JP2013244915A - Automotive weather strip and mounting structure thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of sealing performance due to local rolling-up of seal pieces.SOLUTION: A wide seating bead portion 14 is formed at a tip of a leg portion 9 of an exterior compartment side out of a well portion 5. An cabin inside seal lip 15 and an cabin outside seal lip 16 inclined to be directed toward an oblique interior compartment side on a tip surface 14a of the seating bead portion 14 are aligned and protrudingly formed. By deflection deforming the both seal lips 15, 16 to positively get rolled up to the cabin inside at the time of mounting to a flange portion 3, sealing function is exerted in the form of double seal while preventing a local rolling-up.

Description

  The present invention is mounted on 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 is elastically contacted with a trunk lid or a back door as an opening / closing body so as to pass outside and inside the vehicle interior. The present invention relates to an automotive weather strip to be sealed and a mounting structure for the automotive weather strip.

  As a mounting structure of an automobile weather strip in the trunk lid opening or the back door opening of this type, a seal piece is provided on the outside leg of the welt portion having a substantially U-shaped cross section that is fitted and held on the flange portion on the vehicle body side. Japanese Patent Application Laid-Open No. H10-228561 describes a structure in which a vehicle body panel on which a flange portion is formed is sealed with the seal piece.

  In addition, it is not a mounting structure for automotive weather strips at the trunk lid opening or back door opening, but as a mounting structure for similar automotive weather strips for side window glass, it is a cross-section that is fitted and held on the flange of the vehicle body. Japanese Patent Application Laid-Open No. 2003-228443 discloses a seal member that is formed by extending a seal piece on the outdoor leg portion of the substantially U-shaped welt portion and bending the seal piece so as to be folded. Have been described.

JP 2009-78664 A Japanese Patent Laid-Open No. 5-278531 JP 2010-188850 A

  However, in the mounting structure described in Patent Document 1, the seal piece projecting from the outdoor leg portion of the welt portion is extended to the outside of the oblique chamber, and the seal piece is pressed or elastically contacted with the flange portion. Therefore, when attaching the welt part to the flange part, there may be a so-called stagnation in which a part of the tip of the seal piece is inverted to the indoor side, thereby reducing the sealing performance due to the disconnection of the seal line. In addition, there is a problem that the appearance quality deteriorates.

In addition, the structure described in Patent Document 2 can be applied as an automobile weather strip mounting structure in the trunk lid opening or the back door opening.
However, in the mounting structure described in Patent Document 2, the seal piece projecting from the outdoor leg portion of the welt portion is bent so as to be folded so as to be elastically contacted with the vehicle body panel. The followability with respect to a stepped portion such as a panel joining portion (a joggle joining portion) or a paint seal application portion is poor, and the sealing performance at the stepped portion tends to be insufficient. By bending the seal piece so as to be folded as described above, the tip of the seal piece important for the sealing function and the tip of the leg portion outside the welt portion do not come into contact with each other, and the pushing force of the welt portion is increased. This is based on the fact that it cannot be sufficiently transmitted to the tip of the seal piece.
If attention is paid only to bringing the tip of the seal piece into contact with the tip of the outdoor leg of the welt part, the tip of the seal piece is thickened, or the tip of the outdoor leg is overlaid. In this case, however, the seal piece is too strongly compressed in the general portion other than the stepped portion as described above, and the welt portion is held at a predetermined position of the flange portion by increasing the reaction force. Difficult to do.

  Here, as a technique similar to Patent Document 1, a technique described in Patent Document 3 has been proposed by the present applicant, but the technique described in Patent Document 3 is an extension of the technique described in Patent Document 1 above. However, the problem similar to that described in Patent Document 1 remains.

  The present invention has been made paying attention to such a problem, and a sealing piece is provided by projecting a sealing piece on a leg portion on the outdoor side of the welt portion, and this sealing piece is pressed against or elastically contacted with a vehicle body panel. Premises of a structure that exhibits high performance, prevents deterioration of sealing performance and deterioration of appearance quality due to swallowing of the sealing piece. The structure which can aim at improvement of is provided.

