JP2005349901A - Weather strip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a product easy to mount to a mounting flange and difficult to detach from the mounting flange in a small thermoplastic elastomer weather strip smaller than a normal weather strip such as a sensor weather strip, and provided with lips projected from an inner wall of a forked grip. <P>SOLUTION: In this weather strip for an automobile, a lip 13 with a thick part 14 at a tip end is projected from an inner wall of a U-sectioned forked grip 11 to be mounted to a mounting flange 1. A recess 15 with a size large enough to receive at least one part of the thick part 14 of the elastically deformed lip 13 when mounting to the mounting flange 1 is formed on the inner wall of the forked grip 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a weather strip that is smaller than a normal weather strip such as a sensor weather strip.

Conventionally, as shown in FIG. 1 and FIG. 2, the front end of the sliding rear door 2 is prevented from being caught between the front end of the rear door 2 and the rear end of the front door 3. A small sensor weather strip 20 in which the sensor C is embedded is attached (for example, see Patent Document 1).
Japanese Patent No. 3435486

  Further, as shown in FIG. 3, as such a small weather strip 30, a plurality of claw pieces to be attached to the attachment flange portion 1 provided on the body panel from the inner wall of the bifurcated grip portion 31 having a U-shaped cross section. There is a projecting 32.

  The weather strip 30 usually has a bifurcated grip 31 because the existing sensor C is as small as about 4.5 mm in diameter and the gap between the rear end of the front door 3 and the front end of the rear door 2 is narrow. The width (W) is 6.5 mm and the height (H) is about 11.1 mm, which is smaller than a normal weather strip (a normal weather strip has a width of about 10 mm and a height of about 15 mm). ).

  Further, the weather strip 30 is usually molded from EPDM rubber, but molding it with a thermoplastic elastomer contributes to weight reduction.

  However, when molded with a thermoplastic elastomer, there is a problem that it is difficult to attach to the mounting flange portion 1 as compared with the case of molding with EPDM rubber, and it is easy to come off from the mounting flange portion 1.

  That is, the holding force with respect to the mounting flange portion 1 greatly depends on the modulus of the substance, and the modulus is greatly lowered when the EPDM rubber having the same hardness is replaced with the thermoplastic elastomer. Therefore, if the modulus of the thermoplastic elastomer is equivalent to that of EPDM rubber, the rigidity increases and the attachment force to the attachment flange portion 1 increases. On the other hand, flexibility is inferior and flexibility is reduced. Since such attachment force and holding force are in an inverse relationship, it is not easy to mold a small weather strip that is easy to attach with a thermoplastic elastomer and that has a high holding force.

  From such a point, as shown in FIG. 4, means for forming an arcuate thick portion 43 at the tip of the claw piece 42 can be considered. By forming the thick portion 43, the circular arc surface makes it easy to attach to the attachment flange, and since it is circular and thick, it is difficult to come off after attachment.

  However, since the sensor weather strip 40 is small, the circular portion 43 of the claw piece 42 abuts against and interferes with the inner wall of the bifurcated grip portion when the sensor weather strip 40 is attached to the attachment flange portion 1, making attachment difficult. There's a problem.

  In the case of EPDM, there is also a demand for reducing the insertion force without reducing the holding force so much.

  The present invention has been devised in view of these points, and is a vehicle weather strip that is smaller than a normal weather strip such as a sensor weather strip and has a claw piece protruding from the inner wall of a bifurcated grip portion. It is an object of the present invention to provide a product that is easy to mount and is difficult to come off from the mounting flange.

  This will be described with reference to FIGS. According to the first aspect of the present invention, a claw piece 13 provided with a thick portion 14 at the tip is projected from the inner wall of the bifurcated grip portion 11 having a U-shaped cross section to be attached to the mounting flange portion 1. In the automobile weather strip, at least a part of the thick portion 14 of the claw piece 13 elastically deformed when being attached to the mounting flange portion 1 can enter the inner wall of the bifurcated grip portion 11. A concave portion 15 having a size is formed.

  According to the second aspect of the present invention, a claw piece 13 provided with a thick portion 14 at the front end portion is projected from the inner wall of the bifurcated grip portion 11 having a U-shaped cross section to be attached to the mounting flange portion 1. The automobile weather strip has a size that allows at least a part of the thick portion 14 of the claw piece 13 elastically deformed to be attached to the inner wall of the bifurcated grip portion 11 when being attached to the mounting flange portion 1. The thick portion 14 having a thickness of about 0.2 to 1.2 mm protrudes toward the inner wall of the bifurcated grip portion 11. .

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the core material 12 having a U-shaped cross section is embedded in the bifurcated grip portion 11, and the depth P of the recess is The distance between the inner wall of the mold grip part 11 and the core member 12 is set to 5 to 90%, preferably 20 to 70%.

  The invention according to claim 4 is the invention according to claim 1, 2, or 3, wherein the core material 12 is made of a thermoplastic resin.

