JP2001301469A - Weather strip for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weather strip with excellent sound isolation capable of improving silence in a cabin of an automobile. SOLUTION: This weather strip is long and seals a gap between window glass, elevating from a slit-like opening between an inner panel and an outer panel, and the opening. The weather strip is composed of a basal body part mounted to a door inner panel or a door trim interior material, at least two seal lips extending from the basal body part toward the window glass, and noise absorbing material adhered to a surface of the basal body part between the seal lips.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an automobile door,
The present invention relates to a weatherstrip for sealing an opening (belt line) for an elevating window glass.

[0002]

2. Description of the Related Art As shown in FIG. 3, which is a cross-sectional view taken along line AA of FIG. 3, a belt line portion 12 of an automobile door 10 having an elevating window glass 11 shown in FIG. , And outer panels 31, 31 on the outside of the vehicle. Further on the inside of the inner panel, a door trim interior material 40 having a cushion material 40a with a cushion layer is mounted. Below the door, a space between the outer and inner panels is formed in a housing portion 14 in which a window glass driving device, an electric wiring to the driving device, and the like (both not shown) are stored. The window glass 11 moves up and down through a slit-shaped opening 13 extending between the outer panel and the inner panel, and the window is opened and closed. The opening / closing opening of the window glass is a slit-shaped opening in which the inner and outer panels are in contact with a gap slightly larger than the thickness of the window glass, and the gap between the window glass and the opening is the inner weather strip 20 and the outer weather strip. 21
Sealed by. Weather strip 20,
Reference numeral 21 denotes a long sealing material formed by extruding a soft resin such as rubber or an elastomer, and the window glass 11 is sandwiched between the inner weather strip 20 and the outer weather strip 21 to make the window glass rattle. This ensures smooth sliding and prevents water, dust, and the like from entering the door through the gap.

The sectional shape of the weather strips 20, 21 is generally the same as that of the base portions 20a, 21a mounted on the panel.
And a plurality of seal lips 20b and 21b extending in parallel to the base portion and obliquely inclined from the base portion toward the window glass. The seal lips 20b and 21b are made of an elastic material, and seal a gap with the window glass while following up and down (displacement) of the window glass. In order to enhance the sealing performance of the seal lip, the seal lip may be integrally formed with the base using a resin having a lower hardness than the base. Often, flocking 20c, 21c is applied to the surface of the seal lip to reduce sliding resistance with the window glass. The conventional weatherstrip is for sealing a gap so that moisture and dust do not enter, and no acoustic cutoff has been found.

As a result of a detailed investigation by the inventors, most of the road noise generated between the tires of the vehicle and the road surface is transmitted from below the vehicle door to the interior of the vehicle through a belt line (inner weather strip). It was revealed that it was invading. Road noise is generated mainly when a vehicle is running, when compressed air trapped between the road surface and the tread of the tire is released behind the tire and bursts. In general, since the door panel is located behind (above) the tires, the penetration ratio of road noise is large, and sound waves (road noise) entering from below the door panel propagate upward in the direction of the arrow in the figure and travel through the inner weather strip to the automobile. In the room. Most of the sound wave is cut off because the seal between the belt line and the window is sealed by the seal lip of the inner weather strip, but the sound wave with a frequency of 500 to 3150 Hz is considerably affected by the influence of resonance transmission and coincidence. Penetrates the weatherstrip and reaches the passenger compartment.

[0005]

SUMMARY OF THE INVENTION The present invention provides a weatherstrip for preventing road noise from entering a vehicle interior from a belt line.

[0006]

According to the present invention, there is provided a door portion of an automobile, which seals a gap between a window glass ascending and descending from a slit-shaped opening between an inner panel and an outer panel, and the opening. A long weather strip, comprising: a base portion attached to a door inner panel or a door trim interior material; at least two upper and lower seal lips extending from the base portion toward a window glass; An automotive weatherstrip made of a sound-absorbing material adhered to the surface of the base in between.

