Weatherstrip

Abstract

To reduce sound entering a vehicle and prevent difficulty from arising in closing a door, etc. without increasing types of materials forming a weather strip.SOLUTION: A weather strip 17 comprises: a hollow seal portion 22 which can be compressed and deformed by coming into contact with a door 18 when the door 18 is closed; and an attachment portion 21 for attaching the hollow seal portion 22 to a peripheral edge of an opening portion 14 of a vehicle body 11. The hollow seal portion 22 comprises: a head side wall portion 31 located on the opposite side to the attachment portion 21; and a bending portion 32 which adjoins both sides of the head side wall portion 31 and which is formed to be easier to bend than another part of the hollow seal portion 22. Projecting portions 33 that project from an inner wall surface of the head side wall portion 31 are formed within the hollow seal portion 22 from the same material as the hollow seal portion 22. Each projecting portion 33 is formed in such a way that a tip end of the projecting portion 33 does not abut an inner wall surface of the hollow seal portion 22 when the hollow seal portion 22 is compressed and deformed in a state that the door 18 is closed.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a long weatherstrip that seals between the periphery of an opening in a vehicle body and an opening / closing member, such as a door, that opens and closes the opening when the opening / closing member is closed. [Background technology]

[0002] Generally, a weatherstrip is attached to either the periphery of a vehicle opening or an opening / closing member such as a door, and has a hollow seal portion that is compressively deformable by contacting the other of the periphery of the vehicle opening or the opening / closing member when the opening / closing member is closed. One known weatherstrip of this type, as described in Patent Document 1 (JP 2010-58637 A), has a hollow cylindrical wall portion made of a different material within the hollow seal portion, and the inner peripheral surface of the cylindrical wall portion is formed with a plurality of corrugated irregularities to improve sound insulation. Furthermore, in the weatherstrip of Patent Document 1, the cylindrical wall portion is made of a sponge material with a specific gravity lower than that of the molding material of the hollow seal portion, thereby preventing a large compressive load on the hollow seal portion when the door is closed and preventing deterioration of door closing performance. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-58637 Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, weatherstrips are formed by extrusion molding of polymer material, but in the configuration of Patent Document 1, the hollow sealing portion and the cylindrical wall portion inside it are formed from different materials, which requires an additional extrusion molding device to be used when extruding the weatherstrip, resulting in the disadvantage of making the molding equipment more complex and increasing production costs.

[0005] Therefore, the problem that the present invention aims to solve is to provide a weatherstrip that can reduce the noise that enters the vehicle interior without increasing the types of material used to form the weatherstrip, and can prevent an increase in the compressive load on the hollow seal portion when the opening and closing member is closed, thereby preventing a deterioration in the closing ability of the opening and closing member. [Means for solving the problem]

[0006] In order to solve the above problem, the invention of claim 1 provides a long weatherstrip that seals between the periphery of an opening in a vehicle body and an opening / closing member that opens and closes the opening when the opening / closing member is closed, the weatherstrip being attached to an attachment location on either the periphery of the opening in the vehicle body or the opening / closing member, and having a hollow seal portion that is compressively deformable by contacting the other of the periphery of the opening in the vehicle body or the opening / closing member when the opening / closing member is closed, and an attachment portion for attaching the hollow seal portion to the attachment location, the hollow seal portion having a head side wall portion located opposite to the attachment portion, and bending portions that are adjacent to both sides of the head side wall portion and are formed to bend when the opening / closing member is closed, and within the hollow seal portion At least one of the inner wall surfaces of the hollow seal portion excluding the bent portion A protruding portion protruding from the inner wall surface of the head side wall portion is formed of the same material as the hollow seal portion, and the protruding portion is The protrusion has a height of 0.5 mm or more and is formed in a lip shape extending into the hollow seal portion, and the protrusion is formed at a plurality of locations on the inner wall surface of at least the head side wall portion at predetermined intervals, When the opening / closing member is closed, the hollow seal portion is compressed and deformed. The space inside the hollow seal portion is not blocked by the protrusion. The tip of the protrusion is in contact with the inner wall surface of the hollow seal portion. and other protrusions It is characterized in that it is formed so as not to come into contact with the other parts.