  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 vehicle body panel comprising: a welt portion; and a main seal portion integrally formed outside the connecting portion of the welt portion, wherein at least one leg portion on the outside of the welt portion is in pressure contact with the vehicle body panel. 1 is a structure of a weather strip for an automobile provided with a sealing function of a welt part against the motor.

  Then, an indoor side seal lip and an outdoor side seal lip are juxtaposedly formed on the distal end surface of the one leg portion so that both the indoor side seal lip and the outdoor side seal lip are directed obliquely toward the indoor side. The indoor side seal lip and the outdoor side seal lip are inclined. This is based on the idea that each of the sealing lips is actively swallowed into the indoor side, different from the conventional automobile weather strip described above.

  According to the second aspect of the present invention, the matter described in the first aspect is regarded as an automobile weather strip mounting structure, and in the state where one leg is pressed against the vehicle body panel, the indoor side seal lip is The indoor side surface of the outdoor side seal lip is in pressure contact with the outdoor side surface, and each seal lip is in pressure contact with the vehicle body panel in a state where both seal lips are in pressure contact with each other. Yes.

  In this case, in order to give a degree of freedom at the time of bending deformation of each seal lip, as described in claim 3, a seating bead portion having a width wider than that of the one leg portion at the tip of the one leg portion. It is desirable that the indoor-side seal lip and the outdoor-side seal lip protrude from the front end surface of the seating bead portion.

  Further, in the state where the two seal lips are pressed against each other as described above, the protruding length of the outdoor seal lip is set larger than that of the indoor seal lip as described in claim 4. It is desirable that Furthermore, in press-contacting the vehicle body panel in such a manner that each seal lip is actively swallowed into the indoor side while ensuring a separation distance between both seal lips, as described in claim 5, It is further desirable that the outdoor side surface of the seating bead portion including the outdoor side seal lip has a curved shape that is convex toward the outdoor side.

  In addition, in order to further improve the followability of the indoor side seal lip and the outdoor side seal lip with respect to the stepped portion on the vehicle body panel side, the welt portion including the one leg portion is a solid as described in claim 6. On the other hand, it is desirable that the indoor-side seal lip and the outdoor-side seal lip are formed of a rubber-based material that is softer than the welt portion.

  Furthermore, in order to bend and deform the outdoor seal lip more actively into the indoor side, as described in claim 7, as described in claim 7, the distal end surface of the one leg portion is located closer to the outdoor side. It is desirable that the portion has an inclined surface with a downward slope toward the outdoor side, and an outdoor side seal lip is formed protruding from the inclined surface.

  Therefore, in at least the first aspect of the invention, since both the indoor side seal lip and the outdoor side seal lip are inclined in advance so as to be directed to the oblique indoor side, the flange portion is attached when being attached to the counterpart flange portion. In response to the pushing force of the welt part against the vehicle body, both of these seal lips are seated on the vehicle body panel in such a manner as to be drowned inwardly. Each seal lip is bent and deformed with an independent degree of freedom and press-contacted or elastically contacted with the vehicle body panel to exhibit a sealing function in the form of a so-called double seal. Therefore, it is possible to follow faithfully even at local stepped parts such as joggle joints and paint seal application parts on the body panel side, such as stepped parts that are one step lower than the general part, and necessary and sufficient sealing performance Is secured.

  According to the first aspect of the present invention, the indoor side seal lip and the outdoor side seal lip are pressed against or elastically contacted with the vehicle body panel in such a manner that the indoor side seal lip and the outdoor side seal lip are squeezed into the indoor side. As a result, it is possible to prevent deterioration of the sealing performance and deterioration of the appearance quality due to local seal piece squeezing as in the past, as well as the joggle joint on the body panel side and the paint seal Even a local stepped portion such as a coating portion can be faithfully followed, and the sealing performance is improved.

  According to the second aspect of the present invention, the indoor side surface of the outdoor side seal lip is pressed against the outdoor side surface of the indoor side seal lip, and each seal lip is in contact with each other. Since the lip is pressed against the body panel, the outdoor seal lip can be faithfully followed even at a stepped portion that is one step lower than the general portion without increasing the bending allowance of the outdoor seal lip. A sealing reaction force can be ensured, and this also improves the sealing performance.

