JP2001130344A - Weather strip and its manufacturing and assembling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weather strip that utilizes shape memory rubber molding instead of a metal, can follow a bending of it during its mounting on a car body corner part of an automobile, and has high holding force of a flange, and to provide its manufacturing method and assembling method. SOLUTION: The weather strip comprises a mounting base 22 that has substantially U-shaped cross section, and is inserted into a flange formed at a car body opening edge of the automobile from an opening 22a side, a hollow seal portion 23 integrally formed on the mounting base 22, lip portions 27, 28 that are formed inside one sidewall 24 of the mounting base 22 and holds the flange, and a double coated tape 29 that is adhered to the inside of the other sidewall 25 of the mounting base 22 and holes the flange with the lip portions 27, 28. At least the mounting base 22 is made of the shape memory rubber molding formed by dispersing and mixing granular resin material into valcanizable rubber, and can be restored to the shape with the U-shaped cross section by seating treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip to be inserted into a flange formed along an opening edge of a vehicle body, for example, a door opening edge or a trunk room opening edge, and a method of manufacturing and assembling the weather strip.

[0002]

2. Description of the Related Art A weather strip extending in a longitudinal direction as shown in FIG. 5 is provided on a flange (not shown) formed along a door opening edge, a trunk room opening edge, a door peripheral edge, or the like of an automobile body. One mounting base 2 is attached. The mounting base 2 is integrally formed with a hollow seal part 3 which also extends in the longitudinal direction.

The mounting base 2 has a substantially U-shaped cross section, and is inserted into the front end of the flange from the substantially U-shaped opening 2a side. Side walls 4 and 5 forming substantially U-shape
Are formed with claw-shaped lip portions 7 to 10 for holding the flange when the flange is inserted. A metal core 11 made of a substantially U-shaped iron wire, a ladder-like stamped iron plate, or the like is embedded in the mounting base 2 along the side walls 4 and 5 to improve the rigidity of the mounting base 2. The punching in a ladder shape
This is because, together with the pinching force in the cross section, it is possible to easily follow the bending when the vehicle is mounted on a vehicle body corner (not shown). Further, a tongue-shaped seal lip portion 12 is formed integrally with the mounting base portion 2.

[0004]

The core metal 11 embedded in the mounting base 2 may be made of a material such as aluminum in order to reduce the weight. There is a problem that it occupies about half of the weight and becomes heavy. On the other hand, if the holding portion is made of a material having higher rigidity by eliminating the metal core 11, the mounting base 2 extruded as shown in FIG. In the case of bending when mounting, it is impossible to follow the bent portion, which is impractical.

[0005] On the other hand, there is known a shape memory rubber molded article in which a granular resin material is dispersed and compounded in a vulcanizable rubber and returns to its original shape even if it is temporarily deformed when a product is used ( JP-A-9-309986). Examples of the resin material include a crystalline resin such as a homopolymer or copolymer of an α-olefin having 2 to 12 carbon atoms, polystyrene, an ABS resin which is a copolymer of acrylonitrile, butadiene and styrene, and acrylonitrile and EPDM. Amorphous resins such as AES resin, which is a copolymer of styrene and styrene, acrylonitrile, styrene, and AAS resin, which is a terpolymerized resin containing special rubber as a main raw material. Examples of the vulcanizable rubber include an ethylene / α-olefin / non-conjugated polyene copolymer rubber obtained by randomly copolymerizing ethylene, an α-olefin having 3 to 20 carbon atoms, and a non-conjugated polyene. can give.

Japanese Patent Application Laid-Open No. Hei 9-309986 discloses that a shape-memory rubber molded article can be widely used for automobile parts such as a weather strip sponge. Is not shown.

Accordingly, an object of the present invention is to eliminate the use of the core metal by using the above-mentioned shape-memory rubber molded article, and to be able to follow the bending at the time of attachment to a vehicle body corner (not shown), and to allow the flange to be used. An object of the present invention is to provide a weather strip having a high holding force and to provide a manufacturing method and an assembling method thereof.

[0008]

In order to achieve the above object, a weather strip (20) according to a first aspect of the present invention has a substantially U-shaped cross section, and has a vehicle body from an opening (22a) side. A mounting base (22) inserted into a flange formed on the opening edge, a hollow seal (23) integrally formed with the mounting base (22), and one of the side walls (24) of the mounting base (22) inside. The lip portions (27, 28) formed and holding the flange and the inside of the other side wall (25) of the mounting base portion (22) are adhered to the lip portion (2).
Double-sided tape (2) holding flange together with (7, 28)
9), wherein at least the mounting base (2
2) is characterized by comprising a shape-memory rubber molded product obtained by dispersing and blending a granular resin material into a vulcanizable rubber, and by a heat treatment, it can be restored to a substantially U-shaped cross section.

