JPH1053076A - Manufacture of weatherstrip for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid water leak caused by a corner fall of a seal part without inserting packing in the seal part by changing the protruding shape of the seal part arranged at the corner part by bending after extrusion. SOLUTION: Bending is performed in such a way as to arrange a neck part 18 in proximity to a left bent part 12a by shifting the positions of the bent part 12a and a bent part 12b provided in two places of a fitting part 12. A protruding angle of a seal part 14 from the fitting part 12 thereby becomes and angle α in relation to a protruding angle in a straight part (seal part shape 14' in the straight part) so as to form such shape as to fall onto the bent outside of a corner part. The seal part 14 at the corner part is raised inward by the force that works toward the bent inside of the corner part at the time of being mounted on a vehicle so as to be almost equal to the shape in the straight part. Insufficiency of sealing at the corner part is thereby avoided so as to avoid water leak caused by a corner fall of the seal part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a weather strip to be mounted on a door opening of a trunk portion of a motor vehicle or a door for getting on and off the vehicle.

[0002]

2. Description of the Related Art A conventional weather strip for an automobile will be described with reference to an example of a weather strip 100 mounted on a door opening 2 of a trunk portion of an automobile 1 shown in FIG.

[0003] The weather strip 100 is mounted over the entire periphery of the door opening 2, and as shown in FIG. 9, a mounting portion 101 having a substantially inverted U-shaped cross section is mounted on the body flange 3. A hollow sealing portion 102 which is formed to project from the top of the mounting portion 101 in the sealing direction and abuts on the peripheral portion of the door 4.
Has an insert metal 103 embedded therein. At the time of manufacturing, the weather strip 100 has
It is extruded in a flat shape from an extrusion die together with the insert metal 103, and is usually formed into the above-mentioned inverted U shape by performing a bending process after being vulcanized and formed.

[0004]

Conventionally, when such a weatherstrip 100 is mounted on the door opening 2, it is applied to the corners thereof, particularly the corners 5 and 5 on the door hinge side located on the upper surface of the trunk. There is a problem that the seal portion 102 is displaced in a specific direction by the force, and the sealing performance is impaired. That is, at the corners 5 and 5 on the door hinge side of the door opening 2, the seal 102 falls down inside the bends of the corners 5 and 5 (the state of 102 ′ in FIG. 9). There is a problem that water leakage may occur due to insufficient sealing force.

Therefore, conventionally, in order to solve such a shortage of the sealing force due to the falling of the sealing portion 102, a filling 104 such as a latex sponge is inserted into the sealing portion 102 as shown in FIG. When the padding 104 is inserted into the device, there is a problem that the cost increases because the material and the number of manufacturing steps increase.

Accordingly, an object of the present invention is to provide a method of manufacturing a weather strip for an automobile, which can secure sufficient sealing performance at a corner portion while suppressing an increase in cost.

[0007]

According to the present invention, there is provided a method of manufacturing a weather strip for a vehicle, comprising: a mounting portion having a substantially inverted U-shaped cross section which is mounted on a body flange of a door opening of the vehicle; A method of manufacturing a weather strip, comprising: a hollow seal portion formed and abutting on a door, wherein the mounting portion is extruded in a flat shape and formed into the substantially inverted U shape by bending after extrusion. Wherein the bending shape of the mounting portion is changed by the bending to change the protruding shape of the seal portion.

[0008] In the above method, the mounting portion, which is provided with the seal portion protruding and extruded in a flat shape, is used to change the bending shape of the mounting portion in the bending process after the extrusion, that is, for example, the bending position and bending angle of the mounting portion. Changes the shape of the protrusion of the seal portion. This is because the top portion of the mounting portion where the seal portion is formed is formed by bending, so that if the shape such as the formation position or angle of the top portion is changed, the protrusion shape of the seal portion changes accordingly. That's why. As described above, since the protruding shape of the seal portion is changed by changing the bent shape of the mounting portion, in the corner portion where the seal portion falls down inside the bend when the vehicle is mounted,
The seal portion can easily be formed in a shape that allows for this falling, that is, a shape that is previously folded in the opposite direction to the falling. The seal portion which is formed in a shape falling in the opposite direction is raised inside by the force acting toward the inside of the bent portion of the corner portion when the vehicle is mounted, and is substantially the same as the original shape, that is, almost the same shape as the straight portion. Therefore, sufficient sealing performance at the corner portion is ensured.

