JP6169866B2 - Weather strip - Google Patents

Description

  The present invention relates to a weather strip mounted on an automobile, and more particularly to a weather strip having a resin core embedded therein.

  2. Description of the Related Art Conventionally, as is well known, a weather strip mounted on an automobile employs a resin core material embedded in place of a metal core material. For example, Patent Document 1 discloses a resin material that is a core material containing a reinforcing material such as talc or glass fiber filler.

  In the weather strip described in Patent Document 1, a resin core material having a shape similar to the mounting base is embedded in a mounting base having a substantially U-shaped cross section. The weather strip is attached to the vehicle body side by fitting and holding the flange portion on the vehicle body side in the U-shaped space of the mounting base portion.

JP 2004-149102 A

  However, in a conventional weather strip that employs a resin core material, the core material itself is formed of a single resin material, and thus, for example, a body side weather strip attached to a vehicle body side door opening is used. Thus, when making the open side of the U-shaped cross-sectional shape in the mounting base part an outer side far from the center of curvature and bending the bottom wall part side to the inner side to follow the mating flange part, a metal core material was adopted. The so-called mouth opening phenomenon on the open side of the U-shaped cross-sectional shape becomes remarkable as compared with the above, and the retaining property with respect to the counterpart flange portion is not always sufficient.

  Further, as disclosed in the above-mentioned Patent Document 1, when the core material is made to contain a reinforcing material such as talc or glass fiber filler to increase the rigidity of the entire core material, the follow-up to the mating flange portion In addition to concern about deterioration of properties, the weight reduction effect of the core material itself is halved, which is not preferable.

  The present invention has been made paying attention to such a problem, and provides a weather strip that is improved in retention and weight reduction, especially on the premise of adopting a resin core material.

According to a first aspect of the present invention, there is provided an attachment base formed in a substantially U-shaped cross section with a pair of side wall portions facing each other and a bottom wall portion connecting the side wall portions, and one of the attachment base portions. And a seal strip integrally formed on the portion, and a weather strip in which a resin core material having a similar shape to the mounting base is embedded in the mounting base. In addition, the core material includes a plurality of strip-shaped bone pieces having a substantially U-shaped cross section arranged side by side at a predetermined pitch in the longitudinal direction, between the corresponding portions of the bottom wall portions of the bone pieces. It is mutually connected by the connecting part which intervenes, and the corner part which the side wall part equivalent part and bottom wall part equivalent part in the above-mentioned each bone piece make other core materials except the corner part of the bone piece concerned It is characterized by being formed of a highly rigid resin material having higher rigidity than that of the portion .

In this case, in order to improve the followability to the mating flange portion, as described in claim 2, the width direction center portion of the core wall corresponding to the bottom wall portion is defined as the width direction center portion. It is desirable that it is made of a low-rigidity resin material having a lower rigidity than other portions of the core material excluding the corner portions of the bone fragments .

As a further specific configuration of the core material, as described in claim 3 , the width direction central portion of the bottom wall portion corresponding to each bone fragment and the width direction central portion of the connecting portion are It is desirable that it is made of a low-rigidity resin material having low rigidity compared to other portions of the core material excluding the central portion in the width direction and the corner portion of the bone fragment .

Furthermore, in order to reduce the weight of the core material itself, as described in claim 7 , it is desirable that other portions of the core material excluding the corner portions of the bone fragments are formed of a foamed resin material.

Therefore, in at least the first aspect of the invention, the corner portion formed by the side wall portion corresponding portion and the bottom wall portion corresponding portion of each bone piece of the core material is the core material excluding the corner portion of the bone piece. for is formed with highly rigid resin material having high rigidity as compared with the portion, for example, the open side of the U-shaped cross-sectional shape of the mounting base portion of the bottom wall side and farther outward from the center of curvature is bent as the inner mating When the opening side of the mounting base is about to open a so-called opening when following the flange, the corner portion of the core material, which is set to have a relatively high rigidity, sufficiently counters the opening phenomenon. Can do.

