JPS6311182B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile bumper comprising an automobile bumper body and a molding attached to the automobile bumper body.

Conventionally, in automobile bumpers, a molding with a shiny surface, etc. is attached to a bumper or soft bumper (hereinafter referred to as the bumper body) made of synthetic resin, synthetic rubber, etc., in order to attach the molding to the bumper body. Two different structures are adopted.

First, as shown in FIGS. 1 to 3, a recess for attaching the molding 2 is formed at a predetermined location on the bumper body 1, and an undercut boss 3 is formed on the back side of the molding 2. is inserted into the locking hole in the recess.

The second method is to attach double-sided adhesive tape 5 to the back side of the molding 4, as shown in FIGS. 1, 4, and 5.
The structure is such that the release paper is peeled off and the sticker is attached to the bumper body. For example, see Utility Model Application No. 50-98646.

A disadvantage of the first structure is that the undercut boss is used, which complicates the mold structure.
Furthermore, strict dimensional accuracy of the boss and the hole on the bumper body side is required, making it difficult to control the molding conditions of the bumper body and molding.

Therefore, the first structure has drawbacks such as high cost and increased defect rate. Further, when the first structure is adopted, it is impossible to absorb expansion and contraction of the molding due to changes in temperature (+80°C to -40°C). If the temperature changes from room temperature (20℃) to 80℃, the pitch of boss 3 will change to 100mm as shown in Figure 6.
In this case, since the coefficient of thermal expansion of the molding 2 is about 10×10 ⁻⁵ , the molding will be deformed by about 5 mm at the center, impairing the quality of its appearance.

Next, the disadvantage of the second structure is that the molding cannot expand or contract when a temperature change occurs as described above. Therefore, shear stress is generated in the adhesive tape portion, causing the adhesive surface to peel off.

Furthermore, when attaching the molding to the bumper body using adhesive tape, special jigs, rollers, etc. are required to apply appropriate pressure. Furthermore, bumper bodies made of polypropylene have the disadvantage that they cannot be bonded.

An object of the present invention is to provide a bumper that does not have the above-mentioned drawbacks. According to the bumper of the present invention, it is possible to absorb variations in dimensional accuracy and also to absorb expansion and contraction due to temperature. Furthermore, it is possible to attach the molding to a bumper body made of a material that cannot be bonded, such as polypropylene.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. As shown in FIGS. 7 to 10, the bumper includes a bumper body 10 made of a non-metallic material such as synthetic resin or synthetic rubber, which is fixed to the car body 9 of the automobile via a bumper stay (not shown), and a bumper body 10 made of non-metallic material such as synthetic resin or synthetic rubber. It is provided with a molding 11 made of a band-shaped elastic body to be attached.

Here, in this embodiment, the bumper body 1
The figure shows a structure in which the molding 11 is vertically attached to the main plate part extending in the vehicle width direction of the bumper body 10, so a vertical molding receiving recess 15 is installed on the vertical wall surface of the main plate part of the bumper body 10 that is exposed to the outside of the vehicle. 10 is bulged toward the back side. Receiving holes 16 are vertically formed in the upper and lower walls of the molding receiving recess 15, which face each other in the longitudinal direction, through which both ends of the molding 11 are inserted. These 2
The two receiving holes 16 are defined by the back side of the bumper body 10, a side wall and a back wall 18 that face each other in the lateral direction of the molding receiving recess 15. On the other hand, the molding 11 has a bright surface 13 on the surface of a molding body 12 made of a band-shaped elastic body. A protrusion 14 that can abut against the periphery of the receiving hole 16 of the bumper body 10 is provided at each of the portions of the molding 11 that protrude from the receiving hole 16 toward the back side of the bumper body 10 at both ends in the longitudinal direction.
Specifically, these two protrusions 14 are integrally formed on the back side of the bumper body 12 with the same material as the molding body 12, and are formed integrally with the molding body 11.
When viewed from the side along the longitudinal direction, it has a tapered approximately triangular shape. Molding body 12 of protrusion 14
The rising surface from the back becomes a locking jaw 17. The opposing dimensions of these locking jaws 17 are set larger than the dimension between the end faces in the longitudinal direction of the back wall 18.
As shown in Figure 8, the molding 11 is attached to the bumper body 1.
0, the locking jaw 17 is attached to the back wall 1.
A required gap a is interposed between the longitudinal end face of 8 and the end face of 8 in the longitudinal direction. Further, the width of the short side of the molding 11 is slightly narrower than the width of the short side of the molding receiving recess 15.

