Glass run

Abstract

To provide a glass run that can prevent occurrence of camber phenomenon thereof after extrusion molding while suppressing increase in a glass run weight and increases in material and molding cost.SOLUTION: A glass run comprises: a bottom wall 21; a vehicle inner side wall 22 and a vehicle outer side wall 23 which are provided at both end edges in a width direction of the bottom wall respectively; and a plurality of outer and inner holding lips 25, 26, 30, 31 which are respectively provided on opposite inner faces of the vehicle inner side wall and the vehicle outer side wall, contact both side faces of a door glass and hold the same. A cross-sectional area of the vehicle outer side wall is so made as to be smaller than a cross-sectional area of the vehicle inner side wall, and a ratio of cross sectional areas of a basic section 22a of the vehicle inner side wall and a basic section 23a of the vehicle outer side wall is set to 10:3 or more and at least 10:5 or less.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a glass run that is attached to the inner periphery of a sash portion of a door that opens and closes an opening in the body of an automobile, and that guides the sliding of the door glass. [Background technology]

[0002] BACKGROUND ART A glass run held on the inner periphery of a sash portion of an automobile door is known from Patent Document 1 below.

[0003] FIG. 1 is a side view of the left front door of an automobile, FIG. 2 is a simplified front view of only the glass run as seen from outside the vehicle, FIG. 6 is a cross-sectional view taken along line AA in FIG. 1 showing a conventional glass run, and FIG. 7 is a plan view showing the state of the conventional glass run after it has been deflected and deformed after extrusion molding.

[0004] As shown in Figure 1, the left front door 1, which is formed as a press door for an automobile, is provided with a sash portion 3, which has a substantially U-shaped cross section and is formed by roll forming at the upper end of the door body 2. A window opening is formed by this sash portion 3 and the upper edge of the door body 2, and a glass run 5, which guides the door glass 4 as it moves up and down, is attached to the inner peripheral edge of this window opening and inside the door body 2. The right front door and the left and right rear doors are also equipped with the same glass runs.

[0005] 2, the glass run 5 is made up of a first extrusion molding portion 5a corresponding to the horizontal frame portion of the sash portion 3, a second extrusion molding portion 5b corresponding to the front vertical frame portion of the front door 1, and a third extrusion molding portion 5c corresponding to the rear vertical frame portion. The front end of the first extrusion molding portion 5a and the upper end of the second extrusion molding portion 5b are joined by a first mold molding portion 5d, and the rear end of the first extrusion molding portion 5a and the upper end of the third extrusion molding portion 5c are joined by a second mold molding portion 5e.

[0006] Of the extrusions, the following will describe only the first extrusion 5c for ease of explanation. As shown in Fig. 6, the glass run 5c has a bottom wall 7 held by a reinforcement bracket (retainer) 6 formed by a panel of the sash 3 of the front door 1, and an interior side wall 8 and an exterior side wall 9 provided at both ends of the bottom wall 7 in the width direction.

[0007] The interior side wall 8 has a first inner retaining lip 10a and a second inner retaining lip 10b provided on the end opposite the bottom wall 7 and the inner surface 8a thereof, which are inclined toward the inner surface 9a of the opposing exterior side wall 9. On the other hand, the exterior side wall 9 has a first outer retaining lip 11a and a second outer retaining lip 11b provided on the end opposite the bottom wall 7, which are inclined toward the inner surface 8a of the interior side wall 8. The tips of these retaining lips 10a, 10b, 11a, 11b are in sandwiched contact with both side surfaces 4a, 4b of the door glass 4 during lifting and lowering, thereby stably guiding the door glass 4 to slide. A cover lip 10c is provided on the interior side wall 8 at a position opposite the first inner retaining lip 10a, to seal the gap with the inner end 6a of the retainer 6.

[0008] This glass run 5c is formed so that the cross-sectional area of ​​the outer side wall 9 is smaller (thinner) than the cross-sectional area of ​​the inner side wall 8, since the door glass 4 is positioned offset toward the outside of the vehicle due to requirements such as vehicle body design. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Patent Publication No. 2021-24388 Summary of the Invention [Problem to be solved by the invention]

[0010] However, as described above, the cross-sectional area of ​​the exterior side wall 9 is smaller than that of the interior side wall 8. However, if the ratio of the cross-sectional areas of the interior side wall 8 and the exterior side wall 9 is set to less than 10:3, the difference in shrinkage between the materials of both side walls 8, 9 may cause the entire glass run 5c to bend and deform after extrusion molding, as shown in FIG. 7. In other words, there is a risk of the thin exterior side wall 9 extending in the longitudinal direction and the interior side wall 8 being significantly bent and deformed so as to be recessed, resulting in so-called camber. Hereinafter, the bending deformation of the glass run 5c after extrusion molding will be referred to as camber.

