JP3719094B2 - Weather strip for automobile door - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a weather strip attached to the outer periphery of an automobile door.
[0002]
[Prior art]
As shown in FIG. 6, weather strips 5 are continuously attached to the outer periphery of the front and rear doors 1 of the automobile, and when the door 1 is closed, a gap between the outer periphery of the door 1 and the door opening edge of the vehicle body is formed. Seal.
[0003]
FIG. 7 shows a cross-section of the portion of the weather strip 5 attached along the door frame 11. The weather strip 5 is made of a material having rubber-like elasticity, such as EPDM rubber or olefinic thermoplastic elastomer ( TPO), and includes a mounting base 51, a hollow main seal portion 52, and a lip-shaped sub seal portion 53. The sub seal part 53 extends from the mounting base 51 at a position outside the main seal part 52 and the front end side is bent in a substantially square shape in cross section in the vehicle outer direction.
[0004]
In general, the portion of the weather strip 5 attached to the periphery of the door body 10 (FIG. 6) is such that the sub-seal portion 53 is shortened and the tip thereof is in contact with the inner peripheral surface of the door body 10.
[0005]
When the door is closed, the weather strip 5 has its main seal portion 52 pressed against the door opening edge 20 around the door frame 11. On the other hand, the end of the sub seal part 53 enters the outer peripheral end surface 21 while being in sliding contact with the outer peripheral opening surface 21 of the door opening edge 20.
[0006]
By the way, in the door 1 to which the weather strip 5 is mounted, an abnormal noise is generated near the rear vertical frame portion of the door frame 11 along the center pillar 2A and the rear pillar 2B (FIG. 6) when the door is opened. There is. This abnormal noise will be explained with respect to the rear door 1. When the door opening operation is started, as shown in FIG. 8, the front end of the sub seal portion 53 contacting the door opening outer peripheral opening surface 21 of the rear pillar 2 B is caught. The sub-seal portion 53 bends without the tip separating from the outer peripheral opening surface 21, and when the door 1 is opened, the sub-sealed portion 53 is suddenly detached from the outer peripheral opening surface 21 due to the repulsive force and restored to its original shape. However, the abnormal noise is generated when the shape is restored.
[0007]
Therefore, as a measure for preventing the sub seal portion 53 from being caught, it has been proposed to attach a member for improving the sliding property of the tip of the sub seal portion 53 to the door opening outer peripheral opening surface 21 (Japanese Patent Laid-Open No. 11-334384). ). However, with this measure, another member must be attached, and there is a problem that the material and man-hours are expensive.
[0008]
As described above, the weather strip provided integrally with the hollow main seal portion and the lip-shaped sub-seal portion has been described. However, there is a seal structure around the door in which the hollow seal portion and the lip-shaped seal portion are provided separately. is there.
[0009]
FIG. 9 shows a typical example, in which a weather strip 6 integrally provided with a trim portion 60 and a hollow seal portion 61 is attached to the flange 23 at the door opening edge of the vehicle body. On the other hand, a weather strip 7 having a mounting base 72 and a lip-shaped sealing portion 73 having a square cross section is attached to a retainer 13 formed on the outer periphery of the door frame 11. When the door is closed, the seal portion 61 of the weather strip 6 is in pressure contact with the inner surface of the door frame 11, and the seal portion 73 of the weather strip 7 is in pressure contact with the door opening outer peripheral opening surface 21. The lip-shaped seal portion 73 of the weather strip 7 having such a structure has the same problem as described above.
[0010]
Further, instead of the weather strip 7, as shown in FIG. 10, there is the one 8 in which the mounting base 81 is made of a substantially non-foaming material and the sealing portion 83 is made of a foaming material. There's a problem.
[0011]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and without attaching a separate member to the door opening, the weather strip lip-shaped sub-seal part or the hook of the seal part at the time of the door opening operation, and to this The object is to prevent the generation of accompanying noise.
