Vehicle door plate sealing device

Abstract

The utility model relates to the technical field of vehicle sealing structures, and discloses a vehicle door plate sealing device which comprises a rubber strip with a U-shaped cross section, the U-shaped cross section of the rubber strip is composed of an outer wall, an inner wall and a bottom wall connected between the outer wall and the inner wall, and an outer side elastic clamping rib is arranged on the side, facing the inner wall, of the outer wall. An inner side elastic clamping rib is arranged on the side, facing the outer wall, of the inner wall, a clamping gap is formed between the outer side elastic clamping rib and the inner side elastic clamping rib, and elastic deformation spaces are formed between the outer side elastic clamping rib and the bottom wall and between the inner side elastic clamping rib and the bottom wall. The utility model solves the problem in the prior art that the sealing element is poor in air tightness during installation, connection and subsequent use when the sealing element is arranged between connecting pieces which have a relative connection matching relationship, such as a door plate lower body and a vehicle body metal plate, in a vehicle.

Description

TECHNICAL FIELD

[0001] The utility model relates to vehicle sealing structure technical field, concretely relates to a door panel sealing device. BACKGROUND

[0002] The cooperation requirement between the inner part connecting pieces of the vehicle is higher, for example, the door plate lower body and the vehicle body sheet metal have higher air sealing requirements, so that the door plate lower body and the vehicle body sheet metal form close adhesion when the door is closed, thereby avoiding that the dust and sewage outside the vehicle enter the vehicle during the use of the vehicle.

[0003] Although the PU foam strip bonding mode in the prior art can achieve good sealing effect, there are still the following problems in actual application: 1. Because of the manufacturing error, the door plate lower body and the vehicle body sheet metal may have certain error deformation during the forming process, when the PU foam strip is bonded to the door plate lower body, the PU foam strip will be bent following the error deformation of the door plate lower body, and the PU foam strip cannot be completely adhered to the vehicle body sheet metal, resulting in air tightness unqualified; 2. When the PU foam strip is bonded to the door plate lower body, with the door closing for many times, the automatic rebound performance of the PU foam strip is weakened after long-term repeated extrusion, resulting in that the adhesion and sealing between the PU foam strip and the vehicle body sheet metal are insufficient after a period of use, affecting the use of the vehicle; at the same time, part or all of the bonding surface between the PU foam strip and the door plate lower body is detached after long-term use, so that the sealing performance is partially or completely lost. Therefore, it is necessary to improve the sealing structure of the connecting pieces such as the door plate lower body and the vehicle body sheet metal which have relative connection and cooperation relationship, so as to ensure that the connecting pieces keep good sealing effect for a long time. CONTENT OF THE UTILITY MODEL

[0004] The utility model intends to provide a door plate sealing device, to solve the problem of poor air tightness of the sealing piece during installation and connection and subsequent use when the sealing piece is arranged between the connecting pieces such as the door plate lower body and the vehicle body sheet metal which have relative connection and cooperation relationship in the prior art.

[0005] To solve the above problems, the utility model discloses the following technical scheme: a kind of door panel sealing device, including the rubber strip of U-shaped cross section, the U-shaped section of rubber strip is composed of outer wall, inner wall and bottom wall connected between outer wall and inner wall, the side of outer wall towards inner wall is equipped with outside elastic rib, the side of inner wall towards outer wall is equipped with inside elastic rib, and outside elastic rib and inside elastic rib are equipped with clamping gap between, and outside elastic rib and inside elastic rib are all equipped with elastic deformation space between bottom wall.

[0006] The principle and beneficial effects of the present application are as follows: the cross section of the rubber strip is U-shaped. During use, the end of the connecting piece (e.g., the end of the door panel lower body) in the prior art is clamped with the rubber strip. The outer wall of the rubber strip is in contact with the A surface of the connecting piece, and the inner wall is in contact with the B surface of the connecting piece. In the present application, the outside elastic rib is arranged on the inner side of the outer wall, and the inside elastic rib is arranged on the inner side of the inner wall. The clamping gap between the outside elastic rib and the inside elastic rib is smaller than the thickness of the connecting piece. When the end of the connecting piece is inserted into the U-shaped cross section of the rubber strip, the elastic deformation space between the outside elastic rib and the inside elastic rib and the bottom wall provides a deformation space for the elastic deformation of the outside elastic rib and the inside elastic rib. The A surface of the connecting piece is in contact with and tightly abuts against the outside elastic rib, and the B surface of the connecting piece is in contact with and tightly abuts against the inside elastic rib. This forms a tight clamping and fixing between the connecting piece and the rubber strip, and prevents the rubber strip from falling off during use.

