High-foaming expansion rubber block for automobile

Abstract

The utility model relates to the field of expansion rubber blocks, and particularly discloses a high-foaming expansion rubber block for an automobile, which comprises a framework layer and a foaming layer, a boss is arranged on the end face of the side, facing the foaming layer, of the framework layer. A barb structure is arranged on the side face of the boss. The foaming layer is provided with grooves corresponding to the bosses, and the barb structures are embedded into the foaming layer. Convex-concave mortise and tenon joint splicing structures are arranged at the two ends of the framework layer, and a positioning pin and a magnetic attraction structure are integrated on the side, facing the automobile body metal plate, of the framework layer so that the framework layer can be fixed to the automobile body metal plate. And through the composite structural design of the framework layer and the foaming layer, mortise and tenon joint splicing and magnetic attraction fixing are combined, and the installation stability and the anti-seismic property of the rubber block can be effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of expanding rubber blocks, and in particular to a high-foaming expanding rubber block for automobiles. Background Technology

[0002] High-density foamed rubber expansion blocks are commonly used for filling the gaps between the inner and outer panels of automobiles, and can also be used on engine hoods, doors, trunk lids, and other areas. As a new type of sound insulation and vibration damping material, expansion blocks achieve both sealing and vibration damping by foaming and expanding to fill gaps in the vehicle body.

[0003] Existing automotive expansion joints are mostly made of a single foaming material, which results in poor stability when connected to the body sheet metal, insufficient shock resistance, and low installation efficiency. Some products are fixed by adhesive or clips, but these are prone to aging and falling off, and cannot be repositioned. In addition, traditional joints lack modular splicing designs, making it difficult to adapt to the assembly requirements of different vehicle models. Utility Model Content

[0004] The purpose of this invention is to provide a high-foaming expansion adhesive block for automobiles, in order to solve the technical problems of poor stability in connection with the body sheet metal, insufficient shock resistance, and low installation efficiency in the prior art.

[0005] To solve the above problems, the present invention provides a high-foaming expansion block for automobiles, which adopts the following technical solution: including a skeleton layer and a foaming layer;

[0006] The skeleton layer has a boss on the side facing the foam layer, and the side of the boss has a barb structure.

[0007] The foam layer has grooves corresponding to the bosses, and barbs are embedded in the foam layer;

[0008] The two ends of the skeleton layer are provided with a convex-concave mortise and tenon joint structure. The side of the skeleton layer facing the body sheet metal is integrated with positioning pins and magnetic structure to fix the skeleton layer to the body sheet metal.

[0009] Furthermore, the mortise and tenon joint structure includes a tenon located at one end of the skeleton layer and a limiting groove located at the other end of the skeleton layer. The tenon and the limiting groove are matched, and the tenon and the groove are arranged asymmetrically.

[0010] Furthermore, both the cross-section and longitudinal section of the tenon are trapezoidal.

[0011] Furthermore, the mortise and tenon joint structure is integrally formed with the skeleton layer, and the surface of the mortise and tenon joint structure is coated with a wear-resistant coating.

[0012] Furthermore, the tail of the locating pin is equipped with a flexible buckle, which is interference-fitted with the locating hole on the body sheet metal.

[0013] Furthermore, the magnetic structure includes a mounting groove located on the side of the skeleton layer facing the body sheet metal, and a magnetic block fitted into the mounting groove.

[0014] Furthermore, the magnetic block is a neodymium iron boron permanent magnet, which corresponds to the ferromagnetic positioning plate pre-installed on the body sheet metal.

[0015] Furthermore, the skeleton layer has a honeycomb structure and is made of a composite material of polyamide resin and glass fiber. The surface of the skeleton layer is coated with a flame-retardant and thermally conductive coating.

[0016] Furthermore, the foam layer comprises two sets: an upper foam layer and a lower foam layer. The upper and lower foam layers are located on the upper and lower sides of the skeleton layer, respectively. The upper foam layer is made of flame-retardant EVA, and the lower foam layer is made of self-adhesive EPDM rubber.

