FASTENING STRUCTURE FOR A HOLLOW ENSURE ELEMENT, A SENSOR AND A SEALING STRIP

Abstract

Sufficient holding force is ensured for a hollow wrap element after it has been fastened, while simultaneously reducing the force required to fasten the hollow wrap element to a flange, thereby improving workability during fastening. A hollow wrap element 1 comprises a first side wall section 10, a second side wall section 20, a connecting wall section 30, and a first retaining lip 51 and a second retaining lip 52, which are provided on an inner surface of the first side wall section 10. The first retaining lip 51 is connected to the first side wall section 10 via a thin wall section 53.The second retaining lip 52 is configured to have a curved shape, which is spaced apart from a base section 51a of the first retaining lip 51 towards a near side in an insertion direction of a flange 104 when the flange 104 is not inserted, and on the other hand is to be deformed into an elongated shape during the insertion of the flange 104 due to a pressure force through the flange 104, and is configured such that a tip end section of it engages between the base section 51a of the first retaining lip 51 and the inner surface of the first side wall section 10.

Description

CROSS-REFERENCE TO RELATED REGISTRATION This application claims priority from Japanese patent application No. 2025-026879, which was filed on February 21, 2025, and the entire disclosure of which is hereby incorporated by reference. TECHNICAL AREA The present disclosure relates to a fastening structure for a hollow envelope element, a sensor and a sealing strip. BACKGROUND A folded section, obtained by stacking several plates, each formed by pressing a metal sheet material, and folding the ends of the plates, is provided, for example, around a peripheral edge of a motor vehicle door or around a peripheral edge of a door opening section. A hollow rebate element, having an approximately U-shaped cross-section and covering the folded section, is attached to it to prevent the folded area from being exposed. Examples of hollow rebate elements of this type include a sensor-equipped element with a foreign object detection sensor, mounted on a flange of a sliding door, an opening sealing element, a trunk sealing element, and a partition sealing element. The hollow rebate element, configured from one of these elements, is mounted on a flange. Japanese unexamined patent application No. S54-163950 discloses a fastening structure used to attach a hollow wrap element made of rubber or plastic to a flange. The hollow wrap element of Japanese unexamined patent application No. S 54-163950 has an approximately U-shaped cross-section with an upper section and a pair of lateral legs. A retaining tongue section is provided on the inner side of each of the lateral legs. The retaining tongue section consists of a web that is integral with the lateral legs and a thick-walled head section connected to the web. SUMMARY OF THE INVENTION TECHNICAL PROBLEM When attaching the hollow-folding element from the Japanese unexamined patent application No. S 54-163950 to the flange, the flange is inserted between the pair of retaining tongue sections, whereby the insertion of the flange is made possible by pivoting the head section about a side connected to the web as a pivot point. On the other hand, if an external force acts on the hollow rebate element with the flange inserted therein in a direction in which the hollow rebate element is separated from the flange, a base surface of the head section rests on a boundary surface that acts as a stop, so that the head section is prevented from pivoting in a decoupling direction of the flange, and a holding force of the hollow rebate element on the flange is increased by clamping the head section. Furthermore, when attaching the hollow wrap element from the Japanese unexamined patent application No. S 54-163950 to the flange, there is a need to minimize the force required for fastening in order to improve workability during the fastening process. Conversely, there is a need to increase the holding force of the hollow wrap element on the flange once it is fastened, so that the hollow wrap element cannot be easily detached from the flange. Thus, the hollow wrap element being fastened to the flange must meet these conflicting requirements to a high degree. In this respect, the hollow-folding element of the Japanese unexamined patent application No. S 54-163950 is configured such that the head section pivots with the aid of the web during flange insertion. However, the web must be made thinner to reduce the force required for insertion. If the web is thinned, however, there is a possibility that if an external force acts on the flange in the direction in which the hollow-folding element is separated from the flange, control of the head section's position will be insufficient, and the holding force of the hollow-folding element will therefore be reduced. With regard to the foregoing, the present disclosure was developed and thus one