JP2011011602A - Automobile weather strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automobile weather strip improving sealing properties and sound insulation performance, while achieving lightweight by employing a material having a relatively low specific gravity.SOLUTION: A hollow main seal lip 12 is formed as a two-layer structure made up of an outer layer 12a composed of a low specific gravity material, and an inner layer 12b composed of a high specific gravity material having a higher specific gravity than the low specific gravity material. In peripheral wall sections 14 and 15 on the interior side and the exterior side, respectively, which rise from an attachment base 10 in the main seal lip 12, a thickness T1 of the inner layer 12b is set larger than a thickness T2 of the inner layer 12b at an annular top wall section 16 extending over both of the peripheral wall sections 14 and 15.

Description

  The present invention relates to a weather strip for an automobile that is mounted on a peripheral portion of an automobile door.

  Foam is used as a material for this kind of automobile weather strip, but recently, the use of a foam having a high foaming ratio and a low specific gravity has been studied mainly for weight reduction. However, since such a material is relatively soft, if the material is simply applied to a weather strip for an automobile, there is a problem in that sound insulation performance is lowered and a necessary lip reaction force cannot be secured.

  Therefore, for example, as described in Patent Document 1, the hollow seal portion of the weather strip is a portion between the indoor root portion and the elastic contact point with respect to the mating member, and is elastic to the mating member. A structure in which a non-contact portion is constituted by a hard foam having a lower foaming ratio than other portions has been proposed.

Japanese Patent Laid-Open No. 10-236163

  In the technique described in Patent Document 1, the boundary between the portion formed of the hard foam and the other portion of the hollow seal portion is exposed to the outside, and the color gloss changes at the boundary. Unfavorable in terms of In addition, since the degree of hardness is significantly different between the part formed of the hard foam and the other part of the hollow seal part, the hollow seal part is bent and deformed by contact with the mating member. When this occurs, wrinkles occur at the boundary portion between the portion formed of the hard foam and other portions of the hollow seal portion, and there is a possibility that the sealing performance and sound insulation performance may be impaired by the wrinkles. .

  The present invention has been made in view of such problems, and mainly an automobile capable of improving sealing performance and sound insulation performance while reducing weight by adopting a material having a relatively low specific gravity. The purpose is to provide a weatherstrip.

  The invention according to claim 1 is provided with a mounting base portion that is attached to the peripheral edge portion of the door for an automobile, and a hollow seal lip that is integrally protruded from the mounting base portion. A weather strip for an automobile which is sealed by being brought into pressure contact with a sealing surface which is a side, wherein the sealing lip includes a peripheral wall portion on the indoor side and an outdoor side which rises toward the sealing surface side which is a mating side. An outer layer made of a low specific gravity material, and an inner layer made of a high specific gravity material having a specific gravity greater than that of the low specific gravity material. In addition, the inner layer thickness of the inner peripheral layer of each of the indoor and outdoor peripheral wall portions of the seal lip is changed to the inner layer thickness. It is characterized in that is set larger than the.

  Specifically, for example, as in the invention described in claim 2, the seal lip has a substantially oval cross-sectional shape and is integrally projected from the mounting base with the major axis direction as a projecting direction, and When the door is closed, it is deformed by bending from the root of the seal lip in the minor axis direction with a pressure contact with the mating seal surface. When the door is closed, the arc-shaped peripheral wall is pressed against the mating seal surface. On the other hand, it is preferable that both the peripheral wall portions are set so as not to be in pressure contact with the mating seal surface, and the outer peripheral wall portion is set so as to be substantially parallel to the mating seal surface when the door is closed.

  In other words, at least in the invention according to claim 1, sound insulation and rigidity can be achieved by making the wall thickness of the inner layer made of the high specific gravity material larger than the wall thickness at the other part at the respective peripheral walls on the indoor side and the outdoor side. On the other hand, in other parts, the thickness of the inner layer made of a high specific gravity material is made relatively small so as to be flexible or easily deformable. When the door is closed, the both peripheral wall portions act so as to press a portion of the seal lip having a small thickness of the inner layer against the sealing surface on the other side by a restoring force based on the bending deformation, while the seal lip The portion of the inner layer having a small thickness is intimately pressed against the seal surface with a relatively soft outer layer while deforming flexibly following the seal surface. Note that the outer surface of the seal lip is entirely composed of a low specific gravity material, so the appearance quality is not impaired.