According to the first aspect of the present invention, since the corner portions of the bone fragments in the core material are formed of a highly rigid resin material having relatively high rigidity, the weather strip is bent to form the mating member. When trying to follow, even if the open side of the mounting base attempts to open, the corner portion having relatively high rigidity can sufficiently counter the opening phenomenon. Therefore, not only can the weight of the resin core material be reduced, but also the opening phenomenon at the mounting base is suppressed, and the weather strip retainability to the mating member is improved.

Further, according to the invention described in claim 7 , since the other portion of the core material excluding the corner portion of the bone fragment is formed of the foamed resin material, it is further advantageous in reducing the weight of the core material. It becomes.

It is a figure which shows 1st Embodiment of the weather strip which concerns on this invention, Comprising: The schematic explanatory drawing of a body side weather strip. The expanded sectional view which follows the AA line or BB line of the body side weatherstrip shown in FIG. The perspective view of the core material independent shown in FIG. The expanded sectional view which follows the CC line of the core material shown in FIG. The figure which shows the slit process process of the core material shown in FIG. It is a figure which shows 2nd Embodiment of the weather strip which concerns on this invention, Comprising: The figure corresponded in FIG. 4 in 1st Embodiment. The principal part enlarged view which shows the modification of the weather strip shown in FIG.

FIGS. 1 to 4 are views showing a specific first embodiment of a weather strip according to the present invention. FIG. 1 shows a body side weather strip (hereinafter referred to as a side weather strip) mounted on the front and rear side door openings of an automobile. FIG. 2 shows an enlarged sectional view in a free state along the lines AA and BB in FIG. 1. 3 shows a perspective view of the core material of FIG. 2 alone, and FIG. 4 shows an enlarged cross-sectional view of the core material of FIG.

  As shown in FIG. 1, for example, a flange portion 2 formed on the vehicle body panel 1 shown in FIG. 2 is in a closed loop shape at the opening edge of the vehicle body side door opening before and after being opened and closed by a side door of an automobile not shown. The weather strip 3 is also mounted in a closed loop shape in the form of a fitting and holding portion of the flange portion 2.

  As shown in FIG. 2, the weather strip 3 is formed integrally with a mounting base portion 4 having a substantially U-shaped cross section and one side wall portion 9 a of the mounting base portion 4, which will be described later, and elastically contacts the door panel 7. A hollow seal lip 5 as a seal portion is generally configured.

  The mounting base 4 is formed by connecting a pair of side wall portions 9a and 9b facing each other with a bottom wall portion 10 interposed therebetween so that the position facing the bottom wall portion 10 is an opening 4a as a whole. The resin base material 12 having a substantially similar shape to the mounting base 4 is embedded in the mounting base 4.

  The side wall portion 9b is located on the vehicle interior side when the vehicle body is mounted, and a holding lip 20 is formed on the inner wall surface thereof so as to project obliquely toward the opposite side wall portion 9a. Holding beads 19a and 19b are formed in a protruding manner on the inner wall surface of the side wall portion 9a that will be located outside the vehicle compartment when attached. The holding lip 20 and the holding beads 19a and 19b are pressed against the flange portion 2 by receiving a clamping force between the pair of side wall portions 9a and 9b when the weather strip 3 is mounted on the vehicle body. Fitted and held. Note that a cover lip 6 that conceals the terminal portion of the trim 8 that is an interior material projects from the outer corner portion formed by the side wall portion 9b and the bottom wall portion 10 toward the vehicle interior side.

  A hollow seal lip 5 is integrally formed on the outer surface of the side wall 9a so as to share the side wall 9a.

Here, the mounting base 4 is formed of a hard olefin-based thermoplastic elastomer (TPV, TPO) whose main raw material is, for example, polypropylene or polyethylene, and the hollow seal lip 5 is made of the above-mentioned polypropylene or polyethylene as its main raw material. And a soft olefin-based thermoplastic elastomer (TPV, TPO). Thus, the hollow sealing lip 5 is deformed ease deflection based on the original function, while repetitive resilience and sealing is ensured, predetermined rigidity from the viewpoint mounting base 4 is fitted and held on the flange portion 2 Is secured.