[0011] If this camber occurs, it can cause inconveniences such as not being able to obtain the intended length when cutting the end of the extrusion molded product during the manufacturing process of the glass run 5c, or making it difficult to attach the glass run 5c to the retainer 6 of the sash part 3.

[0012] Therefore, it has been considered to suppress the camber after extrusion molding by embedding linear metal wires in the interior side wall 8 and the exterior side wall 9 along the longitudinal direction.

[0013] However, burying metal wires inside the vehicle interior side wall 8 and the vehicle exterior side wall 9 increases the weight of the glass run 5 as a whole, and there is a risk that material costs and molding costs will increase.

[0014] In the above explanation, the extrusion-molded glass run 5 on the left front door 1 side has been described, but the same technical problems arise in the glass runs on the right front door and the left and right rear doors.

[0015] The present invention has been devised in view of the technical problems with the conventional glass runs, and aims to provide a glass run that can prevent the occurrence of camber, which is bending deformation of the glass run after extrusion molding, while suppressing an increase in the weight of the glass run and an increase in material and molding costs. [Means for solving the problem]

[0016] The invention described in claim 1 of the present application is characterized in that it comprises a bottom wall, an interior side wall and an exterior side wall provided at both widthwise end edges of the bottom wall, and a plurality of retaining lips provided on opposing inner surfaces of the interior side wall and the exterior side wall, which abut against and retain both sides of the door glass, wherein the cross-sectional area of ​​the exterior side wall is smaller than the cross-sectional area of ​​the interior side wall, and the ratio of the cross-sectional areas of the interior side wall to the exterior side wall is set in the range of 10:3 or more and at least 10:5 or less. [Effects of the Invention]

[0017] According to the invention described in claim 1 of the present application, by setting the ratio of the cross-sectional areas of the vehicle interior side wall and the vehicle exterior side wall of the glass run to be 10:3 or more, it is possible to effectively prevent the occurrence of camber after extrusion molding while suppressing an increase in the weight of the entire glass run and an increase in material costs and molding costs. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a side view of the left front door of a vehicle. [Figure 2] FIG. 2 is a simplified front view of only the glass run as viewed from outside the vehicle. [Figure 3] 2 is a cross-sectional view taken along line AA in FIG. 1, showing a first embodiment of the glass run according to the present invention. FIG. [Figure 4] This table shows experimental results verifying whether or not camber occurs when the ratio of the cross-sectional area of ​​the inside side wall of the glass run to the cross-sectional area of ​​the outside side wall is changed. [Figure 5] 2 is a cross-sectional view taken along line AA in FIG. 1, showing a second embodiment of the glass run according to the present invention. FIG. [Figure 6] FIG. 2 is a cross-sectional view taken along line AA in FIG. 1 showing a conventional glass run. [Figure 7] FIG. 1 is a plan view showing a state in which a conventional glass run is deflected and deformed after extrusion molding. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A glass run according to an embodiment of the present invention will now be described in detail with reference to the accompanying drawings. In this embodiment, a glass run is shown as being attached to a sash portion of a front door of a pressed door of an automobile.

[0020] FIG. 3 is a cross-sectional view taken along line AA in FIG. 1, showing a first embodiment of a glass run according to the present invention, and FIG. 4 is a table showing experimental results verifying whether or not camber occurs when the ratio of the cross-sectional areas of the inside side wall and the outside side wall of the glass run is changed.

[0021] The glass run 20 according to the first embodiment is integrally formed in the longitudinal direction by extrusion molding and is formed from a dynamically crosslinked thermoplastic elastomer (TPV) to have a substantially U-shaped (channel-shaped) cross section. As shown in Fig. 3, the glass run 20 has a flat bottom wall 21 and an interior side wall 22 and an exterior side wall 23 connected to both widthwise ends of the bottom wall 21.