[0007] In addition, in the present application, the elastic deformation space is arranged between the outside elastic rib and the inside elastic rib and the bottom wall. The elastic deformation space not only provides an elastic deformation space for the clamping of the outside elastic rib and the inside elastic rib with the connecting piece, but also forms a buffer space between the end of the connecting piece and the bottom wall after the connecting piece is inserted into the U-shaped cross section. When the connecting piece is connected with other connecting pieces, the bottom wall can be elastically extruded into the elastic deformation space. The rubber strip, which already has good elastic extrusion performance, has a larger elastic deformation amount. The bottom wall can better adhere to other connecting pieces to achieve a more stable sealing effect, and the air tightness of the entire connecting structure is more stable.

[0008] Preferably, as an improvement, the end of the outside elastic rib away from the outer wall and the end of the inside elastic rib away from the inner wall are both inclined to the bottom wall.

[0009] In the scheme, the outer elastic clamping rib and the inner elastic clamping rib are both inclined to the bottom wall. When the connecting piece is inserted into the U-shaped cross section of the rubber strip, the inclined outer elastic clamping rib and the inclined inner elastic clamping rib can guide the insertion process of the connecting piece, so that the installation of the rubber strip is more convenient. At the same time, after the rubber strip is installed in place, the outer elastic clamping rib and the inner elastic clamping rib are both elastically deformed under pressure, so that the inclination angle of the outer elastic clamping rib and the inner elastic clamping rib increases. At this time, if you want to pull the rubber strip off the connecting piece, the outer elastic clamping rib and the inner elastic clamping rib will be squeezed to provide greater elastic clamping force to the connecting piece, thereby providing more stable clamping and fixing effect to the connecting piece.

[0010] Preferably, as an improvement, the number of outer elastic clamping ribs is at least two, and the number of inner elastic clamping ribs is greater than the number of outer elastic clamping ribs. The adjacent outer elastic clamping ribs and the adjacent inner elastic clamping ribs are both spaced apart.

[0011] In the scheme, the number of outer elastic clamping ribs and the number of inner elastic clamping ribs are both multiple, which improves the stability of the connecting piece after being clamped and fixed after being inserted into the U-shaped cross section. At the same time, the adjacent outer elastic clamping ribs and the adjacent inner elastic clamping ribs are both spaced apart, so that there is a gap between the adjacent outer elastic clamping ribs and the adjacent inner elastic clamping ribs. When the rubber strip is installed on the connecting piece, all the outer elastic clamping ribs and the inner elastic clamping ribs can be elastically deformed.

[0012] In addition, in the scheme, the number of inner elastic clamping ribs is greater than the number of outer elastic clamping ribs. During the installation of the rubber strip, due to the larger number of inner elastic clamping ribs, the clamping and fixing effect between the inner wall and the connecting piece is stronger. The number of outer elastic clamping ribs is smaller, although the clamping and fixing effect on the connecting piece is relatively weak, but after installation, the outer wall has smaller clamping and fixing force on the connecting piece, and the deformation caused by stress is less, so that the appearance of the outer wall is more flat and beautiful. Therefore, by using the scheme, the stability of the clamping and fixing of the connecting piece is ensured, and the beauty of the appearance of the outer wall on the side of the connecting piece A after the rubber strip is connected is also effectively ensured.

[0013] Preferably, as an improvement, the outer elastic clamping rib and the inner elastic clamping rib are staggered along the arrangement direction of the outer elastic clamping rib.

[0014] In the scheme, the outer elastic clamping rib and the inner elastic clamping rib are staggered along the arrangement direction of the outer elastic clamping rib. This not only facilitates the injection molding of the outer elastic clamping rib and the inner elastic clamping rib, but also improves the clamping and fixing effect on the connecting piece, so that the rubber strip can be more stably connected with the connecting piece after installation, and a more stable sealing effect is achieved during use.