  In the first aspect of the present invention, a claw piece 13 provided with a thick portion 14 at the tip is projected from the inner wall of the bifurcated grip portion 11 having a U-shaped cross section to the mounting flange portion 1. In a weather strip for automobiles, a recess 15 having a size that allows at least a part of the thick portion 14 of the claw piece 13 elastically deformed when attached to the attachment flange portion 1 to enter the inner wall of the bifurcated grip portion 11. Since it is formed, the thick wall portion 14 of the elastically deformed claw piece 13 does not interfere with the inner wall of the bifurcated grip portion 11 when attached to the attachment flange portion 1. Therefore, it can be easily mounted on the mounting flange portion 1. Further, since it exhibits a high holding force, it is difficult to detach from the mounting flange portion 1.

  In addition to the structure of claim 1, the invention described in claim 2 is such that a thick portion 14 having a thickness of about 0.2 to 1.2 mm protrudes from the inner wall of the bifurcated grip portion 11. Since the thick portion 14 of the claw piece 13 does not interfere with the inner wall of the bifurcated grip portion 11 when attached to the attachment flange portion 1, it can be easily attached to the attachment flange portion 1.

  In addition to the structure of claim 1 or 2, the invention described in claim 3 embeds a core material 12 having a U-shaped cross section in the bifurcated grip portion 11, and sets the depth P of the recess to a bifurcated type. Since the distance S between the inner wall of the grip part 11 and the core member 12 is set to 5 to 90%, preferably 20 to 70%, the rigidity of the bifurcated grip part 11 can be increased and the recess 15 is also formed. Can do. Therefore, it is possible to easily attach to the mounting flange portion 1 while avoiding interference between the circular portion 14 and the inner wall of the double fork grip portion 11.

  In the invention according to the fourth aspect, since the core material 12 is made of a thermoplastic resin, the weight can be reduced as compared with the case where the core material 12 is made of metal.

  An embodiment of a weather strip 10 according to the present invention is shown in FIGS. 1, 5 and 6. This is because a claw piece 13 provided with an arcuate thick portion 14 at the tip is projected from each side wall of the bifurcated grip portion 11 having a U-shaped cross section to be attached to the mounting flange portion 1. It is a weather strip for automobiles.

  The weather strip 10 includes a hollow portion 16 in which a sensor C is embedded at the distal end portion of the double-breasted grip portion 11, and is attached to the distal end portion of the sliding electric rear door 2. Then, when a hand or the like is sandwiched between the front end portion of the rear door 2 and the rear end portion of the front door 3, the slide movement of the rear door 2 is automatically stopped by detecting it and ensuring safety. This is a so-called sensor weather strip.

  At least a part of the arcuate thick portion 14 of the claw piece 13 elastically deformed when being attached to the attachment flange portion 1 can be penetrated into both inner walls of the bifurcated grip portion 11 of the weather strip 10. The recess 15 is formed. The recess 15 has a square shape.

  Accordingly, when the claw piece 13 is elastically deformed by elastic contact with the mounting flange portion 1 when being attached to the mounting flange portion 1, the outer surface of the claw piece 13 enters the concave portion 15, so that the inner wall of the bifurcated grip portion 11 Avoid interference. Thereby, since the nail | claw piece 13 can fully elastically deform, it can attach to the flange part 1 for attachment easily.

  In the small weather strip 10 according to the present embodiment, the double crotch grip portion 11 has a width W of 6.5 mm and a height H of 11.1 mm, and the arc-shaped thick portion has a diameter D of about 0.8 mm. Yes, it is small compared to normal weather strips.

  Further, a core material 12 having a U-shaped cross section is embedded in the bifurcated grip portion 11, and the depth P of the concave portion is set to about 30% of the thickness of the core material 12 and the inner wall of the bifurcated grip portion 11. It is set. Further, the core material 12 is formed of a thermoplastic resin. Assuming weight reduction, the core 12 is embedded to increase the rigidity of the bifurcated grip portion 11 to further increase the holding force with respect to the mounting flange portion 1 and to ensure the separation from the mounting flange portion 1. Can be prevented.

  In addition, as shown in FIG. 7, the weather strip 10 which concerns on this invention can make the recessed part 15 into a semicircle shape. Moreover, as shown in FIG. 8, it can also form in the whole upper part of the inner wall of the bifurcated grip part 11. FIG. In either case, interference between the arc-shaped thick portion 14 and the inner wall of the bifurcated grip portion 11 can be avoided and the attachment to the attachment grip can be facilitated.

  The weather strip according to the present invention can be applied not only to the sensor weather strip but also to other similar weather strips.

  Examples of usable materials include synthetic rubbers typified by EPDM (ethylene-propylene-diene terpolymer rubber) and thermoplastic elastomers TPE (Thermoplastics elastomer).

  Thermoplastic elastomers are composed of a rubber component (soft segment) for exerting elasticity and a resin component (hard segment) that flows at high temperature but prevents plastic deformation at normal temperature, and is plasticized at high temperature to be thermoplastic. It is a material that can be molded in the same way as resin.