According to the present invention, a sound absorbing material suitable for sound absorption of road noise is attached between the seal lips of the weather strip to prevent the sound absorbing material from entering the vehicle interior. The sound wave (road noise) that enters from below the door panel travels through the space between the inner panel and the outer panel, reaches the belt line, is partially reflected by the seal lip below the weather strip, and the remaining components are sealed. Propagating upward through the lip. (The propagating sound wave mainly has a frequency component of 500 to 3150 Hz.) The remaining sound wave that has propagated is absorbed by the sound absorbing material between the upper seal lip and the propagating sound wave, and propagates through the upper seal lip into the vehicle interior. It is reduced as much as possible. In particular, when the sound absorbing material is a synthetic fiber mainly composed of ultrafine fibers having a diameter of less than 10 denier, the property of absorbing a sound wave of 500 Hz or more is excellent. The sound-absorbing material can be streamlined by sticking at the same time as the weatherstrip extrusion.
In the case where the sound absorbing material is attached to the surface of the seal lip, the vibration damping of the seal lip is improved, so that the sound insulation of the weather strip is increased. Further, the strength of the seal lip is increased, and the seal lip can be designed to be thinner than before.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below. (Weather Strip) A weather strip is formed by extruding a rubber material such as a thermoplastic elastomer resin or EPDM by heating and kneading with a screw extruder. A die having an opening formed along the cross-sectional shape of the weather strip is provided at the end of the extruder, and a resin in a plastic state is passed through the die opening to be continuously formed into a required cross-sectional shape. The weather strip has at least a flat base portion attached to an inner panel (door trim) of an automobile, and a plurality of sealing lips extending obliquely from the base portion toward the window glass. The obtained extruded product is cooled and (crosslinking treatment is performed in the case of rubber) and cut to a required length to obtain a weatherstrip. At the time of extrusion molding, an insert made of a steel plate may be included in the base portion as a reinforcing material. Further, the base portion and the seal lip may be integrally formed by co-extrusion of resins of different materials (different in hardness).

A sound absorbing material is attached between the upper and lower seal lips of the weather strip. The sound absorbing material is preferably made of a material having excellent sound absorbing properties for high frequency sound waves. Most preferred is a synthetic felt mainly composed of fibers having a fiber diameter of less than 10 denier. Synthetic felt thickness is 1-10mm, density is 0.02-0.9g / c
m ³ is preferable because of its excellent sound absorbing properties. Preferred as a sound-absorbing material other than synthetic felts are high-weight nonwoven fabric, urethane foam, glass wool, and a mixture thereof.
In the case of a water-absorbing material, it is appropriate to perform a water-repellent treatment. The sound absorbing material is preferably arranged continuously without a break along the longitudinal direction of the weather strip (seal lip). It is reasonable that the sound absorbing material is pressed and adhered while the raw material is in a plastic state during extrusion of the weatherstrip, but it can also be adhered using an adhesive after the formation of the weatherstrip.

FIGS. 1 (a) to 1 (d) show a preferred form of the sound absorbing material to be attached. Each is shown in the same sectional view of the belt line as FIG. The weatherstrip 100 of the embodiment of FIG.
Between the two seal lips 102, 103,
This is a form of sticking to the base. In this case, even if the seal lips 102 and 103 are deformed by the window glass M, the compression ratio of the sound absorbing material is small, and the density as originally designed can be maintained. The sound absorbing material is in a form that can be easily attached simultaneously with the extrusion molding of the weather strip.

(B) Weatherstrip 110
Is a mode in which a thin non-woven sound absorbing material 115 is attached to the lower surface of the upper seal lip 112 and the upper surface of the lower seal lip 113. In this case, the sound-absorbing material can be stuck in a wide area perpendicular to the traveling direction of the sound without any gap. It is possible to increase the sound absorption efficiency by arranging two or more arrangements in the sound traveling direction. (C) The weatherstrip 120 is a sound absorbing material 125 made of a resin foam.
Are arranged so as to fill the space between the upper and lower seal lips 122 and 123. In this case, since there is no gap between the seal lips through which the sound wave escapes, the sound absorbing efficiency can be improved. In addition, it structurally supports the deformation of the seal lip to prevent the seal lip from being set or deformed.

(D) Embodiment Weatherstrip 130
Is a form in which a hollow lip 134 surrounding the space is formed between the upper and lower seal lips 132 and 133, and the sound absorbing material 135 is disposed in this space. In this case, the sound absorbing material is hardly deteriorated, and the effect of the sound absorbing material can be maintained for a long time.
It is also suitable for a sound absorbing material that is weak against external force such as friction.