[0022] The bottom wall 21 is made of a slightly soft foamed TPV with a hardness of approximately 70 degrees, and has a sliding member 21a formed on its inner surface to improve sliding. In addition, a pair of grooves 24a, 24b are formed on the inside of the connection points between both widthwise ends of the bottom wall 21 and the interior side wall 22 and the exterior side wall 23, allowing the interior side wall 22 and the exterior side wall 23 to freely deploy.

[0023] The outer side wall 23 has two first and second outer retaining lips 25, 26 integrally formed at its tip located on the opposite side of the bottom wall 21 in the width direction, and the length range from the joint 23b with the bottom wall 21 (bottom wall side notch portion 24b) to the joint 23c with the first and second outer retaining lips 25, 26 is configured as the basic portion 23a.

[0024] The basic portion 23a is made of a slightly soft foamed TPV material with a hardness of approximately 70 degrees, and is relatively thin, with an overall thickness W of approximately 1.3 mm and a width L of approximately 15.8 mm.

[0025] The first and second outer retaining lips 25, 26, including the base end 25a joined to the joining portion 23c with the base portion 23a, are made of a TPV having a hardness of approximately 80 degrees, and are made of a slightly harder material than the base portion 23a. In addition, the first and second outer retaining lips 25, 26 protrude at an angle toward the inner surface of the interior side wall 22 in a free state where they are not in contact with the one side 4a of the door glass 4. Furthermore, the first and second outer retaining lips 25, 26 are formed on the inner surface of the base end 25a with a first notch portion 27, which is a thin portion that allows the first and second outer retaining lips 25, 26 to lean toward the inner surface of the exterior side wall 23 due to the pressing force transmitted from the one side 5a of the door glass 4 when the door is raised or lowered. In addition, the exterior side wall 23 is provided with a first retaining protrusion 28 near the connection with the bottom wall 21 on the outer surface, which is fitted and held within the retainer 6 of the sash portion 3, and a second retaining protrusion 29 is provided on the outer surface of the base end portion 25a, which is fitted and held at the tip end portion 6a of one side wall that is bent back in the shape of a fold of the retainer 6.

[0026] As shown in Figure 3, the interior side wall 22 has two first and second inner retaining lips 30, 31 integrally formed at the tip located on the opposite side of the width direction from the bottom wall 21 and at a predetermined position on the inner surface, and the length range from the joint 22b with the bottom wall 21 (bottom wall side notch portion 24a) to the joint 22c with the first inner retaining lip 30 is configured as the basic portion 22a.

[0027] The first and second inner retaining lips 30, 31 are formed to protrude linearly, and in a free state where they are not in contact with the other side surface 4a of the door glass 4, they protrude in an inclined manner upward toward the inner surface of the outer side wall 23 toward the bottom wall 21.

[0028] The first inner retaining lip 30 has a convex base end 30a connected to the connecting portion 22c of the basic portion 22a, and on the inner surface thereof, a second notch portion 32 is formed which allows the interior side wall 22 to collapse inward due to the pressing force transmitted from one side surface 4a of the door glass 4 when the door glass 4 is raised or lowered.

[0029] The second inner retaining lip 31 has a convex base end 31a, which is the joint with the basic portion 22a, and a third notch 33 formed therein to allow the second inner retaining lip 31 to collapse toward the interior side wall 22 due to the pressing force transmitted from the other side surface 4b of the door glass 4 when the door glass 4 is raised or lowered. As shown by the two-dot chain line in Figure 3, when the first inner retaining lip 30 and the second inner retaining lip 31 collapse to the maximum extent toward the interior side wall 22 via the notch 32, 33, the convex base ends 30a, 31a come into contact with the retaining lips 30, 31 to prevent excessive collapse.

[0030] A third retaining projection 34 is provided at a position opposite the first inner retaining lip 30. This third retaining projection 34 is adapted to be held by elastic contact with an engaging portion 6b bent into a substantially L-shape on the other side wall of the retainer 6 opposite the one side wall. Furthermore, the interior side wall 22 is provided with a fourth retaining projection 37 at a substantially central position on the outer surface that elastically contacts the inner surface of the recessed fitting portion 6c of the retainer 6, and is also provided with a seal lip 38 on the outer surface near a joining portion 22b with the bottom wall 21 that elastically contacts the inner surface of the retainer 6.