  More specifically, considering the balance between hardness and weight as the material of the outer layer and the inner layer, the low specific gravity material forming the outer layer has a specific gravity of 0 as in the invention of claim 3. It is preferable that the high specific gravity material forming the inner layer is a foam having a specific gravity of 0.65 to 0.9.

  In addition, as the thickness of the inner layer of each of the seal lips on the inner wall side and the outer wall portion on the indoor side, as in the invention according to claim 4, the total wall thickness is secured in order to secure a necessary lip reaction force. It is desirable to set it to 50% or more of the thickness, and it is desirable to set it to 80% or less of the total thickness in order to prevent the high specific gravity material from being exposed to the outside.

  Furthermore, as the thickness of the inner layer in the other portion of the seal lip excluding the peripheral wall portions on the indoor side and the outdoor side, the degree of flexibility or ease of deformation is taken into account. It is desirable to set it to 20 to 40% of the total wall thickness as in the invention.

  On the other hand, at the portion where the thickness of the inner layer changes, in order to prevent the occurrence of bending or wrinkles when the door is closed, as in the invention of claim 6, the thickness gradually changes from one thickness to the other. It is desirable to form a gradually changing thickness portion, and, as in the invention described in claim 7, in the portion where the inner layer thickness is large, the ratio of the thickness to the portion where the inner layer thickness is small is 3 or less. It is more desirable that the degree of change in wall thickness is set to be relatively small.

  On the other hand, when sound insulation is particularly important, the inner layer extends from the outer peripheral wall portion of the seal lip to at least a part of the arcuate top wall portion of the seal lip. A portion having a large thickness may be formed.

  According to the present invention, the thickness of the inner layer, which is relatively hard and excellent in sound insulation, is set to be larger than the other portions in the both peripheral wall portions, thereby reducing the weight by using a low specific gravity material. In addition, the sealing property and the sound insulation property can be improved.

  In particular, according to the inventions of the sixth and seventh aspects, in the portion where the thickness of the inner layer changes, the occurrence of bending and wrinkles when the door is closed is more effectively prevented, and the sealing performance and sound insulation performance are further improved. There is a merit that can be made.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the 1st Embodiment of this invention, Comprising: The side view of the motor vehicle equipped with the weather strip for motor vehicles based on this invention. It is AA sectional drawing of FIG. 1, Comprising: The figure which shows a door open state. It is AA sectional drawing of FIG. 1, Comprising: The figure which shows a door closed state. The graph which compared the bending load characteristic in the 1st Embodiment of this invention with Comparative Examples 1-3. It is explanatory drawing of Comparative Examples 1-3, Comprising: Sectional drawing corresponded in the AA cross section of FIG. The graph which compared the sound insulation characteristic in the 1st Embodiment of this invention with the comparative example 1. FIG. It is a figure which shows the 2nd Embodiment of this invention, Comprising: Sectional drawing of the door open state corresponded to the AA cross section of FIG. It is a figure which shows the 2nd Embodiment of this invention, Comprising: Sectional drawing of a door closed state equivalent to the AA cross section of FIG. It is a figure which shows the 3rd Embodiment of this invention, Comprising: Sectional drawing of the door open state equivalent to the AA cross section of FIG. It is a figure which shows the 3rd Embodiment of this invention, Comprising: Sectional drawing of the door closed state equivalent to the AA cross section of FIG.

  FIGS. 1 to 3 are views showing a first preferred embodiment of the present invention. FIG. 1 is a side view of an automobile equipped with an automotive weather strip according to the present invention, and FIG. It is A sectional drawing, and is a figure which shows a door open state, FIG. 3 is AA sectional drawing in FIG. 1, Comprising: It is a figure which shows a door closed state. 2 and 3 indicate the door closing direction.

  As shown in FIGS. 1 and 2, a front door 1 that is a door for an automobile is composed of a door body 2 that houses a window regulator (not shown) and a door sash 3 that has a substantially arch shape in side view. A closed-loop weather strip 6 is attached to the peripheral portion of the front door 1 including the main body 2 and the door sash 3. The weather strip 6 seals between the front door 1 and the door opening edge 5 on the vehicle body 4 side.

