JP2005212714A - Weather strip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a sink mark on a die-molded part with a core removal hole opened, and increase the quality of appearance and a sealing function. <P>SOLUTION: A projection portion 25 is protruded from a part of an inner circumference 24 of the core removal hole 23 opened in the die-molded part 5B, and two slits 26 are formed in positions opposite to the projection portion 25. The area between the two slits 26 is a bridge portion 27. The root of the bridge portion 27 is deformed back toward the projection portion 25, and a tip end 10 of the bridge portion 27 is fixed with adhesive to a tip face 11 of the projection portion 25. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention mainly relates to the structure of a weather strip such as a drip weather strip or a door weather strip, and in particular, for extracting a core into a mold forming portion formed continuously with a general portion which is an extrusion forming portion. The present invention relates to a weather strip structure in which a core hole is formed.

When a core punching hole for extracting a core involved in forming a hollow part may be formed in the wall of the weatherstrip mold part, the core punching hole has a certain length. In order to maintain the strength of the molded part, the inner peripheral surfaces of the core punched holes after the cores are removed are bonded and fixed together. For example, in the structure described in Patent Document 1, a concave portion is formed on the wall surface (inner peripheral surface) of the core punch hole, a convex portion is formed on the opposite wall surface, and the concave portion and the convex portion are fitted to each other and then the wall surface is formed. Are fixed to each other. Thus, the wall surface can be restricted from shifting in the longitudinal direction and depth direction of the core hole.
Japanese Patent Application Laid-Open No. 10-217872

  However, in the structure of the weather strip described in Patent Document 1, since the wall surface in which the concave portion is formed and the wall surface in which the convex portion are formed are fitted to each other, the concave and convex portions are bonded and fixed. As a result, the wall surface is pulled, and as a result, a phenomenon in which the outer surface of the wall portion having the concave portion and the outer surface of the wall portion having the convex portion is gradually recessed may be a so-called sink.

  The outer surface of the wall portion where sink marks are generated is unfavorable in appearance. For example, when sink marks occur in a portion that exhibits a sealing function by elastic contact with the counterpart member, the sealing function may be impaired. Further, for example, when sink marks occur in a portion that is fitted and held in the sash on the vehicle body side, the weather strip may fall off from the sash locally, and there is still room for improvement.

  The present invention has been made paying attention to such problems, and by improving the structure of the molded portion of the weather strip, particularly the structure around the core punch hole, the occurrence of sink marks in the wall portion is obviated. It is intended to provide a weather strip that can be prevented.

  The invention according to claim 1 includes a general part and a mold part formed continuously with the general part, and the mold part includes a closed part including two wall parts that are adjacent to each other and form a predetermined angle. A hollow portion having a cross-sectional shape is formed, and one of the two wall portions is formed with a core hole for extracting the core involved in forming the hollow portion. It is assumed that it is a weather strip.

  Then, an overhanging portion that locally narrows the opening region of the core punching hole to form a constricted portion is formed on a part of the inner peripheral surface of the core punching hole, and the core In the part of the inner peripheral surface of the punched hole facing the tip of the overhanging part, at least two slits continuing from the same part to the other wall part and the core punching hole are formed and sandwiched by the two slits. The region is a bridge portion, and this bridge portion is bonded and fixed to the tip of the overhang portion.

  That is, according to the first aspect of the present invention, the bridge portion is locally separated from the wall portion by forming two slits extending from the wall portion in which the core punching hole is formed to the adjacent wall portion. Is forming. And since the bridge portion is adhesively fixed to the overhanging portion, only the bridge portion is deformed by the adhesive fixing, and a structure that prevents the forces pulled from each other from acting on the entire wall portion of the molded portion It has become.

  In addition, the said general part is formed as a thing of a substantially uniform cross-sectional shape in a longitudinal direction by extrusion molding in many cases.

  At the end position of the slit corresponding to the root of the bridge portion, the slit width is enlarged as described in claim 2, or the slit width is enlarged in an arc shape as described in claim 3. It is desirable.

  The molded part according to claim 1 also includes a molded part having a mounting base and a seal lip integral with the mounting base and having a hollow mounting base as described in claim 4. included.

  Further, when the core punching hole is large in the longitudinal direction, a plurality of projecting portions are formed in a zigzag shape along the longitudinal direction of the core punching hole as described in claim 5, and It is desirable to form a bridge portion with at least two slits in each portion facing the tip.