[0007] In this configuration, a hollow cylindrical wall portion made of a different material is not disposed inside the hollow seal portion, The protrusion is formed on the inner wall surface of the hollow seal portion excluding the bent portion, Since no protrusions protrude from the bent portion of the hollow seal portion, it is possible to prevent an increase in the compressive load of the hollow seal portion when the opening / closing member is closed, thereby preventing deterioration of the closing ability of the opening / closing member. at leastSince the protruding portion protruding from the inner wall surface of the head side wall portion is formed from the same material as the hollow seal portion, there is no need to increase the types of materials used to mold the weatherstrip, and there is no need to increase the number of extrusion molding devices used to extrude the weatherstrip, thereby keeping production costs low.

[0008] Furthermore, the protrusion is formed so that sound entering the hollow seal portion from the head side wall portion of the hollow seal portion can be easily hit. at least The protrusions protrude from the inner wall surface of the head side wall portion. Therefore, when the opening / closing member is closed, sound that enters the hollow seal portion hits the protrusions in the hollow seal portion, and the energy of the sound that has entered the hollow seal portion is attenuated, thereby reducing the sound that enters the vehicle interior. Moreover, when the opening / closing member is closed and the hollow seal portion is compressed and deformed, the tip of the protrusions in the hollow seal portion hits the inner wall surface of the hollow seal portion. and other protrusions Because it is formed so as not to come into contact, the space inside the hollow seal is not blocked by the protrusion, which prevents sound that enters the hollow seal from being amplified by reflection and resonance in the narrow space blocked by the protrusion.

[0009] Furthermore ,Tsu The protrusion is formed in a lip shape that extends into the hollow seal portion. Because Sound that has entered the hollow seal portion is more likely to hit the protruding portion, thereby enhancing the effect of reducing noise.

[0010] Also ,Tsu The department is at least Formed at predetermined intervals on multiple locations on the inner wall surface of the head side wall Because This increases the probability that sound that has entered the hollow seal portion will hit the protruding portion, thereby improving the effect of reducing noise.

[0011] In this case, claim 2As shown in the figure, the protrusions may be formed on both the inner wall surface of the head side wall portion and the inner wall surface of other portions of the inner wall surface of the hollow seal portion, and may be configured so that the protrusions do not come into contact with each other when the hollow seal portion is compressed and deformed when the opening / closing member is closed. In this way, the energy of sound that has entered the hollow seal portion can be efficiently attenuated by the multiple protrusions formed on both the inner wall surface of the head side wall portion of the hollow seal portion and the inner wall surface on the opposite side thereof, thereby enhancing the effect of reducing sound.

[0012] Also, claims 3 In this way, the bent portion can be formed thinner than the other portions of the hollow seal portion, which makes it easy to form the bent portion of the hollow seal portion that is more easily bent than the other portions.

[0013] The weather strip of the present invention is as follows: 4 This weatherstrip is preferably applied to a door opening attached to the periphery of an opening in a vehicle body, as shown in the figure. This is because the weatherstrip used in a door opening has a large space within the hollow seal portion, making it easy to form a protrusion. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a side view showing a schematic configuration of an automobile to which a weather strip according to a first embodiment of the present invention is attached. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 showing the weather strip attached to the periphery of the front door opening when the front door is open. [Figure 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. 1 showing the weather strip attached to the periphery of the front door opening when the front door is closed. [Figure 4] FIG. 4 is a view corresponding to FIG. 2 and showing a second embodiment of the present invention. [Figure 5] FIG. 5 is a view corresponding to FIG. 2 and showing a third embodiment of the present invention. [Figure 6]FIG. 6 is a cross-sectional view of a weather strip attached to a front door, showing a fourth embodiment of the present invention. [Figure 7] FIG. 7 is a cross-sectional view of a weather strip attached to the periphery of a back door opening, showing a fifth embodiment of the present invention. [Figure 8] FIG. 8 is a diagram showing the results of an evaluation test of the sound reduction effect of Examples 1 to 3 and the comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, several embodiments in which the present invention is applied to a door opening will be described. [Example]

