JP7807350B2 - Weatherstrip - Google Patents

Description

The present invention relates to a long weatherstrip that seals the gap 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.

Generally, weatherstrips are attached to either the periphery of a vehicle body opening or an opening/closing member such as a door, and have a hollow seal portion that is compressively deformed by contacting the other of the periphery of the vehicle body 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 separate material within the hollow seal portion, with multiple corrugated projections and recesses formed on the inner circumferential surface of this cylindrical wall portion, in order to improve sound insulation. Furthermore, in the weatherstrip described in Patent Document 1, the cylindrical wall portion is made of a sponge material with a specific gravity lower than that of the molding material for the hollow seal portion, thereby preventing the compressive load on the hollow seal portion from becoming too large when the door is closed and preventing deterioration of door closing performance.

JP 2010-58637 A

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

The problem that this invention aims to solve is to provide a weatherstrip that reduces noise entering the vehicle interior without increasing the number of materials used to form the weatherstrip, and that prevents an increase in the compressive load on the hollow seal when the opening/closing member is closed, thereby preventing a deterioration in the closing ability of the opening/closing member.

In order to solve the above problem, the invention according to claim 1 provides a long weatherstrip 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 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 on the opposite side to the attachment portion, and bending portions adjacent to both sides of the head side wall portion that are formed to bend when the opening/closing member is closed. Within the hollow seal portion, a protrusion 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 from the same material as the hollow seal portion, and the protrusion has a height of 0.5 mm or more and is formed in a lip shape that extends into the hollow seal portion, and the protrusion is formed at a predetermined interval at multiple locations on at least the inner wall surface of the head side wall portion, and is formed so that the tip of the protrusion does not abut either the inner wall surface of the hollow seal portion or other protrusions so that the space within the hollow seal portion is not blocked by the protrusion when the hollow seal portion is compressed and deformed when the opening/closing member is closed.

In this configuration, a hollow cylindrical wall portion made of a different material is not disposed within the hollow seal portion, and the protrusion is formed on the inner wall surface of the hollow seal portion excluding the bent portion, and the protrusion does not protrude from the bent portion of the hollow seal portion, so an increase in compressive load on the hollow seal portion when the opening/closing member is closed is prevented, thereby preventing deterioration of the closing ability of the opening/closing member. Moreover, because the protrusion protruding from the inner wall surface of at least the head side wall portion within the hollow seal portion is made of the same material as the hollow seal portion, there is no need to increase the type of material 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.

Furthermore, the protrusion protrudes from at least the inner wall surface of the head side wall portion of the hollow seal portion so that sound that has entered the hollow seal portion from the head side wall portion thereof can easily strike the protrusion. Therefore, when sound that has entered the hollow seal portion when the opening-closing member is closed strikes the protrusion within the hollow seal portion, the energy of the sound that has entered the hollow seal portion is attenuated, thereby reducing the sound that enters the vehicle interior. Furthermore, the protrusion within the hollow seal portion is formed so that when the hollow seal portion is compressed and deformed when the opening-closing member is closed, the tip of the protrusion does not abut against either the inner wall surface of the hollow seal portion or other protrusions . This prevents the space within the hollow seal portion from being blocked by the protrusion, thereby preventing sound that has entered the hollow seal portion from being amplified by reflection and resonance in the narrow space blocked by the protrusion.

Furthermore , since the protrusion is formed in a lip shape that extends into the hollow seal portion, sound that enters the hollow seal portion is more likely to hit the protrusion, thereby enhancing the effect of reducing sound.

Furthermore , since the protrusions are formed at a predetermined interval at multiple locations on the inner wall surface of at least the head side wall portion, the probability that sound that enters the hollow seal portion will hit the protrusions is increased, thereby improving the effect of reducing noise.

In this case, as in claim 2 , 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 are formed 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, thereby enhancing the effect of reducing sound.

Furthermore, as in claim 3 , the bent portion may 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.

The weatherstrip of the present invention is preferably applied to a door opening attached to the periphery of an opening in a vehicle body, as in claim 4. This is because weatherstrips used in door openings have a large space within the hollow seal portion, making it easy to form a protrusion.