[0017] Furthermore, the foam layer and the skeleton layer are hot-pressed together.

[0018] The beneficial effects of the high-foaming expansion rubber block for automobiles provided by this utility model are:

[0019] 1. When the skeleton layer and the foam layer are combined, the barb structure is embedded in the groove of the foam layer, which can form a mechanical interlock, making the connection strength between the skeleton layer and the foam layer higher. At the same time, it can effectively disperse stress and reduce stress concentration.

[0020] 2. The asymmetrical mortise and tenon joint structure can effectively resist various vibrations and impacts, prevent the joints from loosening or separating, effectively improve installation efficiency, and effectively avoid installation problems caused by incorrect splicing direction; the magnetic structure and positioning pins work together to form a double fixing mechanism, which is convenient to operate and can enhance the connection strength between the frame layer and the body sheet metal.

[0021] 3. The upper and lower foam layers work together to absorb and disperse energy, and the foam layers can fill the gaps between body parts, providing a good sealing effect. At the same time, its porous structure can effectively absorb sound waves and reduce the propagation of noise. Attached Figure Description

[0022] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0023] Figure 1 This is a cross-sectional structural diagram of a high-foaming expansion rubber block for automobiles according to the present invention.

[0024] Figure 2 This is a cross-sectional structural diagram of the skeleton layer of a high-foaming expansion rubber block for automobiles according to the present invention.

[0025] Figure 3 This is a top view schematic diagram of the skeleton layer of a high-foaming expansion rubber block for automobiles according to the present invention.

[0026] Figure 4 This is a side view of the skeleton layer of a high-foaming expansion rubber block for automobiles according to the present invention.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Skeleton layer; 11. Boss; 111. Barb structure; 12. Tenon; 13. Limiting groove; 14. Positioning pin; 141. Elastic buckle; 15. Magnetic structure; 151. Mounting groove; 152. Magnetic block;

[0029] 2. Foam layer; 21. Groove; 22. Upper foam layer; 23. Lower foam layer. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0031] The number of any elements in the accompanying drawings is for illustrative purposes only and not as a limitation, and any naming is for distinction only and has no limiting meaning.

[0032] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0033] This utility model provides a high-foaming expansion rubber block for automobiles, such as... Figures 1 to 4 As shown, it includes a skeleton layer 1 and a foam layer 2.

[0034] In this embodiment, a boss 11 is provided on the end face of the skeleton layer 1 facing the foam layer 2, and a barb structure 111 is provided on the side of the boss 11. The foam layer 2 is provided with a groove 21 corresponding to the boss 11, and the barb structure 111 is embedded in the foam layer 2. In this embodiment, when the skeleton layer 1 and the foam layer 2 are combined, the barb structure 111 is embedded in the groove 21 of the foam layer 2, which can form a mechanical interlock. It can provide fixing force and constraint force in the direction perpendicular to the connection surface and in the horizontal direction, so that the connection strength between the skeleton layer 1 and the foam layer 2 is higher. This can effectively prevent relative sliding or separation between the foam layer 2 and the skeleton layer 1, ensuring the stability of the connection. At the same time, it can effectively disperse stress, reduce stress concentration, and avoid fatigue damage at the connection point, thereby improving the fatigue resistance of the adhesive block and extending its service life. Furthermore, the boss 11 and the groove 21 can play a positioning role during the installation process, allowing operators to quickly and accurately align and install the skeleton layer 1 and the foam layer 2 together, thereby effectively improving installation efficiency.

[0035] In this embodiment, the two ends of the skeleton layer 1 are provided with a "convex-concave" mortise and tenon joint structure. The mortise and tenon joint structure includes a protruding tenon 12 located at one end of the skeleton layer 1 and a limiting groove 13 located at the other end of the skeleton layer 1. The protruding tenon 12 and the limiting groove 13 are matched. In this embodiment, when it is necessary to splice the skeleton layers 1 of multiple glue blocks together, it is only necessary to insert the protruding tenon 12 of one skeleton layer 1 into the limiting groove 13 of another skeleton layer 1 to complete the splicing. The splicing method is simple and easy to implement, does not require additional connectors, and can effectively improve installation efficiency.