objective of the present disclosure is to ensure that the holding force of the hollow wrapping element is sufficiently ensured after its fastening, while at the same time reducing the force required for fastening the hollow wrapping element in order to improve processability during fastening. SOLUTION TO THE PROBLEM To achieve the objective described above, a first aspect of the present disclosure can be based on a fastening structure for a hollow wrap element, which is used to fasten the hollow wrap element to a flange of a motor vehicle. The hollow wrap element comprises a first side wall section arranged on one side in the thickness direction of the flange, a second side wall section arranged on the other side in the thickness direction of the flange, a connecting wall section extending in the thickness direction of the flange and connecting the first and second side wall sections, and a first retaining lip and a second retaining lip provided on an inner surface of the first side wall section.The first retaining lip is configured such that a basic section of it is connected to the inside of the first side wall section via a thin wall section and is in an inclined orientation in which the first retaining lip approaches the second side wall section when it is pushed towards a deep side in an insertion direction of the flange.The second retaining lip is positioned further on a near side in the insertion direction of the flange than the first retaining lip, configured to have a curved shape that is spaced from the base section of the first retaining lip towards the near side in the insertion direction of the flange when the flange is not inserted, and, on the other hand, to be deformed from the curved shape into an elongated shape due to a compressive force through the flange during insertion of the flange, and configured such that a tip end section of it engages between the base section of the first retaining lip and the inner surface of the first side wall section when the insertion of the flange is completed. According to the configuration described above, when the hollow wrap element is attached to the flange, it is inserted between the first and second side wall sections of the hollow wrap element. When the flange contacts the second retaining lip, the second retaining lip is deformed in its curved shape, thus elongating it and reducing the insertion force of the flange. Furthermore, the flange inserted between the first and second side wall sections also contacts the first retaining lip. However, because the first retaining lip is configured such that its base is connected to the inner surface of the first side wall section via the thin wall section, the first retaining lip can be easily displaced with minimal force, further reducing the insertion force. Once the flange is fully inserted, the second retaining lip deforms into an elongated shape, so that its tip engages between the base of the first retaining lip and the inner surface of the first sidewall section. This prevents the first retaining lip from rotating in the opposite direction to the flange's insertion direction. When an external force is applied to the hollow rebate element with the inserted flange in a direction that separates it from the flange, the first retaining lip is tensioned between the flange and the first sidewall section. This tension increases the holding force of the hollow rebate element. In a second aspect of the present disclosure, a recessed section can be formed between the base section of the first retaining lip and the inner surface of the first side wall section, which is open towards the near side in the insertion direction of the flange. In this case, the tip end section of the second retaining lip can be caused to engage in the recessed section when the insertion of the flange is complete. In this way, the tip end section of the first retaining lip can be reliably brought into engagement between the base section of the first retaining lip and the inner surface of the first side wall section. In a third aspect of the present disclosure, the second retaining lip can include an inclined plate section, inclined such that it can be positioned further on the deep side in the insertion direction of the flange when pushed from the inner surface of the first side wall section to the tip end side, and a tip end plate section extending from a tip end section of the inclined plate section to the deep side in the insertion direction of the flange. In this case, the inclined plate section and the tip end plate section together can form the curved shape. In a fourth aspect of the present disclosure, the flange can include a sealing material applied to one side in the thickness direction. In this case, the second retaining lip can be pressed against the flange by the sealing material during insertion. In a fifth aspect of the present disclosure, the sealing material can be applied to a section of the flange that is separated from the tip end section of the flange in the insertion direction towards a