EPDM sealing and sound deadening component for a through-lit tail light and vehicle

Abstract

The utility model discloses a kind of EPDM sealing sound insulation components and vehicle for through type tail light, EPDM sheet produced by supercritical closed-cell foaming process, the EPDM sheet has micro-nano level closed-cell structure, density is 55-750 kg / m³, hardness is 15-70 shore C, compression permanent deformation rate is not more than 5%;The EPDM sheet one side is attached with environment-aging-resistant pressure-sensitive adhesive layer, the other side is sealing contact surface;The sealing sound insulation component is formed with the shape of through type tail lamp vehicle body joint surface by die cutting processing Adaptation. By the above-mentioned mode, the utility model can effectively prevent rain and dust intrusion of through type tail lamp long joint surface, significantly improve the safety of driving in rainy days, provide long-acting sealing solution for through type tail lamp;Vehicle can be realized at 120km / h speed, and indoor noise is not higher than 57dB (A), 60km / h speed is not higher than 53.2dB (A), 3-5dB (A) lower than mainstream electric vehicle, reach library level mute level, reduce driving fatigue, significantly sound insulation noise reduction performance, improve driving comfort.

Description

Technical Field

[0001] This utility model relates to the field of sealing material manufacturing, and in particular to an EPDM sealing and sound insulation component for a through-type taillight and a vehicle. Background Technology

[0002] As a signature element of modern automotive design, continuous taillights have been widely adopted in numerous models. This design, through a slender light strip spanning the rear of the vehicle, not only significantly enhances the vehicle's visual width and sense of luxury but also improves nighttime driving safety through dynamic lighting effects. With the integration of laser matrix and OLED technologies, continuous taillights have become an important vehicle for showcasing technological attributes. However, this design also presents unique technical challenges—since the light body is typically over 1.5 meters long, the perimeter of its sealing interface with the vehicle body often exceeds 3.6 meters, and it needs to adapt to the curved shapes of different vehicle models. This places extremely high demands on the performance of sealing materials and installation processes.

[0003] Currently, the industry mainly uses two sealing solutions, both of which have significant drawbacks. While sealant-based solutions can adapt to irregular joint surfaces, they require uniform application and precise control of the sealant thickness; too thick or too thin a layer will affect the sealing effect. More seriously, the sealant forms a rigid connection after curing, making subsequent repairs and replacements extremely difficult. The other low-cost, ordinary foam solution suffers from insufficient material sealing reliability, easily leading to water leakage and noise intrusion at the joint surface. Actual measurements show that at a vehicle speed of 120 km / h, the interior noise can reach 64 dB(A), severely impacting driving comfort. Furthermore, existing sealing materials have poor aging resistance, requiring replacement every 2-3 years, and are prone to twisting and misalignment during installation, failing to meet the assembly precision and efficiency requirements of automotive assembly lines. Utility Model Content

[0004] The main technical problem solved by this utility model is to provide a low-cost, long-term reliable sealing EPDM sealing and sound insulation component and vehicle for through-type taillights that can effectively reduce vehicle noise, is easy to install, and has controllable precision.

[0005] To solve the above-mentioned technical problems, one technical solution adopted by this utility model is: to provide an EPDM sealing and sound insulation component for a through-type taillight, comprising: an EPDM sheet produced by supercritical closed-cell foaming process, wherein the EPDM sheet has a micro-nano closed-cell structure, a density of 55-750 kg / m³, a hardness of 15-70 Shore C, and a compression set of no more than 5%; The EPDM sheet has an environmentally resistant pressure-sensitive adhesive layer bonded to one side, and a sealed contact surface on the other side. The sealing and sound insulation component is formed by die-cutting to match the surface of the body that is connected to the through taillight.

[0006] In a preferred embodiment of this utility model, the thermal conductivity of the EPDM sheet is not higher than 0.032 W / (m·K), and the volume resistivity is not lower than 10^16 Ω·cm.

[0007] In a preferred embodiment of this utility model, the perimeter of the sealing and sound insulation component is increased by 10%-15% relative to the perimeter of the mating surface, and this compensation is configured to adapt to changes in the curvature of the rear of the vehicle and installation deformation.

[0008] In a preferred embodiment of this utility model, the operating temperature range of the sealing and sound insulation component is -40°C to 150°C, and its performance remains stable after being immersed in high-temperature steam for 100 hours.

[0009] In a preferred embodiment of this utility model, the sealing and sound insulation component is formed by die-cutting to match the mating surface of the through taillight, including a snap-on or threaded mounting structure.

[0010] In a preferred embodiment of this utility model, the thickness of the sealing and sound insulation component is 3-8mm, and the closed-cell rate is 85%-98%, which is used to ensure that the in-vehicle noise at a speed of 120km / h is not higher than 57dB(A).

