JP2003237379A - Automotive weather strip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a sound insulation property of a weather strip for providing a seal between a door opening edge of a vehicle body and the periphery of a door. <P>SOLUTION: The weather strip 3A comprises a mounting base portion 31 mounted on the periphery of a door 1 and a hollow seal portion 32 swollen from the mounting base portion 31 and pressed against a door opening edge 2 of a vehicle body when the door is closed, and has air vents formed in a seal wall 320 of sponge material of the hollow seal portion 32. An air vent forming region has a double wall structure of a closed section defined by an outer wall 320a and an inner wall 320b, and the outer wall 320a and the inner wall 320b have air vents 5a and 5b respectively. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip for sealing between an outer periphery of a door of a vehicle and a door opening edge of a vehicle body facing the door when the door of the automobile is closed, and more particularly to a sound insulation structure thereof. is there.

[0002]

2. Description of the Related Art As shown in FIGS. 7 and 8, a weather strip (door weather strip) 3 is attached to the outer periphery of an automobile door 1, and a weather strip (opening) is also provided on a door opening edge 2 of a vehicle body. Weather strip) 4 is attached and both weather strips 3 and 4 close the door 1 when the door is closed.
A seal is provided between the outer periphery of the door and the edge 2 of the door opening.

FIG. 8 shows a portion of the outer periphery of the door 1 along the door frame 10. As shown in the figure, the door weather strip 3 is entirely made of rubber or thermoplastic elastomer sponge material having closed cells. The door frame 10 is provided with a mounting base portion 31 attached to the retainer 11 provided on the outer peripheral surface side, a hollow seal portion 32, and a seal lip 33. The hollow seal portion 32 and the seal lip 3 are provided when the door is closed.
3 is pressed against the door opening edge 2.

On the other hand, the opening weather strip 4
Includes a mounting base portion 41 and a hollow seal portion 42, which are mounted on the flange 21 projecting from the inside of the door opening edge 2, and the mounting base portion 41 is made of a solid material of the same material as the door weather strip 3. The hollow seal portion 42 is made of the same sponge material as the door weather strip 3. In the opening weather strip 4, the hollow seal portion 42 is pressed by the outer periphery of the door including the door frame 10 when the door is closed.

The portion of the door weather strip 3 attached to the outer periphery of the main body of the door 1 is a seal lip 3
Although some of the components 3 are omitted, the basic structure is the same as the portion attached to the door frame 10. In FIG. 8, 7 is attached to the inner peripheral surface side of the door frame 10,
A glass run that seals between the door frame 10 and the door glass 8.

[0006]

By the way, the door weather strip 3 and the opening weather strip 4 are
In addition to preventing rainwater and car wash water from leaking into the passenger compartment,
Sound insulation is required to prevent outside noise from entering the passenger compartment. However, the hollow seal portions 3 of both weather strips
Each of the sealing walls 2 and 42 is made of a thin sponge material, and the air vents 5 and 6 that allow the air in the hollow to escape when the door 1 is closed and compressed are opened, so that the noise outside the vehicle is transmitted. Cheap.

Therefore, various measures are taken to improve the sound insulation. For example, (a) of the sealing wall of the hollow sealing portion of the door weather strip 3, the side surface portion on the passenger compartment side is made of a hard layer or high specific gravity sponge rubber (Japanese Patent Laid-Open No. 10-236163), (b) Door weather. A high-foam sponge material layer is provided on a portion of the hollow seal portion of the strip that is compressed by being sandwiched between the door and the door opening edge of the vehicle body when the door is closed (JP 2001-206166 A), (C) Door weather On the seal wall of the hollow seal portion of the strip, an open-cell sponge portion extending in a strip shape in the longitudinal direction is formed so that the open-cells act as air vent holes (actual opening 7-584).
Measures such as 5) are taken.