base end. In this case, the tip end section of the first retaining lip can be brought into contact with a section of the flange that is located further towards the tip end than the sealing material in the insertion direction when the insertion is complete. Thus, the tip end section of the first retaining lip can be reliably brought into contact with the flange and be under tension. In a sixth aspect of the present disclosure, a section between a base section and the tip end section of the second retaining lip can be configured such that it is separated from the inner surface of the first side wall section when the insertion of the flange is complete. That is, since the sealing material is amorphous when applied to a plate, it is less likely that the thickness of the sealing material will be set to a constant thickness in a state where the sealing material is applied to the flange. According to the sixth aspect, even if the thickness of the sealing material changes to some extent, the change in the thickness of the sealing material can be accommodated by deformation of the second retaining lip, so that the force required to fasten the hollow-wrap element to the flange can be reduced. ADVANTAGES OF THE INVENTION As described above, a holding force of the hollow wrap element can be sufficiently ensured after its fastening, while the force required to fasten a hollow wrap element to a flange can be reduced to improve workability during fastening. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a left-side view of a motor vehicle to which a mounting structure of a hollow-folding element according to an embodiment of the present disclosure is attached. Fig. 2 is a perspective view illustrating a front section of a left sliding door with the hollow-folding elements attached to it. Fig. 3 is a cross-sectional view corresponding to line III-III in Fig. 2 and illustrating a state of a flange in which the hollow-folding element is omitted. Fig. 4 is a cross-sectional view corresponding to line III-III in Fig. 2 and illustrating a state before insertion into the flange (functional components, such as a sealing function, a sensor function, or the like, are omitted). Fig. 5 is a cross-sectional view corresponding to line III-III in Fig. 2 and illustrating a stage in which the insertion of the hollow-folding element of Fig. 4 into the flange has just begun.Figure 6 is a cross-sectional view corresponding to line III-III in Figure 2 and illustrates a stage in which the hollow envelope element of Figure 4 has been partially inserted into the flange. Figure 7 is a cross-sectional view corresponding to line III-III of Figure 2 and shows a... The state illustrated is one in which the hollow envelope element of Fig. 4 is completely inserted into the flange. DETAILED DESCRIPTION An embodiment of the present disclosure is described below with reference to the accompanying drawings. It should be noted that the following preferred embodiment is purely exemplary and is intended to limit the scope of applications or uses of the present disclosure. Fig. 1 is a left-side view of a motor vehicle 100 to which a mounting structure of a hollow-cover element according to an embodiment of the present disclosure is attached. A front door 101, formed from a gull-wing door, is provided on the front side of the motor vehicle 100 on both the left and right sides. A sliding door 102 is provided on the rear side of the front door 101 on both the left and right sides of the motor vehicle 100. Fig. 2 is a perspective view illustrating a front section of the sliding door 102 on the left side. In each drawing, the front side of a vehicle is simply referred to as the "front," and the rear side of the vehicle is simply referred to as the "rear." A vehicle interior side and a vehicle exterior side are defined as illustrated in Fig. 2.A vehicle inside-outside direction is the same as a left-right direction (vehicle width direction) of motor vehicle 100. A door handle 103, used to operate the sliding door 102, is provided on the front section of the sliding door 102. A flange 104 extending in an upward-downward direction is provided on a front end section of the sliding door 102. The flange 104 of the sliding door 102 is an example of a flange of the motor vehicle 100. A hollow rebate element 1 is attached to the flange 104 of the sliding door 102. Fig. 3 is a cross-sectional view of the flange 104, corresponding to line III-III in Fig. 2, illustrating a state in which the hollow rebate element 1 is omitted. As illustrated in Fig. 3, the sliding door 102 comprises an outer plate 105, forming a vehicle exterior side of the sliding door 102, and an inner plate 106, forming a vehicle interior side of the sliding door 102. The outer plate 105 and the inner plate 106 are each formed by pressing a sheet of metal. A folded section 105a is provided on a front section of the outer panel 105. This means that a front section of the inner panel 106 rests against a surface of the outer panel 105 on the vehicle interior side. The folded