  A groove shape for fitting and holding a later-described sub seal portion 7 of the weather strip 6 is formed on the outer peripheral surface of the door sash 3 that faces the door opening edge portion 5 on the vehicle body 4 side when the door is closed. A first retainer portion 3a is formed in the width direction of the door sash 3 on the vehicle interior side of the first retainer portion 3a, and has a groove shape for fitting and holding a main seal portion 8 to be described later in the weather strip 6. 2 retainer portions 3b are formed. Both the retainer parts 3a and 3b are set so as to have a step difference in the vertical direction, and between the retainer parts 3a and 3b of the door sash 3, the width of the door sash 3 is extended toward the outside of the passenger compartment. An inclined surface 3c inclined upward is formed.

  On the other hand, on the door opening edge 5 on the vehicle body 4 side, a first seal surface 5a, which will be described later, contacts a sub seal portion 7 of the weather strip 6 when the door is closed, and a passenger compartment of the first seal surface 5a. A step-like second seal surface 5b is formed, which is bent from the inner edge to the door sash 3 side, and a main seal portion 8 to be described later of the weather strip 6 comes into elastic contact when the door is closed. .

  On the other hand, the weather strip 6 is formed by extrusion molding into a substantially uniform cross-sectional shape in the longitudinal direction on the basis of the cross-sectional shape shown in FIG. 2, and is represented by a foam of a resin material represented by TPO or EPDM. It is formed by a foam of rubber material. The weather strip 6 is held by the main seal portion 8 held by the second retainer portion 3b on the door sash 3 side as described above and the first retainer portion 3a by the door sash 3 side as described above. The sub seal part 7 is provided, and both the seal parts 7 and 8 are integrally connected by a bridge part 9 extending along the inclined surface 3c on the door sash 3 side.

  Both seal parts 7 and 8 are common in that they are configured around attachment base parts 10 and 11 fitted to the corresponding retainer parts 3a and 3b, respectively. While having a hollow main seal lip 12 formed to project integrally, the sub seal portion 7 has a tongue-like sub seal lip 13 formed to project obliquely from the mounting base 11 toward the outside of the passenger compartment. have. A seal bead 9 a that presses against the inclined surface 3 c of the door sash 3 is formed on the back surface of the root portion of the bridge portion 9 on the main seal portion 8 side.

  The main seal lip 12 has an oval or elliptical cross-sectional shape including a part of the mounting base 10 and is formed to project toward the second seal surface 5b on the vehicle body 4 side with the major axis direction as the projecting direction. Each of the peripheral wall portions 14 and 15 on the vehicle exterior side and the vehicle interior side rising from the mounting base 10 toward the second seal surface 5b, and the arcuate top wall portion straddling both the peripheral wall portions 14 and 15 16.

  In addition, the main seal lip 12 has an outer layer 12a made of a low specific gravity material having a relatively high foaming rate as a whole, and a lower foaming rate than the low specific gravity material. It is formed as a two-layer structure with an inner layer 12b made of a high specific gravity material having a specific gravity set larger than that of the specific gravity material. In other words, the outer surface of the main seal lip 12 is formed with the outer layer 12a, while the inner surface of the main seal lip 12 is formed with the inner layer 12b, so that the inner layer 12b is not exposed to the outside. The inner layer 12b and the outer layer 12a of the main seal lip 12 are extruded simultaneously with other portions of the weather strip 6 by a so-called double extrusion molding method, and the portions of the weather strip 6 excluding the main seal lip 12 are formed. That is, the sub seal part 7 and the bridge part 9 in addition to the mounting base part 10 in the main seal part 8 are formed of the same low specific gravity material as the outer layer 12 a of the main seal lip 12.

  More specifically, in consideration of the balance between the degree of hardness and weight, the outer layer 12a is formed by using a foam having a relatively high foaming ratio with a specific gravity of 0.2 to 0.5 as a low specific gravity material, The inner layer 12b is formed using a foam having a relatively low foaming ratio with a specific gravity of 0.65 to 0.9 as a high specific gravity material.

  The total thickness T of the main seal lip 12 including the inner layer 12b and the outer layer 12a is set to be substantially uniform over the entire main seal lip 12, and the total thickness T is the deflection of the main seal lip 12 when the door is closed. Considering the amount, it is set to 2 mm.