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. 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. 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. FIG. 4 is a view corresponding to FIG. 2 and showing a second embodiment of the present invention. FIG. 5 is a view corresponding to FIG. 2 and shows a third embodiment of the present invention. FIG. 6 is a cross-sectional view of a weather strip attached to a front door, showing a fourth embodiment of the present invention. 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. 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.

Below, we will explain several examples of how the present invention can be applied to door opening.

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 multiple panels, such as a roof panel 12 and side panels 13. A weatherstrip 17 (door opening), formed 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 vehicle 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.

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.

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 are extrusion-molded to extend along the longitudinal direction of the weatherstrip 17.

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, resin plate, or the like and having a generally U-shaped cross section is embedded in the mounting portion 21 by composite extrusion molding, spanning both side wall portions 23, 24.

A plurality of protrusions 27 that protrude 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 that protrudes diagonally downward toward the exterior side wall 23 is integrally formed on the inner surface of the interior side wall 24. When the weatherstrip 17 is to be attached, the flange 16 on the periphery of the front door opening 14 (rear door opening 15) is inserted into the gap between the side walls 23, 24 of the attachment portion 21 , causing the retaining lip 28 to abut against the flange 16 and elastically deform, and the flange 16 is sandwiched between the retaining lip 28 and the plurality of protrusions 27 of the exterior side wall 23 by the elastic repulsive force of the retaining lip 28, thereby attaching the weatherstrip 17 to the flange 16.

A decorative lip 29 that protrudes toward the interior of the vehicle is integrally formed on the top wall 25 of the mounting portion 21, and this decorative lip 29 covers and conceals the gap between the mounting portion 21 and the interior trim material 30 on the interior side of the vehicle.

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

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

A number of lip-shaped protrusions 33 are integrally formed at predetermined intervals on the inner wall surface of the head side wall 31 of the hollow seal portion 22 at multiple locations and made of the same material as the hollow seal portion 22. These lip-shaped protrusions 33 protrude into the hollow seal portion 22 from the inner wall surface of the head side wall 31. Each protrusion 33 is formed so that when the front door 18 (rear door 19) is closed and the hollow seal portion 22 is compressed and deformed, the tip of each protrusion 33 does not come into contact with the inner wall surface of the hollow seal portion 22. Furthermore, the protrusions 33 are positioned so that they do not come into contact with each other. Each protrusion 33 is formed by extrusion molding into a lip shape that extends along the longitudinal direction of the weatherstrip 17.

In this case, to ensure that sound entering the hollow seal portion 22 from outside the vehicle can 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 that prevents the tip of each protrusion 33 from abutting 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 is because the longer the protrusion length of each protrusion 33, the more easily sound entering the hollow seal portion 22 can hit each protrusion 33.

Furthermore, a covering portion 34 is formed on the surface of the hollow seal portion 22 to improve the wear resistance of that surface. This covering portion 34 is made of, for example, 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.

The hollow seal portion 22 and protrusion 33 are formed, for example, from a rubber material with a specific gravity of 0.2 to 1.0, while the mounting portion 21, retaining lip 28, and protrusion 27 are formed, for example, from a rubber material with a specific gravity of 0.6 to 1.5.

In the weatherstrip 17 of the first embodiment described above, the hollow seal portion 22 does not have a hollow cylindrical wall portion made of a different material. The bent portion 32 of the hollow seal portion 22 is formed to bend more easily than other portions, preventing an increase in compressive load on the hollow seal portion 22 when the front door 18 (rear door 19) is closed, thereby preventing deterioration of the closing ability of the front door 18 (rear door 19). Furthermore, the protrusion 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. This eliminates the need to increase the types of materials used to mold the weatherstrip 17 and the need for additional extrusion molding equipment when extruding the weatherstrip 17, thereby reducing production costs.

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 enters the hollow seal portion 22 from the head side wall 31 of the hollow seal portion 22 can easily strike it. Therefore, when sound enters the hollow seal portion 22 when the front door 18 (rear door 19) is closed, the sound strikes the protrusion 33 inside the hollow seal portion 22, attenuating the energy of the sound that has entered the hollow seal portion 22 and reducing the sound that enters the vehicle interior. Furthermore, the protrusion 33 inside the hollow seal portion 22 is formed so that its tip 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.

