Weather strip for automobile

Abstract

To suppress bending deformation of a hollow seal part in a crushing direction when a weather strip is attached to a vehicle body opening edge, and to suppress increase in cost while improving efficiency of manufacturing work and assembling work.SOLUTION: A hollow seal part is provided on an inner surface of a connecting part 16 of a welt part 12, and both end edges of a beam part 23 are connected to inner surfaces of a vehicle inside side and a vehicle outside side part 13a, 13b of the hollow seal part. A block-like projection part 24 is provided at a nearly central position in the cross direction of the beam part, and the lower end face 24a of the projection part is formed so as to abut on the upper face 16a of the connecting part at a bending corner part in the lateral direction or the longitudinal direction of the flange part.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an automotive weatherstrip that is attached to a trunk room opening or a back door (tailgate) opening, which is an opening on the vehicle body side, and elastically contacts the trunk lid or back door, which is an opening / closing body, to seal the interior and exterior of the vehicle. [Background technology]

[0002] BACKGROUND ART A known example of this type of conventional weather strip for an automobile (hereinafter simply referred to as a weather strip) for a trunk room opening or a back door opening is that described in Patent Document 1.

[0003] FIG. 1 is a perspective view showing an automobile trunk opening to which the weather strip of the present invention and a conventional weather strip are attached, and FIG. 8 is a cross-sectional view taken along line DD in FIG. 1 showing the conventional weather strip.

[0004] As shown in Figures 1 and 8, the weatherstrip 1 described in this publication is attached, for example, to the periphery of a trunk room opening 01 that is opened and closed by a trunk lid 02, and comprises a welt portion 2 formed with a roughly U-shaped cross section by connecting a pair of side walls 3a, 3b on the inside and outside of the vehicle with a connecting portion 4, a hollow seal portion 5 formed integrally with the outer surface of the connecting portion 4, and a pair of cover lips 6a and seal lips 6b formed integrally with the outer surfaces of each side wall 3a, 3b of the welt portion 2.

[0005] As shown in Figure 8, the welt portion 2 has four retaining lips 7a, 7b, 8a, 8b on the opposing inner surfaces of each side wall 3a, 3b, which elastically contact and fit into both side surfaces of the flange portion 04 of the body panel 03 located around the trunk room opening 01.

[0006] The hollow seal portion 5 has a cross section that is approximately rhombic and circular, and is integrally joined to the upper surface of the connecting portion 4 by a pair of joining portions 5b, 5b at both ends on the fixed end side, and has a protrusion 5c that protrudes outward at an angle on the outer surface of the tip portion 5a. A pad 9 is inserted into the interior 5d of the hollow seal portion 5, and the pad 9 is fixed to the interior 5d by a fixing pin 10 that is inserted from the outer surface to the pad 9.

[0007] The pad 9 is made of sponge rubber and formed into a cylindrical shape that is long in the axial direction, and is inserted into the interior 5d of the hollow seal portion 5 with its outer surface abutting the inner surface of the interior 5d of the hollow seal portion 5. The fixing pin 10 is made of, for example, a synthetic resin material and is formed into a substantially U-shape, with engaging portions 10b, 10b at both ends of the base 10a that are inserted into and engaged with the interior of the pad 9.

[0008] The weatherstrip 1 is attached by fitting and holding the welt portion 2 to the flange portion 04 of the trunk room opening 01 via each retaining lip 7a, 7b, 8a, 8b, and when the trunk lid 02 is closed, the hollow seal portion 5 is compressed and deformed from the tip portion 5a side, and a predetermined reaction force (surface pressure) seals between the periphery of the trunk room opening 01 and the trunk lid 02.

[0009] In addition, the pad 9 inserted into the interior 5d of the hollow seal portion 5 increases the rigidity of the hollow seal portion 5 and suppresses bending deformation of the hollow seal portion 5 in the crushing direction when the welt portion 2 is attached to the flange portion 04 of the trunk room opening 01.