[0016] A first embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. As shown in FIG. 1, an automobile body 11 is formed by joining together a plurality of panels, such as a roof panel 12 and side panels 13. A weatherstrip 17 (door opening), formed in a long shape by extrusion molding of an elastic polymer material, is attached to flanges 16 (see FIGS. 2 and 3) provided along the peripheries of a front door opening 14 and a rear door opening 15 of the body 11. The front weatherstrip 17 seals between the periphery of the front door opening 14 and a front door 18 (opening / closing member) that opens and closes the front door opening 14 when the front door 18 is closed. The rear weatherstrip 17 seals between the periphery of a rear door opening 15 and a rear door 19 (opening / closing member) that opens and closes the rear door opening 15 when the rear door 19 is closed.

[0017] Next, the configuration of the weatherstrip 17 will be described with reference to FIGS. The weatherstrip 17 in this embodiment is made of, for example, ethylene-propylene-diene rubber (EPDM), but is not limited to this and may be made of any elastic polymer material, such as a thermoplastic synthetic resin (including a thermoplastic elastomer). To reduce the weight of the weatherstrip 17, a foaming agent or microcapsules may be mixed into the polymer material, such as ethylene-propylene-diene rubber. A chemical foaming agent, such as OBSH, may also be used as the foaming agent.

[0018] The weatherstrip 17 has a mounting portion 21 with a U-shaped cross section attached to a flange 16 provided along the periphery of the front door opening 14 (rear door opening 15), and a cylindrical hollow seal portion 22 formed integrally with the mounting portion 21 on the vehicle exterior side. The mounting portion 21 and hollow seal portion 22 extend along the longitudinal direction of the weatherstrip 17 by extrusion molding.

[0019] The mounting portion 21 is integrally formed with an exterior side wall portion 23, an interior side wall portion 24, and a top wall portion 25 connecting both side wall portions 23, 24, and a hollow seal portion 22 is integrally formed on the outer surface of the exterior side wall portion 23. A core material 26 made of a metal plate, a resin plate, or the like and having a generally U-shaped cross section is embedded in the mounting portion 21 by composite extrusion molding so as to straddle both side wall portions 23, 24.

[0020] A plurality of protrusions 27 protruding toward the interior side wall 24 are integrally formed at predetermined intervals on the inner surface of the exterior side wall 23, and a retaining lip 28 protruding obliquely downward toward the exterior side wall 23 is integrally formed on the inner surface of the interior side wall 24. When installing the weatherstrip 17, the installation portion 21 By inserting the flange 16 on the periphery of the front door opening 14 (rear door opening 15) into the gap between the side wall portions 23, 24, the retaining lip 28 abuts against the flange 16 and elastically deforms, and the elastic repulsive force of the retaining lip 28 causes the flange 16 to be sandwiched between the retaining lip 28 and the multiple protrusions 27 of the outer side wall portion 23, thereby attaching the weatherstrip 17 to the flange 16.

[0021] A decorative lip 29 protruding toward the inside of the vehicle is integrally formed on the top wall 25 of the mounting part 21, and this decorative lip 29 covers and hides the gap between the mounting part 21 and the interior material 30 on the inside of the vehicle.

[0022] As shown in Figure 3, the hollow seal portion 22 abuts against the peripheral edge of the front door 18 (rear door 19) and is compressed and deformed when the front door 18 (rear door 19) is closed, thereby sealing between the peripheral edge of the front door 18 (rear door 19) and the peripheral edge of the front door opening 14 (rear door opening 15).

[0023] The hollow seal portion 22 has a head side wall portion 31 located on the opposite side from the attachment portion 21, and bent portions 32 adjacent to both sides of the head side wall portion 31 and formed to be more easily bent than other portions of the hollow seal portion 22. The bent portions 32 are formed to be thinner than other portions of the hollow seal portion 22, making them more easily bent than other portions of the hollow seal portion 22. This allows the easily bent bent portions 32 and other portions of the hollow seal portion 22 to be easily formed by extrusion molding.