According to the above embodiment structure, the molding 11 can be bent in an arc shape and both longitudinal ends thereof can be inserted into the receiving hole 16 at the same time, or one end can be inserted into the receiving hole 16 one after another. , as shown in FIG.
The molding 11 is attached to the bumper body 10 by inserting it into the receiving hole 16. In this case, since the protrusion 14 is made of the same element as the molding body 12 and has elasticity, it passes through the receiving hole 16 in a collapsed state. Then, as shown in FIG. 8, the mall 11
When it is attached to the bumper body 10, the locking jaw 1 of the protrusion 14 is moved up and down by the molding 11.
7 comes into contact with the periphery of the receiving hole 16 of the bumper body 10, specifically, with both longitudinal end surfaces of the back wall 18, thereby preventing the molding 11 from falling off. Moreover, a gap a is provided between the locking jaw 17 of the protrusion 14 and both longitudinal end surfaces of the back wall 18, and
Since the width of the short side of the molding 11 is made slightly narrower than the width of the short side of the molding receiving recess 15, it is possible to absorb expansion and contraction due to temperature changes or variations in dimensions within the manufacturing tolerances of the bumper body 10 and the molding 11. In addition, the molding 11 can be easily attached.

In the above embodiment, the molding 11 is replaced by the bumper body 10.
Although the structure in which the bumper body 10 is vertically attached to the main plate part has been illustrated and explained, as shown in FIG. The present invention can also be applied to a structure in which a molding 19 made of a band-shaped elastic body is attached in a horizontally elongated manner to a corner portion of the present invention. That is, in the bumper body 10 shown in FIG. is formed into a substantially L-shape along the corner portion of the bumper body 10, and a peripheral edge of the receiving hole 16 of the bumper body 10 is formed on each back side of the portion of the molding 19 that protrudes from the receiving hole 16 to the back side of the bumper main body 10 at both ends in the longitudinal direction. protrusion 14 that can come into contact with
is provided.

In some cases, as shown in FIG. 12, protrusions 21 may be provided on both ends in the lateral direction at the portions that protrude from the receiving holes 16 of the moldings 20 vertically attached to the bumper body 10 to the rear side of the bumper body 10. , or as shown in FIG.
Even if projections 21 are provided on both sides of the bumper body 10 in the lateral direction at portions that project toward the rear side of the bumper main body 10, the same effect as in the embodiment described above can be obtained.

Further, although not shown in the drawings, the present invention can be applied to structures in which the molding is installed horizontally on the main plate or side plate of the bumper body, or in which the molding is installed vertically on the corner or side plate of the bumper body. .

As described above, according to the present invention, since the projections are provided at both longitudinal ends of the molding made of a band-shaped elastic body and protruding from the receiving hole toward the rear side of the bumper body, the molding can be easily bent and the assembly can be easily carried out. In addition to being easy to work with, the bumper body only needs to have two holes to accommodate the molding, so there is less possibility of adversely affecting the flow of molding material during bumper body molding, and the appearance quality of the bumper body is maintained in good condition. Furthermore, when the molding is attached to the bumper body, a predetermined distance can be interposed between the protrusion and the periphery of the receiving hole in the bumper body, so that the molding and the bumper body can be manufactured within the tolerances. It is possible to absorb variations in dimensions between the two or expansion and contraction due to heat. Further, even if a sink mark occurs during molding in the portion where the protrusion portion of the molding is provided, this sink mark is covered by the bumper body by attaching the molding to the bumper body, so that the appearance quality of the molding can be ensured. In addition, when installing the molding, you can bend the molding and insert both longitudinal ends into the receiving hole at the same time, or you can insert one end at a time into the receiving hole in turn; no special tools are required. Assembling work is easy because there is no need to do so. Furthermore, there are novel effects such as the ability to prevent the molding from falling off even if a bumper body to which adhesive is not effective is used.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional bumper consisting of a bumper body and a molding, Figure 2 is a detailed perspective view of the molding in Figure 1, Figure 3 is a sectional view taken along the line - - in Figure 1, and Figure 4 is a FIG. 5 is a sectional view taken along the line - - of FIG. 1, FIG. 6 is a sectional view taken along the line - - of FIG. 1, and FIG. 7 shows the bumper body and molding of the present invention. A perspective view of an embodiment of a bumper;
Figure 8 is a sectional view taken along the - line in Figure 7, and Figure 9 is a cross-sectional view of Figure 8.
Figure 10 is a perspective view of the molding and bumper body before being combined;
Figures 1 to 13 show different examples of the present invention, in which Figure 11 is a sectional view taken along the line XI-XI shown in Figure 7, and Figure 12 is a view after the molding is attached to the bumper body. A perspective view, FIG. 13 is a perspective view of the molding. 10... Bumper body, 11, 19, 20, 2
2...Mall, 14, 21...Protrusion, 16...
Receiving hole.

Claims (1)

[Claims] 1.Equipped with a non-metallic bumper body fixed to the vehicle body and a molding made of a band-shaped elastic body attached to the bumper body, and the bumper body is provided with receiving holes through which both longitudinal ends of the molding are inserted. On the other hand, the bumper is characterized in that a protrusion that can come into contact with the periphery of the receiving hole of the bumper body is provided on each of the portions of the molding that protrude from the receiving hole toward the rear side of the bumper main body at both longitudinal ends of the molding.