[0010] That is, the flange portion 04 on the periphery of the trunk room opening 01 has a small radius of curvature at the vertically bent corner portion at part B and the horizontally bent corner portion at part C in FIG. 1 due to the shape of the trunk room opening 01. Therefore, when the weatherstrip 1 is bent at each corner portion at parts B and C, the difference in circumferential length between the tip end 5a of the hollow seal portion 5 and the neutral axis, whose length does not change, becomes large. As a result, the hollow seal portion 5 deforms in a direction that reduces the difference in circumferential length, that is, it becomes prone to bending and deformation in the crushing direction. As a result, the sealing performance of the hollow seal portion 5 is reduced.

[0011] Therefore, as in the invention of Patent Document 1, a pad 9 is inserted into the interior 5d of the hollow seal portion 5 to increase the rigidity of the hollow seal portion 5 and suppress bending deformation in the crushing direction of the hollow seal portion 5 at the bent corners of the flange portion 04 when the weatherstrip 1 is attached, thereby suppressing deterioration of sealing performance. In addition, a fixing pin 10 is used to restrict inadvertent axial movement of the pad 9 inside the hollow seal portion 5 d. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Patent No. 6166090 Summary of the Invention [Problem to be solved by the invention]

[0013] However, in the prior art invention described in the publication, although it is possible to suppress flexural deformation of the hollow seal portion 5 when attaching the weatherstrip 1 to the bent corner portion of the flange portion 04 by inserting the pad 9 into the interior 5d of the hollow seal portion 5, it is necessary to mold the pad 9 separately from the hollow seal portion 5 in a separate process, and this pad must be inserted into the interior 5d of the hollow seal portion 5. Moreover, not only is a fixing pin 10 required to fix the pad 9 inside the hollow seal portion 5, but it also requires the work of inserting the engaging portions 10b, 10b at both ends of this fixing pin 10 into the pad 9 from the outside of the hollow seal portion 5 and fixing it.

[0014] This makes the manufacturing and assembly of the entire weatherstrip complicated, reducing the efficiency of the manufacturing and assembly work and necessitating a rise in costs.

[0015] The present invention was devised in consideration of the technical problems with the conventional automotive weatherstrips described above, and aims to provide an automotive weatherstrip that can suppress bending deformation in the crushing direction of the hollow sealing portion when the weatherstrip is attached to the edge of an opening in the vehicle body, and that can suppress cost increases while improving the efficiency of manufacturing and assembly work. [Means for solving the problem]

[0016] The invention described in claim 1 of the present application is an automotive weatherstrip comprising a welt portion having a generally U-shaped cross section that is fitted onto a flange portion on the periphery of a vehicle body opening, and a hollow seal portion having a generally circular cross section that is provided on the outer surface of the welt portion via a pair of connecting legs, and that seals between the vehicle body opening and the opening / closing body by being pressed against and deforming the hollow seal portion when the opening / closing body is closed, A beam portion is provided inside the hollow seal portion, with both end edges connected to the inner and outer sides of the inner surface of the hollow seal portion in a bridging state, and a block-shaped protrusion is provided at approximately the center position in the width direction between the both end edges of the beam portion, so that when the welt portion is attached to the flange portion, the tip surface of the protrusion is formed so as to be able to abut against the outer surface of the welt portion at the corner portion bent horizontally or vertically of the flange portion. [Effects of the Invention]

[0017] According to the invention described in claim 1 of the present application, it is possible to suppress the deflection and deformation of the hollow sealing portion when attaching the weatherstrip to the edge of the vehicle body opening, and to suppress increases in manufacturing and assembly costs while improving the efficiency of manufacturing and assembly work. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view showing an automobile trunk room opening to which the present invention and a conventional weather strip are attached. [Figure 2] 2 is a cross-sectional view taken along line AA in FIG. 1, showing the weatherstrip of the first embodiment of the present invention. FIG. [Figure 3] 2 is a vertical cross-sectional view showing a state in which the weather strip of the present embodiment is attached to part B in FIG. 1. FIG. [Figure 4] 2 is a vertical cross-sectional view showing a state in which the weatherstrip of the present embodiment is attached to part B in FIG. 1 and the trunk lid is closed, causing the weatherstrip to be compressed and deformed. FIG. [Figure 5] FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, showing a second embodiment of the present invention. [Figure 6] 2 is a vertical cross-sectional view showing a state in which the weather strip of the present embodiment is attached to part B in FIG. 1. FIG. [Figure 7] 2 is a vertical cross-sectional view showing a state in which the weatherstrip of the present embodiment is attached to part B in FIG. 1 and the trunk lid is closed, causing the weatherstrip to be compressed and deformed. FIG. [Figure 8]FIG. 2 is a cross-sectional view taken along line DD in FIG. 1 showing a conventional weatherstrip. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of an automotive weatherstrip according to the present invention will now be described with reference to the drawings. This weatherstrip, like the conventional weatherstrip described above, is applied to a vehicle body opening, for example, attached to the periphery of a trunk opening.