(Example) A weatherstrip according to the present invention having a sound absorbing material adhered thereto corresponding to FIG. 1A and a weatherstrip having the same shape without the sound absorbing material adhered as a comparative example were produced. The effect was measured and evaluated.

(Weather Strip) A soft vinyl chloride resin was extruded to form a weather strip. The cross-sectional shape is such that a flat base portion and two seal lips extend diagonally upward from the base portion toward the window glass (see FIG. 4). The tip of the seal lip is subjected to a nylon fiber flocking process.

(Sound absorbing material) Polyethylene terephthalate fibrous nonwoven fabric having a thickness of 5.0 mm, surface weight 600 g / m ²
Is a sound absorbing material. The fiber diameter in the non-woven fabric is 5 denier. Width 1
It was cut into a 0 mm narrow tape shape, and was adhered with an adhesive on the surface of the base portion between the two seal lips of the weather strip in parallel with the longitudinal direction of the weather strip.

(Evaluation Method) A weatherstrip to which a sound absorbing material is adhered is cut into a length of 400 mm to obtain a sound insulation evaluation sample (Example). In addition, a weatherstrip having the same cross-sectional shape and having no sound absorbing material attached thereto is cut into the same length to obtain an evaluation sample (comparative example). The sample is placed on the sound insulation test device to evaluate the sound insulation. The sound insulation evaluation device is composed of two anechoic boxes (a sound source box and a sound receiving box) separated by a partition wall and placed adjacent to each other, and a sound wave entering the opening in the center of the partition wall from below the car door as shown in Fig. 4 Install it according to the state of entering the car interior through the line (weather strip). White noise was output from a speaker set in the sound source box, and the sound insulation of the sample was calculated from the output difference between the microphones installed in the sound source box and the sound receiving box.

(Results) FIG. 4 shows the measurement results. In the figure, the horizontal axis is frequency and the vertical axis is calculated sound insulation (dB).
Is shown. The following is recognized from the difference between the example shown by the solid line and the comparative example shown by the dotted line. The sound insulation of the embodiment exceeds that of the comparative example over the entire frequency range. Especially frequency 63
At 0 to 2000 Hz, the difference is remarkable, and there is a difference of 6.0 (dB) at the maximum.

[0018]

According to the present invention, it is possible to reduce the ratio of road noise entering the vehicle interior through the belt line of the vehicle. It is also effective in isolating engine noise other than road noise and wind noise. There is an effect that the sealing lip of the weather strip is reinforced and durability against deformation is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of each embodiment of a weather strip for an automobile according to the present invention.

FIG. 2 is a side view of the automobile.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 shows a measurement method and a measurement result of a sound insulation degree.

[Explanation of symbols]

 10 Automotive Door 11 Window Glass 12 Belt Line 13 Opening 14 Housing 20 Inner Weather Strip 21 Outer Weather Strip 30 Inner Panel 31 Outer Panel 40 Door Trim 100, 110, 120, 130 Weather Strip 105, 115, 125, 135 Sound Absorbing Material

Claims (4)

[Claims] 1. A long weatherstrip for sealing a gap between a windowpane rising and descending from a slit-shaped opening between an inner panel and an outer panel and the opening in a door portion of an automobile, wherein the weatherstrip is A base part attached to a door inner panel or door trim interior material, at least two upper and lower seal lips extending from the base part toward the window glass, and a sound absorbing material adhered to the base surface between the seal lips. An automotive weatherstrip characterized by the following. 2. The weatherstrip for an automobile according to claim 1, wherein said sound absorbing material is a synthetic fiber felt mainly composed of ultrafine fibers having a diameter of less than 10 denier. 3. The automobile weather according to claim 1, wherein the weather strip is formed by extrusion molding, and the sound absorbing material is simultaneously bonded at the time of extrusion molding of the weather strip. strip. 4. A long weather strip that seals a gap between a window glass that rises and falls from a slit-shaped opening between an inner panel and an outer panel and the opening in a door portion of an automobile, wherein the weather strip is: A base portion attached to the door inner panel or the door trim interior material; at least two upper and lower seal lips extending from the base portion toward the window glass; and a sound absorbing material attached to a surface of the seal lip between the seal lips. A weatherstrip for an automobile.