  According to the third aspect of the present invention, the seating bead portion wider than the one leg portion is formed at the tip end of the one leg portion, and the indoor side seal lip and the outdoor side are formed on the tip end surface of the seating bead portion. Since the seal lips are formed so as to be spaced apart from each other, each seal lip can be flexed and deformed independently and the assembly to the mating flange portion is good, and the mating side The pushing force with respect to the flange portion can be reliably transmitted to both the seal lips, and the outdoor seal lip can be faithfully followed even at the step portion which is one step lower than the general portion as described above.

  According to the fourth aspect of the present invention, since the protruding length of the outdoor side seal lip is set to be larger than that of the indoor side seal lip, both of the seal lips are in pressure contact with the vehicle body panel. These seal lips can also be brought into pressure contact with each other, and this also enables the outdoor seal lip to be faithfully followed even at a stepped portion that is one step lower than the general portion.

  According to the fifth aspect of the present invention, since the outdoor side surface of the seating bead portion including the outdoor side seal lip has a curved shape that protrudes toward the outdoor side, both the seal lips are more reliably connected to the indoor side. It can be pressed against the vehicle body panel as if it is swallowed, and there is no variation in the bending state of both seal lips, and the sealing performance is stabilized.

  According to the sixth aspect of the present invention, the welt part including one leg part is formed of a solid rubber-based material, while the indoor side seal lip and the outdoor side seal lip are softer than the welt part. Since it is made of a system material, there is an advantage that the bending state is further stabilized as well as the seating stability of both seal lips, and the sealing performance is further improved.

  According to the seventh aspect of the present invention, a portion of the distal end surface of one leg portion that is closer to the outdoor side is an inclined surface that is inclined downward toward the outdoor side, and the outdoor seal lip is formed from the inclined surface. Because of the protruding formation, the outdoor seal lip can be pressed against the vehicle body panel in a more reliable manner, and the bending state can be further stabilized along with the seating stability of both seal lips. Also, there is an advantage that the sealing performance is further improved.

The schematic explanatory drawing of the weather strip for motor vehicles with which the periphery of the back door opening part of a motor vehicle is mounted | worn. FIG. 2 is a diagram showing a specific embodiment for carrying out the present invention, and is a sectional view showing a free state of the automobile weather strip of FIG. 1 alone. The perspective view of the principal part corresponded to the Q section of FIG. FIG. 4 is a cross-sectional view showing a state where the automobile weather strip of FIG. 2 is fitted and held in a general part, and is a cross-sectional view taken along line AA of FIG. 3. FIG. 4 is a cross-sectional view showing a state in which the automobile weather strip of FIG. 2 is fitted and held in a step portion, and is a cross-sectional view taken along line BB of FIG. 3. The expanded sectional view of the principal part which shows the modification of the weather strip for motor vehicles of FIG.

  FIGS. 1 to 6 are views showing a concrete embodiment of an automobile weather strip and its mounting structure according to the present invention. FIG. 1 is attached to the periphery of an opening of a back door of an automobile, for example, in a closed loop shape. FIG. 2 is a schematic view of a long automobile weather strip, FIG. 2 is a sectional view of the automobile weather strip of FIG. 1 in a free state, and FIG. 3 is a side of a vehicle body panel to which the automobile weather strip of FIGS. FIG. 2 is an enlarged perspective view of a portion corresponding to the portion Q in FIG. 4 and 5 are cross-sectional views showing the state in which the automobile weather strip of FIG. 2 is fitted and held to the mating flange portion, and FIG. 4 is a cross-sectional view taken along the line AA of the general portion of FIG. FIG. 5 is a cross-sectional view taken along the line BB of the step portion in FIG. In addition, the code | symbol 4a in FIG. 1 has shown the connection part of the weather strip of a closed loop shape.

  Around the back door opening 1 on the vehicle body side shown in FIG. 1, a flange portion 3 is formed upright or upright from the vehicle body panel 2 side as shown in FIGS. A weather strip (hereinafter simply referred to as a weather strip) 4 is mounted. 2 and 3, the right side of the flange portion 3 is the outdoor side, and the left side is the indoor side.

