A front sealing strip for engine hood

Abstract

A front sealing strip for an engine hood, relating to the field of automotive sealing technology, includes a rubber strip body with a buffer cavity in the middle. The rubber strip body includes a mounting part and side connecting parts connected to its opposite sides. A lower connecting part is also provided on the lower side of the mounting part, connecting between the side connecting parts. The lower connecting part includes a downwardly curved lower convex section, with upwardly curved upper convex sections connected to its two sides. The end of the upper convex section connects to the side connecting part. A side convex section is provided on the inner side of the side connecting part corresponding to the lower side of the upper convex section, and the lower side of the lower convex section is lower than the lower side of the side convex section. This sealing strip forms a multi-layer sealing structure through the hierarchical layout of the lower, upper, and side convex sections. The central buffer cavity provides ample deformation buffer space for each protruding structure. Combined with the elastic mechanical properties of the rubber strip body, it can disperse compressive stress, significantly improving the sealing strip's deformation resistance and resilience, and helping to protect engine compartment parts from water and dust corrosion.

Description

Technical Field

[0001] This utility model relates to the field of automotive sealing technology, specifically to a front sealing strip for an engine hood. Background Technology

[0002] The sealing strip at the front of the engine hood is used to block water, dust, noise and other external elements from the engine compartment. Most existing sealing strips are hollow structures with a cross-sectional shape of D or B. Their sealing pressure is concentrated, and after long-term heavy pressure from the engine hood, they often have poor resistance to deformation. Over time, they are not easy to spring back after deformation, which reduces their dustproof and waterproof performance and affects engine compartment parts. Utility Model Content

[0003] To address the technical problems existing in the background art, this utility model provides a front sealing strip for an engine hood.

[0004] The technical solution of this utility model is as follows:

[0005] A front sealing strip for an engine hood includes a rubber strip body with a buffer cavity in the middle. The rubber strip body includes a mounting part and side connecting parts that are respectively connected to its opposite two sides. The mounting part also has a lower connecting part connected between the two side connecting parts. The lower connecting part includes a downwardly curved lower convex section. The two sides of the lower convex section are respectively connected to an upwardly curved upper convex section. The end of the upper convex section is connected to the side connecting part. The inner side of the side connecting part is provided with a side convex section corresponding to the lower side of the upper convex section, and the lower side of the lower convex section is lower than the lower side of the side convex section.

[0006] Furthermore, the middle part of the side joint bends outward toward the buffer cavity.

[0007] Furthermore, the rubber strip body has a pressure-reducing cavity at least in the middle of the convex section.

[0008] As one implementation method, the cross-sectional shape of the decompression cavity is circular / rectangular / trapezoidal.

[0009] To facilitate processing, the two sides are symmetrically arranged along the vertical central axis of the rubber strip body.

[0010] To improve the stability of the connection between the adhesive backing and the mounting part, a receiving groove is provided on the upper side of the mounting part. The adhesive backing is provided in the receiving groove, and the width of the opening side of the receiving groove is smaller than the width of the bottom of the groove.

[0011] As described above, the front sealing strip of the engine hood has a release paper covering the adhesive backing. The release paper is a thin plastic sheet structure, with its two side edges extending beyond the two side edges of the receiving groove and located inside the two side edges of the mounting part. This facilitates the removal of the release paper during use and prevents the two side edges of the release paper from extending beyond the two side edges of the mounting part and being accidentally removed during transportation.

[0012] Furthermore, the cross-sectional shape of the rubber strip body is a trapezoid with a width on the upper side greater than that on the lower side.

[0013] Furthermore, all outer edges of the rubber strip body are rounded, and the rubber strip body is integrally extruded from EPDM rubber.

[0014] The sealing strip of this invention forms a multi-layered sealing structure through a hierarchical layout of lower, upper, and side convex sections. When the hood is closed, the lower convex section first adheres to the vehicle body, and the upper and side convex sections on both sides successively form secondary sealing barriers. This results in a gradient increase in pressure on the sealing surface from the center to both sides, avoiding localized pressure concentrations common in traditional structures and eliminating sealing blind spots. This ensures that the entire contact area between the sealing strip and the vehicle body is within the effective sealing pressure range. Simultaneously, the central buffer cavity provides ample deformation buffer space for each protruding structure. Combined with the elastic mechanical properties of the rubber strip itself, it can disperse compressive stress, significantly improving the sealing strip's deformation resistance and resilience. Thus, this synergistic design of multi-layered sealing, gradient pressure, and buffer energy release fundamentally reduces the risk of seal failure after long-term use, helping to protect engine compartment parts from water and dust corrosion. Attached Figure Description