section 105a of the outer panel 105 is folded backwards and engages in the thickness direction with the front section of the inner panel 106. Thanks to the provided folded section 105a, the outer panel 105 and the outer panel 106 can be joined together for integration. The thickness direction of the flange 104 coincides with the vehicle interior-exterior direction. In this embodiment, one side in the thickness direction of the flange 104 is defined as the vehicle interior side and the other side in the thickness direction of the flange 104 is defined as the vehicle exterior side. The flange 104 incorporates a sealing material 107 applied to the vehicle interior side. The sealing material 107 is applied to a section separated from a pointed end section (front end section) of the flange 104 in an insertion direction in which the flange 104 is inserted into the hollow rebate element 1 towards a base end thereto (towards the rear). In particular, one application position of the sealing material 107 is a position where the sealing material 107 covers one end of the folded section 105a of the outer plate 105, and the application of the sealing material 107 at this position provides a corrosion protection effect. The sealing material 107 is amorphous. For example, the sealing material 107 hardens over time when the pasty sealing material 107 is applied to the section of the flange section 104 on the vehicle interior side. Fig. 3 illustrates the sealing material 107 in a hardened state. Because an amorphous material is applied, the shape and thickness of the hardened sealing material 107 may vary from section to section in some cases. A fastening structure for the hollow door element 1 according to this embodiment is a structure used to fasten the hollow door element 1 to the flange 104 of the sliding door 102. In this case, an anti-pinch sensor (not illustrated) may be provided on the hollow door element 1, although this is not essential for the present invention. The anti-pinch sensor is a sensor that detects a foreign body present between the front end section of the sliding door 102 and a vehicle body and is configured to initiate an immediate change when the anti-pinch sensor comes into contact with a foreign body. The anti-pinch sensor can be formed separately from the hollow door element 1 and installed as an integrated component, or it can be formed integrally with the hollow door element 1, for example, during extrusion forming.In this case, the anti-pinch sensor can be a sensor to which the fastening structure of the hollow envelope element 1 is applied. Although not necessary for the present invention, the function of a sealing strip can be added to the hollow-cover element 1. In this case, a sealing strip can be used to which the fastening structure of the hollow-cover element 1 is applied. The sealing strip function can be added to the hollow-cover element 1, wherein a sealing section (not illustrated) is, for example, a section with a hollow cross-section or a section with a tongue-shaped cross-section that rests against the vehicle body or another door when the sliding door 102 is closed, in order to prevent the ingress of water, noise, wind, and the like into a vehicle interior provided on the hollow-cover element 1. This is achieved by configuring a composite hollow-cover element 1 that includes the sensor and the associated sealing strip function. Furthermore, the hollow sealing element 1 can be arranged not only linearly, but also as an opening seal designed to be positioned along an opening formed in the motor vehicle 100 with a flange curved along an auxiliary line, as a hood seal, as a trunk seal positioned on a peripheral edge region of a trunk lid or trunk opening, and as a boundary seal positioned on a boundary section. As described above, the arrangement position and shape of the hollow sealing element 1 are not particularly restricted, and the fastening structure of the hollow sealing element 1 according to the present disclosure can be used for fastening the hollow sealing element 1 to various types of flanges of the vehicle 100. Fig. 4 is a cross-sectional view of the hollow wrapping element 1, corresponding to line III-III in Fig. 2, illustrating a state before insertion into the flange 104. Figs. 5, 6 to 7 are cross-sectional views corresponding to line III-III in Fig. 2. Fig. 5 illustrates a state in which the insertion of the flange 104 into the hollow wrapping element 1 has just begun, Fig. 6 illustrates a state in which the flange 104 is partially inserted into the hollow wrapping element 1, and Fig. 7 further illustrates a state in which the flange 104 is completely inserted into the hollow wrapping element 1. The hollow envelope element 1 comprises a side wall section of the vehicle interior (first side wall section) 10, a side wall section of the vehicle exterior (second side wall section) 20, a connecting wall section 30, and a core material 40. The side wall section of the vehicle interior 10 is a wall section located on the side of the vehicle interior