  The weather strip 4 includes a welt portion 5 having a substantially U-shaped cross section that functions as a mounting base portion, and a hollow seal lip 6 as a main seal portion formed integrally with the welt portion 5. When the opening / closing body 7 such as a back door is brought into elastic contact with 6, the inside and outside of the passenger compartment is sealed.

  More specifically, the welt portion 5 is formed in a substantially U-shaped cross section by connecting a pair of indoor and outdoor leg portions 8 and 9 with a connecting portion 10 extending over both of them. Alternatively, a predetermined similar core material 19 made of resin is embedded along the longitudinal direction. A pair of holding lips 11 or 12 project from the inner side surfaces of the leg portions 8 and 9 in the welt portion 5, and the holding lips 11 and 12 are inserted into the flange portion 3 by inserting the welt portion 5 into the flange portion 3. The flange portion 3 is clamped from both sides while being bent, and the welt portion 5 having a substantially U-shaped cross section is fitted and held by the flange portion 3.

  In addition, a cover lip 13 having a substantially U-shaped cross section is formed to protrude from the base of the outer side surface of the leg 8 on the indoor side. This cover lip 13 is used, for example, when concealing or providing continuity with a terminal portion of a trim component (not shown) such as a finisher mounted on the indoor side.

  A seating bead portion 14 that is wider than other portions of the outdoor leg portion 9 is integrally formed at the distal end of the outdoor leg portion 9 in the welt portion 5, and the distal end surface of the seating bead portion 14 is formed. 14 a is a flat surface that is substantially parallel to the panel surface other than the flange portion 3 on the vehicle body panel 2 side in the state of regular attachment to the flange portion 3. An indoor-side seal lip 15 and an outdoor-side seal lip 16 are juxtaposed from both ends of the front end surface 14a of the seating bead portion 14 in the indoor / outdoor direction.

  More specifically, in FIG. 2 showing the free state of the weather strip 4, the indoor-side seal lip 15 and the outdoor-side seal lip 16 are separated from each other by a separation distance t1, and both of them are located obliquely inside the room. Inclined to point.

  Further, the connecting part 10 and the leg parts 8 and 9 of the welt part 5 and the seating bead part 14 are made of, for example, solid rubber, whereas the indoor seal lip 15 and the outdoor seal lip 16 are hollow. The seal lip 6, the cover lip 13, and the tip end portion 12 a of the holding lip 12 are formed of sponge rubber softer than solid rubber.

  Further, in the seating bead portion 14, the outdoor side surface 14b including the outdoor side seal lip 16 bulges toward the outdoor side, and has a curved shape that is substantially convex toward the outdoor side. As shown in FIG. 2, the protruding length of the outdoor seal lip 16 is larger than that of the indoor seal lip 15, and the indoor seal lip 15 and the outdoor seal lip 16 are The protrusion length is set to be larger than the separation distance t1.

  As shown in FIGS. 4 and 5, in the state where the outdoor leg portion 9 is in pressure contact with the panel surface on the vehicle body panel 2 side, that is, when the welt portion 5 is fitted and held on the flange portion 3, The indoor side surface of the outdoor side seal lip 16 is in pressure contact with the outdoor side surface of the indoor side seal lip 15, and the chambers of the respective seal lips 15 and 16 are in contact with each other. The outer surface is set so as to be in pressure contact with the panel surface on the vehicle body panel 2 side.

  Here, FIG. 3 shows panel elements 2a and 2b corresponding to the portion Q of FIG. 1 and constituting the vehicle body panel 2 as the structure of the main part on the vehicle body panel 2 side to which the weather strip 4 is attached. The expansion perspective view of the joggle junction part which is a mutual junction part is shown. In such a joggle joint, the joggle flange portion 17 corresponding to the plate thickness of the counterpart panel element 2b is formed with a step at the end of one panel element 2a. Both panel elements 2a and 2b are joined by receiving the other panel element 2b so that it may overlap on the flange part 17. FIG. In this case, in the general part other than the joggle flange part 17, both panel elements 2a and 2b which are the vehicle body panel 2 are flush with each other, but the other panel element 2b in the joggle flange part 17 does not overlap. In a part, generation | occurrence | production of the level | step-difference part 18 one step lower than a general part becomes inevitable.

