JP5152118B2 - Weather strip - Google Patents

Description

  The present invention relates to a weather strip, and more particularly to a weather strip having a cover lip without an insert embedded in a trim portion having a substantially U-shaped cross section.

A weather strip having a trim portion having a substantially U-shaped cross section is provided on the flange at the periphery of the opening in a body of an automobile or the like.
The weather strip is provided with a trim portion having a substantially U-shaped cross section that is held by being fitted to a flange at the periphery of an opening (for example, an opening facing the back door) in the body, and is protruded from the trim. And a hollow seal portion that contacts and seals with an opening / closing member that opens and closes the opening.
When the opening is an opening facing the back door, the opening and closing member is a back door, and when the back door is closed, the peripheral edge of the back surface of the back door is a hollow seal of the weather strip. When the seal portion comes into contact with the portion and the seal portion is crushed and deformed, a gap between the back door and the opening (body) facing the back door is sealed.
Further, the weather strip is generally formed by a so-called extrusion method in many parts or all in the longitudinal direction.

The trim portion includes a vehicle inner side wall, a vehicle outer side wall, and a bottom wall that connects both side walls, and has a substantially U-shaped cross section.
A flange holding lip that extends toward the inside of the substantially U-shaped cross section is integrally formed on the inner surfaces of both side walls of the trim portion.

The trim portion is generally formed by embedding, for example, a sheet metal insert inside a coating material of a polymer material such as rubber.
The insert includes a plurality of strip-shaped bone fragments that are arranged substantially parallel to each other, and a bond portion that connects the bone fragments. The bond portion may be divided after the weather strip is formed in order to improve the flexibility of the weather strip.

  When attaching the weather strip to the body, the flange of the body is fitted inside the trim part with a substantially U-shaped cross section, and the trim is attached based on the elastic force of the flange holding lip or the binding force of the insert. The state is maintained.

Some trims of weather strips are provided with a cover lip that covers an end of an interior member such as garnish (see, for example, Patent Document 1).
This cover lip protrudes from the side wall of the trim part. This is because the cover lip is located at a position deviating from the radius of curvature of the bend when the trim part in which the insert is embedded is bent into a substantially U-shaped cross section. This is due to the fact that the base portion of the trim is arranged to facilitate bending deformation of the trim portion.
When the base part of the cover lip is within the range of the radius of curvature of the bending, the surface of the covering material appears to be depressed along with the bending, and the appearance is deteriorated. The bending radius of curvature is set outside the range.

In recent years, there has been an increasing demand for weight reduction of weather strips, and an insertless weather strip has been proposed in which a sheet metal insert is not provided inside the trim covering material (for example, Patent Document 2). And Patent Document 3).
Also in the insertless weather strip described in Patent Document 2, the protruding position of the base portion of the cover lip is the middle position of the side wall, similar to the weather strip in which the conventional sheet metal insert is embedded.

  By the way, as an insertless weather strip in which a sheet metal insert is not provided inside the covering material of the trim portion, the applicant of the present invention has described that “the trim portion includes a trim portion and a hollow seal portion, and the trim portion includes a vehicle outer side wall, a bottom wall, and a vehicle. The inner side wall has a substantially U-shaped cross section, and inside the substantially U-shaped cross section, flange holding lips are respectively extended from the inner surface of the vehicle outer side wall and the vehicle inner side wall, and the vehicle outer side wall, the bottom wall, and the vehicle inner side wall are Rubber or thermoplastic elastomer, IRHD (international rubber hardness) is 75 degrees or more and 100 degrees or less, and only the hard material with an apparent specific gravity of 0.8 or more is formed. The outer surface of the corner portion of the inner side wall is formed at an angle of 90 degrees or more and 100 degrees or less, and the corner portion has a curvature radius of 0.2 mm or more and 2 mm or less. Bottom wall A bent portion is formed at a position closer to the tip side of each side wall than the thickness and at a position closer to the bottom wall side than the center of each side wall, and is formed so that the tip side is closer to the opposite side wall direction from the bent portion. Proposed is a weather strip formed such that the front and rear flange holding lips of the vehicle overlap each other in the vertical direction (see Japanese Patent Application No. 2008-316526).

