JPH0356122Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a synthetic resin molding with an insert buried therein, and in particular to a reinforcing structure for a synthetic resin molding in which the insert is buried so that a part of its back surface is exposed. It is. Such synthetic resin moldings are used, for example, in side moldings for automobile bodies, which are subjected to bending work.

[Prior Art] FIG. 4 is a partial back view showing a conventional side molding for an automobile body, and FIG. 5 is a sectional view taken along the line BB in FIG. 4.

In the figure, polyvinyl chloride (PVC)
Resin part 1 made of acrylonitrile-butadiene-styrene terpolymer (ABS), etc.
and an insert 2 which is buried so as to line the back surface of the resin part 1 and has a part of the back surface exposed.
Consisting of In order to obtain a desired strength with a predetermined thickness, the insert 2 has a plate-like structure in which a portion thereof is curved as shown in the figure.

The resin part 1 is a central part 1a in the width direction (short axis direction)
The surface is raised one step higher, and the surface is decorated with uneven three-dimensional or two-dimensional decoration. Resin part 1
When viewed from the front, both sides 1b of the insert 2 are lower than the center portion 1a, and the back side wraps around the sides 2a of the insert 2, which are also lowered.

This side molding has a transparent resin layer in the central part 1a of the surface of the resin part 1 due to design requirements, and when it has a bent part in the longitudinal direction, a flat side molding with a transparent resin layer on the surface is created. Then, the bent portion is formed by press bending or the like, so that it conforms to the curved surface of the automobile body.

This type of side molding for an automobile body is attached to the automobile body via an attachment seat and an attachment piece (none of which are shown) provided on the insert 2.

[Problems to be solved by the invention] However, when such a side molding for an automobile body is subjected to a heat cycle of high and low temperatures in the usage environment, the coefficient of linear expansion of the resin part 1 and the insert 2 decreases. As a result, the resin portion 1 and the insert 2 tend to be easily separated from each other because they are repeatedly subjected to shear stress due to the difference.

When the side molding is manufactured through press bending as described above, during this press bending, the elastic modulus of the insert 2 is lower than that of the resin part 1.
Because the bending deformation is significantly larger, the neutral plane of the bending deformation moves closer to the insert 2, and as a result, the amount of deformation of the surface portion of the resin part 1 becomes larger, or the both sides 1b of the resin part 1 located at the bending part The side molding tends to bulge outward, making the appearance of the side molding unsightly.
and peel off easily.

On the other hand, if almost the entire front and back surfaces of the insert 2 are molded to form the resin part 1, as in the technique published in Japanese Utility Model Publication No. 58-23725, when the resin part 1 is bent for attachment to an automobile body, the resin part 1 and insert 2
The restoring force increases due to the internal stress. Also,
When subjected to repeated heat cycles of high and low temperatures, resin portion 1 and insert 2 tend to separate from each other due to shear stress in resin portion 1 and insert 2. Then, there is a possibility that it will partially peel off and the appearance will be deformed. Furthermore, the volume of the resin part increases, and the weight increases accordingly, resulting in wasted resources.

In addition, if a synthetic resin bumper for an automobile is entirely injection molded as in the technology disclosed in Japanese Utility Model Publication No. 58-23729, it will be placed away from the vehicle body and undergo repeated heat cycles of high and low temperatures under the usage environment. Even when exposed to heat, the shear stress due to the difference in linear expansion coefficient between the resin part and the insert is small and does not affect the external appearance, so structural measures such as providing ribs on the inside of synthetic resin bumpers for automobiles This makes it possible to restrain changes in the overall shape due to heat cycles. However, even when this technology was applied to relatively thin side moldings for automobile bodies, it was structurally difficult.

Therefore, this invention provides a side molding for an automobile body in which the resin part and the insert do not separate even when used for a long time, and also do not cause deformation of the appearance or peeling of the resin part and the insert during bending. This is the issue.

[Means for Solving the Problems] The side molding for an automobile body according to this invention has an insert buried so that a part of the back surface of the side molding is exposed. The insert is surrounded by reinforcing ribs that connect both sides in the direction.

[Function] By doing this, the adhesion between the resin part and the insert becomes stronger, making it difficult to peel off, and even if it does peel off, the reinforcing ribs hold the insert, so the resin part and the insert cannot be separated. It is held together inseparably and can be used even under severe temperature conditions or as an ornament for automobiles that requires complicated bending.

[Example] Hereinafter, an example of the side molding for an automobile body of this invention will be described based on the drawings.