Therefore, when allowing the weather strip 4 to be attached to the flange 3 on the other side after allowing the presence of the step 18 at the joggle joint, as shown in FIGS. When it is pushed into the flange portion 3 on the side and fitted and held, the front end portions of the indoor side seal lip 15 and the outdoor side seal lip 16 come into contact with the panel surface on the vehicle body panel 2 side, and both the seal lips 15 and 16 Therefore, both the sealing lips 15 and 16 are positively squeezed into the indoor side. In this case, both the sealing lips 15 and 16 are arranged in parallel on the seating bead portion 14 wider than the leg portion 9 on the outdoor side, and the separation distance of FIG. By securing t1, free bending deformation of the respective seal lips 15 and 16 is promoted.
Eventually, the indoor side surface of the outdoor side seal lip 16 comes into pressure contact with the outdoor side surface of the indoor side seal lip 15, and both the seal lips 15, 16 are in pressure contact with each other. The outer surfaces of the seal lips 15 and 16 are pressed against or elastically contacted in a so-called double seal so that they are seated on the panel surface on the vehicle body panel 2 side. For this reason, there is no room for disconnection of the seal line as in the prior art, the sealing performance is improved, and the appearance quality is not lowered as in the prior art.

  More specifically, in the general portion of the vehicle body panel 2, that is, in FIG. 4 corresponding to the cross section along line AA in FIG. 3, the pushing force of the welt portion 5 against the flange portion 3 is both via the wide seating bead portion 14. Therefore, both the seal lips 15 and 16 are bent and deformed so as to overlap each other, and are brought into pressure contact or elastic contact with the vehicle body panel 2. In this case, the bending reaction force of the indoor side seal lip 15 reaches the outdoor side seal lip 16, so that the front end of the indoor side seal lip 15 is pressed or elastically contacted with the vehicle body panel 2 as well as the outdoor side seal lip. The surface of the outdoor side of 16 is brought into pressure contact or elastic contact with the vehicle body panel 2 with a bending reaction force higher than that of the indoor side seal lip 15. And the inside and outside of the passenger compartment are reliably sealed in the form of a double seal by both seal lips 15 and 16. In particular, since the bending reaction force of the outdoor seal lip 16 can be further increased, water can be reliably prevented from entering from the outdoor side.

  On the other hand, in FIG. 5 corresponding to the cross section taken along line BB in FIG. 3, the step 18 is one step higher than the general portion of the vehicle panel 2 in FIG. Because of the lower height, the bending allowance of both seal lips 15 and 16 is smaller than that of FIG. 4, but the indoor side of the outdoor seal lip 16 is placed on the outdoor side surface of the indoor seal lip 15 as in FIG. The two seal lips 15 and 16 are both in pressure contact or elastic contact with the vehicle body panel 2 in a state where the surface of the contact is pressed. In this case, since the bending reaction force of the indoor-side seal lip 15 reaches the outdoor-side seal lip 16 as in FIG. 4, the stepped portion 18 is shaped so that the tip of the indoor-side seal lip 15 closely follows the stepped portion 18. Of course, the outdoor side surface of the outdoor seal lip 16 is pressed or elastically contacted with the stepped portion 18 in a manner that closely follows the stepped portion 18. In the step portion 18 as well, the inside and outside of the passenger compartment are reliably sealed in the form of a double seal with both seal lips 15 and 16.

  Here, when FIG. 4 is compared with FIG. 5, in FIG. 5, the bending allowance of both the sealing lips 15 and 16 is small by the depth of the stepped portion 18, whereas in FIG. The amount of bending of both the seal lips 15 and 16 is relatively larger than that in FIG. 5, and in FIG. 4, both the seal lips 15 and 16 are in pressure contact with the vehicle body panel 2 than in FIG. 5. . In FIG. 5 corresponding to the cross section taken along the line BB in FIG. 3, the bending allowance of both the seal lips 15 and 16 is small by the depth of the stepped portion 18, but the side of FIG. In the general part of FIG. 4 corresponding to the A-line cross section, the bending allowances of both seal lips 15 and 16 are greatly pressed compared to FIG. 5, so both seals accompanying the strong pressure contact in these general parts The bending reaction force of the lips 15 and 16 spreads to the stepped portion 18, and also in the stepped portion 18, both the seal lips 15 and 16 follow the stepped portion 18 in a manner that more reliably and faithfully follows the stepped portion 18. Or you will be elastic.