that is one side in the thickness direction of the flange 104 and extends along the flange 104 in an upward-downward and front-rear direction. The side wall section of the vehicle exterior 20 is a wall section located on the side of the vehicle exterior that is the other side in the thickness direction of the flange 104 and extends along the flange 104 in an upward-downward and front-rear direction. The connecting wall section 30 is a wall section that extends in the thickness direction of the flange 104 and also in the upward-downward direction, connecting the side wall section of the vehicle interior 10 and the side wall section of the vehicle exterior 20. A portion of the connecting wall section 30 located on the vehicle interior side is integrated with a front end section of the side wall section of the vehicle interior 10, which is a base end section thereof, while a portion of the connecting wall section 30 located on the vehicle exterior side is integrated with a front end section of the side wall section of the vehicle exterior 20, which is a base end section thereof. Therefore, the connecting wall section 30 extends from the front end section of the side wall section of the vehicle interior 10 to the front end section of the side wall section of the vehicle exterior 20. One dimension of the side wall section of the vehicle interior 10 in the front-to-rear direction is longer than one dimension of the side wall section of the vehicle exterior 20 in the front-to-rear direction. Consequently, a rear end section of the side wall section of the vehicle interior 10 is positioned further towards the rear than a rear end section of the side wall section of the vehicle exterior 20. The core material 40 is embedded in the side wall section of the vehicle interior 10, the side wall section of the vehicle exterior 20, and the connecting wall section 30. Sections of the hollow wrap element 1, apart from the core material 40, are made of an elastic material, such as ethylene propylene diene monomer (EPDM) rubber, thermoplastic elastomer, or the like. The material of the core element 40 can be any material that is harder and less deformable than the elastic material formed by the sections of the hollow wrap element 1, with the exception of the core element 40. Examples of the material of the core material 40 include, for example, a hard resin material, a metal material, or the like. The core element 40 can be provided as required and is not an essential component of the present invention. The core element 40 comprises a side panel section of the vehicle interior 41, which is embedded in the side wall section of the vehicle interior 10, a side panel section of the vehicle exterior 42, which is embedded in the side wall section of the vehicle exterior 20, and a connecting panel section 43, which is embedded in the connecting wall section 30. The side panel section 41 of the vehicle interior, the side panel section of the vehicle exterior 42, and the connecting panel section 43 are formed in one piece. One dimension of the side wall section of the vehicle interior 41 in the front-to-rear direction is longer than one dimension of the side wall section of the vehicle exterior 42 in the front-to-rear direction to accommodate a dimensional difference between the side wall section of the vehicle interior 10 and the side wall section of the vehicle exterior 20 in the front-to-rear direction.Since the core material 40 is embedded, deformation of the hollow envelope element 1 in an opening direction, i.e. a deformation in which a rear end section of the side wall section of the vehicle interior 10 and a rear end section of the side wall section of the vehicle exterior 20 are separated from each other, is inhibited. A first retaining lip 51 and a second retaining lip 52 are provided on an inner surface of the side wall section of the vehicle interior 10. A base section 51a of the first retaining lip 51 is connected to the inner surface of the side wall section of the vehicle interior 10 via a thin wall section 53, and the first retaining lip 51 is formed integrally with the side wall section of the vehicle interior 10. The thickness of the first retaining lip 51 is less than the thickness of the side wall section of the vehicle interior 10. A recessed section 55, open to the rear, is formed between the base section 51a of the first retaining lip 51 and the inner surface of the side wall section of the vehicle interior 10. The first retaining lip 51 is in an inclined orientation, in which it approaches the second side wall section of the vehicle exterior 20 when it is pushed towards a deeper side in the insertion direction of the flange 104 (forward in this embodiment). As illustrated in Fig. 4, in a state prior to the insertion of the flange 104, a pointed end section 51b of the first retaining lip 51 is separated from the inner surface of the side wall section of the vehicle outer area 20 by a distance A. The distance A is shorter than a thickness dimension B of a section of the flange 104 