Weather strip

Abstract

To obtain a weather strip which can reduce sound entering a passenger compartment without deteriorating assemblability to a vehicle body.SOLUTION: A weather strip 10 includes: an attachment base part 24 attached to a flange part 16 disposed at a peripheral edge part of a vehicle body door opening 14 provided at a vehicle body side part 12, the attachment base part 24 having a substantially U shaped cross section; a seal part 38 which is integrally provided with the passenger compartment outer side of a vehicle outer side wall part 28 in the attachment base part 24 and elastically deforms to seal a gap between the flange part 16 and a door body when a door is closed; a removal prevention lip part 42 which is provided at an end of a vehicle inner side wall part 30 in the attachment base part 24 and elastically holds the flange part 16 between itself and the vehicle outer side wall part 28; and a plurality of protruding parts 44 each of which is formed at a position, facing the vehicle outer side wall part 28 and located at the bottom wall part 26 side of the attachment base part 24 relative to the lip part 42, in the vehicle inner side wall part 30, protrudes to the flange part 16 side, and has a gap 46 provided between its tip part and the flange part 16.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a weatherstrip that seals between a vehicle door and a vehicle body. [Background technology]

[0002] Generally, a weatherstrip is provided between the vehicle door and the vehicle body to prevent rainwater and dust from entering, wind noise and door vibration.

[0003] As an example, Patent Document 1 below discloses an automotive weatherstrip (door opening weatherstrip). Briefly, in this prior art, a sealant member made of a sponge material is adhered to the bottom of a mounting base with a U-shaped cross section that is attached to a flange of a vehicle body opening. This structure prevents sound from entering from inside the mounting base. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-205846 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the automotive weatherstrips in the above-mentioned prior art have a sponge material bonded inside the weatherstrip for the purpose of reducing noise, and if the sponge part does not come into contact with the flange during assembly, sufficient noise reduction effect cannot be obtained, and assembly is also difficult.

[0006] SUMMARY OF THE INVENTION In consideration of the above, an object of the present invention is to provide a weatherstrip that can reduce noise entering the vehicle interior without impairing ease of assembly to the vehicle body. [Means for solving the problem]

[0007] The weatherstrip of the present invention described in claim 1 comprises a mounting base having a generally U-shaped cross section that is attached to a flange portion located on the periphery of a vehicle door opening provided on the side of the vehicle body; a sealing portion that is integrally provided on the outside of the vehicle compartment of the vehicle-exterior side wall portion of the mounting base and elastically deforms when the door is closed to seal between the flange portion and the door body; a lip portion that is provided on the end of the vehicle-interior side wall portion of the mounting base and elastically grips the flange portion between it and the vehicle-exterior side wall portion to prevent it from coming off; and a plurality of protrusions that are formed on the vehicle-interior side wall portion at a position facing the vehicle-exterior side wall portion and closer to the bottom wall portion of the mounting base than the lip portion, protruding toward the flange portion and having gaps between their tips and the flange portion.

[0008] According to the present invention, an expanded space is formed on the vehicle interior side wall by a plurality of protrusions that protrude into the space within the mounting base. Also, a gap is provided between the tip of each protrusion and the flange, forming a communication portion that connects the bottom wall of the mounting base to the lip.

[0009] When the vehicle is moving, wind pressure on the body can cause wind noise to pass through the interior of the body frame and reach the flange from the lower outside of the rocker. Furthermore, the wind noise tends to propagate toward the passenger compartment through the space formed by the mounting base and the flange.

[0010] At this time, part of the sound propagates into the extended space formed by the mounting base and the multiple protrusions provided inside the mounting base, or into the space formed between the multiple protrusions. The propagated sound is reflected by the vehicle-interior side wall of the mounting base or the protrusions, causing the sounds propagated into the extended space or space to cancel each other out, and also cancels out the sounds propagated into the communication part. This causes interference between the reflected sound and the sound propagating toward the interior of the vehicle, resulting in a noise reduction effect.

[0011] In this way, the above-mentioned sound-absorbing effect is achieved by forming a sound-absorbing space by dividing the internal spatial shape formed by the mounting base and flange portion with a protruding portion protruding from the side wall portion on the passenger compartment side, and arranging the space alongside the path leading to the passenger compartment.