[0015] In the attached diagram:

[0016] Figure 1 This is a schematic diagram of the cross-sectional structure of a front sealing strip for an engine hood according to this embodiment;

[0017] Figure 2 for Figure 1 A magnified structural diagram at point A;

[0018] Figure 3 for Figure 1 A magnified structural diagram at point B;

[0019] The components represented by the various reference numerals in the diagram are:

[0020] 1. Rubber strip body; 11. Mounting part; 12. Side connection part; 121. Side convex section; 122. Bending section; 123. Pressure relief cavity; 13. Lower convex section; 14. Upper convex section; 15. Receiving groove; 2. Buffer cavity; 3. Backing adhesive; 4. Release paper. Detailed Implementation

[0021] Combination Figure 1 This embodiment provides a front sealing strip for an engine hood, including a rubber strip body 1, adhesive backing 3, and release paper 4. In use, the release paper 4 is peeled off to expose the adhesive backing 3, and then the adhesive backing 3 is used to bond the strip to the front edge of the engine hood. When the engine hood is closed, the bottom of the sealing strip contacts the vehicle body to achieve a seal.

[0022] Specifically, the rubber strip body 1 has a buffer cavity 2 in the middle. The rubber strip body 1 is a hollow structure integrally extruded from EPDM rubber. The rubber strip body 1 includes an installation part 11 and side connection parts 12 connected to its opposite sides. The installation part 11 also has a lower connection part connected between the two side connection parts 12. The lower connection part includes a downwardly curved lower convex section 13. The two sides of the lower convex section 13 are respectively connected to an upwardly curved upper convex section 14. The end of the upper convex section 14 is connected to the side connection part 12. The inner side of the side connection part 12 is provided with a side convex section 121 corresponding to the lower side of the upper convex section 14. The lower side of the lower convex section 13 is lower than the lower side of the side convex section 121.

[0023] When the hood is closed, the downward-curving arc structure of the lower convex section 13 first fits against the vehicle body, and the upper convex sections 14 on both sides are first deformed into the buffer cavity 2 under pressure, transmitting the initial pressure to the buffer cavity 2; then the side convex section 121 is pressed, and a secondary pressure superposition is formed by squeezing the upper convex section 14, while deforming into the buffer cavity 2 to generate lateral pressure. The upper convex section 14 and the side convex section 121 form a secondary sealing barrier in sequence, so that the pressure on the sealing surface increases gradually from the middle to both sides. This avoids the local pressure concentration of the traditional structure and eliminates the sealing blind spot, ensuring that the entire contact area between the sealing strip and the vehicle body is within the effective sealing pressure range.

[0024] Meanwhile, the central buffer cavity 2 provides ample deformation buffer space for each protruding structure. Combined with the excellent elastic recovery rate and aging resistance of the rubber strip body 1, the upper protruding section 14 and the side protruding section 121 can bend into the buffer cavity 2 when compressed, avoiding material fatigue caused by rigid extrusion. It can also disperse the extrusion stress and significantly improve the deformation resistance and resilience of the sealing strip. Thus, this synergistic design of multi-seal, gradient pressure and buffer energy release reduces the risk of seal failure after long-term use from the root, and helps protect cabin parts from water and dust corrosion.

[0025] To further improve the sealing effect, the middle part of the side connection portion 12 bends outward towards the buffer cavity 2, and the width of the bend in the middle part of the side connection portion 12 is greater than the width of the mounting portion 11, forming a wrap-around protection for the mounting portion 11. The edge of the bent side connection portion 12 can extend to the outer edge of the mounting portion 11, forming a physical barrier to prevent water and dust from laterally intruding into the adhesive 3 area. This allows it to further conform to the side of the vehicle body after being pressed, supplementing the lateral seal and forming a third barrier. Furthermore, the bend of the middle part of the side connection portion 12 towards the outer side of the buffer cavity 2 makes the elastic deformation path of the side connection portion 12 smoother, reducing local seal failure caused by stress concentration due to rigid bending, thereby stably maintaining the lateral sealing effect of the third barrier.

[0026] The rubber strip body 1 has a pressure-reducing cavity 123 at least in the middle of the side protrusion section 121. Through the cooperation between the pressure-reducing cavity 123 and the buffer cavity 2, the stress can be evenly distributed in the entire sealing strip structure, which can effectively avoid deformation damage caused by local stress concentration.

[0027] Furthermore, with the cooperation of the buffer chamber 2 and the pressure-reducing cavity 123, the residual stress accumulated by the material during multiple deformation processes is released, further extending the service life of the sealing strip and enabling it to maintain good resilience and sealing performance during long-term use.