that is positioned further on the front face than the sealing material 107, as illustrated in Fig. 3. The second retaining lip 52 is positioned further on a near side in the insertion direction of the flange 104 (the rear side in this embodiment) than the first retaining lip 51 and is formed integrally with the side wall section of the vehicle interior 10. The thickness of the second retaining lip 52 is less than the thickness of the side wall section of the vehicle interior 10. A base section 52a of the second retaining lip 52 is separated from the base section 51a of the first retaining lip 51 to the rear and is positioned near the rear end section of the side wall section of the vehicle exterior 20. As illustrated in Fig. 4, the second retaining lip 52 is configured to have a curved shape that is separated from the base section 51a of the first retaining lip 51 to the rear when the flange 104 is not inserted. In particular, the second retaining lip 52 includes an inclined plate section 52b, inclined so that it can be positioned further on the front and exterior of the vehicle when pushed from the inner surface of the side wall section of the vehicle interior 10 toward a pointed end of the second retaining lip 52, and a pointed end plate section 52c extending forward from the pointed end section of the inclined plate section 52b. The inclined plate section 52b and the pointed end plate section 52c together form the curved shape of the flange 104 when the flange 104 is not inserted. When the flange 104 is not inserted, a boundary section between the inclined plate section 52b and the pointed end plate section 52c in the second retaining lip 52 is located closest to the inner surface of the side wall section of the vehicle exterior 20. The pointed end plate section 52c is designed such that it is further separated from the inner surface of the side wall section of the vehicle exterior 20 when pushed forward by the boundary section described above. That is, when the flange 104 is not inserted, a pointed end section 52d of the pointed end plate section 52c is positioned so that it faces the inner surface of the side wall section of the vehicle interior 10. When the flange 104 is not inserted, the pointed end section 52d of the pointed end plate section 52c is also positioned further towards the rear than the base section 51a of the first retaining lip 51. A state illustrated in Fig. 5 is one immediately after the flange 104 makes contact with the second retaining lip 52, and therefore the second retaining lip 52 has essentially the same shape as the one illustrated in Fig. 4. As illustrated in Figs. 6 and 7, on the other hand, when the flange 104 is inserted between the side wall section of the vehicle interior 10 and the side wall section of the vehicle exterior 20, the second retaining lip 52 contacts the second retaining lip 52 from the vehicle exterior side and presses the second retaining lip 52 towards the vehicle interior side. Since the sealing material 107 is provided on a section of the flange 104 on the vehicle interior side, the second retaining lip 52 is pressed against the flange 104 by the sealing material 107 and not by a plate metal section of the flange 104 during insertion. When the flange 104 experiences a compressive force towards the vehicle interior side during its insertion, the second retaining lip 52 is deformed from the curved shape illustrated in Figs. 4 and 5 into an elongated shape illustrated in Figs. 6 and 7 due to this compressive force. As illustrated in Fig. 7, the pointed end section 52d of the second retaining lip 52 engages in the recessed section 55 between the base section 51a of the first retaining lip 51 and the inner surface of the side wall section of the vehicle interior 10 when the insertion of the flange 104 is complete. When the insertion of the flange 104 is complete, a section between the base section 52a and the tip section 52d of the second retaining lip 52 is formed such that it is separated from the inner surface of the side wall section of the vehicle interior 10. In particular, the boundary section between the inclined plate section 52b and the tip plate section 52c in the second retaining lip 52 has a shape that is curved in a direction in which the boundary section is separated from the inner surface of the side wall section of the vehicle interior 10. When the insertion of the flange 104 is complete, the pointed end section 51b of the first retaining lip 51 also rests against a section (plate metal section) of the flange 104 that is located further forward than the sealing material 107. In a state where the pointed end section 51b of the first retaining lip 51 rests against the flange 104, the first retaining lip 51 is inclined such that, as it extends forward, it is closer to the side wall section of the vehicle exterior 20. In general, the metal plate section of the flange 104 is a section that has a higher dimensional accuracy than the sealing material 107, and the pointed end section 51b of the first retaining lip 51 can