[0012] Furthermore, the weatherstrip according to the present invention is easy to manufacture because it does not require inserting sound-insulating materials such as sealants or adhesives for adhering those materials inside the mounting base. Furthermore, because there are no materials inside the mounting base, there is no need to consider whether the mounting state between the internal resin and the flange is appropriate when assembling the weatherstrip to the flange. In other words, during the assembly process, it is only necessary to fit the mounting base of the weatherstrip into the flange, making assembly easy. [Effects of the Invention]

[0013] As described above, the weatherstrip according to the present invention as set forth in claim 1 has the excellent effect of reducing the sound entering the vehicle interior without impairing the ease of assembly to the vehicle body. [Brief explanation of the drawings]

[0014] [Figure 1] 1A is an enlarged vertical cross-sectional view of the weatherstrip and flange portion according to this embodiment, and FIG. 1B is an enlarged vertical cross-sectional view of the weatherstrip and flange portion according to a conventional example. [Figure 2] (A) is an enlarged longitudinal cross-sectional view of the essential parts, with the broken lines indicating the intrusion path of wind noise when the weatherstrip in this embodiment is in an assembled state, (B) is an enlarged longitudinal cross-sectional view of the essential parts corresponding to (A) showing the intrusion path of wind noise when the weatherstrip in the prior art is insufficiently pressed in when assembled, (C) is an enlarged longitudinal cross-sectional view of the essential parts corresponding to (A) showing the state when the weatherstrip in this embodiment is removed, and (D) is an enlarged longitudinal cross-sectional view of the essential parts corresponding to (B) showing the state when the weatherstrip in the prior art is removed. [Figure 3](A) is an enlarged vertical cross-sectional view of the weatherstrip and flange portion corresponding to Figure 1(A) showing the weatherstrip of the second embodiment, (B) is a conceptual diagram of an extended type sound-absorbing structure, (C) is an enlarged vertical cross-sectional view of the weatherstrip and flange portion corresponding to Figure 1(A) showing the weatherstrip of the third embodiment, (D) is a conceptual diagram of a resonator type sound-absorbing structure, (E) is an enlarged vertical cross-sectional view of the weatherstrip and flange portion corresponding to Figure 1(A) showing the weatherstrip of the fourth embodiment, and (F) is a conceptual diagram of a wedge type sound-absorbing structure. DETAILED DESCRIPTION OF THE INVENTION

[0015] (First embodiment) A weatherstrip 10 according to this embodiment will be described below with reference to Fig. 1. Note that the arrow UP shown in Fig. 1 indicates the upper side of the vehicle, and the arrow IN indicates the inside in the vehicle width direction.

[0016] (Overall structure of weatherstrip 10) As shown in Fig. 1(A), a door opening 14 for passengers to get in and out of the vehicle is formed in the vehicle body side 12 (although only partially shown). The door opening 14 is opened and closed by a side door 39. Note that Fig. 1 also shows a door trim 40 of the side door 39.

[0017] A flange portion 16 of a body frame member is arranged around the entire inner periphery of the above-mentioned door opening 14, and the weatherstrip (door opening weatherstrip) 10 of this embodiment is fitted to this flange portion 16.

[0018] More specifically, Fig. 1 shows the weatherstrip 10 fitted to a flange portion 16 of a rocker 17 located at the lower edge of a door opening 14 that is generally rectangular in a side view of the vehicle. As shown in this figure, the rocker 17 has a closed cross-sectional structure made up of a rocker inner panel 18 with a hat-shaped cross section that is located on the inside in the vehicle width direction, a rocker outer panel 20 with a hat-shaped cross section that is located on the outside in the vehicle width direction of the rocker inner panel 18, and a rocker reinforcement 22 that is sandwiched between the two. The upper flanges of these three components are spot-welded together to form the flange portion 16. An overview of the weatherstrip 10 fitted to this flange portion 16 will now be described.

[0019] The weatherstrip 10 is configured to include a mounting base 24 having an approximately U-shaped cross section that is fitted onto the flange portion 16, and a sealing portion 38 having an approximately annular cross section that is arranged adjacent to the mounting base 24 on the outer side in the vehicle width direction.

[0020] The mounting base 24 further includes a bottom wall 26 disposed opposite the tip of the flange 16, an exterior-side wall 28 disposed adjacent to the outer surface of the flange 16, and an interior-side wall 30 disposed opposite the inner surface of the flange 16. The flange 16 is inserted through an opening 32 in the mounting base 24 and fitted thereto. A metal core 34 having a substantially U-shaped cross section is inserted inside the mounting base 24. A plurality of seal lips 36 extending toward the flange 16 and elastically pressed against the flange 16 are formed on the side surface of the exterior-side wall 28 facing the flange 16.