JP 2009-107470 A JP 2006-321385 A JP 2008-230258 A

According to the above invention, since the sheet metal insert is not provided inside the covering material of the trim portion, the weight is reduced, and the trim portion and the flange holding lip are configured in a specific shape. Can be increased.
However, in the portion where the plate thickness of the flange is thick, the side wall of the trim portion may be deformed in a direction in which the portions from the bent portion to the tip thereof are separated from each other. When the protruding position of the base portion of the cover lip is located between the bent portion, which is an intermediate portion of the side wall of the trim portion, and the tip, the tip of the cover lip is brought into contact with the interior member or the like along with the above deformation. There is a problem in that it moves away from the contact side member, the appearance of the appearance deteriorates, and the sealing performance against sound and the like also deteriorates.

  The present invention has been made in order to solve the above-described problems, and its purpose is to meet the demand for weight reduction and to secure the tip position of the cover lip to improve the appearance and the sealing performance. It is to provide an insertless weather strip.

  Hereinafter, each means suitable for solving the above-described object will be described in terms of items. In addition, the effect etc. peculiar to a corresponding means are added as needed.

Means 1. A trim part having a substantially U-shaped cross section, which is held by a flange at the periphery of the opening part of the body of the automobile and has a bottom wall connecting the vehicle inner side wall, the vehicle outer side wall and both side walls, and protrudes from the trim part. A trim part having a hollow seal part that is pressed against the periphery of the opening and closing member when the opening and closing member that opens and closes the part is closed, and a cover lip that protrudes from a side wall of the trim part and covers an edge of the interior member The vehicle outer side wall, the bottom wall and the vehicle inner side wall have a substantially U-shaped cross section, and a flange holding lip is extended from the inner surface of the vehicle outer side wall and the vehicle inner side wall inside the substantially U-shaped cross section. The side wall, bottom wall, and vehicle interior side wall are made of a hard material that is rubber or thermoplastic elastomer and has an IRHD (International Rubber Hardness) of 75 degrees or more and 100 degrees or less and an apparent specific gravity of 0.8 or more. Side wall corner And the outer surface of the corner portion of the bottom wall and the vehicle interior side wall are formed at an angle of 90 degrees or more and 100 degrees or less, and the curvature radius of the corner portion is formed at 0.2 mm or more and 2 mm or less. Alternatively, a bent portion is formed on the inner side wall of the vehicle on the tip side of each side wall relative to the thickness of the bottom wall and on the bottom wall side of the center of each side wall. A weather strip formed so that the front ends of the flange holding lips on the vehicle outer side and the vehicle inner side overlap each other in the vertical direction,
A weather strip, wherein a protruding position of a base portion of the cover lip is positioned between a bent portion of a side wall of the trim portion and a bottom wall of the trim portion.

According to the means 1, the protruding position of the base part of the cover lip of the weather strip is located between the bent part of the side wall of the trim part and the bottom wall of the trim part.
For this reason, when the trim part of the weather strip is attached to the thick part of the flange of the body, the cover lip is deformed even if the side wall of the trim part is deformed in the direction away from the bent part. Since it protrudes from between the bent part of the side wall of the trim part which has no effect and the bottom wall of the trim part, the tip of the cover lip does not move away from the contact partner member such as the interior member, and the appearance There will be no deterioration in the appearance of the sound and deterioration of the sealing performance against sound.

Further, according to the means 1, the outer side wall, the bottom wall, and the inner side wall of the vehicle are made of rubber or thermoplastic elastomer and have an IRHD (international rubber hardness) of 75 degrees to 100 degrees and an apparent specific gravity of 0.8 or more. Therefore, the rigidity of the entire trim portion is increased, and the force for clamping the flange is large even if the insert is not embedded. And since the hard material of rubber | gum or a thermoplastic elastomer is extruded without an insert, extrusion molding is easy and productivity is high. In addition, since there is no insert, the weight of the weather strip can be reduced.
By the way, if the IRHD (international rubber hardness) is less than 75 degrees, the rigidity of the entire trim portion is lowered and the force for holding the flange is reduced. If the IRDH exceeds 100 degrees, the wafer is attached to the flange. The force when bending the strip along the corner shape of the body becomes high. On the other hand, if the apparent specific gravity is less than 0.8, the rigidity of the entire trim portion is lowered and the force for holding the flange is reduced, and the product is not established.