[0020] Figure 2 shows a weatherstrip of the first embodiment of the present invention, and is a cross-section taken along line AA in Figure 1, Figure 3 is a longitudinal cross-section showing the weatherstrip of this embodiment attached to part B in Figure 1, and Figure 4 is a longitudinal cross-section showing the weatherstrip of this embodiment attached to part B in Figure 1 when the trunk lid is closed and the weatherstrip is compressed and deformed.

[0021] As described above, as shown in Fig. 2, a flange portion 04 of a vehicle body panel 03 is formed upright around the trunk room opening 01 on the vehicle body side shown in Fig. 1, and a weatherstrip 11 is attached to this flange portion 04. In Fig. 2, the right side of the flange portion 04 is on the inside of the vehicle, and the left side is on the outside of the vehicle.

[0022] The weatherstrip 11 includes a welt portion 12 with a generally U-shaped cross section that is fitted and held in the flange portion 04, and a hollow seal portion 13 that is formed integrally with the welt portion 12. When the trunk lid 02, which serves as an opening / closing body, is closed, the hollow seal portion 13 is pressed against the trunk lid 02 and is deflected and deformed, thereby sealing the trunk room opening 01.

[0023] The welt portion 12 is molded entirely from a hard solid rubber material and has an interior sidewall 14, an exterior sidewall 15, and an upper connecting portion 16 connecting the upper ends of the pair of sidewalls 14, 15, forming a substantially U-shaped cross section. To ensure rigidity, a similarly shaped core material 17 made of metal or resin is embedded inside the welt portion 12 along its length. A pair of retaining lips 18a, 18b, 19a, 19b protrude from the opposing inner surfaces of each sidewall 14, 15 of the welt portion 12. Inserting the welt portion 12 into the flange portion 04 causes the retaining lips 18a-19b to flex and clamp the flange portion 04 from both sides, thereby fitting and holding the welt portion 12 to the flange portion 04.

[0024] The connecting portion 16 is formed in an arc-shaped, nearly flat plate shape, and a high-sealing portion 20 made of, for example, butyl sponge rubber is adhesively fixed to the inner bottom surface opposite the top surface 16a on the hollow seal portion 13 side. The high-sealing portion 20 has a substantially elliptical cross section that is elongated in the width direction of the connecting portion 16 and extends longitudinally from the approximate center of the width direction of the inner surface of the connecting portion 16. Furthermore, when the welt portion 12 is inserted into the flange portion 04 and fitted, the tip of the flange portion 04 is inserted into the high-sealing portion 20, further improving the sealing function between the interior and exterior of the vehicle. The high-sealing portion 20 can also be formed from other sponge rubber materials.

[0025] A cover lip 21 protrudes from the upper end of the outer surface of the interior side wall 14 of the welt portion 12. This cover lip 21 is used, for example, to conceal or provide continuity to the end portion of a trim part T, such as a finisher, that is attached to the interior side of the vehicle.

[0026] A seal lip 22 is formed integrally with the lower end of the outer surface of the vehicle-exterior side wall 15 of the welt portion 12. When the weatherstrip 11 is properly attached to the flange portion 04, the lower end surface 22a of this seal lip 22 abuts against the flat panel surface of the vehicle body panel 03 other than the flange portion 04, thereby providing a sealing function. Note that a portion of the lower side of the cover lip 21 is formed from a solid rubber material, while the upper side and the seal lip 22 are molded from a sponge rubber material.

