JPH0891149A - Resin-molded rear bumper - Google Patents

Abstract

PURPOSE: To prevent the entrance of exhaust gas to the inside of a rear bumper by integrally molding a rib having a shape running along the peripheral edge of a notch part on the reverse side of a rear bumper body, and forming a shrink preventive groove part in a place corresponding to the rib among a surface of the rear bumper body. CONSTITUTION: A notch part 6 where a part corresponding to a muffler 4 is cut in an almost circular arc shape is formed on a rear bumper body 1a of a rear bumper 1. A rib 7 projecting toward the reverse side of the rear bumper 1 from a place running along the peripheral edge of the notch part 6 is integrally formed. When the rear bumper 1 having integrally the rib 7 is molded by resin, a shrink preventive groove part 8 extending along a surface place is formed in this surface place of the rear bumper 1 corresponding to the rib 7 so that shrink is not caused. Therefore, the entrance of exhaust gas to the inside of the rear bumper 1 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin-molded rear bumper arranged in the rear part of an automobile, and more specifically, a notch formed by cutting a portion corresponding to a muffler in a resin-made rear bumper body mounted in the rear part of a vehicle body. The present invention relates to a resin-molded rear bumper having a portion.

[0002]

2. Description of the Related Art The length of a vehicle body (length in the longitudinal direction of the vehicle body) is set variously depending on the type of vehicle.
In order to prevent the exhaust gas discharged from the muffler from entering the inside of the rear bumper, it is necessary to arrange the exhaust gas discharge port of the muffler on the rear side of the rear bumper. Therefore, conventionally, regarding the positional relationship between the rear bumper and the muffler,
The actual situation is that the rear bumper is aligned with the position where the muffler is arranged, or the muffler is aligned with the position of the rear bumper.

FIGS. 4 and 5 show the positional relationship between the rear bumper 20 and the muffler 21 which have been conventionally used. Specifically, FIG. 4 shows a case where the rear bumper 20 is aligned with the disposition position of the muffler 21, and in this case, the lower front edge of the rear bumper 20 is located on the front side of the vehicle body (the inside of the rear bumper 20). ) Is integrally molded, and the lower end 22a of the bent piece 22 is formed.
Is arranged on the front side of the vehicle body from the exhaust gas discharge port 21a at the tip of the muffler 21.

Further, in FIG. 5, the muffler 21 is replaced with the rear bumper 20.
In this case, the long muffler 21 is newly designed or the muffler cutter is used to form the long muffler 21.

[0005]

However, the conventional arrangement structure as described above has the following problems. That is, as shown in FIG. 4, the rear bumper 20 is attached to the muffler 21.
However, there is a problem in that the external shape of the rear bumper 20 is restricted when the rear bumper 20 is aligned with the arrangement position. Further, as shown in FIG. 5, when the muffler 21 is aligned with the arrangement position of the rear bumper 20, a new muffler or muffler cutter or the like is required, which causes a problem of cost increase.

The present invention has been made to solve such a problem, and an object thereof is to discharge the muffler from the muffler even if the position where the resin-molded rear bumper is arranged with respect to the muffler is changed according to the vehicle type. The exhaust gas can be guided to the rear side of the resin-molded rear bumper to prevent the exhaust gas from entering the inside of the resin-molded rear bumper, and a rib that prevents the entry of exhaust gas is integrated on the back side of the resin-molded rear bumper. Another object of the present invention is to provide a resin-molded rear bumper that can prevent sink marks from being formed on the surface of the resin-molded rear bumper.

[0007]

In order to achieve the above object, according to the present invention, a resin-made rear bumper having a notch formed by cutting a portion corresponding to a muffler in a resin-made rear bumper body attached to a rear portion of a vehicle body. In the above, a rib having a shape along the peripheral edge of the cutout portion is integrally formed on the rear surface side of the rear bumper body, and a sink preventing groove portion is formed on a portion of the surface of the rear bumper body corresponding to the rib. ing.

[0008]

Even if the rear bumper body is arranged rearward of the exhaust gas discharge port of the muffler in a vehicle body with a long body, the exhaust gas exhausted from the muffler due to the existence of the rib integrally formed on the back side of the rear bumper body. Gas is prevented from entering the inside of the rear bumper and is guided behind it.
Further, due to the presence of the groove for preventing sink marks on the surface portion of the rear bumper body corresponding to the ribs, it is possible to avoid a situation in which sink marks are generated during resin molding and the appearance is impaired.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a resin-molded rear bumper 1 according to the present invention.
The four-wheeled vehicle 2 of this example is a vehicle type in which the length of the vehicle body 3 is relatively long. The muffler 4 used in the four-wheeled vehicle 2 is a general-purpose type that is commonly used in various vehicle bodies and is attached to the tip of the exhaust pipe 5 (see FIG. 2) and attached to the rear portion of the vehicle body 3. The resin-molded rear bumper 1 is disposed below the resin-molded rear bumper 1.