[0036] In this embodiment, the tenon 12 and the limiting groove 13 adopt an asymmetrical layout, meaning that the shape, size, or position of the tenon 12 and the limiting groove 13 are not completely symmetrical at both ends of the skeleton layer 1. This ensures that during the splicing process, the splicing can only be completed when the tenon 12 and the limiting groove 13 are correctly aligned. This effectively avoids installation problems caused by incorrect splicing direction, thereby improving the accuracy and reliability of installation. Furthermore, the asymmetrical layout increases the fitting precision and friction between the tenon 12 and the limiting groove 13, making the spliced ​​skeleton layer 1 more robust. During vehicle operation, the rubber blocks are subjected to various vibrations and impacts. The asymmetrical mortise and tenon splicing structure can effectively resist these external forces, preventing the spliced ​​parts from loosening or separating.

[0037] In this embodiment, the cross-section and longitudinal section of the tenon 12 are both trapezoidal, which can effectively increase the friction and clamping force between the tenon 12 and the limiting groove 13, thereby effectively preventing the tenon 12 from coming out of the limiting groove 13, ensuring the stability of the splicing of the skeleton layer 1. In addition, the inclined side of the trapezoid can resist the lateral force to a certain extent. When the rubber block is subjected to the lateral external force, the inclined side of the trapezoidal tenon 12 and the side wall of the limiting groove 13 are squeezed against each other, generating a reverse force, thereby preventing lateral displacement between the skeleton layers 1.

[0038] In this embodiment, the mortise and tenon joint structure is integrally formed with the skeleton layer 1. During the vehicle's operation, the rubber block will be subjected to various complex forces and vibrations. The integrally formed structure can effectively resist these external forces and prevent the joint from breaking or loosening. Furthermore, the integrally formed structure allows the stress to be distributed more evenly throughout the skeleton layer 1 and the mortise and tenon joint structure, thereby effectively reducing the risk of excessive local stress and effectively improving the overall stability, reliability, and durability.

[0039] In this embodiment, the surface of the mortise and tenon joint structure is coated with a wear-resistant coating, which can effectively reduce wear on the surface of the mortise and tenon joint structure and prevent scratches, dents and other damage caused by long-term friction. In other embodiments, the wear-resistant coating can be in various forms such as polytetrafluoroethylene, electroplated hard chrome, or aluminum titanium nitride.

[0040] In this embodiment, the frame layer 1 has a positioning pin 14 and a magnetic structure 15 integrated on the side facing the body sheet metal to fix the frame layer 1 to the body sheet metal. In this embodiment, the magnetic structure 15 and the positioning pin 14 cooperate to form a dual fixing mechanism. The positioning pin 14 provides precise positioning and initial mechanical fixation, while the magnetic structure 15 further enhances the connection strength between the frame layer 1 and the body sheet metal through magnetic attraction, preventing the frame layer 1 from loosening due to vibration, impact, or other factors during use. Furthermore, during installation, the magnetic attraction can temporarily fix the frame layer 1 to the body sheet metal, allowing operators to easily fine-tune the position and angle of the frame layer 1 without the aid of other tools, ensuring installation quality.

[0041] In this embodiment, after the positioning pin 14 is inserted into the pre-set positioning hole on the body sheet metal, it restricts the degrees of freedom of the skeleton layer 1 in multiple directions, providing a stable reference for subsequent fixing operations. Furthermore, the positioning pin 14 enables rapid positioning, effectively shortening installation time. Simultaneously, it ensures the accurate relative position between the skeleton layer 1 and the body sheet metal, guaranteeing the consistency and stability of the adhesive block installation. In other embodiments, the positioning pin 14 can be integrally formed with the skeleton layer 1 or be an insert, among other forms.

[0042] In this embodiment, the locating pin 14 is provided with an elastic buckle 141 at its tail, which is used to interfere with the locating hole on the body sheet metal. In this embodiment, the elastic buckle 141 has an annular inverted cone structure, the opening angle of the elastic buckle 141 is 15°, and the locking force with the sheet metal hole is ≥30N.

