JP2003182374A - Weather strip for car door - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weather strip for a car door which reduces a door closing sound when a door is closed without impairing a sealing performance. <P>SOLUTION: In a door weather strip 7 which is made of EPDM sponge rubber with a specific gravity ranging 0.4-0.8 and the base part 13 of which is slackly fit to a sash 11 having a space, low-density sponge layers 5, 8 with a specific gravity ranging 0.1-0.3 are formed in an integral construction at a point where a backside lip 15 sealing a gap between a frame 14 of the door rim contacts with the frame 14 and at a point where the base part 13 is in contact with the sash bottom face when a door is closed. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door weather strip attached to the periphery of a door of an automobile.

[0002]

2. Description of the Related Art An automobile door is of a type in which a frame having a portion on a belt line BL formed by sheet metal processing is connected to an inner panel under the belt line BL by welding. There is an outer panel integrally formed and an inner panel assembled to the outer panel, and there is a type in which a retainer is welded and attached to the inner panel on the belt line BL. The door weather strip is usually attached by attaching a clip to the inner panel below the belt line BL and pushing it into a sash or a retainer above the belt line BL to fit it.

Also, in the former type of sash, a type in which the base portion of the weather strip can be fitted tightly to the sash without any gap, and FIG.
There is a type in which the sash 11 is formed in a large size with a margin, and the base portion 13 of the door weather strip 12 is loosely assembled as shown in FIG.

[0004]

The latter type of loosening described above is easy to assemble, but on the other hand, the base portion 13 of the door weather strip 12 fitted in the sash 11 with a margin is accompanied by opening and closing of the door. To move in the sash. That is, when the door is opened, the base portion 13 generally floats from the sash bottom surface and the back lip 15 floats from the frame 14 as shown in FIG. 4, but when the door is closed from this state, FIG. As shown, the base portion 13 hits the bottom surface of the sash 11 and the frame 1
The rear lip 15 that seals between the contact holes 4 and 4 hits the frame 14 to generate a tapping sound, which is one of the causes of the door closing sound when the door is closed. Such a door closing sound similarly occurs in the retainer when the retainer is loosely assembled to the base retainer.

As a measure against the above-mentioned door closing noise, it is conceivable to reduce the high-frequency sound pressure generated by using one having a low hardness. Therefore, the rear lip 15 or the door weather strip shown in FIG. A low high-foam sponge material may be used, but in this case, the repulsive force after the door is closed and the high-foam sponge is distorted is reduced, and as a result, the sealing pressure of the hollow seal portion 16 is reduced and the sealing property Will be damaged.

An object of the present invention is to provide a door weather strip capable of reducing the door closing sound without impairing the sealing property.

[0007]

SUMMARY OF THE INVENTION The present invention is a door weather strip that is attached to the periphery of a door of an automobile, and has a hollow seal portion that elastically contacts and seals a body panel on the periphery of the door opening when the door is closed, and a periphery portion of the door. Has a back lip that seals between the base attached to the frame and the frame or panel around the door. The base is loosely fitted to the sash or the retainer with a gap, and is movable within the gap when opening and closing the door. Places where tapping sound is generated when the door is closed, such as hitting the sash or the bottom of the retainer at the bottom, hitting the back lip to the frame or panel, and preferably at all. A high-foam sponge layer is provided at the location.

According to the weather strip of the present invention, the high-foam sponge layer serves as a cushioning material to reduce the tapping sound generated when the door is closed and the weather strip hits the frame or panel.

Further, since the frame having the sash is generally welded at the belt line BL with the inner panel partially overlapped with each other, a step is formed at the connecting portion, and the retainer is also fixed on the belt line BL. BL
As a result, the high foam sponge layer absorbs the step, and the sealing property is improved as compared with the conventional product in which the high foam sponge layer is not provided.

Since the weather strip itself is made of the same material as the conventional one, for example, EPDM sponge rubber having a specific gravity of 0.4 to 0.8 is used, the repulsion when the door is closed is higher than that of the conventional product. The force does not decrease and the sealing performance is not impaired.

The high-foam sponge layer used in the present invention is a soft EP having a specific gravity of about 0.1 to 0.3, for example.
The high-foam sponge layer, which is made of DM sponge, may be provided only in a portion that produces a tapping sound when the door is closed. Good. Therefore, the location where the high-foam sponge layer is provided is not limited to the location where the tapping sound is generated.

By providing the high-foam sponge layer, the high-foam sponge layer comes into contact with the frame or panel when the door is closed, but the contact surface of the high-foam sponge layer against the frame or panel is large. Is desirable. This is because when the contact surface becomes large, the high-frequency sound pressure that is the cause of the tapping sound is reduced.