Further, according to the means 1, the corners of the bottom wall and the vehicle outer side wall and the outer surfaces of the corners of the bottom wall and the vehicle inner side wall are formed at an angle of 90 degrees or more and 100 degrees or less. For this reason, the angle formed by the vehicle outer side wall and the vehicle inner side wall with the bottom wall is a right angle or an obtuse angle close to a right angle, and the trim portion has an effect of ensuring the rigidity to maintain the substantially U-shaped cross section. ing.
By setting the position of the bent portion to a predetermined position on the side wall, it is possible to deform only the front end side portion of the side wall when the trim portion is bent and attached to the flange while securing a substantially U-shaped cross section.
At this time, since the cover lip protrudes from a portion which does not affect the deformation of the side wall, the cover lip is not deformed.

Furthermore, according to the means 1, the curvature radius of the corner portion of the trim portion is formed to be 0.2 mm or more and 2 mm or less, and the curvature radius of the corner portion of the vehicle outer side wall and the bottom wall and the vehicle inner side wall and the corner portion of the bottom wall. Is formed in the range of 0.2 mm to 2 mm, the same shape effect as the square shape is obtained, the rigidity of both corners is improved, and the force of holding the flange between the vehicle outer side wall and the vehicle inner side wall is large. Thus, even if the insert is not embedded, the trim portion does not come off the flange.
Incidentally, if the radius of curvature of the corner portion of the corner portion is less than 0.2 mm, the manufacture is not easy, and if it exceeds 2 mm, the same shape effect as the square shape cannot be obtained.

  Mean 2. The weather strip according to claim 1, wherein the upper surface of the cover lip is formed to be flush with the upper surface of the bottom wall of the trim portion.

  According to the means 2, since the upper surface of the cover lip is continuously formed flush with the upper surface of the bottom wall of the trim portion, the appearance of the base portion of the cover lip is further improved.

In the weather strip of the present invention, the protruding position of the base portion of the cover lip is positioned between the bent portion of the side wall of the trim portion and the bottom wall of the trim portion. Therefore, when the trim portion of the weather strip is attached to a portion where the thickness of the flange of the body is thick, the side wall of the trim portion is deformed from the bent portion to the direction in which the tip side portions are separated from each other. However, since the cover lip protrudes from between the bent portion of the side wall of the trim portion and the bottom wall of the trim portion, which does not affect the deformation thereof, the direction in which the front end of the cover lip separates from the abutting counterpart member such as the interior member Therefore, there is no deterioration of the appearance and the deterioration of the sealing performance against sound or the like.
As a result, it is possible to obtain an insert-less weather strip that meets the demand for weight reduction and has a good appearance and sealability by securing the tip position of the cover lip.

FIG. 1 is a sectional view showing a weather strip in the first embodiment. FIG. 2 is a cross-sectional view showing a weather strip according to the second embodiment. FIG. 3 is a front view of the back door of the automobile as viewed from the rear. FIG. 4 is a schematic explanatory diagram showing the angle of the corner portion of the trim portion.

  Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, which is a cross-sectional view of a weather strip 10 and a cross-sectional view taken along a line AA in FIG. 3 is a front view of the back door of the automobile as viewed from the rear, and shows the relationship between the opening peripheral edge 6 of the body 1 of the automobile and the back door 2 in the back door, and FIG. It is a schematic explanatory drawing showing the angle etc. of the corner part.
The first embodiment of the present invention will be described by taking the weather strip 10 attached to the periphery of the opening facing the back door as an example, but the present invention relates to a trunk room, a side door opening, a roof opening, an engine. It can be used for a weather strip that seals the opening of an automobile body such as a room.

As shown in FIGS. 1 and 3, a weather strip 10 according to a first embodiment of the present invention includes a trim portion 20 attached to a flange 7 of an opening peripheral edge 6 of an automobile body 1, and the opening portion. It forms from the hollow seal part 40 which contact | abuts and seals the back door 2 as an opening-and-closing member which opens and closes.
The trim portion 20 has a substantially U-shaped cross section including a vehicle outer side wall 21, a vehicle inner side wall 22, and a bottom wall 23. Inside the walls of the vehicle outer side wall 21, the vehicle inner side wall 22 and the bottom wall 23, an insert made of a bone piece made of sheet metal or the like is not embedded, and is formed only of a hard material of rubber or thermoplastic elastomer. .