  Further, the thickness T1 of the inner layer 12b in both the peripheral wall portions 14 and 15 is set to be larger than the thickness T2 of the inner layer 12b in the arcuate top wall portion 16. Specifically, the thickness T1 of the inner layer 12b in the peripheral wall portions 14 and 15 is set in a range of 50 to 80% of the total thickness T, that is, in a range of 1 to 1.6 mm. Here, the thickness T1 of the inner layer 12b in the peripheral wall portions 14 and 15 is set in this way in order to ensure the predetermined rigidity and sound insulation in the peripheral wall portions 14 and 15. Is preferably 50% or more (1 mm or more) of the total thickness T, and in order to prevent the inner layer 12b from being exposed to the outside, the thickness T1 of the inner layer 12b is 80% or less of the total thickness T (1 This is because it is desirable that the thickness is 6 mm or less. On the other hand, the thickness T2 of the inner layer 12b in the arcuate top wall portion 16 is in the range of 20 to 40% of the total thickness, that is, 0. It is set in the range of 4 to 0.8 mm.

  In addition, it is desirable that the thickness T1 of the inner layer 12b in both the peripheral wall portions 14 and 15 is set so that the ratio of the inner layer 12b in the arcuate top wall portion 16 to the thickness T2 is 3 or less. This is because if the ratio of the wall thickness T1 to the wall thickness T2 exceeds 3, both the peripheral wall portions 14 and 15 and the arcuate top wall portion 16 are significantly different in degree of hardness and softness, and the main seal lip 12 is bent. This is because bending and wrinkles are likely to occur at the boundary between the two during deformation.

  Further, a portion of the main seal lip 12 where the thickness of the inner layer 12b changes, that is, a boundary portion between both the peripheral wall portions 14 and 15 and the arcuate top wall portion 16, is provided with an arcuate apex from both the peripheral wall portions 14 and 15 side. Thickness gradually changing portions 17 and 18 in which the thickness of the inner layer 12b gradually becomes thinner toward the wall portion 16 side are formed.

  Accordingly, the weather strip 6 configured as described above is sandwiched between the peripheral edge of the front door 1 and the door opening edge 5 on the vehicle body 4 side when the door is closed, and as shown in FIG. Of these, the sub seal lip 13 is bent and deformed from its root while being in pressure contact with the first seal surface 5a, while the main seal lip 12 of the weather strip 6 is in pressure contact with the second seal surface 5b while being short diameter direction from its root. Will bend and deform.

  Specifically, when the front door 1 is displaced in the door closing direction C from the door open state, the outer surface of the half of the arc-shaped top wall portion 16 of the main seal lip 12 on the vehicle interior side comes into contact with the second seal surface 5b. By the further closing operation of the front door 1, both the peripheral wall portions 14 and 15 are bent and deformed outward in the width direction of the door sash 3, while the arcuate top wall portion 16 flexibly follows the second seal surface 5 a. It will bend and deform. When the door is closed, the half of the arcuate top wall portion 16 on the vehicle interior side is pressed against the second seal surface 5b by the restoring force based on such deformation of the peripheral wall portions 14 and 15. become.

  In addition, when the door is closed, the peripheral wall portions 14 and 15 do not press against the second seal surface 5b, and the peripheral wall portion 15 on the outer side of the passenger compartment particularly takes a posture substantially parallel to the second seal surface 5b. become. Further, the outer half of the arcuate top wall portion 16 is formed on the outer half of the arcuate top wall portion 16 in pressure contact with the second seal surface 5b and the outer peripheral wall portion 15 on the outer side of the passenger compartment. In the meantime, the posture is substantially perpendicular to the second seal surface 5b. In addition, when the door is closed, the outer peripheral wall portion 15 outside the passenger compartment that has been bent and deformed does not come into contact with the bridge portion 9, and is not bent at the boundary between the peripheral wall portions 14, 15 and the arcuate top wall portion 16. No wrinkles occur.

  FIG. 4 is a graph showing the result of measuring the deflection load corresponding to the lip reaction force in the weather strip 6, and compares the results of Comparative Examples 1 to 3 described later with this embodiment. Note that the horizontal axis in FIG. 4 indicates an error in the installation of the front door 1 in the door closing direction C, and corresponds to the amount of bending of the weather strip 6. That is, the construction of the front door 1 in the direction in which the width dimension d narrows (door closing direction C) is set to 0 when the front door 1 is constructed without error and the width dimension d shown in FIG. The attachment error is shown as plus, and the installation error of the front door 1 in the direction in which the width direction d widens is shown as minus.