[0024] A plurality of lip-shaped protrusions 33 are integrally formed at predetermined intervals from the inner wall surface of the head side wall 31 of the hollow seal portion 22 at multiple locations on the inner wall surface of the head side wall 31. The lip-shaped protrusions 33 protrude into the hollow seal portion 22 from the inner wall surface of the head side wall 31 at multiple locations on the inner wall surface of the hollow seal portion 22. The protrusions 33 are formed so that the tips of the protrusions 33 do not come into contact with the inner wall surface of the hollow seal portion 22 when the hollow seal portion 22 is compressed and deformed when the front door 18 (rear door 19) is closed, and further, the protrusions 33 are formed at positions where they do not come into contact with each other. The protrusions 33 are formed by extrusion molding into a lip shape extending along the longitudinal direction of the weatherstrip 17.

[0025] In this case, in order to allow sound that has entered hollow seal portion 22 from outside the vehicle to easily hit each protrusion 33, it is desirable to set the protrusion length of each protrusion 33 to, for example, 0.5 mm or more within a range in which the tip of each protrusion 33 does not come into contact with the inner wall surface of hollow seal portion 22 when hollow seal portion 22 is compressed and deformed when front door 18 (rear door 19) is closed. This is because the longer the protrusion length of each protrusion 33, the more easily sound that has entered hollow seal portion 22 will hit each protrusion 33.

[0026] Furthermore, a covering portion 34 for improving the abrasion resistance of the surface is formed on the surface of the hollow seal portion 22. This covering portion 34 is formed, for example, from a rubber material with a specific gravity of 1.2 to 1.5, and is formed by co-extrusion molding when the weatherstrip 17 is molded.

[0027] The hollow seal portion 22 and the protrusion portion 33 are formed, for example, from a rubber material having a specific gravity of 0.2 or more and 1.0 or less, and the mounting portion 21, the retaining lip 28 and the protrusion portion 27 are formed, for example, from a rubber material having a specific gravity of 0.6 or more and 1.5 or less.

[0028] In the weatherstrip 17 of the first embodiment described above, a hollow cylindrical wall portion made of a different material is not disposed within the hollow seal portion 22, and the bent portion 32 of the hollow seal portion 22 is formed to bend more easily than other portions, thereby preventing an increase in compressive load on the hollow seal portion 22 when the front door 18 (rear door 19) is closed and preventing deterioration of the closing ability of the front door 18 (rear door 19). Moreover, since the protruding portion 33 protruding from the inner wall surface of the hollow seal portion 22 is formed from the same material as the hollow seal portion 22, there is no need to increase the type of material used to mold the weatherstrip 17, and there is no need to increase the number of extrusion molding devices used to extrude the weatherstrip 17, thereby reducing production costs.

[0029] Furthermore, the protrusion 33 protrudes from the inner wall surface of the head side wall 31 of the hollow seal portion 22 so that sound that has entered the hollow seal portion 22 from the head side wall 31 of the hollow seal portion 22 can easily strike the protrusion 33. Therefore, when sound that has entered the hollow seal portion 22 when the front door 18 (rear door 19) is closed strikes the protrusion 33 inside the hollow seal portion 22, the energy of the sound that has entered the hollow seal portion 22 is attenuated, thereby reducing the sound that enters the vehicle interior. Moreover, the protrusion 33 inside the hollow seal portion 22 is formed so that the tip of the protrusion 33 does not abut against the inner wall surface of the hollow seal portion 22 when the hollow seal portion 22 is compressed and deformed when the front door 18 (rear door 19) is closed. This prevents the space inside the hollow seal portion 22 from being blocked by the protrusion 33, preventing sound that has entered the hollow seal portion 22 from being reflected and resonated in the narrow space blocked by the protrusion 33, resulting in the sound being amplified.

[0030] Furthermore, in this embodiment 1, the protruding portion 33 is formed in a lip shape that extends into the hollow seal portion 22, so that sound that has entered the hollow seal portion 22 is more likely to hit the protruding portion 33, thereby enhancing the effect of reducing sound. Moreover, since multiple protruding portions 33 are formed at predetermined intervals on the inner wall surface of the hollow seal portion 22, the probability that sound that has entered the hollow seal portion 22 will hit the protruding portion 33 is increased, thereby enhancing the effect of reducing sound.