[0027] The hollow seal portion 13 is made of soft sponge rubber and has a generally diamond-shaped cross section. It has an inner portion 13a and an outer portion 13b, and the connecting tips 13e of the portions 13a, 13b extend obliquely toward the outside of the vehicle. Connecting legs 13c, 13d at the lower ends of the portions 13a, 13b are connected to the inside and outside shoulders of the upper surface 16a of the connecting portion 16.

[0028] 2 to 4, a plate-shaped beam portion 23 is provided along the longitudinal direction of the weatherstrip 11 at the center of the interior of the hollow seal portion 13. Like the hollow seal portion 13, this beam portion 23 is made of sponge rubber and is molded integrally with the hollow seal portion 13 during extrusion molding of the weatherstrip 11. Both widthwise ends 23a, 23b of the beam portion 23 are joined to the inner surfaces of both portions 13a, 13b at approximately the center in the up-down direction in FIG. 2, and are arranged in a bridging state. The beam portion 23 is formed to have a plate thickness smaller than the wall thicknesses of both portions 13a, 13b of the hollow seal portion 13.

[0029] Furthermore, a protrusion 24 is integrally formed at approximately the center in the width direction of the beam portion 23. As shown in Fig. 2, this protrusion 24 is formed together with the beam portion 23 from the same sponge rubber material during extrusion molding. The protrusion 24 is formed in the shape of a block with a substantially rectangular cross section, protrudes from the underside of the beam portion 23 in the figure toward the connecting portion 16, and is formed along the longitudinal direction of the beam portion 23. The length L1 in the width direction of this protrusion 24 is set to approximately half the length of the entire width length L of the beam portion 23 (the length between both end portions 23a, 23b), and the presence of the protrusion 24 increases the overall rigidity of the beam portion 23.

[0030] 2, when the weatherstrip 11 is attached to the flange portion 04 via the welt portion 12, the lower end surface 24a of the protrusion 24, which is the leading end surface, faces the upper surface 16a of the connecting portion 16 of the welt portion 12 at the straight portion of the flange portion 04 (the portion indicated by line AA in FIG. 1) with a small gap C between them without abutting against the upper surface 16a of the connecting portion 16. However, at the corner portions of the flange portion 04 bent in the vertical and horizontal directions at portions B and C in FIG. 1, the lower end surface 24a of the protrusion 24 slightly abuts against the upper surface 16a of the connecting portion 16 to support the beam portion 23, as shown in FIG. 3. In other words, the abutment of the lower end surface 24a of the protrusion 24 against the upper surface 16a of the connecting portion 16, combined with the improved rigidity provided by the presence of the protrusion 24, restricts the beam portion 23 from extending in the width direction (towards both ends 23a, 23b).

[0031] Furthermore, as shown in Figure 4, when the trunk lid 02 is closed from above the weatherstrip 11 attached to the flange portion 04, the hollow seal portion 13 is significantly bent and deformed in the crushing direction (compression direction), and as a result, the lower end surface 24a of the protrusion 24 is pressed against the upper surface 16a of the connecting portion 16 and the connecting leg portion 13d via the beam portion 23. [Effects of this embodiment] The effects of the weatherstrip 11 according to this embodiment will be described below. The beams 23 and protrusions 24 provide high support rigidity for the hollow seal portion 13 in this weatherstrip 11. Therefore, when the weatherstrip 11 is attached to the flange 04 of the vehicle body panel 03 at the trunk opening 01 shown in FIG. 1 via the welt 12, the hollow seal portion 13 remains free and undeformed at the straight portion of the flange 04, as shown in FIG. 2. In other words, the beams 23 remain substantially horizontal without deformation, and the lower end surfaces 24a of the protrusions 24 also face the upper surfaces 16a of the connecting portions 16 with a small gap C between them without abutting against them. Therefore, the hollow seal portion 13 maintains its diamond-shaped circular shape without being bent or deformed in the direction of collapse.

[0032] On the other hand, at the corners where the welt portion 12 shown in parts B and C of Figure 1 is bent in a curved shape in the vertical or horizontal direction, as shown in Figure 3, the hollow seal portion 13 attempts to bend and deform in the crushing direction, but the beam portion 23 and the protrusion 24 act as inward tensioning forces on the inside-side portion 13a and the outside-side portion 13b of the hollow seal portion 13, increasing the support rigidity and suppressing excessive bending and deformation of the hollow seal portion 13 in the crushing direction.