  Accordingly, regardless of whether the body panel 2 is the general part or the stepped part 18, an appropriate bending reaction force or seal reaction force can be obtained on both the seal lips 15, 16, and the general part and the stepped part are obtained. Since both the sealing lips 15 and 16 are pressed against each other or elastically contacted with each other in a manner faithfully following 18, the inside and outside of the passenger compartment can be reliably sealed in the form of a double seal. Therefore, there is no room for disconnection of the seal line as in the conventional case, the sealing performance is improved, and the appearance quality is not deteriorated.

  FIG. 6 is an enlarged view of a main part of a modified example of the automobile weather strip and its mounting structure described above, and the same reference numerals are given to the parts common to FIG.

  In the modification shown in FIG. 6, substantially half of the front end surface 14 a of the seating bead portion 14 in the outdoor leg portion 9 having the indoor seal lip 15 and the outdoor seal lip 16 described above is close to the outdoor side. The portion is an inclined surface having a downward slope toward the outdoor side, and the outdoor side seal lip 16 projects from the inclined surface.

  In the modification shown in FIG. 6, since the outdoor seal lip 16 is inclined toward the indoor side including its root portion, the outdoor seal lip 16 is bent and deformed so as to be more actively swallowed into the indoor side. This is advantageous, and in particular, the bending deformation behavior of the outdoor seal lip 16 becomes more stable.

2 ... Body panel 3 ... Flange part 4 ... Weather strip for automobile 5 ... Welt part 6 ... Hollow seal lip (main seal part)
DESCRIPTION OF SYMBOLS 8 ... Indoor side leg part 9 ... Outdoor side leg part 10 ... Connection part 14 ... Seating bead part 14a ... Front end surface 14b ... Outdoor side surface 15 ... Indoor side seal lip 16 ... Outdoor side seal lip

Claims (7)

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,
The indoor side seal lip and the outdoor side seal lip are juxtaposed and formed on the distal end surface of the one leg part,
A weather strip for automobiles, wherein the indoor side seal lip and the outdoor side seal lip are inclined so that both the indoor side seal lip and the outdoor side seal lip are directed obliquely toward the indoor side. The automobile weather strip mounting structure according to claim 1,
In a state where the one leg portion is in pressure contact with the vehicle body panel, the indoor side surface of the outdoor side seal lip is pressed against the outdoor side surface of the indoor side seal lip,
1. A weatherstrip mounting structure for an automobile, wherein both seal lips are in pressure contact with each other and each seal lip is in pressure contact with a vehicle body panel. Forming a seating bead portion wider than the one leg portion at the tip of the one leg portion;
The mounting structure for an automotive weather strip according to claim 2, wherein the indoor side seal lip and the outdoor side seal lip are formed to protrude from the front end surface of the seating bead portion.   4. The automobile weather strip mounting structure according to claim 3, wherein the protruding length of the outdoor seal lip is set larger than that of the indoor seal lip.   5. The weatherstrip mounting structure for an automobile according to claim 4, wherein the outdoor side surface of the seating bead portion including the outdoor side seal lip has a curved shape that is convex toward the outdoor side. While the welt part including the one leg part is formed of a solid rubber-based material,
6. The automobile weather strip attachment according to claim 2, wherein the indoor-side seal lip and the outdoor-side seal lip are formed of a rubber-based material that is softer than the welt portion. Construction.   A portion of the distal end surface of the one leg portion that is closer to the outdoor side is an inclined surface that is inclined downward toward the outdoor side, and an outdoor side seal lip projects from the inclined surface. The mounting structure of the weather strip for motor vehicles as described in any one of Claims 2-6.

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