[0031] Furthermore, since the protruding portion 33 does not protrude from the bent portion 32, it is possible to prevent the bent portion 32 from becoming difficult to bend. [Example]

[0032] Next, a second embodiment of the present invention will be described with reference to Fig. 4. However, parts that are substantially the same as those in the first embodiment will be assigned the same reference numerals as those in the first embodiment, and descriptions thereof will be omitted or simplified, and mainly different parts will be assigned different reference numerals and described.

[0033] In the first embodiment, the protrusion 33 protruding into the hollow seal portion 22 was formed only on the inner wall surface of the head side wall portion 31 of the hollow seal portion 22, but in the second embodiment, lip-shaped protrusions 33, 33a are integrally formed on both the inner wall surface of the head side wall portion 31 of the hollow seal portion 22 and the inner wall surface on the opposite side (the outer wall surface of the outer side wall portion 23 of the mounting portion 21) so as to protrude into the hollow seal portion 22. Each of the protrusions 33, 33a has a lip shape extending along the longitudinal direction of the weatherstrip 17 by extrusion molding.

[0034] It should be noted that a protrusion that protrudes into the hollow seal portion 22 may also be formed on the inner wall surface of the hollow seal portion 22 from the bent portion 32 to the vehicle exterior side wall portion 23. In other words, a protrusion that protrudes into the hollow seal portion 22 may also be formed on the inner wall surface of the hollow seal portion 22 in a portion other than the head side wall portion 31.

[0035] In this case, the protruding length and forming position of each protruding portion 33, 33a are set so that when the hollow seal portion 22 is compressed and deformed when the front door 18 (rear door 19) is closed, the tip of each protruding portion 33, 33a does not abut against the inner wall surface of the hollow seal portion 22 and the protruding portions 33, 33a do not abut against each other.

[0036] In the weatherstrip 17 of the present embodiment 2 described above, the energy of sound that has entered the hollow seal portion 22 is efficiently attenuated by the multiple protrusions 33, 33a formed on both the inner wall surface of the head side wall portion 31 of the hollow seal portion 22 and the inner wall surface on the opposite side (the outer wall surface of the outer side wall portion 23 of the mounting portion 21), thereby enhancing the effect of reducing sound. [Example]

[0037] Next, a third embodiment of the present invention will be described with reference to Fig. 5. However, parts that are substantially the same as those in the first embodiment will be assigned the same reference numerals as those in the first embodiment, and descriptions thereof will be omitted or simplified, and mainly different parts will be assigned different reference numerals and described.

[0038] In the first embodiment, the protrusion 33 protruding into the hollow seal portion 22 is formed in a lip shape, but in the third embodiment, a plurality of protrusions 41, each of which protrudes only a small amount into the hollow seal portion 22, are formed integrally at predetermined intervals on the inner wall surface of the head side wall portion 31 of the hollow seal portion 22 using the same material as the hollow seal portion 22. Each protrusion 41 is formed by extrusion molding so as to extend along the longitudinal direction of the weatherstrip 17. Because each protrusion 41 protrudes only a small amount into the hollow seal portion 22, the number of protrusions 41 is made greater than the number of lip-shaped protrusions 33 in the first embodiment, so that sound that enters the hollow seal portion 22 is more likely to hit the protrusions 41, thereby achieving the effect of reducing noise. [Example]

[0039] Next, a fourth embodiment of the present invention will be described with reference to Fig. 6. However, parts that are substantially the same as those in the first embodiment will be assigned the same reference numerals as those in the first embodiment, and descriptions thereof will be omitted or simplified, and mainly different parts will be assigned different reference numerals and described.

[0040] While the above-mentioned Examples 1 to 3 are all examples in which a weatherstrip 17 is attached to the periphery of the front door opening 14 and the rear door opening 15 of the vehicle body 11, the present Example 4 is an example in which a weatherstrip 51 is attached to the periphery of the front door 18 (rear door 19), which is an opening and closing member, so that when the front door 18 (rear door 19) is closed, the weatherstrip 51 seals between the periphery of the front door opening 14 (rear door opening 15) and the front door 18 (rear door 19).