[0033] In particular, at the corners B and C in Figure 1 where the horizontal or vertical radius of curvature of the flange portion 04 is larger than a predetermined value, the lower end surface 24a of the protrusion 24 of the beam portion 23 abuts against the upper surface 16a of the connecting portion 16 of the welt portion 12, further reinforcing the tensioning force of the beam portion 23, thereby effectively suppressing excessive bending deformation of the hollow seal portion 13.

[0034] Furthermore, in this embodiment, the beam portion 23 and the protrusion 24 are molded together with the welt portion 12 and hollow seal portion 13 during the extrusion molding of the weatherstrip 11. Therefore, compared to the conventional pads and fixing pins described in the above publication, which must be molded in a separate process from the weatherstrip, the manufacturing and assembly work is easier and manufacturing and assembly costs can be reduced.

[0035] Furthermore, when the trunk lid 02 is closed and compresses and deforms the hollow seal portion 13, as shown in Figure 4, this deformation causes the protrusions 24 to press against the upper surface 16a of the connecting portion 16 and the connecting leg portion 13d via the beams 23, applying a reaction force against the deformation direction of the hollow seal portion 13. Therefore, the hollow seal portion 13 is prevented from being excessively crushed and deformed by the combined action of the beams 23 and the protrusions 24. This prevents a decrease in the sealing performance of the hollow seal portion 13, ensuring sufficient watertightness.

[0036] Furthermore, in this state, the protrusion 24 abuts against the upper surface 16a of the connecting portion 16 and the connecting leg portion 13d, thereby suppressing excessive crushing deformation of the hollow seal portion 13, and the hollow seal portion 13 functions as a damper rubber that suppresses interference between the trunk lid 02 and the flange portion 04. This makes it possible to suppress the generation of abnormal noise caused by interference between the trunk lid 02 and the flange portion 04 when the vehicle vibrates.

[0037] Furthermore, by forming the beam portion 23 and the protrusion 24 from the same soft sponge rubber material as the hollow seal portion 13, it is possible to suppress an excessive increase in reaction force from the hollow seal portion 13 when the trunk lid 02 is closed and the hollow seal portion 13 is compressed and deformed. This makes it possible to improve the sealing performance of the hollow seal portion 13 while preventing deterioration in the closing ability of the trunk lid 02. Second Embodiment Figures 5, 6 and 7 show a second embodiment of the present invention, in which the basic configuration of the welt portion 12, hollow seal portion 13, beam portion 23, protrusion 24, etc. is the same as that of the first embodiment, but the difference is that the two connecting legs 13c and 13d of the hollow seal portion 13 are formed from the same hard solid rubber material as the connecting portion 16, from the upper surface 16a of the connecting portion 16 to a predetermined length.

[0038] 5, the hollow seal portion 13 has two connecting legs 13c, 13d, where the inside portion 13a and the outside portion 13b connect to both shoulders of the upper surface 16a of the connecting portion 16, and these connecting legs 13c, 13d are formed to extend slightly toward the tip end 13e, and are made of the same hard solid rubber material as the connecting portion 16. Furthermore, the length L2 from the upper surface 16a of the connecting portion 16 to the tip end of the inside connecting leg 13c is set longer than the length L3 from the upper surface of the connecting portion 16 to the tip end of the outside connecting leg 13d.

[0039] As mentioned above, when the welt portion 12 is fitted and attached to the flange portion 04, at the corners of the flange portion 04 at locations B and C in Figure 1, where the radius of curvature in the vertical and horizontal directions is large, the hollow seal portion 13 experiences a greater amount of crushing deformation at the vehicle interior portion 13a than at the vehicle exterior portion 13b.

[0040] Therefore, in the second embodiment, the length L2 of the connecting leg portion 13c on the vehicle interior side is made longer than the length L3 of the connecting leg portion 13d on the vehicle exterior side. This reduces the difference in circumferential length between the portion 13a on the vehicle interior side and the portion 13b on the vehicle exterior side of the hollow seal portion 13, thereby reducing the amount of crushing deformation of the hollow seal portion, as shown in Figure 6.