[0015] Preferably, as an improvement, the inner elastic rib close to the bottom wall is a matching rib, and the side of the matching rib away from the bottom wall is provided with an inclined abutting surface matched with the end surface of the connecting piece.

[0016] In this scheme, the inclined abutting surface is arranged on the side of the matching rib away from the bottom wall, and after the rubber strip is clamped and fixed with the connecting piece, the inclined abutting surface is abutted with the inclined end surface of the end of the connecting piece, so that the clamping installation of the rubber strip is more accurate, and the matching rib and the bottom wall are provided with the elastic deformation space as described above, and after the rubber strip is installed in place, the bottom wall can be deformed under the gap of the elastic deformation space in the direction of the matching rib, so that the rubber strip can better abut and seal when cooperating with other connecting pieces, and better sealing effect is achieved.

[0017] Preferably, as an improvement, the thickness of the inner wall is greater than the thickness of the outer wall, and the inner wall is provided with a buffer cavity arranged along the length direction of the rubber strip.

[0018] In this scheme, the thickness of the inner wall is set to be larger, so as to meet the use demand that the structure strength requirement is higher after a larger number of inner elastic ribs are arranged on the inner wall, and to ensure that the inner wall has sufficient strength and forms a more stable connection with the connecting piece. At the same time, in this scheme, the buffer cavity is arranged in the inner wall, and during the installation and clamping of the rubber strip, the buffer cavity can play a certain buffering effect on the larger number of inner elastic ribs, so that the installation and fixation of the rubber strip are more smooth.

[0019] Preferably, as an improvement, the number of the buffer cavities is multiple, and the multiple buffer cavities are arranged at intervals along the arrangement direction of the inner elastic rib, and a partition rib is arranged between adjacent buffer cavities.

[0020] In this scheme, multiple buffer cavities are arranged, and a partition rib is arranged between adjacent buffer cavities, so as to ensure that the buffer cavities can effectively buffer the inner wall and the inner elastic rib, and also ensure that the entire inner wall has good strength and can be stably and abuttedly connected with the B surface of the connecting piece.

[0021] Preferably, as an improvement, the bottom wall is provided with a recessed groove recessed inwardly close to the middle position of the outer side of the bottom wall.

[0022] In the scheme, the recessed groove recessed inwardly to the bottom wall is arranged near the middle position on the outer side of the bottom wall, and after the rubber strip is installed on the connecting piece, the outer side of the bottom wall of the rubber strip cooperates with other connecting pieces (for example, the vehicle body sheet metal) to play a sealing effect. Due to the recessed groove, on the one hand, after the recessed groove is arranged, the outer side of the bottom wall can avoid being in a plane state, and when the outer side of the bottom wall contacts other connecting pieces, compared with the plane state of the bottom wall, the connection between the bottom wall and other connecting pieces is two line contacts (or a small contact surface with the line as a baseline) along the length direction of the rubber strip, so that the fitting of the bottom wall and other connecting pieces is more stable, and even if the fitting surface of other connecting pieces has a small error deformation, a good fitting and sealing can be formed; on the other hand, the recessed groove can provide a deformation space for the two ends of the outer side of the bottom wall, so that the two ends of the bottom wall can better fit other connecting pieces to play a sealing role.

[0023] Preferably, as an improvement, the outer side of the bottom wall is provided with a reinforcing protrusion protruding outwardly to the rubber strip near the two ends.

[0024] In the scheme, the reinforcing protrusion is arranged at the two ends of the outer side of the bottom wall, so that the structural strength of the bottom wall is better, and after a long time of relative movement of the bottom wall and other parts, the bottom wall can still maintain a good sealing effect when cooperating, and after the reinforcing protrusion is arranged, the relative movement between the bottom wall and other connecting pieces is mainly the relative contact between the reinforcing protrusion and other connecting pieces, which can effectively reduce the friction of the bottom wall and prolong the service life of the whole sealing device.

[0025] Preferably, as an improvement, the rubber strip is fixedly connected with a U-shaped metal spring piece matched with the U-shaped cross section of the rubber strip.

[0026] In the scheme, the U-shaped metal spring piece is fixedly arranged in the rubber strip, and the cross section of the U-shaped metal spring piece is matched with the U-shaped cross section of the rubber strip, so that the U-shaped metal spring piece can simultaneously play an auxiliary supporting effect on the outer wall, the bottom wall and the inner wall, enhance the clamping stability after the rubber strip is connected with the connecting piece, and make the sealing effect more stable. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a front view of the embodiment one of the utility model.