However, with the measures (a) and (b), the sound insulation of the seal wall itself is improved, but as in the conventional case, noise escapes to the passenger compartment side from the air vent hole. Further, in the measure of (c), the open cells of the sponge material are superior to the conventional air vent holes in sound insulation, but since the open cell forming portion extends over the entire length of the hollow seal portion, the air bubbles are formed at intervals. Compared to the door weather strip provided with a hole, improvement in sound insulation of the entire door weather strip cannot be expected to a great extent.

Therefore, the present invention provides a weatherstrip in which noise outside the vehicle is efficiently attenuated before entering the air vent hole of the hollow seal portion and in the process of passing through the air vent hole, thereby improving the sound insulation. This was done as an issue.

[0010]

SUMMARY OF THE INVENTION The present invention is a weather strip that is attached to the outer periphery of a door or the door opening edge of a vehicle body to seal between the outer periphery of the door and the door opening edge of the vehicle body. In a weather strip having a hollow seal part made of a sponge material of closed cells that is pressed against a mating member at the time of closing, and an air vent hole is formed in the seal wall of the hollow seal part, the air vent hole forming part of the seal wall is The outer wall and the inner wall have a double wall structure forming a closed cross section, and the air vent holes are formed in the outer wall and the inner wall, respectively. The noise that has penetrated the seal wall and entered the hollow seal portion passes through the air vent hole of the inner wall, enters the closed cross section between the inner wall and the outer wall, is reflected by the outer wall and the inner wall, is absorbed, and is attenuated. Through the air vent hole on the outer wall to the vehicle compartment side.

By forming the outer wall forming the closed cross section so that the inner surface of the inner wall is uneven, the noise entering the closed cross section is effectively diffused and attenuated (claim 2).

At least a part of the outer wall and the inner wall forming the closed cross section is formed by a sponge material having open cells, and the open cells serve as air vent holes (claim 3). Since the air vent hole is formed by the open cells of the sponge material, and the sponge wall of the open cells is a double wall, excellent sound insulation is exhibited.

According to the present invention, in the weather strip for sealing between the outer periphery of the door and the door opening edge of the vehicle body, the air vent hole forming portion of the seal wall is thicker than other portions of the seal wall. To form (claim 4). The path of the air vent hole through which the noise passes becomes longer, and the noise is attenuated in the process of passing through the air vent hole.

Still further, according to the present invention, in the weather strip for sealing between the outer periphery of the door and the door opening edge of the vehicle body, the inner wall of the seal wall of the hollow seal portion is opposed to the inner surface with the air vent hole interposed therebetween. Then, a projection is formed in which the facing side surface is an inclined surface with a facing distance narrowing toward the air vent hole (claim 5). Immediately before entering the air vent hole, the noise is reflected and attenuated by the opposite inclined side surfaces of both projections.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment in which the present invention is applied to a door weather strip attached to a door frame will be described.

FIG. 1 shows a first embodiment of the present invention. As shown in FIG. 1 (A), a door weather strip 3 is provided.
A is an integrally extruded body of EPDM sponge rubber, and includes a mounting base portion 31 and a hollow seal portion 32 that bulges from the mounting base portion 31.
And the mounting base 3 at a position outside the hollow seal portion 32 on the vehicle exterior side.
1B, the mounting base 31 is fitted to the retainer 11 provided on the door frame 10 to be attached to the door frame 10, and is hollow when the door is closed, as shown in FIG. 1B. The seal portion 32 has a seal wall 32.
The side surface portion of the vehicle body side of 0 is pressed against the door opening edge 2 of the vehicle body.

The inner surface of the seal wall 320 has a cross section of approximately L.
In the shape of a letter, one end is connected near the lower end of the side surface of the seal wall 320 pressed against the door opening edge 2, and the other end is attached to the mounting base 3.
Inner wall 320b connected to the seal wall 320 at a position closer to 1
Is formed. As a result, the seal wall 320 forms a double wall having a closed cross section by the outer wall 320a which is a general part of the seal wall 320 and the inner wall 320b which is substantially the same thickness or slightly thinner than the outer wall 320a.

