a suspension that attenuates ground impact and connects wheels to the vehicle. The suspension can be divided into a rigid axle suspension in which both wheels are connected to one axle, and an independent suspension in which both wheels are connected to respective axles, according to its shape.

[0003] Examples of independent suspensions include McPherson suspensions, double wishbone suspensions, and multi-link suspensions. A double rear multi-link suspension includes an upper arm, a lower arm, a rear subframe, and a trailing arm, wherein the upper arm is connected between the axle and the frame, and the trailing arm is connected between the axle and the vehicle body.

[0004] The trailing arm bushing is provided on a connection portion between the trailing arm and the vehicle body. A through hole having a predetermined size is formed on an end of the trailing arm. The trailing arm bushing is press-fitted into the through hole to buffer vibration or impact received from a road surface, thereby minimizing the transmission of the vibration or impact to the vehicle body.

[0005] Figure 1 A conventional trailing arm bushing 1 is shown. Figure 1 As shown, a conventional trailing arm bushing 1 includes an outer iron material 2 having a predetermined diameter, a cylindrical rubber 3 installed inside the outer iron material 2, and a core 4 passing through the center of the rubber 3 and connected to a vehicle body.

[0006] However, the core 4 provided in the conventional trailing arm bushing 1 is manufactured by casting alloy. After casting, a time difference occurs between the cooling of the relatively thick center 4A of the core and the cooling of the relatively thin end 4B of the core, and therefore, it is difficult to make the center 4A and the end 4B of the core have uniform strength. Summary of the invention

[0007] The present invention has been accomplished in order to solve the above-mentioned problems, and an object of the present invention is to provide a composite material bushing in which the center and the end portions of a core portion can have uniform strength.

[0008] The composite material liner includes a center panel and an outer foam which is formed outside the center panel to surround the center panel and is made of different kinds of materials.

[0009] A hole may be provided at the center of the center plate to prevent the outer foam from being separated from the center plate.

[0010] A pin having a length greater than the thickness of the center panel and less than the thickness of the outer foam may be mounted in the hole.

[0011] A central region of the center panel may be bent at least once to prevent the outer foam from separating from the center panel.

[0012] The center of the center plate may be provided with a hole to prevent the outer foam from being separated from the center plate, and a center area of ​​the center plate may be bent at least once.

[0013] The edge of the center panel may be provided with anti-separation jaws to prevent the outer foam from being separated from the center panel.

[0014] The center plate may have a rectangular shape, and the separation preventing jaws may be formed on any one of long edges of the center plate to face each other.

[0015] The center plate may have a rectangular shape, and the anti-separation jaws may be formed by cutting inward from outsides of long edges of the center plate.

[0016] The center panel and the outer foam may be selectively made of a material having a targeted strength or ductility in either metal or non-metal.

[0017] The center panel may be made of a steel material having strength through press molding or extrusion molding, and the outer foam may be formed on the outside of the center panel through injection molding and made of plastic.

[0018] A fastening hole may be provided at each of both ends in the longitudinal direction of the center plate.

[0019] The fastening hole may be provided with a guide pin.

[0020] The center of the fastening hole may be formed not to be located on the central axis of the center plate in the longitudinal direction.

[0021] The radius of curvature of each corner of the center panel may be different from each other.

[0022] An imaginary first line segment passing through both sides of the center plate in the width direction (e.g., passing through the centers of both sides of the center plate) and an imaginary second line segment passing through both sides of the outer foam in the width direction (e.g., passing through the centers of both sides of the outer foam) do not overlap with each other.

[0023] A central area of ​​the central panel in contact with the outer foam may be provided with a bonding material.

[0024] The bonding material may be a material that is melted by heating when the outer foam is injection-molded.

[0025] The melting point of the center panel may be higher than the melting point of the outer foam, and the melting point of the outer foam may be higher than the melting point of the bonding material.

[0026] According to the composite material bushing according to an embodiment of the present invention constructed as described above, since the core is set in the form of external foam installed on the outside of the center plate, the strength of the center and end of the core can be uniform, and the core can have the same shape as a conventional core.

[0027] Furthermore, since the center panel is disposed obliquely on the outer foam, vehicle body fastening can be easily performed.

