Sealing strip facilitating installation of decoration strip, automobile door and automobile

Abstract

A sealing strip facilitating installation of a decoration strip comprises a sealing strip body and the decoration strip, a mushroom head is integrally formed on the sealing strip body, and the decoration strip is inserted into a sealing strip groove. A hard layer is arranged at the top end of the mushroom head. When the decorative strip is assembled, the decorative strip firstly touches the hard layer, and the hard layer is high in overall hardness and is not easy to deform, so that the defect that the decorative strip is difficult to mount and assemble when a traditional mushroom head structure is not provided with a coating is overcome, and the defect that the decorative strip is easy to fall off after being mounted is also overcome. Furthermore, the sealing strip is installed on the automobile door.

Description

Technical Field

[0001] The present application relates to the field of automobile sealing strips, and in particular to a sealing strip that is convenient for installing decorative strips. Background Art

[0002] European guide groove sealing strips have been widely used in recent years because they can add metal bright strips to the top strips, and match the side panels, water cuts, rear side windows, etc. of the vehicle body to form a circle of high-gloss black or matte aluminum decorative effects, thereby improving the grade of the entire vehicle. At the same time, they can match the doors to add half-way sealing, which can also improve the NVH of the entire vehicle.

[0003] In the prior art, those skilled in the art often use 3M tape to attach the bright strip (i.e., the decorative strip) to the sealing strip body to ensure the matching strength. This assembly method has exposed a serious drawback in long-term use:

[0004] At present, the matching types of decorative strips and guide groove sealing strips can be divided into snap-on structure, integrated extrusion structure, and adhesive structure. The defects of these three forms are as follows: 1) The adhesive structure has complex process, weak stability, high cost, and dependence on special equipment for adhesive bonding. In addition, 3M tape is easy to age. In the later period, as the adhesion of 3M tape decreases, the bright strip is easy to loosen or even fall off, causing customer complaints; 2) The process of the integrated extrusion structure is complex and the scrap rate is high. The brightness of the appearance of the bright decorative parts after high-temperature vulcanization will be affected; 3) Although the snap-on structure is widely used and the process is simple, since the guide groove sealing strip is made of EPDM or TPV material and has certain elastic properties, no matter which type of snap-on method is used, after the guide groove sealing strip is snap-on and assembled with the bright decorative parts, it is inevitable that there will be problems of elastic rebound and poor fastening matching after being installed on the body with a certain curvature in the width direction of the body, especially at the two ends, which are more likely to have a gap phenomenon, affecting the appearance, easy to fall off, and performance failure.

[0005] CN101935865A discloses a double fixed structure of a bright strip and a sealing strip corner, wherein the bright strip is connected to the sealing strip corner by a buckle at the outermost side, and the sealing strip corner is provided with an insert; the projection shape of the bright strip on the horizontal plane is a fishhook shape, including a middle section and two curved hooks; the upper left corner of the horizontal projection of the sealing strip corner has a first long hook, the direction of the first long hook is outward, and the lower left corner of the horizontal projection is provided with a second long hook, the direction of the second long hook is inward. The defect of this design is that before installing the bright strip, the buckle must be installed on the sealing strip body, and then the bright strip must be pressed into the designated position with a large force and stuck, which is a cumbersome step and prone to errors. In addition, the life of the plastic buckle is generally not as good as that of the rubber sealing strip body, and the buckle ruptures after long-term use, which can easily cause the bright strip to fall off.

[0006] The bright strip of CN207670328U is assembled with the main body in a mushroom head style. The bright strip is provided with inwardly curled edges on both sides, which are embedded in the card slots, and the convex strip (i.e., mushroom head) is provided with a through hole inside. Although this design solves the installation and adaptation problem of the bright strip to a certain extent, the mushroom head is generally soft, and the OEM has complicated steps when assembling the bright strip. The technician needs to open the end cover at one end of the sealing strip first, and then pinch the mushroom head as a whole and slowly insert the bright strip. During this period, it is necessary to ensure that the cross section of the bright strip will not scratch the mushroom head. After the insertion is completed, the end cover is installed again. In addition, because the mushroom head is soft, the installation technician is very likely to pull out the bright strip by mistake, and the pull-out force of the bright strip is even lower than 80N, which is difficult to meet the technical requirements of the OEM.