  Therefore, in the inventions of the first to fifth aspects, the bridge portion is bonded and fixed to the tip of the overhanging portion, so that the outer surface of the wall portion of the weather strip, in particular, the mating member exerts a sealing function by elastic contact. Occurrence of sink marks at the site is prevented in advance, which can contribute to the improvement of the sealing function. In particular, the invention according to claim 4 improves the holding function and prevents the weather strip from falling off the sash.

  According to the first to fifth aspects of the present invention, it is possible to prevent the occurrence of sink marks at the wall portion of the molded portion in which the core punching hole is formed. At the same time, the appearance quality of the weather strip is improved, and the sealing function and holding function are improved. Further, according to the second and third aspects of the invention, there are effects of improving the demolding property at the time of molding and preventing the breakage at the end position of the slit after mounting.

  1 to 4 show a preferred embodiment of a weather strip according to the present invention. FIG. 1 shows a structure in which a front weather strip including a drip weather strip at a front end of a roof is attached to a vehicle body side in an open car. FIG. 3 is a perspective view of a molding part formed continuously with the extrusion molding part which is a general part of the drip weather strip of FIG. 1, FIG. 3 is a detailed view of the vicinity of the joint part of FIG. 2, and FIG. -A line sectional drawing is shown, respectively.

  A front weather strip 1 shown in a sectional view in FIG. 1 is continuously arranged in the vehicle width direction of a front roof portion of an open car, for example, as shown in Japanese Patent Application Laid-Open No. 10-119584. Thus, a double seal structure as described later is formed.

  The front weather strip 1 is generally composed of a welt portion 3 having a substantially U-shaped cross section in which a hollow lip 2 is integrally formed and a drip weather strip 5 having a hollow lip 4. Is adhesively fixed to the welt part 3 with a double-sided tape 9 provided at the tip of a bowl-shaped water receiving part 7 continuous with the hollow lip 4.

  The front weather strip 1 is fixed to the vehicle body side by fitting the welt portion 3 to the vehicle body panel, and the hood reinforcing material 6 indicated by the phantom line is in elastic contact with each of the hollow lips 2 and 4. Similarly, the lips 2 and 4 are deformed as indicated by phantom lines to form a so-called double seal structure that exhibits a sealing function.

  Here, paying attention to the drip weather strip 5, as shown in FIG. 2, in the longitudinal direction of the drip weather strip 5, the extrusion portion 5 </ b> A having a substantially uniform cross-sectional shape indicated by an imaginary line is continuously provided as a general portion thereof. A molded part 5B having a shape similar to that of the extruded part 5A is formed, and the cross-sectional shape of the molded part 5B changes smoothly in the longitudinal direction. Further, as shown in FIG. 3, the end portion of the front weather strip 1 is connected to the roof weather strip 6 via a mold forming portion 5B.

  As shown in FIG. 4 in addition to FIG. 2, the mold forming part 5 </ b> B is mainly composed of a hollow lip 17, and the hollow lip 17 has a core (not shown) used for forming the hollow part 19. A core punching hole 23 for extraction is formed along the longitudinal direction of the molded part 5B. The hollow lip 17 includes a lip side wall portion 18 in which a core punching hole 23 is formed, a lip bottom wall portion 15 that is adjacent to the lip side wall portion 18 and forms a predetermined angle, and a hood reinforcement shown in FIG. The lip top wall portion 16 is deformed by elastic contact with the lip 6 and has a substantially fan-shaped closed cross-sectional shape.

  In the core hole 23, a substantially trapezoidal protruding portion 25 locally narrows the opening region of the core hole 23 from a part of the inner peripheral surface 24 at a substantially central portion in the longitudinal direction. In such a manner, it is formed so as to project toward the opposed inner peripheral surface 24. Two slits 26 that are continuous with the core punching hole 23 and straddle the lip bottom wall portion 15 that is the other wall portion are formed in parallel at a portion facing the protruding portion 25. The two slits 26 are formed along the wall surface of the lip bottom wall 15 so as to be substantially orthogonal to the ridgeline formed by the lip bottom wall 15 and the lip side wall 18.

  A region sandwiched between the two slits 26 is used as a bridge portion 27, and the base portion of the bridge portion 27 is deformed so as to fall down toward the overhang portion 25, whereby the tip portion 10 of the bridge portion 27 is extended. It is bonded and fixed to the front end surface 11 of 25. For example, a fast-drying adhesive is used for bonding and fixing the bridge portion 27 and the overhang portion 25. Moreover, the shape of a dashed-dotted line shows the bridge part 27 before adhesion fixation.