[0028] Figure 2 It is a sectional view (the outer side elastic clamping rib and the inner side elastic clamping rib are not shown and are extruded to an elastic deformation state) that a door plate sealing device in the embodiment one of the utility model is connected with a door plate lower body and a vehicle body sheet metal.

[0029] Figure 3 It is a front view of the embodiment two of the utility model.

[0030] Figure 4 It is a front view of the embodiment three of the utility model.

[0031] Figure 5 This is a schematic diagram of the connection between a door panel sealing device and the body sheet metal in Embodiment 3 of this utility model. Detailed Implementation

[0032] The following detailed description illustrates the specific implementation method:

[0033] The reference numerals in the accompanying drawings include: outer wall 1, inner wall 2, buffer cavity 201, partition rib 202, bottom wall 3, recessed groove 301, outer elastic retaining rib 4, inner elastic retaining rib 5, mating retaining rib 501, inclined mating surface 5011, snap-fit ​​gap 6, elastic deformation space 7, U-shaped metal spring 8, reinforcing protrusion 9, lower body of door panel 100, and body sheet metal 200.

[0034] Example 1

[0035] This embodiment is as shown in the attached figure. Figure 1 As shown: A door panel sealing device includes a rubber strip with a U-shaped cross-section. The U-shaped cross-section of the rubber strip consists of an outer wall 1, an inner wall 2, and a bottom wall 3 integrally formed between the outer wall 1 and the inner wall 2. The outer wall 1 and the inner wall 2 are arranged parallel to each other, and the bottom wall 3 is perpendicular to both the outer wall 1 and the inner wall 2. In use, the U-shaped cross-section of the rubber strip is inserted into the end of a connector in the prior art (e.g., the bottom end of the lower body 100 of the vehicle door panel), so that the rubber strip and the connector are locked together. Therefore, when the rubber strip is set, the length direction of the rubber strip is adapted to the extension curve of the corresponding connector end.

[0036] like Figure 1 As shown, to improve the stability of the rubber strip after it is snapped and fixed to the connector, in this embodiment, an outer elastic retaining rib 4 is integrally formed on the side of the outer wall 1 facing the inner wall 2, and an inner elastic retaining rib 5 is integrally formed on the side of the inner wall 2 facing the outer wall 1, and both the outer elastic retaining rib 4 and the inner retaining rib are inclined towards the bottom wall 3. A snapping gap 6 is provided between the outer elastic retaining rib 4 and the inner elastic retaining rib 5. The spacing value of the snapping gap 6 is less than the thickness value of the corresponding connector, so that after the rubber strip is connected to the end of the connector, both the outer elastic retaining rib 4 and the inner retaining rib can be squeezed and elastically deformed, so that the rubber strip is more stably snapped and fixed to the connector.

[0037] To further improve the stability after the rubber strip and the connector are snapped together, in this embodiment, there are at least two outer elastic retainers 4 and two inner elastic retainers 5, and the number of inner elastic retainers 5 is greater than the number of outer elastic retainers 4. Figure 1 The diagram shows two outer elastic retainers 4 and three inner elastic retainers 5. Both the outer elastic retainers 4 and the inner elastic retainers 5 are along...Figure 1 The outer elastic clamping rib 4 and the inner elastic clamping rib 5 are arranged in a vertical direction, and are arranged at intervals between adjacent outer elastic clamping ribs 4 and between adjacent inner elastic clamping ribs 5, and the outer elastic clamping rib 4 and the inner elastic clamping rib 5 are arranged in a vertical direction, so as to form a more stable clamping connection relationship with the connecting piece.