[0041] The weatherstrip 51 has a long mounting portion 52 attached along the periphery of the front door 18 (rear door 19), and a cylindrical hollow seal portion 53 formed integrally with the interior side of the mounting portion 52. The mounting portion 52 and hollow seal portion 53 extend along the longitudinal direction of the weatherstrip 51 by extrusion molding.

[0042] The hollow sealing portion 53 abuts against the periphery of the front door opening 14 (rear door opening 15) of the vehicle body 11 and is compressed and deformed when the front door 18 (rear door 19) is closed, thereby sealing between the periphery of the front door 18 (rear door 19) and the periphery of the front door opening 14 (rear door opening 15).

[0043] The hollow seal portion 53 has a head side wall portion 54 located on the opposite side from the mounting portion 52, and bending portions 55 adjacent to both sides of this head side wall portion 54 and formed to be more easily bent than other portions of the hollow seal portion 53.

[0044] At one or more locations on the inner wall surface of the head side wall portion 54 of the hollow seal portion 53, lip-shaped protrusions 56 are integrally formed from the same material as the hollow seal portion 53, protruding from the inner wall surface into the hollow seal portion 53. The protrusions 56 are formed so that they will not be compressed when the hollow seal portion 53 is compressed and deformed when the front door 18 (rear door 19) is closed. 56 The protrusion 56 is formed so that its tip does not come into contact with the inner wall surface of the hollow seal portion 53. The protrusion 56 has a lip shape that extends along the longitudinal direction of the weatherstrip 51 by extrusion molding.

[0045] In the fourth embodiment, taking into consideration that the portion of the head side wall 54 of the hollow seal portion 53 through which sound is likely to enter is the portion that comes into contact with the side panel 13 when the front door 18 (rear door 19) is closed, a protrusion 56 is formed at the portion of the head side wall 54 of the hollow seal portion 53 that comes into contact with the side panel 13, thereby enhancing the effect of reducing sound entering the vehicle interior. However, a protrusion may be formed at another portion of the head side wall 54 of the hollow seal portion 53. Also, a protrusion may be formed at a portion of the hollow seal portion 53 other than the head side wall 54. [Example]

[0046] Next, a fifth embodiment of the present invention will be described with reference to Fig. 7. However, parts that are substantially the same as those in the first embodiment will be assigned the same reference numerals as those in the first embodiment, and descriptions thereof will be omitted or simplified, and mainly different parts will be assigned different reference numerals and described.

[0047] In this embodiment 5, a weatherstrip 62 is attached to a flange 64 provided along the periphery of a tailgate opening 61 of the vehicle body 11, and when the tailgate 63, which is an opening / closing member, is closed, the weatherstrip 62 seals between the periphery of the tailgate opening 61 and the periphery of the tailgate 63.

[0048] The weatherstrip 62 has a mounting portion 65 with a U-shaped cross section attached to a flange 64 provided along the periphery of the back door opening 61, and a cylindrical hollow seal portion 66 formed integrally with the mounting portion 65. The mounting portion 65 and hollow seal portion 66 extend along the longitudinal direction of the weatherstrip 62 by extrusion molding.

[0049] The mounting portion 65 is integrally formed with an exterior side wall portion 67, an interior side wall portion 68, and a top wall portion 69 connecting the both side wall portions 67, 68, and a cylindrical hollow seal portion 66 is integrally formed on the outer surface of the top wall portion 69. A core material 70 having a generally U-shaped cross section and made of a metal plate, a resin plate, or the like is embedded in the mounting portion 65 by composite extrusion molding, spanning the both side wall portions 67, 68. The weatherstrip 62 is attached to the flange 64 by clamping the flange 64 provided along the periphery of the opening of the back door opening 61 between retaining lips 71, 72 formed integrally on the inner surfaces of the both side wall portions 67, 68.