[0043] In this embodiment, the magnetic structure 15 includes a mounting groove 151 located on the side of the skeleton layer 1 facing the body sheet metal, and a magnetic block 152 fitted into the mounting groove 151. When the skeleton layer 1 approaches the body sheet metal, a magnetic attraction force is generated between the magnetic block 152 and the ferromagnetic positioning plate pre-placed on the body sheet metal, attracting the skeleton layer 1 to the body sheet metal. This can fix the skeleton layer 1 in a predetermined position to a certain extent, facilitating subsequent further fixing operations, and maintaining good contact and fixation between the skeleton layer 1 and the body sheet metal.

[0044] In this embodiment, the magnetic block 152 is a neodymium iron boron permanent magnet with a magnetic attraction force ≥15 N / cm. 2 This corresponds to the ferromagnetic positioning plate pre-installed on the body sheet metal.

[0045] In this embodiment, the surface of the skeleton layer 1 is coated with a flame-retardant and thermally conductive coating. The skeleton layer 1 has a honeycomb structure with a porosity ranging from 50% to 70%. While ensuring structural strength, it significantly reduces weight and can effectively isolate heat conduction. Combined with the flame-retardant and thermally conductive coating, it can realize the principle of bidirectional heat pipe, which can both prevent external heat from entering and quickly dissipate internal heat.

[0046] In this embodiment, the skeleton layer 1 is made of a composite material of polyamide resin and glass fiber, with a glass fiber content of 20%-35%, which can significantly improve the mechanical properties of polyamide resin.

[0047] In this embodiment, the foam layer 2 includes two sets, namely an upper foam layer 22 and a lower foam layer 23. The upper foam layer 22 and the lower foam layer 23 are located on the upper and lower sides of the skeleton layer 1, respectively. Both sides of the skeleton layer 1 are provided with protrusions 11. The protrusions 11 are fitted with the upper foam layer 22 and the lower foam layer 23. The positioning pin 14 penetrates the lower foam layer.

[0048] It should be noted that, in order to ensure the practicality of the adhesive block, the number and position of the boss 11, positioning pin 14, and magnetic block 152 need to be set according to the actual usage requirements.

[0049] In this embodiment, the foam layer 2 has good elasticity and cushioning performance. When the car is subjected to external impact or vibration, the upper and lower foam layers 2 can work together to absorb and disperse energy, reduce the vibration and impact force transmitted to the car body, thereby improving the comfort of the ride. In addition, the foam layer 2 can fill the gaps between the car body parts, play a good sealing role, and prevent dust, moisture and other substances from entering the car. At the same time, its porous structure can also effectively absorb sound waves, reduce the transmission of noise, and improve the quietness of the car.

[0050] In this embodiment, the upper foam layer 22 is made of flame-retardant ethylene-vinyl acetate copolymer (EVA). EVA itself has good elasticity. After being made into foam layer 2, its numerous micro-closed-cell structures can provide excellent cushioning performance. When the car is subjected to external impact or vibration, these closed-cell structures can undergo compression deformation, absorb and store energy, thereby reducing the impact on the internal structure of the car body. The flame-retardant EVA foam layer 2 can effectively suppress the spread of flames, making it safer. In addition, it has a certain sealing performance, which can fill the gap between the car body parts and the frame layer 1, preventing dust, moisture and other substances from entering the car body. At the same time, it can also absorb some sound waves, initially reducing the intensity of external noise entering the car body.

[0051] In this embodiment, the lower foam layer 23 is made of self-adhesive ethylene propylene diene monomer (EPDM) rubber. EPDM rubber has excellent elasticity and aging resistance, which allows the foam layer 2 to maintain good elasticity during long-term use, making it less prone to deformation and hardening. It can continuously play a buffering and shock-absorbing role. In addition, the self-adhesive design allows the lower foam layer 23 to be easily and firmly bonded to body sheet metal and other parts without the need for additional adhesives. This can effectively improve installation efficiency and sealing performance, and also ensure close contact between the foam layer 2 and body parts, reducing noise and vibration caused by loosening.