On the other hand, the above-mentioned resin-molded rear bumper 1 is made of a resin-integrally molded product, and has a rear bumper body 1a having a notch 6 formed by cutting a portion corresponding to the muffler 4 into a substantially arc shape. There is. Then, as shown in FIGS. 2 and 3, on the rear surface side of the resin-molded rear bumper 1, the rear surface side (the front side of the vehicle body) from the portion along the peripheral edge of the cutout 6 is formed.
A rib 7 that projects toward is formed integrally. In addition,
As shown in FIG. 3, the upper portion of the rib 7 having a shape along the peripheral edge of the cutout portion 6 is slightly inclined downward from the rear side of the vehicle body toward the front side of the vehicle body when the resin molded rear bumper 1 is attached. There is.

Further, in this embodiment, when the resin-molded rear bumper 1 integrally having the rib 7 is resin-molded, the surface portion of the resin-molded rear bumper 1 corresponding to the rib 7 is formed so as not to sink. A groove 8 for preventing sink marks extending along is formed (see FIG. 3).

Thus, the resin-molded rear bumper 1 and the muffler 4 are arranged in the following arrangement relationship. That is, since the four-wheeled vehicle 2 is a vehicle model in which the length of the vehicle body 3 is relatively long, the rear bumper body 1a is arranged rearward of the exhaust gas discharge port 4a of the muffler 4 as shown in FIG. A portion of the muffler 4 on the side of the exhaust gas discharge port 4a is arranged below the rib 7 of the resin-molded rear bumper 1.

According to the resin-molded rear bumper 1 having such a structure, even when the rear bumper body 1a is arranged behind the exhaust gas discharge port 4a of the muffler 4, the exhaust gas is discharged inside the resin-molded rear bumper 1 ( It is prevented from entering the lower side of the vehicle body 3. That is, the exhaust gas discharged from the exhaust gas discharge port 4a of the muffler 4 is discharged to the back side of the rear bumper main body 1a at a lower position, but the exhaust gas that tries to go around inside the rear bumper main body 1a is resin. The ribs 7 of the molded rear bumper 1 prevent the inward wraparound, and all the exhaust gas is guided to the outside and discharged.

Further, according to the present embodiment, as described above, since the sink mark preventing groove portion 8 is provided on the surface of the resin-molded rear bumper 1, the sink mark which becomes a problem when integrally molding the rib 7 causes the resin to sink. It is possible to avoid the occurrence of a defect that impairs the appearance of the molded rear bumper 1.

Further, according to this embodiment, it is not necessary to align the resin-molded rear bumper 1 with the arrangement position of the muffler 4, so that
There is no restriction on the molding shape of the resin-molded rear bumper 1, and in that respect as well, the appearance of the resin-molded rear bumper 1 is not impaired. Further, since it is not necessary to align the muffler 4 with the position where the resin-molded rear bumper 1 is arranged, there is no increase in cost.

The embodiment of the present invention has been described above.
The present invention is not limited to this embodiment, and various modifications and changes can be made based on the technical idea of the present invention. For example, the shapes of the cutout portion 6 and the rib 7 of the resin-molded rear bumper 1 can be variously changed as necessary.

[0018]

As described above, according to the present invention, a rib having a shape along the peripheral edge of the cutout portion for arranging the muffler is integrally formed on the back side of the rear bumper body, and the rib is formed on the front surface of the rear bumper body. Since the groove for preventing sink marks is formed at the corresponding portion, the rib can prevent the exhaust gas discharged from the muffler from entering the inside of the rear bumper body, and the groove can be formed. By forming the above, it is possible to prevent the occurrence of sink marks that impair the appearance of the rear bumper body during resin molding.

Further, even if the resin-molded rear bumper is disposed on the rear side of the vehicle body with respect to the muffler according to the vehicle type,
Since it is not necessary to align the resin-molded rear bumper with the muffler position, there is no restriction on the shape of the resin-molded rear bumper and the external appearance is not impaired.Moreover, there is no need to align the muffler with the resin-molded rear bumper installation position, thus increasing costs There is no invitation.

[Brief description of drawings]

FIG. 1 is a perspective view of a four-wheeled vehicle equipped with a resin-molded rear bumper according to the present invention.

FIG. 2 is a perspective view showing a positional relationship between a resin-molded rear bumper and a muffler according to the present invention, and is a perspective view of a portion indicated by reference numeral X in FIG. 1 from the back side.

3 is a cross-sectional view taken along the line AA in FIG.

FIG. 4 is a cross-sectional view showing a positional relationship between a conventional resin-molded rear bumper and a muffler.

5 is a cross-sectional view showing a positional relationship between a conventional resin-molded rear bumper and a muffler, which is different from FIG.

[Explanation of symbols]

 1 Resin-molded rear bumper 1a Rear bumper body 2 Four-wheeled vehicle 3 Body 4 Muffler 5 Exhaust pipe 6 Notch 6a Peripheral edge 7 Rib 8 Groove

Claims (1)

[Claims] 1. A resin-molded rear bumper having a cutout portion formed by cutting a portion corresponding to a muffler in a resin-made rear bumper body attached to a rear portion of a vehicle body, the rear side of the rear bumper body being along a peripheral edge of the cutout portion. A resin-molded rear bumper, characterized in that a shaped rib is integrally molded, and a sink preventing groove is formed in a portion of the surface of the rear bumper body corresponding to the rib.