Fig. 1 is a partial back view showing an embodiment of the side molding for an automobile body according to the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig.
FIG. 3 is a cross-sectional view taken along the line AA in the figure, and a perspective view of the back side showing an embodiment of the side molding for an automobile body according to the present invention.

This side molding for an automobile body is a long piece with a constant width. Its cross-sectional structure is approximately the same as that of the conventional side molding shown in FIG. That is, the central portion 1a of the resin portion 1 is raised and protrudes, and its surface is decorated. Similarly, a metal insert 2 with a raised central portion is buried in the back surface of the resin part 1 with the back surface exposed, and the both sides 2a of the insert 2 are buried in the both sides 1b of the resin part 1. It is embedded up to. The reinforcing ribs 3 are rib-like parts with a constant width that connect the sides 1b of the back surface of the resin part 1 and wrap around the back surface of the insert 2. In this embodiment, the width is 5 mm, and the distance between adjacent reinforcing ribs 3 is
It is 10mm. These specifications are determined by the cross-sectional shape and overall shape of the side molding, the radius of bending, the application site, the material of the resin part 1, and the usage environment. In the region where the reinforcing rib 3 connects both sides 1b of the resin part 1, the insert 2 is completely embedded in the resin part 1 and the reinforcing rib 3, as shown in FIGS. 2 and 3.

This side molding is integrally molded with the insert 2 by injection molding of PVC, ABS, or other resin.

When this type of side molding for an automobile body has a transparent resin layer on the surface of the central portion 1a of the resin portion 1 and has a bent portion in the longitudinal direction,
As described in the prior art, the bent portion can be formed by press bending. At this time, the spacing and width of the reinforcing ribs 3 may be determined depending on the radius of bending of the bent portion of the resin portion 1, the cross-sectional shape, the overall shape, the application site, the material of the resin portion 1, and the usage environment.

In particular, in the embodiment of the present invention, on the back side where the insert 2 is exposed, both sides of the resin part 1 in which the insert 2 is embedded are arranged so as to be approximately perpendicular to the length direction of the insert 2 and the resin part 1. direction, i.e.
Since the reinforcing ribs 3 enclosing a part of the insert 2 are connected in a substantially vertical direction and have a predetermined pitch between them, the reinforcing ribs 3 restrain bending in the longitudinal direction. There's nothing to do.

In the side molding for an automobile body configured as described above, the insert 2 is completely buried in the side molding in the part where the reinforcing rib 3 is provided, and the contact between the resin part 1 and the insert 2 is caused by temperature changes. Shear stress generated at the boundary also makes it difficult to peel off. Further, even if the resin part 1 and the insert 2 are peeled off, there is no danger that the resin part 1 and the insert 2 will be separated. In addition, even if press bending is required, the reinforcing ribs 3 work to prevent deformation at the bending part of the resin part 1, reduce deformation of the surface of the resin part 1, and prevent peeling between the resin part 1 and the insert 2. can be prevented.

[Effects of the invention] As explained above, when the side molding for an automobile body of this invention is attached to the surface of the automobile body, the inserts are embedded to connect the longitudinal sides of the side molding for the automobile body. Moreover, by providing a reinforcing rib that embraces a part of the insert, the integrity of the resin part and the insert is improved and peeling is prevented even when the temperature changes in the usage environment or during press bending during deformation. It can be prevented. Furthermore, since the reinforcing ribs partially embrace the insert, the appearance of the side molding for an automobile body does not become unsightly even with repeated environmental temperature changes. In addition, since the entire back surface of the synthetic resin molding is not buried in synthetic resin, even if the integrity of the resin part and the insert is improved as described above and the bending strength line etc. is strengthened, the weight will not increase much. It is very resource-saving.

[Brief explanation of the drawing]

Fig. 1 is a partial back view showing an embodiment of the side molding for an automobile body of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, and Fig. 3 is a partial back view showing an embodiment of the side molding for an automobile body of the invention. FIG. 4 is a partial back view showing a conventional side molding for an automobile body, and FIG.
It is a sectional view taken along the line BB in the figure. In the figure, 1...Resin part, 1a...Central part of resin part, 1b...Both sides of resin part, 2...Insert, 2a...Both sides of insert, 3...Reinforcement rib. In addition, in the figures, the same reference numerals and symbols indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] Consisting of an insert and a resin part buried so that a part of the back surface of the insert is exposed, it can be bent freely in the length direction of the insert and the resin part and is attached to the surface of an automobile body. In the side molding for an automobile body, both sides of the resin part in which the insert is embedded are connected in a direction substantially perpendicular to the length direction on the back surface side where the insert is exposed, and a part of the insert is A side molding for an automobile body characterized by being provided with reinforcing ribs that embrace the body.