In the above, the sealing portion of the weather strip disposed at least in one of the corner portions when not mounted on the vehicle has a shape in which the sealing portion is bent outward of the bent corner portion. It is preferable to change the protruding shape. In the corner portion where the seal portion falls down inside the bend at the time of mounting as described above, by performing the bending process after the extrusion so that the seal portion has a shape that falls down to the outside of the bend of the corner portion in an unmounted state, the seal is formed. When the vehicle is mounted on the vehicle, the portion is raised to its original shape by a force that tends to fall inside the bent portion of the corner portion, and sufficient sealing performance at the corner portion is ensured.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial perspective view of a weather strip 10 for an automobile according to an embodiment of the present invention when the weather strip 10 is mounted on a vehicle.

The weather strip 10 is mounted on the door opening 2 of the trunk of the automobile 1 shown in FIG.
One string-shaped extruded material extruded by a series of extrusion molding is connected to both ends to form an annular shape, and is formed integrally over the entire periphery of the door opening 2.

As shown in FIG. 1, the weather strip 10
Includes a mounting portion 12 having a substantially inverted U-shaped cross section which is mounted on the body flange 3, and a hollow sealing portion 14 formed so as to protrude in the sealing direction from the top of the mounting portion 12 and abut on the peripheral edge of the door 4. Become. The mounting portion 12 is made of solid rubber, and has an insert metal 16 embedded therein.
On the other hand, the seal portion 14 is formed of sponge rubber.

The mounting portion 12 having a substantially inverted U-shaped cross section has a horizontal top portion on which a seal portion 14 is protruded, and a pair of lower portions extending from both ends to the outside and the inside of the body flange 3. And a foot portion. A seal lip 20 made of sponge rubber is formed outward and downward at the lower end of the outer foot.

A lip 2 for holding the body flange 3 is provided on the inner peripheral surface of the mounting portion 12, that is, on the opposing surface of the pair of feet.
2 are formed to protrude inward and slightly upward. Two lips 22 on the outer foot and three on the inner foot
And the inner foot is provided one more than the outer foot. They are staggered so as to protrude alternately.

The seal portion 14 is connected to the mounting portion 12 via a neck portion 18 arranged substantially at the center of the top of the mounting portion 12.

When manufacturing the weather strip 10, the mounting portion 12 is extruded together with the insert metal 16 from an extrusion die (not shown) in a flat shape shown in FIG. Thereafter, the vulcanized product is put into a bending process. The bending step is a step of bending the flat mounting portion 12 into a substantially inverted U-shaped cross section. As shown in FIG. 2, the lower surface of the mounting portion 12 is supported by the support means 30 that supports and runs the weather strip 10. While operating, the bending rollers 32, 32 that press both sides of the mounting portion 12 are operated to bend the mounting portion 12 into a substantially inverted U-shaped cross section.

In the straight portion S of the weather strip 10 disposed on the straight portion of the body flange 3, FIG.
As shown in (a), the bending process is performed so that the sealing portion 14 protruding from the top of the mounting portion 12 is located at the center of the top. That is, the bending process is performed by bending the mounting portion 12 at two bending portions 12a and 12b, and the sealing portion 14 is provided substantially at the center of the flat top formed between the two bending portions 12a and 12b. In such a manner that the neck 18 connecting the two is located. At this time, the lip 22
Are arranged to protrude alternately as described above.

