JP5256072B2 - Weather strip for automobile - Google Patents

Description

  The present invention is applied to an automotive weather strip, particularly a trunk lid opening or a back door (tail gate) opening serving as an opening of a luggage room on the vehicle body side, and a trunk lid or back door as an opening / closing body. The present invention relates to an improvement in an automotive weather strip that comes into contact with and seals the interior and exterior of a vehicle.

  As is well known, a weather strip that elastically contacts the back door or trunk lid of an automobile and seals the outside of the vehicle interior includes a welt portion having a substantially U-shaped cross section that is fitted and held on a flange portion on the vehicle body side, A main seal part such as a hollow seal lip formed integrally with the welt part is used as a basic element, but apart from the main seal part, a seal piece projects from the leg part of the welt part. There is a seal piece that performs sealing on the base side of the flange portion. A typical example is described in FIG. 5 of Patent Document 1.

In the thing of the above-mentioned patent document 1, after making a solid rubber piece protrude diagonally from one leg part of a welt part, it is further sponge-like soft from the front end side of the solid rubber piece. A rubber seal piece is formed as an extension, and the seal piece is pressed against the vehicle body panel to obtain a predetermined sealing performance.

  However, in the structure described in Patent Document 1, only the root portion of the sponge-like soft rubber seal piece is backed up with solid rubber. Insufficient rigidity or pressing force against the panel surface of the car body, so-called sealing surface pressure is insufficient, and problems such as squeezing, folding, or undulation during assembly are likely to occur, and there are still problems in improving sealing performance. ing.

  In particular, there is a risk that the continuity of the seal line may be interrupted due to the lack of the seal surface pressure, and the followability to the step at the joggle coupling part or paint seal application part on the vehicle body panel side is poor, which reduces the sealing performance. It is a factor.

  The present invention has been made paying attention to such a problem, and provides a structure of a weather strip for an automobile in which the sealing performance of the welt portion with respect to the panel surface on the vehicle body side is improved.

  According to the first aspect of the present invention, the pair of leg portions are connected to each other by a connecting portion extending over both of them, so that it is formed in a substantially U-shaped cross section, and is fitted and held on a flange portion that is erected on the vehicle body panel. A main seal portion integrally formed on the outside of the connecting portion of the welt portion, and at least one leg portion on the outside of the welt portion is in pressure contact with the vehicle body panel to the vehicle body panel. It is premised on the structure of a weather strip for automobiles provided with a sealing function for the welt part.

  Then, a water-stopping lip is obliquely formed from the same solid material as that of the welt part on the outer surface of the tip part of the one leg part which is the outdoor side of the welt part. A V-shaped space is formed with the lip, and the front end surfaces of the one leg portion and the water stop lip are aligned on the same plane substantially parallel to the panel surface on which the flange portion is erected. A soft seal layer is integrally extended with a highly foamed sponge material on each of the one leg part including the character-shaped space and the front end face side of the water stop lip.

  Desirably, as described in claim 2, one of the leg portions including the V-shaped space and the distal end surface side of the water stop lip has one of the most distal surfaces including the V-shaped space. It is assumed that the soft seal layer is integrally extended so as to have a substantially similar shape to the front end side of each of the leg portion and the water stop lip.

  More preferably, the portion corresponding to at least the deepest portion of the V-shaped space on the most distal surface of the soft seal layer is the panel in the normal fitting and holding state of the welt portion with respect to the flange portion. It is set so as not to contact the surface, and the soft seal layer is assumed to exhibit a sealing function in the form of a double seal.

  In this case, as described in claim 4, the specific gravity of the highly foamed sponge material forming the soft seal layer is, for example, about 0.2 to 0.5.

  Therefore, in the invention according to at least claim 1, since the soft seal layer is backed up by the respective front end surfaces of the one leg portion and the water stop lip, there is a problem such as squeezing or bending at the time of assembly or undulation. Not only is there no room for occurrence, but the rigidity or pressing force and consequently the seal surface pressure is not insufficient, so that necessary and sufficient sealing performance can be ensured.

  According to the first aspect of the present invention, the sealing surface pressure of the soft sealing layer can be sufficiently ensured, so that no so-called disconnection of the sealing line occurs, and the step followability on the panel surface side is excellent. The seal performance is greatly improved.

  In addition, since the soft seal layer is difficult to be troubled such as squeezing, breaking, or undulation during assembly, the assembly workability is also improved.

  According to the second and third aspects of the invention, since the soft seal layer has a so-called double seal structure, further improvement in seal performance can be expected.

It is a figure which shows 1st Embodiment of the weather strip for motor vehicles based on this invention, and is expanded sectional explanatory drawing in alignment with the aa line | wire of (A) of FIG. 2, (B). (A), (B) is a schematic explanatory drawing which shows the closed loop shape of the whole weather strip shown in FIG. FIG. 4 is a diagram showing a second embodiment of an automotive weather strip according to the present invention, and is an enlarged cross-sectional explanatory view of the same portion as FIG. 1.