  For example, in FIGS. 3 and 9, in the weather strip in which the width W of the bifurcated grip portion 11 is about 6 to 8 mm and the height H is about 8 to 13 mm, the diameter D of the arc-shaped thick portion 14 is set to 0. The depth P of the concave portion 15 can be set to 5 to 90%, preferably 20 to 90% of the distance S between the inner wall of the double-breasting grip portion and the core member 12.

  The inventors of the present invention conducted experiments on the ease and attachment of the weather strip 10 having the concave portion 15 according to the present invention and the conventional weather strip having no concave portion 15 to the attachment grip.

The experimental results are shown in Table 1.

TPO: Olefin-based thermoplastic elastomer TPS: Styrenic thermoplastic elastomer TPVC: Vinyl chloride-based thermoplastic elastomer Judgment criteria: Insertion force is evaluated as 60 kg / 100 mm or less, and holding force is evaluated as 130 kg / 100 mm or more. No problem in practical use ×: There is a problem in practical use

  As is apparent from the experimental results, the weather strip 10 according to the present invention does not have a large insertion force with respect to the mounting flange portion 1 (that is, is easy to mount), and has a sufficiently high holding force after mounting. It does not come off from the flange portion 1.

  In contrast, the conventional technology product made of EPDM rubber has both insertion force and holding force within the appropriate range due to its physical properties, but the conventional technology made of the same thermoplastic elastomer as the molding material of the present invention has a high insertion force. This is not preferable because of its low holding power.

In [Table 1], as shown in FIG. 9, the grip engraving P% is the state in which the claw piece 13 is elastically deformed when attached to the attachment flange 1.
P = (Diameter of arc-shaped thick part D + Gap between inner wall of bifurcated grip part and thick part G−Distance S between inner wall of bifurcated grip part and core material) ÷ (Inner wall of bifurcated grip part and core Distance to material S) x 100
I asked for it.

Therefore, when the diameter D of the circular portion is 0.8 mm, the gap G between the inner wall of the bifurcated grip portion and the circular portion is 0.15 mm, and the distance S between the inner wall of the bifurcated grip portion and the core is 0.75 mm. The grip engraving P is
P = {(0.8 + 0.15-0.75) ÷ 0.75} × 100 = 26.7%
It becomes.

  The grip engraving P can be formed in a range of 5 to 90%, but is preferably in a range of 20 to 70%. That is, if it is less than 5%, the amount of the thick portion entering the recess is small and the insertion force is increased. When it exceeds 90%, a structural problem occurs when the core material is a metal.

It is a side view which shows the motor vehicle in which a weather strip is attached. FIG. 2 shows a weather strip according to a conventional example, and is a cross-sectional view taken along line XX of FIG. 1. It is sectional drawing which shows the weather strip which concerns on another prior art example. It is sectional drawing which shows the weather strip concerning another prior art example. It is sectional drawing which shows embodiment of the weather strip which concerns on this invention. It is sectional drawing which shows the state which attached the weather strip shown in FIG. 5 to the flange part for attachment. It is sectional drawing which shows other embodiment of this invention. It is sectional drawing which shows other embodiment of this invention. It is a partial expanded sectional view which shows the predetermined part for calculating | requiring the depth of a recessed part in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mounting flange part 2 Rear door 3 Front door 10 Weather strip 11 Bifurcated grip part 12 Core material 13 Claw piece 14 Thick part 15 Recessed part 16 Hollow part 20 Sensor weather strip 30 Weather strip 31 Bifurcated grip part 32 Claw piece 40 Weather strip 41 Double-branch grip part 42 Claw piece 43 Thick part C Sensor D Diameter of arc-shaped thick part G Gap between inner wall of grip and circular part H Height of double-branch grip part P Depth of recess S Distance between the inner wall of the bifurcated grip and the core W Width of the bifurcated grip

Claims (4)

  A claw piece (13) provided with a thick part (14) at the tip is projected from the inner wall of the bifurcated grip part (11) having a U-shaped cross section for attachment to the attachment flange part (1). A weather strip for an automobile, wherein the recess (15) has a size that allows at least a part of a thick portion of a claw piece elastically deformed when being attached to an inner wall of the bifurcated grip portion to be inserted into the mounting flange portion. A weather strip for automobiles, characterized in that it is formed.   A claw piece (13) provided with a thick part (14) at the tip is projected from the inner wall of the bifurcated grip part (11) having a U-shaped cross section for attachment to the attachment flange part (1). A weather strip for an automobile, wherein the recess (15) has a size that allows at least a part of a thick part of a claw piece elastically deformed when being attached to an inner wall of the bifurcated grip part to be inserted into the attachment flange part. A weather strip for automobiles, characterized in that a thick portion having a thickness of about 0.2 to 1.2 mm protrudes toward the inner wall of the double-breasted grip portion (11).   A core material (12) having a U-shaped cross section is embedded in the bifurcated grip portion (11), and the depth (P) of the concave portion is set to 5 to 5 of the distance (S) between the inner wall of the bifurcated grip portion and the core material. The automobile weather strip according to claim 1 or 2, wherein the weather strip is set to 90%, preferably 20 to 70%. The automobile weather strip according to claim 1, 2 or 3, wherein the core material (12) is made of a thermoplastic resin.

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