  The weather strip 19 in Comparative Examples 1 to 3 is common to the present embodiment in that it has a sub seal part 20, a main seal part 21, and a bridge part 22, as shown in FIG. The seal lip 23 is different from the present embodiment in that the seal lip 23 is configured with a single foam without having a two-layer structure. Of these, the comparative example 1 has the thickness T3 of the main seal lip 23 in the present embodiment. The overall weather strip 19 is formed of a foam having a specific gravity of 0.6. In Comparative Example 2, the thickness T3 of the main seal lip 23 is set to 2 mm, which is the same as that of the present embodiment, and the weather strip 19 is entirely formed of a foam having a specific gravity of 0.4 for weight reduction. It is a thing. Further, in Comparative Example 3, the entire weather strip 19 is formed with a foam having a specific gravity of 0.4, and the thickness T3 of the main seal lip 23 is set to 2.6 mm, which is thicker than that of the present embodiment. Is.

  As shown in FIG. 4, although the comparative example 1 shows a favorable deflection load characteristic, it is formed of a material having a specific gravity greater than that of the low specific gravity material constituting most of the weather strip 6 in the present embodiment. From the viewpoint of weight reduction, it is not preferable.

  Further, in Comparative Example 2, the weather strip is formed with a foam having a specific gravity substantially equal to that of the low specific gravity material constituting most of the weather strip 6 in the present embodiment. Since the material which comprises is comparatively soft, a bending load becomes remarkably low compared with the thing of the comparative example 1, and it is not preferable when ensuring sealing performance.

  Further, in Comparative Example 3, the thickness T3 of the main seal lip 23 is set to be thicker than that in Comparative Example 2, so that the deflection load can be increased as compared with Comparative Example 2, but particularly in the construction. When the error is 2 mm or more, the inner surface of the outer peripheral wall portion 25 of both the peripheral wall portions 24 and 25 comes into contact with the inner surface of the arcuate top wall portion 26 and the bending load becomes significantly larger than that of the comparative example 1. Therefore, it is not preferable in terms of door closing performance.

  For each of these comparative examples, in the weather strip 6 in the present embodiment, the weight of the weather strip 6 can be reduced by configuring most of the weather strip 6 with a low specific gravity material substantially the same as that of the comparative example 2. By setting the wall thickness T1 of the inner layer 12b in both the peripheral wall portions 14 and 15 that will particularly affect the bending load of the weather strip 6 to be relatively large, a bending load characteristic substantially equivalent to that of the comparative example 1 can be obtained. It was confirmed that it was obtained.

  In addition, the sound insulation effect of the weather strip 6 in the present embodiment is obtained by setting the wall thickness T1 of the inner layer 12b in both the peripheral wall portions 14 and 15 to be relatively large when the experimental results shown in FIG. Thus, it is clear that a high sound insulation property substantially equivalent to that of Comparative Example 1 can be obtained.

  Therefore, according to the present embodiment, the thickness T1 of the inner layer 12b, which is relatively hard and excellent in sound insulation, particularly affects both the lip reaction force and the sound insulation. In this case, by setting the thickness larger than the thickness T2 of the inner layer 12b in the arc-shaped peripheral wall portion 16, it is possible to improve sealing performance and sound insulation performance while reducing the weight by using a low specific gravity material.

  Further, by setting the wall thickness T2 of the inner layer 12b in the arcuate top wall portion 16 to be relatively small, the arcuate top wall portion 16 is flexibly deformed following the second seal surface 5b on the mating side when the door is closed. In addition to this, since the relatively soft outer layer 12a is in close pressure contact with the second seal surface 5b, there is an advantage that the sealing performance can be improved more effectively.

  Furthermore, the thickness T1 of the inner layer 12b in both the peripheral wall portions 14 and 15 is set so that the ratio of the inner layer 12b in the arc-shaped peripheral wall portion 16 to the thickness T2 is 3 or less, and By setting the wall thickness gradually changing portions 17 and 18 at the boundary portion with the arc-shaped peripheral wall portion 16, the boundary portion between both the peripheral wall portions 14 and 15 and the arc-shaped peripheral wall portion 16 whose degree of hardness is changed, There is an advantage that it is possible to effectively prevent bending and wrinkles when the door is closed and to further improve the sealing performance and sound insulation performance.

  In this embodiment, the inner layer 12b of the main seal lip 12 is formed using a foam of a rubber material or a resin material as a low specific gravity material. However, the main seal is formed by a non-foamed solid body made of a resin material or a rubber material. It is also possible to form the inner layer 12b of the lip 12.