According to a second aspect of the present invention, there is provided a method for manufacturing a weatherstrip, comprising a substantially U-shaped cross section and an opening (22).
a) A mounting base (22) inserted into a flange formed at an opening edge of a vehicle body of an automobile, a hollow seal part (23) integrally formed with the mounting base (22), and a mounting base (2).
2) a lip portion (27, 28) formed inside one side wall (24) for holding a flange; and a lip portion attached to the inside of the other side wall (25) of the mounting base (22). A method for manufacturing a weather strip including a double-sided tape (29) holding a flange together with (27, 28), wherein at least the mounting base (22) is obtained by dispersing and compounding a granular resin material into a vulcanizable rubber. A mounting base (2) formed of a shape-memory rubber molded body and having a hollow seal portion (23) and lip portions (27, 28) integrally formed.
(2) an extrusion step of extruding into a vulcanizing furnace with a substantially U-shaped cross section, a sizing step of further expanding the opening (22a) of the mounting base (22) than the substantially U-shaped cross section, and an opening ( 22a) attaching a double-sided tape (29) to the inside of the other side wall (25) of the expanded mounting base (22).

According to a third aspect of the present invention, in the method for manufacturing a weather strip, after the sticking step according to the second aspect, a heat treatment is performed at a predetermined temperature at which the resin of the shape-memory rubber molded article softens. Opening (22a) of mounting base (22)
And a cooling step of returning the shape to a substantially U-shaped cross section and a cooling step.

According to a fourth aspect of the present invention, there is provided a method for assembling a weatherstrip according to the second aspect, wherein the mounting base (22) of the weatherstrip (20) manufactured is flanged. After the tape is fixed to the opening, a heat treatment is performed at a predetermined temperature at which the resin of the shape memory rubber molded article softens, and the opening (22) of the mounting base (22) is opened.
a) is returned to a substantially U-shaped cross-section and assembled to a flange.

Here, the flange formed at the door opening edge of the vehicle body of an automobile means a flange formed along a door opening edge, a trunk room opening edge, or a door peripheral edge.

The symbols in the parentheses correspond to the symbols described in the drawings and the embodiments of the invention described later.

According to the first aspect of the invention, the mounting base of the weather strip is formed into a substantially U-shaped cross-section by a shape-memory rubber molded article obtained by dispersing and blending a granular resin material into a vulcanizable rubber. Even if it is deformed, it can be restored to a substantially U-shaped cross section by heat treatment, so that sufficient holding force can be obtained for the flange to be inserted without particularly embedding the core metal in the mounting base as shown in the past. In addition, it is possible to follow the bending of the mounting base at the time of mounting to the vehicle body corner.

According to the second aspect of the present invention, when manufacturing a weather strip, the mounting base is formed of a shape-memory rubber molded product obtained by dispersing and blending a granular resin material into a vulcanizable rubber. And memorize the state of the substantially U-shaped section,
As a sizing process in which the opening of the mounting base is further expanded than the substantially U-shaped cross section as a pre-process of attaching the double-sided tape to the inner side wall, the double-sided tape can be easily attached. After that, as in the invention according to claim 3, when the heat treatment is performed at a predetermined temperature at which the resin of the shape memory rubber molded article softens, the opening of the mounting base can be returned to the original substantially U-shaped cross section, It can be assembled to the vehicle body flange in this U-shaped cross section.

Further, as described in claim 4, claim 2
After fixing the mounting base of the weatherstrip manufactured by the method for manufacturing a weatherstrip to the flange with a tape, the opening of the mounting base is heated by a predetermined temperature at which the resin of the shape-memory rubber molded article softens. When the section is returned to a substantially U-shape, there is no need to apply a strong force to assemble the flange.

[0017]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram schematically showing a weather strip manufacturing apparatus according to an embodiment of the present invention, and FIGS. 2 to 4 are cross-sectional views showing the manufactured weather strip.

As shown in FIG. 2, the weatherstrip 20 according to the embodiment of the present invention includes a mounting base 22, a hollow seal portion 23 integrally formed with the mounting base 22, and one side wall 24 of the mounting base 22. It is composed of claw-shaped lip portions 27 and 28 formed on the inside, and a double-sided tape 29 adhered to the inside of the other side wall 25. Also, the side wall 25 of the mounting base 22
On the outside, a tongue-shaped seal lip portion 30 is integrally formed.

