A skeleton variable cross section structure

Abstract

This utility model discloses a variable cross-section skeleton structure, belonging to the field of automotive parts technology. It includes a sealing strip with grooves on it, and a skeleton corresponding to the grooves on the sealing strip. The skeleton has a U-shaped structure and symmetrically arranged slots along its length at equal intervals. The skeleton also has several symmetrically arranged positioning slots along its length at equal intervals. The variable cross-section skeleton product provided by this utility model, by symmetrically opening slots along its length at equal intervals, reduces stress concentration when the skeleton is bent into a closed structure by the sealing strip. Furthermore, during skeleton cutting, the slots can determine the cutting gap, preventing deformation of the skeleton during cutting. By first opening positioning slots on the skeleton and then extruding it, the cutting length can be automatically identified and automatically cut using the positioning slots, reducing the need for subsequent steel core extraction processes.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts technology, and specifically discloses a skeleton variable cross-section structure. Background Technology

[0002] Automotive sealing strips, such as door opening strips and trunk strips, typically incorporate a U-shaped metal skeleton co-extruded onto the sealing strip to enhance the bonding strength between the product and the sheet metal. Since the final shape of these products is a closed structure connected at both ends, after extrusion molding, the product needs to be cut to a fixed length, and then the two ends are bonded together using a specialized mold to achieve a complete seal and improve sealing performance. To ensure the strength of the joint, the skeleton material at the ends usually needs to be removed before bonding to eliminate internal stress at the joint and improve the bonding strength of the product.

[0003] For example, patent CN208198075U, published on 2018-12-07, discloses a car door opening sealing strip, which is installed on the periphery of the car body opening to seal the gap between the car door and the car body. The sealing strip includes: an installation part, which includes an integrally formed outer side wall, an inner side wall, and a bottom wall of the car body. The installation part has a U-shaped cross-section for snapping the sealing strip onto the periphery; a cover lip, which is integrally formed on the bottom wall of the installation part near the car body and extends toward the inner side of the car body. The cover lip has an arc-shaped cross-section; and a sealing part, which is integrally formed on the bottom wall of the installation part near the car door and extends toward the car door. The sealing part has an arc-shaped cross-section.

[0004] The shortcomings of existing automotive door opening strips, including the aforementioned patents, are that their skeleton material needs to be cut after the sealing strip is extruded. However, since the skeleton is completely covered by the sealing strip after extrusion, it is not easy to identify and it is difficult to achieve automated cutting. Furthermore, the skeleton material near the bonding position is not easy to remove before the sealing strip is bonded at both ends. Utility Model Content

[0005] The purpose of this invention is to provide a skeleton variable cross-section structure.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A variable cross-section skeleton structure includes a sealing strip with a groove. A skeleton is provided on the sealing strip at the position corresponding to the groove. The skeleton has a U-shaped structure and symmetrical slots are provided on the skeleton. The slots are equally spaced along the length of the skeleton. The skeleton is also symmetrically provided with a number of positioning slots, which are equally spaced along the length of the skeleton.

[0008] In the aforementioned variable cross-section skeleton structure, the dimension of the positioning groove along the length of the skeleton is equal to the distance between two adjacent grooves.

[0009] The aforementioned skeleton variable cross-section structure has a rectangular or pentagonal positioning groove.

[0010] The aforementioned variable cross-section skeleton structure has a groove that extends to the bottom edge of the skeleton.

[0011] The aforementioned skeleton variable cross-section structure has a slot including a rectangular part and a triangular part, with the corner of the triangular part away from the rectangular part being set close to the axis of symmetry of the skeleton.

[0012] The aforementioned variable cross-section skeleton structure also has stress guiding holes on the skeleton.

[0013] In the aforementioned skeleton variable cross-section structure, stress guiding holes and slots on the skeleton are alternately opened.

[0014] In the aforementioned skeleton variable cross-section structure, the stress guiding holes are diamond-shaped holes, and the stress guiding holes extend to both sides of the skeleton.

[0015] In the above technical solution, the variable cross-section skeleton structure provided by this utility model can reduce stress concentration when the skeleton is bent into a closed structure by symmetrically opening slots on the skeleton and opening the slots at equal intervals along the length of the skeleton. On the other hand, when cutting the skeleton, the cutting gap can be determined by the slots to avoid deformation of the skeleton during cutting. By first opening the positioning slot on the skeleton and then extruding it, the cutting length can be automatically identified and the cutting can be automated by using the positioning slot. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 A cross-sectional view of the sealing strip and the skeleton provided for an embodiment of this utility model;

[0018] Figure 2 A schematic diagram of the unfolded state of the skeleton provided in an embodiment of this utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the sealing strip after the ends are joined together, as provided in an embodiment of this utility model.