[0011] To solve the above-mentioned technical problems, another technical solution adopted by this utility model is: to provide a vehicle equipped with the sealing and sound insulation component as described above, wherein the sealing and sound insulation component is continuously arranged along the joint surface between the through-type taillight and the vehicle body.

[0012] The beneficial effects of this utility model are as follows: This utility model uses the supercritical closed-cell foaming process of EPDM material to form a micro-nano-level closed-cell structure, which makes the sealing component have high elasticity (compression permanent deformation rate ≤5%) and uniform sealing pressure, effectively preventing rain and dust intrusion at the long joint surface of the through taillight, solving the leakage problem of traditional sealant or foam, significantly improving driving safety in rainy weather, and providing a long-term sealing solution for through taillights.

[0013] The closed-cell structure and low thermal conductivity of the sealing components effectively block noise transmission. This achieves in-vehicle noise levels no higher than 57 dB(A) at 120 km / h and no higher than 53.2 dB(A) at 60 km / h, a reduction of 3-5 dB(A) compared to mainstream electric vehicles, reaching library-level quietness, reducing driver fatigue, significantly improving sound insulation and noise reduction performance, and enhancing ride comfort.

[0014] After the sealing components are bonded to the environmentally resistant pressure-sensitive adhesive, they are die-cut into shape, achieving one-time precision processing. No complicated processes are required during installation, which greatly improves assembly efficiency and solves the problems of slow assembly and difficult maintenance of traditional solutions, meeting the high-paced requirements of automobile manufacturing. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein: Figure 1 This is a schematic diagram of a preferred embodiment of the EPDM sealing and sound insulation component for a through-type taillight according to the present invention.

[0016] Figure 2 This is a top view of the EPDM sealing and sound insulation component for a through-type taillight, according to this utility model. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0018] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0020] In the description of this utility model, it should be noted that the terms "front," "rear," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They 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 on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" 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.

[0022] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] Please see Figure 1 and Figure 2 , This utility model embodiment includes: an EPDM sealing and sound insulation component for a through-type taillight, comprising: an EPDM sheet 1 produced by supercritical closed-cell foaming process, wherein the EPDM sheet has a micro-nano closed-cell structure, a density of 55-750 kg / m³, a hardness of 15-70 Shore C, and a compression set of no more than 5%.

[0024] The EPDM sheet 1 has an environmentally resistant pressure-sensitive adhesive layer 2 bonded to one side, and a sealing contact surface on the other side. The sealing and sound insulation component is die-cut to form a shape that fits the body surface of the through taillight, including a snap-on or threaded installation structure.

[0025] Supercritical closed-cell foaming process uses supercritical fluids (such as CO2 or N2) as foaming agents to generate independently distributed closed-cell structures, enabling the material to achieve stress values ​​of 80-150 kPa at a 25% compression rate, making it suitable for high-load scenarios.

[0026] Pressure-sensitive adhesive layer 2 has aging resistance properties, ensuring bonding stability in humid, ultraviolet and other environments.

[0027] The die-cutting process accuracy is controlled within ±0.2mm to ensure a seamless fit between the parts and the mating surfaces.

[0028] The perimeter of the sealed sound insulation component is increased by 10%-15% relative to the perimeter of the mating surface. This compensation is configured to accommodate changes in the curvature of the vehicle's rear end and installation deformation. The compensation is achieved through a die-cutting process, and combined with the high elasticity of EPDM material, it can absorb deformation caused by thermal expansion and contraction or vehicle vibration.

[0029] The sealed sound insulation components operate within a temperature range of -40°C to 150°C and maintain stable performance after immersion in high-temperature steam for 100 hours. The materials have undergone accelerated aging tests to verify their durability in extreme environments, meeting automotive industry standards.

[0030] The thickness of the sealed sound insulation components is 3-8mm, and the closed-cell rate is 85%-98%, which is used to ensure that the in-vehicle noise at a speed of 120km / h is not higher than 57dB(A).

[0031] Another embodiment of this utility model includes: a method for preparing an EPDM sealing and sound insulation component for a through-type taillight, comprising the following steps: a. Provide EPDM sheets 1 and double-sided release paper pressure-sensitive tape 2 produced by supercritical closed-cell foaming process; b. Bond the EPDM sheet 1 to the pressure-sensitive tape 2 under a pressure of 0.1-0.5 MPa, ensuring no air bubbles are present; c. Use precision die-cutting to cut composite materials, and process sealing and sound insulation components in one step to adapt to the joint surface shape of different vehicle models; d. Inspect, package, and store the finished products.