The mounting base 22 has a substantially U-shaped cross section and is inserted into a flange (not shown) formed at the opening edge of the vehicle body of the automobile from the opening 22a side. A predetermined temperature (usually 110 to 160 ° C., which is a temperature at which the resin of the shape memory rubber molded body softens) even if the mounting base 22 is deformed. By performing the heat treatment, the cross section is restored to a substantially U-shaped section. Accordingly, a sufficient holding force can be obtained without particularly embedding the core metal in the mounting base 22, and it is possible to follow the bending of the mounting base 22 when the mounting base 22 is mounted on a vehicle body corner (not shown).

As the resin material, the above-mentioned Japanese Patent Application Laid-Open No. 9-3
A crystalline resin or an amorphous resin described in JP-A-099886 is used, and as a vulcanizable rubber, an ethylene / α-olefin / non-conjugated polyene copolymer rubber is used.

The hollow seal portion 23 is made of sponge rubber,
Together with a seal lip portion 30 made of sponge rubber, the gap between the opening edge of the vehicle body and the door is sealed. The lip portions 27 and 28 are made of low-hardness solid rubber and hold the double-sided tape 29 and the flange inserted therebetween.
As the double-sided tape 29, a type using a primer for attaching a painted sheet metal of a vehicle body is used. Note that a heat-sealing type adhesive tape may be used.

The weather strip 20 constructed as described above is manufactured by the following steps. a. Extrusion Step As shown in FIG. 1, the vulcanizing furnace 1 is provided from the extruder 101 in a state where the cross section of the mounting base 22 is substantially U-shaped as shown in FIG. 2.
Extrude into 02. At this time, the shape memory rubber molded body as described above is used as the extruded material for the mounting base 22, the sponge rubber material is used for the hollow seal part 23 and the seal lip part 30, and the lip parts 27 and 28 are used. Is made of solid rubber. At this stage, the double-sided tape 29 has not been attached to the mounting base 22.

B. Sizing Step In the subsequent sizing step, the extruded weather strip 20 is passed through a sizing die 103 to be attached to the mounting base 2.
The second opening 22a is further expanded than the substantially U-shaped cross section.
That is, as shown in FIG. 3, the opening 22a is widened by about 45 degrees in the left and right directions. The reason why the opening 22a is widened is to make it easy to attach the double-sided tape 29 in the next step. c. Adhering Step Next, the double-sided tape 29 is adhered to the inside of the other side wall 25 of the mounting base 22 in which the opening 22a is widened using the tape stretching machine 104.

D. Shape Restoring Step Next, the weather strip 20 having the shape shown in FIG. 3 is guided to the heating furnace 105, and is heated at a predetermined temperature (110 to 160 ° C.) at which the resin of the shape-memory rubber molded product softens. Thereby, the shape of the opening 22a of the mounting base 22 is returned to a substantially U-shaped cross section as shown in FIG. The sizing process may be provided again after the shape restoring process to increase the clamping force of the mounting base 22. e. Cooling Step Then, the weatherstrip 20 whose shape has been restored is guided to the cooling tank 106 and cooled to stabilize the shape.

Next, a method of assembling the weather strip 20 will be described. As described above, the opening 22a of the weather strip 20 (the state shown in FIG. 4) after the cooling step is described.
Is inserted into a flange formed at the opening edge of the vehicle body of the automobile, and then the liner 29a of the double-sided tape 29 is peeled off. Thereby, the double-sided tape 29 is pressed against the flange by the pinching force of the mounting base 22, and the assembly is completed.

In the embodiment of the present invention, the mounting base 22 is mounted on the flange in a state where the cross section of the mounting base 22 is substantially U-shaped. However, after the step (c) of applying the double-sided tape 29, the opening 22a is expanded. After cooling in a heated state (the state shown in FIG. 3) and fixing it to a flange with a tape, heat treatment is performed at a predetermined temperature (110 to 160 ° C.) at which the resin of the shape-memory rubber molded article softens, for example, by sending hot air. Opening 2 of mounting base 22
2a may be returned to a substantially U-shaped cross section again and assembled to the flange. According to this, a strong force is not required for assembling to the flange.

[0027]

As described above, according to the first aspect of the present invention, the shape memory rubber molded body obtained by dispersing and blending a granular resin material with a vulcanizable rubber at the mounting base of the weather strip is substantially U-shaped. Since it is formed into a U-shape and can be restored to a substantially U-shaped cross section by heat treatment even if deformed, it is sufficient for the flange to be inserted without particularly embedding the core metal in the mounting base as shown in the past. A holding force is obtained, and it is possible to follow the bending of the mounting base at the time of mounting to the vehicle body corner.