In the inner wall 320b having a substantially L-shaped cross section, the air vent hole 5b is formed on one side 321 extending from the one end to the corner.
However, the air vent holes 5a are formed in the outer wall 320a at predetermined intervals in the longitudinal direction of the hollow seal portion 32. The air vent holes 5a and 5b are formed by means such as penetrating a hole drill from the outside of the hollow seal portion 32 to the outer walls 320a and 320b.

When the door is closed, the vehicle exterior noise that has penetrated the seal lip 33 and the seal wall 320 of the hollow seal portion 32 and entered the hollow seal portion 32 penetrates the inner wall 320b.
In addition, the inner wall 320b and the outer wall 320 pass through the air vent hole 5b.
Enter the closed cross section between a. The noise entering the closed cross section is partly absorbed by the outer wall 320a and the inner wall 320b, and partly reflected by the inner surfaces of the outer wall 320a and the inner wall 320b to be attenuated.
It is attenuated in the process of passing through a. By thus forming the air vent hole forming portion with the double wall structure, the noise that enters from the hollow seal portion 32 to the passenger compartment side is effectively attenuated.

Further, in this embodiment, the inner wall 320b is formed in an L-shaped cross section, and the air vent hole 5b is formed on one side 321 thereof, so that the noise damping effect is more effectively exhibited. That is, when the door is closed and the hollow seal portion 32 is pressed against the door opening edge 2 of the vehicle body and compressed in the width direction as shown in FIG. 1 (B), the inner wall 320b is folded at its corner and the one side is closed. Side 321 and the other side 322 approach each other in the facing direction. Therefore, noise that enters the double wall from the air vent hole 5b on one side 321 is immediately reflected on the other side 322, so that the damping effect is remarkably exhibited.

FIG. 2 shows a second embodiment of the present invention. The door weather strip 3B has the above-mentioned first basic structure as a whole.
Substantially the same as the embodiment of FIG.

In this embodiment, the air vent hole forming portion is the outer wall 3 which is a general portion of the seal wall 320 of the hollow seal portion 32.
20c and the inner wall 320d have a closed wall double wall structure, and the outer wall 320c has an air vent hole 5c.
An air vent hole 5d is formed in d. And the outer wall 32
0c and the inner surface of the inner wall 320d are formed to have an uneven cross section. The convex portion and the concave portion extend in the longitudinal direction of the hollow seal portion 32 and are simultaneously formed during the weather strip extrusion molding.

Noise entering the double wall through the air bleed hole 5d is diffusely reflected by the inner surfaces of the outer wall 320c and the inner wall 320d which are uneven, and the damping effect is efficiently exhibited.

FIG. 3 shows a third embodiment of the present invention. The present embodiment is different from the second embodiment in the structure of the air vent hole. The air vent hole forming portion of the hollow seal portion 32 of the door weather strip 3C has an outer wall 320e and an inner wall 320.
It is a double wall structure with a closed cross section at f and. The outer wall 320e is formed of a continuous-cell sponge material at the center thereof,
The inner wall 320f is formed almost entirely of a sponge material having open cells. In this way, the door weather strip 3C in which a part or all of the double wall is formed of the open-cell sponge material and the other part is formed of the closed-cell sponge material is manufactured by integral extrusion molding.

In the present embodiment, the continuous bubbles are made to act as air vent holes, and the noise that has entered the hollow seal portion 32 passes through the continuous bubbles of the inner wall 320f and enters the double wall,
It passes through the continuous bubbles on the outer wall 320e and exits to the passenger compartment side. Since the open air bubbles are thinner and meander than those of a normal air vent hole, noise is absorbed and attenuated in the process of passing through the open air bubbles.