[0028] In addition, since the fastening holes are provided at both ends of the center plate to have an offset, the area of ​​the center plate increases and the rigidity increases, and the bonding strength between the center plate and the outer foam increases.

[0029] Furthermore, since the curvature radii of the corners of the center panel are set to be different from each other, the curvature radii can be variably applied so as to be optimized for vehicle body fastening.

[0030] Furthermore, productivity, reliability and quality of the bushing can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 An exemplary view showing a conventional trailing arm bushing of the prior art.

[0032] Figures 2 to 4 is a perspective view of a core disposed in a composite material bushing according to an embodiment of the present invention.

[0033] Figures 5 to 7 yes Figure 2 An exemplary view of the center panel of FIG.

[0034] Figure 8 Is set in Figure 2 Cross-sectional view of a core within a composite material bushing.

[0035] Fig. 9 Is set in Figure 2 An exemplary view of a combined material in a combined material bushing.

[0036] Fig.10 is a flow chart of a method of manufacturing a core disposed in a composite material bushing according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] Hereinafter, a composite material bushing according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0038] Reference Figures 2 to 10 The composite material bushing according to an embodiment of the present invention includes a core, the core includes a center plate 100 and an outer foam 200, the outer foam 200 is formed outside the center plate 100 to surround the center plate 100, and is made of different kinds of materials. Rubber is installed outside the outer foam 200, and an outer iron material is installed to surround the outside of the rubber. The composite material bushing according to an embodiment of the present invention may have various names and may be applied to a plurality of interconnected links to form a vehicle structure.

[0039] As materials constituting the center plate 100 and the outer foam 200, materials that meet target strength, ductility or machinability in metal or non-metal may be selectively applied. When selecting a material forming the center plate 100, it is preferred to select a material that provides uniform strength throughout the center portion of the core of the composite material bushing to the end of the core. In the case where the outer foam 200 is selectively made of a material that is easy to change in shape and has high machinability, when produced, the outer foam 200 may have the same shape as a conventional core or any shape that may be applied to a specific connecting rod.

[0040] The center panel 100 is connected to the vehicle body to support the load from the vehicle body. The outer foam 200 transfers the load transferred from the vehicle body to the center panel 100 to the rubber. The shape of the rubber is determined according to the shape of the outer foam 200. The outer foam 200 should have strength not to be damaged by the load transferred from the center panel 100. The outer foam 200 may be made of plastic, aluminum, or magnesium.

[0041] According to one example, the center plate 100 is made of steel having strength. The center plate 100 is produced by stamping or extrusion. The center plate 100 can be made of various materials such as ordinary high stress steel such as SAPH440, steel materials such as S25C and S45C, and the like.

[0042] The outer foam 200 may be made of a plastic material. The outer foam 200 may be formed on the outside of the center panel 100 by injection molding. The outer foam 200 may be selectively made of a material having a lower melting point than the center panel 100 so that the shape of the center panel 100 may be maintained during injection molding. The outer foam 200 may be made of a plastic in which a general nylon series such as PA66+GF30% (PA66 reinforced with glass fiber (30%)) and glass fiber are mixed, or other various plastics that can be injection molded. The outer foam 200 may be manufactured with a composition of PA66+GF30% or PA66+GF50%. The outer foam 200 may be manufactured with various compositions other than PA66+GF30% or PA66+GF50%.

[0043] like Figure 2As shown, since the outer foam 200 is connected to the center plate 100 by penetrating the center plate 100 during injection molding, a hole 110 is formed at the center of the center plate 100 to prevent the outer foam 200 from being separated from the center plate 100. One or more holes 110 may be provided.

[0044] like Figure 3 As shown, a pin 111 shaped like a tube may be installed in the hole 110. The length of the pin 111 is greater than the thickness of the center plate 100 and less than the thickness of the outer foam 200.

[0045] like Figure 4 As shown, the central area of ​​the center plate 100 may be bent at least once (i.e., the top surface of the central area of ​​the center plate 100 is raised) to prevent the outer foam 200 from being separated from the center plate 100. In addition, the hole 110 may be provided at the center of the center plate 100, and the central area of ​​the center plate 100 may be bent at least once so as to be able to prevent the outer foam 200 from being separated from the center plate 100.

