JPH0627444U - Upper body structure of automobile body - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an upper back part structure of an automobile body capable of suppressing generation of vibration and reducing road noise in a vehicle compartment with a simple structure. [Structure] An upper back panel 1 has an open cross section at a front portion thereof, and an upper back surface 6 on which the open cross section is to be formed, a horizontal plane 5 connecting between the rear suspension tower sections 4 on both sides, and an upper back surface 6 And a vertical surface 7 connecting the horizontal surfaces 5. A bracket 9 that forms a rib structure from the rear surface of the upper back surface 6 to the rear surface of the vertical surface 5.
And the bracket 9 is arranged in the central portion of the upper back surface 6. It is possible to increase the surface rigidity of the upper back portion, suppress the occurrence of vibration, and reduce road noise.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of an upper back portion of a vehicle body such as a passenger car.

[0002]

[Prior art]

 As shown in Fig. 4, the vehicle body of a passenger car such as a sedan vehicle is formed by joining a plurality of panel materials. In recent years, however, the structure of the upper back portion of this type of vehicle body has been There is a demand for achieving both weight reduction and high rigidity. 5 and 6 show an example of a structure around a conventional upper back portion. In the drawings, 1 is an upper back panel, 2 is a rear wheel house, 3 is a package tray strainer, and 4 is a rear suspension tower portion. .

The front portion of the upper back panel 1 is formed as a so-called open cross section as shown in FIG. 6, and the rear suspension tower portions 4 on both sides are connected by a horizontal plane 5 and the horizontal plane 5. The upper back surface 6 is connected by a vertical surface 7. This is intended to reduce the weight and increase the rigidity.

[0004]

[Problems to be solved by the device]

 However, in the conventional upper back structure described above, the vibration of the vertical surface 7 becomes remarkable particularly in the range of 150 to 300 Hz, which is a cause of so-called road noise (noise). Therefore, as shown in FIG. 7, an appropriate bead 8 is additionally formed on the vertical surface 7, and the surface rigidity of the vertical surface 7 is increased to suppress the occurrence of vibration, thereby reducing the load noise. A structure is proposed. However, in this case, the structure of the vertical surface 7 becomes complicated and the formability thereof deteriorates despite the demand for weight reduction.

Note that, for example, according to the sound insulation structure for an automobile disclosed in Japanese Utility Model Laid-Open No. 3-100576, a vibration mode different from that of one vehicle body panel (seat back panel) forming the vehicle interior and this vehicle body panel is used. Dynamic dampers are installed at the corners that are connected to other vehicle body panels (rear par shells) that are formed, and each end of this dynamic damper is fixed to both of the above panels, in order to achieve sound insulation. There is. However, in such a sound insulation structure, there is a problem that the device structure including the dynamic damper is complicated.

In view of the above points, the present invention has an object to provide an upper back structure for an automobile body, which has a simple structure and which can suppress the generation of vibrations and effectively reduce road noise in the passenger compartment. To do.

[0007]

[Means for Solving the Problems]

 The upper back structure of an automobile body of the present invention has an open cross section in the front part of the upper back panel, and an upper back surface on which the open cross section is to be formed and a horizontal plane connecting between the rear suspension tower parts on both sides. And a vertical surface connecting the upper back surface and the horizontal surface, and a bracket for forming a rib structure is attached from the back surface of the upper back surface to the back surface of the vertical surface.

In particular, the bracket is arranged at the center of the upper back surface.

[0009]

[Action]

 The upper back structure of the present invention has an open cross-section structure made of a panel material, which can reduce the weight of the body first. Then, by attaching the bracket as described above, the surface rigidity of the upper back surface and the vertical surface is increased and the occurrence of vibration is suppressed. Since the bracket itself has a simple structure, it is possible to reduce the weight without complicating the upper back part, and thereby to effectively and surely reduce the road noise. Further, by arranging the bracket in the central portion of the upper back surface, it is possible to most effectively suppress the occurrence of vibration.