[0012]
[Means for Solving the Problems]
The present invention is a weather strip that is attached to the outer periphery of an automobile door, and includes an attachment base, a hollow main seal portion that bulges from the attachment base and presses against a door opening edge of a vehicle body when the door is closed, and a main seal portion. Also has a lip-shaped sub-seal part that extends upright from the mounting base on the outer side of the vehicle, bends and extends in a substantially square shape toward the outer side of the vehicle, and has a tip that presses against the outer peripheral opening surface of the opening edge when the door is closed. In the weather strip made of foam having a rubber seal elasticity, the weather strip attached to at least the rear vertical frame portion of the door frame of the weather strip is a bent-shaped bending point of the sub seal portion. The base portion in a range that does not reach is formed of a material harder than other portions of the sub seal portion (claim 1).
[0013]
The present invention also provides a weather strip that is attached to the outer periphery of an automobile door. The weather strip extends in an upright manner from the attachment base , bends in a substantially square shape toward the vehicle outer side, extends in the vehicle outer direction, and closes the door. A weather strip having a lip-shaped seal portion, the tip of which sometimes presses against the outer peripheral opening surface of the opening edge, wherein at least the seal portion is made of a foam having rubber-like elasticity. The weather strip attached to the rear vertical frame portion is formed of a material harder than other portions of the seal portion at the root portion of the seal portion in a range that does not reach the bent point of the square shape. Item 2).
[0014]
In the invention of claim 1 or 2, the root portion is formed of a non-foaming material (invention 3), or the root portion is made of a foam material having a lower expansion ratio than other portions of the sub seal portion or the seal portion. By forming (claim 4), rigidity is given to the root portion.
[0015]
The present invention pays attention to the fact that the deformation that occurs in each of the seal portions mainly occurs at the root portion when the door is opened in a state where the sub seal portion or the seal portion is caught on the outer peripheral opening surface of the door opening edge of the vehicle body. It was made. That is, as representatively shown in FIG. 8, when the door is opened with the tip of the sub-seal portion 53 being caught, the square-shaped tip portion of the sub-seal portion 53 does not reversely bend in the reverse direction. The root portion 531 of the portion 53 is bent, and the sub seal portion 53 is in a posture of falling toward the vehicle inner side. Based on this knowledge, the present invention provides rigidity by forming the lip-shaped sub-seal part or the base part of the seal part with a hard material, and when the door is opened, the seal part can be detached from the outer peripheral end face of the door opening without falling down. is there.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with respect to the rear door 1 (FIG. 6). As shown in FIG. 2, the weather strip 5 is an extrusion molding that is attached in a range from the upper horizontal frame portion facing the roof side of the door frame 11 (FIG. 6) to the rear vertical frame portion facing the rear pillar 2B. The weather strip 5A, the extruded weather strip 5B attached to the front vertical frame portion of the door frame 11, and the extruded weather strip 5C attached to the outer periphery of the door body 10 (FIG. 6) are molded. It is formed in a loop shape by connecting with the molding connecting portions 5D, 5E, and 5F.
[0017]
The weather strips 5A and 5B attached to the door frame 11 have the same cross-sectional shape, and as shown in FIG. 1 (A), an attachment base 51 fitted to a retainer 13 provided on the outer periphery of the door frame 11, and an attachment A hollow main seal portion 52 that swells obliquely upward from the base 51 toward the vehicle inner side, and a lip shape that extends upward from the mounting base 51 at a position in contact with the base end of the main seal portion 52 on the vehicle outer side. The sub seal part 53 is provided. The sub-seal portion 53 is bent in a substantially square shape in cross section toward the vehicle outer direction at an intermediate position. Reference numeral 530 indicates a bending point of the square shape.
[0018]
The weather strip 5B is entirely made of an EPDM rubber foam. On the other hand, the weather strip. 5A, the base portion 531 of the sub seal 53 are formed of EPDM non foam rubber (solid rubber) S _1, the other part is formed of a foam material of the same EPDM rubber as weatherstrip 5B ing. The formation range of the non-foaming material S _{1 is} a range in which the tip end side from the root end of the sub-seal portion 53 does not reach the character-shaped bending point 530 . In the illustrated example, the tip side is an intermediate position between the root end and the bending point 530 .