  That is, in the structure of the above-described mold forming part 5B, the lip bottom wall part 15 continuous in the longitudinal direction of the mold forming part 5B is locally divided by the two slits 26, and the bridge part 27 is extended. The bridge portion 27 is only deformed so as to fall inward even when it is bonded and fixed to the lip, so that almost no force is applied to the lip top wall portion 16 and the lip bottom wall portion 15.

  Therefore, according to the structure of the molded part 5B, sink marks do not occur on the outer surface of the lip top wall part 16 even if the bridge part 27 is bonded and fixed to the projecting part 25 as described above. As a result, the appearance quality of the molded part 5B is improved, and the sealing function when the hood reinforcing material 6 comes into contact with the lip top wall part 16 is improved.

  The two slits 26 formed in the lip bottom wall portion 15 are set to a length that allows the bridge portion 27 to be bonded and fixed to the protruding portion 25 without pulling and deforming the bridge portion 27.

  5 and 6 show a second embodiment of the present invention, and FIG. 5 shows a perspective view of a corner portion which is a molded portion of a door weather strip. FIG. 6 shows a cross-sectional view taken along the line BB in FIG.

  As is well known, a door weatherstrip is generally composed of, for example, a mounting base that is fitted and held in a sash disposed at the periphery of an automobile door opening, and a hollow seal lip formed integrally with the mounting base. In addition, when the door is closed, the sealing lip is brought into elastic contact with the vehicle body panel to exert a sealing function.

  As shown in FIGS. 5 and 6, the corner portion 30, which is a molding portion formed continuously with the extrusion molding portion (not shown) of the door weather strip, includes a mounting base portion 31 fitted and held in a sash 39 and its mounting base portion 31. The mounting base 31 and the hollow lip 32 which is an integral seal lip are generally configured. A hollow portion 43 is formed across the attachment base portion 31 and the hollow lip 32, and a core (not shown) used to form the hollow portion 43 is extracted from the bottom wall portion 34 of the attachment base portion 31. A core hole 35 is formed along the longitudinal direction of the corner portion 30.

  In the core punching hole 35, as in the structure of the first embodiment, an overhanging portion 36 protrudes from a part of the inner peripheral surface 41, and there are two portions facing the overhanging portion 36. Two slits 37 are formed in parallel.

  Then, a region sandwiched between the two slits 37 is used as a bridge portion 38, and the base portion of the bridge portion 38 is deformed so as to fall toward the overhang portion 36, whereby the tip portion 28 of the bridge portion 38 is deformed. It is fixed to the front end surface 29 by adhesion. Moreover, the shape of a dashed-dotted line shows the bridge part 38 before adhesion fixation.

  The corner portion 30 is fixed to the vehicle body side by fitting the attachment base portion 31 to the sash 39 as shown in FIG. 6, but the sash is shown in FIG. 5 to show the structure of the core hole 35. 39 is omitted.

  Therefore, according to the structure of the corner portion 30, the occurrence of sink marks on the outer surfaces of the side wall portions 40 and 42 serving as the side walls of the mounting base portion 31 is prevented by the same function as that of the first embodiment, and at the same time, the mounting base portion 31. Can be prevented from falling out of the sash 39.

  FIGS. 7 and 8 show a third embodiment of the present invention. FIG. 7 is a perspective view of a corner portion in which a core punching hole is enlarged as compared with FIG. 5, and FIG. 7 is a cross-sectional view taken along the line CC of FIG. 7, and FIG. 7B is a cross-sectional view taken along the line DD of FIG. In FIGS. 7 and 8, the same reference numerals are given to the portions common to the second embodiment shown in FIGS.

  As shown in FIGS. 7 and 8, a corner portion 49, which is a mold forming portion formed continuously with an extrusion molding portion (not shown), is generally composed of an attachment base portion 50 and a hollow lip 32. In the bottom wall portion 51 of the mounting base portion 50, a core hole 54 for extracting a core (not shown) used for forming the hollow portion 43 is formed, and the projecting portion 52 and the bridge portion 53 are respectively formed. A plurality of so-called staggered patterns are alternately formed in the longitudinal direction of the core punching holes 54, and these are individually bonded and fixed.