[0046] like Figure 5 and Figure 6 As shown, the center panel 100 may be formed in a rectangular shape, and the anti-separation jaws 140 may be formed on the center panel 100 to prevent the outer foam 200 from being separated from the center panel 100. When the outer foam 200 is formed on the center panel 100 by injection molding, the protruding jaws 210 contacting the anti-separation jaws 140 are formed on the inner side of the outer foam 200. By making the anti-separation jaws 140 contact the protruding jaws 210, the outer foam 200 is prevented from being separated from the center panel 100.

[0047] like Figure 5 As shown, the anti-separation jaw 140 may be formed at the center portion of one of the long sides of the center plate 100. Any one of the long sides of the center plate 100 is continuously cut at a predetermined angle from the end of the bottom surface of the center plate 100, and as a result, the anti-separation jaw 140 is formed to face the edge of the center plate 100.

[0048] like Figure 6 As shown, the anti-separation jaws 140 may be formed by cutting inward from the outside of the long edges of the center panel 100 .

[0049] Reference Figures 2 to 7 , fastening holes 120 are formed at both ends of the center plate 100 in the longitudinal direction. When connecting the vehicle body, each fastening hole 120 is provided with a hinge extending from the vehicle body. The fastening hole 120 is provided with a guide pin 121 (see Figure 2 ).

[0050] The guide pin 121 is manufactured to have a length longer than a depth of the fastening hole 120 so as to protrude from the center plate 100. The guide pin 121 is made of steel having a strength equal to or higher than that of the center plate 100.

[0051] The fastening hole 120 may be formed so that its center is not located on the central axis of the center plate 100 in the longitudinal direction (see Figure 7 ). When the center of the fastening hole 120 is not aligned with the central axis of the center panel 100, the shortest distance from one side of the center panel 100 to the edge of the fastening hole 120 is greater than the shortest distance from the opposite side of the center panel 100 to the edge of the fastening hole 120. When the hinge presses the side of the center panel 100 having a larger distance, the space for the shape deformation of the center panel 100 is reduced compared to the case where the sides of the shortest distance between the side of the center panel 100 and the edge of the fastening hole 200 have the same distance. That is, as the area pressed by the hinge increases, the rigidity of the center panel 100 increases relatively. At least due to the above structure, the width of the central area of ​​the center panel 100 can be increased as needed. Therefore, the width of the center panel 100 surrounding the bonding area between the center panel 100 and the outer foam 200 can be increased, and the bonding strength can be increased.

[0052] The center panel 100 may be manufactured such that the radius of curvature of each corner is different from each other. The radius of curvature of each corner of the center panel 100 may be adjusted to optimize for vehicle body fastening.

[0053] Reference Figure 2 and Figure 4 , the outer foam 200 may be manufactured so that its surface is curved at least once (ie, the top surface of the central area of ​​the center plate 100 is raised) (see Figure 2 , Figure 3 ), or may be formed into a cylindrical shape (see Figure 4 ).

[0054] Reference Figure 8 In order to facilitate the vehicle body fixation of the bushing, the center plate 100 is tiltedly disposed on the outer foam 200 so that an imaginary first line segment L1 passing through both sides of the center plate 100 in the width direction (for example, passing through the centers of both sides of the center plate 100) and an imaginary second line segment L2 passing through both sides of the outer foam 200 in the width direction (for example, passing through the centers of both sides of the outer foam 200) do not overlap with each other.

[0055] The first line segment L1 and the second line segment L2 are disposed at an angle of 10°. The center panel 100 may be disposed obliquely on the outer foam 200, so that the first line segment L1 and the second line segment L2 form an angle of 10° or more or 10° or less in consideration of the shape of the vehicle body and the shape of the trailing arm.

[0056] Reference Fig. 9 , a bonding material is provided in a central region of the center panel 100 where the center panel 100 and the outer foam 200 contact each other. The bonding material may be provided on both sides of the center panel 100. The bonding material may be provided as a bonding film 130 that is melted by heating during injection molding of the material to form the outer foam 200. As a result, the center panel 100 made of the steel material and the outer foam 200 made of the plastic material are bonded to each other.

