JPH06219222A - Door lower molding - Google Patents

Abstract

PURPOSE:To provide a door lower molding in which surface paint film is not affected by a seal lap amount during a door closing. CONSTITUTION:A molding main body 11 is formed of an olefin group resin material as a hard resin material while a lower side lip part 15 is formed into double layer structure consisting of a hard part 15a made of a similar hard material and a soft part 15b made of a styrene group resin material, and the base end part of the soft part 15 is made as a hinge part 15c while the point end part is made as a seal part. Therefore, conventional paint can be used even though the whole of the door molding is resinified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door lower molding, and more particularly to a door lower molding which is fixed along a lower end of a vehicle door to close a gap between the door and a body.

[0002]

As a conventional door lower molding of this type,
The technique shown in FIG. 3 can be mentioned. FIG. 3 is a sectional view of a conventional door lower molding.

The conventional door lower molding 50 shown in the figure is of an external type fixed to the outside of the lower end of the door, and its molding body 51 is made of a two-layer extrusion molding and is made of stainless steel (SUS). The periphery of the insert 52 is covered with a skin portion 53 made of polyvinyl chloride (PVC) as a soft resin material to have a substantially flat plate shape. A plurality of clips 54 are embedded and fixed on the back surface side (door panel 1 side) of the insert 52 at intervals in the longitudinal direction, and the door lower molding 50 can be fixed along the lower end of the door panel 1 via the clips 54. At the lower end of the molding body 51, a seal lip 55 made of polyvinyl chloride is formed integrally with the skin portion 53 by extrusion in the entire longitudinal direction.

Further, the molding body 5 of the door lower molding 50
1 and the surface of the seal lip 55 are required to be colored in a predetermined color in order to impart a design effect, and as a surface treatment thereof, in addition to painting, a pigment is mixed with a resin material for molding the door lower molding 50, and extrusion molding is performed. There is a coloring material on the surface skin portion 53 of the molding main body 51 or the seal lip 55 itself as a product. Here, in consideration of the deterioration of the resin material due to sunlight or the like, the dressing is limited to a black color such as black or dark gray. Therefore, especially in a luxury car or the like, the entire body of the door lower molding 50 is When it is required to impart a high-class appearance to the same color as the color, coating is generally used.

The conventional door lower molding 50 configured as described above is fixed along the lower end of the door panel 1 via the clip 54 on the back surface of the molding body 51, and the tip of the seal lip 55 is closed when the door is closed. The outer surface of the rocker molding 2 below the door panel 1 is elastically abutted to shield the gap between the door panel 1 and the rocker molding 2, while the coloring applied to the entire door lower molding 50 imparts a unique design effect. To do. At this time, seal lip 5
Since 5 is entirely formed of polyvinyl chloride which is a soft resin material, the overlapping length between the tip of the seal lip 55 and the surface of the rocker molding 2 when the door is closed (hereinafter,
"The amount of the seal wrap"), the vicinity of the tip portion is bent outward to absorb the amount of the seal wrap. As a result, the tip of the seal lip 55 is brought into close contact with the outer surface of the rocker molding 2 to exert a sealing function, and foreign matter such as mud or raindrops outside the vehicle is prevented from entering into the vehicle through the gap between the door and the rocker molding 2. .

[0006]

On the other hand, due to the recent growing interest in environmental protection and resource saving, automobile parts also tend to be made entirely of resin in consideration of weight reduction and recyclability. It has been proposed that the material be replaced by stainless steel and polyvinyl chloride resin by, for example, an olefin resin material as a hard resin material and a styrene resin material as a soft resin material.

Here, when a styrene resin material is used instead of polyvinyl chloride as the soft resin material forming the seal lip of the door lower molding and the surface is coated, the same as in the case of the prior art of FIG. In addition, the seal lip is bent outward by the amount of the seal wrap. However, with respect to styrene resin materials, the development of a paint that colors the door lower molding by painting, that is, what is called a paint specification, that is, softening of a paint that can follow the shape change of the seal lip surface, has been delayed. Therefore, in the current surface coating with the coating material, the surface coating material cannot follow the shape change of the seal lip, and wrinkles or cracks are formed in the coating film. On the other hand, the seal lip 5 of the door lower molding 50
In the prior art in which polyvinyl chloride is used as the soft resin material forming No. 5, there is a paint that can be applied to the surface of the polyvinyl chloride forming the seal lip 55 and that follows the shape change of the seal lip 55. However, polyvinyl chloride is insufficient particularly in terms of strength and shape maintenance of the molding body 51.