  More specifically, the substantially trapezoidal protruding portion 52 from three locations on the inner peripheral surface 55 of the core punching hole 54 is opposed to the inner peripheral surface 55 so as to locally narrow the opening area of the core punching hole 54. The projecting portions 52 are formed along the longitudinal direction of the core hole 54. Two slits 56 are formed in parallel at the portion facing the tip of the overhanging portion 52 so as to be continuous with the core punching hole 54 and over the side wall portion 57 and the side wall portion 58 which are the other wall portions. . The two slits 56 are formed so as to be substantially orthogonal to the ridge line formed by the bottom wall portion 51 and the side wall portions 57 and 58.

  Then, a region sandwiched between the two slits 56 is used as a bridge portion 53, and the base portion of the bridge portion 53 is deformed so as to fall down toward the overhang portion 52, so that the tip portion 47 of the bridge portion 53 is extended. 52 are fixedly bonded to the front end surface 48 of each. Moreover, the shape of a dashed-dotted line shows the bridge part 53 before adhesion fixation. In FIG. 7, the sash 60 is omitted to show the structure of the core punching hole 54.

  Further, when the bridge portion 53 is formed only on the side wall portion 57 side, for example, the outer surface of the side wall portion 57 is continuously and locally recessed, so that the zigzag pattern is formed along the longitudinal direction of the core hole 54. It is desirable to form the bridge portion 53 in a shape.

  Therefore, according to the structure of the corner portion 49, when it is necessary to form a plurality of the overhang portions 52 and the bridge portions 53 in the mounting base portion 50 and to be individually bonded and fixed, along the longitudinal direction of the core punching hole 54 It can be said that forming each of them in a staggered manner is advantageous in preventing the attachment base 50 from falling off the sash 60.

  9 and 10 show a fourth embodiment of the present invention, and FIG. 9 shows a perspective view of a corner portion which is a mold forming portion of a weather strip for a trunk room. FIG. 10 shows a cross-sectional view taken along line EE in FIG.

  2. Description of the Related Art As is well known, a trunk strip weather strip (hereinafter referred to as a trunk seal) is, for example, a hollow having a substantially U-shaped cross section attached to the periphery of an opening of an automobile trunk room and a hollow formed integrally with the welt portion. The seal lip is generally configured, and when the trunk lid is closed, the trunk lid is elastically brought into contact with the seal lip to exert a sealing function.

  As shown in FIGS. 9 and 10, the corner portion 70, which is a die-molded portion formed continuously from the unillustrated extruded portion of the trunk seal, has a substantially U-shape that is an attachment portion to the vehicle body side. The lip side wall portion 79 of the hollow lip 73 is provided with a hollow portion 82. The lip side wall portion 79 of the hollow lip 73 is generally composed of a welt portion 71 and a hollow lip 73 having a substantially rhombic cross section formed of, for example, sponge rubber. A core punching hole 75 for extracting a core (not shown) used for molding is formed. The hollow lip 73 is formed in a closed cross-sectional shape by a lip top wall portion 74 elastically contacting a trunk lid (not shown), lip side wall portions 79 and 81 adjacent to the lip top wall portion 74, and a welt portion 71. Yes.

  In the core punching hole 75, as in the structures of the first and second embodiments, a projecting portion 76 is formed to project from a part of the inner peripheral surface 80. Two slits 77 are formed in parallel.

  Then, a region sandwiched between the two slits 77 is used as a bridge portion 78, and the base portion of the bridge portion 78 is deformed so as to fall toward the overhang portion 76, so that the tip portion 68 of the bridge portion 78 becomes the tip surface 69 of the overhang portion 76. Bonded and fixed. Moreover, the shape of a dashed-dotted line shows the bridge part 78 before adhesion fixation.

  Therefore, according to the structure of the corner portion 70, the function similar to the first and second embodiments prevents the occurrence of sink marks on the outer surface of the lip top wall portion 74, and the trunk lid is formed on the lip top wall portion 74. The sealing function of the corner part 70 at the time of elastic contact improves.

  FIG. 11 shows a perspective view of a molded part when the slit width at the end positions of the two slits 26 in FIG. 2 is enlarged in an arc shape as a fifth embodiment of the present invention. In FIG. 11, parts that are the same as those in the first embodiment shown in FIG.

  As shown in FIG. 11, as the structure of the molded part 90 formed continuously with the extrusion molding part (not shown), the slit width is enlarged in an arc shape at the end position of the two slits 26 to form a circular hole 91. Has been. By forming the circular hole 91, the force when the bridge portion 27 is bent and deformed is more reliably prevented from reaching the region of the lip bottom wall portion 15 adjacent to the bridge portion 27, and at the end position. It is possible to alleviate the stress concentration that occurs.