As shown in FIG. 4, the vehicle outer side wall 21 and the bottom wall 23 are connected at the corner portion, and the corner portion 21 b that is the outer surface of the corner portion is defined as an angle α <b> 1 formed by the vehicle outer side wall 21 and the bottom wall 23. The angle α1 is an angle of 90 degrees or more and 100 degrees or less. In the present embodiment, the angle α1 is formed at 95 degrees.
Similarly, the vehicle interior side wall 22 and the bottom wall 23 are connected at the corner portion, and the corner portion 22b which is the outer surface of the corner portion is defined as an angle α2 formed by the vehicle interior side wall 22 and the bottom wall 23, and the angle α2 Is formed at an angle of 90 degrees to 100 degrees. In the present embodiment, the angle α2 is also formed at 95 degrees.
For this reason, the angle of each corner part is formed at a right angle or an obtuse angle close to a right angle, the rigidity of the corner parts of the vehicle outer side wall 21 and the vehicle inner side wall 22 is improved, and consequently, the trim part 20 has a substantially U-shaped cross section. Is stable.

  The corner 21b of the outer surface of the corner portion of the bottom wall 23 and the vehicle outer side wall 21 and the corner 22b of the outer surface of the corner portion of the bottom wall 23 and the vehicle inner side wall 22 are formed with a radius of curvature of 0.5 mm. For this reason, the rigidity of both corner portions is improved, the vehicle outer side wall 21 and the vehicle inner side wall 22 do not open around the corner portion, and the trim portion 20 can be connected to the flange 7 without embedding a sheet metal insert. It will not come off.

The curvature radii of the corner portions 21b and 22b on the outer surface of the corner portion are preferably formed in a range of 0.2 mm or more and 2.0 mm or less, respectively. In this case, it is possible to obtain the same effect as in the case of forming with 0.5 mm.
By the way, if the corner radii 21b and 22b have a radius of curvature of less than 0.2 mm, the radius of curvature of the corner 22b is too small to be easily manufactured. Can't get.

In the present embodiment, the vehicle outer side wall 21, the vehicle inner side wall 22 and the bottom wall 23 are made of a hard material made of rubber or thermoplastic elastomer having an IRHD (international rubber hardness) of 90 degrees and an apparent specific gravity of 1.2. Yes.
For this reason, the rigidity of the whole trim part 20 becomes high, and even if it does not embed an insert, the cross-sectional substantially U-shaped shape of the trim part 20 can be hold | maintained stably. Further, since a hard material of rubber or thermoplastic elastomer is extruded without an insert, extrusion is easy and productivity is high.

The vehicle outer side wall 21, the vehicle inner side wall 22 and the bottom wall 23 of the weather strip 10 are formed of the above-described rubber or a hard material of thermoplastic elastomer, and among them, EPDM rubber or olefin-based thermoplastic elastomer may be formed. preferable. The hardness is preferably made of a solid material or fine foam material having an IRHD (international rubber hardness) of 75 degrees or more and 100 degrees or less and an apparent specific gravity of 0.8 or more.
In this case, the trim portion 20 can be easily bent by following the curved portion of the flange 7.

Incidentally, when the IRHD (international rubber hardness) is less than 75 degrees, the rigidity of the trim part 20 as a whole is lowered and the force for holding the shape is reduced. When the IRDH exceeds 100 degrees, the rigidity of the trim part 20 is reduced. When the trim portion 20 is bent along the corner portion of the body (flange) at the time of mounting on the flange 7, the force becomes high.
Moreover, if the apparent specific gravity is less than 0.8, the rigidity of the trim part 20 as a whole is lowered, the force for holding the shape is reduced, and the force for holding the flange 7 is reduced. If the apparent specific gravity is 1.5 or more, the weight cannot be reduced sufficiently.

The vehicle interior side wall 22 is connected to the bottom wall 23 at a position closer to the front end side of the vehicle interior side wall 22 than the thickness of the bottom wall 23 and closer to the bottom wall 23 side than the center of the vehicle interior side wall 22. Side wall bent portions 22c are formed. Further, a vehicle outer side wall bent portion 21 c is formed at the same position on the vehicle outer side wall 21.
Therefore, the vehicle inner side wall 22 and the vehicle outer side wall 21 are bent at angles of β2 and β1 inside the trim portion 20 having a substantially U-shaped cross section at the bent portions 22c and 21c, respectively, and the front end portion of the vehicle inner side wall 22 is obtained. And the space | interval with the front-end | tip part of the vehicle outer side wall 21 is narrowed and formed. In the present embodiment, the angles β2 and β1 are 8 degrees. The angles β2 and β1 are preferably set in the range of 5 to 10 degrees.