[0052] In this embodiment, the upper flame-retardant EVA foam layer 2 and the lower self-adhesive EPDM rubber foam layer 2 can absorb and disperse energy from different directions and angles when subjected to impact or vibration. The upper foam layer 22 first provides initial cushioning against the impact, while the lower foam layer 23 further absorbs the remaining energy, forming a multi-level buffer system that greatly improves the overall cushioning and shock absorption effect. Furthermore, the upper and lower foam layers 2 together fill the gaps between the vehicle body components, forming a double sealing barrier that effectively prevents the entry of external substances such as dust and moisture. At the same time, their absorption effects on sound waves are superimposed, which can more comprehensively reduce the propagation of noise at different frequencies, creating a quieter and more comfortable environment inside the vehicle.

[0053] In this embodiment, the foam layer 2 and the skeleton layer 1 are hot-pressed composite molded, and the interface peel strength is ≥2.5N / mm. When subjected to an external force perpendicular to the interface, the bonding interface can withstand a stress of more than 2.5N / mm without peeling, thus ensuring the durability, impact resistance and sealing performance of the adhesive block.

[0054] The present invention provides a high-foaming expansion adhesive block for automobiles, which, through the composite structure design of skeleton layer 1 and foaming layer 2, combined with mortise and tenon splicing and magnetic fixation, can effectively improve the installation stability and shock resistance of the adhesive block.

[0055] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0056] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. A high-foaming expanding rubber block for automobiles, characterized in that, include: Skeleton layer and foam layer; The skeleton layer has a boss on the side facing the foam layer, and the side of the boss has a barb structure. The foam layer has grooves corresponding to the bosses, and barbs are embedded in the foam layer; The two ends of the skeleton layer are provided with a convex-concave mortise and tenon splicing structure. The side of the skeleton layer facing the body sheet metal is integrated with positioning pins and magnetic structure to fix the skeleton layer to the body sheet metal.

2. The high-foaming expansion rubber block for automobiles according to claim 1, characterized in that, The mortise and tenon joint structure includes a tenon at one end of the skeleton layer and a limiting groove at the other end of the skeleton layer. The tenon and the limiting groove are matched, and the tenon and the groove are arranged asymmetrically.

3. The high-foaming expansion adhesive block for automobiles according to claim 2, characterized in that, The cross-section and longitudinal section of the tenon are both trapezoidal.

4. The high-foaming expansion adhesive block for automobiles according to claim 3, characterized in that, The mortise and tenon joint structure is integrally formed with the skeleton layer, and the surface of the mortise and tenon joint structure is coated with a wear-resistant coating.

5. The high-foaming expansion adhesive block for automobiles according to claim 1, characterized in that, The end of the locating pin is equipped with a flexible buckle, which is interference-fitted with the locating hole on the body sheet metal.

6. The high-foaming expanding adhesive block for automobiles according to claim 1, characterized in that, The magnetic structure includes a mounting groove located on the side of the skeleton layer facing the body sheet metal, and a magnetic block fitted into the mounting groove.

7. A high-foaming expanding adhesive block for automobiles according to claim 6, characterized in that, The magnetic block is a neodymium iron boron permanent magnet, which corresponds to the ferromagnetic positioning plate pre-installed on the body sheet metal.

8. The high-foaming expansion rubber block for automobiles according to claim 1, characterized in that, The skeleton layer has a honeycomb structure and is made of polyamide resin and glass fiber composite material. The surface of the skeleton layer is coated with a flame-retardant and thermally conductive coating.

9. A high-foaming expanding rubber block for automobiles according to any one of claims 1 to 8, characterized in that, The foam layer consists of two layers: an upper foam layer and a lower foam layer. The upper and lower foam layers are located on the upper and lower sides of the skeleton layer, respectively. The upper foam layer is made of flame-retardant EVA, and the lower foam layer is made of self-adhesive EPDM rubber.

10. A high-foaming expansion rubber block for automobiles according to claim 9, characterized in that, The foam layer and the skeleton layer are hot-pressed and composite molded.

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