The above-mentioned Japanese Patent Laid-Open No. 2001-206166
In the structure in which a continuous foam sponge rubber part is formed over the entire length as in the above, the sound insulation effect is not necessarily superior to the conventional structure in which air vents are provided at intervals in the seal wall. However, in this embodiment, the outer wall 320 has a double wall structure in which the inner wall 320f and the outer wall 320e of the open-cell sponge material form a closed cross section.
The noise emitted to the inside of the vehicle through the continuous air bubbles of e is remarkably attenuated as compared with the conventional seal wall structure having the air vent hole.

FIG. 4 shows a fourth embodiment of the present invention. Only the structure of the air vent hole forming portion is different from the previous embodiments. In this embodiment, the air vent hole forming portion of the seal wall 320 of the hollow seal portion 32 of the door weather strip 3D is
It is thicker than the general portion of the seal wall 320 and is formed to have a thickness of about twice. Then, in the thickened air vent hole forming portion, the air vent hole 5e penetrating therethrough is formed in the hollow seal portion 3
2 Formed at a predetermined interval in the longitudinal direction.

The thicker the sealing wall of the air vent hole forming portion lengthens the noise passage, and the noise is absorbed and attenuated by the peripheral surface of the air vent hole 5e during the passage process.

FIG. 5 shows a fifth embodiment of the present invention. This embodiment also differs from the previous embodiments only in the structure of the air vent hole forming portion. Hollow seal part 3 of weather strip 3E
The inner surface of the second seal wall 320 has protrusions 34 facing each other.
a. 34b is formed in series in the longitudinal direction of the hollow seal portion 32. An air vent hole 5f is formed between the protrusions 34a and 34b at a predetermined interval in the longitudinal direction of the hollow seal portion 32.

The protrusions 34a and 34b have a tapered trapezoidal cross section, and the opposite inclined side surfaces 341a and 341b form grooves whose width becomes narrower toward the air vent hole 5f.

The noise that has entered the hollow seal portion 32 is opposed to the protrusions 34a, 34 before entering the air vent holes 5f.
The noise that is diffusely reflected by the inclined side surfaces 341a and 341b of b and is damped in the process of further passing through the air vent hole 5f is remarkably reduced. .

The noise outside the vehicle can be seen from the seal structure around the door shown in FIG.
Then, after passing through the opening weather strip 4, enter the passenger compartment. Therefore, as a sound insulation measure, it is more effective to apply this to the door weather strip 3 than to the opening weather strip 4. However, sound insulation can be more completely achieved by providing sound insulation measures for the opening weather strip 4 as well as the door weather strip 3.

The sound insulation structure of the opening weather strip 4 may be the same as the sound insulation structure of the door weather strip 3.

FIG. 6 shows an example thereof. The opening weather strip 4A has a mounting base portion 41 attached to a flange 21 formed on the door opening edge 2 of the vehicle body, and a hollow seal bulging from the side surface of the mounting base portion 41. The sealing wall 420 of the portion 42 is pressed against the inner end of the outer periphery of the door 1 (the door frame 10 in the illustrated example) when the door is closed.

The sound insulation structure of the opening weather strip 4A is basically the same as the sound insulation structure of the door weather strip 3A shown in FIG. 1, and the seal wall 420 and the inner end portion of the door frame 10 which presses the same. The portion between the inner end portion and the edge surface of the door opening edge 2 of the vehicle body that faces the seal wall 420 is
The outer wall 420a and the inner wall 420b, which are general parts, have a double-wall structure in which a closed cross section is formed. And the outer wall 42
0a and the inner wall 420b, respectively, the air vent holes 6a, 6
b is formed, and the same sound insulation effect as in the door weather strip 3A is exhibited.

[0036]

According to the sound insulation structure of the weather strip of the present invention, the air vent hole forming portion of the seal wall of the hollow sealing portion of the weather strip has a double wall structure, and the double wall has a continuous cell sponge material. , Or by making the air vent hole formation part thick to lengthen the noise passage of the air vent hole, or by providing a protrusion on the inner surface of the seal wall to reflect the noise that escapes to the air vent hole, The noise emitted to the passenger compartment can be attenuated and the quietness of the passenger compartment can be enhanced.