Note that the front end portion of the vehicle interior side wall 22 and the front end portion of the vehicle exterior side wall 21 have a first vehicle inner flange holding lip 26 and a first vehicle outer flange holding lip 24, which will be described later, project from the portion with respect to the flange 7. It can be pressed strongly, the force to hold the flange 7 is increased, and the trim portion 20 can be prevented from coming off the flange 7 at the corner portion or the like.
In the present embodiment, the bent portions are formed on both side walls of the vehicle inner side wall 22 and the vehicle outer side wall 21, but the bent portions are formed only on the vehicle inner side wall 22, and the front end side portion of the vehicle inner side wall 22 is formed. It is also possible to have a shape in which the distance between the tip portions of the side walls 22 and 21 is narrowed by bending only.

On the inner surface of the vehicle outer side wall 21, the first vehicle outer side flange holding lip 24 and the second vehicle outer side flange holding lip are arranged in order from the front end side (opening side) to the front end side of the vehicle outer side wall bent portion 21c. 25 is formed in an obliquely upward direction toward the inside of the substantially U-shaped cross section (in the direction of the bottom wall 23), and a first vehicle inner flange holding lip 26 and a second vehicle inner flange holding lip are formed on the inner surface of the vehicle inner side wall 22. 27 is similarly formed.
The first vehicle outer flange holding lip 24 and the first vehicle inner flange holding lip 26 are formed so as to protrude from the respective side walls 21 and 22 at an angle of about 60 degrees, and the second vehicle outer flange holding lip 25 and the second vehicle inner flange holding lip 26 are projected. The flange holding lip 27 is formed so as to protrude from each of the side walls 21 and 22 at an angle of about 45 degrees.
1 is a water stop lip made of sponge rubber provided between the first and second vehicle outer side flange holding lips 24, 25.

  For this reason, when the flange 7 is inserted into the trim portion 20, the first vehicle outer side flange holding lip 24 and the second vehicle outer side flange holding lip 24 that are two each from both the vehicle outer side wall 21 and the vehicle inner side wall 22 are retained. The flange 7 can be stably held by the lip 25, the first vehicle inner flange holding lip 26, and the second vehicle inner flange holding lip 27.

  The front end of the second vehicle outer side flange holding lip 25 is positioned closer to the bottom wall 23 than the front end of the second vehicle inner side flange holding lip 27, and the front end of the second vehicle inner side flange holding lip 27 is the first vehicle outer side flange holding lip 27. 24 and the second vehicle outer side flange holding lip 25 so as to be positioned between them, and the second vehicle outer side and vehicle inner side flange holding lips 25 and 27 are formed so that the front ends thereof overlap each other in the vertical direction. ing.

The front end of the first vehicle outer side flange holding lip 24 is formed so as to substantially face the first vehicle inner side flange holding lip 26.
That is, the first vehicle outer side / inner side flange holding lips 24, 26 are formed shorter than the second vehicle outer side / inner side flange holding lips 25, 27, and the tips thereof are formed to overlap each other in the vertical direction. It has not been.
For this reason, in the flange holding lip having this arrangement, the insertion load when the trim portion 20 is inserted into the flange 7 can be reduced, and the removal load from the flange 7 can be increased.
Further, a first vehicle inner flange holding lip 26 and a second vehicle inner flange holding lip 27 are arranged between the first vehicle outer flange holding lip 24 and the second vehicle outer flange holding lip 25, and in particular, the trim portion. The second vehicle outer side flange holding lip 25 can be stretched against the flange 7 when the 20 rotates toward the vehicle inner side and can be prevented from falling down on the weather strip 10 to the vehicle inner side. .

  The vehicle outer side flange holding lips 24, 25 and the vehicle inner side flange holding lips 26, 27 are made of solid material, and the hardness thereof is lower than the hardness of the vehicle outer side wall 21, the vehicle inner side wall 22, and the bottom wall 23. It is preferable. In this case, the outer side wall 21, the inner side wall 22 and the bottom wall 23 firmly hold the substantially U-shaped cross section of the trim portion 20, and the outer flange holding lips 24, 25 and the inner flange holding lip 26. 27, the flange 7 can be flexibly brought into contact with the flange 7, and even if the surface of the flange 7 has irregularities, the flange 7 can be securely held and it can flexibly cope with the disconnection from the flange 7.