[0031] In addition, the first inner retaining lip 30 and the second inner retaining lip 31, including the base end portion 30a, are made of a hard TPV material with a hardness of 80 degrees, and the third retaining protrusion 34, the fourth retaining protrusion 37, and the seal lip 38 are also made of TPV with the same hardness.

[0032] The widthwise length L between the two joints 23b, 23c of the basic portion 23a of the vehicle exterior side wall 23 is formed to be slightly longer than the widthwise length L1 between the two joints 22b, 22c of the basic portion 22a of the vehicle interior side wall 22.

[0033] The basic portion 22a is made of the same material as the basic portion 23a of the vehicle exterior side wall 23, a slightly soft foamed TPV with a hardness of approximately 70 degrees, and has two first and second thin-walled portions 35, 36 formed by cutting out two places on the inner surface excluding the base ends 30a, 31a of the first and second inner retaining lips 30, 31, and the thickness width W1 of each of these thin-walled portions 35, 36 is set to approximately 2.3 mm.

[0034] In this embodiment, the ratio of the cross-sectional area of ​​the thickness width W1 of the basic portion 22a of the interior side wall 22 to the thickness width W of the basic portion 23a of the exterior side wall 23 is set to be equal to or greater than 10:3 and at least 10:5. The setting of this ratio of the cross-sectional areas of the two portions 22a and 23a was determined from the following experimental results by the inventors of the present application.

[0035] FIG. 4 is a table showing the results of an experiment conducted by the inventor of the present application to verify whether or not camber occurs by changing the cross-sectional area ratio between the basic portion 22a of the vehicle-interior side wall 22 and the basic portion 23a of the vehicle-exterior side wall 23.

[0036] In this experiment, the cross-sectional area ratio of each basic portion 22a, 23a of both side walls 22, 23 was divided into seven ratios for verification: (1) 10:2, (2) 10:2.5, (3) 10:2.9, (4) 10:3, (5) 10:3.8, (6) 10:4, and (7) 10:5. In the figure, × indicates that camber occurred, △ indicates that slight camber occurred, and ◯ indicates that no camber occurred.

[0037] The results of this experiment showed that with the cross-sectional area ratios of (1) and (2), the outer side wall 23 stretched and the inner side wall 22 deformed concavely after extrusion, just like the conventional glass run described in the publication above, meaning that the entire glass run 20 was deflected (warped) and camber was generated.With the cross-sectional area ratio of (3), it was found that a small amount of camber was generated after extrusion, causing the entire glass run 20 to warp gently.

[0038] On the other hand, when the cross-sectional area ratio of (4) to (7) is 10:3 or more and at least 10:5 or less, that is, when the cross-sectional area ratio of both side walls 22, 23 is reduced, it has been found that the glass run molded product after extrusion molding has almost no camber and remains straight.

[0039] However, in the above experiment, the ratio of the cross-sectional areas of the side walls 22, 23 was only set to 10:5 as in (7). However, if the ratio of the cross-sectional areas is set to more than 10:5, for example, close to 10:10, that is, even if the ratio of the cross-sectional areas is further reduced, it is thought that no camber will occur in the glass run 20.

[0040] Therefore, in this embodiment, the cross-sectional area ratio of the thickness width W1 of the basic portion 22a of the interior side wall 22 to the thickness width W of the basic portion 23a of the exterior side wall 23 is set to (4) 10:3 or more and at least 10:5 or less. As a result, it is possible to sufficiently suppress the occurrence of camber in the glass run 20 after extrusion molding.

[0041] In addition, in this embodiment, the widthwise length L of the basic portion 23a of the vehicle exterior side wall 23 is made slightly longer than the widthwise length L1 of the basic portion 22a of the vehicle interior side wall 22, thereby increasing the rigidity of the vehicle exterior side wall 23, which also makes it possible to further suppress the occurrence of camber in the glass run molded product after extrusion molding.

[0042] Furthermore, in this embodiment, unlike the conventional glass runs, there is no need to provide metal wires inside the vehicle interior side wall 22 or the vehicle exterior side wall 23 to suppress the occurrence of camber, so that an increase in the weight of the glass run 20 and an increase in material and molding costs can be suppressed. Second Embodiment FIG. 5 shows a second embodiment of the glass run according to the present invention. The basic configuration is the same as that of the first embodiment, but the main difference is that the notches formed in the base ends 25a, 30a, and 31a of the inner and outer retaining lips 25, 30, and 31 have been eliminated.