Therefore, an object of the present invention is to provide a door lower molding in which the coating film on the surface is not affected by the amount of seal wrap when the door is closed.

[0009]

In the door lower molding according to the present invention, a molding body fixed along the lower end of the door is formed of a hard resin material, and a hard portion made of a hard resin material extending downward is formed on the molding body. Extending in the longitudinal direction, in the longitudinal direction of the boundary portion between the molding body and the hard portion, a hinge portion made of a soft resin material that allows tilting in the thickness direction of the hard portion is extended, A seal portion is integrally formed on the body side of the hard portion when the door is closed.

[0010]

In the present invention, when the door is closed, the seal portion on the body side of the hard portion adheres to the body side to exert a sealing function, and the hard portion is thicker than the molding body via the hinge portion. It tilts in the vertical direction and absorbs the seal wrap amount which is the overlapping length with the body. At this time, since the hard portion is formed of a hard resin material, and the whole tilts,
Does not elastically deform as the amount of seal wrap is absorbed,
The surface does not change its shape. As a result, when the surface of the hard portion serving as the design surface is coated, the surface of the hard portion is not deformed such as curved, and the coating film is not cracked.

[0011]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 is a sectional view of a door lower molding according to an embodiment of the present invention, and FIG. 2 is a main portion sectional view showing a hinge portion of a door lower molding according to an embodiment of the present invention.

It should be noted that, in the drawings, the same reference numerals and symbols as those of the conventional example indicate the same or corresponding parts as those of the conventional example, and therefore, redundant description will be omitted.

As shown in the figure, the door lower molding 10 of one embodiment of the present invention is formed into a substantially flat plate as a whole by coextrusion molding a hard resin material and a soft resin material.

That is, the molding body 11 uses, as a hard resin material, an olefinic synthetic resin material, for example, polypropylene (PP) mixed with talc, glass fiber, etc., and shields the mounting recess 1a at the lower end of the door 1. It is formed in a flat plate shape. The upper end portion of the molding body 11 has a lip-shaped upper lip portion 12 extending over the entire longitudinal direction.
The tip of the upper lip 12 is brought into contact with the upper edge of the mounting recess 1a of the door panel 1.

A door panel 1 is provided on the back side of the mall body 11.
A plurality of clips 13 for attachment to the attachment recess 1a are embedded and fixed at intervals. Then, the support protrusion 1 is provided at a position below the clip 13 on the back surface of the molding body 11.
4 is integrally formed of polypropylene as the hard resin material, and its tip is brought into contact with the surface of the mounting recess 1a of the door panel 1 to hold the molding body 11 in a predetermined posture with respect to the mounting recess 1a.

That is, the door lower molding 10 of this embodiment is
The entire molding body 11 is integrally extruded with a hard resin material, and the insert 52 made of stainless steel embedded in the molding body 51 of the conventional example is replaced with a hard resin material and omitted. As the hard resin material forming the molding body 11, a hard resin material other than the above-mentioned olefin resin material can be used as long as it achieves a linear expansion coefficient equivalent to that of stainless steel and satisfies requirements such as strength and shape maintenance. Can be used.

A lower lip portion 15 is continuously and integrally formed on the lower end of the molding main body 11 over the entire longitudinal direction. The lower lip portion 15 has a two-layer structure divided into two parts in the thickness direction, the front surface side is a hard portion 15a made of polypropylene (PP) as a hard resin material similar to the molding body 11, and the back surface side is soft. The soft portion 15b made of a resin material is used. The tip of the soft portion 15b of the lower lip portion 15 constitutes a seal portion that comes into close contact with the outer surface of the rocker molding 2 when the door is closed. As the soft resin material forming the soft portion 15b of the lower lip portion 15, a styrene-based synthetic resin material such as styrene-ethylene-butylene-styrene block copolymer (SEBS) is used. The lower lip 15
As the soft resin material forming the soft part 15b, any soft resin material other than the styrene-based resin material can be used as long as the compression set can be secured to about 50% or more.