[0007] To this end, the present application will disclose a novel assembly scheme of a decorative strip and a sealing strip, which facilitates the insertion of the decorative strip by strengthening both ends of the mushroom head and improves the extraction force of the decorative strip to prevent the decorative strip from falling off. Summary of the invention

[0008] The present application designs a sealing strip that is convenient for installing decorative strips, so as to solve the defects of the decorative strips in the prior art, such as difficulty in installing and easy falling off, etc. The sealing strip is further applied to automobile doors and automobiles.

[0009] In order to achieve the above purpose, this application adopts the following technical solutions:

[0010] A sealing strip for facilitating installation of a decorative strip, comprising a sealing strip body and a decorative strip, wherein a mushroom head is integrally formed on the sealing strip body, and the decorative strip is inserted into a sealing strip groove;

[0011] A hard layer is arranged on the top of the mushroom head.

[0012] Furthermore, a connecting portion is provided between the top ends, and the connecting portion is recessed downwards.

[0013] Furthermore, a lip is provided on the sealing strip body, which clamps the decorative strip together with the mushroom head.

[0014] Furthermore, a through hole is arranged inside the mushroom head.

[0015] Furthermore, the hard layer is made of polyethylene material.

[0016] Furthermore, the hard layer is an ultra-high hardness EPDM rubber wear-resistant material.

[0017] Furthermore, no hard layer is provided on the side end of the mushroom head.

[0018] Furthermore, two ends of the decorative strip are provided with circular hooks.

[0019] A vehicle door is provided with any one of the above-mentioned sealing strips.

[0020] A car is provided with the above-mentioned car door.

[0021] Compared with the prior art, the advantages and positive effects of this application are:

[0022] The present application creatively sets a hard layer on the top of the mushroom head. The decorative strip touches the hard layer first during assembly. Since the hard layer has a large overall hardness and is not easily deformed, the disadvantage of the difficulty in assembling the decorative strip when the traditional mushroom head structure is not coated is overcome. The installer only needs to refer to Figure 3-5 The decorative strip can be easily inserted into the groove of the sealing strip by the following assembly steps. At the same time, when the traditional structure is installed on a car body with a certain curvature in the width direction of the car body, there will be problems such as elastic rebound and poor fastening matching, especially the two ends are more likely to be separated, resulting in the defect of the decorative strip falling off. In this application, when the installed decorative strip wants to be pulled out, the hard layers at both ends will generate a downward oblique support force to prevent the decorative strip from falling out, thereby achieving a more secure installation effect of the decorative strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a sealing strip structure of the present application.

[0024] Figure 2 This is a partial enlarged view of the sealing strip of this application.

[0025] Figure 3 , Figure 4 , Figure 5 This is a schematic diagram of the installation steps of the decorative strips for this application.

[0026] Legend: 1. Sealing strip body; 11. Lip; 12. Groove; 2. Mushroom head; 21. Through hole; 22. Top end; 23. Hard layer; 24. Side end; 25. Connecting part; 3. Decorative strip; 31. Reciprocating hook; 4. Sheet metal; 5. Frame. DETAILED DESCRIPTION

[0027] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict. At the same time, other structures of the sealing strip in the drawings not mentioned in the specification are only for illustration and do not constitute any other form of technical limitation on the technical solution of the present application.

[0028] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the present application is not limited to the specific embodiments of the following disclosure.

[0029] The decorative strip 3 may be made of metal, including but not limited to aluminum alloy, stainless steel, etc., or may be made of plastic or other hard materials.

[0030] Please refer to the attached Figure 1-2 , Figure 2 yes Figure 1 A partial enlarged view. An inverted U-shaped frame 5 is provided inside the sealing strip body 1, and a plurality of sealing teeth are provided inside the U-shaped groove, which are used to clamp the door sheet metal 4 to prevent the sealing strip from falling off. A mushroom head 2 is provided at the bottom end of the inverted U-shaped frame 5, and the mushroom head 2 is integrally formed with the sealing strip body 1. The mushroom head 2 is provided with a through hole 21, and the compression deformation of the mushroom head 2 facilitates the assembly of the decorative strip 3, which helps to improve production efficiency.