The present invention can be applied to a weather strip which is attached to the entire outer circumference of the door and the entire circumference of the door opening edge of the vehicle body. It is especially effective when applied to weather strips that are attached to parts along the door frame close to the.

[Brief description of drawings]

FIG. 1 is a first example in which the present invention is applied to a door weather strip.
7A is a cross-sectional view of the door weather strip at a position along the line AA in FIG. 7, and FIG. 9B is a cross-sectional view of the door weather strip being attached at the same position. is there.

FIG. 2 is a sectional view of the second embodiment of the door weather strip of the present invention at the same position as the above.

FIG. 3 is a cross-sectional view of a third embodiment of the door weather strip of the present invention at the same position as above.

FIG. 4 is a cross-sectional view of the fourth embodiment of the door weather strip of the present invention at the same position as the above.

FIG. 5 is a cross-sectional view of a fifth embodiment of the door weather strip of the present invention at the same position as above.

FIG. 6 is a sectional view of an opening weatherstrip attached state at the same position as that of the embodiment in which the present invention is applied to the opening weatherstrip.

FIG. 7 is a side view of an automobile to which the weather strip of the present invention is applied.

FIG. 8 is a sectional view of a conventional door weather strip in a mounted state at a position along the line AA in FIG. 7.

[Explanation of symbols]

1 Door 10 Door frame 2, Door opening edge 3, 3A. 3B, 3C, 3D, 3E Weather strip (door weather strip) 32 Hollow seal part 320 Seal walls 320a, 320c, 320e Outer walls 320b, 320d, 320f Inner walls 34a, 34b Protrusions 5, 5a, 5b, 5c, 5d, 4e , 5f Air vent hole 4, 4A Weather strip (opening weather strip) 42 Hollow seal portion 420 Seal wall 420a Outer wall 420b Inner wall 6, 6a, 6b Air vent hole

Claims (5)

[Claims] 1. A weather strip that is attached to the outer periphery of a door or to a door opening edge of a vehicle body to seal between the outer periphery of the door and the door opening edge of the vehicle body, and is independently pressed against a mating member when the door is closed. In a weather strip having a hollow seal part made of a foamed sponge material and having an air vent hole formed in the seal wall of the hollow seal part, the air vent hole forming part of the seal wall has a closed cross section with an outer wall and an inner wall. A weather strip for an automobile, which has a double-wall structure to be formed, and air vent holes are formed in the outer wall and the inner wall, respectively. 2. The weather strip for an automobile according to claim 1, wherein inner surfaces of the outer wall and the inner wall forming a closed cross section are formed in an uneven shape. 3. The weather strip for an automobile according to claim 1, wherein at least a part of the outer wall and the inner wall forming a closed cross section is formed of a sponge material having open cells, and the open cells are air vent holes. 4. A weather strip that is attached to an outer periphery of a door or a door opening edge of a vehicle body and seals between the outer periphery of the door and a door opening edge of the vehicle body. The weather strip is pressed against a counterpart member when the door is closed. In a weather strip having a hollow seal part made of a foamed sponge material and having an air vent hole formed in the seal wall of the hollow seal part, the air vent hole forming part of the seal wall is formed more than other parts of the seal wall. A weather strip for automobiles characterized by being thick. 5. A weather strip, which is attached to the outer periphery of a door or a door opening edge of a vehicle body and seals between the outer periphery of the door and the door opening edge of the vehicle body, the weather strip being pressed against a mating member when the door is closed. In a weather strip having a hollow seal part made of a foamed sponge material and having an air vent hole formed in the seal wall of the hollow seal part, the air vent hole is sandwiched on the inner surface of the seal wall of the hollow seal part. A weather strip for an automobile, characterized in that projections are formed such that opposed side surfaces are inclined surfaces with a facing distance narrowing toward the air vent hole.