[0050] A decorative lip 73 that protrudes toward the interior of the vehicle is integrally formed on the interior side wall 68 of the mounting portion 65, and this decorative lip 73 covers and conceals the gap between the interior side wall 68 of the mounting portion 65 and the interior trim material 74 on the interior side of the vehicle. 60 The seal lips 75, 76 are integrally formed with the mounting portion 65 and protrude toward the vehicle exterior side wall portion 67 of the mounting portion 65 and the back door panel. 60 It is designed to seal between the

[0051] The hollow seal portion 66 has a head side wall portion 77 located on the opposite side from the mounting portion 65, and bending portions 78 adjacent to both sides of the head side wall portion 77 and formed to be more easily bent than other portions of the hollow seal portion 66.

[0052] A lip-shaped protrusion 79 that protrudes from the inner wall surface into the hollow seal portion 66 is integrally formed from the same material as the hollow seal portion 66 at one or more locations on the inner wall surface of the head side wall portion 77 of the hollow seal portion 66. The protrusion 79 is formed so that the tip of the protrusion 79 does not abut against the inner wall surface of the hollow seal portion 66 when the hollow seal portion 66 is compressed and deformed when the back door 63 is closed. The protrusion 79 has a lip shape that extends along the longitudinal direction of the weatherstrip 62 by extrusion molding.

[0053] In this fifth embodiment, taking into consideration that the portion of the head side wall portion 77 of the hollow seal portion 66 through which sound is likely to enter is the portion that comes into contact with the back door 63 when the back door 63 is closed, a protrusion 79 is formed on the inner wall surface of the portion of the head side wall portion 77 of the hollow seal portion 66 that comes into contact with the back door 63, thereby enhancing the effect of reducing sound entering the vehicle interior. However, a protrusion may be formed in another portion of the head side wall portion 77 of the hollow seal portion 66. Also, a protrusion may be formed in a portion of the hollow seal portion 66 other than the head side wall portion 77.

[0054] [Evaluation of the noise reduction effect of weatherstrips in Examples 1 to 3] A test was conducted to evaluate the noise reduction effect of the weatherstrips of Examples 1 to 3, and the results of the evaluation test are shown in Figure 8. In this evaluation test, a weatherstrip without a protrusion formed in the hollow seal portion was used as a benchmark, and a weatherstrip in which the space inside the hollow seal portion was divided by a protrusion was used as a comparative example. This comparative example corresponds to an example in which the tip of the protrusion protruding from the inner wall surface of the hollow seal portion abuts against the inner wall surface of the hollow seal portion. The weatherstrips of the benchmark, Examples 1 to 3, and Comparative Example have the same configuration except for the protrusion.

[0055] In this evaluation test, a weatherstrip sample was placed between a reverberation chamber and a semi-anechoic chamber, and noise was generated in the reverberation chamber and the transmitted sound (dB) was measured in the semi-anechoic chamber. At this time, noise was generated in the normal audible range (1000-4000kHz).

[0056] The weatherstrip mounting portion of the sample was fitted into a jig, and the transmitted sound was measured for each of the five weatherstrip patterns: benchmark, Examples 1 to 3, and Comparative Example. In addition, the transmitted sound was also measured for a pattern using only the jig, without fitting the weatherstrip.

[0057] The difference between the sound transmitted through the pattern with only the jig and the sound transmitted through the pattern with the weatherstrip fitted to the jig is taken as the insertion loss.

[0058] (Insertion loss) = (sound transmitted through jig only) - (sound transmitted through jig with weather strip attached) In the evaluation shown in FIG. 8, for the insertion loss of each of Examples 1 to 3 and the comparative example, when the insertion loss was 2 or more times greater than the benchmark, it was marked with "◎", when it was 1 to 2 times greater, it was marked with "◯", and when it was smaller than the benchmark, it was marked with "×".

[0059] The results of this evaluation test confirmed that Examples 1 and 2 had insertion losses that were 2 or more times greater than the benchmark, and that they had a higher noise reduction effect than the benchmark.

[0060] Furthermore, in Example 3, the insertion loss was 1 to 2 times larger than the benchmark, and it was confirmed that the effect of reducing noise was higher than the benchmark.