The vehicle outer flange holding lips 24, 25 and the vehicle inner flange holding lips 26, 27 are formed of a solid material, and the hardness thereof is 70 degrees IRHD (international rubber hardness).
In addition, IRHD (international rubber hardness) can be manufactured in a range of 65 degrees or more and less than 75 degrees. In this case, even if there is unevenness on the surface of the flange 7, it has sufficient flexibility to be able to flexibly contact the flange 7 and can have sufficient rigidity to hold the flange 7. .
Incidentally, when the angle is less than 65 degrees, the holding force of the flange 7 decreases, and when it exceeds 75 degrees, the insertion load when the trim portion 20 is inserted into the flange 7 increases.
In the weather strip 10 of the embodiment of the present invention having the above-described configuration, the insertion load to the flange 7 is about 22 N / 100 mm, and the removal load from the flange 7 is about 48 N / 100 mm. (Note that the maximum value of the unloading load is the same as that of the trim part having the structure described in Japanese Patent Application No. 2008-316526, but the lowering of the unloading load is more gradual in the structure of the present application. In contrast, the present application is better.)
Incidentally, the insertion load of the weather strip in which the conventional insert is embedded is about 16 N / 100 mm, and the removal load is about 42 N / 100 mm. Therefore, the weather strip 10 of the present invention has the same removal load as that of the conventional weather strip, the insertion load is small, the insertability to the flange 7 is good, and the holding force is sufficient.

A cover lip 30 is formed so as to protrude in the in-vehicle direction at a connecting portion between the vehicle inner side wall 22 and the bottom wall 23. The cover lip 30 is formed so that the outer surface thereof is flush with and continuous with the outer surface of the bottom wall 23, and the cross-sectional shape thereof is formed in a large curved arc shape.
Further, the base portion of the cover lip 30 is located closer to the bottom wall 23 than the vehicle interior side wall bent portion 22c. For this reason, the front end of the garnish G or the like attached in the vehicle can be covered with the cover lip 30, so that the appearance can be improved and the front end of the cover lip 30 can be brought into contact with the garnish G or the like attached in the vehicle. .
A solid material of the vehicle interior side wall 22 is partially extended on the inner surface of the base portion of the cover lip 30 to improve the rigidity of the base portion of the cover lip 30.

  For this reason, when the trim portion 20 of the weather strip 10 is attached to a portion where the thickness of the flange 7 of the body is thick, the vehicle interior side wall 22 of the trim portion 20 starts from the vehicle interior side wall bent portion 22c. Even when the side is bent and deformed, the cover lip 30 protrudes from a portion that does not affect the deformation, so that the tip of the cover lip 30 moves away from the abutting counterpart member such as garnish G. There will be no deterioration of the appearance or the sealing performance against sound or the like.

Further, in the first embodiment, a body seal lip 28 made of sponge rubber material is formed obliquely downward from the vicinity of the front end of the outer surface on the opening side of the vehicle outer side wall 21. Therefore, when the body seal lip 28 comes into contact with the peripheral edge 6 of the opening, the tip thereof can be brought into line contact, and the force pressed by the tip is large and the sealing property is good.
Accordingly, it is possible to prevent rainwater, dust, noise and the like from entering the passenger compartment from the trim portion 20 through the flange 7 from the opening periphery 6 and to seal between the opening periphery 6 and the weather strip 10. it can.

Further, since the body seal lip 28 is formed with substantially the same thickness from the base to the tip, the elasticity of the body seal lip 28 is improved when the tip of the body seal lip 28 comes into contact with the peripheral edge 6 of the opening, The force with which the front-end | tip presses the opening periphery 6 is strong, and a sealing performance is good.
The body seal lip 28 is formed of a sponge material. Therefore, the flexibility of the body seal lip 28 is increased, and the sealing performance can be ensured by following the unevenness and deformation of the peripheral edge 6 of the opening.

  Further, a sub-body seal lip 29 extends downward from the vicinity of the front end side (opening side) of the vehicle outer side wall 21. As shown in FIG. 1, the sub body seal lip 29 is formed in a straight line and is shorter and smaller than the body seal lip 28. Therefore, when the weather strip 10 is attached to the flange 7, the weather strip 10 abuts on a portion of the base portion of the flange 7 that communicates with the opening periphery 6.