[0028] The cross-sectional shape of the decompression cavity 123 is circular / rectangular / trapezoidal, preferably circular.

[0029] To facilitate processing, the two side joints 12 are symmetrically arranged with respect to the vertical central axis of the rubber strip body 1, and the rubber strip body 1 as a whole has a symmetrical structure along the vertical central axis.

[0030] Combination Figure 2 The upper side of the mounting part 11 is provided with a receiving groove 15, and the adhesive 3 is placed in the receiving groove 15. This not only improves the connection stability between the adhesive 3 and the mounting part 11, but also prevents rainwater from seeping along the edge of the adhesive 3 through the groove wall. In addition, the width of the opening side of the receiving groove 15 is smaller than the width of the bottom of the groove, which further enhances the firmness of the connection between the adhesive 3 and the sealing strip body.

[0031] Combination Figure 3 The adhesive backing 3 is covered with release paper 4. Release paper 4 is a thin plastic sheet structure. The two sides of release paper 4 extend beyond the two sides of the opening of the receiving groove 15 and are located inside the two sides of the mounting part 11. This makes it easy to peel off the release paper 4 during use and prevents the two sides of release paper 4 from being accidentally peeled off during transportation because they extend beyond the two sides of the mounting part 11.

[0032] Combination Figure 1 Overall, the cross-sectional shape of the rubber strip body 1 is a trapezoid with a wider upper section than lower section. The wider upper section connects to the mounting section 11, forming a stable load-bearing base. The narrower lower section forms a contraction guide channel through the inner wall of the buffer cavity 2. When the vehicle body squeezes the lower and side protrusions, the inclination angle of the trapezoid constrains the deformation direction, forcing stress to concentrate and release towards the inside of the cavity rather than diffuse to the sides, reducing irreversible deformation caused by unintended twisting. All outer and inner edges of the rubber strip body 1 are rounded. Rounded corners can disperse local stress (especially during repeated deformation, avoiding stress concentration at right angles that could lead to material fatigue tearing), extending the service life of the sealing strip. The rounded corner design of its outer edge optimizes the fluid path through the curved surface. Rainwater slides quickly down along the rounded corners when it flows through, reducing the residence time on the edges and the deposition of dust particles on the edges.

Claims

1. A front sealing strip for an engine hood, characterized in that, Includes a rubber strip body (1) with a buffer cavity (2) in the middle; The rubber strip body (1) includes an installation part (11) and side connecting parts (12) respectively connected to its opposite two sides, and the lower side of the installation part (11) is also provided with a lower connecting part connected between the two side connecting parts (12); The lower part includes a downwardly curved lower convex section (13), and the two sides of the lower convex section (13) are respectively connected to an upwardly curved upper convex section (14), and the end of the upper convex section (14) is connected to the side part (12). The inner side of the side connection (12) is provided with a side protrusion (121) corresponding to the lower side of the upper protrusion (14), and the lower side of the lower protrusion (13) is lower than the lower side of the side protrusion (121).

2. The engine hood front sealing strip as described in claim 1, characterized in that, The middle part of the side connection (12) bends outward toward the buffer cavity (2).

3. The engine hood front sealing strip as described in claim 1, characterized in that, The rubber strip body (1) has a pressure relief cavity (123) at least in the middle of the lateral convex section (121).

4. The engine hood front sealing strip as described in claim 3, characterized in that, The cross-sectional shape of the decompression cavity is circular / rectangular / trapezoidal.

5. The engine hood front sealing strip as described in claim 1, characterized in that, The two side joints (12) are symmetrically arranged with respect to the vertical central axis of the rubber strip body (1).

6. The engine hood front sealing strip as described in claim 1, characterized in that, The mounting part (11) has a receiving groove (15) on its upper side, and the receiving groove (15) is provided with adhesive (3), and the width of the opening side of the receiving groove (15) is smaller than the width of the bottom of the groove.

7. The engine hood front sealing strip as described in claim 6, characterized in that, The adhesive backing (3) is covered with release paper (4), the two sides of the release paper (4) extend beyond the two sides of the opening of the receiving groove (15) and are located inside the two sides of the mounting part (11).

8. A front sealing strip for an engine hood as described in any one of claims 1-7, characterized in that, The cross-sectional shape of the rubber strip body (1) is a trapezoid with a width on the upper side greater than that on the lower side.

9. A front sealing strip for an engine hood as described in any one of claims 1-7, characterized in that, All outer edges of the rubber strip body (1) are rounded.

10. A front sealing strip for an engine hood as described in any one of claims 1-7, characterized in that, The rubber strip body (1) is integrally extruded from EPDM rubber.

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