  FIG. 1 is a sectional view showing a concrete first embodiment of a weather strip structure according to the present invention. As shown in FIG. 2, a weather strip 3 having a substantially uniform cross-sectional shape is mounted in a so-called closed loop shape in the form of (A) or (B) in the trunk lid opening or the back door opening on the vehicle body side. Thus, here, FIG. 1 shows a cross-sectional view taken along the line aa in FIGS. In addition, the code | symbol 3a in (A) of FIG. 2 (B) has shown the connection part.

  As shown in FIG. 1, a flange portion 2 is formed upright or upright from a vehicle body panel 1 side around a trunk lid opening portion or a back door opening portion on the vehicle body side, and a weather strip 3 is formed on the flange portion 2. Installed. Here, the right side of the flange portion 2 is the vehicle interior side, and the left side is the vehicle interior side.

  As is well known, the weather strip 3 includes a welt portion 4 having a substantially U-shaped cross section that functions as a mounting base, and a hollow seal lip 5 as a main seal portion formed integrally with the welt portion 4. The interior and exterior of the vehicle are sealed by the opening and closing body 6 such as a trunk lid or a back door elastically contacting the hollow seal lip 5.

  More specifically, the welt part 4 is formed in a substantially U-shaped cross section by connecting a pair of leg parts 5a, 5b inside and outside the vehicle interior with a connecting part 5c extending over both of them. A predetermined core 7 made of resin or resin is embedded along the longitudinal direction. A pair of holding lips 8 or 9 project from the inner surfaces of the leg portions 5a and 5b in the welt portion 4, and when the welt portion 4 is inserted into the flange portion 2, the holding lips 8 and 9 are formed. The flange portion 2 is clamped from both sides while being bent, and the welt portion 4 having a substantially U-shaped cross section is fitted and held on the flange portion 2.

  Note that a cover lip 10 is formed to protrude from the vehicle interior side leg 5a of the welt 4. This cover lip 10 is used, for example, when concealing or providing continuity to a terminal portion of a trim component (not shown) such as a finisher mounted on the vehicle interior side.

  Further, the leg portions 5a and 5b and the connecting portion 5c of the welt portion 4 are formed of, for example, solid rubber, whereas the hollow seal lip 5, the cover lip 10, and the tip end portion 9a of the holding lip 9 are solid rubber. It is made of softer sponge rubber.

  A so-called very thick soft seal layer 11 having a thickness larger than that of the welt part 4 is integrally formed at the tip of the leg part 5b outside the vehicle compartment in the welt part 4, and the leg part on the vehicle interior side is also formed. A soft seal layer 12 is also formed at the tip of 5a. Here, a water-stopping lip 13 having a wall thickness equivalent to that of the leg portion 5b is formed obliquely on the outer surface (outer side surface) of the front end portion of the leg portion 5b outside the passenger compartment, and the leg portion 5b outside the passenger compartment. A V-shaped space 14 is formed with the water stop lip 13. In addition, a soft seal layer 11 is integrally formed on the front end surfaces 15a and 13a of the outer leg portion 5b including the V-shaped space 14 and the water stop lip 13 respectively.

  More specifically, in the portion corresponding to the tip surface 15a of the leg portion 5b outside the passenger compartment or the V-shaped space 14 in the soft seal layer 11, the tip surface 15a or V-shape of the leg portion 5b outside the passenger compartment. On the other hand, the portion of the soft seal layer 11 corresponding to the oblique seal lip 13 extends along the oblique axis direction of the seal lip 13. The shape is extended and expanded as it is. As a result, the leading end surface of the soft seal layer 11 has the front end surfaces 15a and 13a side of the leg portion 5b including the V-shaped space 14 on the side of the welt portion 4 and the water stop lip 13 enlarged to the outside of the passenger compartment. Such a substantially similar shape is formed, and a so-called double seal lip shape in which two seal lips 17 and 18 are arranged in parallel with the V-shaped space 16 in between is formed.

  The front end surfaces 15b, 15a, 13a of both the leg portions 5a, 5b and the water stop lip 13 are arranged on the side of the vehicle body panel 1 on which the flange portion 2 is erected in the normal assembly state as shown in FIG. They are aligned on the same plane that is substantially parallel to the panel surface, and the respective soft seal layers 11 or 12 are formed with their tip surfaces 15b, 15a, 13a as boundaries. These soft seal layers 11 and 12 are formed of a rubber material that is softer than the sponge rubber forming the seal lip 5 and the cover lip 10, for example, a highly foamed sponge rubber. The specific gravity of the highly foamed sponge rubber forming each of the soft seal layers 11 and 12 is, for example, about 0.2 to 0.5.

  Thus, as will be described later, even when the soft seal layer 11 at the tip of the leg portion 5b outside the passenger compartment is pressed against and seated on the panel surface on the vehicle body panel 1 side to bend and deform, the V-shape on the soft seal layer 11 side In order to prevent the space 16 from being crushed and the V-shaped space 16 from disappearing completely, consideration is given to leaving the deepest part side that is a part of the V-shaped space 16.