At the corner C (see FIG. 1) of the weatherstrip 10 disposed at the corners 5 and 5 of the door opening 2 on the door hinge side, as shown in FIG. The bending process is performed so that 14 has a shape that falls down outside the bent portion of the corner portion C. In other words, by shifting the positions of the two bent portions 12a and 12b of the mounting portion 12 to the right in FIG. 2, the neck portion 18 approaches the left bent portion 12a (that is, the bent outer side of the corner portion C). Bending is performed so as to be arranged. As a result, as shown in FIG. 3B, the protrusion angle of the seal portion 14 with respect to the mounting portion 12 is larger than the protrusion angle of the straight portion S (in the figure, the shape of the seal portion at the straight portion S is indicated by 14 '). .), And has an angle of α and falls down to the outside of the bend of the corner portion C. Such a fall α
Indicates the shape of the seal portion when the vehicle is mounted on the straight portion S.
5 ° to 20 ° to make the shape of the seal part almost the same
It is preferred that

As described above, at the corner portion C, the seal portion 1 is formed.
In order to change the protruding angle of the fourth portion 4 from the protruding angle of the straight portion S, the position of the weather strip 10 to be fed into the bending process is slid, and the bending rollers 32, 32 are slid left and right in FIG. Let me do
This can be performed by changing the positions of the bent portions 12a and 12b. At this time, it is preferable to change the positions of the bent portions 12a and 12b so that the neck portion 18 partially overlaps the bent portion 12a. The bending rollers 32, 32
Is appropriately operated to change the bending angle of both bending portions 12a and 12b, thereby changing the projection angle.

As shown in FIG. 3B, this corner portion C
Since the positions of the bent portions 12a and 12b are changed from the positions of the straight portions S, the lengths of the pair of feet of the mounting portion 12 having the same length in the straight portions S are different. doing. That is, the inner foot is shorter than the outer foot. Accordingly, the arrangement of the lip 22 between the pair of feet is different from the arrangement of the straight portion S. That is, the corner portion C
Here, the lower two lips 22, 22 of the inner foot are arranged so as to face the two lips 22 of the outer foot. Thus, in the corner portion C, the mounting portion 1
By changing the position where the fold 2 is bent, the lengths of the inner and outer feet are different, and accordingly the arrangement of the lip 22 provided on the feet is changed. By providing one more lip 22 and arranging them so as to protrude alternately, it is possible to secure the holding performance of the lip 22 even at the corner portion C.

As shown in FIG. 4, the seal portion 14 at the corner portion C is raised inside by the force acting on the inside of the corner portion C when it is mounted on the vehicle, and has substantially the same shape as the straight portion S. Becomes Thereby, sufficient sealing performance at the corner portion C is secured, that is, insufficient sealing force at the corner portion C can be avoided, so that water leakage due to falling of the seal portion 14 at the corner can be avoided.

According to the method of manufacturing the weather strip 10 described above, the angle of projection of the seal portion 14 with respect to the mounting portion 12 is changed by changing the bent shape of the mounting portion 12, so that the sealing portion 14 is mounted when the vehicle is mounted. In the corner portion C where the inner portion falls down inside the bend,
Can easily be formed in a shape that allows for this falling, that is, a shape that has fallen in advance to the outside of the bend of the corner portion C in advance. Therefore, the filling 1 is added to the sealing portion 14 as in the conventional case.
It is possible to avoid water leakage due to falling of the corner of the seal portion 14 without inserting the 04, thereby ensuring sufficient sealing performance at the corner portion C at low cost.

Since the length of the pair of foot portions of the mounting portion 12 is different at the corner portion C, the lower end of the inner foot portion at the corner portion C has the straight portion S.
And a slight step is generated at the lower end of the mounting portion 12, but such a step is normally hidden by the garnish 6 arranged on the inner peripheral side of the body flange 3, so that there is no problem in appearance.

In the above description, the shape of the seal portion 14 is changed at the corner portions 5 and 5 of the door opening portion 2 on the door hinge portion side. The present invention is also applicable to the corner portions of the above.

In the above description, the corner portion of the door opening 2 is bent so as to protrude outward. However, as shown in FIG. The present invention can also be applied to the corner portions 7 and 7 which are bent so that they protrude inward. Also in this case, at the corner portion C of the weather strip 10 disposed at the corner portions 7, 7, the seal portion 14 is bent to the attachment portion 12 so as to have a shape that is bent outward of the corner portion C. Apply processing.

That is, as shown in FIG. 5, FIG.
If the bending process is performed so that the seal portion 14 is inclined in the opposite direction to the shape shown in FIG. 7, the seal portion 14 is inclined outward of the corner portion C. Such a bending process is performed by shifting the positions of the two bent portions 12a and 12b of the mounting portion 12 to the left in FIG. 2 so that the neck portion 18 is arranged close to the right bent portion 12b. Good.