[0010]

【Example】

 An embodiment of the upper back structure of an automobile body of the present invention will be described below with reference to FIGS. 1 to 3 by using the same reference numerals as those of the conventional example. 1 and 2 show the periphery of the upper back portion of the present invention, an open cross section is formed in the front portion of the upper back panel 1. The upper back surface 6 and a horizontal plane 5 connecting the rear suspension tower portions 4 on both sides with each other, and the vertical plane 7 connecting the upper back surface 6 and the horizontal plane 5 are provided.

Further, a bracket 9 is attached to a central portion (center lines C and L) of the upper back portion. The bracket 9 has spot welding margins 9a and 9b formed by bending a part of the bracket 9, and through the spot welding margins 9a and 9b, from the rear surface of the upper back surface 6 to the rear surface of the vertical surface 7. It is fixed by spot welding (indicated by X in the figure). A rib structure is formed in this part. The bracket 9 has a plate thickness of about 0.6 mm and is formed of an extremely thin plate material.

In the upper back part structure of the present invention, by attaching the bracket 9 as described above, it is possible to increase the surface rigidity of the upper back surface 6 and the vertical surface 7 and suppress the occurrence of vibration. Here, FIG. 3 shows the response characteristics of the excitation points when the front and back of the central portion of the vertical surface 7 are excited. As is clear from the figure, compared to the initial conventional example shown by the thick solid line (see FIG. 5) and the conventional example with beads shown by the thin solid line (see FIG. 7), the dotted line According to the present invention shown, the vibration level of the vertical surface 7 is significantly improved. Therefore, the load noise can be reduced by suppressing the occurrence of the vibration in this way.

Further, the bracket 9 is arranged at the central portion of the upper back surface 6, but this arrangement position is the most effective in suppressing the vibration generation as described above. That is, referring to FIG. 1, Comparative Example 1 and Comparative Example 2 are cases where a pair of brackets 9 are attached at positions L ₁ = 100 mm and L ₂ = 180 mm, respectively, which are distributed from the center line C · L to both sides. . The response characteristics of the above-mentioned excitation points in Comparative Example 1 and Comparative Example 2 are shown in FIG. Instead, it was found that one provided at the central portion of the upper back portion was more suitable.

[0014]

[Effect of device]

 As described above, according to the upper body structure of the automobile body of the present invention, by attaching the bracket having a simple structure, it is possible to achieve both the requirements of weight reduction and high rigidity of the body, and it is effective. In addition, the road noise can be surely reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of an upper back structure of an automobile body according to an embodiment of the present invention.

FIG. 2 is a central cross-sectional view of the upper back portion structure of FIG.

FIG. 3 is a diagram showing vibration response characteristics in the upper back portion structure.

FIG. 4 is a perspective view of a conventional automobile body.

5 is an enlarged perspective view of a portion A of FIG. 4 showing a structure of an upper back portion in a conventional automobile body.

FIG. 6 is a partial perspective view of the structure of the upper back portion of a conventional automobile body.

FIG. 7 is a partial perspective view of another upper back structure of a conventional automobile body.

[Explanation of symbols]

 1 Upper back panel 4 Rear suspension tower section 5 Horizontal surface 6 Upper back surface 7 Vertical surface 9 Bracket

Claims (2)

[Scope of utility model registration request] 1. An upper back panel having an open cross section at a front portion thereof, the upper back surface on which the open cross section is to be formed, a horizontal plane connecting between the rear suspension tower parts on both sides, the upper back surface and the above. In the upper back structure of an automobile body including a vertical surface connecting horizontal surfaces, a bracket for forming a rib structure is attached to a rear surface of the upper back surface to a rear surface of the vertical surface, which is characterized in that Upper back structure. 2. The upper back part structure for an automobile body according to claim 1, wherein the bracket is disposed at a central portion of the upper back surface.