rest against the section with the higher dimensional accuracy. (Attachment of the hollow rebate element to the flange) When attaching the hollow-folding element 1, configured as described above, to the flange 104, the hollow-folding element 1 is first positioned, as illustrated in Fig. 5, such that the pointed end section of the flange 104 is located between the side wall section of the vehicle interior 10 and the side wall section of the vehicle exterior 20 of the hollow-folding element 1. Then, as illustrated in Fig. 6, the hollow-folding element 1 is moved rearward and the flange 104 is inserted between the side wall section of the vehicle interior 10 and the side wall section of the vehicle exterior 20 of the hollow-folding element 1. While a surface of the flange 104 on the vehicle exterior side is sliding into contact with the inner surface of the outer wall section 20 of the hollow-folding element 1, the second retaining lip 52 is pressed against the vehicle interior side by the sealing material 107.The second retaining lip 52, pressed against the vehicle interior side, is deformed in a direction that increases the angle between the inclined plate section 52b and the pointed end plate section 52c, thus giving it an elongated shape. Therefore, the second retaining lip 52 does not significantly impede the sealing material 107, thereby reducing the insertion force. Furthermore, when the second retaining lip 52 has an elongated shape, the pointed end section 52d of the second retaining lip 52 engages in the recessed section 55. As illustrated in Fig. 7, the pointed end section 51b of the first retaining lip 51 rests against the flange 104 when the flange 104 is fully inserted between the side wall section of the vehicle interior 10 and the side wall section of the vehicle exterior 20 of the hollow wrap element 1. When the pointed end section 51b of the first retaining lip 51 rests against the flange 104, the base section 51a of the first retaining lip 51 is connected to the inner surface of the side wall section of the vehicle interior 10 via the thin wall section 53. Therefore, the first retaining lip 51 can be easily displaced with a small force, thus reducing the insertion force of the flange 104. When the flange 104 is fully inserted, the hollow rebate element 1 is attached to the flange 104. In the state described above, the pointed end section 52d of the second retaining lip 52 engages in the recessed section 55 between the base section 51a of the first retaining lip 51 and the inner surface of the side wall section of the vehicle interior 10. Therefore, the first retaining lip 51 does not rotate in a direction opposite to the insertion direction of the flange 104. That is, the pointed end section 52d of the second retaining lip 52 acts as a stop, restricting rotation of the first retaining lip 51.In a case where an external force acts on the hollow wrapping element 1 with the flange 104 inserted therein in a direction in which the hollow wrapping element 1 is separated from the flange 104, the movement of the base section 51a of the first retaining lip 51 is restricted when the tip end section 51b of the first retaining lip 51 rotates rearward after the movement of the flange 104, and consequently the first retaining lip 51 is tensioned between the flange 104 and the side wall section of the vehicle interior 10. When the first retaining lip 51 is tensioned between the flange 104 and the side wall section of the vehicle interior 10, a restraining force of the hollow wrapping element 1 is increased, and therefore separation of the hollow wrapping element 1 from the flange 104 is inhibited. In the case of a hollow cover element with a sensor, it is particularly necessary to securely fasten the hollow cover element to the flange 104 so that it does not shift after being fastened. By applying the present disclosure to the hollow cover element with a sensor, the position of the hollow cover element 1 fastened to the flange 104 can be maintained in the intended position, and a deterioration of the sensor's detection range can be prevented. When the present disclosure is applied to a hollow-folding element with a sealing section that rests against the vehicle body or another door to prevent the ingress of water, noise, wind or the like into the vehicle interior, a position of the sealing section attached to the flange 104 can be maintained, thereby maintaining a high sealing performance. The embodiment described above is in every respect merely illustrative and should not be interpreted restrictively. Furthermore, all modifications and changes within an equivalent scope of protection of the claims fall within the scope of protection of the present invention. It should be noted that the embodiment described above describes a case in which the hollow-folding element 1 is attached to a structure in which the sealing material 107 is provided on the flange 104; however, the flange 104 can also be provided without the sealing material 107. The flange 104 need not be made of metal. Although