[0041] In other words, by making the length of the connecting leg 13c of the interior portion 13a, where the amount of crushing deformation of the hollow seal portion 13 is large when the welt portion 12 is attached to the flange portion 04, longer than the length of the connecting leg 13d of the exterior portion 13b, where the amount of crushing deformation is small, the interior portion 13a can be made more rigid than the exterior portion 13b. This allows the amount of crushing deformation of the interior portion 13a of the hollow seal portion 13 to be kept small.

[0042] Furthermore, when the trunk lid 02 is closed and compresses and deforms the hollow seal portion 13, as shown in Figure 7, this deformation causes the protrusion 24 to press against the upper surface 16a of the connecting portion 16 and the connecting leg 13d made of solid rubber via the beam 23, applying a reaction force against the deformation direction of the hollow seal portion 13. Therefore, the hollow seal portion 13 is further prevented from excessive crushing deformation by the supporting rigidity of the beam 23 and the protrusion 24, as well as the relatively high rigidity of both connecting legs 13c, 13d. This prevents a decrease in the sealing performance of the hollow seal portion 13, ensuring sufficient watertightness.

[0043] Furthermore, by suppressing excessive crushing deformation of the hollow seal portion 13 due to the connecting legs 13c, 13d, etc., the hollow seal portion 13 further functions as a damper rubber that suppresses interference between the trunk lid 02 and the flange portion 04. This makes it possible to suppress the generation of abnormal noise caused by interference between the trunk lid 02 and the flange portion 04 when the vehicle vibrates.

[0044] The other configurations are the same as those of the first embodiment, and therefore the same effects as those of the first embodiment described above can be obtained.

[0045] The present invention is not limited to the configurations of the first and second embodiments, and the weather strip 11 can be applied to areas other than the periphery of the trunk room opening 01, such as the periphery of the back door opening.

[0046] The shape, size, height, etc. of the beams 23 and the protrusions 24 can also be changed depending on the attachment location and specifications of the weatherstrip 11. In addition, although the beams 23 and the protrusions 24 are made of sponge rubber in each embodiment, it is also possible to use hard rubber material or hard resin material for a portion thereof.

[0047] It is also possible to provide the beam portions 23 and protrusions 24 inside the hollow seal portion 13 only at positions corresponding to the horizontal and vertical corners of the flange portion 04, rather than throughout the entire interior of the hollow seal portion 13.

[0048] As an example of the automotive weather strip based on the embodiment described above, there are the following aspects.

[0049] One such form is an automotive weatherstrip comprising a welt portion having an approximately U-shaped cross section that is fitted into and attached to a flange portion on the periphery of a vehicle body opening, and a hollow seal portion having an approximately circular cross section that is provided on the outer surface of the welt portion via a pair of connecting legs; when an opening / closing body that opens and closes the vehicle body opening is closed, the hollow seal portion is pressed against and deformed to seal the space between the vehicle body opening and the opening / closing body; inside the hollow seal portion, a beam portion is provided whose both end edges are connected to the inner surface of the hollow seal portion on the inside and outside of the vehicle, and a block-shaped protrusion is provided at approximately the center of the width between the both end edges of the beam portion; when the welt portion is attached to the flange portion, the tip surface of the protrusion is capable of abutting or not abutting the outer surface of the welt portion depending on the size of the lateral or longitudinal radius of curvature of the flange portion.

[0050] According to this aspect of the invention, when the welt portion is attached to the flange portion of the vehicle body opening, the inside and outside sides of the hollow seal portion are supported by the tensioning force of the beam portion and the protrusion, thereby suppressing bending deformation of the hollow seal portion in the crushing direction.

[0051] In particular, in areas where the radius of curvature of the flange in the horizontal or vertical direction is greater than a predetermined value, the tip surfaces of the protrusions of the weatherstrip attached thereto abut against the outer surface of the welt, which further reinforces the tension of the beam and effectively prevents excessive flexural deformation of the hollow seal.

[0052] Furthermore, the beams and protrusions can be molded together with the welts and hollow seals during the extrusion of the weatherstrip, which simplifies manufacturing and assembly work and reduces manufacturing and assembly costs compared to the conventional pads and fixing pins described in the publication, which must be molded in a separate process from the weatherstrip.