[0061] On the other hand, in the comparative example in which the space inside the hollow seal portion was divided by a protrusion, the insertion loss was smaller than that of the benchmark, and it was confirmed that no effect of reducing noise was obtained.

[0062] The results of the evaluation using noise in the general audible range (1000 to 4000 kHz) are shown in Figure 8. However, even for noise in the low frequency range (500 to 800 kHz) or high frequency range (5000 to 8000 kHz), by forming a protrusion in the hollow seal portion as in Examples 1 to 3, the insertion loss can be made larger than the benchmark.

[0063] [Other Examples] The present invention may be applied to a weather strip that seals between the periphery of the trunk opening of a vehicle body and the trunk lid, which is an opening and closing member for opening and closing the trunk lid, when the trunk lid is closed.

[0064] In addition, in Examples 1 to 5, the bending portion is formed to be more easily bent than the other portions of the hollow seal portion, but the bending portion is not limited to this and may be bent when the opening / closing member is closed.

[0065] In addition, the present invention is not limited to the above-described embodiments, and can be implemented with various modifications, such as changing the structure of the mounting portion of the weatherstrip, changing the shape of the hollow sealing portion, or changing the position or number of protrusions formed on the inner wall surface of the hollow sealing portion. [Explanation of symbols]

[0066] 11...vehicle body, 14...front door opening, 15...rear door opening, 16...flange, 17...weather strip, 18...front door (opening / closing member), 19...rear door (opening / closing member), 21...mounting portion, 22...hollow seal portion, 23...vehicle exterior side wall portion, 24...vehicle interior side wall portion, 25...top wall portion, 31...head side wall portion, 32...bent portion, 33, 33a, 41...protruding portion, 51...weather -strip, 52...mounting portion, 53...hollow seal portion, 54...head side wall portion, 55...bent portion, 56...protruding portion, 61...back door opening, 62...weatherstrip, 63...back door (opening / closing member), 64...flange, 65...mounting portion, 66...hollow seal portion, 67...vehicle exterior side wall portion, 68...vehicle interior side wall portion, 69...top wall portion, 77...head side wall portion, 78...bent portion, 79...protruding portion

Claims

1. A long weather strip that seals between a periphery of an opening in a vehicle body and an opening / closing member that opens and closes the opening when the opening / closing member is closed, The weatherstrip is attached to an attachment location of either the periphery of the opening of the vehicle body or the opening / closing member, and has a hollow seal portion that is abutted against the other of the periphery of the opening of the vehicle body or the opening / closing member when the opening / closing member is closed and is compressively deformable, and an attachment portion for attaching the hollow seal portion to the attachment location, the hollow seal portion has a head side wall portion located on the opposite side from the attachment portion, and bending portions adjacent to both sides of the head side wall portion and formed to bend when the opening / closing member is closed, a protruding portion protruding from at least the inner wall surface of the head side wall portion of the inner wall surface of the hollow seal portion excluding the bent portion is formed of the same material as the hollow seal portion, the protrusion has a height of 0.5 mm or more and is formed in a lip shape extending into the hollow seal portion, and the protrusion is formed at a plurality of locations on the inner wall surface of at least the head side wall portion at predetermined intervals, A weatherstrip characterized in that the tip of the protrusion is formed so as not to abut either the inner wall surface of the hollow seal portion or another protrusion, so that the space within the hollow seal portion is not blocked by the protrusion when the opening / closing member is closed and the hollow seal portion is compressed and deformed.

2. The weatherstrip according to claim 1, characterized in that the protrusions are formed on both the inner wall surface of the head side wall portion and the inner wall surface of other portions of the inner wall surface of the hollow seal portion, and are formed so that the protrusions do not abut against each other when the hollow seal portion is compressed and deformed when the opening / closing member is closed.

3. 3. The weatherstrip according to claim 1, wherein the bent portion is formed to be thinner than the remaining portion of the hollow seal portion.

4. 3. The weatherstrip according to claim 1, wherein the weatherstrip is a door opening attached to the periphery of an opening in the vehicle body.

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