[0038] In addition, in the embodiment, the outer elastic clamping rib 4 and the inner elastic clamping rib 5 close to the bottom wall 3 are provided with an elastic deformation space 7 between the bottom wall 3, and the bottom wall 3 can be elastically deformed inward when the bottom wall 3 contacts other connecting pieces, so as to form a close fit between the bottom wall 3 and other connecting pieces to ensure sealing. At the same time, in order to better and more accurately clamp and fix the end of the rubber strip and the connecting piece, the inner elastic clamping rib 5 at the bottom in the embodiment is a matching clamping rib 501, and the top surface of the matching clamping rib 501 away from the bottom wall 3 is provided with an inclined fitting surface 5011 matched with the inclined end surface of the connecting piece. When the rubber strip is installed, the inclined fitting surface 5011 is matched with the end surface of the connecting piece, so that the bottom end of the connecting piece and the inner wall 2 of the bottom wall 3 form the aforementioned elastic deformation space 7.

[0039] As shown in Figure 1 , the thickness of the inner wall 2 is greater than the thickness of the outer wall 1, so that the inner wall 2 can provide support for a larger number of inner elastic clamping ribs 5, so that the inner elastic clamping rib 5 can stably clamp and fix the connecting piece. At the same time, in order to make the rubber strip more convenient and labor-saving when clamped and fixed, the inner wall 2 in the embodiment is integrally formed with a plurality of buffer cavities 201 along the length direction of the rubber strip. The buffer cavities 201 are hollow and sealed, and the number of buffer cavities 201 is multiple. The plurality of buffer cavities 201 are arranged along the arrangement direction of the plurality of inner elastic clamping ribs 5, and a partition rib 202 is integrally formed between adjacent buffer cavities 201. The partition rib 202 assists in supporting the inside of the inner wall 2, effectively ensuring the structural strength of the inner wall 2.

[0040] The specific implementation process is as follows:

[0041] In the use of the vehicle door sealing device, the rubber strip is connected to the door plate lower body 100, and the door plate lower body 100 is matched with the vehicle body sheet metal 200. As shown in Figure 2 , the U-shaped cross-section opening of the rubber strip is inserted upward into the bottom end of the door plate lower body 100, so that the bottom surface of the door plate lower body 100 is matched with the inclined matching surface of the top surface of the matching clamping rib 501. During the insertion of the door plate lower body 100, the inner elastic clamping rib 5 and the outer elastic clamping rib 4 arranged at an angle can guide the installation of the rubber strip, making the installation of the rubber strip more rapid and accurate.

[0042] When the rubber strip is installed in place, the outer elastic rib 4 is in contact with the A surface of the door plate lower body 100 and tightly abuts, and the inner elastic rib 5 is in contact with the B surface of the door plate lower body 100 and tightly abuts, so that the rubber strip can be stably clamped and fixed with the door plate lower body 100, effectively avoiding easy slipping of the rubber strip during use. At the same time, when the door plate lower body 100 is closed, the bottom wall 3 of the rubber strip is in contact with the vehicle body panel 200, and the rubber strip itself has good elastic deformation performance and can automatically adhere to the vehicle body panel 200 to form a good seal when being extruded by the vehicle body panel 200. In addition, due to the existence of the elastic deformation space 7, the bottom wall 3 can elastically deform into the elastic deformation space 7 when being tightly pressed by the vehicle body panel 200, thereby effectively ensuring that the rubber strip adheres to the vehicle body panel 200 to seal, and also protecting the bottom wall 3 of the rubber strip, effectively prolonging the service life of the rubber strip and providing stable sealing effect for a long time.

[0043] Example Two

[0044] The difference between Example Two and Example One is that, as shown in Figure 3 , a U-shaped metal spring 8 with a U-shaped cross-section of the rubber strip is fixedly connected in the rubber strip in this embodiment. The U-shaped metal spring 8 is located at the middle thickness position of the U-shaped cross-section of the rubber strip, and the U-shaped metal spring 8 is arranged in the buffer cavity 201. The U-shaped metal spring 8 is used to improve the structural strength of the entire rubber strip, so that the rubber strip is more stable when being clamped and fixed with the door plate lower body 100, and will not be easily deformed and damaged during use. The fixing method of the U-shaped metal spring 8 can be integrally formed when the rubber strip is injection molded. The U-shaped metal spring 8 can be an aluminum spring, a stainless steel spring, and other metal springs, which will not be described here.