[0057] In addition to the bonding film 130, any material that melts by heat, for example, non-metallic materials (synthetic resins) such as bonding agents and resins, and metallic materials such as silver solder can be used as the bonding material. The bonding material can be selected to have a lower melting point than the outer foam 200 so that when the outer foam 200 is formed on the surface of the center plate 100 by injection molding, the bonding material can be easily melted.

[0058] The composite material bushing according to the embodiment of the present invention constructed as above can be Fig.10 The procedure shown is used to manufacture. Fig.10 As shown, the composite material bushing according to the embodiment of the present invention is manufactured by producing a center panel 100 constituting the center of the core of the composite material bushing (S100) and forming an outer foam 200 made of a different kind of material on the outside of the center panel 100 (S200).

[0059] According to one example, in the step S100 of producing the center panel 100, the center panel 100 is produced by press molding or extrusion molding. In the forming of the outer foam 200 (S200), the outer foam 200 is formed on the outside of the center panel 100 by injection molding.

[0060] In the production of the center plate 100 (S100), a hole 110 is formed at the center of the center plate 100 to prevent the outer foam 200 from being separated from the center plate 100. In addition, the center area of ​​the center plate 100 may be bent at least once (i.e., the top surface of the center area of ​​the center plate 100 is raised) to prevent the outer foam 200 from being separated from the center plate 100. A bonding material may be provided in the center area of ​​the center plate 100. The bonding material may be a material that is melted by heat provided during injection molding to form the outer foam 200 (S200). When the bonding material is melted, the center plate 100 and the outer foam 200 are bonded to each other.

[0061] In the production of the center plate 100 (S100), fastening holes 120 are respectively formed at both ends of the center plate 100 in the longitudinal direction so that the centers of the fastening holes 120 are not located on the central axis of the center plate 100 in the longitudinal direction. In addition, each corner of the center plate 100 is processed to have a different radius of curvature.

[0062] In the forming of the outer foam 200 (S200), the outer foam 200 is formed by injection molding around at least the center portion of the center panel 100 so that an imaginary first line segment L1 passing through both sides of the center panel 100 in the width direction and an imaginary second line segment L2 passing through both sides of the outer foam 200 in the width direction do not overlap with each other. The center panel 100 is obliquely mounted on a machine for injection molding the outer foam 200 so that the center panel 100 can be obliquely disposed on the outer foam 200.

[0063] According to the composite material bushing including the core according to the embodiment of the present invention constructed as above, the center plate 100 is made of a material having strength, so that the strength of the center of the core and the strength of the end of the core can be uniformly provided. In particular, since the outer foam 200 made of plastic having high processability is provided outside the center plate 100, the outer foam 200 can have the same shape as the conventional core, or have an appropriate shape according to the shape of the connecting rod to be applied.

[0064] In addition, since the center plate 100 is obliquely disposed on the outer foam 200, vehicle body fastening is easy. Since the fastening holes 120 are disposed at both ends of the center plate 100 to have an offset, the area of ​​the center plate 100 increases and the rigidity increases. The bonding strength between the center plate 100 and the outer foam 200 increases. In addition, since the curvature radii of the corners of the center plate 100 are set to be different from each other, the curvature radii can be variably applied so as to be optimized for vehicle body fastening. Therefore, the productivity, reliability and quality of the bushing can be ensured.

[0065] On the other hand, the performance of the bushing is determined by the stiffness and performance of the rubber. The stiffness and performance of the rubber depend on the shape and material of the rubber. The rubber is firmly bonded to the outer iron material and the outer foam 200. The shape of the rubber is determined by the shape of the outer iron material and the outer foam 200.

[0066] In order to ensure the free performance of the rubber, the shape of the outer foam 200 should be freely set. The material of the outer foam 200 should be easily adapted to the deformed shape. That is, the processability should be high. In order to freely set the shape of the outer foam 200, it is preferred to perform injection molding as described above. As described above, examples of the material of the outer foam 200 suitable for injection molding include plastic, aluminum, magnesium, etc.

[0067] The center plate 100 can ensure rigidity, and the outer foam 200 made of plastic, aluminum or magnesium material can be formed in a desired shape on the surface of the center plate 100. Therefore, according to one embodiment of the present invention, a bushing suitable for any connecting rod existing in a vehicle can be manufactured.