not illustrated, in some cases, for example, no folded section is provided when the flange is made of resin, and the present disclosure is also applicable even when the hollow-folding element 1 is attached to the flange of the structure described above. INDUSTRIAL APPLICABILITY As described above, a fastening structure of a hollow envelope element according to the present disclosure can be used, for example, to fasten a sensor, a door opening seal, a hood seal, a trunk seal, a partition seal and the like to a flange of a door or a vehicle body. DESCRIPTION OF REFERENCE MARKS 1 Hollow wrap element 10 Side wall section of the vehicle interior (first side wall section) 20 Side wall section of the vehicle exterior (second side wall section) 30 Connecting wall section 51 First retaining lip 51a Base section 52 Second retaining lip 53 Thin wall section 55 Recessed section 104 Flange 107 Sealing material QUOTES INCLUDED IN THE DESCRIPTION This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature JP 2025-026879

[0001] JP 54-163950 [0004, 0005, 0007, 0008]

Claims

Fastening structure of a hollow wrap element used for fastening the hollow wrap element to a flange of a motor vehicle, wherein the hollow wrap element comprises a first side wall section arranged on one side in a thickness direction of the flange, a second side wall section arranged on the other side in the thickness direction of the flange, a connecting wall section extending in the thickness direction of the flange and connecting the first side wall section and the second side wall section, and a first retaining lip and a second retaining lip provided on an inner surface of the first side wall section, the first retaining lip being configured such that a base section thereof is connected to the inside of the first side wall section via a thin wall section and is in an inclined orientation in which the first retaining lip approaches the second side wall section.when it is advanced in an insertion direction of the flange towards a deep side, and the second retaining lip is positioned further on a near side in the insertion direction of the flange than the first retaining lip, is configured to have a curved shape that is spaced from the base section of the first retaining lip towards the near side in the insertion direction of the flange when the flange is not inserted, and on the other hand, is deformed from the curved shape into an elongated shape during the insertion of the flange due to a compressive force through the flange, and is configured such that a tip end section of it engages between the base section of the first retaining lip and the inner surface of the first side wall section when the insertion of the flange is complete. Fastening structure of a hollow envelope element according to claim 1, wherein a recessed section, which is open to the near side in the insertion direction of the flange, is formed between the base section of the first retaining lip and the inner surface of the first side wall section, and when the insertion of the flange is completed, the tip end section of the second retaining lip engages in the recessed section. Fastening structure of a hollow envelope element according to claim 1, wherein the second retaining lip comprises an inclined plate section inclined such that it can be positioned further on the deep side in the insertion direction of the flange when pushed from the inner surface of the first side wall section to the tip end side, and a tip end plate section extending in the insertion direction of the flange from a tip end section of the inclined plate section to the deep side, and the inclined plate section and the tip end plate section together form the curved shape. Fastening structure of a hollow envelope element according to claim 1, wherein the flange contains a sealing material which is applied on one side in the thickness direction, and the second retaining lip is pressed against the sealing material during the insertion of the flange. Fastening structure of a hollow-folding element according to claim 4, wherein the sealing material is applied to a section of the flange which is separated from the tip end section of the flange in the insertion direction in the direction of a base end thereof, the tip end section of the first retaining lip bearing against a section of the flange which is located further on the tip end side in the insertion direction than the sealing material when the insertion is complete. Fastening structure of a hollow envelope element according to claim 4, wherein a section between a base section and the tip end section of the second retaining lip is designed such that it is separated from the inner surface of the first side wall section when the insertion of the flange is completed. Sensor to which the fastening structure of a hollow envelope element according to claim 1 is applied. Sealing strip to which the fastening structure of a hollow envelope element according to claim 1 is applied.

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