As shown in FIG. 2, at the boundary between the molding main body 11 and the base end of the lower lip portion 15, the hard portion 15a is gradually thinned so that the thickness thereof becomes zero at the boundary line. Thus, the base end portion of the soft portion 15b of the lower lip portion 15 constitutes a hinge portion 15c having a substantially triangular cross section shown by a two-dot chain line in the figure. As a result, the soft resin material of the hinge portion 15c of the lower lip portion 15 is exposed in a fine linear shape on the surface of the boundary portion between the molding body 11 and the lower lip portion 15, and the lower portion of the hinge portion 15c is exposed. A boundary line serving as a base point of tilting of the lip portion 15 is configured. Note that, in FIG. 2, for convenience of description, the hinge portion 15c is represented by a substantially triangular cross-section, but in reality, the hinge portion 15c is the base end portion of the soft portion 15b of the lower lip portion 15, that is, the molding body. 11
And the lower lip portion 15 is composed of a soft resin material around the boundary line.

The surface of the molding main body 11 and the surface of the lower lip portion 15 which form the design surface of the door lower molding 10 are coated with a paint for an olefin resin material as a hard resin material, for example, to have the same color as the body color. It has been painted.

In the door lower molding 10 of this embodiment constructed as described above, the back surface of the molding body 11 is provided with the door panel 1.
The clip 13 is fixed along the lower end of the door panel 1 by facing the surface of the mounting recess 1a and inserting the clip 13 into a mounting hole (not shown) formed at a corresponding position of the door panel 1. When the door is closed, the door lower molding 10
The peripheral surface of the front end of the soft portion 15b on the back surface side of the lower lip portion 15 elastically abuts on the outer surface of the rocker molding 2 to ensure the sealing performance with respect to the rocker molding 2 and the door lower molding 10 Door and Rocka Mall 2 as a whole
Shield the gap between and. Furthermore, the door lower molding 10 exerts a unique design effect by coloring the surface of the molding body 11 and the entire surfaces of the upper and lower lip portions 12 and 15 as the design surface.

Further, when the door is closed, in the conventional door lower molding 50, the entire seal lip 55 bends outward to absorb the seal wrap amount, so that the surface of the seal lip 55 changes in shape by the seal wrap amount. , Seal lip 5
Although the coating film on the surface of 5 was affected by the stress, according to the door lower molding 10 of this embodiment, the shape of the hard portion 15a of the lower lip portion 15 made of a hard resin material does not change, and the lower lip portion 15 does not change. Since the lower lip portion 15 tilts outward and absorbs the seal wrap amount via the hinge portion 15c of the soft portion 15b made of a soft resin material integrally formed on the back surface side of the lower lip portion 15, The portion 15a itself is not elastically deformed, and only the entire portion is moved outward via the hinge portion 15c. Therefore, the hard portion 15a of the lower lip portion 15 is
The surface coating is not affected by stress.

As described above, in the door lower molding 10 of the above embodiment, the molding body 11 fixed by the clip 13 along the mounting recess 1a at the lower end of the door panel 1 is formed of an olefin resin material as a hard resin material, and A lower lip portion 15 extending over the entire lower end of the molding body 11 in the longitudinal direction and extending to the outer surface of the rocker molding 2 below the door panel 1 is provided with a hard portion 15a on the front surface side and a soft portion 15b on the back surface side. The hard part 1 has a layered structure
5a is integrally formed of the same hard resin material as that of the molding body 11, and the soft portion 15b is integrally formed of a styrene resin material as a soft resin material. The tip of the soft portion 15b forms a rocker when the door is closed. Mall 2
And a hinge portion 15c which allows the tilting of the hard portion 15a in the thickness direction by the base end portion of the soft portion 15b.

Therefore, in the above embodiment, when the door is closed, the soft portion 15b located on the back surface side of the lower lip portion 15 is formed.
The seal portion at the tip is in close contact with the outer surface of the rocker molding 2 as the body, and exhibits a sealing function. On the other hand, the hard portion 15a of the lower lip portion 15 tilts outward with respect to the molding body 11 via the hinge portion 15c at the base end of the soft portion 15b, and has an overlapping length with the outer surface of the rocker molding 2. Absorbs the amount of seal wrap that is At this time, since the hard portion 15a of the lower lip portion 15 is made of a hard resin material and tilts as a whole, the hard portion 15a is not elastically deformed due to the absorption of the seal wrap amount, and its surface changes in shape. Nothing.

As a result, the hard portion 15 of the lower lip portion 15
a When the surface is painted, the hard part 1 that constitutes the design surface
The surface of 5a is not deformed, such as curved, and the coating film is not cracked, and the appearance quality of the door lower molding 10 is maintained in a good condition. Therefore, even if the surface of the hard portion 15a of the lower lip portion 15 which is the design surface of the door lower molding 10 is coated with the conventional paint, the appearance quality is not impaired, and the entire door lower molding 10 is resinified. There is no need to develop special paints.