According to the second aspect of the present invention, when manufacturing a weatherstrip, the mounting base is formed of a shape-memory rubber molded product obtained by dispersing and blending a granular resin material into a vulcanizable rubber. And memorize the state of the cross-section of approximately U-shape,
Since the sizing is performed so that the opening of the mounting base is wider than the substantially U-shaped cross section as a pre-process of attaching the double-sided tape to the inside of the side wall, the double-sided tape can be easily attached.

According to the third aspect of the present invention,
When the heat treatment is performed at a predetermined temperature at which the resin of the shape memory rubber molded article softens, the opening of the mounting base can be returned to the original substantially U-shaped cross-section. Can be.

Further, as described in claim 4, claim 2
After fixing the mounting base of the weatherstrip manufactured by the method for manufacturing a weatherstrip to the flange with a tape, the opening of the mounting base is heated by a predetermined temperature at which the resin of the shape-memory rubber molded article softens. When the section is returned to a substantially U-shape, there is no need to apply a strong force to assemble the flange.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a weather strip manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a weather strip in a state where the weather strip is extruded from an extruder 101 shown in FIG.

FIG. 3 is a cross-sectional view showing the weather strip in a state where the tape is attached and output from the sizing die 103 shown in FIG. 1;

FIG. 4 is a sectional view showing the weather strip in a state where the weather strip is output from the heating furnace 105 shown in FIG.

FIG. 5 is a sectional view showing a weather strip according to a conventional example.

FIG. 6 is a perspective view showing a state before manufacturing the weather strip shown in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Weather strip 2 Mounting base 2a opening 3 Hollow seal part 4,5 Side wall 7-10 Lip part 11 Core bar 12 Seal lip part 20 Weather strip 22 Mounting base 22a Opening 23 Hollow seal part 24,25 Side wall 27,28 Lip Part 29 double-sided tape 29a liner 30 seal lip part 101 extruder 102 vulcanizing furnace 103 sizing die 104 tape stretching machine 105 heating furnace 106 cooling tank

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Claims (4)

[Claims] 1. A mounting base having a substantially U-shaped cross section and inserted from an opening side into a flange formed at an opening edge of a vehicle body of an automobile, a hollow seal part integrally formed with the mounting base, A lip portion formed inside one side wall and holding the flange, and a weatherstrip provided with a double-sided tape attached to the inside of the other side wall of the mounting base and holding the flange together with the lip portion. At least the mounting base is formed of a shape-memory rubber molded product obtained by dispersing and blending a granular resin material into a vulcanizable rubber, and is capable of being restored to the substantially U-shaped cross section by heat treatment. Weather Strip. 2. A mounting base, which has a substantially U-shaped cross section and is inserted into a flange formed on an opening edge of a vehicle body of an automobile from an opening side, a hollow seal part integrally formed with the mounting base, A method of manufacturing a weatherstrip including a lip formed inside one side wall and holding the flange, and a double-sided tape attached to the inside of the other side wall of the mounting base and holding the flange together with the lip. Wherein at least the mounting base is formed of a shape memory rubber molded product obtained by dispersing and mixing a granular resin material into a vulcanizable rubber, and the hollow seal portion and the lip portion are integrally formed. An extrusion step of extruding the mounting base in a vulcanizing furnace with a substantially U-shaped cross section; a sizing step of further expanding the opening of the mounting base from a substantially U-shaped cross section; Adhering a double-sided tape to the inside of the other side wall of the mounting base whose part has been widened. 3. A mounting base having a substantially U-shaped cross section and inserted from an opening side into a flange formed at an opening edge of a vehicle body of an automobile, a hollow seal part integrally formed with the mounting base, A method of manufacturing a weatherstrip including a lip formed inside one side wall and holding the flange, and a double-sided tape attached to the inside of the other side wall of the mounting base and holding the flange together with the lip. Wherein at least the mounting base is formed of a shape memory rubber molded product obtained by dispersing and mixing a granular resin material into a vulcanizable rubber, and the hollow seal portion and the lip portion are integrally formed. An extrusion step of extruding the mounting base into a vulcanizing furnace with a substantially U-shaped cross section; a sizing step of further expanding the opening of the mounting base from a substantially U-shaped cross section; An attaching step of attaching a double-sided tape to the inside of the other side wall of the attached mounting base, and performing a heat treatment at a predetermined temperature at which the resin of the shape-memory rubber molded article softens to open the opening of the mounting base in the cross-section. A method for producing a weatherstrip, comprising: a shape restoring step of returning to a U-shape; and a cooling step. 4. The method according to claim 2, wherein the mounting base of the weatherstrip is tape-fixed to the flange, and then the resin of the shape-memory rubber molded body is softened. A method of assembling a weatherstrip, wherein the method is heat-treated at a temperature to return the opening of the mounting base to the substantially U-shaped cross section and assemble the flange with the flange.