Claims

1. A composite material bushing comprising a core having a central portion and end portions, wherein: The core comprises: center panel; and an outer foam which is formed outside the center panel to surround the center panel and is made of different kinds of materials, wherein the center of the fastening hole of the center plate is arranged not to be located on the central axis of the center plate in the longitudinal direction, thereby increasing the width of the center plate surrounding the bonding area between the center plate and the outer foam to increase the bonding strength between the center plate and the outer foam; The center plate is obliquely disposed on the outer foam to facilitate fixing of the bushing to the vehicle, wherein an imaginary first line segment passing through both sides of the center plate in the width direction and an imaginary second line segment passing through both sides of the outer foam in the width direction do not coincide with each other.

2. The composite material bushing according to claim 1, wherein: A hole is provided at the center of the center panel to prevent the outer foam from being separated from the center panel.

3. The composite material bushing according to claim 2, wherein: A pin is mounted in the hole, the length of the pin being greater than the thickness of the center plate and less than the thickness of the outer foam.

4. The composite material bushing according to claim 1, wherein: The center region of the center panel is bent at least once to prevent the outer foam from separating from the center panel.

5. The composite material bushing according to claim 1, wherein: A hole is provided at the center of the center plate to prevent the outer foam from being separated from the center plate, and a central area of ​​the center plate is bent at least once.

6. The composite material bushing according to claim 1, wherein: Anti-separation jaws are provided at the edges of the center plate to prevent the outer foam from being separated from the center plate.

7. The composite material bushing according to claim 6, wherein: The center plate has a rectangular shape, and The separation preventing jaws are provided on either one of the long edges of the center plate to face each other.

8. The composite material bushing according to claim 6, wherein: The center plate has a rectangular shape, and The anti-separation jaws are provided by cutting inward from the outer sides of the long edges of the center plate.

9. The composite material bushing according to claim 1, wherein: The center panel and the outer foam optionally include a material having a target strength or ductility in a metal or non-metal.

10. The composite material bushing according to claim 1, wherein: The center plate includes a steel material that provides uniform strength throughout the center of the core to the ends of the core, and The outer foam is disposed outside the center panel and includes a plastic material.

11. The composite material bushing according to claim 1, wherein: A fastening hole is provided at each end in the longitudinal direction of the center plate.

12. The composite material bushing according to claim 11, wherein: A guide pin is provided at the fastening hole.

13. The composite material bushing according to claim 1, wherein: The radius of curvature of each corner of the center plate is different from each other.

14. The composite material bushing according to claim 1, wherein: A bonding material is disposed on a central region of the center panel in contact with the outer foam.

15. The composite material bushing according to claim 1, wherein: The imaginary first line segment and the imaginary second line segment form an angle of 10° or greater.

16. The composite material bushing according to claim 14, wherein: The bonding material is disposed on both sides of the center panel.

17. The composite material bushing according to claim 1, wherein: An imaginary first line segment passing through the center of both sides of the center plate in the width direction and an imaginary second line segment passing through the center of both sides of the outer foam in the width direction do not coincide with each other.

18. A method of manufacturing a composite material liner, the composite material liner comprising a core, the core comprising a center panel and an outer foam disposed outside the center panel, the method comprising: Performing press forming or extrusion forming on a steel material to form the center plate; providing a bonding material in a central portion of the center panel where at least a portion of the center panel contacts the outer foam; as well as performing injection molding of a material to form the outer foam, thereby melting the bonding material and bonding the center panel to the outer foam, wherein the center of the fastening hole of the center plate is arranged not to be located on the central axis of the center plate in the longitudinal direction, thereby increasing the width of the center plate surrounding the bonding area between the center plate and the outer foam to increase the bonding strength between the center plate and the outer foam; The center plate is obliquely disposed on the outer foam to facilitate fixing of the bushing to the vehicle, wherein an imaginary first line segment passing through both sides of the center plate in the width direction and an imaginary second line segment passing through both sides of the outer foam in the width direction do not coincide with each other.

19. The method according to claim 18, wherein: The melting point of the steel material forming the center plate is higher than the melting point of the material forming the outer foam, and the melting point of the material forming the outer foam is higher than the melting point of the bonding material.

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