  7 and 8 are diagrams showing a second embodiment of the present invention. 7 is a cross-sectional view corresponding to the AA cross section in FIG. 1, showing the door open state, and FIG. 8 is a cross-sectional view showing the door closed state of the cross section shown in FIG.

  The weather strip 27 of the second embodiment shown in FIGS. 7 and 8 has a two-layer structure in which the main seal lip 29 in the main seal portion 28 is composed of an outer layer 29a made of a low specific gravity material and an inner layer 29b made of a high specific gravity material. On the other hand, it is common to the above-described first embodiment, and a portion where the inner layer 29b is thick is continuous from the peripheral wall portion 31 on the outer side of the passenger compartment of both the peripheral wall portions 30 and 31. This is different from the first embodiment described above in that it extends to a part of the arcuate top wall portion 32. Specifically, the thickness of the inner layer 29b is the same as that of the peripheral wall portions 30, 31 in the outer half of the arcuate top wall portion 32 that does not contact the second seal surface 5b when the door is closed. Is set. Further, in the second embodiment, in order to prevent an excessive deflection load of the weather strip 27 when the door is closed, a boundary portion between the outer peripheral wall portion 31 and the arcuate top wall portion 32 is prevented. The bent portion 33 is formed with the curvature set larger than that of the first embodiment described above. Other parts are the same as those in the first embodiment described above.

  Therefore, in the second embodiment, the same effect as that of the first embodiment described above can be obtained, and the thick portion of the inner layer 29b is replaced with a portion of the arc-shaped top wall portion 32. By forming the part extending to the part, there is an advantage that the sound insulation can be further improved as compared with the first embodiment described above.

  FIG. 9.10 is a diagram showing a third embodiment of the present invention. 9 is a cross-sectional view corresponding to the AA cross section in FIG. 1, showing the door open state, and FIG. 10 is a cross-sectional view showing the door closed state of the cross section shown in FIG.

  As shown in FIG. 9, the weather strip 34 according to the third embodiment includes a mounting base 35 attached to the retainer portion 45 a of the door sash 45 and a first seal surface 47 a of the door opening edge 47 on the vehicle body 46 side. A tongue-like sub-seal lip 36 projecting from the mounting base 35 toward the front and a hollow shape projecting from the mounting base 35 toward the second seal surface 47b of the door opening edge 47 on the vehicle body 46 side. Main seal lip 37.

  The main seal lip 37 extends from the mounting base 35 toward the interior of the vehicle interior, and has a bottom wall portion 38 whose front end is seated on the door sash 45, and a second opening of the door opening edge 47 from the front end of the bottom wall portion 38. A peripheral wall 39 on the vehicle interior side rising toward the seal surface 47b side, a peripheral wall portion 40 on the vehicle exterior side rising from the mounting base 35 toward the second seal surface 47b side of the door opening edge 47, and And an arcuate top wall portion 41 straddling the respective peripheral wall portions 39, 40, and has a substantially D-shaped cross section as a whole.

  Further, the peripheral wall portions 39, 40 and the arcuate top wall portion 41 of the main seal lip 37 are formed as a two-layer structure composed of an outer layer 37a made of a low specific gravity material and an inner layer 37b made of a high specific gravity material, and The other parts of the weather strip 34, that is, the bottom wall portion 38 of the main seal lip 37, as well as the mounting base 35 and the sub seal lip 36 are formed of the same low specific gravity material as the outer layer 37a. This is the same as the embodiment. Further, the specific gravity and thickness of the outer layer 37a and the inner layer 37b are also set in the same manner as in the first embodiment described above, and the portion of the main seal lip 37 where the thickness of the inner layer 37b changes is provided on both peripheral wall portions. Thickness gradually changing portions 42 and 43 are formed in which the thickness of the inner layer 37b gradually decreases from the 39 and 40 sides toward the arcuate top wall portion 41 side.

  Further, a portion having a large thickness in the inner layer 37b extends from the peripheral wall portion 40 on the outer side of the vehicle compartment to a part of the arcuate top wall portion 41 continuous thereto, and the peripheral wall portion on the outer side of the vehicle compartment. Similar to the second embodiment described above, a bent portion 44 having a relatively large curvature is formed at the boundary portion between the arc 40 and the arcuate top wall portion 41.