  Needless to say, the structure in which the slit width is increased in an arc shape at the end positions of the two slits 26 can be applied to any of the first to fourth embodiments described above.

  As described above, according to the present embodiment, it is possible to prevent the occurrence of sink marks on the outer surface of the molded part in which the core hole is opened. At the same time, the appearance quality of the weather strip is improved, and the sealing function and holding function are improved.

Sectional drawing which shows the structure which attached the front weather strip containing a drip weather strip to the vehicle body side in an open car. FIG. 2 is a perspective view showing a molded part formed continuously with the general part of the drip weather strip of FIG. 1 as the first embodiment of the present invention. FIG. 3 is a detailed view showing the vicinity of a joint portion of the mold forming portion of FIG. 2. Sectional drawing which follows the AA line of FIG. The perspective view which shows the corner part of a door weather strip as the 2nd Embodiment of this invention. Sectional drawing which follows the BB line of FIG. The perspective view which shows the corner part in which the core punching hole was expanded as FIG. 5 as 3rd Embodiment of this invention. (A) is sectional drawing which follows the CC line of FIG. 7, (b) is sectional drawing which follows the DD line | wire of FIG. The perspective view which shows the corner part of the weather strip for trunk rooms as the 4th Embodiment of this invention. Sectional drawing which follows the EE line | wire of FIG. FIG. 10 is a perspective view showing a mold part in which the slit width is enlarged in an arc shape at the end positions of two slits in FIG. 2 as a fifth embodiment of the present invention.

Explanation of symbols

5A ... Extrusion molded part (general part)
5B ... Molding portion 15 ... Lip bottom wall (the other wall)
18 ... Lip side wall (wall)
DESCRIPTION OF SYMBOLS 19 ... Hollow part 23 ... Core hole 24 ... Inner peripheral surface 25 ... Overhang | projection part 26 ... Slit 27 ... Bridge part 30 ... Corner part (molding part)
31 ... Mounting base 32 ... Hollow lip (seal lip)
34 ... Bottom wall (wall)
35 ... Core hole 36 ... Overhang portion 37 ... Slit 38 ... Bridge portion 40 ... Side wall (the other wall)
43 ... hollow part 49 ... corner part (molding part)
50 ... Mounting base 51 ... Bottom wall (wall)
52 ... Overhang portion 53 ... Bridge portion 54 ... Core hole 55 ... Inner peripheral surface 56 ... Slit 57 ... Side wall (the other wall)
58 ... side wall (the other wall)
70 ... Corner part (molding part)
74 ... Lip top wall (the other wall)
75 ... Core hole 76 ... Overhang 77 ... Slit 78 ... Bridge 79 ... Lip side wall (wall)
80 ... Inner peripheral surface 82 ... Hollow part 90 ... Molding part 91 ... Circular hole

Claims (5)

A general part and a molded part formed continuously with the general part,
In the molded part, a hollow part having a closed cross-sectional shape including two wall parts forming a predetermined angle while being adjacent to each other is formed,
In the weather strip in which one of the two wall portions is formed with an opening for core extraction for extracting the core involved in forming the hollow portion,
On the part of the inner peripheral surface of the core punching hole, an overhanging portion that locally narrows the opening region of the core punching hole and forms a narrowed portion is projected and formed,
In the portion of the inner peripheral surface of the core punching hole facing the tip of the overhanging portion, at least two slits that are continuous with the core punching hole are formed from the same portion to the other wall portion,
A weather strip, wherein a region sandwiched between the two slits is used as a bridge portion, and the bridge portion is bonded and fixed to the tip of the projecting portion.   The weather strip according to claim 1, wherein the slit width is enlarged at the end position of the slit corresponding to the root portion of the bridge portion.   The weather strip according to claim 2, wherein the slit width is enlarged in an arc shape at the end position of the slit.   The weather according to any one of claims 1 to 3, wherein the molded part has an attachment base and a seal lip integral with the attachment base, and the attachment base is a hollow part. strip. A plurality of projecting portions are formed in a staggered manner along the longitudinal direction of the core punching hole,
The weather strip according to any one of claims 1 to 4, wherein a bridge portion having at least two slits is formed in each portion facing the tip of each overhang portion.

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