Furthermore, in this embodiment 1, the protrusion 33 is formed in a lip shape that extends into the hollow seal portion 22, making it easier for sound that enters the hollow seal portion 22 to hit the protrusion 33, thereby enhancing the sound reduction effect. Moreover, multiple protrusions 33 are formed at predetermined intervals on the inner wall surface of the hollow seal portion 22, increasing the probability that sound that enters the hollow seal portion 22 will hit the protrusion 33, thereby enhancing the sound reduction effect.

In addition, since the protruding portion 33 does not protrude from the bending portion 32, it is possible to prevent the bending portion 32 from becoming difficult to bend.

Next, a second embodiment of the present invention will be described using Figure 4. However, parts that are substantially the same as those in the first embodiment will be assigned the same reference numerals as in the first embodiment, and descriptions thereof will be omitted or simplified, while parts that are primarily different will be assigned different reference numerals and described.

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. However, 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 protrusion 33, 33a is formed by extrusion molding into a lip shape that extends along the longitudinal direction of the weatherstrip 17.

In addition, 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 outer 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.

In this case, the protrusion length and formation position of each protrusion 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 protrusion 33, 33a does not abut against the inner wall surface of the hollow seal portion 22 and the protrusions 33, 33a do not abut against each other.

In the weatherstrip 17 of the second embodiment described above, 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) efficiently attenuate the energy of sound that has entered the hollow seal portion 22, thereby enhancing the sound reduction effect.

Next, a third embodiment of the present invention will be described using Figure 5. However, parts that are substantially the same as those in the first embodiment will be assigned the same reference numerals as in the first embodiment, and descriptions thereof will be omitted or simplified, while parts that are primarily different will be assigned different reference numerals and described.

In the first embodiment, the protrusions 33 that protrude into the hollow seal portion 22 are formed in a lip shape. However, in the third embodiment, multiple protrusions 41 that protrude only a small amount into the hollow seal portion 22 are integrally formed at predetermined intervals from the same material as the hollow seal portion 22 on the inner wall surface of the head side wall portion 31 of the hollow seal portion 22. Each protrusion 41 is extrusion-molded 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 increased compared to 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.

Next, a fourth embodiment of the present invention will be described using Figure 6. However, parts that are substantially the same as those in the first embodiment will be assigned the same reference numerals as in the first embodiment, and descriptions thereof will be omitted or simplified, while parts that are primarily different will be assigned different reference numerals and described.

In the above-described first to third embodiments, weatherstrips 17 are attached to the periphery of the front door opening 14 and rear door opening 15 of the vehicle body 11. In the fourth embodiment, however, weatherstrips 51 are attached to the periphery of the front door 18 (rear door 19), which is an opening and closing member. When the front door 18 (rear door 19) is closed, the weatherstrips 51 seal between the periphery of the front door opening 14 (rear door opening 15) and the front door 18 (rear door 19).

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 integrally formed on 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.

When the front door 18 (rear door 19) is closed, the hollow seal 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, 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).

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, which are formed to bend more easily than other portions of the hollow seal portion 53.

A lip-shaped protrusion 56 protruding from the inner wall surface into the hollow seal portion 53 is integrally formed from the same material as the hollow seal portion 53 at one or more locations on the inner wall surface of the head side wall portion 54 of the hollow seal portion 53. The protrusion 56 is formed so that the tip of the protrusion 56 does not abut against the inner wall surface of the hollow seal portion 53 when the hollow seal portion 53 is compressed and deformed when the front door 18 (rear door 19) is closed. The protrusion 56 has a lip shape that extends along the longitudinal direction of the weatherstrip 51 by extrusion molding.

In this fourth embodiment, taking into consideration that the portion of the head side wall 54 of the hollow seal portion 53 through which sound is most 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 also be formed at another portion of the head side wall 54 of the hollow seal portion 53. A protrusion may also be formed at a portion of the hollow seal portion 53 other than the head side wall 54.

Next, a fifth embodiment of the present invention will be described using Figure 7. However, parts that are substantially the same as those in the first embodiment will be assigned the same reference numerals as in the first embodiment, and descriptions thereof will be omitted or simplified, while parts that are primarily different will be assigned different reference numerals and described.

In this fifth embodiment, 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 the gap between the periphery of the tailgate opening 61 and the periphery of the tailgate 63.

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 are extrusion-molded to extend along the longitudinal direction of the weatherstrip 62.