Since the sub-body seal lip 29 is small and formed, the sub-body seal lip 29 can be deformed in close contact with the contact portion, and rainwater or the like that has passed between the body seal lip 28 and the opening peripheral edge 6 should be The sub-body seal lip 29 can surely prevent its entry, and can seal noise and the like, and the sealing performance can be further improved.
When the sub-body seal lip 29 is formed of a sponge material, the flexibility is improved and the sealing performance can be ensured by following the unevenness and deformation of the root of the flange 7.

  As shown in FIG. 1, a caulking member 50 may be provided on the inner surface of the bottom wall 23 of the trim portion 20. In this case, when the tip of the flange 7 is inserted into the caulking member 50, the rust prevention and sealing performance of the tip of the flange 7 can be improved.

  A hollow seal portion 40 is formed on the outer surface of the bottom wall 23 of the trim portion 20 so as to face upward. The hollow seal portion 40 is formed of a sponge material in a hollow shape whose cross section is substantially rhombus, oval or substantially circular. Since it is hollow and formed of a sponge material, it has flexibility, and when the back door 2 is closed, the hollow seal portion 40 is reliably deformed without being abnormally deformed compared to the lip shape. The back door 2 can be brought into contact with a predetermined position and sealed.

  Further, when the cross section of the hollow seal portion 40 is substantially rhombus or oval, when the tip of the hollow seal portion 40 abuts on the back door 2, the swelled portion of the central portion of the approximately rhombus or oval is bent and bent. And can be contacted flexibly.

  Sponge materials such as the hollow seal portion 40, the body seal lip 28, the sub body seal lip 29, the cover lip 30, and the water stop lip 51 are formed of a rubber foam having a specific gravity of 0.4. The sponge material can be formed of a rubber foam having a specific gravity in the range of 0.3 to 0.6. The sponge material of the water stop lip 51 may be a material having a specific gravity of 0.15 to 0.3. Since these portions are formed of a sponge material, the weight of the weather strip 10 can be reduced, and it is rich in elasticity and flexibility, and a sealing property can be ensured even when used for a long time.

  The hollow seal portion 40 is formed upward from the outer surface of the bottom wall 23. Since the connecting portion of the hollow seal portion 40 to the trim portion is formed of a solid material, the rigidity is high, the position of the hollow seal portion 40 is stable, and when the hollow seal portion 40 abuts against the back door 2, The abutting position is stable, and sealing performance can be secured.

Next, a second embodiment of the present invention will be described with reference to FIG.
2nd Embodiment is the weather strip 10 used for a side door opening part.
In the second embodiment, the position of the hollow seal portion 40 is different and the other parts are almost the same. Therefore, the description of the same parts is omitted, and different parts will be described.

In the second embodiment, the hollow seal portion 40 is formed to protrude from the vehicle outer side surface of the vehicle outer side wall 21 to the vehicle outer side, and the cross-sectional shape thereof is a substantially rhombus. That is, the seal wall of the hollow seal portion 40 protrudes directly from the vehicle outer side wall 21 of the trim portion 20. Since the cross-sectional shape is substantially rhombus, it can be bent at the bent portion of the seal wall of the hollow seal portion 40, has high flexibility, and can reliably contact according to the shape of the side door.
Also in the second embodiment, as in the first embodiment, the vehicle interior side wall 22 is formed with a vehicle interior side wall bent portion 22c, which is closer to the bottom wall 23 than the bent portion 22c. A cover lip 30 is formed on the top. However, the vehicle outer side wall 21 is not formed with the vehicle outer side wall bent portion 21c, and the vehicle outer side wall 21 is formed in a straight line. This is because the hollow seal portion 40 is formed on the outer surface of the vehicle outer side wall 21 and the position of the hollow seal portion 40 is stabilized.

A cover lip 30 is formed so as to protrude in the in-vehicle direction at a connecting portion between the vehicle inner side wall 22 and the bottom wall 23. As in the first embodiment, the cover lip 30 is formed so that the outer surface thereof is flush with and continuous with the outer surface of the bottom wall 23, and the cross-sectional shape thereof is formed in a largely curved arc shape. ing.
Further, the base portion of the cover lip 30 is located closer to the bottom wall 23 than the vehicle interior side wall bent portion 22c. Therefore, the tip of the garnish G or the like attached in the vehicle can be covered with the tip of the cover lip 30 to improve the appearance, and the tip of the cover lip 30 is brought into contact with the garnish G or the like attached in the vehicle. Can do.
A solid material of the vehicle interior side wall 22 is partially extended on the inner surface of the base portion of the cover lip 30 to improve the rigidity of the cover lip 30.