[0020] Figure 4 A schematic diagram of the skeleton provided for an embodiment of this utility model.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Sealing strip; 11. Groove; 12. First reverse tooth; 13. Second reverse tooth; 131. Reverse tooth head; 132. Reverse tooth root; 2. Skeleton; 21. Groove; 211. Rectangular part; 212. Triangular part; 213. Steel core tooth; 22. Stress guide hole; 23. Positioning groove; 3. Bubble tube; 4. Extension. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0024] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," and "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0025] like Figures 1-4 As shown in the figure, the present invention provides a skeleton variable cross-section structure, including a sealing strip 1, a groove 11 on the sealing strip 1, a skeleton 2 on the sealing strip 1 corresponding to the groove 11, the skeleton 2 having a U-shaped structure, and slots 21 symmetrically opened on the skeleton 2, the slots 21 being equally spaced along the length direction of the skeleton 2, and a plurality of positioning slots 23 symmetrically opened on the skeleton 2, the positioning slots 23 being equally spaced along the length direction of the skeleton 2.

[0026] The dimension of the positioning groove 23 along the length of the skeleton 2 is equal to the distance between two adjacent slots 21, that is, the positioning groove 23 is connected to the slots 21 on its two adjacent sides. In this embodiment, the positioning groove 23 is rectangular in shape, such as... Figure 2 As shown.

[0027] Specifically, this variable cross-section frame structure is used for sealing the door leaf frame, side windows, front and rear windshields, engine hood, and trunk lid. It includes a sealing strip 1 and a frame 2. The sealing strip 1 has a U-shaped groove 11. The frame 2 is U-shaped and located inside the sealing strip 1, with the frame 2 corresponding to the groove 11. This ensures the structural stability of the groove 11 on the sealing strip 1, facilitating the sealing strip 1's engagement with the corresponding position on the vehicle body. The initial form of the frame 2 is a rectangular sheet of metal, such as... Figure 2 As shown, the frame 2 has symmetrically arranged slots 21, the axis of symmetry of the slots 21 is parallel to the long side of the frame 2, and the slots 21 are evenly spaced along the length of the frame 2. This allows the portion of the frame 2 between two adjacent slots 21 to form steel core teeth 213. After the sealing strip 1 is extruded, the steel core teeth 213 support its sides to ensure that the grooves 11 on the sealing strip 1 can maintain a U-shaped state. During production, the slots 21 are punched out when the frame 2 is still a long strip of metal, and then it is pre-bent into a U-shaped cross-section. Figure 4 In addition to the state shown, the skeleton 2 is also provided with a number of positioning grooves 23 at equal intervals along its own length direction. The positioning grooves 23 are symmetrically arranged on both sides of the skeleton 2. That is, when the skeleton 2 is pre-bent into a U-shaped structure, the positioning grooves 23 are opened on the two straight sides of the U-shape. Furthermore, the positioning grooves 23 are opened at equal intervals along the length direction of the skeleton 2. The opening distance between two adjacent positioning grooves 23 in the length direction of the skeleton 2 is set according to the subsequent cutting length of the skeleton 2.

[0028] The variable cross-section skeleton structure provided by this utility model, by symmetrically opening slots 21 on the skeleton 2 and making the slots 21 equally spaced along the length direction of the skeleton 2, can reduce the stress concentration when the skeleton 2 is bent into a closed structure with the sealing strip 1. On the other hand, when cutting the skeleton 2, the cutting gap can be determined by the slots 21 to avoid deformation of the skeleton 2 during cutting. By opening positioning grooves 23 on the skeleton 2 and then extruding and molding, the cutting length can be automatically identified and the cutting can be automated by using the positioning grooves 23.

[0029] Furthermore, the slot 21 extends to the bottom edge of the skeleton 2.

[0030] Furthermore, the slot 21 includes a rectangular portion 211 and a triangular portion 212, with the corner of the triangular portion 212 away from the rectangular portion 211 being positioned close to the axis of symmetry of the skeleton 2.

[0031] Specifically, such as Figure 2 and Figure 4As shown, the U-shaped frame 2 includes two sides and a bottom side. The two ends of the bottom side are connected to a set of sides, thus forming a U-shape. The groove 21 extends to this bottom side and includes a rectangular portion 211 and a triangular portion 212. That is, the groove 21 is composed of a rectangle and a triangle. The side of the rectangle furthest from the triangle is the opening of the groove 21, while the corner of the triangle furthest from the rectangle is close to the axis of symmetry of the frame 2. This further enhances the stress-reducing effect of the groove 21. Furthermore, when cutting the frame 2 after the sealing strip 1 is extruded, only the bottom side of the U-shaped structure needs to be cut, making the operation more convenient. Preferably, as shown... Figure 4 As shown, the positioning groove 23 communicates with the rectangular portions 211 of the two adjacent slots 21, and the dimension of the positioning groove 23 along the long side of the rectangular portion 211 is ( Figure 2 The vertical dimension in the view is greater than the length of the long side of the rectangular part 211.