  The materials of the mounting base 4 and the hollow seal lip 5 are not limited to those described above. For example, an olefinic rubber-based material such as EPDM can be adopted. In this case, the specific gravity of the mounting base 4 is, for example, While adopting a solid rubber material of 1.2 to 1.4, it is possible to adopt a foamable rubber material having a specific gravity of, for example, 0.4 to 0.6 for the hollow seal lip 5. This is desirable for ensuring the functions of the hollow seal lip 5 and the mounting base 4.

  The core 12 embedded in the mounting base 4 is formed using polypropylene, which is a hard olefinic thermoplastic resin, as its main raw material, as will be described later.

  For this reason, all the components of the weather strip 3 are formed using olefin resin as a main raw material, and the recyclability is good.

  FIG. 3 is a perspective view showing details of the core member 12, and FIG. 4 is an enlarged cross-sectional view taken along the line CC.

  As shown in FIGS. 3 and 4, the core material 12 is a substantially U-shaped, many strip-shaped bone piece 13 and a plate-like connection for mutually connecting these bone pieces 13, 13. Part 14.

  The bone fragment 13 is formed in a U shape by a pair of leg portions 15a and 15b, each of which faces each other, and a bottom portion 16 that connects these leg portions 15a and 15b, and in the longitudinal direction. The bone fragments are arranged in parallel at a predetermined pitch with a certain interval, and the connecting portions 14 having the same thickness as the bone fragments 13 are located at the approximate center of the bottom portions 16 of these bone fragments 13. 13 are connected to each other by a connecting portion 14. The leg portions 15a and 15b correspond to the side wall portion corresponding portions in the claims, and the bottom portion 16 corresponds to the bottom wall portion corresponding portion.

  Here, as described above, the entire core material 12 is formed of, for example, a resin material in which polypropylene, which is a hard thermoplastic resin, is used as a matrix resin, and talc is contained as a reinforcing material in a predetermined ratio. However, each of the corner portions 18a and 18b formed by the pair of leg portions 15a and 15b and the bottom portion 16 of the bone piece 13 is made of a high-rigidity resin material containing a large amount of talc as the reinforcing material in the polypropylene. Is formed. In other words, in the core material 12, only the corner portions 18 a and 18 b of the bone fragments 13 are formed of a high-rigidity resin material, and the general portion or connecting portion excluding the corner portions 18 a and 18 b of the bone fragments 13. No. 14 is formed of a resin material having a lower reinforcing material content than the high-rigidity resin material.

  And the bending elastic modulus of the highly rigid resin material which forms the said corner parts 18a and 18b is set to the range of 5,000-7,000 MPa. On the other hand, the bending elastic modulus of the resin material forming the general portion other than the corner portions 18a and 18b in the core material 12 is set in the range of 2,000 to 4,000 MPa. These numerical values of the flexural modulus are based on the former JIS K 7203 (1982) (hereinafter the same).

  Further, as the resin material forming the portions other than the corner portions 18a and 18b in the core material 12, for example, a foamed resin material containing a foaming agent is used, so that the core portions 18a and 18b are not impaired in rigidity. This is advantageous for further weight reduction of the material 12. Further, in the present embodiment, polypropylene, which is a hard olefinic thermoplastic resin, is used as the matrix resin of the core material as described above. However, for example, similar polyethylene or the like can also be used. . Furthermore, a glass fiber filler or the like can be used as a reinforcing material instead of the talc.

  In order to mold the core material 12, for example, as shown in FIG. 5, a hard resin material that becomes the corner portions 18a and 18b and a resin material that becomes a general portion of the core material 12 other than the corner portions 18a and 18b. The intermediate material 12A shown in FIG. 5 is extruded and solidified as a material having a uniform cross-sectional shape in the longitudinal direction by a so-called double extrusion method. Thereafter, in a subsequent process, for example, a pair of rotating disk-shaped slitters S1 and S2 are moved relative to the intermediate material 12A in a direction perpendicular to the longitudinal direction of the intermediate material 12A, and the slit 17 ) To form a substantially U-shaped core material 12 as shown in FIG.