[0032] Among them, EPDM sheet 1 produced by supercritical closed-cell foaming process has the following performance advantages: (1) Excellent environmental temperature resistance and mechanical durability: The working temperature range is extended to -40℃~150℃. After being immersed in high-temperature steam for 100 hours, the performance remains stable. It has passed 1 million scraping tests and is resistant to ozone aging, ensuring the sealing reliability during long-term use in vehicles. (2) Thermal and sound insulation performance with low thermal conductivity: The closed-cell structure effectively blocks heat conduction, with a thermal conductivity as low as 0.032 W / (m·K), while the volume resistivity is not less than 10¹ 6 Ω·cm, providing excellent insulation, suitable for sound insulation needs in automotive taillight sealing scenarios; (3) Environmental protection and safety performance: The physical foaming process avoids chemical crosslinking agent residue, has low VOC emissions, and the material is recyclable, meeting the environmental protection standards of the automotive industry, such as ISO 14000.

[0033] The above performance parameters have been verified through accelerated aging tests and industry standard tests, enabling the sealed sound insulation components to achieve the beneficial effects of waterproofing, sound insulation and noise reduction in the long joint surface application of through-type taillights.

[0034] Another embodiment of this utility model includes: a vehicle equipped with the above-mentioned sealing and sound insulation component, wherein the sealing and sound insulation component is continuously arranged along the joint surface between the through-type taillight and the vehicle body.

[0035] During implementation, first clean the mating surfaces of the vehicle body, then peel off the pressure-sensitive adhesive release paper, directly paste the components, and press to ensure a proper fit. A continuous arrangement covering the entire circumference of the taillights avoids leakage points associated with segmented sealing. The installation process requires no additional tools or curing time, significantly improving assembly line efficiency. The reliable sealing results in reduced in-vehicle noise, lower energy consumption for electric vehicles, and improved comfort.

[0036] This invention utilizes the supercritical closed-cell foaming process of EPDM material to form a micro-nano-level closed-cell structure, enabling the sealing component to have high elasticity (compression permanent deformation rate ≤5%) and uniform sealing pressure. This effectively prevents rain and dust intrusion at the long joint surface of the through-type taillight, solves the leakage problem of traditional sealant or foam, significantly improves driving safety in rainy weather, and provides a long-lasting sealing solution for through-type taillights.

[0037] The closed-cell structure and low thermal conductivity of the sealing components effectively block noise transmission. This achieves in-vehicle noise levels no higher than 57 dB(A) at 120 km / h and no higher than 53.2 dB(A) at 60 km / h, a reduction of 3-5 dB(A) compared to mainstream electric vehicles, reaching library-level quietness, reducing driver fatigue, significantly improving sound insulation and noise reduction performance, and enhancing ride comfort.

[0038] After the sealing components are bonded to the environmentally resistant pressure-sensitive adhesive, they are die-cut into shape, achieving one-time precision processing. No complicated processes are required during installation, which greatly improves assembly efficiency and solves the problems of slow assembly and difficult maintenance of traditional solutions, meeting the high-paced requirements of automobile manufacturing.

[0039] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An EPDM sealing and sound insulation component for a through-type taillight, characterized in that, include: EPDM sheets produced by supercritical closed-cell foaming process have a micro-nano scale closed-cell structure, a density of 55-750 kg / m³, a hardness of 15-70 Shore C, and a compression set of no more than 5%. The EPDM sheet has an environmentally resistant pressure-sensitive adhesive layer bonded to one side, and a sealed contact surface on the other side. The sealing and sound insulation component is formed by die-cutting to match the surface of the body that is connected to the through taillight.

2. The EPDM sealing and sound insulation component for a through-type taillight according to claim 1, characterized in that, The thermal conductivity of the EPDM sheet is not higher than 0.032 W / (m·K), and the volume resistivity is not lower than 10^16 Ω·cm.

3. The EPDM sealing and sound insulation component for a through-type taillight according to claim 1, characterized in that, The perimeter of the sealing and sound insulation component is increased by 10%-15% relative to the perimeter of the mating surface, and this compensation is configured to adapt to changes in the curvature of the rear of the vehicle and installation deformation.

4. The EPDM sealing and sound insulation component for a through-type taillight according to claim 1, characterized in that, The sealed sound insulation components operate in a temperature range of -40°C to 150°C and maintain stable performance after being immersed in high-temperature steam for 100 hours.

5. The EPDM sealing and sound insulation component for a through-type taillight according to claim 1, characterized in that, The sealing and soundproofing components are die-cut to form a shape that matches the mating surface of the through taillight, including adaptable snap-on and threaded mounting structures.

6. The EPDM sealing and sound insulation component for a through-type taillight according to claim 1, characterized in that, The thickness of the sealed sound insulation components is 3-8mm, and the closed-cell rate is 85%-98%, which is used to ensure that the in-vehicle noise at a speed of 120km / h is not higher than 57dB(A).

7. A vehicle, characterized in that: The device is equipped with a sealing and sound insulation component as described in any one of claims 1-6, the sealing and sound insulation component being continuously arranged along the mating surface between the through-type taillight and the vehicle body.

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