[0031] An important function of designing the mushroom head 2 is to facilitate the installation of the decorative strip 3. The decorative strip 3 is C-shaped as a whole and is inserted into the grooves 12 at both ends of the mushroom head 2. The two ends of the decorative strip 3 can be provided with circular hooks 31 to prevent the sharp metal parts at both ends from scratching the sealing strip body 1. The groove 12 is provided between the side end 24 of the mushroom head 2 and the lip 11 or body of the sealing strip.

[0032] When the decorative strip 3 is inserted into the grooves 12 at both ends of the mushroom head 2 , the design of the lip edge 11 can increase the clamping of the decorative strip 3 to a certain extent, thereby preventing the decorative strip 3 from falling off.

[0033] Furthermore, the portion above the through hole 21 of the mushroom head 2 is approximately in an "M" shape, with a top 22 structure provided at the left and right ends, and a connecting portion 25 is provided between the two tops 22 for natural connection and transition. As a preferred design, the connecting portion 25 is slightly concave downward, one of the functions of which is to facilitate the deformation of the connecting portion 25 by squeezing the concave point downward under the action of external force.

[0034] As a preferred option, a hard layer 23 is provided on the top 22. The hard layer 23 is attached to the top 22 and is co-extruded with the sealing strip, or the hard layer 23 is attached after the sealing strip is extruded. The thickness of the hard layer 23 is preferably 20 μm-0.1 mm, and the hardness is preferably ≥ 65 degrees (Shore hardness).

[0035] Both top ends 22 of the mushroom head 2 may be provided with a hard layer 23, or only one top end 22 may be provided with a hard layer 23. Alternatively, the mushroom head 2 may have multiple top ends 22, and those skilled in the art are fully motivated to provide a hard layer 23 on multiple top ends 22 of the mushroom head 2 after reading the technical solution of this application.

[0036] As a further option, the two side ends 24 of the mushroom head 2 should not be provided with a hard layer 23 to avoid affecting the insertion of the decorative strip 3. This is because the insertion of the decorative strip 3 requires the side ends 24 and the connecting portion 25 of the mushroom head 2 to be squeezed and deformed toward the through hole 21, and the side ends 24 will also be deformed at this time. If the side ends 24 are also provided with a hard layer 23 at this time, the squeeze deformation cannot be generated, resulting in difficulty in assembling the decorative strip 3 and affecting production efficiency.

[0037] Please read further Figure 3-5 , these three figures are used to show the insertion process of the decorative strip 3, but the deformation of the mushroom head 2 is not shown. It should be noted that in actual production and assembly, the decorative strip 3 can be first inserted into the groove 1212 from the right side and then the left side of the decorative strip 3 is pressed so that the decorative strip 3 on the left side is also inserted into the groove 12, or it can be first inserted into the groove 12 from the left side and then the right side of the decorative strip 3 is pressed so that the decorative strip 3 on the right side is also inserted into the groove 12, or it can be pressed down or pressed in the middle of the decorative strip 3 at the same time so that the left and right sides of the decorative strip 3 are simultaneously inserted into the groove 12 to complete the assembly.

[0038] Design principle: The present application creatively sets a hard layer 23 on the top 22 of the mushroom head 2. The decorative strip 3 first touches the hard layer 23 during assembly. Since the hard layer 23 has a large overall hardness and is not easily deformed, the disadvantage of the difficulty in assembling the decorative strip 3 when the traditional mushroom head 2 structure is not coated is overcome. The installer only needs to refer to Figure 3-5 The decorative strip 3 can be easily inserted into the groove 12 of the sealing strip by the following assembly steps. At the same time, when the traditional structure is installed on a vehicle body with a certain curvature in the width direction of the vehicle body, there will be problems such as elastic rebound and poor fastening matching, especially the two ends are more likely to be separated, resulting in the defect of the decorative strip 3 falling off. In the present application, when the installed decorative strip 3 wants to be pulled out, the hard layers 23 at both ends will generate a downward oblique support force to prevent the decorative strip 3 from falling out, thereby achieving a more secure installation effect of the decorative strip 3.

[0039] Comparative example: The top end 22 of the mushroom head 2 is not provided with the hard layer 23 .