  Further, the core 12 formed in this way is inserted into a die of an extruder (not shown) for extruding the weather strip 3 of FIG. 2, and while the core 12 is fed out, an attachment base is formed around the core 12. The weather strip 3 having the cross-sectional shape of FIG. 2 is formed by extruding the material to be 4 and the hollow seal lip 5 under the double extrusion method.

  Therefore, as described above, the weather strip 3 configured as described above has the vehicle body panel 1 by sandwiching the flange portion 2 between the side wall portions 9a and 9b of the mounting base portion 4 of FIG. It will be fitted and held on the side.

  Specifically, as shown in FIG. 1, the weather strip 3 is formed in advance as a closed loop shape in accordance with the closed loop shape of the flange portion 2 in the door opening on the vehicle body side. 4, with the opening 4 a side being the outside and the bottom wall 10 side being the inside, the weather strip 3 is appropriately bent, and is mounted by being pushed into the flange portion 2 while following the curvature of the mating flange portion 2. become.

  In this case, for example, as shown in FIG. 1, in the corner portion Q1 or the like where the degree of curvature is particularly large (the radius of curvature is small), the weather strip 3 is bent in the process of following the flange portion 2 on the other side while being bent. As described above, the opening width of the opening 4a of the third opening 3a is a so-called open mouth compared to when the opening 4a is in a free state, and the fitting holding force with respect to the flange 2 on the other side tends to be reduced in this portion. That's right.

  However, according to the first embodiment, as described above, the resin core material 12 is embedded in the mounting base portion 4 of the weather strip 3, and each of the bone materials 12 among the bone materials 12. Since the corner portions 18a and 18b that are the starting points of bending of the pair of leg portions 15a and 15b in the piece 13 are formed of a highly rigid resin material, the opening phenomenon in the opening portion 4a of the weather strip 3 as described above. Can be countered, and the degree of opening can be suppressed.

  As a result, according to the weather strip 3 in the present embodiment, the resin core material 12 is adopted to reduce the weight, and the mouth opening phenomenon as in the conventional technique is suppressed, so The fitting holding force of the weather strip 3 with respect to the flange portion 2 on the side, and thus the holding property can be improved.

  Further, as described above, since the high-rigidity resin material containing a large amount of reinforcing material such as talc is used only in the corner portions 18a and 18b in the core material 12, the weight of the core material 12 is significantly increased. It will not bring.

  In addition, since a high-rigidity resin material is not used for the bottom portion 16 and the connecting portion 14 of each bone piece 13 in the core material 12, for example, the weather strip 3 of FIG. 2 is used as the opening 4 a of the mounting base 4. When the side wall is bent outside and the bottom wall 10 side is bent and attached to the flange 2 on the other side, the ease of bending or bending is not hindered.

  FIG. 6 shows a specific second embodiment of the weather strip according to the present invention, and shows a cross-sectional view of the core material 12 alone as in FIG. 4 in the first embodiment. In FIG. 6, the same reference numerals are given to portions common to the first embodiment.

  In the second embodiment shown in FIG. 6, the width direction central portion of the bottom portion 16 of each bone piece 13 of the core material 12 and the bone pieces 13 are connected to each other in the longitudinal direction of the core material 12. The central portion in the width direction of the connecting portion 24 is a bottom center portion 24a, and the bottom center portion 24a is lower in rigidity than the general portion of the core material 12 excluding the bottom center portion 24a and the corner portions 18a and 18b. It differs from that of the first embodiment shown in FIG. 4 in that it is made of a low-rigidity resin material.

  The bottom center portion 24 a extends in a longitudinal direction in the longitudinal direction while continuing in the longitudinal direction of the core member 12 so as to straddle each bone piece 13 and the connecting portion 24. The bottom center portion 24a has a thickness that is about half of the thickness of the bottom portion 16 and the connecting portion 24 in each bone piece 13, and is located on the outer surface side of the bottom portion 16 and the connecting portion 24 in each bone piece 13. Exposed in a flush state.

  In addition, as described above, the bottom center portion 24a is a low-rigidity resin material having a lower rigidity than the general portion of the core material 12 excluding the bottom center portion 24a and the corner portions 18a and 18b. Then, it is made of polypropylene which is a hard olefin-based thermoplastic resin, and its bending elastic modulus is set in a range of 1000 to 1900 MPa.