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 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 with a generally U-shaped cross section, made of a metal plate, resin plate, or the like, is embedded in the mounting portion 65 by composite extrusion molding, spanning the side wall portions 67, 68. Retaining lips 71, 72, integrally formed on the inner surfaces of the side wall portions 67, 68, clamp the flange 64 provided along the periphery of the opening of the back door opening 61, thereby attaching the weatherstrip 62 to the flange 64.

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 an interior trim material 74 on the interior side. Seal lips 75, 76 that protrude toward the back door panel 60 are integrally formed on the exterior side wall 67 of the mounting portion 65, and these seal lips 75, 76 seal between the exterior side wall 67 of the mounting portion 65 and the back door panel 60 .

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 this head side wall portion 77, which are formed to bend more easily than other portions of the hollow seal portion 66.

A lip-shaped protrusion 79 that protrudes into the hollow seal portion 66 from the inner wall surface of the head side wall portion 77 of 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. The protrusion 79 is formed so that its tip does not come into contact with 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 is extrusion-molded into a lip shape that extends along the longitudinal direction of the weatherstrip 62.

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 tailgate 63 when the tailgate 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 tailgate 63, thereby enhancing the effect of reducing sound entering the vehicle interior. However, a protrusion may also be formed in another portion of the head side wall portion 77 of the hollow seal portion 66. A protrusion may also be formed in a portion of the hollow seal portion 66 other than the head side wall portion 77.

[Evaluation of the noise reduction effect of weatherstrips of 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.

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, while the transmitted sound (dB) was measured in the semi-anechoic chamber. The noise was generated in the normal audible range (1000-4000kHz).

The weatherstrip mounting section of the sample was fitted into a jig, and the transmitted sound was measured for each of the five weatherstrip patterns: benchmark, Examples 1-3, and comparative example. Furthermore, transmitted sound was also measured for a pattern using only the jig, without the weatherstrip fitted.

The difference between the sound transmitted through the pattern with only the jig and the sound transmitted through the pattern with the weatherstrip fitted into the jig is the insertion loss.

(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 points higher than the benchmark, it was indicated by "◎", when it was 1 to 2 points higher, it was indicated by "◯", and when it was lower than the benchmark, it was indicated by "×".

The results of this evaluation test confirmed that Examples 1 and 2 had an insertion loss that was at least 2 times greater than the benchmark, and were more effective at reducing noise than the benchmark.

In addition, Example 3 had an insertion loss 1 to 2 times greater than the benchmark, confirming that it had a greater noise reduction effect than the benchmark.

On the other hand, in the comparative example, where the space inside the hollow seal portion was divided by a protrusion, the insertion loss was smaller than the benchmark, confirming that no noise reduction effect was achieved.

The results of the evaluation using noise in the general audible range (1000-4000 kHz) are shown in Figure 8. However, even for noise in the low frequency range (500-800 kHz) and high frequency range (5000-8000 kHz), by forming a protrusion inside the hollow seal as in Examples 1-3, it is possible to increase the insertion loss compared to the benchmark.

[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.

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

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 weatherstrip mounting portion, changing the shape of the hollow seal portion, or changing the position or number of protrusions formed on the inner wall surface of the hollow seal portion.

11...Vehicle body, 14...Front door opening, 15...Rear door opening, 16...Flange, 17...Weatherstrip, 18...Front door (opening/closing member), 19...Rear door (opening/closing member), 21...Mounting portion, 22...Hollow seal portion, 23...Exterior side wall portion, 24...Interior side wall portion, 25...Top wall portion, 31...Head side wall portion, 32...Bent portion, 33, 33a, 41...Protruding portion, 51...Weatherstrip, 52...Mounting portion, 53...Hollow seal portion, 54...Head side wall portion, 55...Bent portion, 56...Protruding portion, 61...Tailgate opening, 62...Weatherstrip, 63...Tailgate (opening/closing member), 64...Flange, 65...Mounting portion, 66...Hollow seal portion, 67...Exterior side wall portion, 68...Interior side wall portion, 69...Top wall portion, 77...Head side wall portion, 78...Bent portion, 79...Protruding portion

Claims (4)

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. The weatherstrip described in 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 hollow seal portion, and are formed 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. A weatherstrip as described in claim 1 or 2, characterized in that the bent portion is formed thinner than the rest of the hollow seal portion. 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.