  Therefore, according to the weather strip 3 configured in this way, as shown in FIG. 1, in the normal assembly state in which the welt portion 4 is fitted and held on the flange portion 2 on the vehicle body panel 1 side, The soft seal layer 11 formed at the tip of the portion 5b is pressed against and seated on the panel surface on the vehicle body panel 1 side, and the predetermined seal performance is ensured by the bending deformation of the soft seal layer 11.

  In this case, when the soft seal layer 11 at the tip of the leg portion 5b outside the passenger compartment is bent and deformed, as described above, the deepest portion side which is a part of the V-shaped space 16 on the soft seal layer 11 side. Therefore, the soft seal layer 11 is formed so that the remaining part of the V-shaped space 16 with the deepest part remaining is the leg outside the vehicle compartment. The body 5 is pressed against the vehicle body panel 1 in the form of a so-called double seal structure with a predetermined seal surface pressure while being backed up by the front end surfaces 15a and 13a of the water stop lip 13.

  Therefore, when the weather strip 3 is attached to the flange portion 2, the soft seal layer 11 does not suffer from problems such as entanglement, breakage, or undulation. Moreover, since it can be sealed in the form of a double seal while ensuring a necessary and sufficient seal surface pressure, for example, even if there is a step on the vehicle body panel 1 side, it is possible to reliably follow the step. It is possible to reliably seal without causing breakage or the like.

  In addition, since the deepest part side, which is a part of the V-shaped space 16 on the soft seal layer 11 side, is considered to remain as a space without being crushed as described above, the space part is a drainage channel. The water drainage performance when water intrudes into the space should be good.

  Here, as is apparent from FIG. 1, the soft seal layer 11 at the tip of the leg 5b outside the passenger compartment is in pressure contact with the vehicle body panel 1, whereas the soft seal layer at the tip of the leg 5a inside the passenger compartment. 12 does not press against the vehicle body panel 1. However, the soft seal layer 12 at the tip of the leg portion 5a on the vehicle interior side may be configured to be pressed against the vehicle body panel 1 as necessary.

  In the first embodiment, the welt portion 4 is made of solid rubber, the hollow seal lip 5 and the cover lip 10 are made of sponge rubber, and the soft seal layers 11 and 12 are made of high foamed sponge rubber. However, any material can be replaced with a so-called resin-based material such as a thermoplastic elastomer.

  FIG. 3 is a view showing a second embodiment of a weather strip for automobiles according to the present invention, and the same reference numerals are given to portions common to FIG.

  In the second embodiment, as is apparent from the comparison with FIG. 1, the lip-shaped soft seal layer 21 formed on the side of the front end surface 15 a, 13 a of the water stop lip 13 and the leg portion 5 b outside the passenger compartment is provided. This is substantially a so-called single seal type.

  In the second embodiment, although the double seal structure as in the first embodiment is not obtained, it is possible to secure a larger pressure contact area of the soft seal layer 21 to the vehicle body panel 1. Thus, substantially the same effect as the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Car body panel 2 ... Flange part 3 ... Weather strip 4 ... Welt part 5 ... Hollow seal lip (main seal part)
5a ... Legs on the vehicle interior side 5b ... Legs on the outside of the vehicle compartment 5c ... Connecting portion 11 ... Soft seal layer 13 ... Water stop lip 13a ... Tip surface 14 ... V-shaped space 15a ... Tip surface 16 ... V-shaped space 17 ... Seal lip 18 ... Seal lip 21 ... Soft seal layer

Claims (4)

A welt part that is formed in a substantially U-shaped cross-section by connecting a pair of leg parts with a connecting part that spans both, and is fitted and held on a flange part that is erected on the vehicle body panel;
A main seal portion integrally formed outside the connecting portion of the welt portion;
With
A weather strip for an automobile provided with a sealing function of a welt portion with respect to a vehicle body panel by pressing at least one leg portion on the outdoor side of the welt portion to the vehicle body panel,
By forming a water stop lip obliquely with the same solid material as that of the welt part on the outer surface of the one leg part which is the outdoor side of the welt part, the one leg part and the water stop lip V While forming a character space,
Each of the one leg and the water stop lip are aligned on the same plane substantially parallel to the panel surface on which the flange portion is erected,
A weather strip for automobiles, wherein a soft seal layer is integrally extended with a highly foamed sponge material on each of the front end surfaces of the one leg portion and the water stop lip including the V-shaped space. .   One leg part including the V-shaped space and the front end surface side of the water stop lip, and the front end surface of each leg part including the V-shaped space and the front end surface side of the water stop lip The automobile weather strip according to claim 1, wherein the soft seal layer is integrally extended so as to have a shape substantially similar to that of the automobile weather strip. The portion corresponding to at least the deepest portion of the V-shaped space on the most distal surface of the soft seal layer is set so as not to contact the panel surface in the normal fitting holding state of the welt portion with respect to the flange portion,
The automobile weather strip according to claim 2, wherein the soft seal layer exhibits a sealing function in the form of a double seal.   4. The automobile weather strip according to claim 1, wherein a specific gravity of the highly foamed sponge material forming the soft seal layer is 0.2 to 0.5.

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