  Here, the material of the bottom center portion 24a is not limited to the polypropylene, and polyethylene or the like, which is the same olefin-based thermoplastic resin, can be used. Depending on the required flexural modulus, the first first Similarly to the embodiment, a reinforcing material such as talc can be contained. Further, the bottom center portion 24a can be formed of a foamed resin material together with the general portion of the core material 12 excluding the corner portions 18a and 18b. In this case, it is preferable in terms of weight reduction. .

  Therefore, according to the second embodiment, the bottom center portion 24a is made of a low-rigidity resin having low rigidity compared to the general portion of the core 12 excluding the bottom center portion 24a and the corner portions 18a and 18b. Since it is made of a material, it is particularly possible to ensure the ease of bending or the ease of bending of the bottom portion 16 and the connecting portion 24 of each bone fragment 13. Therefore, as compared with the first embodiment, it is much easier to bend the weather strip 3 with the opening 4a side of the mounting base 4 in the weather strip 3 being the outside and the bottom wall 10 side being the inside. It becomes possible to faithfully follow the curvature of the flange portion 2 on the other side.

  FIG. 7 shows a modification of the second embodiment shown in FIG. 6, and parts common to those in FIG. 6 are denoted by the same reference numerals.

  In this modified example, as is clear when comparing FIG. 6 and FIG. 7, the bottom center portion 24 a of FIG. 7 is not exposed on the outer surface of the bottom portion 16 and the connecting portion 24 of each bone fragment 13. 6 is different from that of FIG. 6 in that it is completely embedded in the bottom portion 16 and the connecting portion 24.

  Needless to say, this modification can provide the same effects as those of the second embodiment shown in FIG.

3 ... Weather strip 4 ... Mounting base 5 ... Hollow seal lip (seal part)
9a ... Side wall part 9b ... Side wall part 10 ... Bottom wall part 12 ... Core material 13 ... Bone fragment 14 ... Connection part 15a ... Leg part (a side wall part equivalent part)
15b ... Leg part (corresponding to side wall part)
16 ... bottom (corresponding to the bottom wall)
18a ... corner section 18b ... corner section 24 ... connecting part

Claims (7)

A mounting base formed in a substantially U-shaped cross section with a pair of side walls facing each other and a bottom wall connecting the side walls, and a seal part formed integrally with a part of the mounting base And comprising
A weather strip in which a resin core material having a similar shape to the mounting base is embedded in the mounting base,
The core material is a connecting portion that interposes a plurality of pieces of bone pieces having a substantially U-shaped cross-section arranged side by side at a predetermined pitch in the longitudinal direction between portions corresponding to the bottom wall portions of the bone pieces. Connected to each other,
The corner portion formed by the side wall portion and the bottom wall portion of each bone fragment is formed of a highly rigid resin material having higher rigidity than the other portions of the core excluding the corner portion of the bone fragment. Weather strips that are characterized by being. A low-rigidity resin material having a rigidity lower than that of the other part of the core excluding the central part in the width direction and the corner part of the bone fragment at the width direction central part of the core wall corresponding part. The weather strip according to claim 1, wherein the weather strip is formed by: Other widthwise central portion of the widthwise central portion of the bottom wall corresponding part and the connecting part of the upper Symbol respective bone fragment, core material excluding the corner portion of the widthwise central portion and the bone pieces of both The weather strip according to claim 2 , wherein the weather strip is made of a low- rigidity resin material having a lower rigidity than that of the portion . The weather strip according to claim 3, wherein the high-rigidity resin material has a flexural modulus of 5,000 to 7,000 MPa . The weather strip according to claim 4 , wherein the low- rigidity resin material has a flexural modulus of 1,000 to 1,900 MPa. The bending elastic modulus of the other part of the core material excluding both the widthwise center part and the corner part of the bone fragment is 2,000 to 4,000 MPa. Weather strip. The weather strip according to any one of claims 1 to 6, wherein the core material is formed of a foamed resin material except for a corner portion of a bone fragment .

Images