[0040] Embodiment 1: The hard layer 23 can be a thermoplastic material such as polyethylene, which is extruded together with the sealing strip and the mushroom head 2. Specifically, during extrusion compounding, the thermoplastic material such as polyethylene is melted in the extruder and then squeezed into a flat die. After the sheet-like film flows out, it is immediately compounded with the sealing strip body 1 through a cooling roller and a compounding roller. Although the processing cost is low, the loss is large when heating and replacing the resin, and the extrusion flatness is also poor, and the quality control is difficult. It should be noted that this solution can solve the technical problems raised by the background technology of this application.

[0041] In addition, polyethylene needs to be extruded using a special mold and plastic extruder, and then bonded to the sealing strip substrate with a bonding device. If any problem occurs in any process, waste will be generated, and the fault tolerance rate is low. Due to the different heating time and temperature of polyethylene and EPDM rubber, there will often be obvious color differences between the two products after extrusion. At the same time, due to the characteristics of polyethylene materials and the large number of processes, the surface of the extruded polyethylene belt has many irregular bumps, indentations or scratches, which affect the appearance of the product. As a result, the sealing strips produced by this process can only be used in generally invisible parts such as the inside of the guide groove, and are exposed to the outside, affecting the appearance of the entire vehicle. Because this kind of polyethylene material is wear-resistant and high-temperature resistant, the temperature of the extruder head needs to be adjusted to above 200°C during the production process to achieve smooth extrusion. However, since the distance between the PE extruder head and the EPDM extruder head is relatively close, the heat conduction effect will transfer the high temperature to the EPDM extruder head (usually around 70°C), and there is a certain probability that the EPDM extruder head will cause dead glue (that is, under the influence of high temperature, the EPDM has not been extruded at the head or is being extruded, it is vulcanized and shaped in advance) and blockage, affecting the production efficiency of the product.

[0042] Embodiment 2: As a further preferred solution, the hard layer 23 is an ultra-high hardness EPDM wear-resistant material. The formula of the ultra-high hardness EPDM wear-resistant material described in this application refers to any embodiment of Chinese patent application CN117186524A, preferably embodiment 18, that is, EPDM: 100 parts, ultra-high molecular weight polyethylene: 350 parts, carbon black: 25 parts, paraffin oil: 15 parts, sulfur: 1 part.

[0043] When ultra-high hardness EPDM wear-resistant material is used, since the wear-resistant material and the sealing strip body 1 are made of the same or similar materials, the temperature of the mold during extrusion only needs to be around 75°C, and the extrusion temperature of the EPDM substrate is similar, far from the temperature required for EPDM vulcanization (about 140-180°C). There is no need to set up a heat insulation mechanism, the mold structure is simpler, and the dead glue phenomenon during the extrusion process no longer occurs. As the specification clarifies, the hardness of the ultra-high hardness EPDM wear-resistant material described in this application is a Shore hardness ≥ 85 degrees, and a more preferred hardness is a Shore hardness ≥ 95 degrees.

[0044] The pull-out force test method and specific test requirements are as follows:

[0045] 1) Instruments: tensile testing machine, tooling (the cross-sectional shape of the sealing strip fixing tooling is designed according to the installation matching cross-sectional structure, the matching surface of the tooling and the sealing strip needs to be painted, and the tooling length is 100mm), and fixture (length 120mm);

[0046] 2) Sample requirements: The same section of the sealing strip requires three samples to be cut from the same position on different finished products, and the sample length is 120mm;

[0047] 3) Test method: Install the specimen into the test fixture according to the design section matching requirements, so that the exposed lengths at both ends of the test fixture are similar. Install the fixture on the tensile testing machine, clamp the specimen with a fixture, pull out the specimen at a speed of 50 mm / min, and record the force value when the specimen is pulled out. Repeat 3 times for each sample, and take the minimum value as the specimen pull-out force. The final test result is the average of the pull-out forces of the three specimens.

[0048] Pull-out force test results:

[0049] Spline Name Test results (N) Compare Spline 1 67 Contrast Spline 2 72 Contrast Spline 3 63 Comparison of spline means 67.3 Example 1 of the present application 135 Example 1 of the present application 147 Example 1 of the present application: Spline 3 145 Average value of Example 1 of the present application 142.3 Example 2 of the present application: Spline 1 204 Example 2 of the present application 217 Example 2 of the present application 223 Average value of Example 2 of this application 214.6

[0050] From the above table, we can see that the decorative strips 3 of Example 1 and Example 2 with the hard layer 23 have a greater pull-out force, that is, the force required to remove the decorative strips 3 is greater, and more energy is required, so that the installation of the decorative strips 3 is more secure.