[0053] More preferably, when the opening / closing body is closed and pressed against the hollow seal portion, the tip end surface of the protrusion abuts against the outer surface of the welt portion.

[0054] When the opening / closing body is closed and the hollow seal is compressed and deformed, the deformation causes the protrusions to abut against the outer surface of the welt via the beams, applying a reaction force to the hollow seal in the direction of deformation. As a result, the hollow seal is prevented from being excessively deformed by the combined action of the protrusions and beams, thereby preventing a decrease in sealing performance.

[0055] Furthermore, the protrusions come into contact with the outer surface of the welt as the hollow seal undergoes compressive deformation, preventing excessive crushing deformation of the hollow seal, and thus functioning as damper rubber to prevent interference between the opening / closing body and the vehicle body panel (flange portion), thereby reducing the generation of interference noise between the opening / closing body and the vehicle body panel.

[0056] More preferably, the beams and the protrusions are made of the same sponge material as the hollow seal portion.

[0057] More preferably, the connecting legs on the inside and outside of the vehicle relative to the welt portion of the hollow seal portion are formed from the same hard material as the welt portion, and the length of the connecting leg on the inside of the vehicle from the outer surface of the welt portion to the tip surface on the hollow seal portion side is set to be longer than the length of the connecting leg on the outside of the vehicle from the outer surface of the welt portion to the tip surface on the hollow seal portion side.

[0058] By making the length of the connecting leg at the interior portion of the hollow seal, where the amount of collapse is greater when the welt is attached to the flange, longer than the length of the connecting leg at the exterior portion, where the amount of collapse is smaller, the rigidity of the interior portion can be increased, thereby minimizing the amount of collapse deformation of the hollow seal at the interior portion. [Explanation of symbols]

[0059] 01...Trunk room opening (vehicle body opening) 02... Trunk lid (opening and closing body) 03...Body panel 04...Flange 11...Weather strip 12...Welt 13...Hollow seal part 13a...Inside of the car 13b...Exterior part of the vehicle 13c...Connecting leg on the inside of the car 13d...Connecting leg on the outside of the vehicle 14·15…Each side wall 16...Connection part 16a…Top surface 17...Core material 18·19…Retaining lip 23...beam part 24...Protrusion B: Vertical bent corner C: Horizontal bend corner

Claims

1. An automotive weatherstrip comprising: a welt portion having a generally U-shaped cross section that is fitted onto a flange portion on the periphery of a vehicle body opening; and a hollow seal portion having a generally circular cross section that is provided on the outer surface of the welt portion via a pair of connecting legs; and when an opening / closing body that opens and closes the vehicle body opening is closed, the hollow seal portion is pressed against and deformed to form a seal between the vehicle body opening and the opening / closing body, a beam portion disposed inside the hollow seal portion, the beam portion having both end edges connected to the vehicle interior side and the vehicle exterior side of the inner surface of the hollow seal portion in a bridging state; a block-shaped protrusion is provided at a substantially central position in the width direction between the both end edges of the beam portion; A weatherstrip for an automobile, characterized in that when the welt portion is attached to the flange portion, the tip surface of the protrusion is formed so as to be able to abut against the outer surface of the welt portion at the horizontally or vertically folded corner portion of the flange portion.

2. 2. The weather strip for an automobile according to claim 1, A weatherstrip for an automobile, characterized in that when the opening / closing body is closed and pressed against the hollow seal portion, the tip surface of the protrusion abuts against the outer surface of the welt portion.

3. 3. The weather strip for an automobile according to claim 2, A weather strip for an automobile, wherein the beam portion and the protrusion are formed from the same sponge material as the hollow seal portion.

4. 2. The weather strip for an automobile according to claim 1, the hollow seal portion has inner and outer connecting legs for connecting to the welt portion, each of which is made of the same hard material as the welt portion; The length of the connecting leg portion on the vehicle interior side from the outer surface of the welt portion to the tip surface on the hollow seal portion side is set to be longer than the length of the connecting leg portion on the vehicle exterior side from the outer surface of the welt portion to the tip surface on the hollow seal portion side.

Images