In another preferred invention, the high foam sponge layer is coextruded with the weatherstrip.
As a result, a highly foamed sponge layer integrated with the weather strip can be obtained in one step.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the figure, the same structures as those shown in FIGS. 4 and 5 are indicated by the same reference numerals. The door weather strip 1 shown in FIG.
The layer 2 made of EPDM high-foam sponge rubber having a specific gravity of about 0.1 to 0.3 is formed integrally with the other part by co-extrusion at the contact part 4 with the specific gravity of the other part of 0.4. It is made of EPDM sponge rubber of about 0.8. In the figure, 16 is a body panel 1 when the door is closed.
7 is a hollow seal portion that elastically contacts and seals.

FIG. 1 shows a state in which the door is opened. When the door is closed in this state, the back lip 15 has a sponge rubber layer 2 interposed between the back lip 15 and the frame 14 as a cushioning material, and the back lip is closed. The tapping sound when 15 hits the frame 14 is not generated or is reduced. Also the base 1
The contact of 3 with the bottom surface of the sash is also alleviated by the displacement being absorbed by the sponge rubber layer 2. Further, in the belt line BL, a step generated at the connecting portion between the frame 14 and the inner panel below the belt line is formed.
Is absorbed, and the sealing property at this portion is improved, so that water leakage and sound leakage can be prevented.

Since the weather strip itself is made of EPDM sponge rubber having a specific gravity of about 0.4 to 0.8, the repulsive force when the door is closed is lower than that of the conventional one. It does not occur, and the sealing property with the body panel is not impaired.

The weather strip 4 shown in FIG. 2 has a specific gravity of 0.1 to 0.
The EPDM sponge rubber layer 5 of about 3 is integrally molded. In the weather strip of this embodiment, when the door is closed, the frame 1 of the sponge rubber layer 5 is
By increasing the hitting area on No. 4, the high-frequency sound pressure, which is the cause of the hitting sound, is further reduced, and the hitting sound is reduced.

In the weather strip 7 shown in FIG. 3, the EPDM sponge rubber layer 5 is integrally formed on the entire surface of the back lip 15 as in the weather strip shown in FIG. 2, and at the contact portion of the base portion 13 with the sash bottom surface. Specific gravity 0.
The EPDM sponge rubber layer 8 of about 1 to 0.3 is integrally molded.

In the case of this embodiment, not only the effect of providing the sponge rubber layer 5 on the entire back lip but also the hitting sound by the contact portion of the bottom portion with the bottom surface of the sash is not generated.
Or it is reduced. Further, the step on the belt line BL can be similarly absorbed.

Although the weather strips of the above-described embodiments are examples in which they are attached to the sash, when the retainer is loosely attached in consideration of the assemblability, the weather strip is the same. Composed.

[0021]

According to the door weather strip of the invention of claim 1, the high-foam sponge layer serves as a cushioning material because the high-foam sponge layer is provided at a position where a tapping sound is generated when the door is closed. It is possible to reduce noise, and by providing the high-foam sponge layer on the belt line BL, it is possible to absorb the step difference on the belt line BL and improve the sealing property at the step portion. The weather strip itself is made of the same material as before,
The provision of the high-foam sponge layer does not impair the repulsive force when the door is closed, so that the sealing performance is not impaired due to the decrease in the sealing pressure.

According to the second aspect of the invention, the highly foamed sponge layer integrated with the weather strip can be obtained in one step.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a door weather strip according to the present invention attached to a sash.

FIG. 2 is a sectional view of another example of a door weather strip.

FIG. 3 is a sectional view of still another example of the door weather strip.

FIG. 4 is a sectional view of a conventional door weather strip.

FIG. 5 is a sectional view of the door weather strip when the door is closed.

[Explanation of symbols]

1, 4, 7, 12 ... Door weather strip 2, 5, 8 ... Highly foamed sponge rubber layer 11 ... Sash 13 ... Base 14 ... Frame 15. Back lip 16 ... Hollow seal 17. Body panel

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Claims (2)

[Claims] 1. A hollow seal portion 16 for elastically contacting and sealing a body panel 17 at the periphery of a door opening when the door is closed, a base portion 13 attached to the periphery of the door, and a frame 14 or a panel at the periphery of the door. Back lip 1 to seal the space
5, the base portion 13 is loosely fitted to the sash 11 or the retainer provided at the peripheral portion of the door with a gap, and the base portion is movable in the sash 11 or the retainer when the door is opened and closed. In a door weather strip of an automobile, at least one of a contact portion of the base portion 13 against the sash 11 or the bottom surface of the retainer and a contact portion of the rear lip 15 against the frame 14 or the panel is used to reduce the hitting sound when the door is closed. A door weather strip comprising high foam sponge layers 2, 5, and 8. 2. The door weather strip according to claim 1, wherein the high-foam sponge layers 2, 5, 8 are co-extruded with the weather strips 1, 4, 7.