[0051] From the perspective of assembly speed, the time required for assembly of each sealing strip in comparative example 1 is about 40-60 seconds; the time required for assembly of each sealing strip using an adhesive structure is about 45-70 seconds, which is mainly due to the increased time for bonding and removing the protective film; the time required for assembly of each sealing strip using a snap-fit ​​structure is about 50-80 seconds, which is mainly due to the increased time required for installing and aligning the snap-fit ​​structure; the time required for assembly of each sealing strip in embodiment 1 of the present application is about 15-25 seconds, which is mainly because the hard layer 23 plays a role to a certain extent, but the composite degree of the PE layer and the rubber layer is generally not high, which makes it difficult to install the decorative strip 3 in place at one time during installation; the time required for assembly of each sealing strip in embodiment 2 of the present application is about 5-15 seconds, and the installer can easily insert the decorative strip 3 into the groove 12 of the sealing strip accurately under the guidance and support of the hard layer 23 at one time, and the installation is firm, and the probability of subsequent rework is small. However, the assembly speed of any embodiment is significantly faster than that of the traditional comparative example.

[0052] The fixing method of the decorative strip of the present application is a mushroom head with a hard layer, so that the decorative strip is not easy to fall out of the sealing strip body. Compared with the traditional mushroom head design without a hard layer, the clamping force is greater and it is easy to install and firmly installed. It avoids the problem that the decorative strip is co-extruded with the rubber material as a metal skeleton at the same time. Due to structural limitations, the width of the bright surface is small and the upper and lower parts are edged with black rubber, which does not look grand and beautiful. The traditional mushroom head design without a hard layer is also to assemble the bright strip after the main body is extruded, but after assembly, the retention force is small due to structural design defects, and the bright strip is easy to fall out of the main body. After the guide groove is loaded, cracks or warping problems are likely to occur between the bright strip and the main body, affecting the appearance and taste of the product. The mushroom head adopts a hollow design, which is easy to assemble and improve production efficiency. The technical solution of the present application successfully overcomes the defects of the traditional mushroom head without a hard layer, which has a large assembly force and is difficult to assemble together.

[0053] The above is only a preferred embodiment of the present application and does not constitute any other form of limitation to the present application. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present application without departing from the content of the technical solution of the present application still falls within the protection scope of the technical solution of the present application.

Claims

1. A sealing strip for facilitating installation of a decorative strip, comprising a sealing strip body (1) and a decorative strip (3), characterized in that: The sealing strip body (1) is provided with a mushroom head (2) in an integral manner, and the decorative strip (3) is inserted into the sealing strip groove (12); A hard layer (23) is provided on the top end (22) of the mushroom head (2).

2. A sealing strip for facilitating installation of decorative strips according to claim 1, characterized in that: A connecting portion (25) is provided between the top ends (22), and the connecting portion (25) is recessed downwards.

3. A sealing strip for facilitating installation of decorative strips according to claim 1, characterized in that: The sealing strip body (1) is provided with a lip edge (11) which, together with the mushroom head (2), clamps the decorative strip (3).

4. A sealing strip for facilitating installation of decorative strips according to claim 1, characterized in that: A through hole (21) is provided inside the mushroom head (2).

5. A sealing strip for facilitating installation of decorative strips according to claim 1, characterized in that: The hard layer (23) is made of polyethylene material.

6. A sealing strip for facilitating installation of decorative strips according to claim 1, characterized in that: The hard layer (23) is an ultra-high hardness EPDM rubber wear-resistant material.

7. A sealing strip for facilitating installation of decorative strips according to claim 1, characterized in that: The side end (24) of the mushroom head (2) is not provided with a hard layer (23).

8. The sealing strip for facilitating installation of decorative strips according to claim 1, characterized in that: Both ends of the decorative strip (3) are provided with circular hooks (31).

9. A vehicle door provided with the sealing strip according to any one of claims 1 to 8.

10. An automobile provided with the door according to claim 9.

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