[0021] The seal portion 38 is hollow and extends outward in the vehicle width direction from the exterior side wall portion 28. When the side door 39 is closed, it is pressed by the lower end of the door trim 40 and elastically deforms, thereby sealing the gap between the side door 39 and the door opening 14.

[0022] Furthermore, a lip portion 42 for preventing the weatherstrip 19 from coming off is integrally formed on the surface of the interior side wall portion 30 facing the flange portion 16. The lip portion 42 is located on the tip end side of the interior side wall portion 30 (the open end side of the mounting base 24) and extends in a tongue-like shape toward the flange portion 16. When the mounting base 24 is fitted to the flange portion 16, the tip end of the lip portion 42 is elastically pressed against the flange portion 16. This prevents the weatherstrip 19 from coming off the flange portion 16.

[0023] (Main structure of weatherstrip 10) Next, the structure of the main parts of the weatherstrip 10 will be described in detail.

[0024] A plurality of protrusions 44 are formed on the surface of the mounting base 24 facing the flange 16 of the interior side wall 30. The plurality of protrusions 44 are formed in multiple stages in a vertical cross section, and each protrusion 44 is formed with a solid rectangular cross section. The tip of each protrusion 44 is spaced from the flange 16, and a predetermined gap is formed between them. Hereinafter, this gap will be referred to as a "communication portion 46."

[0025] Furthermore, an expansion space 48 having a rectangular cross section is formed between the protrusion 44 located on the upper side (upper side of the vehicle) and the protrusion 44 located on the lower side (lower side of the vehicle) in Fig. 1. The expansion space 48 is mutually communicated with the communication portion 46.

[0026] (Actions and Effects of This Embodiment) The operation and effects of this embodiment will be described below.

[0027] In this embodiment, a plurality of protrusions 44 are formed on the interior side wall 30 of the mounting base 24, with their tips spaced apart from the flange 16. As a result, a communication section 46 is formed between the plurality of protrusions 44 and the flange 16, and an expanded space 48 is formed between the upper and lower protrusions 44, which is in communication with the communication section 46.

[0028] When the vehicle is running in this state, as shown in FIG. 1(B), wind pressure acting on the vehicle body can cause wind noise to reach the flange portion 16 through the space between the rocker outer panel 20 of the rocker 17 and the rocker reinforcement 22. This wind noise is indicated by arrow A. This wind noise A can pass through the interior of the body frame member and reach the flange portion 16 from the lower outside of the rocker 17. Furthermore, the arriving wind noise A attempts to propagate into the vehicle interior through the space formed by the mounting base 24 and the flange portion 16 and the small gap that occurs between the lip portion 42 and the flange portion 16, as with the conventional weatherstrip 100 shown in FIG. 1(B).

[0029] In this embodiment, the formation of the multiple protrusions 44 as described above forms an expanded space 48 within the mounting base 24. As shown in FIG. 2A, after the wind noise B passes around the flange 16, a portion of the wind noise B enters the expanded space 48. As the wind noise B propagates, it is repeatedly reflected, attenuating its own energy and canceling out the sound propagating to the communication portion 46. This causes the reflected sound to interfere with the sound propagating toward the vehicle cabin, thereby achieving the noise reduction effect based on the expansion silencer. The noise reduction effect is thus achieved by dividing the internal space formed by the mounting base 24 and the flange 16 by the protrusions 44 protruding from the interior sidewall 30, thereby forming the expanded space 48, and by arranging the expanded space 48 in parallel with the path (communication portion 46) leading to the vehicle cabin.

[0030] Incidentally, if the cross-sectional area of ​​the communication section 46 is S0, the cross-sectional area of ​​the expansion space section 48 is S, its length is L, the cross-sectional area ratio of the two is m, and the wave number is k, the sound volume reduction R is expressed by the following formula 1. Note that the wave number k is expressed as ω / c using the angular frequency ω and the sound traveling speed c.

[0031]

number

[0032] In addition, the following secondary effect can be obtained. Specifically, in the weatherstrip 100 according to the conventional technology shown in Fig. 2(B), a sealant 54 is applied to the bottom wall 26 of the mounting base 24. When the sealant 54 is applied to the bottom wall 26 of the mounting base 24 in this manner, the sealant 54 blocks the sound propagation path, thereby preventing sound from passing into the vehicle interior.