Further, the entire door lower molding 10 can be made of resin, and the stainless insert 52 for reinforcing the conventional door lower molding 50 can be omitted, and the weight of the door lower molding 10 as an automobile part can be reduced. Together with the door lower molding 10 which is entirely resin
Can be easily reused as a material by pulverization or the like, and its recyclability can be improved.

Further, as described above, when the hard resin material is the olefin resin material and the soft resin material is the styrene resin material, the material cost can be reduced. However, as described in the above embodiment, it is of course possible to use other resin materials such as using acrylonitrile-butadiene-styrene (ABS) as the hard resin material.

By the way, the door lower molding 1 of the above embodiment
0 is configured as an external type that is fixed to the outside of the door panel 1, but the present invention is not limited to this and is fixed to the lower end of the door and Any material may be used as long as it functions to block the gap with the rocker molding 2. For example, the door lower molding 10 of the present invention can be embodied as a so-called internal type in which the molding body 11 is fixed to the inside of the door panel 1 by a double-sided tape or screws. Also in this case, the hinge portion 15c at the base end of the soft portion 15b of the lip portion 15 hanging from the lower end of the door to the rocker molding 2 absorbs the seal wrap amount and prevents the hard portion 15a of the lip portion 15 from changing its shape. Therefore, the same effect as that of the above-described embodiment can be obtained.

Further, in the above embodiment, the lower lip portion 15
The soft portion 15b is provided on the entire back surface side of the hard portion 15a by a soft resin material, and the hinge portion 15c is formed by the base end portion thereof.
, Which constitutes a seal portion by the tip portion, at least at the hinge portion 15c for connecting the base end of the hard portion 15a to the molding body 11 so as to be tiltable, and the hinge portion 15c which is closely attached to the body side when the door is closed. And a seal portion that exhibits good sealing performance are provided. For example, a hinge portion 15c is provided at the rear surface proximal end of the hard portion 15a, and a seal portion is provided at the rear surface distal end, and the central portion between them is soft. The resin material may be omitted. That is, the seal portion of the above embodiment is constituted by the tip end portion of the soft portion 15b, but at least the lower end rear surface of the lower lip portion 15 which is a portion contacting with the outer side surface of the rocker molding 2 when the door is closed. Any material can be used as long as it is provided in the vicinity and exhibits sealing properties. Further, since the upper lip portion 12 at the upper end of the molding body 11 does not need a sealing function, it is formed of the same hard resin material as that of the molding body 11 in the above embodiment, but this should be replaced with a soft resin material. Of course it is possible.

[0030]

As described above, according to the door lower molding of the present invention, the molding body fixed along the lower end of the door is formed of the hard resin material, and the hard portion made of the hard resin material extending downward is formed on the molding body. Extending in the longitudinal direction, in the longitudinal direction of the boundary portion between the molding body and the hard portion, a hinge portion made of a soft resin material that allows tilting in the thickness direction of the hard portion is extended, A seal portion is integrally formed on the body side of the hard portion when the door is closed. Therefore, when the door is closed, the body-side seal portion of the hard portion is in close contact with the body side to exert a sealing function, and the hard portion tilts in the thickness direction with respect to the molding body via the hinge portion, Absorbs the amount of seal wrap that is the overlap length with the body. At this time, since the hard portion is made of a hard resin material and tilts as a whole, the hard portion is not elastically deformed due to the absorption of the seal wrap amount, and the surface thereof does not change in shape. As a result, when the surface of the hard portion serving as the design surface is coated, the surface of the hard portion is not deformed such as curved, and the coating film is not cracked.

[Brief description of drawings]

FIG. 1 is a sectional view of a door lower molding according to an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part showing a hinge portion of a door lower molding according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional door lower molding.

[Explanation of symbols]

 2 rocker molding 11 molding body 15a hard part 15b soft part (seal part) 15c hinge part

Claims (1)

[Claims] 1. A molding body made of a hard resin material fixed along a lower end of a door, a hard portion made of a hard resin material extending in a longitudinal direction of the molding body and extending downward, and the molding body. A hinge portion made of a soft resin material that extends in the longitudinal direction of the boundary portion with the hard portion and that allows tilting in the thickness direction of the hard portion, and is integrally formed on the body side of the hard portion of the door. A door lower molding, comprising: a seal portion that closely adheres to the body side when closed.