[0045] Example Three

[0046] The difference between Example Three and Example Two is that, as shown in Figure 4 and Figure 5 , a reinforcing protrusion 9 protruding outward from the rubber strip is arranged on the outer side of the bottom wall 3 close to the left and right ends in this embodiment. The reinforcing protrusion 9 is used to strengthen the structure of the connection position of the outer wall 1 and the bottom wall 3 and the connection position of the inner wall 2 and the bottom wall 3. In addition, the reinforcing protrusion 9 is arranged on the outer side of the bottom wall 3 (i.e. Figure 5The bottom surface of the middle bottom wall 3 is provided with a recessed groove 301 recessed inwardly of the bottom wall 3, and the reinforcing protrusions 9 arranged at both ends of the bottom wall 3, when the rubber strip is installed on the door plate lower body 100 and cooperates with the vehicle body sheet metal 200 when the door plate lower body 100 is closed, only the bottom of the reinforcing protrusion 9 contacts and abuts against the vehicle body sheet metal 200. Compared with the bottom surface of the bottom wall 3 being provided with a flat structure, the reinforcing protrusion 9 in the embodiment cooperates with the vehicle body sheet metal 200 in a sealing manner, even if there is a dimensional error or machining error in a local position of the vehicle body sheet metal 200, the reinforcing protrusion 9 can be extruded and deformed into the recessed groove 301 to automatically tightly fit the vehicle body sheet metal 200 when extruded, thereby effectively ensuring the sealing performance; and the reinforcing protrusion 9 is mainly in contact and worn by the vehicle body sheet metal 200 during use, which can avoid the rubber strip body from being rapidly worn and invalid, thereby effectively prolonging the service life of the rubber strip.

[0047] The above is only an embodiment of the present application, and the well-known specific technical solutions and / or common knowledge in the scheme are not described in detail. It should be noted that for those skilled in the art, without departing from the technical scheme of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific embodiments and the like in the specification can be used to explain the content of the claims.

Claims

1. A vehicle door panel sealing apparatus, characterized by: The rubber strip comprises a U-shaped cross section, the U-shaped cross section is composed of an outer wall, an inner wall and a bottom wall connected between the outer wall and the inner wall, an outer elastic clamping rib is arranged on the side of the outer wall facing the inner wall, an inner elastic clamping rib is arranged on the side of the inner wall facing the outer wall, a clamping gap is arranged between the outer elastic clamping rib and the inner elastic clamping rib, and an elastic deformation space is arranged between the outer elastic clamping rib, the inner elastic clamping rib and the bottom wall.

2. A vehicle door panel sealing device as defined in claim 1, wherein: The end of the outer elastic clamping rib away from the outer wall and the end of the inner elastic clamping rib away from the inner wall are both inclined to the bottom wall.

3. A vehicle door panel sealing device as defined in claim 1, wherein: The number of the outer elastic clamping ribs is at least two, and the number of the inner elastic clamping ribs is greater than that of the outer elastic clamping ribs, and the adjacent outer elastic clamping ribs and the adjacent inner elastic clamping ribs are arranged at intervals.

4. A vehicle door panel sealing arrangement according to claim 3, wherein: The outer elastic clamping rib and the inner elastic clamping rib are arranged at intervals along the arrangement direction of the outer elastic clamping rib.

5. A vehicle door panel sealing device as defined in claim 3, wherein: The inner elastic clamping rib close to the bottom wall is a matching clamping rib, and an inclined fitting surface matched with the end surface of the connecting piece is arranged on the side of the matching clamping rib away from the bottom wall.

6. A vehicle door panel sealing device as defined in claim 3, wherein: The thickness of the inner wall is greater than that of the outer wall, and the inner wall is provided with a buffer cavity arranged along the length direction of the rubber strip.

7. A vehicle door panel sealing arrangement according to claim 6, wherein: The number of the buffer cavities is multiple, and the multiple buffer cavities are arranged at intervals along the arrangement direction of the inner elastic clamping rib, and a partition rib is arranged between the adjacent buffer cavities.

8. A vehicle door panel sealing apparatus as defined in claim 1, wherein: The outer side of the bottom wall close to the middle position is provided with a recessed groove recessed into the bottom wall.

9. A vehicle door panel sealing arrangement according to claim 8, wherein: The outer side of the bottom wall close to the two ends is provided with a reinforcing protrusion protruding out of the rubber strip.

10. A door panel sealing device according to any one of claims 1 to 9, wherein: The rubber strip is fixedly connected with a U-shaped metal elastic sheet matched with the U-shaped cross section of the rubber strip.

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