[0043] That is, the vehicle exterior side wall 23 and the vehicle interior side wall 22 have no notches at the base ends 25a, 30a, 31a of the first outer retaining lip 25 and the first and second inner retaining lips 30, 31, and are formed flat. Also, a plurality of wave-shaped protrusions 40, 41 are provided on the opposing inner surfaces of the respective basic portions 22a, 23a along the longitudinal direction of the glass run 20. These protrusions 40, 41 are intended to facilitate separation from the inner surfaces of the side walls 22, 23 when the outer and inner retaining lips 26, 30, 31 are tilted to their maximum extent toward the inner surfaces of the side walls 22, 23 due to the reaction force of the door glass 4 and come into contact with the inner surfaces.

[0044] Incidentally, the thickness width W of the basic portion 23a of the exterior side wall 23 is set to 1.3 mm, whereas the thickness width W1 of the basic portion 22a of the interior side wall 22 is set to 3.3 mm. Therefore, the configuration in which the cross-sectional area ratio between the basic portion 22a of the interior side wall 22 and the basic portion 23a of the exterior side wall 23 is 10:3 or more and at least 10:5 or less is the same as in the first embodiment.

[0045] Therefore, as in the first embodiment, it is possible to suppress the occurrence of camber in the glass run after extrusion molding, and also to suppress increases in weight and material and molding costs.

[0046] The present invention is not limited to the configuration of the above embodiment, and for example, the cross-sectional shape of the glass run 20, i.e., the cross-sectional shapes of the bottom wall 21 and the lengths of the inside and outside side walls 22, 23 of the vehicle, can be changed as desired depending on the shape and size of the vehicle body. [Explanation of symbols]

[0047] 1...Front door 2...Door body 3...Sash section 4...Door glass 4a·4b…Both sides 5...Conventional glass run 6...Retainer 20...Glass run of this embodiment 21...Bottom wall 22...Inside wall of the car 22a…Basic parts 22b·22c…Joining part 23...Outside side wall of the vehicle 23a…Basic parts 23b·23c…Joining part 25...First outer retaining lip 26...Second outer retaining lip 27...First notch 30...First inner retaining lip 31...Second inner retaining lip 32...Second notch 33...Third notch 35·36...1st and 2nd thin section 40·41…Convex part W: Wall thickness of the basic part of the outer side wall of the vehicle W1: Wall thickness of the basic part of the side wall inside the vehicle

Claims

1. a bottom wall; an interior side wall and an exterior side wall provided at both widthwise end edges of the bottom wall; and a plurality of retaining lips provided on opposing inner surfaces of the interior side wall and the exterior side wall, which abut against and retain both side surfaces of the door glass, The cross-sectional area of ​​the vehicle exterior side wall is formed smaller than the cross-sectional area of ​​the vehicle interior side wall, and the ratio of the cross-sectional areas of the vehicle interior side wall to the vehicle exterior side wall is set in a range of 10:3 or more and at least 10:5 or less.

2. The glass run according to claim 1, a thin-walled portion formed by removing an inner surface of the vehicle interior side wall except for a portion where the side wall is joined to the retaining lip, and a ratio of a cross-sectional area of ​​the thin-walled portion to a cross-sectional area of ​​the vehicle exterior side wall is set to a range of 10:3 or more and at least 10:5 or less.

3. The glass run according to claim 1, the first retaining lip of the vehicle-interior side wall and the first retaining lip of the vehicle-exterior side wall are provided at ends of the side walls opposite to the bottom wall, the vehicle interior side wall and the vehicle exterior side wall each have a basic portion provided along the width direction from both widthwise end edges of the bottom wall to a base end portion of each of the first retaining lips, A glass run characterized in that a basic portion of a vehicle exterior side wall is formed longer than a basic portion of the vehicle interior side wall.

4. The glass run according to claim 1, a notch portion is provided at a base end portion of the retaining lip connected to the vehicle interior side wall, the notch portion allowing the retaining lip to bend and deform when the door glass is raised; a thin-walled portion is formed by removing a portion of the inner surface of the vehicle interior side wall excluding a base end portion of the retaining lip, and the ratio of the cross-sectional area of ​​the thin-walled portion to the cross-sectional area of ​​the vehicle exterior side wall is set to 10:3 or more and at least 10:5 or less.

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