[0032] Optionally, unlike the above embodiments, the positioning groove 23 is rectangular or pentagonal. When the positioning groove 23 is rectangular, its structure is the same as that of the above embodiments. The positioning groove 23 can also be pentagonal. When the positioning groove 23 is pentagonal, the positioning groove 23 has the same structure as the groove 21, which is also composed of a rectangle and a triangle (not shown in the figure).

[0033] In another embodiment of this utility model, stress guiding holes 22 are also provided on the skeleton 2.

[0034] Furthermore, the stress guiding hole 22 and the slot 21 on the skeleton 2 are alternately opened.

[0035] Preferably, the stress guiding hole 22 is a rhomboid hole, and the stress guiding hole 22 extends to both sides of the skeleton 2.

[0036] Specifically, such as Figure 2 and Figure 4 As shown, stress guiding holes 22 are also provided on the frame 2 to reduce the stress on the frame 2 as it bends with the sealing strip 1. Figure 3 During the process shown, stress concentration occurs, and stress guiding holes 22 and slots 21 are alternately opened on the skeleton 2 to ensure the overall structural strength of the skeleton 2. Preferably, the stress guiding holes 22 are rhomboid holes, with the two acute angles of the rhomboid holes extending to the two sides of the skeleton 2. When the skeleton 2 changes from its initial flat state ( Figure 2 (State) Pre-bent into a U-shaped structure ( Figure 4 During the bending process, the sharp corners of the rhomboid hole can disperse the stress along the diagonal direction, avoiding local stress concentration (especially in the tensile and compressive areas during bending). Furthermore, due to the symmetry of the major and minor axes of the rhomboid hole, it can better adapt to the complex stress state during U-shaped bending (such as tension on the outside and compression on the inside), reducing material cracking.

[0037] In another embodiment of this utility model, a bubble tube 3 is fixedly connected to one side of the outer wall of the sealing strip 1.

[0038] Specifically, the bubble tube 3 is located between the door or trunk lid and the sheet metal stop, and has functions such as waterproofing, dustproofing, sound insulation, heat insulation, and shock absorption.

[0039] Furthermore, the groove 11 is provided with a first inverted tooth 12 and a second inverted tooth 13.

[0040] Furthermore, the second reverse tooth 13 includes a connected reverse tooth head 131 and a reverse tooth root 132. The reverse tooth root 132 is connected to the inner wall of the groove 11. The reverse tooth head 131 and the inner wall of the groove 11 are set at an acute angle. The free ends of the reverse tooth head 131 all face the bottom of the groove 11.

[0041] Specifically, by providing a first reverse tooth 12 and a second reverse tooth 13 in the groove 11, the clamping force of the two allows the sealing strip 1 body to be fixed to the sheet metal stop, such as... Figure 1 As shown in the figure, the first set of reverse teeth 12 is provided in three sets. The angle between the three sets of first reverse teeth 12 and the inner wall of the groove 11 is an acute angle. The second reverse teeth 13 include a connected reverse tooth head 131 and a reverse tooth root 132. The reverse tooth root 132 is connected to the inner wall of the groove 11. The angle between the reverse tooth head 131 and the inner wall of the groove 11 is greater than the angle between the reverse tooth root 132 and the inner wall of the groove 11. The free ends of the reverse tooth heads 131 all face the bottom of the groove 11, and the reverse tooth root 132 has a recessed yield point, thereby increasing the contact area between the sealing strip 1 body and the sheet metal stop, thus increasing the clamping force.

[0042] Furthermore, the sealing strip 1 is provided with an outwardly protruding extension 4.

[0043] Specifically, the extension 4 allows a water guide groove to be formed on the sealing strip 1, which facilitates the collection of water into a flow and its discharge to the outside.

[0044] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A skeleton variable cross-section structure, comprising a sealing strip, a groove formed on the sealing strip, and a skeleton disposed on the sealing strip corresponding to the groove, characterized in that, The skeleton has a U-shaped structure and symmetrical slots are provided on it. The slots are equally spaced along the length of the skeleton. The skeleton also has several symmetrical positioning slots, which are equally spaced along the length of the skeleton.

2. The skeleton variable cross-section structure according to claim 1, characterized in that, The dimension of the positioning groove along the length of the skeleton is equal to the distance between two adjacent grooves.

3. The skeleton variable cross-section structure according to claim 1, characterized in that, The positioning groove is rectangular or pentagonal.

4. The skeleton variable cross-section structure according to claim 1, characterized in that, The groove extends to the bottom edge of the skeleton.

5. A skeleton variable cross-section structure according to claim 2, characterized in that, The slot includes a rectangular part and a triangular part, with the corners of the triangular part away from the rectangular part positioned close to the axis of symmetry of the skeleton.

6. A skeleton variable cross-section structure according to claim 1, characterized in that, Stress guiding holes are also provided on the frame.

7. A skeleton variable cross-section structure according to claim 4, characterized in that, Stress-guiding holes and slots on the skeleton are alternately opened.

8. A skeleton variable cross-section structure according to claim 4 or 5, characterized in that, The stress guiding holes are diamond-shaped and extend to both sides of the skeleton.

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