[0019]
Further, as shown in FIG. 1 (B), the lower half of the portion extending from the root end of the sub-seal portion 53 to the bending point 530 and the portion extending from the lower half to the vicinity of the bending point 530 along the side surface on the vehicle inner side are not covered. may be formed of a foam material S _1.
[0020]
Weather strip 5A is obtained by integrally extruding a foam and non-foam material S _1. The weather strip 5C attached to the outer periphery of the door body 10 (FIG. 6) is entirely made of EPDM rubber foam. The weather strip 5C does not include a sub-seal portion that contacts the door opening edge of the vehicle body.
[0021]
When the door 1 to which the weather strip 5 is mounted is closed, as shown by broken lines in FIGS. 1A and 1B, the sub-seal portion 53 of the weather strip 5A is bent further than the original shape and the tip is the door. It is in pressure contact with the opening surface of the opening edge outer peripheral opening surface 21. In the door opening operation, frictional resistance is inevitably generated between the end surface 21 and the tip of the sub seal portion 53. The frictional resistance is particularly large when sand or dust adheres to the end face 21.
[0022]
Due to this frictional resistance, the tip of the sub-seal part 53 is caught, and the bending force acts in the vehicle interior direction on the base part 531 of the sub-seal part 53 as the mounting base 51 side tries to move outward together with the door 1. Since the root portion 531 is formed of the non-foamed material S ₁ having high rigidity, it hardly bends. For this reason, the sub seal part 53 does not fall inside the vehicle, and the tip of the sub seal part 53 is pulled out from the door opening outer peripheral opening surface 21 as the door 1 moves. Immediately after being pulled out, the sub seal part 53 is restored to its original shape, but since the width of the restoring motion is small, no abnormal noise is generated.
[0023]
In the above embodiment, the root portion 531 of the sub seal lip 53 is formed of the non-foaming material S _1. However, as shown in FIG. 3, the root portion 531 is formed of the material S ₂ having a lower expansion ratio than other portions. Also good.
[0024]
The weather strip attached to the outer periphery of the door is usually made of foamed rubber or foamed TPO having a foaming ratio of about 40%. By forming the base portion of the weather strip with a material having a foaming ratio of about 20% or less and making the rigidity higher than that of other portions, substantially the same effect as the previous embodiment can be obtained. Weather strips having different expansion ratios at the base portion of the sub-seal portion and other portions can also be obtained by integral extrusion.
[0025]
FIG. 4 shows an embodiment in which the present invention is applied to the weather strip 7 shown in FIG. Weather strip 7A is the bending point 730 of the sealing portion 73 does not reach the root section 731 is Yes and formed of a non-foamed material S ₁ of EPDM rubber, the other part is formed of a foamed material EPDM rubber.
[0026]
FIG. 5 shows an embodiment in which the present invention is applied to the weather strip 8 shown in FIG. Weather strip 8A does not lead root portion 831 in the bending point 830 of the sealing portion 83 with the mounting base portion 81 is Yes forms a non-foamed material S ₁ of EPDM rubber and the other part is formed by foam material of EPDM rubber It is.
[0027]
Both weather strips 7A and 8A have the same operational effects as in the previous embodiment.
[0028]
There is a type of door frame of an automobile door in which a corner portion at the upper rear end has a right angle or a bending angle close thereto. In such a door frame, an extrusion-molded weather strip along the upper horizontal frame portion and an extrusion-molded weather strip along the rear vertical frame portion, which are separate from this, are connected at a molding corner portion. In such a door, the generation of noise can be prevented by forming the base portion of the sub seal portion of only the weather strip along the rear vertical frame portion with a hard material.