As described above, by appropriately changing the bent shape of the mounting portion 12, the projection angle of the seal portion 14 can be easily changed by one extruded product, and the entire opening perimeter of the door opening 2 can be changed. Even when various seal portions 14 are required, the shape can be easily changed to a square shape. Further, the shape of the seal portion can be changed without using so-called gradual extrusion in which the shape of the seal portion is gradually changed at the time of extrusion from the extrusion die, so that the cost is low.

FIG. 6 shows a cross section of an automobile weather strip 50 according to another embodiment of the present invention. In the weather strip 50, the configuration of the lip 22 is different from that of the weather strip 10 described above.

In this weather strip 50, FIG.
As shown in (a), two lips 22 are provided opposite each other on both feet of the mounting portion 12, and the lower lip 22 a of the inner foot is connected to the other lips 22, 22, 22. 2
It has a thickness of up to three times. As a result, as shown in FIG. 6B, even when the bending position is changed at the corner portion C and the arrangement of the lips 22 on both feet is displaced, the pair of lower lips 22, 22a have the above relative positions. State is maintained.

In the weather strip 50, as shown in FIG. 7, the seal portion 14 which is formed in the corner portion C in such a manner that the seal portion 14 is previously bent to the outside of the bent portion of the corner portion C is bent when the vehicle is mounted. Raised inward, it has almost the same shape as the straight portion S.

[0032]

According to the method for manufacturing a weather strip for an automobile of the present invention, since the protruding shape of the seal portion arranged at the corner portion is changed by bending after extrusion, sufficient sealing performance at the corner portion is obtained. Therefore, it is possible to avoid water leakage due to falling of the corner of the seal portion without inserting a padding into the seal portion as in the related art. That is, it is possible to secure sufficient sealing performance at the corner of the door opening while suppressing an increase in manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a partial perspective view of an automobile weather strip 10 according to an embodiment of the present invention when mounted on a vehicle.

FIG. 2 is a cross-sectional view of the weather strip 10 in a bending step.

FIG. 3A is a cross-sectional view of a straight portion S of the weather strip 10, and FIG.
FIG. 7 is a cross-sectional view at a corner C of No. 0.

FIG. 4 is a cross-sectional view of the corner portion C of the weather strip 10 when the vehicle is mounted on the vehicle.

FIG. 5 is a cross-sectional view showing another bending example of the weather strip 10.

FIG. 6 is a cross-sectional view of a weather strip 50 according to another embodiment of the present invention.
(B) shows the shape of the corner portion C.

FIG. 7 is a sectional view of a corner portion C of the weather strip 50 when the vehicle is mounted on the vehicle.

FIG. 8 is a partial perspective view of an automobile 1 showing a conventional weather strip 100 mounted on a vehicle.

FIG. 9 is a cross-sectional view when a conventional weather strip 100 is mounted on a vehicle.

FIG. 10 is a cross-sectional view showing a state in which a padding 104 is inserted into a seal portion 102 in a conventional weather strip 100.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Automobile 2 ... Door opening 3 ... Body flange 5 ... Corner part on door hinge side of door opening 10,50 ... Weather strip 12 ... Mounting part 14 ... Seal part C ... Weather Strip corner S: Straight part of weather strip

Claims (2)

[Claims] 1. A vehicle comprising: a mounting portion having a substantially inverted U-shaped cross section which is mounted on a body flange of a door opening of an automobile; and a hollow seal portion protruding from the top of the mounting portion and abutting on a door. A method of manufacturing a weather strip in which the mounting portion is extruded in a flat shape and formed into the substantially inverted U shape by bending after extrusion, by changing a bending shape of the mounting portion in the bending process. And a method of manufacturing a weather strip for an automobile, wherein the shape of the projection is changed. 2. At least 1 when not mounted on a vehicle.
2. The automotive vehicle according to claim 1, wherein the shape of the sealing portion is changed so that the sealing portion of the weather strip disposed at the corner portion has a shape that falls down outside the bent portion of the corner portion. Manufacturing method of weather strip.