  In the molding of the weather strip 10 of the present invention, synthetic rubber and thermoplastic elastomer are used. For example, EPDM rubber can be used for synthetic rubber, and polyolefin-based elastomer can be used for thermoplastic elastomer. When EPDM rubber and olefinic thermoplastic elastomer are used, co-extrusion molding can be performed using the same type of material, and a product with good weather resistance can be obtained. Moreover, since it is the same olefin resin / rubber, it can be recycled without separation, and an easily recyclable product can be obtained.

The straight portion of the weather strip 10 is formed by an extruder and then cut into a predetermined length to be manufactured. The portion to be attached to the corner portion is formed by molding, and the straight portions are simultaneously connected by molding.
In the case of synthetic rubber, it is conveyed to a vulcanizing tank after extrusion and heated by hot air or high frequency to vulcanize. In the case of a thermoplastic elastomer, it is cooled and solidified.

  In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other application examples and modification examples not illustrated below are also possible.

  (A) In the first and second embodiments, the cover lip 30 is formed so as to be flush with the outer surface of the bottom wall 23. However, the position of the base portion of the cover lip 30 is set to the vehicle interior side wall bent portion 22c. If the cover lip 30 is formed so as to protrude from a position not affected by the deformation of the vehicle interior side wall 22, the outer surface of the cover lip 30 is not necessarily formed flush with the bottom wall 23.

  (B) Moreover, in each said embodiment, although the example of the weather strip 10 provided with the trim part 20 of the cross-sectional substantially U shape and the hollow seal part 40 was shown, the hollow seal part 40 is not provided. The above cover lip 30 may be applied to a weather strip having a trim or lip-shaped seal portion. In this case, the same effects as the first and second embodiments are achieved.

  (C) In each of the above embodiments, EPDM solid rubber is shown as the material of the trim portion 20, but an olefin-based thermoplastic elastomer may be used as the material.

1 Body 2 Opening / closing member (back door)
6 Opening peripheral edge 7 Flange 10 Weather strip 20 Trim part 21 Car outer side wall 21c Car outer side wall bent part 22 Car inner side wall 22c Car inner side wall bent part 23 Bottom wall 24 First car outer flange holding lip 25 Second car outer flange Holding lip 26 First car inner flange holding lip 27 Second car inner flange holding lip 30 Cover lip 40 Hollow seal part

Claims (2)

A trim part having a substantially U-shaped cross section, which is held by a flange at the periphery of the opening part of the body of the automobile and has a bottom wall connecting the vehicle inner side wall, the vehicle outer side wall and both side walls, and protrudes from the trim part. A trim part having a hollow seal part that is pressed against the periphery of the opening and closing member when the opening and closing member that opens and closes the part is closed, and a cover lip that protrudes from a side wall of the trim part and covers an edge of the interior member The vehicle outer side wall, the bottom wall and the vehicle inner side wall have a substantially U-shaped cross section, and a flange holding lip is extended from the inner surface of the vehicle outer side wall and the vehicle inner side wall inside the substantially U-shaped cross section. The side wall, bottom wall, and vehicle interior side wall are made of a hard material that is rubber or thermoplastic elastomer and has an IRHD (International Rubber Hardness) of 75 degrees or more and 100 degrees or less and an apparent specific gravity of 0.8 or more. Side wall corner And the outer surface of the corner portion of the bottom wall and the vehicle interior side wall are formed at an angle of 90 degrees or more and 100 degrees or less, and the curvature radius of the corner portion is formed at 0.2 mm or more and 2 mm or less. Alternatively, a bent portion is formed on the inner side wall of the vehicle on the tip side of each side wall relative to the thickness of the bottom wall and on the bottom wall side of the center of each side wall. A weather strip formed so that the front ends of the flange holding lips on the vehicle outer side and the vehicle inner side overlap each other in the vertical direction,
A weather strip, wherein a protruding position of a base portion of the cover lip is positioned between a bent portion of a side wall of the trim portion and a bottom wall of the trim portion.   The weather strip according to claim 1, wherein the upper surface of the cover lip is formed to be flush with the upper surface of the bottom wall of the trim portion.

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