[0029]
【The invention's effect】
According to the present invention, the abnormal noise generated due to the deformation of the lip-shaped seal portion of the weather strip during the opening operation of the automobile door is sealed with the weather strip along at least the rear vertical frame portion of the door frame. It can prevent by forming the base part of a part with a hard material rather than another part. Since a weather strip partially made of a hard material is obtained by integral extrusion, it does not reduce the productivity of the weather strip or increase the cost. In addition, by making the base of the seal part hard, it prevents the seal part from falling into the vehicle interior due to water pressure during high-pressure car wash, so that water enters the retainer from between the seal part and the outer peripheral edge of the door frame. There is also an effect to prevent it.
[Brief description of the drawings]
1A is a sectional view of a first weather strip mounting state of the present invention at a position along the line IA-IA in FIG. 2, and FIG. 1B is a second weather strip of the present invention at the same position; It is an attachment state sectional view of a strip.
FIG. 2 is an overall view of a weather strip.
FIG. 3 is a cross-sectional view of the third weather strip of the present invention attached at a position along line IA-IA in FIG.
FIG. 4 is a sectional view of the fourth weather strip of the present invention attached at the same position as above.
FIG. 5 is a sectional view of the fifth weather strip of the present invention attached at the same position as above.
FIG. 6 is a side view of an automobile.
7 is a sectional view of a conventional weather strip attached in a position along the line VII-VII in FIG.
FIG. 8 is a view showing deformation that occurs when the door of the conventional weather strip shown in FIG. 7 is opened.
FIG. 9 is a sectional view of another conventional weather strip attached.
FIG. 10 is a sectional view of still another conventional weather strip.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Automobile door 10 Door main body 11 Door frame 2A Center pillar 2B Rear pillar 20 Door opening edge of vehicle body 21 Door opening edge outer peripheral opening surface 5, 5A, 7, 7A, 8, 8A Weather strip 51, 71, 81 Mounting base 52 Main Seal part 53 Sub seal part 73, 83 Seal part
530, 730, 830 Square-shaped bending points 531, 731, 831 Root portion S ₁ hard material (non-foam material)
S ₂ hard material (low expansion ratio material)

Claims (4)

A weather strip that is attached to the outer periphery of an automobile door (1) and has a mounting base (51) and a hollow main body that protrudes from the mounting base (51 ) and presses against a door opening edge (20) of the vehicle body when the door is closed. The seal part (52) and the main seal part (52) extend from the mounting base part (51) in an upright position on the vehicle outer side and bend and extend in a substantially rectangular shape toward the vehicle outer side. In a weather strip (5) comprising a lip-shaped sub-seal part (53) pressed against the outer peripheral opening surface (21) of (20) , wherein at least the sub-seal part (53) is made of a foam having rubber-like elasticity. of weather strip (5), a rear vertical frame portion weather strip attached to at least a door frame (11) (5A), the sub seal (53), the Ku-shaped bending point (530) Et no range of root portion (531), a weather strip for motor vehicle door, characterized in that formed of a hard material than other portions of the sub seal (53). A weather strip that is attached to the outer periphery of an automobile door, and is extended from the attachment base (71) and the attachment base (71) in an upright manner and bent in a substantially square shape toward the outside of the vehicle. A weather strip (7) comprising a lip-shaped seal portion (73 ) in pressure contact with the outer peripheral opening surface (21) of the opening edge (20) , wherein at least the seal portion (73) is made of a foam having rubber-like elasticity. In the weather strip (7) , at least the weather strip (7A) to be attached to the rear vertical frame portion of the door frame (11) is attached to the character- shaped bending point (730) of the seal portion (73). A weather strip for an automobile door, characterized in that a base portion (731) in an unreasonable range is formed of a material harder than other portions of the seal portion (73) . The root portion (531), the (731), non-foamed material (S ₁₎ motor vehicle door weather strip according to claim 1 or claim 2 formed by. The root portion (531), (731) is formed of a foam material (S ₂ ) having a lower expansion ratio than other portions of the weather strip (5A, 7A). Weather strip for automobile door as described.

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