  In the third embodiment, as shown in FIG. 10, when the door is closed, the weather strip 34 is sandwiched between the door sash 45 and the door opening edge 47 on the vehicle body 46 side. The sub seal lip 36 is bent and deformed from its base while being pressed against the first seal surface 47a, while the main seal lip 37 of the weather strip 34 is crushed in the door closing direction C while being pressed against the second seal surface 47b. become. Specifically, the arcuate top wall portion 41 is flexibly deformed following the second seal surface 47b when the door is closed, and pressed against the second seal surface 47b by a restoring force based on the deformation deformation of the peripheral wall portions 39 and 40. Will be. Therefore, the present embodiment can provide substantially the same effect as that of the second embodiment described above.

1 ... Front door (automobile door)
5b ... second sealing surface 6 ... weather strip 10 ... mounting base 12 ... main seal lip 12a ... outer layer 12b ... inner layer 14 ... inner side peripheral wall 15 ... outdoor outer peripheral wall 16 ... arc-shaped top wall 17 ... inner side Wall thickness gradually changing portion 18 ... Outside wall thickness gradually changing portion 27 ... Weather strip 29 ... Main seal lip 29a ... Outer layer 29b ... Inner layer 30 ... Room-side peripheral wall portion 31 ... Outdoor-side peripheral wall portion 32 ... Arc-shaped top Wall part 34 ... Weather strip 35 ... Mounting base part 37 ... Main seal lip 37a ... Outer layer 37b ... Inner layer 39 ... Indoor side peripheral wall part 40 ... Outdoor peripheral wall part 41 ... Arc-shaped top wall part 42 ... Indoor side wall thickness gradually Deformation part 43 ... Outer wall thickness gradually changing part 44 ... Bending part 47b ... Second seal surface T ... Total thickness T1 ... Thickness of inner layer in peripheral wall part T2 ... Thickness of inner layer in arcuate top wall part

Claims (8)

An attachment base attached to the peripheral part of the door for an automobile;
A hollow seal lip formed integrally projecting from the mounting base;
With
A weather strip for automobiles that seals the sealing lip by pressing the sealing lip against the sealing surface on the other side when the door is closed,
The seal lip has a peripheral wall portion on the indoor side and an outdoor side that rises toward the seal surface side that is the counterpart, and an arc-shaped top wall portion that straddles both of them, and both the peripheral wall portions and the arc-shaped top wall. The part has a two-layer structure of an outer layer made of a low specific gravity material and an inner layer made of a high specific gravity material having a specific gravity larger than that of the low specific gravity material,
Furthermore, the weather strip for automobiles, wherein the wall thickness of the inner layer is set to be larger than the wall thickness of the inner layer in the other portion of the peripheral wall portions on the indoor side and the outdoor side of the seal lip. The seal lip has an approximately oval cross-sectional shape and is integrally projected from the mounting base with the major axis direction as the projecting direction, and has a pressure contact with the seal surface that is the counterpart when the door is closed. It is designed to bend and deform in the minor axis direction from the root,
When the door is closed, the arc-shaped peripheral wall is pressed against the mating seal surface, while both the peripheral walls are set not to press against the mating seal surface, and the outer peripheral wall is mated when the door is closed. The automobile weather strip according to claim 1, wherein the weather strip is set to be substantially parallel to a sealing surface on the side.   The low specific gravity material forming the outer layer is a foam having a specific gravity of 0.2 to 0.5, and the high specific gravity material forming the inner layer is a foam having a specific gravity of 0.65 to 0.9. The weather strip for automobiles according to claim 1 or 2.   4. The automobile use according to claim 3, wherein the wall thickness of the inner layer is set in a range of 50 to 80% of the total wall thickness in each of the indoor and outdoor peripheral wall portions of the seal lip. Weather Strip.   The thickness of the inner layer is set in a range of 20 to 40% of the total thickness in other portions of the seal lip excluding the peripheral wall portions on the indoor side and on the outdoor side, respectively. The weather strip for automobiles according to 3 or 4.   The automobile according to any one of claims 1 to 5, wherein a thickness gradually changing portion that gradually changes from one thickness to the other thickness is formed at a portion where the thickness of the inner layer changes. Weather strip.   The automotive weather strip according to any one of claims 1 to 6, wherein a ratio of the thickness to a portion with a small thickness of the inner layer is set to 3 or less in a portion where the thickness of the inner layer is large.   8. A portion having a large inner layer thickness is formed from the outer peripheral wall portion of the seal lip to at least a part of an arcuate top wall portion continuous therewith. The weather strip for automobiles described in 1.

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