[0033] However, if the mounting base 24 is not pressed in sufficiently, the entire sealant 54 may not come into contact with the tip of the flange 16. In this case, the wind noise C may not be sufficiently attenuated, and there is a concern that the wind noise C may be transmitted into the vehicle interior.

[0034] In contrast, with the weatherstrip 10 according to this embodiment, as shown in FIG. 2(A), even if there is insufficient pressing, wind noise B enters the expanded space 48, and is therefore somewhat or almost entirely silenced.

[0035] Furthermore, the weatherstrip 10 according to this embodiment is easy to manufacture because there is no need to fill the interior of the mounting base 24 with a sealant or other sound-insulating material. Furthermore, because there are no components inside the mounting base 24, there is no need to consider whether the internal components are properly attached to the flange 16 when assembling the weatherstrip 10 to the flange 16. Another advantage is that the flange 16 is not soiled with sealant residue 58.

[0036] As described above, the weatherstrip 10 according to this embodiment can reduce the noise entering the vehicle interior without impairing the ease of assembly to the vehicle body.

[0037] (Supplementary explanation of the embodiment) Next, several modified examples will be described with reference to Figures 3(A) to 3(F). Note that the same components as those in the first embodiment described above are given the same reference numerals and the description thereof will be omitted.

[0038] The weatherstrip 50 according to the first modification shown in Fig. 3(A) is characterized in that three protrusions 44, instead of two, are formed in three upper and lower stages on the interior side wall 30, thereby forming an expanded space 48. The other configurations are the same as those of the above-described embodiment.

[0039] According to the above configuration, two expansion spaces 48 are formed between the three protrusions 44, but in terms of the noise absorbing structure, as shown in Figure 3(B), it is like two silencers are connected, which increases the effect. That is, wind noise D is first silenced by the expansion space 48 it encounters, and then further silenced as it enters the subsequent expansion space 48. Therefore, the noise absorbing effect is improved compared to the embodiment described above.

[0040] A weatherstrip 60 according to a second modified example shown in Fig. 3(C) is characterized in that, instead of the protrusions 44 of the previously described embodiment on the interior side wall portion 30, hook-shaped protrusions 62 are formed in two tiers, one above the other. The hook-shaped protrusions 44 of the two tiers are arranged opposite each other in the vertical direction of the vehicle. A gap 64 is formed between the tips of the hook-shaped protrusions 44 of the two tiers, and an expanded space 48 formed therebetween is mutually communicated with the communication portion 46 via this gap 64. The remaining configuration is the same as that of the previously described first embodiment.

[0041] According to the above configuration, the expansion space portion 48 has a substantially resonator shape. As shown in Fig. 3(D), when sound such as wind noise E propagates and attempts to invade the expansion space portion 48, the reaction force of the air inside the expansion space portion 48 causes the air in the neck portion of the resonator shape to vibrate, thereby attenuating the invading sound.

[0042] A weatherstrip 70 according to a third modified example shown in Fig. 3(E) is characterized in that a plurality of protrusions 72 each having a wedge-shaped cross section are arranged in parallel in three upper and lower rows on the interior side wall portion 30. The other configurations are the same as those of the first embodiment described above.

[0043] According to the above configuration, a wedge-shaped space 74 is formed between the protrusions 72. As shown in Fig. 3(F), sound propagated into the wedge-shaped space 74, such as wind noise F, is reflected toward the tip, and the acoustic energy is attenuated. This reflection in the space 74 causes sound attenuation. [Explanation of symbols]

[0044] 10, 50, 60, 70 Weatherstrip 24 Mounting base 38 Seal part 42 Lip 44, 62, 72 protrusion

Claims

[Claim 1] a mounting base having a generally U-shaped cross section that is attached to a flange portion disposed on a periphery of a vehicle door opening provided on a side portion of the vehicle body; a seal portion that is integrally provided on the outer side of the vehicle compartment of the outer side wall portion of the mounting base and that elastically deforms when the door is closed to seal between the flange portion and the door body; a retaining lip portion provided at an end of the vehicle-interior side wall portion of the mounting base, the retaining lip portion elastically gripping the flange portion between the vehicle-interior side wall portion and the mounting base; a plurality of protrusions formed on the interior side wall portion at positions facing the exterior side wall portion and closer to the bottom wall portion of the mounting base than the lip portion, the protrusions protruding toward the flange portion and having gaps between their tip ends and the flange portion; A weatherstrip having:

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